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1// SPDX-License-Identifier: GPL-2.0+
2/*****************************************************************************/
3
4/*
5 * devio.c -- User space communication with USB devices.
6 *
7 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
8 *
9 * This file implements the usbfs/x/y files, where
10 * x is the bus number and y the device number.
11 *
12 * It allows user space programs/"drivers" to communicate directly
13 * with USB devices without intervening kernel driver.
14 *
15 * Revision history
16 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
17 * 04.01.2000 0.2 Turned into its own filesystem
18 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
19 * (CAN-2005-3055)
20 */
21
22/*****************************************************************************/
23
24#include <linux/fs.h>
25#include <linux/mm.h>
26#include <linux/sched/signal.h>
27#include <linux/slab.h>
28#include <linux/signal.h>
29#include <linux/poll.h>
30#include <linux/module.h>
31#include <linux/string.h>
32#include <linux/usb.h>
33#include <linux/usbdevice_fs.h>
34#include <linux/usb/hcd.h> /* for usbcore internals */
35#include <linux/usb/quirks.h>
36#include <linux/cdev.h>
37#include <linux/notifier.h>
38#include <linux/security.h>
39#include <linux/user_namespace.h>
40#include <linux/scatterlist.h>
41#include <linux/uaccess.h>
42#include <linux/dma-mapping.h>
43#include <asm/byteorder.h>
44#include <linux/moduleparam.h>
45
46#include "usb.h"
47
48#ifdef CONFIG_PM
49#define MAYBE_CAP_SUSPEND USBDEVFS_CAP_SUSPEND
50#else
51#define MAYBE_CAP_SUSPEND 0
52#endif
53
54#define USB_MAXBUS 64
55#define USB_DEVICE_MAX (USB_MAXBUS * 128)
56#define USB_SG_SIZE 16384 /* split-size for large txs */
57
58/* Mutual exclusion for ps->list in resume vs. release and remove */
59static DEFINE_MUTEX(usbfs_mutex);
60
61struct usb_dev_state {
62 struct list_head list; /* state list */
63 struct usb_device *dev;
64 struct file *file;
65 spinlock_t lock; /* protects the async urb lists */
66 struct list_head async_pending;
67 struct list_head async_completed;
68 struct list_head memory_list;
69 wait_queue_head_t wait; /* wake up if a request completed */
70 wait_queue_head_t wait_for_resume; /* wake up upon runtime resume */
71 unsigned int discsignr;
72 struct pid *disc_pid;
73 const struct cred *cred;
74 sigval_t disccontext;
75 unsigned long ifclaimed;
76 u32 disabled_bulk_eps;
77 unsigned long interface_allowed_mask;
78 int not_yet_resumed;
79 bool suspend_allowed;
80 bool privileges_dropped;
81};
82
83struct usb_memory {
84 struct list_head memlist;
85 int vma_use_count;
86 int urb_use_count;
87 u32 size;
88 void *mem;
89 dma_addr_t dma_handle;
90 unsigned long vm_start;
91 struct usb_dev_state *ps;
92};
93
94struct async {
95 struct list_head asynclist;
96 struct usb_dev_state *ps;
97 struct pid *pid;
98 const struct cred *cred;
99 unsigned int signr;
100 unsigned int ifnum;
101 void __user *userbuffer;
102 void __user *userurb;
103 sigval_t userurb_sigval;
104 struct urb *urb;
105 struct usb_memory *usbm;
106 unsigned int mem_usage;
107 int status;
108 u8 bulk_addr;
109 u8 bulk_status;
110};
111
112static bool usbfs_snoop;
113module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
114MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
115
116static unsigned usbfs_snoop_max = 65536;
117module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
118MODULE_PARM_DESC(usbfs_snoop_max,
119 "maximum number of bytes to print while snooping");
120
121#define snoop(dev, format, arg...) \
122 do { \
123 if (usbfs_snoop) \
124 dev_info(dev, format, ## arg); \
125 } while (0)
126
127enum snoop_when {
128 SUBMIT, COMPLETE
129};
130
131#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
132
133/* Limit on the total amount of memory we can allocate for transfers */
134static u32 usbfs_memory_mb = 16;
135module_param(usbfs_memory_mb, uint, 0644);
136MODULE_PARM_DESC(usbfs_memory_mb,
137 "maximum MB allowed for usbfs buffers (0 = no limit)");
138
139/* Hard limit, necessary to avoid arithmetic overflow */
140#define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
141
142static DEFINE_SPINLOCK(usbfs_memory_usage_lock);
143static u64 usbfs_memory_usage; /* Total memory currently allocated */
144
145/* Check whether it's okay to allocate more memory for a transfer */
146static int usbfs_increase_memory_usage(u64 amount)
147{
148 u64 lim, total_mem;
149 unsigned long flags;
150 int ret;
151
152 lim = READ_ONCE(usbfs_memory_mb);
153 lim <<= 20;
154
155 ret = 0;
156 spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
157 total_mem = usbfs_memory_usage + amount;
158 if (lim > 0 && total_mem > lim)
159 ret = -ENOMEM;
160 else
161 usbfs_memory_usage = total_mem;
162 spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
163
164 return ret;
165}
166
167/* Memory for a transfer is being deallocated */
168static void usbfs_decrease_memory_usage(u64 amount)
169{
170 unsigned long flags;
171
172 spin_lock_irqsave(&usbfs_memory_usage_lock, flags);
173 if (amount > usbfs_memory_usage)
174 usbfs_memory_usage = 0;
175 else
176 usbfs_memory_usage -= amount;
177 spin_unlock_irqrestore(&usbfs_memory_usage_lock, flags);
178}
179
180static int connected(struct usb_dev_state *ps)
181{
182 return (!list_empty(&ps->list) &&
183 ps->dev->state != USB_STATE_NOTATTACHED);
184}
185
186static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
187{
188 struct usb_dev_state *ps = usbm->ps;
189 struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
190 unsigned long flags;
191
192 spin_lock_irqsave(&ps->lock, flags);
193 --*count;
194 if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
195 list_del(&usbm->memlist);
196 spin_unlock_irqrestore(&ps->lock, flags);
197
198 hcd_buffer_free_pages(hcd, usbm->size,
199 usbm->mem, usbm->dma_handle);
200 usbfs_decrease_memory_usage(
201 usbm->size + sizeof(struct usb_memory));
202 kfree(usbm);
203 } else {
204 spin_unlock_irqrestore(&ps->lock, flags);
205 }
206}
207
208static void usbdev_vm_open(struct vm_area_struct *vma)
209{
210 struct usb_memory *usbm = vma->vm_private_data;
211 unsigned long flags;
212
213 spin_lock_irqsave(&usbm->ps->lock, flags);
214 ++usbm->vma_use_count;
215 spin_unlock_irqrestore(&usbm->ps->lock, flags);
216}
217
218static void usbdev_vm_close(struct vm_area_struct *vma)
219{
220 struct usb_memory *usbm = vma->vm_private_data;
221
222 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
223}
224
225static const struct vm_operations_struct usbdev_vm_ops = {
226 .open = usbdev_vm_open,
227 .close = usbdev_vm_close
228};
229
230static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
231{
232 struct usb_memory *usbm = NULL;
233 struct usb_dev_state *ps = file->private_data;
234 struct usb_hcd *hcd = bus_to_hcd(ps->dev->bus);
235 size_t size = vma->vm_end - vma->vm_start;
236 void *mem;
237 unsigned long flags;
238 dma_addr_t dma_handle = DMA_MAPPING_ERROR;
239 int ret;
240
241 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
242 if (ret)
243 goto error;
244
245 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
246 if (!usbm) {
247 ret = -ENOMEM;
248 goto error_decrease_mem;
249 }
250
251 mem = hcd_buffer_alloc_pages(hcd,
252 size, GFP_USER | __GFP_NOWARN, &dma_handle);
253 if (!mem) {
254 ret = -ENOMEM;
255 goto error_free_usbm;
256 }
257
258 memset(mem, 0, size);
259
260 usbm->mem = mem;
261 usbm->dma_handle = dma_handle;
262 usbm->size = size;
263 usbm->ps = ps;
264 usbm->vm_start = vma->vm_start;
265 usbm->vma_use_count = 1;
266 INIT_LIST_HEAD(&usbm->memlist);
267
268 /*
269 * In DMA-unavailable cases, hcd_buffer_alloc_pages allocates
270 * normal pages and assigns DMA_MAPPING_ERROR to dma_handle. Check
271 * whether we are in such cases, and then use remap_pfn_range (or
272 * dma_mmap_coherent) to map normal (or DMA) pages into the user
273 * space, respectively.
274 */
275 if (dma_handle == DMA_MAPPING_ERROR) {
276 if (remap_pfn_range(vma, vma->vm_start,
277 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
278 size, vma->vm_page_prot) < 0) {
279 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
280 return -EAGAIN;
281 }
282 } else {
283 if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
284 size)) {
285 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
286 return -EAGAIN;
287 }
288 }
289
290 vm_flags_set(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP);
291 vma->vm_ops = &usbdev_vm_ops;
292 vma->vm_private_data = usbm;
293
294 spin_lock_irqsave(&ps->lock, flags);
295 list_add_tail(&usbm->memlist, &ps->memory_list);
296 spin_unlock_irqrestore(&ps->lock, flags);
297
298 return 0;
299
300error_free_usbm:
301 kfree(usbm);
302error_decrease_mem:
303 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
304error:
305 return ret;
306}
307
308static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
309 loff_t *ppos)
310{
311 struct usb_dev_state *ps = file->private_data;
312 struct usb_device *dev = ps->dev;
313 ssize_t ret = 0;
314 unsigned len;
315 loff_t pos;
316 int i;
317
318 pos = *ppos;
319 usb_lock_device(dev);
320 if (!connected(ps)) {
321 ret = -ENODEV;
322 goto err;
323 } else if (pos < 0) {
324 ret = -EINVAL;
325 goto err;
326 }
327
328 if (pos < sizeof(struct usb_device_descriptor)) {
329 /* 18 bytes - fits on the stack */
330 struct usb_device_descriptor temp_desc;
331
332 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
333 le16_to_cpus(&temp_desc.bcdUSB);
334 le16_to_cpus(&temp_desc.idVendor);
335 le16_to_cpus(&temp_desc.idProduct);
336 le16_to_cpus(&temp_desc.bcdDevice);
337
338 len = sizeof(struct usb_device_descriptor) - pos;
339 if (len > nbytes)
340 len = nbytes;
341 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
342 ret = -EFAULT;
343 goto err;
344 }
345
346 *ppos += len;
347 buf += len;
348 nbytes -= len;
349 ret += len;
350 }
351
352 pos = sizeof(struct usb_device_descriptor);
353 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
354 struct usb_config_descriptor *config =
355 (struct usb_config_descriptor *)dev->rawdescriptors[i];
356 unsigned int length = le16_to_cpu(config->wTotalLength);
357
358 if (*ppos < pos + length) {
359
360 /* The descriptor may claim to be longer than it
361 * really is. Here is the actual allocated length. */
362 unsigned alloclen =
363 le16_to_cpu(dev->config[i].desc.wTotalLength);
364
365 len = length - (*ppos - pos);
366 if (len > nbytes)
367 len = nbytes;
368
369 /* Simply don't write (skip over) unallocated parts */
370 if (alloclen > (*ppos - pos)) {
371 alloclen -= (*ppos - pos);
372 if (copy_to_user(buf,
373 dev->rawdescriptors[i] + (*ppos - pos),
374 min(len, alloclen))) {
375 ret = -EFAULT;
376 goto err;
377 }
378 }
379
380 *ppos += len;
381 buf += len;
382 nbytes -= len;
383 ret += len;
384 }
385
386 pos += length;
387 }
388
389err:
390 usb_unlock_device(dev);
391 return ret;
392}
393
394/*
395 * async list handling
396 */
397
398static struct async *alloc_async(unsigned int numisoframes)
399{
400 struct async *as;
401
402 as = kzalloc(sizeof(struct async), GFP_KERNEL);
403 if (!as)
404 return NULL;
405 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
406 if (!as->urb) {
407 kfree(as);
408 return NULL;
409 }
410 return as;
411}
412
413static void free_async(struct async *as)
414{
415 int i;
416
417 put_pid(as->pid);
418 if (as->cred)
419 put_cred(as->cred);
420 for (i = 0; i < as->urb->num_sgs; i++) {
421 if (sg_page(&as->urb->sg[i]))
422 kfree(sg_virt(&as->urb->sg[i]));
423 }
424
425 kfree(as->urb->sg);
426 if (as->usbm == NULL)
427 kfree(as->urb->transfer_buffer);
428 else
429 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
430
431 kfree(as->urb->setup_packet);
432 usb_free_urb(as->urb);
433 usbfs_decrease_memory_usage(as->mem_usage);
434 kfree(as);
435}
436
437static void async_newpending(struct async *as)
438{
439 struct usb_dev_state *ps = as->ps;
440 unsigned long flags;
441
442 spin_lock_irqsave(&ps->lock, flags);
443 list_add_tail(&as->asynclist, &ps->async_pending);
444 spin_unlock_irqrestore(&ps->lock, flags);
445}
446
447static void async_removepending(struct async *as)
448{
449 struct usb_dev_state *ps = as->ps;
450 unsigned long flags;
451
452 spin_lock_irqsave(&ps->lock, flags);
453 list_del_init(&as->asynclist);
454 spin_unlock_irqrestore(&ps->lock, flags);
455}
456
457static struct async *async_getcompleted(struct usb_dev_state *ps)
458{
459 unsigned long flags;
460 struct async *as = NULL;
461
462 spin_lock_irqsave(&ps->lock, flags);
463 if (!list_empty(&ps->async_completed)) {
464 as = list_entry(ps->async_completed.next, struct async,
465 asynclist);
466 list_del_init(&as->asynclist);
467 }
468 spin_unlock_irqrestore(&ps->lock, flags);
469 return as;
470}
471
472static struct async *async_getpending(struct usb_dev_state *ps,
473 void __user *userurb)
474{
475 struct async *as;
476
477 list_for_each_entry(as, &ps->async_pending, asynclist)
478 if (as->userurb == userurb) {
479 list_del_init(&as->asynclist);
480 return as;
481 }
482
483 return NULL;
484}
485
486static void snoop_urb(struct usb_device *udev,
487 void __user *userurb, int pipe, unsigned length,
488 int timeout_or_status, enum snoop_when when,
489 unsigned char *data, unsigned data_len)
490{
491 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
492 static const char *dirs[] = {"out", "in"};
493 int ep;
494 const char *t, *d;
495
496 if (!usbfs_snoop)
497 return;
498
499 ep = usb_pipeendpoint(pipe);
500 t = types[usb_pipetype(pipe)];
501 d = dirs[!!usb_pipein(pipe)];
502
503 if (userurb) { /* Async */
504 if (when == SUBMIT)
505 dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
506 "length %u\n",
507 userurb, ep, t, d, length);
508 else
509 dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
510 "actual_length %u status %d\n",
511 userurb, ep, t, d, length,
512 timeout_or_status);
513 } else {
514 if (when == SUBMIT)
515 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
516 "timeout %d\n",
517 ep, t, d, length, timeout_or_status);
518 else
519 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
520 "status %d\n",
521 ep, t, d, length, timeout_or_status);
522 }
523
524 data_len = min(data_len, usbfs_snoop_max);
525 if (data && data_len > 0) {
526 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
527 data, data_len, 1);
528 }
529}
530
531static void snoop_urb_data(struct urb *urb, unsigned len)
532{
533 int i, size;
534
535 len = min(len, usbfs_snoop_max);
536 if (!usbfs_snoop || len == 0)
537 return;
538
539 if (urb->num_sgs == 0) {
540 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
541 urb->transfer_buffer, len, 1);
542 return;
543 }
544
545 for (i = 0; i < urb->num_sgs && len; i++) {
546 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
547 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
548 sg_virt(&urb->sg[i]), size, 1);
549 len -= size;
550 }
551}
552
553static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
554{
555 unsigned i, len, size;
556
557 if (urb->number_of_packets > 0) /* Isochronous */
558 len = urb->transfer_buffer_length;
559 else /* Non-Isoc */
560 len = urb->actual_length;
561
562 if (urb->num_sgs == 0) {
563 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
564 return -EFAULT;
565 return 0;
566 }
567
568 for (i = 0; i < urb->num_sgs && len; i++) {
569 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
570 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
571 return -EFAULT;
572 userbuffer += size;
573 len -= size;
574 }
575
576 return 0;
577}
578
579#define AS_CONTINUATION 1
580#define AS_UNLINK 2
581
582static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
583__releases(ps->lock)
584__acquires(ps->lock)
585{
586 struct urb *urb;
587 struct async *as;
588
589 /* Mark all the pending URBs that match bulk_addr, up to but not
590 * including the first one without AS_CONTINUATION. If such an
591 * URB is encountered then a new transfer has already started so
592 * the endpoint doesn't need to be disabled; otherwise it does.
593 */
594 list_for_each_entry(as, &ps->async_pending, asynclist) {
595 if (as->bulk_addr == bulk_addr) {
596 if (as->bulk_status != AS_CONTINUATION)
597 goto rescan;
598 as->bulk_status = AS_UNLINK;
599 as->bulk_addr = 0;
600 }
601 }
602 ps->disabled_bulk_eps |= (1 << bulk_addr);
603
604 /* Now carefully unlink all the marked pending URBs */
605 rescan:
606 list_for_each_entry_reverse(as, &ps->async_pending, asynclist) {
607 if (as->bulk_status == AS_UNLINK) {
608 as->bulk_status = 0; /* Only once */
609 urb = as->urb;
610 usb_get_urb(urb);
611 spin_unlock(&ps->lock); /* Allow completions */
612 usb_unlink_urb(urb);
613 usb_put_urb(urb);
614 spin_lock(&ps->lock);
615 goto rescan;
616 }
617 }
618}
619
620static void async_completed(struct urb *urb)
621{
622 struct async *as = urb->context;
623 struct usb_dev_state *ps = as->ps;
624 struct pid *pid = NULL;
625 const struct cred *cred = NULL;
626 unsigned long flags;
627 sigval_t addr;
628 int signr, errno;
629
630 spin_lock_irqsave(&ps->lock, flags);
631 list_move_tail(&as->asynclist, &ps->async_completed);
632 as->status = urb->status;
633 signr = as->signr;
634 if (signr) {
635 errno = as->status;
636 addr = as->userurb_sigval;
637 pid = get_pid(as->pid);
638 cred = get_cred(as->cred);
639 }
640 snoop(&urb->dev->dev, "urb complete\n");
641 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
642 as->status, COMPLETE, NULL, 0);
643 if (usb_urb_dir_in(urb))
644 snoop_urb_data(urb, urb->actual_length);
645
646 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
647 as->status != -ENOENT)
648 cancel_bulk_urbs(ps, as->bulk_addr);
649
650 wake_up(&ps->wait);
651 spin_unlock_irqrestore(&ps->lock, flags);
652
653 if (signr) {
654 kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
655 put_pid(pid);
656 put_cred(cred);
657 }
658}
659
660static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
661{
662 struct urb *urb;
663 struct async *as;
664 unsigned long flags;
665
666 spin_lock_irqsave(&ps->lock, flags);
667 while (!list_empty(list)) {
668 as = list_last_entry(list, struct async, asynclist);
669 list_del_init(&as->asynclist);
670 urb = as->urb;
671 usb_get_urb(urb);
672
673 /* drop the spinlock so the completion handler can run */
674 spin_unlock_irqrestore(&ps->lock, flags);
675 usb_kill_urb(urb);
676 usb_put_urb(urb);
677 spin_lock_irqsave(&ps->lock, flags);
678 }
679 spin_unlock_irqrestore(&ps->lock, flags);
680}
681
682static void destroy_async_on_interface(struct usb_dev_state *ps,
683 unsigned int ifnum)
684{
685 struct list_head *p, *q, hitlist;
686 unsigned long flags;
687
688 INIT_LIST_HEAD(&hitlist);
689 spin_lock_irqsave(&ps->lock, flags);
690 list_for_each_safe(p, q, &ps->async_pending)
691 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
692 list_move_tail(p, &hitlist);
693 spin_unlock_irqrestore(&ps->lock, flags);
694 destroy_async(ps, &hitlist);
695}
696
697static void destroy_all_async(struct usb_dev_state *ps)
698{
699 destroy_async(ps, &ps->async_pending);
700}
701
702/*
703 * interface claims are made only at the request of user level code,
704 * which can also release them (explicitly or by closing files).
705 * they're also undone when devices disconnect.
706 */
707
708static int driver_probe(struct usb_interface *intf,
709 const struct usb_device_id *id)
710{
711 return -ENODEV;
712}
713
714static void driver_disconnect(struct usb_interface *intf)
715{
716 struct usb_dev_state *ps = usb_get_intfdata(intf);
717 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
718
719 if (!ps)
720 return;
721
722 /* NOTE: this relies on usbcore having canceled and completed
723 * all pending I/O requests; 2.6 does that.
724 */
725
726 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
727 clear_bit(ifnum, &ps->ifclaimed);
728 else
729 dev_warn(&intf->dev, "interface number %u out of range\n",
730 ifnum);
731
732 usb_set_intfdata(intf, NULL);
733
734 /* force async requests to complete */
735 destroy_async_on_interface(ps, ifnum);
736}
737
738/* We don't care about suspend/resume of claimed interfaces */
739static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
740{
741 return 0;
742}
743
744static int driver_resume(struct usb_interface *intf)
745{
746 return 0;
747}
748
749#ifdef CONFIG_PM
750/* The following routines apply to the entire device, not interfaces */
751void usbfs_notify_suspend(struct usb_device *udev)
752{
753 /* We don't need to handle this */
754}
755
756void usbfs_notify_resume(struct usb_device *udev)
757{
758 struct usb_dev_state *ps;
759
760 /* Protect against simultaneous remove or release */
761 mutex_lock(&usbfs_mutex);
762 list_for_each_entry(ps, &udev->filelist, list) {
763 WRITE_ONCE(ps->not_yet_resumed, 0);
764 wake_up_all(&ps->wait_for_resume);
765 }
766 mutex_unlock(&usbfs_mutex);
767}
768#endif
769
770struct usb_driver usbfs_driver = {
771 .name = "usbfs",
772 .probe = driver_probe,
773 .disconnect = driver_disconnect,
774 .suspend = driver_suspend,
775 .resume = driver_resume,
776 .supports_autosuspend = 1,
777};
778
779static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
780{
781 struct usb_device *dev = ps->dev;
782 struct usb_interface *intf;
783 int err;
784
785 if (ifnum >= 8*sizeof(ps->ifclaimed))
786 return -EINVAL;
787 /* already claimed */
788 if (test_bit(ifnum, &ps->ifclaimed))
789 return 0;
790
791 if (ps->privileges_dropped &&
792 !test_bit(ifnum, &ps->interface_allowed_mask))
793 return -EACCES;
794
795 intf = usb_ifnum_to_if(dev, ifnum);
796 if (!intf)
797 err = -ENOENT;
798 else {
799 unsigned int old_suppress;
800
801 /* suppress uevents while claiming interface */
802 old_suppress = dev_get_uevent_suppress(&intf->dev);
803 dev_set_uevent_suppress(&intf->dev, 1);
804 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
805 dev_set_uevent_suppress(&intf->dev, old_suppress);
806 }
807 if (err == 0)
808 set_bit(ifnum, &ps->ifclaimed);
809 return err;
810}
811
812static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
813{
814 struct usb_device *dev;
815 struct usb_interface *intf;
816 int err;
817
818 err = -EINVAL;
819 if (ifnum >= 8*sizeof(ps->ifclaimed))
820 return err;
821 dev = ps->dev;
822 intf = usb_ifnum_to_if(dev, ifnum);
823 if (!intf)
824 err = -ENOENT;
825 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
826 unsigned int old_suppress;
827
828 /* suppress uevents while releasing interface */
829 old_suppress = dev_get_uevent_suppress(&intf->dev);
830 dev_set_uevent_suppress(&intf->dev, 1);
831 usb_driver_release_interface(&usbfs_driver, intf);
832 dev_set_uevent_suppress(&intf->dev, old_suppress);
833 err = 0;
834 }
835 return err;
836}
837
838static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
839{
840 if (ps->dev->state != USB_STATE_CONFIGURED)
841 return -EHOSTUNREACH;
842 if (ifnum >= 8*sizeof(ps->ifclaimed))
843 return -EINVAL;
844 if (test_bit(ifnum, &ps->ifclaimed))
845 return 0;
846 /* if not yet claimed, claim it for the driver */
847 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
848 "interface %u before use\n", task_pid_nr(current),
849 current->comm, ifnum);
850 return claimintf(ps, ifnum);
851}
852
853static int findintfep(struct usb_device *dev, unsigned int ep)
854{
855 unsigned int i, j, e;
856 struct usb_interface *intf;
857 struct usb_host_interface *alts;
858 struct usb_endpoint_descriptor *endpt;
859
860 if (ep & ~(USB_DIR_IN|0xf))
861 return -EINVAL;
862 if (!dev->actconfig)
863 return -ESRCH;
864 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
865 intf = dev->actconfig->interface[i];
866 for (j = 0; j < intf->num_altsetting; j++) {
867 alts = &intf->altsetting[j];
868 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
869 endpt = &alts->endpoint[e].desc;
870 if (endpt->bEndpointAddress == ep)
871 return alts->desc.bInterfaceNumber;
872 }
873 }
874 }
875 return -ENOENT;
876}
877
878static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
879 unsigned int request, unsigned int index)
880{
881 int ret = 0;
882 struct usb_host_interface *alt_setting;
883
884 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
885 && ps->dev->state != USB_STATE_ADDRESS
886 && ps->dev->state != USB_STATE_CONFIGURED)
887 return -EHOSTUNREACH;
888 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
889 return 0;
890
891 /*
892 * check for the special corner case 'get_device_id' in the printer
893 * class specification, which we always want to allow as it is used
894 * to query things like ink level, etc.
895 */
896 if (requesttype == 0xa1 && request == 0) {
897 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
898 index >> 8, index & 0xff);
899 if (alt_setting
900 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
901 return 0;
902 }
903
904 index &= 0xff;
905 switch (requesttype & USB_RECIP_MASK) {
906 case USB_RECIP_ENDPOINT:
907 if ((index & ~USB_DIR_IN) == 0)
908 return 0;
909 ret = findintfep(ps->dev, index);
910 if (ret < 0) {
911 /*
912 * Some not fully compliant Win apps seem to get
913 * index wrong and have the endpoint number here
914 * rather than the endpoint address (with the
915 * correct direction). Win does let this through,
916 * so we'll not reject it here but leave it to
917 * the device to not break KVM. But we warn.
918 */
919 ret = findintfep(ps->dev, index ^ 0x80);
920 if (ret >= 0)
921 dev_info(&ps->dev->dev,
922 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
923 __func__, task_pid_nr(current),
924 current->comm, index, index ^ 0x80);
925 }
926 if (ret >= 0)
927 ret = checkintf(ps, ret);
928 break;
929
930 case USB_RECIP_INTERFACE:
931 ret = checkintf(ps, index);
932 break;
933 }
934 return ret;
935}
936
937static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
938 unsigned char ep)
939{
940 if (ep & USB_ENDPOINT_DIR_MASK)
941 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
942 else
943 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
944}
945
946static int parse_usbdevfs_streams(struct usb_dev_state *ps,
947 struct usbdevfs_streams __user *streams,
948 unsigned int *num_streams_ret,
949 unsigned int *num_eps_ret,
950 struct usb_host_endpoint ***eps_ret,
951 struct usb_interface **intf_ret)
952{
953 unsigned int i, num_streams, num_eps;
954 struct usb_host_endpoint **eps;
955 struct usb_interface *intf = NULL;
956 unsigned char ep;
957 int ifnum, ret;
958
959 if (get_user(num_streams, &streams->num_streams) ||
960 get_user(num_eps, &streams->num_eps))
961 return -EFAULT;
962
963 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
964 return -EINVAL;
965
966 /* The XHCI controller allows max 2 ^ 16 streams */
967 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
968 return -EINVAL;
969
970 eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
971 if (!eps)
972 return -ENOMEM;
973
974 for (i = 0; i < num_eps; i++) {
975 if (get_user(ep, &streams->eps[i])) {
976 ret = -EFAULT;
977 goto error;
978 }
979 eps[i] = ep_to_host_endpoint(ps->dev, ep);
980 if (!eps[i]) {
981 ret = -EINVAL;
982 goto error;
983 }
984
985 /* usb_alloc/free_streams operate on an usb_interface */
986 ifnum = findintfep(ps->dev, ep);
987 if (ifnum < 0) {
988 ret = ifnum;
989 goto error;
990 }
991
992 if (i == 0) {
993 ret = checkintf(ps, ifnum);
994 if (ret < 0)
995 goto error;
996 intf = usb_ifnum_to_if(ps->dev, ifnum);
997 } else {
998 /* Verify all eps belong to the same interface */
999 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
1000 ret = -EINVAL;
1001 goto error;
1002 }
1003 }
1004 }
1005
1006 if (num_streams_ret)
1007 *num_streams_ret = num_streams;
1008 *num_eps_ret = num_eps;
1009 *eps_ret = eps;
1010 *intf_ret = intf;
1011
1012 return 0;
1013
1014error:
1015 kfree(eps);
1016 return ret;
1017}
1018
1019static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
1020{
1021 struct device *dev;
1022
1023 dev = bus_find_device_by_devt(&usb_bus_type, devt);
1024 if (!dev)
1025 return NULL;
1026 return to_usb_device(dev);
1027}
1028
1029/*
1030 * file operations
1031 */
1032static int usbdev_open(struct inode *inode, struct file *file)
1033{
1034 struct usb_device *dev = NULL;
1035 struct usb_dev_state *ps;
1036 int ret;
1037
1038 ret = -ENOMEM;
1039 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
1040 if (!ps)
1041 goto out_free_ps;
1042
1043 ret = -ENODEV;
1044
1045 /* usbdev device-node */
1046 if (imajor(inode) == USB_DEVICE_MAJOR)
1047 dev = usbdev_lookup_by_devt(inode->i_rdev);
1048 if (!dev)
1049 goto out_free_ps;
1050
1051 usb_lock_device(dev);
1052 if (dev->state == USB_STATE_NOTATTACHED)
1053 goto out_unlock_device;
1054
1055 ret = usb_autoresume_device(dev);
1056 if (ret)
1057 goto out_unlock_device;
1058
1059 ps->dev = dev;
1060 ps->file = file;
1061 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1062 spin_lock_init(&ps->lock);
1063 INIT_LIST_HEAD(&ps->list);
1064 INIT_LIST_HEAD(&ps->async_pending);
1065 INIT_LIST_HEAD(&ps->async_completed);
1066 INIT_LIST_HEAD(&ps->memory_list);
1067 init_waitqueue_head(&ps->wait);
1068 init_waitqueue_head(&ps->wait_for_resume);
1069 ps->disc_pid = get_pid(task_pid(current));
1070 ps->cred = get_current_cred();
1071 smp_wmb();
1072
1073 /* Can't race with resume; the device is already active */
1074 list_add_tail(&ps->list, &dev->filelist);
1075 file->private_data = ps;
1076 usb_unlock_device(dev);
1077 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1078 current->comm);
1079 return ret;
1080
1081 out_unlock_device:
1082 usb_unlock_device(dev);
1083 usb_put_dev(dev);
1084 out_free_ps:
1085 kfree(ps);
1086 return ret;
1087}
1088
1089static int usbdev_release(struct inode *inode, struct file *file)
1090{
1091 struct usb_dev_state *ps = file->private_data;
1092 struct usb_device *dev = ps->dev;
1093 unsigned int ifnum;
1094 struct async *as;
1095
1096 usb_lock_device(dev);
1097 usb_hub_release_all_ports(dev, ps);
1098
1099 /* Protect against simultaneous resume */
1100 mutex_lock(&usbfs_mutex);
1101 list_del_init(&ps->list);
1102 mutex_unlock(&usbfs_mutex);
1103
1104 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1105 ifnum++) {
1106 if (test_bit(ifnum, &ps->ifclaimed))
1107 releaseintf(ps, ifnum);
1108 }
1109 destroy_all_async(ps);
1110 if (!ps->suspend_allowed)
1111 usb_autosuspend_device(dev);
1112 usb_unlock_device(dev);
1113 usb_put_dev(dev);
1114 put_pid(ps->disc_pid);
1115 put_cred(ps->cred);
1116
1117 as = async_getcompleted(ps);
1118 while (as) {
1119 free_async(as);
1120 as = async_getcompleted(ps);
1121 }
1122
1123 kfree(ps);
1124 return 0;
1125}
1126
1127static void usbfs_blocking_completion(struct urb *urb)
1128{
1129 complete((struct completion *) urb->context);
1130}
1131
1132/*
1133 * Much like usb_start_wait_urb, but returns status separately from
1134 * actual_length and uses a killable wait.
1135 */
1136static int usbfs_start_wait_urb(struct urb *urb, int timeout,
1137 unsigned int *actlen)
1138{
1139 DECLARE_COMPLETION_ONSTACK(ctx);
1140 unsigned long expire;
1141 int rc;
1142
1143 urb->context = &ctx;
1144 urb->complete = usbfs_blocking_completion;
1145 *actlen = 0;
1146 rc = usb_submit_urb(urb, GFP_KERNEL);
1147 if (unlikely(rc))
1148 return rc;
1149
1150 expire = (timeout ? msecs_to_jiffies(timeout) : MAX_SCHEDULE_TIMEOUT);
1151 rc = wait_for_completion_killable_timeout(&ctx, expire);
1152 if (rc <= 0) {
1153 usb_kill_urb(urb);
1154 *actlen = urb->actual_length;
1155 if (urb->status != -ENOENT)
1156 ; /* Completed before it was killed */
1157 else if (rc < 0)
1158 return -EINTR;
1159 else
1160 return -ETIMEDOUT;
1161 }
1162 *actlen = urb->actual_length;
1163 return urb->status;
1164}
1165
1166static int do_proc_control(struct usb_dev_state *ps,
1167 struct usbdevfs_ctrltransfer *ctrl)
1168{
1169 struct usb_device *dev = ps->dev;
1170 unsigned int tmo;
1171 unsigned char *tbuf;
1172 unsigned int wLength, actlen;
1173 int i, pipe, ret;
1174 struct urb *urb = NULL;
1175 struct usb_ctrlrequest *dr = NULL;
1176
1177 ret = check_ctrlrecip(ps, ctrl->bRequestType, ctrl->bRequest,
1178 ctrl->wIndex);
1179 if (ret)
1180 return ret;
1181 wLength = ctrl->wLength; /* To suppress 64k PAGE_SIZE warning */
1182 if (wLength > PAGE_SIZE)
1183 return -EINVAL;
1184 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1185 sizeof(struct usb_ctrlrequest));
1186 if (ret)
1187 return ret;
1188
1189 ret = -ENOMEM;
1190 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1191 if (!tbuf)
1192 goto done;
1193 urb = usb_alloc_urb(0, GFP_NOIO);
1194 if (!urb)
1195 goto done;
1196 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
1197 if (!dr)
1198 goto done;
1199
1200 dr->bRequestType = ctrl->bRequestType;
1201 dr->bRequest = ctrl->bRequest;
1202 dr->wValue = cpu_to_le16(ctrl->wValue);
1203 dr->wIndex = cpu_to_le16(ctrl->wIndex);
1204 dr->wLength = cpu_to_le16(ctrl->wLength);
1205
1206 tmo = ctrl->timeout;
1207 snoop(&dev->dev, "control urb: bRequestType=%02x "
1208 "bRequest=%02x wValue=%04x "
1209 "wIndex=%04x wLength=%04x\n",
1210 ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
1211 ctrl->wIndex, ctrl->wLength);
1212
1213 if ((ctrl->bRequestType & USB_DIR_IN) && wLength) {
1214 pipe = usb_rcvctrlpipe(dev, 0);
1215 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1216 wLength, NULL, NULL);
1217 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, NULL, 0);
1218
1219 usb_unlock_device(dev);
1220 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1221
1222 /* Linger a bit, prior to the next control message. */
1223 if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1224 msleep(200);
1225 usb_lock_device(dev);
1226 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, tbuf, actlen);
1227 if (!i && actlen) {
1228 if (copy_to_user(ctrl->data, tbuf, actlen)) {
1229 ret = -EFAULT;
1230 goto done;
1231 }
1232 }
1233 } else {
1234 if (wLength) {
1235 if (copy_from_user(tbuf, ctrl->data, wLength)) {
1236 ret = -EFAULT;
1237 goto done;
1238 }
1239 }
1240 pipe = usb_sndctrlpipe(dev, 0);
1241 usb_fill_control_urb(urb, dev, pipe, (unsigned char *) dr, tbuf,
1242 wLength, NULL, NULL);
1243 snoop_urb(dev, NULL, pipe, wLength, tmo, SUBMIT, tbuf, wLength);
1244
1245 usb_unlock_device(dev);
1246 i = usbfs_start_wait_urb(urb, tmo, &actlen);
1247
1248 /* Linger a bit, prior to the next control message. */
1249 if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1250 msleep(200);
1251 usb_lock_device(dev);
1252 snoop_urb(dev, NULL, pipe, actlen, i, COMPLETE, NULL, 0);
1253 }
1254 if (i < 0 && i != -EPIPE) {
1255 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1256 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1257 current->comm, ctrl->bRequestType, ctrl->bRequest,
1258 ctrl->wLength, i);
1259 }
1260 ret = (i < 0 ? i : actlen);
1261
1262 done:
1263 kfree(dr);
1264 usb_free_urb(urb);
1265 free_page((unsigned long) tbuf);
1266 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1267 sizeof(struct usb_ctrlrequest));
1268 return ret;
1269}
1270
1271static int proc_control(struct usb_dev_state *ps, void __user *arg)
1272{
1273 struct usbdevfs_ctrltransfer ctrl;
1274
1275 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1276 return -EFAULT;
1277 return do_proc_control(ps, &ctrl);
1278}
1279
1280static int do_proc_bulk(struct usb_dev_state *ps,
1281 struct usbdevfs_bulktransfer *bulk)
1282{
1283 struct usb_device *dev = ps->dev;
1284 unsigned int tmo, len1, len2, pipe;
1285 unsigned char *tbuf;
1286 int i, ret;
1287 struct urb *urb = NULL;
1288 struct usb_host_endpoint *ep;
1289
1290 ret = findintfep(ps->dev, bulk->ep);
1291 if (ret < 0)
1292 return ret;
1293 ret = checkintf(ps, ret);
1294 if (ret)
1295 return ret;
1296
1297 len1 = bulk->len;
1298 if (len1 < 0 || len1 >= (INT_MAX - sizeof(struct urb)))
1299 return -EINVAL;
1300
1301 if (bulk->ep & USB_DIR_IN)
1302 pipe = usb_rcvbulkpipe(dev, bulk->ep & 0x7f);
1303 else
1304 pipe = usb_sndbulkpipe(dev, bulk->ep & 0x7f);
1305 ep = usb_pipe_endpoint(dev, pipe);
1306 if (!ep || !usb_endpoint_maxp(&ep->desc))
1307 return -EINVAL;
1308 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1309 if (ret)
1310 return ret;
1311
1312 /*
1313 * len1 can be almost arbitrarily large. Don't WARN if it's
1314 * too big, just fail the request.
1315 */
1316 ret = -ENOMEM;
1317 tbuf = kmalloc(len1, GFP_KERNEL | __GFP_NOWARN);
1318 if (!tbuf)
1319 goto done;
1320 urb = usb_alloc_urb(0, GFP_KERNEL);
1321 if (!urb)
1322 goto done;
1323
1324 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
1325 USB_ENDPOINT_XFER_INT) {
1326 pipe = (pipe & ~(3 << 30)) | (PIPE_INTERRUPT << 30);
1327 usb_fill_int_urb(urb, dev, pipe, tbuf, len1,
1328 NULL, NULL, ep->desc.bInterval);
1329 } else {
1330 usb_fill_bulk_urb(urb, dev, pipe, tbuf, len1, NULL, NULL);
1331 }
1332
1333 tmo = bulk->timeout;
1334 if (bulk->ep & 0x80) {
1335 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1336
1337 usb_unlock_device(dev);
1338 i = usbfs_start_wait_urb(urb, tmo, &len2);
1339 usb_lock_device(dev);
1340 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1341
1342 if (!i && len2) {
1343 if (copy_to_user(bulk->data, tbuf, len2)) {
1344 ret = -EFAULT;
1345 goto done;
1346 }
1347 }
1348 } else {
1349 if (len1) {
1350 if (copy_from_user(tbuf, bulk->data, len1)) {
1351 ret = -EFAULT;
1352 goto done;
1353 }
1354 }
1355 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1356
1357 usb_unlock_device(dev);
1358 i = usbfs_start_wait_urb(urb, tmo, &len2);
1359 usb_lock_device(dev);
1360 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1361 }
1362 ret = (i < 0 ? i : len2);
1363 done:
1364 usb_free_urb(urb);
1365 kfree(tbuf);
1366 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1367 return ret;
1368}
1369
1370static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1371{
1372 struct usbdevfs_bulktransfer bulk;
1373
1374 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1375 return -EFAULT;
1376 return do_proc_bulk(ps, &bulk);
1377}
1378
1379static void check_reset_of_active_ep(struct usb_device *udev,
1380 unsigned int epnum, char *ioctl_name)
1381{
1382 struct usb_host_endpoint **eps;
1383 struct usb_host_endpoint *ep;
1384
1385 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1386 ep = eps[epnum & 0x0f];
1387 if (ep && !list_empty(&ep->urb_list))
1388 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1389 task_pid_nr(current), current->comm,
1390 ioctl_name, epnum);
1391}
1392
1393static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1394{
1395 unsigned int ep;
1396 int ret;
1397
1398 if (get_user(ep, (unsigned int __user *)arg))
1399 return -EFAULT;
1400 ret = findintfep(ps->dev, ep);
1401 if (ret < 0)
1402 return ret;
1403 ret = checkintf(ps, ret);
1404 if (ret)
1405 return ret;
1406 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1407 usb_reset_endpoint(ps->dev, ep);
1408 return 0;
1409}
1410
1411static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1412{
1413 unsigned int ep;
1414 int pipe;
1415 int ret;
1416
1417 if (get_user(ep, (unsigned int __user *)arg))
1418 return -EFAULT;
1419 ret = findintfep(ps->dev, ep);
1420 if (ret < 0)
1421 return ret;
1422 ret = checkintf(ps, ret);
1423 if (ret)
1424 return ret;
1425 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1426 if (ep & USB_DIR_IN)
1427 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1428 else
1429 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1430
1431 return usb_clear_halt(ps->dev, pipe);
1432}
1433
1434static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1435{
1436 struct usbdevfs_getdriver gd;
1437 struct usb_interface *intf;
1438 int ret;
1439
1440 if (copy_from_user(&gd, arg, sizeof(gd)))
1441 return -EFAULT;
1442 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1443 if (!intf || !intf->dev.driver)
1444 ret = -ENODATA;
1445 else {
1446 strscpy(gd.driver, intf->dev.driver->name,
1447 sizeof(gd.driver));
1448 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1449 }
1450 return ret;
1451}
1452
1453static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1454{
1455 struct usbdevfs_connectinfo ci;
1456
1457 memset(&ci, 0, sizeof(ci));
1458 ci.devnum = ps->dev->devnum;
1459 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1460
1461 if (copy_to_user(arg, &ci, sizeof(ci)))
1462 return -EFAULT;
1463 return 0;
1464}
1465
1466static int proc_conninfo_ex(struct usb_dev_state *ps,
1467 void __user *arg, size_t size)
1468{
1469 struct usbdevfs_conninfo_ex ci;
1470 struct usb_device *udev = ps->dev;
1471
1472 if (size < sizeof(ci.size))
1473 return -EINVAL;
1474
1475 memset(&ci, 0, sizeof(ci));
1476 ci.size = sizeof(ci);
1477 ci.busnum = udev->bus->busnum;
1478 ci.devnum = udev->devnum;
1479 ci.speed = udev->speed;
1480
1481 while (udev && udev->portnum != 0) {
1482 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1483 ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1484 udev->portnum;
1485 udev = udev->parent;
1486 }
1487
1488 if (ci.num_ports < ARRAY_SIZE(ci.ports))
1489 memmove(&ci.ports[0],
1490 &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1491 ci.num_ports);
1492
1493 if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1494 return -EFAULT;
1495
1496 return 0;
1497}
1498
1499static int proc_resetdevice(struct usb_dev_state *ps)
1500{
1501 struct usb_host_config *actconfig = ps->dev->actconfig;
1502 struct usb_interface *interface;
1503 int i, number;
1504
1505 /* Don't allow a device reset if the process has dropped the
1506 * privilege to do such things and any of the interfaces are
1507 * currently claimed.
1508 */
1509 if (ps->privileges_dropped && actconfig) {
1510 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1511 interface = actconfig->interface[i];
1512 number = interface->cur_altsetting->desc.bInterfaceNumber;
1513 if (usb_interface_claimed(interface) &&
1514 !test_bit(number, &ps->ifclaimed)) {
1515 dev_warn(&ps->dev->dev,
1516 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1517 number, interface->dev.driver->name, current->comm);
1518 return -EACCES;
1519 }
1520 }
1521 }
1522
1523 return usb_reset_device(ps->dev);
1524}
1525
1526static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1527{
1528 struct usbdevfs_setinterface setintf;
1529 int ret;
1530
1531 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1532 return -EFAULT;
1533 ret = checkintf(ps, setintf.interface);
1534 if (ret)
1535 return ret;
1536
1537 destroy_async_on_interface(ps, setintf.interface);
1538
1539 return usb_set_interface(ps->dev, setintf.interface,
1540 setintf.altsetting);
1541}
1542
1543static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1544{
1545 int u;
1546 int status = 0;
1547 struct usb_host_config *actconfig;
1548
1549 if (get_user(u, (int __user *)arg))
1550 return -EFAULT;
1551
1552 actconfig = ps->dev->actconfig;
1553
1554 /* Don't touch the device if any interfaces are claimed.
1555 * It could interfere with other drivers' operations, and if
1556 * an interface is claimed by usbfs it could easily deadlock.
1557 */
1558 if (actconfig) {
1559 int i;
1560
1561 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1562 if (usb_interface_claimed(actconfig->interface[i])) {
1563 dev_warn(&ps->dev->dev,
1564 "usbfs: interface %d claimed by %s "
1565 "while '%s' sets config #%d\n",
1566 actconfig->interface[i]
1567 ->cur_altsetting
1568 ->desc.bInterfaceNumber,
1569 actconfig->interface[i]
1570 ->dev.driver->name,
1571 current->comm, u);
1572 status = -EBUSY;
1573 break;
1574 }
1575 }
1576 }
1577
1578 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1579 * so avoid usb_set_configuration()'s kick to sysfs
1580 */
1581 if (status == 0) {
1582 if (actconfig && actconfig->desc.bConfigurationValue == u)
1583 status = usb_reset_configuration(ps->dev);
1584 else
1585 status = usb_set_configuration(ps->dev, u);
1586 }
1587
1588 return status;
1589}
1590
1591static struct usb_memory *
1592find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1593{
1594 struct usb_memory *usbm = NULL, *iter;
1595 unsigned long flags;
1596 unsigned long uurb_start = (unsigned long)uurb->buffer;
1597
1598 spin_lock_irqsave(&ps->lock, flags);
1599 list_for_each_entry(iter, &ps->memory_list, memlist) {
1600 if (uurb_start >= iter->vm_start &&
1601 uurb_start < iter->vm_start + iter->size) {
1602 if (uurb->buffer_length > iter->vm_start + iter->size -
1603 uurb_start) {
1604 usbm = ERR_PTR(-EINVAL);
1605 } else {
1606 usbm = iter;
1607 usbm->urb_use_count++;
1608 }
1609 break;
1610 }
1611 }
1612 spin_unlock_irqrestore(&ps->lock, flags);
1613 return usbm;
1614}
1615
1616static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1617 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1618 void __user *arg, sigval_t userurb_sigval)
1619{
1620 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1621 struct usb_host_endpoint *ep;
1622 struct async *as = NULL;
1623 struct usb_ctrlrequest *dr = NULL;
1624 unsigned int u, totlen, isofrmlen;
1625 int i, ret, num_sgs = 0, ifnum = -1;
1626 int number_of_packets = 0;
1627 unsigned int stream_id = 0;
1628 void *buf;
1629 bool is_in;
1630 bool allow_short = false;
1631 bool allow_zero = false;
1632 unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
1633 USBDEVFS_URB_BULK_CONTINUATION |
1634 USBDEVFS_URB_NO_FSBR |
1635 USBDEVFS_URB_ZERO_PACKET |
1636 USBDEVFS_URB_NO_INTERRUPT;
1637 /* USBDEVFS_URB_ISO_ASAP is a special case */
1638 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1639 mask |= USBDEVFS_URB_ISO_ASAP;
1640
1641 if (uurb->flags & ~mask)
1642 return -EINVAL;
1643
1644 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1645 return -EINVAL;
1646 if (uurb->buffer_length > 0 && !uurb->buffer)
1647 return -EINVAL;
1648 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1649 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1650 ifnum = findintfep(ps->dev, uurb->endpoint);
1651 if (ifnum < 0)
1652 return ifnum;
1653 ret = checkintf(ps, ifnum);
1654 if (ret)
1655 return ret;
1656 }
1657 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1658 if (!ep)
1659 return -ENOENT;
1660 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1661
1662 u = 0;
1663 switch (uurb->type) {
1664 case USBDEVFS_URB_TYPE_CONTROL:
1665 if (!usb_endpoint_xfer_control(&ep->desc))
1666 return -EINVAL;
1667 /* min 8 byte setup packet */
1668 if (uurb->buffer_length < 8)
1669 return -EINVAL;
1670 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1671 if (!dr)
1672 return -ENOMEM;
1673 if (copy_from_user(dr, uurb->buffer, 8)) {
1674 ret = -EFAULT;
1675 goto error;
1676 }
1677 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1678 ret = -EINVAL;
1679 goto error;
1680 }
1681 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1682 le16_to_cpu(dr->wIndex));
1683 if (ret)
1684 goto error;
1685 uurb->buffer_length = le16_to_cpu(dr->wLength);
1686 uurb->buffer += 8;
1687 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1688 is_in = true;
1689 uurb->endpoint |= USB_DIR_IN;
1690 } else {
1691 is_in = false;
1692 uurb->endpoint &= ~USB_DIR_IN;
1693 }
1694 if (is_in)
1695 allow_short = true;
1696 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1697 "bRequest=%02x wValue=%04x "
1698 "wIndex=%04x wLength=%04x\n",
1699 dr->bRequestType, dr->bRequest,
1700 __le16_to_cpu(dr->wValue),
1701 __le16_to_cpu(dr->wIndex),
1702 __le16_to_cpu(dr->wLength));
1703 u = sizeof(struct usb_ctrlrequest);
1704 break;
1705
1706 case USBDEVFS_URB_TYPE_BULK:
1707 if (!is_in)
1708 allow_zero = true;
1709 else
1710 allow_short = true;
1711 switch (usb_endpoint_type(&ep->desc)) {
1712 case USB_ENDPOINT_XFER_CONTROL:
1713 case USB_ENDPOINT_XFER_ISOC:
1714 return -EINVAL;
1715 case USB_ENDPOINT_XFER_INT:
1716 /* allow single-shot interrupt transfers */
1717 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1718 goto interrupt_urb;
1719 }
1720 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1721 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1722 num_sgs = 0;
1723 if (ep->streams)
1724 stream_id = uurb->stream_id;
1725 break;
1726
1727 case USBDEVFS_URB_TYPE_INTERRUPT:
1728 if (!usb_endpoint_xfer_int(&ep->desc))
1729 return -EINVAL;
1730 interrupt_urb:
1731 if (!is_in)
1732 allow_zero = true;
1733 else
1734 allow_short = true;
1735 break;
1736
1737 case USBDEVFS_URB_TYPE_ISO:
1738 /* arbitrary limit */
1739 if (uurb->number_of_packets < 1 ||
1740 uurb->number_of_packets > 128)
1741 return -EINVAL;
1742 if (!usb_endpoint_xfer_isoc(&ep->desc))
1743 return -EINVAL;
1744 number_of_packets = uurb->number_of_packets;
1745 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1746 number_of_packets;
1747 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1748 if (IS_ERR(isopkt)) {
1749 ret = PTR_ERR(isopkt);
1750 isopkt = NULL;
1751 goto error;
1752 }
1753 for (totlen = u = 0; u < number_of_packets; u++) {
1754 /*
1755 * arbitrary limit need for USB 3.1 Gen2
1756 * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1757 */
1758 if (isopkt[u].length > 98304) {
1759 ret = -EINVAL;
1760 goto error;
1761 }
1762 totlen += isopkt[u].length;
1763 }
1764 u *= sizeof(struct usb_iso_packet_descriptor);
1765 uurb->buffer_length = totlen;
1766 break;
1767
1768 default:
1769 return -EINVAL;
1770 }
1771
1772 if (uurb->buffer_length > 0 &&
1773 !access_ok(uurb->buffer, uurb->buffer_length)) {
1774 ret = -EFAULT;
1775 goto error;
1776 }
1777 as = alloc_async(number_of_packets);
1778 if (!as) {
1779 ret = -ENOMEM;
1780 goto error;
1781 }
1782
1783 as->usbm = find_memory_area(ps, uurb);
1784 if (IS_ERR(as->usbm)) {
1785 ret = PTR_ERR(as->usbm);
1786 as->usbm = NULL;
1787 goto error;
1788 }
1789
1790 /* do not use SG buffers when memory mapped segments
1791 * are in use
1792 */
1793 if (as->usbm)
1794 num_sgs = 0;
1795
1796 u += sizeof(struct async) + sizeof(struct urb) +
1797 (as->usbm ? 0 : uurb->buffer_length) +
1798 num_sgs * sizeof(struct scatterlist);
1799 ret = usbfs_increase_memory_usage(u);
1800 if (ret)
1801 goto error;
1802 as->mem_usage = u;
1803
1804 if (num_sgs) {
1805 as->urb->sg = kmalloc_array(num_sgs,
1806 sizeof(struct scatterlist),
1807 GFP_KERNEL | __GFP_NOWARN);
1808 if (!as->urb->sg) {
1809 ret = -ENOMEM;
1810 goto error;
1811 }
1812 as->urb->num_sgs = num_sgs;
1813 sg_init_table(as->urb->sg, as->urb->num_sgs);
1814
1815 totlen = uurb->buffer_length;
1816 for (i = 0; i < as->urb->num_sgs; i++) {
1817 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1818 buf = kmalloc(u, GFP_KERNEL);
1819 if (!buf) {
1820 ret = -ENOMEM;
1821 goto error;
1822 }
1823 sg_set_buf(&as->urb->sg[i], buf, u);
1824
1825 if (!is_in) {
1826 if (copy_from_user(buf, uurb->buffer, u)) {
1827 ret = -EFAULT;
1828 goto error;
1829 }
1830 uurb->buffer += u;
1831 }
1832 totlen -= u;
1833 }
1834 } else if (uurb->buffer_length > 0) {
1835 if (as->usbm) {
1836 unsigned long uurb_start = (unsigned long)uurb->buffer;
1837
1838 as->urb->transfer_buffer = as->usbm->mem +
1839 (uurb_start - as->usbm->vm_start);
1840 } else {
1841 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1842 GFP_KERNEL | __GFP_NOWARN);
1843 if (!as->urb->transfer_buffer) {
1844 ret = -ENOMEM;
1845 goto error;
1846 }
1847 if (!is_in) {
1848 if (copy_from_user(as->urb->transfer_buffer,
1849 uurb->buffer,
1850 uurb->buffer_length)) {
1851 ret = -EFAULT;
1852 goto error;
1853 }
1854 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1855 /*
1856 * Isochronous input data may end up being
1857 * discontiguous if some of the packets are
1858 * short. Clear the buffer so that the gaps
1859 * don't leak kernel data to userspace.
1860 */
1861 memset(as->urb->transfer_buffer, 0,
1862 uurb->buffer_length);
1863 }
1864 }
1865 }
1866 as->urb->dev = ps->dev;
1867 as->urb->pipe = (uurb->type << 30) |
1868 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1869 (uurb->endpoint & USB_DIR_IN);
1870
1871 /* This tedious sequence is necessary because the URB_* flags
1872 * are internal to the kernel and subject to change, whereas
1873 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1874 */
1875 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1876 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1877 u |= URB_ISO_ASAP;
1878 if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1879 u |= URB_SHORT_NOT_OK;
1880 if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1881 u |= URB_ZERO_PACKET;
1882 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1883 u |= URB_NO_INTERRUPT;
1884 as->urb->transfer_flags = u;
1885
1886 if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1887 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1888 if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1889 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1890
1891 as->urb->transfer_buffer_length = uurb->buffer_length;
1892 as->urb->setup_packet = (unsigned char *)dr;
1893 dr = NULL;
1894 as->urb->start_frame = uurb->start_frame;
1895 as->urb->number_of_packets = number_of_packets;
1896 as->urb->stream_id = stream_id;
1897
1898 if (ep->desc.bInterval) {
1899 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1900 ps->dev->speed == USB_SPEED_HIGH ||
1901 ps->dev->speed >= USB_SPEED_SUPER)
1902 as->urb->interval = 1 <<
1903 min(15, ep->desc.bInterval - 1);
1904 else
1905 as->urb->interval = ep->desc.bInterval;
1906 }
1907
1908 as->urb->context = as;
1909 as->urb->complete = async_completed;
1910 for (totlen = u = 0; u < number_of_packets; u++) {
1911 as->urb->iso_frame_desc[u].offset = totlen;
1912 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1913 totlen += isopkt[u].length;
1914 }
1915 kfree(isopkt);
1916 isopkt = NULL;
1917 as->ps = ps;
1918 as->userurb = arg;
1919 as->userurb_sigval = userurb_sigval;
1920 if (as->usbm) {
1921 unsigned long uurb_start = (unsigned long)uurb->buffer;
1922
1923 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1924 as->urb->transfer_dma = as->usbm->dma_handle +
1925 (uurb_start - as->usbm->vm_start);
1926 } else if (is_in && uurb->buffer_length > 0)
1927 as->userbuffer = uurb->buffer;
1928 as->signr = uurb->signr;
1929 as->ifnum = ifnum;
1930 as->pid = get_pid(task_pid(current));
1931 as->cred = get_current_cred();
1932 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1933 as->urb->transfer_buffer_length, 0, SUBMIT,
1934 NULL, 0);
1935 if (!is_in)
1936 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1937
1938 async_newpending(as);
1939
1940 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1941 spin_lock_irq(&ps->lock);
1942
1943 /* Not exactly the endpoint address; the direction bit is
1944 * shifted to the 0x10 position so that the value will be
1945 * between 0 and 31.
1946 */
1947 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1948 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1949 >> 3);
1950
1951 /* If this bulk URB is the start of a new transfer, re-enable
1952 * the endpoint. Otherwise mark it as a continuation URB.
1953 */
1954 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1955 as->bulk_status = AS_CONTINUATION;
1956 else
1957 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1958
1959 /* Don't accept continuation URBs if the endpoint is
1960 * disabled because of an earlier error.
1961 */
1962 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1963 ret = -EREMOTEIO;
1964 else
1965 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1966 spin_unlock_irq(&ps->lock);
1967 } else {
1968 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1969 }
1970
1971 if (ret) {
1972 dev_printk(KERN_DEBUG, &ps->dev->dev,
1973 "usbfs: usb_submit_urb returned %d\n", ret);
1974 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1975 0, ret, COMPLETE, NULL, 0);
1976 async_removepending(as);
1977 goto error;
1978 }
1979 return 0;
1980
1981 error:
1982 kfree(isopkt);
1983 kfree(dr);
1984 if (as)
1985 free_async(as);
1986 return ret;
1987}
1988
1989static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1990{
1991 struct usbdevfs_urb uurb;
1992 sigval_t userurb_sigval;
1993
1994 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1995 return -EFAULT;
1996
1997 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
1998 userurb_sigval.sival_ptr = arg;
1999
2000 return proc_do_submiturb(ps, &uurb,
2001 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
2002 arg, userurb_sigval);
2003}
2004
2005static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
2006{
2007 struct urb *urb;
2008 struct async *as;
2009 unsigned long flags;
2010
2011 spin_lock_irqsave(&ps->lock, flags);
2012 as = async_getpending(ps, arg);
2013 if (!as) {
2014 spin_unlock_irqrestore(&ps->lock, flags);
2015 return -EINVAL;
2016 }
2017
2018 urb = as->urb;
2019 usb_get_urb(urb);
2020 spin_unlock_irqrestore(&ps->lock, flags);
2021
2022 usb_kill_urb(urb);
2023 usb_put_urb(urb);
2024
2025 return 0;
2026}
2027
2028static void compute_isochronous_actual_length(struct urb *urb)
2029{
2030 unsigned int i;
2031
2032 if (urb->number_of_packets > 0) {
2033 urb->actual_length = 0;
2034 for (i = 0; i < urb->number_of_packets; i++)
2035 urb->actual_length +=
2036 urb->iso_frame_desc[i].actual_length;
2037 }
2038}
2039
2040static int processcompl(struct async *as, void __user * __user *arg)
2041{
2042 struct urb *urb = as->urb;
2043 struct usbdevfs_urb __user *userurb = as->userurb;
2044 void __user *addr = as->userurb;
2045 unsigned int i;
2046
2047 compute_isochronous_actual_length(urb);
2048 if (as->userbuffer && urb->actual_length) {
2049 if (copy_urb_data_to_user(as->userbuffer, urb))
2050 goto err_out;
2051 }
2052 if (put_user(as->status, &userurb->status))
2053 goto err_out;
2054 if (put_user(urb->actual_length, &userurb->actual_length))
2055 goto err_out;
2056 if (put_user(urb->error_count, &userurb->error_count))
2057 goto err_out;
2058
2059 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2060 for (i = 0; i < urb->number_of_packets; i++) {
2061 if (put_user(urb->iso_frame_desc[i].actual_length,
2062 &userurb->iso_frame_desc[i].actual_length))
2063 goto err_out;
2064 if (put_user(urb->iso_frame_desc[i].status,
2065 &userurb->iso_frame_desc[i].status))
2066 goto err_out;
2067 }
2068 }
2069
2070 if (put_user(addr, (void __user * __user *)arg))
2071 return -EFAULT;
2072 return 0;
2073
2074err_out:
2075 return -EFAULT;
2076}
2077
2078static struct async *reap_as(struct usb_dev_state *ps)
2079{
2080 DECLARE_WAITQUEUE(wait, current);
2081 struct async *as = NULL;
2082 struct usb_device *dev = ps->dev;
2083
2084 add_wait_queue(&ps->wait, &wait);
2085 for (;;) {
2086 __set_current_state(TASK_INTERRUPTIBLE);
2087 as = async_getcompleted(ps);
2088 if (as || !connected(ps))
2089 break;
2090 if (signal_pending(current))
2091 break;
2092 usb_unlock_device(dev);
2093 schedule();
2094 usb_lock_device(dev);
2095 }
2096 remove_wait_queue(&ps->wait, &wait);
2097 set_current_state(TASK_RUNNING);
2098 return as;
2099}
2100
2101static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
2102{
2103 struct async *as = reap_as(ps);
2104
2105 if (as) {
2106 int retval;
2107
2108 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2109 retval = processcompl(as, (void __user * __user *)arg);
2110 free_async(as);
2111 return retval;
2112 }
2113 if (signal_pending(current))
2114 return -EINTR;
2115 return -ENODEV;
2116}
2117
2118static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
2119{
2120 int retval;
2121 struct async *as;
2122
2123 as = async_getcompleted(ps);
2124 if (as) {
2125 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2126 retval = processcompl(as, (void __user * __user *)arg);
2127 free_async(as);
2128 } else {
2129 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2130 }
2131 return retval;
2132}
2133
2134#ifdef CONFIG_COMPAT
2135static int proc_control_compat(struct usb_dev_state *ps,
2136 struct usbdevfs_ctrltransfer32 __user *p32)
2137{
2138 struct usbdevfs_ctrltransfer ctrl;
2139 u32 udata;
2140
2141 if (copy_from_user(&ctrl, p32, sizeof(*p32) - sizeof(compat_caddr_t)) ||
2142 get_user(udata, &p32->data))
2143 return -EFAULT;
2144 ctrl.data = compat_ptr(udata);
2145 return do_proc_control(ps, &ctrl);
2146}
2147
2148static int proc_bulk_compat(struct usb_dev_state *ps,
2149 struct usbdevfs_bulktransfer32 __user *p32)
2150{
2151 struct usbdevfs_bulktransfer bulk;
2152 compat_caddr_t addr;
2153
2154 if (get_user(bulk.ep, &p32->ep) ||
2155 get_user(bulk.len, &p32->len) ||
2156 get_user(bulk.timeout, &p32->timeout) ||
2157 get_user(addr, &p32->data))
2158 return -EFAULT;
2159 bulk.data = compat_ptr(addr);
2160 return do_proc_bulk(ps, &bulk);
2161}
2162
2163static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2164{
2165 struct usbdevfs_disconnectsignal32 ds;
2166
2167 if (copy_from_user(&ds, arg, sizeof(ds)))
2168 return -EFAULT;
2169 ps->discsignr = ds.signr;
2170 ps->disccontext.sival_int = ds.context;
2171 return 0;
2172}
2173
2174static int get_urb32(struct usbdevfs_urb *kurb,
2175 struct usbdevfs_urb32 __user *uurb)
2176{
2177 struct usbdevfs_urb32 urb32;
2178 if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2179 return -EFAULT;
2180 kurb->type = urb32.type;
2181 kurb->endpoint = urb32.endpoint;
2182 kurb->status = urb32.status;
2183 kurb->flags = urb32.flags;
2184 kurb->buffer = compat_ptr(urb32.buffer);
2185 kurb->buffer_length = urb32.buffer_length;
2186 kurb->actual_length = urb32.actual_length;
2187 kurb->start_frame = urb32.start_frame;
2188 kurb->number_of_packets = urb32.number_of_packets;
2189 kurb->error_count = urb32.error_count;
2190 kurb->signr = urb32.signr;
2191 kurb->usercontext = compat_ptr(urb32.usercontext);
2192 return 0;
2193}
2194
2195static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2196{
2197 struct usbdevfs_urb uurb;
2198 sigval_t userurb_sigval;
2199
2200 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2201 return -EFAULT;
2202
2203 memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2204 userurb_sigval.sival_int = ptr_to_compat(arg);
2205
2206 return proc_do_submiturb(ps, &uurb,
2207 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2208 arg, userurb_sigval);
2209}
2210
2211static int processcompl_compat(struct async *as, void __user * __user *arg)
2212{
2213 struct urb *urb = as->urb;
2214 struct usbdevfs_urb32 __user *userurb = as->userurb;
2215 void __user *addr = as->userurb;
2216 unsigned int i;
2217
2218 compute_isochronous_actual_length(urb);
2219 if (as->userbuffer && urb->actual_length) {
2220 if (copy_urb_data_to_user(as->userbuffer, urb))
2221 return -EFAULT;
2222 }
2223 if (put_user(as->status, &userurb->status))
2224 return -EFAULT;
2225 if (put_user(urb->actual_length, &userurb->actual_length))
2226 return -EFAULT;
2227 if (put_user(urb->error_count, &userurb->error_count))
2228 return -EFAULT;
2229
2230 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2231 for (i = 0; i < urb->number_of_packets; i++) {
2232 if (put_user(urb->iso_frame_desc[i].actual_length,
2233 &userurb->iso_frame_desc[i].actual_length))
2234 return -EFAULT;
2235 if (put_user(urb->iso_frame_desc[i].status,
2236 &userurb->iso_frame_desc[i].status))
2237 return -EFAULT;
2238 }
2239 }
2240
2241 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2242 return -EFAULT;
2243 return 0;
2244}
2245
2246static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2247{
2248 struct async *as = reap_as(ps);
2249
2250 if (as) {
2251 int retval;
2252
2253 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2254 retval = processcompl_compat(as, (void __user * __user *)arg);
2255 free_async(as);
2256 return retval;
2257 }
2258 if (signal_pending(current))
2259 return -EINTR;
2260 return -ENODEV;
2261}
2262
2263static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2264{
2265 int retval;
2266 struct async *as;
2267
2268 as = async_getcompleted(ps);
2269 if (as) {
2270 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2271 retval = processcompl_compat(as, (void __user * __user *)arg);
2272 free_async(as);
2273 } else {
2274 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2275 }
2276 return retval;
2277}
2278
2279
2280#endif
2281
2282static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2283{
2284 struct usbdevfs_disconnectsignal ds;
2285
2286 if (copy_from_user(&ds, arg, sizeof(ds)))
2287 return -EFAULT;
2288 ps->discsignr = ds.signr;
2289 ps->disccontext.sival_ptr = ds.context;
2290 return 0;
2291}
2292
2293static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2294{
2295 unsigned int ifnum;
2296
2297 if (get_user(ifnum, (unsigned int __user *)arg))
2298 return -EFAULT;
2299 return claimintf(ps, ifnum);
2300}
2301
2302static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2303{
2304 unsigned int ifnum;
2305 int ret;
2306
2307 if (get_user(ifnum, (unsigned int __user *)arg))
2308 return -EFAULT;
2309 ret = releaseintf(ps, ifnum);
2310 if (ret < 0)
2311 return ret;
2312 destroy_async_on_interface(ps, ifnum);
2313 return 0;
2314}
2315
2316static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2317{
2318 int size;
2319 void *buf = NULL;
2320 int retval = 0;
2321 struct usb_interface *intf = NULL;
2322 struct usb_driver *driver = NULL;
2323
2324 if (ps->privileges_dropped)
2325 return -EACCES;
2326
2327 if (!connected(ps))
2328 return -ENODEV;
2329
2330 /* alloc buffer */
2331 size = _IOC_SIZE(ctl->ioctl_code);
2332 if (size > 0) {
2333 buf = kmalloc(size, GFP_KERNEL);
2334 if (buf == NULL)
2335 return -ENOMEM;
2336 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2337 if (copy_from_user(buf, ctl->data, size)) {
2338 kfree(buf);
2339 return -EFAULT;
2340 }
2341 } else {
2342 memset(buf, 0, size);
2343 }
2344 }
2345
2346 if (ps->dev->state != USB_STATE_CONFIGURED)
2347 retval = -EHOSTUNREACH;
2348 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2349 retval = -EINVAL;
2350 else switch (ctl->ioctl_code) {
2351
2352 /* disconnect kernel driver from interface */
2353 case USBDEVFS_DISCONNECT:
2354 if (intf->dev.driver) {
2355 driver = to_usb_driver(intf->dev.driver);
2356 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2357 usb_driver_release_interface(driver, intf);
2358 } else
2359 retval = -ENODATA;
2360 break;
2361
2362 /* let kernel drivers try to (re)bind to the interface */
2363 case USBDEVFS_CONNECT:
2364 if (!intf->dev.driver)
2365 retval = device_attach(&intf->dev);
2366 else
2367 retval = -EBUSY;
2368 break;
2369
2370 /* talk directly to the interface's driver */
2371 default:
2372 if (intf->dev.driver)
2373 driver = to_usb_driver(intf->dev.driver);
2374 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2375 retval = -ENOTTY;
2376 } else {
2377 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2378 if (retval == -ENOIOCTLCMD)
2379 retval = -ENOTTY;
2380 }
2381 }
2382
2383 /* cleanup and return */
2384 if (retval >= 0
2385 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2386 && size > 0
2387 && copy_to_user(ctl->data, buf, size) != 0)
2388 retval = -EFAULT;
2389
2390 kfree(buf);
2391 return retval;
2392}
2393
2394static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2395{
2396 struct usbdevfs_ioctl ctrl;
2397
2398 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2399 return -EFAULT;
2400 return proc_ioctl(ps, &ctrl);
2401}
2402
2403#ifdef CONFIG_COMPAT
2404static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2405{
2406 struct usbdevfs_ioctl32 ioc32;
2407 struct usbdevfs_ioctl ctrl;
2408
2409 if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2410 return -EFAULT;
2411 ctrl.ifno = ioc32.ifno;
2412 ctrl.ioctl_code = ioc32.ioctl_code;
2413 ctrl.data = compat_ptr(ioc32.data);
2414 return proc_ioctl(ps, &ctrl);
2415}
2416#endif
2417
2418static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2419{
2420 unsigned portnum;
2421 int rc;
2422
2423 if (get_user(portnum, (unsigned __user *) arg))
2424 return -EFAULT;
2425 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2426 if (rc == 0)
2427 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2428 portnum, task_pid_nr(current), current->comm);
2429 return rc;
2430}
2431
2432static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2433{
2434 unsigned portnum;
2435
2436 if (get_user(portnum, (unsigned __user *) arg))
2437 return -EFAULT;
2438 return usb_hub_release_port(ps->dev, portnum, ps);
2439}
2440
2441static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2442{
2443 __u32 caps;
2444
2445 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2446 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2447 USBDEVFS_CAP_DROP_PRIVILEGES |
2448 USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2449 if (!ps->dev->bus->no_stop_on_short)
2450 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2451 if (ps->dev->bus->sg_tablesize)
2452 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2453
2454 if (put_user(caps, (__u32 __user *)arg))
2455 return -EFAULT;
2456
2457 return 0;
2458}
2459
2460static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2461{
2462 struct usbdevfs_disconnect_claim dc;
2463 struct usb_interface *intf;
2464
2465 if (copy_from_user(&dc, arg, sizeof(dc)))
2466 return -EFAULT;
2467
2468 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2469 if (!intf)
2470 return -EINVAL;
2471
2472 if (intf->dev.driver) {
2473 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2474
2475 if (ps->privileges_dropped)
2476 return -EACCES;
2477
2478 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2479 strncmp(dc.driver, intf->dev.driver->name,
2480 sizeof(dc.driver)) != 0)
2481 return -EBUSY;
2482
2483 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2484 strncmp(dc.driver, intf->dev.driver->name,
2485 sizeof(dc.driver)) == 0)
2486 return -EBUSY;
2487
2488 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2489 usb_driver_release_interface(driver, intf);
2490 }
2491
2492 return claimintf(ps, dc.interface);
2493}
2494
2495static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2496{
2497 unsigned num_streams, num_eps;
2498 struct usb_host_endpoint **eps;
2499 struct usb_interface *intf;
2500 int r;
2501
2502 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2503 &eps, &intf);
2504 if (r)
2505 return r;
2506
2507 destroy_async_on_interface(ps,
2508 intf->altsetting[0].desc.bInterfaceNumber);
2509
2510 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2511 kfree(eps);
2512 return r;
2513}
2514
2515static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2516{
2517 unsigned num_eps;
2518 struct usb_host_endpoint **eps;
2519 struct usb_interface *intf;
2520 int r;
2521
2522 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2523 if (r)
2524 return r;
2525
2526 destroy_async_on_interface(ps,
2527 intf->altsetting[0].desc.bInterfaceNumber);
2528
2529 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2530 kfree(eps);
2531 return r;
2532}
2533
2534static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2535{
2536 u32 data;
2537
2538 if (copy_from_user(&data, arg, sizeof(data)))
2539 return -EFAULT;
2540
2541 /* This is a one way operation. Once privileges are
2542 * dropped, you cannot regain them. You may however reissue
2543 * this ioctl to shrink the allowed interfaces mask.
2544 */
2545 ps->interface_allowed_mask &= data;
2546 ps->privileges_dropped = true;
2547
2548 return 0;
2549}
2550
2551static int proc_forbid_suspend(struct usb_dev_state *ps)
2552{
2553 int ret = 0;
2554
2555 if (ps->suspend_allowed) {
2556 ret = usb_autoresume_device(ps->dev);
2557 if (ret == 0)
2558 ps->suspend_allowed = false;
2559 else if (ret != -ENODEV)
2560 ret = -EIO;
2561 }
2562 return ret;
2563}
2564
2565static int proc_allow_suspend(struct usb_dev_state *ps)
2566{
2567 if (!connected(ps))
2568 return -ENODEV;
2569
2570 WRITE_ONCE(ps->not_yet_resumed, 1);
2571 if (!ps->suspend_allowed) {
2572 usb_autosuspend_device(ps->dev);
2573 ps->suspend_allowed = true;
2574 }
2575 return 0;
2576}
2577
2578static int proc_wait_for_resume(struct usb_dev_state *ps)
2579{
2580 int ret;
2581
2582 usb_unlock_device(ps->dev);
2583 ret = wait_event_interruptible(ps->wait_for_resume,
2584 READ_ONCE(ps->not_yet_resumed) == 0);
2585 usb_lock_device(ps->dev);
2586
2587 if (ret != 0)
2588 return -EINTR;
2589 return proc_forbid_suspend(ps);
2590}
2591
2592/*
2593 * NOTE: All requests here that have interface numbers as parameters
2594 * are assuming that somehow the configuration has been prevented from
2595 * changing. But there's no mechanism to ensure that...
2596 */
2597static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2598 void __user *p)
2599{
2600 struct usb_dev_state *ps = file->private_data;
2601 struct inode *inode = file_inode(file);
2602 struct usb_device *dev = ps->dev;
2603 int ret = -ENOTTY;
2604
2605 if (!(file->f_mode & FMODE_WRITE))
2606 return -EPERM;
2607
2608 usb_lock_device(dev);
2609
2610 /* Reap operations are allowed even after disconnection */
2611 switch (cmd) {
2612 case USBDEVFS_REAPURB:
2613 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2614 ret = proc_reapurb(ps, p);
2615 goto done;
2616
2617 case USBDEVFS_REAPURBNDELAY:
2618 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2619 ret = proc_reapurbnonblock(ps, p);
2620 goto done;
2621
2622#ifdef CONFIG_COMPAT
2623 case USBDEVFS_REAPURB32:
2624 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2625 ret = proc_reapurb_compat(ps, p);
2626 goto done;
2627
2628 case USBDEVFS_REAPURBNDELAY32:
2629 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2630 ret = proc_reapurbnonblock_compat(ps, p);
2631 goto done;
2632#endif
2633 }
2634
2635 if (!connected(ps)) {
2636 usb_unlock_device(dev);
2637 return -ENODEV;
2638 }
2639
2640 switch (cmd) {
2641 case USBDEVFS_CONTROL:
2642 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2643 ret = proc_control(ps, p);
2644 if (ret >= 0)
2645 inode_set_mtime_to_ts(inode,
2646 inode_set_ctime_current(inode));
2647 break;
2648
2649 case USBDEVFS_BULK:
2650 snoop(&dev->dev, "%s: BULK\n", __func__);
2651 ret = proc_bulk(ps, p);
2652 if (ret >= 0)
2653 inode_set_mtime_to_ts(inode,
2654 inode_set_ctime_current(inode));
2655 break;
2656
2657 case USBDEVFS_RESETEP:
2658 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2659 ret = proc_resetep(ps, p);
2660 if (ret >= 0)
2661 inode_set_mtime_to_ts(inode,
2662 inode_set_ctime_current(inode));
2663 break;
2664
2665 case USBDEVFS_RESET:
2666 snoop(&dev->dev, "%s: RESET\n", __func__);
2667 ret = proc_resetdevice(ps);
2668 break;
2669
2670 case USBDEVFS_CLEAR_HALT:
2671 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2672 ret = proc_clearhalt(ps, p);
2673 if (ret >= 0)
2674 inode_set_mtime_to_ts(inode,
2675 inode_set_ctime_current(inode));
2676 break;
2677
2678 case USBDEVFS_GETDRIVER:
2679 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2680 ret = proc_getdriver(ps, p);
2681 break;
2682
2683 case USBDEVFS_CONNECTINFO:
2684 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2685 ret = proc_connectinfo(ps, p);
2686 break;
2687
2688 case USBDEVFS_SETINTERFACE:
2689 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2690 ret = proc_setintf(ps, p);
2691 break;
2692
2693 case USBDEVFS_SETCONFIGURATION:
2694 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2695 ret = proc_setconfig(ps, p);
2696 break;
2697
2698 case USBDEVFS_SUBMITURB:
2699 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2700 ret = proc_submiturb(ps, p);
2701 if (ret >= 0)
2702 inode_set_mtime_to_ts(inode,
2703 inode_set_ctime_current(inode));
2704 break;
2705
2706#ifdef CONFIG_COMPAT
2707 case USBDEVFS_CONTROL32:
2708 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2709 ret = proc_control_compat(ps, p);
2710 if (ret >= 0)
2711 inode_set_mtime_to_ts(inode,
2712 inode_set_ctime_current(inode));
2713 break;
2714
2715 case USBDEVFS_BULK32:
2716 snoop(&dev->dev, "%s: BULK32\n", __func__);
2717 ret = proc_bulk_compat(ps, p);
2718 if (ret >= 0)
2719 inode_set_mtime_to_ts(inode,
2720 inode_set_ctime_current(inode));
2721 break;
2722
2723 case USBDEVFS_DISCSIGNAL32:
2724 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2725 ret = proc_disconnectsignal_compat(ps, p);
2726 break;
2727
2728 case USBDEVFS_SUBMITURB32:
2729 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2730 ret = proc_submiturb_compat(ps, p);
2731 if (ret >= 0)
2732 inode_set_mtime_to_ts(inode,
2733 inode_set_ctime_current(inode));
2734 break;
2735
2736 case USBDEVFS_IOCTL32:
2737 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2738 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2739 break;
2740#endif
2741
2742 case USBDEVFS_DISCARDURB:
2743 snoop(&dev->dev, "%s: DISCARDURB %px\n", __func__, p);
2744 ret = proc_unlinkurb(ps, p);
2745 break;
2746
2747 case USBDEVFS_DISCSIGNAL:
2748 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2749 ret = proc_disconnectsignal(ps, p);
2750 break;
2751
2752 case USBDEVFS_CLAIMINTERFACE:
2753 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2754 ret = proc_claiminterface(ps, p);
2755 break;
2756
2757 case USBDEVFS_RELEASEINTERFACE:
2758 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2759 ret = proc_releaseinterface(ps, p);
2760 break;
2761
2762 case USBDEVFS_IOCTL:
2763 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2764 ret = proc_ioctl_default(ps, p);
2765 break;
2766
2767 case USBDEVFS_CLAIM_PORT:
2768 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2769 ret = proc_claim_port(ps, p);
2770 break;
2771
2772 case USBDEVFS_RELEASE_PORT:
2773 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2774 ret = proc_release_port(ps, p);
2775 break;
2776 case USBDEVFS_GET_CAPABILITIES:
2777 ret = proc_get_capabilities(ps, p);
2778 break;
2779 case USBDEVFS_DISCONNECT_CLAIM:
2780 ret = proc_disconnect_claim(ps, p);
2781 break;
2782 case USBDEVFS_ALLOC_STREAMS:
2783 ret = proc_alloc_streams(ps, p);
2784 break;
2785 case USBDEVFS_FREE_STREAMS:
2786 ret = proc_free_streams(ps, p);
2787 break;
2788 case USBDEVFS_DROP_PRIVILEGES:
2789 ret = proc_drop_privileges(ps, p);
2790 break;
2791 case USBDEVFS_GET_SPEED:
2792 ret = ps->dev->speed;
2793 break;
2794 case USBDEVFS_FORBID_SUSPEND:
2795 ret = proc_forbid_suspend(ps);
2796 break;
2797 case USBDEVFS_ALLOW_SUSPEND:
2798 ret = proc_allow_suspend(ps);
2799 break;
2800 case USBDEVFS_WAIT_FOR_RESUME:
2801 ret = proc_wait_for_resume(ps);
2802 break;
2803 }
2804
2805 /* Handle variable-length commands */
2806 switch (cmd & ~IOCSIZE_MASK) {
2807 case USBDEVFS_CONNINFO_EX(0):
2808 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2809 break;
2810 }
2811
2812 done:
2813 usb_unlock_device(dev);
2814 if (ret >= 0)
2815 inode_set_atime_to_ts(inode, current_time(inode));
2816 return ret;
2817}
2818
2819static long usbdev_ioctl(struct file *file, unsigned int cmd,
2820 unsigned long arg)
2821{
2822 int ret;
2823
2824 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2825
2826 return ret;
2827}
2828
2829/* No kernel lock - fine */
2830static __poll_t usbdev_poll(struct file *file,
2831 struct poll_table_struct *wait)
2832{
2833 struct usb_dev_state *ps = file->private_data;
2834 __poll_t mask = 0;
2835
2836 poll_wait(file, &ps->wait, wait);
2837 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2838 mask |= EPOLLOUT | EPOLLWRNORM;
2839 if (!connected(ps))
2840 mask |= EPOLLHUP;
2841 if (list_empty(&ps->list))
2842 mask |= EPOLLERR;
2843 return mask;
2844}
2845
2846const struct file_operations usbdev_file_operations = {
2847 .owner = THIS_MODULE,
2848 .llseek = no_seek_end_llseek,
2849 .read = usbdev_read,
2850 .poll = usbdev_poll,
2851 .unlocked_ioctl = usbdev_ioctl,
2852 .compat_ioctl = compat_ptr_ioctl,
2853 .mmap = usbdev_mmap,
2854 .open = usbdev_open,
2855 .release = usbdev_release,
2856};
2857
2858static void usbdev_remove(struct usb_device *udev)
2859{
2860 struct usb_dev_state *ps;
2861
2862 /* Protect against simultaneous resume */
2863 mutex_lock(&usbfs_mutex);
2864 while (!list_empty(&udev->filelist)) {
2865 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2866 destroy_all_async(ps);
2867 wake_up_all(&ps->wait);
2868 WRITE_ONCE(ps->not_yet_resumed, 0);
2869 wake_up_all(&ps->wait_for_resume);
2870 list_del_init(&ps->list);
2871 if (ps->discsignr)
2872 kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2873 ps->disc_pid, ps->cred);
2874 }
2875 mutex_unlock(&usbfs_mutex);
2876}
2877
2878static int usbdev_notify(struct notifier_block *self,
2879 unsigned long action, void *dev)
2880{
2881 switch (action) {
2882 case USB_DEVICE_ADD:
2883 break;
2884 case USB_DEVICE_REMOVE:
2885 usbdev_remove(dev);
2886 break;
2887 }
2888 return NOTIFY_OK;
2889}
2890
2891static struct notifier_block usbdev_nb = {
2892 .notifier_call = usbdev_notify,
2893};
2894
2895static struct cdev usb_device_cdev;
2896
2897int __init usb_devio_init(void)
2898{
2899 int retval;
2900
2901 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2902 "usb_device");
2903 if (retval) {
2904 printk(KERN_ERR "Unable to register minors for usb_device\n");
2905 goto out;
2906 }
2907 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2908 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2909 if (retval) {
2910 printk(KERN_ERR "Unable to get usb_device major %d\n",
2911 USB_DEVICE_MAJOR);
2912 goto error_cdev;
2913 }
2914 usb_register_notify(&usbdev_nb);
2915out:
2916 return retval;
2917
2918error_cdev:
2919 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2920 goto out;
2921}
2922
2923void usb_devio_cleanup(void)
2924{
2925 usb_unregister_notify(&usbdev_nb);
2926 cdev_del(&usb_device_cdev);
2927 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2928}
1/*****************************************************************************/
2
3/*
4 * devio.c -- User space communication with USB devices.
5 *
6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 *
22 * This file implements the usbfs/x/y files, where
23 * x is the bus number and y the device number.
24 *
25 * It allows user space programs/"drivers" to communicate directly
26 * with USB devices without intervening kernel driver.
27 *
28 * Revision history
29 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
30 * 04.01.2000 0.2 Turned into its own filesystem
31 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
32 * (CAN-2005-3055)
33 */
34
35/*****************************************************************************/
36
37#include <linux/fs.h>
38#include <linux/mm.h>
39#include <linux/slab.h>
40#include <linux/signal.h>
41#include <linux/poll.h>
42#include <linux/module.h>
43#include <linux/usb.h>
44#include <linux/usbdevice_fs.h>
45#include <linux/usb/hcd.h> /* for usbcore internals */
46#include <linux/cdev.h>
47#include <linux/notifier.h>
48#include <linux/security.h>
49#include <linux/user_namespace.h>
50#include <asm/uaccess.h>
51#include <asm/byteorder.h>
52#include <linux/moduleparam.h>
53
54#include "usb.h"
55
56#define USB_MAXBUS 64
57#define USB_DEVICE_MAX USB_MAXBUS * 128
58
59/* Mutual exclusion for removal, open, and release */
60DEFINE_MUTEX(usbfs_mutex);
61
62struct dev_state {
63 struct list_head list; /* state list */
64 struct usb_device *dev;
65 struct file *file;
66 spinlock_t lock; /* protects the async urb lists */
67 struct list_head async_pending;
68 struct list_head async_completed;
69 wait_queue_head_t wait; /* wake up if a request completed */
70 unsigned int discsignr;
71 struct pid *disc_pid;
72 const struct cred *cred;
73 void __user *disccontext;
74 unsigned long ifclaimed;
75 u32 secid;
76 u32 disabled_bulk_eps;
77};
78
79struct async {
80 struct list_head asynclist;
81 struct dev_state *ps;
82 struct pid *pid;
83 const struct cred *cred;
84 unsigned int signr;
85 unsigned int ifnum;
86 void __user *userbuffer;
87 void __user *userurb;
88 struct urb *urb;
89 unsigned int mem_usage;
90 int status;
91 u32 secid;
92 u8 bulk_addr;
93 u8 bulk_status;
94};
95
96static bool usbfs_snoop;
97module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
98MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
99
100#define snoop(dev, format, arg...) \
101 do { \
102 if (usbfs_snoop) \
103 dev_info(dev , format , ## arg); \
104 } while (0)
105
106enum snoop_when {
107 SUBMIT, COMPLETE
108};
109
110#define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
111
112/* Limit on the total amount of memory we can allocate for transfers */
113static unsigned usbfs_memory_mb = 16;
114module_param(usbfs_memory_mb, uint, 0644);
115MODULE_PARM_DESC(usbfs_memory_mb,
116 "maximum MB allowed for usbfs buffers (0 = no limit)");
117
118/* Hard limit, necessary to avoid aithmetic overflow */
119#define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
120
121static atomic_t usbfs_memory_usage; /* Total memory currently allocated */
122
123/* Check whether it's okay to allocate more memory for a transfer */
124static int usbfs_increase_memory_usage(unsigned amount)
125{
126 unsigned lim;
127
128 /*
129 * Convert usbfs_memory_mb to bytes, avoiding overflows.
130 * 0 means use the hard limit (effectively unlimited).
131 */
132 lim = ACCESS_ONCE(usbfs_memory_mb);
133 if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
134 lim = USBFS_XFER_MAX;
135 else
136 lim <<= 20;
137
138 atomic_add(amount, &usbfs_memory_usage);
139 if (atomic_read(&usbfs_memory_usage) <= lim)
140 return 0;
141 atomic_sub(amount, &usbfs_memory_usage);
142 return -ENOMEM;
143}
144
145/* Memory for a transfer is being deallocated */
146static void usbfs_decrease_memory_usage(unsigned amount)
147{
148 atomic_sub(amount, &usbfs_memory_usage);
149}
150
151static int connected(struct dev_state *ps)
152{
153 return (!list_empty(&ps->list) &&
154 ps->dev->state != USB_STATE_NOTATTACHED);
155}
156
157static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
158{
159 loff_t ret;
160
161 mutex_lock(&file->f_dentry->d_inode->i_mutex);
162
163 switch (orig) {
164 case 0:
165 file->f_pos = offset;
166 ret = file->f_pos;
167 break;
168 case 1:
169 file->f_pos += offset;
170 ret = file->f_pos;
171 break;
172 case 2:
173 default:
174 ret = -EINVAL;
175 }
176
177 mutex_unlock(&file->f_dentry->d_inode->i_mutex);
178 return ret;
179}
180
181static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
182 loff_t *ppos)
183{
184 struct dev_state *ps = file->private_data;
185 struct usb_device *dev = ps->dev;
186 ssize_t ret = 0;
187 unsigned len;
188 loff_t pos;
189 int i;
190
191 pos = *ppos;
192 usb_lock_device(dev);
193 if (!connected(ps)) {
194 ret = -ENODEV;
195 goto err;
196 } else if (pos < 0) {
197 ret = -EINVAL;
198 goto err;
199 }
200
201 if (pos < sizeof(struct usb_device_descriptor)) {
202 /* 18 bytes - fits on the stack */
203 struct usb_device_descriptor temp_desc;
204
205 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
206 le16_to_cpus(&temp_desc.bcdUSB);
207 le16_to_cpus(&temp_desc.idVendor);
208 le16_to_cpus(&temp_desc.idProduct);
209 le16_to_cpus(&temp_desc.bcdDevice);
210
211 len = sizeof(struct usb_device_descriptor) - pos;
212 if (len > nbytes)
213 len = nbytes;
214 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
215 ret = -EFAULT;
216 goto err;
217 }
218
219 *ppos += len;
220 buf += len;
221 nbytes -= len;
222 ret += len;
223 }
224
225 pos = sizeof(struct usb_device_descriptor);
226 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
227 struct usb_config_descriptor *config =
228 (struct usb_config_descriptor *)dev->rawdescriptors[i];
229 unsigned int length = le16_to_cpu(config->wTotalLength);
230
231 if (*ppos < pos + length) {
232
233 /* The descriptor may claim to be longer than it
234 * really is. Here is the actual allocated length. */
235 unsigned alloclen =
236 le16_to_cpu(dev->config[i].desc.wTotalLength);
237
238 len = length - (*ppos - pos);
239 if (len > nbytes)
240 len = nbytes;
241
242 /* Simply don't write (skip over) unallocated parts */
243 if (alloclen > (*ppos - pos)) {
244 alloclen -= (*ppos - pos);
245 if (copy_to_user(buf,
246 dev->rawdescriptors[i] + (*ppos - pos),
247 min(len, alloclen))) {
248 ret = -EFAULT;
249 goto err;
250 }
251 }
252
253 *ppos += len;
254 buf += len;
255 nbytes -= len;
256 ret += len;
257 }
258
259 pos += length;
260 }
261
262err:
263 usb_unlock_device(dev);
264 return ret;
265}
266
267/*
268 * async list handling
269 */
270
271static struct async *alloc_async(unsigned int numisoframes)
272{
273 struct async *as;
274
275 as = kzalloc(sizeof(struct async), GFP_KERNEL);
276 if (!as)
277 return NULL;
278 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
279 if (!as->urb) {
280 kfree(as);
281 return NULL;
282 }
283 return as;
284}
285
286static void free_async(struct async *as)
287{
288 put_pid(as->pid);
289 if (as->cred)
290 put_cred(as->cred);
291 kfree(as->urb->transfer_buffer);
292 kfree(as->urb->setup_packet);
293 usb_free_urb(as->urb);
294 usbfs_decrease_memory_usage(as->mem_usage);
295 kfree(as);
296}
297
298static void async_newpending(struct async *as)
299{
300 struct dev_state *ps = as->ps;
301 unsigned long flags;
302
303 spin_lock_irqsave(&ps->lock, flags);
304 list_add_tail(&as->asynclist, &ps->async_pending);
305 spin_unlock_irqrestore(&ps->lock, flags);
306}
307
308static void async_removepending(struct async *as)
309{
310 struct dev_state *ps = as->ps;
311 unsigned long flags;
312
313 spin_lock_irqsave(&ps->lock, flags);
314 list_del_init(&as->asynclist);
315 spin_unlock_irqrestore(&ps->lock, flags);
316}
317
318static struct async *async_getcompleted(struct dev_state *ps)
319{
320 unsigned long flags;
321 struct async *as = NULL;
322
323 spin_lock_irqsave(&ps->lock, flags);
324 if (!list_empty(&ps->async_completed)) {
325 as = list_entry(ps->async_completed.next, struct async,
326 asynclist);
327 list_del_init(&as->asynclist);
328 }
329 spin_unlock_irqrestore(&ps->lock, flags);
330 return as;
331}
332
333static struct async *async_getpending(struct dev_state *ps,
334 void __user *userurb)
335{
336 struct async *as;
337
338 list_for_each_entry(as, &ps->async_pending, asynclist)
339 if (as->userurb == userurb) {
340 list_del_init(&as->asynclist);
341 return as;
342 }
343
344 return NULL;
345}
346
347static void snoop_urb(struct usb_device *udev,
348 void __user *userurb, int pipe, unsigned length,
349 int timeout_or_status, enum snoop_when when,
350 unsigned char *data, unsigned data_len)
351{
352 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
353 static const char *dirs[] = {"out", "in"};
354 int ep;
355 const char *t, *d;
356
357 if (!usbfs_snoop)
358 return;
359
360 ep = usb_pipeendpoint(pipe);
361 t = types[usb_pipetype(pipe)];
362 d = dirs[!!usb_pipein(pipe)];
363
364 if (userurb) { /* Async */
365 if (when == SUBMIT)
366 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
367 "length %u\n",
368 userurb, ep, t, d, length);
369 else
370 dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
371 "actual_length %u status %d\n",
372 userurb, ep, t, d, length,
373 timeout_or_status);
374 } else {
375 if (when == SUBMIT)
376 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
377 "timeout %d\n",
378 ep, t, d, length, timeout_or_status);
379 else
380 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
381 "status %d\n",
382 ep, t, d, length, timeout_or_status);
383 }
384
385 if (data && data_len > 0) {
386 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
387 data, data_len, 1);
388 }
389}
390
391#define AS_CONTINUATION 1
392#define AS_UNLINK 2
393
394static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
395__releases(ps->lock)
396__acquires(ps->lock)
397{
398 struct urb *urb;
399 struct async *as;
400
401 /* Mark all the pending URBs that match bulk_addr, up to but not
402 * including the first one without AS_CONTINUATION. If such an
403 * URB is encountered then a new transfer has already started so
404 * the endpoint doesn't need to be disabled; otherwise it does.
405 */
406 list_for_each_entry(as, &ps->async_pending, asynclist) {
407 if (as->bulk_addr == bulk_addr) {
408 if (as->bulk_status != AS_CONTINUATION)
409 goto rescan;
410 as->bulk_status = AS_UNLINK;
411 as->bulk_addr = 0;
412 }
413 }
414 ps->disabled_bulk_eps |= (1 << bulk_addr);
415
416 /* Now carefully unlink all the marked pending URBs */
417 rescan:
418 list_for_each_entry(as, &ps->async_pending, asynclist) {
419 if (as->bulk_status == AS_UNLINK) {
420 as->bulk_status = 0; /* Only once */
421 urb = as->urb;
422 usb_get_urb(urb);
423 spin_unlock(&ps->lock); /* Allow completions */
424 usb_unlink_urb(urb);
425 usb_put_urb(urb);
426 spin_lock(&ps->lock);
427 goto rescan;
428 }
429 }
430}
431
432static void async_completed(struct urb *urb)
433{
434 struct async *as = urb->context;
435 struct dev_state *ps = as->ps;
436 struct siginfo sinfo;
437 struct pid *pid = NULL;
438 u32 secid = 0;
439 const struct cred *cred = NULL;
440 int signr;
441
442 spin_lock(&ps->lock);
443 list_move_tail(&as->asynclist, &ps->async_completed);
444 as->status = urb->status;
445 signr = as->signr;
446 if (signr) {
447 sinfo.si_signo = as->signr;
448 sinfo.si_errno = as->status;
449 sinfo.si_code = SI_ASYNCIO;
450 sinfo.si_addr = as->userurb;
451 pid = get_pid(as->pid);
452 cred = get_cred(as->cred);
453 secid = as->secid;
454 }
455 snoop(&urb->dev->dev, "urb complete\n");
456 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
457 as->status, COMPLETE,
458 ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_OUT) ?
459 NULL : urb->transfer_buffer, urb->actual_length);
460 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
461 as->status != -ENOENT)
462 cancel_bulk_urbs(ps, as->bulk_addr);
463 spin_unlock(&ps->lock);
464
465 if (signr) {
466 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
467 put_pid(pid);
468 put_cred(cred);
469 }
470
471 wake_up(&ps->wait);
472}
473
474static void destroy_async(struct dev_state *ps, struct list_head *list)
475{
476 struct urb *urb;
477 struct async *as;
478 unsigned long flags;
479
480 spin_lock_irqsave(&ps->lock, flags);
481 while (!list_empty(list)) {
482 as = list_entry(list->next, struct async, asynclist);
483 list_del_init(&as->asynclist);
484 urb = as->urb;
485 usb_get_urb(urb);
486
487 /* drop the spinlock so the completion handler can run */
488 spin_unlock_irqrestore(&ps->lock, flags);
489 usb_kill_urb(urb);
490 usb_put_urb(urb);
491 spin_lock_irqsave(&ps->lock, flags);
492 }
493 spin_unlock_irqrestore(&ps->lock, flags);
494}
495
496static void destroy_async_on_interface(struct dev_state *ps,
497 unsigned int ifnum)
498{
499 struct list_head *p, *q, hitlist;
500 unsigned long flags;
501
502 INIT_LIST_HEAD(&hitlist);
503 spin_lock_irqsave(&ps->lock, flags);
504 list_for_each_safe(p, q, &ps->async_pending)
505 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
506 list_move_tail(p, &hitlist);
507 spin_unlock_irqrestore(&ps->lock, flags);
508 destroy_async(ps, &hitlist);
509}
510
511static void destroy_all_async(struct dev_state *ps)
512{
513 destroy_async(ps, &ps->async_pending);
514}
515
516/*
517 * interface claims are made only at the request of user level code,
518 * which can also release them (explicitly or by closing files).
519 * they're also undone when devices disconnect.
520 */
521
522static int driver_probe(struct usb_interface *intf,
523 const struct usb_device_id *id)
524{
525 return -ENODEV;
526}
527
528static void driver_disconnect(struct usb_interface *intf)
529{
530 struct dev_state *ps = usb_get_intfdata(intf);
531 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
532
533 if (!ps)
534 return;
535
536 /* NOTE: this relies on usbcore having canceled and completed
537 * all pending I/O requests; 2.6 does that.
538 */
539
540 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
541 clear_bit(ifnum, &ps->ifclaimed);
542 else
543 dev_warn(&intf->dev, "interface number %u out of range\n",
544 ifnum);
545
546 usb_set_intfdata(intf, NULL);
547
548 /* force async requests to complete */
549 destroy_async_on_interface(ps, ifnum);
550}
551
552/* The following routines are merely placeholders. There is no way
553 * to inform a user task about suspend or resumes.
554 */
555static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
556{
557 return 0;
558}
559
560static int driver_resume(struct usb_interface *intf)
561{
562 return 0;
563}
564
565struct usb_driver usbfs_driver = {
566 .name = "usbfs",
567 .probe = driver_probe,
568 .disconnect = driver_disconnect,
569 .suspend = driver_suspend,
570 .resume = driver_resume,
571};
572
573static int claimintf(struct dev_state *ps, unsigned int ifnum)
574{
575 struct usb_device *dev = ps->dev;
576 struct usb_interface *intf;
577 int err;
578
579 if (ifnum >= 8*sizeof(ps->ifclaimed))
580 return -EINVAL;
581 /* already claimed */
582 if (test_bit(ifnum, &ps->ifclaimed))
583 return 0;
584
585 intf = usb_ifnum_to_if(dev, ifnum);
586 if (!intf)
587 err = -ENOENT;
588 else
589 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
590 if (err == 0)
591 set_bit(ifnum, &ps->ifclaimed);
592 return err;
593}
594
595static int releaseintf(struct dev_state *ps, unsigned int ifnum)
596{
597 struct usb_device *dev;
598 struct usb_interface *intf;
599 int err;
600
601 err = -EINVAL;
602 if (ifnum >= 8*sizeof(ps->ifclaimed))
603 return err;
604 dev = ps->dev;
605 intf = usb_ifnum_to_if(dev, ifnum);
606 if (!intf)
607 err = -ENOENT;
608 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
609 usb_driver_release_interface(&usbfs_driver, intf);
610 err = 0;
611 }
612 return err;
613}
614
615static int checkintf(struct dev_state *ps, unsigned int ifnum)
616{
617 if (ps->dev->state != USB_STATE_CONFIGURED)
618 return -EHOSTUNREACH;
619 if (ifnum >= 8*sizeof(ps->ifclaimed))
620 return -EINVAL;
621 if (test_bit(ifnum, &ps->ifclaimed))
622 return 0;
623 /* if not yet claimed, claim it for the driver */
624 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
625 "interface %u before use\n", task_pid_nr(current),
626 current->comm, ifnum);
627 return claimintf(ps, ifnum);
628}
629
630static int findintfep(struct usb_device *dev, unsigned int ep)
631{
632 unsigned int i, j, e;
633 struct usb_interface *intf;
634 struct usb_host_interface *alts;
635 struct usb_endpoint_descriptor *endpt;
636
637 if (ep & ~(USB_DIR_IN|0xf))
638 return -EINVAL;
639 if (!dev->actconfig)
640 return -ESRCH;
641 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
642 intf = dev->actconfig->interface[i];
643 for (j = 0; j < intf->num_altsetting; j++) {
644 alts = &intf->altsetting[j];
645 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
646 endpt = &alts->endpoint[e].desc;
647 if (endpt->bEndpointAddress == ep)
648 return alts->desc.bInterfaceNumber;
649 }
650 }
651 }
652 return -ENOENT;
653}
654
655static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
656 unsigned int request, unsigned int index)
657{
658 int ret = 0;
659 struct usb_host_interface *alt_setting;
660
661 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
662 && ps->dev->state != USB_STATE_ADDRESS
663 && ps->dev->state != USB_STATE_CONFIGURED)
664 return -EHOSTUNREACH;
665 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
666 return 0;
667
668 /*
669 * check for the special corner case 'get_device_id' in the printer
670 * class specification, where wIndex is (interface << 8 | altsetting)
671 * instead of just interface
672 */
673 if (requesttype == 0xa1 && request == 0) {
674 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
675 index >> 8, index & 0xff);
676 if (alt_setting
677 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
678 index >>= 8;
679 }
680
681 index &= 0xff;
682 switch (requesttype & USB_RECIP_MASK) {
683 case USB_RECIP_ENDPOINT:
684 ret = findintfep(ps->dev, index);
685 if (ret >= 0)
686 ret = checkintf(ps, ret);
687 break;
688
689 case USB_RECIP_INTERFACE:
690 ret = checkintf(ps, index);
691 break;
692 }
693 return ret;
694}
695
696static int match_devt(struct device *dev, void *data)
697{
698 return dev->devt == (dev_t) (unsigned long) data;
699}
700
701static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
702{
703 struct device *dev;
704
705 dev = bus_find_device(&usb_bus_type, NULL,
706 (void *) (unsigned long) devt, match_devt);
707 if (!dev)
708 return NULL;
709 return container_of(dev, struct usb_device, dev);
710}
711
712/*
713 * file operations
714 */
715static int usbdev_open(struct inode *inode, struct file *file)
716{
717 struct usb_device *dev = NULL;
718 struct dev_state *ps;
719 int ret;
720
721 ret = -ENOMEM;
722 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
723 if (!ps)
724 goto out_free_ps;
725
726 ret = -ENODEV;
727
728 /* Protect against simultaneous removal or release */
729 mutex_lock(&usbfs_mutex);
730
731 /* usbdev device-node */
732 if (imajor(inode) == USB_DEVICE_MAJOR)
733 dev = usbdev_lookup_by_devt(inode->i_rdev);
734
735 mutex_unlock(&usbfs_mutex);
736
737 if (!dev)
738 goto out_free_ps;
739
740 usb_lock_device(dev);
741 if (dev->state == USB_STATE_NOTATTACHED)
742 goto out_unlock_device;
743
744 ret = usb_autoresume_device(dev);
745 if (ret)
746 goto out_unlock_device;
747
748 ps->dev = dev;
749 ps->file = file;
750 spin_lock_init(&ps->lock);
751 INIT_LIST_HEAD(&ps->list);
752 INIT_LIST_HEAD(&ps->async_pending);
753 INIT_LIST_HEAD(&ps->async_completed);
754 init_waitqueue_head(&ps->wait);
755 ps->discsignr = 0;
756 ps->disc_pid = get_pid(task_pid(current));
757 ps->cred = get_current_cred();
758 ps->disccontext = NULL;
759 ps->ifclaimed = 0;
760 security_task_getsecid(current, &ps->secid);
761 smp_wmb();
762 list_add_tail(&ps->list, &dev->filelist);
763 file->private_data = ps;
764 usb_unlock_device(dev);
765 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
766 current->comm);
767 return ret;
768
769 out_unlock_device:
770 usb_unlock_device(dev);
771 usb_put_dev(dev);
772 out_free_ps:
773 kfree(ps);
774 return ret;
775}
776
777static int usbdev_release(struct inode *inode, struct file *file)
778{
779 struct dev_state *ps = file->private_data;
780 struct usb_device *dev = ps->dev;
781 unsigned int ifnum;
782 struct async *as;
783
784 usb_lock_device(dev);
785 usb_hub_release_all_ports(dev, ps);
786
787 list_del_init(&ps->list);
788
789 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
790 ifnum++) {
791 if (test_bit(ifnum, &ps->ifclaimed))
792 releaseintf(ps, ifnum);
793 }
794 destroy_all_async(ps);
795 usb_autosuspend_device(dev);
796 usb_unlock_device(dev);
797 usb_put_dev(dev);
798 put_pid(ps->disc_pid);
799 put_cred(ps->cred);
800
801 as = async_getcompleted(ps);
802 while (as) {
803 free_async(as);
804 as = async_getcompleted(ps);
805 }
806 kfree(ps);
807 return 0;
808}
809
810static int proc_control(struct dev_state *ps, void __user *arg)
811{
812 struct usb_device *dev = ps->dev;
813 struct usbdevfs_ctrltransfer ctrl;
814 unsigned int tmo;
815 unsigned char *tbuf;
816 unsigned wLength;
817 int i, pipe, ret;
818
819 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
820 return -EFAULT;
821 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
822 ctrl.wIndex);
823 if (ret)
824 return ret;
825 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
826 if (wLength > PAGE_SIZE)
827 return -EINVAL;
828 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
829 sizeof(struct usb_ctrlrequest));
830 if (ret)
831 return ret;
832 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
833 if (!tbuf) {
834 ret = -ENOMEM;
835 goto done;
836 }
837 tmo = ctrl.timeout;
838 snoop(&dev->dev, "control urb: bRequestType=%02x "
839 "bRequest=%02x wValue=%04x "
840 "wIndex=%04x wLength=%04x\n",
841 ctrl.bRequestType, ctrl.bRequest,
842 __le16_to_cpup(&ctrl.wValue),
843 __le16_to_cpup(&ctrl.wIndex),
844 __le16_to_cpup(&ctrl.wLength));
845 if (ctrl.bRequestType & 0x80) {
846 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
847 ctrl.wLength)) {
848 ret = -EINVAL;
849 goto done;
850 }
851 pipe = usb_rcvctrlpipe(dev, 0);
852 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
853
854 usb_unlock_device(dev);
855 i = usb_control_msg(dev, pipe, ctrl.bRequest,
856 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
857 tbuf, ctrl.wLength, tmo);
858 usb_lock_device(dev);
859 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
860 tbuf, max(i, 0));
861 if ((i > 0) && ctrl.wLength) {
862 if (copy_to_user(ctrl.data, tbuf, i)) {
863 ret = -EFAULT;
864 goto done;
865 }
866 }
867 } else {
868 if (ctrl.wLength) {
869 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
870 ret = -EFAULT;
871 goto done;
872 }
873 }
874 pipe = usb_sndctrlpipe(dev, 0);
875 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
876 tbuf, ctrl.wLength);
877
878 usb_unlock_device(dev);
879 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
880 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
881 tbuf, ctrl.wLength, tmo);
882 usb_lock_device(dev);
883 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
884 }
885 if (i < 0 && i != -EPIPE) {
886 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
887 "failed cmd %s rqt %u rq %u len %u ret %d\n",
888 current->comm, ctrl.bRequestType, ctrl.bRequest,
889 ctrl.wLength, i);
890 }
891 ret = i;
892 done:
893 free_page((unsigned long) tbuf);
894 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
895 sizeof(struct usb_ctrlrequest));
896 return ret;
897}
898
899static int proc_bulk(struct dev_state *ps, void __user *arg)
900{
901 struct usb_device *dev = ps->dev;
902 struct usbdevfs_bulktransfer bulk;
903 unsigned int tmo, len1, pipe;
904 int len2;
905 unsigned char *tbuf;
906 int i, ret;
907
908 if (copy_from_user(&bulk, arg, sizeof(bulk)))
909 return -EFAULT;
910 ret = findintfep(ps->dev, bulk.ep);
911 if (ret < 0)
912 return ret;
913 ret = checkintf(ps, ret);
914 if (ret)
915 return ret;
916 if (bulk.ep & USB_DIR_IN)
917 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
918 else
919 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
920 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
921 return -EINVAL;
922 len1 = bulk.len;
923 if (len1 >= USBFS_XFER_MAX)
924 return -EINVAL;
925 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
926 if (ret)
927 return ret;
928 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) {
929 ret = -ENOMEM;
930 goto done;
931 }
932 tmo = bulk.timeout;
933 if (bulk.ep & 0x80) {
934 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
935 ret = -EINVAL;
936 goto done;
937 }
938 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
939
940 usb_unlock_device(dev);
941 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
942 usb_lock_device(dev);
943 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
944
945 if (!i && len2) {
946 if (copy_to_user(bulk.data, tbuf, len2)) {
947 ret = -EFAULT;
948 goto done;
949 }
950 }
951 } else {
952 if (len1) {
953 if (copy_from_user(tbuf, bulk.data, len1)) {
954 ret = -EFAULT;
955 goto done;
956 }
957 }
958 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
959
960 usb_unlock_device(dev);
961 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
962 usb_lock_device(dev);
963 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
964 }
965 ret = (i < 0 ? i : len2);
966 done:
967 kfree(tbuf);
968 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
969 return ret;
970}
971
972static int proc_resetep(struct dev_state *ps, void __user *arg)
973{
974 unsigned int ep;
975 int ret;
976
977 if (get_user(ep, (unsigned int __user *)arg))
978 return -EFAULT;
979 ret = findintfep(ps->dev, ep);
980 if (ret < 0)
981 return ret;
982 ret = checkintf(ps, ret);
983 if (ret)
984 return ret;
985 usb_reset_endpoint(ps->dev, ep);
986 return 0;
987}
988
989static int proc_clearhalt(struct dev_state *ps, void __user *arg)
990{
991 unsigned int ep;
992 int pipe;
993 int ret;
994
995 if (get_user(ep, (unsigned int __user *)arg))
996 return -EFAULT;
997 ret = findintfep(ps->dev, ep);
998 if (ret < 0)
999 return ret;
1000 ret = checkintf(ps, ret);
1001 if (ret)
1002 return ret;
1003 if (ep & USB_DIR_IN)
1004 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1005 else
1006 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1007
1008 return usb_clear_halt(ps->dev, pipe);
1009}
1010
1011static int proc_getdriver(struct dev_state *ps, void __user *arg)
1012{
1013 struct usbdevfs_getdriver gd;
1014 struct usb_interface *intf;
1015 int ret;
1016
1017 if (copy_from_user(&gd, arg, sizeof(gd)))
1018 return -EFAULT;
1019 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1020 if (!intf || !intf->dev.driver)
1021 ret = -ENODATA;
1022 else {
1023 strncpy(gd.driver, intf->dev.driver->name,
1024 sizeof(gd.driver));
1025 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1026 }
1027 return ret;
1028}
1029
1030static int proc_connectinfo(struct dev_state *ps, void __user *arg)
1031{
1032 struct usbdevfs_connectinfo ci = {
1033 .devnum = ps->dev->devnum,
1034 .slow = ps->dev->speed == USB_SPEED_LOW
1035 };
1036
1037 if (copy_to_user(arg, &ci, sizeof(ci)))
1038 return -EFAULT;
1039 return 0;
1040}
1041
1042static int proc_resetdevice(struct dev_state *ps)
1043{
1044 return usb_reset_device(ps->dev);
1045}
1046
1047static int proc_setintf(struct dev_state *ps, void __user *arg)
1048{
1049 struct usbdevfs_setinterface setintf;
1050 int ret;
1051
1052 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1053 return -EFAULT;
1054 if ((ret = checkintf(ps, setintf.interface)))
1055 return ret;
1056 return usb_set_interface(ps->dev, setintf.interface,
1057 setintf.altsetting);
1058}
1059
1060static int proc_setconfig(struct dev_state *ps, void __user *arg)
1061{
1062 int u;
1063 int status = 0;
1064 struct usb_host_config *actconfig;
1065
1066 if (get_user(u, (int __user *)arg))
1067 return -EFAULT;
1068
1069 actconfig = ps->dev->actconfig;
1070
1071 /* Don't touch the device if any interfaces are claimed.
1072 * It could interfere with other drivers' operations, and if
1073 * an interface is claimed by usbfs it could easily deadlock.
1074 */
1075 if (actconfig) {
1076 int i;
1077
1078 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1079 if (usb_interface_claimed(actconfig->interface[i])) {
1080 dev_warn(&ps->dev->dev,
1081 "usbfs: interface %d claimed by %s "
1082 "while '%s' sets config #%d\n",
1083 actconfig->interface[i]
1084 ->cur_altsetting
1085 ->desc.bInterfaceNumber,
1086 actconfig->interface[i]
1087 ->dev.driver->name,
1088 current->comm, u);
1089 status = -EBUSY;
1090 break;
1091 }
1092 }
1093 }
1094
1095 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1096 * so avoid usb_set_configuration()'s kick to sysfs
1097 */
1098 if (status == 0) {
1099 if (actconfig && actconfig->desc.bConfigurationValue == u)
1100 status = usb_reset_configuration(ps->dev);
1101 else
1102 status = usb_set_configuration(ps->dev, u);
1103 }
1104
1105 return status;
1106}
1107
1108static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1109 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1110 void __user *arg)
1111{
1112 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1113 struct usb_host_endpoint *ep;
1114 struct async *as = NULL;
1115 struct usb_ctrlrequest *dr = NULL;
1116 unsigned int u, totlen, isofrmlen;
1117 int ret, ifnum = -1;
1118 int is_in;
1119
1120 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1121 USBDEVFS_URB_SHORT_NOT_OK |
1122 USBDEVFS_URB_BULK_CONTINUATION |
1123 USBDEVFS_URB_NO_FSBR |
1124 USBDEVFS_URB_ZERO_PACKET |
1125 USBDEVFS_URB_NO_INTERRUPT))
1126 return -EINVAL;
1127 if (uurb->buffer_length > 0 && !uurb->buffer)
1128 return -EINVAL;
1129 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1130 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1131 ifnum = findintfep(ps->dev, uurb->endpoint);
1132 if (ifnum < 0)
1133 return ifnum;
1134 ret = checkintf(ps, ifnum);
1135 if (ret)
1136 return ret;
1137 }
1138 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1139 is_in = 1;
1140 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1141 } else {
1142 is_in = 0;
1143 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1144 }
1145 if (!ep)
1146 return -ENOENT;
1147
1148 u = 0;
1149 switch(uurb->type) {
1150 case USBDEVFS_URB_TYPE_CONTROL:
1151 if (!usb_endpoint_xfer_control(&ep->desc))
1152 return -EINVAL;
1153 /* min 8 byte setup packet */
1154 if (uurb->buffer_length < 8)
1155 return -EINVAL;
1156 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1157 if (!dr)
1158 return -ENOMEM;
1159 if (copy_from_user(dr, uurb->buffer, 8)) {
1160 ret = -EFAULT;
1161 goto error;
1162 }
1163 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1164 ret = -EINVAL;
1165 goto error;
1166 }
1167 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1168 le16_to_cpup(&dr->wIndex));
1169 if (ret)
1170 goto error;
1171 uurb->number_of_packets = 0;
1172 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1173 uurb->buffer += 8;
1174 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1175 is_in = 1;
1176 uurb->endpoint |= USB_DIR_IN;
1177 } else {
1178 is_in = 0;
1179 uurb->endpoint &= ~USB_DIR_IN;
1180 }
1181 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1182 "bRequest=%02x wValue=%04x "
1183 "wIndex=%04x wLength=%04x\n",
1184 dr->bRequestType, dr->bRequest,
1185 __le16_to_cpup(&dr->wValue),
1186 __le16_to_cpup(&dr->wIndex),
1187 __le16_to_cpup(&dr->wLength));
1188 u = sizeof(struct usb_ctrlrequest);
1189 break;
1190
1191 case USBDEVFS_URB_TYPE_BULK:
1192 switch (usb_endpoint_type(&ep->desc)) {
1193 case USB_ENDPOINT_XFER_CONTROL:
1194 case USB_ENDPOINT_XFER_ISOC:
1195 return -EINVAL;
1196 case USB_ENDPOINT_XFER_INT:
1197 /* allow single-shot interrupt transfers */
1198 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1199 goto interrupt_urb;
1200 }
1201 uurb->number_of_packets = 0;
1202 break;
1203
1204 case USBDEVFS_URB_TYPE_INTERRUPT:
1205 if (!usb_endpoint_xfer_int(&ep->desc))
1206 return -EINVAL;
1207 interrupt_urb:
1208 uurb->number_of_packets = 0;
1209 break;
1210
1211 case USBDEVFS_URB_TYPE_ISO:
1212 /* arbitrary limit */
1213 if (uurb->number_of_packets < 1 ||
1214 uurb->number_of_packets > 128)
1215 return -EINVAL;
1216 if (!usb_endpoint_xfer_isoc(&ep->desc))
1217 return -EINVAL;
1218 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1219 uurb->number_of_packets;
1220 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1221 return -ENOMEM;
1222 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1223 ret = -EFAULT;
1224 goto error;
1225 }
1226 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1227 /* arbitrary limit,
1228 * sufficient for USB 2.0 high-bandwidth iso */
1229 if (isopkt[u].length > 8192) {
1230 ret = -EINVAL;
1231 goto error;
1232 }
1233 totlen += isopkt[u].length;
1234 }
1235 u *= sizeof(struct usb_iso_packet_descriptor);
1236 uurb->buffer_length = totlen;
1237 break;
1238
1239 default:
1240 return -EINVAL;
1241 }
1242
1243 if (uurb->buffer_length >= USBFS_XFER_MAX) {
1244 ret = -EINVAL;
1245 goto error;
1246 }
1247 if (uurb->buffer_length > 0 &&
1248 !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1249 uurb->buffer, uurb->buffer_length)) {
1250 ret = -EFAULT;
1251 goto error;
1252 }
1253 as = alloc_async(uurb->number_of_packets);
1254 if (!as) {
1255 ret = -ENOMEM;
1256 goto error;
1257 }
1258 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length;
1259 ret = usbfs_increase_memory_usage(u);
1260 if (ret)
1261 goto error;
1262 as->mem_usage = u;
1263
1264 if (uurb->buffer_length > 0) {
1265 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1266 GFP_KERNEL);
1267 if (!as->urb->transfer_buffer) {
1268 ret = -ENOMEM;
1269 goto error;
1270 }
1271 /* Isochronous input data may end up being discontiguous
1272 * if some of the packets are short. Clear the buffer so
1273 * that the gaps don't leak kernel data to userspace.
1274 */
1275 if (is_in && uurb->type == USBDEVFS_URB_TYPE_ISO)
1276 memset(as->urb->transfer_buffer, 0,
1277 uurb->buffer_length);
1278 }
1279 as->urb->dev = ps->dev;
1280 as->urb->pipe = (uurb->type << 30) |
1281 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1282 (uurb->endpoint & USB_DIR_IN);
1283
1284 /* This tedious sequence is necessary because the URB_* flags
1285 * are internal to the kernel and subject to change, whereas
1286 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1287 */
1288 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1289 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1290 u |= URB_ISO_ASAP;
1291 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1292 u |= URB_SHORT_NOT_OK;
1293 if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1294 u |= URB_NO_FSBR;
1295 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1296 u |= URB_ZERO_PACKET;
1297 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1298 u |= URB_NO_INTERRUPT;
1299 as->urb->transfer_flags = u;
1300
1301 as->urb->transfer_buffer_length = uurb->buffer_length;
1302 as->urb->setup_packet = (unsigned char *)dr;
1303 dr = NULL;
1304 as->urb->start_frame = uurb->start_frame;
1305 as->urb->number_of_packets = uurb->number_of_packets;
1306 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1307 ps->dev->speed == USB_SPEED_HIGH)
1308 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1309 else
1310 as->urb->interval = ep->desc.bInterval;
1311 as->urb->context = as;
1312 as->urb->complete = async_completed;
1313 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1314 as->urb->iso_frame_desc[u].offset = totlen;
1315 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1316 totlen += isopkt[u].length;
1317 }
1318 kfree(isopkt);
1319 isopkt = NULL;
1320 as->ps = ps;
1321 as->userurb = arg;
1322 if (is_in && uurb->buffer_length > 0)
1323 as->userbuffer = uurb->buffer;
1324 else
1325 as->userbuffer = NULL;
1326 as->signr = uurb->signr;
1327 as->ifnum = ifnum;
1328 as->pid = get_pid(task_pid(current));
1329 as->cred = get_current_cred();
1330 security_task_getsecid(current, &as->secid);
1331 if (!is_in && uurb->buffer_length > 0) {
1332 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer,
1333 uurb->buffer_length)) {
1334 ret = -EFAULT;
1335 goto error;
1336 }
1337 }
1338 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1339 as->urb->transfer_buffer_length, 0, SUBMIT,
1340 is_in ? NULL : as->urb->transfer_buffer,
1341 uurb->buffer_length);
1342 async_newpending(as);
1343
1344 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1345 spin_lock_irq(&ps->lock);
1346
1347 /* Not exactly the endpoint address; the direction bit is
1348 * shifted to the 0x10 position so that the value will be
1349 * between 0 and 31.
1350 */
1351 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1352 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1353 >> 3);
1354
1355 /* If this bulk URB is the start of a new transfer, re-enable
1356 * the endpoint. Otherwise mark it as a continuation URB.
1357 */
1358 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1359 as->bulk_status = AS_CONTINUATION;
1360 else
1361 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1362
1363 /* Don't accept continuation URBs if the endpoint is
1364 * disabled because of an earlier error.
1365 */
1366 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1367 ret = -EREMOTEIO;
1368 else
1369 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1370 spin_unlock_irq(&ps->lock);
1371 } else {
1372 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1373 }
1374
1375 if (ret) {
1376 dev_printk(KERN_DEBUG, &ps->dev->dev,
1377 "usbfs: usb_submit_urb returned %d\n", ret);
1378 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1379 0, ret, COMPLETE, NULL, 0);
1380 async_removepending(as);
1381 goto error;
1382 }
1383 return 0;
1384
1385 error:
1386 kfree(isopkt);
1387 kfree(dr);
1388 if (as)
1389 free_async(as);
1390 return ret;
1391}
1392
1393static int proc_submiturb(struct dev_state *ps, void __user *arg)
1394{
1395 struct usbdevfs_urb uurb;
1396
1397 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1398 return -EFAULT;
1399
1400 return proc_do_submiturb(ps, &uurb,
1401 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1402 arg);
1403}
1404
1405static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1406{
1407 struct urb *urb;
1408 struct async *as;
1409 unsigned long flags;
1410
1411 spin_lock_irqsave(&ps->lock, flags);
1412 as = async_getpending(ps, arg);
1413 if (!as) {
1414 spin_unlock_irqrestore(&ps->lock, flags);
1415 return -EINVAL;
1416 }
1417
1418 urb = as->urb;
1419 usb_get_urb(urb);
1420 spin_unlock_irqrestore(&ps->lock, flags);
1421
1422 usb_kill_urb(urb);
1423 usb_put_urb(urb);
1424
1425 return 0;
1426}
1427
1428static int processcompl(struct async *as, void __user * __user *arg)
1429{
1430 struct urb *urb = as->urb;
1431 struct usbdevfs_urb __user *userurb = as->userurb;
1432 void __user *addr = as->userurb;
1433 unsigned int i;
1434
1435 if (as->userbuffer && urb->actual_length) {
1436 if (urb->number_of_packets > 0) /* Isochronous */
1437 i = urb->transfer_buffer_length;
1438 else /* Non-Isoc */
1439 i = urb->actual_length;
1440 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1441 goto err_out;
1442 }
1443 if (put_user(as->status, &userurb->status))
1444 goto err_out;
1445 if (put_user(urb->actual_length, &userurb->actual_length))
1446 goto err_out;
1447 if (put_user(urb->error_count, &userurb->error_count))
1448 goto err_out;
1449
1450 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1451 for (i = 0; i < urb->number_of_packets; i++) {
1452 if (put_user(urb->iso_frame_desc[i].actual_length,
1453 &userurb->iso_frame_desc[i].actual_length))
1454 goto err_out;
1455 if (put_user(urb->iso_frame_desc[i].status,
1456 &userurb->iso_frame_desc[i].status))
1457 goto err_out;
1458 }
1459 }
1460
1461 if (put_user(addr, (void __user * __user *)arg))
1462 return -EFAULT;
1463 return 0;
1464
1465err_out:
1466 return -EFAULT;
1467}
1468
1469static struct async *reap_as(struct dev_state *ps)
1470{
1471 DECLARE_WAITQUEUE(wait, current);
1472 struct async *as = NULL;
1473 struct usb_device *dev = ps->dev;
1474
1475 add_wait_queue(&ps->wait, &wait);
1476 for (;;) {
1477 __set_current_state(TASK_INTERRUPTIBLE);
1478 as = async_getcompleted(ps);
1479 if (as)
1480 break;
1481 if (signal_pending(current))
1482 break;
1483 usb_unlock_device(dev);
1484 schedule();
1485 usb_lock_device(dev);
1486 }
1487 remove_wait_queue(&ps->wait, &wait);
1488 set_current_state(TASK_RUNNING);
1489 return as;
1490}
1491
1492static int proc_reapurb(struct dev_state *ps, void __user *arg)
1493{
1494 struct async *as = reap_as(ps);
1495 if (as) {
1496 int retval = processcompl(as, (void __user * __user *)arg);
1497 free_async(as);
1498 return retval;
1499 }
1500 if (signal_pending(current))
1501 return -EINTR;
1502 return -EIO;
1503}
1504
1505static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1506{
1507 int retval;
1508 struct async *as;
1509
1510 as = async_getcompleted(ps);
1511 retval = -EAGAIN;
1512 if (as) {
1513 retval = processcompl(as, (void __user * __user *)arg);
1514 free_async(as);
1515 }
1516 return retval;
1517}
1518
1519#ifdef CONFIG_COMPAT
1520static int proc_control_compat(struct dev_state *ps,
1521 struct usbdevfs_ctrltransfer32 __user *p32)
1522{
1523 struct usbdevfs_ctrltransfer __user *p;
1524 __u32 udata;
1525 p = compat_alloc_user_space(sizeof(*p));
1526 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1527 get_user(udata, &p32->data) ||
1528 put_user(compat_ptr(udata), &p->data))
1529 return -EFAULT;
1530 return proc_control(ps, p);
1531}
1532
1533static int proc_bulk_compat(struct dev_state *ps,
1534 struct usbdevfs_bulktransfer32 __user *p32)
1535{
1536 struct usbdevfs_bulktransfer __user *p;
1537 compat_uint_t n;
1538 compat_caddr_t addr;
1539
1540 p = compat_alloc_user_space(sizeof(*p));
1541
1542 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1543 get_user(n, &p32->len) || put_user(n, &p->len) ||
1544 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1545 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1546 return -EFAULT;
1547
1548 return proc_bulk(ps, p);
1549}
1550static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1551{
1552 struct usbdevfs_disconnectsignal32 ds;
1553
1554 if (copy_from_user(&ds, arg, sizeof(ds)))
1555 return -EFAULT;
1556 ps->discsignr = ds.signr;
1557 ps->disccontext = compat_ptr(ds.context);
1558 return 0;
1559}
1560
1561static int get_urb32(struct usbdevfs_urb *kurb,
1562 struct usbdevfs_urb32 __user *uurb)
1563{
1564 __u32 uptr;
1565 if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1566 __get_user(kurb->type, &uurb->type) ||
1567 __get_user(kurb->endpoint, &uurb->endpoint) ||
1568 __get_user(kurb->status, &uurb->status) ||
1569 __get_user(kurb->flags, &uurb->flags) ||
1570 __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1571 __get_user(kurb->actual_length, &uurb->actual_length) ||
1572 __get_user(kurb->start_frame, &uurb->start_frame) ||
1573 __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1574 __get_user(kurb->error_count, &uurb->error_count) ||
1575 __get_user(kurb->signr, &uurb->signr))
1576 return -EFAULT;
1577
1578 if (__get_user(uptr, &uurb->buffer))
1579 return -EFAULT;
1580 kurb->buffer = compat_ptr(uptr);
1581 if (__get_user(uptr, &uurb->usercontext))
1582 return -EFAULT;
1583 kurb->usercontext = compat_ptr(uptr);
1584
1585 return 0;
1586}
1587
1588static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1589{
1590 struct usbdevfs_urb uurb;
1591
1592 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1593 return -EFAULT;
1594
1595 return proc_do_submiturb(ps, &uurb,
1596 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1597 arg);
1598}
1599
1600static int processcompl_compat(struct async *as, void __user * __user *arg)
1601{
1602 struct urb *urb = as->urb;
1603 struct usbdevfs_urb32 __user *userurb = as->userurb;
1604 void __user *addr = as->userurb;
1605 unsigned int i;
1606
1607 if (as->userbuffer && urb->actual_length) {
1608 if (urb->number_of_packets > 0) /* Isochronous */
1609 i = urb->transfer_buffer_length;
1610 else /* Non-Isoc */
1611 i = urb->actual_length;
1612 if (copy_to_user(as->userbuffer, urb->transfer_buffer, i))
1613 return -EFAULT;
1614 }
1615 if (put_user(as->status, &userurb->status))
1616 return -EFAULT;
1617 if (put_user(urb->actual_length, &userurb->actual_length))
1618 return -EFAULT;
1619 if (put_user(urb->error_count, &userurb->error_count))
1620 return -EFAULT;
1621
1622 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1623 for (i = 0; i < urb->number_of_packets; i++) {
1624 if (put_user(urb->iso_frame_desc[i].actual_length,
1625 &userurb->iso_frame_desc[i].actual_length))
1626 return -EFAULT;
1627 if (put_user(urb->iso_frame_desc[i].status,
1628 &userurb->iso_frame_desc[i].status))
1629 return -EFAULT;
1630 }
1631 }
1632
1633 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1634 return -EFAULT;
1635 return 0;
1636}
1637
1638static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1639{
1640 struct async *as = reap_as(ps);
1641 if (as) {
1642 int retval = processcompl_compat(as, (void __user * __user *)arg);
1643 free_async(as);
1644 return retval;
1645 }
1646 if (signal_pending(current))
1647 return -EINTR;
1648 return -EIO;
1649}
1650
1651static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1652{
1653 int retval;
1654 struct async *as;
1655
1656 retval = -EAGAIN;
1657 as = async_getcompleted(ps);
1658 if (as) {
1659 retval = processcompl_compat(as, (void __user * __user *)arg);
1660 free_async(as);
1661 }
1662 return retval;
1663}
1664
1665
1666#endif
1667
1668static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1669{
1670 struct usbdevfs_disconnectsignal ds;
1671
1672 if (copy_from_user(&ds, arg, sizeof(ds)))
1673 return -EFAULT;
1674 ps->discsignr = ds.signr;
1675 ps->disccontext = ds.context;
1676 return 0;
1677}
1678
1679static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1680{
1681 unsigned int ifnum;
1682
1683 if (get_user(ifnum, (unsigned int __user *)arg))
1684 return -EFAULT;
1685 return claimintf(ps, ifnum);
1686}
1687
1688static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1689{
1690 unsigned int ifnum;
1691 int ret;
1692
1693 if (get_user(ifnum, (unsigned int __user *)arg))
1694 return -EFAULT;
1695 if ((ret = releaseintf(ps, ifnum)) < 0)
1696 return ret;
1697 destroy_async_on_interface (ps, ifnum);
1698 return 0;
1699}
1700
1701static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1702{
1703 int size;
1704 void *buf = NULL;
1705 int retval = 0;
1706 struct usb_interface *intf = NULL;
1707 struct usb_driver *driver = NULL;
1708
1709 /* alloc buffer */
1710 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1711 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1712 return -ENOMEM;
1713 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1714 if (copy_from_user(buf, ctl->data, size)) {
1715 kfree(buf);
1716 return -EFAULT;
1717 }
1718 } else {
1719 memset(buf, 0, size);
1720 }
1721 }
1722
1723 if (!connected(ps)) {
1724 kfree(buf);
1725 return -ENODEV;
1726 }
1727
1728 if (ps->dev->state != USB_STATE_CONFIGURED)
1729 retval = -EHOSTUNREACH;
1730 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1731 retval = -EINVAL;
1732 else switch (ctl->ioctl_code) {
1733
1734 /* disconnect kernel driver from interface */
1735 case USBDEVFS_DISCONNECT:
1736 if (intf->dev.driver) {
1737 driver = to_usb_driver(intf->dev.driver);
1738 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1739 usb_driver_release_interface(driver, intf);
1740 } else
1741 retval = -ENODATA;
1742 break;
1743
1744 /* let kernel drivers try to (re)bind to the interface */
1745 case USBDEVFS_CONNECT:
1746 if (!intf->dev.driver)
1747 retval = device_attach(&intf->dev);
1748 else
1749 retval = -EBUSY;
1750 break;
1751
1752 /* talk directly to the interface's driver */
1753 default:
1754 if (intf->dev.driver)
1755 driver = to_usb_driver(intf->dev.driver);
1756 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1757 retval = -ENOTTY;
1758 } else {
1759 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1760 if (retval == -ENOIOCTLCMD)
1761 retval = -ENOTTY;
1762 }
1763 }
1764
1765 /* cleanup and return */
1766 if (retval >= 0
1767 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1768 && size > 0
1769 && copy_to_user(ctl->data, buf, size) != 0)
1770 retval = -EFAULT;
1771
1772 kfree(buf);
1773 return retval;
1774}
1775
1776static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1777{
1778 struct usbdevfs_ioctl ctrl;
1779
1780 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1781 return -EFAULT;
1782 return proc_ioctl(ps, &ctrl);
1783}
1784
1785#ifdef CONFIG_COMPAT
1786static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1787{
1788 struct usbdevfs_ioctl32 __user *uioc;
1789 struct usbdevfs_ioctl ctrl;
1790 u32 udata;
1791
1792 uioc = compat_ptr((long)arg);
1793 if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1794 __get_user(ctrl.ifno, &uioc->ifno) ||
1795 __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1796 __get_user(udata, &uioc->data))
1797 return -EFAULT;
1798 ctrl.data = compat_ptr(udata);
1799
1800 return proc_ioctl(ps, &ctrl);
1801}
1802#endif
1803
1804static int proc_claim_port(struct dev_state *ps, void __user *arg)
1805{
1806 unsigned portnum;
1807 int rc;
1808
1809 if (get_user(portnum, (unsigned __user *) arg))
1810 return -EFAULT;
1811 rc = usb_hub_claim_port(ps->dev, portnum, ps);
1812 if (rc == 0)
1813 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1814 portnum, task_pid_nr(current), current->comm);
1815 return rc;
1816}
1817
1818static int proc_release_port(struct dev_state *ps, void __user *arg)
1819{
1820 unsigned portnum;
1821
1822 if (get_user(portnum, (unsigned __user *) arg))
1823 return -EFAULT;
1824 return usb_hub_release_port(ps->dev, portnum, ps);
1825}
1826
1827/*
1828 * NOTE: All requests here that have interface numbers as parameters
1829 * are assuming that somehow the configuration has been prevented from
1830 * changing. But there's no mechanism to ensure that...
1831 */
1832static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1833 void __user *p)
1834{
1835 struct dev_state *ps = file->private_data;
1836 struct inode *inode = file->f_path.dentry->d_inode;
1837 struct usb_device *dev = ps->dev;
1838 int ret = -ENOTTY;
1839
1840 if (!(file->f_mode & FMODE_WRITE))
1841 return -EPERM;
1842
1843 usb_lock_device(dev);
1844 if (!connected(ps)) {
1845 usb_unlock_device(dev);
1846 return -ENODEV;
1847 }
1848
1849 switch (cmd) {
1850 case USBDEVFS_CONTROL:
1851 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1852 ret = proc_control(ps, p);
1853 if (ret >= 0)
1854 inode->i_mtime = CURRENT_TIME;
1855 break;
1856
1857 case USBDEVFS_BULK:
1858 snoop(&dev->dev, "%s: BULK\n", __func__);
1859 ret = proc_bulk(ps, p);
1860 if (ret >= 0)
1861 inode->i_mtime = CURRENT_TIME;
1862 break;
1863
1864 case USBDEVFS_RESETEP:
1865 snoop(&dev->dev, "%s: RESETEP\n", __func__);
1866 ret = proc_resetep(ps, p);
1867 if (ret >= 0)
1868 inode->i_mtime = CURRENT_TIME;
1869 break;
1870
1871 case USBDEVFS_RESET:
1872 snoop(&dev->dev, "%s: RESET\n", __func__);
1873 ret = proc_resetdevice(ps);
1874 break;
1875
1876 case USBDEVFS_CLEAR_HALT:
1877 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
1878 ret = proc_clearhalt(ps, p);
1879 if (ret >= 0)
1880 inode->i_mtime = CURRENT_TIME;
1881 break;
1882
1883 case USBDEVFS_GETDRIVER:
1884 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
1885 ret = proc_getdriver(ps, p);
1886 break;
1887
1888 case USBDEVFS_CONNECTINFO:
1889 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
1890 ret = proc_connectinfo(ps, p);
1891 break;
1892
1893 case USBDEVFS_SETINTERFACE:
1894 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
1895 ret = proc_setintf(ps, p);
1896 break;
1897
1898 case USBDEVFS_SETCONFIGURATION:
1899 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
1900 ret = proc_setconfig(ps, p);
1901 break;
1902
1903 case USBDEVFS_SUBMITURB:
1904 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
1905 ret = proc_submiturb(ps, p);
1906 if (ret >= 0)
1907 inode->i_mtime = CURRENT_TIME;
1908 break;
1909
1910#ifdef CONFIG_COMPAT
1911 case USBDEVFS_CONTROL32:
1912 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
1913 ret = proc_control_compat(ps, p);
1914 if (ret >= 0)
1915 inode->i_mtime = CURRENT_TIME;
1916 break;
1917
1918 case USBDEVFS_BULK32:
1919 snoop(&dev->dev, "%s: BULK32\n", __func__);
1920 ret = proc_bulk_compat(ps, p);
1921 if (ret >= 0)
1922 inode->i_mtime = CURRENT_TIME;
1923 break;
1924
1925 case USBDEVFS_DISCSIGNAL32:
1926 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
1927 ret = proc_disconnectsignal_compat(ps, p);
1928 break;
1929
1930 case USBDEVFS_SUBMITURB32:
1931 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
1932 ret = proc_submiturb_compat(ps, p);
1933 if (ret >= 0)
1934 inode->i_mtime = CURRENT_TIME;
1935 break;
1936
1937 case USBDEVFS_REAPURB32:
1938 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
1939 ret = proc_reapurb_compat(ps, p);
1940 break;
1941
1942 case USBDEVFS_REAPURBNDELAY32:
1943 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
1944 ret = proc_reapurbnonblock_compat(ps, p);
1945 break;
1946
1947 case USBDEVFS_IOCTL32:
1948 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
1949 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
1950 break;
1951#endif
1952
1953 case USBDEVFS_DISCARDURB:
1954 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
1955 ret = proc_unlinkurb(ps, p);
1956 break;
1957
1958 case USBDEVFS_REAPURB:
1959 snoop(&dev->dev, "%s: REAPURB\n", __func__);
1960 ret = proc_reapurb(ps, p);
1961 break;
1962
1963 case USBDEVFS_REAPURBNDELAY:
1964 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
1965 ret = proc_reapurbnonblock(ps, p);
1966 break;
1967
1968 case USBDEVFS_DISCSIGNAL:
1969 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
1970 ret = proc_disconnectsignal(ps, p);
1971 break;
1972
1973 case USBDEVFS_CLAIMINTERFACE:
1974 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
1975 ret = proc_claiminterface(ps, p);
1976 break;
1977
1978 case USBDEVFS_RELEASEINTERFACE:
1979 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
1980 ret = proc_releaseinterface(ps, p);
1981 break;
1982
1983 case USBDEVFS_IOCTL:
1984 snoop(&dev->dev, "%s: IOCTL\n", __func__);
1985 ret = proc_ioctl_default(ps, p);
1986 break;
1987
1988 case USBDEVFS_CLAIM_PORT:
1989 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
1990 ret = proc_claim_port(ps, p);
1991 break;
1992
1993 case USBDEVFS_RELEASE_PORT:
1994 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
1995 ret = proc_release_port(ps, p);
1996 break;
1997 }
1998 usb_unlock_device(dev);
1999 if (ret >= 0)
2000 inode->i_atime = CURRENT_TIME;
2001 return ret;
2002}
2003
2004static long usbdev_ioctl(struct file *file, unsigned int cmd,
2005 unsigned long arg)
2006{
2007 int ret;
2008
2009 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2010
2011 return ret;
2012}
2013
2014#ifdef CONFIG_COMPAT
2015static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2016 unsigned long arg)
2017{
2018 int ret;
2019
2020 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2021
2022 return ret;
2023}
2024#endif
2025
2026/* No kernel lock - fine */
2027static unsigned int usbdev_poll(struct file *file,
2028 struct poll_table_struct *wait)
2029{
2030 struct dev_state *ps = file->private_data;
2031 unsigned int mask = 0;
2032
2033 poll_wait(file, &ps->wait, wait);
2034 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2035 mask |= POLLOUT | POLLWRNORM;
2036 if (!connected(ps))
2037 mask |= POLLERR | POLLHUP;
2038 return mask;
2039}
2040
2041const struct file_operations usbdev_file_operations = {
2042 .owner = THIS_MODULE,
2043 .llseek = usbdev_lseek,
2044 .read = usbdev_read,
2045 .poll = usbdev_poll,
2046 .unlocked_ioctl = usbdev_ioctl,
2047#ifdef CONFIG_COMPAT
2048 .compat_ioctl = usbdev_compat_ioctl,
2049#endif
2050 .open = usbdev_open,
2051 .release = usbdev_release,
2052};
2053
2054static void usbdev_remove(struct usb_device *udev)
2055{
2056 struct dev_state *ps;
2057 struct siginfo sinfo;
2058
2059 while (!list_empty(&udev->filelist)) {
2060 ps = list_entry(udev->filelist.next, struct dev_state, list);
2061 destroy_all_async(ps);
2062 wake_up_all(&ps->wait);
2063 list_del_init(&ps->list);
2064 if (ps->discsignr) {
2065 sinfo.si_signo = ps->discsignr;
2066 sinfo.si_errno = EPIPE;
2067 sinfo.si_code = SI_ASYNCIO;
2068 sinfo.si_addr = ps->disccontext;
2069 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2070 ps->disc_pid, ps->cred, ps->secid);
2071 }
2072 }
2073}
2074
2075static int usbdev_notify(struct notifier_block *self,
2076 unsigned long action, void *dev)
2077{
2078 switch (action) {
2079 case USB_DEVICE_ADD:
2080 break;
2081 case USB_DEVICE_REMOVE:
2082 usbdev_remove(dev);
2083 break;
2084 }
2085 return NOTIFY_OK;
2086}
2087
2088static struct notifier_block usbdev_nb = {
2089 .notifier_call = usbdev_notify,
2090};
2091
2092static struct cdev usb_device_cdev;
2093
2094int __init usb_devio_init(void)
2095{
2096 int retval;
2097
2098 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2099 "usb_device");
2100 if (retval) {
2101 printk(KERN_ERR "Unable to register minors for usb_device\n");
2102 goto out;
2103 }
2104 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2105 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2106 if (retval) {
2107 printk(KERN_ERR "Unable to get usb_device major %d\n",
2108 USB_DEVICE_MAJOR);
2109 goto error_cdev;
2110 }
2111 usb_register_notify(&usbdev_nb);
2112out:
2113 return retval;
2114
2115error_cdev:
2116 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2117 goto out;
2118}
2119
2120void usb_devio_cleanup(void)
2121{
2122 usb_unregister_notify(&usbdev_nb);
2123 cdev_del(&usb_device_cdev);
2124 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2125}