drivers/usb/core/devio.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*****************************************************************************/
   3
   4 /*
   5  *      devio.c  --  User space communication with USB devices.
   6  *
   7  *      Copyright (C) 1999-2000  Thomas Sailer ([email protected])
   8  *
   9  *  This file implements the usbfs/x/y files, where
  10  *  x is the bus number and y the device number.
  11  *
  12  *  It allows user space programs/"drivers" to communicate directly
  13  *  with USB devices without intervening kernel driver.
  14  *
  15  *  Revision history
  16  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  17  *    04.01.2000   0.2   Turned into its own filesystem
  18  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  19  *                       (CAN-2005-3055)
  20  */
  21
  22 /*****************************************************************************/
  23
  24 #include <linux/fs.h>
  25 #include <linux/mm.h>
  26 #include <linux/sched/signal.h>
  27 #include <linux/slab.h>
  28 #include <linux/signal.h>
  29 #include <linux/poll.h>
  30 #include <linux/module.h>
  31 #include <linux/string.h>
  32 #include <linux/usb.h>
  33 #include <linux/usbdevice_fs.h>
  34 #include <linux/usb/hcd.h>      /* for usbcore internals */
  35 #include <linux/cdev.h>
  36 #include <linux/notifier.h>
  37 #include <linux/security.h>
  38 #include <linux/user_namespace.h>
  39 #include <linux/scatterlist.h>
  40 #include <linux/uaccess.h>
  41 #include <linux/dma-mapping.h>
  42 #include <asm/byteorder.h>
  43 #include <linux/moduleparam.h>
  44
  45 #include "usb.h"
  46
  47 #define USB_MAXBUS                      64
  48 #define USB_DEVICE_MAX                  (USB_MAXBUS * 128)
  49 #define USB_SG_SIZE                     16384 /* split-size for large txs */
  50
  51 /* Mutual exclusion for removal, open, and release */
  52 DEFINE_MUTEX(usbfs_mutex);
  53
  54 struct usb_dev_state {
  55         struct list_head list;      /* state list */
  56         struct usb_device *dev;
  57         struct file *file;
  58         spinlock_t lock;            /* protects the async urb lists */
  59         struct list_head async_pending;
  60         struct list_head async_completed;
  61         struct list_head memory_list;
  62         wait_queue_head_t wait;     /* wake up if a request completed */
  63         unsigned int discsignr;
  64         struct pid *disc_pid;
  65         const struct cred *cred;
  66         void __user *disccontext;
  67         unsigned long ifclaimed;
  68         u32 disabled_bulk_eps;
  69         bool privileges_dropped;
  70         unsigned long interface_allowed_mask;
  71 };
  72
  73 struct usb_memory {
  74         struct list_head memlist;
  75         int vma_use_count;
  76         int urb_use_count;
  77         u32 size;
  78         void *mem;
  79         dma_addr_t dma_handle;
  80         unsigned long vm_start;
  81         struct usb_dev_state *ps;
  82 };
  83
  84 struct async {
  85         struct list_head asynclist;
  86         struct usb_dev_state *ps;
  87         struct pid *pid;
  88         const struct cred *cred;
  89         unsigned int signr;
  90         unsigned int ifnum;
  91         void __user *userbuffer;
  92         void __user *userurb;
  93         struct urb *urb;
  94         struct usb_memory *usbm;
  95         unsigned int mem_usage;
  96         int status;
  97         u8 bulk_addr;
  98         u8 bulk_status;
  99 };
 100
 101 static bool usbfs_snoop;
 102 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
 103 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
 104
 105 static unsigned usbfs_snoop_max = 65536;
 106 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
 107 MODULE_PARM_DESC(usbfs_snoop_max,
 108                 "maximum number of bytes to print while snooping");
 109
 110 #define snoop(dev, format, arg...)                              \
 111         do {                                                    \
 112                 if (usbfs_snoop)                                \
 113                         dev_info(dev, format, ## arg);          \
 114         } while (0)
 115
 116 enum snoop_when {
 117         SUBMIT, COMPLETE
 118 };
 119
 120 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 121
 122 /* Limit on the total amount of memory we can allocate for transfers */
 123 static u32 usbfs_memory_mb = 16;
 124 module_param(usbfs_memory_mb, uint, 0644);
 125 MODULE_PARM_DESC(usbfs_memory_mb,
 126                 "maximum MB allowed for usbfs buffers (0 = no limit)");
 127
 128 /* Hard limit, necessary to avoid arithmetic overflow */
 129 #define USBFS_XFER_MAX         (UINT_MAX / 2 - 1000000)
 130
 131 static atomic64_t usbfs_memory_usage;   /* Total memory currently allocated */
 132
 133 /* Check whether it's okay to allocate more memory for a transfer */
 134 static int usbfs_increase_memory_usage(u64 amount)
 135 {
 136         u64 lim;
 137
 138         lim = READ_ONCE(usbfs_memory_mb);
 139         lim <<= 20;
 140
 141         atomic64_add(amount, &usbfs_memory_usage);
 142
 143         if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
 144                 atomic64_sub(amount, &usbfs_memory_usage);
 145                 return -ENOMEM;
 146         }
 147
 148         return 0;
 149 }
 150
 151 /* Memory for a transfer is being deallocated */
 152 static void usbfs_decrease_memory_usage(u64 amount)
 153 {
 154         atomic64_sub(amount, &usbfs_memory_usage);
 155 }
 156
 157 static int connected(struct usb_dev_state *ps)
 158 {
 159         return (!list_empty(&ps->list) &&
 160                         ps->dev->state != USB_STATE_NOTATTACHED);
 161 }
 162
 163 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
 164 {
 165         struct usb_dev_state *ps = usbm->ps;
 166         unsigned long flags;
 167
 168         spin_lock_irqsave(&ps->lock, flags);
 169         --*count;
 170         if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
 171                 list_del(&usbm->memlist);
 172                 spin_unlock_irqrestore(&ps->lock, flags);
 173
 174                 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
 175                                 usbm->dma_handle);
 176                 usbfs_decrease_memory_usage(
 177                         usbm->size + sizeof(struct usb_memory));
 178                 kfree(usbm);
 179         } else {
 180                 spin_unlock_irqrestore(&ps->lock, flags);
 181         }
 182 }
 183
 184 static void usbdev_vm_open(struct vm_area_struct *vma)
 185 {
 186         struct usb_memory *usbm = vma->vm_private_data;
 187         unsigned long flags;
 188
 189         spin_lock_irqsave(&usbm->ps->lock, flags);
 190         ++usbm->vma_use_count;
 191         spin_unlock_irqrestore(&usbm->ps->lock, flags);
 192 }
 193
 194 static void usbdev_vm_close(struct vm_area_struct *vma)
 195 {
 196         struct usb_memory *usbm = vma->vm_private_data;
 197
 198         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 199 }
 200
 201 static const struct vm_operations_struct usbdev_vm_ops = {
 202         .open = usbdev_vm_open,
 203         .close = usbdev_vm_close
 204 };
 205
 206 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
 207 {
 208         struct usb_memory *usbm = NULL;
 209         struct usb_dev_state *ps = file->private_data;
 210         size_t size = vma->vm_end - vma->vm_start;
 211         void *mem;
 212         unsigned long flags;
 213         dma_addr_t dma_handle;
 214         int ret;
 215
 216         ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
 217         if (ret)
 218                 goto error;
 219
 220         usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
 221         if (!usbm) {
 222                 ret = -ENOMEM;
 223                 goto error_decrease_mem;
 224         }
 225
 226         mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
 227                         &dma_handle);
 228         if (!mem) {
 229                 ret = -ENOMEM;
 230                 goto error_free_usbm;
 231         }
 232
 233         memset(mem, 0, size);
 234
 235         usbm->mem = mem;
 236         usbm->dma_handle = dma_handle;
 237         usbm->size = size;
 238         usbm->ps = ps;
 239         usbm->vm_start = vma->vm_start;
 240         usbm->vma_use_count = 1;
 241         INIT_LIST_HEAD(&usbm->memlist);
 242
 243         if (remap_pfn_range(vma, vma->vm_start,
 244                         virt_to_phys(usbm->mem) >> PAGE_SHIFT,
 245                         size, vma->vm_page_prot) < 0) {
 246                 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 247                 return -EAGAIN;
 248         }
 249
 250         vma->vm_flags |= VM_IO;
 251         vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
 252         vma->vm_ops = &usbdev_vm_ops;
 253         vma->vm_private_data = usbm;
 254
 255         spin_lock_irqsave(&ps->lock, flags);
 256         list_add_tail(&usbm->memlist, &ps->memory_list);
 257         spin_unlock_irqrestore(&ps->lock, flags);
 258
 259         return 0;
 260
 261 error_free_usbm:
 262         kfree(usbm);
 263 error_decrease_mem:
 264         usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
 265 error:
 266         return ret;
 267 }
 268
 269 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 270                            loff_t *ppos)
 271 {
 272         struct usb_dev_state *ps = file->private_data;
 273         struct usb_device *dev = ps->dev;
 274         ssize_t ret = 0;
 275         unsigned len;
 276         loff_t pos;
 277         int i;
 278
 279         pos = *ppos;
 280         usb_lock_device(dev);
 281         if (!connected(ps)) {
 282                 ret = -ENODEV;
 283                 goto err;
 284         } else if (pos < 0) {
 285                 ret = -EINVAL;
 286                 goto err;
 287         }
 288
 289         if (pos < sizeof(struct usb_device_descriptor)) {
 290                 /* 18 bytes - fits on the stack */
 291                 struct usb_device_descriptor temp_desc;
 292
 293                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 294                 le16_to_cpus(&temp_desc.bcdUSB);
 295                 le16_to_cpus(&temp_desc.idVendor);
 296                 le16_to_cpus(&temp_desc.idProduct);
 297                 le16_to_cpus(&temp_desc.bcdDevice);
 298
 299                 len = sizeof(struct usb_device_descriptor) - pos;
 300                 if (len > nbytes)
 301                         len = nbytes;
 302                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 303                         ret = -EFAULT;
 304                         goto err;
 305                 }
 306
 307                 *ppos += len;
 308                 buf += len;
 309                 nbytes -= len;
 310                 ret += len;
 311         }
 312
 313         pos = sizeof(struct usb_device_descriptor);
 314         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 315                 struct usb_config_descriptor *config =
 316                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 317                 unsigned int length = le16_to_cpu(config->wTotalLength);
 318
 319                 if (*ppos < pos + length) {
 320
 321                         /* The descriptor may claim to be longer than it
 322                          * really is.  Here is the actual allocated length. */
 323                         unsigned alloclen =
 324                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 325
 326                         len = length - (*ppos - pos);
 327                         if (len > nbytes)
 328                                 len = nbytes;
 329
 330                         /* Simply don't write (skip over) unallocated parts */
 331                         if (alloclen > (*ppos - pos)) {
 332                                 alloclen -= (*ppos - pos);
 333                                 if (copy_to_user(buf,
 334                                     dev->rawdescriptors[i] + (*ppos - pos),
 335                                     min(len, alloclen))) {
 336                                         ret = -EFAULT;
 337                                         goto err;
 338                                 }
 339                         }
 340
 341                         *ppos += len;
 342                         buf += len;
 343                         nbytes -= len;
 344                         ret += len;
 345                 }
 346
 347                 pos += length;
 348         }
 349
 350 err:
 351         usb_unlock_device(dev);
 352         return ret;
 353 }
 354
 355 /*
 356  * async list handling
 357  */
 358
 359 static struct async *alloc_async(unsigned int numisoframes)
 360 {
 361         struct async *as;
 362
 363         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 364         if (!as)
 365                 return NULL;
 366         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 367         if (!as->urb) {
 368                 kfree(as);
 369                 return NULL;
 370         }
 371         return as;
 372 }
 373
 374 static void free_async(struct async *as)
 375 {
 376         int i;
 377
 378         put_pid(as->pid);
 379         if (as->cred)
 380                 put_cred(as->cred);
 381         for (i = 0; i < as->urb->num_sgs; i++) {
 382                 if (sg_page(&as->urb->sg[i]))
 383                         kfree(sg_virt(&as->urb->sg[i]));
 384         }
 385
 386         kfree(as->urb->sg);
 387         if (as->usbm == NULL)
 388                 kfree(as->urb->transfer_buffer);
 389         else
 390                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
 391
 392         kfree(as->urb->setup_packet);
 393         usb_free_urb(as->urb);
 394         usbfs_decrease_memory_usage(as->mem_usage);
 395         kfree(as);
 396 }
 397
 398 static void async_newpending(struct async *as)
 399 {
 400         struct usb_dev_state *ps = as->ps;
 401         unsigned long flags;
 402
 403         spin_lock_irqsave(&ps->lock, flags);
 404         list_add_tail(&as->asynclist, &ps->async_pending);
 405         spin_unlock_irqrestore(&ps->lock, flags);
 406 }
 407
 408 static void async_removepending(struct async *as)
 409 {
 410         struct usb_dev_state *ps = as->ps;
 411         unsigned long flags;
 412
 413         spin_lock_irqsave(&ps->lock, flags);
 414         list_del_init(&as->asynclist);
 415         spin_unlock_irqrestore(&ps->lock, flags);
 416 }
 417
 418 static struct async *async_getcompleted(struct usb_dev_state *ps)
 419 {
 420         unsigned long flags;
 421         struct async *as = NULL;
 422
 423         spin_lock_irqsave(&ps->lock, flags);
 424         if (!list_empty(&ps->async_completed)) {
 425                 as = list_entry(ps->async_completed.next, struct async,
 426                                 asynclist);
 427                 list_del_init(&as->asynclist);
 428         }
 429         spin_unlock_irqrestore(&ps->lock, flags);
 430         return as;
 431 }
 432
 433 static struct async *async_getpending(struct usb_dev_state *ps,
 434                                              void __user *userurb)
 435 {
 436         struct async *as;
 437
 438         list_for_each_entry(as, &ps->async_pending, asynclist)
 439                 if (as->userurb == userurb) {
 440                         list_del_init(&as->asynclist);
 441                         return as;
 442                 }
 443
 444         return NULL;
 445 }
 446
 447 static void snoop_urb(struct usb_device *udev,
 448                 void __user *userurb, int pipe, unsigned length,
 449                 int timeout_or_status, enum snoop_when when,
 450                 unsigned char *data, unsigned data_len)
 451 {
 452         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 453         static const char *dirs[] = {"out", "in"};
 454         int ep;
 455         const char *t, *d;
 456
 457         if (!usbfs_snoop)
 458                 return;
 459
 460         ep = usb_pipeendpoint(pipe);
 461         t = types[usb_pipetype(pipe)];
 462         d = dirs[!!usb_pipein(pipe)];
 463
 464         if (userurb) {          /* Async */
 465                 if (when == SUBMIT)
 466                         dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
 467                                         "length %u\n",
 468                                         userurb, ep, t, d, length);
 469                 else
 470                         dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
 471                                         "actual_length %u status %d\n",
 472                                         userurb, ep, t, d, length,
 473                                         timeout_or_status);
 474         } else {
 475                 if (when == SUBMIT)
 476                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 477                                         "timeout %d\n",
 478                                         ep, t, d, length, timeout_or_status);
 479                 else
 480                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 481                                         "status %d\n",
 482                                         ep, t, d, length, timeout_or_status);
 483         }
 484
 485         data_len = min(data_len, usbfs_snoop_max);
 486         if (data && data_len > 0) {
 487                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 488                         data, data_len, 1);
 489         }
 490 }
 491
 492 static void snoop_urb_data(struct urb *urb, unsigned len)
 493 {
 494         int i, size;
 495
 496         len = min(len, usbfs_snoop_max);
 497         if (!usbfs_snoop || len == 0)
 498                 return;
 499
 500         if (urb->num_sgs == 0) {
 501                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 502                         urb->transfer_buffer, len, 1);
 503                 return;
 504         }
 505
 506         for (i = 0; i < urb->num_sgs && len; i++) {
 507                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 508                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 509                         sg_virt(&urb->sg[i]), size, 1);
 510                 len -= size;
 511         }
 512 }
 513
 514 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
 515 {
 516         unsigned i, len, size;
 517
 518         if (urb->number_of_packets > 0)         /* Isochronous */
 519                 len = urb->transfer_buffer_length;
 520         else                                    /* Non-Isoc */
 521                 len = urb->actual_length;
 522
 523         if (urb->num_sgs == 0) {
 524                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
 525                         return -EFAULT;
 526                 return 0;
 527         }
 528
 529         for (i = 0; i < urb->num_sgs && len; i++) {
 530                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 531                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
 532                         return -EFAULT;
 533                 userbuffer += size;
 534                 len -= size;
 535         }
 536
 537         return 0;
 538 }
 539
 540 #define AS_CONTINUATION 1
 541 #define AS_UNLINK       2
 542
 543 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
 544 __releases(ps->lock)
 545 __acquires(ps->lock)
 546 {
 547         struct urb *urb;
 548         struct async *as;
 549
 550         /* Mark all the pending URBs that match bulk_addr, up to but not
 551          * including the first one without AS_CONTINUATION.  If such an
 552          * URB is encountered then a new transfer has already started so
 553          * the endpoint doesn't need to be disabled; otherwise it does.
 554          */
 555         list_for_each_entry(as, &ps->async_pending, asynclist) {
 556                 if (as->bulk_addr == bulk_addr) {
 557                         if (as->bulk_status != AS_CONTINUATION)
 558                                 goto rescan;
 559                         as->bulk_status = AS_UNLINK;
 560                         as->bulk_addr = 0;
 561                 }
 562         }
 563         ps->disabled_bulk_eps |= (1 << bulk_addr);
 564
 565         /* Now carefully unlink all the marked pending URBs */
 566  rescan:
 567         list_for_each_entry(as, &ps->async_pending, asynclist) {
 568                 if (as->bulk_status == AS_UNLINK) {
 569                         as->bulk_status = 0;            /* Only once */
 570                         urb = as->urb;
 571                         usb_get_urb(urb);
 572                         spin_unlock(&ps->lock);         /* Allow completions */
 573                         usb_unlink_urb(urb);
 574                         usb_put_urb(urb);
 575                         spin_lock(&ps->lock);
 576                         goto rescan;
 577                 }
 578         }
 579 }
 580
 581 static void async_completed(struct urb *urb)
 582 {
 583         struct async *as = urb->context;
 584         struct usb_dev_state *ps = as->ps;
 585         struct siginfo sinfo;
 586         struct pid *pid = NULL;
 587         const struct cred *cred = NULL;
 588         unsigned long flags;
 589         int signr;
 590
 591         spin_lock_irqsave(&ps->lock, flags);
 592         list_move_tail(&as->asynclist, &ps->async_completed);
 593         as->status = urb->status;
 594         signr = as->signr;
 595         if (signr) {
 596                 clear_siginfo(&sinfo);
 597                 sinfo.si_signo = as->signr;
 598                 sinfo.si_errno = as->status;
 599                 sinfo.si_code = SI_ASYNCIO;
 600                 sinfo.si_addr = as->userurb;
 601                 pid = get_pid(as->pid);
 602                 cred = get_cred(as->cred);
 603         }
 604         snoop(&urb->dev->dev, "urb complete\n");
 605         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 606                         as->status, COMPLETE, NULL, 0);
 607         if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
 608                 snoop_urb_data(urb, urb->actual_length);
 609
 610         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 611                         as->status != -ENOENT)
 612                 cancel_bulk_urbs(ps, as->bulk_addr);
 613
 614         wake_up(&ps->wait);
 615         spin_unlock_irqrestore(&ps->lock, flags);
 616
 617         if (signr) {
 618                 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred);
 619                 put_pid(pid);
 620                 put_cred(cred);
 621         }
 622 }
 623
 624 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
 625 {
 626         struct urb *urb;
 627         struct async *as;
 628         unsigned long flags;
 629
 630         spin_lock_irqsave(&ps->lock, flags);
 631         while (!list_empty(list)) {
 632                 as = list_entry(list->next, struct async, asynclist);
 633                 list_del_init(&as->asynclist);
 634                 urb = as->urb;
 635                 usb_get_urb(urb);
 636
 637                 /* drop the spinlock so the completion handler can run */
 638                 spin_unlock_irqrestore(&ps->lock, flags);
 639                 usb_kill_urb(urb);
 640                 usb_put_urb(urb);
 641                 spin_lock_irqsave(&ps->lock, flags);
 642         }
 643         spin_unlock_irqrestore(&ps->lock, flags);
 644 }
 645
 646 static void destroy_async_on_interface(struct usb_dev_state *ps,
 647                                        unsigned int ifnum)
 648 {
 649         struct list_head *p, *q, hitlist;
 650         unsigned long flags;
 651
 652         INIT_LIST_HEAD(&hitlist);
 653         spin_lock_irqsave(&ps->lock, flags);
 654         list_for_each_safe(p, q, &ps->async_pending)
 655                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 656                         list_move_tail(p, &hitlist);
 657         spin_unlock_irqrestore(&ps->lock, flags);
 658         destroy_async(ps, &hitlist);
 659 }
 660
 661 static void destroy_all_async(struct usb_dev_state *ps)
 662 {
 663         destroy_async(ps, &ps->async_pending);
 664 }
 665
 666 /*
 667  * interface claims are made only at the request of user level code,
 668  * which can also release them (explicitly or by closing files).
 669  * they're also undone when devices disconnect.
 670  */
 671
 672 static int driver_probe(struct usb_interface *intf,
 673                         const struct usb_device_id *id)
 674 {
 675         return -ENODEV;
 676 }
 677
 678 static void driver_disconnect(struct usb_interface *intf)
 679 {
 680         struct usb_dev_state *ps = usb_get_intfdata(intf);
 681         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 682
 683         if (!ps)
 684                 return;
 685
 686         /* NOTE:  this relies on usbcore having canceled and completed
 687          * all pending I/O requests; 2.6 does that.
 688          */
 689
 690         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 691                 clear_bit(ifnum, &ps->ifclaimed);
 692         else
 693                 dev_warn(&intf->dev, "interface number %u out of range\n",
 694                          ifnum);
 695
 696         usb_set_intfdata(intf, NULL);
 697
 698         /* force async requests to complete */
 699         destroy_async_on_interface(ps, ifnum);
 700 }
 701
 702 /* The following routines are merely placeholders.  There is no way
 703  * to inform a user task about suspend or resumes.
 704  */
 705 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 706 {
 707         return 0;
 708 }
 709
 710 static int driver_resume(struct usb_interface *intf)
 711 {
 712         return 0;
 713 }
 714
 715 struct usb_driver usbfs_driver = {
 716         .name =         "usbfs",
 717         .probe =        driver_probe,
 718         .disconnect =   driver_disconnect,
 719         .suspend =      driver_suspend,
 720         .resume =       driver_resume,
 721 };
 722
 723 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
 724 {
 725         struct usb_device *dev = ps->dev;
 726         struct usb_interface *intf;
 727         int err;
 728
 729         if (ifnum >= 8*sizeof(ps->ifclaimed))
 730                 return -EINVAL;
 731         /* already claimed */
 732         if (test_bit(ifnum, &ps->ifclaimed))
 733                 return 0;
 734
 735         if (ps->privileges_dropped &&
 736                         !test_bit(ifnum, &ps->interface_allowed_mask))
 737                 return -EACCES;
 738
 739         intf = usb_ifnum_to_if(dev, ifnum);
 740         if (!intf)
 741                 err = -ENOENT;
 742         else
 743                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 744         if (err == 0)
 745                 set_bit(ifnum, &ps->ifclaimed);
 746         return err;
 747 }
 748
 749 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
 750 {
 751         struct usb_device *dev;
 752         struct usb_interface *intf;
 753         int err;
 754
 755         err = -EINVAL;
 756         if (ifnum >= 8*sizeof(ps->ifclaimed))
 757                 return err;
 758         dev = ps->dev;
 759         intf = usb_ifnum_to_if(dev, ifnum);
 760         if (!intf)
 761                 err = -ENOENT;
 762         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 763                 usb_driver_release_interface(&usbfs_driver, intf);
 764                 err = 0;
 765         }
 766         return err;
 767 }
 768
 769 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
 770 {
 771         if (ps->dev->state != USB_STATE_CONFIGURED)
 772                 return -EHOSTUNREACH;
 773         if (ifnum >= 8*sizeof(ps->ifclaimed))
 774                 return -EINVAL;
 775         if (test_bit(ifnum, &ps->ifclaimed))
 776                 return 0;
 777         /* if not yet claimed, claim it for the driver */
 778         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 779                  "interface %u before use\n", task_pid_nr(current),
 780                  current->comm, ifnum);
 781         return claimintf(ps, ifnum);
 782 }
 783
 784 static int findintfep(struct usb_device *dev, unsigned int ep)
 785 {
 786         unsigned int i, j, e;
 787         struct usb_interface *intf;
 788         struct usb_host_interface *alts;
 789         struct usb_endpoint_descriptor *endpt;
 790
 791         if (ep & ~(USB_DIR_IN|0xf))
 792                 return -EINVAL;
 793         if (!dev->actconfig)
 794                 return -ESRCH;
 795         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 796                 intf = dev->actconfig->interface[i];
 797                 for (j = 0; j < intf->num_altsetting; j++) {
 798                         alts = &intf->altsetting[j];
 799                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 800                                 endpt = &alts->endpoint[e].desc;
 801                                 if (endpt->bEndpointAddress == ep)
 802                                         return alts->desc.bInterfaceNumber;
 803                         }
 804                 }
 805         }
 806         return -ENOENT;
 807 }
 808
 809 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
 810                            unsigned int request, unsigned int index)
 811 {
 812         int ret = 0;
 813         struct usb_host_interface *alt_setting;
 814
 815         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 816          && ps->dev->state != USB_STATE_ADDRESS
 817          && ps->dev->state != USB_STATE_CONFIGURED)
 818                 return -EHOSTUNREACH;
 819         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 820                 return 0;
 821
 822         /*
 823          * check for the special corner case 'get_device_id' in the printer
 824          * class specification, which we always want to allow as it is used
 825          * to query things like ink level, etc.
 826          */
 827         if (requesttype == 0xa1 && request == 0) {
 828                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 829                                                    index >> 8, index & 0xff);
 830                 if (alt_setting
 831                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 832                         return 0;
 833         }
 834
 835         index &= 0xff;
 836         switch (requesttype & USB_RECIP_MASK) {
 837         case USB_RECIP_ENDPOINT:
 838                 if ((index & ~USB_DIR_IN) == 0)
 839                         return 0;
 840                 ret = findintfep(ps->dev, index);
 841                 if (ret < 0) {
 842                         /*
 843                          * Some not fully compliant Win apps seem to get
 844                          * index wrong and have the endpoint number here
 845                          * rather than the endpoint address (with the
 846                          * correct direction). Win does let this through,
 847                          * so we'll not reject it here but leave it to
 848                          * the device to not break KVM. But we warn.
 849                          */
 850                         ret = findintfep(ps->dev, index ^ 0x80);
 851                         if (ret >= 0)
 852                                 dev_info(&ps->dev->dev,
 853                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 854                                         __func__, task_pid_nr(current),
 855                                         current->comm, index, index ^ 0x80);
 856                 }
 857                 if (ret >= 0)
 858                         ret = checkintf(ps, ret);
 859                 break;
 860
 861         case USB_RECIP_INTERFACE:
 862                 ret = checkintf(ps, index);
 863                 break;
 864         }
 865         return ret;
 866 }
 867
 868 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
 869                                                      unsigned char ep)
 870 {
 871         if (ep & USB_ENDPOINT_DIR_MASK)
 872                 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
 873         else
 874                 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
 875 }
 876
 877 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
 878                                   struct usbdevfs_streams __user *streams,
 879                                   unsigned int *num_streams_ret,
 880                                   unsigned int *num_eps_ret,
 881                                   struct usb_host_endpoint ***eps_ret,
 882                                   struct usb_interface **intf_ret)
 883 {
 884         unsigned int i, num_streams, num_eps;
 885         struct usb_host_endpoint **eps;
 886         struct usb_interface *intf = NULL;
 887         unsigned char ep;
 888         int ifnum, ret;
 889
 890         if (get_user(num_streams, &streams->num_streams) ||
 891             get_user(num_eps, &streams->num_eps))
 892                 return -EFAULT;
 893
 894         if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
 895                 return -EINVAL;
 896
 897         /* The XHCI controller allows max 2 ^ 16 streams */
 898         if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
 899                 return -EINVAL;
 900
 901         eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
 902         if (!eps)
 903                 return -ENOMEM;
 904
 905         for (i = 0; i < num_eps; i++) {
 906                 if (get_user(ep, &streams->eps[i])) {
 907                         ret = -EFAULT;
 908                         goto error;
 909                 }
 910                 eps[i] = ep_to_host_endpoint(ps->dev, ep);
 911                 if (!eps[i]) {
 912                         ret = -EINVAL;
 913                         goto error;
 914                 }
 915
 916                 /* usb_alloc/free_streams operate on an usb_interface */
 917                 ifnum = findintfep(ps->dev, ep);
 918                 if (ifnum < 0) {
 919                         ret = ifnum;
 920                         goto error;
 921                 }
 922
 923                 if (i == 0) {
 924                         ret = checkintf(ps, ifnum);
 925                         if (ret < 0)
 926                                 goto error;
 927                         intf = usb_ifnum_to_if(ps->dev, ifnum);
 928                 } else {
 929                         /* Verify all eps belong to the same interface */
 930                         if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
 931                                 ret = -EINVAL;
 932                                 goto error;
 933                         }
 934                 }
 935         }
 936
 937         if (num_streams_ret)
 938                 *num_streams_ret = num_streams;
 939         *num_eps_ret = num_eps;
 940         *eps_ret = eps;
 941         *intf_ret = intf;
 942
 943         return 0;
 944
 945 error:
 946         kfree(eps);
 947         return ret;
 948 }
 949
 950 static int match_devt(struct device *dev, void *data)
 951 {
 952         return dev->devt == (dev_t) (unsigned long) data;
 953 }
 954
 955 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 956 {
 957         struct device *dev;
 958
 959         dev = bus_find_device(&usb_bus_type, NULL,
 960                               (void *) (unsigned long) devt, match_devt);
 961         if (!dev)
 962                 return NULL;
 963         return to_usb_device(dev);
 964 }
 965
 966 /*
 967  * file operations
 968  */
 969 static int usbdev_open(struct inode *inode, struct file *file)
 970 {
 971         struct usb_device *dev = NULL;
 972         struct usb_dev_state *ps;
 973         int ret;
 974
 975         ret = -ENOMEM;
 976         ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
 977         if (!ps)
 978                 goto out_free_ps;
 979
 980         ret = -ENODEV;
 981
 982         /* Protect against simultaneous removal or release */
 983         mutex_lock(&usbfs_mutex);
 984
 985         /* usbdev device-node */
 986         if (imajor(inode) == USB_DEVICE_MAJOR)
 987                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 988
 989         mutex_unlock(&usbfs_mutex);
 990
 991         if (!dev)
 992                 goto out_free_ps;
 993
 994         usb_lock_device(dev);
 995         if (dev->state == USB_STATE_NOTATTACHED)
 996                 goto out_unlock_device;
 997
 998         ret = usb_autoresume_device(dev);
 999         if (ret)
1000                 goto out_unlock_device;
1001
1002         ps->dev = dev;
1003         ps->file = file;
1004         ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1005         spin_lock_init(&ps->lock);
1006         INIT_LIST_HEAD(&ps->list);
1007         INIT_LIST_HEAD(&ps->async_pending);
1008         INIT_LIST_HEAD(&ps->async_completed);
1009         INIT_LIST_HEAD(&ps->memory_list);
1010         init_waitqueue_head(&ps->wait);
1011         ps->disc_pid = get_pid(task_pid(current));
1012         ps->cred = get_current_cred();
1013         smp_wmb();
1014         list_add_tail(&ps->list, &dev->filelist);
1015         file->private_data = ps;
1016         usb_unlock_device(dev);
1017         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1018                         current->comm);
1019         return ret;
1020
1021  out_unlock_device:
1022         usb_unlock_device(dev);
1023         usb_put_dev(dev);
1024  out_free_ps:
1025         kfree(ps);
1026         return ret;
1027 }
1028
1029 static int usbdev_release(struct inode *inode, struct file *file)
1030 {
1031         struct usb_dev_state *ps = file->private_data;
1032         struct usb_device *dev = ps->dev;
1033         unsigned int ifnum;
1034         struct async *as;
1035
1036         usb_lock_device(dev);
1037         usb_hub_release_all_ports(dev, ps);
1038
1039         list_del_init(&ps->list);
1040
1041         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1042                         ifnum++) {
1043                 if (test_bit(ifnum, &ps->ifclaimed))
1044                         releaseintf(ps, ifnum);
1045         }
1046         destroy_all_async(ps);
1047         usb_autosuspend_device(dev);
1048         usb_unlock_device(dev);
1049         usb_put_dev(dev);
1050         put_pid(ps->disc_pid);
1051         put_cred(ps->cred);
1052
1053         as = async_getcompleted(ps);
1054         while (as) {
1055                 free_async(as);
1056                 as = async_getcompleted(ps);
1057         }
1058
1059         kfree(ps);
1060         return 0;
1061 }
1062
1063 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1064 {
1065         struct usb_device *dev = ps->dev;
1066         struct usbdevfs_ctrltransfer ctrl;
1067         unsigned int tmo;
1068         unsigned char *tbuf;
1069         unsigned wLength;
1070         int i, pipe, ret;
1071
1072         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1073                 return -EFAULT;
1074         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1075                               ctrl.wIndex);
1076         if (ret)
1077                 return ret;
1078         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
1079         if (wLength > PAGE_SIZE)
1080                 return -EINVAL;
1081         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1082                         sizeof(struct usb_ctrlrequest));
1083         if (ret)
1084                 return ret;
1085         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1086         if (!tbuf) {
1087                 ret = -ENOMEM;
1088                 goto done;
1089         }
1090         tmo = ctrl.timeout;
1091         snoop(&dev->dev, "control urb: bRequestType=%02x "
1092                 "bRequest=%02x wValue=%04x "
1093                 "wIndex=%04x wLength=%04x\n",
1094                 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1095                 ctrl.wIndex, ctrl.wLength);
1096         if (ctrl.bRequestType & 0x80) {
1097                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1098                                                ctrl.wLength)) {
1099                         ret = -EINVAL;
1100                         goto done;
1101                 }
1102                 pipe = usb_rcvctrlpipe(dev, 0);
1103                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1104
1105                 usb_unlock_device(dev);
1106                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1107                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1108                                     tbuf, ctrl.wLength, tmo);
1109                 usb_lock_device(dev);
1110                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1111                           tbuf, max(i, 0));
1112                 if ((i > 0) && ctrl.wLength) {
1113                         if (copy_to_user(ctrl.data, tbuf, i)) {
1114                                 ret = -EFAULT;
1115                                 goto done;
1116                         }
1117                 }
1118         } else {
1119                 if (ctrl.wLength) {
1120                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1121                                 ret = -EFAULT;
1122                                 goto done;
1123                         }
1124                 }
1125                 pipe = usb_sndctrlpipe(dev, 0);
1126                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1127                         tbuf, ctrl.wLength);
1128
1129                 usb_unlock_device(dev);
1130                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1131                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1132                                     tbuf, ctrl.wLength, tmo);
1133                 usb_lock_device(dev);
1134                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1135         }
1136         if (i < 0 && i != -EPIPE) {
1137                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1138                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
1139                            current->comm, ctrl.bRequestType, ctrl.bRequest,
1140                            ctrl.wLength, i);
1141         }
1142         ret = i;
1143  done:
1144         free_page((unsigned long) tbuf);
1145         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1146                         sizeof(struct usb_ctrlrequest));
1147         return ret;
1148 }
1149
1150 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1151 {
1152         struct usb_device *dev = ps->dev;
1153         struct usbdevfs_bulktransfer bulk;
1154         unsigned int tmo, len1, pipe;
1155         int len2;
1156         unsigned char *tbuf;
1157         int i, ret;
1158
1159         if (copy_from_user(&bulk, arg, sizeof(bulk)))
1160                 return -EFAULT;
1161         ret = findintfep(ps->dev, bulk.ep);
1162         if (ret < 0)
1163                 return ret;
1164         ret = checkintf(ps, ret);
1165         if (ret)
1166                 return ret;
1167         if (bulk.ep & USB_DIR_IN)
1168                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1169         else
1170                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1171         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1172                 return -EINVAL;
1173         len1 = bulk.len;
1174         if (len1 >= (INT_MAX - sizeof(struct urb)))
1175                 return -EINVAL;
1176         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1177         if (ret)
1178                 return ret;
1179         tbuf = kmalloc(len1, GFP_KERNEL);
1180         if (!tbuf) {
1181                 ret = -ENOMEM;
1182                 goto done;
1183         }
1184         tmo = bulk.timeout;
1185         if (bulk.ep & 0x80) {
1186                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1187                         ret = -EINVAL;
1188                         goto done;
1189                 }
1190                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1191
1192                 usb_unlock_device(dev);
1193                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1194                 usb_lock_device(dev);
1195                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1196
1197                 if (!i && len2) {
1198                         if (copy_to_user(bulk.data, tbuf, len2)) {
1199                                 ret = -EFAULT;
1200                                 goto done;
1201                         }
1202                 }
1203         } else {
1204                 if (len1) {
1205                         if (copy_from_user(tbuf, bulk.data, len1)) {
1206                                 ret = -EFAULT;
1207                                 goto done;
1208                         }
1209                 }
1210                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1211
1212                 usb_unlock_device(dev);
1213                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1214                 usb_lock_device(dev);
1215                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1216         }
1217         ret = (i < 0 ? i : len2);
1218  done:
1219         kfree(tbuf);
1220         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1221         return ret;
1222 }
1223
1224 static void check_reset_of_active_ep(struct usb_device *udev,
1225                 unsigned int epnum, char *ioctl_name)
1226 {
1227         struct usb_host_endpoint **eps;
1228         struct usb_host_endpoint *ep;
1229
1230         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1231         ep = eps[epnum & 0x0f];
1232         if (ep && !list_empty(&ep->urb_list))
1233                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1234                                 task_pid_nr(current), current->comm,
1235                                 ioctl_name, epnum);
1236 }
1237
1238 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1239 {
1240         unsigned int ep;
1241         int ret;
1242
1243         if (get_user(ep, (unsigned int __user *)arg))
1244                 return -EFAULT;
1245         ret = findintfep(ps->dev, ep);
1246         if (ret < 0)
1247                 return ret;
1248         ret = checkintf(ps, ret);
1249         if (ret)
1250                 return ret;
1251         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1252         usb_reset_endpoint(ps->dev, ep);
1253         return 0;
1254 }
1255
1256 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1257 {
1258         unsigned int ep;
1259         int pipe;
1260         int ret;
1261
1262         if (get_user(ep, (unsigned int __user *)arg))
1263                 return -EFAULT;
1264         ret = findintfep(ps->dev, ep);
1265         if (ret < 0)
1266                 return ret;
1267         ret = checkintf(ps, ret);
1268         if (ret)
1269                 return ret;
1270         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1271         if (ep & USB_DIR_IN)
1272                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1273         else
1274                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1275
1276         return usb_clear_halt(ps->dev, pipe);
1277 }
1278
1279 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1280 {
1281         struct usbdevfs_getdriver gd;
1282         struct usb_interface *intf;
1283         int ret;
1284
1285         if (copy_from_user(&gd, arg, sizeof(gd)))
1286                 return -EFAULT;
1287         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1288         if (!intf || !intf->dev.driver)
1289                 ret = -ENODATA;
1290         else {
1291                 strlcpy(gd.driver, intf->dev.driver->name,
1292                                 sizeof(gd.driver));
1293                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1294         }
1295         return ret;
1296 }
1297
1298 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1299 {
1300         struct usbdevfs_connectinfo ci;
1301
1302         memset(&ci, 0, sizeof(ci));
1303         ci.devnum = ps->dev->devnum;
1304         ci.slow = ps->dev->speed == USB_SPEED_LOW;
1305
1306         if (copy_to_user(arg, &ci, sizeof(ci)))
1307                 return -EFAULT;
1308         return 0;
1309 }
1310
1311 static int proc_resetdevice(struct usb_dev_state *ps)
1312 {
1313         struct usb_host_config *actconfig = ps->dev->actconfig;
1314         struct usb_interface *interface;
1315         int i, number;
1316
1317         /* Don't allow a device reset if the process has dropped the
1318          * privilege to do such things and any of the interfaces are
1319          * currently claimed.
1320          */
1321         if (ps->privileges_dropped && actconfig) {
1322                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1323                         interface = actconfig->interface[i];
1324                         number = interface->cur_altsetting->desc.bInterfaceNumber;
1325                         if (usb_interface_claimed(interface) &&
1326                                         !test_bit(number, &ps->ifclaimed)) {
1327                                 dev_warn(&ps->dev->dev,
1328                                         "usbfs: interface %d claimed by %s while '%s' resets device\n",
1329                                         number, interface->dev.driver->name, current->comm);
1330                                 return -EACCES;
1331                         }
1332                 }
1333         }
1334
1335         return usb_reset_device(ps->dev);
1336 }
1337
1338 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1339 {
1340         struct usbdevfs_setinterface setintf;
1341         int ret;
1342
1343         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1344                 return -EFAULT;
1345         ret = checkintf(ps, setintf.interface);
1346         if (ret)
1347                 return ret;
1348
1349         destroy_async_on_interface(ps, setintf.interface);
1350
1351         return usb_set_interface(ps->dev, setintf.interface,
1352                         setintf.altsetting);
1353 }
1354
1355 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1356 {
1357         int u;
1358         int status = 0;
1359         struct usb_host_config *actconfig;
1360
1361         if (get_user(u, (int __user *)arg))
1362                 return -EFAULT;
1363
1364         actconfig = ps->dev->actconfig;
1365
1366         /* Don't touch the device if any interfaces are claimed.
1367          * It could interfere with other drivers' operations, and if
1368          * an interface is claimed by usbfs it could easily deadlock.
1369          */
1370         if (actconfig) {
1371                 int i;
1372
1373                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1374                         if (usb_interface_claimed(actconfig->interface[i])) {
1375                                 dev_warn(&ps->dev->dev,
1376                                         "usbfs: interface %d claimed by %s "
1377                                         "while '%s' sets config #%d\n",
1378                                         actconfig->interface[i]
1379                                                 ->cur_altsetting
1380                                                 ->desc.bInterfaceNumber,
1381                                         actconfig->interface[i]
1382                                                 ->dev.driver->name,
1383                                         current->comm, u);
1384                                 status = -EBUSY;
1385                                 break;
1386                         }
1387                 }
1388         }
1389
1390         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1391          * so avoid usb_set_configuration()'s kick to sysfs
1392          */
1393         if (status == 0) {
1394                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1395                         status = usb_reset_configuration(ps->dev);
1396                 else
1397                         status = usb_set_configuration(ps->dev, u);
1398         }
1399
1400         return status;
1401 }
1402
1403 static struct usb_memory *
1404 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1405 {
1406         struct usb_memory *usbm = NULL, *iter;
1407         unsigned long flags;
1408         unsigned long uurb_start = (unsigned long)uurb->buffer;
1409
1410         spin_lock_irqsave(&ps->lock, flags);
1411         list_for_each_entry(iter, &ps->memory_list, memlist) {
1412                 if (uurb_start >= iter->vm_start &&
1413                                 uurb_start < iter->vm_start + iter->size) {
1414                         if (uurb->buffer_length > iter->vm_start + iter->size -
1415                                         uurb_start) {
1416                                 usbm = ERR_PTR(-EINVAL);
1417                         } else {
1418                                 usbm = iter;
1419                                 usbm->urb_use_count++;
1420                         }
1421                         break;
1422                 }
1423         }
1424         spin_unlock_irqrestore(&ps->lock, flags);
1425         return usbm;
1426 }
1427
1428 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1429                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1430                         void __user *arg)
1431 {
1432         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1433         struct usb_host_endpoint *ep;
1434         struct async *as = NULL;
1435         struct usb_ctrlrequest *dr = NULL;
1436         unsigned int u, totlen, isofrmlen;
1437         int i, ret, is_in, num_sgs = 0, ifnum = -1;
1438         int number_of_packets = 0;
1439         unsigned int stream_id = 0;
1440         void *buf;
1441         unsigned long mask =    USBDEVFS_URB_SHORT_NOT_OK |
1442                                 USBDEVFS_URB_BULK_CONTINUATION |
1443                                 USBDEVFS_URB_NO_FSBR |
1444                                 USBDEVFS_URB_ZERO_PACKET |
1445                                 USBDEVFS_URB_NO_INTERRUPT;
1446         /* USBDEVFS_URB_ISO_ASAP is a special case */
1447         if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1448                 mask |= USBDEVFS_URB_ISO_ASAP;
1449
1450         if (uurb->flags & ~mask)
1451                         return -EINVAL;
1452
1453         if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1454                 return -EINVAL;
1455         if (uurb->buffer_length > 0 && !uurb->buffer)
1456                 return -EINVAL;
1457         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1458             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1459                 ifnum = findintfep(ps->dev, uurb->endpoint);
1460                 if (ifnum < 0)
1461                         return ifnum;
1462                 ret = checkintf(ps, ifnum);
1463                 if (ret)
1464                         return ret;
1465         }
1466         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1467         if (!ep)
1468                 return -ENOENT;
1469         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1470
1471         u = 0;
1472         switch (uurb->type) {
1473         case USBDEVFS_URB_TYPE_CONTROL:
1474                 if (!usb_endpoint_xfer_control(&ep->desc))
1475                         return -EINVAL;
1476                 /* min 8 byte setup packet */
1477                 if (uurb->buffer_length < 8)
1478                         return -EINVAL;
1479                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1480                 if (!dr)
1481                         return -ENOMEM;
1482                 if (copy_from_user(dr, uurb->buffer, 8)) {
1483                         ret = -EFAULT;
1484                         goto error;
1485                 }
1486                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1487                         ret = -EINVAL;
1488                         goto error;
1489                 }
1490                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1491                                       le16_to_cpup(&dr->wIndex));
1492                 if (ret)
1493                         goto error;
1494                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1495                 uurb->buffer += 8;
1496                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1497                         is_in = 1;
1498                         uurb->endpoint |= USB_DIR_IN;
1499                 } else {
1500                         is_in = 0;
1501                         uurb->endpoint &= ~USB_DIR_IN;
1502                 }
1503                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1504                         "bRequest=%02x wValue=%04x "
1505                         "wIndex=%04x wLength=%04x\n",
1506                         dr->bRequestType, dr->bRequest,
1507                         __le16_to_cpup(&dr->wValue),
1508                         __le16_to_cpup(&dr->wIndex),
1509                         __le16_to_cpup(&dr->wLength));
1510                 u = sizeof(struct usb_ctrlrequest);
1511                 break;
1512
1513         case USBDEVFS_URB_TYPE_BULK:
1514                 switch (usb_endpoint_type(&ep->desc)) {
1515                 case USB_ENDPOINT_XFER_CONTROL:
1516                 case USB_ENDPOINT_XFER_ISOC:
1517                         return -EINVAL;
1518                 case USB_ENDPOINT_XFER_INT:
1519                         /* allow single-shot interrupt transfers */
1520                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1521                         goto interrupt_urb;
1522                 }
1523                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1524                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1525                         num_sgs = 0;
1526                 if (ep->streams)
1527                         stream_id = uurb->stream_id;
1528                 break;
1529
1530         case USBDEVFS_URB_TYPE_INTERRUPT:
1531                 if (!usb_endpoint_xfer_int(&ep->desc))
1532                         return -EINVAL;
1533  interrupt_urb:
1534                 break;
1535
1536         case USBDEVFS_URB_TYPE_ISO:
1537                 /* arbitrary limit */
1538                 if (uurb->number_of_packets < 1 ||
1539                     uurb->number_of_packets > 128)
1540                         return -EINVAL;
1541                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1542                         return -EINVAL;
1543                 number_of_packets = uurb->number_of_packets;
1544                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1545                                    number_of_packets;
1546                 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1547                 if (IS_ERR(isopkt)) {
1548                         ret = PTR_ERR(isopkt);
1549                         isopkt = NULL;
1550                         goto error;
1551                 }
1552                 for (totlen = u = 0; u < number_of_packets; u++) {
1553                         /*
1554                          * arbitrary limit need for USB 3.0
1555                          * bMaxBurst (0~15 allowed, 1~16 packets)
1556                          * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1557                          * sizemax: 1024 * 16 * 3 = 49152
1558                          */
1559                         if (isopkt[u].length > 49152) {
1560                                 ret = -EINVAL;
1561                                 goto error;
1562                         }
1563                         totlen += isopkt[u].length;
1564                 }
1565                 u *= sizeof(struct usb_iso_packet_descriptor);
1566                 uurb->buffer_length = totlen;
1567                 break;
1568
1569         default:
1570                 return -EINVAL;
1571         }
1572
1573         if (uurb->buffer_length > 0 &&
1574                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1575                                 uurb->buffer, uurb->buffer_length)) {
1576                 ret = -EFAULT;
1577                 goto error;
1578         }
1579         as = alloc_async(number_of_packets);
1580         if (!as) {
1581                 ret = -ENOMEM;
1582                 goto error;
1583         }
1584
1585         as->usbm = find_memory_area(ps, uurb);
1586         if (IS_ERR(as->usbm)) {
1587                 ret = PTR_ERR(as->usbm);
1588                 as->usbm = NULL;
1589                 goto error;
1590         }
1591
1592         /* do not use SG buffers when memory mapped segments
1593          * are in use
1594          */
1595         if (as->usbm)
1596                 num_sgs = 0;
1597
1598         u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1599              num_sgs * sizeof(struct scatterlist);
1600         ret = usbfs_increase_memory_usage(u);
1601         if (ret)
1602                 goto error;
1603         as->mem_usage = u;
1604
1605         if (num_sgs) {
1606                 as->urb->sg = kmalloc_array(num_sgs,
1607                                             sizeof(struct scatterlist),
1608                                             GFP_KERNEL);
1609                 if (!as->urb->sg) {
1610                         ret = -ENOMEM;
1611                         goto error;
1612                 }
1613                 as->urb->num_sgs = num_sgs;
1614                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1615
1616                 totlen = uurb->buffer_length;
1617                 for (i = 0; i < as->urb->num_sgs; i++) {
1618                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1619                         buf = kmalloc(u, GFP_KERNEL);
1620                         if (!buf) {
1621                                 ret = -ENOMEM;
1622                                 goto error;
1623                         }
1624                         sg_set_buf(&as->urb->sg[i], buf, u);
1625
1626                         if (!is_in) {
1627                                 if (copy_from_user(buf, uurb->buffer, u)) {
1628                                         ret = -EFAULT;
1629                                         goto error;
1630                                 }
1631                                 uurb->buffer += u;
1632                         }
1633                         totlen -= u;
1634                 }
1635         } else if (uurb->buffer_length > 0) {
1636                 if (as->usbm) {
1637                         unsigned long uurb_start = (unsigned long)uurb->buffer;
1638
1639                         as->urb->transfer_buffer = as->usbm->mem +
1640                                         (uurb_start - as->usbm->vm_start);
1641                 } else {
1642                         as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1643                                         GFP_KERNEL);
1644                         if (!as->urb->transfer_buffer) {
1645                                 ret = -ENOMEM;
1646                                 goto error;
1647                         }
1648                         if (!is_in) {
1649                                 if (copy_from_user(as->urb->transfer_buffer,
1650                                                    uurb->buffer,
1651                                                    uurb->buffer_length)) {
1652                                         ret = -EFAULT;
1653                                         goto error;
1654                                 }
1655                         } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1656                                 /*
1657                                  * Isochronous input data may end up being
1658                                  * discontiguous if some of the packets are
1659                                  * short. Clear the buffer so that the gaps
1660                                  * don't leak kernel data to userspace.
1661                                  */
1662                                 memset(as->urb->transfer_buffer, 0,
1663                                                 uurb->buffer_length);
1664                         }
1665                 }
1666         }
1667         as->urb->dev = ps->dev;
1668         as->urb->pipe = (uurb->type << 30) |
1669                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1670                         (uurb->endpoint & USB_DIR_IN);
1671
1672         /* This tedious sequence is necessary because the URB_* flags
1673          * are internal to the kernel and subject to change, whereas
1674          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1675          */
1676         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1677         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1678                 u |= URB_ISO_ASAP;
1679         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
1680                 u |= URB_SHORT_NOT_OK;
1681         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1682                 u |= URB_ZERO_PACKET;
1683         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1684                 u |= URB_NO_INTERRUPT;
1685         as->urb->transfer_flags = u;
1686
1687         as->urb->transfer_buffer_length = uurb->buffer_length;
1688         as->urb->setup_packet = (unsigned char *)dr;
1689         dr = NULL;
1690         as->urb->start_frame = uurb->start_frame;
1691         as->urb->number_of_packets = number_of_packets;
1692         as->urb->stream_id = stream_id;
1693
1694         if (ep->desc.bInterval) {
1695                 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1696                                 ps->dev->speed == USB_SPEED_HIGH ||
1697                                 ps->dev->speed >= USB_SPEED_SUPER)
1698                         as->urb->interval = 1 <<
1699                                         min(15, ep->desc.bInterval - 1);
1700                 else
1701                         as->urb->interval = ep->desc.bInterval;
1702         }
1703
1704         as->urb->context = as;
1705         as->urb->complete = async_completed;
1706         for (totlen = u = 0; u < number_of_packets; u++) {
1707                 as->urb->iso_frame_desc[u].offset = totlen;
1708                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1709                 totlen += isopkt[u].length;
1710         }
1711         kfree(isopkt);
1712         isopkt = NULL;
1713         as->ps = ps;
1714         as->userurb = arg;
1715         if (as->usbm) {
1716                 unsigned long uurb_start = (unsigned long)uurb->buffer;
1717
1718                 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1719                 as->urb->transfer_dma = as->usbm->dma_handle +
1720                                 (uurb_start - as->usbm->vm_start);
1721         } else if (is_in && uurb->buffer_length > 0)
1722                 as->userbuffer = uurb->buffer;
1723         as->signr = uurb->signr;
1724         as->ifnum = ifnum;
1725         as->pid = get_pid(task_pid(current));
1726         as->cred = get_current_cred();
1727         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1728                         as->urb->transfer_buffer_length, 0, SUBMIT,
1729                         NULL, 0);
1730         if (!is_in)
1731                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1732
1733         async_newpending(as);
1734
1735         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1736                 spin_lock_irq(&ps->lock);
1737
1738                 /* Not exactly the endpoint address; the direction bit is
1739                  * shifted to the 0x10 position so that the value will be
1740                  * between 0 and 31.
1741                  */
1742                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1743                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1744                                 >> 3);
1745
1746                 /* If this bulk URB is the start of a new transfer, re-enable
1747                  * the endpoint.  Otherwise mark it as a continuation URB.
1748                  */
1749                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1750                         as->bulk_status = AS_CONTINUATION;
1751                 else
1752                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1753
1754                 /* Don't accept continuation URBs if the endpoint is
1755                  * disabled because of an earlier error.
1756                  */
1757                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1758                         ret = -EREMOTEIO;
1759                 else
1760                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1761                 spin_unlock_irq(&ps->lock);
1762         } else {
1763                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1764         }
1765
1766         if (ret) {
1767                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1768                            "usbfs: usb_submit_urb returned %d\n", ret);
1769                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1770                                 0, ret, COMPLETE, NULL, 0);
1771                 async_removepending(as);
1772                 goto error;
1773         }
1774         return 0;
1775
1776  error:
1777         if (as && as->usbm)
1778                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
1779         kfree(isopkt);
1780         kfree(dr);
1781         if (as)
1782                 free_async(as);
1783         return ret;
1784 }
1785
1786 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1787 {
1788         struct usbdevfs_urb uurb;
1789
1790         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1791                 return -EFAULT;
1792
1793         return proc_do_submiturb(ps, &uurb,
1794                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1795                         arg);
1796 }
1797
1798 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1799 {
1800         struct urb *urb;
1801         struct async *as;
1802         unsigned long flags;
1803
1804         spin_lock_irqsave(&ps->lock, flags);
1805         as = async_getpending(ps, arg);
1806         if (!as) {
1807                 spin_unlock_irqrestore(&ps->lock, flags);
1808                 return -EINVAL;
1809         }
1810
1811         urb = as->urb;
1812         usb_get_urb(urb);
1813         spin_unlock_irqrestore(&ps->lock, flags);
1814
1815         usb_kill_urb(urb);
1816         usb_put_urb(urb);
1817
1818         return 0;
1819 }
1820
1821 static void compute_isochronous_actual_length(struct urb *urb)
1822 {
1823         unsigned int i;
1824
1825         if (urb->number_of_packets > 0) {
1826                 urb->actual_length = 0;
1827                 for (i = 0; i < urb->number_of_packets; i++)
1828                         urb->actual_length +=
1829                                         urb->iso_frame_desc[i].actual_length;
1830         }
1831 }
1832
1833 static int processcompl(struct async *as, void __user * __user *arg)
1834 {
1835         struct urb *urb = as->urb;
1836         struct usbdevfs_urb __user *userurb = as->userurb;
1837         void __user *addr = as->userurb;
1838         unsigned int i;
1839
1840         compute_isochronous_actual_length(urb);
1841         if (as->userbuffer && urb->actual_length) {
1842                 if (copy_urb_data_to_user(as->userbuffer, urb))
1843                         goto err_out;
1844         }
1845         if (put_user(as->status, &userurb->status))
1846                 goto err_out;
1847         if (put_user(urb->actual_length, &userurb->actual_length))
1848                 goto err_out;
1849         if (put_user(urb->error_count, &userurb->error_count))
1850                 goto err_out;
1851
1852         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1853                 for (i = 0; i < urb->number_of_packets; i++) {
1854                         if (put_user(urb->iso_frame_desc[i].actual_length,
1855                                      &userurb->iso_frame_desc[i].actual_length))
1856                                 goto err_out;
1857                         if (put_user(urb->iso_frame_desc[i].status,
1858                                      &userurb->iso_frame_desc[i].status))
1859                                 goto err_out;
1860                 }
1861         }
1862
1863         if (put_user(addr, (void __user * __user *)arg))
1864                 return -EFAULT;
1865         return 0;
1866
1867 err_out:
1868         return -EFAULT;
1869 }
1870
1871 static struct async *reap_as(struct usb_dev_state *ps)
1872 {
1873         DECLARE_WAITQUEUE(wait, current);
1874         struct async *as = NULL;
1875         struct usb_device *dev = ps->dev;
1876
1877         add_wait_queue(&ps->wait, &wait);
1878         for (;;) {
1879                 __set_current_state(TASK_INTERRUPTIBLE);
1880                 as = async_getcompleted(ps);
1881                 if (as || !connected(ps))
1882                         break;
1883                 if (signal_pending(current))
1884                         break;
1885                 usb_unlock_device(dev);
1886                 schedule();
1887                 usb_lock_device(dev);
1888         }
1889         remove_wait_queue(&ps->wait, &wait);
1890         set_current_state(TASK_RUNNING);
1891         return as;
1892 }
1893
1894 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1895 {
1896         struct async *as = reap_as(ps);
1897
1898         if (as) {
1899                 int retval;
1900
1901                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1902                 retval = processcompl(as, (void __user * __user *)arg);
1903                 free_async(as);
1904                 return retval;
1905         }
1906         if (signal_pending(current))
1907                 return -EINTR;
1908         return -ENODEV;
1909 }
1910
1911 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1912 {
1913         int retval;
1914         struct async *as;
1915
1916         as = async_getcompleted(ps);
1917         if (as) {
1918                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1919                 retval = processcompl(as, (void __user * __user *)arg);
1920                 free_async(as);
1921         } else {
1922                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1923         }
1924         return retval;
1925 }
1926
1927 #ifdef CONFIG_COMPAT
1928 static int proc_control_compat(struct usb_dev_state *ps,
1929                                 struct usbdevfs_ctrltransfer32 __user *p32)
1930 {
1931         struct usbdevfs_ctrltransfer __user *p;
1932         __u32 udata;
1933         p = compat_alloc_user_space(sizeof(*p));
1934         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1935             get_user(udata, &p32->data) ||
1936             put_user(compat_ptr(udata), &p->data))
1937                 return -EFAULT;
1938         return proc_control(ps, p);
1939 }
1940
1941 static int proc_bulk_compat(struct usb_dev_state *ps,
1942                         struct usbdevfs_bulktransfer32 __user *p32)
1943 {
1944         struct usbdevfs_bulktransfer __user *p;
1945         compat_uint_t n;
1946         compat_caddr_t addr;
1947
1948         p = compat_alloc_user_space(sizeof(*p));
1949
1950         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1951             get_user(n, &p32->len) || put_user(n, &p->len) ||
1952             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1953             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1954                 return -EFAULT;
1955
1956         return proc_bulk(ps, p);
1957 }
1958 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1959 {
1960         struct usbdevfs_disconnectsignal32 ds;
1961
1962         if (copy_from_user(&ds, arg, sizeof(ds)))
1963                 return -EFAULT;
1964         ps->discsignr = ds.signr;
1965         ps->disccontext = compat_ptr(ds.context);
1966         return 0;
1967 }
1968
1969 static int get_urb32(struct usbdevfs_urb *kurb,
1970                      struct usbdevfs_urb32 __user *uurb)
1971 {
1972         struct usbdevfs_urb32 urb32;
1973         if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
1974                 return -EFAULT;
1975         kurb->type = urb32.type;
1976         kurb->endpoint = urb32.endpoint;
1977         kurb->status = urb32.status;
1978         kurb->flags = urb32.flags;
1979         kurb->buffer = compat_ptr(urb32.buffer);
1980         kurb->buffer_length = urb32.buffer_length;
1981         kurb->actual_length = urb32.actual_length;
1982         kurb->start_frame = urb32.start_frame;
1983         kurb->number_of_packets = urb32.number_of_packets;
1984         kurb->error_count = urb32.error_count;
1985         kurb->signr = urb32.signr;
1986         kurb->usercontext = compat_ptr(urb32.usercontext);
1987         return 0;
1988 }
1989
1990 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1991 {
1992         struct usbdevfs_urb uurb;
1993
1994         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1995                 return -EFAULT;
1996
1997         return proc_do_submiturb(ps, &uurb,
1998                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1999                         arg);
2000 }
2001
2002 static int processcompl_compat(struct async *as, void __user * __user *arg)
2003 {
2004         struct urb *urb = as->urb;
2005         struct usbdevfs_urb32 __user *userurb = as->userurb;
2006         void __user *addr = as->userurb;
2007         unsigned int i;
2008
2009         compute_isochronous_actual_length(urb);
2010         if (as->userbuffer && urb->actual_length) {
2011                 if (copy_urb_data_to_user(as->userbuffer, urb))
2012                         return -EFAULT;
2013         }
2014         if (put_user(as->status, &userurb->status))
2015                 return -EFAULT;
2016         if (put_user(urb->actual_length, &userurb->actual_length))
2017                 return -EFAULT;
2018         if (put_user(urb->error_count, &userurb->error_count))
2019                 return -EFAULT;
2020
2021         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2022                 for (i = 0; i < urb->number_of_packets; i++) {
2023                         if (put_user(urb->iso_frame_desc[i].actual_length,
2024                                      &userurb->iso_frame_desc[i].actual_length))
2025                                 return -EFAULT;
2026                         if (put_user(urb->iso_frame_desc[i].status,
2027                                      &userurb->iso_frame_desc[i].status))
2028                                 return -EFAULT;
2029                 }
2030         }
2031
2032         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2033                 return -EFAULT;
2034         return 0;
2035 }
2036
2037 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2038 {
2039         struct async *as = reap_as(ps);
2040
2041         if (as) {
2042                 int retval;
2043
2044                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2045                 retval = processcompl_compat(as, (void __user * __user *)arg);
2046                 free_async(as);
2047                 return retval;
2048         }
2049         if (signal_pending(current))
2050                 return -EINTR;
2051         return -ENODEV;
2052 }
2053
2054 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2055 {
2056         int retval;
2057         struct async *as;
2058
2059         as = async_getcompleted(ps);
2060         if (as) {
2061                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2062                 retval = processcompl_compat(as, (void __user * __user *)arg);
2063                 free_async(as);
2064         } else {
2065                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2066         }
2067         return retval;
2068 }
2069
2070
2071 #endif
2072
2073 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2074 {
2075         struct usbdevfs_disconnectsignal ds;
2076
2077         if (copy_from_user(&ds, arg, sizeof(ds)))
2078                 return -EFAULT;
2079         ps->discsignr = ds.signr;
2080         ps->disccontext = ds.context;
2081         return 0;
2082 }
2083
2084 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2085 {
2086         unsigned int ifnum;
2087
2088         if (get_user(ifnum, (unsigned int __user *)arg))
2089                 return -EFAULT;
2090         return claimintf(ps, ifnum);
2091 }
2092
2093 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2094 {
2095         unsigned int ifnum;
2096         int ret;
2097
2098         if (get_user(ifnum, (unsigned int __user *)arg))
2099                 return -EFAULT;
2100         ret = releaseintf(ps, ifnum);
2101         if (ret < 0)
2102                 return ret;
2103         destroy_async_on_interface(ps, ifnum);
2104         return 0;
2105 }
2106
2107 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2108 {
2109         int                     size;
2110         void                    *buf = NULL;
2111         int                     retval = 0;
2112         struct usb_interface    *intf = NULL;
2113         struct usb_driver       *driver = NULL;
2114
2115         if (ps->privileges_dropped)
2116                 return -EACCES;
2117
2118         /* alloc buffer */
2119         size = _IOC_SIZE(ctl->ioctl_code);
2120         if (size > 0) {
2121                 buf = kmalloc(size, GFP_KERNEL);
2122                 if (buf == NULL)
2123                         return -ENOMEM;
2124                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2125                         if (copy_from_user(buf, ctl->data, size)) {
2126                                 kfree(buf);
2127                                 return -EFAULT;
2128                         }
2129                 } else {
2130                         memset(buf, 0, size);
2131                 }
2132         }
2133
2134         if (!connected(ps)) {
2135                 kfree(buf);
2136                 return -ENODEV;
2137         }
2138
2139         if (ps->dev->state != USB_STATE_CONFIGURED)
2140                 retval = -EHOSTUNREACH;
2141         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2142                 retval = -EINVAL;
2143         else switch (ctl->ioctl_code) {
2144
2145         /* disconnect kernel driver from interface */
2146         case USBDEVFS_DISCONNECT:
2147                 if (intf->dev.driver) {
2148                         driver = to_usb_driver(intf->dev.driver);
2149                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
2150                         usb_driver_release_interface(driver, intf);
2151                 } else
2152                         retval = -ENODATA;
2153                 break;
2154
2155         /* let kernel drivers try to (re)bind to the interface */
2156         case USBDEVFS_CONNECT:
2157                 if (!intf->dev.driver)
2158                         retval = device_attach(&intf->dev);
2159                 else
2160                         retval = -EBUSY;
2161                 break;
2162
2163         /* talk directly to the interface's driver */
2164         default:
2165                 if (intf->dev.driver)
2166                         driver = to_usb_driver(intf->dev.driver);
2167                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2168                         retval = -ENOTTY;
2169                 } else {
2170                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2171                         if (retval == -ENOIOCTLCMD)
2172                                 retval = -ENOTTY;
2173                 }
2174         }
2175
2176         /* cleanup and return */
2177         if (retval >= 0
2178                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2179                         && size > 0
2180                         && copy_to_user(ctl->data, buf, size) != 0)
2181                 retval = -EFAULT;
2182
2183         kfree(buf);
2184         return retval;
2185 }
2186
2187 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2188 {
2189         struct usbdevfs_ioctl   ctrl;
2190
2191         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2192                 return -EFAULT;
2193         return proc_ioctl(ps, &ctrl);
2194 }
2195
2196 #ifdef CONFIG_COMPAT
2197 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2198 {
2199         struct usbdevfs_ioctl32 ioc32;
2200         struct usbdevfs_ioctl ctrl;
2201
2202         if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2203                 return -EFAULT;
2204         ctrl.ifno = ioc32.ifno;
2205         ctrl.ioctl_code = ioc32.ioctl_code;
2206         ctrl.data = compat_ptr(ioc32.data);
2207         return proc_ioctl(ps, &ctrl);
2208 }
2209 #endif
2210
2211 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2212 {
2213         unsigned portnum;
2214         int rc;
2215
2216         if (get_user(portnum, (unsigned __user *) arg))
2217                 return -EFAULT;
2218         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2219         if (rc == 0)
2220                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2221                         portnum, task_pid_nr(current), current->comm);
2222         return rc;
2223 }
2224
2225 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2226 {
2227         unsigned portnum;
2228
2229         if (get_user(portnum, (unsigned __user *) arg))
2230                 return -EFAULT;
2231         return usb_hub_release_port(ps->dev, portnum, ps);
2232 }
2233
2234 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2235 {
2236         __u32 caps;
2237
2238         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2239                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2240                         USBDEVFS_CAP_DROP_PRIVILEGES;
2241         if (!ps->dev->bus->no_stop_on_short)
2242                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2243         if (ps->dev->bus->sg_tablesize)
2244                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2245
2246         if (put_user(caps, (__u32 __user *)arg))
2247                 return -EFAULT;
2248
2249         return 0;
2250 }
2251
2252 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2253 {
2254         struct usbdevfs_disconnect_claim dc;
2255         struct usb_interface *intf;
2256
2257         if (copy_from_user(&dc, arg, sizeof(dc)))
2258                 return -EFAULT;
2259
2260         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2261         if (!intf)
2262                 return -EINVAL;
2263
2264         if (intf->dev.driver) {
2265                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2266
2267                 if (ps->privileges_dropped)
2268                         return -EACCES;
2269
2270                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2271                                 strncmp(dc.driver, intf->dev.driver->name,
2272                                         sizeof(dc.driver)) != 0)
2273                         return -EBUSY;
2274
2275                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2276                                 strncmp(dc.driver, intf->dev.driver->name,
2277                                         sizeof(dc.driver)) == 0)
2278                         return -EBUSY;
2279
2280                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2281                 usb_driver_release_interface(driver, intf);
2282         }
2283
2284         return claimintf(ps, dc.interface);
2285 }
2286
2287 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2288 {
2289         unsigned num_streams, num_eps;
2290         struct usb_host_endpoint **eps;
2291         struct usb_interface *intf;
2292         int r;
2293
2294         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2295                                    &eps, &intf);
2296         if (r)
2297                 return r;
2298
2299         destroy_async_on_interface(ps,
2300                                    intf->altsetting[0].desc.bInterfaceNumber);
2301
2302         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2303         kfree(eps);
2304         return r;
2305 }
2306
2307 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2308 {
2309         unsigned num_eps;
2310         struct usb_host_endpoint **eps;
2311         struct usb_interface *intf;
2312         int r;
2313
2314         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2315         if (r)
2316                 return r;
2317
2318         destroy_async_on_interface(ps,
2319                                    intf->altsetting[0].desc.bInterfaceNumber);
2320
2321         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2322         kfree(eps);
2323         return r;
2324 }
2325
2326 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2327 {
2328         u32 data;
2329
2330         if (copy_from_user(&data, arg, sizeof(data)))
2331                 return -EFAULT;
2332
2333         /* This is a one way operation. Once privileges are
2334          * dropped, you cannot regain them. You may however reissue
2335          * this ioctl to shrink the allowed interfaces mask.
2336          */
2337         ps->interface_allowed_mask &= data;
2338         ps->privileges_dropped = true;
2339
2340         return 0;
2341 }
2342
2343 /*
2344  * NOTE:  All requests here that have interface numbers as parameters
2345  * are assuming that somehow the configuration has been prevented from
2346  * changing.  But there's no mechanism to ensure that...
2347  */
2348 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2349                                 void __user *p)
2350 {
2351         struct usb_dev_state *ps = file->private_data;
2352         struct inode *inode = file_inode(file);
2353         struct usb_device *dev = ps->dev;
2354         int ret = -ENOTTY;
2355
2356         if (!(file->f_mode & FMODE_WRITE))
2357                 return -EPERM;
2358
2359         usb_lock_device(dev);
2360
2361         /* Reap operations are allowed even after disconnection */
2362         switch (cmd) {
2363         case USBDEVFS_REAPURB:
2364                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2365                 ret = proc_reapurb(ps, p);
2366                 goto done;
2367
2368         case USBDEVFS_REAPURBNDELAY:
2369                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2370                 ret = proc_reapurbnonblock(ps, p);
2371                 goto done;
2372
2373 #ifdef CONFIG_COMPAT
2374         case USBDEVFS_REAPURB32:
2375                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2376                 ret = proc_reapurb_compat(ps, p);
2377                 goto done;
2378
2379         case USBDEVFS_REAPURBNDELAY32:
2380                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2381                 ret = proc_reapurbnonblock_compat(ps, p);
2382                 goto done;
2383 #endif
2384         }
2385
2386         if (!connected(ps)) {
2387                 usb_unlock_device(dev);
2388                 return -ENODEV;
2389         }
2390
2391         switch (cmd) {
2392         case USBDEVFS_CONTROL:
2393                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2394                 ret = proc_control(ps, p);
2395                 if (ret >= 0)
2396                         inode->i_mtime = current_time(inode);
2397                 break;
2398
2399         case USBDEVFS_BULK:
2400                 snoop(&dev->dev, "%s: BULK\n", __func__);
2401                 ret = proc_bulk(ps, p);
2402                 if (ret >= 0)
2403                         inode->i_mtime = current_time(inode);
2404                 break;
2405
2406         case USBDEVFS_RESETEP:
2407                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2408                 ret = proc_resetep(ps, p);
2409                 if (ret >= 0)
2410                         inode->i_mtime = current_time(inode);
2411                 break;
2412
2413         case USBDEVFS_RESET:
2414                 snoop(&dev->dev, "%s: RESET\n", __func__);
2415                 ret = proc_resetdevice(ps);
2416                 break;
2417
2418         case USBDEVFS_CLEAR_HALT:
2419                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2420                 ret = proc_clearhalt(ps, p);
2421                 if (ret >= 0)
2422                         inode->i_mtime = current_time(inode);
2423                 break;
2424
2425         case USBDEVFS_GETDRIVER:
2426                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2427                 ret = proc_getdriver(ps, p);
2428                 break;
2429
2430         case USBDEVFS_CONNECTINFO:
2431                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2432                 ret = proc_connectinfo(ps, p);
2433                 break;
2434
2435         case USBDEVFS_SETINTERFACE:
2436                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2437                 ret = proc_setintf(ps, p);
2438                 break;
2439
2440         case USBDEVFS_SETCONFIGURATION:
2441                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2442                 ret = proc_setconfig(ps, p);
2443                 break;
2444
2445         case USBDEVFS_SUBMITURB:
2446                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2447                 ret = proc_submiturb(ps, p);
2448                 if (ret >= 0)
2449                         inode->i_mtime = current_time(inode);
2450                 break;
2451
2452 #ifdef CONFIG_COMPAT
2453         case USBDEVFS_CONTROL32:
2454                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2455                 ret = proc_control_compat(ps, p);
2456                 if (ret >= 0)
2457                         inode->i_mtime = current_time(inode);
2458                 break;
2459
2460         case USBDEVFS_BULK32:
2461                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2462                 ret = proc_bulk_compat(ps, p);
2463                 if (ret >= 0)
2464                         inode->i_mtime = current_time(inode);
2465                 break;
2466
2467         case USBDEVFS_DISCSIGNAL32:
2468                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2469                 ret = proc_disconnectsignal_compat(ps, p);
2470                 break;
2471
2472         case USBDEVFS_SUBMITURB32:
2473                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2474                 ret = proc_submiturb_compat(ps, p);
2475                 if (ret >= 0)
2476                         inode->i_mtime = current_time(inode);
2477                 break;
2478
2479         case USBDEVFS_IOCTL32:
2480                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2481                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2482                 break;
2483 #endif
2484
2485         case USBDEVFS_DISCARDURB:
2486                 snoop(&dev->dev, "%s: DISCARDURB %pK\n", __func__, p);
2487                 ret = proc_unlinkurb(ps, p);
2488                 break;
2489
2490         case USBDEVFS_DISCSIGNAL:
2491                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2492                 ret = proc_disconnectsignal(ps, p);
2493                 break;
2494
2495         case USBDEVFS_CLAIMINTERFACE:
2496                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2497                 ret = proc_claiminterface(ps, p);
2498                 break;
2499
2500         case USBDEVFS_RELEASEINTERFACE:
2501                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2502                 ret = proc_releaseinterface(ps, p);
2503                 break;
2504
2505         case USBDEVFS_IOCTL:
2506                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2507                 ret = proc_ioctl_default(ps, p);
2508                 break;
2509
2510         case USBDEVFS_CLAIM_PORT:
2511                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2512                 ret = proc_claim_port(ps, p);
2513                 break;
2514
2515         case USBDEVFS_RELEASE_PORT:
2516                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2517                 ret = proc_release_port(ps, p);
2518                 break;
2519         case USBDEVFS_GET_CAPABILITIES:
2520                 ret = proc_get_capabilities(ps, p);
2521                 break;
2522         case USBDEVFS_DISCONNECT_CLAIM:
2523                 ret = proc_disconnect_claim(ps, p);
2524                 break;
2525         case USBDEVFS_ALLOC_STREAMS:
2526                 ret = proc_alloc_streams(ps, p);
2527                 break;
2528         case USBDEVFS_FREE_STREAMS:
2529                 ret = proc_free_streams(ps, p);
2530                 break;
2531         case USBDEVFS_DROP_PRIVILEGES:
2532                 ret = proc_drop_privileges(ps, p);
2533                 break;
2534         case USBDEVFS_GET_SPEED:
2535                 ret = ps->dev->speed;
2536                 break;
2537         }
2538
2539  done:
2540         usb_unlock_device(dev);
2541         if (ret >= 0)
2542                 inode->i_atime = current_time(inode);
2543         return ret;
2544 }
2545
2546 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2547                         unsigned long arg)
2548 {
2549         int ret;
2550
2551         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2552
2553         return ret;
2554 }
2555
2556 #ifdef CONFIG_COMPAT
2557 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2558                         unsigned long arg)
2559 {
2560         int ret;
2561
2562         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2563
2564         return ret;
2565 }
2566 #endif
2567
2568 /* No kernel lock - fine */
2569 static __poll_t usbdev_poll(struct file *file,
2570                                 struct poll_table_struct *wait)
2571 {
2572         struct usb_dev_state *ps = file->private_data;
2573         __poll_t mask = 0;
2574
2575         poll_wait(file, &ps->wait, wait);
2576         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2577                 mask |= EPOLLOUT | EPOLLWRNORM;
2578         if (!connected(ps))
2579                 mask |= EPOLLHUP;
2580         if (list_empty(&ps->list))
2581                 mask |= EPOLLERR;
2582         return mask;
2583 }
2584
2585 const struct file_operations usbdev_file_operations = {
2586         .owner =          THIS_MODULE,
2587         .llseek =         no_seek_end_llseek,
2588         .read =           usbdev_read,
2589         .poll =           usbdev_poll,
2590         .unlocked_ioctl = usbdev_ioctl,
2591 #ifdef CONFIG_COMPAT
2592         .compat_ioctl =   usbdev_compat_ioctl,
2593 #endif
2594         .mmap =           usbdev_mmap,
2595         .open =           usbdev_open,
2596         .release =        usbdev_release,
2597 };
2598
2599 static void usbdev_remove(struct usb_device *udev)
2600 {
2601         struct usb_dev_state *ps;
2602         struct siginfo sinfo;
2603
2604         while (!list_empty(&udev->filelist)) {
2605                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2606                 destroy_all_async(ps);
2607                 wake_up_all(&ps->wait);
2608                 list_del_init(&ps->list);
2609                 if (ps->discsignr) {
2610                         clear_siginfo(&sinfo);
2611                         sinfo.si_signo = ps->discsignr;
2612                         sinfo.si_errno = EPIPE;
2613                         sinfo.si_code = SI_ASYNCIO;
2614                         sinfo.si_addr = ps->disccontext;
2615                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2616                                         ps->disc_pid, ps->cred);
2617                 }
2618         }
2619 }
2620
2621 static int usbdev_notify(struct notifier_block *self,
2622                                unsigned long action, void *dev)
2623 {
2624         switch (action) {
2625         case USB_DEVICE_ADD:
2626                 break;
2627         case USB_DEVICE_REMOVE:
2628                 usbdev_remove(dev);
2629                 break;
2630         }
2631         return NOTIFY_OK;
2632 }
2633
2634 static struct notifier_block usbdev_nb = {
2635         .notifier_call =        usbdev_notify,
2636 };
2637
2638 static struct cdev usb_device_cdev;
2639
2640 int __init usb_devio_init(void)
2641 {
2642         int retval;
2643
2644         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2645                                         "usb_device");
2646         if (retval) {
2647                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2648                 goto out;
2649         }
2650         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2651         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2652         if (retval) {
2653                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2654                        USB_DEVICE_MAJOR);
2655                 goto error_cdev;
2656         }
2657         usb_register_notify(&usbdev_nb);
2658 out:
2659         return retval;
2660
2661 error_cdev:
2662         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2663         goto out;
2664 }
2665
2666 void usb_devio_cleanup(void)
2667 {
2668         usb_unregister_notify(&usbdev_nb);
2669         cdev_del(&usb_device_cdev);
2670         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2671 }