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 (sailer@ife.ee.ethz.ch)
   8  *
   9  *  This file implements the usbfs/x/y files, where
  10  *  x is the bus number and y the device number.
  11  *
  12  *  It allows user space programs/"drivers" to communicate directly
  13  *  with USB devices without intervening kernel driver.
  14  *
  15  *  Revision history
  16  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  17  *    04.01.2000   0.2   Turned into its own filesystem
  18  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  19  *                       (CAN-2005-3055)
  20  */
  21
  22 /*****************************************************************************/
  23
  24 #include <linux/fs.h>
  25 #include <linux/mm.h>
  26 #include <linux/sched/signal.h>
  27 #include <linux/slab.h>
  28 #include <linux/signal.h>
  29 #include <linux/poll.h>
  30 #include <linux/module.h>
  31 #include <linux/string.h>
  32 #include <linux/usb.h>
  33 #include <linux/usbdevice_fs.h>
  34 #include <linux/usb/hcd.h>      /* for usbcore internals */
  35 #include <linux/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 %px, ep%d %s-%s, "
 467                                         "length %u\n",
 468                                         userurb, ep, t, d, length);
 469                 else
 470                         dev_info(&udev->dev, "userurb %px, 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                 unsigned int old_suppress;
 744
 745                 /* suppress uevents while claiming interface */
 746                 old_suppress = dev_get_uevent_suppress(&intf->dev);
 747                 dev_set_uevent_suppress(&intf->dev, 1);
 748                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 749                 dev_set_uevent_suppress(&intf->dev, old_suppress);
 750         }
 751         if (err == 0)
 752                 set_bit(ifnum, &ps->ifclaimed);
 753         return err;
 754 }
 755
 756 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
 757 {
 758         struct usb_device *dev;
 759         struct usb_interface *intf;
 760         int err;
 761
 762         err = -EINVAL;
 763         if (ifnum >= 8*sizeof(ps->ifclaimed))
 764                 return err;
 765         dev = ps->dev;
 766         intf = usb_ifnum_to_if(dev, ifnum);
 767         if (!intf)
 768                 err = -ENOENT;
 769         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 770                 unsigned int old_suppress;
 771
 772                 /* suppress uevents while releasing interface */
 773                 old_suppress = dev_get_uevent_suppress(&intf->dev);
 774                 dev_set_uevent_suppress(&intf->dev, 1);
 775                 usb_driver_release_interface(&usbfs_driver, intf);
 776                 dev_set_uevent_suppress(&intf->dev, old_suppress);
 777                 err = 0;
 778         }
 779         return err;
 780 }
 781
 782 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
 783 {
 784         if (ps->dev->state != USB_STATE_CONFIGURED)
 785                 return -EHOSTUNREACH;
 786         if (ifnum >= 8*sizeof(ps->ifclaimed))
 787                 return -EINVAL;
 788         if (test_bit(ifnum, &ps->ifclaimed))
 789                 return 0;
 790         /* if not yet claimed, claim it for the driver */
 791         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 792                  "interface %u before use\n", task_pid_nr(current),
 793                  current->comm, ifnum);
 794         return claimintf(ps, ifnum);
 795 }
 796
 797 static int findintfep(struct usb_device *dev, unsigned int ep)
 798 {
 799         unsigned int i, j, e;
 800         struct usb_interface *intf;
 801         struct usb_host_interface *alts;
 802         struct usb_endpoint_descriptor *endpt;
 803
 804         if (ep & ~(USB_DIR_IN|0xf))
 805                 return -EINVAL;
 806         if (!dev->actconfig)
 807                 return -ESRCH;
 808         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 809                 intf = dev->actconfig->interface[i];
 810                 for (j = 0; j < intf->num_altsetting; j++) {
 811                         alts = &intf->altsetting[j];
 812                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 813                                 endpt = &alts->endpoint[e].desc;
 814                                 if (endpt->bEndpointAddress == ep)
 815                                         return alts->desc.bInterfaceNumber;
 816                         }
 817                 }
 818         }
 819         return -ENOENT;
 820 }
 821
 822 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
 823                            unsigned int request, unsigned int index)
 824 {
 825         int ret = 0;
 826         struct usb_host_interface *alt_setting;
 827
 828         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 829          && ps->dev->state != USB_STATE_ADDRESS
 830          && ps->dev->state != USB_STATE_CONFIGURED)
 831                 return -EHOSTUNREACH;
 832         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 833                 return 0;
 834
 835         /*
 836          * check for the special corner case 'get_device_id' in the printer
 837          * class specification, which we always want to allow as it is used
 838          * to query things like ink level, etc.
 839          */
 840         if (requesttype == 0xa1 && request == 0) {
 841                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 842                                                    index >> 8, index & 0xff);
 843                 if (alt_setting
 844                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 845                         return 0;
 846         }
 847
 848         index &= 0xff;
 849         switch (requesttype & USB_RECIP_MASK) {
 850         case USB_RECIP_ENDPOINT:
 851                 if ((index & ~USB_DIR_IN) == 0)
 852                         return 0;
 853                 ret = findintfep(ps->dev, index);
 854                 if (ret < 0) {
 855                         /*
 856                          * Some not fully compliant Win apps seem to get
 857                          * index wrong and have the endpoint number here
 858                          * rather than the endpoint address (with the
 859                          * correct direction). Win does let this through,
 860                          * so we'll not reject it here but leave it to
 861                          * the device to not break KVM. But we warn.
 862                          */
 863                         ret = findintfep(ps->dev, index ^ 0x80);
 864                         if (ret >= 0)
 865                                 dev_info(&ps->dev->dev,
 866                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 867                                         __func__, task_pid_nr(current),
 868                                         current->comm, index, index ^ 0x80);
 869                 }
 870                 if (ret >= 0)
 871                         ret = checkintf(ps, ret);
 872                 break;
 873
 874         case USB_RECIP_INTERFACE:
 875                 ret = checkintf(ps, index);
 876                 break;
 877         }
 878         return ret;
 879 }
 880
 881 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
 882                                                      unsigned char ep)
 883 {
 884         if (ep & USB_ENDPOINT_DIR_MASK)
 885                 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
 886         else
 887                 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
 888 }
 889
 890 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
 891                                   struct usbdevfs_streams __user *streams,
 892                                   unsigned int *num_streams_ret,
 893                                   unsigned int *num_eps_ret,
 894                                   struct usb_host_endpoint ***eps_ret,
 895                                   struct usb_interface **intf_ret)
 896 {
 897         unsigned int i, num_streams, num_eps;
 898         struct usb_host_endpoint **eps;
 899         struct usb_interface *intf = NULL;
 900         unsigned char ep;
 901         int ifnum, ret;
 902
 903         if (get_user(num_streams, &streams->num_streams) ||
 904             get_user(num_eps, &streams->num_eps))
 905                 return -EFAULT;
 906
 907         if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
 908                 return -EINVAL;
 909
 910         /* The XHCI controller allows max 2 ^ 16 streams */
 911         if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
 912                 return -EINVAL;
 913
 914         eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
 915         if (!eps)
 916                 return -ENOMEM;
 917
 918         for (i = 0; i < num_eps; i++) {
 919                 if (get_user(ep, &streams->eps[i])) {
 920                         ret = -EFAULT;
 921                         goto error;
 922                 }
 923                 eps[i] = ep_to_host_endpoint(ps->dev, ep);
 924                 if (!eps[i]) {
 925                         ret = -EINVAL;
 926                         goto error;
 927                 }
 928
 929                 /* usb_alloc/free_streams operate on an usb_interface */
 930                 ifnum = findintfep(ps->dev, ep);
 931                 if (ifnum < 0) {
 932                         ret = ifnum;
 933                         goto error;
 934                 }
 935
 936                 if (i == 0) {
 937                         ret = checkintf(ps, ifnum);
 938                         if (ret < 0)
 939                                 goto error;
 940                         intf = usb_ifnum_to_if(ps->dev, ifnum);
 941                 } else {
 942                         /* Verify all eps belong to the same interface */
 943                         if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
 944                                 ret = -EINVAL;
 945                                 goto error;
 946                         }
 947                 }
 948         }
 949
 950         if (num_streams_ret)
 951                 *num_streams_ret = num_streams;
 952         *num_eps_ret = num_eps;
 953         *eps_ret = eps;
 954         *intf_ret = intf;
 955
 956         return 0;
 957
 958 error:
 959         kfree(eps);
 960         return ret;
 961 }
 962
 963 static int match_devt(struct device *dev, void *data)
 964 {
 965         return dev->devt == (dev_t) (unsigned long) data;
 966 }
 967
 968 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 969 {
 970         struct device *dev;
 971
 972         dev = bus_find_device(&usb_bus_type, NULL,
 973                               (void *) (unsigned long) devt, match_devt);
 974         if (!dev)
 975                 return NULL;
 976         return to_usb_device(dev);
 977 }
 978
 979 /*
 980  * file operations
 981  */
 982 static int usbdev_open(struct inode *inode, struct file *file)
 983 {
 984         struct usb_device *dev = NULL;
 985         struct usb_dev_state *ps;
 986         int ret;
 987
 988         ret = -ENOMEM;
 989         ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
 990         if (!ps)
 991                 goto out_free_ps;
 992
 993         ret = -ENODEV;
 994
 995         /* Protect against simultaneous removal or release */
 996         mutex_lock(&usbfs_mutex);
 997
 998         /* usbdev device-node */
 999         if (imajor(inode) == USB_DEVICE_MAJOR)
1000                 dev = usbdev_lookup_by_devt(inode->i_rdev);
1001
1002         mutex_unlock(&usbfs_mutex);
1003
1004         if (!dev)
1005                 goto out_free_ps;
1006
1007         usb_lock_device(dev);
1008         if (dev->state == USB_STATE_NOTATTACHED)
1009                 goto out_unlock_device;
1010
1011         ret = usb_autoresume_device(dev);
1012         if (ret)
1013                 goto out_unlock_device;
1014
1015         ps->dev = dev;
1016         ps->file = file;
1017         ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1018         spin_lock_init(&ps->lock);
1019         INIT_LIST_HEAD(&ps->list);
1020         INIT_LIST_HEAD(&ps->async_pending);
1021         INIT_LIST_HEAD(&ps->async_completed);
1022         INIT_LIST_HEAD(&ps->memory_list);
1023         init_waitqueue_head(&ps->wait);
1024         ps->disc_pid = get_pid(task_pid(current));
1025         ps->cred = get_current_cred();
1026         smp_wmb();
1027         list_add_tail(&ps->list, &dev->filelist);
1028         file->private_data = ps;
1029         usb_unlock_device(dev);
1030         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1031                         current->comm);
1032         return ret;
1033
1034  out_unlock_device:
1035         usb_unlock_device(dev);
1036         usb_put_dev(dev);
1037  out_free_ps:
1038         kfree(ps);
1039         return ret;
1040 }
1041
1042 static int usbdev_release(struct inode *inode, struct file *file)
1043 {
1044         struct usb_dev_state *ps = file->private_data;
1045         struct usb_device *dev = ps->dev;
1046         unsigned int ifnum;
1047         struct async *as;
1048
1049         usb_lock_device(dev);
1050         usb_hub_release_all_ports(dev, ps);
1051
1052         list_del_init(&ps->list);
1053
1054         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1055                         ifnum++) {
1056                 if (test_bit(ifnum, &ps->ifclaimed))
1057                         releaseintf(ps, ifnum);
1058         }
1059         destroy_all_async(ps);
1060         usb_autosuspend_device(dev);
1061         usb_unlock_device(dev);
1062         usb_put_dev(dev);
1063         put_pid(ps->disc_pid);
1064         put_cred(ps->cred);
1065
1066         as = async_getcompleted(ps);
1067         while (as) {
1068                 free_async(as);
1069                 as = async_getcompleted(ps);
1070         }
1071
1072         kfree(ps);
1073         return 0;
1074 }
1075
1076 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1077 {
1078         struct usb_device *dev = ps->dev;
1079         struct usbdevfs_ctrltransfer ctrl;
1080         unsigned int tmo;
1081         unsigned char *tbuf;
1082         unsigned wLength;
1083         int i, pipe, ret;
1084
1085         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1086                 return -EFAULT;
1087         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1088                               ctrl.wIndex);
1089         if (ret)
1090                 return ret;
1091         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
1092         if (wLength > PAGE_SIZE)
1093                 return -EINVAL;
1094         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1095                         sizeof(struct usb_ctrlrequest));
1096         if (ret)
1097                 return ret;
1098         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1099         if (!tbuf) {
1100                 ret = -ENOMEM;
1101                 goto done;
1102         }
1103         tmo = ctrl.timeout;
1104         snoop(&dev->dev, "control urb: bRequestType=%02x "
1105                 "bRequest=%02x wValue=%04x "
1106                 "wIndex=%04x wLength=%04x\n",
1107                 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1108                 ctrl.wIndex, ctrl.wLength);
1109         if (ctrl.bRequestType & 0x80) {
1110                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1111                                                ctrl.wLength)) {
1112                         ret = -EINVAL;
1113                         goto done;
1114                 }
1115                 pipe = usb_rcvctrlpipe(dev, 0);
1116                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1117
1118                 usb_unlock_device(dev);
1119                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1120                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1121                                     tbuf, ctrl.wLength, tmo);
1122                 usb_lock_device(dev);
1123                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1124                           tbuf, max(i, 0));
1125                 if ((i > 0) && ctrl.wLength) {
1126                         if (copy_to_user(ctrl.data, tbuf, i)) {
1127                                 ret = -EFAULT;
1128                                 goto done;
1129                         }
1130                 }
1131         } else {
1132                 if (ctrl.wLength) {
1133                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1134                                 ret = -EFAULT;
1135                                 goto done;
1136                         }
1137                 }
1138                 pipe = usb_sndctrlpipe(dev, 0);
1139                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1140                         tbuf, ctrl.wLength);
1141
1142                 usb_unlock_device(dev);
1143                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1144                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1145                                     tbuf, ctrl.wLength, tmo);
1146                 usb_lock_device(dev);
1147                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1148         }
1149         if (i < 0 && i != -EPIPE) {
1150                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1151                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
1152                            current->comm, ctrl.bRequestType, ctrl.bRequest,
1153                            ctrl.wLength, i);
1154         }
1155         ret = i;
1156  done:
1157         free_page((unsigned long) tbuf);
1158         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1159                         sizeof(struct usb_ctrlrequest));
1160         return ret;
1161 }
1162
1163 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1164 {
1165         struct usb_device *dev = ps->dev;
1166         struct usbdevfs_bulktransfer bulk;
1167         unsigned int tmo, len1, pipe;
1168         int len2;
1169         unsigned char *tbuf;
1170         int i, ret;
1171
1172         if (copy_from_user(&bulk, arg, sizeof(bulk)))
1173                 return -EFAULT;
1174         ret = findintfep(ps->dev, bulk.ep);
1175         if (ret < 0)
1176                 return ret;
1177         ret = checkintf(ps, ret);
1178         if (ret)
1179                 return ret;
1180         if (bulk.ep & USB_DIR_IN)
1181                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1182         else
1183                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1184         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1185                 return -EINVAL;
1186         len1 = bulk.len;
1187         if (len1 >= (INT_MAX - sizeof(struct urb)))
1188                 return -EINVAL;
1189         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1190         if (ret)
1191                 return ret;
1192
1193         /*
1194          * len1 can be almost arbitrarily large.  Don't WARN if it's
1195          * too big, just fail the request.
1196          */
1197         tbuf = kmalloc(len1, GFP_KERNEL | __GFP_NOWARN);
1198         if (!tbuf) {
1199                 ret = -ENOMEM;
1200                 goto done;
1201         }
1202         tmo = bulk.timeout;
1203         if (bulk.ep & 0x80) {
1204                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1205                         ret = -EINVAL;
1206                         goto done;
1207                 }
1208                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1209
1210                 usb_unlock_device(dev);
1211                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1212                 usb_lock_device(dev);
1213                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1214
1215                 if (!i && len2) {
1216                         if (copy_to_user(bulk.data, tbuf, len2)) {
1217                                 ret = -EFAULT;
1218                                 goto done;
1219                         }
1220                 }
1221         } else {
1222                 if (len1) {
1223                         if (copy_from_user(tbuf, bulk.data, len1)) {
1224                                 ret = -EFAULT;
1225                                 goto done;
1226                         }
1227                 }
1228                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1229
1230                 usb_unlock_device(dev);
1231                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1232                 usb_lock_device(dev);
1233                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1234         }
1235         ret = (i < 0 ? i : len2);
1236  done:
1237         kfree(tbuf);
1238         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1239         return ret;
1240 }
1241
1242 static void check_reset_of_active_ep(struct usb_device *udev,
1243                 unsigned int epnum, char *ioctl_name)
1244 {
1245         struct usb_host_endpoint **eps;
1246         struct usb_host_endpoint *ep;
1247
1248         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1249         ep = eps[epnum & 0x0f];
1250         if (ep && !list_empty(&ep->urb_list))
1251                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1252                                 task_pid_nr(current), current->comm,
1253                                 ioctl_name, epnum);
1254 }
1255
1256 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1257 {
1258         unsigned int ep;
1259         int ret;
1260
1261         if (get_user(ep, (unsigned int __user *)arg))
1262                 return -EFAULT;
1263         ret = findintfep(ps->dev, ep);
1264         if (ret < 0)
1265                 return ret;
1266         ret = checkintf(ps, ret);
1267         if (ret)
1268                 return ret;
1269         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1270         usb_reset_endpoint(ps->dev, ep);
1271         return 0;
1272 }
1273
1274 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1275 {
1276         unsigned int ep;
1277         int pipe;
1278         int ret;
1279
1280         if (get_user(ep, (unsigned int __user *)arg))
1281                 return -EFAULT;
1282         ret = findintfep(ps->dev, ep);
1283         if (ret < 0)
1284                 return ret;
1285         ret = checkintf(ps, ret);
1286         if (ret)
1287                 return ret;
1288         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1289         if (ep & USB_DIR_IN)
1290                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1291         else
1292                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1293
1294         return usb_clear_halt(ps->dev, pipe);
1295 }
1296
1297 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1298 {
1299         struct usbdevfs_getdriver gd;
1300         struct usb_interface *intf;
1301         int ret;
1302
1303         if (copy_from_user(&gd, arg, sizeof(gd)))
1304                 return -EFAULT;
1305         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1306         if (!intf || !intf->dev.driver)
1307                 ret = -ENODATA;
1308         else {
1309                 strlcpy(gd.driver, intf->dev.driver->name,
1310                                 sizeof(gd.driver));
1311                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1312         }
1313         return ret;
1314 }
1315
1316 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1317 {
1318         struct usbdevfs_connectinfo ci;
1319
1320         memset(&ci, 0, sizeof(ci));
1321         ci.devnum = ps->dev->devnum;
1322         ci.slow = ps->dev->speed == USB_SPEED_LOW;
1323
1324         if (copy_to_user(arg, &ci, sizeof(ci)))
1325                 return -EFAULT;
1326         return 0;
1327 }
1328
1329 static int proc_resetdevice(struct usb_dev_state *ps)
1330 {
1331         struct usb_host_config *actconfig = ps->dev->actconfig;
1332         struct usb_interface *interface;
1333         int i, number;
1334
1335         /* Don't allow a device reset if the process has dropped the
1336          * privilege to do such things and any of the interfaces are
1337          * currently claimed.
1338          */
1339         if (ps->privileges_dropped && actconfig) {
1340                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1341                         interface = actconfig->interface[i];
1342                         number = interface->cur_altsetting->desc.bInterfaceNumber;
1343                         if (usb_interface_claimed(interface) &&
1344                                         !test_bit(number, &ps->ifclaimed)) {
1345                                 dev_warn(&ps->dev->dev,
1346                                         "usbfs: interface %d claimed by %s while '%s' resets device\n",
1347                                         number, interface->dev.driver->name, current->comm);
1348                                 return -EACCES;
1349                         }
1350                 }
1351         }
1352
1353         return usb_reset_device(ps->dev);
1354 }
1355
1356 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1357 {
1358         struct usbdevfs_setinterface setintf;
1359         int ret;
1360
1361         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1362                 return -EFAULT;
1363         ret = checkintf(ps, setintf.interface);
1364         if (ret)
1365                 return ret;
1366
1367         destroy_async_on_interface(ps, setintf.interface);
1368
1369         return usb_set_interface(ps->dev, setintf.interface,
1370                         setintf.altsetting);
1371 }
1372
1373 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1374 {
1375         int u;
1376         int status = 0;
1377         struct usb_host_config *actconfig;
1378
1379         if (get_user(u, (int __user *)arg))
1380                 return -EFAULT;
1381
1382         actconfig = ps->dev->actconfig;
1383
1384         /* Don't touch the device if any interfaces are claimed.
1385          * It could interfere with other drivers' operations, and if
1386          * an interface is claimed by usbfs it could easily deadlock.
1387          */
1388         if (actconfig) {
1389                 int i;
1390
1391                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1392                         if (usb_interface_claimed(actconfig->interface[i])) {
1393                                 dev_warn(&ps->dev->dev,
1394                                         "usbfs: interface %d claimed by %s "
1395                                         "while '%s' sets config #%d\n",
1396                                         actconfig->interface[i]
1397                                                 ->cur_altsetting
1398                                                 ->desc.bInterfaceNumber,
1399                                         actconfig->interface[i]
1400                                                 ->dev.driver->name,
1401                                         current->comm, u);
1402                                 status = -EBUSY;
1403                                 break;
1404                         }
1405                 }
1406         }
1407
1408         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1409          * so avoid usb_set_configuration()'s kick to sysfs
1410          */
1411         if (status == 0) {
1412                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1413                         status = usb_reset_configuration(ps->dev);
1414                 else
1415                         status = usb_set_configuration(ps->dev, u);
1416         }
1417
1418         return status;
1419 }
1420
1421 static struct usb_memory *
1422 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1423 {
1424         struct usb_memory *usbm = NULL, *iter;
1425         unsigned long flags;
1426         unsigned long uurb_start = (unsigned long)uurb->buffer;
1427
1428         spin_lock_irqsave(&ps->lock, flags);
1429         list_for_each_entry(iter, &ps->memory_list, memlist) {
1430                 if (uurb_start >= iter->vm_start &&
1431                                 uurb_start < iter->vm_start + iter->size) {
1432                         if (uurb->buffer_length > iter->vm_start + iter->size -
1433                                         uurb_start) {
1434                                 usbm = ERR_PTR(-EINVAL);
1435                         } else {
1436                                 usbm = iter;
1437                                 usbm->urb_use_count++;
1438                         }
1439                         break;
1440                 }
1441         }
1442         spin_unlock_irqrestore(&ps->lock, flags);
1443         return usbm;
1444 }
1445
1446 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1447                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1448                         void __user *arg)
1449 {
1450         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1451         struct usb_host_endpoint *ep;
1452         struct async *as = NULL;
1453         struct usb_ctrlrequest *dr = NULL;
1454         unsigned int u, totlen, isofrmlen;
1455         int i, ret, num_sgs = 0, ifnum = -1;
1456         int number_of_packets = 0;
1457         unsigned int stream_id = 0;
1458         void *buf;
1459         bool is_in;
1460         bool allow_short = false;
1461         bool allow_zero = false;
1462         unsigned long mask =    USBDEVFS_URB_SHORT_NOT_OK |
1463                                 USBDEVFS_URB_BULK_CONTINUATION |
1464                                 USBDEVFS_URB_NO_FSBR |
1465                                 USBDEVFS_URB_ZERO_PACKET |
1466                                 USBDEVFS_URB_NO_INTERRUPT;
1467         /* USBDEVFS_URB_ISO_ASAP is a special case */
1468         if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1469                 mask |= USBDEVFS_URB_ISO_ASAP;
1470
1471         if (uurb->flags & ~mask)
1472                         return -EINVAL;
1473
1474         if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1475                 return -EINVAL;
1476         if (uurb->buffer_length > 0 && !uurb->buffer)
1477                 return -EINVAL;
1478         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1479             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1480                 ifnum = findintfep(ps->dev, uurb->endpoint);
1481                 if (ifnum < 0)
1482                         return ifnum;
1483                 ret = checkintf(ps, ifnum);
1484                 if (ret)
1485                         return ret;
1486         }
1487         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1488         if (!ep)
1489                 return -ENOENT;
1490         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1491
1492         u = 0;
1493         switch (uurb->type) {
1494         case USBDEVFS_URB_TYPE_CONTROL:
1495                 if (!usb_endpoint_xfer_control(&ep->desc))
1496                         return -EINVAL;
1497                 /* min 8 byte setup packet */
1498                 if (uurb->buffer_length < 8)
1499                         return -EINVAL;
1500                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1501                 if (!dr)
1502                         return -ENOMEM;
1503                 if (copy_from_user(dr, uurb->buffer, 8)) {
1504                         ret = -EFAULT;
1505                         goto error;
1506                 }
1507                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1508                         ret = -EINVAL;
1509                         goto error;
1510                 }
1511                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1512                                       le16_to_cpup(&dr->wIndex));
1513                 if (ret)
1514                         goto error;
1515                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1516                 uurb->buffer += 8;
1517                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1518                         is_in = 1;
1519                         uurb->endpoint |= USB_DIR_IN;
1520                 } else {
1521                         is_in = 0;
1522                         uurb->endpoint &= ~USB_DIR_IN;
1523                 }
1524                 if (is_in)
1525                         allow_short = true;
1526                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1527                         "bRequest=%02x wValue=%04x "
1528                         "wIndex=%04x wLength=%04x\n",
1529                         dr->bRequestType, dr->bRequest,
1530                         __le16_to_cpup(&dr->wValue),
1531                         __le16_to_cpup(&dr->wIndex),
1532                         __le16_to_cpup(&dr->wLength));
1533                 u = sizeof(struct usb_ctrlrequest);
1534                 break;
1535
1536         case USBDEVFS_URB_TYPE_BULK:
1537                 if (!is_in)
1538                         allow_zero = true;
1539                 else
1540                         allow_short = true;
1541                 switch (usb_endpoint_type(&ep->desc)) {
1542                 case USB_ENDPOINT_XFER_CONTROL:
1543                 case USB_ENDPOINT_XFER_ISOC:
1544                         return -EINVAL;
1545                 case USB_ENDPOINT_XFER_INT:
1546                         /* allow single-shot interrupt transfers */
1547                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1548                         goto interrupt_urb;
1549                 }
1550                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1551                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1552                         num_sgs = 0;
1553                 if (ep->streams)
1554                         stream_id = uurb->stream_id;
1555                 break;
1556
1557         case USBDEVFS_URB_TYPE_INTERRUPT:
1558                 if (!usb_endpoint_xfer_int(&ep->desc))
1559                         return -EINVAL;
1560  interrupt_urb:
1561                 if (!is_in)
1562                         allow_zero = true;
1563                 else
1564                         allow_short = true;
1565                 break;
1566
1567         case USBDEVFS_URB_TYPE_ISO:
1568                 /* arbitrary limit */
1569                 if (uurb->number_of_packets < 1 ||
1570                     uurb->number_of_packets > 128)
1571                         return -EINVAL;
1572                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1573                         return -EINVAL;
1574                 number_of_packets = uurb->number_of_packets;
1575                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1576                                    number_of_packets;
1577                 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1578                 if (IS_ERR(isopkt)) {
1579                         ret = PTR_ERR(isopkt);
1580                         isopkt = NULL;
1581                         goto error;
1582                 }
1583                 for (totlen = u = 0; u < number_of_packets; u++) {
1584                         /*
1585                          * arbitrary limit need for USB 3.0
1586                          * bMaxBurst (0~15 allowed, 1~16 packets)
1587                          * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1588                          * sizemax: 1024 * 16 * 3 = 49152
1589                          */
1590                         if (isopkt[u].length > 49152) {
1591                                 ret = -EINVAL;
1592                                 goto error;
1593                         }
1594                         totlen += isopkt[u].length;
1595                 }
1596                 u *= sizeof(struct usb_iso_packet_descriptor);
1597                 uurb->buffer_length = totlen;
1598                 break;
1599
1600         default:
1601                 return -EINVAL;
1602         }
1603
1604         if (uurb->buffer_length > 0 &&
1605                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1606                                 uurb->buffer, uurb->buffer_length)) {
1607                 ret = -EFAULT;
1608                 goto error;
1609         }
1610         as = alloc_async(number_of_packets);
1611         if (!as) {
1612                 ret = -ENOMEM;
1613                 goto error;
1614         }
1615
1616         as->usbm = find_memory_area(ps, uurb);
1617         if (IS_ERR(as->usbm)) {
1618                 ret = PTR_ERR(as->usbm);
1619                 as->usbm = NULL;
1620                 goto error;
1621         }
1622
1623         /* do not use SG buffers when memory mapped segments
1624          * are in use
1625          */
1626         if (as->usbm)
1627                 num_sgs = 0;
1628
1629         u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1630              num_sgs * sizeof(struct scatterlist);
1631         ret = usbfs_increase_memory_usage(u);
1632         if (ret)
1633                 goto error;
1634         as->mem_usage = u;
1635
1636         if (num_sgs) {
1637                 as->urb->sg = kmalloc_array(num_sgs,
1638                                             sizeof(struct scatterlist),
1639                                             GFP_KERNEL | __GFP_NOWARN);
1640                 if (!as->urb->sg) {
1641                         ret = -ENOMEM;
1642                         goto error;
1643                 }
1644                 as->urb->num_sgs = num_sgs;
1645                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1646
1647                 totlen = uurb->buffer_length;
1648                 for (i = 0; i < as->urb->num_sgs; i++) {
1649                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1650                         buf = kmalloc(u, GFP_KERNEL);
1651                         if (!buf) {
1652                                 ret = -ENOMEM;
1653                                 goto error;
1654                         }
1655                         sg_set_buf(&as->urb->sg[i], buf, u);
1656
1657                         if (!is_in) {
1658                                 if (copy_from_user(buf, uurb->buffer, u)) {
1659                                         ret = -EFAULT;
1660                                         goto error;
1661                                 }
1662                                 uurb->buffer += u;
1663                         }
1664                         totlen -= u;
1665                 }
1666         } else if (uurb->buffer_length > 0) {
1667                 if (as->usbm) {
1668                         unsigned long uurb_start = (unsigned long)uurb->buffer;
1669
1670                         as->urb->transfer_buffer = as->usbm->mem +
1671                                         (uurb_start - as->usbm->vm_start);
1672                 } else {
1673                         as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1674                                         GFP_KERNEL | __GFP_NOWARN);
1675                         if (!as->urb->transfer_buffer) {
1676                                 ret = -ENOMEM;
1677                                 goto error;
1678                         }
1679                         if (!is_in) {
1680                                 if (copy_from_user(as->urb->transfer_buffer,
1681                                                    uurb->buffer,
1682                                                    uurb->buffer_length)) {
1683                                         ret = -EFAULT;
1684                                         goto error;
1685                                 }
1686                         } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1687                                 /*
1688                                  * Isochronous input data may end up being
1689                                  * discontiguous if some of the packets are
1690                                  * short. Clear the buffer so that the gaps
1691                                  * don't leak kernel data to userspace.
1692                                  */
1693                                 memset(as->urb->transfer_buffer, 0,
1694                                                 uurb->buffer_length);
1695                         }
1696                 }
1697         }
1698         as->urb->dev = ps->dev;
1699         as->urb->pipe = (uurb->type << 30) |
1700                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1701                         (uurb->endpoint & USB_DIR_IN);
1702
1703         /* This tedious sequence is necessary because the URB_* flags
1704          * are internal to the kernel and subject to change, whereas
1705          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1706          */
1707         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1708         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1709                 u |= URB_ISO_ASAP;
1710         if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1711                 u |= URB_SHORT_NOT_OK;
1712         if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1713                 u |= URB_ZERO_PACKET;
1714         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1715                 u |= URB_NO_INTERRUPT;
1716         as->urb->transfer_flags = u;
1717
1718         if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1719                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1720         if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1721                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1722
1723         as->urb->transfer_buffer_length = uurb->buffer_length;
1724         as->urb->setup_packet = (unsigned char *)dr;
1725         dr = NULL;
1726         as->urb->start_frame = uurb->start_frame;
1727         as->urb->number_of_packets = number_of_packets;
1728         as->urb->stream_id = stream_id;
1729
1730         if (ep->desc.bInterval) {
1731                 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1732                                 ps->dev->speed == USB_SPEED_HIGH ||
1733                                 ps->dev->speed >= USB_SPEED_SUPER)
1734                         as->urb->interval = 1 <<
1735                                         min(15, ep->desc.bInterval - 1);
1736                 else
1737                         as->urb->interval = ep->desc.bInterval;
1738         }
1739
1740         as->urb->context = as;
1741         as->urb->complete = async_completed;
1742         for (totlen = u = 0; u < number_of_packets; u++) {
1743                 as->urb->iso_frame_desc[u].offset = totlen;
1744                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1745                 totlen += isopkt[u].length;
1746         }
1747         kfree(isopkt);
1748         isopkt = NULL;
1749         as->ps = ps;
1750         as->userurb = arg;
1751         if (as->usbm) {
1752                 unsigned long uurb_start = (unsigned long)uurb->buffer;
1753
1754                 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1755                 as->urb->transfer_dma = as->usbm->dma_handle +
1756                                 (uurb_start - as->usbm->vm_start);
1757         } else if (is_in && uurb->buffer_length > 0)
1758                 as->userbuffer = uurb->buffer;
1759         as->signr = uurb->signr;
1760         as->ifnum = ifnum;
1761         as->pid = get_pid(task_pid(current));
1762         as->cred = get_current_cred();
1763         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1764                         as->urb->transfer_buffer_length, 0, SUBMIT,
1765                         NULL, 0);
1766         if (!is_in)
1767                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1768
1769         async_newpending(as);
1770
1771         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1772                 spin_lock_irq(&ps->lock);
1773
1774                 /* Not exactly the endpoint address; the direction bit is
1775                  * shifted to the 0x10 position so that the value will be
1776                  * between 0 and 31.
1777                  */
1778                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1779                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1780                                 >> 3);
1781
1782                 /* If this bulk URB is the start of a new transfer, re-enable
1783                  * the endpoint.  Otherwise mark it as a continuation URB.
1784                  */
1785                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1786                         as->bulk_status = AS_CONTINUATION;
1787                 else
1788                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1789
1790                 /* Don't accept continuation URBs if the endpoint is
1791                  * disabled because of an earlier error.
1792                  */
1793                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1794                         ret = -EREMOTEIO;
1795                 else
1796                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1797                 spin_unlock_irq(&ps->lock);
1798         } else {
1799                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1800         }
1801
1802         if (ret) {
1803                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1804                            "usbfs: usb_submit_urb returned %d\n", ret);
1805                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1806                                 0, ret, COMPLETE, NULL, 0);
1807                 async_removepending(as);
1808                 goto error;
1809         }
1810         return 0;
1811
1812  error:
1813         kfree(isopkt);
1814         kfree(dr);
1815         if (as)
1816                 free_async(as);
1817         return ret;
1818 }
1819
1820 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1821 {
1822         struct usbdevfs_urb uurb;
1823
1824         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1825                 return -EFAULT;
1826
1827         return proc_do_submiturb(ps, &uurb,
1828                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1829                         arg);
1830 }
1831
1832 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1833 {
1834         struct urb *urb;
1835         struct async *as;
1836         unsigned long flags;
1837
1838         spin_lock_irqsave(&ps->lock, flags);
1839         as = async_getpending(ps, arg);
1840         if (!as) {
1841                 spin_unlock_irqrestore(&ps->lock, flags);
1842                 return -EINVAL;
1843         }
1844
1845         urb = as->urb;
1846         usb_get_urb(urb);
1847         spin_unlock_irqrestore(&ps->lock, flags);
1848
1849         usb_kill_urb(urb);
1850         usb_put_urb(urb);
1851
1852         return 0;
1853 }
1854
1855 static void compute_isochronous_actual_length(struct urb *urb)
1856 {
1857         unsigned int i;
1858
1859         if (urb->number_of_packets > 0) {
1860                 urb->actual_length = 0;
1861                 for (i = 0; i < urb->number_of_packets; i++)
1862                         urb->actual_length +=
1863                                         urb->iso_frame_desc[i].actual_length;
1864         }
1865 }
1866
1867 static int processcompl(struct async *as, void __user * __user *arg)
1868 {
1869         struct urb *urb = as->urb;
1870         struct usbdevfs_urb __user *userurb = as->userurb;
1871         void __user *addr = as->userurb;
1872         unsigned int i;
1873
1874         compute_isochronous_actual_length(urb);
1875         if (as->userbuffer && urb->actual_length) {
1876                 if (copy_urb_data_to_user(as->userbuffer, urb))
1877                         goto err_out;
1878         }
1879         if (put_user(as->status, &userurb->status))
1880                 goto err_out;
1881         if (put_user(urb->actual_length, &userurb->actual_length))
1882                 goto err_out;
1883         if (put_user(urb->error_count, &userurb->error_count))
1884                 goto err_out;
1885
1886         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1887                 for (i = 0; i < urb->number_of_packets; i++) {
1888                         if (put_user(urb->iso_frame_desc[i].actual_length,
1889                                      &userurb->iso_frame_desc[i].actual_length))
1890                                 goto err_out;
1891                         if (put_user(urb->iso_frame_desc[i].status,
1892                                      &userurb->iso_frame_desc[i].status))
1893                                 goto err_out;
1894                 }
1895         }
1896
1897         if (put_user(addr, (void __user * __user *)arg))
1898                 return -EFAULT;
1899         return 0;
1900
1901 err_out:
1902         return -EFAULT;
1903 }
1904
1905 static struct async *reap_as(struct usb_dev_state *ps)
1906 {
1907         DECLARE_WAITQUEUE(wait, current);
1908         struct async *as = NULL;
1909         struct usb_device *dev = ps->dev;
1910
1911         add_wait_queue(&ps->wait, &wait);
1912         for (;;) {
1913                 __set_current_state(TASK_INTERRUPTIBLE);
1914                 as = async_getcompleted(ps);
1915                 if (as || !connected(ps))
1916                         break;
1917                 if (signal_pending(current))
1918                         break;
1919                 usb_unlock_device(dev);
1920                 schedule();
1921                 usb_lock_device(dev);
1922         }
1923         remove_wait_queue(&ps->wait, &wait);
1924         set_current_state(TASK_RUNNING);
1925         return as;
1926 }
1927
1928 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1929 {
1930         struct async *as = reap_as(ps);
1931
1932         if (as) {
1933                 int retval;
1934
1935                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
1936                 retval = processcompl(as, (void __user * __user *)arg);
1937                 free_async(as);
1938                 return retval;
1939         }
1940         if (signal_pending(current))
1941                 return -EINTR;
1942         return -ENODEV;
1943 }
1944
1945 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1946 {
1947         int retval;
1948         struct async *as;
1949
1950         as = async_getcompleted(ps);
1951         if (as) {
1952                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
1953                 retval = processcompl(as, (void __user * __user *)arg);
1954                 free_async(as);
1955         } else {
1956                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1957         }
1958         return retval;
1959 }
1960
1961 #ifdef CONFIG_COMPAT
1962 static int proc_control_compat(struct usb_dev_state *ps,
1963                                 struct usbdevfs_ctrltransfer32 __user *p32)
1964 {
1965         struct usbdevfs_ctrltransfer __user *p;
1966         __u32 udata;
1967         p = compat_alloc_user_space(sizeof(*p));
1968         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1969             get_user(udata, &p32->data) ||
1970             put_user(compat_ptr(udata), &p->data))
1971                 return -EFAULT;
1972         return proc_control(ps, p);
1973 }
1974
1975 static int proc_bulk_compat(struct usb_dev_state *ps,
1976                         struct usbdevfs_bulktransfer32 __user *p32)
1977 {
1978         struct usbdevfs_bulktransfer __user *p;
1979         compat_uint_t n;
1980         compat_caddr_t addr;
1981
1982         p = compat_alloc_user_space(sizeof(*p));
1983
1984         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1985             get_user(n, &p32->len) || put_user(n, &p->len) ||
1986             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1987             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1988                 return -EFAULT;
1989
1990         return proc_bulk(ps, p);
1991 }
1992 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1993 {
1994         struct usbdevfs_disconnectsignal32 ds;
1995
1996         if (copy_from_user(&ds, arg, sizeof(ds)))
1997                 return -EFAULT;
1998         ps->discsignr = ds.signr;
1999         ps->disccontext = compat_ptr(ds.context);
2000         return 0;
2001 }
2002
2003 static int get_urb32(struct usbdevfs_urb *kurb,
2004                      struct usbdevfs_urb32 __user *uurb)
2005 {
2006         struct usbdevfs_urb32 urb32;
2007         if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2008                 return -EFAULT;
2009         kurb->type = urb32.type;
2010         kurb->endpoint = urb32.endpoint;
2011         kurb->status = urb32.status;
2012         kurb->flags = urb32.flags;
2013         kurb->buffer = compat_ptr(urb32.buffer);
2014         kurb->buffer_length = urb32.buffer_length;
2015         kurb->actual_length = urb32.actual_length;
2016         kurb->start_frame = urb32.start_frame;
2017         kurb->number_of_packets = urb32.number_of_packets;
2018         kurb->error_count = urb32.error_count;
2019         kurb->signr = urb32.signr;
2020         kurb->usercontext = compat_ptr(urb32.usercontext);
2021         return 0;
2022 }
2023
2024 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2025 {
2026         struct usbdevfs_urb uurb;
2027
2028         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2029                 return -EFAULT;
2030
2031         return proc_do_submiturb(ps, &uurb,
2032                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2033                         arg);
2034 }
2035
2036 static int processcompl_compat(struct async *as, void __user * __user *arg)
2037 {
2038         struct urb *urb = as->urb;
2039         struct usbdevfs_urb32 __user *userurb = as->userurb;
2040         void __user *addr = as->userurb;
2041         unsigned int i;
2042
2043         compute_isochronous_actual_length(urb);
2044         if (as->userbuffer && urb->actual_length) {
2045                 if (copy_urb_data_to_user(as->userbuffer, urb))
2046                         return -EFAULT;
2047         }
2048         if (put_user(as->status, &userurb->status))
2049                 return -EFAULT;
2050         if (put_user(urb->actual_length, &userurb->actual_length))
2051                 return -EFAULT;
2052         if (put_user(urb->error_count, &userurb->error_count))
2053                 return -EFAULT;
2054
2055         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2056                 for (i = 0; i < urb->number_of_packets; i++) {
2057                         if (put_user(urb->iso_frame_desc[i].actual_length,
2058                                      &userurb->iso_frame_desc[i].actual_length))
2059                                 return -EFAULT;
2060                         if (put_user(urb->iso_frame_desc[i].status,
2061                                      &userurb->iso_frame_desc[i].status))
2062                                 return -EFAULT;
2063                 }
2064         }
2065
2066         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2067                 return -EFAULT;
2068         return 0;
2069 }
2070
2071 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2072 {
2073         struct async *as = reap_as(ps);
2074
2075         if (as) {
2076                 int retval;
2077
2078                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2079                 retval = processcompl_compat(as, (void __user * __user *)arg);
2080                 free_async(as);
2081                 return retval;
2082         }
2083         if (signal_pending(current))
2084                 return -EINTR;
2085         return -ENODEV;
2086 }
2087
2088 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2089 {
2090         int retval;
2091         struct async *as;
2092
2093         as = async_getcompleted(ps);
2094         if (as) {
2095                 snoop(&ps->dev->dev, "reap %px\n", as->userurb);
2096                 retval = processcompl_compat(as, (void __user * __user *)arg);
2097                 free_async(as);
2098         } else {
2099                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2100         }
2101         return retval;
2102 }
2103
2104
2105 #endif
2106
2107 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2108 {
2109         struct usbdevfs_disconnectsignal ds;
2110
2111         if (copy_from_user(&ds, arg, sizeof(ds)))
2112                 return -EFAULT;
2113         ps->discsignr = ds.signr;
2114         ps->disccontext = ds.context;
2115         return 0;
2116 }
2117
2118 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2119 {
2120         unsigned int ifnum;
2121
2122         if (get_user(ifnum, (unsigned int __user *)arg))
2123                 return -EFAULT;
2124         return claimintf(ps, ifnum);
2125 }
2126
2127 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2128 {
2129         unsigned int ifnum;
2130         int ret;
2131
2132         if (get_user(ifnum, (unsigned int __user *)arg))
2133                 return -EFAULT;
2134         ret = releaseintf(ps, ifnum);
2135         if (ret < 0)
2136                 return ret;
2137         destroy_async_on_interface(ps, ifnum);
2138         return 0;
2139 }
2140
2141 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2142 {
2143         int                     size;
2144         void                    *buf = NULL;
2145         int                     retval = 0;
2146         struct usb_interface    *intf = NULL;
2147         struct usb_driver       *driver = NULL;
2148
2149         if (ps->privileges_dropped)
2150                 return -EACCES;
2151
2152         /* alloc buffer */
2153         size = _IOC_SIZE(ctl->ioctl_code);
2154         if (size > 0) {
2155                 buf = kmalloc(size, GFP_KERNEL);
2156                 if (buf == NULL)
2157                         return -ENOMEM;
2158                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2159                         if (copy_from_user(buf, ctl->data, size)) {
2160                                 kfree(buf);
2161                                 return -EFAULT;
2162                         }
2163                 } else {
2164                         memset(buf, 0, size);
2165                 }
2166         }
2167
2168         if (!connected(ps)) {
2169                 kfree(buf);
2170                 return -ENODEV;
2171         }
2172
2173         if (ps->dev->state != USB_STATE_CONFIGURED)
2174                 retval = -EHOSTUNREACH;
2175         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2176                 retval = -EINVAL;
2177         else switch (ctl->ioctl_code) {
2178
2179         /* disconnect kernel driver from interface */
2180         case USBDEVFS_DISCONNECT:
2181                 if (intf->dev.driver) {
2182                         driver = to_usb_driver(intf->dev.driver);
2183                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
2184                         usb_driver_release_interface(driver, intf);
2185                 } else
2186                         retval = -ENODATA;
2187                 break;
2188
2189         /* let kernel drivers try to (re)bind to the interface */
2190         case USBDEVFS_CONNECT:
2191                 if (!intf->dev.driver)
2192                         retval = device_attach(&intf->dev);
2193                 else
2194                         retval = -EBUSY;
2195                 break;
2196
2197         /* talk directly to the interface's driver */
2198         default:
2199                 if (intf->dev.driver)
2200                         driver = to_usb_driver(intf->dev.driver);
2201                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2202                         retval = -ENOTTY;
2203                 } else {
2204                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2205                         if (retval == -ENOIOCTLCMD)
2206                                 retval = -ENOTTY;
2207                 }
2208         }
2209
2210         /* cleanup and return */
2211         if (retval >= 0
2212                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2213                         && size > 0
2214                         && copy_to_user(ctl->data, buf, size) != 0)
2215                 retval = -EFAULT;
2216
2217         kfree(buf);
2218         return retval;
2219 }
2220
2221 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2222 {
2223         struct usbdevfs_ioctl   ctrl;
2224
2225         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2226                 return -EFAULT;
2227         return proc_ioctl(ps, &ctrl);
2228 }
2229
2230 #ifdef CONFIG_COMPAT
2231 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2232 {
2233         struct usbdevfs_ioctl32 ioc32;
2234         struct usbdevfs_ioctl ctrl;
2235
2236         if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2237                 return -EFAULT;
2238         ctrl.ifno = ioc32.ifno;
2239         ctrl.ioctl_code = ioc32.ioctl_code;
2240         ctrl.data = compat_ptr(ioc32.data);
2241         return proc_ioctl(ps, &ctrl);
2242 }
2243 #endif
2244
2245 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2246 {
2247         unsigned portnum;
2248         int rc;
2249
2250         if (get_user(portnum, (unsigned __user *) arg))
2251                 return -EFAULT;
2252         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2253         if (rc == 0)
2254                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2255                         portnum, task_pid_nr(current), current->comm);
2256         return rc;
2257 }
2258
2259 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2260 {
2261         unsigned portnum;
2262
2263         if (get_user(portnum, (unsigned __user *) arg))
2264                 return -EFAULT;
2265         return usb_hub_release_port(ps->dev, portnum, ps);
2266 }
2267
2268 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2269 {
2270         __u32 caps;
2271
2272         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2273                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2274                         USBDEVFS_CAP_DROP_PRIVILEGES;
2275         if (!ps->dev->bus->no_stop_on_short)
2276                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2277         if (ps->dev->bus->sg_tablesize)
2278                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2279
2280         if (put_user(caps, (__u32 __user *)arg))
2281                 return -EFAULT;
2282
2283         return 0;
2284 }
2285
2286 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2287 {
2288         struct usbdevfs_disconnect_claim dc;
2289         struct usb_interface *intf;
2290
2291         if (copy_from_user(&dc, arg, sizeof(dc)))
2292                 return -EFAULT;
2293
2294         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2295         if (!intf)
2296                 return -EINVAL;
2297
2298         if (intf->dev.driver) {
2299                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2300
2301                 if (ps->privileges_dropped)
2302                         return -EACCES;
2303
2304                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2305                                 strncmp(dc.driver, intf->dev.driver->name,
2306                                         sizeof(dc.driver)) != 0)
2307                         return -EBUSY;
2308
2309                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2310                                 strncmp(dc.driver, intf->dev.driver->name,
2311                                         sizeof(dc.driver)) == 0)
2312                         return -EBUSY;
2313
2314                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2315                 usb_driver_release_interface(driver, intf);
2316         }
2317
2318         return claimintf(ps, dc.interface);
2319 }
2320
2321 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2322 {
2323         unsigned num_streams, num_eps;
2324         struct usb_host_endpoint **eps;
2325         struct usb_interface *intf;
2326         int r;
2327
2328         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2329                                    &eps, &intf);
2330         if (r)
2331                 return r;
2332
2333         destroy_async_on_interface(ps,
2334                                    intf->altsetting[0].desc.bInterfaceNumber);
2335
2336         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2337         kfree(eps);
2338         return r;
2339 }
2340
2341 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2342 {
2343         unsigned num_eps;
2344         struct usb_host_endpoint **eps;
2345         struct usb_interface *intf;
2346         int r;
2347
2348         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2349         if (r)
2350                 return r;
2351
2352         destroy_async_on_interface(ps,
2353                                    intf->altsetting[0].desc.bInterfaceNumber);
2354
2355         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2356         kfree(eps);
2357         return r;
2358 }
2359
2360 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2361 {
2362         u32 data;
2363
2364         if (copy_from_user(&data, arg, sizeof(data)))
2365                 return -EFAULT;
2366
2367         /* This is a one way operation. Once privileges are
2368          * dropped, you cannot regain them. You may however reissue
2369          * this ioctl to shrink the allowed interfaces mask.
2370          */
2371         ps->interface_allowed_mask &= data;
2372         ps->privileges_dropped = true;
2373
2374         return 0;
2375 }
2376
2377 /*
2378  * NOTE:  All requests here that have interface numbers as parameters
2379  * are assuming that somehow the configuration has been prevented from
2380  * changing.  But there's no mechanism to ensure that...
2381  */
2382 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2383                                 void __user *p)
2384 {
2385         struct usb_dev_state *ps = file->private_data;
2386         struct inode *inode = file_inode(file);
2387         struct usb_device *dev = ps->dev;
2388         int ret = -ENOTTY;
2389
2390         if (!(file->f_mode & FMODE_WRITE))
2391                 return -EPERM;
2392
2393         usb_lock_device(dev);
2394
2395         /* Reap operations are allowed even after disconnection */
2396         switch (cmd) {
2397         case USBDEVFS_REAPURB:
2398                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2399                 ret = proc_reapurb(ps, p);
2400                 goto done;
2401
2402         case USBDEVFS_REAPURBNDELAY:
2403                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2404                 ret = proc_reapurbnonblock(ps, p);
2405                 goto done;
2406
2407 #ifdef CONFIG_COMPAT
2408         case USBDEVFS_REAPURB32:
2409                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2410                 ret = proc_reapurb_compat(ps, p);
2411                 goto done;
2412
2413         case USBDEVFS_REAPURBNDELAY32:
2414                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2415                 ret = proc_reapurbnonblock_compat(ps, p);
2416                 goto done;
2417 #endif
2418         }
2419
2420         if (!connected(ps)) {
2421                 usb_unlock_device(dev);
2422                 return -ENODEV;
2423         }
2424
2425         switch (cmd) {
2426         case USBDEVFS_CONTROL:
2427                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2428                 ret = proc_control(ps, p);
2429                 if (ret >= 0)
2430                         inode->i_mtime = current_time(inode);
2431                 break;
2432
2433         case USBDEVFS_BULK:
2434                 snoop(&dev->dev, "%s: BULK\n", __func__);
2435                 ret = proc_bulk(ps, p);
2436                 if (ret >= 0)
2437                         inode->i_mtime = current_time(inode);
2438                 break;
2439
2440         case USBDEVFS_RESETEP:
2441                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2442                 ret = proc_resetep(ps, p);
2443                 if (ret >= 0)
2444                         inode->i_mtime = current_time(inode);
2445                 break;
2446
2447         case USBDEVFS_RESET:
2448                 snoop(&dev->dev, "%s: RESET\n", __func__);
2449                 ret = proc_resetdevice(ps);
2450                 break;
2451
2452         case USBDEVFS_CLEAR_HALT:
2453                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2454                 ret = proc_clearhalt(ps, p);
2455                 if (ret >= 0)
2456                         inode->i_mtime = current_time(inode);
2457                 break;
2458
2459         case USBDEVFS_GETDRIVER:
2460                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2461                 ret = proc_getdriver(ps, p);
2462                 break;
2463
2464         case USBDEVFS_CONNECTINFO:
2465                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2466                 ret = proc_connectinfo(ps, p);
2467                 break;
2468
2469         case USBDEVFS_SETINTERFACE:
2470                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2471                 ret = proc_setintf(ps, p);
2472                 break;
2473
2474         case USBDEVFS_SETCONFIGURATION:
2475                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2476                 ret = proc_setconfig(ps, p);
2477                 break;
2478
2479         case USBDEVFS_SUBMITURB:
2480                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2481                 ret = proc_submiturb(ps, p);
2482                 if (ret >= 0)
2483                         inode->i_mtime = current_time(inode);
2484                 break;
2485
2486 #ifdef CONFIG_COMPAT
2487         case USBDEVFS_CONTROL32:
2488                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2489                 ret = proc_control_compat(ps, p);
2490                 if (ret >= 0)
2491                         inode->i_mtime = current_time(inode);
2492                 break;
2493
2494         case USBDEVFS_BULK32:
2495                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2496                 ret = proc_bulk_compat(ps, p);
2497                 if (ret >= 0)
2498                         inode->i_mtime = current_time(inode);
2499                 break;
2500
2501         case USBDEVFS_DISCSIGNAL32:
2502                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2503                 ret = proc_disconnectsignal_compat(ps, p);
2504                 break;
2505
2506         case USBDEVFS_SUBMITURB32:
2507                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2508                 ret = proc_submiturb_compat(ps, p);
2509                 if (ret >= 0)
2510                         inode->i_mtime = current_time(inode);
2511                 break;
2512
2513         case USBDEVFS_IOCTL32:
2514                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2515                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2516                 break;
2517 #endif
2518
2519         case USBDEVFS_DISCARDURB:
2520                 snoop(&dev->dev, "%s: DISCARDURB %px\n", __func__, p);
2521                 ret = proc_unlinkurb(ps, p);
2522                 break;
2523
2524         case USBDEVFS_DISCSIGNAL:
2525                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2526                 ret = proc_disconnectsignal(ps, p);
2527                 break;
2528
2529         case USBDEVFS_CLAIMINTERFACE:
2530                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2531                 ret = proc_claiminterface(ps, p);
2532                 break;
2533
2534         case USBDEVFS_RELEASEINTERFACE:
2535                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2536                 ret = proc_releaseinterface(ps, p);
2537                 break;
2538
2539         case USBDEVFS_IOCTL:
2540                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2541                 ret = proc_ioctl_default(ps, p);
2542                 break;
2543
2544         case USBDEVFS_CLAIM_PORT:
2545                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2546                 ret = proc_claim_port(ps, p);
2547                 break;
2548
2549         case USBDEVFS_RELEASE_PORT:
2550                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2551                 ret = proc_release_port(ps, p);
2552                 break;
2553         case USBDEVFS_GET_CAPABILITIES:
2554                 ret = proc_get_capabilities(ps, p);
2555                 break;
2556         case USBDEVFS_DISCONNECT_CLAIM:
2557                 ret = proc_disconnect_claim(ps, p);
2558                 break;
2559         case USBDEVFS_ALLOC_STREAMS:
2560                 ret = proc_alloc_streams(ps, p);
2561                 break;
2562         case USBDEVFS_FREE_STREAMS:
2563                 ret = proc_free_streams(ps, p);
2564                 break;
2565         case USBDEVFS_DROP_PRIVILEGES:
2566                 ret = proc_drop_privileges(ps, p);
2567                 break;
2568         case USBDEVFS_GET_SPEED:
2569                 ret = ps->dev->speed;
2570                 break;
2571         }
2572
2573  done:
2574         usb_unlock_device(dev);
2575         if (ret >= 0)
2576                 inode->i_atime = current_time(inode);
2577         return ret;
2578 }
2579
2580 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2581                         unsigned long arg)
2582 {
2583         int ret;
2584
2585         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2586
2587         return ret;
2588 }
2589
2590 #ifdef CONFIG_COMPAT
2591 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2592                         unsigned long arg)
2593 {
2594         int ret;
2595
2596         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2597
2598         return ret;
2599 }
2600 #endif
2601
2602 /* No kernel lock - fine */
2603 static __poll_t usbdev_poll(struct file *file,
2604                                 struct poll_table_struct *wait)
2605 {
2606         struct usb_dev_state *ps = file->private_data;
2607         __poll_t mask = 0;
2608
2609         poll_wait(file, &ps->wait, wait);
2610         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2611                 mask |= EPOLLOUT | EPOLLWRNORM;
2612         if (!connected(ps))
2613                 mask |= EPOLLHUP;
2614         if (list_empty(&ps->list))
2615                 mask |= EPOLLERR;
2616         return mask;
2617 }
2618
2619 const struct file_operations usbdev_file_operations = {
2620         .owner =          THIS_MODULE,
2621         .llseek =         no_seek_end_llseek,
2622         .read =           usbdev_read,
2623         .poll =           usbdev_poll,
2624         .unlocked_ioctl = usbdev_ioctl,
2625 #ifdef CONFIG_COMPAT
2626         .compat_ioctl =   usbdev_compat_ioctl,
2627 #endif
2628         .mmap =           usbdev_mmap,
2629         .open =           usbdev_open,
2630         .release =        usbdev_release,
2631 };
2632
2633 static void usbdev_remove(struct usb_device *udev)
2634 {
2635         struct usb_dev_state *ps;
2636         struct siginfo sinfo;
2637
2638         while (!list_empty(&udev->filelist)) {
2639                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2640                 destroy_all_async(ps);
2641                 wake_up_all(&ps->wait);
2642                 list_del_init(&ps->list);
2643                 if (ps->discsignr) {
2644                         clear_siginfo(&sinfo);
2645                         sinfo.si_signo = ps->discsignr;
2646                         sinfo.si_errno = EPIPE;
2647                         sinfo.si_code = SI_ASYNCIO;
2648                         sinfo.si_addr = ps->disccontext;
2649                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2650                                         ps->disc_pid, ps->cred);
2651                 }
2652         }
2653 }
2654
2655 static int usbdev_notify(struct notifier_block *self,
2656                                unsigned long action, void *dev)
2657 {
2658         switch (action) {
2659         case USB_DEVICE_ADD:
2660                 break;
2661         case USB_DEVICE_REMOVE:
2662                 usbdev_remove(dev);
2663                 break;
2664         }
2665         return NOTIFY_OK;
2666 }
2667
2668 static struct notifier_block usbdev_nb = {
2669         .notifier_call =        usbdev_notify,
2670 };
2671
2672 static struct cdev usb_device_cdev;
2673
2674 int __init usb_devio_init(void)
2675 {
2676         int retval;
2677
2678         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2679                                         "usb_device");
2680         if (retval) {
2681                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2682                 goto out;
2683         }
2684         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2685         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2686         if (retval) {
2687                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2688                        USB_DEVICE_MAJOR);
2689                 goto error_cdev;
2690         }
2691         usb_register_notify(&usbdev_nb);
2692 out:
2693         return retval;
2694
2695 error_cdev:
2696         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2697         goto out;
2698 }
2699
2700 void usb_devio_cleanup(void)
2701 {
2702         usb_unregister_notify(&usbdev_nb);
2703         cdev_del(&usb_device_cdev);
2704         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2705 }