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