drivers/usb/core/devio.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*****************************************************************************/
   3
   4 /*
   5  *      devio.c  --  User space communication with USB devices.
   6  *
   7  *      Copyright (C) 1999-2000  Thomas Sailer (sailer@ife.ee.ethz.ch)
   8  *
   9  *  This file implements the usbfs/x/y files, where
  10  *  x is the bus number and y the device number.
  11  *
  12  *  It allows user space programs/"drivers" to communicate directly
  13  *  with USB devices without intervening kernel driver.
  14  *
  15  *  Revision history
  16  *    22.12.1999   0.1   Initial release (split from proc_usb.c)
  17  *    04.01.2000   0.2   Turned into its own filesystem
  18  *    30.09.2005   0.3   Fix user-triggerable oops in async URB delivery
  19  *                       (CAN-2005-3055)
  20  */
  21
  22 /*****************************************************************************/
  23
  24 #include <linux/fs.h>
  25 #include <linux/mm.h>
  26 #include <linux/sched/signal.h>
  27 #include <linux/slab.h>
  28 #include <linux/signal.h>
  29 #include <linux/poll.h>
  30 #include <linux/module.h>
  31 #include <linux/string.h>
  32 #include <linux/usb.h>
  33 #include <linux/usbdevice_fs.h>
  34 #include <linux/usb/hcd.h>      /* for usbcore internals */
  35 #include <linux/cdev.h>
  36 #include <linux/notifier.h>
  37 #include <linux/security.h>
  38 #include <linux/user_namespace.h>
  39 #include <linux/scatterlist.h>
  40 #include <linux/uaccess.h>
  41 #include <linux/dma-mapping.h>
  42 #include <asm/byteorder.h>
  43 #include <linux/moduleparam.h>
  44
  45 #include "usb.h"
  46
  47 #ifdef CONFIG_PM
  48 #define MAYBE_CAP_SUSPEND       USBDEVFS_CAP_SUSPEND
  49 #else
  50 #define MAYBE_CAP_SUSPEND       0
  51 #endif
  52
  53 #define USB_MAXBUS                      64
  54 #define USB_DEVICE_MAX                  (USB_MAXBUS * 128)
  55 #define USB_SG_SIZE                     16384 /* split-size for large txs */
  56
  57 /* Mutual exclusion for ps->list in resume vs. release and remove */
  58 static DEFINE_MUTEX(usbfs_mutex);
  59
  60 struct usb_dev_state {
  61         struct list_head list;      /* state list */
  62         struct usb_device *dev;
  63         struct file *file;
  64         spinlock_t lock;            /* protects the async urb lists */
  65         struct list_head async_pending;
  66         struct list_head async_completed;
  67         struct list_head memory_list;
  68         wait_queue_head_t wait;     /* wake up if a request completed */
  69         wait_queue_head_t wait_for_resume;   /* wake up upon runtime resume */
  70         unsigned int discsignr;
  71         struct pid *disc_pid;
  72         const struct cred *cred;
  73         sigval_t disccontext;
  74         unsigned long ifclaimed;
  75         u32 disabled_bulk_eps;
  76         unsigned long interface_allowed_mask;
  77         int not_yet_resumed;
  78         bool suspend_allowed;
  79         bool privileges_dropped;
  80 };
  81
  82 struct usb_memory {
  83         struct list_head memlist;
  84         int vma_use_count;
  85         int urb_use_count;
  86         u32 size;
  87         void *mem;
  88         dma_addr_t dma_handle;
  89         unsigned long vm_start;
  90         struct usb_dev_state *ps;
  91 };
  92
  93 struct async {
  94         struct list_head asynclist;
  95         struct usb_dev_state *ps;
  96         struct pid *pid;
  97         const struct cred *cred;
  98         unsigned int signr;
  99         unsigned int ifnum;
 100         void __user *userbuffer;
 101         void __user *userurb;
 102         sigval_t userurb_sigval;
 103         struct urb *urb;
 104         struct usb_memory *usbm;
 105         unsigned int mem_usage;
 106         int status;
 107         u8 bulk_addr;
 108         u8 bulk_status;
 109 };
 110
 111 static bool usbfs_snoop;
 112 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
 113 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
 114
 115 static unsigned usbfs_snoop_max = 65536;
 116 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
 117 MODULE_PARM_DESC(usbfs_snoop_max,
 118                 "maximum number of bytes to print while snooping");
 119
 120 #define snoop(dev, format, arg...)                              \
 121         do {                                                    \
 122                 if (usbfs_snoop)                                \
 123                         dev_info(dev, format, ## arg);          \
 124         } while (0)
 125
 126 enum snoop_when {
 127         SUBMIT, COMPLETE
 128 };
 129
 130 #define USB_DEVICE_DEV          MKDEV(USB_DEVICE_MAJOR, 0)
 131
 132 /* Limit on the total amount of memory we can allocate for transfers */
 133 static u32 usbfs_memory_mb = 16;
 134 module_param(usbfs_memory_mb, uint, 0644);
 135 MODULE_PARM_DESC(usbfs_memory_mb,
 136                 "maximum MB allowed for usbfs buffers (0 = no limit)");
 137
 138 /* Hard limit, necessary to avoid arithmetic overflow */
 139 #define USBFS_XFER_MAX         (UINT_MAX / 2 - 1000000)
 140
 141 static atomic64_t usbfs_memory_usage;   /* Total memory currently allocated */
 142
 143 /* Check whether it's okay to allocate more memory for a transfer */
 144 static int usbfs_increase_memory_usage(u64 amount)
 145 {
 146         u64 lim;
 147
 148         lim = READ_ONCE(usbfs_memory_mb);
 149         lim <<= 20;
 150
 151         atomic64_add(amount, &usbfs_memory_usage);
 152
 153         if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
 154                 atomic64_sub(amount, &usbfs_memory_usage);
 155                 return -ENOMEM;
 156         }
 157
 158         return 0;
 159 }
 160
 161 /* Memory for a transfer is being deallocated */
 162 static void usbfs_decrease_memory_usage(u64 amount)
 163 {
 164         atomic64_sub(amount, &usbfs_memory_usage);
 165 }
 166
 167 static int connected(struct usb_dev_state *ps)
 168 {
 169         return (!list_empty(&ps->list) &&
 170                         ps->dev->state != USB_STATE_NOTATTACHED);
 171 }
 172
 173 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
 174 {
 175         struct usb_dev_state *ps = usbm->ps;
 176         unsigned long flags;
 177
 178         spin_lock_irqsave(&ps->lock, flags);
 179         --*count;
 180         if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
 181                 list_del(&usbm->memlist);
 182                 spin_unlock_irqrestore(&ps->lock, flags);
 183
 184                 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
 185                                 usbm->dma_handle);
 186                 usbfs_decrease_memory_usage(
 187                         usbm->size + sizeof(struct usb_memory));
 188                 kfree(usbm);
 189         } else {
 190                 spin_unlock_irqrestore(&ps->lock, flags);
 191         }
 192 }
 193
 194 static void usbdev_vm_open(struct vm_area_struct *vma)
 195 {
 196         struct usb_memory *usbm = vma->vm_private_data;
 197         unsigned long flags;
 198
 199         spin_lock_irqsave(&usbm->ps->lock, flags);
 200         ++usbm->vma_use_count;
 201         spin_unlock_irqrestore(&usbm->ps->lock, flags);
 202 }
 203
 204 static void usbdev_vm_close(struct vm_area_struct *vma)
 205 {
 206         struct usb_memory *usbm = vma->vm_private_data;
 207
 208         dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 209 }
 210
 211 static const struct vm_operations_struct usbdev_vm_ops = {
 212         .open = usbdev_vm_open,
 213         .close = usbdev_vm_close
 214 };
 215
 216 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
 217 {
 218         struct usb_memory *usbm = NULL;
 219         struct usb_dev_state *ps = file->private_data;
 220         size_t size = vma->vm_end - vma->vm_start;
 221         void *mem;
 222         unsigned long flags;
 223         dma_addr_t dma_handle;
 224         int ret;
 225
 226         ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
 227         if (ret)
 228                 goto error;
 229
 230         usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
 231         if (!usbm) {
 232                 ret = -ENOMEM;
 233                 goto error_decrease_mem;
 234         }
 235
 236         mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
 237                         &dma_handle);
 238         if (!mem) {
 239                 ret = -ENOMEM;
 240                 goto error_free_usbm;
 241         }
 242
 243         memset(mem, 0, size);
 244
 245         usbm->mem = mem;
 246         usbm->dma_handle = dma_handle;
 247         usbm->size = size;
 248         usbm->ps = ps;
 249         usbm->vm_start = vma->vm_start;
 250         usbm->vma_use_count = 1;
 251         INIT_LIST_HEAD(&usbm->memlist);
 252
 253         if (remap_pfn_range(vma, vma->vm_start,
 254                         virt_to_phys(usbm->mem) >> PAGE_SHIFT,
 255                         size, vma->vm_page_prot) < 0) {
 256                 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
 257                 return -EAGAIN;
 258         }
 259
 260         vma->vm_flags |= VM_IO;
 261         vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
 262         vma->vm_ops = &usbdev_vm_ops;
 263         vma->vm_private_data = usbm;
 264
 265         spin_lock_irqsave(&ps->lock, flags);
 266         list_add_tail(&usbm->memlist, &ps->memory_list);
 267         spin_unlock_irqrestore(&ps->lock, flags);
 268
 269         return 0;
 270
 271 error_free_usbm:
 272         kfree(usbm);
 273 error_decrease_mem:
 274         usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
 275 error:
 276         return ret;
 277 }
 278
 279 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
 280                            loff_t *ppos)
 281 {
 282         struct usb_dev_state *ps = file->private_data;
 283         struct usb_device *dev = ps->dev;
 284         ssize_t ret = 0;
 285         unsigned len;
 286         loff_t pos;
 287         int i;
 288
 289         pos = *ppos;
 290         usb_lock_device(dev);
 291         if (!connected(ps)) {
 292                 ret = -ENODEV;
 293                 goto err;
 294         } else if (pos < 0) {
 295                 ret = -EINVAL;
 296                 goto err;
 297         }
 298
 299         if (pos < sizeof(struct usb_device_descriptor)) {
 300                 /* 18 bytes - fits on the stack */
 301                 struct usb_device_descriptor temp_desc;
 302
 303                 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
 304                 le16_to_cpus(&temp_desc.bcdUSB);
 305                 le16_to_cpus(&temp_desc.idVendor);
 306                 le16_to_cpus(&temp_desc.idProduct);
 307                 le16_to_cpus(&temp_desc.bcdDevice);
 308
 309                 len = sizeof(struct usb_device_descriptor) - pos;
 310                 if (len > nbytes)
 311                         len = nbytes;
 312                 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
 313                         ret = -EFAULT;
 314                         goto err;
 315                 }
 316
 317                 *ppos += len;
 318                 buf += len;
 319                 nbytes -= len;
 320                 ret += len;
 321         }
 322
 323         pos = sizeof(struct usb_device_descriptor);
 324         for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
 325                 struct usb_config_descriptor *config =
 326                         (struct usb_config_descriptor *)dev->rawdescriptors[i];
 327                 unsigned int length = le16_to_cpu(config->wTotalLength);
 328
 329                 if (*ppos < pos + length) {
 330
 331                         /* The descriptor may claim to be longer than it
 332                          * really is.  Here is the actual allocated length. */
 333                         unsigned alloclen =
 334                                 le16_to_cpu(dev->config[i].desc.wTotalLength);
 335
 336                         len = length - (*ppos - pos);
 337                         if (len > nbytes)
 338                                 len = nbytes;
 339
 340                         /* Simply don't write (skip over) unallocated parts */
 341                         if (alloclen > (*ppos - pos)) {
 342                                 alloclen -= (*ppos - pos);
 343                                 if (copy_to_user(buf,
 344                                     dev->rawdescriptors[i] + (*ppos - pos),
 345                                     min(len, alloclen))) {
 346                                         ret = -EFAULT;
 347                                         goto err;
 348                                 }
 349                         }
 350
 351                         *ppos += len;
 352                         buf += len;
 353                         nbytes -= len;
 354                         ret += len;
 355                 }
 356
 357                 pos += length;
 358         }
 359
 360 err:
 361         usb_unlock_device(dev);
 362         return ret;
 363 }
 364
 365 /*
 366  * async list handling
 367  */
 368
 369 static struct async *alloc_async(unsigned int numisoframes)
 370 {
 371         struct async *as;
 372
 373         as = kzalloc(sizeof(struct async), GFP_KERNEL);
 374         if (!as)
 375                 return NULL;
 376         as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
 377         if (!as->urb) {
 378                 kfree(as);
 379                 return NULL;
 380         }
 381         return as;
 382 }
 383
 384 static void free_async(struct async *as)
 385 {
 386         int i;
 387
 388         put_pid(as->pid);
 389         if (as->cred)
 390                 put_cred(as->cred);
 391         for (i = 0; i < as->urb->num_sgs; i++) {
 392                 if (sg_page(&as->urb->sg[i]))
 393                         kfree(sg_virt(&as->urb->sg[i]));
 394         }
 395
 396         kfree(as->urb->sg);
 397         if (as->usbm == NULL)
 398                 kfree(as->urb->transfer_buffer);
 399         else
 400                 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
 401
 402         kfree(as->urb->setup_packet);
 403         usb_free_urb(as->urb);
 404         usbfs_decrease_memory_usage(as->mem_usage);
 405         kfree(as);
 406 }
 407
 408 static void async_newpending(struct async *as)
 409 {
 410         struct usb_dev_state *ps = as->ps;
 411         unsigned long flags;
 412
 413         spin_lock_irqsave(&ps->lock, flags);
 414         list_add_tail(&as->asynclist, &ps->async_pending);
 415         spin_unlock_irqrestore(&ps->lock, flags);
 416 }
 417
 418 static void async_removepending(struct async *as)
 419 {
 420         struct usb_dev_state *ps = as->ps;
 421         unsigned long flags;
 422
 423         spin_lock_irqsave(&ps->lock, flags);
 424         list_del_init(&as->asynclist);
 425         spin_unlock_irqrestore(&ps->lock, flags);
 426 }
 427
 428 static struct async *async_getcompleted(struct usb_dev_state *ps)
 429 {
 430         unsigned long flags;
 431         struct async *as = NULL;
 432
 433         spin_lock_irqsave(&ps->lock, flags);
 434         if (!list_empty(&ps->async_completed)) {
 435                 as = list_entry(ps->async_completed.next, struct async,
 436                                 asynclist);
 437                 list_del_init(&as->asynclist);
 438         }
 439         spin_unlock_irqrestore(&ps->lock, flags);
 440         return as;
 441 }
 442
 443 static struct async *async_getpending(struct usb_dev_state *ps,
 444                                              void __user *userurb)
 445 {
 446         struct async *as;
 447
 448         list_for_each_entry(as, &ps->async_pending, asynclist)
 449                 if (as->userurb == userurb) {
 450                         list_del_init(&as->asynclist);
 451                         return as;
 452                 }
 453
 454         return NULL;
 455 }
 456
 457 static void snoop_urb(struct usb_device *udev,
 458                 void __user *userurb, int pipe, unsigned length,
 459                 int timeout_or_status, enum snoop_when when,
 460                 unsigned char *data, unsigned data_len)
 461 {
 462         static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
 463         static const char *dirs[] = {"out", "in"};
 464         int ep;
 465         const char *t, *d;
 466
 467         if (!usbfs_snoop)
 468                 return;
 469
 470         ep = usb_pipeendpoint(pipe);
 471         t = types[usb_pipetype(pipe)];
 472         d = dirs[!!usb_pipein(pipe)];
 473
 474         if (userurb) {          /* Async */
 475                 if (when == SUBMIT)
 476                         dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
 477                                         "length %u\n",
 478                                         userurb, ep, t, d, length);
 479                 else
 480                         dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
 481                                         "actual_length %u status %d\n",
 482                                         userurb, ep, t, d, length,
 483                                         timeout_or_status);
 484         } else {
 485                 if (when == SUBMIT)
 486                         dev_info(&udev->dev, "ep%d %s-%s, length %u, "
 487                                         "timeout %d\n",
 488                                         ep, t, d, length, timeout_or_status);
 489                 else
 490                         dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
 491                                         "status %d\n",
 492                                         ep, t, d, length, timeout_or_status);
 493         }
 494
 495         data_len = min(data_len, usbfs_snoop_max);
 496         if (data && data_len > 0) {
 497                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 498                         data, data_len, 1);
 499         }
 500 }
 501
 502 static void snoop_urb_data(struct urb *urb, unsigned len)
 503 {
 504         int i, size;
 505
 506         len = min(len, usbfs_snoop_max);
 507         if (!usbfs_snoop || len == 0)
 508                 return;
 509
 510         if (urb->num_sgs == 0) {
 511                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 512                         urb->transfer_buffer, len, 1);
 513                 return;
 514         }
 515
 516         for (i = 0; i < urb->num_sgs && len; i++) {
 517                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 518                 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
 519                         sg_virt(&urb->sg[i]), size, 1);
 520                 len -= size;
 521         }
 522 }
 523
 524 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
 525 {
 526         unsigned i, len, size;
 527
 528         if (urb->number_of_packets > 0)         /* Isochronous */
 529                 len = urb->transfer_buffer_length;
 530         else                                    /* Non-Isoc */
 531                 len = urb->actual_length;
 532
 533         if (urb->num_sgs == 0) {
 534                 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
 535                         return -EFAULT;
 536                 return 0;
 537         }
 538
 539         for (i = 0; i < urb->num_sgs && len; i++) {
 540                 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
 541                 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
 542                         return -EFAULT;
 543                 userbuffer += size;
 544                 len -= size;
 545         }
 546
 547         return 0;
 548 }
 549
 550 #define AS_CONTINUATION 1
 551 #define AS_UNLINK       2
 552
 553 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
 554 __releases(ps->lock)
 555 __acquires(ps->lock)
 556 {
 557         struct urb *urb;
 558         struct async *as;
 559
 560         /* Mark all the pending URBs that match bulk_addr, up to but not
 561          * including the first one without AS_CONTINUATION.  If such an
 562          * URB is encountered then a new transfer has already started so
 563          * the endpoint doesn't need to be disabled; otherwise it does.
 564          */
 565         list_for_each_entry(as, &ps->async_pending, asynclist) {
 566                 if (as->bulk_addr == bulk_addr) {
 567                         if (as->bulk_status != AS_CONTINUATION)
 568                                 goto rescan;
 569                         as->bulk_status = AS_UNLINK;
 570                         as->bulk_addr = 0;
 571                 }
 572         }
 573         ps->disabled_bulk_eps |= (1 << bulk_addr);
 574
 575         /* Now carefully unlink all the marked pending URBs */
 576  rescan:
 577         list_for_each_entry(as, &ps->async_pending, asynclist) {
 578                 if (as->bulk_status == AS_UNLINK) {
 579                         as->bulk_status = 0;            /* Only once */
 580                         urb = as->urb;
 581                         usb_get_urb(urb);
 582                         spin_unlock(&ps->lock);         /* Allow completions */
 583                         usb_unlink_urb(urb);
 584                         usb_put_urb(urb);
 585                         spin_lock(&ps->lock);
 586                         goto rescan;
 587                 }
 588         }
 589 }
 590
 591 static void async_completed(struct urb *urb)
 592 {
 593         struct async *as = urb->context;
 594         struct usb_dev_state *ps = as->ps;
 595         struct pid *pid = NULL;
 596         const struct cred *cred = NULL;
 597         unsigned long flags;
 598         sigval_t addr;
 599         int signr, errno;
 600
 601         spin_lock_irqsave(&ps->lock, flags);
 602         list_move_tail(&as->asynclist, &ps->async_completed);
 603         as->status = urb->status;
 604         signr = as->signr;
 605         if (signr) {
 606                 errno = as->status;
 607                 addr = as->userurb_sigval;
 608                 pid = get_pid(as->pid);
 609                 cred = get_cred(as->cred);
 610         }
 611         snoop(&urb->dev->dev, "urb complete\n");
 612         snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
 613                         as->status, COMPLETE, NULL, 0);
 614         if (usb_urb_dir_in(urb))
 615                 snoop_urb_data(urb, urb->actual_length);
 616
 617         if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
 618                         as->status != -ENOENT)
 619                 cancel_bulk_urbs(ps, as->bulk_addr);
 620
 621         wake_up(&ps->wait);
 622         spin_unlock_irqrestore(&ps->lock, flags);
 623
 624         if (signr) {
 625                 kill_pid_usb_asyncio(signr, errno, addr, pid, cred);
 626                 put_pid(pid);
 627                 put_cred(cred);
 628         }
 629 }
 630
 631 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
 632 {
 633         struct urb *urb;
 634         struct async *as;
 635         unsigned long flags;
 636
 637         spin_lock_irqsave(&ps->lock, flags);
 638         while (!list_empty(list)) {
 639                 as = list_entry(list->next, struct async, asynclist);
 640                 list_del_init(&as->asynclist);
 641                 urb = as->urb;
 642                 usb_get_urb(urb);
 643
 644                 /* drop the spinlock so the completion handler can run */
 645                 spin_unlock_irqrestore(&ps->lock, flags);
 646                 usb_kill_urb(urb);
 647                 usb_put_urb(urb);
 648                 spin_lock_irqsave(&ps->lock, flags);
 649         }
 650         spin_unlock_irqrestore(&ps->lock, flags);
 651 }
 652
 653 static void destroy_async_on_interface(struct usb_dev_state *ps,
 654                                        unsigned int ifnum)
 655 {
 656         struct list_head *p, *q, hitlist;
 657         unsigned long flags;
 658
 659         INIT_LIST_HEAD(&hitlist);
 660         spin_lock_irqsave(&ps->lock, flags);
 661         list_for_each_safe(p, q, &ps->async_pending)
 662                 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
 663                         list_move_tail(p, &hitlist);
 664         spin_unlock_irqrestore(&ps->lock, flags);
 665         destroy_async(ps, &hitlist);
 666 }
 667
 668 static void destroy_all_async(struct usb_dev_state *ps)
 669 {
 670         destroy_async(ps, &ps->async_pending);
 671 }
 672
 673 /*
 674  * interface claims are made only at the request of user level code,
 675  * which can also release them (explicitly or by closing files).
 676  * they're also undone when devices disconnect.
 677  */
 678
 679 static int driver_probe(struct usb_interface *intf,
 680                         const struct usb_device_id *id)
 681 {
 682         return -ENODEV;
 683 }
 684
 685 static void driver_disconnect(struct usb_interface *intf)
 686 {
 687         struct usb_dev_state *ps = usb_get_intfdata(intf);
 688         unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
 689
 690         if (!ps)
 691                 return;
 692
 693         /* NOTE:  this relies on usbcore having canceled and completed
 694          * all pending I/O requests; 2.6 does that.
 695          */
 696
 697         if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
 698                 clear_bit(ifnum, &ps->ifclaimed);
 699         else
 700                 dev_warn(&intf->dev, "interface number %u out of range\n",
 701                          ifnum);
 702
 703         usb_set_intfdata(intf, NULL);
 704
 705         /* force async requests to complete */
 706         destroy_async_on_interface(ps, ifnum);
 707 }
 708
 709 /* We don't care about suspend/resume of claimed interfaces */
 710 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
 711 {
 712         return 0;
 713 }
 714
 715 static int driver_resume(struct usb_interface *intf)
 716 {
 717         return 0;
 718 }
 719
 720 /* The following routines apply to the entire device, not interfaces */
 721 void usbfs_notify_suspend(struct usb_device *udev)
 722 {
 723         /* We don't need to handle this */
 724 }
 725
 726 void usbfs_notify_resume(struct usb_device *udev)
 727 {
 728         struct usb_dev_state *ps;
 729
 730         /* Protect against simultaneous remove or release */
 731         mutex_lock(&usbfs_mutex);
 732         list_for_each_entry(ps, &udev->filelist, list) {
 733                 WRITE_ONCE(ps->not_yet_resumed, 0);
 734                 wake_up_all(&ps->wait_for_resume);
 735         }
 736         mutex_unlock(&usbfs_mutex);
 737 }
 738
 739 struct usb_driver usbfs_driver = {
 740         .name =         "usbfs",
 741         .probe =        driver_probe,
 742         .disconnect =   driver_disconnect,
 743         .suspend =      driver_suspend,
 744         .resume =       driver_resume,
 745         .supports_autosuspend = 1,
 746 };
 747
 748 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
 749 {
 750         struct usb_device *dev = ps->dev;
 751         struct usb_interface *intf;
 752         int err;
 753
 754         if (ifnum >= 8*sizeof(ps->ifclaimed))
 755                 return -EINVAL;
 756         /* already claimed */
 757         if (test_bit(ifnum, &ps->ifclaimed))
 758                 return 0;
 759
 760         if (ps->privileges_dropped &&
 761                         !test_bit(ifnum, &ps->interface_allowed_mask))
 762                 return -EACCES;
 763
 764         intf = usb_ifnum_to_if(dev, ifnum);
 765         if (!intf)
 766                 err = -ENOENT;
 767         else
 768                 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
 769         if (err == 0)
 770                 set_bit(ifnum, &ps->ifclaimed);
 771         return err;
 772 }
 773
 774 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
 775 {
 776         struct usb_device *dev;
 777         struct usb_interface *intf;
 778         int err;
 779
 780         err = -EINVAL;
 781         if (ifnum >= 8*sizeof(ps->ifclaimed))
 782                 return err;
 783         dev = ps->dev;
 784         intf = usb_ifnum_to_if(dev, ifnum);
 785         if (!intf)
 786                 err = -ENOENT;
 787         else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
 788                 usb_driver_release_interface(&usbfs_driver, intf);
 789                 err = 0;
 790         }
 791         return err;
 792 }
 793
 794 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
 795 {
 796         if (ps->dev->state != USB_STATE_CONFIGURED)
 797                 return -EHOSTUNREACH;
 798         if (ifnum >= 8*sizeof(ps->ifclaimed))
 799                 return -EINVAL;
 800         if (test_bit(ifnum, &ps->ifclaimed))
 801                 return 0;
 802         /* if not yet claimed, claim it for the driver */
 803         dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
 804                  "interface %u before use\n", task_pid_nr(current),
 805                  current->comm, ifnum);
 806         return claimintf(ps, ifnum);
 807 }
 808
 809 static int findintfep(struct usb_device *dev, unsigned int ep)
 810 {
 811         unsigned int i, j, e;
 812         struct usb_interface *intf;
 813         struct usb_host_interface *alts;
 814         struct usb_endpoint_descriptor *endpt;
 815
 816         if (ep & ~(USB_DIR_IN|0xf))
 817                 return -EINVAL;
 818         if (!dev->actconfig)
 819                 return -ESRCH;
 820         for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
 821                 intf = dev->actconfig->interface[i];
 822                 for (j = 0; j < intf->num_altsetting; j++) {
 823                         alts = &intf->altsetting[j];
 824                         for (e = 0; e < alts->desc.bNumEndpoints; e++) {
 825                                 endpt = &alts->endpoint[e].desc;
 826                                 if (endpt->bEndpointAddress == ep)
 827                                         return alts->desc.bInterfaceNumber;
 828                         }
 829                 }
 830         }
 831         return -ENOENT;
 832 }
 833
 834 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
 835                            unsigned int request, unsigned int index)
 836 {
 837         int ret = 0;
 838         struct usb_host_interface *alt_setting;
 839
 840         if (ps->dev->state != USB_STATE_UNAUTHENTICATED
 841          && ps->dev->state != USB_STATE_ADDRESS
 842          && ps->dev->state != USB_STATE_CONFIGURED)
 843                 return -EHOSTUNREACH;
 844         if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
 845                 return 0;
 846
 847         /*
 848          * check for the special corner case 'get_device_id' in the printer
 849          * class specification, which we always want to allow as it is used
 850          * to query things like ink level, etc.
 851          */
 852         if (requesttype == 0xa1 && request == 0) {
 853                 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
 854                                                    index >> 8, index & 0xff);
 855                 if (alt_setting
 856                  && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
 857                         return 0;
 858         }
 859
 860         index &= 0xff;
 861         switch (requesttype & USB_RECIP_MASK) {
 862         case USB_RECIP_ENDPOINT:
 863                 if ((index & ~USB_DIR_IN) == 0)
 864                         return 0;
 865                 ret = findintfep(ps->dev, index);
 866                 if (ret < 0) {
 867                         /*
 868                          * Some not fully compliant Win apps seem to get
 869                          * index wrong and have the endpoint number here
 870                          * rather than the endpoint address (with the
 871                          * correct direction). Win does let this through,
 872                          * so we'll not reject it here but leave it to
 873                          * the device to not break KVM. But we warn.
 874                          */
 875                         ret = findintfep(ps->dev, index ^ 0x80);
 876                         if (ret >= 0)
 877                                 dev_info(&ps->dev->dev,
 878                                         "%s: process %i (%s) requesting ep %02x but needs %02x\n",
 879                                         __func__, task_pid_nr(current),
 880                                         current->comm, index, index ^ 0x80);
 881                 }
 882                 if (ret >= 0)
 883                         ret = checkintf(ps, ret);
 884                 break;
 885
 886         case USB_RECIP_INTERFACE:
 887                 ret = checkintf(ps, index);
 888                 break;
 889         }
 890         return ret;
 891 }
 892
 893 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
 894                                                      unsigned char ep)
 895 {
 896         if (ep & USB_ENDPOINT_DIR_MASK)
 897                 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
 898         else
 899                 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
 900 }
 901
 902 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
 903                                   struct usbdevfs_streams __user *streams,
 904                                   unsigned int *num_streams_ret,
 905                                   unsigned int *num_eps_ret,
 906                                   struct usb_host_endpoint ***eps_ret,
 907                                   struct usb_interface **intf_ret)
 908 {
 909         unsigned int i, num_streams, num_eps;
 910         struct usb_host_endpoint **eps;
 911         struct usb_interface *intf = NULL;
 912         unsigned char ep;
 913         int ifnum, ret;
 914
 915         if (get_user(num_streams, &streams->num_streams) ||
 916             get_user(num_eps, &streams->num_eps))
 917                 return -EFAULT;
 918
 919         if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
 920                 return -EINVAL;
 921
 922         /* The XHCI controller allows max 2 ^ 16 streams */
 923         if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
 924                 return -EINVAL;
 925
 926         eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
 927         if (!eps)
 928                 return -ENOMEM;
 929
 930         for (i = 0; i < num_eps; i++) {
 931                 if (get_user(ep, &streams->eps[i])) {
 932                         ret = -EFAULT;
 933                         goto error;
 934                 }
 935                 eps[i] = ep_to_host_endpoint(ps->dev, ep);
 936                 if (!eps[i]) {
 937                         ret = -EINVAL;
 938                         goto error;
 939                 }
 940
 941                 /* usb_alloc/free_streams operate on an usb_interface */
 942                 ifnum = findintfep(ps->dev, ep);
 943                 if (ifnum < 0) {
 944                         ret = ifnum;
 945                         goto error;
 946                 }
 947
 948                 if (i == 0) {
 949                         ret = checkintf(ps, ifnum);
 950                         if (ret < 0)
 951                                 goto error;
 952                         intf = usb_ifnum_to_if(ps->dev, ifnum);
 953                 } else {
 954                         /* Verify all eps belong to the same interface */
 955                         if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
 956                                 ret = -EINVAL;
 957                                 goto error;
 958                         }
 959                 }
 960         }
 961
 962         if (num_streams_ret)
 963                 *num_streams_ret = num_streams;
 964         *num_eps_ret = num_eps;
 965         *eps_ret = eps;
 966         *intf_ret = intf;
 967
 968         return 0;
 969
 970 error:
 971         kfree(eps);
 972         return ret;
 973 }
 974
 975 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
 976 {
 977         struct device *dev;
 978
 979         dev = bus_find_device_by_devt(&usb_bus_type, devt);
 980         if (!dev)
 981                 return NULL;
 982         return to_usb_device(dev);
 983 }
 984
 985 /*
 986  * file operations
 987  */
 988 static int usbdev_open(struct inode *inode, struct file *file)
 989 {
 990         struct usb_device *dev = NULL;
 991         struct usb_dev_state *ps;
 992         int ret;
 993
 994         ret = -ENOMEM;
 995         ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
 996         if (!ps)
 997                 goto out_free_ps;
 998
 999         ret = -ENODEV;
1000
1001         /* usbdev device-node */
1002         if (imajor(inode) == USB_DEVICE_MAJOR)
1003                 dev = usbdev_lookup_by_devt(inode->i_rdev);
1004         if (!dev)
1005                 goto out_free_ps;
1006
1007         usb_lock_device(dev);
1008         if (dev->state == USB_STATE_NOTATTACHED)
1009                 goto out_unlock_device;
1010
1011         ret = usb_autoresume_device(dev);
1012         if (ret)
1013                 goto out_unlock_device;
1014
1015         ps->dev = dev;
1016         ps->file = file;
1017         ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1018         spin_lock_init(&ps->lock);
1019         INIT_LIST_HEAD(&ps->list);
1020         INIT_LIST_HEAD(&ps->async_pending);
1021         INIT_LIST_HEAD(&ps->async_completed);
1022         INIT_LIST_HEAD(&ps->memory_list);
1023         init_waitqueue_head(&ps->wait);
1024         init_waitqueue_head(&ps->wait_for_resume);
1025         ps->disc_pid = get_pid(task_pid(current));
1026         ps->cred = get_current_cred();
1027         smp_wmb();
1028
1029         /* Can't race with resume; the device is already active */
1030         list_add_tail(&ps->list, &dev->filelist);
1031         file->private_data = ps;
1032         usb_unlock_device(dev);
1033         snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1034                         current->comm);
1035         return ret;
1036
1037  out_unlock_device:
1038         usb_unlock_device(dev);
1039         usb_put_dev(dev);
1040  out_free_ps:
1041         kfree(ps);
1042         return ret;
1043 }
1044
1045 static int usbdev_release(struct inode *inode, struct file *file)
1046 {
1047         struct usb_dev_state *ps = file->private_data;
1048         struct usb_device *dev = ps->dev;
1049         unsigned int ifnum;
1050         struct async *as;
1051
1052         usb_lock_device(dev);
1053         usb_hub_release_all_ports(dev, ps);
1054
1055         /* Protect against simultaneous resume */
1056         mutex_lock(&usbfs_mutex);
1057         list_del_init(&ps->list);
1058         mutex_unlock(&usbfs_mutex);
1059
1060         for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1061                         ifnum++) {
1062                 if (test_bit(ifnum, &ps->ifclaimed))
1063                         releaseintf(ps, ifnum);
1064         }
1065         destroy_all_async(ps);
1066         if (!ps->suspend_allowed)
1067                 usb_autosuspend_device(dev);
1068         usb_unlock_device(dev);
1069         usb_put_dev(dev);
1070         put_pid(ps->disc_pid);
1071         put_cred(ps->cred);
1072
1073         as = async_getcompleted(ps);
1074         while (as) {
1075                 free_async(as);
1076                 as = async_getcompleted(ps);
1077         }
1078
1079         kfree(ps);
1080         return 0;
1081 }
1082
1083 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1084 {
1085         struct usb_device *dev = ps->dev;
1086         struct usbdevfs_ctrltransfer ctrl;
1087         unsigned int tmo;
1088         unsigned char *tbuf;
1089         unsigned wLength;
1090         int i, pipe, ret;
1091
1092         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1093                 return -EFAULT;
1094         ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1095                               ctrl.wIndex);
1096         if (ret)
1097                 return ret;
1098         wLength = ctrl.wLength;         /* To suppress 64k PAGE_SIZE warning */
1099         if (wLength > PAGE_SIZE)
1100                 return -EINVAL;
1101         ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1102                         sizeof(struct usb_ctrlrequest));
1103         if (ret)
1104                 return ret;
1105         tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1106         if (!tbuf) {
1107                 ret = -ENOMEM;
1108                 goto done;
1109         }
1110         tmo = ctrl.timeout;
1111         snoop(&dev->dev, "control urb: bRequestType=%02x "
1112                 "bRequest=%02x wValue=%04x "
1113                 "wIndex=%04x wLength=%04x\n",
1114                 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1115                 ctrl.wIndex, ctrl.wLength);
1116         if (ctrl.bRequestType & 0x80) {
1117                 if (ctrl.wLength && !access_ok(ctrl.data,
1118                                                ctrl.wLength)) {
1119                         ret = -EINVAL;
1120                         goto done;
1121                 }
1122                 pipe = usb_rcvctrlpipe(dev, 0);
1123                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1124
1125                 usb_unlock_device(dev);
1126                 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1127                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1128                                     tbuf, ctrl.wLength, tmo);
1129                 usb_lock_device(dev);
1130                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1131                           tbuf, max(i, 0));
1132                 if ((i > 0) && ctrl.wLength) {
1133                         if (copy_to_user(ctrl.data, tbuf, i)) {
1134                                 ret = -EFAULT;
1135                                 goto done;
1136                         }
1137                 }
1138         } else {
1139                 if (ctrl.wLength) {
1140                         if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1141                                 ret = -EFAULT;
1142                                 goto done;
1143                         }
1144                 }
1145                 pipe = usb_sndctrlpipe(dev, 0);
1146                 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1147                         tbuf, ctrl.wLength);
1148
1149                 usb_unlock_device(dev);
1150                 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1151                                     ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1152                                     tbuf, ctrl.wLength, tmo);
1153                 usb_lock_device(dev);
1154                 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1155         }
1156         if (i < 0 && i != -EPIPE) {
1157                 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1158                            "failed cmd %s rqt %u rq %u len %u ret %d\n",
1159                            current->comm, ctrl.bRequestType, ctrl.bRequest,
1160                            ctrl.wLength, i);
1161         }
1162         ret = i;
1163  done:
1164         free_page((unsigned long) tbuf);
1165         usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1166                         sizeof(struct usb_ctrlrequest));
1167         return ret;
1168 }
1169
1170 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1171 {
1172         struct usb_device *dev = ps->dev;
1173         struct usbdevfs_bulktransfer bulk;
1174         unsigned int tmo, len1, pipe;
1175         int len2;
1176         unsigned char *tbuf;
1177         int i, ret;
1178
1179         if (copy_from_user(&bulk, arg, sizeof(bulk)))
1180                 return -EFAULT;
1181         ret = findintfep(ps->dev, bulk.ep);
1182         if (ret < 0)
1183                 return ret;
1184         ret = checkintf(ps, ret);
1185         if (ret)
1186                 return ret;
1187         if (bulk.ep & USB_DIR_IN)
1188                 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1189         else
1190                 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1191         if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1192                 return -EINVAL;
1193         len1 = bulk.len;
1194         if (len1 >= (INT_MAX - sizeof(struct urb)))
1195                 return -EINVAL;
1196         ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1197         if (ret)
1198                 return ret;
1199         tbuf = kmalloc(len1, GFP_KERNEL);
1200         if (!tbuf) {
1201                 ret = -ENOMEM;
1202                 goto done;
1203         }
1204         tmo = bulk.timeout;
1205         if (bulk.ep & 0x80) {
1206                 if (len1 && !access_ok(bulk.data, len1)) {
1207                         ret = -EINVAL;
1208                         goto done;
1209                 }
1210                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1211
1212                 usb_unlock_device(dev);
1213                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1214                 usb_lock_device(dev);
1215                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1216
1217                 if (!i && len2) {
1218                         if (copy_to_user(bulk.data, tbuf, len2)) {
1219                                 ret = -EFAULT;
1220                                 goto done;
1221                         }
1222                 }
1223         } else {
1224                 if (len1) {
1225                         if (copy_from_user(tbuf, bulk.data, len1)) {
1226                                 ret = -EFAULT;
1227                                 goto done;
1228                         }
1229                 }
1230                 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1231
1232                 usb_unlock_device(dev);
1233                 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1234                 usb_lock_device(dev);
1235                 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1236         }
1237         ret = (i < 0 ? i : len2);
1238  done:
1239         kfree(tbuf);
1240         usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1241         return ret;
1242 }
1243
1244 static void check_reset_of_active_ep(struct usb_device *udev,
1245                 unsigned int epnum, char *ioctl_name)
1246 {
1247         struct usb_host_endpoint **eps;
1248         struct usb_host_endpoint *ep;
1249
1250         eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1251         ep = eps[epnum & 0x0f];
1252         if (ep && !list_empty(&ep->urb_list))
1253                 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1254                                 task_pid_nr(current), current->comm,
1255                                 ioctl_name, epnum);
1256 }
1257
1258 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1259 {
1260         unsigned int ep;
1261         int ret;
1262
1263         if (get_user(ep, (unsigned int __user *)arg))
1264                 return -EFAULT;
1265         ret = findintfep(ps->dev, ep);
1266         if (ret < 0)
1267                 return ret;
1268         ret = checkintf(ps, ret);
1269         if (ret)
1270                 return ret;
1271         check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1272         usb_reset_endpoint(ps->dev, ep);
1273         return 0;
1274 }
1275
1276 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1277 {
1278         unsigned int ep;
1279         int pipe;
1280         int ret;
1281
1282         if (get_user(ep, (unsigned int __user *)arg))
1283                 return -EFAULT;
1284         ret = findintfep(ps->dev, ep);
1285         if (ret < 0)
1286                 return ret;
1287         ret = checkintf(ps, ret);
1288         if (ret)
1289                 return ret;
1290         check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1291         if (ep & USB_DIR_IN)
1292                 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1293         else
1294                 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1295
1296         return usb_clear_halt(ps->dev, pipe);
1297 }
1298
1299 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1300 {
1301         struct usbdevfs_getdriver gd;
1302         struct usb_interface *intf;
1303         int ret;
1304
1305         if (copy_from_user(&gd, arg, sizeof(gd)))
1306                 return -EFAULT;
1307         intf = usb_ifnum_to_if(ps->dev, gd.interface);
1308         if (!intf || !intf->dev.driver)
1309                 ret = -ENODATA;
1310         else {
1311                 strlcpy(gd.driver, intf->dev.driver->name,
1312                                 sizeof(gd.driver));
1313                 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1314         }
1315         return ret;
1316 }
1317
1318 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1319 {
1320         struct usbdevfs_connectinfo ci;
1321
1322         memset(&ci, 0, sizeof(ci));
1323         ci.devnum = ps->dev->devnum;
1324         ci.slow = ps->dev->speed == USB_SPEED_LOW;
1325
1326         if (copy_to_user(arg, &ci, sizeof(ci)))
1327                 return -EFAULT;
1328         return 0;
1329 }
1330
1331 static int proc_conninfo_ex(struct usb_dev_state *ps,
1332                             void __user *arg, size_t size)
1333 {
1334         struct usbdevfs_conninfo_ex ci;
1335         struct usb_device *udev = ps->dev;
1336
1337         if (size < sizeof(ci.size))
1338                 return -EINVAL;
1339
1340         memset(&ci, 0, sizeof(ci));
1341         ci.size = sizeof(ci);
1342         ci.busnum = udev->bus->busnum;
1343         ci.devnum = udev->devnum;
1344         ci.speed = udev->speed;
1345
1346         while (udev && udev->portnum != 0) {
1347                 if (++ci.num_ports <= ARRAY_SIZE(ci.ports))
1348                         ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports] =
1349                                         udev->portnum;
1350                 udev = udev->parent;
1351         }
1352
1353         if (ci.num_ports < ARRAY_SIZE(ci.ports))
1354                 memmove(&ci.ports[0],
1355                         &ci.ports[ARRAY_SIZE(ci.ports) - ci.num_ports],
1356                         ci.num_ports);
1357
1358         if (copy_to_user(arg, &ci, min(sizeof(ci), size)))
1359                 return -EFAULT;
1360
1361         return 0;
1362 }
1363
1364 static int proc_resetdevice(struct usb_dev_state *ps)
1365 {
1366         struct usb_host_config *actconfig = ps->dev->actconfig;
1367         struct usb_interface *interface;
1368         int i, number;
1369
1370         /* Don't allow a device reset if the process has dropped the
1371          * privilege to do such things and any of the interfaces are
1372          * currently claimed.
1373          */
1374         if (ps->privileges_dropped && actconfig) {
1375                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1376                         interface = actconfig->interface[i];
1377                         number = interface->cur_altsetting->desc.bInterfaceNumber;
1378                         if (usb_interface_claimed(interface) &&
1379                                         !test_bit(number, &ps->ifclaimed)) {
1380                                 dev_warn(&ps->dev->dev,
1381                                         "usbfs: interface %d claimed by %s while '%s' resets device\n",
1382                                         number, interface->dev.driver->name, current->comm);
1383                                 return -EACCES;
1384                         }
1385                 }
1386         }
1387
1388         return usb_reset_device(ps->dev);
1389 }
1390
1391 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1392 {
1393         struct usbdevfs_setinterface setintf;
1394         int ret;
1395
1396         if (copy_from_user(&setintf, arg, sizeof(setintf)))
1397                 return -EFAULT;
1398         ret = checkintf(ps, setintf.interface);
1399         if (ret)
1400                 return ret;
1401
1402         destroy_async_on_interface(ps, setintf.interface);
1403
1404         return usb_set_interface(ps->dev, setintf.interface,
1405                         setintf.altsetting);
1406 }
1407
1408 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1409 {
1410         int u;
1411         int status = 0;
1412         struct usb_host_config *actconfig;
1413
1414         if (get_user(u, (int __user *)arg))
1415                 return -EFAULT;
1416
1417         actconfig = ps->dev->actconfig;
1418
1419         /* Don't touch the device if any interfaces are claimed.
1420          * It could interfere with other drivers' operations, and if
1421          * an interface is claimed by usbfs it could easily deadlock.
1422          */
1423         if (actconfig) {
1424                 int i;
1425
1426                 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1427                         if (usb_interface_claimed(actconfig->interface[i])) {
1428                                 dev_warn(&ps->dev->dev,
1429                                         "usbfs: interface %d claimed by %s "
1430                                         "while '%s' sets config #%d\n",
1431                                         actconfig->interface[i]
1432                                                 ->cur_altsetting
1433                                                 ->desc.bInterfaceNumber,
1434                                         actconfig->interface[i]
1435                                                 ->dev.driver->name,
1436                                         current->comm, u);
1437                                 status = -EBUSY;
1438                                 break;
1439                         }
1440                 }
1441         }
1442
1443         /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1444          * so avoid usb_set_configuration()'s kick to sysfs
1445          */
1446         if (status == 0) {
1447                 if (actconfig && actconfig->desc.bConfigurationValue == u)
1448                         status = usb_reset_configuration(ps->dev);
1449                 else
1450                         status = usb_set_configuration(ps->dev, u);
1451         }
1452
1453         return status;
1454 }
1455
1456 static struct usb_memory *
1457 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1458 {
1459         struct usb_memory *usbm = NULL, *iter;
1460         unsigned long flags;
1461         unsigned long uurb_start = (unsigned long)uurb->buffer;
1462
1463         spin_lock_irqsave(&ps->lock, flags);
1464         list_for_each_entry(iter, &ps->memory_list, memlist) {
1465                 if (uurb_start >= iter->vm_start &&
1466                                 uurb_start < iter->vm_start + iter->size) {
1467                         if (uurb->buffer_length > iter->vm_start + iter->size -
1468                                         uurb_start) {
1469                                 usbm = ERR_PTR(-EINVAL);
1470                         } else {
1471                                 usbm = iter;
1472                                 usbm->urb_use_count++;
1473                         }
1474                         break;
1475                 }
1476         }
1477         spin_unlock_irqrestore(&ps->lock, flags);
1478         return usbm;
1479 }
1480
1481 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1482                         struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1483                         void __user *arg, sigval_t userurb_sigval)
1484 {
1485         struct usbdevfs_iso_packet_desc *isopkt = NULL;
1486         struct usb_host_endpoint *ep;
1487         struct async *as = NULL;
1488         struct usb_ctrlrequest *dr = NULL;
1489         unsigned int u, totlen, isofrmlen;
1490         int i, ret, num_sgs = 0, ifnum = -1;
1491         int number_of_packets = 0;
1492         unsigned int stream_id = 0;
1493         void *buf;
1494         bool is_in;
1495         bool allow_short = false;
1496         bool allow_zero = false;
1497         unsigned long mask =    USBDEVFS_URB_SHORT_NOT_OK |
1498                                 USBDEVFS_URB_BULK_CONTINUATION |
1499                                 USBDEVFS_URB_NO_FSBR |
1500                                 USBDEVFS_URB_ZERO_PACKET |
1501                                 USBDEVFS_URB_NO_INTERRUPT;
1502         /* USBDEVFS_URB_ISO_ASAP is a special case */
1503         if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1504                 mask |= USBDEVFS_URB_ISO_ASAP;
1505
1506         if (uurb->flags & ~mask)
1507                         return -EINVAL;
1508
1509         if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1510                 return -EINVAL;
1511         if (uurb->buffer_length > 0 && !uurb->buffer)
1512                 return -EINVAL;
1513         if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1514             (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1515                 ifnum = findintfep(ps->dev, uurb->endpoint);
1516                 if (ifnum < 0)
1517                         return ifnum;
1518                 ret = checkintf(ps, ifnum);
1519                 if (ret)
1520                         return ret;
1521         }
1522         ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1523         if (!ep)
1524                 return -ENOENT;
1525         is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1526
1527         u = 0;
1528         switch (uurb->type) {
1529         case USBDEVFS_URB_TYPE_CONTROL:
1530                 if (!usb_endpoint_xfer_control(&ep->desc))
1531                         return -EINVAL;
1532                 /* min 8 byte setup packet */
1533                 if (uurb->buffer_length < 8)
1534                         return -EINVAL;
1535                 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1536                 if (!dr)
1537                         return -ENOMEM;
1538                 if (copy_from_user(dr, uurb->buffer, 8)) {
1539                         ret = -EFAULT;
1540                         goto error;
1541                 }
1542                 if (uurb->buffer_length < (le16_to_cpu(dr->wLength) + 8)) {
1543                         ret = -EINVAL;
1544                         goto error;
1545                 }
1546                 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1547                                       le16_to_cpu(dr->wIndex));
1548                 if (ret)
1549                         goto error;
1550                 uurb->buffer_length = le16_to_cpu(dr->wLength);
1551                 uurb->buffer += 8;
1552                 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1553                         is_in = 1;
1554                         uurb->endpoint |= USB_DIR_IN;
1555                 } else {
1556                         is_in = 0;
1557                         uurb->endpoint &= ~USB_DIR_IN;
1558                 }
1559                 if (is_in)
1560                         allow_short = true;
1561                 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1562                         "bRequest=%02x wValue=%04x "
1563                         "wIndex=%04x wLength=%04x\n",
1564                         dr->bRequestType, dr->bRequest,
1565                         __le16_to_cpu(dr->wValue),
1566                         __le16_to_cpu(dr->wIndex),
1567                         __le16_to_cpu(dr->wLength));
1568                 u = sizeof(struct usb_ctrlrequest);
1569                 break;
1570
1571         case USBDEVFS_URB_TYPE_BULK:
1572                 if (!is_in)
1573                         allow_zero = true;
1574                 else
1575                         allow_short = true;
1576                 switch (usb_endpoint_type(&ep->desc)) {
1577                 case USB_ENDPOINT_XFER_CONTROL:
1578                 case USB_ENDPOINT_XFER_ISOC:
1579                         return -EINVAL;
1580                 case USB_ENDPOINT_XFER_INT:
1581                         /* allow single-shot interrupt transfers */
1582                         uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1583                         goto interrupt_urb;
1584                 }
1585                 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1586                 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1587                         num_sgs = 0;
1588                 if (ep->streams)
1589                         stream_id = uurb->stream_id;
1590                 break;
1591
1592         case USBDEVFS_URB_TYPE_INTERRUPT:
1593                 if (!usb_endpoint_xfer_int(&ep->desc))
1594                         return -EINVAL;
1595  interrupt_urb:
1596                 if (!is_in)
1597                         allow_zero = true;
1598                 else
1599                         allow_short = true;
1600                 break;
1601
1602         case USBDEVFS_URB_TYPE_ISO:
1603                 /* arbitrary limit */
1604                 if (uurb->number_of_packets < 1 ||
1605                     uurb->number_of_packets > 128)
1606                         return -EINVAL;
1607                 if (!usb_endpoint_xfer_isoc(&ep->desc))
1608                         return -EINVAL;
1609                 number_of_packets = uurb->number_of_packets;
1610                 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1611                                    number_of_packets;
1612                 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1613                 if (IS_ERR(isopkt)) {
1614                         ret = PTR_ERR(isopkt);
1615                         isopkt = NULL;
1616                         goto error;
1617                 }
1618                 for (totlen = u = 0; u < number_of_packets; u++) {
1619                         /*
1620                          * arbitrary limit need for USB 3.1 Gen2
1621                          * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1622                          */
1623                         if (isopkt[u].length > 98304) {
1624                                 ret = -EINVAL;
1625                                 goto error;
1626                         }
1627                         totlen += isopkt[u].length;
1628                 }
1629                 u *= sizeof(struct usb_iso_packet_descriptor);
1630                 uurb->buffer_length = totlen;
1631                 break;
1632
1633         default:
1634                 return -EINVAL;
1635         }
1636
1637         if (uurb->buffer_length > 0 &&
1638                         !access_ok(uurb->buffer, uurb->buffer_length)) {
1639                 ret = -EFAULT;
1640                 goto error;
1641         }
1642         as = alloc_async(number_of_packets);
1643         if (!as) {
1644                 ret = -ENOMEM;
1645                 goto error;
1646         }
1647
1648         as->usbm = find_memory_area(ps, uurb);
1649         if (IS_ERR(as->usbm)) {
1650                 ret = PTR_ERR(as->usbm);
1651                 as->usbm = NULL;
1652                 goto error;
1653         }
1654
1655         /* do not use SG buffers when memory mapped segments
1656          * are in use
1657          */
1658         if (as->usbm)
1659                 num_sgs = 0;
1660
1661         u += sizeof(struct async) + sizeof(struct urb) +
1662              (as->usbm ? 0 : uurb->buffer_length) +
1663              num_sgs * sizeof(struct scatterlist);
1664         ret = usbfs_increase_memory_usage(u);
1665         if (ret)
1666                 goto error;
1667         as->mem_usage = u;
1668
1669         if (num_sgs) {
1670                 as->urb->sg = kmalloc_array(num_sgs,
1671                                             sizeof(struct scatterlist),
1672                                             GFP_KERNEL);
1673                 if (!as->urb->sg) {
1674                         ret = -ENOMEM;
1675                         goto error;
1676                 }
1677                 as->urb->num_sgs = num_sgs;
1678                 sg_init_table(as->urb->sg, as->urb->num_sgs);
1679
1680                 totlen = uurb->buffer_length;
1681                 for (i = 0; i < as->urb->num_sgs; i++) {
1682                         u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1683                         buf = kmalloc(u, GFP_KERNEL);
1684                         if (!buf) {
1685                                 ret = -ENOMEM;
1686                                 goto error;
1687                         }
1688                         sg_set_buf(&as->urb->sg[i], buf, u);
1689
1690                         if (!is_in) {
1691                                 if (copy_from_user(buf, uurb->buffer, u)) {
1692                                         ret = -EFAULT;
1693                                         goto error;
1694                                 }
1695                                 uurb->buffer += u;
1696                         }
1697                         totlen -= u;
1698                 }
1699         } else if (uurb->buffer_length > 0) {
1700                 if (as->usbm) {
1701                         unsigned long uurb_start = (unsigned long)uurb->buffer;
1702
1703                         as->urb->transfer_buffer = as->usbm->mem +
1704                                         (uurb_start - as->usbm->vm_start);
1705                 } else {
1706                         as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1707                                         GFP_KERNEL);
1708                         if (!as->urb->transfer_buffer) {
1709                                 ret = -ENOMEM;
1710                                 goto error;
1711                         }
1712                         if (!is_in) {
1713                                 if (copy_from_user(as->urb->transfer_buffer,
1714                                                    uurb->buffer,
1715                                                    uurb->buffer_length)) {
1716                                         ret = -EFAULT;
1717                                         goto error;
1718                                 }
1719                         } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1720                                 /*
1721                                  * Isochronous input data may end up being
1722                                  * discontiguous if some of the packets are
1723                                  * short. Clear the buffer so that the gaps
1724                                  * don't leak kernel data to userspace.
1725                                  */
1726                                 memset(as->urb->transfer_buffer, 0,
1727                                                 uurb->buffer_length);
1728                         }
1729                 }
1730         }
1731         as->urb->dev = ps->dev;
1732         as->urb->pipe = (uurb->type << 30) |
1733                         __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1734                         (uurb->endpoint & USB_DIR_IN);
1735
1736         /* This tedious sequence is necessary because the URB_* flags
1737          * are internal to the kernel and subject to change, whereas
1738          * the USBDEVFS_URB_* flags are a user API and must not be changed.
1739          */
1740         u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1741         if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1742                 u |= URB_ISO_ASAP;
1743         if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1744                 u |= URB_SHORT_NOT_OK;
1745         if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1746                 u |= URB_ZERO_PACKET;
1747         if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1748                 u |= URB_NO_INTERRUPT;
1749         as->urb->transfer_flags = u;
1750
1751         if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1752                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1753         if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1754                 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1755
1756         as->urb->transfer_buffer_length = uurb->buffer_length;
1757         as->urb->setup_packet = (unsigned char *)dr;
1758         dr = NULL;
1759         as->urb->start_frame = uurb->start_frame;
1760         as->urb->number_of_packets = number_of_packets;
1761         as->urb->stream_id = stream_id;
1762
1763         if (ep->desc.bInterval) {
1764                 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1765                                 ps->dev->speed == USB_SPEED_HIGH ||
1766                                 ps->dev->speed >= USB_SPEED_SUPER)
1767                         as->urb->interval = 1 <<
1768                                         min(15, ep->desc.bInterval - 1);
1769                 else
1770                         as->urb->interval = ep->desc.bInterval;
1771         }
1772
1773         as->urb->context = as;
1774         as->urb->complete = async_completed;
1775         for (totlen = u = 0; u < number_of_packets; u++) {
1776                 as->urb->iso_frame_desc[u].offset = totlen;
1777                 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1778                 totlen += isopkt[u].length;
1779         }
1780         kfree(isopkt);
1781         isopkt = NULL;
1782         as->ps = ps;
1783         as->userurb = arg;
1784         as->userurb_sigval = userurb_sigval;
1785         if (as->usbm) {
1786                 unsigned long uurb_start = (unsigned long)uurb->buffer;
1787
1788                 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1789                 as->urb->transfer_dma = as->usbm->dma_handle +
1790                                 (uurb_start - as->usbm->vm_start);
1791         } else if (is_in && uurb->buffer_length > 0)
1792                 as->userbuffer = uurb->buffer;
1793         as->signr = uurb->signr;
1794         as->ifnum = ifnum;
1795         as->pid = get_pid(task_pid(current));
1796         as->cred = get_current_cred();
1797         snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1798                         as->urb->transfer_buffer_length, 0, SUBMIT,
1799                         NULL, 0);
1800         if (!is_in)
1801                 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1802
1803         async_newpending(as);
1804
1805         if (usb_endpoint_xfer_bulk(&ep->desc)) {
1806                 spin_lock_irq(&ps->lock);
1807
1808                 /* Not exactly the endpoint address; the direction bit is
1809                  * shifted to the 0x10 position so that the value will be
1810                  * between 0 and 31.
1811                  */
1812                 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1813                         ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1814                                 >> 3);
1815
1816                 /* If this bulk URB is the start of a new transfer, re-enable
1817                  * the endpoint.  Otherwise mark it as a continuation URB.
1818                  */
1819                 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1820                         as->bulk_status = AS_CONTINUATION;
1821                 else
1822                         ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1823
1824                 /* Don't accept continuation URBs if the endpoint is
1825                  * disabled because of an earlier error.
1826                  */
1827                 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1828                         ret = -EREMOTEIO;
1829                 else
1830                         ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1831                 spin_unlock_irq(&ps->lock);
1832         } else {
1833                 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1834         }
1835
1836         if (ret) {
1837                 dev_printk(KERN_DEBUG, &ps->dev->dev,
1838                            "usbfs: usb_submit_urb returned %d\n", ret);
1839                 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1840                                 0, ret, COMPLETE, NULL, 0);
1841                 async_removepending(as);
1842                 goto error;
1843         }
1844         return 0;
1845
1846  error:
1847         kfree(isopkt);
1848         kfree(dr);
1849         if (as)
1850                 free_async(as);
1851         return ret;
1852 }
1853
1854 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1855 {
1856         struct usbdevfs_urb uurb;
1857         sigval_t userurb_sigval;
1858
1859         if (copy_from_user(&uurb, arg, sizeof(uurb)))
1860                 return -EFAULT;
1861
1862         memset(&userurb_sigval, 0, sizeof(userurb_sigval));
1863         userurb_sigval.sival_ptr = arg;
1864
1865         return proc_do_submiturb(ps, &uurb,
1866                         (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1867                         arg, userurb_sigval);
1868 }
1869
1870 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1871 {
1872         struct urb *urb;
1873         struct async *as;
1874         unsigned long flags;
1875
1876         spin_lock_irqsave(&ps->lock, flags);
1877         as = async_getpending(ps, arg);
1878         if (!as) {
1879                 spin_unlock_irqrestore(&ps->lock, flags);
1880                 return -EINVAL;
1881         }
1882
1883         urb = as->urb;
1884         usb_get_urb(urb);
1885         spin_unlock_irqrestore(&ps->lock, flags);
1886
1887         usb_kill_urb(urb);
1888         usb_put_urb(urb);
1889
1890         return 0;
1891 }
1892
1893 static void compute_isochronous_actual_length(struct urb *urb)
1894 {
1895         unsigned int i;
1896
1897         if (urb->number_of_packets > 0) {
1898                 urb->actual_length = 0;
1899                 for (i = 0; i < urb->number_of_packets; i++)
1900                         urb->actual_length +=
1901                                         urb->iso_frame_desc[i].actual_length;
1902         }
1903 }
1904
1905 static int processcompl(struct async *as, void __user * __user *arg)
1906 {
1907         struct urb *urb = as->urb;
1908         struct usbdevfs_urb __user *userurb = as->userurb;
1909         void __user *addr = as->userurb;
1910         unsigned int i;
1911
1912         compute_isochronous_actual_length(urb);
1913         if (as->userbuffer && urb->actual_length) {
1914                 if (copy_urb_data_to_user(as->userbuffer, urb))
1915                         goto err_out;
1916         }
1917         if (put_user(as->status, &userurb->status))
1918                 goto err_out;
1919         if (put_user(urb->actual_length, &userurb->actual_length))
1920                 goto err_out;
1921         if (put_user(urb->error_count, &userurb->error_count))
1922                 goto err_out;
1923
1924         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1925                 for (i = 0; i < urb->number_of_packets; i++) {
1926                         if (put_user(urb->iso_frame_desc[i].actual_length,
1927                                      &userurb->iso_frame_desc[i].actual_length))
1928                                 goto err_out;
1929                         if (put_user(urb->iso_frame_desc[i].status,
1930                                      &userurb->iso_frame_desc[i].status))
1931                                 goto err_out;
1932                 }
1933         }
1934
1935         if (put_user(addr, (void __user * __user *)arg))
1936                 return -EFAULT;
1937         return 0;
1938
1939 err_out:
1940         return -EFAULT;
1941 }
1942
1943 static struct async *reap_as(struct usb_dev_state *ps)
1944 {
1945         DECLARE_WAITQUEUE(wait, current);
1946         struct async *as = NULL;
1947         struct usb_device *dev = ps->dev;
1948
1949         add_wait_queue(&ps->wait, &wait);
1950         for (;;) {
1951                 __set_current_state(TASK_INTERRUPTIBLE);
1952                 as = async_getcompleted(ps);
1953                 if (as || !connected(ps))
1954                         break;
1955                 if (signal_pending(current))
1956                         break;
1957                 usb_unlock_device(dev);
1958                 schedule();
1959                 usb_lock_device(dev);
1960         }
1961         remove_wait_queue(&ps->wait, &wait);
1962         set_current_state(TASK_RUNNING);
1963         return as;
1964 }
1965
1966 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1967 {
1968         struct async *as = reap_as(ps);
1969
1970         if (as) {
1971                 int retval;
1972
1973                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1974                 retval = processcompl(as, (void __user * __user *)arg);
1975                 free_async(as);
1976                 return retval;
1977         }
1978         if (signal_pending(current))
1979                 return -EINTR;
1980         return -ENODEV;
1981 }
1982
1983 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1984 {
1985         int retval;
1986         struct async *as;
1987
1988         as = async_getcompleted(ps);
1989         if (as) {
1990                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1991                 retval = processcompl(as, (void __user * __user *)arg);
1992                 free_async(as);
1993         } else {
1994                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1995         }
1996         return retval;
1997 }
1998
1999 #ifdef CONFIG_COMPAT
2000 static int proc_control_compat(struct usb_dev_state *ps,
2001                                 struct usbdevfs_ctrltransfer32 __user *p32)
2002 {
2003         struct usbdevfs_ctrltransfer __user *p;
2004         __u32 udata;
2005         p = compat_alloc_user_space(sizeof(*p));
2006         if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
2007             get_user(udata, &p32->data) ||
2008             put_user(compat_ptr(udata), &p->data))
2009                 return -EFAULT;
2010         return proc_control(ps, p);
2011 }
2012
2013 static int proc_bulk_compat(struct usb_dev_state *ps,
2014                         struct usbdevfs_bulktransfer32 __user *p32)
2015 {
2016         struct usbdevfs_bulktransfer __user *p;
2017         compat_uint_t n;
2018         compat_caddr_t addr;
2019
2020         p = compat_alloc_user_space(sizeof(*p));
2021
2022         if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
2023             get_user(n, &p32->len) || put_user(n, &p->len) ||
2024             get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
2025             get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
2026                 return -EFAULT;
2027
2028         return proc_bulk(ps, p);
2029 }
2030 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
2031 {
2032         struct usbdevfs_disconnectsignal32 ds;
2033
2034         if (copy_from_user(&ds, arg, sizeof(ds)))
2035                 return -EFAULT;
2036         ps->discsignr = ds.signr;
2037         ps->disccontext.sival_int = ds.context;
2038         return 0;
2039 }
2040
2041 static int get_urb32(struct usbdevfs_urb *kurb,
2042                      struct usbdevfs_urb32 __user *uurb)
2043 {
2044         struct usbdevfs_urb32 urb32;
2045         if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
2046                 return -EFAULT;
2047         kurb->type = urb32.type;
2048         kurb->endpoint = urb32.endpoint;
2049         kurb->status = urb32.status;
2050         kurb->flags = urb32.flags;
2051         kurb->buffer = compat_ptr(urb32.buffer);
2052         kurb->buffer_length = urb32.buffer_length;
2053         kurb->actual_length = urb32.actual_length;
2054         kurb->start_frame = urb32.start_frame;
2055         kurb->number_of_packets = urb32.number_of_packets;
2056         kurb->error_count = urb32.error_count;
2057         kurb->signr = urb32.signr;
2058         kurb->usercontext = compat_ptr(urb32.usercontext);
2059         return 0;
2060 }
2061
2062 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2063 {
2064         struct usbdevfs_urb uurb;
2065         sigval_t userurb_sigval;
2066
2067         if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2068                 return -EFAULT;
2069
2070         memset(&userurb_sigval, 0, sizeof(userurb_sigval));
2071         userurb_sigval.sival_int = ptr_to_compat(arg);
2072
2073         return proc_do_submiturb(ps, &uurb,
2074                         ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2075                         arg, userurb_sigval);
2076 }
2077
2078 static int processcompl_compat(struct async *as, void __user * __user *arg)
2079 {
2080         struct urb *urb = as->urb;
2081         struct usbdevfs_urb32 __user *userurb = as->userurb;
2082         void __user *addr = as->userurb;
2083         unsigned int i;
2084
2085         compute_isochronous_actual_length(urb);
2086         if (as->userbuffer && urb->actual_length) {
2087                 if (copy_urb_data_to_user(as->userbuffer, urb))
2088                         return -EFAULT;
2089         }
2090         if (put_user(as->status, &userurb->status))
2091                 return -EFAULT;
2092         if (put_user(urb->actual_length, &userurb->actual_length))
2093                 return -EFAULT;
2094         if (put_user(urb->error_count, &userurb->error_count))
2095                 return -EFAULT;
2096
2097         if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2098                 for (i = 0; i < urb->number_of_packets; i++) {
2099                         if (put_user(urb->iso_frame_desc[i].actual_length,
2100                                      &userurb->iso_frame_desc[i].actual_length))
2101                                 return -EFAULT;
2102                         if (put_user(urb->iso_frame_desc[i].status,
2103                                      &userurb->iso_frame_desc[i].status))
2104                                 return -EFAULT;
2105                 }
2106         }
2107
2108         if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2109                 return -EFAULT;
2110         return 0;
2111 }
2112
2113 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2114 {
2115         struct async *as = reap_as(ps);
2116
2117         if (as) {
2118                 int retval;
2119
2120                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2121                 retval = processcompl_compat(as, (void __user * __user *)arg);
2122                 free_async(as);
2123                 return retval;
2124         }
2125         if (signal_pending(current))
2126                 return -EINTR;
2127         return -ENODEV;
2128 }
2129
2130 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2131 {
2132         int retval;
2133         struct async *as;
2134
2135         as = async_getcompleted(ps);
2136         if (as) {
2137                 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2138                 retval = processcompl_compat(as, (void __user * __user *)arg);
2139                 free_async(as);
2140         } else {
2141                 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2142         }
2143         return retval;
2144 }
2145
2146
2147 #endif
2148
2149 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2150 {
2151         struct usbdevfs_disconnectsignal ds;
2152
2153         if (copy_from_user(&ds, arg, sizeof(ds)))
2154                 return -EFAULT;
2155         ps->discsignr = ds.signr;
2156         ps->disccontext.sival_ptr = ds.context;
2157         return 0;
2158 }
2159
2160 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2161 {
2162         unsigned int ifnum;
2163
2164         if (get_user(ifnum, (unsigned int __user *)arg))
2165                 return -EFAULT;
2166         return claimintf(ps, ifnum);
2167 }
2168
2169 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2170 {
2171         unsigned int ifnum;
2172         int ret;
2173
2174         if (get_user(ifnum, (unsigned int __user *)arg))
2175                 return -EFAULT;
2176         ret = releaseintf(ps, ifnum);
2177         if (ret < 0)
2178                 return ret;
2179         destroy_async_on_interface(ps, ifnum);
2180         return 0;
2181 }
2182
2183 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2184 {
2185         int                     size;
2186         void                    *buf = NULL;
2187         int                     retval = 0;
2188         struct usb_interface    *intf = NULL;
2189         struct usb_driver       *driver = NULL;
2190
2191         if (ps->privileges_dropped)
2192                 return -EACCES;
2193
2194         if (!connected(ps))
2195                 return -ENODEV;
2196
2197         /* alloc buffer */
2198         size = _IOC_SIZE(ctl->ioctl_code);
2199         if (size > 0) {
2200                 buf = kmalloc(size, GFP_KERNEL);
2201                 if (buf == NULL)
2202                         return -ENOMEM;
2203                 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2204                         if (copy_from_user(buf, ctl->data, size)) {
2205                                 kfree(buf);
2206                                 return -EFAULT;
2207                         }
2208                 } else {
2209                         memset(buf, 0, size);
2210                 }
2211         }
2212
2213         if (ps->dev->state != USB_STATE_CONFIGURED)
2214                 retval = -EHOSTUNREACH;
2215         else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2216                 retval = -EINVAL;
2217         else switch (ctl->ioctl_code) {
2218
2219         /* disconnect kernel driver from interface */
2220         case USBDEVFS_DISCONNECT:
2221                 if (intf->dev.driver) {
2222                         driver = to_usb_driver(intf->dev.driver);
2223                         dev_dbg(&intf->dev, "disconnect by usbfs\n");
2224                         usb_driver_release_interface(driver, intf);
2225                 } else
2226                         retval = -ENODATA;
2227                 break;
2228
2229         /* let kernel drivers try to (re)bind to the interface */
2230         case USBDEVFS_CONNECT:
2231                 if (!intf->dev.driver)
2232                         retval = device_attach(&intf->dev);
2233                 else
2234                         retval = -EBUSY;
2235                 break;
2236
2237         /* talk directly to the interface's driver */
2238         default:
2239                 if (intf->dev.driver)
2240                         driver = to_usb_driver(intf->dev.driver);
2241                 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2242                         retval = -ENOTTY;
2243                 } else {
2244                         retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2245                         if (retval == -ENOIOCTLCMD)
2246                                 retval = -ENOTTY;
2247                 }
2248         }
2249
2250         /* cleanup and return */
2251         if (retval >= 0
2252                         && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2253                         && size > 0
2254                         && copy_to_user(ctl->data, buf, size) != 0)
2255                 retval = -EFAULT;
2256
2257         kfree(buf);
2258         return retval;
2259 }
2260
2261 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2262 {
2263         struct usbdevfs_ioctl   ctrl;
2264
2265         if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2266                 return -EFAULT;
2267         return proc_ioctl(ps, &ctrl);
2268 }
2269
2270 #ifdef CONFIG_COMPAT
2271 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2272 {
2273         struct usbdevfs_ioctl32 ioc32;
2274         struct usbdevfs_ioctl ctrl;
2275
2276         if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2277                 return -EFAULT;
2278         ctrl.ifno = ioc32.ifno;
2279         ctrl.ioctl_code = ioc32.ioctl_code;
2280         ctrl.data = compat_ptr(ioc32.data);
2281         return proc_ioctl(ps, &ctrl);
2282 }
2283 #endif
2284
2285 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2286 {
2287         unsigned portnum;
2288         int rc;
2289
2290         if (get_user(portnum, (unsigned __user *) arg))
2291                 return -EFAULT;
2292         rc = usb_hub_claim_port(ps->dev, portnum, ps);
2293         if (rc == 0)
2294                 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2295                         portnum, task_pid_nr(current), current->comm);
2296         return rc;
2297 }
2298
2299 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2300 {
2301         unsigned portnum;
2302
2303         if (get_user(portnum, (unsigned __user *) arg))
2304                 return -EFAULT;
2305         return usb_hub_release_port(ps->dev, portnum, ps);
2306 }
2307
2308 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2309 {
2310         __u32 caps;
2311
2312         caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2313                         USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2314                         USBDEVFS_CAP_DROP_PRIVILEGES |
2315                         USBDEVFS_CAP_CONNINFO_EX | MAYBE_CAP_SUSPEND;
2316         if (!ps->dev->bus->no_stop_on_short)
2317                 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2318         if (ps->dev->bus->sg_tablesize)
2319                 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2320
2321         if (put_user(caps, (__u32 __user *)arg))
2322                 return -EFAULT;
2323
2324         return 0;
2325 }
2326
2327 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2328 {
2329         struct usbdevfs_disconnect_claim dc;
2330         struct usb_interface *intf;
2331
2332         if (copy_from_user(&dc, arg, sizeof(dc)))
2333                 return -EFAULT;
2334
2335         intf = usb_ifnum_to_if(ps->dev, dc.interface);
2336         if (!intf)
2337                 return -EINVAL;
2338
2339         if (intf->dev.driver) {
2340                 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2341
2342                 if (ps->privileges_dropped)
2343                         return -EACCES;
2344
2345                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2346                                 strncmp(dc.driver, intf->dev.driver->name,
2347                                         sizeof(dc.driver)) != 0)
2348                         return -EBUSY;
2349
2350                 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2351                                 strncmp(dc.driver, intf->dev.driver->name,
2352                                         sizeof(dc.driver)) == 0)
2353                         return -EBUSY;
2354
2355                 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2356                 usb_driver_release_interface(driver, intf);
2357         }
2358
2359         return claimintf(ps, dc.interface);
2360 }
2361
2362 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2363 {
2364         unsigned num_streams, num_eps;
2365         struct usb_host_endpoint **eps;
2366         struct usb_interface *intf;
2367         int r;
2368
2369         r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2370                                    &eps, &intf);
2371         if (r)
2372                 return r;
2373
2374         destroy_async_on_interface(ps,
2375                                    intf->altsetting[0].desc.bInterfaceNumber);
2376
2377         r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2378         kfree(eps);
2379         return r;
2380 }
2381
2382 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2383 {
2384         unsigned num_eps;
2385         struct usb_host_endpoint **eps;
2386         struct usb_interface *intf;
2387         int r;
2388
2389         r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2390         if (r)
2391                 return r;
2392
2393         destroy_async_on_interface(ps,
2394                                    intf->altsetting[0].desc.bInterfaceNumber);
2395
2396         r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2397         kfree(eps);
2398         return r;
2399 }
2400
2401 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2402 {
2403         u32 data;
2404
2405         if (copy_from_user(&data, arg, sizeof(data)))
2406                 return -EFAULT;
2407
2408         /* This is a one way operation. Once privileges are
2409          * dropped, you cannot regain them. You may however reissue
2410          * this ioctl to shrink the allowed interfaces mask.
2411          */
2412         ps->interface_allowed_mask &= data;
2413         ps->privileges_dropped = true;
2414
2415         return 0;
2416 }
2417
2418 static int proc_forbid_suspend(struct usb_dev_state *ps)
2419 {
2420         int ret = 0;
2421
2422         if (ps->suspend_allowed) {
2423                 ret = usb_autoresume_device(ps->dev);
2424                 if (ret == 0)
2425                         ps->suspend_allowed = false;
2426                 else if (ret != -ENODEV)
2427                         ret = -EIO;
2428         }
2429         return ret;
2430 }
2431
2432 static int proc_allow_suspend(struct usb_dev_state *ps)
2433 {
2434         if (!connected(ps))
2435                 return -ENODEV;
2436
2437         WRITE_ONCE(ps->not_yet_resumed, 1);
2438         if (!ps->suspend_allowed) {
2439                 usb_autosuspend_device(ps->dev);
2440                 ps->suspend_allowed = true;
2441         }
2442         return 0;
2443 }
2444
2445 static int proc_wait_for_resume(struct usb_dev_state *ps)
2446 {
2447         int ret;
2448
2449         usb_unlock_device(ps->dev);
2450         ret = wait_event_interruptible(ps->wait_for_resume,
2451                         READ_ONCE(ps->not_yet_resumed) == 0);
2452         usb_lock_device(ps->dev);
2453
2454         if (ret != 0)
2455                 return -EINTR;
2456         return proc_forbid_suspend(ps);
2457 }
2458
2459 /*
2460  * NOTE:  All requests here that have interface numbers as parameters
2461  * are assuming that somehow the configuration has been prevented from
2462  * changing.  But there's no mechanism to ensure that...
2463  */
2464 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2465                                 void __user *p)
2466 {
2467         struct usb_dev_state *ps = file->private_data;
2468         struct inode *inode = file_inode(file);
2469         struct usb_device *dev = ps->dev;
2470         int ret = -ENOTTY;
2471
2472         if (!(file->f_mode & FMODE_WRITE))
2473                 return -EPERM;
2474
2475         usb_lock_device(dev);
2476
2477         /* Reap operations are allowed even after disconnection */
2478         switch (cmd) {
2479         case USBDEVFS_REAPURB:
2480                 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2481                 ret = proc_reapurb(ps, p);
2482                 goto done;
2483
2484         case USBDEVFS_REAPURBNDELAY:
2485                 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2486                 ret = proc_reapurbnonblock(ps, p);
2487                 goto done;
2488
2489 #ifdef CONFIG_COMPAT
2490         case USBDEVFS_REAPURB32:
2491                 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2492                 ret = proc_reapurb_compat(ps, p);
2493                 goto done;
2494
2495         case USBDEVFS_REAPURBNDELAY32:
2496                 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2497                 ret = proc_reapurbnonblock_compat(ps, p);
2498                 goto done;
2499 #endif
2500         }
2501
2502         if (!connected(ps)) {
2503                 usb_unlock_device(dev);
2504                 return -ENODEV;
2505         }
2506
2507         switch (cmd) {
2508         case USBDEVFS_CONTROL:
2509                 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2510                 ret = proc_control(ps, p);
2511                 if (ret >= 0)
2512                         inode->i_mtime = current_time(inode);
2513                 break;
2514
2515         case USBDEVFS_BULK:
2516                 snoop(&dev->dev, "%s: BULK\n", __func__);
2517                 ret = proc_bulk(ps, p);
2518                 if (ret >= 0)
2519                         inode->i_mtime = current_time(inode);
2520                 break;
2521
2522         case USBDEVFS_RESETEP:
2523                 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2524                 ret = proc_resetep(ps, p);
2525                 if (ret >= 0)
2526                         inode->i_mtime = current_time(inode);
2527                 break;
2528
2529         case USBDEVFS_RESET:
2530                 snoop(&dev->dev, "%s: RESET\n", __func__);
2531                 ret = proc_resetdevice(ps);
2532                 break;
2533
2534         case USBDEVFS_CLEAR_HALT:
2535                 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2536                 ret = proc_clearhalt(ps, p);
2537                 if (ret >= 0)
2538                         inode->i_mtime = current_time(inode);
2539                 break;
2540
2541         case USBDEVFS_GETDRIVER:
2542                 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2543                 ret = proc_getdriver(ps, p);
2544                 break;
2545
2546         case USBDEVFS_CONNECTINFO:
2547                 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2548                 ret = proc_connectinfo(ps, p);
2549                 break;
2550
2551         case USBDEVFS_SETINTERFACE:
2552                 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2553                 ret = proc_setintf(ps, p);
2554                 break;
2555
2556         case USBDEVFS_SETCONFIGURATION:
2557                 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2558                 ret = proc_setconfig(ps, p);
2559                 break;
2560
2561         case USBDEVFS_SUBMITURB:
2562                 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2563                 ret = proc_submiturb(ps, p);
2564                 if (ret >= 0)
2565                         inode->i_mtime = current_time(inode);
2566                 break;
2567
2568 #ifdef CONFIG_COMPAT
2569         case USBDEVFS_CONTROL32:
2570                 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2571                 ret = proc_control_compat(ps, p);
2572                 if (ret >= 0)
2573                         inode->i_mtime = current_time(inode);
2574                 break;
2575
2576         case USBDEVFS_BULK32:
2577                 snoop(&dev->dev, "%s: BULK32\n", __func__);
2578                 ret = proc_bulk_compat(ps, p);
2579                 if (ret >= 0)
2580                         inode->i_mtime = current_time(inode);
2581                 break;
2582
2583         case USBDEVFS_DISCSIGNAL32:
2584                 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2585                 ret = proc_disconnectsignal_compat(ps, p);
2586                 break;
2587
2588         case USBDEVFS_SUBMITURB32:
2589                 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2590                 ret = proc_submiturb_compat(ps, p);
2591                 if (ret >= 0)
2592                         inode->i_mtime = current_time(inode);
2593                 break;
2594
2595         case USBDEVFS_IOCTL32:
2596                 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2597                 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2598                 break;
2599 #endif
2600
2601         case USBDEVFS_DISCARDURB:
2602                 snoop(&dev->dev, "%s: DISCARDURB %pK\n", __func__, p);
2603                 ret = proc_unlinkurb(ps, p);
2604                 break;
2605
2606         case USBDEVFS_DISCSIGNAL:
2607                 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2608                 ret = proc_disconnectsignal(ps, p);
2609                 break;
2610
2611         case USBDEVFS_CLAIMINTERFACE:
2612                 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2613                 ret = proc_claiminterface(ps, p);
2614                 break;
2615
2616         case USBDEVFS_RELEASEINTERFACE:
2617                 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2618                 ret = proc_releaseinterface(ps, p);
2619                 break;
2620
2621         case USBDEVFS_IOCTL:
2622                 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2623                 ret = proc_ioctl_default(ps, p);
2624                 break;
2625
2626         case USBDEVFS_CLAIM_PORT:
2627                 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2628                 ret = proc_claim_port(ps, p);
2629                 break;
2630
2631         case USBDEVFS_RELEASE_PORT:
2632                 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2633                 ret = proc_release_port(ps, p);
2634                 break;
2635         case USBDEVFS_GET_CAPABILITIES:
2636                 ret = proc_get_capabilities(ps, p);
2637                 break;
2638         case USBDEVFS_DISCONNECT_CLAIM:
2639                 ret = proc_disconnect_claim(ps, p);
2640                 break;
2641         case USBDEVFS_ALLOC_STREAMS:
2642                 ret = proc_alloc_streams(ps, p);
2643                 break;
2644         case USBDEVFS_FREE_STREAMS:
2645                 ret = proc_free_streams(ps, p);
2646                 break;
2647         case USBDEVFS_DROP_PRIVILEGES:
2648                 ret = proc_drop_privileges(ps, p);
2649                 break;
2650         case USBDEVFS_GET_SPEED:
2651                 ret = ps->dev->speed;
2652                 break;
2653         case USBDEVFS_FORBID_SUSPEND:
2654                 ret = proc_forbid_suspend(ps);
2655                 break;
2656         case USBDEVFS_ALLOW_SUSPEND:
2657                 ret = proc_allow_suspend(ps);
2658                 break;
2659         case USBDEVFS_WAIT_FOR_RESUME:
2660                 ret = proc_wait_for_resume(ps);
2661                 break;
2662         }
2663
2664         /* Handle variable-length commands */
2665         switch (cmd & ~IOCSIZE_MASK) {
2666         case USBDEVFS_CONNINFO_EX(0):
2667                 ret = proc_conninfo_ex(ps, p, _IOC_SIZE(cmd));
2668                 break;
2669         }
2670
2671  done:
2672         usb_unlock_device(dev);
2673         if (ret >= 0)
2674                 inode->i_atime = current_time(inode);
2675         return ret;
2676 }
2677
2678 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2679                         unsigned long arg)
2680 {
2681         int ret;
2682
2683         ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2684
2685         return ret;
2686 }
2687
2688 #ifdef CONFIG_COMPAT
2689 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2690                         unsigned long arg)
2691 {
2692         int ret;
2693
2694         ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2695
2696         return ret;
2697 }
2698 #endif
2699
2700 /* No kernel lock - fine */
2701 static __poll_t usbdev_poll(struct file *file,
2702                                 struct poll_table_struct *wait)
2703 {
2704         struct usb_dev_state *ps = file->private_data;
2705         __poll_t mask = 0;
2706
2707         poll_wait(file, &ps->wait, wait);
2708         if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2709                 mask |= EPOLLOUT | EPOLLWRNORM;
2710         if (!connected(ps))
2711                 mask |= EPOLLHUP;
2712         if (list_empty(&ps->list))
2713                 mask |= EPOLLERR;
2714         return mask;
2715 }
2716
2717 const struct file_operations usbdev_file_operations = {
2718         .owner =          THIS_MODULE,
2719         .llseek =         no_seek_end_llseek,
2720         .read =           usbdev_read,
2721         .poll =           usbdev_poll,
2722         .unlocked_ioctl = usbdev_ioctl,
2723 #ifdef CONFIG_COMPAT
2724         .compat_ioctl =   usbdev_compat_ioctl,
2725 #endif
2726         .mmap =           usbdev_mmap,
2727         .open =           usbdev_open,
2728         .release =        usbdev_release,
2729 };
2730
2731 static void usbdev_remove(struct usb_device *udev)
2732 {
2733         struct usb_dev_state *ps;
2734
2735         /* Protect against simultaneous resume */
2736         mutex_lock(&usbfs_mutex);
2737         while (!list_empty(&udev->filelist)) {
2738                 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2739                 destroy_all_async(ps);
2740                 wake_up_all(&ps->wait);
2741                 WRITE_ONCE(ps->not_yet_resumed, 0);
2742                 wake_up_all(&ps->wait_for_resume);
2743                 list_del_init(&ps->list);
2744                 if (ps->discsignr)
2745                         kill_pid_usb_asyncio(ps->discsignr, EPIPE, ps->disccontext,
2746                                              ps->disc_pid, ps->cred);
2747         }
2748         mutex_unlock(&usbfs_mutex);
2749 }
2750
2751 static int usbdev_notify(struct notifier_block *self,
2752                                unsigned long action, void *dev)
2753 {
2754         switch (action) {
2755         case USB_DEVICE_ADD:
2756                 break;
2757         case USB_DEVICE_REMOVE:
2758                 usbdev_remove(dev);
2759                 break;
2760         }
2761         return NOTIFY_OK;
2762 }
2763
2764 static struct notifier_block usbdev_nb = {
2765         .notifier_call =        usbdev_notify,
2766 };
2767
2768 static struct cdev usb_device_cdev;
2769
2770 int __init usb_devio_init(void)
2771 {
2772         int retval;
2773
2774         retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2775                                         "usb_device");
2776         if (retval) {
2777                 printk(KERN_ERR "Unable to register minors for usb_device\n");
2778                 goto out;
2779         }
2780         cdev_init(&usb_device_cdev, &usbdev_file_operations);
2781         retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2782         if (retval) {
2783                 printk(KERN_ERR "Unable to get usb_device major %d\n",
2784                        USB_DEVICE_MAJOR);
2785                 goto error_cdev;
2786         }
2787         usb_register_notify(&usbdev_nb);
2788 out:
2789         return retval;
2790
2791 error_cdev:
2792         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2793         goto out;
2794 }
2795
2796 void usb_devio_cleanup(void)
2797 {
2798         usb_unregister_notify(&usbdev_nb);
2799         cdev_del(&usb_device_cdev);
2800         unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2801 }