1 /*****************************************************************************/ 2 3 /* 4 * devio.c -- User space communication with USB devices. 5 * 6 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch) 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 * 22 * This file implements the usbfs/x/y files, where 23 * x is the bus number and y the device number. 24 * 25 * It allows user space programs/"drivers" to communicate directly 26 * with USB devices without intervening kernel driver. 27 * 28 * Revision history 29 * 22.12.1999 0.1 Initial release (split from proc_usb.c) 30 * 04.01.2000 0.2 Turned into its own filesystem 31 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery 32 * (CAN-2005-3055) 33 */ 34 35 /*****************************************************************************/ 36 37 #include <linux/fs.h> 38 #include <linux/mm.h> 39 #include <linux/slab.h> 40 #include <linux/smp_lock.h> 41 #include <linux/signal.h> 42 #include <linux/poll.h> 43 #include <linux/module.h> 44 #include <linux/usb.h> 45 #include <linux/usbdevice_fs.h> 46 #include <linux/cdev.h> 47 #include <linux/notifier.h> 48 #include <linux/security.h> 49 #include <asm/uaccess.h> 50 #include <asm/byteorder.h> 51 #include <linux/moduleparam.h> 52 53 #include "hcd.h" /* for usbcore internals */ 54 #include "usb.h" 55 56 #define USB_MAXBUS 64 57 #define USB_DEVICE_MAX USB_MAXBUS * 128 58 59 /* Mutual exclusion for removal, open, and release */ 60 DEFINE_MUTEX(usbfs_mutex); 61 62 struct dev_state { 63 struct list_head list; /* state list */ 64 struct usb_device *dev; 65 struct file *file; 66 spinlock_t lock; /* protects the async urb lists */ 67 struct list_head async_pending; 68 struct list_head async_completed; 69 wait_queue_head_t wait; /* wake up if a request completed */ 70 unsigned int discsignr; 71 struct pid *disc_pid; 72 uid_t disc_uid, disc_euid; 73 void __user *disccontext; 74 unsigned long ifclaimed; 75 u32 secid; 76 }; 77 78 struct async { 79 struct list_head asynclist; 80 struct dev_state *ps; 81 struct pid *pid; 82 uid_t uid, euid; 83 unsigned int signr; 84 unsigned int ifnum; 85 void __user *userbuffer; 86 void __user *userurb; 87 struct urb *urb; 88 int status; 89 u32 secid; 90 }; 91 92 static int usbfs_snoop; 93 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR); 94 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic"); 95 96 #define snoop(dev, format, arg...) \ 97 do { \ 98 if (usbfs_snoop) \ 99 dev_info(dev , format , ## arg); \ 100 } while (0) 101 102 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0) 103 104 105 #define MAX_USBFS_BUFFER_SIZE 16384 106 107 static int connected(struct dev_state *ps) 108 { 109 return (!list_empty(&ps->list) && 110 ps->dev->state != USB_STATE_NOTATTACHED); 111 } 112 113 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig) 114 { 115 loff_t ret; 116 117 lock_kernel(); 118 119 switch (orig) { 120 case 0: 121 file->f_pos = offset; 122 ret = file->f_pos; 123 break; 124 case 1: 125 file->f_pos += offset; 126 ret = file->f_pos; 127 break; 128 case 2: 129 default: 130 ret = -EINVAL; 131 } 132 133 unlock_kernel(); 134 return ret; 135 } 136 137 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, 138 loff_t *ppos) 139 { 140 struct dev_state *ps = file->private_data; 141 struct usb_device *dev = ps->dev; 142 ssize_t ret = 0; 143 unsigned len; 144 loff_t pos; 145 int i; 146 147 pos = *ppos; 148 usb_lock_device(dev); 149 if (!connected(ps)) { 150 ret = -ENODEV; 151 goto err; 152 } else if (pos < 0) { 153 ret = -EINVAL; 154 goto err; 155 } 156 157 if (pos < sizeof(struct usb_device_descriptor)) { 158 /* 18 bytes - fits on the stack */ 159 struct usb_device_descriptor temp_desc; 160 161 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor)); 162 le16_to_cpus(&temp_desc.bcdUSB); 163 le16_to_cpus(&temp_desc.idVendor); 164 le16_to_cpus(&temp_desc.idProduct); 165 le16_to_cpus(&temp_desc.bcdDevice); 166 167 len = sizeof(struct usb_device_descriptor) - pos; 168 if (len > nbytes) 169 len = nbytes; 170 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) { 171 ret = -EFAULT; 172 goto err; 173 } 174 175 *ppos += len; 176 buf += len; 177 nbytes -= len; 178 ret += len; 179 } 180 181 pos = sizeof(struct usb_device_descriptor); 182 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) { 183 struct usb_config_descriptor *config = 184 (struct usb_config_descriptor *)dev->rawdescriptors[i]; 185 unsigned int length = le16_to_cpu(config->wTotalLength); 186 187 if (*ppos < pos + length) { 188 189 /* The descriptor may claim to be longer than it 190 * really is. Here is the actual allocated length. */ 191 unsigned alloclen = 192 le16_to_cpu(dev->config[i].desc.wTotalLength); 193 194 len = length - (*ppos - pos); 195 if (len > nbytes) 196 len = nbytes; 197 198 /* Simply don't write (skip over) unallocated parts */ 199 if (alloclen > (*ppos - pos)) { 200 alloclen -= (*ppos - pos); 201 if (copy_to_user(buf, 202 dev->rawdescriptors[i] + (*ppos - pos), 203 min(len, alloclen))) { 204 ret = -EFAULT; 205 goto err; 206 } 207 } 208 209 *ppos += len; 210 buf += len; 211 nbytes -= len; 212 ret += len; 213 } 214 215 pos += length; 216 } 217 218 err: 219 usb_unlock_device(dev); 220 return ret; 221 } 222 223 /* 224 * async list handling 225 */ 226 227 static struct async *alloc_async(unsigned int numisoframes) 228 { 229 struct async *as; 230 231 as = kzalloc(sizeof(struct async), GFP_KERNEL); 232 if (!as) 233 return NULL; 234 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL); 235 if (!as->urb) { 236 kfree(as); 237 return NULL; 238 } 239 return as; 240 } 241 242 static void free_async(struct async *as) 243 { 244 put_pid(as->pid); 245 kfree(as->urb->transfer_buffer); 246 kfree(as->urb->setup_packet); 247 usb_free_urb(as->urb); 248 kfree(as); 249 } 250 251 static void async_newpending(struct async *as) 252 { 253 struct dev_state *ps = as->ps; 254 unsigned long flags; 255 256 spin_lock_irqsave(&ps->lock, flags); 257 list_add_tail(&as->asynclist, &ps->async_pending); 258 spin_unlock_irqrestore(&ps->lock, flags); 259 } 260 261 static void async_removepending(struct async *as) 262 { 263 struct dev_state *ps = as->ps; 264 unsigned long flags; 265 266 spin_lock_irqsave(&ps->lock, flags); 267 list_del_init(&as->asynclist); 268 spin_unlock_irqrestore(&ps->lock, flags); 269 } 270 271 static struct async *async_getcompleted(struct dev_state *ps) 272 { 273 unsigned long flags; 274 struct async *as = NULL; 275 276 spin_lock_irqsave(&ps->lock, flags); 277 if (!list_empty(&ps->async_completed)) { 278 as = list_entry(ps->async_completed.next, struct async, 279 asynclist); 280 list_del_init(&as->asynclist); 281 } 282 spin_unlock_irqrestore(&ps->lock, flags); 283 return as; 284 } 285 286 static struct async *async_getpending(struct dev_state *ps, 287 void __user *userurb) 288 { 289 unsigned long flags; 290 struct async *as; 291 292 spin_lock_irqsave(&ps->lock, flags); 293 list_for_each_entry(as, &ps->async_pending, asynclist) 294 if (as->userurb == userurb) { 295 list_del_init(&as->asynclist); 296 spin_unlock_irqrestore(&ps->lock, flags); 297 return as; 298 } 299 spin_unlock_irqrestore(&ps->lock, flags); 300 return NULL; 301 } 302 303 static void snoop_urb(struct urb *urb, void __user *userurb) 304 { 305 unsigned j; 306 unsigned char *data = urb->transfer_buffer; 307 308 if (!usbfs_snoop) 309 return; 310 311 dev_info(&urb->dev->dev, "direction=%s\n", 312 usb_urb_dir_in(urb) ? "IN" : "OUT"); 313 dev_info(&urb->dev->dev, "userurb=%p\n", userurb); 314 dev_info(&urb->dev->dev, "transfer_buffer_length=%u\n", 315 urb->transfer_buffer_length); 316 dev_info(&urb->dev->dev, "actual_length=%u\n", urb->actual_length); 317 dev_info(&urb->dev->dev, "data: "); 318 for (j = 0; j < urb->transfer_buffer_length; ++j) 319 printk("%02x ", data[j]); 320 printk("\n"); 321 } 322 323 static void async_completed(struct urb *urb) 324 { 325 struct async *as = urb->context; 326 struct dev_state *ps = as->ps; 327 struct siginfo sinfo; 328 329 spin_lock(&ps->lock); 330 list_move_tail(&as->asynclist, &ps->async_completed); 331 spin_unlock(&ps->lock); 332 as->status = urb->status; 333 if (as->signr) { 334 sinfo.si_signo = as->signr; 335 sinfo.si_errno = as->status; 336 sinfo.si_code = SI_ASYNCIO; 337 sinfo.si_addr = as->userurb; 338 kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid, 339 as->euid, as->secid); 340 } 341 snoop(&urb->dev->dev, "urb complete\n"); 342 snoop_urb(urb, as->userurb); 343 wake_up(&ps->wait); 344 } 345 346 static void destroy_async(struct dev_state *ps, struct list_head *list) 347 { 348 struct async *as; 349 unsigned long flags; 350 351 spin_lock_irqsave(&ps->lock, flags); 352 while (!list_empty(list)) { 353 as = list_entry(list->next, struct async, asynclist); 354 list_del_init(&as->asynclist); 355 356 /* drop the spinlock so the completion handler can run */ 357 spin_unlock_irqrestore(&ps->lock, flags); 358 usb_kill_urb(as->urb); 359 spin_lock_irqsave(&ps->lock, flags); 360 } 361 spin_unlock_irqrestore(&ps->lock, flags); 362 } 363 364 static void destroy_async_on_interface(struct dev_state *ps, 365 unsigned int ifnum) 366 { 367 struct list_head *p, *q, hitlist; 368 unsigned long flags; 369 370 INIT_LIST_HEAD(&hitlist); 371 spin_lock_irqsave(&ps->lock, flags); 372 list_for_each_safe(p, q, &ps->async_pending) 373 if (ifnum == list_entry(p, struct async, asynclist)->ifnum) 374 list_move_tail(p, &hitlist); 375 spin_unlock_irqrestore(&ps->lock, flags); 376 destroy_async(ps, &hitlist); 377 } 378 379 static void destroy_all_async(struct dev_state *ps) 380 { 381 destroy_async(ps, &ps->async_pending); 382 } 383 384 /* 385 * interface claims are made only at the request of user level code, 386 * which can also release them (explicitly or by closing files). 387 * they're also undone when devices disconnect. 388 */ 389 390 static int driver_probe(struct usb_interface *intf, 391 const struct usb_device_id *id) 392 { 393 return -ENODEV; 394 } 395 396 static void driver_disconnect(struct usb_interface *intf) 397 { 398 struct dev_state *ps = usb_get_intfdata(intf); 399 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber; 400 401 if (!ps) 402 return; 403 404 /* NOTE: this relies on usbcore having canceled and completed 405 * all pending I/O requests; 2.6 does that. 406 */ 407 408 if (likely(ifnum < 8*sizeof(ps->ifclaimed))) 409 clear_bit(ifnum, &ps->ifclaimed); 410 else 411 dev_warn(&intf->dev, "interface number %u out of range\n", 412 ifnum); 413 414 usb_set_intfdata(intf, NULL); 415 416 /* force async requests to complete */ 417 destroy_async_on_interface(ps, ifnum); 418 } 419 420 /* The following routines are merely placeholders. There is no way 421 * to inform a user task about suspend or resumes. 422 */ 423 static int driver_suspend(struct usb_interface *intf, pm_message_t msg) 424 { 425 return 0; 426 } 427 428 static int driver_resume(struct usb_interface *intf) 429 { 430 return 0; 431 } 432 433 struct usb_driver usbfs_driver = { 434 .name = "usbfs", 435 .probe = driver_probe, 436 .disconnect = driver_disconnect, 437 .suspend = driver_suspend, 438 .resume = driver_resume, 439 }; 440 441 static int claimintf(struct dev_state *ps, unsigned int ifnum) 442 { 443 struct usb_device *dev = ps->dev; 444 struct usb_interface *intf; 445 int err; 446 447 if (ifnum >= 8*sizeof(ps->ifclaimed)) 448 return -EINVAL; 449 /* already claimed */ 450 if (test_bit(ifnum, &ps->ifclaimed)) 451 return 0; 452 453 intf = usb_ifnum_to_if(dev, ifnum); 454 if (!intf) 455 err = -ENOENT; 456 else 457 err = usb_driver_claim_interface(&usbfs_driver, intf, ps); 458 if (err == 0) 459 set_bit(ifnum, &ps->ifclaimed); 460 return err; 461 } 462 463 static int releaseintf(struct dev_state *ps, unsigned int ifnum) 464 { 465 struct usb_device *dev; 466 struct usb_interface *intf; 467 int err; 468 469 err = -EINVAL; 470 if (ifnum >= 8*sizeof(ps->ifclaimed)) 471 return err; 472 dev = ps->dev; 473 intf = usb_ifnum_to_if(dev, ifnum); 474 if (!intf) 475 err = -ENOENT; 476 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) { 477 usb_driver_release_interface(&usbfs_driver, intf); 478 err = 0; 479 } 480 return err; 481 } 482 483 static int checkintf(struct dev_state *ps, unsigned int ifnum) 484 { 485 if (ps->dev->state != USB_STATE_CONFIGURED) 486 return -EHOSTUNREACH; 487 if (ifnum >= 8*sizeof(ps->ifclaimed)) 488 return -EINVAL; 489 if (test_bit(ifnum, &ps->ifclaimed)) 490 return 0; 491 /* if not yet claimed, claim it for the driver */ 492 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim " 493 "interface %u before use\n", task_pid_nr(current), 494 current->comm, ifnum); 495 return claimintf(ps, ifnum); 496 } 497 498 static int findintfep(struct usb_device *dev, unsigned int ep) 499 { 500 unsigned int i, j, e; 501 struct usb_interface *intf; 502 struct usb_host_interface *alts; 503 struct usb_endpoint_descriptor *endpt; 504 505 if (ep & ~(USB_DIR_IN|0xf)) 506 return -EINVAL; 507 if (!dev->actconfig) 508 return -ESRCH; 509 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { 510 intf = dev->actconfig->interface[i]; 511 for (j = 0; j < intf->num_altsetting; j++) { 512 alts = &intf->altsetting[j]; 513 for (e = 0; e < alts->desc.bNumEndpoints; e++) { 514 endpt = &alts->endpoint[e].desc; 515 if (endpt->bEndpointAddress == ep) 516 return alts->desc.bInterfaceNumber; 517 } 518 } 519 } 520 return -ENOENT; 521 } 522 523 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, 524 unsigned int index) 525 { 526 int ret = 0; 527 528 if (ps->dev->state != USB_STATE_UNAUTHENTICATED 529 && ps->dev->state != USB_STATE_ADDRESS 530 && ps->dev->state != USB_STATE_CONFIGURED) 531 return -EHOSTUNREACH; 532 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype)) 533 return 0; 534 535 index &= 0xff; 536 switch (requesttype & USB_RECIP_MASK) { 537 case USB_RECIP_ENDPOINT: 538 ret = findintfep(ps->dev, index); 539 if (ret >= 0) 540 ret = checkintf(ps, ret); 541 break; 542 543 case USB_RECIP_INTERFACE: 544 ret = checkintf(ps, index); 545 break; 546 } 547 return ret; 548 } 549 550 static int match_devt(struct device *dev, void *data) 551 { 552 return dev->devt == (dev_t) (unsigned long) data; 553 } 554 555 static struct usb_device *usbdev_lookup_by_devt(dev_t devt) 556 { 557 struct device *dev; 558 559 dev = bus_find_device(&usb_bus_type, NULL, 560 (void *) (unsigned long) devt, match_devt); 561 if (!dev) 562 return NULL; 563 return container_of(dev, struct usb_device, dev); 564 } 565 566 /* 567 * file operations 568 */ 569 static int usbdev_open(struct inode *inode, struct file *file) 570 { 571 struct usb_device *dev = NULL; 572 struct dev_state *ps; 573 const struct cred *cred = current_cred(); 574 int ret; 575 576 lock_kernel(); 577 /* Protect against simultaneous removal or release */ 578 mutex_lock(&usbfs_mutex); 579 580 ret = -ENOMEM; 581 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL); 582 if (!ps) 583 goto out; 584 585 ret = -ENOENT; 586 587 /* usbdev device-node */ 588 if (imajor(inode) == USB_DEVICE_MAJOR) 589 dev = usbdev_lookup_by_devt(inode->i_rdev); 590 #ifdef CONFIG_USB_DEVICEFS 591 /* procfs file */ 592 if (!dev) { 593 dev = inode->i_private; 594 if (dev && dev->usbfs_dentry && 595 dev->usbfs_dentry->d_inode == inode) 596 usb_get_dev(dev); 597 else 598 dev = NULL; 599 } 600 #endif 601 if (!dev || dev->state == USB_STATE_NOTATTACHED) 602 goto out; 603 ret = usb_autoresume_device(dev); 604 if (ret) 605 goto out; 606 607 ret = 0; 608 ps->dev = dev; 609 ps->file = file; 610 spin_lock_init(&ps->lock); 611 INIT_LIST_HEAD(&ps->list); 612 INIT_LIST_HEAD(&ps->async_pending); 613 INIT_LIST_HEAD(&ps->async_completed); 614 init_waitqueue_head(&ps->wait); 615 ps->discsignr = 0; 616 ps->disc_pid = get_pid(task_pid(current)); 617 ps->disc_uid = cred->uid; 618 ps->disc_euid = cred->euid; 619 ps->disccontext = NULL; 620 ps->ifclaimed = 0; 621 security_task_getsecid(current, &ps->secid); 622 smp_wmb(); 623 list_add_tail(&ps->list, &dev->filelist); 624 file->private_data = ps; 625 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current), 626 current->comm); 627 out: 628 if (ret) { 629 kfree(ps); 630 usb_put_dev(dev); 631 } 632 mutex_unlock(&usbfs_mutex); 633 unlock_kernel(); 634 return ret; 635 } 636 637 static int usbdev_release(struct inode *inode, struct file *file) 638 { 639 struct dev_state *ps = file->private_data; 640 struct usb_device *dev = ps->dev; 641 unsigned int ifnum; 642 struct async *as; 643 644 usb_lock_device(dev); 645 646 /* Protect against simultaneous open */ 647 mutex_lock(&usbfs_mutex); 648 list_del_init(&ps->list); 649 mutex_unlock(&usbfs_mutex); 650 651 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed); 652 ifnum++) { 653 if (test_bit(ifnum, &ps->ifclaimed)) 654 releaseintf(ps, ifnum); 655 } 656 destroy_all_async(ps); 657 usb_autosuspend_device(dev); 658 usb_unlock_device(dev); 659 usb_put_dev(dev); 660 put_pid(ps->disc_pid); 661 662 as = async_getcompleted(ps); 663 while (as) { 664 free_async(as); 665 as = async_getcompleted(ps); 666 } 667 kfree(ps); 668 return 0; 669 } 670 671 static int proc_control(struct dev_state *ps, void __user *arg) 672 { 673 struct usb_device *dev = ps->dev; 674 struct usbdevfs_ctrltransfer ctrl; 675 unsigned int tmo; 676 unsigned char *tbuf; 677 unsigned wLength; 678 int i, j, ret; 679 680 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 681 return -EFAULT; 682 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex); 683 if (ret) 684 return ret; 685 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */ 686 if (wLength > PAGE_SIZE) 687 return -EINVAL; 688 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL); 689 if (!tbuf) 690 return -ENOMEM; 691 tmo = ctrl.timeout; 692 if (ctrl.bRequestType & 0x80) { 693 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, 694 ctrl.wLength)) { 695 free_page((unsigned long)tbuf); 696 return -EINVAL; 697 } 698 snoop(&dev->dev, "control read: bRequest=%02x " 699 "bRrequestType=%02x wValue=%04x " 700 "wIndex=%04x wLength=%04x\n", 701 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, 702 ctrl.wIndex, ctrl.wLength); 703 704 usb_unlock_device(dev); 705 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, 706 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 707 tbuf, ctrl.wLength, tmo); 708 usb_lock_device(dev); 709 if ((i > 0) && ctrl.wLength) { 710 if (usbfs_snoop) { 711 dev_info(&dev->dev, "control read: data "); 712 for (j = 0; j < i; ++j) 713 printk("%02x ", (u8)(tbuf)[j]); 714 printk("\n"); 715 } 716 if (copy_to_user(ctrl.data, tbuf, i)) { 717 free_page((unsigned long)tbuf); 718 return -EFAULT; 719 } 720 } 721 } else { 722 if (ctrl.wLength) { 723 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) { 724 free_page((unsigned long)tbuf); 725 return -EFAULT; 726 } 727 } 728 snoop(&dev->dev, "control write: bRequest=%02x " 729 "bRrequestType=%02x wValue=%04x " 730 "wIndex=%04x wLength=%04x\n", 731 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, 732 ctrl.wIndex, ctrl.wLength); 733 if (usbfs_snoop) { 734 dev_info(&dev->dev, "control write: data: "); 735 for (j = 0; j < ctrl.wLength; ++j) 736 printk("%02x ", (unsigned char)(tbuf)[j]); 737 printk("\n"); 738 } 739 usb_unlock_device(dev); 740 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, 741 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 742 tbuf, ctrl.wLength, tmo); 743 usb_lock_device(dev); 744 } 745 free_page((unsigned long)tbuf); 746 if (i < 0 && i != -EPIPE) { 747 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL " 748 "failed cmd %s rqt %u rq %u len %u ret %d\n", 749 current->comm, ctrl.bRequestType, ctrl.bRequest, 750 ctrl.wLength, i); 751 } 752 return i; 753 } 754 755 static int proc_bulk(struct dev_state *ps, void __user *arg) 756 { 757 struct usb_device *dev = ps->dev; 758 struct usbdevfs_bulktransfer bulk; 759 unsigned int tmo, len1, pipe; 760 int len2; 761 unsigned char *tbuf; 762 int i, j, ret; 763 764 if (copy_from_user(&bulk, arg, sizeof(bulk))) 765 return -EFAULT; 766 ret = findintfep(ps->dev, bulk.ep); 767 if (ret < 0) 768 return ret; 769 ret = checkintf(ps, ret); 770 if (ret) 771 return ret; 772 if (bulk.ep & USB_DIR_IN) 773 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f); 774 else 775 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f); 776 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN))) 777 return -EINVAL; 778 len1 = bulk.len; 779 if (len1 > MAX_USBFS_BUFFER_SIZE) 780 return -EINVAL; 781 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) 782 return -ENOMEM; 783 tmo = bulk.timeout; 784 if (bulk.ep & 0x80) { 785 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) { 786 kfree(tbuf); 787 return -EINVAL; 788 } 789 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n", 790 bulk.len, bulk.timeout); 791 usb_unlock_device(dev); 792 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 793 usb_lock_device(dev); 794 if (!i && len2) { 795 if (usbfs_snoop) { 796 dev_info(&dev->dev, "bulk read: data "); 797 for (j = 0; j < len2; ++j) 798 printk("%02x ", (u8)(tbuf)[j]); 799 printk("\n"); 800 } 801 if (copy_to_user(bulk.data, tbuf, len2)) { 802 kfree(tbuf); 803 return -EFAULT; 804 } 805 } 806 } else { 807 if (len1) { 808 if (copy_from_user(tbuf, bulk.data, len1)) { 809 kfree(tbuf); 810 return -EFAULT; 811 } 812 } 813 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n", 814 bulk.len, bulk.timeout); 815 if (usbfs_snoop) { 816 dev_info(&dev->dev, "bulk write: data: "); 817 for (j = 0; j < len1; ++j) 818 printk("%02x ", (unsigned char)(tbuf)[j]); 819 printk("\n"); 820 } 821 usb_unlock_device(dev); 822 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 823 usb_lock_device(dev); 824 } 825 kfree(tbuf); 826 if (i < 0) 827 return i; 828 return len2; 829 } 830 831 static int proc_resetep(struct dev_state *ps, void __user *arg) 832 { 833 unsigned int ep; 834 int ret; 835 836 if (get_user(ep, (unsigned int __user *)arg)) 837 return -EFAULT; 838 ret = findintfep(ps->dev, ep); 839 if (ret < 0) 840 return ret; 841 ret = checkintf(ps, ret); 842 if (ret) 843 return ret; 844 usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0); 845 return 0; 846 } 847 848 static int proc_clearhalt(struct dev_state *ps, void __user *arg) 849 { 850 unsigned int ep; 851 int pipe; 852 int ret; 853 854 if (get_user(ep, (unsigned int __user *)arg)) 855 return -EFAULT; 856 ret = findintfep(ps->dev, ep); 857 if (ret < 0) 858 return ret; 859 ret = checkintf(ps, ret); 860 if (ret) 861 return ret; 862 if (ep & USB_DIR_IN) 863 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f); 864 else 865 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f); 866 867 return usb_clear_halt(ps->dev, pipe); 868 } 869 870 static int proc_getdriver(struct dev_state *ps, void __user *arg) 871 { 872 struct usbdevfs_getdriver gd; 873 struct usb_interface *intf; 874 int ret; 875 876 if (copy_from_user(&gd, arg, sizeof(gd))) 877 return -EFAULT; 878 intf = usb_ifnum_to_if(ps->dev, gd.interface); 879 if (!intf || !intf->dev.driver) 880 ret = -ENODATA; 881 else { 882 strncpy(gd.driver, intf->dev.driver->name, 883 sizeof(gd.driver)); 884 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0); 885 } 886 return ret; 887 } 888 889 static int proc_connectinfo(struct dev_state *ps, void __user *arg) 890 { 891 struct usbdevfs_connectinfo ci; 892 893 ci.devnum = ps->dev->devnum; 894 ci.slow = ps->dev->speed == USB_SPEED_LOW; 895 if (copy_to_user(arg, &ci, sizeof(ci))) 896 return -EFAULT; 897 return 0; 898 } 899 900 static int proc_resetdevice(struct dev_state *ps) 901 { 902 return usb_reset_device(ps->dev); 903 } 904 905 static int proc_setintf(struct dev_state *ps, void __user *arg) 906 { 907 struct usbdevfs_setinterface setintf; 908 int ret; 909 910 if (copy_from_user(&setintf, arg, sizeof(setintf))) 911 return -EFAULT; 912 if ((ret = checkintf(ps, setintf.interface))) 913 return ret; 914 return usb_set_interface(ps->dev, setintf.interface, 915 setintf.altsetting); 916 } 917 918 static int proc_setconfig(struct dev_state *ps, void __user *arg) 919 { 920 int u; 921 int status = 0; 922 struct usb_host_config *actconfig; 923 924 if (get_user(u, (int __user *)arg)) 925 return -EFAULT; 926 927 actconfig = ps->dev->actconfig; 928 929 /* Don't touch the device if any interfaces are claimed. 930 * It could interfere with other drivers' operations, and if 931 * an interface is claimed by usbfs it could easily deadlock. 932 */ 933 if (actconfig) { 934 int i; 935 936 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) { 937 if (usb_interface_claimed(actconfig->interface[i])) { 938 dev_warn(&ps->dev->dev, 939 "usbfs: interface %d claimed by %s " 940 "while '%s' sets config #%d\n", 941 actconfig->interface[i] 942 ->cur_altsetting 943 ->desc.bInterfaceNumber, 944 actconfig->interface[i] 945 ->dev.driver->name, 946 current->comm, u); 947 status = -EBUSY; 948 break; 949 } 950 } 951 } 952 953 /* SET_CONFIGURATION is often abused as a "cheap" driver reset, 954 * so avoid usb_set_configuration()'s kick to sysfs 955 */ 956 if (status == 0) { 957 if (actconfig && actconfig->desc.bConfigurationValue == u) 958 status = usb_reset_configuration(ps->dev); 959 else 960 status = usb_set_configuration(ps->dev, u); 961 } 962 963 return status; 964 } 965 966 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb, 967 struct usbdevfs_iso_packet_desc __user *iso_frame_desc, 968 void __user *arg) 969 { 970 struct usbdevfs_iso_packet_desc *isopkt = NULL; 971 struct usb_host_endpoint *ep; 972 struct async *as; 973 struct usb_ctrlrequest *dr = NULL; 974 const struct cred *cred = current_cred(); 975 unsigned int u, totlen, isofrmlen; 976 int ret, ifnum = -1; 977 int is_in; 978 979 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP | 980 USBDEVFS_URB_SHORT_NOT_OK | 981 USBDEVFS_URB_NO_FSBR | 982 USBDEVFS_URB_ZERO_PACKET | 983 USBDEVFS_URB_NO_INTERRUPT)) 984 return -EINVAL; 985 if (!uurb->buffer) 986 return -EINVAL; 987 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && 988 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) { 989 ifnum = findintfep(ps->dev, uurb->endpoint); 990 if (ifnum < 0) 991 return ifnum; 992 ret = checkintf(ps, ifnum); 993 if (ret) 994 return ret; 995 } 996 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) { 997 is_in = 1; 998 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 999 } else { 1000 is_in = 0; 1001 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 1002 } 1003 if (!ep) 1004 return -ENOENT; 1005 switch(uurb->type) { 1006 case USBDEVFS_URB_TYPE_CONTROL: 1007 if (!usb_endpoint_xfer_control(&ep->desc)) 1008 return -EINVAL; 1009 /* min 8 byte setup packet, 1010 * max 8 byte setup plus an arbitrary data stage */ 1011 if (uurb->buffer_length < 8 || 1012 uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE)) 1013 return -EINVAL; 1014 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); 1015 if (!dr) 1016 return -ENOMEM; 1017 if (copy_from_user(dr, uurb->buffer, 8)) { 1018 kfree(dr); 1019 return -EFAULT; 1020 } 1021 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) { 1022 kfree(dr); 1023 return -EINVAL; 1024 } 1025 ret = check_ctrlrecip(ps, dr->bRequestType, 1026 le16_to_cpup(&dr->wIndex)); 1027 if (ret) { 1028 kfree(dr); 1029 return ret; 1030 } 1031 uurb->number_of_packets = 0; 1032 uurb->buffer_length = le16_to_cpup(&dr->wLength); 1033 uurb->buffer += 8; 1034 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) { 1035 is_in = 1; 1036 uurb->endpoint |= USB_DIR_IN; 1037 } else { 1038 is_in = 0; 1039 uurb->endpoint &= ~USB_DIR_IN; 1040 } 1041 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ, 1042 uurb->buffer, uurb->buffer_length)) { 1043 kfree(dr); 1044 return -EFAULT; 1045 } 1046 snoop(&ps->dev->dev, "control urb: bRequest=%02x " 1047 "bRrequestType=%02x wValue=%04x " 1048 "wIndex=%04x wLength=%04x\n", 1049 dr->bRequest, dr->bRequestType, 1050 __le16_to_cpup(&dr->wValue), 1051 __le16_to_cpup(&dr->wIndex), 1052 __le16_to_cpup(&dr->wLength)); 1053 break; 1054 1055 case USBDEVFS_URB_TYPE_BULK: 1056 switch (usb_endpoint_type(&ep->desc)) { 1057 case USB_ENDPOINT_XFER_CONTROL: 1058 case USB_ENDPOINT_XFER_ISOC: 1059 return -EINVAL; 1060 /* allow single-shot interrupt transfers, at bogus rates */ 1061 } 1062 uurb->number_of_packets = 0; 1063 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE) 1064 return -EINVAL; 1065 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ, 1066 uurb->buffer, uurb->buffer_length)) 1067 return -EFAULT; 1068 snoop(&ps->dev->dev, "bulk urb\n"); 1069 break; 1070 1071 case USBDEVFS_URB_TYPE_ISO: 1072 /* arbitrary limit */ 1073 if (uurb->number_of_packets < 1 || 1074 uurb->number_of_packets > 128) 1075 return -EINVAL; 1076 if (!usb_endpoint_xfer_isoc(&ep->desc)) 1077 return -EINVAL; 1078 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * 1079 uurb->number_of_packets; 1080 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL))) 1081 return -ENOMEM; 1082 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) { 1083 kfree(isopkt); 1084 return -EFAULT; 1085 } 1086 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1087 /* arbitrary limit, 1088 * sufficient for USB 2.0 high-bandwidth iso */ 1089 if (isopkt[u].length > 8192) { 1090 kfree(isopkt); 1091 return -EINVAL; 1092 } 1093 totlen += isopkt[u].length; 1094 } 1095 if (totlen > 32768) { 1096 kfree(isopkt); 1097 return -EINVAL; 1098 } 1099 uurb->buffer_length = totlen; 1100 snoop(&ps->dev->dev, "iso urb\n"); 1101 break; 1102 1103 case USBDEVFS_URB_TYPE_INTERRUPT: 1104 uurb->number_of_packets = 0; 1105 if (!usb_endpoint_xfer_int(&ep->desc)) 1106 return -EINVAL; 1107 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE) 1108 return -EINVAL; 1109 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ, 1110 uurb->buffer, uurb->buffer_length)) 1111 return -EFAULT; 1112 snoop(&ps->dev->dev, "interrupt urb\n"); 1113 break; 1114 1115 default: 1116 return -EINVAL; 1117 } 1118 as = alloc_async(uurb->number_of_packets); 1119 if (!as) { 1120 kfree(isopkt); 1121 kfree(dr); 1122 return -ENOMEM; 1123 } 1124 as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL); 1125 if (!as->urb->transfer_buffer) { 1126 kfree(isopkt); 1127 kfree(dr); 1128 free_async(as); 1129 return -ENOMEM; 1130 } 1131 as->urb->dev = ps->dev; 1132 as->urb->pipe = (uurb->type << 30) | 1133 __create_pipe(ps->dev, uurb->endpoint & 0xf) | 1134 (uurb->endpoint & USB_DIR_IN); 1135 1136 /* This tedious sequence is necessary because the URB_* flags 1137 * are internal to the kernel and subject to change, whereas 1138 * the USBDEVFS_URB_* flags are a user API and must not be changed. 1139 */ 1140 u = (is_in ? URB_DIR_IN : URB_DIR_OUT); 1141 if (uurb->flags & USBDEVFS_URB_ISO_ASAP) 1142 u |= URB_ISO_ASAP; 1143 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK) 1144 u |= URB_SHORT_NOT_OK; 1145 if (uurb->flags & USBDEVFS_URB_NO_FSBR) 1146 u |= URB_NO_FSBR; 1147 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET) 1148 u |= URB_ZERO_PACKET; 1149 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT) 1150 u |= URB_NO_INTERRUPT; 1151 as->urb->transfer_flags = u; 1152 1153 as->urb->transfer_buffer_length = uurb->buffer_length; 1154 as->urb->setup_packet = (unsigned char *)dr; 1155 as->urb->start_frame = uurb->start_frame; 1156 as->urb->number_of_packets = uurb->number_of_packets; 1157 if (uurb->type == USBDEVFS_URB_TYPE_ISO || 1158 ps->dev->speed == USB_SPEED_HIGH) 1159 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1); 1160 else 1161 as->urb->interval = ep->desc.bInterval; 1162 as->urb->context = as; 1163 as->urb->complete = async_completed; 1164 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1165 as->urb->iso_frame_desc[u].offset = totlen; 1166 as->urb->iso_frame_desc[u].length = isopkt[u].length; 1167 totlen += isopkt[u].length; 1168 } 1169 kfree(isopkt); 1170 as->ps = ps; 1171 as->userurb = arg; 1172 if (uurb->endpoint & USB_DIR_IN) 1173 as->userbuffer = uurb->buffer; 1174 else 1175 as->userbuffer = NULL; 1176 as->signr = uurb->signr; 1177 as->ifnum = ifnum; 1178 as->pid = get_pid(task_pid(current)); 1179 as->uid = cred->uid; 1180 as->euid = cred->euid; 1181 security_task_getsecid(current, &as->secid); 1182 if (!is_in) { 1183 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, 1184 as->urb->transfer_buffer_length)) { 1185 free_async(as); 1186 return -EFAULT; 1187 } 1188 } 1189 snoop_urb(as->urb, as->userurb); 1190 async_newpending(as); 1191 if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) { 1192 dev_printk(KERN_DEBUG, &ps->dev->dev, 1193 "usbfs: usb_submit_urb returned %d\n", ret); 1194 async_removepending(as); 1195 free_async(as); 1196 return ret; 1197 } 1198 return 0; 1199 } 1200 1201 static int proc_submiturb(struct dev_state *ps, void __user *arg) 1202 { 1203 struct usbdevfs_urb uurb; 1204 1205 if (copy_from_user(&uurb, arg, sizeof(uurb))) 1206 return -EFAULT; 1207 1208 return proc_do_submiturb(ps, &uurb, 1209 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), 1210 arg); 1211 } 1212 1213 static int proc_unlinkurb(struct dev_state *ps, void __user *arg) 1214 { 1215 struct async *as; 1216 1217 as = async_getpending(ps, arg); 1218 if (!as) 1219 return -EINVAL; 1220 usb_kill_urb(as->urb); 1221 return 0; 1222 } 1223 1224 static int processcompl(struct async *as, void __user * __user *arg) 1225 { 1226 struct urb *urb = as->urb; 1227 struct usbdevfs_urb __user *userurb = as->userurb; 1228 void __user *addr = as->userurb; 1229 unsigned int i; 1230 1231 if (as->userbuffer) 1232 if (copy_to_user(as->userbuffer, urb->transfer_buffer, 1233 urb->transfer_buffer_length)) 1234 return -EFAULT; 1235 if (put_user(as->status, &userurb->status)) 1236 return -EFAULT; 1237 if (put_user(urb->actual_length, &userurb->actual_length)) 1238 return -EFAULT; 1239 if (put_user(urb->error_count, &userurb->error_count)) 1240 return -EFAULT; 1241 1242 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 1243 for (i = 0; i < urb->number_of_packets; i++) { 1244 if (put_user(urb->iso_frame_desc[i].actual_length, 1245 &userurb->iso_frame_desc[i].actual_length)) 1246 return -EFAULT; 1247 if (put_user(urb->iso_frame_desc[i].status, 1248 &userurb->iso_frame_desc[i].status)) 1249 return -EFAULT; 1250 } 1251 } 1252 1253 free_async(as); 1254 1255 if (put_user(addr, (void __user * __user *)arg)) 1256 return -EFAULT; 1257 return 0; 1258 } 1259 1260 static struct async *reap_as(struct dev_state *ps) 1261 { 1262 DECLARE_WAITQUEUE(wait, current); 1263 struct async *as = NULL; 1264 struct usb_device *dev = ps->dev; 1265 1266 add_wait_queue(&ps->wait, &wait); 1267 for (;;) { 1268 __set_current_state(TASK_INTERRUPTIBLE); 1269 as = async_getcompleted(ps); 1270 if (as) 1271 break; 1272 if (signal_pending(current)) 1273 break; 1274 usb_unlock_device(dev); 1275 schedule(); 1276 usb_lock_device(dev); 1277 } 1278 remove_wait_queue(&ps->wait, &wait); 1279 set_current_state(TASK_RUNNING); 1280 return as; 1281 } 1282 1283 static int proc_reapurb(struct dev_state *ps, void __user *arg) 1284 { 1285 struct async *as = reap_as(ps); 1286 if (as) 1287 return processcompl(as, (void __user * __user *)arg); 1288 if (signal_pending(current)) 1289 return -EINTR; 1290 return -EIO; 1291 } 1292 1293 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg) 1294 { 1295 struct async *as; 1296 1297 if (!(as = async_getcompleted(ps))) 1298 return -EAGAIN; 1299 return processcompl(as, (void __user * __user *)arg); 1300 } 1301 1302 #ifdef CONFIG_COMPAT 1303 1304 static int get_urb32(struct usbdevfs_urb *kurb, 1305 struct usbdevfs_urb32 __user *uurb) 1306 { 1307 __u32 uptr; 1308 if (get_user(kurb->type, &uurb->type) || 1309 __get_user(kurb->endpoint, &uurb->endpoint) || 1310 __get_user(kurb->status, &uurb->status) || 1311 __get_user(kurb->flags, &uurb->flags) || 1312 __get_user(kurb->buffer_length, &uurb->buffer_length) || 1313 __get_user(kurb->actual_length, &uurb->actual_length) || 1314 __get_user(kurb->start_frame, &uurb->start_frame) || 1315 __get_user(kurb->number_of_packets, &uurb->number_of_packets) || 1316 __get_user(kurb->error_count, &uurb->error_count) || 1317 __get_user(kurb->signr, &uurb->signr)) 1318 return -EFAULT; 1319 1320 if (__get_user(uptr, &uurb->buffer)) 1321 return -EFAULT; 1322 kurb->buffer = compat_ptr(uptr); 1323 if (__get_user(uptr, &uurb->usercontext)) 1324 return -EFAULT; 1325 kurb->usercontext = compat_ptr(uptr); 1326 1327 return 0; 1328 } 1329 1330 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg) 1331 { 1332 struct usbdevfs_urb uurb; 1333 1334 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg)) 1335 return -EFAULT; 1336 1337 return proc_do_submiturb(ps, &uurb, 1338 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, 1339 arg); 1340 } 1341 1342 static int processcompl_compat(struct async *as, void __user * __user *arg) 1343 { 1344 struct urb *urb = as->urb; 1345 struct usbdevfs_urb32 __user *userurb = as->userurb; 1346 void __user *addr = as->userurb; 1347 unsigned int i; 1348 1349 if (as->userbuffer) 1350 if (copy_to_user(as->userbuffer, urb->transfer_buffer, 1351 urb->transfer_buffer_length)) 1352 return -EFAULT; 1353 if (put_user(as->status, &userurb->status)) 1354 return -EFAULT; 1355 if (put_user(urb->actual_length, &userurb->actual_length)) 1356 return -EFAULT; 1357 if (put_user(urb->error_count, &userurb->error_count)) 1358 return -EFAULT; 1359 1360 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 1361 for (i = 0; i < urb->number_of_packets; i++) { 1362 if (put_user(urb->iso_frame_desc[i].actual_length, 1363 &userurb->iso_frame_desc[i].actual_length)) 1364 return -EFAULT; 1365 if (put_user(urb->iso_frame_desc[i].status, 1366 &userurb->iso_frame_desc[i].status)) 1367 return -EFAULT; 1368 } 1369 } 1370 1371 free_async(as); 1372 if (put_user(ptr_to_compat(addr), (u32 __user *)arg)) 1373 return -EFAULT; 1374 return 0; 1375 } 1376 1377 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg) 1378 { 1379 struct async *as = reap_as(ps); 1380 if (as) 1381 return processcompl_compat(as, (void __user * __user *)arg); 1382 if (signal_pending(current)) 1383 return -EINTR; 1384 return -EIO; 1385 } 1386 1387 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg) 1388 { 1389 struct async *as; 1390 1391 if (!(as = async_getcompleted(ps))) 1392 return -EAGAIN; 1393 return processcompl_compat(as, (void __user * __user *)arg); 1394 } 1395 1396 #endif 1397 1398 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg) 1399 { 1400 struct usbdevfs_disconnectsignal ds; 1401 1402 if (copy_from_user(&ds, arg, sizeof(ds))) 1403 return -EFAULT; 1404 ps->discsignr = ds.signr; 1405 ps->disccontext = ds.context; 1406 return 0; 1407 } 1408 1409 static int proc_claiminterface(struct dev_state *ps, void __user *arg) 1410 { 1411 unsigned int ifnum; 1412 1413 if (get_user(ifnum, (unsigned int __user *)arg)) 1414 return -EFAULT; 1415 return claimintf(ps, ifnum); 1416 } 1417 1418 static int proc_releaseinterface(struct dev_state *ps, void __user *arg) 1419 { 1420 unsigned int ifnum; 1421 int ret; 1422 1423 if (get_user(ifnum, (unsigned int __user *)arg)) 1424 return -EFAULT; 1425 if ((ret = releaseintf(ps, ifnum)) < 0) 1426 return ret; 1427 destroy_async_on_interface (ps, ifnum); 1428 return 0; 1429 } 1430 1431 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl) 1432 { 1433 int size; 1434 void *buf = NULL; 1435 int retval = 0; 1436 struct usb_interface *intf = NULL; 1437 struct usb_driver *driver = NULL; 1438 1439 /* alloc buffer */ 1440 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) { 1441 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL) 1442 return -ENOMEM; 1443 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) { 1444 if (copy_from_user(buf, ctl->data, size)) { 1445 kfree(buf); 1446 return -EFAULT; 1447 } 1448 } else { 1449 memset(buf, 0, size); 1450 } 1451 } 1452 1453 if (!connected(ps)) { 1454 kfree(buf); 1455 return -ENODEV; 1456 } 1457 1458 if (ps->dev->state != USB_STATE_CONFIGURED) 1459 retval = -EHOSTUNREACH; 1460 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno))) 1461 retval = -EINVAL; 1462 else switch (ctl->ioctl_code) { 1463 1464 /* disconnect kernel driver from interface */ 1465 case USBDEVFS_DISCONNECT: 1466 if (intf->dev.driver) { 1467 driver = to_usb_driver(intf->dev.driver); 1468 dev_dbg(&intf->dev, "disconnect by usbfs\n"); 1469 usb_driver_release_interface(driver, intf); 1470 } else 1471 retval = -ENODATA; 1472 break; 1473 1474 /* let kernel drivers try to (re)bind to the interface */ 1475 case USBDEVFS_CONNECT: 1476 if (!intf->dev.driver) 1477 retval = device_attach(&intf->dev); 1478 else 1479 retval = -EBUSY; 1480 break; 1481 1482 /* talk directly to the interface's driver */ 1483 default: 1484 if (intf->dev.driver) 1485 driver = to_usb_driver(intf->dev.driver); 1486 if (driver == NULL || driver->ioctl == NULL) { 1487 retval = -ENOTTY; 1488 } else { 1489 retval = driver->ioctl(intf, ctl->ioctl_code, buf); 1490 if (retval == -ENOIOCTLCMD) 1491 retval = -ENOTTY; 1492 } 1493 } 1494 1495 /* cleanup and return */ 1496 if (retval >= 0 1497 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0 1498 && size > 0 1499 && copy_to_user(ctl->data, buf, size) != 0) 1500 retval = -EFAULT; 1501 1502 kfree(buf); 1503 return retval; 1504 } 1505 1506 static int proc_ioctl_default(struct dev_state *ps, void __user *arg) 1507 { 1508 struct usbdevfs_ioctl ctrl; 1509 1510 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 1511 return -EFAULT; 1512 return proc_ioctl(ps, &ctrl); 1513 } 1514 1515 #ifdef CONFIG_COMPAT 1516 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg) 1517 { 1518 struct usbdevfs_ioctl32 __user *uioc; 1519 struct usbdevfs_ioctl ctrl; 1520 u32 udata; 1521 1522 uioc = compat_ptr((long)arg); 1523 if (get_user(ctrl.ifno, &uioc->ifno) || 1524 get_user(ctrl.ioctl_code, &uioc->ioctl_code) || 1525 __get_user(udata, &uioc->data)) 1526 return -EFAULT; 1527 ctrl.data = compat_ptr(udata); 1528 1529 return proc_ioctl(ps, &ctrl); 1530 } 1531 #endif 1532 1533 /* 1534 * NOTE: All requests here that have interface numbers as parameters 1535 * are assuming that somehow the configuration has been prevented from 1536 * changing. But there's no mechanism to ensure that... 1537 */ 1538 static int usbdev_ioctl(struct inode *inode, struct file *file, 1539 unsigned int cmd, unsigned long arg) 1540 { 1541 struct dev_state *ps = file->private_data; 1542 struct usb_device *dev = ps->dev; 1543 void __user *p = (void __user *)arg; 1544 int ret = -ENOTTY; 1545 1546 if (!(file->f_mode & FMODE_WRITE)) 1547 return -EPERM; 1548 usb_lock_device(dev); 1549 if (!connected(ps)) { 1550 usb_unlock_device(dev); 1551 return -ENODEV; 1552 } 1553 1554 switch (cmd) { 1555 case USBDEVFS_CONTROL: 1556 snoop(&dev->dev, "%s: CONTROL\n", __func__); 1557 ret = proc_control(ps, p); 1558 if (ret >= 0) 1559 inode->i_mtime = CURRENT_TIME; 1560 break; 1561 1562 case USBDEVFS_BULK: 1563 snoop(&dev->dev, "%s: BULK\n", __func__); 1564 ret = proc_bulk(ps, p); 1565 if (ret >= 0) 1566 inode->i_mtime = CURRENT_TIME; 1567 break; 1568 1569 case USBDEVFS_RESETEP: 1570 snoop(&dev->dev, "%s: RESETEP\n", __func__); 1571 ret = proc_resetep(ps, p); 1572 if (ret >= 0) 1573 inode->i_mtime = CURRENT_TIME; 1574 break; 1575 1576 case USBDEVFS_RESET: 1577 snoop(&dev->dev, "%s: RESET\n", __func__); 1578 ret = proc_resetdevice(ps); 1579 break; 1580 1581 case USBDEVFS_CLEAR_HALT: 1582 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__); 1583 ret = proc_clearhalt(ps, p); 1584 if (ret >= 0) 1585 inode->i_mtime = CURRENT_TIME; 1586 break; 1587 1588 case USBDEVFS_GETDRIVER: 1589 snoop(&dev->dev, "%s: GETDRIVER\n", __func__); 1590 ret = proc_getdriver(ps, p); 1591 break; 1592 1593 case USBDEVFS_CONNECTINFO: 1594 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__); 1595 ret = proc_connectinfo(ps, p); 1596 break; 1597 1598 case USBDEVFS_SETINTERFACE: 1599 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__); 1600 ret = proc_setintf(ps, p); 1601 break; 1602 1603 case USBDEVFS_SETCONFIGURATION: 1604 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__); 1605 ret = proc_setconfig(ps, p); 1606 break; 1607 1608 case USBDEVFS_SUBMITURB: 1609 snoop(&dev->dev, "%s: SUBMITURB\n", __func__); 1610 ret = proc_submiturb(ps, p); 1611 if (ret >= 0) 1612 inode->i_mtime = CURRENT_TIME; 1613 break; 1614 1615 #ifdef CONFIG_COMPAT 1616 1617 case USBDEVFS_SUBMITURB32: 1618 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__); 1619 ret = proc_submiturb_compat(ps, p); 1620 if (ret >= 0) 1621 inode->i_mtime = CURRENT_TIME; 1622 break; 1623 1624 case USBDEVFS_REAPURB32: 1625 snoop(&dev->dev, "%s: REAPURB32\n", __func__); 1626 ret = proc_reapurb_compat(ps, p); 1627 break; 1628 1629 case USBDEVFS_REAPURBNDELAY32: 1630 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __func__); 1631 ret = proc_reapurbnonblock_compat(ps, p); 1632 break; 1633 1634 case USBDEVFS_IOCTL32: 1635 snoop(&dev->dev, "%s: IOCTL\n", __func__); 1636 ret = proc_ioctl_compat(ps, ptr_to_compat(p)); 1637 break; 1638 #endif 1639 1640 case USBDEVFS_DISCARDURB: 1641 snoop(&dev->dev, "%s: DISCARDURB\n", __func__); 1642 ret = proc_unlinkurb(ps, p); 1643 break; 1644 1645 case USBDEVFS_REAPURB: 1646 snoop(&dev->dev, "%s: REAPURB\n", __func__); 1647 ret = proc_reapurb(ps, p); 1648 break; 1649 1650 case USBDEVFS_REAPURBNDELAY: 1651 snoop(&dev->dev, "%s: REAPURBDELAY\n", __func__); 1652 ret = proc_reapurbnonblock(ps, p); 1653 break; 1654 1655 case USBDEVFS_DISCSIGNAL: 1656 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__); 1657 ret = proc_disconnectsignal(ps, p); 1658 break; 1659 1660 case USBDEVFS_CLAIMINTERFACE: 1661 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__); 1662 ret = proc_claiminterface(ps, p); 1663 break; 1664 1665 case USBDEVFS_RELEASEINTERFACE: 1666 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__); 1667 ret = proc_releaseinterface(ps, p); 1668 break; 1669 1670 case USBDEVFS_IOCTL: 1671 snoop(&dev->dev, "%s: IOCTL\n", __func__); 1672 ret = proc_ioctl_default(ps, p); 1673 break; 1674 } 1675 usb_unlock_device(dev); 1676 if (ret >= 0) 1677 inode->i_atime = CURRENT_TIME; 1678 return ret; 1679 } 1680 1681 /* No kernel lock - fine */ 1682 static unsigned int usbdev_poll(struct file *file, 1683 struct poll_table_struct *wait) 1684 { 1685 struct dev_state *ps = file->private_data; 1686 unsigned int mask = 0; 1687 1688 poll_wait(file, &ps->wait, wait); 1689 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed)) 1690 mask |= POLLOUT | POLLWRNORM; 1691 if (!connected(ps)) 1692 mask |= POLLERR | POLLHUP; 1693 return mask; 1694 } 1695 1696 const struct file_operations usbdev_file_operations = { 1697 .owner = THIS_MODULE, 1698 .llseek = usbdev_lseek, 1699 .read = usbdev_read, 1700 .poll = usbdev_poll, 1701 .ioctl = usbdev_ioctl, 1702 .open = usbdev_open, 1703 .release = usbdev_release, 1704 }; 1705 1706 static void usbdev_remove(struct usb_device *udev) 1707 { 1708 struct dev_state *ps; 1709 struct siginfo sinfo; 1710 1711 while (!list_empty(&udev->filelist)) { 1712 ps = list_entry(udev->filelist.next, struct dev_state, list); 1713 destroy_all_async(ps); 1714 wake_up_all(&ps->wait); 1715 list_del_init(&ps->list); 1716 if (ps->discsignr) { 1717 sinfo.si_signo = ps->discsignr; 1718 sinfo.si_errno = EPIPE; 1719 sinfo.si_code = SI_ASYNCIO; 1720 sinfo.si_addr = ps->disccontext; 1721 kill_pid_info_as_uid(ps->discsignr, &sinfo, 1722 ps->disc_pid, ps->disc_uid, 1723 ps->disc_euid, ps->secid); 1724 } 1725 } 1726 } 1727 1728 #ifdef CONFIG_USB_DEVICE_CLASS 1729 static struct class *usb_classdev_class; 1730 1731 static int usb_classdev_add(struct usb_device *dev) 1732 { 1733 struct device *cldev; 1734 1735 cldev = device_create(usb_classdev_class, &dev->dev, dev->dev.devt, 1736 NULL, "usbdev%d.%d", dev->bus->busnum, 1737 dev->devnum); 1738 if (IS_ERR(cldev)) 1739 return PTR_ERR(cldev); 1740 dev->usb_classdev = cldev; 1741 return 0; 1742 } 1743 1744 static void usb_classdev_remove(struct usb_device *dev) 1745 { 1746 if (dev->usb_classdev) 1747 device_unregister(dev->usb_classdev); 1748 } 1749 1750 #else 1751 #define usb_classdev_add(dev) 0 1752 #define usb_classdev_remove(dev) do {} while (0) 1753 1754 #endif 1755 1756 static int usbdev_notify(struct notifier_block *self, 1757 unsigned long action, void *dev) 1758 { 1759 switch (action) { 1760 case USB_DEVICE_ADD: 1761 if (usb_classdev_add(dev)) 1762 return NOTIFY_BAD; 1763 break; 1764 case USB_DEVICE_REMOVE: 1765 usb_classdev_remove(dev); 1766 usbdev_remove(dev); 1767 break; 1768 } 1769 return NOTIFY_OK; 1770 } 1771 1772 static struct notifier_block usbdev_nb = { 1773 .notifier_call = usbdev_notify, 1774 }; 1775 1776 static struct cdev usb_device_cdev; 1777 1778 int __init usb_devio_init(void) 1779 { 1780 int retval; 1781 1782 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX, 1783 "usb_device"); 1784 if (retval) { 1785 printk(KERN_ERR "Unable to register minors for usb_device\n"); 1786 goto out; 1787 } 1788 cdev_init(&usb_device_cdev, &usbdev_file_operations); 1789 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX); 1790 if (retval) { 1791 printk(KERN_ERR "Unable to get usb_device major %d\n", 1792 USB_DEVICE_MAJOR); 1793 goto error_cdev; 1794 } 1795 #ifdef CONFIG_USB_DEVICE_CLASS 1796 usb_classdev_class = class_create(THIS_MODULE, "usb_device"); 1797 if (IS_ERR(usb_classdev_class)) { 1798 printk(KERN_ERR "Unable to register usb_device class\n"); 1799 retval = PTR_ERR(usb_classdev_class); 1800 cdev_del(&usb_device_cdev); 1801 usb_classdev_class = NULL; 1802 goto out; 1803 } 1804 /* devices of this class shadow the major:minor of their parent 1805 * device, so clear ->dev_kobj to prevent adding duplicate entries 1806 * to /sys/dev 1807 */ 1808 usb_classdev_class->dev_kobj = NULL; 1809 #endif 1810 usb_register_notify(&usbdev_nb); 1811 out: 1812 return retval; 1813 1814 error_cdev: 1815 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 1816 goto out; 1817 } 1818 1819 void usb_devio_cleanup(void) 1820 { 1821 usb_unregister_notify(&usbdev_nb); 1822 #ifdef CONFIG_USB_DEVICE_CLASS 1823 class_destroy(usb_classdev_class); 1824 #endif 1825 cdev_del(&usb_device_cdev); 1826 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 1827 } 1828