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