drivers/usb/core/devio.c

   1 /*****************************************************************************/
   2
   3 /*
   4  *      devio.c  --  User space communication with USB devices.
   5  *
   6  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   7  *
   8  *      This program is free software; you can redistribute it and/or modify
   9  *      it under the terms of the GNU General Public License as published by
  10  *      the Free Software Foundation; either version 2 of the License, or
  11  *      (at your option) any later version.
  12  *
  13  *      This program is distributed in the hope that it will be useful,
  14  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *      GNU General Public License for more details.
  17  *
  18  *      You should have received a copy of the GNU General Public License
  19  *      along with this program; if not, write to the Free Software
  20  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  22  *  This file implements the usbfs/x/y files, where
  23  *  x is the bus number and y the device number.
  24  *
  25  *  It allows user space programs/"drivers" to communicate directly
  26  *  with USB devices without intervening kernel driver.
  27  *
  28  *  Revision history
  29  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  30  *    04.01.2000   0.2   Turned into its own filesystem
  31  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  32  *                       (CAN-2005-3055)
  33  */
  34
  35 /*****************************************************************************/
  36
  37 #include <linux/fs.h>
  38 #include <linux/mm.h>
  39 #include <linux/slab.h>
  40 #include <linux/signal.h>
  41 #include <linux/poll.h>
  42 #include <linux/module.h>
  43 #include <linux/string.h>
  44 #include <linux/usb.h>
  45 #include <linux/usbdevice_fs.h>
  46 #include <linux/usb/hcd.h>      /* for usbcore internals */
  47 #include <linux/cdev.h>
  48 #include <linux/notifier.h>
  49 #include <linux/security.h>
  50 #include <linux/user_namespace.h>
  51 #include <linux/scatterlist.h>
  52 #include <linux/uaccess.h>
  53 #include <asm/byteorder.h>
  54 #include <linux/moduleparam.h>
  55
  56 #include "usb.h"
  57
  58 #define USB_MAXBUS                      64
  59 #define USB_DEVICE_MAX                  (USB_MAXBUS * 128)
  60 #define USB_SG_SIZE                     16384 /* split-size for large txs */
  61
  62 /* Mutual exclusion for removal, open, and release */
  63 DEFINE_MUTEX(usbfs_mutex);
  64
  65 struct usb_dev_state {
  66         struct list_head list;      /* state list */
  67         struct usb_device *dev;
  68         struct file *file;
  69         spinlock_t lock;            /* protects the async urb lists */
  70         struct list_head async_pending;
  71         struct list_head async_completed;
  72         wait_queue_head_t wait;     /* wake up if a request completed */
  73         unsigned int discsignr;
  74         struct pid *disc_pid;
  75         const struct cred *cred;
  76         void __user *disccontext;
  77         unsigned long ifclaimed;
  78         u32 secid;
  79         u32 disabled_bulk_eps;
  80 };
  81
  82 struct async {
  83         struct list_head asynclist;
  84         struct usb_dev_state *ps;
  85         struct pid *pid;
  86         const struct cred *cred;
  87         unsigned int signr;
  88         unsigned int ifnum;
  89         void __user *userbuffer;
  90         void __user *userurb;
  91         struct urb *urb;
  92         unsigned int mem_usage;
  93         int status;
  94         u32 secid;
  95         u8 bulk_addr;
  96         u8 bulk_status;
  97 };
  98
  99 static bool usbfs_snoop;
 100 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
 101 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
 102
 103 #define snoop(dev, format, arg...)                              \
 104         do {                                                    \
 105                 if (usbfs_snoop)                                \
 106                         dev_info(dev, format, ## arg);          \
 107         } while (0)
 108
 109 enum snoop_when {
 110         SUBMIT, COMPLETE
 111 };
 112
 113 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 114
 115 /* Limit on the total amount of memory we can allocate for transfers */
 116 static u32 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 atomic64_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(u64 amount)
 128 {
 129         u64 lim;
 130
 131         lim = ACCESS_ONCE(usbfs_memory_mb);
 132         lim <<= 20;
 133
 134         atomic64_add(amount, &usbfs_memory_usage);
 135
 136         if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
 137                 atomic64_sub(amount, &usbfs_memory_usage);
 138                 return -ENOMEM;
 139         }
 140
 141         return 0;
 142 }
 143
 144 /* Memory for a transfer is being deallocated */
 145 static void usbfs_decrease_memory_usage(u64 amount)
 146 {
 147         atomic64_sub(amount, &usbfs_memory_usage);
 148 }
 149
 150 static int connected(struct usb_dev_state *ps)
 151 {
 152         return (!list_empty(&ps->list) &&
 153                         ps->dev->state != USB_STATE_NOTATTACHED);
 154 }
 155
 156 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig)
 157 {
 158         loff_t ret;
 159
 160         mutex_lock(&file_inode(file)->i_mutex);
 161
 162         switch (orig) {
 163         case 0:
 164                 file->f_pos = offset;
 165                 ret = file->f_pos;
 166                 break;
 167         case 1:
 168                 file->f_pos += offset;
 169                 ret = file->f_pos;
 170                 break;
 171         case 2:
 172         default:
 173                 ret = -EINVAL;
 174         }
 175
 176         mutex_unlock(&file_inode(file)->i_mutex);
 177         return ret;
 178 }
 179
 180 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 181                            loff_t *ppos)
 182 {
 183         struct usb_dev_state *ps = file->private_data;
 184         struct usb_device *dev = ps->dev;
 185         ssize_t ret = 0;
 186         unsigned len;
 187         loff_t pos;
 188         int i;
 189
 190         pos = *ppos;
 191         usb_lock_device(dev);
 192         if (!connected(ps)) {
 193                 ret = -ENODEV;
 194                 goto err;
 195         } else if (pos < 0) {
 196                 ret = -EINVAL;
 197                 goto err;
 198         }
 199
 200         if (pos < sizeof(struct usb_device_descriptor)) {
 201                 /* 18 bytes - fits on the stack */
 202                 struct usb_device_descriptor temp_desc;
 203
 204                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 205                 le16_to_cpus(&temp_desc.bcdUSB);
 206                 le16_to_cpus(&temp_desc.idVendor);
 207                 le16_to_cpus(&temp_desc.idProduct);
 208                 le16_to_cpus(&temp_desc.bcdDevice);
 209
 210                 len = sizeof(struct usb_device_descriptor) - pos;
 211                 if (len > nbytes)
 212                         len = nbytes;
 213                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 214                         ret = -EFAULT;
 215                         goto err;
 216                 }
 217
 218                 *ppos += len;
 219                 buf += len;
 220                 nbytes -= len;
 221                 ret += len;
 222         }
 223
 224         pos = sizeof(struct usb_device_descriptor);
 225         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 226                 struct usb_config_descriptor *config =
 227                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 228                 unsigned int length = le16_to_cpu(config->wTotalLength);
 229
 230                 if (*ppos < pos + length) {
 231
 232                         /* The descriptor may claim to be longer than it
 233                          * really is.  Here is the actual allocated length. */
 234                         unsigned alloclen =
 235                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 236
 237                         len = length - (*ppos - pos);
 238                         if (len > nbytes)
 239                                 len = nbytes;
 240
 241                         /* Simply don't write (skip over) unallocated parts */
 242                         if (alloclen > (*ppos - pos)) {
 243                                 alloclen -= (*ppos - pos);
 244                                 if (copy_to_user(buf,
 245                                     dev->rawdescriptors[i] + (*ppos - pos),
 246                                     min(len, alloclen))) {
 247                                         ret = -EFAULT;
 248                                         goto err;
 249                                 }
 250                         }
 251
 252                         *ppos += len;
 253                         buf += len;
 254                         nbytes -= len;
 255                         ret += len;
 256                 }
 257
 258                 pos += length;
 259         }
 260
 261 err:
 262         usb_unlock_device(dev);
 263         return ret;
 264 }
 265
 266 /*
 267  * async list handling
 268  */
 269
 270 static struct async *alloc_async(unsigned int numisoframes)
 271 {
 272         struct async *as;
 273
 274         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 275         if (!as)
 276                 return NULL;
 277         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 278         if (!as->urb) {
 279                 kfree(as);
 280                 return NULL;
 281         }
 282         return as;
 283 }
 284
 285 static void free_async(struct async *as)
 286 {
 287         int i;
 288
 289         put_pid(as->pid);
 290         if (as->cred)
 291                 put_cred(as->cred);
 292         for (i = 0; i < as->urb->num_sgs; i++) {
 293                 if (sg_page(&as->urb->sg[i]))
 294                         kfree(sg_virt(&as->urb->sg[i]));
 295         }
 296         kfree(as->urb->sg);
 297         kfree(as->urb->transfer_buffer);
 298         kfree(as->urb->setup_packet);
 299         usb_free_urb(as->urb);
 300         usbfs_decrease_memory_usage(as->mem_usage);
 301         kfree(as);
 302 }
 303
 304 static void async_newpending(struct async *as)
 305 {
 306         struct usb_dev_state *ps = as->ps;
 307         unsigned long flags;
 308
 309         spin_lock_irqsave(&ps->lock, flags);
 310         list_add_tail(&as->asynclist, &ps->async_pending);
 311         spin_unlock_irqrestore(&ps->lock, flags);
 312 }
 313
 314 static void async_removepending(struct async *as)
 315 {
 316         struct usb_dev_state *ps = as->ps;
 317         unsigned long flags;
 318
 319         spin_lock_irqsave(&ps->lock, flags);
 320         list_del_init(&as->asynclist);
 321         spin_unlock_irqrestore(&ps->lock, flags);
 322 }
 323
 324 static struct async *async_getcompleted(struct usb_dev_state *ps)
 325 {
 326         unsigned long flags;
 327         struct async *as = NULL;
 328
 329         spin_lock_irqsave(&ps->lock, flags);
 330         if (!list_empty(&ps->async_completed)) {
 331                 as = list_entry(ps->async_completed.next, struct async,
 332                                 asynclist);
 333                 list_del_init(&as->asynclist);
 334         }
 335         spin_unlock_irqrestore(&ps->lock, flags);
 336         return as;
 337 }
 338
 339 static struct async *async_getpending(struct usb_dev_state *ps,
 340                                              void __user *userurb)
 341 {
 342         struct async *as;
 343
 344         list_for_each_entry(as, &ps->async_pending, asynclist)
 345                 if (as->userurb == userurb) {
 346                         list_del_init(&as->asynclist);
 347                         return as;
 348                 }
 349
 350         return NULL;
 351 }
 352
 353 static void snoop_urb(struct usb_device *udev,
 354                 void __user *userurb, int pipe, unsigned length,
 355                 int timeout_or_status, enum snoop_when when,
 356                 unsigned char *data, unsigned data_len)
 357 {
 358         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 359         static const char *dirs[] = {"out", "in"};
 360         int ep;
 361         const char *t, *d;
 362
 363         if (!usbfs_snoop)
 364                 return;
 365
 366         ep = usb_pipeendpoint(pipe);
 367         t = types[usb_pipetype(pipe)];
 368         d = dirs[!!usb_pipein(pipe)];
 369
 370         if (userurb) {          /* Async */
 371                 if (when == SUBMIT)
 372                         dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
 373                                         "length %u\n",
 374                                         userurb, ep, t, d, length);
 375                 else
 376                         dev_info(&udev->dev, "userurb %px, ep%d %s-%s, "
 377                                         "actual_length %u status %d\n",
 378                                         userurb, ep, t, d, length,
 379                                         timeout_or_status);
 380         } else {
 381                 if (when == SUBMIT)
 382                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 383                                         "timeout %d\n",
 384                                         ep, t, d, length, timeout_or_status);
 385                 else
 386                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 387                                         "status %d\n",
 388                                         ep, t, d, length, timeout_or_status);
 389         }
 390
 391         if (data && data_len > 0) {
 392                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 393                         data, data_len, 1);
 394         }
 395 }
 396
 397 static void snoop_urb_data(struct urb *urb, unsigned len)
 398 {
 399         int i, size;
 400
 401         if (!usbfs_snoop)
 402                 return;
 403
 404         if (urb->num_sgs == 0) {
 405                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 406                         urb->transfer_buffer, len, 1);
 407                 return;
 408         }
 409
 410         for (i = 0; i < urb->num_sgs && len; i++) {
 411                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 412                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 413                         sg_virt(&urb->sg[i]), size, 1);
 414                 len -= size;
 415         }
 416 }
 417
 418 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
 419 {
 420         unsigned i, len, size;
 421
 422         if (urb->number_of_packets > 0)         /* Isochronous */
 423                 len = urb->transfer_buffer_length;
 424         else                                    /* Non-Isoc */
 425                 len = urb->actual_length;
 426
 427         if (urb->num_sgs == 0) {
 428                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
 429                         return -EFAULT;
 430                 return 0;
 431         }
 432
 433         for (i = 0; i < urb->num_sgs && len; i++) {
 434                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 435                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
 436                         return -EFAULT;
 437                 userbuffer += size;
 438                 len -= size;
 439         }
 440
 441         return 0;
 442 }
 443
 444 #define AS_CONTINUATION 1
 445 #define AS_UNLINK       2
 446
 447 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
 448 __releases(ps->lock)
 449 __acquires(ps->lock)
 450 {
 451         struct urb *urb;
 452         struct async *as;
 453
 454         /* Mark all the pending URBs that match bulk_addr, up to but not
 455          * including the first one without AS_CONTINUATION.  If such an
 456          * URB is encountered then a new transfer has already started so
 457          * the endpoint doesn't need to be disabled; otherwise it does.
 458          */
 459         list_for_each_entry(as, &ps->async_pending, asynclist) {
 460                 if (as->bulk_addr == bulk_addr) {
 461                         if (as->bulk_status != AS_CONTINUATION)
 462                                 goto rescan;
 463                         as->bulk_status = AS_UNLINK;
 464                         as->bulk_addr = 0;
 465                 }
 466         }
 467         ps->disabled_bulk_eps |= (1 << bulk_addr);
 468
 469         /* Now carefully unlink all the marked pending URBs */
 470  rescan:
 471         list_for_each_entry(as, &ps->async_pending, asynclist) {
 472                 if (as->bulk_status == AS_UNLINK) {
 473                         as->bulk_status = 0;            /* Only once */
 474                         urb = as->urb;
 475                         usb_get_urb(urb);
 476                         spin_unlock(&ps->lock);         /* Allow completions */
 477                         usb_unlink_urb(urb);
 478                         usb_put_urb(urb);
 479                         spin_lock(&ps->lock);
 480                         goto rescan;
 481                 }
 482         }
 483 }
 484
 485 static void async_completed(struct urb *urb)
 486 {
 487         struct async *as = urb->context;
 488         struct usb_dev_state *ps = as->ps;
 489         struct siginfo sinfo;
 490         struct pid *pid = NULL;
 491         u32 secid = 0;
 492         const struct cred *cred = NULL;
 493         int signr;
 494
 495         spin_lock(&ps->lock);
 496         list_move_tail(&as->asynclist, &ps->async_completed);
 497         as->status = urb->status;
 498         signr = as->signr;
 499         if (signr) {
 500                 memset(&sinfo, 0, sizeof(sinfo));
 501                 sinfo.si_signo = as->signr;
 502                 sinfo.si_errno = as->status;
 503                 sinfo.si_code = SI_ASYNCIO;
 504                 sinfo.si_addr = as->userurb;
 505                 pid = get_pid(as->pid);
 506                 cred = get_cred(as->cred);
 507                 secid = as->secid;
 508         }
 509         snoop(&urb->dev->dev, "urb complete\n");
 510         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 511                         as->status, COMPLETE, NULL, 0);
 512         if ((urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN)
 513                 snoop_urb_data(urb, urb->actual_length);
 514
 515         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 516                         as->status != -ENOENT)
 517                 cancel_bulk_urbs(ps, as->bulk_addr);
 518
 519         wake_up(&ps->wait);
 520         spin_unlock(&ps->lock);
 521
 522         if (signr) {
 523                 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred, secid);
 524                 put_pid(pid);
 525                 put_cred(cred);
 526         }
 527 }
 528
 529 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
 530 {
 531         struct urb *urb;
 532         struct async *as;
 533         unsigned long flags;
 534
 535         spin_lock_irqsave(&ps->lock, flags);
 536         while (!list_empty(list)) {
 537                 as = list_entry(list->next, struct async, asynclist);
 538                 list_del_init(&as->asynclist);
 539                 urb = as->urb;
 540                 usb_get_urb(urb);
 541
 542                 /* drop the spinlock so the completion handler can run */
 543                 spin_unlock_irqrestore(&ps->lock, flags);
 544                 usb_kill_urb(urb);
 545                 usb_put_urb(urb);
 546                 spin_lock_irqsave(&ps->lock, flags);
 547         }
 548         spin_unlock_irqrestore(&ps->lock, flags);
 549 }
 550
 551 static void destroy_async_on_interface(struct usb_dev_state *ps,
 552                                        unsigned int ifnum)
 553 {
 554         struct list_head *p, *q, hitlist;
 555         unsigned long flags;
 556
 557         INIT_LIST_HEAD(&hitlist);
 558         spin_lock_irqsave(&ps->lock, flags);
 559         list_for_each_safe(p, q, &ps->async_pending)
 560                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 561                         list_move_tail(p, &hitlist);
 562         spin_unlock_irqrestore(&ps->lock, flags);
 563         destroy_async(ps, &hitlist);
 564 }
 565
 566 static void destroy_all_async(struct usb_dev_state *ps)
 567 {
 568         destroy_async(ps, &ps->async_pending);
 569 }
 570
 571 /*
 572  * interface claims are made only at the request of user level code,
 573  * which can also release them (explicitly or by closing files).
 574  * they're also undone when devices disconnect.
 575  */
 576
 577 static int driver_probe(struct usb_interface *intf,
 578                         const struct usb_device_id *id)
 579 {
 580         return -ENODEV;
 581 }
 582
 583 static void driver_disconnect(struct usb_interface *intf)
 584 {
 585         struct usb_dev_state *ps = usb_get_intfdata(intf);
 586         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 587
 588         if (!ps)
 589                 return;
 590
 591         /* NOTE:  this relies on usbcore having canceled and completed
 592          * all pending I/O requests; 2.6 does that.
 593          */
 594
 595         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 596                 clear_bit(ifnum, &ps->ifclaimed);
 597         else
 598                 dev_warn(&intf->dev, "interface number %u out of range\n",
 599                          ifnum);
 600
 601         usb_set_intfdata(intf, NULL);
 602
 603         /* force async requests to complete */
 604         destroy_async_on_interface(ps, ifnum);
 605 }
 606
 607 /* The following routines are merely placeholders.  There is no way
 608  * to inform a user task about suspend or resumes.
 609  */
 610 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 611 {
 612         return 0;
 613 }
 614
 615 static int driver_resume(struct usb_interface *intf)
 616 {
 617         return 0;
 618 }
 619
 620 struct usb_driver usbfs_driver = {
 621         .name =         "usbfs",
 622         .probe =        driver_probe,
 623         .disconnect =   driver_disconnect,
 624         .suspend =      driver_suspend,
 625         .resume =       driver_resume,
 626 };
 627
 628 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
 629 {
 630         struct usb_device *dev = ps->dev;
 631         struct usb_interface *intf;
 632         int err;
 633
 634         if (ifnum >= 8*sizeof(ps->ifclaimed))
 635                 return -EINVAL;
 636         /* already claimed */
 637         if (test_bit(ifnum, &ps->ifclaimed))
 638                 return 0;
 639
 640         intf = usb_ifnum_to_if(dev, ifnum);
 641         if (!intf)
 642                 err = -ENOENT;
 643         else
 644                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 645         if (err == 0)
 646                 set_bit(ifnum, &ps->ifclaimed);
 647         return err;
 648 }
 649
 650 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
 651 {
 652         struct usb_device *dev;
 653         struct usb_interface *intf;
 654         int err;
 655
 656         err = -EINVAL;
 657         if (ifnum >= 8*sizeof(ps->ifclaimed))
 658                 return err;
 659         dev = ps->dev;
 660         intf = usb_ifnum_to_if(dev, ifnum);
 661         if (!intf)
 662                 err = -ENOENT;
 663         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 664                 usb_driver_release_interface(&usbfs_driver, intf);
 665                 err = 0;
 666         }
 667         return err;
 668 }
 669
 670 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
 671 {
 672         if (ps->dev->state != USB_STATE_CONFIGURED)
 673                 return -EHOSTUNREACH;
 674         if (ifnum >= 8*sizeof(ps->ifclaimed))
 675                 return -EINVAL;
 676         if (test_bit(ifnum, &ps->ifclaimed))
 677                 return 0;
 678         /* if not yet claimed, claim it for the driver */
 679         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 680                  "interface %u before use\n", task_pid_nr(current),
 681                  current->comm, ifnum);
 682         return claimintf(ps, ifnum);
 683 }
 684
 685 static int findintfep(struct usb_device *dev, unsigned int ep)
 686 {
 687         unsigned int i, j, e;
 688         struct usb_interface *intf;
 689         struct usb_host_interface *alts;
 690         struct usb_endpoint_descriptor *endpt;
 691
 692         if (ep & ~(USB_DIR_IN|0xf))
 693                 return -EINVAL;
 694         if (!dev->actconfig)
 695                 return -ESRCH;
 696         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 697                 intf = dev->actconfig->interface[i];
 698                 for (j = 0; j < intf->num_altsetting; j++) {
 699                         alts = &intf->altsetting[j];
 700                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 701                                 endpt = &alts->endpoint[e].desc;
 702                                 if (endpt->bEndpointAddress == ep)
 703                                         return alts->desc.bInterfaceNumber;
 704                         }
 705                 }
 706         }
 707         return -ENOENT;
 708 }
 709
 710 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
 711                            unsigned int request, unsigned int index)
 712 {
 713         int ret = 0;
 714         struct usb_host_interface *alt_setting;
 715
 716         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 717          && ps->dev->state != USB_STATE_ADDRESS
 718          && ps->dev->state != USB_STATE_CONFIGURED)
 719                 return -EHOSTUNREACH;
 720         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 721                 return 0;
 722
 723         /*
 724          * check for the special corner case 'get_device_id' in the printer
 725          * class specification, which we always want to allow as it is used
 726          * to query things like ink level, etc.
 727          */
 728         if (requesttype == 0xa1 && request == 0) {
 729                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 730                                                    index >> 8, index & 0xff);
 731                 if (alt_setting
 732                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 733                         return 0;
 734         }
 735
 736         index &= 0xff;
 737         switch (requesttype & USB_RECIP_MASK) {
 738         case USB_RECIP_ENDPOINT:
 739                 if ((index & ~USB_DIR_IN) == 0)
 740                         return 0;
 741                 ret = findintfep(ps->dev, index);
 742                 if (ret < 0) {
 743                         /*
 744                          * Some not fully compliant Win apps seem to get
 745                          * index wrong and have the endpoint number here
 746                          * rather than the endpoint address (with the
 747                          * correct direction). Win does let this through,
 748                          * so we'll not reject it here but leave it to
 749                          * the device to not break KVM. But we warn.
 750                          */
 751                         ret = findintfep(ps->dev, index ^ 0x80);
 752                         if (ret >= 0)
 753                                 dev_info(&ps->dev->dev,
 754                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 755                                         __func__, task_pid_nr(current),
 756                                         current->comm, index, index ^ 0x80);
 757                 }
 758                 if (ret >= 0)
 759                         ret = checkintf(ps, ret);
 760                 break;
 761
 762         case USB_RECIP_INTERFACE:
 763                 ret = checkintf(ps, index);
 764                 break;
 765         }
 766         return ret;
 767 }
 768
 769 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
 770                                                      unsigned char ep)
 771 {
 772         if (ep & USB_ENDPOINT_DIR_MASK)
 773                 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
 774         else
 775                 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
 776 }
 777
 778 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
 779                                   struct usbdevfs_streams __user *streams,
 780                                   unsigned int *num_streams_ret,
 781                                   unsigned int *num_eps_ret,
 782                                   struct usb_host_endpoint ***eps_ret,
 783                                   struct usb_interface **intf_ret)
 784 {
 785         unsigned int i, num_streams, num_eps;
 786         struct usb_host_endpoint **eps;
 787         struct usb_interface *intf = NULL;
 788         unsigned char ep;
 789         int ifnum, ret;
 790
 791         if (get_user(num_streams, &streams->num_streams) ||
 792             get_user(num_eps, &streams->num_eps))
 793                 return -EFAULT;
 794
 795         if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
 796                 return -EINVAL;
 797
 798         /* The XHCI controller allows max 2 ^ 16 streams */
 799         if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
 800                 return -EINVAL;
 801
 802         eps = kmalloc(num_eps * sizeof(*eps), GFP_KERNEL);
 803         if (!eps)
 804                 return -ENOMEM;
 805
 806         for (i = 0; i < num_eps; i++) {
 807                 if (get_user(ep, &streams->eps[i])) {
 808                         ret = -EFAULT;
 809                         goto error;
 810                 }
 811                 eps[i] = ep_to_host_endpoint(ps->dev, ep);
 812                 if (!eps[i]) {
 813                         ret = -EINVAL;
 814                         goto error;
 815                 }
 816
 817                 /* usb_alloc/free_streams operate on an usb_interface */
 818                 ifnum = findintfep(ps->dev, ep);
 819                 if (ifnum < 0) {
 820                         ret = ifnum;
 821                         goto error;
 822                 }
 823
 824                 if (i == 0) {
 825                         ret = checkintf(ps, ifnum);
 826                         if (ret < 0)
 827                                 goto error;
 828                         intf = usb_ifnum_to_if(ps->dev, ifnum);
 829                 } else {
 830                         /* Verify all eps belong to the same interface */
 831                         if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
 832                                 ret = -EINVAL;
 833                                 goto error;
 834                         }
 835                 }
 836         }
 837
 838         if (num_streams_ret)
 839                 *num_streams_ret = num_streams;
 840         *num_eps_ret = num_eps;
 841         *eps_ret = eps;
 842         *intf_ret = intf;
 843
 844         return 0;
 845
 846 error:
 847         kfree(eps);
 848         return ret;
 849 }
 850
 851 static int match_devt(struct device *dev, void *data)
 852 {
 853         return dev->devt == (dev_t) (unsigned long) data;
 854 }
 855
 856 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 857 {
 858         struct device *dev;
 859
 860         dev = bus_find_device(&usb_bus_type, NULL,
 861                               (void *) (unsigned long) devt, match_devt);
 862         if (!dev)
 863                 return NULL;
 864         return container_of(dev, struct usb_device, dev);
 865 }
 866
 867 /*
 868  * file operations
 869  */
 870 static int usbdev_open(struct inode *inode, struct file *file)
 871 {
 872         struct usb_device *dev = NULL;
 873         struct usb_dev_state *ps;
 874         int ret;
 875
 876         ret = -ENOMEM;
 877         ps = kmalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
 878         if (!ps)
 879                 goto out_free_ps;
 880
 881         ret = -ENODEV;
 882
 883         /* Protect against simultaneous removal or release */
 884         mutex_lock(&usbfs_mutex);
 885
 886         /* usbdev device-node */
 887         if (imajor(inode) == USB_DEVICE_MAJOR)
 888                 dev = usbdev_lookup_by_devt(inode->i_rdev);
 889
 890         mutex_unlock(&usbfs_mutex);
 891
 892         if (!dev)
 893                 goto out_free_ps;
 894
 895         usb_lock_device(dev);
 896         if (dev->state == USB_STATE_NOTATTACHED)
 897                 goto out_unlock_device;
 898
 899         ret = usb_autoresume_device(dev);
 900         if (ret)
 901                 goto out_unlock_device;
 902
 903         ps->dev = dev;
 904         ps->file = file;
 905         spin_lock_init(&ps->lock);
 906         INIT_LIST_HEAD(&ps->list);
 907         INIT_LIST_HEAD(&ps->async_pending);
 908         INIT_LIST_HEAD(&ps->async_completed);
 909         init_waitqueue_head(&ps->wait);
 910         ps->discsignr = 0;
 911         ps->disc_pid = get_pid(task_pid(current));
 912         ps->cred = get_current_cred();
 913         ps->disccontext = NULL;
 914         ps->ifclaimed = 0;
 915         security_task_getsecid(current, &ps->secid);
 916         smp_wmb();
 917         list_add_tail(&ps->list, &dev->filelist);
 918         file->private_data = ps;
 919         usb_unlock_device(dev);
 920         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
 921                         current->comm);
 922         return ret;
 923
 924  out_unlock_device:
 925         usb_unlock_device(dev);
 926         usb_put_dev(dev);
 927  out_free_ps:
 928         kfree(ps);
 929         return ret;
 930 }
 931
 932 static int usbdev_release(struct inode *inode, struct file *file)
 933 {
 934         struct usb_dev_state *ps = file->private_data;
 935         struct usb_device *dev = ps->dev;
 936         unsigned int ifnum;
 937         struct async *as;
 938
 939         usb_lock_device(dev);
 940         usb_hub_release_all_ports(dev, ps);
 941
 942         list_del_init(&ps->list);
 943
 944         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
 945                         ifnum++) {
 946                 if (test_bit(ifnum, &ps->ifclaimed))
 947                         releaseintf(ps, ifnum);
 948         }
 949         destroy_all_async(ps);
 950         usb_autosuspend_device(dev);
 951         usb_unlock_device(dev);
 952         usb_put_dev(dev);
 953         put_pid(ps->disc_pid);
 954         put_cred(ps->cred);
 955
 956         as = async_getcompleted(ps);
 957         while (as) {
 958                 free_async(as);
 959                 as = async_getcompleted(ps);
 960         }
 961         kfree(ps);
 962         return 0;
 963 }
 964
 965 static int proc_control(struct usb_dev_state *ps, void __user *arg)
 966 {
 967         struct usb_device *dev = ps->dev;
 968         struct usbdevfs_ctrltransfer ctrl;
 969         unsigned int tmo;
 970         unsigned char *tbuf;
 971         unsigned wLength;
 972         int i, pipe, ret;
 973
 974         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
 975                 return -EFAULT;
 976         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
 977                               ctrl.wIndex);
 978         if (ret)
 979                 return ret;
 980         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
 981         if (wLength > PAGE_SIZE)
 982                 return -EINVAL;
 983         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
 984                         sizeof(struct usb_ctrlrequest));
 985         if (ret)
 986                 return ret;
 987         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
 988         if (!tbuf) {
 989                 ret = -ENOMEM;
 990                 goto done;
 991         }
 992         tmo = ctrl.timeout;
 993         snoop(&dev->dev, "control urb: bRequestType=%02x "
 994                 "bRequest=%02x wValue=%04x "
 995                 "wIndex=%04x wLength=%04x\n",
 996                 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
 997                 ctrl.wIndex, ctrl.wLength);
 998         if (ctrl.bRequestType & 0x80) {
 999                 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data,
1000                                                ctrl.wLength)) {
1001                         ret = -EINVAL;
1002                         goto done;
1003                 }
1004                 pipe = usb_rcvctrlpipe(dev, 0);
1005                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1006
1007                 usb_unlock_device(dev);
1008                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1009                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1010                                     tbuf, ctrl.wLength, tmo);
1011                 usb_lock_device(dev);
1012                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1013                           tbuf, max(i, 0));
1014                 if ((i > 0) && ctrl.wLength) {
1015                         if (copy_to_user(ctrl.data, tbuf, i)) {
1016                                 ret = -EFAULT;
1017                                 goto done;
1018                         }
1019                 }
1020         } else {
1021                 if (ctrl.wLength) {
1022                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1023                                 ret = -EFAULT;
1024                                 goto done;
1025                         }
1026                 }
1027                 pipe = usb_sndctrlpipe(dev, 0);
1028                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1029                         tbuf, ctrl.wLength);
1030
1031                 usb_unlock_device(dev);
1032                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1033                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1034                                     tbuf, ctrl.wLength, tmo);
1035                 usb_lock_device(dev);
1036                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1037         }
1038         if (i < 0 && i != -EPIPE) {
1039                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1040                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
1041                            current->comm, ctrl.bRequestType, ctrl.bRequest,
1042                            ctrl.wLength, i);
1043         }
1044         ret = i;
1045  done:
1046         free_page((unsigned long) tbuf);
1047         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1048                         sizeof(struct usb_ctrlrequest));
1049         return ret;
1050 }
1051
1052 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1053 {
1054         struct usb_device *dev = ps->dev;
1055         struct usbdevfs_bulktransfer bulk;
1056         unsigned int tmo, len1, pipe;
1057         int len2;
1058         unsigned char *tbuf;
1059         int i, ret;
1060
1061         if (copy_from_user(&bulk, arg, sizeof(bulk)))
1062                 return -EFAULT;
1063         ret = findintfep(ps->dev, bulk.ep);
1064         if (ret < 0)
1065                 return ret;
1066         ret = checkintf(ps, ret);
1067         if (ret)
1068                 return ret;
1069         if (bulk.ep & USB_DIR_IN)
1070                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1071         else
1072                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1073         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1074                 return -EINVAL;
1075         len1 = bulk.len;
1076         if (len1 >= (INT_MAX - sizeof(struct urb)))
1077                 return -EINVAL;
1078         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1079         if (ret)
1080                 return ret;
1081         tbuf = kmalloc(len1, GFP_KERNEL);
1082         if (!tbuf) {
1083                 ret = -ENOMEM;
1084                 goto done;
1085         }
1086         tmo = bulk.timeout;
1087         if (bulk.ep & 0x80) {
1088                 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
1089                         ret = -EINVAL;
1090                         goto done;
1091                 }
1092                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1093
1094                 usb_unlock_device(dev);
1095                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1096                 usb_lock_device(dev);
1097                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1098
1099                 if (!i && len2) {
1100                         if (copy_to_user(bulk.data, tbuf, len2)) {
1101                                 ret = -EFAULT;
1102                                 goto done;
1103                         }
1104                 }
1105         } else {
1106                 if (len1) {
1107                         if (copy_from_user(tbuf, bulk.data, len1)) {
1108                                 ret = -EFAULT;
1109                                 goto done;
1110                         }
1111                 }
1112                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1113
1114                 usb_unlock_device(dev);
1115                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1116                 usb_lock_device(dev);
1117                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1118         }
1119         ret = (i < 0 ? i : len2);
1120  done:
1121         kfree(tbuf);
1122         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1123         return ret;
1124 }
1125
1126 static void check_reset_of_active_ep(struct usb_device *udev,
1127                 unsigned int epnum, char *ioctl_name)
1128 {
1129         struct usb_host_endpoint **eps;
1130         struct usb_host_endpoint *ep;
1131
1132         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1133         ep = eps[epnum & 0x0f];
1134         if (ep && !list_empty(&ep->urb_list))
1135                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1136                                 task_pid_nr(current), current->comm,
1137                                 ioctl_name, epnum);
1138 }
1139
1140 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1141 {
1142         unsigned int ep;
1143         int ret;
1144
1145         if (get_user(ep, (unsigned int __user *)arg))
1146                 return -EFAULT;
1147         ret = findintfep(ps->dev, ep);
1148         if (ret < 0)
1149                 return ret;
1150         ret = checkintf(ps, ret);
1151         if (ret)
1152                 return ret;
1153         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1154         usb_reset_endpoint(ps->dev, ep);
1155         return 0;
1156 }
1157
1158 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1159 {
1160         unsigned int ep;
1161         int pipe;
1162         int ret;
1163
1164         if (get_user(ep, (unsigned int __user *)arg))
1165                 return -EFAULT;
1166         ret = findintfep(ps->dev, ep);
1167         if (ret < 0)
1168                 return ret;
1169         ret = checkintf(ps, ret);
1170         if (ret)
1171                 return ret;
1172         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1173         if (ep & USB_DIR_IN)
1174                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1175         else
1176                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1177
1178         return usb_clear_halt(ps->dev, pipe);
1179 }
1180
1181 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1182 {
1183         struct usbdevfs_getdriver gd;
1184         struct usb_interface *intf;
1185         int ret;
1186
1187         if (copy_from_user(&gd, arg, sizeof(gd)))
1188                 return -EFAULT;
1189         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1190         if (!intf || !intf->dev.driver)
1191                 ret = -ENODATA;
1192         else {
1193                 strlcpy(gd.driver, intf->dev.driver->name,
1194                                 sizeof(gd.driver));
1195                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1196         }
1197         return ret;
1198 }
1199
1200 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1201 {
1202         struct usbdevfs_connectinfo ci;
1203
1204         memset(&ci, 0, sizeof(ci));
1205         ci.devnum = ps->dev->devnum;
1206         ci.slow = ps->dev->speed == USB_SPEED_LOW;
1207
1208         if (copy_to_user(arg, &ci, sizeof(ci)))
1209                 return -EFAULT;
1210         return 0;
1211 }
1212
1213 static int proc_resetdevice(struct usb_dev_state *ps)
1214 {
1215         return usb_reset_device(ps->dev);
1216 }
1217
1218 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1219 {
1220         struct usbdevfs_setinterface setintf;
1221         int ret;
1222
1223         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1224                 return -EFAULT;
1225         ret = checkintf(ps, setintf.interface);
1226         if (ret)
1227                 return ret;
1228
1229         destroy_async_on_interface(ps, setintf.interface);
1230
1231         return usb_set_interface(ps->dev, setintf.interface,
1232                         setintf.altsetting);
1233 }
1234
1235 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1236 {
1237         int u;
1238         int status = 0;
1239         struct usb_host_config *actconfig;
1240
1241         if (get_user(u, (int __user *)arg))
1242                 return -EFAULT;
1243
1244         actconfig = ps->dev->actconfig;
1245
1246         /* Don't touch the device if any interfaces are claimed.
1247          * It could interfere with other drivers' operations, and if
1248          * an interface is claimed by usbfs it could easily deadlock.
1249          */
1250         if (actconfig) {
1251                 int i;
1252
1253                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1254                         if (usb_interface_claimed(actconfig->interface[i])) {
1255                                 dev_warn(&ps->dev->dev,
1256                                         "usbfs: interface %d claimed by %s "
1257                                         "while '%s' sets config #%d\n",
1258                                         actconfig->interface[i]
1259                                                 ->cur_altsetting
1260                                                 ->desc.bInterfaceNumber,
1261                                         actconfig->interface[i]
1262                                                 ->dev.driver->name,
1263                                         current->comm, u);
1264                                 status = -EBUSY;
1265                                 break;
1266                         }
1267                 }
1268         }
1269
1270         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1271          * so avoid usb_set_configuration()'s kick to sysfs
1272          */
1273         if (status == 0) {
1274                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1275                         status = usb_reset_configuration(ps->dev);
1276                 else
1277                         status = usb_set_configuration(ps->dev, u);
1278         }
1279
1280         return status;
1281 }
1282
1283 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1284                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1285                         void __user *arg)
1286 {
1287         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1288         struct usb_host_endpoint *ep;
1289         struct async *as = NULL;
1290         struct usb_ctrlrequest *dr = NULL;
1291         unsigned int u, totlen, isofrmlen;
1292         int i, ret, num_sgs = 0, ifnum = -1;
1293         int number_of_packets = 0;
1294         unsigned int stream_id = 0;
1295         void *buf;
1296         bool is_in;
1297         bool allow_short = false;
1298         bool allow_zero = false;
1299         unsigned long mask =    USBDEVFS_URB_SHORT_NOT_OK |
1300                                 USBDEVFS_URB_BULK_CONTINUATION |
1301                                 USBDEVFS_URB_NO_FSBR |
1302                                 USBDEVFS_URB_ZERO_PACKET |
1303                                 USBDEVFS_URB_NO_INTERRUPT;
1304         /* USBDEVFS_URB_ISO_ASAP is a special case */
1305         if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1306                 mask |= USBDEVFS_URB_ISO_ASAP;
1307
1308         if (uurb->flags & ~mask)
1309                         return -EINVAL;
1310
1311         if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1312                 return -EINVAL;
1313         if (uurb->buffer_length > 0 && !uurb->buffer)
1314                 return -EINVAL;
1315         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1316             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1317                 ifnum = findintfep(ps->dev, uurb->endpoint);
1318                 if (ifnum < 0)
1319                         return ifnum;
1320                 ret = checkintf(ps, ifnum);
1321                 if (ret)
1322                         return ret;
1323         }
1324         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1325         if (!ep)
1326                 return -ENOENT;
1327         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1328
1329         u = 0;
1330         switch (uurb->type) {
1331         case USBDEVFS_URB_TYPE_CONTROL:
1332                 if (!usb_endpoint_xfer_control(&ep->desc))
1333                         return -EINVAL;
1334                 /* min 8 byte setup packet */
1335                 if (uurb->buffer_length < 8)
1336                         return -EINVAL;
1337                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1338                 if (!dr)
1339                         return -ENOMEM;
1340                 if (copy_from_user(dr, uurb->buffer, 8)) {
1341                         ret = -EFAULT;
1342                         goto error;
1343                 }
1344                 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1345                         ret = -EINVAL;
1346                         goto error;
1347                 }
1348                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1349                                       le16_to_cpup(&dr->wIndex));
1350                 if (ret)
1351                         goto error;
1352                 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1353                 uurb->buffer += 8;
1354                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1355                         is_in = 1;
1356                         uurb->endpoint |= USB_DIR_IN;
1357                 } else {
1358                         is_in = 0;
1359                         uurb->endpoint &= ~USB_DIR_IN;
1360                 }
1361                 if (is_in)
1362                         allow_short = true;
1363                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1364                         "bRequest=%02x wValue=%04x "
1365                         "wIndex=%04x wLength=%04x\n",
1366                         dr->bRequestType, dr->bRequest,
1367                         __le16_to_cpup(&dr->wValue),
1368                         __le16_to_cpup(&dr->wIndex),
1369                         __le16_to_cpup(&dr->wLength));
1370                 u = sizeof(struct usb_ctrlrequest);
1371                 break;
1372
1373         case USBDEVFS_URB_TYPE_BULK:
1374                 if (!is_in)
1375                         allow_zero = true;
1376                 else
1377                         allow_short = true;
1378                 switch (usb_endpoint_type(&ep->desc)) {
1379                 case USB_ENDPOINT_XFER_CONTROL:
1380                 case USB_ENDPOINT_XFER_ISOC:
1381                         return -EINVAL;
1382                 case USB_ENDPOINT_XFER_INT:
1383                         /* allow single-shot interrupt transfers */
1384                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1385                         goto interrupt_urb;
1386                 }
1387                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1388                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1389                         num_sgs = 0;
1390                 if (ep->streams)
1391                         stream_id = uurb->stream_id;
1392                 break;
1393
1394         case USBDEVFS_URB_TYPE_INTERRUPT:
1395                 if (!usb_endpoint_xfer_int(&ep->desc))
1396                         return -EINVAL;
1397  interrupt_urb:
1398                 if (!is_in)
1399                         allow_zero = true;
1400                 else
1401                         allow_short = true;
1402                 break;
1403
1404         case USBDEVFS_URB_TYPE_ISO:
1405                 /* arbitrary limit */
1406                 if (uurb->number_of_packets < 1 ||
1407                     uurb->number_of_packets > 128)
1408                         return -EINVAL;
1409                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1410                         return -EINVAL;
1411                 number_of_packets = uurb->number_of_packets;
1412                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1413                                    number_of_packets;
1414                 isopkt = kmalloc(isofrmlen, GFP_KERNEL);
1415                 if (!isopkt)
1416                         return -ENOMEM;
1417                 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) {
1418                         ret = -EFAULT;
1419                         goto error;
1420                 }
1421                 for (totlen = u = 0; u < number_of_packets; u++) {
1422                         /*
1423                          * arbitrary limit need for USB 3.0
1424                          * bMaxBurst (0~15 allowed, 1~16 packets)
1425                          * bmAttributes (bit 1:0, mult 0~2, 1~3 packets)
1426                          * sizemax: 1024 * 16 * 3 = 49152
1427                          */
1428                         if (isopkt[u].length > 49152) {
1429                                 ret = -EINVAL;
1430                                 goto error;
1431                         }
1432                         totlen += isopkt[u].length;
1433                 }
1434                 u *= sizeof(struct usb_iso_packet_descriptor);
1435                 uurb->buffer_length = totlen;
1436                 break;
1437
1438         default:
1439                 return -EINVAL;
1440         }
1441
1442         if (uurb->buffer_length > 0 &&
1443                         !access_ok(is_in ? VERIFY_WRITE : VERIFY_READ,
1444                                 uurb->buffer, uurb->buffer_length)) {
1445                 ret = -EFAULT;
1446                 goto error;
1447         }
1448         as = alloc_async(number_of_packets);
1449         if (!as) {
1450                 ret = -ENOMEM;
1451                 goto error;
1452         }
1453
1454         u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1455              num_sgs * sizeof(struct scatterlist);
1456         ret = usbfs_increase_memory_usage(u);
1457         if (ret)
1458                 goto error;
1459         as->mem_usage = u;
1460
1461         if (num_sgs) {
1462                 as->urb->sg = kmalloc(num_sgs * sizeof(struct scatterlist),
1463                                       GFP_KERNEL);
1464                 if (!as->urb->sg) {
1465                         ret = -ENOMEM;
1466                         goto error;
1467                 }
1468                 as->urb->num_sgs = num_sgs;
1469                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1470
1471                 totlen = uurb->buffer_length;
1472                 for (i = 0; i < as->urb->num_sgs; i++) {
1473                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1474                         buf = kmalloc(u, GFP_KERNEL);
1475                         if (!buf) {
1476                                 ret = -ENOMEM;
1477                                 goto error;
1478                         }
1479                         sg_set_buf(&as->urb->sg[i], buf, u);
1480
1481                         if (!is_in) {
1482                                 if (copy_from_user(buf, uurb->buffer, u)) {
1483                                         ret = -EFAULT;
1484                                         goto error;
1485                                 }
1486                                 uurb->buffer += u;
1487                         }
1488                         totlen -= u;
1489                 }
1490         } else if (uurb->buffer_length > 0) {
1491                 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1492                                 GFP_KERNEL);
1493                 if (!as->urb->transfer_buffer) {
1494                         ret = -ENOMEM;
1495                         goto error;
1496                 }
1497
1498                 if (!is_in) {
1499                         if (copy_from_user(as->urb->transfer_buffer,
1500                                            uurb->buffer,
1501                                            uurb->buffer_length)) {
1502                                 ret = -EFAULT;
1503                                 goto error;
1504                         }
1505                 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1506                         /*
1507                          * Isochronous input data may end up being
1508                          * discontiguous if some of the packets are short.
1509                          * Clear the buffer so that the gaps don't leak
1510                          * kernel data to userspace.
1511                          */
1512                         memset(as->urb->transfer_buffer, 0,
1513                                         uurb->buffer_length);
1514                 }
1515         }
1516         as->urb->dev = ps->dev;
1517         as->urb->pipe = (uurb->type << 30) |
1518                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1519                         (uurb->endpoint & USB_DIR_IN);
1520
1521         /* This tedious sequence is necessary because the URB_* flags
1522          * are internal to the kernel and subject to change, whereas
1523          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1524          */
1525         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1526         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1527                 u |= URB_ISO_ASAP;
1528         if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1529                 u |= URB_SHORT_NOT_OK;
1530         if (uurb->flags & USBDEVFS_URB_NO_FSBR)
1531                 u |= URB_NO_FSBR;
1532         if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1533                 u |= URB_ZERO_PACKET;
1534         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1535                 u |= URB_NO_INTERRUPT;
1536         as->urb->transfer_flags = u;
1537
1538         if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1539                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1540         if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1541                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1542
1543         as->urb->transfer_buffer_length = uurb->buffer_length;
1544         as->urb->setup_packet = (unsigned char *)dr;
1545         dr = NULL;
1546         as->urb->start_frame = uurb->start_frame;
1547         as->urb->number_of_packets = number_of_packets;
1548         as->urb->stream_id = stream_id;
1549
1550         if (ep->desc.bInterval) {
1551                 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1552                                 ps->dev->speed == USB_SPEED_HIGH ||
1553                                 ps->dev->speed >= USB_SPEED_SUPER)
1554                         as->urb->interval = 1 <<
1555                                         min(15, ep->desc.bInterval - 1);
1556                 else
1557                         as->urb->interval = ep->desc.bInterval;
1558         }
1559
1560         as->urb->context = as;
1561         as->urb->complete = async_completed;
1562         for (totlen = u = 0; u < number_of_packets; u++) {
1563                 as->urb->iso_frame_desc[u].offset = totlen;
1564                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1565                 totlen += isopkt[u].length;
1566         }
1567         kfree(isopkt);
1568         isopkt = NULL;
1569         as->ps = ps;
1570         as->userurb = arg;
1571         if (is_in && uurb->buffer_length > 0)
1572                 as->userbuffer = uurb->buffer;
1573         else
1574                 as->userbuffer = NULL;
1575         as->signr = uurb->signr;
1576         as->ifnum = ifnum;
1577         as->pid = get_pid(task_pid(current));
1578         as->cred = get_current_cred();
1579         security_task_getsecid(current, &as->secid);
1580         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1581                         as->urb->transfer_buffer_length, 0, SUBMIT,
1582                         NULL, 0);
1583         if (!is_in)
1584                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1585
1586         async_newpending(as);
1587
1588         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1589                 spin_lock_irq(&ps->lock);
1590
1591                 /* Not exactly the endpoint address; the direction bit is
1592                  * shifted to the 0x10 position so that the value will be
1593                  * between 0 and 31.
1594                  */
1595                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1596                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1597                                 >> 3);
1598
1599                 /* If this bulk URB is the start of a new transfer, re-enable
1600                  * the endpoint.  Otherwise mark it as a continuation URB.
1601                  */
1602                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1603                         as->bulk_status = AS_CONTINUATION;
1604                 else
1605                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1606
1607                 /* Don't accept continuation URBs if the endpoint is
1608                  * disabled because of an earlier error.
1609                  */
1610                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1611                         ret = -EREMOTEIO;
1612                 else
1613                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1614                 spin_unlock_irq(&ps->lock);
1615         } else {
1616                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1617         }
1618
1619         if (ret) {
1620                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1621                            "usbfs: usb_submit_urb returned %d\n", ret);
1622                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1623                                 0, ret, COMPLETE, NULL, 0);
1624                 async_removepending(as);
1625                 goto error;
1626         }
1627         return 0;
1628
1629  error:
1630         kfree(isopkt);
1631         kfree(dr);
1632         if (as)
1633                 free_async(as);
1634         return ret;
1635 }
1636
1637 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1638 {
1639         struct usbdevfs_urb uurb;
1640
1641         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1642                 return -EFAULT;
1643
1644         return proc_do_submiturb(ps, &uurb,
1645                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1646                         arg);
1647 }
1648
1649 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1650 {
1651         struct urb *urb;
1652         struct async *as;
1653         unsigned long flags;
1654
1655         spin_lock_irqsave(&ps->lock, flags);
1656         as = async_getpending(ps, arg);
1657         if (!as) {
1658                 spin_unlock_irqrestore(&ps->lock, flags);
1659                 return -EINVAL;
1660         }
1661
1662         urb = as->urb;
1663         usb_get_urb(urb);
1664         spin_unlock_irqrestore(&ps->lock, flags);
1665
1666         usb_kill_urb(urb);
1667         usb_put_urb(urb);
1668
1669         return 0;
1670 }
1671
1672 static void compute_isochronous_actual_length(struct urb *urb)
1673 {
1674         unsigned int i;
1675
1676         if (urb->number_of_packets > 0) {
1677                 urb->actual_length = 0;
1678                 for (i = 0; i < urb->number_of_packets; i++)
1679                         urb->actual_length +=
1680                                         urb->iso_frame_desc[i].actual_length;
1681         }
1682 }
1683
1684 static int processcompl(struct async *as, void __user * __user *arg)
1685 {
1686         struct urb *urb = as->urb;
1687         struct usbdevfs_urb __user *userurb = as->userurb;
1688         void __user *addr = as->userurb;
1689         unsigned int i;
1690
1691         compute_isochronous_actual_length(urb);
1692         if (as->userbuffer && urb->actual_length) {
1693                 if (copy_urb_data_to_user(as->userbuffer, urb))
1694                         goto err_out;
1695         }
1696         if (put_user(as->status, &userurb->status))
1697                 goto err_out;
1698         if (put_user(urb->actual_length, &userurb->actual_length))
1699                 goto err_out;
1700         if (put_user(urb->error_count, &userurb->error_count))
1701                 goto err_out;
1702
1703         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1704                 for (i = 0; i < urb->number_of_packets; i++) {
1705                         if (put_user(urb->iso_frame_desc[i].actual_length,
1706                                      &userurb->iso_frame_desc[i].actual_length))
1707                                 goto err_out;
1708                         if (put_user(urb->iso_frame_desc[i].status,
1709                                      &userurb->iso_frame_desc[i].status))
1710                                 goto err_out;
1711                 }
1712         }
1713
1714         if (put_user(addr, (void __user * __user *)arg))
1715                 return -EFAULT;
1716         return 0;
1717
1718 err_out:
1719         return -EFAULT;
1720 }
1721
1722 static struct async *reap_as(struct usb_dev_state *ps)
1723 {
1724         DECLARE_WAITQUEUE(wait, current);
1725         struct async *as = NULL;
1726         struct usb_device *dev = ps->dev;
1727
1728         add_wait_queue(&ps->wait, &wait);
1729         for (;;) {
1730                 __set_current_state(TASK_INTERRUPTIBLE);
1731                 as = async_getcompleted(ps);
1732                 if (as || !connected(ps))
1733                         break;
1734                 if (signal_pending(current))
1735                         break;
1736                 usb_unlock_device(dev);
1737                 schedule();
1738                 usb_lock_device(dev);
1739         }
1740         remove_wait_queue(&ps->wait, &wait);
1741         set_current_state(TASK_RUNNING);
1742         return as;
1743 }
1744
1745 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1746 {
1747         struct async *as = reap_as(ps);
1748         if (as) {
1749                 int retval = processcompl(as, (void __user * __user *)arg);
1750                 free_async(as);
1751                 return retval;
1752         }
1753         if (signal_pending(current))
1754                 return -EINTR;
1755         return -ENODEV;
1756 }
1757
1758 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1759 {
1760         int retval;
1761         struct async *as;
1762
1763         as = async_getcompleted(ps);
1764         if (as) {
1765                 retval = processcompl(as, (void __user * __user *)arg);
1766                 free_async(as);
1767         } else {
1768                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1769         }
1770         return retval;
1771 }
1772
1773 #ifdef CONFIG_COMPAT
1774 static int proc_control_compat(struct usb_dev_state *ps,
1775                                 struct usbdevfs_ctrltransfer32 __user *p32)
1776 {
1777         struct usbdevfs_ctrltransfer __user *p;
1778         __u32 udata;
1779         p = compat_alloc_user_space(sizeof(*p));
1780         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1781             get_user(udata, &p32->data) ||
1782             put_user(compat_ptr(udata), &p->data))
1783                 return -EFAULT;
1784         return proc_control(ps, p);
1785 }
1786
1787 static int proc_bulk_compat(struct usb_dev_state *ps,
1788                         struct usbdevfs_bulktransfer32 __user *p32)
1789 {
1790         struct usbdevfs_bulktransfer __user *p;
1791         compat_uint_t n;
1792         compat_caddr_t addr;
1793
1794         p = compat_alloc_user_space(sizeof(*p));
1795
1796         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1797             get_user(n, &p32->len) || put_user(n, &p->len) ||
1798             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1799             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1800                 return -EFAULT;
1801
1802         return proc_bulk(ps, p);
1803 }
1804 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1805 {
1806         struct usbdevfs_disconnectsignal32 ds;
1807
1808         if (copy_from_user(&ds, arg, sizeof(ds)))
1809                 return -EFAULT;
1810         ps->discsignr = ds.signr;
1811         ps->disccontext = compat_ptr(ds.context);
1812         return 0;
1813 }
1814
1815 static int get_urb32(struct usbdevfs_urb *kurb,
1816                      struct usbdevfs_urb32 __user *uurb)
1817 {
1818         __u32  uptr;
1819         if (!access_ok(VERIFY_READ, uurb, sizeof(*uurb)) ||
1820             __get_user(kurb->type, &uurb->type) ||
1821             __get_user(kurb->endpoint, &uurb->endpoint) ||
1822             __get_user(kurb->status, &uurb->status) ||
1823             __get_user(kurb->flags, &uurb->flags) ||
1824             __get_user(kurb->buffer_length, &uurb->buffer_length) ||
1825             __get_user(kurb->actual_length, &uurb->actual_length) ||
1826             __get_user(kurb->start_frame, &uurb->start_frame) ||
1827             __get_user(kurb->number_of_packets, &uurb->number_of_packets) ||
1828             __get_user(kurb->error_count, &uurb->error_count) ||
1829             __get_user(kurb->signr, &uurb->signr))
1830                 return -EFAULT;
1831
1832         if (__get_user(uptr, &uurb->buffer))
1833                 return -EFAULT;
1834         kurb->buffer = compat_ptr(uptr);
1835         if (__get_user(uptr, &uurb->usercontext))
1836                 return -EFAULT;
1837         kurb->usercontext = compat_ptr(uptr);
1838
1839         return 0;
1840 }
1841
1842 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
1843 {
1844         struct usbdevfs_urb uurb;
1845
1846         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
1847                 return -EFAULT;
1848
1849         return proc_do_submiturb(ps, &uurb,
1850                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
1851                         arg);
1852 }
1853
1854 static int processcompl_compat(struct async *as, void __user * __user *arg)
1855 {
1856         struct urb *urb = as->urb;
1857         struct usbdevfs_urb32 __user *userurb = as->userurb;
1858         void __user *addr = as->userurb;
1859         unsigned int i;
1860
1861         compute_isochronous_actual_length(urb);
1862         if (as->userbuffer && urb->actual_length) {
1863                 if (copy_urb_data_to_user(as->userbuffer, urb))
1864                         return -EFAULT;
1865         }
1866         if (put_user(as->status, &userurb->status))
1867                 return -EFAULT;
1868         if (put_user(urb->actual_length, &userurb->actual_length))
1869                 return -EFAULT;
1870         if (put_user(urb->error_count, &userurb->error_count))
1871                 return -EFAULT;
1872
1873         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1874                 for (i = 0; i < urb->number_of_packets; i++) {
1875                         if (put_user(urb->iso_frame_desc[i].actual_length,
1876                                      &userurb->iso_frame_desc[i].actual_length))
1877                                 return -EFAULT;
1878                         if (put_user(urb->iso_frame_desc[i].status,
1879                                      &userurb->iso_frame_desc[i].status))
1880                                 return -EFAULT;
1881                 }
1882         }
1883
1884         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
1885                 return -EFAULT;
1886         return 0;
1887 }
1888
1889 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
1890 {
1891         struct async *as = reap_as(ps);
1892         if (as) {
1893                 int retval = processcompl_compat(as, (void __user * __user *)arg);
1894                 free_async(as);
1895                 return retval;
1896         }
1897         if (signal_pending(current))
1898                 return -EINTR;
1899         return -ENODEV;
1900 }
1901
1902 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
1903 {
1904         int retval;
1905         struct async *as;
1906
1907         as = async_getcompleted(ps);
1908         if (as) {
1909                 retval = processcompl_compat(as, (void __user * __user *)arg);
1910                 free_async(as);
1911         } else {
1912                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1913         }
1914         return retval;
1915 }
1916
1917
1918 #endif
1919
1920 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
1921 {
1922         struct usbdevfs_disconnectsignal ds;
1923
1924         if (copy_from_user(&ds, arg, sizeof(ds)))
1925                 return -EFAULT;
1926         ps->discsignr = ds.signr;
1927         ps->disccontext = ds.context;
1928         return 0;
1929 }
1930
1931 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
1932 {
1933         unsigned int ifnum;
1934
1935         if (get_user(ifnum, (unsigned int __user *)arg))
1936                 return -EFAULT;
1937         return claimintf(ps, ifnum);
1938 }
1939
1940 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
1941 {
1942         unsigned int ifnum;
1943         int ret;
1944
1945         if (get_user(ifnum, (unsigned int __user *)arg))
1946                 return -EFAULT;
1947         ret = releaseintf(ps, ifnum);
1948         if (ret < 0)
1949                 return ret;
1950         destroy_async_on_interface (ps, ifnum);
1951         return 0;
1952 }
1953
1954 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
1955 {
1956         int                     size;
1957         void                    *buf = NULL;
1958         int                     retval = 0;
1959         struct usb_interface    *intf = NULL;
1960         struct usb_driver       *driver = NULL;
1961
1962         /* alloc buffer */
1963         size = _IOC_SIZE(ctl->ioctl_code);
1964         if (size > 0) {
1965                 buf = kmalloc(size, GFP_KERNEL);
1966                 if (buf == NULL)
1967                         return -ENOMEM;
1968                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
1969                         if (copy_from_user(buf, ctl->data, size)) {
1970                                 kfree(buf);
1971                                 return -EFAULT;
1972                         }
1973                 } else {
1974                         memset(buf, 0, size);
1975                 }
1976         }
1977
1978         if (!connected(ps)) {
1979                 kfree(buf);
1980                 return -ENODEV;
1981         }
1982
1983         if (ps->dev->state != USB_STATE_CONFIGURED)
1984                 retval = -EHOSTUNREACH;
1985         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
1986                 retval = -EINVAL;
1987         else switch (ctl->ioctl_code) {
1988
1989         /* disconnect kernel driver from interface */
1990         case USBDEVFS_DISCONNECT:
1991                 if (intf->dev.driver) {
1992                         driver = to_usb_driver(intf->dev.driver);
1993                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
1994                         usb_driver_release_interface(driver, intf);
1995                 } else
1996                         retval = -ENODATA;
1997                 break;
1998
1999         /* let kernel drivers try to (re)bind to the interface */
2000         case USBDEVFS_CONNECT:
2001                 if (!intf->dev.driver)
2002                         retval = device_attach(&intf->dev);
2003                 else
2004                         retval = -EBUSY;
2005                 break;
2006
2007         /* talk directly to the interface's driver */
2008         default:
2009                 if (intf->dev.driver)
2010                         driver = to_usb_driver(intf->dev.driver);
2011                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2012                         retval = -ENOTTY;
2013                 } else {
2014                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2015                         if (retval == -ENOIOCTLCMD)
2016                                 retval = -ENOTTY;
2017                 }
2018         }
2019
2020         /* cleanup and return */
2021         if (retval >= 0
2022                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2023                         && size > 0
2024                         && copy_to_user(ctl->data, buf, size) != 0)
2025                 retval = -EFAULT;
2026
2027         kfree(buf);
2028         return retval;
2029 }
2030
2031 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2032 {
2033         struct usbdevfs_ioctl   ctrl;
2034
2035         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2036                 return -EFAULT;
2037         return proc_ioctl(ps, &ctrl);
2038 }
2039
2040 #ifdef CONFIG_COMPAT
2041 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2042 {
2043         struct usbdevfs_ioctl32 __user *uioc;
2044         struct usbdevfs_ioctl ctrl;
2045         u32 udata;
2046
2047         uioc = compat_ptr((long)arg);
2048         if (!access_ok(VERIFY_READ, uioc, sizeof(*uioc)) ||
2049             __get_user(ctrl.ifno, &uioc->ifno) ||
2050             __get_user(ctrl.ioctl_code, &uioc->ioctl_code) ||
2051             __get_user(udata, &uioc->data))
2052                 return -EFAULT;
2053         ctrl.data = compat_ptr(udata);
2054
2055         return proc_ioctl(ps, &ctrl);
2056 }
2057 #endif
2058
2059 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2060 {
2061         unsigned portnum;
2062         int rc;
2063
2064         if (get_user(portnum, (unsigned __user *) arg))
2065                 return -EFAULT;
2066         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2067         if (rc == 0)
2068                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2069                         portnum, task_pid_nr(current), current->comm);
2070         return rc;
2071 }
2072
2073 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2074 {
2075         unsigned portnum;
2076
2077         if (get_user(portnum, (unsigned __user *) arg))
2078                 return -EFAULT;
2079         return usb_hub_release_port(ps->dev, portnum, ps);
2080 }
2081
2082 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2083 {
2084         __u32 caps;
2085
2086         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2087                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT;
2088         if (!ps->dev->bus->no_stop_on_short)
2089                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2090         if (ps->dev->bus->sg_tablesize)
2091                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2092
2093         if (put_user(caps, (__u32 __user *)arg))
2094                 return -EFAULT;
2095
2096         return 0;
2097 }
2098
2099 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2100 {
2101         struct usbdevfs_disconnect_claim dc;
2102         struct usb_interface *intf;
2103
2104         if (copy_from_user(&dc, arg, sizeof(dc)))
2105                 return -EFAULT;
2106
2107         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2108         if (!intf)
2109                 return -EINVAL;
2110
2111         if (intf->dev.driver) {
2112                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2113
2114                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2115                                 strncmp(dc.driver, intf->dev.driver->name,
2116                                         sizeof(dc.driver)) != 0)
2117                         return -EBUSY;
2118
2119                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2120                                 strncmp(dc.driver, intf->dev.driver->name,
2121                                         sizeof(dc.driver)) == 0)
2122                         return -EBUSY;
2123
2124                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2125                 usb_driver_release_interface(driver, intf);
2126         }
2127
2128         return claimintf(ps, dc.interface);
2129 }
2130
2131 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2132 {
2133         unsigned num_streams, num_eps;
2134         struct usb_host_endpoint **eps;
2135         struct usb_interface *intf;
2136         int r;
2137
2138         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2139                                    &eps, &intf);
2140         if (r)
2141                 return r;
2142
2143         destroy_async_on_interface(ps,
2144                                    intf->altsetting[0].desc.bInterfaceNumber);
2145
2146         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2147         kfree(eps);
2148         return r;
2149 }
2150
2151 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2152 {
2153         unsigned num_eps;
2154         struct usb_host_endpoint **eps;
2155         struct usb_interface *intf;
2156         int r;
2157
2158         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2159         if (r)
2160                 return r;
2161
2162         destroy_async_on_interface(ps,
2163                                    intf->altsetting[0].desc.bInterfaceNumber);
2164
2165         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2166         kfree(eps);
2167         return r;
2168 }
2169
2170 /*
2171  * NOTE:  All requests here that have interface numbers as parameters
2172  * are assuming that somehow the configuration has been prevented from
2173  * changing.  But there's no mechanism to ensure that...
2174  */
2175 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2176                                 void __user *p)
2177 {
2178         struct usb_dev_state *ps = file->private_data;
2179         struct inode *inode = file_inode(file);
2180         struct usb_device *dev = ps->dev;
2181         int ret = -ENOTTY;
2182
2183         if (!(file->f_mode & FMODE_WRITE))
2184                 return -EPERM;
2185
2186         usb_lock_device(dev);
2187
2188         /* Reap operations are allowed even after disconnection */
2189         switch (cmd) {
2190         case USBDEVFS_REAPURB:
2191                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2192                 ret = proc_reapurb(ps, p);
2193                 goto done;
2194
2195         case USBDEVFS_REAPURBNDELAY:
2196                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2197                 ret = proc_reapurbnonblock(ps, p);
2198                 goto done;
2199
2200 #ifdef CONFIG_COMPAT
2201         case USBDEVFS_REAPURB32:
2202                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2203                 ret = proc_reapurb_compat(ps, p);
2204                 goto done;
2205
2206         case USBDEVFS_REAPURBNDELAY32:
2207                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2208                 ret = proc_reapurbnonblock_compat(ps, p);
2209                 goto done;
2210 #endif
2211         }
2212
2213         if (!connected(ps)) {
2214                 usb_unlock_device(dev);
2215                 return -ENODEV;
2216         }
2217
2218         switch (cmd) {
2219         case USBDEVFS_CONTROL:
2220                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2221                 ret = proc_control(ps, p);
2222                 if (ret >= 0)
2223                         inode->i_mtime = CURRENT_TIME;
2224                 break;
2225
2226         case USBDEVFS_BULK:
2227                 snoop(&dev->dev, "%s: BULK\n", __func__);
2228                 ret = proc_bulk(ps, p);
2229                 if (ret >= 0)
2230                         inode->i_mtime = CURRENT_TIME;
2231                 break;
2232
2233         case USBDEVFS_RESETEP:
2234                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2235                 ret = proc_resetep(ps, p);
2236                 if (ret >= 0)
2237                         inode->i_mtime = CURRENT_TIME;
2238                 break;
2239
2240         case USBDEVFS_RESET:
2241                 snoop(&dev->dev, "%s: RESET\n", __func__);
2242                 ret = proc_resetdevice(ps);
2243                 break;
2244
2245         case USBDEVFS_CLEAR_HALT:
2246                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2247                 ret = proc_clearhalt(ps, p);
2248                 if (ret >= 0)
2249                         inode->i_mtime = CURRENT_TIME;
2250                 break;
2251
2252         case USBDEVFS_GETDRIVER:
2253                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2254                 ret = proc_getdriver(ps, p);
2255                 break;
2256
2257         case USBDEVFS_CONNECTINFO:
2258                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2259                 ret = proc_connectinfo(ps, p);
2260                 break;
2261
2262         case USBDEVFS_SETINTERFACE:
2263                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2264                 ret = proc_setintf(ps, p);
2265                 break;
2266
2267         case USBDEVFS_SETCONFIGURATION:
2268                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2269                 ret = proc_setconfig(ps, p);
2270                 break;
2271
2272         case USBDEVFS_SUBMITURB:
2273                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2274                 ret = proc_submiturb(ps, p);
2275                 if (ret >= 0)
2276                         inode->i_mtime = CURRENT_TIME;
2277                 break;
2278
2279 #ifdef CONFIG_COMPAT
2280         case USBDEVFS_CONTROL32:
2281                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2282                 ret = proc_control_compat(ps, p);
2283                 if (ret >= 0)
2284                         inode->i_mtime = CURRENT_TIME;
2285                 break;
2286
2287         case USBDEVFS_BULK32:
2288                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2289                 ret = proc_bulk_compat(ps, p);
2290                 if (ret >= 0)
2291                         inode->i_mtime = CURRENT_TIME;
2292                 break;
2293
2294         case USBDEVFS_DISCSIGNAL32:
2295                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2296                 ret = proc_disconnectsignal_compat(ps, p);
2297                 break;
2298
2299         case USBDEVFS_SUBMITURB32:
2300                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2301                 ret = proc_submiturb_compat(ps, p);
2302                 if (ret >= 0)
2303                         inode->i_mtime = CURRENT_TIME;
2304                 break;
2305
2306         case USBDEVFS_IOCTL32:
2307                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2308                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2309                 break;
2310 #endif
2311
2312         case USBDEVFS_DISCARDURB:
2313                 snoop(&dev->dev, "%s: DISCARDURB\n", __func__);
2314                 ret = proc_unlinkurb(ps, p);
2315                 break;
2316
2317         case USBDEVFS_DISCSIGNAL:
2318                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2319                 ret = proc_disconnectsignal(ps, p);
2320                 break;
2321
2322         case USBDEVFS_CLAIMINTERFACE:
2323                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2324                 ret = proc_claiminterface(ps, p);
2325                 break;
2326
2327         case USBDEVFS_RELEASEINTERFACE:
2328                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2329                 ret = proc_releaseinterface(ps, p);
2330                 break;
2331
2332         case USBDEVFS_IOCTL:
2333                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2334                 ret = proc_ioctl_default(ps, p);
2335                 break;
2336
2337         case USBDEVFS_CLAIM_PORT:
2338                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2339                 ret = proc_claim_port(ps, p);
2340                 break;
2341
2342         case USBDEVFS_RELEASE_PORT:
2343                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2344                 ret = proc_release_port(ps, p);
2345                 break;
2346         case USBDEVFS_GET_CAPABILITIES:
2347                 ret = proc_get_capabilities(ps, p);
2348                 break;
2349         case USBDEVFS_DISCONNECT_CLAIM:
2350                 ret = proc_disconnect_claim(ps, p);
2351                 break;
2352         case USBDEVFS_ALLOC_STREAMS:
2353                 ret = proc_alloc_streams(ps, p);
2354                 break;
2355         case USBDEVFS_FREE_STREAMS:
2356                 ret = proc_free_streams(ps, p);
2357                 break;
2358         }
2359
2360  done:
2361         usb_unlock_device(dev);
2362         if (ret >= 0)
2363                 inode->i_atime = CURRENT_TIME;
2364         return ret;
2365 }
2366
2367 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2368                         unsigned long arg)
2369 {
2370         int ret;
2371
2372         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2373
2374         return ret;
2375 }
2376
2377 #ifdef CONFIG_COMPAT
2378 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2379                         unsigned long arg)
2380 {
2381         int ret;
2382
2383         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2384
2385         return ret;
2386 }
2387 #endif
2388
2389 /* No kernel lock - fine */
2390 static unsigned int usbdev_poll(struct file *file,
2391                                 struct poll_table_struct *wait)
2392 {
2393         struct usb_dev_state *ps = file->private_data;
2394         unsigned int mask = 0;
2395
2396         poll_wait(file, &ps->wait, wait);
2397         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2398                 mask |= POLLOUT | POLLWRNORM;
2399         if (!connected(ps))
2400                 mask |= POLLERR | POLLHUP;
2401         return mask;
2402 }
2403
2404 const struct file_operations usbdev_file_operations = {
2405         .owner =          THIS_MODULE,
2406         .llseek =         usbdev_lseek,
2407         .read =           usbdev_read,
2408         .poll =           usbdev_poll,
2409         .unlocked_ioctl = usbdev_ioctl,
2410 #ifdef CONFIG_COMPAT
2411         .compat_ioctl =   usbdev_compat_ioctl,
2412 #endif
2413         .open =           usbdev_open,
2414         .release =        usbdev_release,
2415 };
2416
2417 static void usbdev_remove(struct usb_device *udev)
2418 {
2419         struct usb_dev_state *ps;
2420         struct siginfo sinfo;
2421
2422         while (!list_empty(&udev->filelist)) {
2423                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2424                 destroy_all_async(ps);
2425                 wake_up_all(&ps->wait);
2426                 list_del_init(&ps->list);
2427                 if (ps->discsignr) {
2428                         memset(&sinfo, 0, sizeof(sinfo));
2429                         sinfo.si_signo = ps->discsignr;
2430                         sinfo.si_errno = EPIPE;
2431                         sinfo.si_code = SI_ASYNCIO;
2432                         sinfo.si_addr = ps->disccontext;
2433                         kill_pid_info_as_cred(ps->discsignr, &sinfo,
2434                                         ps->disc_pid, ps->cred, ps->secid);
2435                 }
2436         }
2437 }
2438
2439 static int usbdev_notify(struct notifier_block *self,
2440                                unsigned long action, void *dev)
2441 {
2442         switch (action) {
2443         case USB_DEVICE_ADD:
2444                 break;
2445         case USB_DEVICE_REMOVE:
2446                 usbdev_remove(dev);
2447                 break;
2448         }
2449         return NOTIFY_OK;
2450 }
2451
2452 static struct notifier_block usbdev_nb = {
2453         .notifier_call =        usbdev_notify,
2454 };
2455
2456 static struct cdev usb_device_cdev;
2457
2458 int __init usb_devio_init(void)
2459 {
2460         int retval;
2461
2462         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2463                                         "usb_device");
2464         if (retval) {
2465                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2466                 goto out;
2467         }
2468         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2469         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2470         if (retval) {
2471                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2472                        USB_DEVICE_MAJOR);
2473                 goto error_cdev;
2474         }
2475         usb_register_notify(&usbdev_nb);
2476 out:
2477         return retval;
2478
2479 error_cdev:
2480         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2481         goto out;
2482 }
2483
2484 void usb_devio_cleanup(void)
2485 {
2486         usb_unregister_notify(&usbdev_nb);
2487         cdev_del(&usb_device_cdev);
2488         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2489 }