drivers/usb/core/devio.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  This file implements the usbfs/x/y files, where
  23  *  x is the bus number and y the device number.
  24  *
  25  *  It allows user space programs/"drivers" to communicate directly
  26  *  with USB devices without intervening kernel driver.
  27  *
  28  *  Revision history
  29  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  30  *    04.01.2000   0.2   Turned into its own filesystem
  31  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  32  *                       (CAN-2005-3055)
  33  */
  34
  35 /*****************************************************************************/
  36
  37 #include <linux/fs.h>
  38 #include <linux/mm.h>
  39 #include <linux/slab.h>
  40 #include <linux/signal.h>
  41 #include <linux/poll.h>
  42 #include <linux/module.h>
  43 #include <linux/usb.h>
  44 #include <linux/usbdevice_fs.h>
  45 #include <linux/usb/hcd.h>      /* for usbcore internals */
  46 #include <linux/cdev.h>
  47 #include <linux/notifier.h>
  48 #include <linux/security.h>
  49 #include <linux/user_namespace.h>
  50 #include <linux/scatterlist.h>
  51 #include <asm/uaccess.h>
  52 #include <asm/byteorder.h>
  53 #include <linux/moduleparam.h>
  54
  55 #include "usb.h"
  56
  57 #define USB_MAXBUS                      64
  58 #define USB_DEVICE_MAX                  USB_MAXBUS * 128
  59 #define USB_SG_SIZE                     16384 /* split-size for large txs */
  60
  61 /* Mutual exclusion for removal, open, and release */
  62 DEFINE_MUTEX(usbfs_mutex);
  63
  64 struct dev_state {
  65         struct list_head list;      /* state list */
  66         struct usb_device *dev;
  67         struct file *file;
  68         spinlock_t lock;            /* protects the async urb lists */
  69         struct list_head async_pending;
  70         struct list_head async_completed;
  71         wait_queue_head_t wait;     /* wake up if a request completed */
  72         unsigned int discsignr;
  73         struct pid *disc_pid;
  74         const struct cred *cred;
  75         void __user *disccontext;
  76         unsigned long ifclaimed;
  77         u32 secid;
  78         u32 disabled_bulk_eps;
  79 };
  80
  81 struct async {
  82         struct list_head asynclist;
  83         struct dev_state *ps;
  84         struct pid *pid;
  85         const struct cred *cred;
  86         unsigned int signr;
  87         unsigned int ifnum;
  88         void __user *userbuffer;
  89         void __user *userurb;
  90         struct urb *urb;
  91         unsigned int mem_usage;
  92         int status;
  93         u32 secid;
  94         u8 bulk_addr;
  95         u8 bulk_status;
  96 };
  97
  98 static bool usbfs_snoop;
  99 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
 100 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
 101
 102 #define snoop(dev, format, arg...)                              \
 103         do {                                                    \
 104                 if (usbfs_snoop)                                \
 105                         dev_info(dev , format , ## arg);        \
 106         } while (0)
 107
 108 enum snoop_when {
 109         SUBMIT, COMPLETE
 110 };
 111
 112 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 113
 114 /* Limit on the total amount of memory we can allocate for transfers */
 115 static unsigned usbfs_memory_mb = 16;
 116 module_param(usbfs_memory_mb, uint, 0644);
 117 MODULE_PARM_DESC(usbfs_memory_mb,
 118                 "maximum MB allowed for usbfs buffers (0 = no limit)");
 119
 120 /* Hard limit, necessary to avoid aithmetic overflow */
 121 #define USBFS_XFER_MAX          (UINT_MAX / 2 - 1000000)
 122
 123 static atomic_t usbfs_memory_usage;     /* Total memory currently allocated */
 124
 125 /* Check whether it's okay to allocate more memory for a transfer */
 126 static int usbfs_increase_memory_usage(unsigned amount)
 127 {
 128         unsigned lim;
 129
 130         /*
 131          * Convert usbfs_memory_mb to bytes, avoiding overflows.
 132          * 0 means use the hard limit (effectively unlimited).
 133          */
 134         lim = ACCESS_ONCE(usbfs_memory_mb);
 135         if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
 136                 lim = USBFS_XFER_MAX;
 137         else
 138                 lim <<= 20;
 139
 140         atomic_add(amount, &usbfs_memory_usage);
 141         if (atomic_read(&usbfs_memory_usage) <= lim)
 142                 return 0;
 143         atomic_sub(amount, &usbfs_memory_usage);
 144         return -ENOMEM;
 145 }
 146
 147 /* Memory for a transfer is being deallocated */
 148 static void usbfs_decrease_memory_usage(unsigned amount)
 149 {
 150         atomic_sub(amount, &usbfs_memory_usage);
 151 }
 152
 153 static int connected(struct dev_state *ps)
 154 {
 155         return (!list_empty(&ps->list) &&
 156                         ps->dev->state != USB_STATE_NOTATTACHED);
 157 }
 158
 159 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 160 {
 161         loff_t ret;
 162
 163         mutex_lock(&file->f_dentry->d_inode->i_mutex);
 164
 165         switch (orig) {
 166         case 0:
 167                 file->f_pos = offset;
 168                 ret = file->f_pos;
 169                 break;
 170         case 1:
 171                 file->f_pos += offset;
 172                 ret = file->f_pos;
 173                 break;
 174         case 2:
 175         default:
 176                 ret = -EINVAL;
 177         }
 178
 179         mutex_unlock(&file->f_dentry->d_inode->i_mutex);
 180         return ret;
 181 }
 182
 183 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 184                            loff_t *ppos)
 185 {
 186         struct dev_state *ps = file->private_data;
 187         struct usb_device *dev = ps->dev;
 188         ssize_t ret = 0;
 189         unsigned len;
 190         loff_t pos;
 191         int i;
 192
 193         pos = *ppos;
 194         usb_lock_device(dev);
 195         if (!connected(ps)) {
 196                 ret = -ENODEV;
 197                 goto err;
 198         } else if (pos < 0) {
 199                 ret = -EINVAL;
 200                 goto err;
 201         }
 202
 203         if (pos < sizeof(struct usb_device_descriptor)) {
 204                 /* 18 bytes - fits on the stack */
 205                 struct usb_device_descriptor temp_desc;
 206
 207                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 208                 le16_to_cpus(&temp_desc.bcdUSB);
 209                 le16_to_cpus(&temp_desc.idVendor);
 210                 le16_to_cpus(&temp_desc.idProduct);
 211                 le16_to_cpus(&temp_desc.bcdDevice);
 212
 213                 len = sizeof(struct usb_device_descriptor) - pos;
 214                 if (len > nbytes)
 215                         len = nbytes;
 216                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 217                         ret = -EFAULT;
 218                         goto err;
 219                 }
 220
 221                 *ppos += len;
 222                 buf += len;
 223                 nbytes -= len;
 224                 ret += len;
 225         }
 226
 227         pos = sizeof(struct usb_device_descriptor);
 228         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 229                 struct usb_config_descriptor *config =
 230                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 231                 unsigned int length = le16_to_cpu(config->wTotalLength);
 232
 233                 if (*ppos < pos + length) {
 234
 235                         /* The descriptor may claim to be longer than it
 236                          * really is.  Here is the actual allocated length. */
 237                         unsigned alloclen =
 238                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 239
 240                         len = length - (*ppos - pos);
 241                         if (len > nbytes)
 242                                 len = nbytes;
 243
 244                         /* Simply don't write (skip over) unallocated parts */
 245                         if (alloclen > (*ppos - pos)) {
 246                                 alloclen -= (*ppos - pos);
 247                                 if (copy_to_user(buf,
 248                                     dev->rawdescriptors[i] + (*ppos - pos),
 249                                     min(len, alloclen))) {
 250                                         ret = -EFAULT;
 251                                         goto err;
 252                                 }
 253                         }
 254
 255                         *ppos += len;
 256                         buf += len;
 257                         nbytes -= len;
 258                         ret += len;
 259                 }
 260
 261                 pos += length;
 262         }
 263
 264 err:
 265         usb_unlock_device(dev);
 266         return ret;
 267 }
 268
 269 /*
 270  * async list handling
 271  */
 272
 273 static struct async *alloc_async(unsigned int numisoframes)
 274 {
 275         struct async *as;
 276
 277         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 278         if (!as)
 279                 return NULL;
 280         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 281         if (!as->urb) {
 282                 kfree(as);
 283                 return NULL;
 284         }
 285         return as;
 286 }
 287
 288 static void free_async(struct async *as)
 289 {
 290         int i;
 291
 292         put_pid(as->pid);
 293         if (as->cred)
 294                 put_cred(as->cred);
 295         for (i = 0; i < as->urb->num_sgs; i++) {
 296                 if (sg_page(&as->urb->sg[i]))
 297                         kfree(sg_virt(&as->urb->sg[i]));
 298         }
 299         kfree(as->urb->sg);
 300         kfree(as->urb->transfer_buffer);
 301         kfree(as->urb->setup_packet);
 302         usb_free_urb(as->urb);
 303         usbfs_decrease_memory_usage(as->mem_usage);
 304         kfree(as);
 305 }
 306
 307 static void async_newpending(struct async *as)
 308 {
 309         struct dev_state *ps = as->ps;
 310         unsigned long flags;
 311
 312         spin_lock_irqsave(&ps->lock, flags);
 313         list_add_tail(&as->asynclist, &ps->async_pending);
 314         spin_unlock_irqrestore(&ps->lock, flags);
 315 }
 316
 317 static void async_removepending(struct async *as)
 318 {
 319         struct dev_state *ps = as->ps;
 320         unsigned long flags;
 321
 322         spin_lock_irqsave(&ps->lock, flags);
 323         list_del_init(&as->asynclist);
 324         spin_unlock_irqrestore(&ps->lock, flags);
 325 }
 326
 327 static struct async *async_getcompleted(struct dev_state *ps)
 328 {
 329         unsigned long flags;
 330         struct async *as = NULL;
 331
 332         spin_lock_irqsave(&ps->lock, flags);
 333         if (!list_empty(&ps->async_completed)) {
 334                 as = list_entry(ps->async_completed.next, struct async,
 335                                 asynclist);
 336                 list_del_init(&as->asynclist);
 337         }
 338         spin_unlock_irqrestore(&ps->lock, flags);
 339         return as;
 340 }
 341
 342 static struct async *async_getpending(struct dev_state *ps,
 343                                              void __user *userurb)
 344 {
 345         struct async *as;
 346
 347         list_for_each_entry(as, &ps->async_pending, asynclist)
 348                 if (as->userurb == userurb) {
 349                         list_del_init(&as->asynclist);
 350                         return as;
 351                 }
 352
 353         return NULL;
 354 }
 355
 356 static void snoop_urb(struct usb_device *udev,
 357                 void __user *userurb, int pipe, unsigned length,
 358                 int timeout_or_status, enum snoop_when when,
 359                 unsigned char *data, unsigned data_len)
 360 {
 361         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 362         static const char *dirs[] = {"out", "in"};
 363         int ep;
 364         const char *t, *d;
 365
 366         if (!usbfs_snoop)
 367                 return;
 368
 369         ep = usb_pipeendpoint(pipe);
 370         t = types[usb_pipetype(pipe)];
 371         d = dirs[!!usb_pipein(pipe)];
 372
 373         if (userurb) {          /* Async */
 374                 if (when == SUBMIT)
 375                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 376                                         "length %u\n",
 377                                         userurb, ep, t, d, length);
 378                 else
 379                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 380                                         "actual_length %u status %d\n",
 381                                         userurb, ep, t, d, length,
 382                                         timeout_or_status);
 383         } else {
 384                 if (when == SUBMIT)
 385                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 386                                         "timeout %d\n",
 387                                         ep, t, d, length, timeout_or_status);
 388                 else
 389                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 390                                         "status %d\n",
 391                                         ep, t, d, length, timeout_or_status);
 392         }
 393
 394         if (data && data_len > 0) {
 395                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 396                         data, data_len, 1);
 397         }
 398 }
 399
 400 static void snoop_urb_data(struct urb *urb, unsigned len)
 401 {
 402         int i, size;
 403
 404         if (!usbfs_snoop)
 405                 return;
 406
 407         if (urb->num_sgs == 0) {
 408                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 409                         urb->transfer_buffer, len, 1);
 410                 return;
 411         }
 412
 413         for (i = 0; i < urb->num_sgs && len; i++) {
 414                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 415                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 416                         sg_virt(&urb->sg[i]), size, 1);
 417                 len -= size;
 418         }
 419 }
 420
 421 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
 422 {
 423         unsigned i, len, size;
 424
 425         if (urb->number_of_packets > 0)         /* Isochronous */
 426                 len = urb->transfer_buffer_length;
 427         else                                    /* Non-Isoc */
 428                 len = urb->actual_length;
 429
 430         if (urb->num_sgs == 0) {
 431                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
 432                         return -EFAULT;
 433                 return 0;
 434         }
 435
 436         for (i = 0; i < urb->num_sgs && len; i++) {
 437                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 438                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
 439                         return -EFAULT;
 440                 userbuffer += size;
 441                 len -= size;
 442         }
 443
 444         return 0;
 445 }
 446
 447 #define AS_CONTINUATION 1
 448 #define AS_UNLINK       2
 449
 450 static void cancel_bulk_urbs(struct dev_state *ps, unsigned bulk_addr)
 451 __releases(ps->lock)
 452 __acquires(ps->lock)
 453 {
 454         struct urb *urb;
 455         struct async *as;
 456
 457         /* Mark all the pending URBs that match bulk_addr, up to but not
 458          * including the first one without AS_CONTINUATION.  If such an
 459          * URB is encountered then a new transfer has already started so
 460          * the endpoint doesn't need to be disabled; otherwise it does.
 461          */
 462         list_for_each_entry(as, &ps->async_pending, asynclist) {
 463                 if (as->bulk_addr == bulk_addr) {
 464                         if (as->bulk_status != AS_CONTINUATION)
 465                                 goto rescan;
 466                         as->bulk_status = AS_UNLINK;
 467                         as->bulk_addr = 0;
 468                 }
 469         }
 470         ps->disabled_bulk_eps |= (1 << bulk_addr);
 471
 472         /* Now carefully unlink all the marked pending URBs */
 473  rescan:
 474         list_for_each_entry(as, &ps->async_pending, asynclist) {
 475                 if (as->bulk_status == AS_UNLINK) {
 476                         as->bulk_status = 0;            /* Only once */
 477                         urb = as->urb;
 478                         usb_get_urb(urb);
 479                         spin_unlock(&ps->lock);         /* Allow completions */
 480                         usb_unlink_urb(urb);
 481                         usb_put_urb(urb);
 482                         spin_lock(&ps->lock);
 483                         goto rescan;
 484                 }
 485         }
 486 }
 487
 488 static void async_completed(struct urb *urb)
 489 {
 490         struct async *as = urb->context;
 491         struct dev_state *ps = as->ps;
 492         struct siginfo sinfo;
 493         struct pid *pid = NULL;
 494         u32 secid = 0;
 495         const struct cred *cred = NULL;
 496         int signr;
 497
 498         spin_lock(&ps->lock);
 499         list_move_tail(&as->asynclist, &ps->async_completed);
 500         as->status = urb->status;
 501         signr = as->signr;
 502         if (signr) {
 503                 sinfo.si_signo = as->signr;
 504                 sinfo.si_errno = as->status;
 505                 sinfo.si_code = SI_ASYNCIO;
 506                 sinfo.si_addr = as->userurb;
 507                 pid = get_pid(as->pid);
 508                 cred = get_cred(as->cred);
 509                 secid = as->secid;
 510         }
 511         snoop(&urb->dev->dev, "urb complete\n");
 512         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 513                         as->status, COMPLETE, NULL, 0);
 514         if ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_IN)
 515                 snoop_urb_data(urb, urb->actual_length);
 516
 517         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 518                         as->status != -ENOENT)
 519                 cancel_bulk_urbs(ps, as->bulk_addr);
 520         spin_unlock(&ps->lock);
 521
 522         if (signr) {
 523                 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
 524                 put_pid(pid);
 525                 put_cred(cred);
 526         }
 527
 528         wake_up(&ps->wait);
 529 }
 530
 531 static void destroy_async(struct dev_state *ps, struct list_head *list)
 532 {
 533         struct urb *urb;
 534         struct async *as;
 535         unsigned long flags;
 536
 537         spin_lock_irqsave(&ps->lock, flags);
 538         while (!list_empty(list)) {
 539                 as = list_entry(list->next, struct async, asynclist);
 540                 list_del_init(&as->asynclist);
 541                 urb = as->urb;
 542                 usb_get_urb(urb);
 543
 544                 /* drop the spinlock so the completion handler can run */
 545                 spin_unlock_irqrestore(&ps->lock, flags);
 546                 usb_kill_urb(urb);
 547                 usb_put_urb(urb);
 548                 spin_lock_irqsave(&ps->lock, flags);
 549         }
 550         spin_unlock_irqrestore(&ps->lock, flags);
 551 }
 552
 553 static void destroy_async_on_interface(struct dev_state *ps,
 554                                        unsigned int ifnum)
 555 {
 556         struct list_head *p, *q, hitlist;
 557         unsigned long flags;
 558
 559         INIT_LIST_HEAD(&hitlist);
 560         spin_lock_irqsave(&ps->lock, flags);
 561         list_for_each_safe(p, q, &ps->async_pending)
 562                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 563                         list_move_tail(p, &hitlist);
 564         spin_unlock_irqrestore(&ps->lock, flags);
 565         destroy_async(ps, &hitlist);
 566 }
 567
 568 static void destroy_all_async(struct dev_state *ps)
 569 {
 570         destroy_async(ps, &ps->async_pending);
 571 }
 572
 573 /*
 574  * interface claims are made only at the request of user level code,
 575  * which can also release them (explicitly or by closing files).
 576  * they're also undone when devices disconnect.
 577  */
 578
 579 static int driver_probe(struct usb_interface *intf,
 580                         const struct usb_device_id *id)
 581 {
 582         return -ENODEV;
 583 }
 584
 585 static void driver_disconnect(struct usb_interface *intf)
 586 {
 587         struct dev_state *ps = usb_get_intfdata(intf);
 588         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 589
 590         if (!ps)
 591                 return;
 592
 593         /* NOTE:  this relies on usbcore having canceled and completed
 594          * all pending I/O requests; 2.6 does that.
 595          */
 596
 597         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 598                 clear_bit(ifnum, &ps->ifclaimed);
 599         else
 600                 dev_warn(&intf->dev, "interface number %u out of range\n",
 601                          ifnum);
 602
 603         usb_set_intfdata(intf, NULL);
 604
 605         /* force async requests to complete */
 606         destroy_async_on_interface(ps, ifnum);
 607 }
 608
 609 /* The following routines are merely placeholders.  There is no way
 610  * to inform a user task about suspend or resumes.
 611  */
 612 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 613 {
 614         return 0;
 615 }
 616
 617 static int driver_resume(struct usb_interface *intf)
 618 {
 619         return 0;
 620 }
 621
 622 struct usb_driver usbfs_driver = {
 623         .name =         "usbfs",
 624         .probe =        driver_probe,
 625         .disconnect =   driver_disconnect,
 626         .suspend =      driver_suspend,
 627         .resume =       driver_resume,
 628 };
 629
 630 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 631 {
 632         struct usb_device *dev = ps->dev;
 633         struct usb_interface *intf;
 634         int err;
 635
 636         if (ifnum >= 8*sizeof(ps->ifclaimed))
 637                 return -EINVAL;
 638         /* already claimed */
 639         if (test_bit(ifnum, &ps->ifclaimed))
 640                 return 0;
 641
 642         intf = usb_ifnum_to_if(dev, ifnum);
 643         if (!intf)
 644                 err = -ENOENT;
 645         else
 646                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 647         if (err == 0)
 648                 set_bit(ifnum, &ps->ifclaimed);
 649         return err;
 650 }
 651
 652 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 653 {
 654         struct usb_device *dev;
 655         struct usb_interface *intf;
 656         int err;
 657
 658         err = -EINVAL;
 659         if (ifnum >= 8*sizeof(ps->ifclaimed))
 660                 return err;
 661         dev = ps->dev;
 662         intf = usb_ifnum_to_if(dev, ifnum);
 663         if (!intf)
 664                 err = -ENOENT;
 665         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 666                 usb_driver_release_interface(&usbfs_driver, intf);
 667                 err = 0;
 668         }
 669         return err;
 670 }
 671
 672 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 673 {
 674         if (ps->dev->state != USB_STATE_CONFIGURED)
 675                 return -EHOSTUNREACH;
 676         if (ifnum >= 8*sizeof(ps->ifclaimed))
 677                 return -EINVAL;
 678         if (test_bit(ifnum, &ps->ifclaimed))
 679                 return 0;
 680         /* if not yet claimed, claim it for the driver */
 681         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 682                  "interface %u before use\n", task_pid_nr(current),
 683                  current->comm, ifnum);
 684         return claimintf(ps, ifnum);
 685 }
 686
 687 static int findintfep(struct usb_device *dev, unsigned int ep)
 688 {
 689         unsigned int i, j, e;
 690         struct usb_interface *intf;
 691         struct usb_host_interface *alts;
 692         struct usb_endpoint_descriptor *endpt;
 693
 694         if (ep & ~(USB_DIR_IN|0xf))
 695                 return -EINVAL;
 696         if (!dev->actconfig)
 697                 return -ESRCH;
 698         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 699                 intf = dev->actconfig->interface[i];
 700                 for (j = 0; j < intf->num_altsetting; j++) {
 701                         alts = &intf->altsetting[j];
 702                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 703                                 endpt = &alts->endpoint[e].desc;
 704                                 if (endpt->bEndpointAddress == ep)
 705                                         return alts->desc.bInterfaceNumber;
 706                         }
 707                 }
 708         }
 709         return -ENOENT;
 710 }
 711
 712 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 713                            unsigned int request, unsigned int index)
 714 {
 715         int ret = 0;
 716         struct usb_host_interface *alt_setting;
 717
 718         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 719          && ps->dev->state != USB_STATE_ADDRESS
 720          && ps->dev->state != USB_STATE_CONFIGURED)
 721                 return -EHOSTUNREACH;
 722         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 723                 return 0;
 724
 725         /*
 726          * check for the special corner case 'get_device_id' in the printer
 727          * class specification, where wIndex is (interface << 8 | altsetting)
 728          * instead of just interface
 729          */
 730         if (requesttype == 0xa1 && request == 0) {
 731                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 732                                                    index >> 8, index & 0xff);
 733                 if (alt_setting
 734                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 735                         index >>= 8;
 736         }
 737
 738         index &= 0xff;
 739         switch (requesttype & USB_RECIP_MASK) {
 740         case USB_RECIP_ENDPOINT:
 741                 ret = findintfep(ps->dev, index);
 742                 if (ret >= 0)
 743                         ret = checkintf(ps, ret);
 744                 break;
 745
 746         case USB_RECIP_INTERFACE:
 747                 ret = checkintf(ps, index);
 748                 break;
 749         }
 750         return ret;
 751 }
 752
 753 static int match_devt(struct device *dev, void *data)
 754 {
 755         return dev->devt == (dev_t) (unsigned long) data;
 756 }
 757
 758 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 759 {
 760         struct device *dev;
 761
 762         dev = bus_find_device(&usb_bus_type, NULL,
 763                               (void *) (unsigned long) devt, match_devt);
 764         if (!dev)
 765                 return NULL;
 766         return container_of(dev, struct usb_device, dev);
 767 }
 768
 769 /*
 770  * file operations
 771  */
 772 static int usbdev_open(struct inode *inode, struct file *file)
 773 {
 774         struct usb_device *dev = NULL;
 775         struct dev_state *ps;
 776         int ret;
 777
 778         ret = -ENOMEM;
 779         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 780         if (!ps)
 781                 goto out_free_ps;
 782
 783         ret = -ENODEV;
 784
 785         /* Protect against simultaneous removal or release */
 786         mutex_lock(&usbfs_mutex);
 787
 788         /* usbdev device-node */
 789         if (imajor(inode) == USB_DEVICE_MAJOR)
 790                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 791
 792         mutex_unlock(&usbfs_mutex);
 793
 794         if (!dev)
 795                 goto out_free_ps;
 796
 797         usb_lock_device(dev);
 798         if (dev->state == USB_STATE_NOTATTACHED)
 799                 goto out_unlock_device;
 800
 801         ret = usb_autoresume_device(dev);
 802         if (ret)
 803                 goto out_unlock_device;
 804
 805         ps->dev = dev;
 806         ps->file = file;
 807         spin_lock_init(&ps->lock);
 808         INIT_LIST_HEAD(&ps->list);
 809         INIT_LIST_HEAD(&ps->async_pending);
 810         INIT_LIST_HEAD(&ps->async_completed);
 811         init_waitqueue_head(&ps->wait);
 812         ps->discsignr = 0;
 813         ps->disc_pid = get_pid(task_pid(current));
 814         ps->cred = get_current_cred();
 815         ps->disccontext = NULL;
 816         ps->ifclaimed = 0;
 817         security_task_getsecid(current, &ps->secid);
 818         smp_wmb();
 819         list_add_tail(&ps->list, &dev->filelist);
 820         file->private_data = ps;
 821         usb_unlock_device(dev);
 822         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 823                         current->comm);
 824         return ret;
 825
 826  out_unlock_device:
 827         usb_unlock_device(dev);
 828         usb_put_dev(dev);
 829  out_free_ps:
 830         kfree(ps);
 831         return ret;
 832 }
 833
 834 static int usbdev_release(struct inode *inode, struct file *file)
 835 {
 836         struct dev_state *ps = file->private_data;
 837         struct usb_device *dev = ps->dev;
 838         unsigned int ifnum;
 839         struct async *as;
 840
 841         usb_lock_device(dev);
 842         usb_hub_release_all_ports(dev, ps);
 843
 844         list_del_init(&ps->list);
 845
 846         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 847                         ifnum++) {
 848                 if (test_bit(ifnum, &ps->ifclaimed))
 849                         releaseintf(ps, ifnum);
 850         }
 851         destroy_all_async(ps);
 852         usb_autosuspend_device(dev);
 853         usb_unlock_device(dev);
 854         usb_put_dev(dev);
 855         put_pid(ps->disc_pid);
 856         put_cred(ps->cred);
 857
 858         as = async_getcompleted(ps);
 859         while (as) {
 860                 free_async(as);
 861                 as = async_getcompleted(ps);
 862         }
 863         kfree(ps);
 864         return 0;
 865 }
 866
 867 static int proc_control(struct dev_state *ps, void __user *arg)
 868 {
 869         struct usb_device *dev = ps->dev;
 870         struct usbdevfs_ctrltransfer ctrl;
 871         unsigned int tmo;
 872         unsigned char *tbuf;
 873         unsigned wLength;
 874         int i, pipe, ret;
 875
 876         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 877                 return -EFAULT;
 878         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
 879                               ctrl.wIndex);
 880         if (ret)
 881                 return ret;
 882         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 883         if (wLength > PAGE_SIZE)
 884                 return -EINVAL;
 885         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
 886                         sizeof(struct usb_ctrlrequest));
 887         if (ret)
 888                 return ret;
 889         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 890         if (!tbuf) {
 891                 ret = -ENOMEM;
 892                 goto done;
 893         }
 894         tmo = ctrl.timeout;
 895         snoop(&dev->dev, "control urb: bRequestType=%02x "
 896                 "bRequest=%02x wValue=%04x "
 897                 "wIndex=%04x wLength=%04x\n",
 898                 ctrl.bRequestType, ctrl.bRequest,
 899                 __le16_to_cpup(&ctrl.wValue),
 900                 __le16_to_cpup(&ctrl.wIndex),
 901                 __le16_to_cpup(&ctrl.wLength));
 902         if (ctrl.bRequestType & 0x80) {
 903                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 904                                                ctrl.wLength)) {
 905                         ret = -EINVAL;
 906                         goto done;
 907                 }
 908                 pipe = usb_rcvctrlpipe(dev, 0);
 909                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
 910
 911                 usb_unlock_device(dev);
 912                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
 913                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 914                                     tbuf, ctrl.wLength, tmo);
 915                 usb_lock_device(dev);
 916                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
 917                           tbuf, max(i, 0));
 918                 if ((i > 0) && ctrl.wLength) {
 919                         if (copy_to_user(ctrl.data, tbuf, i)) {
 920                                 ret = -EFAULT;
 921                                 goto done;
 922                         }
 923                 }
 924         } else {
 925                 if (ctrl.wLength) {
 926                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 927                                 ret = -EFAULT;
 928                                 goto done;
 929                         }
 930                 }
 931                 pipe = usb_sndctrlpipe(dev, 0);
 932                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
 933                         tbuf, ctrl.wLength);
 934
 935                 usb_unlock_device(dev);
 936                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 937                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 938                                     tbuf, ctrl.wLength, tmo);
 939                 usb_lock_device(dev);
 940                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
 941         }
 942         if (i < 0 && i != -EPIPE) {
 943                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 944                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 945                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 946                            ctrl.wLength, i);
 947         }
 948         ret = i;
 949  done:
 950         free_page((unsigned long) tbuf);
 951         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
 952                         sizeof(struct usb_ctrlrequest));
 953         return ret;
 954 }
 955
 956 static int proc_bulk(struct dev_state *ps, void __user *arg)
 957 {
 958         struct usb_device *dev = ps->dev;
 959         struct usbdevfs_bulktransfer bulk;
 960         unsigned int tmo, len1, pipe;
 961         int len2;
 962         unsigned char *tbuf;
 963         int i, ret;
 964
 965         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 966                 return -EFAULT;
 967         ret = findintfep(ps->dev, bulk.ep);
 968         if (ret < 0)
 969                 return ret;
 970         ret = checkintf(ps, ret);
 971         if (ret)
 972                 return ret;
 973         if (bulk.ep & USB_DIR_IN)
 974                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 975         else
 976                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 977         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 978                 return -EINVAL;
 979         len1 = bulk.len;
 980         if (len1 >= USBFS_XFER_MAX)
 981                 return -EINVAL;
 982         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
 983         if (ret)
 984                 return ret;
 985         if (!(tbuf = kmalloc(len1, GFP_KERNEL))) {
 986                 ret = -ENOMEM;
 987                 goto done;
 988         }
 989         tmo = bulk.timeout;
 990         if (bulk.ep & 0x80) {
 991                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
 992                         ret = -EINVAL;
 993                         goto done;
 994                 }
 995                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
 996
 997                 usb_unlock_device(dev);
 998                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
 999                 usb_lock_device(dev);
1000                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1001
1002                 if (!i && len2) {
1003                         if (copy_to_user(bulk.data, tbuf, len2)) {
1004                                 ret = -EFAULT;
1005                                 goto done;
1006                         }
1007                 }
1008         } else {
1009                 if (len1) {
1010                         if (copy_from_user(tbuf, bulk.data, len1)) {
1011                                 ret = -EFAULT;
1012                                 goto done;
1013                         }
1014                 }
1015                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1016
1017                 usb_unlock_device(dev);
1018                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1019                 usb_lock_device(dev);
1020                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1021         }
1022         ret = (i < 0 ? i : len2);
1023  done:
1024         kfree(tbuf);
1025         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1026         return ret;
1027 }
1028
1029 static int proc_resetep(struct dev_state *ps, void __user *arg)
1030 {
1031         unsigned int ep;
1032         int ret;
1033
1034         if (get_user(ep, (unsigned int __user *)arg))
1035                 return -EFAULT;
1036         ret = findintfep(ps->dev, ep);
1037         if (ret < 0)
1038                 return ret;
1039         ret = checkintf(ps, ret);
1040         if (ret)
1041                 return ret;
1042         usb_reset_endpoint(ps->dev, ep);
1043         return 0;
1044 }
1045
1046 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
1047 {
1048         unsigned int ep;
1049         int pipe;
1050         int ret;
1051
1052         if (get_user(ep, (unsigned int __user *)arg))
1053                 return -EFAULT;
1054         ret = findintfep(ps->dev, ep);
1055         if (ret < 0)
1056                 return ret;
1057         ret = checkintf(ps, ret);
1058         if (ret)
1059                 return ret;
1060         if (ep & USB_DIR_IN)
1061                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1062         else
1063                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1064
1065         return usb_clear_halt(ps->dev, pipe);
1066 }
1067
1068 static int proc_getdriver(struct dev_state *ps, void __user *arg)
1069 {
1070         struct usbdevfs_getdriver gd;
1071         struct usb_interface *intf;
1072         int ret;
1073
1074         if (copy_from_user(&gd, arg, sizeof(gd)))
1075                 return -EFAULT;
1076         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1077         if (!intf || !intf->dev.driver)
1078                 ret = -ENODATA;
1079         else {
1080                 strncpy(gd.driver, intf->dev.driver->name,
1081                                 sizeof(gd.driver));
1082                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1083         }
1084         return ret;
1085 }
1086
1087 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
1088 {
1089         struct usbdevfs_connectinfo ci = {
1090                 .devnum = ps->dev->devnum,
1091                 .slow = ps->dev->speed == USB_SPEED_LOW
1092         };
1093
1094         if (copy_to_user(arg, &ci, sizeof(ci)))
1095                 return -EFAULT;
1096         return 0;
1097 }
1098
1099 static int proc_resetdevice(struct dev_state *ps)
1100 {
1101         return usb_reset_device(ps->dev);
1102 }
1103
1104 static int proc_setintf(struct dev_state *ps, void __user *arg)
1105 {
1106         struct usbdevfs_setinterface setintf;
1107         int ret;
1108
1109         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1110                 return -EFAULT;
1111         if ((ret = checkintf(ps, setintf.interface)))
1112                 return ret;
1113         return usb_set_interface(ps->dev, setintf.interface,
1114                         setintf.altsetting);
1115 }
1116
1117 static int proc_setconfig(struct dev_state *ps, void __user *arg)
1118 {
1119         int u;
1120         int status = 0;
1121         struct usb_host_config *actconfig;
1122
1123         if (get_user(u, (int __user *)arg))
1124                 return -EFAULT;
1125
1126         actconfig = ps->dev->actconfig;
1127
1128         /* Don't touch the device if any interfaces are claimed.
1129          * It could interfere with other drivers' operations, and if
1130          * an interface is claimed by usbfs it could easily deadlock.
1131          */
1132         if (actconfig) {
1133                 int i;
1134
1135                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1136                         if (usb_interface_claimed(actconfig->interface[i])) {
1137                                 dev_warn(&ps->dev->dev,
1138                                         "usbfs: interface %d claimed by %s "
1139                                         "while '%s' sets config #%d\n",
1140                                         actconfig->interface[i]
1141                                                 ->cur_altsetting
1142                                                 ->desc.bInterfaceNumber,
1143                                         actconfig->interface[i]
1144                                                 ->dev.driver->name,
1145                                         current->comm, u);
1146                                 status = -EBUSY;
1147                                 break;
1148                         }
1149                 }
1150         }
1151
1152         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1153          * so avoid usb_set_configuration()'s kick to sysfs
1154          */
1155         if (status == 0) {
1156                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1157                         status = usb_reset_configuration(ps->dev);
1158                 else
1159                         status = usb_set_configuration(ps->dev, u);
1160         }
1161
1162         return status;
1163 }
1164
1165 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1166                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1167                         void __user *arg)
1168 {
1169         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1170         struct usb_host_endpoint *ep;
1171         struct async *as = NULL;
1172         struct usb_ctrlrequest *dr = NULL;
1173         unsigned int u, totlen, isofrmlen;
1174         int i, ret, is_in, num_sgs = 0, ifnum = -1;
1175         void *buf;
1176
1177         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1178                                 USBDEVFS_URB_SHORT_NOT_OK |
1179                                 USBDEVFS_URB_BULK_CONTINUATION |
1180                                 USBDEVFS_URB_NO_FSBR |
1181                                 USBDEVFS_URB_ZERO_PACKET |
1182                                 USBDEVFS_URB_NO_INTERRUPT))
1183                 return -EINVAL;
1184         if (uurb->buffer_length > 0 && !uurb->buffer)
1185                 return -EINVAL;
1186         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1187             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1188                 ifnum = findintfep(ps->dev, uurb->endpoint);
1189                 if (ifnum < 0)
1190                         return ifnum;
1191                 ret = checkintf(ps, ifnum);
1192                 if (ret)
1193                         return ret;
1194         }
1195         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1196                 is_in = 1;
1197                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1198         } else {
1199                 is_in = 0;
1200                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1201         }
1202         if (!ep)
1203                 return -ENOENT;
1204
1205         u = 0;
1206         switch(uurb->type) {
1207         case USBDEVFS_URB_TYPE_CONTROL:
1208                 if (!usb_endpoint_xfer_control(&ep->desc))
1209                         return -EINVAL;
1210                 /* min 8 byte setup packet */
1211                 if (uurb->buffer_length < 8)
1212                         return -EINVAL;
1213                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1214                 if (!dr)
1215                         return -ENOMEM;
1216                 if (copy_from_user(dr, uurb->buffer, 8)) {
1217                         ret = -EFAULT;
1218                         goto error;
1219                 }
1220                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1221                         ret = -EINVAL;
1222                         goto error;
1223                 }
1224                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1225                                       le16_to_cpup(&dr->wIndex));
1226                 if (ret)
1227                         goto error;
1228                 uurb->number_of_packets = 0;
1229                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1230                 uurb->buffer += 8;
1231                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1232                         is_in = 1;
1233                         uurb->endpoint |= USB_DIR_IN;
1234                 } else {
1235                         is_in = 0;
1236                         uurb->endpoint &= ~USB_DIR_IN;
1237                 }
1238                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1239                         "bRequest=%02x wValue=%04x "
1240                         "wIndex=%04x wLength=%04x\n",
1241                         dr->bRequestType, dr->bRequest,
1242                         __le16_to_cpup(&dr->wValue),
1243                         __le16_to_cpup(&dr->wIndex),
1244                         __le16_to_cpup(&dr->wLength));
1245                 u = sizeof(struct usb_ctrlrequest);
1246                 break;
1247
1248         case USBDEVFS_URB_TYPE_BULK:
1249                 switch (usb_endpoint_type(&ep->desc)) {
1250                 case USB_ENDPOINT_XFER_CONTROL:
1251                 case USB_ENDPOINT_XFER_ISOC:
1252                         return -EINVAL;
1253                 case USB_ENDPOINT_XFER_INT:
1254                         /* allow single-shot interrupt transfers */
1255                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1256                         goto interrupt_urb;
1257                 }
1258                 uurb->number_of_packets = 0;
1259                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1260                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1261                         num_sgs = 0;
1262                 break;
1263
1264         case USBDEVFS_URB_TYPE_INTERRUPT:
1265                 if (!usb_endpoint_xfer_int(&ep->desc))
1266                         return -EINVAL;
1267  interrupt_urb:
1268                 uurb->number_of_packets = 0;
1269                 break;
1270
1271         case USBDEVFS_URB_TYPE_ISO:
1272                 /* arbitrary limit */
1273                 if (uurb->number_of_packets < 1 ||
1274                     uurb->number_of_packets > 128)
1275                         return -EINVAL;
1276                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1277                         return -EINVAL;
1278                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1279                                    uurb->number_of_packets;
1280                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1281                         return -ENOMEM;
1282                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1283                         ret = -EFAULT;
1284                         goto error;
1285                 }
1286                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1287                         /* arbitrary limit,
1288                          * sufficient for USB 2.0 high-bandwidth iso */
1289                         if (isopkt[u].length > 8192) {
1290                                 ret = -EINVAL;
1291                                 goto error;
1292                         }
1293                         totlen += isopkt[u].length;
1294                 }
1295                 u *= sizeof(struct usb_iso_packet_descriptor);
1296                 uurb->buffer_length = totlen;
1297                 break;
1298
1299         default:
1300                 return -EINVAL;
1301         }
1302
1303         if (uurb->buffer_length >= USBFS_XFER_MAX) {
1304                 ret = -EINVAL;
1305                 goto error;
1306         }
1307         if (uurb->buffer_length > 0 &&
1308                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1309                                 uurb->buffer, uurb->buffer_length)) {
1310                 ret = -EFAULT;
1311                 goto error;
1312         }
1313         as = alloc_async(uurb->number_of_packets);
1314         if (!as) {
1315                 ret = -ENOMEM;
1316                 goto error;
1317         }
1318
1319         u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1320              num_sgs * sizeof(struct scatterlist);
1321         ret = usbfs_increase_memory_usage(u);
1322         if (ret)
1323                 goto error;
1324         as->mem_usage = u;
1325
1326         if (num_sgs) {
1327                 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1328                                       GFP_KERNEL);
1329                 if (!as->urb->sg) {
1330                         ret = -ENOMEM;
1331                         goto error;
1332                 }
1333                 as->urb->num_sgs = num_sgs;
1334                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1335
1336                 totlen = uurb->buffer_length;
1337                 for (i = 0; i < as->urb->num_sgs; i++) {
1338                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1339                         buf = kmalloc(u, GFP_KERNEL);
1340                         if (!buf) {
1341                                 ret = -ENOMEM;
1342                                 goto error;
1343                         }
1344                         sg_set_buf(&as->urb->sg[i], buf, u);
1345
1346                         if (!is_in) {
1347                                 if (copy_from_user(buf, uurb->buffer, u)) {
1348                                         ret = -EFAULT;
1349                                         goto error;
1350                                 }
1351                         }
1352                         totlen -= u;
1353                 }
1354         } else if (uurb->buffer_length > 0) {
1355                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1356                                 GFP_KERNEL);
1357                 if (!as->urb->transfer_buffer) {
1358                         ret = -ENOMEM;
1359                         goto error;
1360                 }
1361
1362                 if (!is_in) {
1363                         if (copy_from_user(as->urb->transfer_buffer,
1364                                            uurb->buffer,
1365                                            uurb->buffer_length)) {
1366                                 ret = -EFAULT;
1367                                 goto error;
1368                         }
1369                 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1370                         /*
1371                          * Isochronous input data may end up being
1372                          * discontiguous if some of the packets are short.
1373                          * Clear the buffer so that the gaps don't leak
1374                          * kernel data to userspace.
1375                          */
1376                         memset(as->urb->transfer_buffer, 0,
1377                                         uurb->buffer_length);
1378                 }
1379         }
1380         as->urb->dev = ps->dev;
1381         as->urb->pipe = (uurb->type << 30) |
1382                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1383                         (uurb->endpoint & USB_DIR_IN);
1384
1385         /* This tedious sequence is necessary because the URB_* flags
1386          * are internal to the kernel and subject to change, whereas
1387          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1388          */
1389         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1390         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1391                 u |= URB_ISO_ASAP;
1392         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1393                 u |= URB_SHORT_NOT_OK;
1394         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1395                 u |= URB_NO_FSBR;
1396         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1397                 u |= URB_ZERO_PACKET;
1398         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1399                 u |= URB_NO_INTERRUPT;
1400         as->urb->transfer_flags = u;
1401
1402         as->urb->transfer_buffer_length = uurb->buffer_length;
1403         as->urb->setup_packet = (unsigned char *)dr;
1404         dr = NULL;
1405         as->urb->start_frame = uurb->start_frame;
1406         as->urb->number_of_packets = uurb->number_of_packets;
1407         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1408                         ps->dev->speed == USB_SPEED_HIGH)
1409                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1410         else
1411                 as->urb->interval = ep->desc.bInterval;
1412         as->urb->context = as;
1413         as->urb->complete = async_completed;
1414         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1415                 as->urb->iso_frame_desc[u].offset = totlen;
1416                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1417                 totlen += isopkt[u].length;
1418         }
1419         kfree(isopkt);
1420         isopkt = NULL;
1421         as->ps = ps;
1422         as->userurb = arg;
1423         if (is_in && uurb->buffer_length > 0)
1424                 as->userbuffer = uurb->buffer;
1425         else
1426                 as->userbuffer = NULL;
1427         as->signr = uurb->signr;
1428         as->ifnum = ifnum;
1429         as->pid = get_pid(task_pid(current));
1430         as->cred = get_current_cred();
1431         security_task_getsecid(current, &as->secid);
1432         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1433                         as->urb->transfer_buffer_length, 0, SUBMIT,
1434                         NULL, 0);
1435         if (!is_in)
1436                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1437
1438         async_newpending(as);
1439
1440         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1441                 spin_lock_irq(&ps->lock);
1442
1443                 /* Not exactly the endpoint address; the direction bit is
1444                  * shifted to the 0x10 position so that the value will be
1445                  * between 0 and 31.
1446                  */
1447                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1448                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1449                                 >> 3);
1450
1451                 /* If this bulk URB is the start of a new transfer, re-enable
1452                  * the endpoint.  Otherwise mark it as a continuation URB.
1453                  */
1454                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1455                         as->bulk_status = AS_CONTINUATION;
1456                 else
1457                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1458
1459                 /* Don't accept continuation URBs if the endpoint is
1460                  * disabled because of an earlier error.
1461                  */
1462                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1463                         ret = -EREMOTEIO;
1464                 else
1465                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1466                 spin_unlock_irq(&ps->lock);
1467         } else {
1468                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1469         }
1470
1471         if (ret) {
1472                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1473                            "usbfs: usb_submit_urb returned %d\n", ret);
1474                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1475                                 0, ret, COMPLETE, NULL, 0);
1476                 async_removepending(as);
1477                 goto error;
1478         }
1479         return 0;
1480
1481  error:
1482         kfree(isopkt);
1483         kfree(dr);
1484         if (as)
1485                 free_async(as);
1486         return ret;
1487 }
1488
1489 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1490 {
1491         struct usbdevfs_urb uurb;
1492
1493         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1494                 return -EFAULT;
1495
1496         return proc_do_submiturb(ps, &uurb,
1497                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1498                         arg);
1499 }
1500
1501 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1502 {
1503         struct urb *urb;
1504         struct async *as;
1505         unsigned long flags;
1506
1507         spin_lock_irqsave(&ps->lock, flags);
1508         as = async_getpending(ps, arg);
1509         if (!as) {
1510                 spin_unlock_irqrestore(&ps->lock, flags);
1511                 return -EINVAL;
1512         }
1513
1514         urb = as->urb;
1515         usb_get_urb(urb);
1516         spin_unlock_irqrestore(&ps->lock, flags);
1517
1518         usb_kill_urb(urb);
1519         usb_put_urb(urb);
1520
1521         return 0;
1522 }
1523
1524 static int processcompl(struct async *as, void __user * __user *arg)
1525 {
1526         struct urb *urb = as->urb;
1527         struct usbdevfs_urb __user *userurb = as->userurb;
1528         void __user *addr = as->userurb;
1529         unsigned int i;
1530
1531         if (as->userbuffer && urb->actual_length) {
1532                 if (copy_urb_data_to_user(as->userbuffer, urb))
1533                         goto err_out;
1534         }
1535         if (put_user(as->status, &userurb->status))
1536                 goto err_out;
1537         if (put_user(urb->actual_length, &userurb->actual_length))
1538                 goto err_out;
1539         if (put_user(urb->error_count, &userurb->error_count))
1540                 goto err_out;
1541
1542         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1543                 for (i = 0; i < urb->number_of_packets; i++) {
1544                         if (put_user(urb->iso_frame_desc[i].actual_length,
1545                                      &userurb->iso_frame_desc[i].actual_length))
1546                                 goto err_out;
1547                         if (put_user(urb->iso_frame_desc[i].status,
1548                                      &userurb->iso_frame_desc[i].status))
1549                                 goto err_out;
1550                 }
1551         }
1552
1553         if (put_user(addr, (void __user * __user *)arg))
1554                 return -EFAULT;
1555         return 0;
1556
1557 err_out:
1558         return -EFAULT;
1559 }
1560
1561 static struct async *reap_as(struct dev_state *ps)
1562 {
1563         DECLARE_WAITQUEUE(wait, current);
1564         struct async *as = NULL;
1565         struct usb_device *dev = ps->dev;
1566
1567         add_wait_queue(&ps->wait, &wait);
1568         for (;;) {
1569                 __set_current_state(TASK_INTERRUPTIBLE);
1570                 as = async_getcompleted(ps);
1571                 if (as)
1572                         break;
1573                 if (signal_pending(current))
1574                         break;
1575                 usb_unlock_device(dev);
1576                 schedule();
1577                 usb_lock_device(dev);
1578         }
1579         remove_wait_queue(&ps->wait, &wait);
1580         set_current_state(TASK_RUNNING);
1581         return as;
1582 }
1583
1584 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1585 {
1586         struct async *as = reap_as(ps);
1587         if (as) {
1588                 int retval = processcompl(as, (void __user * __user *)arg);
1589                 free_async(as);
1590                 return retval;
1591         }
1592         if (signal_pending(current))
1593                 return -EINTR;
1594         return -EIO;
1595 }
1596
1597 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1598 {
1599         int retval;
1600         struct async *as;
1601
1602         as = async_getcompleted(ps);
1603         retval = -EAGAIN;
1604         if (as) {
1605                 retval = processcompl(as, (void __user * __user *)arg);
1606                 free_async(as);
1607         }
1608         return retval;
1609 }
1610
1611 #ifdef CONFIG_COMPAT
1612 static int proc_control_compat(struct dev_state *ps,
1613                                 struct usbdevfs_ctrltransfer32 __user *p32)
1614 {
1615         struct usbdevfs_ctrltransfer __user *p;
1616         __u32 udata;
1617         p = compat_alloc_user_space(sizeof(*p));
1618         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1619             get_user(udata, &p32->data) ||
1620             put_user(compat_ptr(udata), &p->data))
1621                 return -EFAULT;
1622         return proc_control(ps, p);
1623 }
1624
1625 static int proc_bulk_compat(struct dev_state *ps,
1626                         struct usbdevfs_bulktransfer32 __user *p32)
1627 {
1628         struct usbdevfs_bulktransfer __user *p;
1629         compat_uint_t n;
1630         compat_caddr_t addr;
1631
1632         p = compat_alloc_user_space(sizeof(*p));
1633
1634         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1635             get_user(n, &p32->len) || put_user(n, &p->len) ||
1636             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1637             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1638                 return -EFAULT;
1639
1640         return proc_bulk(ps, p);
1641 }
1642 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1643 {
1644         struct usbdevfs_disconnectsignal32 ds;
1645
1646         if (copy_from_user(&ds, arg, sizeof(ds)))
1647                 return -EFAULT;
1648         ps->discsignr = ds.signr;
1649         ps->disccontext = compat_ptr(ds.context);
1650         return 0;
1651 }
1652
1653 static int get_urb32(struct usbdevfs_urb *kurb,
1654                      struct usbdevfs_urb32 __user *uurb)
1655 {
1656         __u32  uptr;
1657         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1658             __get_user(kurb->type, &uurb->type) ||
1659             __get_user(kurb->endpoint, &uurb->endpoint) ||
1660             __get_user(kurb->status, &uurb->status) ||
1661             __get_user(kurb->flags, &uurb->flags) ||
1662             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1663             __get_user(kurb->actual_length, &uurb->actual_length) ||
1664             __get_user(kurb->start_frame, &uurb->start_frame) ||
1665             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1666             __get_user(kurb->error_count, &uurb->error_count) ||
1667             __get_user(kurb->signr, &uurb->signr))
1668                 return -EFAULT;
1669
1670         if (__get_user(uptr, &uurb->buffer))
1671                 return -EFAULT;
1672         kurb->buffer = compat_ptr(uptr);
1673         if (__get_user(uptr, &uurb->usercontext))
1674                 return -EFAULT;
1675         kurb->usercontext = compat_ptr(uptr);
1676
1677         return 0;
1678 }
1679
1680 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1681 {
1682         struct usbdevfs_urb uurb;
1683
1684         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1685                 return -EFAULT;
1686
1687         return proc_do_submiturb(ps, &uurb,
1688                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1689                         arg);
1690 }
1691
1692 static int processcompl_compat(struct async *as, void __user * __user *arg)
1693 {
1694         struct urb *urb = as->urb;
1695         struct usbdevfs_urb32 __user *userurb = as->userurb;
1696         void __user *addr = as->userurb;
1697         unsigned int i;
1698
1699         if (as->userbuffer && urb->actual_length) {
1700                 if (copy_urb_data_to_user(as->userbuffer, urb))
1701                         return -EFAULT;
1702         }
1703         if (put_user(as->status, &userurb->status))
1704                 return -EFAULT;
1705         if (put_user(urb->actual_length, &userurb->actual_length))
1706                 return -EFAULT;
1707         if (put_user(urb->error_count, &userurb->error_count))
1708                 return -EFAULT;
1709
1710         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1711                 for (i = 0; i < urb->number_of_packets; i++) {
1712                         if (put_user(urb->iso_frame_desc[i].actual_length,
1713                                      &userurb->iso_frame_desc[i].actual_length))
1714                                 return -EFAULT;
1715                         if (put_user(urb->iso_frame_desc[i].status,
1716                                      &userurb->iso_frame_desc[i].status))
1717                                 return -EFAULT;
1718                 }
1719         }
1720
1721         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1722                 return -EFAULT;
1723         return 0;
1724 }
1725
1726 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1727 {
1728         struct async *as = reap_as(ps);
1729         if (as) {
1730                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1731                 free_async(as);
1732                 return retval;
1733         }
1734         if (signal_pending(current))
1735                 return -EINTR;
1736         return -EIO;
1737 }
1738
1739 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1740 {
1741         int retval;
1742         struct async *as;
1743
1744         retval = -EAGAIN;
1745         as = async_getcompleted(ps);
1746         if (as) {
1747                 retval = processcompl_compat(as, (void __user * __user *)arg);
1748                 free_async(as);
1749         }
1750         return retval;
1751 }
1752
1753
1754 #endif
1755
1756 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1757 {
1758         struct usbdevfs_disconnectsignal ds;
1759
1760         if (copy_from_user(&ds, arg, sizeof(ds)))
1761                 return -EFAULT;
1762         ps->discsignr = ds.signr;
1763         ps->disccontext = ds.context;
1764         return 0;
1765 }
1766
1767 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1768 {
1769         unsigned int ifnum;
1770
1771         if (get_user(ifnum, (unsigned int __user *)arg))
1772                 return -EFAULT;
1773         return claimintf(ps, ifnum);
1774 }
1775
1776 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1777 {
1778         unsigned int ifnum;
1779         int ret;
1780
1781         if (get_user(ifnum, (unsigned int __user *)arg))
1782                 return -EFAULT;
1783         if ((ret = releaseintf(ps, ifnum)) < 0)
1784                 return ret;
1785         destroy_async_on_interface (ps, ifnum);
1786         return 0;
1787 }
1788
1789 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1790 {
1791         int                     size;
1792         void                    *buf = NULL;
1793         int                     retval = 0;
1794         struct usb_interface    *intf = NULL;
1795         struct usb_driver       *driver = NULL;
1796
1797         /* alloc buffer */
1798         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1799                 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL)
1800                         return -ENOMEM;
1801                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1802                         if (copy_from_user(buf, ctl->data, size)) {
1803                                 kfree(buf);
1804                                 return -EFAULT;
1805                         }
1806                 } else {
1807                         memset(buf, 0, size);
1808                 }
1809         }
1810
1811         if (!connected(ps)) {
1812                 kfree(buf);
1813                 return -ENODEV;
1814         }
1815
1816         if (ps->dev->state != USB_STATE_CONFIGURED)
1817                 retval = -EHOSTUNREACH;
1818         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1819                 retval = -EINVAL;
1820         else switch (ctl->ioctl_code) {
1821
1822         /* disconnect kernel driver from interface */
1823         case USBDEVFS_DISCONNECT:
1824                 if (intf->dev.driver) {
1825                         driver = to_usb_driver(intf->dev.driver);
1826                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1827                         usb_driver_release_interface(driver, intf);
1828                 } else
1829                         retval = -ENODATA;
1830                 break;
1831
1832         /* let kernel drivers try to (re)bind to the interface */
1833         case USBDEVFS_CONNECT:
1834                 if (!intf->dev.driver)
1835                         retval = device_attach(&intf->dev);
1836                 else
1837                         retval = -EBUSY;
1838                 break;
1839
1840         /* talk directly to the interface's driver */
1841         default:
1842                 if (intf->dev.driver)
1843                         driver = to_usb_driver(intf->dev.driver);
1844                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1845                         retval = -ENOTTY;
1846                 } else {
1847                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1848                         if (retval == -ENOIOCTLCMD)
1849                                 retval = -ENOTTY;
1850                 }
1851         }
1852
1853         /* cleanup and return */
1854         if (retval >= 0
1855                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1856                         && size > 0
1857                         && copy_to_user(ctl->data, buf, size) != 0)
1858                 retval = -EFAULT;
1859
1860         kfree(buf);
1861         return retval;
1862 }
1863
1864 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1865 {
1866         struct usbdevfs_ioctl   ctrl;
1867
1868         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1869                 return -EFAULT;
1870         return proc_ioctl(ps, &ctrl);
1871 }
1872
1873 #ifdef CONFIG_COMPAT
1874 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1875 {
1876         struct usbdevfs_ioctl32 __user *uioc;
1877         struct usbdevfs_ioctl ctrl;
1878         u32 udata;
1879
1880         uioc = compat_ptr((long)arg);
1881         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1882             __get_user(ctrl.ifno, &uioc->ifno) ||
1883             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1884             __get_user(udata, &uioc->data))
1885                 return -EFAULT;
1886         ctrl.data = compat_ptr(udata);
1887
1888         return proc_ioctl(ps, &ctrl);
1889 }
1890 #endif
1891
1892 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1893 {
1894         unsigned portnum;
1895         int rc;
1896
1897         if (get_user(portnum, (unsigned __user *) arg))
1898                 return -EFAULT;
1899         rc = usb_hub_claim_port(ps->dev, portnum, ps);
1900         if (rc == 0)
1901                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1902                         portnum, task_pid_nr(current), current->comm);
1903         return rc;
1904 }
1905
1906 static int proc_release_port(struct dev_state *ps, void __user *arg)
1907 {
1908         unsigned portnum;
1909
1910         if (get_user(portnum, (unsigned __user *) arg))
1911                 return -EFAULT;
1912         return usb_hub_release_port(ps->dev, portnum, ps);
1913 }
1914
1915 static int proc_get_capabilities(struct dev_state *ps, void __user *arg)
1916 {
1917         __u32 caps;
1918
1919         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM;
1920         if (!ps->dev->bus->no_stop_on_short)
1921                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
1922         if (ps->dev->bus->sg_tablesize)
1923                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
1924
1925         if (put_user(caps, (__u32 __user *)arg))
1926                 return -EFAULT;
1927
1928         return 0;
1929 }
1930
1931 static int proc_disconnect_claim(struct dev_state *ps, void __user *arg)
1932 {
1933         struct usbdevfs_disconnect_claim dc;
1934         struct usb_interface *intf;
1935
1936         if (copy_from_user(&dc, arg, sizeof(dc)))
1937                 return -EFAULT;
1938
1939         intf = usb_ifnum_to_if(ps->dev, dc.interface);
1940         if (!intf)
1941                 return -EINVAL;
1942
1943         if (intf->dev.driver) {
1944                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
1945
1946                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
1947                                 strncmp(dc.driver, intf->dev.driver->name,
1948                                         sizeof(dc.driver)) != 0)
1949                         return -EBUSY;
1950
1951                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
1952                                 strncmp(dc.driver, intf->dev.driver->name,
1953                                         sizeof(dc.driver)) == 0)
1954                         return -EBUSY;
1955
1956                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1957                 usb_driver_release_interface(driver, intf);
1958         }
1959
1960         return claimintf(ps, dc.interface);
1961 }
1962
1963 /*
1964  * NOTE:  All requests here that have interface numbers as parameters
1965  * are assuming that somehow the configuration has been prevented from
1966  * changing.  But there's no mechanism to ensure that...
1967  */
1968 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1969                                 void __user *p)
1970 {
1971         struct dev_state *ps = file->private_data;
1972         struct inode *inode = file->f_path.dentry->d_inode;
1973         struct usb_device *dev = ps->dev;
1974         int ret = -ENOTTY;
1975
1976         if (!(file->f_mode & FMODE_WRITE))
1977                 return -EPERM;
1978
1979         usb_lock_device(dev);
1980         if (!connected(ps)) {
1981                 usb_unlock_device(dev);
1982                 return -ENODEV;
1983         }
1984
1985         switch (cmd) {
1986         case USBDEVFS_CONTROL:
1987                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
1988                 ret = proc_control(ps, p);
1989                 if (ret >= 0)
1990                         inode->i_mtime = CURRENT_TIME;
1991                 break;
1992
1993         case USBDEVFS_BULK:
1994                 snoop(&dev->dev, "%s: BULK\n", __func__);
1995                 ret = proc_bulk(ps, p);
1996                 if (ret >= 0)
1997                         inode->i_mtime = CURRENT_TIME;
1998                 break;
1999
2000         case USBDEVFS_RESETEP:
2001                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2002                 ret = proc_resetep(ps, p);
2003                 if (ret >= 0)
2004                         inode->i_mtime = CURRENT_TIME;
2005                 break;
2006
2007         case USBDEVFS_RESET:
2008                 snoop(&dev->dev, "%s: RESET\n", __func__);
2009                 ret = proc_resetdevice(ps);
2010                 break;
2011
2012         case USBDEVFS_CLEAR_HALT:
2013                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2014                 ret = proc_clearhalt(ps, p);
2015                 if (ret >= 0)
2016                         inode->i_mtime = CURRENT_TIME;
2017                 break;
2018
2019         case USBDEVFS_GETDRIVER:
2020                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2021                 ret = proc_getdriver(ps, p);
2022                 break;
2023
2024         case USBDEVFS_CONNECTINFO:
2025                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2026                 ret = proc_connectinfo(ps, p);
2027                 break;
2028
2029         case USBDEVFS_SETINTERFACE:
2030                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2031                 ret = proc_setintf(ps, p);
2032                 break;
2033
2034         case USBDEVFS_SETCONFIGURATION:
2035                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2036                 ret = proc_setconfig(ps, p);
2037                 break;
2038
2039         case USBDEVFS_SUBMITURB:
2040                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2041                 ret = proc_submiturb(ps, p);
2042                 if (ret >= 0)
2043                         inode->i_mtime = CURRENT_TIME;
2044                 break;
2045
2046 #ifdef CONFIG_COMPAT
2047         case USBDEVFS_CONTROL32:
2048                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2049                 ret = proc_control_compat(ps, p);
2050                 if (ret >= 0)
2051                         inode->i_mtime = CURRENT_TIME;
2052                 break;
2053
2054         case USBDEVFS_BULK32:
2055                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2056                 ret = proc_bulk_compat(ps, p);
2057                 if (ret >= 0)
2058                         inode->i_mtime = CURRENT_TIME;
2059                 break;
2060
2061         case USBDEVFS_DISCSIGNAL32:
2062                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2063                 ret = proc_disconnectsignal_compat(ps, p);
2064                 break;
2065
2066         case USBDEVFS_SUBMITURB32:
2067                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2068                 ret = proc_submiturb_compat(ps, p);
2069                 if (ret >= 0)
2070                         inode->i_mtime = CURRENT_TIME;
2071                 break;
2072
2073         case USBDEVFS_REAPURB32:
2074                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2075                 ret = proc_reapurb_compat(ps, p);
2076                 break;
2077
2078         case USBDEVFS_REAPURBNDELAY32:
2079                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2080                 ret = proc_reapurbnonblock_compat(ps, p);
2081                 break;
2082
2083         case USBDEVFS_IOCTL32:
2084                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2085                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2086                 break;
2087 #endif
2088
2089         case USBDEVFS_DISCARDURB:
2090                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2091                 ret = proc_unlinkurb(ps, p);
2092                 break;
2093
2094         case USBDEVFS_REAPURB:
2095                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2096                 ret = proc_reapurb(ps, p);
2097                 break;
2098
2099         case USBDEVFS_REAPURBNDELAY:
2100                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2101                 ret = proc_reapurbnonblock(ps, p);
2102                 break;
2103
2104         case USBDEVFS_DISCSIGNAL:
2105                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2106                 ret = proc_disconnectsignal(ps, p);
2107                 break;
2108
2109         case USBDEVFS_CLAIMINTERFACE:
2110                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2111                 ret = proc_claiminterface(ps, p);
2112                 break;
2113
2114         case USBDEVFS_RELEASEINTERFACE:
2115                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2116                 ret = proc_releaseinterface(ps, p);
2117                 break;
2118
2119         case USBDEVFS_IOCTL:
2120                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2121                 ret = proc_ioctl_default(ps, p);
2122                 break;
2123
2124         case USBDEVFS_CLAIM_PORT:
2125                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2126                 ret = proc_claim_port(ps, p);
2127                 break;
2128
2129         case USBDEVFS_RELEASE_PORT:
2130                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2131                 ret = proc_release_port(ps, p);
2132                 break;
2133         case USBDEVFS_GET_CAPABILITIES:
2134                 ret = proc_get_capabilities(ps, p);
2135                 break;
2136         case USBDEVFS_DISCONNECT_CLAIM:
2137                 ret = proc_disconnect_claim(ps, p);
2138                 break;
2139         }
2140         usb_unlock_device(dev);
2141         if (ret >= 0)
2142                 inode->i_atime = CURRENT_TIME;
2143         return ret;
2144 }
2145
2146 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2147                         unsigned long arg)
2148 {
2149         int ret;
2150
2151         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2152
2153         return ret;
2154 }
2155
2156 #ifdef CONFIG_COMPAT
2157 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2158                         unsigned long arg)
2159 {
2160         int ret;
2161
2162         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2163
2164         return ret;
2165 }
2166 #endif
2167
2168 /* No kernel lock - fine */
2169 static unsigned int usbdev_poll(struct file *file,
2170                                 struct poll_table_struct *wait)
2171 {
2172         struct dev_state *ps = file->private_data;
2173         unsigned int mask = 0;
2174
2175         poll_wait(file, &ps->wait, wait);
2176         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2177                 mask |= POLLOUT | POLLWRNORM;
2178         if (!connected(ps))
2179                 mask |= POLLERR | POLLHUP;
2180         return mask;
2181 }
2182
2183 const struct file_operations usbdev_file_operations = {
2184         .owner =          THIS_MODULE,
2185         .llseek =         usbdev_lseek,
2186         .read =           usbdev_read,
2187         .poll =           usbdev_poll,
2188         .unlocked_ioctl = usbdev_ioctl,
2189 #ifdef CONFIG_COMPAT
2190         .compat_ioctl =   usbdev_compat_ioctl,
2191 #endif
2192         .open =           usbdev_open,
2193         .release =        usbdev_release,
2194 };
2195
2196 static void usbdev_remove(struct usb_device *udev)
2197 {
2198         struct dev_state *ps;
2199         struct siginfo sinfo;
2200
2201         while (!list_empty(&udev->filelist)) {
2202                 ps = list_entry(udev->filelist.next, struct dev_state, list);
2203                 destroy_all_async(ps);
2204                 wake_up_all(&ps->wait);
2205                 list_del_init(&ps->list);
2206                 if (ps->discsignr) {
2207                         sinfo.si_signo = ps->discsignr;
2208                         sinfo.si_errno = EPIPE;
2209                         sinfo.si_code = SI_ASYNCIO;
2210                         sinfo.si_addr = ps->disccontext;
2211                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2212                                         ps->disc_pid, ps->cred, ps->secid);
2213                 }
2214         }
2215 }
2216
2217 static int usbdev_notify(struct notifier_block *self,
2218                                unsigned long action, void *dev)
2219 {
2220         switch (action) {
2221         case USB_DEVICE_ADD:
2222                 break;
2223         case USB_DEVICE_REMOVE:
2224                 usbdev_remove(dev);
2225                 break;
2226         }
2227         return NOTIFY_OK;
2228 }
2229
2230 static struct notifier_block usbdev_nb = {
2231         .notifier_call =        usbdev_notify,
2232 };
2233
2234 static struct cdev usb_device_cdev;
2235
2236 int __init usb_devio_init(void)
2237 {
2238         int retval;
2239
2240         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2241                                         "usb_device");
2242         if (retval) {
2243                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2244                 goto out;
2245         }
2246         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2247         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2248         if (retval) {
2249                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2250                        USB_DEVICE_MAJOR);
2251                 goto error_cdev;
2252         }
2253         usb_register_notify(&usbdev_nb);
2254 out:
2255         return retval;
2256
2257 error_cdev:
2258         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2259         goto out;
2260 }
2261
2262 void usb_devio_cleanup(void)
2263 {
2264         usb_unregister_notify(&usbdev_nb);
2265         cdev_del(&usb_device_cdev);
2266         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2267 }