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 warn("interface number %u out of range", ifnum); 417 418 usb_set_intfdata(intf, NULL); 419 420 /* force async requests to complete */ 421 destroy_async_on_interface(ps, ifnum); 422 } 423 424 /* The following routines are merely placeholders. There is no way 425 * to inform a user task about suspend or resumes. 426 */ 427 static int driver_suspend(struct usb_interface *intf, pm_message_t msg) 428 { 429 return 0; 430 } 431 432 static int driver_resume(struct usb_interface *intf) 433 { 434 return 0; 435 } 436 437 struct usb_driver usbfs_driver = { 438 .name = "usbfs", 439 .probe = driver_probe, 440 .disconnect = driver_disconnect, 441 .suspend = driver_suspend, 442 .resume = driver_resume, 443 }; 444 445 static int claimintf(struct dev_state *ps, unsigned int ifnum) 446 { 447 struct usb_device *dev = ps->dev; 448 struct usb_interface *intf; 449 int err; 450 451 if (ifnum >= 8*sizeof(ps->ifclaimed)) 452 return -EINVAL; 453 /* already claimed */ 454 if (test_bit(ifnum, &ps->ifclaimed)) 455 return 0; 456 457 intf = usb_ifnum_to_if(dev, ifnum); 458 if (!intf) 459 err = -ENOENT; 460 else 461 err = usb_driver_claim_interface(&usbfs_driver, intf, ps); 462 if (err == 0) 463 set_bit(ifnum, &ps->ifclaimed); 464 return err; 465 } 466 467 static int releaseintf(struct dev_state *ps, unsigned int ifnum) 468 { 469 struct usb_device *dev; 470 struct usb_interface *intf; 471 int err; 472 473 err = -EINVAL; 474 if (ifnum >= 8*sizeof(ps->ifclaimed)) 475 return err; 476 dev = ps->dev; 477 intf = usb_ifnum_to_if(dev, ifnum); 478 if (!intf) 479 err = -ENOENT; 480 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) { 481 usb_driver_release_interface(&usbfs_driver, intf); 482 err = 0; 483 } 484 return err; 485 } 486 487 static int checkintf(struct dev_state *ps, unsigned int ifnum) 488 { 489 if (ps->dev->state != USB_STATE_CONFIGURED) 490 return -EHOSTUNREACH; 491 if (ifnum >= 8*sizeof(ps->ifclaimed)) 492 return -EINVAL; 493 if (test_bit(ifnum, &ps->ifclaimed)) 494 return 0; 495 /* if not yet claimed, claim it for the driver */ 496 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim " 497 "interface %u before use\n", task_pid_nr(current), 498 current->comm, ifnum); 499 return claimintf(ps, ifnum); 500 } 501 502 static int findintfep(struct usb_device *dev, unsigned int ep) 503 { 504 unsigned int i, j, e; 505 struct usb_interface *intf; 506 struct usb_host_interface *alts; 507 struct usb_endpoint_descriptor *endpt; 508 509 if (ep & ~(USB_DIR_IN|0xf)) 510 return -EINVAL; 511 if (!dev->actconfig) 512 return -ESRCH; 513 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { 514 intf = dev->actconfig->interface[i]; 515 for (j = 0; j < intf->num_altsetting; j++) { 516 alts = &intf->altsetting[j]; 517 for (e = 0; e < alts->desc.bNumEndpoints; e++) { 518 endpt = &alts->endpoint[e].desc; 519 if (endpt->bEndpointAddress == ep) 520 return alts->desc.bInterfaceNumber; 521 } 522 } 523 } 524 return -ENOENT; 525 } 526 527 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, 528 unsigned int index) 529 { 530 int ret = 0; 531 532 if (ps->dev->state != USB_STATE_ADDRESS 533 && ps->dev->state != USB_STATE_CONFIGURED) 534 return -EHOSTUNREACH; 535 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype)) 536 return 0; 537 538 index &= 0xff; 539 switch (requesttype & USB_RECIP_MASK) { 540 case USB_RECIP_ENDPOINT: 541 ret = findintfep(ps->dev, index); 542 if (ret >= 0) 543 ret = checkintf(ps, ret); 544 break; 545 546 case USB_RECIP_INTERFACE: 547 ret = checkintf(ps, index); 548 break; 549 } 550 return ret; 551 } 552 553 static int match_devt(struct device *dev, void *data) 554 { 555 return dev->devt == (dev_t) (unsigned long) data; 556 } 557 558 static struct usb_device *usbdev_lookup_by_devt(dev_t devt) 559 { 560 struct device *dev; 561 562 dev = bus_find_device(&usb_bus_type, NULL, 563 (void *) (unsigned long) devt, match_devt); 564 if (!dev) 565 return NULL; 566 return container_of(dev, struct usb_device, dev); 567 } 568 569 /* 570 * file operations 571 */ 572 static int usbdev_open(struct inode *inode, struct file *file) 573 { 574 struct usb_device *dev = NULL; 575 struct dev_state *ps; 576 int ret; 577 578 lock_kernel(); 579 /* Protect against simultaneous removal or release */ 580 mutex_lock(&usbfs_mutex); 581 582 ret = -ENOMEM; 583 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL); 584 if (!ps) 585 goto out; 586 587 ret = -ENOENT; 588 589 /* usbdev device-node */ 590 if (imajor(inode) == USB_DEVICE_MAJOR) 591 dev = usbdev_lookup_by_devt(inode->i_rdev); 592 #ifdef CONFIG_USB_DEVICEFS 593 /* procfs file */ 594 if (!dev) { 595 dev = inode->i_private; 596 if (dev && dev->usbfs_dentry && 597 dev->usbfs_dentry->d_inode == inode) 598 usb_get_dev(dev); 599 else 600 dev = NULL; 601 } 602 #endif 603 if (!dev || dev->state == USB_STATE_NOTATTACHED) 604 goto out; 605 ret = usb_autoresume_device(dev); 606 if (ret) 607 goto out; 608 609 ret = 0; 610 ps->dev = dev; 611 ps->file = file; 612 spin_lock_init(&ps->lock); 613 INIT_LIST_HEAD(&ps->list); 614 INIT_LIST_HEAD(&ps->async_pending); 615 INIT_LIST_HEAD(&ps->async_completed); 616 init_waitqueue_head(&ps->wait); 617 ps->discsignr = 0; 618 ps->disc_pid = get_pid(task_pid(current)); 619 ps->disc_uid = current->uid; 620 ps->disc_euid = current->euid; 621 ps->disccontext = NULL; 622 ps->ifclaimed = 0; 623 security_task_getsecid(current, &ps->secid); 624 smp_wmb(); 625 list_add_tail(&ps->list, &dev->filelist); 626 file->private_data = ps; 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; 642 643 usb_lock_device(dev); 644 645 /* Protect against simultaneous open */ 646 mutex_lock(&usbfs_mutex); 647 list_del_init(&ps->list); 648 mutex_unlock(&usbfs_mutex); 649 650 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed); 651 ifnum++) { 652 if (test_bit(ifnum, &ps->ifclaimed)) 653 releaseintf(ps, ifnum); 654 } 655 destroy_all_async(ps); 656 usb_autosuspend_device(dev); 657 usb_unlock_device(dev); 658 usb_put_dev(dev); 659 put_pid(ps->disc_pid); 660 kfree(ps); 661 return 0; 662 } 663 664 static int proc_control(struct dev_state *ps, void __user *arg) 665 { 666 struct usb_device *dev = ps->dev; 667 struct usbdevfs_ctrltransfer ctrl; 668 unsigned int tmo; 669 unsigned char *tbuf; 670 unsigned wLength; 671 int i, j, ret; 672 673 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 674 return -EFAULT; 675 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex); 676 if (ret) 677 return ret; 678 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */ 679 if (wLength > PAGE_SIZE) 680 return -EINVAL; 681 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL); 682 if (!tbuf) 683 return -ENOMEM; 684 tmo = ctrl.timeout; 685 if (ctrl.bRequestType & 0x80) { 686 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, 687 ctrl.wLength)) { 688 free_page((unsigned long)tbuf); 689 return -EINVAL; 690 } 691 snoop(&dev->dev, "control read: bRequest=%02x " 692 "bRrequestType=%02x wValue=%04x " 693 "wIndex=%04x wLength=%04x\n", 694 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, 695 ctrl.wIndex, ctrl.wLength); 696 697 usb_unlock_device(dev); 698 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, 699 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 700 tbuf, ctrl.wLength, tmo); 701 usb_lock_device(dev); 702 if ((i > 0) && ctrl.wLength) { 703 if (usbfs_snoop) { 704 dev_info(&dev->dev, "control read: data "); 705 for (j = 0; j < i; ++j) 706 printk("%02x ", (u8)(tbuf)[j]); 707 printk("\n"); 708 } 709 if (copy_to_user(ctrl.data, tbuf, i)) { 710 free_page((unsigned long)tbuf); 711 return -EFAULT; 712 } 713 } 714 } else { 715 if (ctrl.wLength) { 716 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) { 717 free_page((unsigned long)tbuf); 718 return -EFAULT; 719 } 720 } 721 snoop(&dev->dev, "control write: bRequest=%02x " 722 "bRrequestType=%02x wValue=%04x " 723 "wIndex=%04x wLength=%04x\n", 724 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, 725 ctrl.wIndex, ctrl.wLength); 726 if (usbfs_snoop) { 727 dev_info(&dev->dev, "control write: data: "); 728 for (j = 0; j < ctrl.wLength; ++j) 729 printk("%02x ", (unsigned char)(tbuf)[j]); 730 printk("\n"); 731 } 732 usb_unlock_device(dev); 733 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, 734 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 735 tbuf, ctrl.wLength, tmo); 736 usb_lock_device(dev); 737 } 738 free_page((unsigned long)tbuf); 739 if (i < 0 && i != -EPIPE) { 740 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL " 741 "failed cmd %s rqt %u rq %u len %u ret %d\n", 742 current->comm, ctrl.bRequestType, ctrl.bRequest, 743 ctrl.wLength, i); 744 } 745 return i; 746 } 747 748 static int proc_bulk(struct dev_state *ps, void __user *arg) 749 { 750 struct usb_device *dev = ps->dev; 751 struct usbdevfs_bulktransfer bulk; 752 unsigned int tmo, len1, pipe; 753 int len2; 754 unsigned char *tbuf; 755 int i, j, ret; 756 757 if (copy_from_user(&bulk, arg, sizeof(bulk))) 758 return -EFAULT; 759 ret = findintfep(ps->dev, bulk.ep); 760 if (ret < 0) 761 return ret; 762 ret = checkintf(ps, ret); 763 if (ret) 764 return ret; 765 if (bulk.ep & USB_DIR_IN) 766 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f); 767 else 768 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f); 769 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN))) 770 return -EINVAL; 771 len1 = bulk.len; 772 if (len1 > MAX_USBFS_BUFFER_SIZE) 773 return -EINVAL; 774 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) 775 return -ENOMEM; 776 tmo = bulk.timeout; 777 if (bulk.ep & 0x80) { 778 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) { 779 kfree(tbuf); 780 return -EINVAL; 781 } 782 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n", 783 bulk.len, bulk.timeout); 784 usb_unlock_device(dev); 785 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 786 usb_lock_device(dev); 787 if (!i && len2) { 788 if (usbfs_snoop) { 789 dev_info(&dev->dev, "bulk read: data "); 790 for (j = 0; j < len2; ++j) 791 printk("%02x ", (u8)(tbuf)[j]); 792 printk("\n"); 793 } 794 if (copy_to_user(bulk.data, tbuf, len2)) { 795 kfree(tbuf); 796 return -EFAULT; 797 } 798 } 799 } else { 800 if (len1) { 801 if (copy_from_user(tbuf, bulk.data, len1)) { 802 kfree(tbuf); 803 return -EFAULT; 804 } 805 } 806 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n", 807 bulk.len, bulk.timeout); 808 if (usbfs_snoop) { 809 dev_info(&dev->dev, "bulk write: data: "); 810 for (j = 0; j < len1; ++j) 811 printk("%02x ", (unsigned char)(tbuf)[j]); 812 printk("\n"); 813 } 814 usb_unlock_device(dev); 815 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 816 usb_lock_device(dev); 817 } 818 kfree(tbuf); 819 if (i < 0) 820 return i; 821 return len2; 822 } 823 824 static int proc_resetep(struct dev_state *ps, void __user *arg) 825 { 826 unsigned int ep; 827 int ret; 828 829 if (get_user(ep, (unsigned int __user *)arg)) 830 return -EFAULT; 831 ret = findintfep(ps->dev, ep); 832 if (ret < 0) 833 return ret; 834 ret = checkintf(ps, ret); 835 if (ret) 836 return ret; 837 usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0); 838 return 0; 839 } 840 841 static int proc_clearhalt(struct dev_state *ps, void __user *arg) 842 { 843 unsigned int ep; 844 int pipe; 845 int ret; 846 847 if (get_user(ep, (unsigned int __user *)arg)) 848 return -EFAULT; 849 ret = findintfep(ps->dev, ep); 850 if (ret < 0) 851 return ret; 852 ret = checkintf(ps, ret); 853 if (ret) 854 return ret; 855 if (ep & USB_DIR_IN) 856 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f); 857 else 858 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f); 859 860 return usb_clear_halt(ps->dev, pipe); 861 } 862 863 static int proc_getdriver(struct dev_state *ps, void __user *arg) 864 { 865 struct usbdevfs_getdriver gd; 866 struct usb_interface *intf; 867 int ret; 868 869 if (copy_from_user(&gd, arg, sizeof(gd))) 870 return -EFAULT; 871 intf = usb_ifnum_to_if(ps->dev, gd.interface); 872 if (!intf || !intf->dev.driver) 873 ret = -ENODATA; 874 else { 875 strncpy(gd.driver, intf->dev.driver->name, 876 sizeof(gd.driver)); 877 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0); 878 } 879 return ret; 880 } 881 882 static int proc_connectinfo(struct dev_state *ps, void __user *arg) 883 { 884 struct usbdevfs_connectinfo ci; 885 886 ci.devnum = ps->dev->devnum; 887 ci.slow = ps->dev->speed == USB_SPEED_LOW; 888 if (copy_to_user(arg, &ci, sizeof(ci))) 889 return -EFAULT; 890 return 0; 891 } 892 893 static int proc_resetdevice(struct dev_state *ps) 894 { 895 return usb_reset_device(ps->dev); 896 } 897 898 static int proc_setintf(struct dev_state *ps, void __user *arg) 899 { 900 struct usbdevfs_setinterface setintf; 901 int ret; 902 903 if (copy_from_user(&setintf, arg, sizeof(setintf))) 904 return -EFAULT; 905 if ((ret = checkintf(ps, setintf.interface))) 906 return ret; 907 return usb_set_interface(ps->dev, setintf.interface, 908 setintf.altsetting); 909 } 910 911 static int proc_setconfig(struct dev_state *ps, void __user *arg) 912 { 913 int u; 914 int status = 0; 915 struct usb_host_config *actconfig; 916 917 if (get_user(u, (int __user *)arg)) 918 return -EFAULT; 919 920 actconfig = ps->dev->actconfig; 921 922 /* Don't touch the device if any interfaces are claimed. 923 * It could interfere with other drivers' operations, and if 924 * an interface is claimed by usbfs it could easily deadlock. 925 */ 926 if (actconfig) { 927 int i; 928 929 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) { 930 if (usb_interface_claimed(actconfig->interface[i])) { 931 dev_warn(&ps->dev->dev, 932 "usbfs: interface %d claimed by %s " 933 "while '%s' sets config #%d\n", 934 actconfig->interface[i] 935 ->cur_altsetting 936 ->desc.bInterfaceNumber, 937 actconfig->interface[i] 938 ->dev.driver->name, 939 current->comm, u); 940 status = -EBUSY; 941 break; 942 } 943 } 944 } 945 946 /* SET_CONFIGURATION is often abused as a "cheap" driver reset, 947 * so avoid usb_set_configuration()'s kick to sysfs 948 */ 949 if (status == 0) { 950 if (actconfig && actconfig->desc.bConfigurationValue == u) 951 status = usb_reset_configuration(ps->dev); 952 else 953 status = usb_set_configuration(ps->dev, u); 954 } 955 956 return status; 957 } 958 959 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb, 960 struct usbdevfs_iso_packet_desc __user *iso_frame_desc, 961 void __user *arg) 962 { 963 struct usbdevfs_iso_packet_desc *isopkt = NULL; 964 struct usb_host_endpoint *ep; 965 struct async *as; 966 struct usb_ctrlrequest *dr = NULL; 967 unsigned int u, totlen, isofrmlen; 968 int ret, ifnum = -1; 969 int is_in; 970 971 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP | 972 USBDEVFS_URB_SHORT_NOT_OK | 973 USBDEVFS_URB_NO_FSBR | 974 USBDEVFS_URB_ZERO_PACKET | 975 USBDEVFS_URB_NO_INTERRUPT)) 976 return -EINVAL; 977 if (!uurb->buffer) 978 return -EINVAL; 979 if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || 980 uurb->signr > SIGRTMAX)) 981 return -EINVAL; 982 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && 983 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) { 984 ifnum = findintfep(ps->dev, uurb->endpoint); 985 if (ifnum < 0) 986 return ifnum; 987 ret = checkintf(ps, ifnum); 988 if (ret) 989 return ret; 990 } 991 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) { 992 is_in = 1; 993 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 994 } else { 995 is_in = 0; 996 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 997 } 998 if (!ep) 999 return -ENOENT; 1000 switch(uurb->type) { 1001 case USBDEVFS_URB_TYPE_CONTROL: 1002 if (!usb_endpoint_xfer_control(&ep->desc)) 1003 return -EINVAL; 1004 /* min 8 byte setup packet, 1005 * max 8 byte setup plus an arbitrary data stage */ 1006 if (uurb->buffer_length < 8 || 1007 uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE)) 1008 return -EINVAL; 1009 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); 1010 if (!dr) 1011 return -ENOMEM; 1012 if (copy_from_user(dr, uurb->buffer, 8)) { 1013 kfree(dr); 1014 return -EFAULT; 1015 } 1016 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) { 1017 kfree(dr); 1018 return -EINVAL; 1019 } 1020 ret = check_ctrlrecip(ps, dr->bRequestType, 1021 le16_to_cpup(&dr->wIndex)); 1022 if (ret) { 1023 kfree(dr); 1024 return ret; 1025 } 1026 uurb->number_of_packets = 0; 1027 uurb->buffer_length = le16_to_cpup(&dr->wLength); 1028 uurb->buffer += 8; 1029 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) { 1030 is_in = 1; 1031 uurb->endpoint |= USB_DIR_IN; 1032 } else { 1033 is_in = 0; 1034 uurb->endpoint &= ~USB_DIR_IN; 1035 } 1036 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ, 1037 uurb->buffer, uurb->buffer_length)) { 1038 kfree(dr); 1039 return -EFAULT; 1040 } 1041 snoop(&ps->dev->dev, "control urb: bRequest=%02x " 1042 "bRrequestType=%02x wValue=%04x " 1043 "wIndex=%04x wLength=%04x\n", 1044 dr->bRequest, dr->bRequestType, 1045 __le16_to_cpup(&dr->wValue), 1046 __le16_to_cpup(&dr->wIndex), 1047 __le16_to_cpup(&dr->wLength)); 1048 break; 1049 1050 case USBDEVFS_URB_TYPE_BULK: 1051 switch (usb_endpoint_type(&ep->desc)) { 1052 case USB_ENDPOINT_XFER_CONTROL: 1053 case USB_ENDPOINT_XFER_ISOC: 1054 return -EINVAL; 1055 /* allow single-shot interrupt transfers, at bogus rates */ 1056 } 1057 uurb->number_of_packets = 0; 1058 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE) 1059 return -EINVAL; 1060 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ, 1061 uurb->buffer, uurb->buffer_length)) 1062 return -EFAULT; 1063 snoop(&ps->dev->dev, "bulk urb\n"); 1064 break; 1065 1066 case USBDEVFS_URB_TYPE_ISO: 1067 /* arbitrary limit */ 1068 if (uurb->number_of_packets < 1 || 1069 uurb->number_of_packets > 128) 1070 return -EINVAL; 1071 if (!usb_endpoint_xfer_isoc(&ep->desc)) 1072 return -EINVAL; 1073 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * 1074 uurb->number_of_packets; 1075 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL))) 1076 return -ENOMEM; 1077 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) { 1078 kfree(isopkt); 1079 return -EFAULT; 1080 } 1081 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1082 /* arbitrary limit, 1083 * sufficient for USB 2.0 high-bandwidth iso */ 1084 if (isopkt[u].length > 8192) { 1085 kfree(isopkt); 1086 return -EINVAL; 1087 } 1088 totlen += isopkt[u].length; 1089 } 1090 if (totlen > 32768) { 1091 kfree(isopkt); 1092 return -EINVAL; 1093 } 1094 uurb->buffer_length = totlen; 1095 snoop(&ps->dev->dev, "iso urb\n"); 1096 break; 1097 1098 case USBDEVFS_URB_TYPE_INTERRUPT: 1099 uurb->number_of_packets = 0; 1100 if (!usb_endpoint_xfer_int(&ep->desc)) 1101 return -EINVAL; 1102 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE) 1103 return -EINVAL; 1104 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ, 1105 uurb->buffer, uurb->buffer_length)) 1106 return -EFAULT; 1107 snoop(&ps->dev->dev, "interrupt urb\n"); 1108 break; 1109 1110 default: 1111 return -EINVAL; 1112 } 1113 as = alloc_async(uurb->number_of_packets); 1114 if (!as) { 1115 kfree(isopkt); 1116 kfree(dr); 1117 return -ENOMEM; 1118 } 1119 as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL); 1120 if (!as->urb->transfer_buffer) { 1121 kfree(isopkt); 1122 kfree(dr); 1123 free_async(as); 1124 return -ENOMEM; 1125 } 1126 as->urb->dev = ps->dev; 1127 as->urb->pipe = (uurb->type << 30) | 1128 __create_pipe(ps->dev, uurb->endpoint & 0xf) | 1129 (uurb->endpoint & USB_DIR_IN); 1130 1131 /* This tedious sequence is necessary because the URB_* flags 1132 * are internal to the kernel and subject to change, whereas 1133 * the USBDEVFS_URB_* flags are a user API and must not be changed. 1134 */ 1135 u = (is_in ? URB_DIR_IN : URB_DIR_OUT); 1136 if (uurb->flags & USBDEVFS_URB_ISO_ASAP) 1137 u |= URB_ISO_ASAP; 1138 if (uurb->flags & USBDEVFS_URB_SHORT_NOT_OK) 1139 u |= URB_SHORT_NOT_OK; 1140 if (uurb->flags & USBDEVFS_URB_NO_FSBR) 1141 u |= URB_NO_FSBR; 1142 if (uurb->flags & USBDEVFS_URB_ZERO_PACKET) 1143 u |= URB_ZERO_PACKET; 1144 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT) 1145 u |= URB_NO_INTERRUPT; 1146 as->urb->transfer_flags = u; 1147 1148 as->urb->transfer_buffer_length = uurb->buffer_length; 1149 as->urb->setup_packet = (unsigned char *)dr; 1150 as->urb->start_frame = uurb->start_frame; 1151 as->urb->number_of_packets = uurb->number_of_packets; 1152 if (uurb->type == USBDEVFS_URB_TYPE_ISO || 1153 ps->dev->speed == USB_SPEED_HIGH) 1154 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1); 1155 else 1156 as->urb->interval = ep->desc.bInterval; 1157 as->urb->context = as; 1158 as->urb->complete = async_completed; 1159 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1160 as->urb->iso_frame_desc[u].offset = totlen; 1161 as->urb->iso_frame_desc[u].length = isopkt[u].length; 1162 totlen += isopkt[u].length; 1163 } 1164 kfree(isopkt); 1165 as->ps = ps; 1166 as->userurb = arg; 1167 if (uurb->endpoint & USB_DIR_IN) 1168 as->userbuffer = uurb->buffer; 1169 else 1170 as->userbuffer = NULL; 1171 as->signr = uurb->signr; 1172 as->ifnum = ifnum; 1173 as->pid = get_pid(task_pid(current)); 1174 as->uid = current->uid; 1175 as->euid = current->euid; 1176 security_task_getsecid(current, &as->secid); 1177 if (!is_in) { 1178 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, 1179 as->urb->transfer_buffer_length)) { 1180 free_async(as); 1181 return -EFAULT; 1182 } 1183 } 1184 snoop_urb(as->urb, as->userurb); 1185 async_newpending(as); 1186 if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) { 1187 dev_printk(KERN_DEBUG, &ps->dev->dev, 1188 "usbfs: usb_submit_urb returned %d\n", ret); 1189 async_removepending(as); 1190 free_async(as); 1191 return ret; 1192 } 1193 return 0; 1194 } 1195 1196 static int proc_submiturb(struct dev_state *ps, void __user *arg) 1197 { 1198 struct usbdevfs_urb uurb; 1199 1200 if (copy_from_user(&uurb, arg, sizeof(uurb))) 1201 return -EFAULT; 1202 1203 return proc_do_submiturb(ps, &uurb, 1204 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), 1205 arg); 1206 } 1207 1208 static int proc_unlinkurb(struct dev_state *ps, void __user *arg) 1209 { 1210 struct async *as; 1211 1212 as = async_getpending(ps, arg); 1213 if (!as) 1214 return -EINVAL; 1215 usb_kill_urb(as->urb); 1216 return 0; 1217 } 1218 1219 static int processcompl(struct async *as, void __user * __user *arg) 1220 { 1221 struct urb *urb = as->urb; 1222 struct usbdevfs_urb __user *userurb = as->userurb; 1223 void __user *addr = as->userurb; 1224 unsigned int i; 1225 1226 if (as->userbuffer) 1227 if (copy_to_user(as->userbuffer, urb->transfer_buffer, 1228 urb->transfer_buffer_length)) 1229 return -EFAULT; 1230 if (put_user(as->status, &userurb->status)) 1231 return -EFAULT; 1232 if (put_user(urb->actual_length, &userurb->actual_length)) 1233 return -EFAULT; 1234 if (put_user(urb->error_count, &userurb->error_count)) 1235 return -EFAULT; 1236 1237 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 1238 for (i = 0; i < urb->number_of_packets; i++) { 1239 if (put_user(urb->iso_frame_desc[i].actual_length, 1240 &userurb->iso_frame_desc[i].actual_length)) 1241 return -EFAULT; 1242 if (put_user(urb->iso_frame_desc[i].status, 1243 &userurb->iso_frame_desc[i].status)) 1244 return -EFAULT; 1245 } 1246 } 1247 1248 free_async(as); 1249 1250 if (put_user(addr, (void __user * __user *)arg)) 1251 return -EFAULT; 1252 return 0; 1253 } 1254 1255 static struct async *reap_as(struct dev_state *ps) 1256 { 1257 DECLARE_WAITQUEUE(wait, current); 1258 struct async *as = NULL; 1259 struct usb_device *dev = ps->dev; 1260 1261 add_wait_queue(&ps->wait, &wait); 1262 for (;;) { 1263 __set_current_state(TASK_INTERRUPTIBLE); 1264 as = async_getcompleted(ps); 1265 if (as) 1266 break; 1267 if (signal_pending(current)) 1268 break; 1269 usb_unlock_device(dev); 1270 schedule(); 1271 usb_lock_device(dev); 1272 } 1273 remove_wait_queue(&ps->wait, &wait); 1274 set_current_state(TASK_RUNNING); 1275 return as; 1276 } 1277 1278 static int proc_reapurb(struct dev_state *ps, void __user *arg) 1279 { 1280 struct async *as = reap_as(ps); 1281 if (as) 1282 return processcompl(as, (void __user * __user *)arg); 1283 if (signal_pending(current)) 1284 return -EINTR; 1285 return -EIO; 1286 } 1287 1288 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg) 1289 { 1290 struct async *as; 1291 1292 if (!(as = async_getcompleted(ps))) 1293 return -EAGAIN; 1294 return processcompl(as, (void __user * __user *)arg); 1295 } 1296 1297 #ifdef CONFIG_COMPAT 1298 1299 static int get_urb32(struct usbdevfs_urb *kurb, 1300 struct usbdevfs_urb32 __user *uurb) 1301 { 1302 __u32 uptr; 1303 if (get_user(kurb->type, &uurb->type) || 1304 __get_user(kurb->endpoint, &uurb->endpoint) || 1305 __get_user(kurb->status, &uurb->status) || 1306 __get_user(kurb->flags, &uurb->flags) || 1307 __get_user(kurb->buffer_length, &uurb->buffer_length) || 1308 __get_user(kurb->actual_length, &uurb->actual_length) || 1309 __get_user(kurb->start_frame, &uurb->start_frame) || 1310 __get_user(kurb->number_of_packets, &uurb->number_of_packets) || 1311 __get_user(kurb->error_count, &uurb->error_count) || 1312 __get_user(kurb->signr, &uurb->signr)) 1313 return -EFAULT; 1314 1315 if (__get_user(uptr, &uurb->buffer)) 1316 return -EFAULT; 1317 kurb->buffer = compat_ptr(uptr); 1318 if (__get_user(uptr, &uurb->buffer)) 1319 return -EFAULT; 1320 kurb->usercontext = compat_ptr(uptr); 1321 1322 return 0; 1323 } 1324 1325 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg) 1326 { 1327 struct usbdevfs_urb uurb; 1328 1329 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg)) 1330 return -EFAULT; 1331 1332 return proc_do_submiturb(ps, &uurb, 1333 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, 1334 arg); 1335 } 1336 1337 static int processcompl_compat(struct async *as, void __user * __user *arg) 1338 { 1339 struct urb *urb = as->urb; 1340 struct usbdevfs_urb32 __user *userurb = as->userurb; 1341 void __user *addr = as->userurb; 1342 unsigned int i; 1343 1344 if (as->userbuffer) 1345 if (copy_to_user(as->userbuffer, urb->transfer_buffer, 1346 urb->transfer_buffer_length)) 1347 return -EFAULT; 1348 if (put_user(as->status, &userurb->status)) 1349 return -EFAULT; 1350 if (put_user(urb->actual_length, &userurb->actual_length)) 1351 return -EFAULT; 1352 if (put_user(urb->error_count, &userurb->error_count)) 1353 return -EFAULT; 1354 1355 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 1356 for (i = 0; i < urb->number_of_packets; i++) { 1357 if (put_user(urb->iso_frame_desc[i].actual_length, 1358 &userurb->iso_frame_desc[i].actual_length)) 1359 return -EFAULT; 1360 if (put_user(urb->iso_frame_desc[i].status, 1361 &userurb->iso_frame_desc[i].status)) 1362 return -EFAULT; 1363 } 1364 } 1365 1366 free_async(as); 1367 if (put_user(ptr_to_compat(addr), (u32 __user *)arg)) 1368 return -EFAULT; 1369 return 0; 1370 } 1371 1372 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg) 1373 { 1374 struct async *as = reap_as(ps); 1375 if (as) 1376 return processcompl_compat(as, (void __user * __user *)arg); 1377 if (signal_pending(current)) 1378 return -EINTR; 1379 return -EIO; 1380 } 1381 1382 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg) 1383 { 1384 struct async *as; 1385 1386 if (!(as = async_getcompleted(ps))) 1387 return -EAGAIN; 1388 return processcompl_compat(as, (void __user * __user *)arg); 1389 } 1390 1391 #endif 1392 1393 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg) 1394 { 1395 struct usbdevfs_disconnectsignal ds; 1396 1397 if (copy_from_user(&ds, arg, sizeof(ds))) 1398 return -EFAULT; 1399 if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX)) 1400 return -EINVAL; 1401 ps->discsignr = ds.signr; 1402 ps->disccontext = ds.context; 1403 return 0; 1404 } 1405 1406 static int proc_claiminterface(struct dev_state *ps, void __user *arg) 1407 { 1408 unsigned int ifnum; 1409 1410 if (get_user(ifnum, (unsigned int __user *)arg)) 1411 return -EFAULT; 1412 return claimintf(ps, ifnum); 1413 } 1414 1415 static int proc_releaseinterface(struct dev_state *ps, void __user *arg) 1416 { 1417 unsigned int ifnum; 1418 int ret; 1419 1420 if (get_user(ifnum, (unsigned int __user *)arg)) 1421 return -EFAULT; 1422 if ((ret = releaseintf(ps, ifnum)) < 0) 1423 return ret; 1424 destroy_async_on_interface (ps, ifnum); 1425 return 0; 1426 } 1427 1428 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl) 1429 { 1430 int size; 1431 void *buf = NULL; 1432 int retval = 0; 1433 struct usb_interface *intf = NULL; 1434 struct usb_driver *driver = NULL; 1435 1436 /* alloc buffer */ 1437 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) { 1438 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL) 1439 return -ENOMEM; 1440 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) { 1441 if (copy_from_user(buf, ctl->data, size)) { 1442 kfree(buf); 1443 return -EFAULT; 1444 } 1445 } else { 1446 memset(buf, 0, size); 1447 } 1448 } 1449 1450 if (!connected(ps)) { 1451 kfree(buf); 1452 return -ENODEV; 1453 } 1454 1455 if (ps->dev->state != USB_STATE_CONFIGURED) 1456 retval = -EHOSTUNREACH; 1457 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno))) 1458 retval = -EINVAL; 1459 else switch (ctl->ioctl_code) { 1460 1461 /* disconnect kernel driver from interface */ 1462 case USBDEVFS_DISCONNECT: 1463 if (intf->dev.driver) { 1464 driver = to_usb_driver(intf->dev.driver); 1465 dev_dbg(&intf->dev, "disconnect by usbfs\n"); 1466 usb_driver_release_interface(driver, intf); 1467 } else 1468 retval = -ENODATA; 1469 break; 1470 1471 /* let kernel drivers try to (re)bind to the interface */ 1472 case USBDEVFS_CONNECT: 1473 if (!intf->dev.driver) 1474 retval = device_attach(&intf->dev); 1475 else 1476 retval = -EBUSY; 1477 break; 1478 1479 /* talk directly to the interface's driver */ 1480 default: 1481 if (intf->dev.driver) 1482 driver = to_usb_driver(intf->dev.driver); 1483 if (driver == NULL || driver->ioctl == NULL) { 1484 retval = -ENOTTY; 1485 } else { 1486 retval = driver->ioctl(intf, ctl->ioctl_code, buf); 1487 if (retval == -ENOIOCTLCMD) 1488 retval = -ENOTTY; 1489 } 1490 } 1491 1492 /* cleanup and return */ 1493 if (retval >= 0 1494 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0 1495 && size > 0 1496 && copy_to_user(ctl->data, buf, size) != 0) 1497 retval = -EFAULT; 1498 1499 kfree(buf); 1500 return retval; 1501 } 1502 1503 static int proc_ioctl_default(struct dev_state *ps, void __user *arg) 1504 { 1505 struct usbdevfs_ioctl ctrl; 1506 1507 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 1508 return -EFAULT; 1509 return proc_ioctl(ps, &ctrl); 1510 } 1511 1512 #ifdef CONFIG_COMPAT 1513 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg) 1514 { 1515 struct usbdevfs_ioctl32 __user *uioc; 1516 struct usbdevfs_ioctl ctrl; 1517 u32 udata; 1518 1519 uioc = compat_ptr((long)arg); 1520 if (get_user(ctrl.ifno, &uioc->ifno) || 1521 get_user(ctrl.ioctl_code, &uioc->ioctl_code) || 1522 __get_user(udata, &uioc->data)) 1523 return -EFAULT; 1524 ctrl.data = compat_ptr(udata); 1525 1526 return proc_ioctl(ps, &ctrl); 1527 } 1528 #endif 1529 1530 /* 1531 * NOTE: All requests here that have interface numbers as parameters 1532 * are assuming that somehow the configuration has been prevented from 1533 * changing. But there's no mechanism to ensure that... 1534 */ 1535 static int usbdev_ioctl(struct inode *inode, struct file *file, 1536 unsigned int cmd, unsigned long arg) 1537 { 1538 struct dev_state *ps = file->private_data; 1539 struct usb_device *dev = ps->dev; 1540 void __user *p = (void __user *)arg; 1541 int ret = -ENOTTY; 1542 1543 if (!(file->f_mode & FMODE_WRITE)) 1544 return -EPERM; 1545 usb_lock_device(dev); 1546 if (!connected(ps)) { 1547 usb_unlock_device(dev); 1548 return -ENODEV; 1549 } 1550 1551 switch (cmd) { 1552 case USBDEVFS_CONTROL: 1553 snoop(&dev->dev, "%s: CONTROL\n", __func__); 1554 ret = proc_control(ps, p); 1555 if (ret >= 0) 1556 inode->i_mtime = CURRENT_TIME; 1557 break; 1558 1559 case USBDEVFS_BULK: 1560 snoop(&dev->dev, "%s: BULK\n", __func__); 1561 ret = proc_bulk(ps, p); 1562 if (ret >= 0) 1563 inode->i_mtime = CURRENT_TIME; 1564 break; 1565 1566 case USBDEVFS_RESETEP: 1567 snoop(&dev->dev, "%s: RESETEP\n", __func__); 1568 ret = proc_resetep(ps, p); 1569 if (ret >= 0) 1570 inode->i_mtime = CURRENT_TIME; 1571 break; 1572 1573 case USBDEVFS_RESET: 1574 snoop(&dev->dev, "%s: RESET\n", __func__); 1575 ret = proc_resetdevice(ps); 1576 break; 1577 1578 case USBDEVFS_CLEAR_HALT: 1579 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__); 1580 ret = proc_clearhalt(ps, p); 1581 if (ret >= 0) 1582 inode->i_mtime = CURRENT_TIME; 1583 break; 1584 1585 case USBDEVFS_GETDRIVER: 1586 snoop(&dev->dev, "%s: GETDRIVER\n", __func__); 1587 ret = proc_getdriver(ps, p); 1588 break; 1589 1590 case USBDEVFS_CONNECTINFO: 1591 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__); 1592 ret = proc_connectinfo(ps, p); 1593 break; 1594 1595 case USBDEVFS_SETINTERFACE: 1596 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__); 1597 ret = proc_setintf(ps, p); 1598 break; 1599 1600 case USBDEVFS_SETCONFIGURATION: 1601 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__); 1602 ret = proc_setconfig(ps, p); 1603 break; 1604 1605 case USBDEVFS_SUBMITURB: 1606 snoop(&dev->dev, "%s: SUBMITURB\n", __func__); 1607 ret = proc_submiturb(ps, p); 1608 if (ret >= 0) 1609 inode->i_mtime = CURRENT_TIME; 1610 break; 1611 1612 #ifdef CONFIG_COMPAT 1613 1614 case USBDEVFS_SUBMITURB32: 1615 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__); 1616 ret = proc_submiturb_compat(ps, p); 1617 if (ret >= 0) 1618 inode->i_mtime = CURRENT_TIME; 1619 break; 1620 1621 case USBDEVFS_REAPURB32: 1622 snoop(&dev->dev, "%s: REAPURB32\n", __func__); 1623 ret = proc_reapurb_compat(ps, p); 1624 break; 1625 1626 case USBDEVFS_REAPURBNDELAY32: 1627 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __func__); 1628 ret = proc_reapurbnonblock_compat(ps, p); 1629 break; 1630 1631 case USBDEVFS_IOCTL32: 1632 snoop(&dev->dev, "%s: IOCTL\n", __func__); 1633 ret = proc_ioctl_compat(ps, ptr_to_compat(p)); 1634 break; 1635 #endif 1636 1637 case USBDEVFS_DISCARDURB: 1638 snoop(&dev->dev, "%s: DISCARDURB\n", __func__); 1639 ret = proc_unlinkurb(ps, p); 1640 break; 1641 1642 case USBDEVFS_REAPURB: 1643 snoop(&dev->dev, "%s: REAPURB\n", __func__); 1644 ret = proc_reapurb(ps, p); 1645 break; 1646 1647 case USBDEVFS_REAPURBNDELAY: 1648 snoop(&dev->dev, "%s: REAPURBDELAY\n", __func__); 1649 ret = proc_reapurbnonblock(ps, p); 1650 break; 1651 1652 case USBDEVFS_DISCSIGNAL: 1653 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__); 1654 ret = proc_disconnectsignal(ps, p); 1655 break; 1656 1657 case USBDEVFS_CLAIMINTERFACE: 1658 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__); 1659 ret = proc_claiminterface(ps, p); 1660 break; 1661 1662 case USBDEVFS_RELEASEINTERFACE: 1663 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__); 1664 ret = proc_releaseinterface(ps, p); 1665 break; 1666 1667 case USBDEVFS_IOCTL: 1668 snoop(&dev->dev, "%s: IOCTL\n", __func__); 1669 ret = proc_ioctl_default(ps, p); 1670 break; 1671 } 1672 usb_unlock_device(dev); 1673 if (ret >= 0) 1674 inode->i_atime = CURRENT_TIME; 1675 return ret; 1676 } 1677 1678 /* No kernel lock - fine */ 1679 static unsigned int usbdev_poll(struct file *file, 1680 struct poll_table_struct *wait) 1681 { 1682 struct dev_state *ps = file->private_data; 1683 unsigned int mask = 0; 1684 1685 poll_wait(file, &ps->wait, wait); 1686 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed)) 1687 mask |= POLLOUT | POLLWRNORM; 1688 if (!connected(ps)) 1689 mask |= POLLERR | POLLHUP; 1690 return mask; 1691 } 1692 1693 const struct file_operations usbdev_file_operations = { 1694 .owner = THIS_MODULE, 1695 .llseek = usbdev_lseek, 1696 .read = usbdev_read, 1697 .poll = usbdev_poll, 1698 .ioctl = usbdev_ioctl, 1699 .open = usbdev_open, 1700 .release = usbdev_release, 1701 }; 1702 1703 void usb_fs_classdev_common_remove(struct usb_device *udev) 1704 { 1705 struct dev_state *ps; 1706 struct siginfo sinfo; 1707 1708 while (!list_empty(&udev->filelist)) { 1709 ps = list_entry(udev->filelist.next, struct dev_state, list); 1710 destroy_all_async(ps); 1711 wake_up_all(&ps->wait); 1712 list_del_init(&ps->list); 1713 if (ps->discsignr) { 1714 sinfo.si_signo = ps->discsignr; 1715 sinfo.si_errno = EPIPE; 1716 sinfo.si_code = SI_ASYNCIO; 1717 sinfo.si_addr = ps->disccontext; 1718 kill_pid_info_as_uid(ps->discsignr, &sinfo, 1719 ps->disc_pid, ps->disc_uid, 1720 ps->disc_euid, ps->secid); 1721 } 1722 } 1723 } 1724 1725 #ifdef CONFIG_USB_DEVICE_CLASS 1726 static struct class *usb_classdev_class; 1727 1728 static int usb_classdev_add(struct usb_device *dev) 1729 { 1730 struct device *cldev; 1731 1732 cldev = device_create_drvdata(usb_classdev_class, &dev->dev, 1733 dev->dev.devt, NULL, "usbdev%d.%d", 1734 dev->bus->busnum, dev->devnum); 1735 if (IS_ERR(cldev)) 1736 return PTR_ERR(cldev); 1737 dev->usb_classdev = cldev; 1738 return 0; 1739 } 1740 1741 static void usb_classdev_remove(struct usb_device *dev) 1742 { 1743 if (dev->usb_classdev) 1744 device_unregister(dev->usb_classdev); 1745 usb_fs_classdev_common_remove(dev); 1746 } 1747 1748 static int usb_classdev_notify(struct notifier_block *self, 1749 unsigned long action, void *dev) 1750 { 1751 switch (action) { 1752 case USB_DEVICE_ADD: 1753 if (usb_classdev_add(dev)) 1754 return NOTIFY_BAD; 1755 break; 1756 case USB_DEVICE_REMOVE: 1757 usb_classdev_remove(dev); 1758 break; 1759 } 1760 return NOTIFY_OK; 1761 } 1762 1763 static struct notifier_block usbdev_nb = { 1764 .notifier_call = usb_classdev_notify, 1765 }; 1766 #endif 1767 1768 static struct cdev usb_device_cdev; 1769 1770 int __init usb_devio_init(void) 1771 { 1772 int retval; 1773 1774 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX, 1775 "usb_device"); 1776 if (retval) { 1777 err("unable to register minors for usb_device"); 1778 goto out; 1779 } 1780 cdev_init(&usb_device_cdev, &usbdev_file_operations); 1781 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX); 1782 if (retval) { 1783 err("unable to get usb_device major %d", USB_DEVICE_MAJOR); 1784 goto error_cdev; 1785 } 1786 #ifdef CONFIG_USB_DEVICE_CLASS 1787 usb_classdev_class = class_create(THIS_MODULE, "usb_device"); 1788 if (IS_ERR(usb_classdev_class)) { 1789 err("unable to register usb_device class"); 1790 retval = PTR_ERR(usb_classdev_class); 1791 cdev_del(&usb_device_cdev); 1792 usb_classdev_class = NULL; 1793 goto out; 1794 } 1795 /* devices of this class shadow the major:minor of their parent 1796 * device, so clear ->dev_kobj to prevent adding duplicate entries 1797 * to /sys/dev 1798 */ 1799 usb_classdev_class->dev_kobj = NULL; 1800 1801 usb_register_notify(&usbdev_nb); 1802 #endif 1803 out: 1804 return retval; 1805 1806 error_cdev: 1807 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 1808 goto out; 1809 } 1810 1811 void usb_devio_cleanup(void) 1812 { 1813 #ifdef CONFIG_USB_DEVICE_CLASS 1814 usb_unregister_notify(&usbdev_nb); 1815 class_destroy(usb_classdev_class); 1816 #endif 1817 cdev_del(&usb_device_cdev); 1818 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 1819 } 1820