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 ([email protected])
   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 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 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 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 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 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 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 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 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 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 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                 sinfo.si_signo = as->signr;
 505                 sinfo.si_errno = as->status;
 506                 sinfo.si_code = SI_ASYNCIO;
 507                 sinfo.si_addr = as->userurb;
 508                 pid = get_pid(as->pid);
 509                 cred = get_cred(as->cred);
 510                 secid = as->secid;
 511         }
 512         snoop(&urb->dev->dev, "urb complete\n");
 513         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 514                         as->status, COMPLETE, NULL, 0);
 515         if ((urb->transfer_flags & URB_DIR_MASK) == USB_DIR_IN)
 516                 snoop_urb_data(urb, urb->actual_length);
 517
 518         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 519                         as->status != -ENOENT)
 520                 cancel_bulk_urbs(ps, as->bulk_addr);
 521         spin_unlock(&ps->lock);
 522
 523         if (signr) {
 524                 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
 525                 put_pid(pid);
 526                 put_cred(cred);
 527         }
 528
 529         wake_up(&ps->wait);
 530 }
 531
 532 static void destroy_async(struct dev_state *ps, struct list_head *list)
 533 {
 534         struct urb *urb;
 535         struct async *as;
 536         unsigned long flags;
 537
 538         spin_lock_irqsave(&ps->lock, flags);
 539         while (!list_empty(list)) {
 540                 as = list_entry(list->next, struct async, asynclist);
 541                 list_del_init(&as->asynclist);
 542                 urb = as->urb;
 543                 usb_get_urb(urb);
 544
 545                 /* drop the spinlock so the completion handler can run */
 546                 spin_unlock_irqrestore(&ps->lock, flags);
 547                 usb_kill_urb(urb);
 548                 usb_put_urb(urb);
 549                 spin_lock_irqsave(&ps->lock, flags);
 550         }
 551         spin_unlock_irqrestore(&ps->lock, flags);
 552 }
 553
 554 static void destroy_async_on_interface(struct dev_state *ps,
 555                                        unsigned int ifnum)
 556 {
 557         struct list_head *p, *q, hitlist;
 558         unsigned long flags;
 559
 560         INIT_LIST_HEAD(&hitlist);
 561         spin_lock_irqsave(&ps->lock, flags);
 562         list_for_each_safe(p, q, &ps->async_pending)
 563                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 564                         list_move_tail(p, &hitlist);
 565         spin_unlock_irqrestore(&ps->lock, flags);
 566         destroy_async(ps, &hitlist);
 567 }
 568
 569 static void destroy_all_async(struct dev_state *ps)
 570 {
 571         destroy_async(ps, &ps->async_pending);
 572 }
 573
 574 /*
 575  * interface claims are made only at the request of user level code,
 576  * which can also release them (explicitly or by closing files).
 577  * they're also undone when devices disconnect.
 578  */
 579
 580 static int driver_probe(struct usb_interface *intf,
 581                         const struct usb_device_id *id)
 582 {
 583         return -ENODEV;
 584 }
 585
 586 static void driver_disconnect(struct usb_interface *intf)
 587 {
 588         struct dev_state *ps = usb_get_intfdata(intf);
 589         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 590
 591         if (!ps)
 592                 return;
 593
 594         /* NOTE:  this relies on usbcore having canceled and completed
 595          * all pending I/O requests; 2.6 does that.
 596          */
 597
 598         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 599                 clear_bit(ifnum, &ps->ifclaimed);
 600         else
 601                 dev_warn(&intf->dev, "interface number %u out of range\n",
 602                          ifnum);
 603
 604         usb_set_intfdata(intf, NULL);
 605
 606         /* force async requests to complete */
 607         destroy_async_on_interface(ps, ifnum);
 608 }
 609
 610 /* The following routines are merely placeholders.  There is no way
 611  * to inform a user task about suspend or resumes.
 612  */
 613 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 614 {
 615         return 0;
 616 }
 617
 618 static int driver_resume(struct usb_interface *intf)
 619 {
 620         return 0;
 621 }
 622
 623 struct usb_driver usbfs_driver = {
 624         .name =         "usbfs",
 625         .probe =        driver_probe,
 626         .disconnect =   driver_disconnect,
 627         .suspend =      driver_suspend,
 628         .resume =       driver_resume,
 629 };
 630
 631 static int claimintf(struct dev_state *ps, unsigned int ifnum)
 632 {
 633         struct usb_device *dev = ps->dev;
 634         struct usb_interface *intf;
 635         int err;
 636
 637         if (ifnum >= 8*sizeof(ps->ifclaimed))
 638                 return -EINVAL;
 639         /* already claimed */
 640         if (test_bit(ifnum, &ps->ifclaimed))
 641                 return 0;
 642
 643         intf = usb_ifnum_to_if(dev, ifnum);
 644         if (!intf)
 645                 err = -ENOENT;
 646         else
 647                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 648         if (err == 0)
 649                 set_bit(ifnum, &ps->ifclaimed);
 650         return err;
 651 }
 652
 653 static int releaseintf(struct dev_state *ps, unsigned int ifnum)
 654 {
 655         struct usb_device *dev;
 656         struct usb_interface *intf;
 657         int err;
 658
 659         err = -EINVAL;
 660         if (ifnum >= 8*sizeof(ps->ifclaimed))
 661                 return err;
 662         dev = ps->dev;
 663         intf = usb_ifnum_to_if(dev, ifnum);
 664         if (!intf)
 665                 err = -ENOENT;
 666         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 667                 usb_driver_release_interface(&usbfs_driver, intf);
 668                 err = 0;
 669         }
 670         return err;
 671 }
 672
 673 static int checkintf(struct dev_state *ps, unsigned int ifnum)
 674 {
 675         if (ps->dev->state != USB_STATE_CONFIGURED)
 676                 return -EHOSTUNREACH;
 677         if (ifnum >= 8*sizeof(ps->ifclaimed))
 678                 return -EINVAL;
 679         if (test_bit(ifnum, &ps->ifclaimed))
 680                 return 0;
 681         /* if not yet claimed, claim it for the driver */
 682         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 683                  "interface %u before use\n", task_pid_nr(current),
 684                  current->comm, ifnum);
 685         return claimintf(ps, ifnum);
 686 }
 687
 688 static int findintfep(struct usb_device *dev, unsigned int ep)
 689 {
 690         unsigned int i, j, e;
 691         struct usb_interface *intf;
 692         struct usb_host_interface *alts;
 693         struct usb_endpoint_descriptor *endpt;
 694
 695         if (ep & ~(USB_DIR_IN|0xf))
 696                 return -EINVAL;
 697         if (!dev->actconfig)
 698                 return -ESRCH;
 699         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 700                 intf = dev->actconfig->interface[i];
 701                 for (j = 0; j < intf->num_altsetting; j++) {
 702                         alts = &intf->altsetting[j];
 703                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 704                                 endpt = &alts->endpoint[e].desc;
 705                                 if (endpt->bEndpointAddress == ep)
 706                                         return alts->desc.bInterfaceNumber;
 707                         }
 708                 }
 709         }
 710         return -ENOENT;
 711 }
 712
 713 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype,
 714                            unsigned int request, unsigned int index)
 715 {
 716         int ret = 0;
 717         struct usb_host_interface *alt_setting;
 718
 719         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 720          && ps->dev->state != USB_STATE_ADDRESS
 721          && ps->dev->state != USB_STATE_CONFIGURED)
 722                 return -EHOSTUNREACH;
 723         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 724                 return 0;
 725
 726         /*
 727          * check for the special corner case 'get_device_id' in the printer
 728          * class specification, which we always want to allow as it is used
 729          * to query things like ink level, etc.
 730          */
 731         if (requesttype == 0xa1 && request == 0) {
 732                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 733                                                    index >> 8, index & 0xff);
 734                 if (alt_setting
 735                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 736                         return 0;
 737         }
 738
 739         index &= 0xff;
 740         switch (requesttype & USB_RECIP_MASK) {
 741         case USB_RECIP_ENDPOINT:
 742                 if ((index & ~USB_DIR_IN) == 0)
 743                         return 0;
 744                 ret = findintfep(ps->dev, index);
 745                 if (ret < 0) {
 746                         /*
 747                          * Some not fully compliant Win apps seem to get
 748                          * index wrong and have the endpoint number here
 749                          * rather than the endpoint address (with the
 750                          * correct direction). Win does let this through,
 751                          * so we'll not reject it here but leave it to
 752                          * the device to not break KVM. But we warn.
 753                          */
 754                         ret = findintfep(ps->dev, index ^ 0x80);
 755                         if (ret >= 0)
 756                                 dev_info(&ps->dev->dev,
 757                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 758                                         __func__, task_pid_nr(current),
 759                                         current->comm, index, index ^ 0x80);
 760                 }
 761                 if (ret >= 0)
 762                         ret = checkintf(ps, ret);
 763                 break;
 764
 765         case USB_RECIP_INTERFACE:
 766                 ret = checkintf(ps, index);
 767                 break;
 768         }
 769         return ret;
 770 }
 771
 772 static int match_devt(struct device *dev, void *data)
 773 {
 774         return dev->devt == (dev_t) (unsigned long) data;
 775 }
 776
 777 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 778 {
 779         struct device *dev;
 780
 781         dev = bus_find_device(&usb_bus_type, NULL,
 782                               (void *) (unsigned long) devt, match_devt);
 783         if (!dev)
 784                 return NULL;
 785         return container_of(dev, struct usb_device, dev);
 786 }
 787
 788 /*
 789  * file operations
 790  */
 791 static int usbdev_open(struct inode *inode, struct file *file)
 792 {
 793         struct usb_device *dev = NULL;
 794         struct dev_state *ps;
 795         int ret;
 796
 797         ret = -ENOMEM;
 798         ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL);
 799         if (!ps)
 800                 goto out_free_ps;
 801
 802         ret = -ENODEV;
 803
 804         /* Protect against simultaneous removal or release */
 805         mutex_lock(&usbfs_mutex);
 806
 807         /* usbdev device-node */
 808         if (imajor(inode) == USB_DEVICE_MAJOR)
 809                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 810
 811         mutex_unlock(&usbfs_mutex);
 812
 813         if (!dev)
 814                 goto out_free_ps;
 815
 816         usb_lock_device(dev);
 817         if (dev->state == USB_STATE_NOTATTACHED)
 818                 goto out_unlock_device;
 819
 820         ret = usb_autoresume_device(dev);
 821         if (ret)
 822                 goto out_unlock_device;
 823
 824         ps->dev = dev;
 825         ps->file = file;
 826         spin_lock_init(&ps->lock);
 827         INIT_LIST_HEAD(&ps->list);
 828         INIT_LIST_HEAD(&ps->async_pending);
 829         INIT_LIST_HEAD(&ps->async_completed);
 830         init_waitqueue_head(&ps->wait);
 831         ps->discsignr = 0;
 832         ps->disc_pid = get_pid(task_pid(current));
 833         ps->cred = get_current_cred();
 834         ps->disccontext = NULL;
 835         ps->ifclaimed = 0;
 836         security_task_getsecid(current, &ps->secid);
 837         smp_wmb();
 838         list_add_tail(&ps->list, &dev->filelist);
 839         file->private_data = ps;
 840         usb_unlock_device(dev);
 841         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 842                         current->comm);
 843         return ret;
 844
 845  out_unlock_device:
 846         usb_unlock_device(dev);
 847         usb_put_dev(dev);
 848  out_free_ps:
 849         kfree(ps);
 850         return ret;
 851 }
 852
 853 static int usbdev_release(struct inode *inode, struct file *file)
 854 {
 855         struct dev_state *ps = file->private_data;
 856         struct usb_device *dev = ps->dev;
 857         unsigned int ifnum;
 858         struct async *as;
 859
 860         usb_lock_device(dev);
 861         usb_hub_release_all_ports(dev, ps);
 862
 863         list_del_init(&ps->list);
 864
 865         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 866                         ifnum++) {
 867                 if (test_bit(ifnum, &ps->ifclaimed))
 868                         releaseintf(ps, ifnum);
 869         }
 870         destroy_all_async(ps);
 871         usb_autosuspend_device(dev);
 872         usb_unlock_device(dev);
 873         usb_put_dev(dev);
 874         put_pid(ps->disc_pid);
 875         put_cred(ps->cred);
 876
 877         as = async_getcompleted(ps);
 878         while (as) {
 879                 free_async(as);
 880                 as = async_getcompleted(ps);
 881         }
 882         kfree(ps);
 883         return 0;
 884 }
 885
 886 static int proc_control(struct dev_state *ps, void __user *arg)
 887 {
 888         struct usb_device *dev = ps->dev;
 889         struct usbdevfs_ctrltransfer ctrl;
 890         unsigned int tmo;
 891         unsigned char *tbuf;
 892         unsigned wLength;
 893         int i, pipe, ret;
 894
 895         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 896                 return -EFAULT;
 897         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
 898                               ctrl.wIndex);
 899         if (ret)
 900                 return ret;
 901         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 902         if (wLength > PAGE_SIZE)
 903                 return -EINVAL;
 904         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
 905                         sizeof(struct usb_ctrlrequest));
 906         if (ret)
 907                 return ret;
 908         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 909         if (!tbuf) {
 910                 ret = -ENOMEM;
 911                 goto done;
 912         }
 913         tmo = ctrl.timeout;
 914         snoop(&dev->dev, "control urb: bRequestType=%02x "
 915                 "bRequest=%02x wValue=%04x "
 916                 "wIndex=%04x wLength=%04x\n",
 917                 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
 918                 ctrl.wIndex, ctrl.wLength);
 919         if (ctrl.bRequestType & 0x80) {
 920                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
 921                                                ctrl.wLength)) {
 922                         ret = -EINVAL;
 923                         goto done;
 924                 }
 925                 pipe = usb_rcvctrlpipe(dev, 0);
 926                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
 927
 928                 usb_unlock_device(dev);
 929                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
 930                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 931                                     tbuf, ctrl.wLength, tmo);
 932                 usb_lock_device(dev);
 933                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
 934                           tbuf, max(i, 0));
 935                 if ((i > 0) && ctrl.wLength) {
 936                         if (copy_to_user(ctrl.data, tbuf, i)) {
 937                                 ret = -EFAULT;
 938                                 goto done;
 939                         }
 940                 }
 941         } else {
 942                 if (ctrl.wLength) {
 943                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
 944                                 ret = -EFAULT;
 945                                 goto done;
 946                         }
 947                 }
 948                 pipe = usb_sndctrlpipe(dev, 0);
 949                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
 950                         tbuf, ctrl.wLength);
 951
 952                 usb_unlock_device(dev);
 953                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
 954                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
 955                                     tbuf, ctrl.wLength, tmo);
 956                 usb_lock_device(dev);
 957                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
 958         }
 959         if (i < 0 && i != -EPIPE) {
 960                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
 961                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
 962                            current->comm, ctrl.bRequestType, ctrl.bRequest,
 963                            ctrl.wLength, i);
 964         }
 965         ret = i;
 966  done:
 967         free_page((unsigned long) tbuf);
 968         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
 969                         sizeof(struct usb_ctrlrequest));
 970         return ret;
 971 }
 972
 973 static int proc_bulk(struct dev_state *ps, void __user *arg)
 974 {
 975         struct usb_device *dev = ps->dev;
 976         struct usbdevfs_bulktransfer bulk;
 977         unsigned int tmo, len1, pipe;
 978         int len2;
 979         unsigned char *tbuf;
 980         int i, ret;
 981
 982         if (copy_from_user(&bulk, arg, sizeof(bulk)))
 983                 return -EFAULT;
 984         ret = findintfep(ps->dev, bulk.ep);
 985         if (ret < 0)
 986                 return ret;
 987         ret = checkintf(ps, ret);
 988         if (ret)
 989                 return ret;
 990         if (bulk.ep & USB_DIR_IN)
 991                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
 992         else
 993                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
 994         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
 995                 return -EINVAL;
 996         len1 = bulk.len;
 997         if (len1 >= USBFS_XFER_MAX)
 998                 return -EINVAL;
 999         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1000         if (ret)
1001                 return ret;
1002         if (!(tbuf = kmalloc(len1, GFP_KERNEL))) {
1003                 ret = -ENOMEM;
1004                 goto done;
1005         }
1006         tmo = bulk.timeout;
1007         if (bulk.ep & 0x80) {
1008                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1009                         ret = -EINVAL;
1010                         goto done;
1011                 }
1012                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1013
1014                 usb_unlock_device(dev);
1015                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1016                 usb_lock_device(dev);
1017                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1018
1019                 if (!i && len2) {
1020                         if (copy_to_user(bulk.data, tbuf, len2)) {
1021                                 ret = -EFAULT;
1022                                 goto done;
1023                         }
1024                 }
1025         } else {
1026                 if (len1) {
1027                         if (copy_from_user(tbuf, bulk.data, len1)) {
1028                                 ret = -EFAULT;
1029                                 goto done;
1030                         }
1031                 }
1032                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1033
1034                 usb_unlock_device(dev);
1035                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1036                 usb_lock_device(dev);
1037                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1038         }
1039         ret = (i < 0 ? i : len2);
1040  done:
1041         kfree(tbuf);
1042         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1043         return ret;
1044 }
1045
1046 static int proc_resetep(struct dev_state *ps, void __user *arg)
1047 {
1048         unsigned int ep;
1049         int ret;
1050
1051         if (get_user(ep, (unsigned int __user *)arg))
1052                 return -EFAULT;
1053         ret = findintfep(ps->dev, ep);
1054         if (ret < 0)
1055                 return ret;
1056         ret = checkintf(ps, ret);
1057         if (ret)
1058                 return ret;
1059         usb_reset_endpoint(ps->dev, ep);
1060         return 0;
1061 }
1062
1063 static int proc_clearhalt(struct dev_state *ps, void __user *arg)
1064 {
1065         unsigned int ep;
1066         int pipe;
1067         int ret;
1068
1069         if (get_user(ep, (unsigned int __user *)arg))
1070                 return -EFAULT;
1071         ret = findintfep(ps->dev, ep);
1072         if (ret < 0)
1073                 return ret;
1074         ret = checkintf(ps, ret);
1075         if (ret)
1076                 return ret;
1077         if (ep & USB_DIR_IN)
1078                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1079         else
1080                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1081
1082         return usb_clear_halt(ps->dev, pipe);
1083 }
1084
1085 static int proc_getdriver(struct dev_state *ps, void __user *arg)
1086 {
1087         struct usbdevfs_getdriver gd;
1088         struct usb_interface *intf;
1089         int ret;
1090
1091         if (copy_from_user(&gd, arg, sizeof(gd)))
1092                 return -EFAULT;
1093         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1094         if (!intf || !intf->dev.driver)
1095                 ret = -ENODATA;
1096         else {
1097                 strlcpy(gd.driver, intf->dev.driver->name,
1098                                 sizeof(gd.driver));
1099                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1100         }
1101         return ret;
1102 }
1103
1104 static int proc_connectinfo(struct dev_state *ps, void __user *arg)
1105 {
1106         struct usbdevfs_connectinfo ci = {
1107                 .devnum = ps->dev->devnum,
1108                 .slow = ps->dev->speed == USB_SPEED_LOW
1109         };
1110
1111         if (copy_to_user(arg, &ci, sizeof(ci)))
1112                 return -EFAULT;
1113         return 0;
1114 }
1115
1116 static int proc_resetdevice(struct dev_state *ps)
1117 {
1118         return usb_reset_device(ps->dev);
1119 }
1120
1121 static int proc_setintf(struct dev_state *ps, void __user *arg)
1122 {
1123         struct usbdevfs_setinterface setintf;
1124         int ret;
1125
1126         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1127                 return -EFAULT;
1128         if ((ret = checkintf(ps, setintf.interface)))
1129                 return ret;
1130         return usb_set_interface(ps->dev, setintf.interface,
1131                         setintf.altsetting);
1132 }
1133
1134 static int proc_setconfig(struct dev_state *ps, void __user *arg)
1135 {
1136         int u;
1137         int status = 0;
1138         struct usb_host_config *actconfig;
1139
1140         if (get_user(u, (int __user *)arg))
1141                 return -EFAULT;
1142
1143         actconfig = ps->dev->actconfig;
1144
1145         /* Don't touch the device if any interfaces are claimed.
1146          * It could interfere with other drivers' operations, and if
1147          * an interface is claimed by usbfs it could easily deadlock.
1148          */
1149         if (actconfig) {
1150                 int i;
1151
1152                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1153                         if (usb_interface_claimed(actconfig->interface[i])) {
1154                                 dev_warn(&ps->dev->dev,
1155                                         "usbfs: interface %d claimed by %s "
1156                                         "while '%s' sets config #%d\n",
1157                                         actconfig->interface[i]
1158                                                 ->cur_altsetting
1159                                                 ->desc.bInterfaceNumber,
1160                                         actconfig->interface[i]
1161                                                 ->dev.driver->name,
1162                                         current->comm, u);
1163                                 status = -EBUSY;
1164                                 break;
1165                         }
1166                 }
1167         }
1168
1169         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1170          * so avoid usb_set_configuration()'s kick to sysfs
1171          */
1172         if (status == 0) {
1173                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1174                         status = usb_reset_configuration(ps->dev);
1175                 else
1176                         status = usb_set_configuration(ps->dev, u);
1177         }
1178
1179         return status;
1180 }
1181
1182 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb,
1183                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1184                         void __user *arg)
1185 {
1186         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1187         struct usb_host_endpoint *ep;
1188         struct async *as = NULL;
1189         struct usb_ctrlrequest *dr = NULL;
1190         unsigned int u, totlen, isofrmlen;
1191         int i, ret, is_in, num_sgs = 0, ifnum = -1;
1192         void *buf;
1193
1194         if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP |
1195                                 USBDEVFS_URB_SHORT_NOT_OK |
1196                                 USBDEVFS_URB_BULK_CONTINUATION |
1197                                 USBDEVFS_URB_NO_FSBR |
1198                                 USBDEVFS_URB_ZERO_PACKET |
1199                                 USBDEVFS_URB_NO_INTERRUPT))
1200                 return -EINVAL;
1201         if (uurb->buffer_length > 0 && !uurb->buffer)
1202                 return -EINVAL;
1203         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1204             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1205                 ifnum = findintfep(ps->dev, uurb->endpoint);
1206                 if (ifnum < 0)
1207                         return ifnum;
1208                 ret = checkintf(ps, ifnum);
1209                 if (ret)
1210                         return ret;
1211         }
1212         if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) {
1213                 is_in = 1;
1214                 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1215         } else {
1216                 is_in = 0;
1217                 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK];
1218         }
1219         if (!ep)
1220                 return -ENOENT;
1221
1222         u = 0;
1223         switch(uurb->type) {
1224         case USBDEVFS_URB_TYPE_CONTROL:
1225                 if (!usb_endpoint_xfer_control(&ep->desc))
1226                         return -EINVAL;
1227                 /* min 8 byte setup packet */
1228                 if (uurb->buffer_length < 8)
1229                         return -EINVAL;
1230                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1231                 if (!dr)
1232                         return -ENOMEM;
1233                 if (copy_from_user(dr, uurb->buffer, 8)) {
1234                         ret = -EFAULT;
1235                         goto error;
1236                 }
1237                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1238                         ret = -EINVAL;
1239                         goto error;
1240                 }
1241                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1242                                       le16_to_cpup(&dr->wIndex));
1243                 if (ret)
1244                         goto error;
1245                 uurb->number_of_packets = 0;
1246                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1247                 uurb->buffer += 8;
1248                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1249                         is_in = 1;
1250                         uurb->endpoint |= USB_DIR_IN;
1251                 } else {
1252                         is_in = 0;
1253                         uurb->endpoint &= ~USB_DIR_IN;
1254                 }
1255                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1256                         "bRequest=%02x wValue=%04x "
1257                         "wIndex=%04x wLength=%04x\n",
1258                         dr->bRequestType, dr->bRequest,
1259                         __le16_to_cpup(&dr->wValue),
1260                         __le16_to_cpup(&dr->wIndex),
1261                         __le16_to_cpup(&dr->wLength));
1262                 u = sizeof(struct usb_ctrlrequest);
1263                 break;
1264
1265         case USBDEVFS_URB_TYPE_BULK:
1266                 switch (usb_endpoint_type(&ep->desc)) {
1267                 case USB_ENDPOINT_XFER_CONTROL:
1268                 case USB_ENDPOINT_XFER_ISOC:
1269                         return -EINVAL;
1270                 case USB_ENDPOINT_XFER_INT:
1271                         /* allow single-shot interrupt transfers */
1272                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1273                         goto interrupt_urb;
1274                 }
1275                 uurb->number_of_packets = 0;
1276                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1277                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1278                         num_sgs = 0;
1279                 break;
1280
1281         case USBDEVFS_URB_TYPE_INTERRUPT:
1282                 if (!usb_endpoint_xfer_int(&ep->desc))
1283                         return -EINVAL;
1284  interrupt_urb:
1285                 uurb->number_of_packets = 0;
1286                 break;
1287
1288         case USBDEVFS_URB_TYPE_ISO:
1289                 /* arbitrary limit */
1290                 if (uurb->number_of_packets < 1 ||
1291                     uurb->number_of_packets > 128)
1292                         return -EINVAL;
1293                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1294                         return -EINVAL;
1295                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1296                                    uurb->number_of_packets;
1297                 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
1298                         return -ENOMEM;
1299                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1300                         ret = -EFAULT;
1301                         goto error;
1302                 }
1303                 for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1304                         /*
1305                          * arbitrary limit need for USB 3.0
1306                          * bMaxBurst (0~15 allowed, 1~16 packets)
1307                          * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1308                          * sizemax: 1024 * 16 * 3 = 49152
1309                          */
1310                         if (isopkt[u].length > 49152) {
1311                                 ret = -EINVAL;
1312                                 goto error;
1313                         }
1314                         totlen += isopkt[u].length;
1315                 }
1316                 u *= sizeof(struct usb_iso_packet_descriptor);
1317                 uurb->buffer_length = totlen;
1318                 break;
1319
1320         default:
1321                 return -EINVAL;
1322         }
1323
1324         if (uurb->buffer_length >= USBFS_XFER_MAX) {
1325                 ret = -EINVAL;
1326                 goto error;
1327         }
1328         if (uurb->buffer_length > 0 &&
1329                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1330                                 uurb->buffer, uurb->buffer_length)) {
1331                 ret = -EFAULT;
1332                 goto error;
1333         }
1334         as = alloc_async(uurb->number_of_packets);
1335         if (!as) {
1336                 ret = -ENOMEM;
1337                 goto error;
1338         }
1339
1340         u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1341              num_sgs * sizeof(struct scatterlist);
1342         ret = usbfs_increase_memory_usage(u);
1343         if (ret)
1344                 goto error;
1345         as->mem_usage = u;
1346
1347         if (num_sgs) {
1348                 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1349                                       GFP_KERNEL);
1350                 if (!as->urb->sg) {
1351                         ret = -ENOMEM;
1352                         goto error;
1353                 }
1354                 as->urb->num_sgs = num_sgs;
1355                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1356
1357                 totlen = uurb->buffer_length;
1358                 for (i = 0; i < as->urb->num_sgs; i++) {
1359                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1360                         buf = kmalloc(u, GFP_KERNEL);
1361                         if (!buf) {
1362                                 ret = -ENOMEM;
1363                                 goto error;
1364                         }
1365                         sg_set_buf(&as->urb->sg[i], buf, u);
1366
1367                         if (!is_in) {
1368                                 if (copy_from_user(buf, uurb->buffer, u)) {
1369                                         ret = -EFAULT;
1370                                         goto error;
1371                                 }
1372                                 uurb->buffer += u;
1373                         }
1374                         totlen -= u;
1375                 }
1376         } else if (uurb->buffer_length > 0) {
1377                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1378                                 GFP_KERNEL);
1379                 if (!as->urb->transfer_buffer) {
1380                         ret = -ENOMEM;
1381                         goto error;
1382                 }
1383
1384                 if (!is_in) {
1385                         if (copy_from_user(as->urb->transfer_buffer,
1386                                            uurb->buffer,
1387                                            uurb->buffer_length)) {
1388                                 ret = -EFAULT;
1389                                 goto error;
1390                         }
1391                 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1392                         /*
1393                          * Isochronous input data may end up being
1394                          * discontiguous if some of the packets are short.
1395                          * Clear the buffer so that the gaps don't leak
1396                          * kernel data to userspace.
1397                          */
1398                         memset(as->urb->transfer_buffer, 0,
1399                                         uurb->buffer_length);
1400                 }
1401         }
1402         as->urb->dev = ps->dev;
1403         as->urb->pipe = (uurb->type << 30) |
1404                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1405                         (uurb->endpoint & USB_DIR_IN);
1406
1407         /* This tedious sequence is necessary because the URB_* flags
1408          * are internal to the kernel and subject to change, whereas
1409          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1410          */
1411         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1412         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1413                 u |= URB_ISO_ASAP;
1414         if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1415                 u |= URB_SHORT_NOT_OK;
1416         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1417                 u |= URB_NO_FSBR;
1418         if (uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1419                 u |= URB_ZERO_PACKET;
1420         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1421                 u |= URB_NO_INTERRUPT;
1422         as->urb->transfer_flags = u;
1423
1424         as->urb->transfer_buffer_length = uurb->buffer_length;
1425         as->urb->setup_packet = (unsigned char *)dr;
1426         dr = NULL;
1427         as->urb->start_frame = uurb->start_frame;
1428         as->urb->number_of_packets = uurb->number_of_packets;
1429         if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1430                         ps->dev->speed == USB_SPEED_HIGH)
1431                 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);
1432         else
1433                 as->urb->interval = ep->desc.bInterval;
1434         as->urb->context = as;
1435         as->urb->complete = async_completed;
1436         for (totlen = u = 0; u < uurb->number_of_packets; u++) {
1437                 as->urb->iso_frame_desc[u].offset = totlen;
1438                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1439                 totlen += isopkt[u].length;
1440         }
1441         kfree(isopkt);
1442         isopkt = NULL;
1443         as->ps = ps;
1444         as->userurb = arg;
1445         if (is_in && uurb->buffer_length > 0)
1446                 as->userbuffer = uurb->buffer;
1447         else
1448                 as->userbuffer = NULL;
1449         as->signr = uurb->signr;
1450         as->ifnum = ifnum;
1451         as->pid = get_pid(task_pid(current));
1452         as->cred = get_current_cred();
1453         security_task_getsecid(current, &as->secid);
1454         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1455                         as->urb->transfer_buffer_length, 0, SUBMIT,
1456                         NULL, 0);
1457         if (!is_in)
1458                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1459
1460         async_newpending(as);
1461
1462         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1463                 spin_lock_irq(&ps->lock);
1464
1465                 /* Not exactly the endpoint address; the direction bit is
1466                  * shifted to the 0x10 position so that the value will be
1467                  * between 0 and 31.
1468                  */
1469                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1470                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1471                                 >> 3);
1472
1473                 /* If this bulk URB is the start of a new transfer, re-enable
1474                  * the endpoint.  Otherwise mark it as a continuation URB.
1475                  */
1476                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1477                         as->bulk_status = AS_CONTINUATION;
1478                 else
1479                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1480
1481                 /* Don't accept continuation URBs if the endpoint is
1482                  * disabled because of an earlier error.
1483                  */
1484                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1485                         ret = -EREMOTEIO;
1486                 else
1487                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1488                 spin_unlock_irq(&ps->lock);
1489         } else {
1490                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1491         }
1492
1493         if (ret) {
1494                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1495                            "usbfs: usb_submit_urb returned %d\n", ret);
1496                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1497                                 0, ret, COMPLETE, NULL, 0);
1498                 async_removepending(as);
1499                 goto error;
1500         }
1501         return 0;
1502
1503  error:
1504         kfree(isopkt);
1505         kfree(dr);
1506         if (as)
1507                 free_async(as);
1508         return ret;
1509 }
1510
1511 static int proc_submiturb(struct dev_state *ps, void __user *arg)
1512 {
1513         struct usbdevfs_urb uurb;
1514
1515         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1516                 return -EFAULT;
1517
1518         return proc_do_submiturb(ps, &uurb,
1519                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1520                         arg);
1521 }
1522
1523 static int proc_unlinkurb(struct dev_state *ps, void __user *arg)
1524 {
1525         struct urb *urb;
1526         struct async *as;
1527         unsigned long flags;
1528
1529         spin_lock_irqsave(&ps->lock, flags);
1530         as = async_getpending(ps, arg);
1531         if (!as) {
1532                 spin_unlock_irqrestore(&ps->lock, flags);
1533                 return -EINVAL;
1534         }
1535
1536         urb = as->urb;
1537         usb_get_urb(urb);
1538         spin_unlock_irqrestore(&ps->lock, flags);
1539
1540         usb_kill_urb(urb);
1541         usb_put_urb(urb);
1542
1543         return 0;
1544 }
1545
1546 static int processcompl(struct async *as, void __user * __user *arg)
1547 {
1548         struct urb *urb = as->urb;
1549         struct usbdevfs_urb __user *userurb = as->userurb;
1550         void __user *addr = as->userurb;
1551         unsigned int i;
1552
1553         if (as->userbuffer && urb->actual_length) {
1554                 if (copy_urb_data_to_user(as->userbuffer, urb))
1555                         goto err_out;
1556         }
1557         if (put_user(as->status, &userurb->status))
1558                 goto err_out;
1559         if (put_user(urb->actual_length, &userurb->actual_length))
1560                 goto err_out;
1561         if (put_user(urb->error_count, &userurb->error_count))
1562                 goto err_out;
1563
1564         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1565                 for (i = 0; i < urb->number_of_packets; i++) {
1566                         if (put_user(urb->iso_frame_desc[i].actual_length,
1567                                      &userurb->iso_frame_desc[i].actual_length))
1568                                 goto err_out;
1569                         if (put_user(urb->iso_frame_desc[i].status,
1570                                      &userurb->iso_frame_desc[i].status))
1571                                 goto err_out;
1572                 }
1573         }
1574
1575         if (put_user(addr, (void __user * __user *)arg))
1576                 return -EFAULT;
1577         return 0;
1578
1579 err_out:
1580         return -EFAULT;
1581 }
1582
1583 static struct async *reap_as(struct dev_state *ps)
1584 {
1585         DECLARE_WAITQUEUE(wait, current);
1586         struct async *as = NULL;
1587         struct usb_device *dev = ps->dev;
1588
1589         add_wait_queue(&ps->wait, &wait);
1590         for (;;) {
1591                 __set_current_state(TASK_INTERRUPTIBLE);
1592                 as = async_getcompleted(ps);
1593                 if (as)
1594                         break;
1595                 if (signal_pending(current))
1596                         break;
1597                 usb_unlock_device(dev);
1598                 schedule();
1599                 usb_lock_device(dev);
1600         }
1601         remove_wait_queue(&ps->wait, &wait);
1602         set_current_state(TASK_RUNNING);
1603         return as;
1604 }
1605
1606 static int proc_reapurb(struct dev_state *ps, void __user *arg)
1607 {
1608         struct async *as = reap_as(ps);
1609         if (as) {
1610                 int retval = processcompl(as, (void __user * __user *)arg);
1611                 free_async(as);
1612                 return retval;
1613         }
1614         if (signal_pending(current))
1615                 return -EINTR;
1616         return -EIO;
1617 }
1618
1619 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg)
1620 {
1621         int retval;
1622         struct async *as;
1623
1624         as = async_getcompleted(ps);
1625         retval = -EAGAIN;
1626         if (as) {
1627                 retval = processcompl(as, (void __user * __user *)arg);
1628                 free_async(as);
1629         }
1630         return retval;
1631 }
1632
1633 #ifdef CONFIG_COMPAT
1634 static int proc_control_compat(struct dev_state *ps,
1635                                 struct usbdevfs_ctrltransfer32 __user *p32)
1636 {
1637         struct usbdevfs_ctrltransfer __user *p;
1638         __u32 udata;
1639         p = compat_alloc_user_space(sizeof(*p));
1640         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1641             get_user(udata, &p32->data) ||
1642             put_user(compat_ptr(udata), &p->data))
1643                 return -EFAULT;
1644         return proc_control(ps, p);
1645 }
1646
1647 static int proc_bulk_compat(struct dev_state *ps,
1648                         struct usbdevfs_bulktransfer32 __user *p32)
1649 {
1650         struct usbdevfs_bulktransfer __user *p;
1651         compat_uint_t n;
1652         compat_caddr_t addr;
1653
1654         p = compat_alloc_user_space(sizeof(*p));
1655
1656         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1657             get_user(n, &p32->len) || put_user(n, &p->len) ||
1658             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1659             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1660                 return -EFAULT;
1661
1662         return proc_bulk(ps, p);
1663 }
1664 static int proc_disconnectsignal_compat(struct dev_state *ps, void __user *arg)
1665 {
1666         struct usbdevfs_disconnectsignal32 ds;
1667
1668         if (copy_from_user(&ds, arg, sizeof(ds)))
1669                 return -EFAULT;
1670         ps->discsignr = ds.signr;
1671         ps->disccontext = compat_ptr(ds.context);
1672         return 0;
1673 }
1674
1675 static int get_urb32(struct usbdevfs_urb *kurb,
1676                      struct usbdevfs_urb32 __user *uurb)
1677 {
1678         __u32  uptr;
1679         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1680             __get_user(kurb->type, &uurb->type) ||
1681             __get_user(kurb->endpoint, &uurb->endpoint) ||
1682             __get_user(kurb->status, &uurb->status) ||
1683             __get_user(kurb->flags, &uurb->flags) ||
1684             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1685             __get_user(kurb->actual_length, &uurb->actual_length) ||
1686             __get_user(kurb->start_frame, &uurb->start_frame) ||
1687             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1688             __get_user(kurb->error_count, &uurb->error_count) ||
1689             __get_user(kurb->signr, &uurb->signr))
1690                 return -EFAULT;
1691
1692         if (__get_user(uptr, &uurb->buffer))
1693                 return -EFAULT;
1694         kurb->buffer = compat_ptr(uptr);
1695         if (__get_user(uptr, &uurb->usercontext))
1696                 return -EFAULT;
1697         kurb->usercontext = compat_ptr(uptr);
1698
1699         return 0;
1700 }
1701
1702 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg)
1703 {
1704         struct usbdevfs_urb uurb;
1705
1706         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1707                 return -EFAULT;
1708
1709         return proc_do_submiturb(ps, &uurb,
1710                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1711                         arg);
1712 }
1713
1714 static int processcompl_compat(struct async *as, void __user * __user *arg)
1715 {
1716         struct urb *urb = as->urb;
1717         struct usbdevfs_urb32 __user *userurb = as->userurb;
1718         void __user *addr = as->userurb;
1719         unsigned int i;
1720
1721         if (as->userbuffer && urb->actual_length) {
1722                 if (copy_urb_data_to_user(as->userbuffer, urb))
1723                         return -EFAULT;
1724         }
1725         if (put_user(as->status, &userurb->status))
1726                 return -EFAULT;
1727         if (put_user(urb->actual_length, &userurb->actual_length))
1728                 return -EFAULT;
1729         if (put_user(urb->error_count, &userurb->error_count))
1730                 return -EFAULT;
1731
1732         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1733                 for (i = 0; i < urb->number_of_packets; i++) {
1734                         if (put_user(urb->iso_frame_desc[i].actual_length,
1735                                      &userurb->iso_frame_desc[i].actual_length))
1736                                 return -EFAULT;
1737                         if (put_user(urb->iso_frame_desc[i].status,
1738                                      &userurb->iso_frame_desc[i].status))
1739                                 return -EFAULT;
1740                 }
1741         }
1742
1743         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1744                 return -EFAULT;
1745         return 0;
1746 }
1747
1748 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg)
1749 {
1750         struct async *as = reap_as(ps);
1751         if (as) {
1752                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1753                 free_async(as);
1754                 return retval;
1755         }
1756         if (signal_pending(current))
1757                 return -EINTR;
1758         return -EIO;
1759 }
1760
1761 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg)
1762 {
1763         int retval;
1764         struct async *as;
1765
1766         retval = -EAGAIN;
1767         as = async_getcompleted(ps);
1768         if (as) {
1769                 retval = processcompl_compat(as, (void __user * __user *)arg);
1770                 free_async(as);
1771         }
1772         return retval;
1773 }
1774
1775
1776 #endif
1777
1778 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg)
1779 {
1780         struct usbdevfs_disconnectsignal ds;
1781
1782         if (copy_from_user(&ds, arg, sizeof(ds)))
1783                 return -EFAULT;
1784         ps->discsignr = ds.signr;
1785         ps->disccontext = ds.context;
1786         return 0;
1787 }
1788
1789 static int proc_claiminterface(struct dev_state *ps, void __user *arg)
1790 {
1791         unsigned int ifnum;
1792
1793         if (get_user(ifnum, (unsigned int __user *)arg))
1794                 return -EFAULT;
1795         return claimintf(ps, ifnum);
1796 }
1797
1798 static int proc_releaseinterface(struct dev_state *ps, void __user *arg)
1799 {
1800         unsigned int ifnum;
1801         int ret;
1802
1803         if (get_user(ifnum, (unsigned int __user *)arg))
1804                 return -EFAULT;
1805         if ((ret = releaseintf(ps, ifnum)) < 0)
1806                 return ret;
1807         destroy_async_on_interface (ps, ifnum);
1808         return 0;
1809 }
1810
1811 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl)
1812 {
1813         int                     size;
1814         void                    *buf = NULL;
1815         int                     retval = 0;
1816         struct usb_interface    *intf = NULL;
1817         struct usb_driver       *driver = NULL;
1818
1819         /* alloc buffer */
1820         if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) {
1821                 buf = kmalloc(size, GFP_KERNEL);
1822                 if (buf == NULL)
1823                         return -ENOMEM;
1824                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1825                         if (copy_from_user(buf, ctl->data, size)) {
1826                                 kfree(buf);
1827                                 return -EFAULT;
1828                         }
1829                 } else {
1830                         memset(buf, 0, size);
1831                 }
1832         }
1833
1834         if (!connected(ps)) {
1835                 kfree(buf);
1836                 return -ENODEV;
1837         }
1838
1839         if (ps->dev->state != USB_STATE_CONFIGURED)
1840                 retval = -EHOSTUNREACH;
1841         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1842                 retval = -EINVAL;
1843         else switch (ctl->ioctl_code) {
1844
1845         /* disconnect kernel driver from interface */
1846         case USBDEVFS_DISCONNECT:
1847                 if (intf->dev.driver) {
1848                         driver = to_usb_driver(intf->dev.driver);
1849                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1850                         usb_driver_release_interface(driver, intf);
1851                 } else
1852                         retval = -ENODATA;
1853                 break;
1854
1855         /* let kernel drivers try to (re)bind to the interface */
1856         case USBDEVFS_CONNECT:
1857                 if (!intf->dev.driver)
1858                         retval = device_attach(&intf->dev);
1859                 else
1860                         retval = -EBUSY;
1861                 break;
1862
1863         /* talk directly to the interface's driver */
1864         default:
1865                 if (intf->dev.driver)
1866                         driver = to_usb_driver(intf->dev.driver);
1867                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
1868                         retval = -ENOTTY;
1869                 } else {
1870                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
1871                         if (retval == -ENOIOCTLCMD)
1872                                 retval = -ENOTTY;
1873                 }
1874         }
1875
1876         /* cleanup and return */
1877         if (retval >= 0
1878                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
1879                         && size > 0
1880                         && copy_to_user(ctl->data, buf, size) != 0)
1881                 retval = -EFAULT;
1882
1883         kfree(buf);
1884         return retval;
1885 }
1886
1887 static int proc_ioctl_default(struct dev_state *ps, void __user *arg)
1888 {
1889         struct usbdevfs_ioctl   ctrl;
1890
1891         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1892                 return -EFAULT;
1893         return proc_ioctl(ps, &ctrl);
1894 }
1895
1896 #ifdef CONFIG_COMPAT
1897 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg)
1898 {
1899         struct usbdevfs_ioctl32 __user *uioc;
1900         struct usbdevfs_ioctl ctrl;
1901         u32 udata;
1902
1903         uioc = compat_ptr((long)arg);
1904         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
1905             __get_user(ctrl.ifno, &uioc->ifno) ||
1906             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
1907             __get_user(udata, &uioc->data))
1908                 return -EFAULT;
1909         ctrl.data = compat_ptr(udata);
1910
1911         return proc_ioctl(ps, &ctrl);
1912 }
1913 #endif
1914
1915 static int proc_claim_port(struct dev_state *ps, void __user *arg)
1916 {
1917         unsigned portnum;
1918         int rc;
1919
1920         if (get_user(portnum, (unsigned __user *) arg))
1921                 return -EFAULT;
1922         rc = usb_hub_claim_port(ps->dev, portnum, ps);
1923         if (rc == 0)
1924                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
1925                         portnum, task_pid_nr(current), current->comm);
1926         return rc;
1927 }
1928
1929 static int proc_release_port(struct dev_state *ps, void __user *arg)
1930 {
1931         unsigned portnum;
1932
1933         if (get_user(portnum, (unsigned __user *) arg))
1934                 return -EFAULT;
1935         return usb_hub_release_port(ps->dev, portnum, ps);
1936 }
1937
1938 static int proc_get_capabilities(struct dev_state *ps, void __user *arg)
1939 {
1940         __u32 caps;
1941
1942         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM;
1943         if (!ps->dev->bus->no_stop_on_short)
1944                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
1945         if (ps->dev->bus->sg_tablesize)
1946                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
1947
1948         if (put_user(caps, (__u32 __user *)arg))
1949                 return -EFAULT;
1950
1951         return 0;
1952 }
1953
1954 static int proc_disconnect_claim(struct dev_state *ps, void __user *arg)
1955 {
1956         struct usbdevfs_disconnect_claim dc;
1957         struct usb_interface *intf;
1958
1959         if (copy_from_user(&dc, arg, sizeof(dc)))
1960                 return -EFAULT;
1961
1962         intf = usb_ifnum_to_if(ps->dev, dc.interface);
1963         if (!intf)
1964                 return -EINVAL;
1965
1966         if (intf->dev.driver) {
1967                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
1968
1969                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
1970                                 strncmp(dc.driver, intf->dev.driver->name,
1971                                         sizeof(dc.driver)) != 0)
1972                         return -EBUSY;
1973
1974                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
1975                                 strncmp(dc.driver, intf->dev.driver->name,
1976                                         sizeof(dc.driver)) == 0)
1977                         return -EBUSY;
1978
1979                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
1980                 usb_driver_release_interface(driver, intf);
1981         }
1982
1983         return claimintf(ps, dc.interface);
1984 }
1985
1986 /*
1987  * NOTE:  All requests here that have interface numbers as parameters
1988  * are assuming that somehow the configuration has been prevented from
1989  * changing.  But there's no mechanism to ensure that...
1990  */
1991 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
1992                                 void __user *p)
1993 {
1994         struct dev_state *ps = file->private_data;
1995         struct inode *inode = file_inode(file);
1996         struct usb_device *dev = ps->dev;
1997         int ret = -ENOTTY;
1998
1999         if (!(file->f_mode & FMODE_WRITE))
2000                 return -EPERM;
2001
2002         usb_lock_device(dev);
2003         if (!connected(ps)) {
2004                 usb_unlock_device(dev);
2005                 return -ENODEV;
2006         }
2007
2008         switch (cmd) {
2009         case USBDEVFS_CONTROL:
2010                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2011                 ret = proc_control(ps, p);
2012                 if (ret >= 0)
2013                         inode->i_mtime = CURRENT_TIME;
2014                 break;
2015
2016         case USBDEVFS_BULK:
2017                 snoop(&dev->dev, "%s: BULK\n", __func__);
2018                 ret = proc_bulk(ps, p);
2019                 if (ret >= 0)
2020                         inode->i_mtime = CURRENT_TIME;
2021                 break;
2022
2023         case USBDEVFS_RESETEP:
2024                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2025                 ret = proc_resetep(ps, p);
2026                 if (ret >= 0)
2027                         inode->i_mtime = CURRENT_TIME;
2028                 break;
2029
2030         case USBDEVFS_RESET:
2031                 snoop(&dev->dev, "%s: RESET\n", __func__);
2032                 ret = proc_resetdevice(ps);
2033                 break;
2034
2035         case USBDEVFS_CLEAR_HALT:
2036                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2037                 ret = proc_clearhalt(ps, p);
2038                 if (ret >= 0)
2039                         inode->i_mtime = CURRENT_TIME;
2040                 break;
2041
2042         case USBDEVFS_GETDRIVER:
2043                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2044                 ret = proc_getdriver(ps, p);
2045                 break;
2046
2047         case USBDEVFS_CONNECTINFO:
2048                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2049                 ret = proc_connectinfo(ps, p);
2050                 break;
2051
2052         case USBDEVFS_SETINTERFACE:
2053                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2054                 ret = proc_setintf(ps, p);
2055                 break;
2056
2057         case USBDEVFS_SETCONFIGURATION:
2058                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2059                 ret = proc_setconfig(ps, p);
2060                 break;
2061
2062         case USBDEVFS_SUBMITURB:
2063                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2064                 ret = proc_submiturb(ps, p);
2065                 if (ret >= 0)
2066                         inode->i_mtime = CURRENT_TIME;
2067                 break;
2068
2069 #ifdef CONFIG_COMPAT
2070         case USBDEVFS_CONTROL32:
2071                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2072                 ret = proc_control_compat(ps, p);
2073                 if (ret >= 0)
2074                         inode->i_mtime = CURRENT_TIME;
2075                 break;
2076
2077         case USBDEVFS_BULK32:
2078                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2079                 ret = proc_bulk_compat(ps, p);
2080                 if (ret >= 0)
2081                         inode->i_mtime = CURRENT_TIME;
2082                 break;
2083
2084         case USBDEVFS_DISCSIGNAL32:
2085                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2086                 ret = proc_disconnectsignal_compat(ps, p);
2087                 break;
2088
2089         case USBDEVFS_SUBMITURB32:
2090                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2091                 ret = proc_submiturb_compat(ps, p);
2092                 if (ret >= 0)
2093                         inode->i_mtime = CURRENT_TIME;
2094                 break;
2095
2096         case USBDEVFS_REAPURB32:
2097                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2098                 ret = proc_reapurb_compat(ps, p);
2099                 break;
2100
2101         case USBDEVFS_REAPURBNDELAY32:
2102                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2103                 ret = proc_reapurbnonblock_compat(ps, p);
2104                 break;
2105
2106         case USBDEVFS_IOCTL32:
2107                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2108                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2109                 break;
2110 #endif
2111
2112         case USBDEVFS_DISCARDURB:
2113                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2114                 ret = proc_unlinkurb(ps, p);
2115                 break;
2116
2117         case USBDEVFS_REAPURB:
2118                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2119                 ret = proc_reapurb(ps, p);
2120                 break;
2121
2122         case USBDEVFS_REAPURBNDELAY:
2123                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2124                 ret = proc_reapurbnonblock(ps, p);
2125                 break;
2126
2127         case USBDEVFS_DISCSIGNAL:
2128                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2129                 ret = proc_disconnectsignal(ps, p);
2130                 break;
2131
2132         case USBDEVFS_CLAIMINTERFACE:
2133                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2134                 ret = proc_claiminterface(ps, p);
2135                 break;
2136
2137         case USBDEVFS_RELEASEINTERFACE:
2138                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2139                 ret = proc_releaseinterface(ps, p);
2140                 break;
2141
2142         case USBDEVFS_IOCTL:
2143                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2144                 ret = proc_ioctl_default(ps, p);
2145                 break;
2146
2147         case USBDEVFS_CLAIM_PORT:
2148                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2149                 ret = proc_claim_port(ps, p);
2150                 break;
2151
2152         case USBDEVFS_RELEASE_PORT:
2153                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2154                 ret = proc_release_port(ps, p);
2155                 break;
2156         case USBDEVFS_GET_CAPABILITIES:
2157                 ret = proc_get_capabilities(ps, p);
2158                 break;
2159         case USBDEVFS_DISCONNECT_CLAIM:
2160                 ret = proc_disconnect_claim(ps, p);
2161                 break;
2162         }
2163         usb_unlock_device(dev);
2164         if (ret >= 0)
2165                 inode->i_atime = CURRENT_TIME;
2166         return ret;
2167 }
2168
2169 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2170                         unsigned long arg)
2171 {
2172         int ret;
2173
2174         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2175
2176         return ret;
2177 }
2178
2179 #ifdef CONFIG_COMPAT
2180 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2181                         unsigned long arg)
2182 {
2183         int ret;
2184
2185         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2186
2187         return ret;
2188 }
2189 #endif
2190
2191 /* No kernel lock - fine */
2192 static unsigned int usbdev_poll(struct file *file,
2193                                 struct poll_table_struct *wait)
2194 {
2195         struct dev_state *ps = file->private_data;
2196         unsigned int mask = 0;
2197
2198         poll_wait(file, &ps->wait, wait);
2199         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2200                 mask |= POLLOUT | POLLWRNORM;
2201         if (!connected(ps))
2202                 mask |= POLLERR | POLLHUP;
2203         return mask;
2204 }
2205
2206 const struct file_operations usbdev_file_operations = {
2207         .owner =          THIS_MODULE,
2208         .llseek =         usbdev_lseek,
2209         .read =           usbdev_read,
2210         .poll =           usbdev_poll,
2211         .unlocked_ioctl = usbdev_ioctl,
2212 #ifdef CONFIG_COMPAT
2213         .compat_ioctl =   usbdev_compat_ioctl,
2214 #endif
2215         .open =           usbdev_open,
2216         .release =        usbdev_release,
2217 };
2218
2219 static void usbdev_remove(struct usb_device *udev)
2220 {
2221         struct dev_state *ps;
2222         struct siginfo sinfo;
2223
2224         while (!list_empty(&udev->filelist)) {
2225                 ps = list_entry(udev->filelist.next, struct dev_state, list);
2226                 destroy_all_async(ps);
2227                 wake_up_all(&ps->wait);
2228                 list_del_init(&ps->list);
2229                 if (ps->discsignr) {
2230                         sinfo.si_signo = ps->discsignr;
2231                         sinfo.si_errno = EPIPE;
2232                         sinfo.si_code = SI_ASYNCIO;
2233                         sinfo.si_addr = ps->disccontext;
2234                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2235                                         ps->disc_pid, ps->cred, ps->secid);
2236                 }
2237         }
2238 }
2239
2240 static int usbdev_notify(struct notifier_block *self,
2241                                unsigned long action, void *dev)
2242 {
2243         switch (action) {
2244         case USB_DEVICE_ADD:
2245                 break;
2246         case USB_DEVICE_REMOVE:
2247                 usbdev_remove(dev);
2248                 break;
2249         }
2250         return NOTIFY_OK;
2251 }
2252
2253 static struct notifier_block usbdev_nb = {
2254         .notifier_call =        usbdev_notify,
2255 };
2256
2257 static struct cdev usb_device_cdev;
2258
2259 int __init usb_devio_init(void)
2260 {
2261         int retval;
2262
2263         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2264                                         "usb_device");
2265         if (retval) {
2266                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2267                 goto out;
2268         }
2269         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2270         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2271         if (retval) {
2272                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2273                        USB_DEVICE_MAJOR);
2274                 goto error_cdev;
2275         }
2276         usb_register_notify(&usbdev_nb);
2277 out:
2278         return retval;
2279
2280 error_cdev:
2281         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2282         goto out;
2283 }
2284
2285 void usb_devio_cleanup(void)
2286 {
2287         usb_unregister_notify(&usbdev_nb);
2288         cdev_del(&usb_device_cdev);
2289         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2290 }