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) == USB_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         if (!(tbuf = kmalloc(len1, GFP_KERNEL))) {
1086                 ret = -ENOMEM;
1087                 goto done;
1088         }
1089         tmo = bulk.timeout;
1090         if (bulk.ep & 0x80) {
1091                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1092                         ret = -EINVAL;
1093                         goto done;
1094                 }
1095                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1096
1097                 usb_unlock_device(dev);
1098                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1099                 usb_lock_device(dev);
1100                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1101
1102                 if (!i && len2) {
1103                         if (copy_to_user(bulk.data, tbuf, len2)) {
1104                                 ret = -EFAULT;
1105                                 goto done;
1106                         }
1107                 }
1108         } else {
1109                 if (len1) {
1110                         if (copy_from_user(tbuf, bulk.data, len1)) {
1111                                 ret = -EFAULT;
1112                                 goto done;
1113                         }
1114                 }
1115                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1116
1117                 usb_unlock_device(dev);
1118                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1119                 usb_lock_device(dev);
1120                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1121         }
1122         ret = (i < 0 ? i : len2);
1123  done:
1124         kfree(tbuf);
1125         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1126         return ret;
1127 }
1128
1129 static void check_reset_of_active_ep(struct usb_device *udev,
1130                 unsigned int epnum, char *ioctl_name)
1131 {
1132         struct usb_host_endpoint **eps;
1133         struct usb_host_endpoint *ep;
1134
1135         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1136         ep = eps[epnum & 0x0f];
1137         if (ep && !list_empty(&ep->urb_list))
1138                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1139                                 task_pid_nr(current), current->comm,
1140                                 ioctl_name, epnum);
1141 }
1142
1143 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1144 {
1145         unsigned int ep;
1146         int ret;
1147
1148         if (get_user(ep, (unsigned int __user *)arg))
1149                 return -EFAULT;
1150         ret = findintfep(ps->dev, ep);
1151         if (ret < 0)
1152                 return ret;
1153         ret = checkintf(ps, ret);
1154         if (ret)
1155                 return ret;
1156         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1157         usb_reset_endpoint(ps->dev, ep);
1158         return 0;
1159 }
1160
1161 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1162 {
1163         unsigned int ep;
1164         int pipe;
1165         int ret;
1166
1167         if (get_user(ep, (unsigned int __user *)arg))
1168                 return -EFAULT;
1169         ret = findintfep(ps->dev, ep);
1170         if (ret < 0)
1171                 return ret;
1172         ret = checkintf(ps, ret);
1173         if (ret)
1174                 return ret;
1175         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1176         if (ep & USB_DIR_IN)
1177                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1178         else
1179                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1180
1181         return usb_clear_halt(ps->dev, pipe);
1182 }
1183
1184 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1185 {
1186         struct usbdevfs_getdriver gd;
1187         struct usb_interface *intf;
1188         int ret;
1189
1190         if (copy_from_user(&gd, arg, sizeof(gd)))
1191                 return -EFAULT;
1192         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1193         if (!intf || !intf->dev.driver)
1194                 ret = -ENODATA;
1195         else {
1196                 strlcpy(gd.driver, intf->dev.driver->name,
1197                                 sizeof(gd.driver));
1198                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1199         }
1200         return ret;
1201 }
1202
1203 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1204 {
1205         struct usbdevfs_connectinfo ci = {
1206                 .devnum = ps->dev->devnum,
1207                 .slow = ps->dev->speed == USB_SPEED_LOW
1208         };
1209
1210         if (copy_to_user(arg, &ci, sizeof(ci)))
1211                 return -EFAULT;
1212         return 0;
1213 }
1214
1215 static int proc_resetdevice(struct usb_dev_state *ps)
1216 {
1217         return usb_reset_device(ps->dev);
1218 }
1219
1220 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1221 {
1222         struct usbdevfs_setinterface setintf;
1223         int ret;
1224
1225         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1226                 return -EFAULT;
1227         if ((ret = checkintf(ps, setintf.interface)))
1228                 return ret;
1229
1230         destroy_async_on_interface(ps, setintf.interface);
1231
1232         return usb_set_interface(ps->dev, setintf.interface,
1233                         setintf.altsetting);
1234 }
1235
1236 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1237 {
1238         int u;
1239         int status = 0;
1240         struct usb_host_config *actconfig;
1241
1242         if (get_user(u, (int __user *)arg))
1243                 return -EFAULT;
1244
1245         actconfig = ps->dev->actconfig;
1246
1247         /* Don't touch the device if any interfaces are claimed.
1248          * It could interfere with other drivers' operations, and if
1249          * an interface is claimed by usbfs it could easily deadlock.
1250          */
1251         if (actconfig) {
1252                 int i;
1253
1254                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1255                         if (usb_interface_claimed(actconfig->interface[i])) {
1256                                 dev_warn(&ps->dev->dev,
1257                                         "usbfs: interface %d claimed by %s "
1258                                         "while '%s' sets config #%d\n",
1259                                         actconfig->interface[i]
1260                                                 ->cur_altsetting
1261                                                 ->desc.bInterfaceNumber,
1262                                         actconfig->interface[i]
1263                                                 ->dev.driver->name,
1264                                         current->comm, u);
1265                                 status = -EBUSY;
1266                                 break;
1267                         }
1268                 }
1269         }
1270
1271         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1272          * so avoid usb_set_configuration()'s kick to sysfs
1273          */
1274         if (status == 0) {
1275                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1276                         status = usb_reset_configuration(ps->dev);
1277                 else
1278                         status = usb_set_configuration(ps->dev, u);
1279         }
1280
1281         return status;
1282 }
1283
1284 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1285                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1286                         void __user *arg)
1287 {
1288         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1289         struct usb_host_endpoint *ep;
1290         struct async *as = NULL;
1291         struct usb_ctrlrequest *dr = NULL;
1292         unsigned int u, totlen, isofrmlen;
1293         int i, ret, is_in, num_sgs = 0, ifnum = -1;
1294         int number_of_packets = 0;
1295         unsigned int stream_id = 0;
1296         void *buf;
1297
1298         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1299                                 USBDEVFS_URB_SHORT_NOT_OK |
1300                                 USBDEVFS_URB_BULK_CONTINUATION |
1301                                 USBDEVFS_URB_NO_FSBR |
1302                                 USBDEVFS_URB_ZERO_PACKET |
1303                                 USBDEVFS_URB_NO_INTERRUPT))
1304                 return -EINVAL;
1305         if (uurb->buffer_length > 0 && !uurb->buffer)
1306                 return -EINVAL;
1307         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1308             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1309                 ifnum = findintfep(ps->dev, uurb->endpoint);
1310                 if (ifnum < 0)
1311                         return ifnum;
1312                 ret = checkintf(ps, ifnum);
1313                 if (ret)
1314                         return ret;
1315         }
1316         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1317         if (!ep)
1318                 return -ENOENT;
1319         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1320
1321         u = 0;
1322         switch(uurb->type) {
1323         case USBDEVFS_URB_TYPE_CONTROL:
1324                 if (!usb_endpoint_xfer_control(&ep->desc))
1325                         return -EINVAL;
1326                 /* min 8 byte setup packet */
1327                 if (uurb->buffer_length < 8)
1328                         return -EINVAL;
1329                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1330                 if (!dr)
1331                         return -ENOMEM;
1332                 if (copy_from_user(dr, uurb->buffer, 8)) {
1333                         ret = -EFAULT;
1334                         goto error;
1335                 }
1336                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1337                         ret = -EINVAL;
1338                         goto error;
1339                 }
1340                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1341                                       le16_to_cpup(&dr->wIndex));
1342                 if (ret)
1343                         goto error;
1344                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1345                 uurb->buffer += 8;
1346                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1347                         is_in = 1;
1348                         uurb->endpoint |= USB_DIR_IN;
1349                 } else {
1350                         is_in = 0;
1351                         uurb->endpoint &= ~USB_DIR_IN;
1352                 }
1353                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1354                         "bRequest=%02x wValue=%04x "
1355                         "wIndex=%04x wLength=%04x\n",
1356                         dr->bRequestType, dr->bRequest,
1357                         __le16_to_cpup(&dr->wValue),
1358                         __le16_to_cpup(&dr->wIndex),
1359                         __le16_to_cpup(&dr->wLength));
1360                 u = sizeof(struct usb_ctrlrequest);
1361                 break;
1362
1363         case USBDEVFS_URB_TYPE_BULK:
1364                 switch (usb_endpoint_type(&ep->desc)) {
1365                 case USB_ENDPOINT_XFER_CONTROL:
1366                 case USB_ENDPOINT_XFER_ISOC:
1367                         return -EINVAL;
1368                 case USB_ENDPOINT_XFER_INT:
1369                         /* allow single-shot interrupt transfers */
1370                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1371                         goto interrupt_urb;
1372                 }
1373                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1374                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1375                         num_sgs = 0;
1376                 if (ep->streams)
1377                         stream_id = uurb->stream_id;
1378                 break;
1379
1380         case USBDEVFS_URB_TYPE_INTERRUPT:
1381                 if (!usb_endpoint_xfer_int(&ep->desc))
1382                         return -EINVAL;
1383  interrupt_urb:
1384                 break;
1385
1386         case USBDEVFS_URB_TYPE_ISO:
1387                 /* arbitrary limit */
1388                 if (uurb->number_of_packets < 1 ||
1389                     uurb->number_of_packets > 128)
1390                         return -EINVAL;
1391                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1392                         return -EINVAL;
1393                 number_of_packets = uurb->number_of_packets;
1394                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1395                                    number_of_packets;
1396                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1397                         return -ENOMEM;
1398                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1399                         ret = -EFAULT;
1400                         goto error;
1401                 }
1402                 for (totlen = u = 0; u < number_of_packets; u++) {
1403                         /*
1404                          * arbitrary limit need for USB 3.0
1405                          * bMaxBurst (0~15 allowed, 1~16 packets)
1406                          * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1407                          * sizemax: 1024 * 16 * 3 = 49152
1408                          */
1409                         if (isopkt[u].length > 49152) {
1410                                 ret = -EINVAL;
1411                                 goto error;
1412                         }
1413                         totlen += isopkt[u].length;
1414                 }
1415                 u *= sizeof(struct usb_iso_packet_descriptor);
1416                 uurb->buffer_length = totlen;
1417                 break;
1418
1419         default:
1420                 return -EINVAL;
1421         }
1422
1423         if (uurb->buffer_length >= USBFS_XFER_MAX) {
1424                 ret = -EINVAL;
1425                 goto error;
1426         }
1427         if (uurb->buffer_length > 0 &&
1428                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1429                                 uurb->buffer, uurb->buffer_length)) {
1430                 ret = -EFAULT;
1431                 goto error;
1432         }
1433         as = alloc_async(number_of_packets);
1434         if (!as) {
1435                 ret = -ENOMEM;
1436                 goto error;
1437         }
1438
1439         u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1440              num_sgs * sizeof(struct scatterlist);
1441         ret = usbfs_increase_memory_usage(u);
1442         if (ret)
1443                 goto error;
1444         as->mem_usage = u;
1445
1446         if (num_sgs) {
1447                 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1448                                       GFP_KERNEL);
1449                 if (!as->urb->sg) {
1450                         ret = -ENOMEM;
1451                         goto error;
1452                 }
1453                 as->urb->num_sgs = num_sgs;
1454                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1455
1456                 totlen = uurb->buffer_length;
1457                 for (i = 0; i < as->urb->num_sgs; i++) {
1458                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1459                         buf = kmalloc(u, GFP_KERNEL);
1460                         if (!buf) {
1461                                 ret = -ENOMEM;
1462                                 goto error;
1463                         }
1464                         sg_set_buf(&as->urb->sg[i], buf, u);
1465
1466                         if (!is_in) {
1467                                 if (copy_from_user(buf, uurb->buffer, u)) {
1468                                         ret = -EFAULT;
1469                                         goto error;
1470                                 }
1471                                 uurb->buffer += u;
1472                         }
1473                         totlen -= u;
1474                 }
1475         } else if (uurb->buffer_length > 0) {
1476                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1477                                 GFP_KERNEL);
1478                 if (!as->urb->transfer_buffer) {
1479                         ret = -ENOMEM;
1480                         goto error;
1481                 }
1482
1483                 if (!is_in) {
1484                         if (copy_from_user(as->urb->transfer_buffer,
1485                                            uurb->buffer,
1486                                            uurb->buffer_length)) {
1487                                 ret = -EFAULT;
1488                                 goto error;
1489                         }
1490                 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1491                         /*
1492                          * Isochronous input data may end up being
1493                          * discontiguous if some of the packets are short.
1494                          * Clear the buffer so that the gaps don't leak
1495                          * kernel data to userspace.
1496                          */
1497                         memset(as->urb->transfer_buffer, 0,
1498                                         uurb->buffer_length);
1499                 }
1500         }
1501         as->urb->dev = ps->dev;
1502         as->urb->pipe = (uurb->type << 30) |
1503                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1504                         (uurb->endpoint & USB_DIR_IN);
1505
1506         /* This tedious sequence is necessary because the URB_* flags
1507          * are internal to the kernel and subject to change, whereas
1508          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1509          */
1510         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1511         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1512                 u |= URB_ISO_ASAP;
1513         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK && is_in)
1514                 u |= URB_SHORT_NOT_OK;
1515         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1516                 u |= URB_NO_FSBR;
1517         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1518                 u |= URB_ZERO_PACKET;
1519         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1520                 u |= URB_NO_INTERRUPT;
1521         as->urb->transfer_flags = u;
1522
1523         as->urb->transfer_buffer_length = uurb->buffer_length;
1524         as->urb->setup_packet = (unsigned char *)dr;
1525         dr = NULL;
1526         as->urb->start_frame = uurb->start_frame;
1527         as->urb->number_of_packets = number_of_packets;
1528         as->urb->stream_id = stream_id;
1529         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1530                         ps->dev->speed == USB_SPEED_HIGH)
1531                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1532         else
1533                 as->urb->interval = ep->desc.bInterval;
1534         as->urb->context = as;
1535         as->urb->complete = async_completed;
1536         for (totlen = u = 0; u < number_of_packets; u++) {
1537                 as->urb->iso_frame_desc[u].offset = totlen;
1538                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1539                 totlen += isopkt[u].length;
1540         }
1541         kfree(isopkt);
1542         isopkt = NULL;
1543         as->ps = ps;
1544         as->userurb = arg;
1545         if (is_in && uurb->buffer_length > 0)
1546                 as->userbuffer = uurb->buffer;
1547         else
1548                 as->userbuffer = NULL;
1549         as->signr = uurb->signr;
1550         as->ifnum = ifnum;
1551         as->pid = get_pid(task_pid(current));
1552         as->cred = get_current_cred();
1553         security_task_getsecid(current, &as->secid);
1554         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1555                         as->urb->transfer_buffer_length, 0, SUBMIT,
1556                         NULL, 0);
1557         if (!is_in)
1558                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1559
1560         async_newpending(as);
1561
1562         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1563                 spin_lock_irq(&ps->lock);
1564
1565                 /* Not exactly the endpoint address; the direction bit is
1566                  * shifted to the 0x10 position so that the value will be
1567                  * between 0 and 31.
1568                  */
1569                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1570                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1571                                 >> 3);
1572
1573                 /* If this bulk URB is the start of a new transfer, re-enable
1574                  * the endpoint.  Otherwise mark it as a continuation URB.
1575                  */
1576                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1577                         as->bulk_status = AS_CONTINUATION;
1578                 else
1579                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1580
1581                 /* Don't accept continuation URBs if the endpoint is
1582                  * disabled because of an earlier error.
1583                  */
1584                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1585                         ret = -EREMOTEIO;
1586                 else
1587                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1588                 spin_unlock_irq(&ps->lock);
1589         } else {
1590                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1591         }
1592
1593         if (ret) {
1594                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1595                            "usbfs: usb_submit_urb returned %d\n", ret);
1596                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1597                                 0, ret, COMPLETE, NULL, 0);
1598                 async_removepending(as);
1599                 goto error;
1600         }
1601         return 0;
1602
1603  error:
1604         kfree(isopkt);
1605         kfree(dr);
1606         if (as)
1607                 free_async(as);
1608         return ret;
1609 }
1610
1611 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1612 {
1613         struct usbdevfs_urb uurb;
1614
1615         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1616                 return -EFAULT;
1617
1618         return proc_do_submiturb(ps, &uurb,
1619                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1620                         arg);
1621 }
1622
1623 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1624 {
1625         struct urb *urb;
1626         struct async *as;
1627         unsigned long flags;
1628
1629         spin_lock_irqsave(&ps->lock, flags);
1630         as = async_getpending(ps, arg);
1631         if (!as) {
1632                 spin_unlock_irqrestore(&ps->lock, flags);
1633                 return -EINVAL;
1634         }
1635
1636         urb = as->urb;
1637         usb_get_urb(urb);
1638         spin_unlock_irqrestore(&ps->lock, flags);
1639
1640         usb_kill_urb(urb);
1641         usb_put_urb(urb);
1642
1643         return 0;
1644 }
1645
1646 static int processcompl(struct async *as, void __user * __user *arg)
1647 {
1648         struct urb *urb = as->urb;
1649         struct usbdevfs_urb __user *userurb = as->userurb;
1650         void __user *addr = as->userurb;
1651         unsigned int i;
1652
1653         if (as->userbuffer && urb->actual_length) {
1654                 if (copy_urb_data_to_user(as->userbuffer, urb))
1655                         goto err_out;
1656         }
1657         if (put_user(as->status, &userurb->status))
1658                 goto err_out;
1659         if (put_user(urb->actual_length, &userurb->actual_length))
1660                 goto err_out;
1661         if (put_user(urb->error_count, &userurb->error_count))
1662                 goto err_out;
1663
1664         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1665                 for (i = 0; i < urb->number_of_packets; i++) {
1666                         if (put_user(urb->iso_frame_desc[i].actual_length,
1667                                      &userurb->iso_frame_desc[i].actual_length))
1668                                 goto err_out;
1669                         if (put_user(urb->iso_frame_desc[i].status,
1670                                      &userurb->iso_frame_desc[i].status))
1671                                 goto err_out;
1672                 }
1673         }
1674
1675         if (put_user(addr, (void __user * __user *)arg))
1676                 return -EFAULT;
1677         return 0;
1678
1679 err_out:
1680         return -EFAULT;
1681 }
1682
1683 static struct async *reap_as(struct usb_dev_state *ps)
1684 {
1685         DECLARE_WAITQUEUE(wait, current);
1686         struct async *as = NULL;
1687         struct usb_device *dev = ps->dev;
1688
1689         add_wait_queue(&ps->wait, &wait);
1690         for (;;) {
1691                 __set_current_state(TASK_INTERRUPTIBLE);
1692                 as = async_getcompleted(ps);
1693                 if (as || !connected(ps))
1694                         break;
1695                 if (signal_pending(current))
1696                         break;
1697                 usb_unlock_device(dev);
1698                 schedule();
1699                 usb_lock_device(dev);
1700         }
1701         remove_wait_queue(&ps->wait, &wait);
1702         set_current_state(TASK_RUNNING);
1703         return as;
1704 }
1705
1706 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1707 {
1708         struct async *as = reap_as(ps);
1709         if (as) {
1710                 int retval = processcompl(as, (void __user * __user *)arg);
1711                 free_async(as);
1712                 return retval;
1713         }
1714         if (signal_pending(current))
1715                 return -EINTR;
1716         return -ENODEV;
1717 }
1718
1719 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1720 {
1721         int retval;
1722         struct async *as;
1723
1724         as = async_getcompleted(ps);
1725         if (as) {
1726                 retval = processcompl(as, (void __user * __user *)arg);
1727                 free_async(as);
1728         } else {
1729                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1730         }
1731         return retval;
1732 }
1733
1734 #ifdef CONFIG_COMPAT
1735 static int proc_control_compat(struct usb_dev_state *ps,
1736                                 struct usbdevfs_ctrltransfer32 __user *p32)
1737 {
1738         struct usbdevfs_ctrltransfer __user *p;
1739         __u32 udata;
1740         p = compat_alloc_user_space(sizeof(*p));
1741         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1742             get_user(udata, &p32->data) ||
1743             put_user(compat_ptr(udata), &p->data))
1744                 return -EFAULT;
1745         return proc_control(ps, p);
1746 }
1747
1748 static int proc_bulk_compat(struct usb_dev_state *ps,
1749                         struct usbdevfs_bulktransfer32 __user *p32)
1750 {
1751         struct usbdevfs_bulktransfer __user *p;
1752         compat_uint_t n;
1753         compat_caddr_t addr;
1754
1755         p = compat_alloc_user_space(sizeof(*p));
1756
1757         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1758             get_user(n, &p32->len) || put_user(n, &p->len) ||
1759             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1760             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1761                 return -EFAULT;
1762
1763         return proc_bulk(ps, p);
1764 }
1765 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1766 {
1767         struct usbdevfs_disconnectsignal32 ds;
1768
1769         if (copy_from_user(&ds, arg, sizeof(ds)))
1770                 return -EFAULT;
1771         ps->discsignr = ds.signr;
1772         ps->disccontext = compat_ptr(ds.context);
1773         return 0;
1774 }
1775
1776 static int get_urb32(struct usbdevfs_urb *kurb,
1777                      struct usbdevfs_urb32 __user *uurb)
1778 {
1779         __u32  uptr;
1780         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1781             __get_user(kurb->type, &uurb->type) ||
1782             __get_user(kurb->endpoint, &uurb->endpoint) ||
1783             __get_user(kurb->status, &uurb->status) ||
1784             __get_user(kurb->flags, &uurb->flags) ||
1785             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1786             __get_user(kurb->actual_length, &uurb->actual_length) ||
1787             __get_user(kurb->start_frame, &uurb->start_frame) ||
1788             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1789             __get_user(kurb->error_count, &uurb->error_count) ||
1790             __get_user(kurb->signr, &uurb->signr))
1791                 return -EFAULT;
1792
1793         if (__get_user(uptr, &uurb->buffer))
1794                 return -EFAULT;
1795         kurb->buffer = compat_ptr(uptr);
1796         if (__get_user(uptr, &uurb->usercontext))
1797                 return -EFAULT;
1798         kurb->usercontext = compat_ptr(uptr);
1799
1800         return 0;
1801 }
1802
1803 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1804 {
1805         struct usbdevfs_urb uurb;
1806
1807         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1808                 return -EFAULT;
1809
1810         return proc_do_submiturb(ps, &uurb,
1811                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1812                         arg);
1813 }
1814
1815 static int processcompl_compat(struct async *as, void __user * __user *arg)
1816 {
1817         struct urb *urb = as->urb;
1818         struct usbdevfs_urb32 __user *userurb = as->userurb;
1819         void __user *addr = as->userurb;
1820         unsigned int i;
1821
1822         if (as->userbuffer && urb->actual_length) {
1823                 if (copy_urb_data_to_user(as->userbuffer, urb))
1824                         return -EFAULT;
1825         }
1826         if (put_user(as->status, &userurb->status))
1827                 return -EFAULT;
1828         if (put_user(urb->actual_length, &userurb->actual_length))
1829                 return -EFAULT;
1830         if (put_user(urb->error_count, &userurb->error_count))
1831                 return -EFAULT;
1832
1833         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1834                 for (i = 0; i < urb->number_of_packets; i++) {
1835                         if (put_user(urb->iso_frame_desc[i].actual_length,
1836                                      &userurb->iso_frame_desc[i].actual_length))
1837                                 return -EFAULT;
1838                         if (put_user(urb->iso_frame_desc[i].status,
1839                                      &userurb->iso_frame_desc[i].status))
1840                                 return -EFAULT;
1841                 }
1842         }
1843
1844         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1845                 return -EFAULT;
1846         return 0;
1847 }
1848
1849 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
1850 {
1851         struct async *as = reap_as(ps);
1852         if (as) {
1853                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1854                 free_async(as);
1855                 return retval;
1856         }
1857         if (signal_pending(current))
1858                 return -EINTR;
1859         return -ENODEV;
1860 }
1861
1862 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
1863 {
1864         int retval;
1865         struct async *as;
1866
1867         as = async_getcompleted(ps);
1868         if (as) {
1869                 retval = processcompl_compat(as, (void __user * __user *)arg);
1870                 free_async(as);
1871         } else {
1872                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1873         }
1874         return retval;
1875 }
1876
1877
1878 #endif
1879
1880 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
1881 {
1882         struct usbdevfs_disconnectsignal ds;
1883
1884         if (copy_from_user(&ds, arg, sizeof(ds)))
1885                 return -EFAULT;
1886         ps->discsignr = ds.signr;
1887         ps->disccontext = ds.context;
1888         return 0;
1889 }
1890
1891 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
1892 {
1893         unsigned int ifnum;
1894
1895         if (get_user(ifnum, (unsigned int __user *)arg))
1896                 return -EFAULT;
1897         return claimintf(ps, ifnum);
1898 }
1899
1900 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
1901 {
1902         unsigned int ifnum;
1903         int ret;
1904
1905         if (get_user(ifnum, (unsigned int __user *)arg))
1906                 return -EFAULT;
1907         if ((ret = releaseintf(ps, ifnum)) < 0)
1908                 return ret;
1909         destroy_async_on_interface (ps, ifnum);
1910         return 0;
1911 }
1912
1913 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
1914 {
1915         int                     size;
1916         void                    *buf = NULL;
1917         int                     retval = 0;
1918         struct usb_interface    *intf = NULL;
1919         struct usb_driver       *driver = NULL;
1920
1921         /* alloc buffer */
1922         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1923                 buf = kmalloc(size, GFP_KERNEL);
1924                 if (buf == NULL)
1925                         return -ENOMEM;
1926                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1927                         if (copy_from_user(buf, ctl->data, size)) {
1928                                 kfree(buf);
1929                                 return -EFAULT;
1930                         }
1931                 } else {
1932                         memset(buf, 0, size);
1933                 }
1934         }
1935
1936         if (!connected(ps)) {
1937                 kfree(buf);
1938                 return -ENODEV;
1939         }
1940
1941         if (ps->dev->state != USB_STATE_CONFIGURED)
1942                 retval = -EHOSTUNREACH;
1943         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1944                 retval = -EINVAL;
1945         else switch (ctl->ioctl_code) {
1946
1947         /* disconnect kernel driver from interface */
1948         case USBDEVFS_DISCONNECT:
1949                 if (intf->dev.driver) {
1950                         driver = to_usb_driver(intf->dev.driver);
1951                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1952                         usb_driver_release_interface(driver, intf);
1953                 } else
1954                         retval = -ENODATA;
1955                 break;
1956
1957         /* let kernel drivers try to (re)bind to the interface */
1958         case USBDEVFS_CONNECT:
1959                 if (!intf->dev.driver)
1960                         retval = device_attach(&intf->dev);
1961                 else
1962                         retval = -EBUSY;
1963                 break;
1964
1965         /* talk directly to the interface's driver */
1966         default:
1967                 if (intf->dev.driver)
1968                         driver = to_usb_driver(intf->dev.driver);
1969                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1970                         retval = -ENOTTY;
1971                 } else {
1972                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1973                         if (retval == -ENOIOCTLCMD)
1974                                 retval = -ENOTTY;
1975                 }
1976         }
1977
1978         /* cleanup and return */
1979         if (retval >= 0
1980                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1981                         && size > 0
1982                         && copy_to_user(ctl->data, buf, size) != 0)
1983                 retval = -EFAULT;
1984
1985         kfree(buf);
1986         return retval;
1987 }
1988
1989 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
1990 {
1991         struct usbdevfs_ioctl   ctrl;
1992
1993         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1994                 return -EFAULT;
1995         return proc_ioctl(ps, &ctrl);
1996 }
1997
1998 #ifdef CONFIG_COMPAT
1999 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2000 {
2001         struct usbdevfs_ioctl32 __user *uioc;
2002         struct usbdevfs_ioctl ctrl;
2003         u32 udata;
2004
2005         uioc = compat_ptr((long)arg);
2006         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
2007             __get_user(ctrl.ifno, &uioc->ifno) ||
2008             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
2009             __get_user(udata, &uioc->data))
2010                 return -EFAULT;
2011         ctrl.data = compat_ptr(udata);
2012
2013         return proc_ioctl(ps, &ctrl);
2014 }
2015 #endif
2016
2017 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2018 {
2019         unsigned portnum;
2020         int rc;
2021
2022         if (get_user(portnum, (unsigned __user *) arg))
2023                 return -EFAULT;
2024         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2025         if (rc == 0)
2026                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2027                         portnum, task_pid_nr(current), current->comm);
2028         return rc;
2029 }
2030
2031 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2032 {
2033         unsigned portnum;
2034
2035         if (get_user(portnum, (unsigned __user *) arg))
2036                 return -EFAULT;
2037         return usb_hub_release_port(ps->dev, portnum, ps);
2038 }
2039
2040 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2041 {
2042         __u32 caps;
2043
2044         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2045                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT;
2046         if (!ps->dev->bus->no_stop_on_short)
2047                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2048         if (ps->dev->bus->sg_tablesize)
2049                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2050
2051         if (put_user(caps, (__u32 __user *)arg))
2052                 return -EFAULT;
2053
2054         return 0;
2055 }
2056
2057 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2058 {
2059         struct usbdevfs_disconnect_claim dc;
2060         struct usb_interface *intf;
2061
2062         if (copy_from_user(&dc, arg, sizeof(dc)))
2063                 return -EFAULT;
2064
2065         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2066         if (!intf)
2067                 return -EINVAL;
2068
2069         if (intf->dev.driver) {
2070                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2071
2072                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2073                                 strncmp(dc.driver, intf->dev.driver->name,
2074                                         sizeof(dc.driver)) != 0)
2075                         return -EBUSY;
2076
2077                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2078                                 strncmp(dc.driver, intf->dev.driver->name,
2079                                         sizeof(dc.driver)) == 0)
2080                         return -EBUSY;
2081
2082                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2083                 usb_driver_release_interface(driver, intf);
2084         }
2085
2086         return claimintf(ps, dc.interface);
2087 }
2088
2089 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2090 {
2091         unsigned num_streams, num_eps;
2092         struct usb_host_endpoint **eps;
2093         struct usb_interface *intf;
2094         int r;
2095
2096         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2097                                    &eps, &intf);
2098         if (r)
2099                 return r;
2100
2101         destroy_async_on_interface(ps,
2102                                    intf->altsetting[0].desc.bInterfaceNumber);
2103
2104         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2105         kfree(eps);
2106         return r;
2107 }
2108
2109 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2110 {
2111         unsigned num_eps;
2112         struct usb_host_endpoint **eps;
2113         struct usb_interface *intf;
2114         int r;
2115
2116         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2117         if (r)
2118                 return r;
2119
2120         destroy_async_on_interface(ps,
2121                                    intf->altsetting[0].desc.bInterfaceNumber);
2122
2123         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2124         kfree(eps);
2125         return r;
2126 }
2127
2128 /*
2129  * NOTE:  All requests here that have interface numbers as parameters
2130  * are assuming that somehow the configuration has been prevented from
2131  * changing.  But there's no mechanism to ensure that...
2132  */
2133 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2134                                 void __user *p)
2135 {
2136         struct usb_dev_state *ps = file->private_data;
2137         struct inode *inode = file_inode(file);
2138         struct usb_device *dev = ps->dev;
2139         int ret = -ENOTTY;
2140
2141         if (!(file->f_mode & FMODE_WRITE))
2142                 return -EPERM;
2143
2144         usb_lock_device(dev);
2145
2146         /* Reap operations are allowed even after disconnection */
2147         switch (cmd) {
2148         case USBDEVFS_REAPURB:
2149                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2150                 ret = proc_reapurb(ps, p);
2151                 goto done;
2152
2153         case USBDEVFS_REAPURBNDELAY:
2154                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2155                 ret = proc_reapurbnonblock(ps, p);
2156                 goto done;
2157
2158 #ifdef CONFIG_COMPAT
2159         case USBDEVFS_REAPURB32:
2160                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2161                 ret = proc_reapurb_compat(ps, p);
2162                 goto done;
2163
2164         case USBDEVFS_REAPURBNDELAY32:
2165                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2166                 ret = proc_reapurbnonblock_compat(ps, p);
2167                 goto done;
2168 #endif
2169         }
2170
2171         if (!connected(ps)) {
2172                 usb_unlock_device(dev);
2173                 return -ENODEV;
2174         }
2175
2176         switch (cmd) {
2177         case USBDEVFS_CONTROL:
2178                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2179                 ret = proc_control(ps, p);
2180                 if (ret >= 0)
2181                         inode->i_mtime = CURRENT_TIME;
2182                 break;
2183
2184         case USBDEVFS_BULK:
2185                 snoop(&dev->dev, "%s: BULK\n", __func__);
2186                 ret = proc_bulk(ps, p);
2187                 if (ret >= 0)
2188                         inode->i_mtime = CURRENT_TIME;
2189                 break;
2190
2191         case USBDEVFS_RESETEP:
2192                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2193                 ret = proc_resetep(ps, p);
2194                 if (ret >= 0)
2195                         inode->i_mtime = CURRENT_TIME;
2196                 break;
2197
2198         case USBDEVFS_RESET:
2199                 snoop(&dev->dev, "%s: RESET\n", __func__);
2200                 ret = proc_resetdevice(ps);
2201                 break;
2202
2203         case USBDEVFS_CLEAR_HALT:
2204                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2205                 ret = proc_clearhalt(ps, p);
2206                 if (ret >= 0)
2207                         inode->i_mtime = CURRENT_TIME;
2208                 break;
2209
2210         case USBDEVFS_GETDRIVER:
2211                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2212                 ret = proc_getdriver(ps, p);
2213                 break;
2214
2215         case USBDEVFS_CONNECTINFO:
2216                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2217                 ret = proc_connectinfo(ps, p);
2218                 break;
2219
2220         case USBDEVFS_SETINTERFACE:
2221                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2222                 ret = proc_setintf(ps, p);
2223                 break;
2224
2225         case USBDEVFS_SETCONFIGURATION:
2226                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2227                 ret = proc_setconfig(ps, p);
2228                 break;
2229
2230         case USBDEVFS_SUBMITURB:
2231                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2232                 ret = proc_submiturb(ps, p);
2233                 if (ret >= 0)
2234                         inode->i_mtime = CURRENT_TIME;
2235                 break;
2236
2237 #ifdef CONFIG_COMPAT
2238         case USBDEVFS_CONTROL32:
2239                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2240                 ret = proc_control_compat(ps, p);
2241                 if (ret >= 0)
2242                         inode->i_mtime = CURRENT_TIME;
2243                 break;
2244
2245         case USBDEVFS_BULK32:
2246                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2247                 ret = proc_bulk_compat(ps, p);
2248                 if (ret >= 0)
2249                         inode->i_mtime = CURRENT_TIME;
2250                 break;
2251
2252         case USBDEVFS_DISCSIGNAL32:
2253                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2254                 ret = proc_disconnectsignal_compat(ps, p);
2255                 break;
2256
2257         case USBDEVFS_SUBMITURB32:
2258                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2259                 ret = proc_submiturb_compat(ps, p);
2260                 if (ret >= 0)
2261                         inode->i_mtime = CURRENT_TIME;
2262                 break;
2263
2264         case USBDEVFS_IOCTL32:
2265                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2266                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2267                 break;
2268 #endif
2269
2270         case USBDEVFS_DISCARDURB:
2271                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2272                 ret = proc_unlinkurb(ps, p);
2273                 break;
2274
2275         case USBDEVFS_DISCSIGNAL:
2276                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2277                 ret = proc_disconnectsignal(ps, p);
2278                 break;
2279
2280         case USBDEVFS_CLAIMINTERFACE:
2281                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2282                 ret = proc_claiminterface(ps, p);
2283                 break;
2284
2285         case USBDEVFS_RELEASEINTERFACE:
2286                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2287                 ret = proc_releaseinterface(ps, p);
2288                 break;
2289
2290         case USBDEVFS_IOCTL:
2291                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2292                 ret = proc_ioctl_default(ps, p);
2293                 break;
2294
2295         case USBDEVFS_CLAIM_PORT:
2296                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2297                 ret = proc_claim_port(ps, p);
2298                 break;
2299
2300         case USBDEVFS_RELEASE_PORT:
2301                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2302                 ret = proc_release_port(ps, p);
2303                 break;
2304         case USBDEVFS_GET_CAPABILITIES:
2305                 ret = proc_get_capabilities(ps, p);
2306                 break;
2307         case USBDEVFS_DISCONNECT_CLAIM:
2308                 ret = proc_disconnect_claim(ps, p);
2309                 break;
2310         case USBDEVFS_ALLOC_STREAMS:
2311                 ret = proc_alloc_streams(ps, p);
2312                 break;
2313         case USBDEVFS_FREE_STREAMS:
2314                 ret = proc_free_streams(ps, p);
2315                 break;
2316         }
2317
2318  done:
2319         usb_unlock_device(dev);
2320         if (ret >= 0)
2321                 inode->i_atime = CURRENT_TIME;
2322         return ret;
2323 }
2324
2325 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2326                         unsigned long arg)
2327 {
2328         int ret;
2329
2330         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2331
2332         return ret;
2333 }
2334
2335 #ifdef CONFIG_COMPAT
2336 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2337                         unsigned long arg)
2338 {
2339         int ret;
2340
2341         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2342
2343         return ret;
2344 }
2345 #endif
2346
2347 /* No kernel lock - fine */
2348 static unsigned int usbdev_poll(struct file *file,
2349                                 struct poll_table_struct *wait)
2350 {
2351         struct usb_dev_state *ps = file->private_data;
2352         unsigned int mask = 0;
2353
2354         poll_wait(file, &ps->wait, wait);
2355         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2356                 mask |= POLLOUT | POLLWRNORM;
2357         if (!connected(ps))
2358                 mask |= POLLERR | POLLHUP;
2359         return mask;
2360 }
2361
2362 const struct file_operations usbdev_file_operations = {
2363         .owner =          THIS_MODULE,
2364         .llseek =         usbdev_lseek,
2365         .read =           usbdev_read,
2366         .poll =           usbdev_poll,
2367         .unlocked_ioctl = usbdev_ioctl,
2368 #ifdef CONFIG_COMPAT
2369         .compat_ioctl =   usbdev_compat_ioctl,
2370 #endif
2371         .open =           usbdev_open,
2372         .release =        usbdev_release,
2373 };
2374
2375 static void usbdev_remove(struct usb_device *udev)
2376 {
2377         struct usb_dev_state *ps;
2378         struct siginfo sinfo;
2379
2380         while (!list_empty(&udev->filelist)) {
2381                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2382                 destroy_all_async(ps);
2383                 wake_up_all(&ps->wait);
2384                 list_del_init(&ps->list);
2385                 if (ps->discsignr) {
2386                         memset(&sinfo, 0, sizeof(sinfo));
2387                         sinfo.si_signo = ps->discsignr;
2388                         sinfo.si_errno = EPIPE;
2389                         sinfo.si_code = SI_ASYNCIO;
2390                         sinfo.si_addr = ps->disccontext;
2391                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2392                                         ps->disc_pid, ps->cred, ps->secid);
2393                 }
2394         }
2395 }
2396
2397 static int usbdev_notify(struct notifier_block *self,
2398                                unsigned long action, void *dev)
2399 {
2400         switch (action) {
2401         case USB_DEVICE_ADD:
2402                 break;
2403         case USB_DEVICE_REMOVE:
2404                 usbdev_remove(dev);
2405                 break;
2406         }
2407         return NOTIFY_OK;
2408 }
2409
2410 static struct notifier_block usbdev_nb = {
2411         .notifier_call =        usbdev_notify,
2412 };
2413
2414 static struct cdev usb_device_cdev;
2415
2416 int __init usb_devio_init(void)
2417 {
2418         int retval;
2419
2420         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2421                                         "usb_device");
2422         if (retval) {
2423                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2424                 goto out;
2425         }
2426         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2427         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2428         if (retval) {
2429                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2430                        USB_DEVICE_MAJOR);
2431                 goto error_cdev;
2432         }
2433         usb_register_notify(&usbdev_nb);
2434 out:
2435         return retval;
2436
2437 error_cdev:
2438         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2439         goto out;
2440 }
2441
2442 void usb_devio_cleanup(void)
2443 {
2444         usb_unregister_notify(&usbdev_nb);
2445         cdev_del(&usb_device_cdev);
2446         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2447 }