drivers/usb/core/devio.c

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