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[kvmfornfv.git] / kernel / 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                 memset(&sinfo, 0, sizeof(sinfo));
505                 sinfo.si_signo = as->signr;
506                 sinfo.si_errno = as->status;
507                 sinfo.si_code = SI_ASYNCIO;
508                 sinfo.si_addr = as->userurb;
509                 pid = get_pid(as->pid);
510                 cred = get_cred(as->cred);
511                 secid = as->secid;
512         }
513         snoop(&urb->dev->dev, "urb complete\n");
514         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
515                         as->status, COMPLETE, NULL, 0);
516         if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
517                 snoop_urb_data(urb, urb->actual_length);
518
519         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
520                         as->status != -ENOENT)
521                 cancel_bulk_urbs(ps, as->bulk_addr);
522         spin_unlock(&ps->lock);
523
524         if (signr) {
525                 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
526                 put_pid(pid);
527                 put_cred(cred);
528         }
529
530         wake_up(&ps->wait);
531 }
532
533 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
534 {
535         struct urb *urb;
536         struct async *as;
537         unsigned long flags;
538
539         spin_lock_irqsave(&ps->lock, flags);
540         while (!list_empty(list)) {
541                 as = list_entry(list->next, struct async, asynclist);
542                 list_del_init(&as->asynclist);
543                 urb = as->urb;
544                 usb_get_urb(urb);
545
546                 /* drop the spinlock so the completion handler can run */
547                 spin_unlock_irqrestore(&ps->lock, flags);
548                 usb_kill_urb(urb);
549                 usb_put_urb(urb);
550                 spin_lock_irqsave(&ps->lock, flags);
551         }
552         spin_unlock_irqrestore(&ps->lock, flags);
553 }
554
555 static void destroy_async_on_interface(struct usb_dev_state *ps,
556                                        unsigned int ifnum)
557 {
558         struct list_head *p, *q, hitlist;
559         unsigned long flags;
560
561         INIT_LIST_HEAD(&hitlist);
562         spin_lock_irqsave(&ps->lock, flags);
563         list_for_each_safe(p, q, &ps->async_pending)
564                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
565                         list_move_tail(p, &hitlist);
566         spin_unlock_irqrestore(&ps->lock, flags);
567         destroy_async(ps, &hitlist);
568 }
569
570 static void destroy_all_async(struct usb_dev_state *ps)
571 {
572         destroy_async(ps, &ps->async_pending);
573 }
574
575 /*
576  * interface claims are made only at the request of user level code,
577  * which can also release them (explicitly or by closing files).
578  * they're also undone when devices disconnect.
579  */
580
581 static int driver_probe(struct usb_interface *intf,
582                         const struct usb_device_id *id)
583 {
584         return -ENODEV;
585 }
586
587 static void driver_disconnect(struct usb_interface *intf)
588 {
589         struct usb_dev_state *ps = usb_get_intfdata(intf);
590         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
591
592         if (!ps)
593                 return;
594
595         /* NOTE:  this relies on usbcore having canceled and completed
596          * all pending I/O requests; 2.6 does that.
597          */
598
599         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
600                 clear_bit(ifnum, &ps->ifclaimed);
601         else
602                 dev_warn(&intf->dev, "interface number %u out of range\n",
603                          ifnum);
604
605         usb_set_intfdata(intf, NULL);
606
607         /* force async requests to complete */
608         destroy_async_on_interface(ps, ifnum);
609 }
610
611 /* The following routines are merely placeholders.  There is no way
612  * to inform a user task about suspend or resumes.
613  */
614 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
615 {
616         return 0;
617 }
618
619 static int driver_resume(struct usb_interface *intf)
620 {
621         return 0;
622 }
623
624 struct usb_driver usbfs_driver = {
625         .name =         "usbfs",
626         .probe =        driver_probe,
627         .disconnect =   driver_disconnect,
628         .suspend =      driver_suspend,
629         .resume =       driver_resume,
630 };
631
632 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
633 {
634         struct usb_device *dev = ps->dev;
635         struct usb_interface *intf;
636         int err;
637
638         if (ifnum >= 8*sizeof(ps->ifclaimed))
639                 return -EINVAL;
640         /* already claimed */
641         if (test_bit(ifnum, &ps->ifclaimed))
642                 return 0;
643
644         intf = usb_ifnum_to_if(dev, ifnum);
645         if (!intf)
646                 err = -ENOENT;
647         else
648                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
649         if (err == 0)
650                 set_bit(ifnum, &ps->ifclaimed);
651         return err;
652 }
653
654 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
655 {
656         struct usb_device *dev;
657         struct usb_interface *intf;
658         int err;
659
660         err = -EINVAL;
661         if (ifnum >= 8*sizeof(ps->ifclaimed))
662                 return err;
663         dev = ps->dev;
664         intf = usb_ifnum_to_if(dev, ifnum);
665         if (!intf)
666                 err = -ENOENT;
667         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
668                 usb_driver_release_interface(&usbfs_driver, intf);
669                 err = 0;
670         }
671         return err;
672 }
673
674 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
675 {
676         if (ps->dev->state != USB_STATE_CONFIGURED)
677                 return -EHOSTUNREACH;
678         if (ifnum >= 8*sizeof(ps->ifclaimed))
679                 return -EINVAL;
680         if (test_bit(ifnum, &ps->ifclaimed))
681                 return 0;
682         /* if not yet claimed, claim it for the driver */
683         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
684                  "interface %u before use\n", task_pid_nr(current),
685                  current->comm, ifnum);
686         return claimintf(ps, ifnum);
687 }
688
689 static int findintfep(struct usb_device *dev, unsigned int ep)
690 {
691         unsigned int i, j, e;
692         struct usb_interface *intf;
693         struct usb_host_interface *alts;
694         struct usb_endpoint_descriptor *endpt;
695
696         if (ep & ~(USB_DIR_IN|0xf))
697                 return -EINVAL;
698         if (!dev->actconfig)
699                 return -ESRCH;
700         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
701                 intf = dev->actconfig->interface[i];
702                 for (j = 0; j < intf->num_altsetting; j++) {
703                         alts = &intf->altsetting[j];
704                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
705                                 endpt = &alts->endpoint[e].desc;
706                                 if (endpt->bEndpointAddress == ep)
707                                         return alts->desc.bInterfaceNumber;
708                         }
709                 }
710         }
711         return -ENOENT;
712 }
713
714 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
715                            unsigned int request, unsigned int index)
716 {
717         int ret = 0;
718         struct usb_host_interface *alt_setting;
719
720         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
721          && ps->dev->state != USB_STATE_ADDRESS
722          && ps->dev->state != USB_STATE_CONFIGURED)
723                 return -EHOSTUNREACH;
724         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
725                 return 0;
726
727         /*
728          * check for the special corner case 'get_device_id' in the printer
729          * class specification, which we always want to allow as it is used
730          * to query things like ink level, etc.
731          */
732         if (requesttype == 0xa1 && request == 0) {
733                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
734                                                    index >> 8, index & 0xff);
735                 if (alt_setting
736                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
737                         return 0;
738         }
739
740         index &= 0xff;
741         switch (requesttype & USB_RECIP_MASK) {
742         case USB_RECIP_ENDPOINT:
743                 if ((index & ~USB_DIR_IN) == 0)
744                         return 0;
745                 ret = findintfep(ps->dev, index);
746                 if (ret < 0) {
747                         /*
748                          * Some not fully compliant Win apps seem to get
749                          * index wrong and have the endpoint number here
750                          * rather than the endpoint address (with the
751                          * correct direction). Win does let this through,
752                          * so we'll not reject it here but leave it to
753                          * the device to not break KVM. But we warn.
754                          */
755                         ret = findintfep(ps->dev, index ^ 0x80);
756                         if (ret >= 0)
757                                 dev_info(&ps->dev->dev,
758                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
759                                         __func__, task_pid_nr(current),
760                                         current->comm, index, index ^ 0x80);
761                 }
762                 if (ret >= 0)
763                         ret = checkintf(ps, ret);
764                 break;
765
766         case USB_RECIP_INTERFACE:
767                 ret = checkintf(ps, index);
768                 break;
769         }
770         return ret;
771 }
772
773 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
774                                                      unsigned char ep)
775 {
776         if (ep & USB_ENDPOINT_DIR_MASK)
777                 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
778         else
779                 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
780 }
781
782 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
783                                   struct usbdevfs_streams __user *streams,
784                                   unsigned int *num_streams_ret,
785                                   unsigned int *num_eps_ret,
786                                   struct usb_host_endpoint ***eps_ret,
787                                   struct usb_interface **intf_ret)
788 {
789         unsigned int i, num_streams, num_eps;
790         struct usb_host_endpoint **eps;
791         struct usb_interface *intf = NULL;
792         unsigned char ep;
793         int ifnum, ret;
794
795         if (get_user(num_streams, &streams->num_streams) ||
796             get_user(num_eps, &streams->num_eps))
797                 return -EFAULT;
798
799         if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
800                 return -EINVAL;
801
802         /* The XHCI controller allows max 2 ^ 16 streams */
803         if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
804                 return -EINVAL;
805
806         eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
807         if (!eps)
808                 return -ENOMEM;
809
810         for (i = 0; i < num_eps; i++) {
811                 if (get_user(ep, &streams->eps[i])) {
812                         ret = -EFAULT;
813                         goto error;
814                 }
815                 eps[i] = ep_to_host_endpoint(ps->dev, ep);
816                 if (!eps[i]) {
817                         ret = -EINVAL;
818                         goto error;
819                 }
820
821                 /* usb_alloc/free_streams operate on an usb_interface */
822                 ifnum = findintfep(ps->dev, ep);
823                 if (ifnum < 0) {
824                         ret = ifnum;
825                         goto error;
826                 }
827
828                 if (i == 0) {
829                         ret = checkintf(ps, ifnum);
830                         if (ret < 0)
831                                 goto error;
832                         intf = usb_ifnum_to_if(ps->dev, ifnum);
833                 } else {
834                         /* Verify all eps belong to the same interface */
835                         if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
836                                 ret = -EINVAL;
837                                 goto error;
838                         }
839                 }
840         }
841
842         if (num_streams_ret)
843                 *num_streams_ret = num_streams;
844         *num_eps_ret = num_eps;
845         *eps_ret = eps;
846         *intf_ret = intf;
847
848         return 0;
849
850 error:
851         kfree(eps);
852         return ret;
853 }
854
855 static int match_devt(struct device *dev, void *data)
856 {
857         return dev->devt == (dev_t) (unsigned long) data;
858 }
859
860 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
861 {
862         struct device *dev;
863
864         dev = bus_find_device(&usb_bus_type, NULL,
865                               (void *) (unsigned long) devt, match_devt);
866         if (!dev)
867                 return NULL;
868         return container_of(dev, struct usb_device, dev);
869 }
870
871 /*
872  * file operations
873  */
874 static int usbdev_open(struct inode *inode, struct file *file)
875 {
876         struct usb_device *dev = NULL;
877         struct usb_dev_state *ps;
878         int ret;
879
880         ret = -ENOMEM;
881         ps = kmalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
882         if (!ps)
883                 goto out_free_ps;
884
885         ret = -ENODEV;
886
887         /* Protect against simultaneous removal or release */
888         mutex_lock(&usbfs_mutex);
889
890         /* usbdev device-node */
891         if (imajor(inode) == USB_DEVICE_MAJOR)
892                 dev = usbdev_lookup_by_devt(inode->i_rdev);
893
894         mutex_unlock(&usbfs_mutex);
895
896         if (!dev)
897                 goto out_free_ps;
898
899         usb_lock_device(dev);
900         if (dev->state == USB_STATE_NOTATTACHED)
901                 goto out_unlock_device;
902
903         ret = usb_autoresume_device(dev);
904         if (ret)
905                 goto out_unlock_device;
906
907         ps->dev = dev;
908         ps->file = file;
909         spin_lock_init(&ps->lock);
910         INIT_LIST_HEAD(&ps->list);
911         INIT_LIST_HEAD(&ps->async_pending);
912         INIT_LIST_HEAD(&ps->async_completed);
913         init_waitqueue_head(&ps->wait);
914         ps->discsignr = 0;
915         ps->disc_pid = get_pid(task_pid(current));
916         ps->cred = get_current_cred();
917         ps->disccontext = NULL;
918         ps->ifclaimed = 0;
919         security_task_getsecid(current, &ps->secid);
920         smp_wmb();
921         list_add_tail(&ps->list, &dev->filelist);
922         file->private_data = ps;
923         usb_unlock_device(dev);
924         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
925                         current->comm);
926         return ret;
927
928  out_unlock_device:
929         usb_unlock_device(dev);
930         usb_put_dev(dev);
931  out_free_ps:
932         kfree(ps);
933         return ret;
934 }
935
936 static int usbdev_release(struct inode *inode, struct file *file)
937 {
938         struct usb_dev_state *ps = file->private_data;
939         struct usb_device *dev = ps->dev;
940         unsigned int ifnum;
941         struct async *as;
942
943         usb_lock_device(dev);
944         usb_hub_release_all_ports(dev, ps);
945
946         list_del_init(&ps->list);
947
948         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
949                         ifnum++) {
950                 if (test_bit(ifnum, &ps->ifclaimed))
951                         releaseintf(ps, ifnum);
952         }
953         destroy_all_async(ps);
954         usb_autosuspend_device(dev);
955         usb_unlock_device(dev);
956         usb_put_dev(dev);
957         put_pid(ps->disc_pid);
958         put_cred(ps->cred);
959
960         as = async_getcompleted(ps);
961         while (as) {
962                 free_async(as);
963                 as = async_getcompleted(ps);
964         }
965         kfree(ps);
966         return 0;
967 }
968
969 static int proc_control(struct usb_dev_state *ps, void __user *arg)
970 {
971         struct usb_device *dev = ps->dev;
972         struct usbdevfs_ctrltransfer ctrl;
973         unsigned int tmo;
974         unsigned char *tbuf;
975         unsigned wLength;
976         int i, pipe, ret;
977
978         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
979                 return -EFAULT;
980         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
981                               ctrl.wIndex);
982         if (ret)
983                 return ret;
984         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
985         if (wLength > PAGE_SIZE)
986                 return -EINVAL;
987         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
988                         sizeof(struct usb_ctrlrequest));
989         if (ret)
990                 return ret;
991         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
992         if (!tbuf) {
993                 ret = -ENOMEM;
994                 goto done;
995         }
996         tmo = ctrl.timeout;
997         snoop(&dev->dev, "control urb: bRequestType=%02x "
998                 "bRequest=%02x wValue=%04x "
999                 "wIndex=%04x wLength=%04x\n",
1000                 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1001                 ctrl.wIndex, ctrl.wLength);
1002         if (ctrl.bRequestType & 0x80) {
1003                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1004                                                ctrl.wLength)) {
1005                         ret = -EINVAL;
1006                         goto done;
1007                 }
1008                 pipe = usb_rcvctrlpipe(dev, 0);
1009                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1010
1011                 usb_unlock_device(dev);
1012                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1013                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1014                                     tbuf, ctrl.wLength, tmo);
1015                 usb_lock_device(dev);
1016                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1017                           tbuf, max(i, 0));
1018                 if ((i > 0) && ctrl.wLength) {
1019                         if (copy_to_user(ctrl.data, tbuf, i)) {
1020                                 ret = -EFAULT;
1021                                 goto done;
1022                         }
1023                 }
1024         } else {
1025                 if (ctrl.wLength) {
1026                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1027                                 ret = -EFAULT;
1028                                 goto done;
1029                         }
1030                 }
1031                 pipe = usb_sndctrlpipe(dev, 0);
1032                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1033                         tbuf, ctrl.wLength);
1034
1035                 usb_unlock_device(dev);
1036                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1037                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1038                                     tbuf, ctrl.wLength, tmo);
1039                 usb_lock_device(dev);
1040                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1041         }
1042         if (i < 0 && i != -EPIPE) {
1043                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1044                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
1045                            current->comm, ctrl.bRequestType, ctrl.bRequest,
1046                            ctrl.wLength, i);
1047         }
1048         ret = i;
1049  done:
1050         free_page((unsigned long) tbuf);
1051         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1052                         sizeof(struct usb_ctrlrequest));
1053         return ret;
1054 }
1055
1056 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1057 {
1058         struct usb_device *dev = ps->dev;
1059         struct usbdevfs_bulktransfer bulk;
1060         unsigned int tmo, len1, pipe;
1061         int len2;
1062         unsigned char *tbuf;
1063         int i, ret;
1064
1065         if (copy_from_user(&bulk, arg, sizeof(bulk)))
1066                 return -EFAULT;
1067         ret = findintfep(ps->dev, bulk.ep);
1068         if (ret < 0)
1069                 return ret;
1070         ret = checkintf(ps, ret);
1071         if (ret)
1072                 return ret;
1073         if (bulk.ep & USB_DIR_IN)
1074                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1075         else
1076                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1077         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1078                 return -EINVAL;
1079         len1 = bulk.len;
1080         if (len1 >= USBFS_XFER_MAX)
1081                 return -EINVAL;
1082         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1083         if (ret)
1084                 return ret;
1085         tbuf = kmalloc(len1, GFP_KERNEL);
1086         if (!tbuf) {
1087                 ret = -ENOMEM;
1088                 goto done;
1089         }
1090         tmo = bulk.timeout;
1091         if (bulk.ep & 0x80) {
1092                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1093                         ret = -EINVAL;
1094                         goto done;
1095                 }
1096                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1097
1098                 usb_unlock_device(dev);
1099                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1100                 usb_lock_device(dev);
1101                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1102
1103                 if (!i && len2) {
1104                         if (copy_to_user(bulk.data, tbuf, len2)) {
1105                                 ret = -EFAULT;
1106                                 goto done;
1107                         }
1108                 }
1109         } else {
1110                 if (len1) {
1111                         if (copy_from_user(tbuf, bulk.data, len1)) {
1112                                 ret = -EFAULT;
1113                                 goto done;
1114                         }
1115                 }
1116                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1117
1118                 usb_unlock_device(dev);
1119                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1120                 usb_lock_device(dev);
1121                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1122         }
1123         ret = (i < 0 ? i : len2);
1124  done:
1125         kfree(tbuf);
1126         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1127         return ret;
1128 }
1129
1130 static void check_reset_of_active_ep(struct usb_device *udev,
1131                 unsigned int epnum, char *ioctl_name)
1132 {
1133         struct usb_host_endpoint **eps;
1134         struct usb_host_endpoint *ep;
1135
1136         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1137         ep = eps[epnum & 0x0f];
1138         if (ep && !list_empty(&ep->urb_list))
1139                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1140                                 task_pid_nr(current), current->comm,
1141                                 ioctl_name, epnum);
1142 }
1143
1144 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1145 {
1146         unsigned int ep;
1147         int ret;
1148
1149         if (get_user(ep, (unsigned int __user *)arg))
1150                 return -EFAULT;
1151         ret = findintfep(ps->dev, ep);
1152         if (ret < 0)
1153                 return ret;
1154         ret = checkintf(ps, ret);
1155         if (ret)
1156                 return ret;
1157         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1158         usb_reset_endpoint(ps->dev, ep);
1159         return 0;
1160 }
1161
1162 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1163 {
1164         unsigned int ep;
1165         int pipe;
1166         int ret;
1167
1168         if (get_user(ep, (unsigned int __user *)arg))
1169                 return -EFAULT;
1170         ret = findintfep(ps->dev, ep);
1171         if (ret < 0)
1172                 return ret;
1173         ret = checkintf(ps, ret);
1174         if (ret)
1175                 return ret;
1176         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1177         if (ep & USB_DIR_IN)
1178                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1179         else
1180                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1181
1182         return usb_clear_halt(ps->dev, pipe);
1183 }
1184
1185 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1186 {
1187         struct usbdevfs_getdriver gd;
1188         struct usb_interface *intf;
1189         int ret;
1190
1191         if (copy_from_user(&gd, arg, sizeof(gd)))
1192                 return -EFAULT;
1193         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1194         if (!intf || !intf->dev.driver)
1195                 ret = -ENODATA;
1196         else {
1197                 strlcpy(gd.driver, intf->dev.driver->name,
1198                                 sizeof(gd.driver));
1199                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1200         }
1201         return ret;
1202 }
1203
1204 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1205 {
1206         struct usbdevfs_connectinfo ci;
1207
1208         memset(&ci, 0, sizeof(ci));
1209         ci.devnum = ps->dev->devnum;
1210         ci.slow = ps->dev->speed == USB_SPEED_LOW;
1211
1212         if (copy_to_user(arg, &ci, sizeof(ci)))
1213                 return -EFAULT;
1214         return 0;
1215 }
1216
1217 static int proc_resetdevice(struct usb_dev_state *ps)
1218 {
1219         return usb_reset_device(ps->dev);
1220 }
1221
1222 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1223 {
1224         struct usbdevfs_setinterface setintf;
1225         int ret;
1226
1227         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1228                 return -EFAULT;
1229         ret = checkintf(ps, setintf.interface);
1230         if (ret)
1231                 return ret;
1232
1233         destroy_async_on_interface(ps, setintf.interface);
1234
1235         return usb_set_interface(ps->dev, setintf.interface,
1236                         setintf.altsetting);
1237 }
1238
1239 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1240 {
1241         int u;
1242         int status = 0;
1243         struct usb_host_config *actconfig;
1244
1245         if (get_user(u, (int __user *)arg))
1246                 return -EFAULT;
1247
1248         actconfig = ps->dev->actconfig;
1249
1250         /* Don't touch the device if any interfaces are claimed.
1251          * It could interfere with other drivers' operations, and if
1252          * an interface is claimed by usbfs it could easily deadlock.
1253          */
1254         if (actconfig) {
1255                 int i;
1256
1257                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1258                         if (usb_interface_claimed(actconfig->interface[i])) {
1259                                 dev_warn(&ps->dev->dev,
1260                                         "usbfs: interface %d claimed by %s "
1261                                         "while '%s' sets config #%d\n",
1262                                         actconfig->interface[i]
1263                                                 ->cur_altsetting
1264                                                 ->desc.bInterfaceNumber,
1265                                         actconfig->interface[i]
1266                                                 ->dev.driver->name,
1267                                         current->comm, u);
1268                                 status = -EBUSY;
1269                                 break;
1270                         }
1271                 }
1272         }
1273
1274         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1275          * so avoid usb_set_configuration()'s kick to sysfs
1276          */
1277         if (status == 0) {
1278                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1279                         status = usb_reset_configuration(ps->dev);
1280                 else
1281                         status = usb_set_configuration(ps->dev, u);
1282         }
1283
1284         return status;
1285 }
1286
1287 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1288                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1289                         void __user *arg)
1290 {
1291         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1292         struct usb_host_endpoint *ep;
1293         struct async *as = NULL;
1294         struct usb_ctrlrequest *dr = NULL;
1295         unsigned int u, totlen, isofrmlen;
1296         int i, ret, is_in, num_sgs = 0, ifnum = -1;
1297         int number_of_packets = 0;
1298         unsigned int stream_id = 0;
1299         void *buf;
1300
1301         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1302                                 USBDEVFS_URB_SHORT_NOT_OK |
1303                                 USBDEVFS_URB_BULK_CONTINUATION |
1304                                 USBDEVFS_URB_NO_FSBR |
1305                                 USBDEVFS_URB_ZERO_PACKET |
1306                                 USBDEVFS_URB_NO_INTERRUPT))
1307                 return -EINVAL;
1308         if (uurb->buffer_length > 0 && !uurb->buffer)
1309                 return -EINVAL;
1310         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1311             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1312                 ifnum = findintfep(ps->dev, uurb->endpoint);
1313                 if (ifnum < 0)
1314                         return ifnum;
1315                 ret = checkintf(ps, ifnum);
1316                 if (ret)
1317                         return ret;
1318         }
1319         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1320         if (!ep)
1321                 return -ENOENT;
1322         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1323
1324         u = 0;
1325         switch (uurb->type) {
1326         case USBDEVFS_URB_TYPE_CONTROL:
1327                 if (!usb_endpoint_xfer_control(&ep->desc))
1328                         return -EINVAL;
1329                 /* min 8 byte setup packet */
1330                 if (uurb->buffer_length < 8)
1331                         return -EINVAL;
1332                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1333                 if (!dr)
1334                         return -ENOMEM;
1335                 if (copy_from_user(dr, uurb->buffer, 8)) {
1336                         ret = -EFAULT;
1337                         goto error;
1338                 }
1339                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1340                         ret = -EINVAL;
1341                         goto error;
1342                 }
1343                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1344                                       le16_to_cpup(&dr->wIndex));
1345                 if (ret)
1346                         goto error;
1347                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1348                 uurb->buffer += 8;
1349                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1350                         is_in = 1;
1351                         uurb->endpoint |= USB_DIR_IN;
1352                 } else {
1353                         is_in = 0;
1354                         uurb->endpoint &= ~USB_DIR_IN;
1355                 }
1356                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1357                         "bRequest=%02x wValue=%04x "
1358                         "wIndex=%04x wLength=%04x\n",
1359                         dr->bRequestType, dr->bRequest,
1360                         __le16_to_cpup(&dr->wValue),
1361                         __le16_to_cpup(&dr->wIndex),
1362                         __le16_to_cpup(&dr->wLength));
1363                 u = sizeof(struct usb_ctrlrequest);
1364                 break;
1365
1366         case USBDEVFS_URB_TYPE_BULK:
1367                 switch (usb_endpoint_type(&ep->desc)) {
1368                 case USB_ENDPOINT_XFER_CONTROL:
1369                 case USB_ENDPOINT_XFER_ISOC:
1370                         return -EINVAL;
1371                 case USB_ENDPOINT_XFER_INT:
1372                         /* allow single-shot interrupt transfers */
1373                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1374                         goto interrupt_urb;
1375                 }
1376                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1377                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1378                         num_sgs = 0;
1379                 if (ep->streams)
1380                         stream_id = uurb->stream_id;
1381                 break;
1382
1383         case USBDEVFS_URB_TYPE_INTERRUPT:
1384                 if (!usb_endpoint_xfer_int(&ep->desc))
1385                         return -EINVAL;
1386  interrupt_urb:
1387                 break;
1388
1389         case USBDEVFS_URB_TYPE_ISO:
1390                 /* arbitrary limit */
1391                 if (uurb->number_of_packets < 1 ||
1392                     uurb->number_of_packets > 128)
1393                         return -EINVAL;
1394                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1395                         return -EINVAL;
1396                 number_of_packets = uurb->number_of_packets;
1397                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1398                                    number_of_packets;
1399                 isopkt = kmalloc(isofrmlen, GFP_KERNEL);
1400                 if (!isopkt)
1401                         return -ENOMEM;
1402                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1403                         ret = -EFAULT;
1404                         goto error;
1405                 }
1406                 for (totlen = u = 0; u < number_of_packets; u++) {
1407                         /*
1408                          * arbitrary limit need for USB 3.0
1409                          * bMaxBurst (0~15 allowed, 1~16 packets)
1410                          * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1411                          * sizemax: 1024 * 16 * 3 = 49152
1412                          */
1413                         if (isopkt[u].length > 49152) {
1414                                 ret = -EINVAL;
1415                                 goto error;
1416                         }
1417                         totlen += isopkt[u].length;
1418                 }
1419                 u *= sizeof(struct usb_iso_packet_descriptor);
1420                 uurb->buffer_length = totlen;
1421                 break;
1422
1423         default:
1424                 return -EINVAL;
1425         }
1426
1427         if (uurb->buffer_length >= USBFS_XFER_MAX) {
1428                 ret = -EINVAL;
1429                 goto error;
1430         }
1431         if (uurb->buffer_length > 0 &&
1432                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1433                                 uurb->buffer, uurb->buffer_length)) {
1434                 ret = -EFAULT;
1435                 goto error;
1436         }
1437         as = alloc_async(number_of_packets);
1438         if (!as) {
1439                 ret = -ENOMEM;
1440                 goto error;
1441         }
1442
1443         u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1444              num_sgs * sizeof(struct scatterlist);
1445         ret = usbfs_increase_memory_usage(u);
1446         if (ret)
1447                 goto error;
1448         as->mem_usage = u;
1449
1450         if (num_sgs) {
1451                 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1452                                       GFP_KERNEL);
1453                 if (!as->urb->sg) {
1454                         ret = -ENOMEM;
1455                         goto error;
1456                 }
1457                 as->urb->num_sgs = num_sgs;
1458                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1459
1460                 totlen = uurb->buffer_length;
1461                 for (i = 0; i < as->urb->num_sgs; i++) {
1462                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1463                         buf = kmalloc(u, GFP_KERNEL);
1464                         if (!buf) {
1465                                 ret = -ENOMEM;
1466                                 goto error;
1467                         }
1468                         sg_set_buf(&as->urb->sg[i], buf, u);
1469
1470                         if (!is_in) {
1471                                 if (copy_from_user(buf, uurb->buffer, u)) {
1472                                         ret = -EFAULT;
1473                                         goto error;
1474                                 }
1475                                 uurb->buffer += u;
1476                         }
1477                         totlen -= u;
1478                 }
1479         } else if (uurb->buffer_length > 0) {
1480                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1481                                 GFP_KERNEL);
1482                 if (!as->urb->transfer_buffer) {
1483                         ret = -ENOMEM;
1484                         goto error;
1485                 }
1486
1487                 if (!is_in) {
1488                         if (copy_from_user(as->urb->transfer_buffer,
1489                                            uurb->buffer,
1490                                            uurb->buffer_length)) {
1491                                 ret = -EFAULT;
1492                                 goto error;
1493                         }
1494                 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1495                         /*
1496                          * Isochronous input data may end up being
1497                          * discontiguous if some of the packets are short.
1498                          * Clear the buffer so that the gaps don't leak
1499                          * kernel data to userspace.
1500                          */
1501                         memset(as->urb->transfer_buffer, 0,
1502                                         uurb->buffer_length);
1503                 }
1504         }
1505         as->urb->dev = ps->dev;
1506         as->urb->pipe = (uurb->type << 30) |
1507                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1508                         (uurb->endpoint & USB_DIR_IN);
1509
1510         /* This tedious sequence is necessary because the URB_* flags
1511          * are internal to the kernel and subject to change, whereas
1512          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1513          */
1514         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1515         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1516                 u |= URB_ISO_ASAP;
1517         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
1518                 u |= URB_SHORT_NOT_OK;
1519         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1520                 u |= URB_NO_FSBR;
1521         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1522                 u |= URB_ZERO_PACKET;
1523         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1524                 u |= URB_NO_INTERRUPT;
1525         as->urb->transfer_flags = u;
1526
1527         as->urb->transfer_buffer_length = uurb->buffer_length;
1528         as->urb->setup_packet = (unsigned char *)dr;
1529         dr = NULL;
1530         as->urb->start_frame = uurb->start_frame;
1531         as->urb->number_of_packets = number_of_packets;
1532         as->urb->stream_id = stream_id;
1533
1534         if (ep->desc.bInterval) {
1535                 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1536                                 ps->dev->speed == USB_SPEED_HIGH ||
1537                                 ps->dev->speed >= USB_SPEED_SUPER)
1538                         as->urb->interval = 1 <<
1539                                         min(15, ep->desc.bInterval - 1);
1540                 else
1541                         as->urb->interval = ep->desc.bInterval;
1542         }
1543
1544         as->urb->context = as;
1545         as->urb->complete = async_completed;
1546         for (totlen = u = 0; u < number_of_packets; u++) {
1547                 as->urb->iso_frame_desc[u].offset = totlen;
1548                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1549                 totlen += isopkt[u].length;
1550         }
1551         kfree(isopkt);
1552         isopkt = NULL;
1553         as->ps = ps;
1554         as->userurb = arg;
1555         if (is_in && uurb->buffer_length > 0)
1556                 as->userbuffer = uurb->buffer;
1557         else
1558                 as->userbuffer = NULL;
1559         as->signr = uurb->signr;
1560         as->ifnum = ifnum;
1561         as->pid = get_pid(task_pid(current));
1562         as->cred = get_current_cred();
1563         security_task_getsecid(current, &as->secid);
1564         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1565                         as->urb->transfer_buffer_length, 0, SUBMIT,
1566                         NULL, 0);
1567         if (!is_in)
1568                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1569
1570         async_newpending(as);
1571
1572         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1573                 spin_lock_irq(&ps->lock);
1574
1575                 /* Not exactly the endpoint address; the direction bit is
1576                  * shifted to the 0x10 position so that the value will be
1577                  * between 0 and 31.
1578                  */
1579                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1580                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1581                                 >> 3);
1582
1583                 /* If this bulk URB is the start of a new transfer, re-enable
1584                  * the endpoint.  Otherwise mark it as a continuation URB.
1585                  */
1586                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1587                         as->bulk_status = AS_CONTINUATION;
1588                 else
1589                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1590
1591                 /* Don't accept continuation URBs if the endpoint is
1592                  * disabled because of an earlier error.
1593                  */
1594                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1595                         ret = -EREMOTEIO;
1596                 else
1597                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1598                 spin_unlock_irq(&ps->lock);
1599         } else {
1600                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1601         }
1602
1603         if (ret) {
1604                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1605                            "usbfs: usb_submit_urb returned %d\n", ret);
1606                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1607                                 0, ret, COMPLETE, NULL, 0);
1608                 async_removepending(as);
1609                 goto error;
1610         }
1611         return 0;
1612
1613  error:
1614         kfree(isopkt);
1615         kfree(dr);
1616         if (as)
1617                 free_async(as);
1618         return ret;
1619 }
1620
1621 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1622 {
1623         struct usbdevfs_urb uurb;
1624
1625         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1626                 return -EFAULT;
1627
1628         return proc_do_submiturb(ps, &uurb,
1629                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1630                         arg);
1631 }
1632
1633 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1634 {
1635         struct urb *urb;
1636         struct async *as;
1637         unsigned long flags;
1638
1639         spin_lock_irqsave(&ps->lock, flags);
1640         as = async_getpending(ps, arg);
1641         if (!as) {
1642                 spin_unlock_irqrestore(&ps->lock, flags);
1643                 return -EINVAL;
1644         }
1645
1646         urb = as->urb;
1647         usb_get_urb(urb);
1648         spin_unlock_irqrestore(&ps->lock, flags);
1649
1650         usb_kill_urb(urb);
1651         usb_put_urb(urb);
1652
1653         return 0;
1654 }
1655
1656 static int processcompl(struct async *as, void __user * __user *arg)
1657 {
1658         struct urb *urb = as->urb;
1659         struct usbdevfs_urb __user *userurb = as->userurb;
1660         void __user *addr = as->userurb;
1661         unsigned int i;
1662
1663         if (as->userbuffer && urb->actual_length) {
1664                 if (copy_urb_data_to_user(as->userbuffer, urb))
1665                         goto err_out;
1666         }
1667         if (put_user(as->status, &userurb->status))
1668                 goto err_out;
1669         if (put_user(urb->actual_length, &userurb->actual_length))
1670                 goto err_out;
1671         if (put_user(urb->error_count, &userurb->error_count))
1672                 goto err_out;
1673
1674         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1675                 for (i = 0; i < urb->number_of_packets; i++) {
1676                         if (put_user(urb->iso_frame_desc[i].actual_length,
1677                                      &userurb->iso_frame_desc[i].actual_length))
1678                                 goto err_out;
1679                         if (put_user(urb->iso_frame_desc[i].status,
1680                                      &userurb->iso_frame_desc[i].status))
1681                                 goto err_out;
1682                 }
1683         }
1684
1685         if (put_user(addr, (void __user * __user *)arg))
1686                 return -EFAULT;
1687         return 0;
1688
1689 err_out:
1690         return -EFAULT;
1691 }
1692
1693 static struct async *reap_as(struct usb_dev_state *ps)
1694 {
1695         DECLARE_WAITQUEUE(wait, current);
1696         struct async *as = NULL;
1697         struct usb_device *dev = ps->dev;
1698
1699         add_wait_queue(&ps->wait, &wait);
1700         for (;;) {
1701                 __set_current_state(TASK_INTERRUPTIBLE);
1702                 as = async_getcompleted(ps);
1703                 if (as || !connected(ps))
1704                         break;
1705                 if (signal_pending(current))
1706                         break;
1707                 usb_unlock_device(dev);
1708                 schedule();
1709                 usb_lock_device(dev);
1710         }
1711         remove_wait_queue(&ps->wait, &wait);
1712         set_current_state(TASK_RUNNING);
1713         return as;
1714 }
1715
1716 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1717 {
1718         struct async *as = reap_as(ps);
1719         if (as) {
1720                 int retval = processcompl(as, (void __user * __user *)arg);
1721                 free_async(as);
1722                 return retval;
1723         }
1724         if (signal_pending(current))
1725                 return -EINTR;
1726         return -ENODEV;
1727 }
1728
1729 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1730 {
1731         int retval;
1732         struct async *as;
1733
1734         as = async_getcompleted(ps);
1735         if (as) {
1736                 retval = processcompl(as, (void __user * __user *)arg);
1737                 free_async(as);
1738         } else {
1739                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1740         }
1741         return retval;
1742 }
1743
1744 #ifdef CONFIG_COMPAT
1745 static int proc_control_compat(struct usb_dev_state *ps,
1746                                 struct usbdevfs_ctrltransfer32 __user *p32)
1747 {
1748         struct usbdevfs_ctrltransfer __user *p;
1749         __u32 udata;
1750         p = compat_alloc_user_space(sizeof(*p));
1751         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1752             get_user(udata, &p32->data) ||
1753             put_user(compat_ptr(udata), &p->data))
1754                 return -EFAULT;
1755         return proc_control(ps, p);
1756 }
1757
1758 static int proc_bulk_compat(struct usb_dev_state *ps,
1759                         struct usbdevfs_bulktransfer32 __user *p32)
1760 {
1761         struct usbdevfs_bulktransfer __user *p;
1762         compat_uint_t n;
1763         compat_caddr_t addr;
1764
1765         p = compat_alloc_user_space(sizeof(*p));
1766
1767         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1768             get_user(n, &p32->len) || put_user(n, &p->len) ||
1769             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1770             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1771                 return -EFAULT;
1772
1773         return proc_bulk(ps, p);
1774 }
1775 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1776 {
1777         struct usbdevfs_disconnectsignal32 ds;
1778
1779         if (copy_from_user(&ds, arg, sizeof(ds)))
1780                 return -EFAULT;
1781         ps->discsignr = ds.signr;
1782         ps->disccontext = compat_ptr(ds.context);
1783         return 0;
1784 }
1785
1786 static int get_urb32(struct usbdevfs_urb *kurb,
1787                      struct usbdevfs_urb32 __user *uurb)
1788 {
1789         __u32  uptr;
1790         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1791             __get_user(kurb->type, &uurb->type) ||
1792             __get_user(kurb->endpoint, &uurb->endpoint) ||
1793             __get_user(kurb->status, &uurb->status) ||
1794             __get_user(kurb->flags, &uurb->flags) ||
1795             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1796             __get_user(kurb->actual_length, &uurb->actual_length) ||
1797             __get_user(kurb->start_frame, &uurb->start_frame) ||
1798             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1799             __get_user(kurb->error_count, &uurb->error_count) ||
1800             __get_user(kurb->signr, &uurb->signr))
1801                 return -EFAULT;
1802
1803         if (__get_user(uptr, &uurb->buffer))
1804                 return -EFAULT;
1805         kurb->buffer = compat_ptr(uptr);
1806         if (__get_user(uptr, &uurb->usercontext))
1807                 return -EFAULT;
1808         kurb->usercontext = compat_ptr(uptr);
1809
1810         return 0;
1811 }
1812
1813 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1814 {
1815         struct usbdevfs_urb uurb;
1816
1817         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1818                 return -EFAULT;
1819
1820         return proc_do_submiturb(ps, &uurb,
1821                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1822                         arg);
1823 }
1824
1825 static int processcompl_compat(struct async *as, void __user * __user *arg)
1826 {
1827         struct urb *urb = as->urb;
1828         struct usbdevfs_urb32 __user *userurb = as->userurb;
1829         void __user *addr = as->userurb;
1830         unsigned int i;
1831
1832         if (as->userbuffer && urb->actual_length) {
1833                 if (copy_urb_data_to_user(as->userbuffer, urb))
1834                         return -EFAULT;
1835         }
1836         if (put_user(as->status, &userurb->status))
1837                 return -EFAULT;
1838         if (put_user(urb->actual_length, &userurb->actual_length))
1839                 return -EFAULT;
1840         if (put_user(urb->error_count, &userurb->error_count))
1841                 return -EFAULT;
1842
1843         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1844                 for (i = 0; i < urb->number_of_packets; i++) {
1845                         if (put_user(urb->iso_frame_desc[i].actual_length,
1846                                      &userurb->iso_frame_desc[i].actual_length))
1847                                 return -EFAULT;
1848                         if (put_user(urb->iso_frame_desc[i].status,
1849                                      &userurb->iso_frame_desc[i].status))
1850                                 return -EFAULT;
1851                 }
1852         }
1853
1854         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1855                 return -EFAULT;
1856         return 0;
1857 }
1858
1859 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
1860 {
1861         struct async *as = reap_as(ps);
1862         if (as) {
1863                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1864                 free_async(as);
1865                 return retval;
1866         }
1867         if (signal_pending(current))
1868                 return -EINTR;
1869         return -ENODEV;
1870 }
1871
1872 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
1873 {
1874         int retval;
1875         struct async *as;
1876
1877         as = async_getcompleted(ps);
1878         if (as) {
1879                 retval = processcompl_compat(as, (void __user * __user *)arg);
1880                 free_async(as);
1881         } else {
1882                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1883         }
1884         return retval;
1885 }
1886
1887
1888 #endif
1889
1890 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
1891 {
1892         struct usbdevfs_disconnectsignal ds;
1893
1894         if (copy_from_user(&ds, arg, sizeof(ds)))
1895                 return -EFAULT;
1896         ps->discsignr = ds.signr;
1897         ps->disccontext = ds.context;
1898         return 0;
1899 }
1900
1901 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
1902 {
1903         unsigned int ifnum;
1904
1905         if (get_user(ifnum, (unsigned int __user *)arg))
1906                 return -EFAULT;
1907         return claimintf(ps, ifnum);
1908 }
1909
1910 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
1911 {
1912         unsigned int ifnum;
1913         int ret;
1914
1915         if (get_user(ifnum, (unsigned int __user *)arg))
1916                 return -EFAULT;
1917         ret = releaseintf(ps, ifnum);
1918         if (ret < 0)
1919                 return ret;
1920         destroy_async_on_interface (ps, ifnum);
1921         return 0;
1922 }
1923
1924 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
1925 {
1926         int                     size;
1927         void                    *buf = NULL;
1928         int                     retval = 0;
1929         struct usb_interface    *intf = NULL;
1930         struct usb_driver       *driver = NULL;
1931
1932         /* alloc buffer */
1933         size = _IOC_SIZE(ctl->ioctl_code);
1934         if (size > 0) {
1935                 buf = kmalloc(size, GFP_KERNEL);
1936                 if (buf == NULL)
1937                         return -ENOMEM;
1938                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1939                         if (copy_from_user(buf, ctl->data, size)) {
1940                                 kfree(buf);
1941                                 return -EFAULT;
1942                         }
1943                 } else {
1944                         memset(buf, 0, size);
1945                 }
1946         }
1947
1948         if (!connected(ps)) {
1949                 kfree(buf);
1950                 return -ENODEV;
1951         }
1952
1953         if (ps->dev->state != USB_STATE_CONFIGURED)
1954                 retval = -EHOSTUNREACH;
1955         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1956                 retval = -EINVAL;
1957         else switch (ctl->ioctl_code) {
1958
1959         /* disconnect kernel driver from interface */
1960         case USBDEVFS_DISCONNECT:
1961                 if (intf->dev.driver) {
1962                         driver = to_usb_driver(intf->dev.driver);
1963                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1964                         usb_driver_release_interface(driver, intf);
1965                 } else
1966                         retval = -ENODATA;
1967                 break;
1968
1969         /* let kernel drivers try to (re)bind to the interface */
1970         case USBDEVFS_CONNECT:
1971                 if (!intf->dev.driver)
1972                         retval = device_attach(&intf->dev);
1973                 else
1974                         retval = -EBUSY;
1975                 break;
1976
1977         /* talk directly to the interface's driver */
1978         default:
1979                 if (intf->dev.driver)
1980                         driver = to_usb_driver(intf->dev.driver);
1981                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1982                         retval = -ENOTTY;
1983                 } else {
1984                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1985                         if (retval == -ENOIOCTLCMD)
1986                                 retval = -ENOTTY;
1987                 }
1988         }
1989
1990         /* cleanup and return */
1991         if (retval >= 0
1992                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1993                         && size > 0
1994                         && copy_to_user(ctl->data, buf, size) != 0)
1995                 retval = -EFAULT;
1996
1997         kfree(buf);
1998         return retval;
1999 }
2000
2001 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2002 {
2003         struct usbdevfs_ioctl   ctrl;
2004
2005         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2006                 return -EFAULT;
2007         return proc_ioctl(ps, &ctrl);
2008 }
2009
2010 #ifdef CONFIG_COMPAT
2011 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2012 {
2013         struct usbdevfs_ioctl32 __user *uioc;
2014         struct usbdevfs_ioctl ctrl;
2015         u32 udata;
2016
2017         uioc = compat_ptr((long)arg);
2018         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
2019             __get_user(ctrl.ifno, &uioc->ifno) ||
2020             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
2021             __get_user(udata, &uioc->data))
2022                 return -EFAULT;
2023         ctrl.data = compat_ptr(udata);
2024
2025         return proc_ioctl(ps, &ctrl);
2026 }
2027 #endif
2028
2029 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2030 {
2031         unsigned portnum;
2032         int rc;
2033
2034         if (get_user(portnum, (unsigned __user *) arg))
2035                 return -EFAULT;
2036         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2037         if (rc == 0)
2038                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2039                         portnum, task_pid_nr(current), current->comm);
2040         return rc;
2041 }
2042
2043 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2044 {
2045         unsigned portnum;
2046
2047         if (get_user(portnum, (unsigned __user *) arg))
2048                 return -EFAULT;
2049         return usb_hub_release_port(ps->dev, portnum, ps);
2050 }
2051
2052 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2053 {
2054         __u32 caps;
2055
2056         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2057                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT;
2058         if (!ps->dev->bus->no_stop_on_short)
2059                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2060         if (ps->dev->bus->sg_tablesize)
2061                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2062
2063         if (put_user(caps, (__u32 __user *)arg))
2064                 return -EFAULT;
2065
2066         return 0;
2067 }
2068
2069 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2070 {
2071         struct usbdevfs_disconnect_claim dc;
2072         struct usb_interface *intf;
2073
2074         if (copy_from_user(&dc, arg, sizeof(dc)))
2075                 return -EFAULT;
2076
2077         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2078         if (!intf)
2079                 return -EINVAL;
2080
2081         if (intf->dev.driver) {
2082                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2083
2084                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2085                                 strncmp(dc.driver, intf->dev.driver->name,
2086                                         sizeof(dc.driver)) != 0)
2087                         return -EBUSY;
2088
2089                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2090                                 strncmp(dc.driver, intf->dev.driver->name,
2091                                         sizeof(dc.driver)) == 0)
2092                         return -EBUSY;
2093
2094                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2095                 usb_driver_release_interface(driver, intf);
2096         }
2097
2098         return claimintf(ps, dc.interface);
2099 }
2100
2101 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2102 {
2103         unsigned num_streams, num_eps;
2104         struct usb_host_endpoint **eps;
2105         struct usb_interface *intf;
2106         int r;
2107
2108         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2109                                    &eps, &intf);
2110         if (r)
2111                 return r;
2112
2113         destroy_async_on_interface(ps,
2114                                    intf->altsetting[0].desc.bInterfaceNumber);
2115
2116         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2117         kfree(eps);
2118         return r;
2119 }
2120
2121 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2122 {
2123         unsigned num_eps;
2124         struct usb_host_endpoint **eps;
2125         struct usb_interface *intf;
2126         int r;
2127
2128         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2129         if (r)
2130                 return r;
2131
2132         destroy_async_on_interface(ps,
2133                                    intf->altsetting[0].desc.bInterfaceNumber);
2134
2135         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2136         kfree(eps);
2137         return r;
2138 }
2139
2140 /*
2141  * NOTE:  All requests here that have interface numbers as parameters
2142  * are assuming that somehow the configuration has been prevented from
2143  * changing.  But there's no mechanism to ensure that...
2144  */
2145 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2146                                 void __user *p)
2147 {
2148         struct usb_dev_state *ps = file->private_data;
2149         struct inode *inode = file_inode(file);
2150         struct usb_device *dev = ps->dev;
2151         int ret = -ENOTTY;
2152
2153         if (!(file->f_mode & FMODE_WRITE))
2154                 return -EPERM;
2155
2156         usb_lock_device(dev);
2157
2158         /* Reap operations are allowed even after disconnection */
2159         switch (cmd) {
2160         case USBDEVFS_REAPURB:
2161                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2162                 ret = proc_reapurb(ps, p);
2163                 goto done;
2164
2165         case USBDEVFS_REAPURBNDELAY:
2166                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2167                 ret = proc_reapurbnonblock(ps, p);
2168                 goto done;
2169
2170 #ifdef CONFIG_COMPAT
2171         case USBDEVFS_REAPURB32:
2172                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2173                 ret = proc_reapurb_compat(ps, p);
2174                 goto done;
2175
2176         case USBDEVFS_REAPURBNDELAY32:
2177                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2178                 ret = proc_reapurbnonblock_compat(ps, p);
2179                 goto done;
2180 #endif
2181         }
2182
2183         if (!connected(ps)) {
2184                 usb_unlock_device(dev);
2185                 return -ENODEV;
2186         }
2187
2188         switch (cmd) {
2189         case USBDEVFS_CONTROL:
2190                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2191                 ret = proc_control(ps, p);
2192                 if (ret >= 0)
2193                         inode->i_mtime = CURRENT_TIME;
2194                 break;
2195
2196         case USBDEVFS_BULK:
2197                 snoop(&dev->dev, "%s: BULK\n", __func__);
2198                 ret = proc_bulk(ps, p);
2199                 if (ret >= 0)
2200                         inode->i_mtime = CURRENT_TIME;
2201                 break;
2202
2203         case USBDEVFS_RESETEP:
2204                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2205                 ret = proc_resetep(ps, p);
2206                 if (ret >= 0)
2207                         inode->i_mtime = CURRENT_TIME;
2208                 break;
2209
2210         case USBDEVFS_RESET:
2211                 snoop(&dev->dev, "%s: RESET\n", __func__);
2212                 ret = proc_resetdevice(ps);
2213                 break;
2214
2215         case USBDEVFS_CLEAR_HALT:
2216                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2217                 ret = proc_clearhalt(ps, p);
2218                 if (ret >= 0)
2219                         inode->i_mtime = CURRENT_TIME;
2220                 break;
2221
2222         case USBDEVFS_GETDRIVER:
2223                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2224                 ret = proc_getdriver(ps, p);
2225                 break;
2226
2227         case USBDEVFS_CONNECTINFO:
2228                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2229                 ret = proc_connectinfo(ps, p);
2230                 break;
2231
2232         case USBDEVFS_SETINTERFACE:
2233                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2234                 ret = proc_setintf(ps, p);
2235                 break;
2236
2237         case USBDEVFS_SETCONFIGURATION:
2238                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2239                 ret = proc_setconfig(ps, p);
2240                 break;
2241
2242         case USBDEVFS_SUBMITURB:
2243                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2244                 ret = proc_submiturb(ps, p);
2245                 if (ret >= 0)
2246                         inode->i_mtime = CURRENT_TIME;
2247                 break;
2248
2249 #ifdef CONFIG_COMPAT
2250         case USBDEVFS_CONTROL32:
2251                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2252                 ret = proc_control_compat(ps, p);
2253                 if (ret >= 0)
2254                         inode->i_mtime = CURRENT_TIME;
2255                 break;
2256
2257         case USBDEVFS_BULK32:
2258                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2259                 ret = proc_bulk_compat(ps, p);
2260                 if (ret >= 0)
2261                         inode->i_mtime = CURRENT_TIME;
2262                 break;
2263
2264         case USBDEVFS_DISCSIGNAL32:
2265                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2266                 ret = proc_disconnectsignal_compat(ps, p);
2267                 break;
2268
2269         case USBDEVFS_SUBMITURB32:
2270                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2271                 ret = proc_submiturb_compat(ps, p);
2272                 if (ret >= 0)
2273                         inode->i_mtime = CURRENT_TIME;
2274                 break;
2275
2276         case USBDEVFS_IOCTL32:
2277                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2278                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2279                 break;
2280 #endif
2281
2282         case USBDEVFS_DISCARDURB:
2283                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2284                 ret = proc_unlinkurb(ps, p);
2285                 break;
2286
2287         case USBDEVFS_DISCSIGNAL:
2288                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2289                 ret = proc_disconnectsignal(ps, p);
2290                 break;
2291
2292         case USBDEVFS_CLAIMINTERFACE:
2293                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2294                 ret = proc_claiminterface(ps, p);
2295                 break;
2296
2297         case USBDEVFS_RELEASEINTERFACE:
2298                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2299                 ret = proc_releaseinterface(ps, p);
2300                 break;
2301
2302         case USBDEVFS_IOCTL:
2303                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2304                 ret = proc_ioctl_default(ps, p);
2305                 break;
2306
2307         case USBDEVFS_CLAIM_PORT:
2308                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2309                 ret = proc_claim_port(ps, p);
2310                 break;
2311
2312         case USBDEVFS_RELEASE_PORT:
2313                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2314                 ret = proc_release_port(ps, p);
2315                 break;
2316         case USBDEVFS_GET_CAPABILITIES:
2317                 ret = proc_get_capabilities(ps, p);
2318                 break;
2319         case USBDEVFS_DISCONNECT_CLAIM:
2320                 ret = proc_disconnect_claim(ps, p);
2321                 break;
2322         case USBDEVFS_ALLOC_STREAMS:
2323                 ret = proc_alloc_streams(ps, p);
2324                 break;
2325         case USBDEVFS_FREE_STREAMS:
2326                 ret = proc_free_streams(ps, p);
2327                 break;
2328         }
2329
2330  done:
2331         usb_unlock_device(dev);
2332         if (ret >= 0)
2333                 inode->i_atime = CURRENT_TIME;
2334         return ret;
2335 }
2336
2337 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2338                         unsigned long arg)
2339 {
2340         int ret;
2341
2342         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2343
2344         return ret;
2345 }
2346
2347 #ifdef CONFIG_COMPAT
2348 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2349                         unsigned long arg)
2350 {
2351         int ret;
2352
2353         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2354
2355         return ret;
2356 }
2357 #endif
2358
2359 /* No kernel lock - fine */
2360 static unsigned int usbdev_poll(struct file *file,
2361                                 struct poll_table_struct *wait)
2362 {
2363         struct usb_dev_state *ps = file->private_data;
2364         unsigned int mask = 0;
2365
2366         poll_wait(file, &ps->wait, wait);
2367         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2368                 mask |= POLLOUT | POLLWRNORM;
2369         if (!connected(ps))
2370                 mask |= POLLERR | POLLHUP;
2371         return mask;
2372 }
2373
2374 const struct file_operations usbdev_file_operations = {
2375         .owner =          THIS_MODULE,
2376         .llseek =         usbdev_lseek,
2377         .read =           usbdev_read,
2378         .poll =           usbdev_poll,
2379         .unlocked_ioctl = usbdev_ioctl,
2380 #ifdef CONFIG_COMPAT
2381         .compat_ioctl =   usbdev_compat_ioctl,
2382 #endif
2383         .open =           usbdev_open,
2384         .release =        usbdev_release,
2385 };
2386
2387 static void usbdev_remove(struct usb_device *udev)
2388 {
2389         struct usb_dev_state *ps;
2390         struct siginfo sinfo;
2391
2392         while (!list_empty(&udev->filelist)) {
2393                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2394                 destroy_all_async(ps);
2395                 wake_up_all(&ps->wait);
2396                 list_del_init(&ps->list);
2397                 if (ps->discsignr) {
2398                         memset(&sinfo, 0, sizeof(sinfo));
2399                         sinfo.si_signo = ps->discsignr;
2400                         sinfo.si_errno = EPIPE;
2401                         sinfo.si_code = SI_ASYNCIO;
2402                         sinfo.si_addr = ps->disccontext;
2403                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2404                                         ps->disc_pid, ps->cred, ps->secid);
2405                 }
2406         }
2407 }
2408
2409 static int usbdev_notify(struct notifier_block *self,
2410                                unsigned long action, void *dev)
2411 {
2412         switch (action) {
2413         case USB_DEVICE_ADD:
2414                 break;
2415         case USB_DEVICE_REMOVE:
2416                 usbdev_remove(dev);
2417                 break;
2418         }
2419         return NOTIFY_OK;
2420 }
2421
2422 static struct notifier_block usbdev_nb = {
2423         .notifier_call =        usbdev_notify,
2424 };
2425
2426 static struct cdev usb_device_cdev;
2427
2428 int __init usb_devio_init(void)
2429 {
2430         int retval;
2431
2432         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2433                                         "usb_device");
2434         if (retval) {
2435                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2436                 goto out;
2437         }
2438         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2439         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2440         if (retval) {
2441                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2442                        USB_DEVICE_MAJOR);
2443                 goto error_cdev;
2444         }
2445         usb_register_notify(&usbdev_nb);
2446 out:
2447         return retval;
2448
2449 error_cdev:
2450         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2451         goto out;
2452 }
2453
2454 void usb_devio_cleanup(void)
2455 {
2456         usb_unregister_notify(&usbdev_nb);
2457         cdev_del(&usb_device_cdev);
2458         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2459 }