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 * $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $ 23 * 24 * This file implements the usbfs/x/y files, where 25 * x is the bus number and y the device number. 26 * 27 * It allows user space programs/"drivers" to communicate directly 28 * with USB devices without intervening kernel driver. 29 * 30 * Revision history 31 * 22.12.1999 0.1 Initial release (split from proc_usb.c) 32 * 04.01.2000 0.2 Turned into its own filesystem 33 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery 34 * (CAN-2005-3055) 35 */ 36 37 /*****************************************************************************/ 38 39 #include <linux/fs.h> 40 #include <linux/mm.h> 41 #include <linux/slab.h> 42 #include <linux/smp_lock.h> 43 #include <linux/signal.h> 44 #include <linux/poll.h> 45 #include <linux/module.h> 46 #include <linux/usb.h> 47 #include <linux/usbdevice_fs.h> 48 #include <linux/cdev.h> 49 #include <linux/notifier.h> 50 #include <linux/security.h> 51 #include <asm/uaccess.h> 52 #include <asm/byteorder.h> 53 #include <linux/moduleparam.h> 54 55 #include "hcd.h" /* for usbcore internals */ 56 #include "usb.h" 57 58 #define USB_MAXBUS 64 59 #define USB_DEVICE_MAX USB_MAXBUS * 128 60 61 /* Mutual exclusion for removal, open, and release */ 62 DEFINE_MUTEX(usbfs_mutex); 63 64 struct async { 65 struct list_head asynclist; 66 struct dev_state *ps; 67 struct pid *pid; 68 uid_t uid, euid; 69 unsigned int signr; 70 unsigned int ifnum; 71 void __user *userbuffer; 72 void __user *userurb; 73 struct urb *urb; 74 int status; 75 u32 secid; 76 }; 77 78 static int usbfs_snoop; 79 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR); 80 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic"); 81 82 #define snoop(dev, format, arg...) \ 83 do { \ 84 if (usbfs_snoop) \ 85 dev_info(dev , format , ## arg); \ 86 } while (0) 87 88 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0) 89 90 91 #define MAX_USBFS_BUFFER_SIZE 16384 92 93 static inline int connected(struct dev_state *ps) 94 { 95 return (!list_empty(&ps->list) && 96 ps->dev->state != USB_STATE_NOTATTACHED); 97 } 98 99 static loff_t usbdev_lseek(struct file *file, loff_t offset, int orig) 100 { 101 loff_t ret; 102 103 lock_kernel(); 104 105 switch (orig) { 106 case 0: 107 file->f_pos = offset; 108 ret = file->f_pos; 109 break; 110 case 1: 111 file->f_pos += offset; 112 ret = file->f_pos; 113 break; 114 case 2: 115 default: 116 ret = -EINVAL; 117 } 118 119 unlock_kernel(); 120 return ret; 121 } 122 123 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes, 124 loff_t *ppos) 125 { 126 struct dev_state *ps = file->private_data; 127 struct usb_device *dev = ps->dev; 128 ssize_t ret = 0; 129 unsigned len; 130 loff_t pos; 131 int i; 132 133 pos = *ppos; 134 usb_lock_device(dev); 135 if (!connected(ps)) { 136 ret = -ENODEV; 137 goto err; 138 } else if (pos < 0) { 139 ret = -EINVAL; 140 goto err; 141 } 142 143 if (pos < sizeof(struct usb_device_descriptor)) { 144 /* 18 bytes - fits on the stack */ 145 struct usb_device_descriptor temp_desc; 146 147 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor)); 148 le16_to_cpus(&temp_desc.bcdUSB); 149 le16_to_cpus(&temp_desc.idVendor); 150 le16_to_cpus(&temp_desc.idProduct); 151 le16_to_cpus(&temp_desc.bcdDevice); 152 153 len = sizeof(struct usb_device_descriptor) - pos; 154 if (len > nbytes) 155 len = nbytes; 156 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) { 157 ret = -EFAULT; 158 goto err; 159 } 160 161 *ppos += len; 162 buf += len; 163 nbytes -= len; 164 ret += len; 165 } 166 167 pos = sizeof(struct usb_device_descriptor); 168 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) { 169 struct usb_config_descriptor *config = 170 (struct usb_config_descriptor *)dev->rawdescriptors[i]; 171 unsigned int length = le16_to_cpu(config->wTotalLength); 172 173 if (*ppos < pos + length) { 174 175 /* The descriptor may claim to be longer than it 176 * really is. Here is the actual allocated length. */ 177 unsigned alloclen = 178 le16_to_cpu(dev->config[i].desc.wTotalLength); 179 180 len = length - (*ppos - pos); 181 if (len > nbytes) 182 len = nbytes; 183 184 /* Simply don't write (skip over) unallocated parts */ 185 if (alloclen > (*ppos - pos)) { 186 alloclen -= (*ppos - pos); 187 if (copy_to_user(buf, 188 dev->rawdescriptors[i] + (*ppos - pos), 189 min(len, alloclen))) { 190 ret = -EFAULT; 191 goto err; 192 } 193 } 194 195 *ppos += len; 196 buf += len; 197 nbytes -= len; 198 ret += len; 199 } 200 201 pos += length; 202 } 203 204 err: 205 usb_unlock_device(dev); 206 return ret; 207 } 208 209 /* 210 * async list handling 211 */ 212 213 static struct async *alloc_async(unsigned int numisoframes) 214 { 215 struct async *as; 216 217 as = kzalloc(sizeof(struct async), GFP_KERNEL); 218 if (!as) 219 return NULL; 220 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL); 221 if (!as->urb) { 222 kfree(as); 223 return NULL; 224 } 225 return as; 226 } 227 228 static void free_async(struct async *as) 229 { 230 put_pid(as->pid); 231 kfree(as->urb->transfer_buffer); 232 kfree(as->urb->setup_packet); 233 usb_free_urb(as->urb); 234 kfree(as); 235 } 236 237 static inline void async_newpending(struct async *as) 238 { 239 struct dev_state *ps = as->ps; 240 unsigned long flags; 241 242 spin_lock_irqsave(&ps->lock, flags); 243 list_add_tail(&as->asynclist, &ps->async_pending); 244 spin_unlock_irqrestore(&ps->lock, flags); 245 } 246 247 static inline void async_removepending(struct async *as) 248 { 249 struct dev_state *ps = as->ps; 250 unsigned long flags; 251 252 spin_lock_irqsave(&ps->lock, flags); 253 list_del_init(&as->asynclist); 254 spin_unlock_irqrestore(&ps->lock, flags); 255 } 256 257 static inline struct async *async_getcompleted(struct dev_state *ps) 258 { 259 unsigned long flags; 260 struct async *as = NULL; 261 262 spin_lock_irqsave(&ps->lock, flags); 263 if (!list_empty(&ps->async_completed)) { 264 as = list_entry(ps->async_completed.next, struct async, 265 asynclist); 266 list_del_init(&as->asynclist); 267 } 268 spin_unlock_irqrestore(&ps->lock, flags); 269 return as; 270 } 271 272 static inline struct async *async_getpending(struct dev_state *ps, 273 void __user *userurb) 274 { 275 unsigned long flags; 276 struct async *as; 277 278 spin_lock_irqsave(&ps->lock, flags); 279 list_for_each_entry(as, &ps->async_pending, asynclist) 280 if (as->userurb == userurb) { 281 list_del_init(&as->asynclist); 282 spin_unlock_irqrestore(&ps->lock, flags); 283 return as; 284 } 285 spin_unlock_irqrestore(&ps->lock, flags); 286 return NULL; 287 } 288 289 static void snoop_urb(struct urb *urb, void __user *userurb) 290 { 291 int j; 292 unsigned char *data = urb->transfer_buffer; 293 294 if (!usbfs_snoop) 295 return; 296 297 dev_info(&urb->dev->dev, "direction=%s\n", 298 usb_urb_dir_in(urb) ? "IN" : "OUT"); 299 dev_info(&urb->dev->dev, "userurb=%p\n", userurb); 300 dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n", 301 urb->transfer_buffer_length); 302 dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length); 303 dev_info(&urb->dev->dev, "data: "); 304 for (j = 0; j < urb->transfer_buffer_length; ++j) 305 printk("%02x ", data[j]); 306 printk("\n"); 307 } 308 309 static void async_completed(struct urb *urb) 310 { 311 struct async *as = urb->context; 312 struct dev_state *ps = as->ps; 313 struct siginfo sinfo; 314 315 spin_lock(&ps->lock); 316 list_move_tail(&as->asynclist, &ps->async_completed); 317 spin_unlock(&ps->lock); 318 as->status = urb->status; 319 if (as->signr) { 320 sinfo.si_signo = as->signr; 321 sinfo.si_errno = as->status; 322 sinfo.si_code = SI_ASYNCIO; 323 sinfo.si_addr = as->userurb; 324 kill_pid_info_as_uid(as->signr, &sinfo, as->pid, as->uid, 325 as->euid, as->secid); 326 } 327 snoop(&urb->dev->dev, "urb complete\n"); 328 snoop_urb(urb, as->userurb); 329 wake_up(&ps->wait); 330 } 331 332 static void destroy_async(struct dev_state *ps, struct list_head *list) 333 { 334 struct async *as; 335 unsigned long flags; 336 337 spin_lock_irqsave(&ps->lock, flags); 338 while (!list_empty(list)) { 339 as = list_entry(list->next, struct async, asynclist); 340 list_del_init(&as->asynclist); 341 342 /* drop the spinlock so the completion handler can run */ 343 spin_unlock_irqrestore(&ps->lock, flags); 344 usb_kill_urb(as->urb); 345 spin_lock_irqsave(&ps->lock, flags); 346 } 347 spin_unlock_irqrestore(&ps->lock, flags); 348 as = async_getcompleted(ps); 349 while (as) { 350 free_async(as); 351 as = async_getcompleted(ps); 352 } 353 } 354 355 static void destroy_async_on_interface(struct dev_state *ps, 356 unsigned int ifnum) 357 { 358 struct list_head *p, *q, hitlist; 359 unsigned long flags; 360 361 INIT_LIST_HEAD(&hitlist); 362 spin_lock_irqsave(&ps->lock, flags); 363 list_for_each_safe(p, q, &ps->async_pending) 364 if (ifnum == list_entry(p, struct async, asynclist)->ifnum) 365 list_move_tail(p, &hitlist); 366 spin_unlock_irqrestore(&ps->lock, flags); 367 destroy_async(ps, &hitlist); 368 } 369 370 static inline void destroy_all_async(struct dev_state *ps) 371 { 372 destroy_async(ps, &ps->async_pending); 373 } 374 375 /* 376 * interface claims are made only at the request of user level code, 377 * which can also release them (explicitly or by closing files). 378 * they're also undone when devices disconnect. 379 */ 380 381 static int driver_probe(struct usb_interface *intf, 382 const struct usb_device_id *id) 383 { 384 return -ENODEV; 385 } 386 387 static void driver_disconnect(struct usb_interface *intf) 388 { 389 struct dev_state *ps = usb_get_intfdata(intf); 390 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber; 391 392 if (!ps) 393 return; 394 395 /* NOTE: this relies on usbcore having canceled and completed 396 * all pending I/O requests; 2.6 does that. 397 */ 398 399 if (likely(ifnum < 8*sizeof(ps->ifclaimed))) 400 clear_bit(ifnum, &ps->ifclaimed); 401 else 402 warn("interface number %u out of range", ifnum); 403 404 usb_set_intfdata(intf, NULL); 405 406 /* force async requests to complete */ 407 destroy_async_on_interface(ps, ifnum); 408 } 409 410 /* The following routines are merely placeholders. There is no way 411 * to inform a user task about suspend or resumes. 412 */ 413 static int driver_suspend(struct usb_interface *intf, pm_message_t msg) 414 { 415 return 0; 416 } 417 418 static int driver_resume(struct usb_interface *intf) 419 { 420 return 0; 421 } 422 423 struct usb_driver usbfs_driver = { 424 .name = "usbfs", 425 .probe = driver_probe, 426 .disconnect = driver_disconnect, 427 .suspend = driver_suspend, 428 .resume = driver_resume, 429 }; 430 431 static int claimintf(struct dev_state *ps, unsigned int ifnum) 432 { 433 struct usb_device *dev = ps->dev; 434 struct usb_interface *intf; 435 int err; 436 437 if (ifnum >= 8*sizeof(ps->ifclaimed)) 438 return -EINVAL; 439 /* already claimed */ 440 if (test_bit(ifnum, &ps->ifclaimed)) 441 return 0; 442 443 intf = usb_ifnum_to_if(dev, ifnum); 444 if (!intf) 445 err = -ENOENT; 446 else 447 err = usb_driver_claim_interface(&usbfs_driver, intf, ps); 448 if (err == 0) 449 set_bit(ifnum, &ps->ifclaimed); 450 return err; 451 } 452 453 static int releaseintf(struct dev_state *ps, unsigned int ifnum) 454 { 455 struct usb_device *dev; 456 struct usb_interface *intf; 457 int err; 458 459 err = -EINVAL; 460 if (ifnum >= 8*sizeof(ps->ifclaimed)) 461 return err; 462 dev = ps->dev; 463 intf = usb_ifnum_to_if(dev, ifnum); 464 if (!intf) 465 err = -ENOENT; 466 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) { 467 usb_driver_release_interface(&usbfs_driver, intf); 468 err = 0; 469 } 470 return err; 471 } 472 473 static int checkintf(struct dev_state *ps, unsigned int ifnum) 474 { 475 if (ps->dev->state != USB_STATE_CONFIGURED) 476 return -EHOSTUNREACH; 477 if (ifnum >= 8*sizeof(ps->ifclaimed)) 478 return -EINVAL; 479 if (test_bit(ifnum, &ps->ifclaimed)) 480 return 0; 481 /* if not yet claimed, claim it for the driver */ 482 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim " 483 "interface %u before use\n", task_pid_nr(current), 484 current->comm, ifnum); 485 return claimintf(ps, ifnum); 486 } 487 488 static int findintfep(struct usb_device *dev, unsigned int ep) 489 { 490 unsigned int i, j, e; 491 struct usb_interface *intf; 492 struct usb_host_interface *alts; 493 struct usb_endpoint_descriptor *endpt; 494 495 if (ep & ~(USB_DIR_IN|0xf)) 496 return -EINVAL; 497 if (!dev->actconfig) 498 return -ESRCH; 499 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) { 500 intf = dev->actconfig->interface[i]; 501 for (j = 0; j < intf->num_altsetting; j++) { 502 alts = &intf->altsetting[j]; 503 for (e = 0; e < alts->desc.bNumEndpoints; e++) { 504 endpt = &alts->endpoint[e].desc; 505 if (endpt->bEndpointAddress == ep) 506 return alts->desc.bInterfaceNumber; 507 } 508 } 509 } 510 return -ENOENT; 511 } 512 513 static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, 514 unsigned int index) 515 { 516 int ret = 0; 517 518 if (ps->dev->state != USB_STATE_ADDRESS 519 && ps->dev->state != USB_STATE_CONFIGURED) 520 return -EHOSTUNREACH; 521 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype)) 522 return 0; 523 524 index &= 0xff; 525 switch (requesttype & USB_RECIP_MASK) { 526 case USB_RECIP_ENDPOINT: 527 ret = findintfep(ps->dev, index); 528 if (ret >= 0) 529 ret = checkintf(ps, ret); 530 break; 531 532 case USB_RECIP_INTERFACE: 533 ret = checkintf(ps, index); 534 break; 535 } 536 return ret; 537 } 538 539 static int __match_minor(struct device *dev, void *data) 540 { 541 int minor = *((int *)data); 542 543 if (dev->devt == MKDEV(USB_DEVICE_MAJOR, minor)) 544 return 1; 545 return 0; 546 } 547 548 static struct usb_device *usbdev_lookup_by_minor(int minor) 549 { 550 struct device *dev; 551 552 dev = bus_find_device(&usb_bus_type, NULL, &minor, __match_minor); 553 if (!dev) 554 return NULL; 555 put_device(dev); 556 return container_of(dev, struct usb_device, dev); 557 } 558 559 /* 560 * file operations 561 */ 562 static int usbdev_open(struct inode *inode, struct file *file) 563 { 564 struct usb_device *dev = NULL; 565 struct dev_state *ps; 566 int ret; 567 568 /* Protect against simultaneous removal or release */ 569 mutex_lock(&usbfs_mutex); 570 571 ret = -ENOMEM; 572 ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL); 573 if (!ps) 574 goto out; 575 576 ret = -ENOENT; 577 /* usbdev device-node */ 578 if (imajor(inode) == USB_DEVICE_MAJOR) 579 dev = usbdev_lookup_by_minor(iminor(inode)); 580 #ifdef CONFIG_USB_DEVICEFS 581 /* procfs file */ 582 if (!dev) 583 dev = inode->i_private; 584 #endif 585 if (!dev) 586 goto out; 587 ret = usb_autoresume_device(dev); 588 if (ret) 589 goto out; 590 591 usb_get_dev(dev); 592 ret = 0; 593 ps->dev = dev; 594 ps->file = file; 595 spin_lock_init(&ps->lock); 596 INIT_LIST_HEAD(&ps->list); 597 INIT_LIST_HEAD(&ps->async_pending); 598 INIT_LIST_HEAD(&ps->async_completed); 599 init_waitqueue_head(&ps->wait); 600 ps->discsignr = 0; 601 ps->disc_pid = get_pid(task_pid(current)); 602 ps->disc_uid = current->uid; 603 ps->disc_euid = current->euid; 604 ps->disccontext = NULL; 605 ps->ifclaimed = 0; 606 security_task_getsecid(current, &ps->secid); 607 smp_wmb(); 608 list_add_tail(&ps->list, &dev->filelist); 609 file->private_data = ps; 610 out: 611 if (ret) 612 kfree(ps); 613 mutex_unlock(&usbfs_mutex); 614 return ret; 615 } 616 617 static int usbdev_release(struct inode *inode, struct file *file) 618 { 619 struct dev_state *ps = file->private_data; 620 struct usb_device *dev = ps->dev; 621 unsigned int ifnum; 622 623 usb_lock_device(dev); 624 625 /* Protect against simultaneous open */ 626 mutex_lock(&usbfs_mutex); 627 list_del_init(&ps->list); 628 mutex_unlock(&usbfs_mutex); 629 630 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed); 631 ifnum++) { 632 if (test_bit(ifnum, &ps->ifclaimed)) 633 releaseintf(ps, ifnum); 634 } 635 destroy_all_async(ps); 636 usb_autosuspend_device(dev); 637 usb_unlock_device(dev); 638 usb_put_dev(dev); 639 put_pid(ps->disc_pid); 640 kfree(ps); 641 return 0; 642 } 643 644 static int proc_control(struct dev_state *ps, void __user *arg) 645 { 646 struct usb_device *dev = ps->dev; 647 struct usbdevfs_ctrltransfer ctrl; 648 unsigned int tmo; 649 unsigned char *tbuf; 650 int i, j, ret; 651 652 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 653 return -EFAULT; 654 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex); 655 if (ret) 656 return ret; 657 if (ctrl.wLength > PAGE_SIZE) 658 return -EINVAL; 659 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL); 660 if (!tbuf) 661 return -ENOMEM; 662 tmo = ctrl.timeout; 663 if (ctrl.bRequestType & 0x80) { 664 if (ctrl.wLength && !access_ok(VERIFY_WRITE, ctrl.data, 665 ctrl.wLength)) { 666 free_page((unsigned long)tbuf); 667 return -EINVAL; 668 } 669 snoop(&dev->dev, "control read: bRequest=%02x " 670 "bRrequestType=%02x wValue=%04x " 671 "wIndex=%04x wLength=%04x\n", 672 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, 673 ctrl.wIndex, ctrl.wLength); 674 675 usb_unlock_device(dev); 676 i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.bRequest, 677 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 678 tbuf, ctrl.wLength, tmo); 679 usb_lock_device(dev); 680 if ((i > 0) && ctrl.wLength) { 681 if (usbfs_snoop) { 682 dev_info(&dev->dev, "control read: data "); 683 for (j = 0; j < i; ++j) 684 printk("%02x ", (u8)(tbuf)[j]); 685 printk("\n"); 686 } 687 if (copy_to_user(ctrl.data, tbuf, i)) { 688 free_page((unsigned long)tbuf); 689 return -EFAULT; 690 } 691 } 692 } else { 693 if (ctrl.wLength) { 694 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) { 695 free_page((unsigned long)tbuf); 696 return -EFAULT; 697 } 698 } 699 snoop(&dev->dev, "control write: bRequest=%02x " 700 "bRrequestType=%02x wValue=%04x " 701 "wIndex=%04x wLength=%04x\n", 702 ctrl.bRequest, ctrl.bRequestType, ctrl.wValue, 703 ctrl.wIndex, ctrl.wLength); 704 if (usbfs_snoop) { 705 dev_info(&dev->dev, "control write: data: "); 706 for (j = 0; j < ctrl.wLength; ++j) 707 printk("%02x ", (unsigned char)(tbuf)[j]); 708 printk("\n"); 709 } 710 usb_unlock_device(dev); 711 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest, 712 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex, 713 tbuf, ctrl.wLength, tmo); 714 usb_lock_device(dev); 715 } 716 free_page((unsigned long)tbuf); 717 if (i < 0 && i != -EPIPE) { 718 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL " 719 "failed cmd %s rqt %u rq %u len %u ret %d\n", 720 current->comm, ctrl.bRequestType, ctrl.bRequest, 721 ctrl.wLength, i); 722 } 723 return i; 724 } 725 726 static int proc_bulk(struct dev_state *ps, void __user *arg) 727 { 728 struct usb_device *dev = ps->dev; 729 struct usbdevfs_bulktransfer bulk; 730 unsigned int tmo, len1, pipe; 731 int len2; 732 unsigned char *tbuf; 733 int i, j, ret; 734 735 if (copy_from_user(&bulk, arg, sizeof(bulk))) 736 return -EFAULT; 737 ret = findintfep(ps->dev, bulk.ep); 738 if (ret < 0) 739 return ret; 740 ret = checkintf(ps, ret); 741 if (ret) 742 return ret; 743 if (bulk.ep & USB_DIR_IN) 744 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f); 745 else 746 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f); 747 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN))) 748 return -EINVAL; 749 len1 = bulk.len; 750 if (len1 > MAX_USBFS_BUFFER_SIZE) 751 return -EINVAL; 752 if (!(tbuf = kmalloc(len1, GFP_KERNEL))) 753 return -ENOMEM; 754 tmo = bulk.timeout; 755 if (bulk.ep & 0x80) { 756 if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) { 757 kfree(tbuf); 758 return -EINVAL; 759 } 760 snoop(&dev->dev, "bulk read: len=0x%02x timeout=%04d\n", 761 bulk.len, bulk.timeout); 762 usb_unlock_device(dev); 763 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 764 usb_lock_device(dev); 765 if (!i && len2) { 766 if (usbfs_snoop) { 767 dev_info(&dev->dev, "bulk read: data "); 768 for (j = 0; j < len2; ++j) 769 printk("%02x ", (u8)(tbuf)[j]); 770 printk("\n"); 771 } 772 if (copy_to_user(bulk.data, tbuf, len2)) { 773 kfree(tbuf); 774 return -EFAULT; 775 } 776 } 777 } else { 778 if (len1) { 779 if (copy_from_user(tbuf, bulk.data, len1)) { 780 kfree(tbuf); 781 return -EFAULT; 782 } 783 } 784 snoop(&dev->dev, "bulk write: len=0x%02x timeout=%04d\n", 785 bulk.len, bulk.timeout); 786 if (usbfs_snoop) { 787 dev_info(&dev->dev, "bulk write: data: "); 788 for (j = 0; j < len1; ++j) 789 printk("%02x ", (unsigned char)(tbuf)[j]); 790 printk("\n"); 791 } 792 usb_unlock_device(dev); 793 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo); 794 usb_lock_device(dev); 795 } 796 kfree(tbuf); 797 if (i < 0) 798 return i; 799 return len2; 800 } 801 802 static int proc_resetep(struct dev_state *ps, void __user *arg) 803 { 804 unsigned int ep; 805 int ret; 806 807 if (get_user(ep, (unsigned int __user *)arg)) 808 return -EFAULT; 809 ret = findintfep(ps->dev, ep); 810 if (ret < 0) 811 return ret; 812 ret = checkintf(ps, ret); 813 if (ret) 814 return ret; 815 usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0); 816 return 0; 817 } 818 819 static int proc_clearhalt(struct dev_state *ps, void __user *arg) 820 { 821 unsigned int ep; 822 int pipe; 823 int ret; 824 825 if (get_user(ep, (unsigned int __user *)arg)) 826 return -EFAULT; 827 ret = findintfep(ps->dev, ep); 828 if (ret < 0) 829 return ret; 830 ret = checkintf(ps, ret); 831 if (ret) 832 return ret; 833 if (ep & USB_DIR_IN) 834 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f); 835 else 836 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f); 837 838 return usb_clear_halt(ps->dev, pipe); 839 } 840 841 static int proc_getdriver(struct dev_state *ps, void __user *arg) 842 { 843 struct usbdevfs_getdriver gd; 844 struct usb_interface *intf; 845 int ret; 846 847 if (copy_from_user(&gd, arg, sizeof(gd))) 848 return -EFAULT; 849 intf = usb_ifnum_to_if(ps->dev, gd.interface); 850 if (!intf || !intf->dev.driver) 851 ret = -ENODATA; 852 else { 853 strncpy(gd.driver, intf->dev.driver->name, 854 sizeof(gd.driver)); 855 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0); 856 } 857 return ret; 858 } 859 860 static int proc_connectinfo(struct dev_state *ps, void __user *arg) 861 { 862 struct usbdevfs_connectinfo ci; 863 864 ci.devnum = ps->dev->devnum; 865 ci.slow = ps->dev->speed == USB_SPEED_LOW; 866 if (copy_to_user(arg, &ci, sizeof(ci))) 867 return -EFAULT; 868 return 0; 869 } 870 871 static int proc_resetdevice(struct dev_state *ps) 872 { 873 return usb_reset_composite_device(ps->dev, NULL); 874 } 875 876 static int proc_setintf(struct dev_state *ps, void __user *arg) 877 { 878 struct usbdevfs_setinterface setintf; 879 int ret; 880 881 if (copy_from_user(&setintf, arg, sizeof(setintf))) 882 return -EFAULT; 883 if ((ret = checkintf(ps, setintf.interface))) 884 return ret; 885 return usb_set_interface(ps->dev, setintf.interface, 886 setintf.altsetting); 887 } 888 889 static int proc_setconfig(struct dev_state *ps, void __user *arg) 890 { 891 int u; 892 int status = 0; 893 struct usb_host_config *actconfig; 894 895 if (get_user(u, (int __user *)arg)) 896 return -EFAULT; 897 898 actconfig = ps->dev->actconfig; 899 900 /* Don't touch the device if any interfaces are claimed. 901 * It could interfere with other drivers' operations, and if 902 * an interface is claimed by usbfs it could easily deadlock. 903 */ 904 if (actconfig) { 905 int i; 906 907 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) { 908 if (usb_interface_claimed(actconfig->interface[i])) { 909 dev_warn(&ps->dev->dev, 910 "usbfs: interface %d claimed by %s " 911 "while '%s' sets config #%d\n", 912 actconfig->interface[i] 913 ->cur_altsetting 914 ->desc.bInterfaceNumber, 915 actconfig->interface[i] 916 ->dev.driver->name, 917 current->comm, u); 918 status = -EBUSY; 919 break; 920 } 921 } 922 } 923 924 /* SET_CONFIGURATION is often abused as a "cheap" driver reset, 925 * so avoid usb_set_configuration()'s kick to sysfs 926 */ 927 if (status == 0) { 928 if (actconfig && actconfig->desc.bConfigurationValue == u) 929 status = usb_reset_configuration(ps->dev); 930 else 931 status = usb_set_configuration(ps->dev, u); 932 } 933 934 return status; 935 } 936 937 static int proc_do_submiturb(struct dev_state *ps, struct usbdevfs_urb *uurb, 938 struct usbdevfs_iso_packet_desc __user *iso_frame_desc, 939 void __user *arg) 940 { 941 struct usbdevfs_iso_packet_desc *isopkt = NULL; 942 struct usb_host_endpoint *ep; 943 struct async *as; 944 struct usb_ctrlrequest *dr = NULL; 945 unsigned int u, totlen, isofrmlen; 946 int ret, ifnum = -1; 947 int is_in; 948 949 if (uurb->flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_SHORT_NOT_OK| 950 URB_NO_FSBR|URB_ZERO_PACKET)) 951 return -EINVAL; 952 if (!uurb->buffer) 953 return -EINVAL; 954 if (uurb->signr != 0 && (uurb->signr < SIGRTMIN || 955 uurb->signr > SIGRTMAX)) 956 return -EINVAL; 957 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && 958 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) { 959 ifnum = findintfep(ps->dev, uurb->endpoint); 960 if (ifnum < 0) 961 return ifnum; 962 ret = checkintf(ps, ifnum); 963 if (ret) 964 return ret; 965 } 966 if ((uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0) { 967 is_in = 1; 968 ep = ps->dev->ep_in[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 969 } else { 970 is_in = 0; 971 ep = ps->dev->ep_out[uurb->endpoint & USB_ENDPOINT_NUMBER_MASK]; 972 } 973 if (!ep) 974 return -ENOENT; 975 switch(uurb->type) { 976 case USBDEVFS_URB_TYPE_CONTROL: 977 if (!usb_endpoint_xfer_control(&ep->desc)) 978 return -EINVAL; 979 /* min 8 byte setup packet, 980 * max 8 byte setup plus an arbitrary data stage */ 981 if (uurb->buffer_length < 8 || 982 uurb->buffer_length > (8 + MAX_USBFS_BUFFER_SIZE)) 983 return -EINVAL; 984 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL); 985 if (!dr) 986 return -ENOMEM; 987 if (copy_from_user(dr, uurb->buffer, 8)) { 988 kfree(dr); 989 return -EFAULT; 990 } 991 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) { 992 kfree(dr); 993 return -EINVAL; 994 } 995 ret = check_ctrlrecip(ps, dr->bRequestType, 996 le16_to_cpup(&dr->wIndex)); 997 if (ret) { 998 kfree(dr); 999 return ret; 1000 } 1001 uurb->number_of_packets = 0; 1002 uurb->buffer_length = le16_to_cpup(&dr->wLength); 1003 uurb->buffer += 8; 1004 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) { 1005 is_in = 1; 1006 uurb->endpoint |= USB_DIR_IN; 1007 } else { 1008 is_in = 0; 1009 uurb->endpoint &= ~USB_DIR_IN; 1010 } 1011 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ, 1012 uurb->buffer, uurb->buffer_length)) { 1013 kfree(dr); 1014 return -EFAULT; 1015 } 1016 snoop(&ps->dev->dev, "control urb: bRequest=%02x " 1017 "bRrequestType=%02x wValue=%04x " 1018 "wIndex=%04x wLength=%04x\n", 1019 dr->bRequest, dr->bRequestType, 1020 __le16_to_cpup(&dr->wValue), 1021 __le16_to_cpup(&dr->wIndex), 1022 __le16_to_cpup(&dr->wLength)); 1023 break; 1024 1025 case USBDEVFS_URB_TYPE_BULK: 1026 switch (usb_endpoint_type(&ep->desc)) { 1027 case USB_ENDPOINT_XFER_CONTROL: 1028 case USB_ENDPOINT_XFER_ISOC: 1029 return -EINVAL; 1030 /* allow single-shot interrupt transfers, at bogus rates */ 1031 } 1032 uurb->number_of_packets = 0; 1033 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE) 1034 return -EINVAL; 1035 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ, 1036 uurb->buffer, uurb->buffer_length)) 1037 return -EFAULT; 1038 snoop(&ps->dev->dev, "bulk urb\n"); 1039 break; 1040 1041 case USBDEVFS_URB_TYPE_ISO: 1042 /* arbitrary limit */ 1043 if (uurb->number_of_packets < 1 || 1044 uurb->number_of_packets > 128) 1045 return -EINVAL; 1046 if (!usb_endpoint_xfer_isoc(&ep->desc)) 1047 return -EINVAL; 1048 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * 1049 uurb->number_of_packets; 1050 if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL))) 1051 return -ENOMEM; 1052 if (copy_from_user(isopkt, iso_frame_desc, isofrmlen)) { 1053 kfree(isopkt); 1054 return -EFAULT; 1055 } 1056 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1057 /* arbitrary limit, 1058 * sufficient for USB 2.0 high-bandwidth iso */ 1059 if (isopkt[u].length > 8192) { 1060 kfree(isopkt); 1061 return -EINVAL; 1062 } 1063 totlen += isopkt[u].length; 1064 } 1065 if (totlen > 32768) { 1066 kfree(isopkt); 1067 return -EINVAL; 1068 } 1069 uurb->buffer_length = totlen; 1070 snoop(&ps->dev->dev, "iso urb\n"); 1071 break; 1072 1073 case USBDEVFS_URB_TYPE_INTERRUPT: 1074 uurb->number_of_packets = 0; 1075 if (!usb_endpoint_xfer_int(&ep->desc)) 1076 return -EINVAL; 1077 if (uurb->buffer_length > MAX_USBFS_BUFFER_SIZE) 1078 return -EINVAL; 1079 if (!access_ok(is_in ? VERIFY_WRITE : VERIFY_READ, 1080 uurb->buffer, uurb->buffer_length)) 1081 return -EFAULT; 1082 snoop(&ps->dev->dev, "interrupt urb\n"); 1083 break; 1084 1085 default: 1086 return -EINVAL; 1087 } 1088 as = alloc_async(uurb->number_of_packets); 1089 if (!as) { 1090 kfree(isopkt); 1091 kfree(dr); 1092 return -ENOMEM; 1093 } 1094 as->urb->transfer_buffer = kmalloc(uurb->buffer_length, GFP_KERNEL); 1095 if (!as->urb->transfer_buffer) { 1096 kfree(isopkt); 1097 kfree(dr); 1098 free_async(as); 1099 return -ENOMEM; 1100 } 1101 as->urb->dev = ps->dev; 1102 as->urb->pipe = (uurb->type << 30) | 1103 __create_pipe(ps->dev, uurb->endpoint & 0xf) | 1104 (uurb->endpoint & USB_DIR_IN); 1105 as->urb->transfer_flags = uurb->flags | 1106 (is_in ? URB_DIR_IN : URB_DIR_OUT); 1107 as->urb->transfer_buffer_length = uurb->buffer_length; 1108 as->urb->setup_packet = (unsigned char *)dr; 1109 as->urb->start_frame = uurb->start_frame; 1110 as->urb->number_of_packets = uurb->number_of_packets; 1111 if (uurb->type == USBDEVFS_URB_TYPE_ISO || 1112 ps->dev->speed == USB_SPEED_HIGH) 1113 as->urb->interval = 1 << min(15, ep->desc.bInterval - 1); 1114 else 1115 as->urb->interval = ep->desc.bInterval; 1116 as->urb->context = as; 1117 as->urb->complete = async_completed; 1118 for (totlen = u = 0; u < uurb->number_of_packets; u++) { 1119 as->urb->iso_frame_desc[u].offset = totlen; 1120 as->urb->iso_frame_desc[u].length = isopkt[u].length; 1121 totlen += isopkt[u].length; 1122 } 1123 kfree(isopkt); 1124 as->ps = ps; 1125 as->userurb = arg; 1126 if (uurb->endpoint & USB_DIR_IN) 1127 as->userbuffer = uurb->buffer; 1128 else 1129 as->userbuffer = NULL; 1130 as->signr = uurb->signr; 1131 as->ifnum = ifnum; 1132 as->pid = get_pid(task_pid(current)); 1133 as->uid = current->uid; 1134 as->euid = current->euid; 1135 security_task_getsecid(current, &as->secid); 1136 if (!is_in) { 1137 if (copy_from_user(as->urb->transfer_buffer, uurb->buffer, 1138 as->urb->transfer_buffer_length)) { 1139 free_async(as); 1140 return -EFAULT; 1141 } 1142 } 1143 snoop_urb(as->urb, as->userurb); 1144 async_newpending(as); 1145 if ((ret = usb_submit_urb(as->urb, GFP_KERNEL))) { 1146 dev_printk(KERN_DEBUG, &ps->dev->dev, 1147 "usbfs: usb_submit_urb returned %d\n", ret); 1148 async_removepending(as); 1149 free_async(as); 1150 return ret; 1151 } 1152 return 0; 1153 } 1154 1155 static int proc_submiturb(struct dev_state *ps, void __user *arg) 1156 { 1157 struct usbdevfs_urb uurb; 1158 1159 if (copy_from_user(&uurb, arg, sizeof(uurb))) 1160 return -EFAULT; 1161 1162 return proc_do_submiturb(ps, &uurb, 1163 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc), 1164 arg); 1165 } 1166 1167 static int proc_unlinkurb(struct dev_state *ps, void __user *arg) 1168 { 1169 struct async *as; 1170 1171 as = async_getpending(ps, arg); 1172 if (!as) 1173 return -EINVAL; 1174 usb_kill_urb(as->urb); 1175 return 0; 1176 } 1177 1178 static int processcompl(struct async *as, void __user * __user *arg) 1179 { 1180 struct urb *urb = as->urb; 1181 struct usbdevfs_urb __user *userurb = as->userurb; 1182 void __user *addr = as->userurb; 1183 unsigned int i; 1184 1185 if (as->userbuffer) 1186 if (copy_to_user(as->userbuffer, urb->transfer_buffer, 1187 urb->transfer_buffer_length)) 1188 return -EFAULT; 1189 if (put_user(as->status, &userurb->status)) 1190 return -EFAULT; 1191 if (put_user(urb->actual_length, &userurb->actual_length)) 1192 return -EFAULT; 1193 if (put_user(urb->error_count, &userurb->error_count)) 1194 return -EFAULT; 1195 1196 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 1197 for (i = 0; i < urb->number_of_packets; i++) { 1198 if (put_user(urb->iso_frame_desc[i].actual_length, 1199 &userurb->iso_frame_desc[i].actual_length)) 1200 return -EFAULT; 1201 if (put_user(urb->iso_frame_desc[i].status, 1202 &userurb->iso_frame_desc[i].status)) 1203 return -EFAULT; 1204 } 1205 } 1206 1207 free_async(as); 1208 1209 if (put_user(addr, (void __user * __user *)arg)) 1210 return -EFAULT; 1211 return 0; 1212 } 1213 1214 static struct async *reap_as(struct dev_state *ps) 1215 { 1216 DECLARE_WAITQUEUE(wait, current); 1217 struct async *as = NULL; 1218 struct usb_device *dev = ps->dev; 1219 1220 add_wait_queue(&ps->wait, &wait); 1221 for (;;) { 1222 __set_current_state(TASK_INTERRUPTIBLE); 1223 as = async_getcompleted(ps); 1224 if (as) 1225 break; 1226 if (signal_pending(current)) 1227 break; 1228 usb_unlock_device(dev); 1229 schedule(); 1230 usb_lock_device(dev); 1231 } 1232 remove_wait_queue(&ps->wait, &wait); 1233 set_current_state(TASK_RUNNING); 1234 return as; 1235 } 1236 1237 static int proc_reapurb(struct dev_state *ps, void __user *arg) 1238 { 1239 struct async *as = reap_as(ps); 1240 if (as) 1241 return processcompl(as, (void __user * __user *)arg); 1242 if (signal_pending(current)) 1243 return -EINTR; 1244 return -EIO; 1245 } 1246 1247 static int proc_reapurbnonblock(struct dev_state *ps, void __user *arg) 1248 { 1249 struct async *as; 1250 1251 if (!(as = async_getcompleted(ps))) 1252 return -EAGAIN; 1253 return processcompl(as, (void __user * __user *)arg); 1254 } 1255 1256 #ifdef CONFIG_COMPAT 1257 1258 static int get_urb32(struct usbdevfs_urb *kurb, 1259 struct usbdevfs_urb32 __user *uurb) 1260 { 1261 __u32 uptr; 1262 if (get_user(kurb->type, &uurb->type) || 1263 __get_user(kurb->endpoint, &uurb->endpoint) || 1264 __get_user(kurb->status, &uurb->status) || 1265 __get_user(kurb->flags, &uurb->flags) || 1266 __get_user(kurb->buffer_length, &uurb->buffer_length) || 1267 __get_user(kurb->actual_length, &uurb->actual_length) || 1268 __get_user(kurb->start_frame, &uurb->start_frame) || 1269 __get_user(kurb->number_of_packets, &uurb->number_of_packets) || 1270 __get_user(kurb->error_count, &uurb->error_count) || 1271 __get_user(kurb->signr, &uurb->signr)) 1272 return -EFAULT; 1273 1274 if (__get_user(uptr, &uurb->buffer)) 1275 return -EFAULT; 1276 kurb->buffer = compat_ptr(uptr); 1277 if (__get_user(uptr, &uurb->buffer)) 1278 return -EFAULT; 1279 kurb->usercontext = compat_ptr(uptr); 1280 1281 return 0; 1282 } 1283 1284 static int proc_submiturb_compat(struct dev_state *ps, void __user *arg) 1285 { 1286 struct usbdevfs_urb uurb; 1287 1288 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg)) 1289 return -EFAULT; 1290 1291 return proc_do_submiturb(ps, &uurb, 1292 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc, 1293 arg); 1294 } 1295 1296 static int processcompl_compat(struct async *as, void __user * __user *arg) 1297 { 1298 struct urb *urb = as->urb; 1299 struct usbdevfs_urb32 __user *userurb = as->userurb; 1300 void __user *addr = as->userurb; 1301 unsigned int i; 1302 1303 if (as->userbuffer) 1304 if (copy_to_user(as->userbuffer, urb->transfer_buffer, 1305 urb->transfer_buffer_length)) 1306 return -EFAULT; 1307 if (put_user(as->status, &userurb->status)) 1308 return -EFAULT; 1309 if (put_user(urb->actual_length, &userurb->actual_length)) 1310 return -EFAULT; 1311 if (put_user(urb->error_count, &userurb->error_count)) 1312 return -EFAULT; 1313 1314 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) { 1315 for (i = 0; i < urb->number_of_packets; i++) { 1316 if (put_user(urb->iso_frame_desc[i].actual_length, 1317 &userurb->iso_frame_desc[i].actual_length)) 1318 return -EFAULT; 1319 if (put_user(urb->iso_frame_desc[i].status, 1320 &userurb->iso_frame_desc[i].status)) 1321 return -EFAULT; 1322 } 1323 } 1324 1325 free_async(as); 1326 if (put_user(ptr_to_compat(addr), (u32 __user *)arg)) 1327 return -EFAULT; 1328 return 0; 1329 } 1330 1331 static int proc_reapurb_compat(struct dev_state *ps, void __user *arg) 1332 { 1333 struct async *as = reap_as(ps); 1334 if (as) 1335 return processcompl_compat(as, (void __user * __user *)arg); 1336 if (signal_pending(current)) 1337 return -EINTR; 1338 return -EIO; 1339 } 1340 1341 static int proc_reapurbnonblock_compat(struct dev_state *ps, void __user *arg) 1342 { 1343 struct async *as; 1344 1345 if (!(as = async_getcompleted(ps))) 1346 return -EAGAIN; 1347 return processcompl_compat(as, (void __user * __user *)arg); 1348 } 1349 1350 #endif 1351 1352 static int proc_disconnectsignal(struct dev_state *ps, void __user *arg) 1353 { 1354 struct usbdevfs_disconnectsignal ds; 1355 1356 if (copy_from_user(&ds, arg, sizeof(ds))) 1357 return -EFAULT; 1358 if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX)) 1359 return -EINVAL; 1360 ps->discsignr = ds.signr; 1361 ps->disccontext = ds.context; 1362 return 0; 1363 } 1364 1365 static int proc_claiminterface(struct dev_state *ps, void __user *arg) 1366 { 1367 unsigned int ifnum; 1368 1369 if (get_user(ifnum, (unsigned int __user *)arg)) 1370 return -EFAULT; 1371 return claimintf(ps, ifnum); 1372 } 1373 1374 static int proc_releaseinterface(struct dev_state *ps, void __user *arg) 1375 { 1376 unsigned int ifnum; 1377 int ret; 1378 1379 if (get_user(ifnum, (unsigned int __user *)arg)) 1380 return -EFAULT; 1381 if ((ret = releaseintf(ps, ifnum)) < 0) 1382 return ret; 1383 destroy_async_on_interface (ps, ifnum); 1384 return 0; 1385 } 1386 1387 static int proc_ioctl(struct dev_state *ps, struct usbdevfs_ioctl *ctl) 1388 { 1389 int size; 1390 void *buf = NULL; 1391 int retval = 0; 1392 struct usb_interface *intf = NULL; 1393 struct usb_driver *driver = NULL; 1394 1395 /* alloc buffer */ 1396 if ((size = _IOC_SIZE(ctl->ioctl_code)) > 0) { 1397 if ((buf = kmalloc(size, GFP_KERNEL)) == NULL) 1398 return -ENOMEM; 1399 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) { 1400 if (copy_from_user(buf, ctl->data, size)) { 1401 kfree(buf); 1402 return -EFAULT; 1403 } 1404 } else { 1405 memset(buf, 0, size); 1406 } 1407 } 1408 1409 if (!connected(ps)) { 1410 kfree(buf); 1411 return -ENODEV; 1412 } 1413 1414 if (ps->dev->state != USB_STATE_CONFIGURED) 1415 retval = -EHOSTUNREACH; 1416 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno))) 1417 retval = -EINVAL; 1418 else switch (ctl->ioctl_code) { 1419 1420 /* disconnect kernel driver from interface */ 1421 case USBDEVFS_DISCONNECT: 1422 if (intf->dev.driver) { 1423 driver = to_usb_driver(intf->dev.driver); 1424 dev_dbg(&intf->dev, "disconnect by usbfs\n"); 1425 usb_driver_release_interface(driver, intf); 1426 } else 1427 retval = -ENODATA; 1428 break; 1429 1430 /* let kernel drivers try to (re)bind to the interface */ 1431 case USBDEVFS_CONNECT: 1432 if (!intf->dev.driver) 1433 retval = device_attach(&intf->dev); 1434 else 1435 retval = -EBUSY; 1436 break; 1437 1438 /* talk directly to the interface's driver */ 1439 default: 1440 if (intf->dev.driver) 1441 driver = to_usb_driver(intf->dev.driver); 1442 if (driver == NULL || driver->ioctl == NULL) { 1443 retval = -ENOTTY; 1444 } else { 1445 retval = driver->ioctl(intf, ctl->ioctl_code, buf); 1446 if (retval == -ENOIOCTLCMD) 1447 retval = -ENOTTY; 1448 } 1449 } 1450 1451 /* cleanup and return */ 1452 if (retval >= 0 1453 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0 1454 && size > 0 1455 && copy_to_user(ctl->data, buf, size) != 0) 1456 retval = -EFAULT; 1457 1458 kfree(buf); 1459 return retval; 1460 } 1461 1462 static int proc_ioctl_default(struct dev_state *ps, void __user *arg) 1463 { 1464 struct usbdevfs_ioctl ctrl; 1465 1466 if (copy_from_user(&ctrl, arg, sizeof(ctrl))) 1467 return -EFAULT; 1468 return proc_ioctl(ps, &ctrl); 1469 } 1470 1471 #ifdef CONFIG_COMPAT 1472 static int proc_ioctl_compat(struct dev_state *ps, compat_uptr_t arg) 1473 { 1474 struct usbdevfs_ioctl32 __user *uioc; 1475 struct usbdevfs_ioctl ctrl; 1476 u32 udata; 1477 1478 uioc = compat_ptr((long)arg); 1479 if (get_user(ctrl.ifno, &uioc->ifno) || 1480 get_user(ctrl.ioctl_code, &uioc->ioctl_code) || 1481 __get_user(udata, &uioc->data)) 1482 return -EFAULT; 1483 ctrl.data = compat_ptr(udata); 1484 1485 return proc_ioctl(ps, &ctrl); 1486 } 1487 #endif 1488 1489 /* 1490 * NOTE: All requests here that have interface numbers as parameters 1491 * are assuming that somehow the configuration has been prevented from 1492 * changing. But there's no mechanism to ensure that... 1493 */ 1494 static int usbdev_ioctl(struct inode *inode, struct file *file, 1495 unsigned int cmd, unsigned long arg) 1496 { 1497 struct dev_state *ps = file->private_data; 1498 struct usb_device *dev = ps->dev; 1499 void __user *p = (void __user *)arg; 1500 int ret = -ENOTTY; 1501 1502 if (!(file->f_mode & FMODE_WRITE)) 1503 return -EPERM; 1504 usb_lock_device(dev); 1505 if (!connected(ps)) { 1506 usb_unlock_device(dev); 1507 return -ENODEV; 1508 } 1509 1510 switch (cmd) { 1511 case USBDEVFS_CONTROL: 1512 snoop(&dev->dev, "%s: CONTROL\n", __FUNCTION__); 1513 ret = proc_control(ps, p); 1514 if (ret >= 0) 1515 inode->i_mtime = CURRENT_TIME; 1516 break; 1517 1518 case USBDEVFS_BULK: 1519 snoop(&dev->dev, "%s: BULK\n", __FUNCTION__); 1520 ret = proc_bulk(ps, p); 1521 if (ret >= 0) 1522 inode->i_mtime = CURRENT_TIME; 1523 break; 1524 1525 case USBDEVFS_RESETEP: 1526 snoop(&dev->dev, "%s: RESETEP\n", __FUNCTION__); 1527 ret = proc_resetep(ps, p); 1528 if (ret >= 0) 1529 inode->i_mtime = CURRENT_TIME; 1530 break; 1531 1532 case USBDEVFS_RESET: 1533 snoop(&dev->dev, "%s: RESET\n", __FUNCTION__); 1534 ret = proc_resetdevice(ps); 1535 break; 1536 1537 case USBDEVFS_CLEAR_HALT: 1538 snoop(&dev->dev, "%s: CLEAR_HALT\n", __FUNCTION__); 1539 ret = proc_clearhalt(ps, p); 1540 if (ret >= 0) 1541 inode->i_mtime = CURRENT_TIME; 1542 break; 1543 1544 case USBDEVFS_GETDRIVER: 1545 snoop(&dev->dev, "%s: GETDRIVER\n", __FUNCTION__); 1546 ret = proc_getdriver(ps, p); 1547 break; 1548 1549 case USBDEVFS_CONNECTINFO: 1550 snoop(&dev->dev, "%s: CONNECTINFO\n", __FUNCTION__); 1551 ret = proc_connectinfo(ps, p); 1552 break; 1553 1554 case USBDEVFS_SETINTERFACE: 1555 snoop(&dev->dev, "%s: SETINTERFACE\n", __FUNCTION__); 1556 ret = proc_setintf(ps, p); 1557 break; 1558 1559 case USBDEVFS_SETCONFIGURATION: 1560 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __FUNCTION__); 1561 ret = proc_setconfig(ps, p); 1562 break; 1563 1564 case USBDEVFS_SUBMITURB: 1565 snoop(&dev->dev, "%s: SUBMITURB\n", __FUNCTION__); 1566 ret = proc_submiturb(ps, p); 1567 if (ret >= 0) 1568 inode->i_mtime = CURRENT_TIME; 1569 break; 1570 1571 #ifdef CONFIG_COMPAT 1572 1573 case USBDEVFS_SUBMITURB32: 1574 snoop(&dev->dev, "%s: SUBMITURB32\n", __FUNCTION__); 1575 ret = proc_submiturb_compat(ps, p); 1576 if (ret >= 0) 1577 inode->i_mtime = CURRENT_TIME; 1578 break; 1579 1580 case USBDEVFS_REAPURB32: 1581 snoop(&dev->dev, "%s: REAPURB32\n", __FUNCTION__); 1582 ret = proc_reapurb_compat(ps, p); 1583 break; 1584 1585 case USBDEVFS_REAPURBNDELAY32: 1586 snoop(&dev->dev, "%s: REAPURBDELAY32\n", __FUNCTION__); 1587 ret = proc_reapurbnonblock_compat(ps, p); 1588 break; 1589 1590 case USBDEVFS_IOCTL32: 1591 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__); 1592 ret = proc_ioctl_compat(ps, ptr_to_compat(p)); 1593 break; 1594 #endif 1595 1596 case USBDEVFS_DISCARDURB: 1597 snoop(&dev->dev, "%s: DISCARDURB\n", __FUNCTION__); 1598 ret = proc_unlinkurb(ps, p); 1599 break; 1600 1601 case USBDEVFS_REAPURB: 1602 snoop(&dev->dev, "%s: REAPURB\n", __FUNCTION__); 1603 ret = proc_reapurb(ps, p); 1604 break; 1605 1606 case USBDEVFS_REAPURBNDELAY: 1607 snoop(&dev->dev, "%s: REAPURBDELAY\n", __FUNCTION__); 1608 ret = proc_reapurbnonblock(ps, p); 1609 break; 1610 1611 case USBDEVFS_DISCSIGNAL: 1612 snoop(&dev->dev, "%s: DISCSIGNAL\n", __FUNCTION__); 1613 ret = proc_disconnectsignal(ps, p); 1614 break; 1615 1616 case USBDEVFS_CLAIMINTERFACE: 1617 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __FUNCTION__); 1618 ret = proc_claiminterface(ps, p); 1619 break; 1620 1621 case USBDEVFS_RELEASEINTERFACE: 1622 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __FUNCTION__); 1623 ret = proc_releaseinterface(ps, p); 1624 break; 1625 1626 case USBDEVFS_IOCTL: 1627 snoop(&dev->dev, "%s: IOCTL\n", __FUNCTION__); 1628 ret = proc_ioctl_default(ps, p); 1629 break; 1630 } 1631 usb_unlock_device(dev); 1632 if (ret >= 0) 1633 inode->i_atime = CURRENT_TIME; 1634 return ret; 1635 } 1636 1637 /* No kernel lock - fine */ 1638 static unsigned int usbdev_poll(struct file *file, 1639 struct poll_table_struct *wait) 1640 { 1641 struct dev_state *ps = file->private_data; 1642 unsigned int mask = 0; 1643 1644 poll_wait(file, &ps->wait, wait); 1645 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed)) 1646 mask |= POLLOUT | POLLWRNORM; 1647 if (!connected(ps)) 1648 mask |= POLLERR | POLLHUP; 1649 return mask; 1650 } 1651 1652 const struct file_operations usbdev_file_operations = { 1653 .owner = THIS_MODULE, 1654 .llseek = usbdev_lseek, 1655 .read = usbdev_read, 1656 .poll = usbdev_poll, 1657 .ioctl = usbdev_ioctl, 1658 .open = usbdev_open, 1659 .release = usbdev_release, 1660 }; 1661 1662 #ifdef CONFIG_USB_DEVICE_CLASS 1663 static struct class *usb_classdev_class; 1664 1665 static int usb_classdev_add(struct usb_device *dev) 1666 { 1667 int minor = ((dev->bus->busnum-1) * 128) + (dev->devnum-1); 1668 1669 dev->usb_classdev = device_create(usb_classdev_class, &dev->dev, 1670 MKDEV(USB_DEVICE_MAJOR, minor), 1671 "usbdev%d.%d", dev->bus->busnum, dev->devnum); 1672 if (IS_ERR(dev->usb_classdev)) 1673 return PTR_ERR(dev->usb_classdev); 1674 1675 return 0; 1676 } 1677 1678 static void usb_classdev_remove(struct usb_device *dev) 1679 { 1680 device_unregister(dev->usb_classdev); 1681 } 1682 1683 static int usb_classdev_notify(struct notifier_block *self, 1684 unsigned long action, void *dev) 1685 { 1686 switch (action) { 1687 case USB_DEVICE_ADD: 1688 if (usb_classdev_add(dev)) 1689 return NOTIFY_BAD; 1690 break; 1691 case USB_DEVICE_REMOVE: 1692 usb_classdev_remove(dev); 1693 break; 1694 } 1695 return NOTIFY_OK; 1696 } 1697 1698 static struct notifier_block usbdev_nb = { 1699 .notifier_call = usb_classdev_notify, 1700 }; 1701 #endif 1702 1703 static struct cdev usb_device_cdev; 1704 1705 int __init usb_devio_init(void) 1706 { 1707 int retval; 1708 1709 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX, 1710 "usb_device"); 1711 if (retval) { 1712 err("unable to register minors for usb_device"); 1713 goto out; 1714 } 1715 cdev_init(&usb_device_cdev, &usbdev_file_operations); 1716 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX); 1717 if (retval) { 1718 err("unable to get usb_device major %d", USB_DEVICE_MAJOR); 1719 goto error_cdev; 1720 } 1721 #ifdef CONFIG_USB_DEVICE_CLASS 1722 usb_classdev_class = class_create(THIS_MODULE, "usb_device"); 1723 if (IS_ERR(usb_classdev_class)) { 1724 err("unable to register usb_device class"); 1725 retval = PTR_ERR(usb_classdev_class); 1726 cdev_del(&usb_device_cdev); 1727 usb_classdev_class = NULL; 1728 goto out; 1729 } 1730 1731 usb_register_notify(&usbdev_nb); 1732 #endif 1733 out: 1734 return retval; 1735 1736 error_cdev: 1737 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 1738 goto out; 1739 } 1740 1741 void usb_devio_cleanup(void) 1742 { 1743 #ifdef CONFIG_USB_DEVICE_CLASS 1744 usb_unregister_notify(&usbdev_nb); 1745 class_destroy(usb_classdev_class); 1746 #endif 1747 cdev_del(&usb_device_cdev); 1748 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX); 1749 } 1750