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dt-bindings: mtd: ingenic: Use standard ecc-engine property
[linux/fpc-iii.git] / drivers / usb / core / devio.c
blobfa783531ee889140d580e19a489cede393f12a10
1 // SPDX-License-Identifier: GPL-2.0+
2 /*****************************************************************************/
3
4 /*
5 * devio.c -- User space communication with USB devices.
6 *
7 * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
8 *
9 * This file implements the usbfs/x/y files, where
10 * x is the bus number and y the device number.
11 *
12 * It allows user space programs/"drivers" to communicate directly
13 * with USB devices without intervening kernel driver.
14 *
15 * Revision history
16 * 22.12.1999 0.1 Initial release (split from proc_usb.c)
17 * 04.01.2000 0.2 Turned into its own filesystem
18 * 30.09.2005 0.3 Fix user-triggerable oops in async URB delivery
19 * (CAN-2005-3055)
20 */
21
22 /*****************************************************************************/
23
24 #include <linux/fs.h>
25 #include <linux/mm.h>
26 #include <linux/sched/signal.h>
27 #include <linux/slab.h>
28 #include <linux/signal.h>
29 #include <linux/poll.h>
30 #include <linux/module.h>
31 #include <linux/string.h>
32 #include <linux/usb.h>
33 #include <linux/usbdevice_fs.h>
34 #include <linux/usb/hcd.h> /* for usbcore internals */
35 #include <linux/cdev.h>
36 #include <linux/notifier.h>
37 #include <linux/security.h>
38 #include <linux/user_namespace.h>
39 #include <linux/scatterlist.h>
40 #include <linux/uaccess.h>
41 #include <linux/dma-mapping.h>
42 #include <asm/byteorder.h>
43 #include <linux/moduleparam.h>
44
45 #include "usb.h"
46
47 #define USB_MAXBUS 64
48 #define USB_DEVICE_MAX (USB_MAXBUS * 128)
49 #define USB_SG_SIZE 16384 /* split-size for large txs */
50
51 /* Mutual exclusion for removal, open, and release */
52 DEFINE_MUTEX(usbfs_mutex);
53
54 struct usb_dev_state {
55 struct list_head list; /* state list */
56 struct usb_device *dev;
57 struct file *file;
58 spinlock_t lock; /* protects the async urb lists */
59 struct list_head async_pending;
60 struct list_head async_completed;
61 struct list_head memory_list;
62 wait_queue_head_t wait; /* wake up if a request completed */
63 unsigned int discsignr;
64 struct pid *disc_pid;
65 const struct cred *cred;
66 void __user *disccontext;
67 unsigned long ifclaimed;
68 u32 disabled_bulk_eps;
69 bool privileges_dropped;
70 unsigned long interface_allowed_mask;
71 };
72
73 struct usb_memory {
74 struct list_head memlist;
75 int vma_use_count;
76 int urb_use_count;
77 u32 size;
78 void *mem;
79 dma_addr_t dma_handle;
80 unsigned long vm_start;
81 struct usb_dev_state *ps;
82 };
83
84 struct async {
85 struct list_head asynclist;
86 struct usb_dev_state *ps;
87 struct pid *pid;
88 const struct cred *cred;
89 unsigned int signr;
90 unsigned int ifnum;
91 void __user *userbuffer;
92 void __user *userurb;
93 struct urb *urb;
94 struct usb_memory *usbm;
95 unsigned int mem_usage;
96 int status;
97 u8 bulk_addr;
98 u8 bulk_status;
99 };
100
101 static bool usbfs_snoop;
102 module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
103 MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
104
105 static unsigned usbfs_snoop_max = 65536;
106 module_param(usbfs_snoop_max, uint, S_IRUGO | S_IWUSR);
107 MODULE_PARM_DESC(usbfs_snoop_max,
108 "maximum number of bytes to print while snooping");
109
110 #define snoop(dev, format, arg...) \
111 do { \
112 if (usbfs_snoop) \
113 dev_info(dev, format, ## arg); \
114 } while (0)
115
116 enum snoop_when {
117 SUBMIT, COMPLETE
118 };
119
120 #define USB_DEVICE_DEV MKDEV(USB_DEVICE_MAJOR, 0)
121
122 /* Limit on the total amount of memory we can allocate for transfers */
123 static u32 usbfs_memory_mb = 16;
124 module_param(usbfs_memory_mb, uint, 0644);
125 MODULE_PARM_DESC(usbfs_memory_mb,
126 "maximum MB allowed for usbfs buffers (0 = no limit)");
127
128 /* Hard limit, necessary to avoid arithmetic overflow */
129 #define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
130
131 static atomic64_t usbfs_memory_usage; /* Total memory currently allocated */
132
133 /* Check whether it's okay to allocate more memory for a transfer */
134 static int usbfs_increase_memory_usage(u64 amount)
135 {
136 u64 lim;
137
138 lim = READ_ONCE(usbfs_memory_mb);
139 lim <<= 20;
140
141 atomic64_add(amount, &usbfs_memory_usage);
142
143 if (lim > 0 && atomic64_read(&usbfs_memory_usage) > lim) {
144 atomic64_sub(amount, &usbfs_memory_usage);
145 return -ENOMEM;
146 }
147
148 return 0;
149 }
150
151 /* Memory for a transfer is being deallocated */
152 static void usbfs_decrease_memory_usage(u64 amount)
153 {
154 atomic64_sub(amount, &usbfs_memory_usage);
155 }
156
157 static int connected(struct usb_dev_state *ps)
158 {
159 return (!list_empty(&ps->list) &&
160 ps->dev->state != USB_STATE_NOTATTACHED);
161 }
162
163 static void dec_usb_memory_use_count(struct usb_memory *usbm, int *count)
164 {
165 struct usb_dev_state *ps = usbm->ps;
166 unsigned long flags;
167
168 spin_lock_irqsave(&ps->lock, flags);
169 --*count;
170 if (usbm->urb_use_count == 0 && usbm->vma_use_count == 0) {
171 list_del(&usbm->memlist);
172 spin_unlock_irqrestore(&ps->lock, flags);
173
174 usb_free_coherent(ps->dev, usbm->size, usbm->mem,
175 usbm->dma_handle);
176 usbfs_decrease_memory_usage(
177 usbm->size + sizeof(struct usb_memory));
178 kfree(usbm);
179 } else {
180 spin_unlock_irqrestore(&ps->lock, flags);
181 }
182 }
183
184 static void usbdev_vm_open(struct vm_area_struct *vma)
185 {
186 struct usb_memory *usbm = vma->vm_private_data;
187 unsigned long flags;
188
189 spin_lock_irqsave(&usbm->ps->lock, flags);
190 ++usbm->vma_use_count;
191 spin_unlock_irqrestore(&usbm->ps->lock, flags);
192 }
193
194 static void usbdev_vm_close(struct vm_area_struct *vma)
195 {
196 struct usb_memory *usbm = vma->vm_private_data;
197
198 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
199 }
200
201 static const struct vm_operations_struct usbdev_vm_ops = {
202 .open = usbdev_vm_open,
203 .close = usbdev_vm_close
204 };
205
206 static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
207 {
208 struct usb_memory *usbm = NULL;
209 struct usb_dev_state *ps = file->private_data;
210 size_t size = vma->vm_end - vma->vm_start;
211 void *mem;
212 unsigned long flags;
213 dma_addr_t dma_handle;
214 int ret;
215
216 ret = usbfs_increase_memory_usage(size + sizeof(struct usb_memory));
217 if (ret)
218 goto error;
219
220 usbm = kzalloc(sizeof(struct usb_memory), GFP_KERNEL);
221 if (!usbm) {
222 ret = -ENOMEM;
223 goto error_decrease_mem;
224 }
225
226 mem = usb_alloc_coherent(ps->dev, size, GFP_USER | __GFP_NOWARN,
227 &dma_handle);
228 if (!mem) {
229 ret = -ENOMEM;
230 goto error_free_usbm;
231 }
232
233 memset(mem, 0, size);
234
235 usbm->mem = mem;
236 usbm->dma_handle = dma_handle;
237 usbm->size = size;
238 usbm->ps = ps;
239 usbm->vm_start = vma->vm_start;
240 usbm->vma_use_count = 1;
241 INIT_LIST_HEAD(&usbm->memlist);
242
243 if (remap_pfn_range(vma, vma->vm_start,
244 virt_to_phys(usbm->mem) >> PAGE_SHIFT,
245 size, vma->vm_page_prot) < 0) {
246 dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
247 return -EAGAIN;
248 }
249
250 vma->vm_flags |= VM_IO;
251 vma->vm_flags |= (VM_DONTEXPAND | VM_DONTDUMP);
252 vma->vm_ops = &usbdev_vm_ops;
253 vma->vm_private_data = usbm;
254
255 spin_lock_irqsave(&ps->lock, flags);
256 list_add_tail(&usbm->memlist, &ps->memory_list);
257 spin_unlock_irqrestore(&ps->lock, flags);
258
259 return 0;
260
261 error_free_usbm:
262 kfree(usbm);
263 error_decrease_mem:
264 usbfs_decrease_memory_usage(size + sizeof(struct usb_memory));
265 error:
266 return ret;
267 }
268
269 static ssize_t usbdev_read(struct file *file, char __user *buf, size_t nbytes,
270 loff_t *ppos)
271 {
272 struct usb_dev_state *ps = file->private_data;
273 struct usb_device *dev = ps->dev;
274 ssize_t ret = 0;
275 unsigned len;
276 loff_t pos;
277 int i;
278
279 pos = *ppos;
280 usb_lock_device(dev);
281 if (!connected(ps)) {
282 ret = -ENODEV;
283 goto err;
284 } else if (pos < 0) {
285 ret = -EINVAL;
286 goto err;
287 }
288
289 if (pos < sizeof(struct usb_device_descriptor)) {
290 /* 18 bytes - fits on the stack */
291 struct usb_device_descriptor temp_desc;
292
293 memcpy(&temp_desc, &dev->descriptor, sizeof(dev->descriptor));
294 le16_to_cpus(&temp_desc.bcdUSB);
295 le16_to_cpus(&temp_desc.idVendor);
296 le16_to_cpus(&temp_desc.idProduct);
297 le16_to_cpus(&temp_desc.bcdDevice);
298
299 len = sizeof(struct usb_device_descriptor) - pos;
300 if (len > nbytes)
301 len = nbytes;
302 if (copy_to_user(buf, ((char *)&temp_desc) + pos, len)) {
303 ret = -EFAULT;
304 goto err;
305 }
306
307 *ppos += len;
308 buf += len;
309 nbytes -= len;
310 ret += len;
311 }
312
313 pos = sizeof(struct usb_device_descriptor);
314 for (i = 0; nbytes && i < dev->descriptor.bNumConfigurations; i++) {
315 struct usb_config_descriptor *config =
316 (struct usb_config_descriptor *)dev->rawdescriptors[i];
317 unsigned int length = le16_to_cpu(config->wTotalLength);
318
319 if (*ppos < pos + length) {
320
321 /* The descriptor may claim to be longer than it
322 * really is. Here is the actual allocated length. */
323 unsigned alloclen =
324 le16_to_cpu(dev->config[i].desc.wTotalLength);
325
326 len = length - (*ppos - pos);
327 if (len > nbytes)
328 len = nbytes;
329
330 /* Simply don't write (skip over) unallocated parts */
331 if (alloclen > (*ppos - pos)) {
332 alloclen -= (*ppos - pos);
333 if (copy_to_user(buf,
334 dev->rawdescriptors[i] + (*ppos - pos),
335 min(len, alloclen))) {
336 ret = -EFAULT;
337 goto err;
338 }
339 }
340
341 *ppos += len;
342 buf += len;
343 nbytes -= len;
344 ret += len;
345 }
346
347 pos += length;
348 }
349
350 err:
351 usb_unlock_device(dev);
352 return ret;
353 }
354
355 /*
356 * async list handling
357 */
358
359 static struct async *alloc_async(unsigned int numisoframes)
360 {
361 struct async *as;
362
363 as = kzalloc(sizeof(struct async), GFP_KERNEL);
364 if (!as)
365 return NULL;
366 as->urb = usb_alloc_urb(numisoframes, GFP_KERNEL);
367 if (!as->urb) {
368 kfree(as);
369 return NULL;
370 }
371 return as;
372 }
373
374 static void free_async(struct async *as)
375 {
376 int i;
377
378 put_pid(as->pid);
379 if (as->cred)
380 put_cred(as->cred);
381 for (i = 0; i < as->urb->num_sgs; i++) {
382 if (sg_page(&as->urb->sg[i]))
383 kfree(sg_virt(&as->urb->sg[i]));
384 }
385
386 kfree(as->urb->sg);
387 if (as->usbm == NULL)
388 kfree(as->urb->transfer_buffer);
389 else
390 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
391
392 kfree(as->urb->setup_packet);
393 usb_free_urb(as->urb);
394 usbfs_decrease_memory_usage(as->mem_usage);
395 kfree(as);
396 }
397
398 static void async_newpending(struct async *as)
399 {
400 struct usb_dev_state *ps = as->ps;
401 unsigned long flags;
402
403 spin_lock_irqsave(&ps->lock, flags);
404 list_add_tail(&as->asynclist, &ps->async_pending);
405 spin_unlock_irqrestore(&ps->lock, flags);
406 }
407
408 static void async_removepending(struct async *as)
409 {
410 struct usb_dev_state *ps = as->ps;
411 unsigned long flags;
412
413 spin_lock_irqsave(&ps->lock, flags);
414 list_del_init(&as->asynclist);
415 spin_unlock_irqrestore(&ps->lock, flags);
416 }
417
418 static struct async *async_getcompleted(struct usb_dev_state *ps)
419 {
420 unsigned long flags;
421 struct async *as = NULL;
422
423 spin_lock_irqsave(&ps->lock, flags);
424 if (!list_empty(&ps->async_completed)) {
425 as = list_entry(ps->async_completed.next, struct async,
426 asynclist);
427 list_del_init(&as->asynclist);
428 }
429 spin_unlock_irqrestore(&ps->lock, flags);
430 return as;
431 }
432
433 static struct async *async_getpending(struct usb_dev_state *ps,
434 void __user *userurb)
435 {
436 struct async *as;
437
438 list_for_each_entry(as, &ps->async_pending, asynclist)
439 if (as->userurb == userurb) {
440 list_del_init(&as->asynclist);
441 return as;
442 }
443
444 return NULL;
445 }
446
447 static void snoop_urb(struct usb_device *udev,
448 void __user *userurb, int pipe, unsigned length,
449 int timeout_or_status, enum snoop_when when,
450 unsigned char *data, unsigned data_len)
451 {
452 static const char *types[] = {"isoc", "int", "ctrl", "bulk"};
453 static const char *dirs[] = {"out", "in"};
454 int ep;
455 const char *t, *d;
456
457 if (!usbfs_snoop)
458 return;
459
460 ep = usb_pipeendpoint(pipe);
461 t = types[usb_pipetype(pipe)];
462 d = dirs[!!usb_pipein(pipe)];
463
464 if (userurb) { /* Async */
465 if (when == SUBMIT)
466 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
467 "length %u\n",
468 userurb, ep, t, d, length);
469 else
470 dev_info(&udev->dev, "userurb %pK, ep%d %s-%s, "
471 "actual_length %u status %d\n",
472 userurb, ep, t, d, length,
473 timeout_or_status);
474 } else {
475 if (when == SUBMIT)
476 dev_info(&udev->dev, "ep%d %s-%s, length %u, "
477 "timeout %d\n",
478 ep, t, d, length, timeout_or_status);
479 else
480 dev_info(&udev->dev, "ep%d %s-%s, actual_length %u, "
481 "status %d\n",
482 ep, t, d, length, timeout_or_status);
483 }
484
485 data_len = min(data_len, usbfs_snoop_max);
486 if (data && data_len > 0) {
487 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
488 data, data_len, 1);
489 }
490 }
491
492 static void snoop_urb_data(struct urb *urb, unsigned len)
493 {
494 int i, size;
495
496 len = min(len, usbfs_snoop_max);
497 if (!usbfs_snoop || len == 0)
498 return;
499
500 if (urb->num_sgs == 0) {
501 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
502 urb->transfer_buffer, len, 1);
503 return;
504 }
505
506 for (i = 0; i < urb->num_sgs && len; i++) {
507 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
508 print_hex_dump(KERN_DEBUG, "data: ", DUMP_PREFIX_NONE, 32, 1,
509 sg_virt(&urb->sg[i]), size, 1);
510 len -= size;
511 }
512 }
513
514 static int copy_urb_data_to_user(u8 __user *userbuffer, struct urb *urb)
515 {
516 unsigned i, len, size;
517
518 if (urb->number_of_packets > 0) /* Isochronous */
519 len = urb->transfer_buffer_length;
520 else /* Non-Isoc */
521 len = urb->actual_length;
522
523 if (urb->num_sgs == 0) {
524 if (copy_to_user(userbuffer, urb->transfer_buffer, len))
525 return -EFAULT;
526 return 0;
527 }
528
529 for (i = 0; i < urb->num_sgs && len; i++) {
530 size = (len > USB_SG_SIZE) ? USB_SG_SIZE : len;
531 if (copy_to_user(userbuffer, sg_virt(&urb->sg[i]), size))
532 return -EFAULT;
533 userbuffer += size;
534 len -= size;
535 }
536
537 return 0;
538 }
539
540 #define AS_CONTINUATION 1
541 #define AS_UNLINK 2
542
543 static void cancel_bulk_urbs(struct usb_dev_state *ps, unsigned bulk_addr)
544 __releases(ps->lock)
545 __acquires(ps->lock)
546 {
547 struct urb *urb;
548 struct async *as;
549
550 /* Mark all the pending URBs that match bulk_addr, up to but not
551 * including the first one without AS_CONTINUATION. If such an
552 * URB is encountered then a new transfer has already started so
553 * the endpoint doesn't need to be disabled; otherwise it does.
554 */
555 list_for_each_entry(as, &ps->async_pending, asynclist) {
556 if (as->bulk_addr == bulk_addr) {
557 if (as->bulk_status != AS_CONTINUATION)
558 goto rescan;
559 as->bulk_status = AS_UNLINK;
560 as->bulk_addr = 0;
561 }
562 }
563 ps->disabled_bulk_eps |= (1 << bulk_addr);
564
565 /* Now carefully unlink all the marked pending URBs */
566 rescan:
567 list_for_each_entry(as, &ps->async_pending, asynclist) {
568 if (as->bulk_status == AS_UNLINK) {
569 as->bulk_status = 0; /* Only once */
570 urb = as->urb;
571 usb_get_urb(urb);
572 spin_unlock(&ps->lock); /* Allow completions */
573 usb_unlink_urb(urb);
574 usb_put_urb(urb);
575 spin_lock(&ps->lock);
576 goto rescan;
577 }
578 }
579 }
580
581 static void async_completed(struct urb *urb)
582 {
583 struct async *as = urb->context;
584 struct usb_dev_state *ps = as->ps;
585 struct kernel_siginfo sinfo;
586 struct pid *pid = NULL;
587 const struct cred *cred = NULL;
588 unsigned long flags;
589 int signr;
590
591 spin_lock_irqsave(&ps->lock, flags);
592 list_move_tail(&as->asynclist, &ps->async_completed);
593 as->status = urb->status;
594 signr = as->signr;
595 if (signr) {
596 clear_siginfo(&sinfo);
597 sinfo.si_signo = as->signr;
598 sinfo.si_errno = as->status;
599 sinfo.si_code = SI_ASYNCIO;
600 sinfo.si_addr = as->userurb;
601 pid = get_pid(as->pid);
602 cred = get_cred(as->cred);
603 }
604 snoop(&urb->dev->dev, "urb complete\n");
605 snoop_urb(urb->dev, as->userurb, urb->pipe, urb->actual_length,
606 as->status, COMPLETE, NULL, 0);
607 if (usb_urb_dir_in(urb))
608 snoop_urb_data(urb, urb->actual_length);
609
610 if (as->status < 0 && as->bulk_addr && as->status != -ECONNRESET &&
611 as->status != -ENOENT)
612 cancel_bulk_urbs(ps, as->bulk_addr);
613
614 wake_up(&ps->wait);
615 spin_unlock_irqrestore(&ps->lock, flags);
616
617 if (signr) {
618 kill_pid_info_as_cred(sinfo.si_signo, &sinfo, pid, cred);
619 put_pid(pid);
620 put_cred(cred);
621 }
622 }
623
624 static void destroy_async(struct usb_dev_state *ps, struct list_head *list)
625 {
626 struct urb *urb;
627 struct async *as;
628 unsigned long flags;
629
630 spin_lock_irqsave(&ps->lock, flags);
631 while (!list_empty(list)) {
632 as = list_entry(list->next, struct async, asynclist);
633 list_del_init(&as->asynclist);
634 urb = as->urb;
635 usb_get_urb(urb);
636
637 /* drop the spinlock so the completion handler can run */
638 spin_unlock_irqrestore(&ps->lock, flags);
639 usb_kill_urb(urb);
640 usb_put_urb(urb);
641 spin_lock_irqsave(&ps->lock, flags);
642 }
643 spin_unlock_irqrestore(&ps->lock, flags);
644 }
645
646 static void destroy_async_on_interface(struct usb_dev_state *ps,
647 unsigned int ifnum)
648 {
649 struct list_head *p, *q, hitlist;
650 unsigned long flags;
651
652 INIT_LIST_HEAD(&hitlist);
653 spin_lock_irqsave(&ps->lock, flags);
654 list_for_each_safe(p, q, &ps->async_pending)
655 if (ifnum == list_entry(p, struct async, asynclist)->ifnum)
656 list_move_tail(p, &hitlist);
657 spin_unlock_irqrestore(&ps->lock, flags);
658 destroy_async(ps, &hitlist);
659 }
660
661 static void destroy_all_async(struct usb_dev_state *ps)
662 {
663 destroy_async(ps, &ps->async_pending);
664 }
665
666 /*
667 * interface claims are made only at the request of user level code,
668 * which can also release them (explicitly or by closing files).
669 * they're also undone when devices disconnect.
670 */
671
672 static int driver_probe(struct usb_interface *intf,
673 const struct usb_device_id *id)
674 {
675 return -ENODEV;
676 }
677
678 static void driver_disconnect(struct usb_interface *intf)
679 {
680 struct usb_dev_state *ps = usb_get_intfdata(intf);
681 unsigned int ifnum = intf->altsetting->desc.bInterfaceNumber;
682
683 if (!ps)
684 return;
685
686 /* NOTE: this relies on usbcore having canceled and completed
687 * all pending I/O requests; 2.6 does that.
688 */
689
690 if (likely(ifnum < 8*sizeof(ps->ifclaimed)))
691 clear_bit(ifnum, &ps->ifclaimed);
692 else
693 dev_warn(&intf->dev, "interface number %u out of range\n",
694 ifnum);
695
696 usb_set_intfdata(intf, NULL);
697
698 /* force async requests to complete */
699 destroy_async_on_interface(ps, ifnum);
700 }
701
702 /* The following routines are merely placeholders. There is no way
703 * to inform a user task about suspend or resumes.
704 */
705 static int driver_suspend(struct usb_interface *intf, pm_message_t msg)
706 {
707 return 0;
708 }
709
710 static int driver_resume(struct usb_interface *intf)
711 {
712 return 0;
713 }
714
715 struct usb_driver usbfs_driver = {
716 .name = "usbfs",
717 .probe = driver_probe,
718 .disconnect = driver_disconnect,
719 .suspend = driver_suspend,
720 .resume = driver_resume,
721 };
722
723 static int claimintf(struct usb_dev_state *ps, unsigned int ifnum)
724 {
725 struct usb_device *dev = ps->dev;
726 struct usb_interface *intf;
727 int err;
728
729 if (ifnum >= 8*sizeof(ps->ifclaimed))
730 return -EINVAL;
731 /* already claimed */
732 if (test_bit(ifnum, &ps->ifclaimed))
733 return 0;
734
735 if (ps->privileges_dropped &&
736 !test_bit(ifnum, &ps->interface_allowed_mask))
737 return -EACCES;
738
739 intf = usb_ifnum_to_if(dev, ifnum);
740 if (!intf)
741 err = -ENOENT;
742 else
743 err = usb_driver_claim_interface(&usbfs_driver, intf, ps);
744 if (err == 0)
745 set_bit(ifnum, &ps->ifclaimed);
746 return err;
747 }
748
749 static int releaseintf(struct usb_dev_state *ps, unsigned int ifnum)
750 {
751 struct usb_device *dev;
752 struct usb_interface *intf;
753 int err;
754
755 err = -EINVAL;
756 if (ifnum >= 8*sizeof(ps->ifclaimed))
757 return err;
758 dev = ps->dev;
759 intf = usb_ifnum_to_if(dev, ifnum);
760 if (!intf)
761 err = -ENOENT;
762 else if (test_and_clear_bit(ifnum, &ps->ifclaimed)) {
763 usb_driver_release_interface(&usbfs_driver, intf);
764 err = 0;
765 }
766 return err;
767 }
768
769 static int checkintf(struct usb_dev_state *ps, unsigned int ifnum)
770 {
771 if (ps->dev->state != USB_STATE_CONFIGURED)
772 return -EHOSTUNREACH;
773 if (ifnum >= 8*sizeof(ps->ifclaimed))
774 return -EINVAL;
775 if (test_bit(ifnum, &ps->ifclaimed))
776 return 0;
777 /* if not yet claimed, claim it for the driver */
778 dev_warn(&ps->dev->dev, "usbfs: process %d (%s) did not claim "
779 "interface %u before use\n", task_pid_nr(current),
780 current->comm, ifnum);
781 return claimintf(ps, ifnum);
782 }
783
784 static int findintfep(struct usb_device *dev, unsigned int ep)
785 {
786 unsigned int i, j, e;
787 struct usb_interface *intf;
788 struct usb_host_interface *alts;
789 struct usb_endpoint_descriptor *endpt;
790
791 if (ep & ~(USB_DIR_IN|0xf))
792 return -EINVAL;
793 if (!dev->actconfig)
794 return -ESRCH;
795 for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
796 intf = dev->actconfig->interface[i];
797 for (j = 0; j < intf->num_altsetting; j++) {
798 alts = &intf->altsetting[j];
799 for (e = 0; e < alts->desc.bNumEndpoints; e++) {
800 endpt = &alts->endpoint[e].desc;
801 if (endpt->bEndpointAddress == ep)
802 return alts->desc.bInterfaceNumber;
803 }
804 }
805 }
806 return -ENOENT;
807 }
808
809 static int check_ctrlrecip(struct usb_dev_state *ps, unsigned int requesttype,
810 unsigned int request, unsigned int index)
811 {
812 int ret = 0;
813 struct usb_host_interface *alt_setting;
814
815 if (ps->dev->state != USB_STATE_UNAUTHENTICATED
816 && ps->dev->state != USB_STATE_ADDRESS
817 && ps->dev->state != USB_STATE_CONFIGURED)
818 return -EHOSTUNREACH;
819 if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
820 return 0;
821
822 /*
823 * check for the special corner case 'get_device_id' in the printer
824 * class specification, which we always want to allow as it is used
825 * to query things like ink level, etc.
826 */
827 if (requesttype == 0xa1 && request == 0) {
828 alt_setting = usb_find_alt_setting(ps->dev->actconfig,
829 index >> 8, index & 0xff);
830 if (alt_setting
831 && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER)
832 return 0;
833 }
834
835 index &= 0xff;
836 switch (requesttype & USB_RECIP_MASK) {
837 case USB_RECIP_ENDPOINT:
838 if ((index & ~USB_DIR_IN) == 0)
839 return 0;
840 ret = findintfep(ps->dev, index);
841 if (ret < 0) {
842 /*
843 * Some not fully compliant Win apps seem to get
844 * index wrong and have the endpoint number here
845 * rather than the endpoint address (with the
846 * correct direction). Win does let this through,
847 * so we'll not reject it here but leave it to
848 * the device to not break KVM. But we warn.
849 */
850 ret = findintfep(ps->dev, index ^ 0x80);
851 if (ret >= 0)
852 dev_info(&ps->dev->dev,
853 "%s: process %i (%s) requesting ep %02x but needs %02x\n",
854 __func__, task_pid_nr(current),
855 current->comm, index, index ^ 0x80);
856 }
857 if (ret >= 0)
858 ret = checkintf(ps, ret);
859 break;
860
861 case USB_RECIP_INTERFACE:
862 ret = checkintf(ps, index);
863 break;
864 }
865 return ret;
866 }
867
868 static struct usb_host_endpoint *ep_to_host_endpoint(struct usb_device *dev,
869 unsigned char ep)
870 {
871 if (ep & USB_ENDPOINT_DIR_MASK)
872 return dev->ep_in[ep & USB_ENDPOINT_NUMBER_MASK];
873 else
874 return dev->ep_out[ep & USB_ENDPOINT_NUMBER_MASK];
875 }
876
877 static int parse_usbdevfs_streams(struct usb_dev_state *ps,
878 struct usbdevfs_streams __user *streams,
879 unsigned int *num_streams_ret,
880 unsigned int *num_eps_ret,
881 struct usb_host_endpoint ***eps_ret,
882 struct usb_interface **intf_ret)
883 {
884 unsigned int i, num_streams, num_eps;
885 struct usb_host_endpoint **eps;
886 struct usb_interface *intf = NULL;
887 unsigned char ep;
888 int ifnum, ret;
889
890 if (get_user(num_streams, &streams->num_streams) ||
891 get_user(num_eps, &streams->num_eps))
892 return -EFAULT;
893
894 if (num_eps < 1 || num_eps > USB_MAXENDPOINTS)
895 return -EINVAL;
896
897 /* The XHCI controller allows max 2 ^ 16 streams */
898 if (num_streams_ret && (num_streams < 2 || num_streams > 65536))
899 return -EINVAL;
900
901 eps = kmalloc_array(num_eps, sizeof(*eps), GFP_KERNEL);
902 if (!eps)
903 return -ENOMEM;
904
905 for (i = 0; i < num_eps; i++) {
906 if (get_user(ep, &streams->eps[i])) {
907 ret = -EFAULT;
908 goto error;
909 }
910 eps[i] = ep_to_host_endpoint(ps->dev, ep);
911 if (!eps[i]) {
912 ret = -EINVAL;
913 goto error;
914 }
915
916 /* usb_alloc/free_streams operate on an usb_interface */
917 ifnum = findintfep(ps->dev, ep);
918 if (ifnum < 0) {
919 ret = ifnum;
920 goto error;
921 }
922
923 if (i == 0) {
924 ret = checkintf(ps, ifnum);
925 if (ret < 0)
926 goto error;
927 intf = usb_ifnum_to_if(ps->dev, ifnum);
928 } else {
929 /* Verify all eps belong to the same interface */
930 if (ifnum != intf->altsetting->desc.bInterfaceNumber) {
931 ret = -EINVAL;
932 goto error;
933 }
934 }
935 }
936
937 if (num_streams_ret)
938 *num_streams_ret = num_streams;
939 *num_eps_ret = num_eps;
940 *eps_ret = eps;
941 *intf_ret = intf;
942
943 return 0;
944
945 error:
946 kfree(eps);
947 return ret;
948 }
949
950 static int match_devt(struct device *dev, void *data)
951 {
952 return dev->devt == (dev_t) (unsigned long) data;
953 }
954
955 static struct usb_device *usbdev_lookup_by_devt(dev_t devt)
956 {
957 struct device *dev;
958
959 dev = bus_find_device(&usb_bus_type, NULL,
960 (void *) (unsigned long) devt, match_devt);
961 if (!dev)
962 return NULL;
963 return to_usb_device(dev);
964 }
965
966 /*
967 * file operations
968 */
969 static int usbdev_open(struct inode *inode, struct file *file)
970 {
971 struct usb_device *dev = NULL;
972 struct usb_dev_state *ps;
973 int ret;
974
975 ret = -ENOMEM;
976 ps = kzalloc(sizeof(struct usb_dev_state), GFP_KERNEL);
977 if (!ps)
978 goto out_free_ps;
979
980 ret = -ENODEV;
981
982 /* Protect against simultaneous removal or release */
983 mutex_lock(&usbfs_mutex);
984
985 /* usbdev device-node */
986 if (imajor(inode) == USB_DEVICE_MAJOR)
987 dev = usbdev_lookup_by_devt(inode->i_rdev);
988
989 mutex_unlock(&usbfs_mutex);
990
991 if (!dev)
992 goto out_free_ps;
993
994 usb_lock_device(dev);
995 if (dev->state == USB_STATE_NOTATTACHED)
996 goto out_unlock_device;
997
998 ret = usb_autoresume_device(dev);
999 if (ret)
1000 goto out_unlock_device;
1001
1002 ps->dev = dev;
1003 ps->file = file;
1004 ps->interface_allowed_mask = 0xFFFFFFFF; /* 32 bits */
1005 spin_lock_init(&ps->lock);
1006 INIT_LIST_HEAD(&ps->list);
1007 INIT_LIST_HEAD(&ps->async_pending);
1008 INIT_LIST_HEAD(&ps->async_completed);
1009 INIT_LIST_HEAD(&ps->memory_list);
1010 init_waitqueue_head(&ps->wait);
1011 ps->disc_pid = get_pid(task_pid(current));
1012 ps->cred = get_current_cred();
1013 smp_wmb();
1014 list_add_tail(&ps->list, &dev->filelist);
1015 file->private_data = ps;
1016 usb_unlock_device(dev);
1017 snoop(&dev->dev, "opened by process %d: %s\n", task_pid_nr(current),
1018 current->comm);
1019 return ret;
1020
1021 out_unlock_device:
1022 usb_unlock_device(dev);
1023 usb_put_dev(dev);
1024 out_free_ps:
1025 kfree(ps);
1026 return ret;
1027 }
1028
1029 static int usbdev_release(struct inode *inode, struct file *file)
1030 {
1031 struct usb_dev_state *ps = file->private_data;
1032 struct usb_device *dev = ps->dev;
1033 unsigned int ifnum;
1034 struct async *as;
1035
1036 usb_lock_device(dev);
1037 usb_hub_release_all_ports(dev, ps);
1038
1039 list_del_init(&ps->list);
1040
1041 for (ifnum = 0; ps->ifclaimed && ifnum < 8*sizeof(ps->ifclaimed);
1042 ifnum++) {
1043 if (test_bit(ifnum, &ps->ifclaimed))
1044 releaseintf(ps, ifnum);
1045 }
1046 destroy_all_async(ps);
1047 usb_autosuspend_device(dev);
1048 usb_unlock_device(dev);
1049 usb_put_dev(dev);
1050 put_pid(ps->disc_pid);
1051 put_cred(ps->cred);
1052
1053 as = async_getcompleted(ps);
1054 while (as) {
1055 free_async(as);
1056 as = async_getcompleted(ps);
1057 }
1058
1059 kfree(ps);
1060 return 0;
1061 }
1062
1063 static int proc_control(struct usb_dev_state *ps, void __user *arg)
1064 {
1065 struct usb_device *dev = ps->dev;
1066 struct usbdevfs_ctrltransfer ctrl;
1067 unsigned int tmo;
1068 unsigned char *tbuf;
1069 unsigned wLength;
1070 int i, pipe, ret;
1071
1072 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
1073 return -EFAULT;
1074 ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest,
1075 ctrl.wIndex);
1076 if (ret)
1077 return ret;
1078 wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */
1079 if (wLength > PAGE_SIZE)
1080 return -EINVAL;
1081 ret = usbfs_increase_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1082 sizeof(struct usb_ctrlrequest));
1083 if (ret)
1084 return ret;
1085 tbuf = (unsigned char *)__get_free_page(GFP_KERNEL);
1086 if (!tbuf) {
1087 ret = -ENOMEM;
1088 goto done;
1089 }
1090 tmo = ctrl.timeout;
1091 snoop(&dev->dev, "control urb: bRequestType=%02x "
1092 "bRequest=%02x wValue=%04x "
1093 "wIndex=%04x wLength=%04x\n",
1094 ctrl.bRequestType, ctrl.bRequest, ctrl.wValue,
1095 ctrl.wIndex, ctrl.wLength);
1096 if (ctrl.bRequestType & 0x80) {
1097 if (ctrl.wLength && !access_ok(ctrl.data,
1098 ctrl.wLength)) {
1099 ret = -EINVAL;
1100 goto done;
1101 }
1102 pipe = usb_rcvctrlpipe(dev, 0);
1103 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT, NULL, 0);
1104
1105 usb_unlock_device(dev);
1106 i = usb_control_msg(dev, pipe, ctrl.bRequest,
1107 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1108 tbuf, ctrl.wLength, tmo);
1109 usb_lock_device(dev);
1110 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE,
1111 tbuf, max(i, 0));
1112 if ((i > 0) && ctrl.wLength) {
1113 if (copy_to_user(ctrl.data, tbuf, i)) {
1114 ret = -EFAULT;
1115 goto done;
1116 }
1117 }
1118 } else {
1119 if (ctrl.wLength) {
1120 if (copy_from_user(tbuf, ctrl.data, ctrl.wLength)) {
1121 ret = -EFAULT;
1122 goto done;
1123 }
1124 }
1125 pipe = usb_sndctrlpipe(dev, 0);
1126 snoop_urb(dev, NULL, pipe, ctrl.wLength, tmo, SUBMIT,
1127 tbuf, ctrl.wLength);
1128
1129 usb_unlock_device(dev);
1130 i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.bRequest,
1131 ctrl.bRequestType, ctrl.wValue, ctrl.wIndex,
1132 tbuf, ctrl.wLength, tmo);
1133 usb_lock_device(dev);
1134 snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, NULL, 0);
1135 }
1136 if (i < 0 && i != -EPIPE) {
1137 dev_printk(KERN_DEBUG, &dev->dev, "usbfs: USBDEVFS_CONTROL "
1138 "failed cmd %s rqt %u rq %u len %u ret %d\n",
1139 current->comm, ctrl.bRequestType, ctrl.bRequest,
1140 ctrl.wLength, i);
1141 }
1142 ret = i;
1143 done:
1144 free_page((unsigned long) tbuf);
1145 usbfs_decrease_memory_usage(PAGE_SIZE + sizeof(struct urb) +
1146 sizeof(struct usb_ctrlrequest));
1147 return ret;
1148 }
1149
1150 static int proc_bulk(struct usb_dev_state *ps, void __user *arg)
1151 {
1152 struct usb_device *dev = ps->dev;
1153 struct usbdevfs_bulktransfer bulk;
1154 unsigned int tmo, len1, pipe;
1155 int len2;
1156 unsigned char *tbuf;
1157 int i, ret;
1158
1159 if (copy_from_user(&bulk, arg, sizeof(bulk)))
1160 return -EFAULT;
1161 ret = findintfep(ps->dev, bulk.ep);
1162 if (ret < 0)
1163 return ret;
1164 ret = checkintf(ps, ret);
1165 if (ret)
1166 return ret;
1167 if (bulk.ep & USB_DIR_IN)
1168 pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
1169 else
1170 pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
1171 if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
1172 return -EINVAL;
1173 len1 = bulk.len;
1174 if (len1 >= (INT_MAX - sizeof(struct urb)))
1175 return -EINVAL;
1176 ret = usbfs_increase_memory_usage(len1 + sizeof(struct urb));
1177 if (ret)
1178 return ret;
1179 tbuf = kmalloc(len1, GFP_KERNEL);
1180 if (!tbuf) {
1181 ret = -ENOMEM;
1182 goto done;
1183 }
1184 tmo = bulk.timeout;
1185 if (bulk.ep & 0x80) {
1186 if (len1 && !access_ok(bulk.data, len1)) {
1187 ret = -EINVAL;
1188 goto done;
1189 }
1190 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, NULL, 0);
1191
1192 usb_unlock_device(dev);
1193 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1194 usb_lock_device(dev);
1195 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, tbuf, len2);
1196
1197 if (!i && len2) {
1198 if (copy_to_user(bulk.data, tbuf, len2)) {
1199 ret = -EFAULT;
1200 goto done;
1201 }
1202 }
1203 } else {
1204 if (len1) {
1205 if (copy_from_user(tbuf, bulk.data, len1)) {
1206 ret = -EFAULT;
1207 goto done;
1208 }
1209 }
1210 snoop_urb(dev, NULL, pipe, len1, tmo, SUBMIT, tbuf, len1);
1211
1212 usb_unlock_device(dev);
1213 i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
1214 usb_lock_device(dev);
1215 snoop_urb(dev, NULL, pipe, len2, i, COMPLETE, NULL, 0);
1216 }
1217 ret = (i < 0 ? i : len2);
1218 done:
1219 kfree(tbuf);
1220 usbfs_decrease_memory_usage(len1 + sizeof(struct urb));
1221 return ret;
1222 }
1223
1224 static void check_reset_of_active_ep(struct usb_device *udev,
1225 unsigned int epnum, char *ioctl_name)
1226 {
1227 struct usb_host_endpoint **eps;
1228 struct usb_host_endpoint *ep;
1229
1230 eps = (epnum & USB_DIR_IN) ? udev->ep_in : udev->ep_out;
1231 ep = eps[epnum & 0x0f];
1232 if (ep && !list_empty(&ep->urb_list))
1233 dev_warn(&udev->dev, "Process %d (%s) called USBDEVFS_%s for active endpoint 0x%02x\n",
1234 task_pid_nr(current), current->comm,
1235 ioctl_name, epnum);
1236 }
1237
1238 static int proc_resetep(struct usb_dev_state *ps, void __user *arg)
1239 {
1240 unsigned int ep;
1241 int ret;
1242
1243 if (get_user(ep, (unsigned int __user *)arg))
1244 return -EFAULT;
1245 ret = findintfep(ps->dev, ep);
1246 if (ret < 0)
1247 return ret;
1248 ret = checkintf(ps, ret);
1249 if (ret)
1250 return ret;
1251 check_reset_of_active_ep(ps->dev, ep, "RESETEP");
1252 usb_reset_endpoint(ps->dev, ep);
1253 return 0;
1254 }
1255
1256 static int proc_clearhalt(struct usb_dev_state *ps, void __user *arg)
1257 {
1258 unsigned int ep;
1259 int pipe;
1260 int ret;
1261
1262 if (get_user(ep, (unsigned int __user *)arg))
1263 return -EFAULT;
1264 ret = findintfep(ps->dev, ep);
1265 if (ret < 0)
1266 return ret;
1267 ret = checkintf(ps, ret);
1268 if (ret)
1269 return ret;
1270 check_reset_of_active_ep(ps->dev, ep, "CLEAR_HALT");
1271 if (ep & USB_DIR_IN)
1272 pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
1273 else
1274 pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
1275
1276 return usb_clear_halt(ps->dev, pipe);
1277 }
1278
1279 static int proc_getdriver(struct usb_dev_state *ps, void __user *arg)
1280 {
1281 struct usbdevfs_getdriver gd;
1282 struct usb_interface *intf;
1283 int ret;
1284
1285 if (copy_from_user(&gd, arg, sizeof(gd)))
1286 return -EFAULT;
1287 intf = usb_ifnum_to_if(ps->dev, gd.interface);
1288 if (!intf || !intf->dev.driver)
1289 ret = -ENODATA;
1290 else {
1291 strlcpy(gd.driver, intf->dev.driver->name,
1292 sizeof(gd.driver));
1293 ret = (copy_to_user(arg, &gd, sizeof(gd)) ? -EFAULT : 0);
1294 }
1295 return ret;
1296 }
1297
1298 static int proc_connectinfo(struct usb_dev_state *ps, void __user *arg)
1299 {
1300 struct usbdevfs_connectinfo ci;
1301
1302 memset(&ci, 0, sizeof(ci));
1303 ci.devnum = ps->dev->devnum;
1304 ci.slow = ps->dev->speed == USB_SPEED_LOW;
1305
1306 if (copy_to_user(arg, &ci, sizeof(ci)))
1307 return -EFAULT;
1308 return 0;
1309 }
1310
1311 static int proc_resetdevice(struct usb_dev_state *ps)
1312 {
1313 struct usb_host_config *actconfig = ps->dev->actconfig;
1314 struct usb_interface *interface;
1315 int i, number;
1316
1317 /* Don't allow a device reset if the process has dropped the
1318 * privilege to do such things and any of the interfaces are
1319 * currently claimed.
1320 */
1321 if (ps->privileges_dropped && actconfig) {
1322 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1323 interface = actconfig->interface[i];
1324 number = interface->cur_altsetting->desc.bInterfaceNumber;
1325 if (usb_interface_claimed(interface) &&
1326 !test_bit(number, &ps->ifclaimed)) {
1327 dev_warn(&ps->dev->dev,
1328 "usbfs: interface %d claimed by %s while '%s' resets device\n",
1329 number, interface->dev.driver->name, current->comm);
1330 return -EACCES;
1331 }
1332 }
1333 }
1334
1335 return usb_reset_device(ps->dev);
1336 }
1337
1338 static int proc_setintf(struct usb_dev_state *ps, void __user *arg)
1339 {
1340 struct usbdevfs_setinterface setintf;
1341 int ret;
1342
1343 if (copy_from_user(&setintf, arg, sizeof(setintf)))
1344 return -EFAULT;
1345 ret = checkintf(ps, setintf.interface);
1346 if (ret)
1347 return ret;
1348
1349 destroy_async_on_interface(ps, setintf.interface);
1350
1351 return usb_set_interface(ps->dev, setintf.interface,
1352 setintf.altsetting);
1353 }
1354
1355 static int proc_setconfig(struct usb_dev_state *ps, void __user *arg)
1356 {
1357 int u;
1358 int status = 0;
1359 struct usb_host_config *actconfig;
1360
1361 if (get_user(u, (int __user *)arg))
1362 return -EFAULT;
1363
1364 actconfig = ps->dev->actconfig;
1365
1366 /* Don't touch the device if any interfaces are claimed.
1367 * It could interfere with other drivers' operations, and if
1368 * an interface is claimed by usbfs it could easily deadlock.
1369 */
1370 if (actconfig) {
1371 int i;
1372
1373 for (i = 0; i < actconfig->desc.bNumInterfaces; ++i) {
1374 if (usb_interface_claimed(actconfig->interface[i])) {
1375 dev_warn(&ps->dev->dev,
1376 "usbfs: interface %d claimed by %s "
1377 "while '%s' sets config #%d\n",
1378 actconfig->interface[i]
1379 ->cur_altsetting
1380 ->desc.bInterfaceNumber,
1381 actconfig->interface[i]
1382 ->dev.driver->name,
1383 current->comm, u);
1384 status = -EBUSY;
1385 break;
1386 }
1387 }
1388 }
1389
1390 /* SET_CONFIGURATION is often abused as a "cheap" driver reset,
1391 * so avoid usb_set_configuration()'s kick to sysfs
1392 */
1393 if (status == 0) {
1394 if (actconfig && actconfig->desc.bConfigurationValue == u)
1395 status = usb_reset_configuration(ps->dev);
1396 else
1397 status = usb_set_configuration(ps->dev, u);
1398 }
1399
1400 return status;
1401 }
1402
1403 static struct usb_memory *
1404 find_memory_area(struct usb_dev_state *ps, const struct usbdevfs_urb *uurb)
1405 {
1406 struct usb_memory *usbm = NULL, *iter;
1407 unsigned long flags;
1408 unsigned long uurb_start = (unsigned long)uurb->buffer;
1409
1410 spin_lock_irqsave(&ps->lock, flags);
1411 list_for_each_entry(iter, &ps->memory_list, memlist) {
1412 if (uurb_start >= iter->vm_start &&
1413 uurb_start < iter->vm_start + iter->size) {
1414 if (uurb->buffer_length > iter->vm_start + iter->size -
1415 uurb_start) {
1416 usbm = ERR_PTR(-EINVAL);
1417 } else {
1418 usbm = iter;
1419 usbm->urb_use_count++;
1420 }
1421 break;
1422 }
1423 }
1424 spin_unlock_irqrestore(&ps->lock, flags);
1425 return usbm;
1426 }
1427
1428 static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb,
1429 struct usbdevfs_iso_packet_desc __user *iso_frame_desc,
1430 void __user *arg)
1431 {
1432 struct usbdevfs_iso_packet_desc *isopkt = NULL;
1433 struct usb_host_endpoint *ep;
1434 struct async *as = NULL;
1435 struct usb_ctrlrequest *dr = NULL;
1436 unsigned int u, totlen, isofrmlen;
1437 int i, ret, num_sgs = 0, ifnum = -1;
1438 int number_of_packets = 0;
1439 unsigned int stream_id = 0;
1440 void *buf;
1441 bool is_in;
1442 bool allow_short = false;
1443 bool allow_zero = false;
1444 unsigned long mask = USBDEVFS_URB_SHORT_NOT_OK |
1445 USBDEVFS_URB_BULK_CONTINUATION |
1446 USBDEVFS_URB_NO_FSBR |
1447 USBDEVFS_URB_ZERO_PACKET |
1448 USBDEVFS_URB_NO_INTERRUPT;
1449 /* USBDEVFS_URB_ISO_ASAP is a special case */
1450 if (uurb->type == USBDEVFS_URB_TYPE_ISO)
1451 mask |= USBDEVFS_URB_ISO_ASAP;
1452
1453 if (uurb->flags & ~mask)
1454 return -EINVAL;
1455
1456 if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
1457 return -EINVAL;
1458 if (uurb->buffer_length > 0 && !uurb->buffer)
1459 return -EINVAL;
1460 if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
1461 (uurb->endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
1462 ifnum = findintfep(ps->dev, uurb->endpoint);
1463 if (ifnum < 0)
1464 return ifnum;
1465 ret = checkintf(ps, ifnum);
1466 if (ret)
1467 return ret;
1468 }
1469 ep = ep_to_host_endpoint(ps->dev, uurb->endpoint);
1470 if (!ep)
1471 return -ENOENT;
1472 is_in = (uurb->endpoint & USB_ENDPOINT_DIR_MASK) != 0;
1473
1474 u = 0;
1475 switch (uurb->type) {
1476 case USBDEVFS_URB_TYPE_CONTROL:
1477 if (!usb_endpoint_xfer_control(&ep->desc))
1478 return -EINVAL;
1479 /* min 8 byte setup packet */
1480 if (uurb->buffer_length < 8)
1481 return -EINVAL;
1482 dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
1483 if (!dr)
1484 return -ENOMEM;
1485 if (copy_from_user(dr, uurb->buffer, 8)) {
1486 ret = -EFAULT;
1487 goto error;
1488 }
1489 if (uurb->buffer_length < (le16_to_cpup(&dr->wLength) + 8)) {
1490 ret = -EINVAL;
1491 goto error;
1492 }
1493 ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest,
1494 le16_to_cpup(&dr->wIndex));
1495 if (ret)
1496 goto error;
1497 uurb->buffer_length = le16_to_cpup(&dr->wLength);
1498 uurb->buffer += 8;
1499 if ((dr->bRequestType & USB_DIR_IN) && uurb->buffer_length) {
1500 is_in = 1;
1501 uurb->endpoint |= USB_DIR_IN;
1502 } else {
1503 is_in = 0;
1504 uurb->endpoint &= ~USB_DIR_IN;
1505 }
1506 if (is_in)
1507 allow_short = true;
1508 snoop(&ps->dev->dev, "control urb: bRequestType=%02x "
1509 "bRequest=%02x wValue=%04x "
1510 "wIndex=%04x wLength=%04x\n",
1511 dr->bRequestType, dr->bRequest,
1512 __le16_to_cpup(&dr->wValue),
1513 __le16_to_cpup(&dr->wIndex),
1514 __le16_to_cpup(&dr->wLength));
1515 u = sizeof(struct usb_ctrlrequest);
1516 break;
1517
1518 case USBDEVFS_URB_TYPE_BULK:
1519 if (!is_in)
1520 allow_zero = true;
1521 else
1522 allow_short = true;
1523 switch (usb_endpoint_type(&ep->desc)) {
1524 case USB_ENDPOINT_XFER_CONTROL:
1525 case USB_ENDPOINT_XFER_ISOC:
1526 return -EINVAL;
1527 case USB_ENDPOINT_XFER_INT:
1528 /* allow single-shot interrupt transfers */
1529 uurb->type = USBDEVFS_URB_TYPE_INTERRUPT;
1530 goto interrupt_urb;
1531 }
1532 num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);
1533 if (num_sgs == 1 || num_sgs > ps->dev->bus->sg_tablesize)
1534 num_sgs = 0;
1535 if (ep->streams)
1536 stream_id = uurb->stream_id;
1537 break;
1538
1539 case USBDEVFS_URB_TYPE_INTERRUPT:
1540 if (!usb_endpoint_xfer_int(&ep->desc))
1541 return -EINVAL;
1542 interrupt_urb:
1543 if (!is_in)
1544 allow_zero = true;
1545 else
1546 allow_short = true;
1547 break;
1548
1549 case USBDEVFS_URB_TYPE_ISO:
1550 /* arbitrary limit */
1551 if (uurb->number_of_packets < 1 ||
1552 uurb->number_of_packets > 128)
1553 return -EINVAL;
1554 if (!usb_endpoint_xfer_isoc(&ep->desc))
1555 return -EINVAL;
1556 number_of_packets = uurb->number_of_packets;
1557 isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) *
1558 number_of_packets;
1559 isopkt = memdup_user(iso_frame_desc, isofrmlen);
1560 if (IS_ERR(isopkt)) {
1561 ret = PTR_ERR(isopkt);
1562 isopkt = NULL;
1563 goto error;
1564 }
1565 for (totlen = u = 0; u < number_of_packets; u++) {
1566 /*
1567 * arbitrary limit need for USB 3.1 Gen2
1568 * sizemax: 96 DPs at SSP, 96 * 1024 = 98304
1569 */
1570 if (isopkt[u].length > 98304) {
1571 ret = -EINVAL;
1572 goto error;
1573 }
1574 totlen += isopkt[u].length;
1575 }
1576 u *= sizeof(struct usb_iso_packet_descriptor);
1577 uurb->buffer_length = totlen;
1578 break;
1579
1580 default:
1581 return -EINVAL;
1582 }
1583
1584 if (uurb->buffer_length > 0 &&
1585 !access_ok(uurb->buffer, uurb->buffer_length)) {
1586 ret = -EFAULT;
1587 goto error;
1588 }
1589 as = alloc_async(number_of_packets);
1590 if (!as) {
1591 ret = -ENOMEM;
1592 goto error;
1593 }
1594
1595 as->usbm = find_memory_area(ps, uurb);
1596 if (IS_ERR(as->usbm)) {
1597 ret = PTR_ERR(as->usbm);
1598 as->usbm = NULL;
1599 goto error;
1600 }
1601
1602 /* do not use SG buffers when memory mapped segments
1603 * are in use
1604 */
1605 if (as->usbm)
1606 num_sgs = 0;
1607
1608 u += sizeof(struct async) + sizeof(struct urb) + uurb->buffer_length +
1609 num_sgs * sizeof(struct scatterlist);
1610 ret = usbfs_increase_memory_usage(u);
1611 if (ret)
1612 goto error;
1613 as->mem_usage = u;
1614
1615 if (num_sgs) {
1616 as->urb->sg = kmalloc_array(num_sgs,
1617 sizeof(struct scatterlist),
1618 GFP_KERNEL);
1619 if (!as->urb->sg) {
1620 ret = -ENOMEM;
1621 goto error;
1622 }
1623 as->urb->num_sgs = num_sgs;
1624 sg_init_table(as->urb->sg, as->urb->num_sgs);
1625
1626 totlen = uurb->buffer_length;
1627 for (i = 0; i < as->urb->num_sgs; i++) {
1628 u = (totlen > USB_SG_SIZE) ? USB_SG_SIZE : totlen;
1629 buf = kmalloc(u, GFP_KERNEL);
1630 if (!buf) {
1631 ret = -ENOMEM;
1632 goto error;
1633 }
1634 sg_set_buf(&as->urb->sg[i], buf, u);
1635
1636 if (!is_in) {
1637 if (copy_from_user(buf, uurb->buffer, u)) {
1638 ret = -EFAULT;
1639 goto error;
1640 }
1641 uurb->buffer += u;
1642 }
1643 totlen -= u;
1644 }
1645 } else if (uurb->buffer_length > 0) {
1646 if (as->usbm) {
1647 unsigned long uurb_start = (unsigned long)uurb->buffer;
1648
1649 as->urb->transfer_buffer = as->usbm->mem +
1650 (uurb_start - as->usbm->vm_start);
1651 } else {
1652 as->urb->transfer_buffer = kmalloc(uurb->buffer_length,
1653 GFP_KERNEL);
1654 if (!as->urb->transfer_buffer) {
1655 ret = -ENOMEM;
1656 goto error;
1657 }
1658 if (!is_in) {
1659 if (copy_from_user(as->urb->transfer_buffer,
1660 uurb->buffer,
1661 uurb->buffer_length)) {
1662 ret = -EFAULT;
1663 goto error;
1664 }
1665 } else if (uurb->type == USBDEVFS_URB_TYPE_ISO) {
1666 /*
1667 * Isochronous input data may end up being
1668 * discontiguous if some of the packets are
1669 * short. Clear the buffer so that the gaps
1670 * don't leak kernel data to userspace.
1671 */
1672 memset(as->urb->transfer_buffer, 0,
1673 uurb->buffer_length);
1674 }
1675 }
1676 }
1677 as->urb->dev = ps->dev;
1678 as->urb->pipe = (uurb->type << 30) |
1679 __create_pipe(ps->dev, uurb->endpoint & 0xf) |
1680 (uurb->endpoint & USB_DIR_IN);
1681
1682 /* This tedious sequence is necessary because the URB_* flags
1683 * are internal to the kernel and subject to change, whereas
1684 * the USBDEVFS_URB_* flags are a user API and must not be changed.
1685 */
1686 u = (is_in ? URB_DIR_IN : URB_DIR_OUT);
1687 if (uurb->flags & USBDEVFS_URB_ISO_ASAP)
1688 u |= URB_ISO_ASAP;
1689 if (allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1690 u |= URB_SHORT_NOT_OK;
1691 if (allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1692 u |= URB_ZERO_PACKET;
1693 if (uurb->flags & USBDEVFS_URB_NO_INTERRUPT)
1694 u |= URB_NO_INTERRUPT;
1695 as->urb->transfer_flags = u;
1696
1697 if (!allow_short && uurb->flags & USBDEVFS_URB_SHORT_NOT_OK)
1698 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_SHORT_NOT_OK.\n");
1699 if (!allow_zero && uurb->flags & USBDEVFS_URB_ZERO_PACKET)
1700 dev_warn(&ps->dev->dev, "Requested nonsensical USBDEVFS_URB_ZERO_PACKET.\n");
1701
1702 as->urb->transfer_buffer_length = uurb->buffer_length;
1703 as->urb->setup_packet = (unsigned char *)dr;
1704 dr = NULL;
1705 as->urb->start_frame = uurb->start_frame;
1706 as->urb->number_of_packets = number_of_packets;
1707 as->urb->stream_id = stream_id;
1708
1709 if (ep->desc.bInterval) {
1710 if (uurb->type == USBDEVFS_URB_TYPE_ISO ||
1711 ps->dev->speed == USB_SPEED_HIGH ||
1712 ps->dev->speed >= USB_SPEED_SUPER)
1713 as->urb->interval = 1 <<
1714 min(15, ep->desc.bInterval - 1);
1715 else
1716 as->urb->interval = ep->desc.bInterval;
1717 }
1718
1719 as->urb->context = as;
1720 as->urb->complete = async_completed;
1721 for (totlen = u = 0; u < number_of_packets; u++) {
1722 as->urb->iso_frame_desc[u].offset = totlen;
1723 as->urb->iso_frame_desc[u].length = isopkt[u].length;
1724 totlen += isopkt[u].length;
1725 }
1726 kfree(isopkt);
1727 isopkt = NULL;
1728 as->ps = ps;
1729 as->userurb = arg;
1730 if (as->usbm) {
1731 unsigned long uurb_start = (unsigned long)uurb->buffer;
1732
1733 as->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1734 as->urb->transfer_dma = as->usbm->dma_handle +
1735 (uurb_start - as->usbm->vm_start);
1736 } else if (is_in && uurb->buffer_length > 0)
1737 as->userbuffer = uurb->buffer;
1738 as->signr = uurb->signr;
1739 as->ifnum = ifnum;
1740 as->pid = get_pid(task_pid(current));
1741 as->cred = get_current_cred();
1742 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1743 as->urb->transfer_buffer_length, 0, SUBMIT,
1744 NULL, 0);
1745 if (!is_in)
1746 snoop_urb_data(as->urb, as->urb->transfer_buffer_length);
1747
1748 async_newpending(as);
1749
1750 if (usb_endpoint_xfer_bulk(&ep->desc)) {
1751 spin_lock_irq(&ps->lock);
1752
1753 /* Not exactly the endpoint address; the direction bit is
1754 * shifted to the 0x10 position so that the value will be
1755 * between 0 and 31.
1756 */
1757 as->bulk_addr = usb_endpoint_num(&ep->desc) |
1758 ((ep->desc.bEndpointAddress & USB_ENDPOINT_DIR_MASK)
1759 >> 3);
1760
1761 /* If this bulk URB is the start of a new transfer, re-enable
1762 * the endpoint. Otherwise mark it as a continuation URB.
1763 */
1764 if (uurb->flags & USBDEVFS_URB_BULK_CONTINUATION)
1765 as->bulk_status = AS_CONTINUATION;
1766 else
1767 ps->disabled_bulk_eps &= ~(1 << as->bulk_addr);
1768
1769 /* Don't accept continuation URBs if the endpoint is
1770 * disabled because of an earlier error.
1771 */
1772 if (ps->disabled_bulk_eps & (1 << as->bulk_addr))
1773 ret = -EREMOTEIO;
1774 else
1775 ret = usb_submit_urb(as->urb, GFP_ATOMIC);
1776 spin_unlock_irq(&ps->lock);
1777 } else {
1778 ret = usb_submit_urb(as->urb, GFP_KERNEL);
1779 }
1780
1781 if (ret) {
1782 dev_printk(KERN_DEBUG, &ps->dev->dev,
1783 "usbfs: usb_submit_urb returned %d\n", ret);
1784 snoop_urb(ps->dev, as->userurb, as->urb->pipe,
1785 0, ret, COMPLETE, NULL, 0);
1786 async_removepending(as);
1787 goto error;
1788 }
1789 return 0;
1790
1791 error:
1792 if (as && as->usbm)
1793 dec_usb_memory_use_count(as->usbm, &as->usbm->urb_use_count);
1794 kfree(isopkt);
1795 kfree(dr);
1796 if (as)
1797 free_async(as);
1798 return ret;
1799 }
1800
1801 static int proc_submiturb(struct usb_dev_state *ps, void __user *arg)
1802 {
1803 struct usbdevfs_urb uurb;
1804
1805 if (copy_from_user(&uurb, arg, sizeof(uurb)))
1806 return -EFAULT;
1807
1808 return proc_do_submiturb(ps, &uurb,
1809 (((struct usbdevfs_urb __user *)arg)->iso_frame_desc),
1810 arg);
1811 }
1812
1813 static int proc_unlinkurb(struct usb_dev_state *ps, void __user *arg)
1814 {
1815 struct urb *urb;
1816 struct async *as;
1817 unsigned long flags;
1818
1819 spin_lock_irqsave(&ps->lock, flags);
1820 as = async_getpending(ps, arg);
1821 if (!as) {
1822 spin_unlock_irqrestore(&ps->lock, flags);
1823 return -EINVAL;
1824 }
1825
1826 urb = as->urb;
1827 usb_get_urb(urb);
1828 spin_unlock_irqrestore(&ps->lock, flags);
1829
1830 usb_kill_urb(urb);
1831 usb_put_urb(urb);
1832
1833 return 0;
1834 }
1835
1836 static void compute_isochronous_actual_length(struct urb *urb)
1837 {
1838 unsigned int i;
1839
1840 if (urb->number_of_packets > 0) {
1841 urb->actual_length = 0;
1842 for (i = 0; i < urb->number_of_packets; i++)
1843 urb->actual_length +=
1844 urb->iso_frame_desc[i].actual_length;
1845 }
1846 }
1847
1848 static int processcompl(struct async *as, void __user * __user *arg)
1849 {
1850 struct urb *urb = as->urb;
1851 struct usbdevfs_urb __user *userurb = as->userurb;
1852 void __user *addr = as->userurb;
1853 unsigned int i;
1854
1855 compute_isochronous_actual_length(urb);
1856 if (as->userbuffer && urb->actual_length) {
1857 if (copy_urb_data_to_user(as->userbuffer, urb))
1858 goto err_out;
1859 }
1860 if (put_user(as->status, &userurb->status))
1861 goto err_out;
1862 if (put_user(urb->actual_length, &userurb->actual_length))
1863 goto err_out;
1864 if (put_user(urb->error_count, &userurb->error_count))
1865 goto err_out;
1866
1867 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
1868 for (i = 0; i < urb->number_of_packets; i++) {
1869 if (put_user(urb->iso_frame_desc[i].actual_length,
1870 &userurb->iso_frame_desc[i].actual_length))
1871 goto err_out;
1872 if (put_user(urb->iso_frame_desc[i].status,
1873 &userurb->iso_frame_desc[i].status))
1874 goto err_out;
1875 }
1876 }
1877
1878 if (put_user(addr, (void __user * __user *)arg))
1879 return -EFAULT;
1880 return 0;
1881
1882 err_out:
1883 return -EFAULT;
1884 }
1885
1886 static struct async *reap_as(struct usb_dev_state *ps)
1887 {
1888 DECLARE_WAITQUEUE(wait, current);
1889 struct async *as = NULL;
1890 struct usb_device *dev = ps->dev;
1891
1892 add_wait_queue(&ps->wait, &wait);
1893 for (;;) {
1894 __set_current_state(TASK_INTERRUPTIBLE);
1895 as = async_getcompleted(ps);
1896 if (as || !connected(ps))
1897 break;
1898 if (signal_pending(current))
1899 break;
1900 usb_unlock_device(dev);
1901 schedule();
1902 usb_lock_device(dev);
1903 }
1904 remove_wait_queue(&ps->wait, &wait);
1905 set_current_state(TASK_RUNNING);
1906 return as;
1907 }
1908
1909 static int proc_reapurb(struct usb_dev_state *ps, void __user *arg)
1910 {
1911 struct async *as = reap_as(ps);
1912
1913 if (as) {
1914 int retval;
1915
1916 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1917 retval = processcompl(as, (void __user * __user *)arg);
1918 free_async(as);
1919 return retval;
1920 }
1921 if (signal_pending(current))
1922 return -EINTR;
1923 return -ENODEV;
1924 }
1925
1926 static int proc_reapurbnonblock(struct usb_dev_state *ps, void __user *arg)
1927 {
1928 int retval;
1929 struct async *as;
1930
1931 as = async_getcompleted(ps);
1932 if (as) {
1933 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
1934 retval = processcompl(as, (void __user * __user *)arg);
1935 free_async(as);
1936 } else {
1937 retval = (connected(ps) ? -EAGAIN : -ENODEV);
1938 }
1939 return retval;
1940 }
1941
1942 #ifdef CONFIG_COMPAT
1943 static int proc_control_compat(struct usb_dev_state *ps,
1944 struct usbdevfs_ctrltransfer32 __user *p32)
1945 {
1946 struct usbdevfs_ctrltransfer __user *p;
1947 __u32 udata;
1948 p = compat_alloc_user_space(sizeof(*p));
1949 if (copy_in_user(p, p32, (sizeof(*p32) - sizeof(compat_caddr_t))) ||
1950 get_user(udata, &p32->data) ||
1951 put_user(compat_ptr(udata), &p->data))
1952 return -EFAULT;
1953 return proc_control(ps, p);
1954 }
1955
1956 static int proc_bulk_compat(struct usb_dev_state *ps,
1957 struct usbdevfs_bulktransfer32 __user *p32)
1958 {
1959 struct usbdevfs_bulktransfer __user *p;
1960 compat_uint_t n;
1961 compat_caddr_t addr;
1962
1963 p = compat_alloc_user_space(sizeof(*p));
1964
1965 if (get_user(n, &p32->ep) || put_user(n, &p->ep) ||
1966 get_user(n, &p32->len) || put_user(n, &p->len) ||
1967 get_user(n, &p32->timeout) || put_user(n, &p->timeout) ||
1968 get_user(addr, &p32->data) || put_user(compat_ptr(addr), &p->data))
1969 return -EFAULT;
1970
1971 return proc_bulk(ps, p);
1972 }
1973 static int proc_disconnectsignal_compat(struct usb_dev_state *ps, void __user *arg)
1974 {
1975 struct usbdevfs_disconnectsignal32 ds;
1976
1977 if (copy_from_user(&ds, arg, sizeof(ds)))
1978 return -EFAULT;
1979 ps->discsignr = ds.signr;
1980 ps->disccontext = compat_ptr(ds.context);
1981 return 0;
1982 }
1983
1984 static int get_urb32(struct usbdevfs_urb *kurb,
1985 struct usbdevfs_urb32 __user *uurb)
1986 {
1987 struct usbdevfs_urb32 urb32;
1988 if (copy_from_user(&urb32, uurb, sizeof(*uurb)))
1989 return -EFAULT;
1990 kurb->type = urb32.type;
1991 kurb->endpoint = urb32.endpoint;
1992 kurb->status = urb32.status;
1993 kurb->flags = urb32.flags;
1994 kurb->buffer = compat_ptr(urb32.buffer);
1995 kurb->buffer_length = urb32.buffer_length;
1996 kurb->actual_length = urb32.actual_length;
1997 kurb->start_frame = urb32.start_frame;
1998 kurb->number_of_packets = urb32.number_of_packets;
1999 kurb->error_count = urb32.error_count;
2000 kurb->signr = urb32.signr;
2001 kurb->usercontext = compat_ptr(urb32.usercontext);
2002 return 0;
2003 }
2004
2005 static int proc_submiturb_compat(struct usb_dev_state *ps, void __user *arg)
2006 {
2007 struct usbdevfs_urb uurb;
2008
2009 if (get_urb32(&uurb, (struct usbdevfs_urb32 __user *)arg))
2010 return -EFAULT;
2011
2012 return proc_do_submiturb(ps, &uurb,
2013 ((struct usbdevfs_urb32 __user *)arg)->iso_frame_desc,
2014 arg);
2015 }
2016
2017 static int processcompl_compat(struct async *as, void __user * __user *arg)
2018 {
2019 struct urb *urb = as->urb;
2020 struct usbdevfs_urb32 __user *userurb = as->userurb;
2021 void __user *addr = as->userurb;
2022 unsigned int i;
2023
2024 compute_isochronous_actual_length(urb);
2025 if (as->userbuffer && urb->actual_length) {
2026 if (copy_urb_data_to_user(as->userbuffer, urb))
2027 return -EFAULT;
2028 }
2029 if (put_user(as->status, &userurb->status))
2030 return -EFAULT;
2031 if (put_user(urb->actual_length, &userurb->actual_length))
2032 return -EFAULT;
2033 if (put_user(urb->error_count, &userurb->error_count))
2034 return -EFAULT;
2035
2036 if (usb_endpoint_xfer_isoc(&urb->ep->desc)) {
2037 for (i = 0; i < urb->number_of_packets; i++) {
2038 if (put_user(urb->iso_frame_desc[i].actual_length,
2039 &userurb->iso_frame_desc[i].actual_length))
2040 return -EFAULT;
2041 if (put_user(urb->iso_frame_desc[i].status,
2042 &userurb->iso_frame_desc[i].status))
2043 return -EFAULT;
2044 }
2045 }
2046
2047 if (put_user(ptr_to_compat(addr), (u32 __user *)arg))
2048 return -EFAULT;
2049 return 0;
2050 }
2051
2052 static int proc_reapurb_compat(struct usb_dev_state *ps, void __user *arg)
2053 {
2054 struct async *as = reap_as(ps);
2055
2056 if (as) {
2057 int retval;
2058
2059 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2060 retval = processcompl_compat(as, (void __user * __user *)arg);
2061 free_async(as);
2062 return retval;
2063 }
2064 if (signal_pending(current))
2065 return -EINTR;
2066 return -ENODEV;
2067 }
2068
2069 static int proc_reapurbnonblock_compat(struct usb_dev_state *ps, void __user *arg)
2070 {
2071 int retval;
2072 struct async *as;
2073
2074 as = async_getcompleted(ps);
2075 if (as) {
2076 snoop(&ps->dev->dev, "reap %pK\n", as->userurb);
2077 retval = processcompl_compat(as, (void __user * __user *)arg);
2078 free_async(as);
2079 } else {
2080 retval = (connected(ps) ? -EAGAIN : -ENODEV);
2081 }
2082 return retval;
2083 }
2084
2085
2086 #endif
2087
2088 static int proc_disconnectsignal(struct usb_dev_state *ps, void __user *arg)
2089 {
2090 struct usbdevfs_disconnectsignal ds;
2091
2092 if (copy_from_user(&ds, arg, sizeof(ds)))
2093 return -EFAULT;
2094 ps->discsignr = ds.signr;
2095 ps->disccontext = ds.context;
2096 return 0;
2097 }
2098
2099 static int proc_claiminterface(struct usb_dev_state *ps, void __user *arg)
2100 {
2101 unsigned int ifnum;
2102
2103 if (get_user(ifnum, (unsigned int __user *)arg))
2104 return -EFAULT;
2105 return claimintf(ps, ifnum);
2106 }
2107
2108 static int proc_releaseinterface(struct usb_dev_state *ps, void __user *arg)
2109 {
2110 unsigned int ifnum;
2111 int ret;
2112
2113 if (get_user(ifnum, (unsigned int __user *)arg))
2114 return -EFAULT;
2115 ret = releaseintf(ps, ifnum);
2116 if (ret < 0)
2117 return ret;
2118 destroy_async_on_interface(ps, ifnum);
2119 return 0;
2120 }
2121
2122 static int proc_ioctl(struct usb_dev_state *ps, struct usbdevfs_ioctl *ctl)
2123 {
2124 int size;
2125 void *buf = NULL;
2126 int retval = 0;
2127 struct usb_interface *intf = NULL;
2128 struct usb_driver *driver = NULL;
2129
2130 if (ps->privileges_dropped)
2131 return -EACCES;
2132
2133 /* alloc buffer */
2134 size = _IOC_SIZE(ctl->ioctl_code);
2135 if (size > 0) {
2136 buf = kmalloc(size, GFP_KERNEL);
2137 if (buf == NULL)
2138 return -ENOMEM;
2139 if ((_IOC_DIR(ctl->ioctl_code) & _IOC_WRITE)) {
2140 if (copy_from_user(buf, ctl->data, size)) {
2141 kfree(buf);
2142 return -EFAULT;
2143 }
2144 } else {
2145 memset(buf, 0, size);
2146 }
2147 }
2148
2149 if (!connected(ps)) {
2150 kfree(buf);
2151 return -ENODEV;
2152 }
2153
2154 if (ps->dev->state != USB_STATE_CONFIGURED)
2155 retval = -EHOSTUNREACH;
2156 else if (!(intf = usb_ifnum_to_if(ps->dev, ctl->ifno)))
2157 retval = -EINVAL;
2158 else switch (ctl->ioctl_code) {
2159
2160 /* disconnect kernel driver from interface */
2161 case USBDEVFS_DISCONNECT:
2162 if (intf->dev.driver) {
2163 driver = to_usb_driver(intf->dev.driver);
2164 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2165 usb_driver_release_interface(driver, intf);
2166 } else
2167 retval = -ENODATA;
2168 break;
2169
2170 /* let kernel drivers try to (re)bind to the interface */
2171 case USBDEVFS_CONNECT:
2172 if (!intf->dev.driver)
2173 retval = device_attach(&intf->dev);
2174 else
2175 retval = -EBUSY;
2176 break;
2177
2178 /* talk directly to the interface's driver */
2179 default:
2180 if (intf->dev.driver)
2181 driver = to_usb_driver(intf->dev.driver);
2182 if (driver == NULL || driver->unlocked_ioctl == NULL) {
2183 retval = -ENOTTY;
2184 } else {
2185 retval = driver->unlocked_ioctl(intf, ctl->ioctl_code, buf);
2186 if (retval == -ENOIOCTLCMD)
2187 retval = -ENOTTY;
2188 }
2189 }
2190
2191 /* cleanup and return */
2192 if (retval >= 0
2193 && (_IOC_DIR(ctl->ioctl_code) & _IOC_READ) != 0
2194 && size > 0
2195 && copy_to_user(ctl->data, buf, size) != 0)
2196 retval = -EFAULT;
2197
2198 kfree(buf);
2199 return retval;
2200 }
2201
2202 static int proc_ioctl_default(struct usb_dev_state *ps, void __user *arg)
2203 {
2204 struct usbdevfs_ioctl ctrl;
2205
2206 if (copy_from_user(&ctrl, arg, sizeof(ctrl)))
2207 return -EFAULT;
2208 return proc_ioctl(ps, &ctrl);
2209 }
2210
2211 #ifdef CONFIG_COMPAT
2212 static int proc_ioctl_compat(struct usb_dev_state *ps, compat_uptr_t arg)
2213 {
2214 struct usbdevfs_ioctl32 ioc32;
2215 struct usbdevfs_ioctl ctrl;
2216
2217 if (copy_from_user(&ioc32, compat_ptr(arg), sizeof(ioc32)))
2218 return -EFAULT;
2219 ctrl.ifno = ioc32.ifno;
2220 ctrl.ioctl_code = ioc32.ioctl_code;
2221 ctrl.data = compat_ptr(ioc32.data);
2222 return proc_ioctl(ps, &ctrl);
2223 }
2224 #endif
2225
2226 static int proc_claim_port(struct usb_dev_state *ps, void __user *arg)
2227 {
2228 unsigned portnum;
2229 int rc;
2230
2231 if (get_user(portnum, (unsigned __user *) arg))
2232 return -EFAULT;
2233 rc = usb_hub_claim_port(ps->dev, portnum, ps);
2234 if (rc == 0)
2235 snoop(&ps->dev->dev, "port %d claimed by process %d: %s\n",
2236 portnum, task_pid_nr(current), current->comm);
2237 return rc;
2238 }
2239
2240 static int proc_release_port(struct usb_dev_state *ps, void __user *arg)
2241 {
2242 unsigned portnum;
2243
2244 if (get_user(portnum, (unsigned __user *) arg))
2245 return -EFAULT;
2246 return usb_hub_release_port(ps->dev, portnum, ps);
2247 }
2248
2249 static int proc_get_capabilities(struct usb_dev_state *ps, void __user *arg)
2250 {
2251 __u32 caps;
2252
2253 caps = USBDEVFS_CAP_ZERO_PACKET | USBDEVFS_CAP_NO_PACKET_SIZE_LIM |
2254 USBDEVFS_CAP_REAP_AFTER_DISCONNECT | USBDEVFS_CAP_MMAP |
2255 USBDEVFS_CAP_DROP_PRIVILEGES;
2256 if (!ps->dev->bus->no_stop_on_short)
2257 caps |= USBDEVFS_CAP_BULK_CONTINUATION;
2258 if (ps->dev->bus->sg_tablesize)
2259 caps |= USBDEVFS_CAP_BULK_SCATTER_GATHER;
2260
2261 if (put_user(caps, (__u32 __user *)arg))
2262 return -EFAULT;
2263
2264 return 0;
2265 }
2266
2267 static int proc_disconnect_claim(struct usb_dev_state *ps, void __user *arg)
2268 {
2269 struct usbdevfs_disconnect_claim dc;
2270 struct usb_interface *intf;
2271
2272 if (copy_from_user(&dc, arg, sizeof(dc)))
2273 return -EFAULT;
2274
2275 intf = usb_ifnum_to_if(ps->dev, dc.interface);
2276 if (!intf)
2277 return -EINVAL;
2278
2279 if (intf->dev.driver) {
2280 struct usb_driver *driver = to_usb_driver(intf->dev.driver);
2281
2282 if (ps->privileges_dropped)
2283 return -EACCES;
2284
2285 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_IF_DRIVER) &&
2286 strncmp(dc.driver, intf->dev.driver->name,
2287 sizeof(dc.driver)) != 0)
2288 return -EBUSY;
2289
2290 if ((dc.flags & USBDEVFS_DISCONNECT_CLAIM_EXCEPT_DRIVER) &&
2291 strncmp(dc.driver, intf->dev.driver->name,
2292 sizeof(dc.driver)) == 0)
2293 return -EBUSY;
2294
2295 dev_dbg(&intf->dev, "disconnect by usbfs\n");
2296 usb_driver_release_interface(driver, intf);
2297 }
2298
2299 return claimintf(ps, dc.interface);
2300 }
2301
2302 static int proc_alloc_streams(struct usb_dev_state *ps, void __user *arg)
2303 {
2304 unsigned num_streams, num_eps;
2305 struct usb_host_endpoint **eps;
2306 struct usb_interface *intf;
2307 int r;
2308
2309 r = parse_usbdevfs_streams(ps, arg, &num_streams, &num_eps,
2310 &eps, &intf);
2311 if (r)
2312 return r;
2313
2314 destroy_async_on_interface(ps,
2315 intf->altsetting[0].desc.bInterfaceNumber);
2316
2317 r = usb_alloc_streams(intf, eps, num_eps, num_streams, GFP_KERNEL);
2318 kfree(eps);
2319 return r;
2320 }
2321
2322 static int proc_free_streams(struct usb_dev_state *ps, void __user *arg)
2323 {
2324 unsigned num_eps;
2325 struct usb_host_endpoint **eps;
2326 struct usb_interface *intf;
2327 int r;
2328
2329 r = parse_usbdevfs_streams(ps, arg, NULL, &num_eps, &eps, &intf);
2330 if (r)
2331 return r;
2332
2333 destroy_async_on_interface(ps,
2334 intf->altsetting[0].desc.bInterfaceNumber);
2335
2336 r = usb_free_streams(intf, eps, num_eps, GFP_KERNEL);
2337 kfree(eps);
2338 return r;
2339 }
2340
2341 static int proc_drop_privileges(struct usb_dev_state *ps, void __user *arg)
2342 {
2343 u32 data;
2344
2345 if (copy_from_user(&data, arg, sizeof(data)))
2346 return -EFAULT;
2347
2348 /* This is a one way operation. Once privileges are
2349 * dropped, you cannot regain them. You may however reissue
2350 * this ioctl to shrink the allowed interfaces mask.
2351 */
2352 ps->interface_allowed_mask &= data;
2353 ps->privileges_dropped = true;
2354
2355 return 0;
2356 }
2357
2358 /*
2359 * NOTE: All requests here that have interface numbers as parameters
2360 * are assuming that somehow the configuration has been prevented from
2361 * changing. But there's no mechanism to ensure that...
2362 */
2363 static long usbdev_do_ioctl(struct file *file, unsigned int cmd,
2364 void __user *p)
2365 {
2366 struct usb_dev_state *ps = file->private_data;
2367 struct inode *inode = file_inode(file);
2368 struct usb_device *dev = ps->dev;
2369 int ret = -ENOTTY;
2370
2371 if (!(file->f_mode & FMODE_WRITE))
2372 return -EPERM;
2373
2374 usb_lock_device(dev);
2375
2376 /* Reap operations are allowed even after disconnection */
2377 switch (cmd) {
2378 case USBDEVFS_REAPURB:
2379 snoop(&dev->dev, "%s: REAPURB\n", __func__);
2380 ret = proc_reapurb(ps, p);
2381 goto done;
2382
2383 case USBDEVFS_REAPURBNDELAY:
2384 snoop(&dev->dev, "%s: REAPURBNDELAY\n", __func__);
2385 ret = proc_reapurbnonblock(ps, p);
2386 goto done;
2387
2388 #ifdef CONFIG_COMPAT
2389 case USBDEVFS_REAPURB32:
2390 snoop(&dev->dev, "%s: REAPURB32\n", __func__);
2391 ret = proc_reapurb_compat(ps, p);
2392 goto done;
2393
2394 case USBDEVFS_REAPURBNDELAY32:
2395 snoop(&dev->dev, "%s: REAPURBNDELAY32\n", __func__);
2396 ret = proc_reapurbnonblock_compat(ps, p);
2397 goto done;
2398 #endif
2399 }
2400
2401 if (!connected(ps)) {
2402 usb_unlock_device(dev);
2403 return -ENODEV;
2404 }
2405
2406 switch (cmd) {
2407 case USBDEVFS_CONTROL:
2408 snoop(&dev->dev, "%s: CONTROL\n", __func__);
2409 ret = proc_control(ps, p);
2410 if (ret >= 0)
2411 inode->i_mtime = current_time(inode);
2412 break;
2413
2414 case USBDEVFS_BULK:
2415 snoop(&dev->dev, "%s: BULK\n", __func__);
2416 ret = proc_bulk(ps, p);
2417 if (ret >= 0)
2418 inode->i_mtime = current_time(inode);
2419 break;
2420
2421 case USBDEVFS_RESETEP:
2422 snoop(&dev->dev, "%s: RESETEP\n", __func__);
2423 ret = proc_resetep(ps, p);
2424 if (ret >= 0)
2425 inode->i_mtime = current_time(inode);
2426 break;
2427
2428 case USBDEVFS_RESET:
2429 snoop(&dev->dev, "%s: RESET\n", __func__);
2430 ret = proc_resetdevice(ps);
2431 break;
2432
2433 case USBDEVFS_CLEAR_HALT:
2434 snoop(&dev->dev, "%s: CLEAR_HALT\n", __func__);
2435 ret = proc_clearhalt(ps, p);
2436 if (ret >= 0)
2437 inode->i_mtime = current_time(inode);
2438 break;
2439
2440 case USBDEVFS_GETDRIVER:
2441 snoop(&dev->dev, "%s: GETDRIVER\n", __func__);
2442 ret = proc_getdriver(ps, p);
2443 break;
2444
2445 case USBDEVFS_CONNECTINFO:
2446 snoop(&dev->dev, "%s: CONNECTINFO\n", __func__);
2447 ret = proc_connectinfo(ps, p);
2448 break;
2449
2450 case USBDEVFS_SETINTERFACE:
2451 snoop(&dev->dev, "%s: SETINTERFACE\n", __func__);
2452 ret = proc_setintf(ps, p);
2453 break;
2454
2455 case USBDEVFS_SETCONFIGURATION:
2456 snoop(&dev->dev, "%s: SETCONFIGURATION\n", __func__);
2457 ret = proc_setconfig(ps, p);
2458 break;
2459
2460 case USBDEVFS_SUBMITURB:
2461 snoop(&dev->dev, "%s: SUBMITURB\n", __func__);
2462 ret = proc_submiturb(ps, p);
2463 if (ret >= 0)
2464 inode->i_mtime = current_time(inode);
2465 break;
2466
2467 #ifdef CONFIG_COMPAT
2468 case USBDEVFS_CONTROL32:
2469 snoop(&dev->dev, "%s: CONTROL32\n", __func__);
2470 ret = proc_control_compat(ps, p);
2471 if (ret >= 0)
2472 inode->i_mtime = current_time(inode);
2473 break;
2474
2475 case USBDEVFS_BULK32:
2476 snoop(&dev->dev, "%s: BULK32\n", __func__);
2477 ret = proc_bulk_compat(ps, p);
2478 if (ret >= 0)
2479 inode->i_mtime = current_time(inode);
2480 break;
2481
2482 case USBDEVFS_DISCSIGNAL32:
2483 snoop(&dev->dev, "%s: DISCSIGNAL32\n", __func__);
2484 ret = proc_disconnectsignal_compat(ps, p);
2485 break;
2486
2487 case USBDEVFS_SUBMITURB32:
2488 snoop(&dev->dev, "%s: SUBMITURB32\n", __func__);
2489 ret = proc_submiturb_compat(ps, p);
2490 if (ret >= 0)
2491 inode->i_mtime = current_time(inode);
2492 break;
2493
2494 case USBDEVFS_IOCTL32:
2495 snoop(&dev->dev, "%s: IOCTL32\n", __func__);
2496 ret = proc_ioctl_compat(ps, ptr_to_compat(p));
2497 break;
2498 #endif
2499
2500 case USBDEVFS_DISCARDURB:
2501 snoop(&dev->dev, "%s: DISCARDURB %pK\n", __func__, p);
2502 ret = proc_unlinkurb(ps, p);
2503 break;
2504
2505 case USBDEVFS_DISCSIGNAL:
2506 snoop(&dev->dev, "%s: DISCSIGNAL\n", __func__);
2507 ret = proc_disconnectsignal(ps, p);
2508 break;
2509
2510 case USBDEVFS_CLAIMINTERFACE:
2511 snoop(&dev->dev, "%s: CLAIMINTERFACE\n", __func__);
2512 ret = proc_claiminterface(ps, p);
2513 break;
2514
2515 case USBDEVFS_RELEASEINTERFACE:
2516 snoop(&dev->dev, "%s: RELEASEINTERFACE\n", __func__);
2517 ret = proc_releaseinterface(ps, p);
2518 break;
2519
2520 case USBDEVFS_IOCTL:
2521 snoop(&dev->dev, "%s: IOCTL\n", __func__);
2522 ret = proc_ioctl_default(ps, p);
2523 break;
2524
2525 case USBDEVFS_CLAIM_PORT:
2526 snoop(&dev->dev, "%s: CLAIM_PORT\n", __func__);
2527 ret = proc_claim_port(ps, p);
2528 break;
2529
2530 case USBDEVFS_RELEASE_PORT:
2531 snoop(&dev->dev, "%s: RELEASE_PORT\n", __func__);
2532 ret = proc_release_port(ps, p);
2533 break;
2534 case USBDEVFS_GET_CAPABILITIES:
2535 ret = proc_get_capabilities(ps, p);
2536 break;
2537 case USBDEVFS_DISCONNECT_CLAIM:
2538 ret = proc_disconnect_claim(ps, p);
2539 break;
2540 case USBDEVFS_ALLOC_STREAMS:
2541 ret = proc_alloc_streams(ps, p);
2542 break;
2543 case USBDEVFS_FREE_STREAMS:
2544 ret = proc_free_streams(ps, p);
2545 break;
2546 case USBDEVFS_DROP_PRIVILEGES:
2547 ret = proc_drop_privileges(ps, p);
2548 break;
2549 case USBDEVFS_GET_SPEED:
2550 ret = ps->dev->speed;
2551 break;
2552 }
2553
2554 done:
2555 usb_unlock_device(dev);
2556 if (ret >= 0)
2557 inode->i_atime = current_time(inode);
2558 return ret;
2559 }
2560
2561 static long usbdev_ioctl(struct file *file, unsigned int cmd,
2562 unsigned long arg)
2563 {
2564 int ret;
2565
2566 ret = usbdev_do_ioctl(file, cmd, (void __user *)arg);
2567
2568 return ret;
2569 }
2570
2571 #ifdef CONFIG_COMPAT
2572 static long usbdev_compat_ioctl(struct file *file, unsigned int cmd,
2573 unsigned long arg)
2574 {
2575 int ret;
2576
2577 ret = usbdev_do_ioctl(file, cmd, compat_ptr(arg));
2578
2579 return ret;
2580 }
2581 #endif
2582
2583 /* No kernel lock - fine */
2584 static __poll_t usbdev_poll(struct file *file,
2585 struct poll_table_struct *wait)
2586 {
2587 struct usb_dev_state *ps = file->private_data;
2588 __poll_t mask = 0;
2589
2590 poll_wait(file, &ps->wait, wait);
2591 if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
2592 mask |= EPOLLOUT | EPOLLWRNORM;
2593 if (!connected(ps))
2594 mask |= EPOLLHUP;
2595 if (list_empty(&ps->list))
2596 mask |= EPOLLERR;
2597 return mask;
2598 }
2599
2600 const struct file_operations usbdev_file_operations = {
2601 .owner = THIS_MODULE,
2602 .llseek = no_seek_end_llseek,
2603 .read = usbdev_read,
2604 .poll = usbdev_poll,
2605 .unlocked_ioctl = usbdev_ioctl,
2606 #ifdef CONFIG_COMPAT
2607 .compat_ioctl = usbdev_compat_ioctl,
2608 #endif
2609 .mmap = usbdev_mmap,
2610 .open = usbdev_open,
2611 .release = usbdev_release,
2612 };
2613
2614 static void usbdev_remove(struct usb_device *udev)
2615 {
2616 struct usb_dev_state *ps;
2617 struct kernel_siginfo sinfo;
2618
2619 while (!list_empty(&udev->filelist)) {
2620 ps = list_entry(udev->filelist.next, struct usb_dev_state, list);
2621 destroy_all_async(ps);
2622 wake_up_all(&ps->wait);
2623 list_del_init(&ps->list);
2624 if (ps->discsignr) {
2625 clear_siginfo(&sinfo);
2626 sinfo.si_signo = ps->discsignr;
2627 sinfo.si_errno = EPIPE;
2628 sinfo.si_code = SI_ASYNCIO;
2629 sinfo.si_addr = ps->disccontext;
2630 kill_pid_info_as_cred(ps->discsignr, &sinfo,
2631 ps->disc_pid, ps->cred);
2632 }
2633 }
2634 }
2635
2636 static int usbdev_notify(struct notifier_block *self,
2637 unsigned long action, void *dev)
2638 {
2639 switch (action) {
2640 case USB_DEVICE_ADD:
2641 break;
2642 case USB_DEVICE_REMOVE:
2643 usbdev_remove(dev);
2644 break;
2645 }
2646 return NOTIFY_OK;
2647 }
2648
2649 static struct notifier_block usbdev_nb = {
2650 .notifier_call = usbdev_notify,
2651 };
2652
2653 static struct cdev usb_device_cdev;
2654
2655 int __init usb_devio_init(void)
2656 {
2657 int retval;
2658
2659 retval = register_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX,
2660 "usb_device");
2661 if (retval) {
2662 printk(KERN_ERR "Unable to register minors for usb_device\n");
2663 goto out;
2664 }
2665 cdev_init(&usb_device_cdev, &usbdev_file_operations);
2666 retval = cdev_add(&usb_device_cdev, USB_DEVICE_DEV, USB_DEVICE_MAX);
2667 if (retval) {
2668 printk(KERN_ERR "Unable to get usb_device major %d\n",
2669 USB_DEVICE_MAJOR);
2670 goto error_cdev;
2671 }
2672 usb_register_notify(&usbdev_nb);
2673 out:
2674 return retval;
2675
2676 error_cdev:
2677 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2678 goto out;
2679 }
2680
2681 void usb_devio_cleanup(void)
2682 {
2683 usb_unregister_notify(&usbdev_nb);
2684 cdev_del(&usb_device_cdev);
2685 unregister_chrdev_region(USB_DEVICE_DEV, USB_DEVICE_MAX);
2686 }
Linux with added FPC-III support