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(lock: &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(lock: &usbfs_memory_usage_lock, flags);
178}
179
180static int connected(struct usb_dev_state *ps)
181{
182 return (!list_empty(head: &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(bus: 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(entry: &usbm->memlist);
196 spin_unlock_irqrestore(lock: &ps->lock, flags);
197
198 hcd_buffer_free_pages(hcd, size: usbm->size,
199 addr: usbm->mem, dma: usbm->dma_handle);
200 usbfs_decrease_memory_usage(
201 amount: usbm->size + sizeof(struct usb_memory));
202 kfree(objp: usbm);
203 } else {
204 spin_unlock_irqrestore(lock: &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(lock: &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, count: &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(bus: 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 if (!(file->f_mode & FMODE_WRITE))
242 return -EPERM;
243
244 ret = usbfs_increase_memory_usage(amount: size + sizeof(struct usb_memory));
245 if (ret)
246 goto error;
247
248 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
249 if (!usbm) {
250 ret = -ENOMEM;
251 goto error_decrease_mem;
252 }
253
254 mem = hcd_buffer_alloc_pages(hcd,
255 size, GFP_USER | __GFP_NOWARN, dma: &dma_handle);
256 if (!mem) {
257 ret = -ENOMEM;
258 goto error_free_usbm;
259 }
260
261 memset(s: mem, c: 0, n: size);
262
263 usbm->mem = mem;
264 usbm->dma_handle = dma_handle;
265 usbm->size = size;
266 usbm->ps = ps;
267 usbm->vm_start = vma->vm_start;
268 usbm->vma_use_count = 1;
269 INIT_LIST_HEAD(list: &usbm->memlist);
270
271 /*
272 * In DMA-unavailable cases, hcd_buffer_alloc_pages allocates
273 * normal pages and assigns DMA_MAPPING_ERROR to dma_handle. Check
274 * whether we are in such cases, and then use remap_pfn_range (or
275 * dma_mmap_coherent) to map normal (or DMA) pages into the user
276 * space, respectively.
277 */
278 if (dma_handle == DMA_MAPPING_ERROR) {
279 if (remap_pfn_range(vma, addr: vma->vm_start,
280 virt_to_phys(address: usbm->mem) >> PAGE_SHIFT,
281 size, vma->vm_page_prot) < 0) {
282 dec_usb_memory_use_count(usbm, count: &usbm->vma_use_count);
283 return -EAGAIN;
284 }
285 } else {
286 if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
287 size)) {
288 dec_usb_memory_use_count(usbm, count: &usbm->vma_use_count);
289 return -EAGAIN;
290 }
291 }
292
293 vm_flags_set(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP);
294 vma->vm_ops = &usbdev_vm_ops;
295 vma->vm_private_data = usbm;
296
297 spin_lock_irqsave(&ps->lock, flags);
298 list_add_tail(new: &usbm->memlist, head: &ps->memory_list);
299 spin_unlock_irqrestore(lock: &ps->lock, flags);
300
301 return 0;
302
303error_free_usbm:
304 kfree(objp: usbm);
305error_decrease_mem:
306 usbfs_decrease_memory_usage(amount: size + sizeof(struct usb_memory));
307error:
308 return ret;
309}
310
311static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
312 loff_t *ppos)
313{
314 struct usb_dev_state *ps = file->private_data;
315 struct usb_device *dev = ps->dev;
316 ssize_t ret = 0;
317 unsigned len;
318 loff_t pos;
319 int i;
320
321 pos = *ppos;
322 usb_lock_device(dev);
323 if (!connected(ps)) {
324 ret = -ENODEV;
325 goto err;
326 } else if (pos < 0) {
327 ret = -EINVAL;
328 goto err;
329 }
330
331 if (pos < sizeof(struct usb_device_descriptor)) {
332 /* 18 bytes - fits on the stack */
333 struct usb_device_descriptor temp_desc;
334
335 memcpy(to: &temp_desc, from: &dev->descriptor, len: sizeof(dev->descriptor));
336 le16_to_cpus(&temp_desc.bcdUSB);
337 le16_to_cpus(&temp_desc.idVendor);
338 le16_to_cpus(&temp_desc.idProduct);
339 le16_to_cpus(&temp_desc.bcdDevice);
340
341 len = sizeof(struct usb_device_descriptor) - pos;
342 if (len > nbytes)
343 len = nbytes;
344 if (copy_to_user(to: buf, from: ((char *)&temp_desc) + pos, n: len)) {
345 ret = -EFAULT;
346 goto err;
347 }
348
349 *ppos += len;
350 buf += len;
351 nbytes -= len;
352 ret += len;
353 }
354
355 pos = sizeof(struct usb_device_descriptor);
356 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
357 struct usb_config_descriptor *config =
358 (struct usb_config_descriptor *)dev->rawdescriptors[i];
359 unsigned int length = le16_to_cpu(config->wTotalLength);
360
361 if (*ppos < pos + length) {
362
363 /* The descriptor may claim to be longer than it
364 * really is. Here is the actual allocated length. */
365 unsigned alloclen =
366 le16_to_cpu(dev->config[i].desc.wTotalLength);
367
368 len = length - (*ppos - pos);
369 if (len > nbytes)
370 len = nbytes;
371
372 /* Simply don't write (skip over) unallocated parts */
373 if (alloclen > (*ppos - pos)) {
374 alloclen -= (*ppos - pos);
375 if (copy_to_user(to: buf,
376 from: dev->rawdescriptors[i] + (*ppos - pos),
377 min(len, alloclen))) {
378 ret = -EFAULT;
379 goto err;
380 }
381 }
382
383 *ppos += len;
384 buf += len;
385 nbytes -= len;
386 ret += len;
387 }
388
389 pos += length;
390 }
391
392err:
393 usb_unlock_device(dev);
394 return ret;
395}
396
397/*
398 * async list handling
399 */
400
401static struct async *alloc_async(unsigned int numisoframes)
402{
403 struct async *as;
404
405 as = kzalloc(sizeof(struct async), GFP_KERNEL);
406 if (!as)
407 return NULL;
408 as->urb = usb_alloc_urb(iso_packets: numisoframes, GFP_KERNEL);
409 if (!as->urb) {
410 kfree(objp: as);
411 return NULL;
412 }
413 return as;
414}
415
416static void free_async(struct async *as)
417{
418 int i;
419
420 put_pid(pid: as->pid);
421 if (as->cred)
422 put_cred(cred: as->cred);
423 for (i = 0; i < as->urb->num_sgs; i++) {
424 if (sg_page(sg: &as->urb->sg[i]))
425 kfree(objp: sg_virt(sg: &as->urb->sg[i]));
426 }
427
428 kfree(objp: as->urb->sg);
429 if (as->usbm == NULL)
430 kfree(objp: as->urb->transfer_buffer);
431 else
432 dec_usb_memory_use_count(usbm: as->usbm, count: &as->usbm->urb_use_count);
433
434 kfree(objp: as->urb->setup_packet);
435 usb_free_urb(urb: as->urb);
436 usbfs_decrease_memory_usage(amount: as->mem_usage);
437 kfree(objp: as);
438}
439
440static void async_newpending(struct async *as)
441{
442 struct usb_dev_state *ps = as->ps;
443 unsigned long flags;
444
445 spin_lock_irqsave(&ps->lock, flags);
446 list_add_tail(new: &as->asynclist, head: &ps->async_pending);
447 spin_unlock_irqrestore(lock: &ps->lock, flags);
448}
449
450static void async_removepending(struct async *as)
451{
452 struct usb_dev_state *ps = as->ps;
453 unsigned long flags;
454
455 spin_lock_irqsave(&ps->lock, flags);
456 list_del_init(entry: &as->asynclist);
457 spin_unlock_irqrestore(lock: &ps->lock, flags);
458}
459
460static struct async *async_getcompleted(struct usb_dev_state *ps)
461{
462 unsigned long flags;
463 struct async *as = NULL;
464
465 spin_lock_irqsave(&ps->lock, flags);
466 if (!list_empty(head: &ps->async_completed)) {
467 as = list_entry(ps->async_completed.next, struct async,
468 asynclist);
469 list_del_init(entry: &as->asynclist);
470 }
471 spin_unlock_irqrestore(lock: &ps->lock, flags);
472 return as;
473}
474
475static struct async *async_getpending(struct usb_dev_state *ps,
476 void __user *userurb)
477{
478 struct async *as;
479
480 list_for_each_entry(as, &ps->async_pending, asynclist)
481 if (as->userurb == userurb) {
482 list_del_init(entry: &as->asynclist);
483 return as;
484 }
485
486 return NULL;
487}
488
489static void snoop_urb(struct usb_device *udev,
490 void __user *userurb, int pipe, unsigned length,
491 int timeout_or_status, enum snoop_when when,
492 unsigned char *data, unsigned data_len)
493{
494 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
495 static const char *dirs[] = {"out", "in"};
496 int ep;
497 const char *t, *d;
498
499 if (!usbfs_snoop)
500 return;
501
502 ep = usb_pipeendpoint(pipe);
503 t = types[usb_pipetype(pipe)];
504 d = dirs[!!usb_pipein(pipe)];
505
506 if (userurb) { /* Async */
507 if (when == SUBMIT)
508 dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
509 "length %u\n",
510 userurb, ep, t, d, length);
511 else
512 dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
513 "actual_length %u status %d\n",
514 userurb, ep, t, d, length,
515 timeout_or_status);
516 } else {
517 if (when == SUBMIT)
518 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
519 "timeout %d\n",
520 ep, t, d, length, timeout_or_status);
521 else
522 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
523 "status %d\n",
524 ep, t, d, length, timeout_or_status);
525 }
526
527 data_len = min(data_len, usbfs_snoop_max);
528 if (data && data_len > 0) {
529 print_hex_dump(KERN_DEBUG, prefix_str: "data: ", prefix_type: DUMP_PREFIX_NONE, rowsize: 32, groupsize: 1,
530 buf: data, len: data_len, ascii: 1);
531 }
532}
533
534static void snoop_urb_data(struct urb *urb, unsigned len)
535{
536 int i, size;
537
538 len = min(len, usbfs_snoop_max);
539 if (!usbfs_snoop || len == 0)
540 return;
541
542 if (urb->num_sgs == 0) {
543 print_hex_dump(KERN_DEBUG, prefix_str: "data: ", prefix_type: DUMP_PREFIX_NONE, rowsize: 32, groupsize: 1,
544 buf: urb->transfer_buffer, len, ascii: 1);
545 return;
546 }
547
548 for (i = 0; i < urb->num_sgs && len; i++) {
549 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
550 print_hex_dump(KERN_DEBUG, prefix_str: "data: ", prefix_type: DUMP_PREFIX_NONE, rowsize: 32, groupsize: 1,
551 buf: sg_virt(sg: &urb->sg[i]), len: size, ascii: 1);
552 len -= size;
553 }
554}
555
556static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
557{
558 unsigned i, len, size;
559
560 if (urb->number_of_packets > 0) /* Isochronous */
561 len = urb->transfer_buffer_length;
562 else /* Non-Isoc */
563 len = urb->actual_length;
564
565 if (urb->num_sgs == 0) {
566 if (copy_to_user(to: userbuffer, from: urb->transfer_buffer, n: len))
567 return -EFAULT;
568 return 0;
569 }
570
571 for (i = 0; i < urb->num_sgs && len; i++) {
572 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
573 if (copy_to_user(to: userbuffer, from: sg_virt(sg: &urb->sg[i]), n: size))
574 return -EFAULT;
575 userbuffer += size;
576 len -= size;
577 }
578
579 return 0;
580}
581
582#define AS_CONTINUATION 1
583#define AS_UNLINK 2
584
585static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
586__releases(ps->lock)
587__acquires(ps->lock)
588{
589 struct urb *urb;
590 struct async *as;
591
592 /* Mark all the pending URBs that match bulk_addr, up to but not
593 * including the first one without AS_CONTINUATION. If such an
594 * URB is encountered then a new transfer has already started so
595 * the endpoint doesn't need to be disabled; otherwise it does.
596 */
597 list_for_each_entry(as, &ps->async_pending, asynclist) {
598 if (as->bulk_addr == bulk_addr) {
599 if (as->bulk_status != AS_CONTINUATION)
600 goto rescan;
601 as->bulk_status = AS_UNLINK;
602 as->bulk_addr = 0;
603 }
604 }
605 ps->disabled_bulk_eps |= (1 << bulk_addr);
606
607 /* Now carefully unlink all the marked pending URBs */
608 rescan:
609 list_for_each_entry_reverse(as, &ps->async_pending, asynclist) {
610 if (as->bulk_status == AS_UNLINK) {
611 as->bulk_status = 0; /* Only once */
612 urb = as->urb;
613 usb_get_urb(urb);
614 spin_unlock(lock: &ps->lock); /* Allow completions */
615 usb_unlink_urb(urb);
616 usb_put_urb(urb);
617 spin_lock(lock: &ps->lock);
618 goto rescan;
619 }
620 }
621}
622
623static void async_completed(struct urb *urb)
624{
625 struct async *as = urb->context;
626 struct usb_dev_state *ps = as->ps;
627 struct pid *pid = NULL;
628 const struct cred *cred = NULL;
629 unsigned long flags;
630 sigval_t addr;
631 int signr, errno;
632
633 spin_lock_irqsave(&ps->lock, flags);
634 list_move_tail(list: &as->asynclist, head: &ps->async_completed);
635 as->status = urb->status;
636 signr = as->signr;
637 if (signr) {
638 errno = as->status;
639 addr = as->userurb_sigval;
640 pid = get_pid(pid: as->pid);
641 cred = get_cred(cred: as->cred);
642 }
643 snoop(&urb->dev->dev, "urb complete\n");
644 snoop_urb(udev: urb->dev, userurb: as->userurb, pipe: urb->pipe, length: urb->actual_length,
645 timeout_or_status: as->status, when: COMPLETE, NULL, data_len: 0);
646 if (usb_urb_dir_in(urb))
647 snoop_urb_data(urb, len: urb->actual_length);
648
649 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
650 as->status != -ENOENT)
651 cancel_bulk_urbs(ps, bulk_addr: as->bulk_addr);
652
653 wake_up(&ps->wait);
654 spin_unlock_irqrestore(lock: &ps->lock, flags);
655
656 if (signr) {
657 kill_pid_usb_asyncio(sig: signr, errno, addr, pid, cred);
658 put_pid(pid);
659 put_cred(cred);
660 }
661}
662
663static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
664{
665 struct urb *urb;
666 struct async *as;
667 unsigned long flags;
668
669 spin_lock_irqsave(&ps->lock, flags);
670 while (!list_empty(head: list)) {
671 as = list_last_entry(list, struct async, asynclist);
672 list_del_init(entry: &as->asynclist);
673 urb = as->urb;
674 usb_get_urb(urb);
675
676 /* drop the spinlock so the completion handler can run */
677 spin_unlock_irqrestore(lock: &ps->lock, flags);
678 usb_kill_urb(urb);
679 usb_put_urb(urb);
680 spin_lock_irqsave(&ps->lock, flags);
681 }
682 spin_unlock_irqrestore(lock: &ps->lock, flags);
683}
684
685static void destroy_async_on_interface(struct usb_dev_state *ps,
686 unsigned int ifnum)
687{
688 struct list_head *p, *q, hitlist;
689 unsigned long flags;
690
691 INIT_LIST_HEAD(list: &hitlist);
692 spin_lock_irqsave(&ps->lock, flags);
693 list_for_each_safe(p, q, &ps->async_pending)
694 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
695 list_move_tail(list: p, head: &hitlist);
696 spin_unlock_irqrestore(lock: &ps->lock, flags);
697 destroy_async(ps, list: &hitlist);
698}
699
700static void destroy_all_async(struct usb_dev_state *ps)
701{
702 destroy_async(ps, list: &ps->async_pending);
703}
704
705/*
706 * interface claims are made only at the request of user level code,
707 * which can also release them (explicitly or by closing files).
708 * they're also undone when devices disconnect.
709 */
710
711static int driver_probe(struct usb_interface *intf,
712 const struct usb_device_id *id)
713{
714 return -ENODEV;
715}
716
717static void driver_disconnect(struct usb_interface *intf)
718{
719 struct usb_dev_state *ps = usb_get_intfdata(intf);
720 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
721
722 if (!ps)
723 return;
724
725 /* NOTE: this relies on usbcore having canceled and completed
726 * all pending I/O requests; 2.6 does that.
727 */
728
729 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
730 clear_bit(nr: ifnum, addr: &ps->ifclaimed);
731 else
732 dev_warn(&intf->dev, "interface number %u out of range\n",
733 ifnum);
734
735 usb_set_intfdata(intf, NULL);
736
737 /* force async requests to complete */
738 destroy_async_on_interface(ps, ifnum);
739}
740
741/* We don't care about suspend/resume of claimed interfaces */
742static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
743{
744 return 0;
745}
746
747static int driver_resume(struct usb_interface *intf)
748{
749 return 0;
750}
751
752#ifdef CONFIG_PM
753/* The following routines apply to the entire device, not interfaces */
754void usbfs_notify_suspend(struct usb_device *udev)
755{
756 /* We don't need to handle this */
757}
758
759void usbfs_notify_resume(struct usb_device *udev)
760{
761 struct usb_dev_state *ps;
762
763 /* Protect against simultaneous remove or release */
764 mutex_lock(lock: &usbfs_mutex);
765 list_for_each_entry(ps, &udev->filelist, list) {
766 WRITE_ONCE(ps->not_yet_resumed, 0);
767 wake_up_all(&ps->wait_for_resume);
768 }
769 mutex_unlock(lock: &usbfs_mutex);
770}
771#endif
772
773struct usb_driver usbfs_driver = {
774 .name = "usbfs",
775 .probe = driver_probe,
776 .disconnect = driver_disconnect,
777 .suspend = driver_suspend,
778 .resume = driver_resume,
779 .supports_autosuspend = 1,
780};
781
782static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
783{
784 struct usb_device *dev = ps->dev;
785 struct usb_interface *intf;
786 int err;
787
788 if (ifnum >= 8*sizeof(ps->ifclaimed))
789 return -EINVAL;
790 /* already claimed */
791 if (test_bit(ifnum, &ps->ifclaimed))
792 return 0;
793
794 if (ps->privileges_dropped &&
795 !test_bit(ifnum, &ps->interface_allowed_mask))
796 return -EACCES;
797
798 intf = usb_ifnum_to_if(dev, ifnum);
799 if (!intf)
800 err = -ENOENT;
801 else {
802 unsigned int old_suppress;
803
804 /* suppress uevents while claiming interface */
805 old_suppress = dev_get_uevent_suppress(dev: &intf->dev);
806 dev_set_uevent_suppress(dev: &intf->dev, val: 1);
807 err = usb_driver_claim_interface(driver: &usbfs_driver, iface: intf, data: ps);
808 dev_set_uevent_suppress(dev: &intf->dev, val: old_suppress);
809 }
810 if (err == 0)
811 set_bit(nr: ifnum, addr: &ps->ifclaimed);
812 return err;
813}
814
815static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
816{
817 struct usb_device *dev;
818 struct usb_interface *intf;
819 int err;
820
821 err = -EINVAL;
822 if (ifnum >= 8*sizeof(ps->ifclaimed))
823 return err;
824 dev = ps->dev;
825 intf = usb_ifnum_to_if(dev, ifnum);
826 if (!intf)
827 err = -ENOENT;
828 else if (test_and_clear_bit(nr: ifnum, addr: &ps->ifclaimed)) {
829 unsigned int old_suppress;
830
831 /* suppress uevents while releasing interface */
832 old_suppress = dev_get_uevent_suppress(dev: &intf->dev);
833 dev_set_uevent_suppress(dev: &intf->dev, val: 1);
834 usb_driver_release_interface(driver: &usbfs_driver, iface: intf);
835 dev_set_uevent_suppress(dev: &intf->dev, val: old_suppress);
836 err = 0;
837 }
838 return err;
839}
840
841static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
842{
843 if (ps->dev->state != USB_STATE_CONFIGURED)
844 return -EHOSTUNREACH;
845 if (ifnum >= 8*sizeof(ps->ifclaimed))
846 return -EINVAL;
847 if (test_bit(ifnum, &ps->ifclaimed))
848 return 0;
849 /* if not yet claimed, claim it for the driver */
850 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
851 "interface %u before use\n", task_pid_nr(current),
852 current->comm, ifnum);
853 return claimintf(ps, ifnum);
854}
855
856static int findintfep(struct usb_device *dev, unsigned int ep)
857{
858 unsigned int i, j, e;
859 struct usb_interface *intf;
860 struct usb_host_interface *alts;
861 struct usb_endpoint_descriptor *endpt;
862
863 if (ep & ~(USB_DIR_IN|0xf))
864 return -EINVAL;
865 if (!dev->actconfig)
866 return -ESRCH;
867 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
868 intf = dev->actconfig->interface[i];
869 for (j = 0; j < intf->num_altsetting; j++) {
870 alts = &intf->altsetting[j];
871 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
872 endpt = &alts->endpoint[e].desc;
873 if (endpt->bEndpointAddress == ep)
874 return alts->desc.bInterfaceNumber;
875 }
876 }
877 }
878 return -ENOENT;
879}
880
881static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
882 unsigned int request, unsigned int index)
883{
884 int ret = 0;
885 struct usb_host_interface *alt_setting;
886
887 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
888 && ps->dev->state != USB_STATE_ADDRESS
889 && ps->dev->state != USB_STATE_CONFIGURED)
890 return -EHOSTUNREACH;
891 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
892 return 0;
893
894 /*
895 * check for the special corner case 'get_device_id' in the printer
896 * class specification, which we always want to allow as it is used
897 * to query things like ink level, etc.
898 */
899 if (requesttype == 0xa1 && request == 0) {
900 alt_setting = usb_find_alt_setting(config: ps->dev->actconfig,
901 iface_num: index >> 8, alt_num: index & 0xff);
902 if (alt_setting
903 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
904 return 0;
905 }
906
907 index &= 0xff;
908 switch (requesttype & USB_RECIP_MASK) {
909 case USB_RECIP_ENDPOINT:
910 if ((index & ~USB_DIR_IN) == 0)
911 return 0;
912 ret = findintfep(dev: ps->dev, ep: index);
913 if (ret < 0) {
914 /*
915 * Some not fully compliant Win apps seem to get
916 * index wrong and have the endpoint number here
917 * rather than the endpoint address (with the
918 * correct direction). Win does let this through,
919 * so we'll not reject it here but leave it to
920 * the device to not break KVM. But we warn.
921 */
922 ret = findintfep(dev: ps->dev, ep: index ^ 0x80);
923 if (ret >= 0)
924 dev_info(&ps->dev->dev,
925 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
926 __func__, task_pid_nr(current),
927 current->comm, index, index ^ 0x80);
928 }
929 if (ret >= 0)
930 ret = checkintf(ps, ifnum: ret);
931 break;
932
933 case USB_RECIP_INTERFACE:
934 ret = checkintf(ps, ifnum: index);
935 break;
936 }
937 return ret;
938}
939
940static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
941 unsigned char ep)
942{
943 if (ep & USB_ENDPOINT_DIR_MASK)
944 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
945 else
946 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
947}
948
949static int parse_usbdevfs_streams(struct usb_dev_state *ps,
950 struct usbdevfs_streams __user *streams,
951 unsigned int *num_streams_ret,
952 unsigned int *num_eps_ret,
953 struct usb_host_endpoint ***eps_ret,
954 struct usb_interface **intf_ret)
955{
956 unsigned int i, num_streams, num_eps;
957 struct usb_host_endpoint **eps;
958 struct usb_interface *intf = NULL;
959 unsigned char ep;
960 int ifnum, ret;
961
962 if (get_user(num_streams, &streams->num_streams) ||
963 get_user(num_eps, &streams->num_eps))
964 return -EFAULT;
965
966 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
967 return -EINVAL;
968
969 /* The XHCI controller allows max 2 ^ 16 streams */
970 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
971 return -EINVAL;
972
973 eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
974 if (!eps)
975 return -ENOMEM;
976
977 for (i = 0; i < num_eps; i++) {
978 if (get_user(ep, &streams->eps[i])) {
979 ret = -EFAULT;
980 goto error;
981 }
982 eps[i] = ep_to_host_endpoint(dev: ps->dev, ep);
983 if (!eps[i]) {
984 ret = -EINVAL;
985 goto error;
986 }
987
988 /* usb_alloc/free_streams operate on an usb_interface */
989 ifnum = findintfep(dev: ps->dev, ep);
990 if (ifnum < 0) {
991 ret = ifnum;
992 goto error;
993 }
994
995 if (i == 0) {
996 ret = checkintf(ps, ifnum);
997 if (ret < 0)
998 goto error;
999 intf = usb_ifnum_to_if(dev: ps->dev, ifnum);
1000 } else {
1001 /* Verify all eps belong to the same interface */
1002 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
1003 ret = -EINVAL;
1004 goto error;
1005 }
1006 }
1007 }
1008
1009 if (num_streams_ret)
1010 *num_streams_ret = num_streams;
1011 *num_eps_ret = num_eps;
1012 *eps_ret = eps;
1013 *intf_ret = intf;
1014
1015 return 0;
1016
1017error:
1018 kfree(objp: eps);
1019 return ret;
1020}
1021
1022static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
1023{
1024 struct device *dev;
1025
1026 dev = bus_find_device_by_devt(bus: &usb_bus_type, devt);
1027 if (!dev)
1028 return NULL;
1029 return to_usb_device(dev);
1030}
1031
1032/*
1033 * file operations
1034 */
1035static int usbdev_open(struct inode *inode, struct file *file)
1036{
1037 struct usb_device *dev = NULL;
1038 struct usb_dev_state *ps;
1039 int ret;
1040
1041 ret = -ENOMEM;
1042 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
1043 if (!ps)
1044 goto out_free_ps;
1045
1046 ret = -ENODEV;
1047
1048 /* usbdev device-node */
1049 if (imajor(inode) == USB_DEVICE_MAJOR)
1050 dev = usbdev_lookup_by_devt(devt: inode->i_rdev);
1051 if (!dev)
1052 goto out_free_ps;
1053
1054 usb_lock_device(dev);
1055 if (dev->state == USB_STATE_NOTATTACHED)
1056 goto out_unlock_device;
1057
1058 ret = usb_autoresume_device(udev: dev);
1059 if (ret)
1060 goto out_unlock_device;
1061
1062 ps->dev = dev;
1063 ps->file = file;
1064 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1065 spin_lock_init(&ps->lock);
1066 INIT_LIST_HEAD(list: &ps->list);
1067 INIT_LIST_HEAD(list: &ps->async_pending);
1068 INIT_LIST_HEAD(list: &ps->async_completed);
1069 INIT_LIST_HEAD(list: &ps->memory_list);
1070 init_waitqueue_head(&ps->wait);
1071 init_waitqueue_head(&ps->wait_for_resume);
1072 ps->disc_pid = get_pid(pid: task_pid(current));
1073 ps->cred = get_current_cred();
1074 smp_wmb();
1075
1076 /* Can't race with resume; the device is already active */
1077 list_add_tail(new: &ps->list, head: &dev->filelist);
1078 file->private_data = ps;
1079 usb_unlock_device(dev);
1080 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1081 current->comm);
1082 return ret;
1083
1084 out_unlock_device:
1085 usb_unlock_device(dev);
1086 usb_put_dev(dev);
1087 out_free_ps:
1088 kfree(objp: ps);
1089 return ret;
1090}
1091
1092static int usbdev_release(struct inode *inode, struct file *file)
1093{
1094 struct usb_dev_state *ps = file->private_data;
1095 struct usb_device *dev = ps->dev;
1096 unsigned int ifnum;
1097 struct async *as;
1098
1099 usb_lock_device(dev);
1100 usb_hub_release_all_ports(hdev: dev, owner: ps);
1101
1102 /* Protect against simultaneous resume */
1103 mutex_lock(lock: &usbfs_mutex);
1104 list_del_init(entry: &ps->list);
1105 mutex_unlock(lock: &usbfs_mutex);
1106
1107 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1108 ifnum++) {
1109 if (test_bit(ifnum, &ps->ifclaimed))
1110 releaseintf(ps, ifnum);
1111 }
1112 destroy_all_async(ps);
1113 if (!ps->suspend_allowed)
1114 usb_autosuspend_device(udev: dev);
1115 usb_unlock_device(dev);
1116 usb_put_dev(dev);
1117 put_pid(pid: ps->disc_pid);
1118 put_cred(cred: ps->cred);
1119
1120 as = async_getcompleted(ps);
1121 while (as) {
1122 free_async(as);
1123 as = async_getcompleted(ps);
1124 }
1125
1126 kfree(objp: ps);
1127 return 0;
1128}
1129
1130static void usbfs_blocking_completion(struct urb *urb)
1131{
1132 complete((struct completion *) urb->context);
1133}
1134
1135/*
1136 * Much like usb_start_wait_urb, but returns status separately from
1137 * actual_length and uses a killable wait.
1138 */
1139static int usbfs_start_wait_urb(struct urb *urb, int timeout,
1140 unsigned int *actlen)
1141{
1142 DECLARE_COMPLETION_ONSTACK(ctx);
1143 unsigned long expire;
1144 int rc;
1145
1146 urb->context = &ctx;
1147 urb->complete = usbfs_blocking_completion;
1148 *actlen = 0;
1149 rc = usb_submit_urb(urb, GFP_KERNEL);
1150 if (unlikely(rc))
1151 return rc;
1152
1153 expire = (timeout ? msecs_to_jiffies(m: timeout) : MAX_SCHEDULE_TIMEOUT);
1154 rc = wait_for_completion_killable_timeout(x: &ctx, timeout: expire);
1155 if (rc <= 0) {
1156 usb_kill_urb(urb);
1157 *actlen = urb->actual_length;
1158 if (urb->status != -ENOENT)
1159 ; /* Completed before it was killed */
1160 else if (rc < 0)
1161 return -EINTR;
1162 else
1163 return -ETIMEDOUT;
1164 }
1165 *actlen = urb->actual_length;
1166 return urb->status;
1167}
1168
1169static int do_proc_control(struct usb_dev_state *ps,
1170 struct usbdevfs_ctrltransfer *ctrl)
1171{
1172 struct usb_device *dev = ps->dev;
1173 unsigned int tmo;
1174 unsigned char *tbuf;
1175 unsigned int wLength, actlen;
1176 int i, pipe, ret;
1177 struct urb *urb = NULL;
1178 struct usb_ctrlrequest *dr = NULL;
1179
1180 ret = check_ctrlrecip(ps, requesttype: ctrl->bRequestType, request: ctrl->bRequest,
1181 index: ctrl->wIndex);
1182 if (ret)
1183 return ret;
1184 wLength = ctrl->wLength; /* To suppress 64k PAGE_SIZE warning */
1185 if (wLength > PAGE_SIZE)
1186 return -EINVAL;
1187 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1188 sizeof(struct usb_ctrlrequest));
1189 if (ret)
1190 return ret;
1191
1192 ret = -ENOMEM;
1193 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1194 if (!tbuf)
1195 goto done;
1196 urb = usb_alloc_urb(iso_packets: 0, GFP_NOIO);
1197 if (!urb)
1198 goto done;
1199 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_NOIO);
1200 if (!dr)
1201 goto done;
1202
1203 dr->bRequestType = ctrl->bRequestType;
1204 dr->bRequest = ctrl->bRequest;
1205 dr->wValue = cpu_to_le16(ctrl->wValue);
1206 dr->wIndex = cpu_to_le16(ctrl->wIndex);
1207 dr->wLength = cpu_to_le16(ctrl->wLength);
1208
1209 tmo = ctrl->timeout;
1210 snoop(&dev->dev, "control urb: bRequestType=%02x "
1211 "bRequest=%02x wValue=%04x "
1212 "wIndex=%04x wLength=%04x\n",
1213 ctrl->bRequestType, ctrl->bRequest, ctrl->wValue,
1214 ctrl->wIndex, ctrl->wLength);
1215
1216 if ((ctrl->bRequestType & USB_DIR_IN) && wLength) {
1217 pipe = usb_rcvctrlpipe(dev, 0);
1218 usb_fill_control_urb(urb, dev, pipe, setup_packet: (unsigned char *) dr, transfer_buffer: tbuf,
1219 buffer_length: wLength, NULL, NULL);
1220 snoop_urb(udev: dev, NULL, pipe, length: wLength, timeout_or_status: tmo, when: SUBMIT, NULL, data_len: 0);
1221
1222 usb_unlock_device(dev);
1223 i = usbfs_start_wait_urb(urb, timeout: tmo, actlen: &actlen);
1224
1225 /* Linger a bit, prior to the next control message. */
1226 if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1227 msleep(msecs: 200);
1228 usb_lock_device(dev);
1229 snoop_urb(udev: dev, NULL, pipe, length: actlen, timeout_or_status: i, when: COMPLETE, data: tbuf, data_len: actlen);
1230 if (!i && actlen) {
1231 if (copy_to_user(to: ctrl->data, from: tbuf, n: actlen)) {
1232 ret = -EFAULT;
1233 goto done;
1234 }
1235 }
1236 } else {
1237 if (wLength) {
1238 if (copy_from_user(to: tbuf, from: ctrl->data, n: wLength)) {
1239 ret = -EFAULT;
1240 goto done;
1241 }
1242 }
1243 pipe = usb_sndctrlpipe(dev, 0);
1244 usb_fill_control_urb(urb, dev, pipe, setup_packet: (unsigned char *) dr, transfer_buffer: tbuf,
1245 buffer_length: wLength, NULL, NULL);
1246 snoop_urb(udev: dev, NULL, pipe, length: wLength, timeout_or_status: tmo, when: SUBMIT, data: tbuf, data_len: wLength);
1247
1248 usb_unlock_device(dev);
1249 i = usbfs_start_wait_urb(urb, timeout: tmo, actlen: &actlen);
1250
1251 /* Linger a bit, prior to the next control message. */
1252 if (dev->quirks & USB_QUIRK_DELAY_CTRL_MSG)
1253 msleep(msecs: 200);
1254 usb_lock_device(dev);
1255 snoop_urb(udev: dev, NULL, pipe, length: actlen, timeout_or_status: i, when: COMPLETE, NULL, data_len: 0);
1256 }
1257 if (i < 0 && i != -EPIPE) {
1258 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1259 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1260 current->comm, ctrl->bRequestType, ctrl->bRequest,
1261 ctrl->wLength, i);
1262 }
1263 ret = (i < 0 ? i : actlen);
1264
1265 done:
1266 kfree(objp: dr);
1267 usb_free_urb(urb);
1268 free_page((unsigned long) tbuf);
1269 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1270 sizeof(struct usb_ctrlrequest));
1271 return ret;
1272}
1273
1274static int proc_control(struct usb_dev_state *ps, void __user *arg)
1275{
1276 struct usbdevfs_ctrltransfer ctrl;
1277
1278 if (copy_from_user(to: &ctrl, from: arg, n: sizeof(ctrl)))
1279 return -EFAULT;
1280 return do_proc_control(ps, ctrl: &ctrl);
1281}
1282
1283static int do_proc_bulk(struct usb_dev_state *ps,
1284 struct usbdevfs_bulktransfer *bulk)
1285{
1286 struct usb_device *dev = ps->dev;
1287 unsigned int tmo, len1, len2, pipe;
1288 unsigned char *tbuf;
1289 int i, ret;
1290 struct urb *urb = NULL;
1291 struct usb_host_endpoint *ep;
1292
1293 ret = findintfep(dev: ps->dev, ep: bulk->ep);
1294 if (ret < 0)
1295 return ret;
1296 ret = checkintf(ps, ifnum: ret);
1297 if (ret)
1298 return ret;
1299
1300 len1 = bulk->len;
1301 if (len1 >= (INT_MAX - sizeof(struct urb)))
1302 return -EINVAL;
1303
1304 if (bulk->ep & USB_DIR_IN)
1305 pipe = usb_rcvbulkpipe(dev, bulk->ep & 0x7f);
1306 else
1307 pipe = usb_sndbulkpipe(dev, bulk->ep & 0x7f);
1308 ep = usb_pipe_endpoint(dev, pipe);
1309 if (!ep || !usb_endpoint_maxp(epd: &ep->desc))
1310 return -EINVAL;
1311 ret = usbfs_increase_memory_usage(amount: len1 + sizeof(struct urb));
1312 if (ret)
1313 return ret;
1314
1315 /*
1316 * len1 can be almost arbitrarily large. Don't WARN if it's
1317 * too big, just fail the request.
1318 */
1319 ret = -ENOMEM;
1320 tbuf = kmalloc(len1, GFP_KERNEL | __GFP_NOWARN);
1321 if (!tbuf)
1322 goto done;
1323 urb = usb_alloc_urb(iso_packets: 0, GFP_KERNEL);
1324 if (!urb)
1325 goto done;
1326
1327 if ((ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
1328 USB_ENDPOINT_XFER_INT) {
1329 pipe = (pipe & ~(3 << 30)) | (PIPE_INTERRUPT << 30);
1330 usb_fill_int_urb(urb, dev, pipe, transfer_buffer: tbuf, buffer_length: len1,
1331 NULL, NULL, interval: ep->desc.bInterval);
1332 } else {
1333 usb_fill_bulk_urb(urb, dev, pipe, transfer_buffer: tbuf, buffer_length: len1, NULL, NULL);
1334 }
1335
1336 tmo = bulk->timeout;
1337 if (bulk->ep & 0x80) {
1338 snoop_urb(udev: dev, NULL, pipe, length: len1, timeout_or_status: tmo, when: SUBMIT, NULL, data_len: 0);
1339
1340 usb_unlock_device(dev);
1341 i = usbfs_start_wait_urb(urb, timeout: tmo, actlen: &len2);
1342 usb_lock_device(dev);
1343 snoop_urb(udev: dev, NULL, pipe, length: len2, timeout_or_status: i, when: COMPLETE, data: tbuf, data_len: len2);
1344
1345 if (!i && len2) {
1346 if (copy_to_user(to: bulk->data, from: tbuf, n: len2)) {
1347 ret = -EFAULT;
1348 goto done;
1349 }
1350 }
1351 } else {
1352 if (len1) {
1353 if (copy_from_user(to: tbuf, from: bulk->data, n: len1)) {
1354 ret = -EFAULT;
1355 goto done;
1356 }
1357 }
1358 snoop_urb(udev: dev, NULL, pipe, length: len1, timeout_or_status: tmo, when: SUBMIT, data: tbuf, data_len: len1);
1359
1360 usb_unlock_device(dev);
1361 i = usbfs_start_wait_urb(urb, timeout: tmo, actlen: &len2);
1362 usb_lock_device(dev);
1363 snoop_urb(udev: dev, NULL, pipe, length: len2, timeout_or_status: i, when: COMPLETE, NULL, data_len: 0);
1364 }
1365 ret = (i < 0 ? i : len2);
1366 done:
1367 usb_free_urb(urb);
1368 kfree(objp: tbuf);
1369 usbfs_decrease_memory_usage(amount: len1 + sizeof(struct urb));
1370 return ret;
1371}
1372
1373static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1374{
1375 struct usbdevfs_bulktransfer bulk;
1376
1377 if (copy_from_user(to: &bulk, from: arg, n: sizeof(bulk)))
1378 return -EFAULT;
1379 return do_proc_bulk(ps, bulk: &bulk);
1380}
1381
1382static void check_reset_of_active_ep(struct usb_device *udev,
1383 unsigned int epnum, char *ioctl_name)
1384{
1385 struct usb_host_endpoint **eps;
1386 struct usb_host_endpoint *ep;
1387
1388 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1389 ep = eps[epnum & 0x0f];
1390 if (ep && !list_empty(head: &ep->urb_list))
1391 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1392 task_pid_nr(current), current->comm,
1393 ioctl_name, epnum);
1394}
1395
1396static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1397{
1398 unsigned int ep;
1399 int ret;
1400
1401 if (get_user(ep, (unsigned int __user *)arg))
1402 return -EFAULT;
1403 ret = findintfep(dev: ps->dev, ep);
1404 if (ret < 0)
1405 return ret;
1406 ret = checkintf(ps, ifnum: ret);
1407 if (ret)
1408 return ret;
1409 check_reset_of_active_ep(udev: ps->dev, epnum: ep, ioctl_name: "RESETEP");
1410 usb_reset_endpoint(dev: ps->dev, epaddr: ep);
1411 return 0;
1412}
1413
1414static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1415{
1416 unsigned int ep;
1417 int pipe;
1418 int ret;
1419
1420 if (get_user(ep, (unsigned int __user *)arg))
1421 return -EFAULT;
1422 ret = findintfep(dev: ps->dev, ep);
1423 if (ret < 0)
1424 return ret;
1425 ret = checkintf(ps, ifnum: ret);
1426 if (ret)
1427 return ret;
1428 check_reset_of_active_ep(udev: ps->dev, epnum: ep, ioctl_name: "CLEAR_HALT");
1429 if (ep & USB_DIR_IN)
1430 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1431 else
1432 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1433
1434 return usb_clear_halt(dev: ps->dev, pipe);
1435}
1436
1437static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1438{
1439 struct usbdevfs_getdriver gd;
1440 struct usb_interface *intf;
1441 int ret;
1442
1443 if (copy_from_user(to: &gd, from: arg, n: sizeof(gd)))
1444 return -EFAULT;
1445 intf = usb_ifnum_to_if(dev: ps->dev, ifnum: gd.interface);
1446 if (!intf || !intf->dev.driver)
1447 ret = -ENODATA;
1448 else {
1449 strscpy(gd.driver, intf->dev.driver->name,
1450 sizeof(gd.driver));
1451 ret = (copy_to_user(to: arg, from: &gd, n: sizeof(gd)) ? -EFAULT : 0);
1452 }
1453 return ret;
1454}
1455
1456static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1457{
1458 struct usbdevfs_connectinfo ci;
1459
1460 memset(s: &ci, c: 0, n: sizeof(ci));
1461 ci.devnum = ps->dev->devnum;
1462 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1463
1464 if (copy_to_user(to: arg, from: &ci, n: sizeof(ci)))
1465 return -EFAULT;
1466 return 0;
1467}
1468
1469static int proc_conninfo_ex(struct usb_dev_state *ps,
1470 void __user *arg, size_t size)
1471{
1472 struct usbdevfs_conninfo_ex ci;
1473 struct usb_device *udev = ps->dev;
1474
1475 if (size < sizeof(ci.size))
1476 return -EINVAL;
1477
1478 memset(s: &ci, c: 0, n: sizeof(ci));
1479 ci.size = sizeof(ci);
1480 ci.busnum = udev->bus->busnum;
1481 ci.devnum = udev->devnum;
1482 ci.speed = udev->speed;
1483
1484 while (udev && udev->portnum != 0) {
1485 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1486 ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1487 udev->portnum;
1488 udev = udev->parent;
1489 }
1490
1491 if (ci.num_ports < ARRAY_SIZE(ci.ports))
1492 memmove(dest: &ci.ports[0],
1493 src: &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1494 count: ci.num_ports);
1495
1496 if (copy_to_user(to: arg, from: &ci, min(sizeof(ci), size)))
1497 return -EFAULT;
1498
1499 return 0;
1500}
1501
1502static int proc_resetdevice(struct usb_dev_state *ps)
1503{
1504 struct usb_host_config *actconfig = ps->dev->actconfig;
1505 struct usb_interface *interface;
1506 int i, number;
1507
1508 /* Don't allow a device reset if the process has dropped the
1509 * privilege to do such things and any of the interfaces are
1510 * currently claimed.
1511 */
1512 if (ps->privileges_dropped && actconfig) {
1513 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1514 interface = actconfig->interface[i];
1515 number = interface->cur_altsetting->desc.bInterfaceNumber;
1516 if (usb_interface_claimed(iface: interface) &&
1517 !test_bit(number, &ps->ifclaimed)) {
1518 dev_warn(&ps->dev->dev,
1519 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1520 number, interface->dev.driver->name, current->comm);
1521 return -EACCES;
1522 }
1523 }
1524 }
1525
1526 return usb_reset_device(dev: ps->dev);
1527}
1528
1529static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1530{
1531 struct usbdevfs_setinterface setintf;
1532 int ret;
1533
1534 if (copy_from_user(to: &setintf, from: arg, n: sizeof(setintf)))
1535 return -EFAULT;
1536 ret = checkintf(ps, ifnum: setintf.interface);
1537 if (ret)
1538 return ret;
1539
1540 destroy_async_on_interface(ps, ifnum: setintf.interface);
1541
1542 return usb_set_interface(dev: ps->dev, ifnum: setintf.interface,
1543 alternate: setintf.altsetting);
1544}
1545
1546static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1547{
1548 int u;
1549 int status = 0;
1550 struct usb_host_config *actconfig;
1551
1552 if (get_user(u, (int __user *)arg))
1553 return -EFAULT;
1554
1555 actconfig = ps->dev->actconfig;
1556
1557 /* Don't touch the device if any interfaces are claimed.
1558 * It could interfere with other drivers' operations, and if
1559 * an interface is claimed by usbfs it could easily deadlock.
1560 */
1561 if (actconfig) {
1562 int i;
1563
1564 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1565 if (usb_interface_claimed(iface: actconfig->interface[i])) {
1566 dev_warn(&ps->dev->dev,
1567 "usbfs: interface %d claimed by %s "
1568 "while '%s' sets config #%d\n",
1569 actconfig->interface[i]
1570 ->cur_altsetting
1571 ->desc.bInterfaceNumber,
1572 actconfig->interface[i]
1573 ->dev.driver->name,
1574 current->comm, u);
1575 status = -EBUSY;
1576 break;
1577 }
1578 }
1579 }
1580
1581 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1582 * so avoid usb_set_configuration()'s kick to sysfs
1583 */
1584 if (status == 0) {
1585 if (actconfig && actconfig->desc.bConfigurationValue == u)
1586 status = usb_reset_configuration(dev: ps->dev);
1587 else
1588 status = usb_set_configuration(dev: ps->dev, configuration: u);
1589 }
1590
1591 return status;
1592}
1593
1594static struct usb_memory *
1595find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1596{
1597 struct usb_memory *usbm = NULL, *iter;
1598 unsigned long flags;
1599 unsigned long uurb_start = (unsigned long)uurb->buffer;
1600
1601 spin_lock_irqsave(&ps->lock, flags);
1602 list_for_each_entry(iter, &ps->memory_list, memlist) {
1603 if (uurb_start >= iter->vm_start &&
1604 uurb_start < iter->vm_start + iter->size) {
1605 if (uurb->buffer_length > iter->vm_start + iter->size -
1606 uurb_start) {
1607 usbm = ERR_PTR(error: -EINVAL);
1608 } else {
1609 usbm = iter;
1610 usbm->urb_use_count++;
1611 }
1612 break;
1613 }
1614 }
1615 spin_unlock_irqrestore(lock: &ps->lock, flags);
1616 return usbm;
1617}
1618
1619static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1620 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1621 void __user *arg, sigval_t userurb_sigval)
1622{
1623 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1624 struct usb_host_endpoint *ep;
1625 struct async *as = NULL;
1626 struct usb_ctrlrequest *dr = NULL;
1627 unsigned int u, totlen, isofrmlen;
1628 int i, ret, num_sgs = 0, ifnum = -1;
1629 int number_of_packets = 0;
1630 unsigned int stream_id = 0;
1631 void *buf;
1632 bool is_in;
1633 bool allow_short = false;
1634 bool allow_zero = false;
1635 unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
1636 USBDEVFS_URB_BULK_CONTINUATION |
1637 USBDEVFS_URB_NO_FSBR |
1638 USBDEVFS_URB_ZERO_PACKET |
1639 USBDEVFS_URB_NO_INTERRUPT;
1640 /* USBDEVFS_URB_ISO_ASAP is a special case */
1641 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1642 mask |= USBDEVFS_URB_ISO_ASAP;
1643
1644 if (uurb->flags & ~mask)
1645 return -EINVAL;
1646
1647 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1648 return -EINVAL;
1649 if (uurb->buffer_length > 0 && !uurb->buffer)
1650 return -EINVAL;
1651 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1652 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1653 ifnum = findintfep(dev: ps->dev, ep: uurb->endpoint);
1654 if (ifnum < 0)
1655 return ifnum;
1656 ret = checkintf(ps, ifnum);
1657 if (ret)
1658 return ret;
1659 }
1660 ep = ep_to_host_endpoint(dev: ps->dev, ep: uurb->endpoint);
1661 if (!ep)
1662 return -ENOENT;
1663 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1664
1665 u = 0;
1666 switch (uurb->type) {
1667 case USBDEVFS_URB_TYPE_CONTROL:
1668 if (!usb_endpoint_xfer_control(epd: &ep->desc))
1669 return -EINVAL;
1670 /* min 8 byte setup packet */
1671 if (uurb->buffer_length < 8)
1672 return -EINVAL;
1673 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1674 if (!dr)
1675 return -ENOMEM;
1676 if (copy_from_user(to: dr, from: uurb->buffer, n: 8)) {
1677 ret = -EFAULT;
1678 goto error;
1679 }
1680 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1681 ret = -EINVAL;
1682 goto error;
1683 }
1684 ret = check_ctrlrecip(ps, requesttype: dr->bRequestType, request: dr->bRequest,
1685 le16_to_cpu(dr->wIndex));
1686 if (ret)
1687 goto error;
1688 uurb->buffer_length = le16_to_cpu(dr->wLength);
1689 uurb->buffer += 8;
1690 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1691 is_in = true;
1692 uurb->endpoint |= USB_DIR_IN;
1693 } else {
1694 is_in = false;
1695 uurb->endpoint &= ~USB_DIR_IN;
1696 }
1697 if (is_in)
1698 allow_short = true;
1699 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1700 "bRequest=%02x wValue=%04x "
1701 "wIndex=%04x wLength=%04x\n",
1702 dr->bRequestType, dr->bRequest,
1703 __le16_to_cpu(dr->wValue),
1704 __le16_to_cpu(dr->wIndex),
1705 __le16_to_cpu(dr->wLength));
1706 u = sizeof(struct usb_ctrlrequest);
1707 break;
1708
1709 case USBDEVFS_URB_TYPE_BULK:
1710 if (!is_in)
1711 allow_zero = true;
1712 else
1713 allow_short = true;
1714 switch (usb_endpoint_type(epd: &ep->desc)) {
1715 case USB_ENDPOINT_XFER_CONTROL:
1716 case USB_ENDPOINT_XFER_ISOC:
1717 return -EINVAL;
1718 case USB_ENDPOINT_XFER_INT:
1719 /* allow single-shot interrupt transfers */
1720 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1721 goto interrupt_urb;
1722 }
1723 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1724 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1725 num_sgs = 0;
1726 if (ep->streams)
1727 stream_id = uurb->stream_id;
1728 break;
1729
1730 case USBDEVFS_URB_TYPE_INTERRUPT:
1731 if (!usb_endpoint_xfer_int(epd: &ep->desc))
1732 return -EINVAL;
1733 interrupt_urb:
1734 if (!is_in)
1735 allow_zero = true;
1736 else
1737 allow_short = true;
1738 break;
1739
1740 case USBDEVFS_URB_TYPE_ISO:
1741 /* arbitrary limit */
1742 if (uurb->number_of_packets < 1 ||
1743 uurb->number_of_packets > 128)
1744 return -EINVAL;
1745 if (!usb_endpoint_xfer_isoc(epd: &ep->desc))
1746 return -EINVAL;
1747 number_of_packets = uurb->number_of_packets;
1748 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1749 number_of_packets;
1750 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1751 if (IS_ERR(ptr: isopkt)) {
1752 ret = PTR_ERR(ptr: isopkt);
1753 isopkt = NULL;
1754 goto error;
1755 }
1756 for (totlen = u = 0; u < number_of_packets; u++) {
1757 /*
1758 * arbitrary limit need for USB 3.1 Gen2
1759 * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1760 */
1761 if (isopkt[u].length > 98304) {
1762 ret = -EINVAL;
1763 goto error;
1764 }
1765 totlen += isopkt[u].length;
1766 }
1767 u *= sizeof(struct usb_iso_packet_descriptor);
1768 uurb->buffer_length = totlen;
1769 break;
1770
1771 default:
1772 return -EINVAL;
1773 }
1774
1775 if (uurb->buffer_length > 0 &&
1776 !access_ok(uurb->buffer, uurb->buffer_length)) {
1777 ret = -EFAULT;
1778 goto error;
1779 }
1780 as = alloc_async(numisoframes: number_of_packets);
1781 if (!as) {
1782 ret = -ENOMEM;
1783 goto error;
1784 }
1785
1786 as->usbm = find_memory_area(ps, uurb);
1787 if (IS_ERR(ptr: as->usbm)) {
1788 ret = PTR_ERR(ptr: as->usbm);
1789 as->usbm = NULL;
1790 goto error;
1791 }
1792
1793 /* do not use SG buffers when memory mapped segments
1794 * are in use
1795 */
1796 if (as->usbm)
1797 num_sgs = 0;
1798
1799 u += sizeof(struct async) + sizeof(struct urb) +
1800 (as->usbm ? 0 : uurb->buffer_length) +
1801 num_sgs * sizeof(struct scatterlist);
1802 ret = usbfs_increase_memory_usage(amount: u);
1803 if (ret)
1804 goto error;
1805 as->mem_usage = u;
1806
1807 if (num_sgs) {
1808 as->urb->sg = kmalloc_array(num_sgs,
1809 sizeof(struct scatterlist),
1810 GFP_KERNEL | __GFP_NOWARN);
1811 if (!as->urb->sg) {
1812 ret = -ENOMEM;
1813 goto error;
1814 }
1815 as->urb->num_sgs = num_sgs;
1816 sg_init_table(as->urb->sg, as->urb->num_sgs);
1817
1818 totlen = uurb->buffer_length;
1819 for (i = 0; i < as->urb->num_sgs; i++) {
1820 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1821 buf = kmalloc(u, GFP_KERNEL);
1822 if (!buf) {
1823 ret = -ENOMEM;
1824 goto error;
1825 }
1826 sg_set_buf(sg: &as->urb->sg[i], buf, buflen: u);
1827
1828 if (!is_in) {
1829 if (copy_from_user(to: buf, from: uurb->buffer, n: u)) {
1830 ret = -EFAULT;
1831 goto error;
1832 }
1833 uurb->buffer += u;
1834 }
1835 totlen -= u;
1836 }
1837 } else if (uurb->buffer_length > 0) {
1838 if (as->usbm) {
1839 unsigned long uurb_start = (unsigned long)uurb->buffer;
1840
1841 as->urb->transfer_buffer = as->usbm->mem +
1842 (uurb_start - as->usbm->vm_start);
1843 } else {
1844 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1845 GFP_KERNEL | __GFP_NOWARN);
1846 if (!as->urb->transfer_buffer) {
1847 ret = -ENOMEM;
1848 goto error;
1849 }
1850 if (!is_in) {
1851 if (copy_from_user(to: as->urb->transfer_buffer,
1852 from: uurb->buffer,
1853 n: uurb->buffer_length)) {
1854 ret = -EFAULT;
1855 goto error;
1856 }
1857 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1858 /*
1859 * Isochronous input data may end up being
1860 * discontiguous if some of the packets are
1861 * short. Clear the buffer so that the gaps
1862 * don't leak kernel data to userspace.
1863 */
1864 memset(s: as->urb->transfer_buffer, c: 0,
1865 n: uurb->buffer_length);
1866 }
1867 }
1868 }
1869 as->urb->dev = ps->dev;
1870 as->urb->pipe = (uurb->type << 30) |
1871 __create_pipe(dev: ps->dev, endpoint: uurb->endpoint & 0xf) |
1872 (uurb->endpoint & USB_DIR_IN);
1873
1874 /* This tedious sequence is necessary because the URB_* flags
1875 * are internal to the kernel and subject to change, whereas
1876 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1877 */
1878 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1879 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1880 u |= URB_ISO_ASAP;
1881 if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1882 u |= URB_SHORT_NOT_OK;
1883 if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1884 u |= URB_ZERO_PACKET;
1885 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1886 u |= URB_NO_INTERRUPT;
1887 as->urb->transfer_flags = u;
1888
1889 if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1890 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1891 if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1892 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1893
1894 as->urb->transfer_buffer_length = uurb->buffer_length;
1895 as->urb->setup_packet = (unsigned char *)dr;
1896 dr = NULL;
1897 as->urb->start_frame = uurb->start_frame;
1898 as->urb->number_of_packets = number_of_packets;
1899 as->urb->stream_id = stream_id;
1900
1901 if (ep->desc.bInterval) {
1902 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1903 ps->dev->speed == USB_SPEED_HIGH ||
1904 ps->dev->speed >= USB_SPEED_SUPER)
1905 as->urb->interval = 1 <<
1906 min(15, ep->desc.bInterval - 1);
1907 else
1908 as->urb->interval = ep->desc.bInterval;
1909 }
1910
1911 as->urb->context = as;
1912 as->urb->complete = async_completed;
1913 for (totlen = u = 0; u < number_of_packets; u++) {
1914 as->urb->iso_frame_desc[u].offset = totlen;
1915 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1916 totlen += isopkt[u].length;
1917 }
1918 kfree(objp: isopkt);
1919 isopkt = NULL;
1920 as->ps = ps;
1921 as->userurb = arg;
1922 as->userurb_sigval = userurb_sigval;
1923 if (as->usbm) {
1924 unsigned long uurb_start = (unsigned long)uurb->buffer;
1925
1926 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1927 as->urb->transfer_dma = as->usbm->dma_handle +
1928 (uurb_start - as->usbm->vm_start);
1929 } else if (is_in && uurb->buffer_length > 0)
1930 as->userbuffer = uurb->buffer;
1931 as->signr = uurb->signr;
1932 as->ifnum = ifnum;
1933 as->pid = get_pid(pid: task_pid(current));
1934 as->cred = get_current_cred();
1935 snoop_urb(udev: ps->dev, userurb: as->userurb, pipe: as->urb->pipe,
1936 length: as->urb->transfer_buffer_length, timeout_or_status: 0, when: SUBMIT,
1937 NULL, data_len: 0);
1938 if (!is_in)
1939 snoop_urb_data(urb: as->urb, len: as->urb->transfer_buffer_length);
1940
1941 async_newpending(as);
1942
1943 if (usb_endpoint_xfer_bulk(epd: &ep->desc)) {
1944 spin_lock_irq(lock: &ps->lock);
1945
1946 /* Not exactly the endpoint address; the direction bit is
1947 * shifted to the 0x10 position so that the value will be
1948 * between 0 and 31.
1949 */
1950 as->bulk_addr = usb_endpoint_num(epd: &ep->desc) |
1951 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1952 >> 3);
1953
1954 /* If this bulk URB is the start of a new transfer, re-enable
1955 * the endpoint. Otherwise mark it as a continuation URB.
1956 */
1957 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1958 as->bulk_status = AS_CONTINUATION;
1959 else
1960 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1961
1962 /* Don't accept continuation URBs if the endpoint is
1963 * disabled because of an earlier error.
1964 */
1965 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1966 ret = -EREMOTEIO;
1967 else
1968 ret = usb_submit_urb(urb: as->urb, GFP_ATOMIC);
1969 spin_unlock_irq(lock: &ps->lock);
1970 } else {
1971 ret = usb_submit_urb(urb: as->urb, GFP_KERNEL);
1972 }
1973
1974 if (ret) {
1975 dev_printk(KERN_DEBUG, &ps->dev->dev,
1976 "usbfs: usb_submit_urb returned %d\n", ret);
1977 snoop_urb(udev: ps->dev, userurb: as->userurb, pipe: as->urb->pipe,
1978 length: 0, timeout_or_status: ret, when: COMPLETE, NULL, data_len: 0);
1979 async_removepending(as);
1980 goto error;
1981 }
1982 return 0;
1983
1984 error:
1985 kfree(objp: isopkt);
1986 kfree(objp: dr);
1987 if (as)
1988 free_async(as);
1989 return ret;
1990}
1991
1992static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1993{
1994 struct usbdevfs_urb uurb;
1995 sigval_t userurb_sigval;
1996
1997 if (copy_from_user(to: &uurb, from: arg, n: sizeof(uurb)))
1998 return -EFAULT;
1999
2000 memset(s: &userurb_sigval, c: 0, n: sizeof(userurb_sigval));
2001 userurb_sigval.sival_ptr = arg;
2002
2003 return proc_do_submiturb(ps, uurb: &uurb,
2004 iso_frame_desc: (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
2005 arg, userurb_sigval);
2006}
2007
2008static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
2009{
2010 struct urb *urb;
2011 struct async *as;
2012 unsigned long flags;
2013
2014 spin_lock_irqsave(&ps->lock, flags);
2015 as = async_getpending(ps, userurb: arg);
2016 if (!as) {
2017 spin_unlock_irqrestore(lock: &ps->lock, flags);
2018 return -EINVAL;
2019 }
2020
2021 urb = as->urb;
2022 usb_get_urb(urb);
2023 spin_unlock_irqrestore(lock: &ps->lock, flags);
2024
2025 usb_kill_urb(urb);
2026 usb_put_urb(urb);
2027
2028 return 0;
2029}
2030
2031static void compute_isochronous_actual_length(struct urb *urb)
2032{
2033 unsigned int i;
2034
2035 if (urb->number_of_packets > 0) {
2036 urb->actual_length = 0;
2037 for (i = 0; i < urb->number_of_packets; i++)
2038 urb->actual_length +=
2039 urb->iso_frame_desc[i].actual_length;
2040 }
2041}
2042
2043static int processcompl(struct async *as, void __user * __user *arg)
2044{
2045 struct urb *urb = as->urb;
2046 struct usbdevfs_urb __user *userurb = as->userurb;
2047 void __user *addr = as->userurb;
2048 unsigned int i;
2049
2050 compute_isochronous_actual_length(urb);
2051 if (as->userbuffer && urb->actual_length) {
2052 if (copy_urb_data_to_user(userbuffer: as->userbuffer, urb))
2053 goto err_out;
2054 }
2055 if (put_user(as->status, &userurb->status))
2056 goto err_out;
2057 if (put_user(urb->actual_length, &userurb->actual_length))
2058 goto err_out;
2059 if (put_user(urb->error_count, &userurb->error_count))
2060 goto err_out;
2061
2062 if (usb_endpoint_xfer_isoc(epd: &urb->ep->desc)) {
2063 for (i = 0; i < urb->number_of_packets; i++) {
2064 if (put_user(urb->iso_frame_desc[i].actual_length,
2065 &userurb->iso_frame_desc[i].actual_length))
2066 goto err_out;
2067 if (put_user(urb->iso_frame_desc[i].status,
2068 &userurb->iso_frame_desc[i].status))
2069 goto err_out;
2070 }
2071 }
2072
2073 if (put_user(addr, (void __user * __user *)arg))
2074 return -EFAULT;
2075 return 0;
2076
2077err_out:
2078 return -EFAULT;
2079}
2080
2081static struct async *reap_as(struct usb_dev_state *ps)
2082{
2083 DECLARE_WAITQUEUE(wait, current);
2084 struct async *as = NULL;
2085 struct usb_device *dev = ps->dev;
2086
2087 add_wait_queue(wq_head: &ps->wait, wq_entry: &wait);
2088 for (;;) {
2089 __set_current_state(TASK_INTERRUPTIBLE);
2090 as = async_getcompleted(ps);
2091 if (as || !connected(ps))
2092 break;
2093 if (signal_pending(current))
2094 break;
2095 usb_unlock_device(dev);
2096 schedule();
2097 usb_lock_device(dev);
2098 }
2099 remove_wait_queue(wq_head: &ps->wait, wq_entry: &wait);
2100 set_current_state(TASK_RUNNING);
2101 return as;
2102}
2103
2104static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
2105{
2106 struct async *as = reap_as(ps);
2107
2108 if (as) {
2109 int retval;
2110
2111 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2112 retval = processcompl(as, arg: (void __user * __user *)arg);
2113 free_async(as);
2114 return retval;
2115 }
2116 if (signal_pending(current))
2117 return -EINTR;
2118 return -ENODEV;
2119}
2120
2121static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
2122{
2123 int retval;
2124 struct async *as;
2125
2126 as = async_getcompleted(ps);
2127 if (as) {
2128 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2129 retval = processcompl(as, arg: (void __user * __user *)arg);
2130 free_async(as);
2131 } else {
2132 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2133 }
2134 return retval;
2135}
2136
2137#ifdef CONFIG_COMPAT
2138static int proc_control_compat(struct usb_dev_state *ps,
2139 struct usbdevfs_ctrltransfer32 __user *p32)
2140{
2141 struct usbdevfs_ctrltransfer ctrl;
2142 u32 udata;
2143
2144 if (copy_from_user(to: &ctrl, from: p32, n: sizeof(*p32) - sizeof(compat_caddr_t)) ||
2145 get_user(udata, &p32->data))
2146 return -EFAULT;
2147 ctrl.data = compat_ptr(uptr: udata);
2148 return do_proc_control(ps, ctrl: &ctrl);
2149}
2150
2151static int proc_bulk_compat(struct usb_dev_state *ps,
2152 struct usbdevfs_bulktransfer32 __user *p32)
2153{
2154 struct usbdevfs_bulktransfer bulk;
2155 compat_caddr_t addr;
2156
2157 if (get_user(bulk.ep, &p32->ep) ||
2158 get_user(bulk.len, &p32->len) ||
2159 get_user(bulk.timeout, &p32->timeout) ||
2160 get_user(addr, &p32->data))
2161 return -EFAULT;
2162 bulk.data = compat_ptr(uptr: addr);
2163 return do_proc_bulk(ps, bulk: &bulk);
2164}
2165
2166static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2167{
2168 struct usbdevfs_disconnectsignal32 ds;
2169
2170 if (copy_from_user(to: &ds, from: arg, n: sizeof(ds)))
2171 return -EFAULT;
2172 ps->discsignr = ds.signr;
2173 ps->disccontext.sival_int = ds.context;
2174 return 0;
2175}
2176
2177static int get_urb32(struct usbdevfs_urb *kurb,
2178 struct usbdevfs_urb32 __user *uurb)
2179{
2180 struct usbdevfs_urb32 urb32;
2181 if (copy_from_user(to: &urb32, from: uurb, n: sizeof(*uurb)))
2182 return -EFAULT;
2183 kurb->type = urb32.type;
2184 kurb->endpoint = urb32.endpoint;
2185 kurb->status = urb32.status;
2186 kurb->flags = urb32.flags;
2187 kurb->buffer = compat_ptr(uptr: urb32.buffer);
2188 kurb->buffer_length = urb32.buffer_length;
2189 kurb->actual_length = urb32.actual_length;
2190 kurb->start_frame = urb32.start_frame;
2191 kurb->number_of_packets = urb32.number_of_packets;
2192 kurb->error_count = urb32.error_count;
2193 kurb->signr = urb32.signr;
2194 kurb->usercontext = compat_ptr(uptr: urb32.usercontext);
2195 return 0;
2196}
2197
2198static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2199{
2200 struct usbdevfs_urb uurb;
2201 sigval_t userurb_sigval;
2202
2203 if (get_urb32(kurb: &uurb, uurb: (struct usbdevfs_urb32 __user *)arg))
2204 return -EFAULT;
2205
2206 memset(s: &userurb_sigval, c: 0, n: sizeof(userurb_sigval));
2207 userurb_sigval.sival_int = ptr_to_compat(uptr: arg);
2208
2209 return proc_do_submiturb(ps, uurb: &uurb,
2210 iso_frame_desc: ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2211 arg, userurb_sigval);
2212}
2213
2214static int processcompl_compat(struct async *as, void __user * __user *arg)
2215{
2216 struct urb *urb = as->urb;
2217 struct usbdevfs_urb32 __user *userurb = as->userurb;
2218 void __user *addr = as->userurb;
2219 unsigned int i;
2220
2221 compute_isochronous_actual_length(urb);
2222 if (as->userbuffer && urb->actual_length) {
2223 if (copy_urb_data_to_user(userbuffer: as->userbuffer, urb))
2224 return -EFAULT;
2225 }
2226 if (put_user(as->status, &userurb->status))
2227 return -EFAULT;
2228 if (put_user(urb->actual_length, &userurb->actual_length))
2229 return -EFAULT;
2230 if (put_user(urb->error_count, &userurb->error_count))
2231 return -EFAULT;
2232
2233 if (usb_endpoint_xfer_isoc(epd: &urb->ep->desc)) {
2234 for (i = 0; i < urb->number_of_packets; i++) {
2235 if (put_user(urb->iso_frame_desc[i].actual_length,
2236 &userurb->iso_frame_desc[i].actual_length))
2237 return -EFAULT;
2238 if (put_user(urb->iso_frame_desc[i].status,
2239 &userurb->iso_frame_desc[i].status))
2240 return -EFAULT;
2241 }
2242 }
2243
2244 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2245 return -EFAULT;
2246 return 0;
2247}
2248
2249static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2250{
2251 struct async *as = reap_as(ps);
2252
2253 if (as) {
2254 int retval;
2255
2256 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2257 retval = processcompl_compat(as, arg: (void __user * __user *)arg);
2258 free_async(as);
2259 return retval;
2260 }
2261 if (signal_pending(current))
2262 return -EINTR;
2263 return -ENODEV;
2264}
2265
2266static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2267{
2268 int retval;
2269 struct async *as;
2270
2271 as = async_getcompleted(ps);
2272 if (as) {
2273 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2274 retval = processcompl_compat(as, arg: (void __user * __user *)arg);
2275 free_async(as);
2276 } else {
2277 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2278 }
2279 return retval;
2280}
2281
2282
2283#endif
2284
2285static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2286{
2287 struct usbdevfs_disconnectsignal ds;
2288
2289 if (copy_from_user(to: &ds, from: arg, n: sizeof(ds)))
2290 return -EFAULT;
2291 ps->discsignr = ds.signr;
2292 ps->disccontext.sival_ptr = ds.context;
2293 return 0;
2294}
2295
2296static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2297{
2298 unsigned int ifnum;
2299
2300 if (get_user(ifnum, (unsigned int __user *)arg))
2301 return -EFAULT;
2302 return claimintf(ps, ifnum);
2303}
2304
2305static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2306{
2307 unsigned int ifnum;
2308 int ret;
2309
2310 if (get_user(ifnum, (unsigned int __user *)arg))
2311 return -EFAULT;
2312 ret = releaseintf(ps, ifnum);
2313 if (ret < 0)
2314 return ret;
2315 destroy_async_on_interface(ps, ifnum);
2316 return 0;
2317}
2318
2319static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2320{
2321 int size;
2322 void *buf = NULL;
2323 int retval = 0;
2324 struct usb_interface *intf = NULL;
2325 struct usb_driver *driver = NULL;
2326
2327 if (ps->privileges_dropped)
2328 return -EACCES;
2329
2330 if (!connected(ps))
2331 return -ENODEV;
2332
2333 /* alloc buffer */
2334 size = _IOC_SIZE(ctl->ioctl_code);
2335 if (size > 0) {
2336 buf = kmalloc(size, GFP_KERNEL);
2337 if (buf == NULL)
2338 return -ENOMEM;
2339 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2340 if (copy_from_user(to: buf, from: ctl->data, n: size)) {
2341 kfree(objp: buf);
2342 return -EFAULT;
2343 }
2344 } else {
2345 memset(s: buf, c: 0, n: size);
2346 }
2347 }
2348
2349 if (ps->dev->state != USB_STATE_CONFIGURED)
2350 retval = -EHOSTUNREACH;
2351 else if (!(intf = usb_ifnum_to_if(dev: ps->dev, ifnum: ctl->ifno)))
2352 retval = -EINVAL;
2353 else switch (ctl->ioctl_code) {
2354
2355 /* disconnect kernel driver from interface */
2356 case USBDEVFS_DISCONNECT:
2357 if (intf->dev.driver) {
2358 driver = to_usb_driver(intf->dev.driver);
2359 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2360 usb_driver_release_interface(driver, iface: intf);
2361 } else
2362 retval = -ENODATA;
2363 break;
2364
2365 /* let kernel drivers try to (re)bind to the interface */
2366 case USBDEVFS_CONNECT:
2367 if (!intf->dev.driver)
2368 retval = device_attach(dev: &intf->dev);
2369 else
2370 retval = -EBUSY;
2371 break;
2372
2373 /* talk directly to the interface's driver */
2374 default:
2375 if (intf->dev.driver)
2376 driver = to_usb_driver(intf->dev.driver);
2377 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2378 retval = -ENOTTY;
2379 } else {
2380 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2381 if (retval == -ENOIOCTLCMD)
2382 retval = -ENOTTY;
2383 }
2384 }
2385
2386 /* cleanup and return */
2387 if (retval >= 0
2388 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2389 && size > 0
2390 && copy_to_user(to: ctl->data, from: buf, n: size) != 0)
2391 retval = -EFAULT;
2392
2393 kfree(objp: buf);
2394 return retval;
2395}
2396
2397static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2398{
2399 struct usbdevfs_ioctl ctrl;
2400
2401 if (copy_from_user(to: &ctrl, from: arg, n: sizeof(ctrl)))
2402 return -EFAULT;
2403 return proc_ioctl(ps, ctl: &ctrl);
2404}
2405
2406#ifdef CONFIG_COMPAT
2407static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2408{
2409 struct usbdevfs_ioctl32 ioc32;
2410 struct usbdevfs_ioctl ctrl;
2411
2412 if (copy_from_user(to: &ioc32, from: compat_ptr(uptr: arg), n: sizeof(ioc32)))
2413 return -EFAULT;
2414 ctrl.ifno = ioc32.ifno;
2415 ctrl.ioctl_code = ioc32.ioctl_code;
2416 ctrl.data = compat_ptr(uptr: ioc32.data);
2417 return proc_ioctl(ps, ctl: &ctrl);
2418}
2419#endif
2420
2421static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2422{
2423 unsigned portnum;
2424 int rc;
2425
2426 if (get_user(portnum, (unsigned __user *) arg))
2427 return -EFAULT;
2428 rc = usb_hub_claim_port(hdev: ps->dev, port1: portnum, owner: ps);
2429 if (rc == 0)
2430 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2431 portnum, task_pid_nr(current), current->comm);
2432 return rc;
2433}
2434
2435static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2436{
2437 unsigned portnum;
2438
2439 if (get_user(portnum, (unsigned __user *) arg))
2440 return -EFAULT;
2441 return usb_hub_release_port(hdev: ps->dev, port1: portnum, owner: ps);
2442}
2443
2444static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2445{
2446 __u32 caps;
2447
2448 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2449 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2450 USBDEVFS_CAP_DROP_PRIVILEGES |
2451 USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2452 if (!ps->dev->bus->no_stop_on_short)
2453 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2454 if (ps->dev->bus->sg_tablesize)
2455 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2456
2457 if (put_user(caps, (__u32 __user *)arg))
2458 return -EFAULT;
2459
2460 return 0;
2461}
2462
2463static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2464{
2465 struct usbdevfs_disconnect_claim dc;
2466 struct usb_interface *intf;
2467
2468 if (copy_from_user(to: &dc, from: arg, n: sizeof(dc)))
2469 return -EFAULT;
2470
2471 intf = usb_ifnum_to_if(dev: ps->dev, ifnum: dc.interface);
2472 if (!intf)
2473 return -EINVAL;
2474
2475 if (intf->dev.driver) {
2476 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2477
2478 if (ps->privileges_dropped)
2479 return -EACCES;
2480
2481 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2482 strncmp(dc.driver, intf->dev.driver->name,
2483 sizeof(dc.driver)) != 0)
2484 return -EBUSY;
2485
2486 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2487 strncmp(dc.driver, intf->dev.driver->name,
2488 sizeof(dc.driver)) == 0)
2489 return -EBUSY;
2490
2491 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2492 usb_driver_release_interface(driver, iface: intf);
2493 }
2494
2495 return claimintf(ps, ifnum: dc.interface);
2496}
2497
2498static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2499{
2500 unsigned num_streams, num_eps;
2501 struct usb_host_endpoint **eps;
2502 struct usb_interface *intf;
2503 int r;
2504
2505 r = parse_usbdevfs_streams(ps, streams: arg, num_streams_ret: &num_streams, num_eps_ret: &num_eps,
2506 eps_ret: &eps, intf_ret: &intf);
2507 if (r)
2508 return r;
2509
2510 destroy_async_on_interface(ps,
2511 ifnum: intf->altsetting[0].desc.bInterfaceNumber);
2512
2513 r = usb_alloc_streams(interface: intf, eps, num_eps, num_streams, GFP_KERNEL);
2514 kfree(objp: eps);
2515 return r;
2516}
2517
2518static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2519{
2520 unsigned num_eps;
2521 struct usb_host_endpoint **eps;
2522 struct usb_interface *intf;
2523 int r;
2524
2525 r = parse_usbdevfs_streams(ps, streams: arg, NULL, num_eps_ret: &num_eps, eps_ret: &eps, intf_ret: &intf);
2526 if (r)
2527 return r;
2528
2529 destroy_async_on_interface(ps,
2530 ifnum: intf->altsetting[0].desc.bInterfaceNumber);
2531
2532 r = usb_free_streams(interface: intf, eps, num_eps, GFP_KERNEL);
2533 kfree(objp: eps);
2534 return r;
2535}
2536
2537static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2538{
2539 u32 data;
2540
2541 if (copy_from_user(to: &data, from: arg, n: sizeof(data)))
2542 return -EFAULT;
2543
2544 /* This is a one way operation. Once privileges are
2545 * dropped, you cannot regain them. You may however reissue
2546 * this ioctl to shrink the allowed interfaces mask.
2547 */
2548 ps->interface_allowed_mask &= data;
2549 ps->privileges_dropped = true;
2550
2551 return 0;
2552}
2553
2554static int proc_forbid_suspend(struct usb_dev_state *ps)
2555{
2556 int ret = 0;
2557
2558 if (ps->suspend_allowed) {
2559 ret = usb_autoresume_device(udev: ps->dev);
2560 if (ret == 0)
2561 ps->suspend_allowed = false;
2562 else if (ret != -ENODEV)
2563 ret = -EIO;
2564 }
2565 return ret;
2566}
2567
2568static int proc_allow_suspend(struct usb_dev_state *ps)
2569{
2570 if (!connected(ps))
2571 return -ENODEV;
2572
2573 WRITE_ONCE(ps->not_yet_resumed, 1);
2574 if (!ps->suspend_allowed) {
2575 usb_autosuspend_device(udev: ps->dev);
2576 ps->suspend_allowed = true;
2577 }
2578 return 0;
2579}
2580
2581static int proc_wait_for_resume(struct usb_dev_state *ps)
2582{
2583 int ret;
2584
2585 usb_unlock_device(ps->dev);
2586 ret = wait_event_interruptible(ps->wait_for_resume,
2587 READ_ONCE(ps->not_yet_resumed) == 0);
2588 usb_lock_device(ps->dev);
2589
2590 if (ret != 0)
2591 return -EINTR;
2592 return proc_forbid_suspend(ps);
2593}
2594
2595/*
2596 * NOTE: All requests here that have interface numbers as parameters
2597 * are assuming that somehow the configuration has been prevented from
2598 * changing. But there's no mechanism to ensure that...
2599 */
2600static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2601 void __user *p)
2602{
2603 struct usb_dev_state *ps = file->private_data;
2604 struct inode *inode = file_inode(f: file);
2605 struct usb_device *dev = ps->dev;
2606 int ret = -ENOTTY;
2607
2608 if (!(file->f_mode & FMODE_WRITE))
2609 return -EPERM;
2610
2611 usb_lock_device(dev);
2612
2613 /* Reap operations are allowed even after disconnection */
2614 switch (cmd) {
2615 case USBDEVFS_REAPURB:
2616 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2617 ret = proc_reapurb(ps, arg: p);
2618 goto done;
2619
2620 case USBDEVFS_REAPURBNDELAY:
2621 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2622 ret = proc_reapurbnonblock(ps, arg: p);
2623 goto done;
2624
2625#ifdef CONFIG_COMPAT
2626 case USBDEVFS_REAPURB32:
2627 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2628 ret = proc_reapurb_compat(ps, arg: p);
2629 goto done;
2630
2631 case USBDEVFS_REAPURBNDELAY32:
2632 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2633 ret = proc_reapurbnonblock_compat(ps, arg: p);
2634 goto done;
2635#endif
2636 }
2637
2638 if (!connected(ps)) {
2639 usb_unlock_device(dev);
2640 return -ENODEV;
2641 }
2642
2643 switch (cmd) {
2644 case USBDEVFS_CONTROL:
2645 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2646 ret = proc_control(ps, arg: p);
2647 if (ret >= 0)
2648 inode_set_mtime_to_ts(inode,
2649 ts: inode_set_ctime_current(inode));
2650 break;
2651
2652 case USBDEVFS_BULK:
2653 snoop(&dev->dev, "%s: BULK\n", __func__);
2654 ret = proc_bulk(ps, arg: p);
2655 if (ret >= 0)
2656 inode_set_mtime_to_ts(inode,
2657 ts: inode_set_ctime_current(inode));
2658 break;
2659
2660 case USBDEVFS_RESETEP:
2661 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2662 ret = proc_resetep(ps, arg: p);
2663 if (ret >= 0)
2664 inode_set_mtime_to_ts(inode,
2665 ts: inode_set_ctime_current(inode));
2666 break;
2667
2668 case USBDEVFS_RESET:
2669 snoop(&dev->dev, "%s: RESET\n", __func__);
2670 ret = proc_resetdevice(ps);
2671 break;
2672
2673 case USBDEVFS_CLEAR_HALT:
2674 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2675 ret = proc_clearhalt(ps, arg: p);
2676 if (ret >= 0)
2677 inode_set_mtime_to_ts(inode,
2678 ts: inode_set_ctime_current(inode));
2679 break;
2680
2681 case USBDEVFS_GETDRIVER:
2682 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2683 ret = proc_getdriver(ps, arg: p);
2684 break;
2685
2686 case USBDEVFS_CONNECTINFO:
2687 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2688 ret = proc_connectinfo(ps, arg: p);
2689 break;
2690
2691 case USBDEVFS_SETINTERFACE:
2692 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2693 ret = proc_setintf(ps, arg: p);
2694 break;
2695
2696 case USBDEVFS_SETCONFIGURATION:
2697 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2698 ret = proc_setconfig(ps, arg: p);
2699 break;
2700
2701 case USBDEVFS_SUBMITURB:
2702 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2703 ret = proc_submiturb(ps, arg: p);
2704 if (ret >= 0)
2705 inode_set_mtime_to_ts(inode,
2706 ts: inode_set_ctime_current(inode));
2707 break;
2708
2709#ifdef CONFIG_COMPAT
2710 case USBDEVFS_CONTROL32:
2711 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2712 ret = proc_control_compat(ps, p32: p);
2713 if (ret >= 0)
2714 inode_set_mtime_to_ts(inode,
2715 ts: inode_set_ctime_current(inode));
2716 break;
2717
2718 case USBDEVFS_BULK32:
2719 snoop(&dev->dev, "%s: BULK32\n", __func__);
2720 ret = proc_bulk_compat(ps, p32: p);
2721 if (ret >= 0)
2722 inode_set_mtime_to_ts(inode,
2723 ts: inode_set_ctime_current(inode));
2724 break;
2725
2726 case USBDEVFS_DISCSIGNAL32:
2727 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2728 ret = proc_disconnectsignal_compat(ps, arg: p);
2729 break;
2730
2731 case USBDEVFS_SUBMITURB32:
2732 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2733 ret = proc_submiturb_compat(ps, arg: p);
2734 if (ret >= 0)
2735 inode_set_mtime_to_ts(inode,
2736 ts: inode_set_ctime_current(inode));
2737 break;
2738
2739 case USBDEVFS_IOCTL32:
2740 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2741 ret = proc_ioctl_compat(ps, arg: ptr_to_compat(uptr: p));
2742 break;
2743#endif
2744
2745 case USBDEVFS_DISCARDURB:
2746 snoop(&dev->dev, "%s: DISCARDURB %px\n", __func__, p);
2747 ret = proc_unlinkurb(ps, arg: p);
2748 break;
2749
2750 case USBDEVFS_DISCSIGNAL:
2751 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2752 ret = proc_disconnectsignal(ps, arg: p);
2753 break;
2754
2755 case USBDEVFS_CLAIMINTERFACE:
2756 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2757 ret = proc_claiminterface(ps, arg: p);
2758 break;
2759
2760 case USBDEVFS_RELEASEINTERFACE:
2761 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2762 ret = proc_releaseinterface(ps, arg: p);
2763 break;
2764
2765 case USBDEVFS_IOCTL:
2766 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2767 ret = proc_ioctl_default(ps, arg: p);
2768 break;
2769
2770 case USBDEVFS_CLAIM_PORT:
2771 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2772 ret = proc_claim_port(ps, arg: p);
2773 break;
2774
2775 case USBDEVFS_RELEASE_PORT:
2776 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2777 ret = proc_release_port(ps, arg: p);
2778 break;
2779 case USBDEVFS_GET_CAPABILITIES:
2780 ret = proc_get_capabilities(ps, arg: p);
2781 break;
2782 case USBDEVFS_DISCONNECT_CLAIM:
2783 ret = proc_disconnect_claim(ps, arg: p);
2784 break;
2785 case USBDEVFS_ALLOC_STREAMS:
2786 ret = proc_alloc_streams(ps, arg: p);
2787 break;
2788 case USBDEVFS_FREE_STREAMS:
2789 ret = proc_free_streams(ps, arg: p);
2790 break;
2791 case USBDEVFS_DROP_PRIVILEGES:
2792 ret = proc_drop_privileges(ps, arg: p);
2793 break;
2794 case USBDEVFS_GET_SPEED:
2795 ret = ps->dev->speed;
2796 break;
2797 case USBDEVFS_FORBID_SUSPEND:
2798 ret = proc_forbid_suspend(ps);
2799 break;
2800 case USBDEVFS_ALLOW_SUSPEND:
2801 ret = proc_allow_suspend(ps);
2802 break;
2803 case USBDEVFS_WAIT_FOR_RESUME:
2804 ret = proc_wait_for_resume(ps);
2805 break;
2806 }
2807
2808 /* Handle variable-length commands */
2809 switch (cmd & ~IOCSIZE_MASK) {
2810 case USBDEVFS_CONNINFO_EX(0):
2811 ret = proc_conninfo_ex(ps, arg: p, _IOC_SIZE(cmd));
2812 break;
2813 }
2814
2815 done:
2816 usb_unlock_device(dev);
2817 if (ret >= 0)
2818 inode_set_atime_to_ts(inode, ts: current_time(inode));
2819 return ret;
2820}
2821
2822static long usbdev_ioctl(struct file *file, unsigned int cmd,
2823 unsigned long arg)
2824{
2825 int ret;
2826
2827 ret = usbdev_do_ioctl(file, cmd, p: (void __user *)arg);
2828
2829 return ret;
2830}
2831
2832/* No kernel lock - fine */
2833static __poll_t usbdev_poll(struct file *file,
2834 struct poll_table_struct *wait)
2835{
2836 struct usb_dev_state *ps = file->private_data;
2837 __poll_t mask = 0;
2838
2839 poll_wait(filp: file, wait_address: &ps->wait, p: wait);
2840 if (file->f_mode & FMODE_WRITE && !list_empty(head: &ps->async_completed))
2841 mask |= EPOLLOUT | EPOLLWRNORM;
2842 if (!connected(ps))
2843 mask |= EPOLLHUP;
2844 if (list_empty(head: &ps->list))
2845 mask |= EPOLLERR;
2846 return mask;
2847}
2848
2849const struct file_operations usbdev_file_operations = {
2850 .owner = THIS_MODULE,
2851 .llseek = no_seek_end_llseek,
2852 .read = usbdev_read,
2853 .poll = usbdev_poll,
2854 .unlocked_ioctl = usbdev_ioctl,
2855 .compat_ioctl = compat_ptr_ioctl,
2856 .mmap = usbdev_mmap,
2857 .open = usbdev_open,
2858 .release = usbdev_release,
2859};
2860
2861static void usbdev_remove(struct usb_device *udev)
2862{
2863 struct usb_dev_state *ps;
2864
2865 /* Protect against simultaneous resume */
2866 mutex_lock(lock: &usbfs_mutex);
2867 while (!list_empty(head: &udev->filelist)) {
2868 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2869 destroy_all_async(ps);
2870 wake_up_all(&ps->wait);
2871 WRITE_ONCE(ps->not_yet_resumed, 0);
2872 wake_up_all(&ps->wait_for_resume);
2873 list_del_init(entry: &ps->list);
2874 if (ps->discsignr)
2875 kill_pid_usb_asyncio(sig: ps->discsignr, EPIPE, addr: ps->disccontext,
2876 ps->disc_pid, ps->cred);
2877 }
2878 mutex_unlock(lock: &usbfs_mutex);
2879}
2880
2881static int usbdev_notify(struct notifier_block *self,
2882 unsigned long action, void *dev)
2883{
2884 switch (action) {
2885 case USB_DEVICE_ADD:
2886 break;
2887 case USB_DEVICE_REMOVE:
2888 usbdev_remove(udev: dev);
2889 break;
2890 }
2891 return NOTIFY_OK;
2892}
2893
2894static struct notifier_block usbdev_nb = {
2895 .notifier_call = usbdev_notify,
2896};
2897
2898static struct cdev usb_device_cdev;
2899
2900int __init usb_devio_init(void)
2901{
2902 int retval;
2903
2904 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2905 "usb_device");
2906 if (retval) {
2907 printk(KERN_ERR "Unable to register minors for usb_device\n");
2908 goto out;
2909 }
2910 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2911 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2912 if (retval) {
2913 printk(KERN_ERR "Unable to get usb_device major %d\n",
2914 USB_DEVICE_MAJOR);
2915 goto error_cdev;
2916 }
2917 usb_register_notify(nb: &usbdev_nb);
2918out:
2919 return retval;
2920
2921error_cdev:
2922 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2923 goto out;
2924}
2925
2926void usb_devio_cleanup(void)
2927{
2928 usb_unregister_notify(nb: &usbdev_nb);
2929 cdev_del(&usb_device_cdev);
2930 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2931}
2932