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 inline 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 inline 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 inline 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 inline 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 inline 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 int 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=%d\n", 315 urb->transfer_buffer_length); 316 dev_info(&urb->dev->dev, "actual_length=%d\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 as = async_getcompleted(ps); 363 while (as) { 364 free_async(as); 365 as = async_getcompleted(ps); 366 } 367 } 368 369 static void destroy_async_on_interface(struct dev_state *ps, 370 unsigned int ifnum) 371 { 372 struct list_head *p, *q, hitlist; 373 unsigned long flags; 374 375 INIT_LIST_HEAD(&hitlist); 376 spin_lock_irqsave(&ps->lock, flags); 377 list_for_each_safe(p, q, &ps->async_pending) 378 if (ifnum == list_entry(p, struct async, asynclist)->ifnum) 379 list_move_tail(p, &hitlist); 380 spin_unlock_irqrestore(&ps->lock, flags); 381 destroy_async(ps, &hitlist); 382 } 383 384 static inline void destroy_all_async(struct dev_state *ps) 385 { 386 destroy_async(ps, &ps->async_pending); 387 } 388 389 /* 390 * interface claims are made only at the request of user level code, 391 * which can also release them (explicitly or by closing files). 392 * they're also undone when devices disconnect. 393 */ 394 395 static int driver_probe(struct usb_interface *intf, 396 const struct usb_device_id *id) 397 { 398 return -ENODEV; 399 } 400 401 static void driver_disconnect(struct usb_interface *intf) 402 { 403 struct dev_state *ps = usb_get_intfdata(intf); 404 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber; 405 406 if (!ps) 407 return; 408 409 /* NOTE: this relies on usbcore having canceled and completed 410 * all pending I/O requests; 2.6 does that. 411 */ 412 413 if (likely(ifnum < 8*sizeof(ps->ifclaimed))) 414 clear_bit(ifnum, &ps->ifclaimed); 415 else 416 dev_warn(&intf->dev, "interface number %u out of range\n", 417 ifnum); 418 419 usb_set_intfdata(intf, NULL); 420 421 /* force async requests to complete */ 422 destroy_async_on_interface(ps, ifnum); 423 } 424 425 /* The following routines are merely placeholders. There is no way 426 * to inform a user task about suspend or resumes. 427 */ 428 static int driver_suspend(struct usb_interface *intf, pm_message_t msg) 429 { 430 return 0; 431 } 432 433 static int driver_resume(struct usb_interface *intf) 434 { 435 return 0; 436 } 437 438 struct usb_driver usbfs_driver = { 439 .name = "usbfs", 440 .probe = driver_probe, 441 .disconnect = driver_disconnect, 442 .suspend = driver_suspend, 443 .resume = driver_resume, 444 }; 445 446 static int claimintf(struct dev_state *ps, unsigned int ifnum) 447 { 448 struct usb_device *dev = ps->dev; 449 struct usb_interface *intf; 450 int err; 451 452 if (ifnum >= 8*sizeof(ps->ifclaimed)) 453 return -EINVAL; 454 /* already claimed */ 455 if (test_bit(ifnum, &ps->ifclaimed)) 456 return 0; 457 458 intf = usb_ifnum_to_if(dev, ifnum); 459 if (!intf) 460 err = -ENOENT; 461 else 462 err = usb_driver_claim_interface(&usbfs_driver, intf, ps); 463 if (err == 0) 464 set_bit(ifnum, &ps->ifclaimed); 465 return err; 466 } 467 468 static int releaseintf(struct dev_state *ps, unsigned int ifnum) 469 { 470 struct usb_device *dev; 471 struct usb_interface *intf; 472 int err; 473 474 err = -EINVAL; 475 if (ifnum >= 8*sizeof(ps->ifclaimed)) 476 return err; 477 dev = ps->dev; 478 intf = usb_ifnum_to_if(dev, ifnum); 479 if (!intf) 480 err = -ENOENT; 481 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) { 482 usb_driver_release_interface(&usbfs_driver, intf); 483 err = 0; 484 } 485 return err; 486 } 487 488 static int checkintf(struct dev_state *ps, unsigned int ifnum) 489 { 490 if (ps->dev->state != USB_STATE_CONFIGURED) 491 return -EHOSTUNREACH; 492 if (ifnum >= 8*sizeof(ps->ifclaimed)) 493 return -EINVAL; 494 if (test_bit(ifnum, &ps->ifclaimed)) 495 return 0; 496 /* if not yet claimed, claim it for the driver */ 497 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim " 498 "interface %u before use\n", task_pid_nr(current), 499 current->comm, ifnum); 500 return claimintf(ps, ifnum); 501 } 502 503 static int findintfep(struct usb_device *dev, unsigned int ep) 504 { 505 unsigned int i, j, e; 506 struct usb_interface *intf; 507 struct usb_host_interface *alts; 508 struct usb_endpoint_descriptor *endpt; 509 510 if (ep & ~(USB_DIR_IN|0xf)) 511 return -EINVAL; 512 if (!dev->actconfig) 513 return -ESRCH; 514 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { 515 intf = dev->actconfig->interface[i]; 516 for (j = 0; j < intf->num_altsetting; j++) { 517 alts = &intf->altsetting[j]; 518 for (e = 0; e < alts->desc.bNumEndpoints; e++) { 519 endpt = &alts->endpoint[e].desc; 520 if (endpt->bEndpointAddress == ep) 521 return alts->desc.bInterfaceNumber; 522 } 523 } 524 } 525 return -ENOENT; 526 } 527 528 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, 529 unsigned int index) 530 { 531 int ret = 0; 532 533 if (ps->dev->state != USB_STATE_ADDRESS 534 && ps->dev->state != USB_STATE_CONFIGURED) 535 return -EHOSTUNREACH; 536 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype)) 537 return 0; 538 539 index &= 0xff; 540 switch (requesttype & USB_RECIP_MASK) { 541 case USB_RECIP_ENDPOINT: 542 ret = findintfep(ps->dev, index); 543 if (ret >= 0) 544 ret = checkintf(ps, ret); 545 break; 546 547 case USB_RECIP_INTERFACE: 548 ret = checkintf(ps, index); 549 break; 550 } 551 return ret; 552 } 553 554 static int match_devt(struct device *dev, void *data) 555 { 556 return dev->devt == (dev_t) (unsigned long) data; 557 } 558 559 static struct usb_device *usbdev_lookup_by_devt(dev_t devt) 560 { 561 struct device *dev; 562 563 dev = bus_find_device(&usb_bus_type, NULL, 564 (void *) (unsigned long) devt, match_devt); 565 if (!dev) 566 return NULL; 567 return container_of(dev, struct usb_device, dev); 568 } 569 570 /* 571 * file operations 572 */ 573 static int usbdev_open(struct inode *inode, struct file *file) 574 { 575 struct usb_device *dev = NULL; 576 struct dev_state *ps; 577 int ret; 578 579 lock_kernel(); 580 /* Protect against simultaneous removal or release */ 581 mutex_lock(&usbfs_mutex); 582 583 ret = -ENOMEM; 584 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL); 585 if (!ps) 586 goto out; 587 588 ret = -ENOENT; 589 590 /* usbdev device-node */ 591 if (imajor(inode) == USB_DEVICE_MAJOR) 592 dev = usbdev_lookup_by_devt(inode->i_rdev); 593 #ifdef CONFIG_USB_DEVICEFS 594 /* procfs file */ 595 if (!dev) { 596 dev = inode->i_private; 597 if (dev && dev->usbfs_dentry && 598 dev->usbfs_dentry->d_inode == inode) 599 usb_get_dev(dev); 600 else 601 dev = NULL; 602 } 603 #endif 604 if (!dev || dev->state == USB_STATE_NOTATTACHED) 605 goto out; 606 ret = usb_autoresume_device(dev); 607 if (ret) 608 goto out; 609 610 ret = 0; 611 ps->dev = dev; 612 ps->file = file; 613 spin_lock_init(&ps->lock); 614 INIT_LIST_HEAD(&ps->list); 615 INIT_LIST_HEAD(&ps->async_pending); 616 INIT_LIST_HEAD(&ps->async_completed); 617 init_waitqueue_head(&ps->wait); 618 ps->discsignr = 0; 619 ps->disc_pid = get_pid(task_pid(current)); 620 ps->disc_uid = current->uid; 621 ps->disc_euid = current->euid; 622 ps->disccontext = NULL; 623 ps->ifclaimed = 0; 624 security_task_getsecid(current, &ps->secid); 625 smp_wmb(); 626 list_add_tail(&ps->list, &dev->filelist); 627 file->private_data = ps; 628 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current), 629 current->comm); 630 out: 631 if (ret) { 632 kfree(ps); 633 usb_put_dev(dev); 634 } 635 mutex_unlock(&usbfs_mutex); 636 unlock_kernel(); 637 return ret; 638 } 639 640 static int usbdev_release(struct inode *inode, struct file *file) 641 { 642 struct dev_state *ps = file->private_data; 643 struct usb_device *dev = ps->dev; 644 unsigned int ifnum; 645 646 usb_lock_device(dev); 647 648 /* Protect against simultaneous open */ 649 mutex_lock(&usbfs_mutex); 650 list_del_init(&ps->list); 651 mutex_unlock(&usbfs_mutex); 652 653 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed); 654 ifnum++) { 655 if (test_bit(ifnum, &ps->ifclaimed)) 656 releaseintf(ps, ifnum); 657 } 658 destroy_all_async(ps); 659 usb_autosuspend_device(dev); 660 usb_unlock_device(dev); 661 usb_put_dev(dev); 662 put_pid(ps->disc_pid); 663 kfree(ps); 664 return 0; 665 } 666 667 static int proc_control(struct dev_state *ps, void __user *arg) 668 { 669 struct usb_device *dev = ps->dev; 670 struct usbdevfs_ctrltransfer ctrl; 671 unsigned int tmo; 672 unsigned char *tbuf; 673 unsigned wLength; 674 int i, j, ret; 675 676 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 677 return -EFAULT; 678 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex); 679 if (ret) 680 return ret; 681 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */ 682 if (wLength > PAGE_SIZE) 683 return -EINVAL; 684 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL); 685 if (!tbuf) 686 return -ENOMEM; 687 tmo = ctrl.timeout; 688 if (ctrl.bRequestType & 0x80) { 689 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, 690 ctrl.wLength)) { 691 free_page((unsigned long)tbuf); 692 return -EINVAL; 693 } 694 snoop(&dev->dev, "control read: bRequest=%02x " 695 "bRrequestType=%02x wValue=%04x " 696 "wIndex=%04x wLength=%04x\n", 697 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, 698 ctrl.wIndex, ctrl.wLength); 699 700 usb_unlock_device(dev); 701 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, 702 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 703 tbuf, ctrl.wLength, tmo); 704 usb_lock_device(dev); 705 if ((i > 0) && ctrl.wLength) { 706 if (usbfs_snoop) { 707 dev_info(&dev->dev, "control read: data "); 708 for (j = 0; j < i; ++j) 709 printk("%02x ", (u8)(tbuf)[j]); 710 printk("\n"); 711 } 712 if (copy_to_user(ctrl.data, tbuf, i)) { 713 free_page((unsigned long)tbuf); 714 return -EFAULT; 715 } 716 } 717 } else { 718 if (ctrl.wLength) { 719 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) { 720 free_page((unsigned long)tbuf); 721 return -EFAULT; 722 } 723 } 724 snoop(&dev->dev, "control write: bRequest=%02x " 725 "bRrequestType=%02x wValue=%04x " 726 "wIndex=%04x wLength=%04x\n", 727 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, 728 ctrl.wIndex, ctrl.wLength); 729 if (usbfs_snoop) { 730 dev_info(&dev->dev, "control write: data: "); 731 for (j = 0; j < ctrl.wLength; ++j) 732 printk("%02x ", (unsigned char)(tbuf)[j]); 733 printk("\n"); 734 } 735 usb_unlock_device(dev); 736 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, 737 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 738 tbuf, ctrl.wLength, tmo); 739 usb_lock_device(dev); 740 } 741 free_page((unsigned long)tbuf); 742 if (i < 0 && i != -EPIPE) { 743 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL " 744 "failed cmd %s rqt %u rq %u len %u ret %d\n", 745 current->comm, ctrl.bRequestType, ctrl.bRequest, 746 ctrl.wLength, i); 747 } 748 return i; 749 } 750 751 static int proc_bulk(struct dev_state *ps, void __user *arg) 752 { 753 struct usb_device *dev = ps->dev; 754 struct usbdevfs_bulktransfer bulk; 755 unsigned int tmo, len1, pipe; 756 int len2; 757 unsigned char *tbuf; 758 int i, j, ret; 759 760 if (copy_from_user(&bulk, arg, sizeof(bulk))) 761 return -EFAULT; 762 ret = findintfep(ps->dev, bulk.ep); 763 if (ret < 0) 764 return ret; 765 ret = checkintf(ps, ret); 766 if (ret) 767 return ret; 768 if (bulk.ep & USB_DIR_IN) 769 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f); 770 else 771 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f); 772 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN))) 773 return -EINVAL; 774 len1 = bulk.len; 775 if (len1 > MAX_USBFS_BUFFER_SIZE) 776 return -EINVAL; 777 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) 778 return -ENOMEM; 779 tmo = bulk.timeout; 780 if (bulk.ep & 0x80) { 781 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) { 782 kfree(tbuf); 783 return -EINVAL; 784 } 785 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n", 786 bulk.len, bulk.timeout); 787 usb_unlock_device(dev); 788 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 789 usb_lock_device(dev); 790 if (!i && len2) { 791 if (usbfs_snoop) { 792 dev_info(&dev->dev, "bulk read: data "); 793 for (j = 0; j < len2; ++j) 794 printk("%02x ", (u8)(tbuf)[j]); 795 printk("\n"); 796 } 797 if (copy_to_user(bulk.data, tbuf, len2)) { 798 kfree(tbuf); 799 return -EFAULT; 800 } 801 } 802 } else { 803 if (len1) { 804 if (copy_from_user(tbuf, bulk.data, len1)) { 805 kfree(tbuf); 806 return -EFAULT; 807 } 808 } 809 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n", 810 bulk.len, bulk.timeout); 811 if (usbfs_snoop) { 812 dev_info(&dev->dev, "bulk write: data: "); 813 for (j = 0; j < len1; ++j) 814 printk("%02x ", (unsigned char)(tbuf)[j]); 815 printk("\n"); 816 } 817 usb_unlock_device(dev); 818 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 819 usb_lock_device(dev); 820 } 821 kfree(tbuf); 822 if (i < 0) 823 return i; 824 return len2; 825 } 826 827 static int proc_resetep(struct dev_state *ps, void __user *arg) 828 { 829 unsigned int ep; 830 int ret; 831 832 if (get_user(ep, (unsigned int __user *)arg)) 833 return -EFAULT; 834 ret = findintfep(ps->dev, ep); 835 if (ret < 0) 836 return ret; 837 ret = checkintf(ps, ret); 838 if (ret) 839 return ret; 840 usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0); 841 return 0; 842 } 843 844 static int proc_clearhalt(struct dev_state *ps, void __user *arg) 845 { 846 unsigned int ep; 847 int pipe; 848 int ret; 849 850 if (get_user(ep, (unsigned int __user *)arg)) 851 return -EFAULT; 852 ret = findintfep(ps->dev, ep); 853 if (ret < 0) 854 return ret; 855 ret = checkintf(ps, ret); 856 if (ret) 857 return ret; 858 if (ep & USB_DIR_IN) 859 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f); 860 else 861 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f); 862 863 return usb_clear_halt(ps->dev, pipe); 864 } 865 866 static int proc_getdriver(struct dev_state *ps, void __user *arg) 867 { 868 struct usbdevfs_getdriver gd; 869 struct usb_interface *intf; 870 int ret; 871 872 if (copy_from_user(&gd, arg, sizeof(gd))) 873 return -EFAULT; 874 intf = usb_ifnum_to_if(ps->dev, gd.interface); 875 if (!intf || !intf->dev.driver) 876 ret = -ENODATA; 877 else { 878 strncpy(gd.driver, intf->dev.driver->name, 879 sizeof(gd.driver)); 880 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0); 881 } 882 return ret; 883 } 884 885 static int proc_connectinfo(struct dev_state *ps, void __user *arg) 886 { 887 struct usbdevfs_connectinfo ci; 888 889 ci.devnum = ps->dev->devnum; 890 ci.slow = ps->dev->speed == USB_SPEED_LOW; 891 if (copy_to_user(arg, &ci, sizeof(ci))) 892 return -EFAULT; 893 return 0; 894 } 895 896 static int proc_resetdevice(struct dev_state *ps) 897 { 898 return usb_reset_device(ps->dev); 899 } 900 901 static int proc_setintf(struct dev_state *ps, void __user *arg) 902 { 903 struct usbdevfs_setinterface setintf; 904 int ret; 905 906 if (copy_from_user(&setintf, arg, sizeof(setintf))) 907 return -EFAULT; 908 if ((ret = checkintf(ps, setintf.interface))) 909 return ret; 910 return usb_set_interface(ps->dev, setintf.interface, 911 setintf.altsetting); 912 } 913 914 static int proc_setconfig(struct dev_state *ps, void __user *arg) 915 { 916 int u; 917 int status = 0; 918 struct usb_host_config *actconfig; 919 920 if (get_user(u, (int __user *)arg)) 921 return -EFAULT; 922 923 actconfig = ps->dev->actconfig; 924 925 /* Don't touch the device if any interfaces are claimed. 926 * It could interfere with other drivers' operations, and if 927 * an interface is claimed by usbfs it could easily deadlock. 928 */ 929 if (actconfig) { 930 int i; 931 932 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) { 933 if (usb_interface_claimed(actconfig->interface[i])) { 934 dev_warn(&ps->dev->dev, 935 "usbfs: interface %d claimed by %s " 936 "while '%s' sets config #%d\n", 937 actconfig->interface[i] 938 ->cur_altsetting 939 ->desc.bInterfaceNumber, 940 actconfig->interface[i] 941 ->dev.driver->name, 942 current->comm, u); 943 status = -EBUSY; 944 break; 945 } 946 } 947 } 948 949 /* SET_CONFIGURATION is often abused as a "cheap" driver reset, 950 * so avoid usb_set_configuration()'s kick to sysfs 951 */ 952 if (status == 0) { 953 if (actconfig && actconfig->desc.bConfigurationValue == u) 954 status = usb_reset_configuration(ps->dev); 955 else 956 status = usb_set_configuration(ps->dev, u); 957 } 958 959 return status; 960 } 961 962 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb, 963 struct usbdevfs_iso_packet_desc __user *iso_frame_desc, 964 void __user *arg) 965 { 966 struct usbdevfs_iso_packet_desc *isopkt = NULL; 967 struct usb_host_endpoint *ep; 968 struct async *as; 969 struct usb_ctrlrequest *dr = NULL; 970 unsigned int u, totlen, isofrmlen; 971 int ret, ifnum = -1; 972 int is_in; 973 974 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP | 975 USBDEVFS_URB_SHORT_NOT_OK | 976 USBDEVFS_URB_NO_FSBR | 977 USBDEVFS_URB_ZERO_PACKET | 978 USBDEVFS_URB_NO_INTERRUPT)) 979 return -EINVAL; 980 if (!uurb->buffer) 981 return -EINVAL; 982 if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || 983 uurb->signr > SIGRTMAX)) 984 return -EINVAL; 985 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && 986 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) { 987 ifnum = findintfep(ps->dev, uurb->endpoint); 988 if (ifnum < 0) 989 return ifnum; 990 ret = checkintf(ps, ifnum); 991 if (ret) 992 return ret; 993 } 994 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) { 995 is_in = 1; 996 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 997 } else { 998 is_in = 0; 999 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 1000 } 1001 if (!ep) 1002 return -ENOENT; 1003 switch(uurb->type) { 1004 case USBDEVFS_URB_TYPE_CONTROL: 1005 if (!usb_endpoint_xfer_control(&ep->desc)) 1006 return -EINVAL; 1007 /* min 8 byte setup packet, 1008 * max 8 byte setup plus an arbitrary data stage */ 1009 if (uurb->buffer_length < 8 || 1010 uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE)) 1011 return -EINVAL; 1012 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); 1013 if (!dr) 1014 return -ENOMEM; 1015 if (copy_from_user(dr, uurb->buffer, 8)) { 1016 kfree(dr); 1017 return -EFAULT; 1018 } 1019 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) { 1020 kfree(dr); 1021 return -EINVAL; 1022 } 1023 ret = check_ctrlrecip(ps, dr->bRequestType, 1024 le16_to_cpup(&dr->wIndex)); 1025 if (ret) { 1026 kfree(dr); 1027 return ret; 1028 } 1029 uurb->number_of_packets = 0; 1030 uurb->buffer_length = le16_to_cpup(&dr->wLength); 1031 uurb->buffer += 8; 1032 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) { 1033 is_in = 1; 1034 uurb->endpoint |= USB_DIR_IN; 1035 } else { 1036 is_in = 0; 1037 uurb->endpoint &= ~USB_DIR_IN; 1038 } 1039 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ, 1040 uurb->buffer, uurb->buffer_length)) { 1041 kfree(dr); 1042 return -EFAULT; 1043 } 1044 snoop(&ps->dev->dev, "control urb: bRequest=%02x " 1045 "bRrequestType=%02x wValue=%04x " 1046 "wIndex=%04x wLength=%04x\n", 1047 dr->bRequest, dr->bRequestType, 1048 __le16_to_cpup(&dr->wValue), 1049 __le16_to_cpup(&dr->wIndex), 1050 __le16_to_cpup(&dr->wLength)); 1051 break; 1052 1053 case USBDEVFS_URB_TYPE_BULK: 1054 switch (usb_endpoint_type(&ep->desc)) { 1055 case USB_ENDPOINT_XFER_CONTROL: 1056 case USB_ENDPOINT_XFER_ISOC: 1057 return -EINVAL; 1058 /* allow single-shot interrupt transfers, at bogus rates */ 1059 } 1060 uurb->number_of_packets = 0; 1061 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE) 1062 return -EINVAL; 1063 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ, 1064 uurb->buffer, uurb->buffer_length)) 1065 return -EFAULT; 1066 snoop(&ps->dev->dev, "bulk urb\n"); 1067 break; 1068 1069 case USBDEVFS_URB_TYPE_ISO: 1070 /* arbitrary limit */ 1071 if (uurb->number_of_packets < 1 || 1072 uurb->number_of_packets > 128) 1073 return -EINVAL; 1074 if (!usb_endpoint_xfer_isoc(&ep->desc)) 1075 return -EINVAL; 1076 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * 1077 uurb->number_of_packets; 1078 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL))) 1079 return -ENOMEM; 1080 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) { 1081 kfree(isopkt); 1082 return -EFAULT; 1083 } 1084 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1085 /* arbitrary limit, 1086 * sufficient for USB 2.0 high-bandwidth iso */ 1087 if (isopkt[u].length > 8192) { 1088 kfree(isopkt); 1089 return -EINVAL; 1090 } 1091 totlen += isopkt[u].length; 1092 } 1093 if (totlen > 32768) { 1094 kfree(isopkt); 1095 return -EINVAL; 1096 } 1097 uurb->buffer_length = totlen; 1098 snoop(&ps->dev->dev, "iso urb\n"); 1099 break; 1100 1101 case USBDEVFS_URB_TYPE_INTERRUPT: 1102 uurb->number_of_packets = 0; 1103 if (!usb_endpoint_xfer_int(&ep->desc)) 1104 return -EINVAL; 1105 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE) 1106 return -EINVAL; 1107 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ, 1108 uurb->buffer, uurb->buffer_length)) 1109 return -EFAULT; 1110 snoop(&ps->dev->dev, "interrupt urb\n"); 1111 break; 1112 1113 default: 1114 return -EINVAL; 1115 } 1116 as = alloc_async(uurb->number_of_packets); 1117 if (!as) { 1118 kfree(isopkt); 1119 kfree(dr); 1120 return -ENOMEM; 1121 } 1122 as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL); 1123 if (!as->urb->transfer_buffer) { 1124 kfree(isopkt); 1125 kfree(dr); 1126 free_async(as); 1127 return -ENOMEM; 1128 } 1129 as->urb->dev = ps->dev; 1130 as->urb->pipe = (uurb->type << 30) | 1131 __create_pipe(ps->dev, uurb->endpoint & 0xf) | 1132 (uurb->endpoint & USB_DIR_IN); 1133 1134 /* This tedious sequence is necessary because the URB_* flags 1135 * are internal to the kernel and subject to change, whereas 1136 * the USBDEVFS_URB_* flags are a user API and must not be changed. 1137 */ 1138 u = (is_in ? URB_DIR_IN : URB_DIR_OUT); 1139 if (uurb->flags & USBDEVFS_URB_ISO_ASAP) 1140 u |= URB_ISO_ASAP; 1141 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK) 1142 u |= URB_SHORT_NOT_OK; 1143 if (uurb->flags & USBDEVFS_URB_NO_FSBR) 1144 u |= URB_NO_FSBR; 1145 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET) 1146 u |= URB_ZERO_PACKET; 1147 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT) 1148 u |= URB_NO_INTERRUPT; 1149 as->urb->transfer_flags = u; 1150 1151 as->urb->transfer_buffer_length = uurb->buffer_length; 1152 as->urb->setup_packet = (unsigned char *)dr; 1153 as->urb->start_frame = uurb->start_frame; 1154 as->urb->number_of_packets = uurb->number_of_packets; 1155 if (uurb->type == USBDEVFS_URB_TYPE_ISO || 1156 ps->dev->speed == USB_SPEED_HIGH) 1157 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1); 1158 else 1159 as->urb->interval = ep->desc.bInterval; 1160 as->urb->context = as; 1161 as->urb->complete = async_completed; 1162 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1163 as->urb->iso_frame_desc[u].offset = totlen; 1164 as->urb->iso_frame_desc[u].length = isopkt[u].length; 1165 totlen += isopkt[u].length; 1166 } 1167 kfree(isopkt); 1168 as->ps = ps; 1169 as->userurb = arg; 1170 if (uurb->endpoint & USB_DIR_IN) 1171 as->userbuffer = uurb->buffer; 1172 else 1173 as->userbuffer = NULL; 1174 as->signr = uurb->signr; 1175 as->ifnum = ifnum; 1176 as->pid = get_pid(task_pid(current)); 1177 as->uid = current->uid; 1178 as->euid = current->euid; 1179 security_task_getsecid(current, &as->secid); 1180 if (!is_in) { 1181 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, 1182 as->urb->transfer_buffer_length)) { 1183 free_async(as); 1184 return -EFAULT; 1185 } 1186 } 1187 snoop_urb(as->urb, as->userurb); 1188 async_newpending(as); 1189 if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) { 1190 dev_printk(KERN_DEBUG, &ps->dev->dev, 1191 "usbfs: usb_submit_urb returned %d\n", ret); 1192 async_removepending(as); 1193 free_async(as); 1194 return ret; 1195 } 1196 return 0; 1197 } 1198 1199 static int proc_submiturb(struct dev_state *ps, void __user *arg) 1200 { 1201 struct usbdevfs_urb uurb; 1202 1203 if (copy_from_user(&uurb, arg, sizeof(uurb))) 1204 return -EFAULT; 1205 1206 return proc_do_submiturb(ps, &uurb, 1207 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), 1208 arg); 1209 } 1210 1211 static int proc_unlinkurb(struct dev_state *ps, void __user *arg) 1212 { 1213 struct async *as; 1214 1215 as = async_getpending(ps, arg); 1216 if (!as) 1217 return -EINVAL; 1218 usb_kill_urb(as->urb); 1219 return 0; 1220 } 1221 1222 static int processcompl(struct async *as, void __user * __user *arg) 1223 { 1224 struct urb *urb = as->urb; 1225 struct usbdevfs_urb __user *userurb = as->userurb; 1226 void __user *addr = as->userurb; 1227 unsigned int i; 1228 1229 if (as->userbuffer) 1230 if (copy_to_user(as->userbuffer, urb->transfer_buffer, 1231 urb->transfer_buffer_length)) 1232 return -EFAULT; 1233 if (put_user(as->status, &userurb->status)) 1234 return -EFAULT; 1235 if (put_user(urb->actual_length, &userurb->actual_length)) 1236 return -EFAULT; 1237 if (put_user(urb->error_count, &userurb->error_count)) 1238 return -EFAULT; 1239 1240 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 1241 for (i = 0; i < urb->number_of_packets; i++) { 1242 if (put_user(urb->iso_frame_desc[i].actual_length, 1243 &userurb->iso_frame_desc[i].actual_length)) 1244 return -EFAULT; 1245 if (put_user(urb->iso_frame_desc[i].status, 1246 &userurb->iso_frame_desc[i].status)) 1247 return -EFAULT; 1248 } 1249 } 1250 1251 free_async(as); 1252 1253 if (put_user(addr, (void __user * __user *)arg)) 1254 return -EFAULT; 1255 return 0; 1256 } 1257 1258 static struct async *reap_as(struct dev_state *ps) 1259 { 1260 DECLARE_WAITQUEUE(wait, current); 1261 struct async *as = NULL; 1262 struct usb_device *dev = ps->dev; 1263 1264 add_wait_queue(&ps->wait, &wait); 1265 for (;;) { 1266 __set_current_state(TASK_INTERRUPTIBLE); 1267 as = async_getcompleted(ps); 1268 if (as) 1269 break; 1270 if (signal_pending(current)) 1271 break; 1272 usb_unlock_device(dev); 1273 schedule(); 1274 usb_lock_device(dev); 1275 } 1276 remove_wait_queue(&ps->wait, &wait); 1277 set_current_state(TASK_RUNNING); 1278 return as; 1279 } 1280 1281 static int proc_reapurb(struct dev_state *ps, void __user *arg) 1282 { 1283 struct async *as = reap_as(ps); 1284 if (as) 1285 return processcompl(as, (void __user * __user *)arg); 1286 if (signal_pending(current)) 1287 return -EINTR; 1288 return -EIO; 1289 } 1290 1291 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg) 1292 { 1293 struct async *as; 1294 1295 if (!(as = async_getcompleted(ps))) 1296 return -EAGAIN; 1297 return processcompl(as, (void __user * __user *)arg); 1298 } 1299 1300 #ifdef CONFIG_COMPAT 1301 1302 static int get_urb32(struct usbdevfs_urb *kurb, 1303 struct usbdevfs_urb32 __user *uurb) 1304 { 1305 __u32 uptr; 1306 if (get_user(kurb->type, &uurb->type) || 1307 __get_user(kurb->endpoint, &uurb->endpoint) || 1308 __get_user(kurb->status, &uurb->status) || 1309 __get_user(kurb->flags, &uurb->flags) || 1310 __get_user(kurb->buffer_length, &uurb->buffer_length) || 1311 __get_user(kurb->actual_length, &uurb->actual_length) || 1312 __get_user(kurb->start_frame, &uurb->start_frame) || 1313 __get_user(kurb->number_of_packets, &uurb->number_of_packets) || 1314 __get_user(kurb->error_count, &uurb->error_count) || 1315 __get_user(kurb->signr, &uurb->signr)) 1316 return -EFAULT; 1317 1318 if (__get_user(uptr, &uurb->buffer)) 1319 return -EFAULT; 1320 kurb->buffer = compat_ptr(uptr); 1321 if (__get_user(uptr, &uurb->buffer)) 1322 return -EFAULT; 1323 kurb->usercontext = compat_ptr(uptr); 1324 1325 return 0; 1326 } 1327 1328 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg) 1329 { 1330 struct usbdevfs_urb uurb; 1331 1332 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg)) 1333 return -EFAULT; 1334 1335 return proc_do_submiturb(ps, &uurb, 1336 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, 1337 arg); 1338 } 1339 1340 static int processcompl_compat(struct async *as, void __user * __user *arg) 1341 { 1342 struct urb *urb = as->urb; 1343 struct usbdevfs_urb32 __user *userurb = as->userurb; 1344 void __user *addr = as->userurb; 1345 unsigned int i; 1346 1347 if (as->userbuffer) 1348 if (copy_to_user(as->userbuffer, urb->transfer_buffer, 1349 urb->transfer_buffer_length)) 1350 return -EFAULT; 1351 if (put_user(as->status, &userurb->status)) 1352 return -EFAULT; 1353 if (put_user(urb->actual_length, &userurb->actual_length)) 1354 return -EFAULT; 1355 if (put_user(urb->error_count, &userurb->error_count)) 1356 return -EFAULT; 1357 1358 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 1359 for (i = 0; i < urb->number_of_packets; i++) { 1360 if (put_user(urb->iso_frame_desc[i].actual_length, 1361 &userurb->iso_frame_desc[i].actual_length)) 1362 return -EFAULT; 1363 if (put_user(urb->iso_frame_desc[i].status, 1364 &userurb->iso_frame_desc[i].status)) 1365 return -EFAULT; 1366 } 1367 } 1368 1369 free_async(as); 1370 if (put_user(ptr_to_compat(addr), (u32 __user *)arg)) 1371 return -EFAULT; 1372 return 0; 1373 } 1374 1375 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg) 1376 { 1377 struct async *as = reap_as(ps); 1378 if (as) 1379 return processcompl_compat(as, (void __user * __user *)arg); 1380 if (signal_pending(current)) 1381 return -EINTR; 1382 return -EIO; 1383 } 1384 1385 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg) 1386 { 1387 struct async *as; 1388 1389 if (!(as = async_getcompleted(ps))) 1390 return -EAGAIN; 1391 return processcompl_compat(as, (void __user * __user *)arg); 1392 } 1393 1394 #endif 1395 1396 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg) 1397 { 1398 struct usbdevfs_disconnectsignal ds; 1399 1400 if (copy_from_user(&ds, arg, sizeof(ds))) 1401 return -EFAULT; 1402 if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX)) 1403 return -EINVAL; 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 void usb_fs_classdev_common_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 usb_fs_classdev_common_remove(dev); 1749 } 1750 1751 static int usb_classdev_notify(struct notifier_block *self, 1752 unsigned long action, void *dev) 1753 { 1754 switch (action) { 1755 case USB_DEVICE_ADD: 1756 if (usb_classdev_add(dev)) 1757 return NOTIFY_BAD; 1758 break; 1759 case USB_DEVICE_REMOVE: 1760 usb_classdev_remove(dev); 1761 break; 1762 } 1763 return NOTIFY_OK; 1764 } 1765 1766 static struct notifier_block usbdev_nb = { 1767 .notifier_call = usb_classdev_notify, 1768 }; 1769 #endif 1770 1771 static struct cdev usb_device_cdev; 1772 1773 int __init usb_devio_init(void) 1774 { 1775 int retval; 1776 1777 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX, 1778 "usb_device"); 1779 if (retval) { 1780 printk(KERN_ERR "Unable to register minors for usb_device\n"); 1781 goto out; 1782 } 1783 cdev_init(&usb_device_cdev, &usbdev_file_operations); 1784 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX); 1785 if (retval) { 1786 printk(KERN_ERR "Unable to get usb_device major %d\n", 1787 USB_DEVICE_MAJOR); 1788 goto error_cdev; 1789 } 1790 #ifdef CONFIG_USB_DEVICE_CLASS 1791 usb_classdev_class = class_create(THIS_MODULE, "usb_device"); 1792 if (IS_ERR(usb_classdev_class)) { 1793 printk(KERN_ERR "Unable to register usb_device class\n"); 1794 retval = PTR_ERR(usb_classdev_class); 1795 cdev_del(&usb_device_cdev); 1796 usb_classdev_class = NULL; 1797 goto out; 1798 } 1799 /* devices of this class shadow the major:minor of their parent 1800 * device, so clear ->dev_kobj to prevent adding duplicate entries 1801 * to /sys/dev 1802 */ 1803 usb_classdev_class->dev_kobj = NULL; 1804 1805 usb_register_notify(&usbdev_nb); 1806 #endif 1807 out: 1808 return retval; 1809 1810 error_cdev: 1811 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 1812 goto out; 1813 } 1814 1815 void usb_devio_cleanup(void) 1816 { 1817 #ifdef CONFIG_USB_DEVICE_CLASS 1818 usb_unregister_notify(&usbdev_nb); 1819 class_destroy(usb_classdev_class); 1820 #endif 1821 cdev_del(&usb_device_cdev); 1822 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 1823 } 1824