kernel/drivers/usb/core/devio.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  This file implements the usbfs/x/y files, where
  23  *  x is the bus number and y the device number.
  24  *
  25  *  It allows user space programs/"drivers" to communicate directly
  26  *  with USB devices without intervening kernel driver.
  27  *
  28  *  Revision history
  29  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  30  *    04.01.2000   0.2   Turned into its own filesystem
  31  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  32  *                       (CAN-2005-3055)
  33  */
  34
  35 /*****************************************************************************/
  36
  37 #include <linux/fs.h>
  38 #include <linux/mm.h>
  39 #include <linux/slab.h>
  40 #include <linux/signal.h>
  41 #include <linux/poll.h>
  42 #include <linux/module.h>
  43 #include <linux/string.h>
  44 #include <linux/usb.h>
  45 #include <linux/usbdevice_fs.h>
  46 #include <linux/usb/hcd.h>      /* for usbcore internals */
  47 #include <linux/cdev.h>
  48 #include <linux/notifier.h>
  49 #include <linux/security.h>
  50 #include <linux/user_namespace.h>
  51 #include <linux/scatterlist.h>
  52 #include <linux/uaccess.h>
  53 #include <asm/byteorder.h>
  54 #include <linux/moduleparam.h>
  55
  56 #include "usb.h"
  57
  58 #define USB_MAXBUS                      64
  59 #define USB_DEVICE_MAX                  (USB_MAXBUS * 128)
  60 #define USB_SG_SIZE                     16384 /* split-size for large txs */
  61
  62 /* Mutual exclusion for removal, open, and release */
  63 DEFINE_MUTEX(usbfs_mutex);
  64
  65 struct usb_dev_state {
  66         struct list_head list;      /* state list */
  67         struct usb_device *dev;
  68         struct file *file;
  69         spinlock_t lock;            /* protects the async urb lists */
  70         struct list_head async_pending;
  71         struct list_head async_completed;
  72         wait_queue_head_t wait;     /* wake up if a request completed */
  73         unsigned int discsignr;
  74         struct pid *disc_pid;
  75         const struct cred *cred;
  76         void __user *disccontext;
  77         unsigned long ifclaimed;
  78         u32 secid;
  79         u32 disabled_bulk_eps;
  80 };
  81
  82 struct async {
  83         struct list_head asynclist;
  84         struct usb_dev_state *ps;
  85         struct pid *pid;
  86         const struct cred *cred;
  87         unsigned int signr;
  88         unsigned int ifnum;
  89         void __user *userbuffer;
  90         void __user *userurb;
  91         struct urb *urb;
  92         unsigned int mem_usage;
  93         int status;
  94         u32 secid;
  95         u8 bulk_addr;
  96         u8 bulk_status;
  97 };
  98
  99 static bool usbfs_snoop;
 100 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
 101 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
 102
 103 #define snoop(dev, format, arg...)                              \
 104         do {                                                    \
 105                 if (usbfs_snoop)                                \
 106                         dev_info(dev, format, ## arg);          \
 107         } while (0)
 108
 109 enum snoop_when {
 110         SUBMIT, COMPLETE
 111 };
 112
 113 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 114
 115 /* Limit on the total amount of memory we can allocate for transfers */
 116 static unsigned usbfs_memory_mb = 16;
 117 module_param(usbfs_memory_mb, uint, 0644);
 118 MODULE_PARM_DESC(usbfs_memory_mb,
 119                 "maximum MB allowed for usbfs buffers (0 = no limit)");
 120
 121 /* Hard limit, necessary to avoid arithmetic overflow */
 122 #define USBFS_XFER_MAX          (UINT_MAX / 2 - 1000000)
 123
 124 static atomic_t usbfs_memory_usage;     /* Total memory currently allocated */
 125
 126 /* Check whether it's okay to allocate more memory for a transfer */
 127 static int usbfs_increase_memory_usage(unsigned amount)
 128 {
 129         unsigned lim;
 130
 131         /*
 132          * Convert usbfs_memory_mb to bytes, avoiding overflows.
 133          * 0 means use the hard limit (effectively unlimited).
 134          */
 135         lim = ACCESS_ONCE(usbfs_memory_mb);
 136         if (lim == 0 || lim > (USBFS_XFER_MAX >> 20))
 137                 lim = USBFS_XFER_MAX;
 138         else
 139                 lim <<= 20;
 140
 141         atomic_add(amount, &usbfs_memory_usage);
 142         if (atomic_read(&usbfs_memory_usage) <= lim)
 143                 return 0;
 144         atomic_sub(amount, &usbfs_memory_usage);
 145         return -ENOMEM;
 146 }
 147
 148 /* Memory for a transfer is being deallocated */
 149 static void usbfs_decrease_memory_usage(unsigned amount)
 150 {
 151         atomic_sub(amount, &usbfs_memory_usage);
 152 }
 153
 154 static int connected(struct usb_dev_state *ps)
 155 {
 156         return (!list_empty(&ps->list) &&
 157                         ps->dev->state != USB_STATE_NOTATTACHED);
 158 }
 159
 160 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 161 {
 162         loff_t ret;
 163
 164         mutex_lock(&file_inode(file)->i_mutex);
 165
 166         switch (orig) {
 167         case 0:
 168                 file->f_pos = offset;
 169                 ret = file->f_pos;
 170                 break;
 171         case 1:
 172                 file->f_pos += offset;
 173                 ret = file->f_pos;
 174                 break;
 175         case 2:
 176         default:
 177                 ret = -EINVAL;
 178         }
 179
 180         mutex_unlock(&file_inode(file)->i_mutex);
 181         return ret;
 182 }
 183
 184 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 185                            loff_t *ppos)
 186 {
 187         struct usb_dev_state *ps = file->private_data;
 188         struct usb_device *dev = ps->dev;
 189         ssize_t ret = 0;
 190         unsigned len;
 191         loff_t pos;
 192         int i;
 193
 194         pos = *ppos;
 195         usb_lock_device(dev);
 196         if (!connected(ps)) {
 197                 ret = -ENODEV;
 198                 goto err;
 199         } else if (pos < 0) {
 200                 ret = -EINVAL;
 201                 goto err;
 202         }
 203
 204         if (pos < sizeof(struct usb_device_descriptor)) {
 205                 /* 18 bytes - fits on the stack */
 206                 struct usb_device_descriptor temp_desc;
 207
 208                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 209                 le16_to_cpus(&temp_desc.bcdUSB);
 210                 le16_to_cpus(&temp_desc.idVendor);
 211                 le16_to_cpus(&temp_desc.idProduct);
 212                 le16_to_cpus(&temp_desc.bcdDevice);
 213
 214                 len = sizeof(struct usb_device_descriptor) - pos;
 215                 if (len > nbytes)
 216                         len = nbytes;
 217                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 218                         ret = -EFAULT;
 219                         goto err;
 220                 }
 221
 222                 *ppos += len;
 223                 buf += len;
 224                 nbytes -= len;
 225                 ret += len;
 226         }
 227
 228         pos = sizeof(struct usb_device_descriptor);
 229         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 230                 struct usb_config_descriptor *config =
 231                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 232                 unsigned int length = le16_to_cpu(config->wTotalLength);
 233
 234                 if (*ppos < pos + length) {
 235
 236                         /* The descriptor may claim to be longer than it
 237                          * really is.  Here is the actual allocated length. */
 238                         unsigned alloclen =
 239                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 240
 241                         len = length - (*ppos - pos);
 242                         if (len > nbytes)
 243                                 len = nbytes;
 244
 245                         /* Simply don't write (skip over) unallocated parts */
 246                         if (alloclen > (*ppos - pos)) {
 247                                 alloclen -= (*ppos - pos);
 248                                 if (copy_to_user(buf,
 249                                     dev->rawdescriptors[i] + (*ppos - pos),
 250                                     min(len, alloclen))) {
 251                                         ret = -EFAULT;
 252                                         goto err;
 253                                 }
 254                         }
 255
 256                         *ppos += len;
 257                         buf += len;
 258                         nbytes -= len;
 259                         ret += len;
 260                 }
 261
 262                 pos += length;
 263         }
 264
 265 err:
 266         usb_unlock_device(dev);
 267         return ret;
 268 }
 269
 270 /*
 271  * async list handling
 272  */
 273
 274 static struct async *alloc_async(unsigned int numisoframes)
 275 {
 276         struct async *as;
 277
 278         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 279         if (!as)
 280                 return NULL;
 281         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 282         if (!as->urb) {
 283                 kfree(as);
 284                 return NULL;
 285         }
 286         return as;
 287 }
 288
 289 static void free_async(struct async *as)
 290 {
 291         int i;
 292
 293         put_pid(as->pid);
 294         if (as->cred)
 295                 put_cred(as->cred);
 296         for (i = 0; i < as->urb->num_sgs; i++) {
 297                 if (sg_page(&as->urb->sg[i]))
 298                         kfree(sg_virt(&as->urb->sg[i]));
 299         }
 300         kfree(as->urb->sg);
 301         kfree(as->urb->transfer_buffer);
 302         kfree(as->urb->setup_packet);
 303         usb_free_urb(as->urb);
 304         usbfs_decrease_memory_usage(as->mem_usage);
 305         kfree(as);
 306 }
 307
 308 static void async_newpending(struct async *as)
 309 {
 310         struct usb_dev_state *ps = as->ps;
 311         unsigned long flags;
 312
 313         spin_lock_irqsave(&ps->lock, flags);
 314         list_add_tail(&as->asynclist, &ps->async_pending);
 315         spin_unlock_irqrestore(&ps->lock, flags);
 316 }
 317
 318 static void async_removepending(struct async *as)
 319 {
 320         struct usb_dev_state *ps = as->ps;
 321         unsigned long flags;
 322
 323         spin_lock_irqsave(&ps->lock, flags);
 324         list_del_init(&as->asynclist);
 325         spin_unlock_irqrestore(&ps->lock, flags);
 326 }
 327
 328 static struct async *async_getcompleted(struct usb_dev_state *ps)
 329 {
 330         unsigned long flags;
 331         struct async *as = NULL;
 332
 333         spin_lock_irqsave(&ps->lock, flags);
 334         if (!list_empty(&ps->async_completed)) {
 335                 as = list_entry(ps->async_completed.next, struct async,
 336                                 asynclist);
 337                 list_del_init(&as->asynclist);
 338         }
 339         spin_unlock_irqrestore(&ps->lock, flags);
 340         return as;
 341 }
 342
 343 static struct async *async_getpending(struct usb_dev_state *ps,
 344                                              void __user *userurb)
 345 {
 346         struct async *as;
 347
 348         list_for_each_entry(as, &ps->async_pending, asynclist)
 349                 if (as->userurb == userurb) {
 350                         list_del_init(&as->asynclist);
 351                         return as;
 352                 }
 353
 354         return NULL;
 355 }
 356
 357 static void snoop_urb(struct usb_device *udev,
 358                 void __user *userurb, int pipe, unsigned length,
 359                 int timeout_or_status, enum snoop_when when,
 360                 unsigned char *data, unsigned data_len)
 361 {
 362         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 363         static const char *dirs[] = {"out", "in"};
 364         int ep;
 365         const char *t, *d;
 366
 367         if (!usbfs_snoop)
 368                 return;
 369
 370         ep = usb_pipeendpoint(pipe);
 371         t = types[usb_pipetype(pipe)];
 372         d = dirs[!!usb_pipein(pipe)];
 373
 374         if (userurb) {          /* Async */
 375                 if (when == SUBMIT)
 376                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 377                                         "length %u\n",
 378                                         userurb, ep, t, d, length);
 379                 else
 380                         dev_info(&udev->dev, "userurb %p, ep%d %s-%s, "
 381                                         "actual_length %u status %d\n",
 382                                         userurb, ep, t, d, length,
 383                                         timeout_or_status);
 384         } else {
 385                 if (when == SUBMIT)
 386                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 387                                         "timeout %d\n",
 388                                         ep, t, d, length, timeout_or_status);
 389                 else
 390                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 391                                         "status %d\n",
 392                                         ep, t, d, length, timeout_or_status);
 393         }
 394
 395         if (data && data_len > 0) {
 396                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 397                         data, data_len, 1);
 398         }
 399 }
 400
 401 static void snoop_urb_data(struct urb *urb, unsigned len)
 402 {
 403         int i, size;
 404
 405         if (!usbfs_snoop)
 406                 return;
 407
 408         if (urb->num_sgs == 0) {
 409                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 410                         urb->transfer_buffer, len, 1);
 411                 return;
 412         }
 413
 414         for (i = 0; i < urb->num_sgs && len; i++) {
 415                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 416                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 417                         sg_virt(&urb->sg[i]), size, 1);
 418                 len -= size;
 419         }
 420 }
 421
 422 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
 423 {
 424         unsigned i, len, size;
 425
 426         if (urb->number_of_packets > 0)         /* Isochronous */
 427                 len = urb->transfer_buffer_length;
 428         else                                    /* Non-Isoc */
 429                 len = urb->actual_length;
 430
 431         if (urb->num_sgs == 0) {
 432                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
 433                         return -EFAULT;
 434                 return 0;
 435         }
 436
 437         for (i = 0; i < urb->num_sgs && len; i++) {
 438                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 439                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
 440                         return -EFAULT;
 441                 userbuffer += size;
 442                 len -= size;
 443         }
 444
 445         return 0;
 446 }
 447
 448 #define AS_CONTINUATION 1
 449 #define AS_UNLINK       2
 450
 451 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
 452 __releases(ps->lock)
 453 __acquires(ps->lock)
 454 {
 455         struct urb *urb;
 456         struct async *as;
 457
 458         /* Mark all the pending URBs that match bulk_addr, up to but not
 459          * including the first one without AS_CONTINUATION.  If such an
 460          * URB is encountered then a new transfer has already started so
 461          * the endpoint doesn't need to be disabled; otherwise it does.
 462          */
 463         list_for_each_entry(as, &ps->async_pending, asynclist) {
 464                 if (as->bulk_addr == bulk_addr) {
 465                         if (as->bulk_status != AS_CONTINUATION)
 466                                 goto rescan;
 467                         as->bulk_status = AS_UNLINK;
 468                         as->bulk_addr = 0;
 469                 }
 470         }
 471         ps->disabled_bulk_eps |= (1 << bulk_addr);
 472
 473         /* Now carefully unlink all the marked pending URBs */
 474  rescan:
 475         list_for_each_entry(as, &ps->async_pending, asynclist) {
 476                 if (as->bulk_status == AS_UNLINK) {
 477                         as->bulk_status = 0;            /* Only once */
 478                         urb = as->urb;
 479                         usb_get_urb(urb);
 480                         spin_unlock(&ps->lock);         /* Allow completions */
 481                         usb_unlink_urb(urb);
 482                         usb_put_urb(urb);
 483                         spin_lock(&ps->lock);
 484                         goto rescan;
 485                 }
 486         }
 487 }
 488
 489 static void async_completed(struct urb *urb)
 490 {
 491         struct async *as = urb->context;
 492         struct usb_dev_state *ps = as->ps;
 493         struct siginfo sinfo;
 494         struct pid *pid = NULL;
 495         u32 secid = 0;
 496         const struct cred *cred = NULL;
 497         int signr;
 498
 499         spin_lock(&ps->lock);
 500         list_move_tail(&as->asynclist, &ps->async_completed);
 501         as->status = urb->status;
 502         signr = as->signr;
 503         if (signr) {
 504                 memset(&sinfo, 0, sizeof(sinfo));
 505                 sinfo.si_signo = as->signr;
 506                 sinfo.si_errno = as->status;
 507                 sinfo.si_code = SI_ASYNCIO;
 508                 sinfo.si_addr = as->userurb;
 509                 pid = get_pid(as->pid);
 510                 cred = get_cred(as->cred);
 511                 secid = as->secid;
 512         }
 513         snoop(&urb->dev->dev, "urb complete\n");
 514         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 515                         as->status, COMPLETE, NULL, 0);
 516         if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
 517                 snoop_urb_data(urb, urb->actual_length);
 518
 519         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 520                         as->status != -ENOENT)
 521                 cancel_bulk_urbs(ps, as->bulk_addr);
 522         spin_unlock(&ps->lock);
 523
 524         if (signr) {
 525                 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
 526                 put_pid(pid);
 527                 put_cred(cred);
 528         }
 529
 530         wake_up(&ps->wait);
 531 }
 532
 533 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
 534 {
 535         struct urb *urb;
 536         struct async *as;
 537         unsigned long flags;
 538
 539         spin_lock_irqsave(&ps->lock, flags);
 540         while (!list_empty(list)) {
 541                 as = list_entry(list->next, struct async, asynclist);
 542                 list_del_init(&as->asynclist);
 543                 urb = as->urb;
 544                 usb_get_urb(urb);
 545
 546                 /* drop the spinlock so the completion handler can run */
 547                 spin_unlock_irqrestore(&ps->lock, flags);
 548                 usb_kill_urb(urb);
 549                 usb_put_urb(urb);
 550                 spin_lock_irqsave(&ps->lock, flags);
 551         }
 552         spin_unlock_irqrestore(&ps->lock, flags);
 553 }
 554
 555 static void destroy_async_on_interface(struct usb_dev_state *ps,
 556                                        unsigned int ifnum)
 557 {
 558         struct list_head *p, *q, hitlist;
 559         unsigned long flags;
 560
 561         INIT_LIST_HEAD(&hitlist);
 562         spin_lock_irqsave(&ps->lock, flags);
 563         list_for_each_safe(p, q, &ps->async_pending)
 564                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 565                         list_move_tail(p, &hitlist);
 566         spin_unlock_irqrestore(&ps->lock, flags);
 567         destroy_async(ps, &hitlist);
 568 }
 569
 570 static void destroy_all_async(struct usb_dev_state *ps)
 571 {
 572         destroy_async(ps, &ps->async_pending);
 573 }
 574
 575 /*
 576  * interface claims are made only at the request of user level code,
 577  * which can also release them (explicitly or by closing files).
 578  * they're also undone when devices disconnect.
 579  */
 580
 581 static int driver_probe(struct usb_interface *intf,
 582                         const struct usb_device_id *id)
 583 {
 584         return -ENODEV;
 585 }
 586
 587 static void driver_disconnect(struct usb_interface *intf)
 588 {
 589         struct usb_dev_state *ps = usb_get_intfdata(intf);
 590         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 591
 592         if (!ps)
 593                 return;
 594
 595         /* NOTE:  this relies on usbcore having canceled and completed
 596          * all pending I/O requests; 2.6 does that.
 597          */
 598
 599         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 600                 clear_bit(ifnum, &ps->ifclaimed);
 601         else
 602                 dev_warn(&intf->dev, "interface number %u out of range\n",
 603                          ifnum);
 604
 605         usb_set_intfdata(intf, NULL);
 606
 607         /* force async requests to complete */
 608         destroy_async_on_interface(ps, ifnum);
 609 }
 610
 611 /* The following routines are merely placeholders.  There is no way
 612  * to inform a user task about suspend or resumes.
 613  */
 614 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 615 {
 616         return 0;
 617 }
 618
 619 static int driver_resume(struct usb_interface *intf)
 620 {
 621         return 0;
 622 }
 623
 624 struct usb_driver usbfs_driver = {
 625         .name =         "usbfs",
 626         .probe =        driver_probe,
 627         .disconnect =   driver_disconnect,
 628         .suspend =      driver_suspend,
 629         .resume =       driver_resume,
 630 };
 631
 632 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
 633 {
 634         struct usb_device *dev = ps->dev;
 635         struct usb_interface *intf;
 636         int err;
 637
 638         if (ifnum >= 8*sizeof(ps->ifclaimed))
 639                 return -EINVAL;
 640         /* already claimed */
 641         if (test_bit(ifnum, &ps->ifclaimed))
 642                 return 0;
 643
 644         intf = usb_ifnum_to_if(dev, ifnum);
 645         if (!intf)
 646                 err = -ENOENT;
 647         else
 648                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 649         if (err == 0)
 650                 set_bit(ifnum, &ps->ifclaimed);
 651         return err;
 652 }
 653
 654 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
 655 {
 656         struct usb_device *dev;
 657         struct usb_interface *intf;
 658         int err;
 659
 660         err = -EINVAL;
 661         if (ifnum >= 8*sizeof(ps->ifclaimed))
 662                 return err;
 663         dev = ps->dev;
 664         intf = usb_ifnum_to_if(dev, ifnum);
 665         if (!intf)
 666                 err = -ENOENT;
 667         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 668                 usb_driver_release_interface(&usbfs_driver, intf);
 669                 err = 0;
 670         }
 671         return err;
 672 }
 673
 674 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
 675 {
 676         if (ps->dev->state != USB_STATE_CONFIGURED)
 677                 return -EHOSTUNREACH;
 678         if (ifnum >= 8*sizeof(ps->ifclaimed))
 679                 return -EINVAL;
 680         if (test_bit(ifnum, &ps->ifclaimed))
 681                 return 0;
 682         /* if not yet claimed, claim it for the driver */
 683         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 684                  "interface %u before use\n", task_pid_nr(current),
 685                  current->comm, ifnum);
 686         return claimintf(ps, ifnum);
 687 }
 688
 689 static int findintfep(struct usb_device *dev, unsigned int ep)
 690 {
 691         unsigned int i, j, e;
 692         struct usb_interface *intf;
 693         struct usb_host_interface *alts;
 694         struct usb_endpoint_descriptor *endpt;
 695
 696         if (ep & ~(USB_DIR_IN|0xf))
 697                 return -EINVAL;
 698         if (!dev->actconfig)
 699                 return -ESRCH;
 700         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 701                 intf = dev->actconfig->interface[i];
 702                 for (j = 0; j < intf->num_altsetting; j++) {
 703                         alts = &intf->altsetting[j];
 704                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 705                                 endpt = &alts->endpoint[e].desc;
 706                                 if (endpt->bEndpointAddress == ep)
 707                                         return alts->desc.bInterfaceNumber;
 708                         }
 709                 }
 710         }
 711         return -ENOENT;
 712 }
 713
 714 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
 715                            unsigned int request, unsigned int index)
 716 {
 717         int ret = 0;
 718         struct usb_host_interface *alt_setting;
 719
 720         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 721          && ps->dev->state != USB_STATE_ADDRESS
 722          && ps->dev->state != USB_STATE_CONFIGURED)
 723                 return -EHOSTUNREACH;
 724         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 725                 return 0;
 726
 727         /*
 728          * check for the special corner case 'get_device_id' in the printer
 729          * class specification, which we always want to allow as it is used
 730          * to query things like ink level, etc.
 731          */
 732         if (requesttype == 0xa1 && request == 0) {
 733                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 734                                                    index >> 8, index & 0xff);
 735                 if (alt_setting
 736                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 737                         return 0;
 738         }
 739
 740         index &= 0xff;
 741         switch (requesttype & USB_RECIP_MASK) {
 742         case USB_RECIP_ENDPOINT:
 743                 if ((index & ~USB_DIR_IN) == 0)
 744                         return 0;
 745                 ret = findintfep(ps->dev, index);
 746                 if (ret < 0) {
 747                         /*
 748                          * Some not fully compliant Win apps seem to get
 749                          * index wrong and have the endpoint number here
 750                          * rather than the endpoint address (with the
 751                          * correct direction). Win does let this through,
 752                          * so we'll not reject it here but leave it to
 753                          * the device to not break KVM. But we warn.
 754                          */
 755                         ret = findintfep(ps->dev, index ^ 0x80);
 756                         if (ret >= 0)
 757                                 dev_info(&ps->dev->dev,
 758                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 759                                         __func__, task_pid_nr(current),
 760                                         current->comm, index, index ^ 0x80);
 761                 }
 762                 if (ret >= 0)
 763                         ret = checkintf(ps, ret);
 764                 break;
 765
 766         case USB_RECIP_INTERFACE:
 767                 ret = checkintf(ps, index);
 768                 break;
 769         }
 770         return ret;
 771 }
 772
 773 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
 774                                                      unsigned char ep)
 775 {
 776         if (ep & USB_ENDPOINT_DIR_MASK)
 777                 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
 778         else
 779                 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
 780 }
 781
 782 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
 783                                   struct usbdevfs_streams __user *streams,
 784                                   unsigned int *num_streams_ret,
 785                                   unsigned int *num_eps_ret,
 786                                   struct usb_host_endpoint ***eps_ret,
 787                                   struct usb_interface **intf_ret)
 788 {
 789         unsigned int i, num_streams, num_eps;
 790         struct usb_host_endpoint **eps;
 791         struct usb_interface *intf = NULL;
 792         unsigned char ep;
 793         int ifnum, ret;
 794
 795         if (get_user(num_streams, &streams->num_streams) ||
 796             get_user(num_eps, &streams->num_eps))
 797                 return -EFAULT;
 798
 799         if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
 800                 return -EINVAL;
 801
 802         /* The XHCI controller allows max 2 ^ 16 streams */
 803         if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
 804                 return -EINVAL;
 805
 806         eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
 807         if (!eps)
 808                 return -ENOMEM;
 809
 810         for (i = 0; i < num_eps; i++) {
 811                 if (get_user(ep, &streams->eps[i])) {
 812                         ret = -EFAULT;
 813                         goto error;
 814                 }
 815                 eps[i] = ep_to_host_endpoint(ps->dev, ep);
 816                 if (!eps[i]) {
 817                         ret = -EINVAL;
 818                         goto error;
 819                 }
 820
 821                 /* usb_alloc/free_streams operate on an usb_interface */
 822                 ifnum = findintfep(ps->dev, ep);
 823                 if (ifnum < 0) {
 824                         ret = ifnum;
 825                         goto error;
 826                 }
 827
 828                 if (i == 0) {
 829                         ret = checkintf(ps, ifnum);
 830                         if (ret < 0)
 831                                 goto error;
 832                         intf = usb_ifnum_to_if(ps->dev, ifnum);
 833                 } else {
 834                         /* Verify all eps belong to the same interface */
 835                         if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
 836                                 ret = -EINVAL;
 837                                 goto error;
 838                         }
 839                 }
 840         }
 841
 842         if (num_streams_ret)
 843                 *num_streams_ret = num_streams;
 844         *num_eps_ret = num_eps;
 845         *eps_ret = eps;
 846         *intf_ret = intf;
 847
 848         return 0;
 849
 850 error:
 851         kfree(eps);
 852         return ret;
 853 }
 854
 855 static int match_devt(struct device *dev, void *data)
 856 {
 857         return dev->devt == (dev_t) (unsigned long) data;
 858 }
 859
 860 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 861 {
 862         struct device *dev;
 863
 864         dev = bus_find_device(&usb_bus_type, NULL,
 865                               (void *) (unsigned long) devt, match_devt);
 866         if (!dev)
 867                 return NULL;
 868         return container_of(dev, struct usb_device, dev);
 869 }
 870
 871 /*
 872  * file operations
 873  */
 874 static int usbdev_open(struct inode *inode, struct file *file)
 875 {
 876         struct usb_device *dev = NULL;
 877         struct usb_dev_state *ps;
 878         int ret;
 879
 880         ret = -ENOMEM;
 881         ps = kmalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
 882         if (!ps)
 883                 goto out_free_ps;
 884
 885         ret = -ENODEV;
 886
 887         /* Protect against simultaneous removal or release */
 888         mutex_lock(&usbfs_mutex);
 889
 890         /* usbdev device-node */
 891         if (imajor(inode) == USB_DEVICE_MAJOR)
 892                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 893
 894         mutex_unlock(&usbfs_mutex);
 895
 896         if (!dev)
 897                 goto out_free_ps;
 898
 899         usb_lock_device(dev);
 900         if (dev->state == USB_STATE_NOTATTACHED)
 901                 goto out_unlock_device;
 902
 903         ret = usb_autoresume_device(dev);
 904         if (ret)
 905                 goto out_unlock_device;
 906
 907         ps->dev = dev;
 908         ps->file = file;
 909         spin_lock_init(&ps->lock);
 910         INIT_LIST_HEAD(&ps->list);
 911         INIT_LIST_HEAD(&ps->async_pending);
 912         INIT_LIST_HEAD(&ps->async_completed);
 913         init_waitqueue_head(&ps->wait);
 914         ps->discsignr = 0;
 915         ps->disc_pid = get_pid(task_pid(current));
 916         ps->cred = get_current_cred();
 917         ps->disccontext = NULL;
 918         ps->ifclaimed = 0;
 919         security_task_getsecid(current, &ps->secid);
 920         smp_wmb();
 921         list_add_tail(&ps->list, &dev->filelist);
 922         file->private_data = ps;
 923         usb_unlock_device(dev);
 924         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 925                         current->comm);
 926         return ret;
 927
 928  out_unlock_device:
 929         usb_unlock_device(dev);
 930         usb_put_dev(dev);
 931  out_free_ps:
 932         kfree(ps);
 933         return ret;
 934 }
 935
 936 static int usbdev_release(struct inode *inode, struct file *file)
 937 {
 938         struct usb_dev_state *ps = file->private_data;
 939         struct usb_device *dev = ps->dev;
 940         unsigned int ifnum;
 941         struct async *as;
 942
 943         usb_lock_device(dev);
 944         usb_hub_release_all_ports(dev, ps);
 945
 946         list_del_init(&ps->list);
 947
 948         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 949                         ifnum++) {
 950                 if (test_bit(ifnum, &ps->ifclaimed))
 951                         releaseintf(ps, ifnum);
 952         }
 953         destroy_all_async(ps);
 954         usb_autosuspend_device(dev);
 955         usb_unlock_device(dev);
 956         usb_put_dev(dev);
 957         put_pid(ps->disc_pid);
 958         put_cred(ps->cred);
 959
 960         as = async_getcompleted(ps);
 961         while (as) {
 962                 free_async(as);
 963                 as = async_getcompleted(ps);
 964         }
 965         kfree(ps);
 966         return 0;
 967 }
 968
 969 static int proc_control(struct usb_dev_state *ps, void __user *arg)
 970 {
 971         struct usb_device *dev = ps->dev;
 972         struct usbdevfs_ctrltransfer ctrl;
 973         unsigned int tmo;
 974         unsigned char *tbuf;
 975         unsigned wLength;
 976         int i, pipe, ret;
 977
 978         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 979                 return -EFAULT;
 980         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
 981                               ctrl.wIndex);
 982         if (ret)
 983                 return ret;
 984         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 985         if (wLength > PAGE_SIZE)
 986                 return -EINVAL;
 987         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
 988                         sizeof(struct usb_ctrlrequest));
 989         if (ret)
 990                 return ret;
 991         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 992         if (!tbuf) {
 993                 ret = -ENOMEM;
 994                 goto done;
 995         }
 996         tmo = ctrl.timeout;
 997         snoop(&dev->dev, "control urb: bRequestType=%02x "
 998                 "bRequest=%02x wValue=%04x "
 999                 "wIndex=%04x wLength=%04x\n",
1000                 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1001                 ctrl.wIndex, ctrl.wLength);
1002         if (ctrl.bRequestType & 0x80) {
1003                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1004                                                ctrl.wLength)) {
1005                         ret = -EINVAL;
1006                         goto done;
1007                 }
1008                 pipe = usb_rcvctrlpipe(dev, 0);
1009                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1010
1011                 usb_unlock_device(dev);
1012                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1013                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1014                                     tbuf, ctrl.wLength, tmo);
1015                 usb_lock_device(dev);
1016                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1017                           tbuf, max(i, 0));
1018                 if ((i > 0) && ctrl.wLength) {
1019                         if (copy_to_user(ctrl.data, tbuf, i)) {
1020                                 ret = -EFAULT;
1021                                 goto done;
1022                         }
1023                 }
1024         } else {
1025                 if (ctrl.wLength) {
1026                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1027                                 ret = -EFAULT;
1028                                 goto done;
1029                         }
1030                 }
1031                 pipe = usb_sndctrlpipe(dev, 0);
1032                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1033                         tbuf, ctrl.wLength);
1034
1035                 usb_unlock_device(dev);
1036                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1037                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1038                                     tbuf, ctrl.wLength, tmo);
1039                 usb_lock_device(dev);
1040                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1041         }
1042         if (i < 0 && i != -EPIPE) {
1043                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1044                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
1045                            current->comm, ctrl.bRequestType, ctrl.bRequest,
1046                            ctrl.wLength, i);
1047         }
1048         ret = i;
1049  done:
1050         free_page((unsigned long) tbuf);
1051         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1052                         sizeof(struct usb_ctrlrequest));
1053         return ret;
1054 }
1055
1056 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1057 {
1058         struct usb_device *dev = ps->dev;
1059         struct usbdevfs_bulktransfer bulk;
1060         unsigned int tmo, len1, pipe;
1061         int len2;
1062         unsigned char *tbuf;
1063         int i, ret;
1064
1065         if (copy_from_user(&bulk, arg, sizeof(bulk)))
1066                 return -EFAULT;
1067         ret = findintfep(ps->dev, bulk.ep);
1068         if (ret < 0)
1069                 return ret;
1070         ret = checkintf(ps, ret);
1071         if (ret)
1072                 return ret;
1073         if (bulk.ep & USB_DIR_IN)
1074                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1075         else
1076                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1077         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1078                 return -EINVAL;
1079         len1 = bulk.len;
1080         if (len1 >= USBFS_XFER_MAX)
1081                 return -EINVAL;
1082         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1083         if (ret)
1084                 return ret;
1085         tbuf = kmalloc(len1, GFP_KERNEL);
1086         if (!tbuf) {
1087                 ret = -ENOMEM;
1088                 goto done;
1089         }
1090         tmo = bulk.timeout;
1091         if (bulk.ep & 0x80) {
1092                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1093                         ret = -EINVAL;
1094                         goto done;
1095                 }
1096                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1097
1098                 usb_unlock_device(dev);
1099                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1100                 usb_lock_device(dev);
1101                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1102
1103                 if (!i && len2) {
1104                         if (copy_to_user(bulk.data, tbuf, len2)) {
1105                                 ret = -EFAULT;
1106                                 goto done;
1107                         }
1108                 }
1109         } else {
1110                 if (len1) {
1111                         if (copy_from_user(tbuf, bulk.data, len1)) {
1112                                 ret = -EFAULT;
1113                                 goto done;
1114                         }
1115                 }
1116                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1117
1118                 usb_unlock_device(dev);
1119                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1120                 usb_lock_device(dev);
1121                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1122         }
1123         ret = (i < 0 ? i : len2);
1124  done:
1125         kfree(tbuf);
1126         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1127         return ret;
1128 }
1129
1130 static void check_reset_of_active_ep(struct usb_device *udev,
1131                 unsigned int epnum, char *ioctl_name)
1132 {
1133         struct usb_host_endpoint **eps;
1134         struct usb_host_endpoint *ep;
1135
1136         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1137         ep = eps[epnum & 0x0f];
1138         if (ep && !list_empty(&ep->urb_list))
1139                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1140                                 task_pid_nr(current), current->comm,
1141                                 ioctl_name, epnum);
1142 }
1143
1144 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1145 {
1146         unsigned int ep;
1147         int ret;
1148
1149         if (get_user(ep, (unsigned int __user *)arg))
1150                 return -EFAULT;
1151         ret = findintfep(ps->dev, ep);
1152         if (ret < 0)
1153                 return ret;
1154         ret = checkintf(ps, ret);
1155         if (ret)
1156                 return ret;
1157         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1158         usb_reset_endpoint(ps->dev, ep);
1159         return 0;
1160 }
1161
1162 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1163 {
1164         unsigned int ep;
1165         int pipe;
1166         int ret;
1167
1168         if (get_user(ep, (unsigned int __user *)arg))
1169                 return -EFAULT;
1170         ret = findintfep(ps->dev, ep);
1171         if (ret < 0)
1172                 return ret;
1173         ret = checkintf(ps, ret);
1174         if (ret)
1175                 return ret;
1176         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1177         if (ep & USB_DIR_IN)
1178                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1179         else
1180                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1181
1182         return usb_clear_halt(ps->dev, pipe);
1183 }
1184
1185 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1186 {
1187         struct usbdevfs_getdriver gd;
1188         struct usb_interface *intf;
1189         int ret;
1190
1191         if (copy_from_user(&gd, arg, sizeof(gd)))
1192                 return -EFAULT;
1193         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1194         if (!intf || !intf->dev.driver)
1195                 ret = -ENODATA;
1196         else {
1197                 strlcpy(gd.driver, intf->dev.driver->name,
1198                                 sizeof(gd.driver));
1199                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1200         }
1201         return ret;
1202 }
1203
1204 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1205 {
1206         struct usbdevfs_connectinfo ci = {
1207                 .devnum = ps->dev->devnum,
1208                 .slow = ps->dev->speed == USB_SPEED_LOW
1209         };
1210
1211         if (copy_to_user(arg, &ci, sizeof(ci)))
1212                 return -EFAULT;
1213         return 0;
1214 }
1215
1216 static int proc_resetdevice(struct usb_dev_state *ps)
1217 {
1218         return usb_reset_device(ps->dev);
1219 }
1220
1221 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1222 {
1223         struct usbdevfs_setinterface setintf;
1224         int ret;
1225
1226         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1227                 return -EFAULT;
1228         ret = checkintf(ps, setintf.interface);
1229         if (ret)
1230                 return ret;
1231
1232         destroy_async_on_interface(ps, setintf.interface);
1233
1234         return usb_set_interface(ps->dev, setintf.interface,
1235                         setintf.altsetting);
1236 }
1237
1238 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1239 {
1240         int u;
1241         int status = 0;
1242         struct usb_host_config *actconfig;
1243
1244         if (get_user(u, (int __user *)arg))
1245                 return -EFAULT;
1246
1247         actconfig = ps->dev->actconfig;
1248
1249         /* Don't touch the device if any interfaces are claimed.
1250          * It could interfere with other drivers' operations, and if
1251          * an interface is claimed by usbfs it could easily deadlock.
1252          */
1253         if (actconfig) {
1254                 int i;
1255
1256                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1257                         if (usb_interface_claimed(actconfig->interface[i])) {
1258                                 dev_warn(&ps->dev->dev,
1259                                         "usbfs: interface %d claimed by %s "
1260                                         "while '%s' sets config #%d\n",
1261                                         actconfig->interface[i]
1262                                                 ->cur_altsetting
1263                                                 ->desc.bInterfaceNumber,
1264                                         actconfig->interface[i]
1265                                                 ->dev.driver->name,
1266                                         current->comm, u);
1267                                 status = -EBUSY;
1268                                 break;
1269                         }
1270                 }
1271         }
1272
1273         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1274          * so avoid usb_set_configuration()'s kick to sysfs
1275          */
1276         if (status == 0) {
1277                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1278                         status = usb_reset_configuration(ps->dev);
1279                 else
1280                         status = usb_set_configuration(ps->dev, u);
1281         }
1282
1283         return status;
1284 }
1285
1286 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1287                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1288                         void __user *arg)
1289 {
1290         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1291         struct usb_host_endpoint *ep;
1292         struct async *as = NULL;
1293         struct usb_ctrlrequest *dr = NULL;
1294         unsigned int u, totlen, isofrmlen;
1295         int i, ret, is_in, num_sgs = 0, ifnum = -1;
1296         int number_of_packets = 0;
1297         unsigned int stream_id = 0;
1298         void *buf;
1299
1300         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1301                                 USBDEVFS_URB_SHORT_NOT_OK |
1302                                 USBDEVFS_URB_BULK_CONTINUATION |
1303                                 USBDEVFS_URB_NO_FSBR |
1304                                 USBDEVFS_URB_ZERO_PACKET |
1305                                 USBDEVFS_URB_NO_INTERRUPT))
1306                 return -EINVAL;
1307         if (uurb->buffer_length > 0 && !uurb->buffer)
1308                 return -EINVAL;
1309         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1310             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1311                 ifnum = findintfep(ps->dev, uurb->endpoint);
1312                 if (ifnum < 0)
1313                         return ifnum;
1314                 ret = checkintf(ps, ifnum);
1315                 if (ret)
1316                         return ret;
1317         }
1318         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1319         if (!ep)
1320                 return -ENOENT;
1321         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1322
1323         u = 0;
1324         switch (uurb->type) {
1325         case USBDEVFS_URB_TYPE_CONTROL:
1326                 if (!usb_endpoint_xfer_control(&ep->desc))
1327                         return -EINVAL;
1328                 /* min 8 byte setup packet */
1329                 if (uurb->buffer_length < 8)
1330                         return -EINVAL;
1331                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1332                 if (!dr)
1333                         return -ENOMEM;
1334                 if (copy_from_user(dr, uurb->buffer, 8)) {
1335                         ret = -EFAULT;
1336                         goto error;
1337                 }
1338                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1339                         ret = -EINVAL;
1340                         goto error;
1341                 }
1342                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1343                                       le16_to_cpup(&dr->wIndex));
1344                 if (ret)
1345                         goto error;
1346                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1347                 uurb->buffer += 8;
1348                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1349                         is_in = 1;
1350                         uurb->endpoint |= USB_DIR_IN;
1351                 } else {
1352                         is_in = 0;
1353                         uurb->endpoint &= ~USB_DIR_IN;
1354                 }
1355                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1356                         "bRequest=%02x wValue=%04x "
1357                         "wIndex=%04x wLength=%04x\n",
1358                         dr->bRequestType, dr->bRequest,
1359                         __le16_to_cpup(&dr->wValue),
1360                         __le16_to_cpup(&dr->wIndex),
1361                         __le16_to_cpup(&dr->wLength));
1362                 u = sizeof(struct usb_ctrlrequest);
1363                 break;
1364
1365         case USBDEVFS_URB_TYPE_BULK:
1366                 switch (usb_endpoint_type(&ep->desc)) {
1367                 case USB_ENDPOINT_XFER_CONTROL:
1368                 case USB_ENDPOINT_XFER_ISOC:
1369                         return -EINVAL;
1370                 case USB_ENDPOINT_XFER_INT:
1371                         /* allow single-shot interrupt transfers */
1372                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1373                         goto interrupt_urb;
1374                 }
1375                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1376                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1377                         num_sgs = 0;
1378                 if (ep->streams)
1379                         stream_id = uurb->stream_id;
1380                 break;
1381
1382         case USBDEVFS_URB_TYPE_INTERRUPT:
1383                 if (!usb_endpoint_xfer_int(&ep->desc))
1384                         return -EINVAL;
1385  interrupt_urb:
1386                 break;
1387
1388         case USBDEVFS_URB_TYPE_ISO:
1389                 /* arbitrary limit */
1390                 if (uurb->number_of_packets < 1 ||
1391                     uurb->number_of_packets > 128)
1392                         return -EINVAL;
1393                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1394                         return -EINVAL;
1395                 number_of_packets = uurb->number_of_packets;
1396                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1397                                    number_of_packets;
1398                 isopkt = kmalloc(isofrmlen, GFP_KERNEL);
1399                 if (!isopkt)
1400                         return -ENOMEM;
1401                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1402                         ret = -EFAULT;
1403                         goto error;
1404                 }
1405                 for (totlen = u = 0; u < number_of_packets; u++) {
1406                         /*
1407                          * arbitrary limit need for USB 3.0
1408                          * bMaxBurst (0~15 allowed, 1~16 packets)
1409                          * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1410                          * sizemax: 1024 * 16 * 3 = 49152
1411                          */
1412                         if (isopkt[u].length > 49152) {
1413                                 ret = -EINVAL;
1414                                 goto error;
1415                         }
1416                         totlen += isopkt[u].length;
1417                 }
1418                 u *= sizeof(struct usb_iso_packet_descriptor);
1419                 uurb->buffer_length = totlen;
1420                 break;
1421
1422         default:
1423                 return -EINVAL;
1424         }
1425
1426         if (uurb->buffer_length >= USBFS_XFER_MAX) {
1427                 ret = -EINVAL;
1428                 goto error;
1429         }
1430         if (uurb->buffer_length > 0 &&
1431                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1432                                 uurb->buffer, uurb->buffer_length)) {
1433                 ret = -EFAULT;
1434                 goto error;
1435         }
1436         as = alloc_async(number_of_packets);
1437         if (!as) {
1438                 ret = -ENOMEM;
1439                 goto error;
1440         }
1441
1442         u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1443              num_sgs * sizeof(struct scatterlist);
1444         ret = usbfs_increase_memory_usage(u);
1445         if (ret)
1446                 goto error;
1447         as->mem_usage = u;
1448
1449         if (num_sgs) {
1450                 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1451                                       GFP_KERNEL);
1452                 if (!as->urb->sg) {
1453                         ret = -ENOMEM;
1454                         goto error;
1455                 }
1456                 as->urb->num_sgs = num_sgs;
1457                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1458
1459                 totlen = uurb->buffer_length;
1460                 for (i = 0; i < as->urb->num_sgs; i++) {
1461                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1462                         buf = kmalloc(u, GFP_KERNEL);
1463                         if (!buf) {
1464                                 ret = -ENOMEM;
1465                                 goto error;
1466                         }
1467                         sg_set_buf(&as->urb->sg[i], buf, u);
1468
1469                         if (!is_in) {
1470                                 if (copy_from_user(buf, uurb->buffer, u)) {
1471                                         ret = -EFAULT;
1472                                         goto error;
1473                                 }
1474                                 uurb->buffer += u;
1475                         }
1476                         totlen -= u;
1477                 }
1478         } else if (uurb->buffer_length > 0) {
1479                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1480                                 GFP_KERNEL);
1481                 if (!as->urb->transfer_buffer) {
1482                         ret = -ENOMEM;
1483                         goto error;
1484                 }
1485
1486                 if (!is_in) {
1487                         if (copy_from_user(as->urb->transfer_buffer,
1488                                            uurb->buffer,
1489                                            uurb->buffer_length)) {
1490                                 ret = -EFAULT;
1491                                 goto error;
1492                         }
1493                 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1494                         /*
1495                          * Isochronous input data may end up being
1496                          * discontiguous if some of the packets are short.
1497                          * Clear the buffer so that the gaps don't leak
1498                          * kernel data to userspace.
1499                          */
1500                         memset(as->urb->transfer_buffer, 0,
1501                                         uurb->buffer_length);
1502                 }
1503         }
1504         as->urb->dev = ps->dev;
1505         as->urb->pipe = (uurb->type << 30) |
1506                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1507                         (uurb->endpoint & USB_DIR_IN);
1508
1509         /* This tedious sequence is necessary because the URB_* flags
1510          * are internal to the kernel and subject to change, whereas
1511          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1512          */
1513         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1514         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1515                 u |= URB_ISO_ASAP;
1516         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
1517                 u |= URB_SHORT_NOT_OK;
1518         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1519                 u |= URB_NO_FSBR;
1520         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1521                 u |= URB_ZERO_PACKET;
1522         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1523                 u |= URB_NO_INTERRUPT;
1524         as->urb->transfer_flags = u;
1525
1526         as->urb->transfer_buffer_length = uurb->buffer_length;
1527         as->urb->setup_packet = (unsigned char *)dr;
1528         dr = NULL;
1529         as->urb->start_frame = uurb->start_frame;
1530         as->urb->number_of_packets = number_of_packets;
1531         as->urb->stream_id = stream_id;
1532         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1533                         ps->dev->speed == USB_SPEED_HIGH)
1534                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1535         else
1536                 as->urb->interval = ep->desc.bInterval;
1537         as->urb->context = as;
1538         as->urb->complete = async_completed;
1539         for (totlen = u = 0; u < number_of_packets; u++) {
1540                 as->urb->iso_frame_desc[u].offset = totlen;
1541                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1542                 totlen += isopkt[u].length;
1543         }
1544         kfree(isopkt);
1545         isopkt = NULL;
1546         as->ps = ps;
1547         as->userurb = arg;
1548         if (is_in && uurb->buffer_length > 0)
1549                 as->userbuffer = uurb->buffer;
1550         else
1551                 as->userbuffer = NULL;
1552         as->signr = uurb->signr;
1553         as->ifnum = ifnum;
1554         as->pid = get_pid(task_pid(current));
1555         as->cred = get_current_cred();
1556         security_task_getsecid(current, &as->secid);
1557         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1558                         as->urb->transfer_buffer_length, 0, SUBMIT,
1559                         NULL, 0);
1560         if (!is_in)
1561                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1562
1563         async_newpending(as);
1564
1565         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1566                 spin_lock_irq(&ps->lock);
1567
1568                 /* Not exactly the endpoint address; the direction bit is
1569                  * shifted to the 0x10 position so that the value will be
1570                  * between 0 and 31.
1571                  */
1572                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1573                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1574                                 >> 3);
1575
1576                 /* If this bulk URB is the start of a new transfer, re-enable
1577                  * the endpoint.  Otherwise mark it as a continuation URB.
1578                  */
1579                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1580                         as->bulk_status = AS_CONTINUATION;
1581                 else
1582                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1583
1584                 /* Don't accept continuation URBs if the endpoint is
1585                  * disabled because of an earlier error.
1586                  */
1587                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1588                         ret = -EREMOTEIO;
1589                 else
1590                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1591                 spin_unlock_irq(&ps->lock);
1592         } else {
1593                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1594         }
1595
1596         if (ret) {
1597                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1598                            "usbfs: usb_submit_urb returned %d\n", ret);
1599                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1600                                 0, ret, COMPLETE, NULL, 0);
1601                 async_removepending(as);
1602                 goto error;
1603         }
1604         return 0;
1605
1606  error:
1607         kfree(isopkt);
1608         kfree(dr);
1609         if (as)
1610                 free_async(as);
1611         return ret;
1612 }
1613
1614 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1615 {
1616         struct usbdevfs_urb uurb;
1617
1618         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1619                 return -EFAULT;
1620
1621         return proc_do_submiturb(ps, &uurb,
1622                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1623                         arg);
1624 }
1625
1626 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1627 {
1628         struct urb *urb;
1629         struct async *as;
1630         unsigned long flags;
1631
1632         spin_lock_irqsave(&ps->lock, flags);
1633         as = async_getpending(ps, arg);
1634         if (!as) {
1635                 spin_unlock_irqrestore(&ps->lock, flags);
1636                 return -EINVAL;
1637         }
1638
1639         urb = as->urb;
1640         usb_get_urb(urb);
1641         spin_unlock_irqrestore(&ps->lock, flags);
1642
1643         usb_kill_urb(urb);
1644         usb_put_urb(urb);
1645
1646         return 0;
1647 }
1648
1649 static int processcompl(struct async *as, void __user * __user *arg)
1650 {
1651         struct urb *urb = as->urb;
1652         struct usbdevfs_urb __user *userurb = as->userurb;
1653         void __user *addr = as->userurb;
1654         unsigned int i;
1655
1656         if (as->userbuffer && urb->actual_length) {
1657                 if (copy_urb_data_to_user(as->userbuffer, urb))
1658                         goto err_out;
1659         }
1660         if (put_user(as->status, &userurb->status))
1661                 goto err_out;
1662         if (put_user(urb->actual_length, &userurb->actual_length))
1663                 goto err_out;
1664         if (put_user(urb->error_count, &userurb->error_count))
1665                 goto err_out;
1666
1667         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1668                 for (i = 0; i < urb->number_of_packets; i++) {
1669                         if (put_user(urb->iso_frame_desc[i].actual_length,
1670                                      &userurb->iso_frame_desc[i].actual_length))
1671                                 goto err_out;
1672                         if (put_user(urb->iso_frame_desc[i].status,
1673                                      &userurb->iso_frame_desc[i].status))
1674                                 goto err_out;
1675                 }
1676         }
1677
1678         if (put_user(addr, (void __user * __user *)arg))
1679                 return -EFAULT;
1680         return 0;
1681
1682 err_out:
1683         return -EFAULT;
1684 }
1685
1686 static struct async *reap_as(struct usb_dev_state *ps)
1687 {
1688         DECLARE_WAITQUEUE(wait, current);
1689         struct async *as = NULL;
1690         struct usb_device *dev = ps->dev;
1691
1692         add_wait_queue(&ps->wait, &wait);
1693         for (;;) {
1694                 __set_current_state(TASK_INTERRUPTIBLE);
1695                 as = async_getcompleted(ps);
1696                 if (as || !connected(ps))
1697                         break;
1698                 if (signal_pending(current))
1699                         break;
1700                 usb_unlock_device(dev);
1701                 schedule();
1702                 usb_lock_device(dev);
1703         }
1704         remove_wait_queue(&ps->wait, &wait);
1705         set_current_state(TASK_RUNNING);
1706         return as;
1707 }
1708
1709 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1710 {
1711         struct async *as = reap_as(ps);
1712         if (as) {
1713                 int retval = processcompl(as, (void __user * __user *)arg);
1714                 free_async(as);
1715                 return retval;
1716         }
1717         if (signal_pending(current))
1718                 return -EINTR;
1719         return -ENODEV;
1720 }
1721
1722 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1723 {
1724         int retval;
1725         struct async *as;
1726
1727         as = async_getcompleted(ps);
1728         if (as) {
1729                 retval = processcompl(as, (void __user * __user *)arg);
1730                 free_async(as);
1731         } else {
1732                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1733         }
1734         return retval;
1735 }
1736
1737 #ifdef CONFIG_COMPAT
1738 static int proc_control_compat(struct usb_dev_state *ps,
1739                                 struct usbdevfs_ctrltransfer32 __user *p32)
1740 {
1741         struct usbdevfs_ctrltransfer __user *p;
1742         __u32 udata;
1743         p = compat_alloc_user_space(sizeof(*p));
1744         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1745             get_user(udata, &p32->data) ||
1746             put_user(compat_ptr(udata), &p->data))
1747                 return -EFAULT;
1748         return proc_control(ps, p);
1749 }
1750
1751 static int proc_bulk_compat(struct usb_dev_state *ps,
1752                         struct usbdevfs_bulktransfer32 __user *p32)
1753 {
1754         struct usbdevfs_bulktransfer __user *p;
1755         compat_uint_t n;
1756         compat_caddr_t addr;
1757
1758         p = compat_alloc_user_space(sizeof(*p));
1759
1760         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1761             get_user(n, &p32->len) || put_user(n, &p->len) ||
1762             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1763             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1764                 return -EFAULT;
1765
1766         return proc_bulk(ps, p);
1767 }
1768 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1769 {
1770         struct usbdevfs_disconnectsignal32 ds;
1771
1772         if (copy_from_user(&ds, arg, sizeof(ds)))
1773                 return -EFAULT;
1774         ps->discsignr = ds.signr;
1775         ps->disccontext = compat_ptr(ds.context);
1776         return 0;
1777 }
1778
1779 static int get_urb32(struct usbdevfs_urb *kurb,
1780                      struct usbdevfs_urb32 __user *uurb)
1781 {
1782         __u32  uptr;
1783         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1784             __get_user(kurb->type, &uurb->type) ||
1785             __get_user(kurb->endpoint, &uurb->endpoint) ||
1786             __get_user(kurb->status, &uurb->status) ||
1787             __get_user(kurb->flags, &uurb->flags) ||
1788             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1789             __get_user(kurb->actual_length, &uurb->actual_length) ||
1790             __get_user(kurb->start_frame, &uurb->start_frame) ||
1791             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1792             __get_user(kurb->error_count, &uurb->error_count) ||
1793             __get_user(kurb->signr, &uurb->signr))
1794                 return -EFAULT;
1795
1796         if (__get_user(uptr, &uurb->buffer))
1797                 return -EFAULT;
1798         kurb->buffer = compat_ptr(uptr);
1799         if (__get_user(uptr, &uurb->usercontext))
1800                 return -EFAULT;
1801         kurb->usercontext = compat_ptr(uptr);
1802
1803         return 0;
1804 }
1805
1806 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1807 {
1808         struct usbdevfs_urb uurb;
1809
1810         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1811                 return -EFAULT;
1812
1813         return proc_do_submiturb(ps, &uurb,
1814                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1815                         arg);
1816 }
1817
1818 static int processcompl_compat(struct async *as, void __user * __user *arg)
1819 {
1820         struct urb *urb = as->urb;
1821         struct usbdevfs_urb32 __user *userurb = as->userurb;
1822         void __user *addr = as->userurb;
1823         unsigned int i;
1824
1825         if (as->userbuffer && urb->actual_length) {
1826                 if (copy_urb_data_to_user(as->userbuffer, urb))
1827                         return -EFAULT;
1828         }
1829         if (put_user(as->status, &userurb->status))
1830                 return -EFAULT;
1831         if (put_user(urb->actual_length, &userurb->actual_length))
1832                 return -EFAULT;
1833         if (put_user(urb->error_count, &userurb->error_count))
1834                 return -EFAULT;
1835
1836         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1837                 for (i = 0; i < urb->number_of_packets; i++) {
1838                         if (put_user(urb->iso_frame_desc[i].actual_length,
1839                                      &userurb->iso_frame_desc[i].actual_length))
1840                                 return -EFAULT;
1841                         if (put_user(urb->iso_frame_desc[i].status,
1842                                      &userurb->iso_frame_desc[i].status))
1843                                 return -EFAULT;
1844                 }
1845         }
1846
1847         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1848                 return -EFAULT;
1849         return 0;
1850 }
1851
1852 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
1853 {
1854         struct async *as = reap_as(ps);
1855         if (as) {
1856                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1857                 free_async(as);
1858                 return retval;
1859         }
1860         if (signal_pending(current))
1861                 return -EINTR;
1862         return -ENODEV;
1863 }
1864
1865 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
1866 {
1867         int retval;
1868         struct async *as;
1869
1870         as = async_getcompleted(ps);
1871         if (as) {
1872                 retval = processcompl_compat(as, (void __user * __user *)arg);
1873                 free_async(as);
1874         } else {
1875                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1876         }
1877         return retval;
1878 }
1879
1880
1881 #endif
1882
1883 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
1884 {
1885         struct usbdevfs_disconnectsignal ds;
1886
1887         if (copy_from_user(&ds, arg, sizeof(ds)))
1888                 return -EFAULT;
1889         ps->discsignr = ds.signr;
1890         ps->disccontext = ds.context;
1891         return 0;
1892 }
1893
1894 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
1895 {
1896         unsigned int ifnum;
1897
1898         if (get_user(ifnum, (unsigned int __user *)arg))
1899                 return -EFAULT;
1900         return claimintf(ps, ifnum);
1901 }
1902
1903 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
1904 {
1905         unsigned int ifnum;
1906         int ret;
1907
1908         if (get_user(ifnum, (unsigned int __user *)arg))
1909                 return -EFAULT;
1910         ret = releaseintf(ps, ifnum);
1911         if (ret < 0)
1912                 return ret;
1913         destroy_async_on_interface (ps, ifnum);
1914         return 0;
1915 }
1916
1917 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
1918 {
1919         int                     size;
1920         void                    *buf = NULL;
1921         int                     retval = 0;
1922         struct usb_interface    *intf = NULL;
1923         struct usb_driver       *driver = NULL;
1924
1925         /* alloc buffer */
1926         size = _IOC_SIZE(ctl->ioctl_code);
1927         if (size > 0) {
1928                 buf = kmalloc(size, GFP_KERNEL);
1929                 if (buf == NULL)
1930                         return -ENOMEM;
1931                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1932                         if (copy_from_user(buf, ctl->data, size)) {
1933                                 kfree(buf);
1934                                 return -EFAULT;
1935                         }
1936                 } else {
1937                         memset(buf, 0, size);
1938                 }
1939         }
1940
1941         if (!connected(ps)) {
1942                 kfree(buf);
1943                 return -ENODEV;
1944         }
1945
1946         if (ps->dev->state != USB_STATE_CONFIGURED)
1947                 retval = -EHOSTUNREACH;
1948         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1949                 retval = -EINVAL;
1950         else switch (ctl->ioctl_code) {
1951
1952         /* disconnect kernel driver from interface */
1953         case USBDEVFS_DISCONNECT:
1954                 if (intf->dev.driver) {
1955                         driver = to_usb_driver(intf->dev.driver);
1956                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1957                         usb_driver_release_interface(driver, intf);
1958                 } else
1959                         retval = -ENODATA;
1960                 break;
1961
1962         /* let kernel drivers try to (re)bind to the interface */
1963         case USBDEVFS_CONNECT:
1964                 if (!intf->dev.driver)
1965                         retval = device_attach(&intf->dev);
1966                 else
1967                         retval = -EBUSY;
1968                 break;
1969
1970         /* talk directly to the interface's driver */
1971         default:
1972                 if (intf->dev.driver)
1973                         driver = to_usb_driver(intf->dev.driver);
1974                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1975                         retval = -ENOTTY;
1976                 } else {
1977                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1978                         if (retval == -ENOIOCTLCMD)
1979                                 retval = -ENOTTY;
1980                 }
1981         }
1982
1983         /* cleanup and return */
1984         if (retval >= 0
1985                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1986                         && size > 0
1987                         && copy_to_user(ctl->data, buf, size) != 0)
1988                 retval = -EFAULT;
1989
1990         kfree(buf);
1991         return retval;
1992 }
1993
1994 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
1995 {
1996         struct usbdevfs_ioctl   ctrl;
1997
1998         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1999                 return -EFAULT;
2000         return proc_ioctl(ps, &ctrl);
2001 }
2002
2003 #ifdef CONFIG_COMPAT
2004 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2005 {
2006         struct usbdevfs_ioctl32 __user *uioc;
2007         struct usbdevfs_ioctl ctrl;
2008         u32 udata;
2009
2010         uioc = compat_ptr((long)arg);
2011         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
2012             __get_user(ctrl.ifno, &uioc->ifno) ||
2013             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
2014             __get_user(udata, &uioc->data))
2015                 return -EFAULT;
2016         ctrl.data = compat_ptr(udata);
2017
2018         return proc_ioctl(ps, &ctrl);
2019 }
2020 #endif
2021
2022 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2023 {
2024         unsigned portnum;
2025         int rc;
2026
2027         if (get_user(portnum, (unsigned __user *) arg))
2028                 return -EFAULT;
2029         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2030         if (rc == 0)
2031                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2032                         portnum, task_pid_nr(current), current->comm);
2033         return rc;
2034 }
2035
2036 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2037 {
2038         unsigned portnum;
2039
2040         if (get_user(portnum, (unsigned __user *) arg))
2041                 return -EFAULT;
2042         return usb_hub_release_port(ps->dev, portnum, ps);
2043 }
2044
2045 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2046 {
2047         __u32 caps;
2048
2049         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2050                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT;
2051         if (!ps->dev->bus->no_stop_on_short)
2052                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2053         if (ps->dev->bus->sg_tablesize)
2054                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2055
2056         if (put_user(caps, (__u32 __user *)arg))
2057                 return -EFAULT;
2058
2059         return 0;
2060 }
2061
2062 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2063 {
2064         struct usbdevfs_disconnect_claim dc;
2065         struct usb_interface *intf;
2066
2067         if (copy_from_user(&dc, arg, sizeof(dc)))
2068                 return -EFAULT;
2069
2070         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2071         if (!intf)
2072                 return -EINVAL;
2073
2074         if (intf->dev.driver) {
2075                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2076
2077                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2078                                 strncmp(dc.driver, intf->dev.driver->name,
2079                                         sizeof(dc.driver)) != 0)
2080                         return -EBUSY;
2081
2082                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2083                                 strncmp(dc.driver, intf->dev.driver->name,
2084                                         sizeof(dc.driver)) == 0)
2085                         return -EBUSY;
2086
2087                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2088                 usb_driver_release_interface(driver, intf);
2089         }
2090
2091         return claimintf(ps, dc.interface);
2092 }
2093
2094 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2095 {
2096         unsigned num_streams, num_eps;
2097         struct usb_host_endpoint **eps;
2098         struct usb_interface *intf;
2099         int r;
2100
2101         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2102                                    &eps, &intf);
2103         if (r)
2104                 return r;
2105
2106         destroy_async_on_interface(ps,
2107                                    intf->altsetting[0].desc.bInterfaceNumber);
2108
2109         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2110         kfree(eps);
2111         return r;
2112 }
2113
2114 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2115 {
2116         unsigned num_eps;
2117         struct usb_host_endpoint **eps;
2118         struct usb_interface *intf;
2119         int r;
2120
2121         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2122         if (r)
2123                 return r;
2124
2125         destroy_async_on_interface(ps,
2126                                    intf->altsetting[0].desc.bInterfaceNumber);
2127
2128         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2129         kfree(eps);
2130         return r;
2131 }
2132
2133 /*
2134  * NOTE:  All requests here that have interface numbers as parameters
2135  * are assuming that somehow the configuration has been prevented from
2136  * changing.  But there's no mechanism to ensure that...
2137  */
2138 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2139                                 void __user *p)
2140 {
2141         struct usb_dev_state *ps = file->private_data;
2142         struct inode *inode = file_inode(file);
2143         struct usb_device *dev = ps->dev;
2144         int ret = -ENOTTY;
2145
2146         if (!(file->f_mode & FMODE_WRITE))
2147                 return -EPERM;
2148
2149         usb_lock_device(dev);
2150
2151         /* Reap operations are allowed even after disconnection */
2152         switch (cmd) {
2153         case USBDEVFS_REAPURB:
2154                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2155                 ret = proc_reapurb(ps, p);
2156                 goto done;
2157
2158         case USBDEVFS_REAPURBNDELAY:
2159                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2160                 ret = proc_reapurbnonblock(ps, p);
2161                 goto done;
2162
2163 #ifdef CONFIG_COMPAT
2164         case USBDEVFS_REAPURB32:
2165                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2166                 ret = proc_reapurb_compat(ps, p);
2167                 goto done;
2168
2169         case USBDEVFS_REAPURBNDELAY32:
2170                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2171                 ret = proc_reapurbnonblock_compat(ps, p);
2172                 goto done;
2173 #endif
2174         }
2175
2176         if (!connected(ps)) {
2177                 usb_unlock_device(dev);
2178                 return -ENODEV;
2179         }
2180
2181         switch (cmd) {
2182         case USBDEVFS_CONTROL:
2183                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2184                 ret = proc_control(ps, p);
2185                 if (ret >= 0)
2186                         inode->i_mtime = CURRENT_TIME;
2187                 break;
2188
2189         case USBDEVFS_BULK:
2190                 snoop(&dev->dev, "%s: BULK\n", __func__);
2191                 ret = proc_bulk(ps, p);
2192                 if (ret >= 0)
2193                         inode->i_mtime = CURRENT_TIME;
2194                 break;
2195
2196         case USBDEVFS_RESETEP:
2197                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2198                 ret = proc_resetep(ps, p);
2199                 if (ret >= 0)
2200                         inode->i_mtime = CURRENT_TIME;
2201                 break;
2202
2203         case USBDEVFS_RESET:
2204                 snoop(&dev->dev, "%s: RESET\n", __func__);
2205                 ret = proc_resetdevice(ps);
2206                 break;
2207
2208         case USBDEVFS_CLEAR_HALT:
2209                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2210                 ret = proc_clearhalt(ps, p);
2211                 if (ret >= 0)
2212                         inode->i_mtime = CURRENT_TIME;
2213                 break;
2214
2215         case USBDEVFS_GETDRIVER:
2216                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2217                 ret = proc_getdriver(ps, p);
2218                 break;
2219
2220         case USBDEVFS_CONNECTINFO:
2221                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2222                 ret = proc_connectinfo(ps, p);
2223                 break;
2224
2225         case USBDEVFS_SETINTERFACE:
2226                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2227                 ret = proc_setintf(ps, p);
2228                 break;
2229
2230         case USBDEVFS_SETCONFIGURATION:
2231                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2232                 ret = proc_setconfig(ps, p);
2233                 break;
2234
2235         case USBDEVFS_SUBMITURB:
2236                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2237                 ret = proc_submiturb(ps, p);
2238                 if (ret >= 0)
2239                         inode->i_mtime = CURRENT_TIME;
2240                 break;
2241
2242 #ifdef CONFIG_COMPAT
2243         case USBDEVFS_CONTROL32:
2244                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2245                 ret = proc_control_compat(ps, p);
2246                 if (ret >= 0)
2247                         inode->i_mtime = CURRENT_TIME;
2248                 break;
2249
2250         case USBDEVFS_BULK32:
2251                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2252                 ret = proc_bulk_compat(ps, p);
2253                 if (ret >= 0)
2254                         inode->i_mtime = CURRENT_TIME;
2255                 break;
2256
2257         case USBDEVFS_DISCSIGNAL32:
2258                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2259                 ret = proc_disconnectsignal_compat(ps, p);
2260                 break;
2261
2262         case USBDEVFS_SUBMITURB32:
2263                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2264                 ret = proc_submiturb_compat(ps, p);
2265                 if (ret >= 0)
2266                         inode->i_mtime = CURRENT_TIME;
2267                 break;
2268
2269         case USBDEVFS_IOCTL32:
2270                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2271                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2272                 break;
2273 #endif
2274
2275         case USBDEVFS_DISCARDURB:
2276                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2277                 ret = proc_unlinkurb(ps, p);
2278                 break;
2279
2280         case USBDEVFS_DISCSIGNAL:
2281                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2282                 ret = proc_disconnectsignal(ps, p);
2283                 break;
2284
2285         case USBDEVFS_CLAIMINTERFACE:
2286                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2287                 ret = proc_claiminterface(ps, p);
2288                 break;
2289
2290         case USBDEVFS_RELEASEINTERFACE:
2291                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2292                 ret = proc_releaseinterface(ps, p);
2293                 break;
2294
2295         case USBDEVFS_IOCTL:
2296                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2297                 ret = proc_ioctl_default(ps, p);
2298                 break;
2299
2300         case USBDEVFS_CLAIM_PORT:
2301                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2302                 ret = proc_claim_port(ps, p);
2303                 break;
2304
2305         case USBDEVFS_RELEASE_PORT:
2306                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2307                 ret = proc_release_port(ps, p);
2308                 break;
2309         case USBDEVFS_GET_CAPABILITIES:
2310                 ret = proc_get_capabilities(ps, p);
2311                 break;
2312         case USBDEVFS_DISCONNECT_CLAIM:
2313                 ret = proc_disconnect_claim(ps, p);
2314                 break;
2315         case USBDEVFS_ALLOC_STREAMS:
2316                 ret = proc_alloc_streams(ps, p);
2317                 break;
2318         case USBDEVFS_FREE_STREAMS:
2319                 ret = proc_free_streams(ps, p);
2320                 break;
2321         }
2322
2323  done:
2324         usb_unlock_device(dev);
2325         if (ret >= 0)
2326                 inode->i_atime = CURRENT_TIME;
2327         return ret;
2328 }
2329
2330 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2331                         unsigned long arg)
2332 {
2333         int ret;
2334
2335         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2336
2337         return ret;
2338 }
2339
2340 #ifdef CONFIG_COMPAT
2341 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2342                         unsigned long arg)
2343 {
2344         int ret;
2345
2346         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2347
2348         return ret;
2349 }
2350 #endif
2351
2352 /* No kernel lock - fine */
2353 static unsigned int usbdev_poll(struct file *file,
2354                                 struct poll_table_struct *wait)
2355 {
2356         struct usb_dev_state *ps = file->private_data;
2357         unsigned int mask = 0;
2358
2359         poll_wait(file, &ps->wait, wait);
2360         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2361                 mask |= POLLOUT | POLLWRNORM;
2362         if (!connected(ps))
2363                 mask |= POLLERR | POLLHUP;
2364         return mask;
2365 }
2366
2367 const struct file_operations usbdev_file_operations = {
2368         .owner =          THIS_MODULE,
2369         .llseek =         usbdev_lseek,
2370         .read =           usbdev_read,
2371         .poll =           usbdev_poll,
2372         .unlocked_ioctl = usbdev_ioctl,
2373 #ifdef CONFIG_COMPAT
2374         .compat_ioctl =   usbdev_compat_ioctl,
2375 #endif
2376         .open =           usbdev_open,
2377         .release =        usbdev_release,
2378 };
2379
2380 static void usbdev_remove(struct usb_device *udev)
2381 {
2382         struct usb_dev_state *ps;
2383         struct siginfo sinfo;
2384
2385         while (!list_empty(&udev->filelist)) {
2386                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2387                 destroy_all_async(ps);
2388                 wake_up_all(&ps->wait);
2389                 list_del_init(&ps->list);
2390                 if (ps->discsignr) {
2391                         memset(&sinfo, 0, sizeof(sinfo));
2392                         sinfo.si_signo = ps->discsignr;
2393                         sinfo.si_errno = EPIPE;
2394                         sinfo.si_code = SI_ASYNCIO;
2395                         sinfo.si_addr = ps->disccontext;
2396                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2397                                         ps->disc_pid, ps->cred, ps->secid);
2398                 }
2399         }
2400 }
2401
2402 static int usbdev_notify(struct notifier_block *self,
2403                                unsigned long action, void *dev)
2404 {
2405         switch (action) {
2406         case USB_DEVICE_ADD:
2407                 break;
2408         case USB_DEVICE_REMOVE:
2409                 usbdev_remove(dev);
2410                 break;
2411         }
2412         return NOTIFY_OK;
2413 }
2414
2415 static struct notifier_block usbdev_nb = {
2416         .notifier_call =        usbdev_notify,
2417 };
2418
2419 static struct cdev usb_device_cdev;
2420
2421 int __init usb_devio_init(void)
2422 {
2423         int retval;
2424
2425         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2426                                         "usb_device");
2427         if (retval) {
2428                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2429                 goto out;
2430         }
2431         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2432         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2433         if (retval) {
2434                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2435                        USB_DEVICE_MAJOR);
2436                 goto error_cdev;
2437         }
2438         usb_register_notify(&usbdev_nb);
2439 out:
2440         return retval;
2441
2442 error_cdev:
2443         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2444         goto out;
2445 }
2446
2447 void usb_devio_cleanup(void)
2448 {
2449         usb_unregister_notify(&usbdev_nb);
2450         cdev_del(&usb_device_cdev);
2451         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2452 }