Commit | Line | Data |
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6f99612e SB |
1 | /* |
2 | * Copyright (C) 2015, 2016 IBM Corporation | |
7ea7861c | 3 | * Copyright (C) 2016 Intel Corporation |
6f99612e SB |
4 | * |
5 | * Author: Stefan Berger <stefanb@us.ibm.com> | |
6 | * | |
7 | * Maintained by: <tpmdd-devel@lists.sourceforge.net> | |
8 | * | |
9 | * Device driver for vTPM (vTPM proxy driver) | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License as | |
13 | * published by the Free Software Foundation, version 2 of the | |
14 | * License. | |
15 | * | |
16 | */ | |
17 | ||
18 | #include <linux/types.h> | |
19 | #include <linux/spinlock.h> | |
20 | #include <linux/uaccess.h> | |
21 | #include <linux/wait.h> | |
22 | #include <linux/miscdevice.h> | |
23 | #include <linux/vtpm_proxy.h> | |
24 | #include <linux/file.h> | |
25 | #include <linux/anon_inodes.h> | |
26 | #include <linux/poll.h> | |
27 | #include <linux/compat.h> | |
28 | ||
29 | #include "tpm.h" | |
30 | ||
31 | #define VTPM_PROXY_REQ_COMPLETE_FLAG BIT(0) | |
32 | ||
33 | struct proxy_dev { | |
34 | struct tpm_chip *chip; | |
35 | ||
36 | u32 flags; /* public API flags */ | |
37 | ||
38 | wait_queue_head_t wq; | |
39 | ||
40 | struct mutex buf_lock; /* protect buffer and flags */ | |
41 | ||
42 | long state; /* internal state */ | |
43 | #define STATE_OPENED_FLAG BIT(0) | |
44 | #define STATE_WAIT_RESPONSE_FLAG BIT(1) /* waiting for emulator response */ | |
c4484f79 | 45 | #define STATE_REGISTERED_FLAG BIT(2) |
6f99612e SB |
46 | |
47 | size_t req_len; /* length of queued TPM request */ | |
48 | size_t resp_len; /* length of queued TPM response */ | |
49 | u8 buffer[TPM_BUFSIZE]; /* request/response buffer */ | |
50 | ||
51 | struct work_struct work; /* task that retrieves TPM timeouts */ | |
52 | }; | |
53 | ||
54 | /* all supported flags */ | |
55 | #define VTPM_PROXY_FLAGS_ALL (VTPM_PROXY_FLAG_TPM2) | |
56 | ||
57 | static struct workqueue_struct *workqueue; | |
58 | ||
59 | static void vtpm_proxy_delete_device(struct proxy_dev *proxy_dev); | |
60 | ||
61 | /* | |
62 | * Functions related to 'server side' | |
63 | */ | |
64 | ||
65 | /** | |
66 | * vtpm_proxy_fops_read - Read TPM commands on 'server side' | |
67 | * | |
93c12f29 WT |
68 | * @filp: file pointer |
69 | * @buf: read buffer | |
70 | * @count: number of bytes to read | |
71 | * @off: offset | |
72 | * | |
73 | * Return: | |
6f99612e SB |
74 | * Number of bytes read or negative error code |
75 | */ | |
76 | static ssize_t vtpm_proxy_fops_read(struct file *filp, char __user *buf, | |
77 | size_t count, loff_t *off) | |
78 | { | |
79 | struct proxy_dev *proxy_dev = filp->private_data; | |
80 | size_t len; | |
81 | int sig, rc; | |
82 | ||
83 | sig = wait_event_interruptible(proxy_dev->wq, | |
84 | proxy_dev->req_len != 0 || | |
85 | !(proxy_dev->state & STATE_OPENED_FLAG)); | |
86 | if (sig) | |
87 | return -EINTR; | |
88 | ||
89 | mutex_lock(&proxy_dev->buf_lock); | |
90 | ||
91 | if (!(proxy_dev->state & STATE_OPENED_FLAG)) { | |
92 | mutex_unlock(&proxy_dev->buf_lock); | |
93 | return -EPIPE; | |
94 | } | |
95 | ||
96 | len = proxy_dev->req_len; | |
97 | ||
98 | if (count < len) { | |
99 | mutex_unlock(&proxy_dev->buf_lock); | |
100 | pr_debug("Invalid size in recv: count=%zd, req_len=%zd\n", | |
101 | count, len); | |
102 | return -EIO; | |
103 | } | |
104 | ||
105 | rc = copy_to_user(buf, proxy_dev->buffer, len); | |
106 | memset(proxy_dev->buffer, 0, len); | |
107 | proxy_dev->req_len = 0; | |
108 | ||
109 | if (!rc) | |
110 | proxy_dev->state |= STATE_WAIT_RESPONSE_FLAG; | |
111 | ||
112 | mutex_unlock(&proxy_dev->buf_lock); | |
113 | ||
114 | if (rc) | |
115 | return -EFAULT; | |
116 | ||
117 | return len; | |
118 | } | |
119 | ||
120 | /** | |
121 | * vtpm_proxy_fops_write - Write TPM responses on 'server side' | |
122 | * | |
93c12f29 WT |
123 | * @filp: file pointer |
124 | * @buf: write buffer | |
125 | * @count: number of bytes to write | |
126 | * @off: offset | |
127 | * | |
128 | * Return: | |
6f99612e SB |
129 | * Number of bytes read or negative error value |
130 | */ | |
131 | static ssize_t vtpm_proxy_fops_write(struct file *filp, const char __user *buf, | |
132 | size_t count, loff_t *off) | |
133 | { | |
134 | struct proxy_dev *proxy_dev = filp->private_data; | |
135 | ||
136 | mutex_lock(&proxy_dev->buf_lock); | |
137 | ||
138 | if (!(proxy_dev->state & STATE_OPENED_FLAG)) { | |
139 | mutex_unlock(&proxy_dev->buf_lock); | |
140 | return -EPIPE; | |
141 | } | |
142 | ||
143 | if (count > sizeof(proxy_dev->buffer) || | |
144 | !(proxy_dev->state & STATE_WAIT_RESPONSE_FLAG)) { | |
145 | mutex_unlock(&proxy_dev->buf_lock); | |
146 | return -EIO; | |
147 | } | |
148 | ||
149 | proxy_dev->state &= ~STATE_WAIT_RESPONSE_FLAG; | |
150 | ||
151 | proxy_dev->req_len = 0; | |
152 | ||
153 | if (copy_from_user(proxy_dev->buffer, buf, count)) { | |
154 | mutex_unlock(&proxy_dev->buf_lock); | |
155 | return -EFAULT; | |
156 | } | |
157 | ||
158 | proxy_dev->resp_len = count; | |
159 | ||
160 | mutex_unlock(&proxy_dev->buf_lock); | |
161 | ||
162 | wake_up_interruptible(&proxy_dev->wq); | |
163 | ||
164 | return count; | |
165 | } | |
166 | ||
167 | /* | |
93c12f29 WT |
168 | * vtpm_proxy_fops_poll - Poll status on 'server side' |
169 | * | |
170 | * @filp: file pointer | |
171 | * @wait: poll table | |
6f99612e | 172 | * |
93c12f29 | 173 | * Return: Poll flags |
6f99612e SB |
174 | */ |
175 | static unsigned int vtpm_proxy_fops_poll(struct file *filp, poll_table *wait) | |
176 | { | |
177 | struct proxy_dev *proxy_dev = filp->private_data; | |
178 | unsigned ret; | |
179 | ||
180 | poll_wait(filp, &proxy_dev->wq, wait); | |
181 | ||
182 | ret = POLLOUT; | |
183 | ||
184 | mutex_lock(&proxy_dev->buf_lock); | |
185 | ||
186 | if (proxy_dev->req_len) | |
187 | ret |= POLLIN | POLLRDNORM; | |
188 | ||
189 | if (!(proxy_dev->state & STATE_OPENED_FLAG)) | |
190 | ret |= POLLHUP; | |
191 | ||
192 | mutex_unlock(&proxy_dev->buf_lock); | |
193 | ||
194 | return ret; | |
195 | } | |
196 | ||
197 | /* | |
198 | * vtpm_proxy_fops_open - Open vTPM device on 'server side' | |
199 | * | |
93c12f29 WT |
200 | * @filp: file pointer |
201 | * | |
6f99612e SB |
202 | * Called when setting up the anonymous file descriptor |
203 | */ | |
204 | static void vtpm_proxy_fops_open(struct file *filp) | |
205 | { | |
206 | struct proxy_dev *proxy_dev = filp->private_data; | |
207 | ||
208 | proxy_dev->state |= STATE_OPENED_FLAG; | |
209 | } | |
210 | ||
211 | /** | |
212 | * vtpm_proxy_fops_undo_open - counter-part to vtpm_fops_open | |
93c12f29 | 213 | * Call to undo vtpm_proxy_fops_open |
6f99612e | 214 | * |
93c12f29 | 215 | *@proxy_dev: tpm proxy device |
6f99612e SB |
216 | */ |
217 | static void vtpm_proxy_fops_undo_open(struct proxy_dev *proxy_dev) | |
218 | { | |
219 | mutex_lock(&proxy_dev->buf_lock); | |
220 | ||
221 | proxy_dev->state &= ~STATE_OPENED_FLAG; | |
222 | ||
223 | mutex_unlock(&proxy_dev->buf_lock); | |
224 | ||
225 | /* no more TPM responses -- wake up anyone waiting for them */ | |
226 | wake_up_interruptible(&proxy_dev->wq); | |
227 | } | |
228 | ||
229 | /* | |
93c12f29 | 230 | * vtpm_proxy_fops_release - Close 'server side' |
6f99612e | 231 | * |
93c12f29 WT |
232 | * @inode: inode |
233 | * @filp: file pointer | |
234 | * Return: | |
6f99612e SB |
235 | * Always returns 0. |
236 | */ | |
237 | static int vtpm_proxy_fops_release(struct inode *inode, struct file *filp) | |
238 | { | |
239 | struct proxy_dev *proxy_dev = filp->private_data; | |
240 | ||
241 | filp->private_data = NULL; | |
242 | ||
243 | vtpm_proxy_delete_device(proxy_dev); | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | static const struct file_operations vtpm_proxy_fops = { | |
249 | .owner = THIS_MODULE, | |
250 | .llseek = no_llseek, | |
251 | .read = vtpm_proxy_fops_read, | |
252 | .write = vtpm_proxy_fops_write, | |
253 | .poll = vtpm_proxy_fops_poll, | |
254 | .release = vtpm_proxy_fops_release, | |
255 | }; | |
256 | ||
257 | /* | |
258 | * Functions invoked by the core TPM driver to send TPM commands to | |
259 | * 'server side' and receive responses from there. | |
260 | */ | |
261 | ||
262 | /* | |
263 | * Called when core TPM driver reads TPM responses from 'server side' | |
264 | * | |
93c12f29 WT |
265 | * @chip: tpm chip to use |
266 | * @buf: receive buffer | |
267 | * @count: bytes to read | |
268 | * Return: | |
6f99612e SB |
269 | * Number of TPM response bytes read, negative error value otherwise |
270 | */ | |
271 | static int vtpm_proxy_tpm_op_recv(struct tpm_chip *chip, u8 *buf, size_t count) | |
272 | { | |
273 | struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev); | |
274 | size_t len; | |
275 | ||
276 | /* process gone ? */ | |
277 | mutex_lock(&proxy_dev->buf_lock); | |
278 | ||
279 | if (!(proxy_dev->state & STATE_OPENED_FLAG)) { | |
280 | mutex_unlock(&proxy_dev->buf_lock); | |
281 | return -EPIPE; | |
282 | } | |
283 | ||
284 | len = proxy_dev->resp_len; | |
285 | if (count < len) { | |
286 | dev_err(&chip->dev, | |
287 | "Invalid size in recv: count=%zd, resp_len=%zd\n", | |
288 | count, len); | |
289 | len = -EIO; | |
290 | goto out; | |
291 | } | |
292 | ||
293 | memcpy(buf, proxy_dev->buffer, len); | |
294 | proxy_dev->resp_len = 0; | |
295 | ||
296 | out: | |
297 | mutex_unlock(&proxy_dev->buf_lock); | |
298 | ||
299 | return len; | |
300 | } | |
301 | ||
302 | /* | |
303 | * Called when core TPM driver forwards TPM requests to 'server side'. | |
304 | * | |
93c12f29 WT |
305 | * @chip: tpm chip to use |
306 | * @buf: send buffer | |
307 | * @count: bytes to send | |
308 | * | |
309 | * Return: | |
6f99612e SB |
310 | * 0 in case of success, negative error value otherwise. |
311 | */ | |
312 | static int vtpm_proxy_tpm_op_send(struct tpm_chip *chip, u8 *buf, size_t count) | |
313 | { | |
314 | struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev); | |
315 | int rc = 0; | |
316 | ||
317 | if (count > sizeof(proxy_dev->buffer)) { | |
318 | dev_err(&chip->dev, | |
319 | "Invalid size in send: count=%zd, buffer size=%zd\n", | |
320 | count, sizeof(proxy_dev->buffer)); | |
321 | return -EIO; | |
322 | } | |
323 | ||
324 | mutex_lock(&proxy_dev->buf_lock); | |
325 | ||
326 | if (!(proxy_dev->state & STATE_OPENED_FLAG)) { | |
327 | mutex_unlock(&proxy_dev->buf_lock); | |
328 | return -EPIPE; | |
329 | } | |
330 | ||
331 | proxy_dev->resp_len = 0; | |
332 | ||
333 | proxy_dev->req_len = count; | |
334 | memcpy(proxy_dev->buffer, buf, count); | |
335 | ||
336 | proxy_dev->state &= ~STATE_WAIT_RESPONSE_FLAG; | |
337 | ||
338 | mutex_unlock(&proxy_dev->buf_lock); | |
339 | ||
340 | wake_up_interruptible(&proxy_dev->wq); | |
341 | ||
342 | return rc; | |
343 | } | |
344 | ||
345 | static void vtpm_proxy_tpm_op_cancel(struct tpm_chip *chip) | |
346 | { | |
347 | /* not supported */ | |
348 | } | |
349 | ||
350 | static u8 vtpm_proxy_tpm_op_status(struct tpm_chip *chip) | |
351 | { | |
352 | struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev); | |
353 | ||
354 | if (proxy_dev->resp_len) | |
355 | return VTPM_PROXY_REQ_COMPLETE_FLAG; | |
356 | ||
357 | return 0; | |
358 | } | |
359 | ||
360 | static bool vtpm_proxy_tpm_req_canceled(struct tpm_chip *chip, u8 status) | |
361 | { | |
362 | struct proxy_dev *proxy_dev = dev_get_drvdata(&chip->dev); | |
363 | bool ret; | |
364 | ||
365 | mutex_lock(&proxy_dev->buf_lock); | |
366 | ||
367 | ret = !(proxy_dev->state & STATE_OPENED_FLAG); | |
368 | ||
369 | mutex_unlock(&proxy_dev->buf_lock); | |
370 | ||
371 | return ret; | |
372 | } | |
373 | ||
374 | static const struct tpm_class_ops vtpm_proxy_tpm_ops = { | |
cae8b441 | 375 | .flags = TPM_OPS_AUTO_STARTUP, |
6f99612e SB |
376 | .recv = vtpm_proxy_tpm_op_recv, |
377 | .send = vtpm_proxy_tpm_op_send, | |
378 | .cancel = vtpm_proxy_tpm_op_cancel, | |
379 | .status = vtpm_proxy_tpm_op_status, | |
380 | .req_complete_mask = VTPM_PROXY_REQ_COMPLETE_FLAG, | |
381 | .req_complete_val = VTPM_PROXY_REQ_COMPLETE_FLAG, | |
382 | .req_canceled = vtpm_proxy_tpm_req_canceled, | |
383 | }; | |
384 | ||
385 | /* | |
386 | * Code related to the startup of the TPM 2 and startup of TPM 1.2 + | |
387 | * retrieval of timeouts and durations. | |
388 | */ | |
389 | ||
390 | static void vtpm_proxy_work(struct work_struct *work) | |
391 | { | |
392 | struct proxy_dev *proxy_dev = container_of(work, struct proxy_dev, | |
393 | work); | |
394 | int rc; | |
395 | ||
6f99612e SB |
396 | rc = tpm_chip_register(proxy_dev->chip); |
397 | if (rc) | |
c4484f79 JG |
398 | vtpm_proxy_fops_undo_open(proxy_dev); |
399 | else | |
400 | proxy_dev->state |= STATE_REGISTERED_FLAG; | |
6f99612e SB |
401 | } |
402 | ||
403 | /* | |
404 | * vtpm_proxy_work_stop: make sure the work has finished | |
405 | * | |
406 | * This function is useful when user space closed the fd | |
407 | * while the driver still determines timeouts. | |
408 | */ | |
409 | static void vtpm_proxy_work_stop(struct proxy_dev *proxy_dev) | |
410 | { | |
411 | vtpm_proxy_fops_undo_open(proxy_dev); | |
412 | flush_work(&proxy_dev->work); | |
413 | } | |
414 | ||
415 | /* | |
416 | * vtpm_proxy_work_start: Schedule the work for TPM 1.2 & 2 initialization | |
417 | */ | |
418 | static inline void vtpm_proxy_work_start(struct proxy_dev *proxy_dev) | |
419 | { | |
420 | queue_work(workqueue, &proxy_dev->work); | |
421 | } | |
422 | ||
423 | /* | |
424 | * Code related to creation and deletion of device pairs | |
425 | */ | |
426 | static struct proxy_dev *vtpm_proxy_create_proxy_dev(void) | |
427 | { | |
428 | struct proxy_dev *proxy_dev; | |
429 | struct tpm_chip *chip; | |
430 | int err; | |
431 | ||
432 | proxy_dev = kzalloc(sizeof(*proxy_dev), GFP_KERNEL); | |
433 | if (proxy_dev == NULL) | |
434 | return ERR_PTR(-ENOMEM); | |
435 | ||
436 | init_waitqueue_head(&proxy_dev->wq); | |
437 | mutex_init(&proxy_dev->buf_lock); | |
438 | INIT_WORK(&proxy_dev->work, vtpm_proxy_work); | |
439 | ||
440 | chip = tpm_chip_alloc(NULL, &vtpm_proxy_tpm_ops); | |
441 | if (IS_ERR(chip)) { | |
442 | err = PTR_ERR(chip); | |
443 | goto err_proxy_dev_free; | |
444 | } | |
445 | dev_set_drvdata(&chip->dev, proxy_dev); | |
446 | ||
447 | proxy_dev->chip = chip; | |
448 | ||
449 | return proxy_dev; | |
450 | ||
451 | err_proxy_dev_free: | |
452 | kfree(proxy_dev); | |
453 | ||
454 | return ERR_PTR(err); | |
455 | } | |
456 | ||
457 | /* | |
458 | * Undo what has been done in vtpm_create_proxy_dev | |
459 | */ | |
460 | static inline void vtpm_proxy_delete_proxy_dev(struct proxy_dev *proxy_dev) | |
461 | { | |
462 | put_device(&proxy_dev->chip->dev); /* frees chip */ | |
463 | kfree(proxy_dev); | |
464 | } | |
465 | ||
466 | /* | |
467 | * Create a /dev/tpm%d and 'server side' file descriptor pair | |
468 | * | |
93c12f29 | 469 | * Return: |
6f99612e SB |
470 | * Returns file pointer on success, an error value otherwise |
471 | */ | |
472 | static struct file *vtpm_proxy_create_device( | |
473 | struct vtpm_proxy_new_dev *vtpm_new_dev) | |
474 | { | |
475 | struct proxy_dev *proxy_dev; | |
476 | int rc, fd; | |
477 | struct file *file; | |
478 | ||
479 | if (vtpm_new_dev->flags & ~VTPM_PROXY_FLAGS_ALL) | |
480 | return ERR_PTR(-EOPNOTSUPP); | |
481 | ||
482 | proxy_dev = vtpm_proxy_create_proxy_dev(); | |
483 | if (IS_ERR(proxy_dev)) | |
484 | return ERR_CAST(proxy_dev); | |
485 | ||
486 | proxy_dev->flags = vtpm_new_dev->flags; | |
487 | ||
488 | /* setup an anonymous file for the server-side */ | |
489 | fd = get_unused_fd_flags(O_RDWR); | |
490 | if (fd < 0) { | |
491 | rc = fd; | |
492 | goto err_delete_proxy_dev; | |
493 | } | |
494 | ||
495 | file = anon_inode_getfile("[vtpms]", &vtpm_proxy_fops, proxy_dev, | |
496 | O_RDWR); | |
497 | if (IS_ERR(file)) { | |
498 | rc = PTR_ERR(file); | |
499 | goto err_put_unused_fd; | |
500 | } | |
501 | ||
502 | /* from now on we can unwind with put_unused_fd() + fput() */ | |
503 | /* simulate an open() on the server side */ | |
504 | vtpm_proxy_fops_open(file); | |
505 | ||
506 | if (proxy_dev->flags & VTPM_PROXY_FLAG_TPM2) | |
507 | proxy_dev->chip->flags |= TPM_CHIP_FLAG_TPM2; | |
508 | ||
509 | vtpm_proxy_work_start(proxy_dev); | |
510 | ||
511 | vtpm_new_dev->fd = fd; | |
512 | vtpm_new_dev->major = MAJOR(proxy_dev->chip->dev.devt); | |
513 | vtpm_new_dev->minor = MINOR(proxy_dev->chip->dev.devt); | |
514 | vtpm_new_dev->tpm_num = proxy_dev->chip->dev_num; | |
515 | ||
516 | return file; | |
517 | ||
518 | err_put_unused_fd: | |
519 | put_unused_fd(fd); | |
520 | ||
521 | err_delete_proxy_dev: | |
522 | vtpm_proxy_delete_proxy_dev(proxy_dev); | |
523 | ||
524 | return ERR_PTR(rc); | |
525 | } | |
526 | ||
527 | /* | |
528 | * Counter part to vtpm_create_device. | |
529 | */ | |
530 | static void vtpm_proxy_delete_device(struct proxy_dev *proxy_dev) | |
531 | { | |
532 | vtpm_proxy_work_stop(proxy_dev); | |
533 | ||
534 | /* | |
535 | * A client may hold the 'ops' lock, so let it know that the server | |
536 | * side shuts down before we try to grab the 'ops' lock when | |
537 | * unregistering the chip. | |
538 | */ | |
539 | vtpm_proxy_fops_undo_open(proxy_dev); | |
540 | ||
c4484f79 JG |
541 | if (proxy_dev->state & STATE_REGISTERED_FLAG) |
542 | tpm_chip_unregister(proxy_dev->chip); | |
6f99612e SB |
543 | |
544 | vtpm_proxy_delete_proxy_dev(proxy_dev); | |
545 | } | |
546 | ||
547 | /* | |
548 | * Code related to the control device /dev/vtpmx | |
549 | */ | |
550 | ||
7ea7861c JS |
551 | /** |
552 | * vtpmx_ioc_new_dev - handler for the %VTPM_PROXY_IOC_NEW_DEV ioctl | |
553 | * @file: /dev/vtpmx | |
554 | * @ioctl: the ioctl number | |
555 | * @arg: pointer to the struct vtpmx_proxy_new_dev | |
556 | * | |
557 | * Creates an anonymous file that is used by the process acting as a TPM to | |
558 | * communicate with the client processes. The function will also add a new TPM | |
559 | * device through which data is proxied to this TPM acting process. The caller | |
560 | * will be provided with a file descriptor to communicate with the clients and | |
561 | * major and minor numbers for the TPM device. | |
562 | */ | |
563 | static long vtpmx_ioc_new_dev(struct file *file, unsigned int ioctl, | |
564 | unsigned long arg) | |
565 | { | |
566 | void __user *argp = (void __user *)arg; | |
567 | struct vtpm_proxy_new_dev __user *vtpm_new_dev_p; | |
568 | struct vtpm_proxy_new_dev vtpm_new_dev; | |
569 | struct file *vtpm_file; | |
570 | ||
571 | if (!capable(CAP_SYS_ADMIN)) | |
572 | return -EPERM; | |
573 | ||
574 | vtpm_new_dev_p = argp; | |
575 | ||
576 | if (copy_from_user(&vtpm_new_dev, vtpm_new_dev_p, | |
577 | sizeof(vtpm_new_dev))) | |
578 | return -EFAULT; | |
579 | ||
580 | vtpm_file = vtpm_proxy_create_device(&vtpm_new_dev); | |
581 | if (IS_ERR(vtpm_file)) | |
582 | return PTR_ERR(vtpm_file); | |
583 | ||
584 | if (copy_to_user(vtpm_new_dev_p, &vtpm_new_dev, | |
585 | sizeof(vtpm_new_dev))) { | |
586 | put_unused_fd(vtpm_new_dev.fd); | |
587 | fput(vtpm_file); | |
588 | return -EFAULT; | |
589 | } | |
590 | ||
591 | fd_install(vtpm_new_dev.fd, vtpm_file); | |
592 | return 0; | |
593 | } | |
594 | ||
6f99612e SB |
595 | /* |
596 | * vtpmx_fops_ioctl: ioctl on /dev/vtpmx | |
597 | * | |
93c12f29 | 598 | * Return: |
6f99612e SB |
599 | * Returns 0 on success, a negative error code otherwise. |
600 | */ | |
601 | static long vtpmx_fops_ioctl(struct file *f, unsigned int ioctl, | |
7ea7861c | 602 | unsigned long arg) |
6f99612e | 603 | { |
6f99612e SB |
604 | switch (ioctl) { |
605 | case VTPM_PROXY_IOC_NEW_DEV: | |
7ea7861c | 606 | return vtpmx_ioc_new_dev(f, ioctl, arg); |
6f99612e SB |
607 | default: |
608 | return -ENOIOCTLCMD; | |
609 | } | |
610 | } | |
611 | ||
612 | #ifdef CONFIG_COMPAT | |
613 | static long vtpmx_fops_compat_ioctl(struct file *f, unsigned int ioctl, | |
614 | unsigned long arg) | |
615 | { | |
616 | return vtpmx_fops_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); | |
617 | } | |
618 | #endif | |
619 | ||
620 | static const struct file_operations vtpmx_fops = { | |
621 | .owner = THIS_MODULE, | |
622 | .unlocked_ioctl = vtpmx_fops_ioctl, | |
623 | #ifdef CONFIG_COMPAT | |
624 | .compat_ioctl = vtpmx_fops_compat_ioctl, | |
625 | #endif | |
626 | .llseek = noop_llseek, | |
627 | }; | |
628 | ||
629 | static struct miscdevice vtpmx_miscdev = { | |
630 | .minor = MISC_DYNAMIC_MINOR, | |
631 | .name = "vtpmx", | |
632 | .fops = &vtpmx_fops, | |
633 | }; | |
634 | ||
635 | static int vtpmx_init(void) | |
636 | { | |
637 | return misc_register(&vtpmx_miscdev); | |
638 | } | |
639 | ||
640 | static void vtpmx_cleanup(void) | |
641 | { | |
642 | misc_deregister(&vtpmx_miscdev); | |
643 | } | |
644 | ||
645 | static int __init vtpm_module_init(void) | |
646 | { | |
647 | int rc; | |
648 | ||
649 | rc = vtpmx_init(); | |
650 | if (rc) { | |
651 | pr_err("couldn't create vtpmx device\n"); | |
652 | return rc; | |
653 | } | |
654 | ||
655 | workqueue = create_workqueue("tpm-vtpm"); | |
656 | if (!workqueue) { | |
657 | pr_err("couldn't create workqueue\n"); | |
658 | rc = -ENOMEM; | |
659 | goto err_vtpmx_cleanup; | |
660 | } | |
661 | ||
662 | return 0; | |
663 | ||
664 | err_vtpmx_cleanup: | |
665 | vtpmx_cleanup(); | |
666 | ||
667 | return rc; | |
668 | } | |
669 | ||
670 | static void __exit vtpm_module_exit(void) | |
671 | { | |
672 | destroy_workqueue(workqueue); | |
673 | vtpmx_cleanup(); | |
674 | } | |
675 | ||
676 | module_init(vtpm_module_init); | |
677 | module_exit(vtpm_module_exit); | |
678 | ||
679 | MODULE_AUTHOR("Stefan Berger (stefanb@us.ibm.com)"); | |
680 | MODULE_DESCRIPTION("vTPM Driver"); | |
681 | MODULE_VERSION("0.1"); | |
682 | MODULE_LICENSE("GPL"); |