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1da177e4 LT |
1 | /* |
2 | * ipmi_devintf.c | |
3 | * | |
4 | * Linux device interface for the IPMI message handler. | |
5 | * | |
6 | * Author: MontaVista Software, Inc. | |
7 | * Corey Minyard <minyard@mvista.com> | |
8 | * source@mvista.com | |
9 | * | |
10 | * Copyright 2002 MontaVista Software Inc. | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify it | |
13 | * under the terms of the GNU General Public License as published by the | |
14 | * Free Software Foundation; either version 2 of the License, or (at your | |
15 | * option) any later version. | |
16 | * | |
17 | * | |
18 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
19 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
20 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | |
23 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS | |
24 | * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | |
25 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR | |
26 | * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE | |
27 | * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
28 | * | |
29 | * You should have received a copy of the GNU General Public License along | |
30 | * with this program; if not, write to the Free Software Foundation, Inc., | |
31 | * 675 Mass Ave, Cambridge, MA 02139, USA. | |
32 | */ | |
33 | ||
1da177e4 LT |
34 | #include <linux/module.h> |
35 | #include <linux/moduleparam.h> | |
36 | #include <linux/errno.h> | |
37 | #include <asm/system.h> | |
38 | #include <linux/sched.h> | |
39 | #include <linux/poll.h> | |
40 | #include <linux/spinlock.h> | |
41 | #include <linux/slab.h> | |
1da177e4 | 42 | #include <linux/ipmi.h> |
d6dfd131 | 43 | #include <linux/mutex.h> |
1da177e4 | 44 | #include <linux/init.h> |
37e0915b | 45 | #include <linux/device.h> |
6a94f920 | 46 | #include <linux/compat.h> |
1da177e4 | 47 | |
1da177e4 LT |
48 | struct ipmi_file_private |
49 | { | |
50 | ipmi_user_t user; | |
51 | spinlock_t recv_msg_lock; | |
52 | struct list_head recv_msgs; | |
53 | struct file *file; | |
54 | struct fasync_struct *fasync_queue; | |
55 | wait_queue_head_t wait; | |
d6dfd131 | 56 | struct mutex recv_mutex; |
1da177e4 LT |
57 | int default_retries; |
58 | unsigned int default_retry_time_ms; | |
59 | }; | |
60 | ||
61 | static void file_receive_handler(struct ipmi_recv_msg *msg, | |
62 | void *handler_data) | |
63 | { | |
64 | struct ipmi_file_private *priv = handler_data; | |
65 | int was_empty; | |
66 | unsigned long flags; | |
67 | ||
68 | spin_lock_irqsave(&(priv->recv_msg_lock), flags); | |
69 | ||
70 | was_empty = list_empty(&(priv->recv_msgs)); | |
71 | list_add_tail(&(msg->link), &(priv->recv_msgs)); | |
72 | ||
73 | if (was_empty) { | |
74 | wake_up_interruptible(&priv->wait); | |
75 | kill_fasync(&priv->fasync_queue, SIGIO, POLL_IN); | |
76 | } | |
77 | ||
78 | spin_unlock_irqrestore(&(priv->recv_msg_lock), flags); | |
79 | } | |
80 | ||
81 | static unsigned int ipmi_poll(struct file *file, poll_table *wait) | |
82 | { | |
83 | struct ipmi_file_private *priv = file->private_data; | |
84 | unsigned int mask = 0; | |
85 | unsigned long flags; | |
86 | ||
87 | poll_wait(file, &priv->wait, wait); | |
88 | ||
89 | spin_lock_irqsave(&priv->recv_msg_lock, flags); | |
90 | ||
50c812b2 | 91 | if (!list_empty(&(priv->recv_msgs))) |
1da177e4 LT |
92 | mask |= (POLLIN | POLLRDNORM); |
93 | ||
94 | spin_unlock_irqrestore(&priv->recv_msg_lock, flags); | |
95 | ||
96 | return mask; | |
97 | } | |
98 | ||
99 | static int ipmi_fasync(int fd, struct file *file, int on) | |
100 | { | |
101 | struct ipmi_file_private *priv = file->private_data; | |
102 | int result; | |
103 | ||
104 | result = fasync_helper(fd, file, on, &priv->fasync_queue); | |
105 | ||
106 | return (result); | |
107 | } | |
108 | ||
109 | static struct ipmi_user_hndl ipmi_hndlrs = | |
110 | { | |
111 | .ipmi_recv_hndl = file_receive_handler, | |
112 | }; | |
113 | ||
114 | static int ipmi_open(struct inode *inode, struct file *file) | |
115 | { | |
116 | int if_num = iminor(inode); | |
117 | int rv; | |
118 | struct ipmi_file_private *priv; | |
119 | ||
120 | ||
121 | priv = kmalloc(sizeof(*priv), GFP_KERNEL); | |
122 | if (!priv) | |
123 | return -ENOMEM; | |
124 | ||
125 | priv->file = file; | |
126 | ||
127 | rv = ipmi_create_user(if_num, | |
128 | &ipmi_hndlrs, | |
129 | priv, | |
130 | &(priv->user)); | |
131 | if (rv) { | |
132 | kfree(priv); | |
133 | return rv; | |
134 | } | |
135 | ||
136 | file->private_data = priv; | |
137 | ||
138 | spin_lock_init(&(priv->recv_msg_lock)); | |
139 | INIT_LIST_HEAD(&(priv->recv_msgs)); | |
140 | init_waitqueue_head(&priv->wait); | |
141 | priv->fasync_queue = NULL; | |
d6dfd131 | 142 | mutex_init(&priv->recv_mutex); |
1da177e4 LT |
143 | |
144 | /* Use the low-level defaults. */ | |
145 | priv->default_retries = -1; | |
146 | priv->default_retry_time_ms = 0; | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
151 | static int ipmi_release(struct inode *inode, struct file *file) | |
152 | { | |
153 | struct ipmi_file_private *priv = file->private_data; | |
154 | int rv; | |
155 | ||
156 | rv = ipmi_destroy_user(priv->user); | |
157 | if (rv) | |
158 | return rv; | |
159 | ||
160 | ipmi_fasync (-1, file, 0); | |
161 | ||
162 | /* FIXME - free the messages in the list. */ | |
163 | kfree(priv); | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
168 | static int handle_send_req(ipmi_user_t user, | |
169 | struct ipmi_req *req, | |
170 | int retries, | |
171 | unsigned int retry_time_ms) | |
172 | { | |
173 | int rv; | |
174 | struct ipmi_addr addr; | |
175 | struct kernel_ipmi_msg msg; | |
176 | ||
177 | if (req->addr_len > sizeof(struct ipmi_addr)) | |
178 | return -EINVAL; | |
179 | ||
180 | if (copy_from_user(&addr, req->addr, req->addr_len)) | |
181 | return -EFAULT; | |
182 | ||
183 | msg.netfn = req->msg.netfn; | |
184 | msg.cmd = req->msg.cmd; | |
185 | msg.data_len = req->msg.data_len; | |
186 | msg.data = kmalloc(IPMI_MAX_MSG_LENGTH, GFP_KERNEL); | |
187 | if (!msg.data) | |
188 | return -ENOMEM; | |
189 | ||
190 | /* From here out we cannot return, we must jump to "out" for | |
191 | error exits to free msgdata. */ | |
192 | ||
193 | rv = ipmi_validate_addr(&addr, req->addr_len); | |
194 | if (rv) | |
195 | goto out; | |
196 | ||
197 | if (req->msg.data != NULL) { | |
198 | if (req->msg.data_len > IPMI_MAX_MSG_LENGTH) { | |
199 | rv = -EMSGSIZE; | |
200 | goto out; | |
201 | } | |
202 | ||
203 | if (copy_from_user(msg.data, | |
204 | req->msg.data, | |
205 | req->msg.data_len)) | |
206 | { | |
207 | rv = -EFAULT; | |
208 | goto out; | |
209 | } | |
210 | } else { | |
211 | msg.data_len = 0; | |
212 | } | |
213 | ||
214 | rv = ipmi_request_settime(user, | |
215 | &addr, | |
216 | req->msgid, | |
217 | &msg, | |
218 | NULL, | |
219 | 0, | |
220 | retries, | |
221 | retry_time_ms); | |
222 | out: | |
223 | kfree(msg.data); | |
224 | return rv; | |
225 | } | |
226 | ||
227 | static int ipmi_ioctl(struct inode *inode, | |
228 | struct file *file, | |
229 | unsigned int cmd, | |
230 | unsigned long data) | |
231 | { | |
232 | int rv = -EINVAL; | |
233 | struct ipmi_file_private *priv = file->private_data; | |
234 | void __user *arg = (void __user *)data; | |
235 | ||
236 | switch (cmd) | |
237 | { | |
238 | case IPMICTL_SEND_COMMAND: | |
239 | { | |
240 | struct ipmi_req req; | |
241 | ||
242 | if (copy_from_user(&req, arg, sizeof(req))) { | |
243 | rv = -EFAULT; | |
244 | break; | |
245 | } | |
246 | ||
247 | rv = handle_send_req(priv->user, | |
248 | &req, | |
249 | priv->default_retries, | |
250 | priv->default_retry_time_ms); | |
251 | break; | |
252 | } | |
253 | ||
254 | case IPMICTL_SEND_COMMAND_SETTIME: | |
255 | { | |
256 | struct ipmi_req_settime req; | |
257 | ||
258 | if (copy_from_user(&req, arg, sizeof(req))) { | |
259 | rv = -EFAULT; | |
260 | break; | |
261 | } | |
262 | ||
263 | rv = handle_send_req(priv->user, | |
264 | &req.req, | |
265 | req.retries, | |
266 | req.retry_time_ms); | |
267 | break; | |
268 | } | |
269 | ||
270 | case IPMICTL_RECEIVE_MSG: | |
271 | case IPMICTL_RECEIVE_MSG_TRUNC: | |
272 | { | |
273 | struct ipmi_recv rsp; | |
274 | int addr_len; | |
275 | struct list_head *entry; | |
276 | struct ipmi_recv_msg *msg; | |
277 | unsigned long flags; | |
278 | ||
279 | ||
280 | rv = 0; | |
281 | if (copy_from_user(&rsp, arg, sizeof(rsp))) { | |
282 | rv = -EFAULT; | |
283 | break; | |
284 | } | |
285 | ||
d6dfd131 | 286 | /* We claim a mutex because we don't want two |
1da177e4 LT |
287 | users getting something from the queue at a time. |
288 | Since we have to release the spinlock before we can | |
289 | copy the data to the user, it's possible another | |
290 | user will grab something from the queue, too. Then | |
291 | the messages might get out of order if something | |
292 | fails and the message gets put back onto the | |
d6dfd131 CM |
293 | queue. This mutex prevents that problem. */ |
294 | mutex_lock(&priv->recv_mutex); | |
1da177e4 LT |
295 | |
296 | /* Grab the message off the list. */ | |
297 | spin_lock_irqsave(&(priv->recv_msg_lock), flags); | |
298 | if (list_empty(&(priv->recv_msgs))) { | |
299 | spin_unlock_irqrestore(&(priv->recv_msg_lock), flags); | |
300 | rv = -EAGAIN; | |
301 | goto recv_err; | |
302 | } | |
303 | entry = priv->recv_msgs.next; | |
304 | msg = list_entry(entry, struct ipmi_recv_msg, link); | |
305 | list_del(entry); | |
306 | spin_unlock_irqrestore(&(priv->recv_msg_lock), flags); | |
307 | ||
308 | addr_len = ipmi_addr_length(msg->addr.addr_type); | |
309 | if (rsp.addr_len < addr_len) | |
310 | { | |
311 | rv = -EINVAL; | |
312 | goto recv_putback_on_err; | |
313 | } | |
314 | ||
315 | if (copy_to_user(rsp.addr, &(msg->addr), addr_len)) { | |
316 | rv = -EFAULT; | |
317 | goto recv_putback_on_err; | |
318 | } | |
319 | rsp.addr_len = addr_len; | |
320 | ||
321 | rsp.recv_type = msg->recv_type; | |
322 | rsp.msgid = msg->msgid; | |
323 | rsp.msg.netfn = msg->msg.netfn; | |
324 | rsp.msg.cmd = msg->msg.cmd; | |
325 | ||
326 | if (msg->msg.data_len > 0) { | |
327 | if (rsp.msg.data_len < msg->msg.data_len) { | |
328 | rv = -EMSGSIZE; | |
329 | if (cmd == IPMICTL_RECEIVE_MSG_TRUNC) { | |
330 | msg->msg.data_len = rsp.msg.data_len; | |
331 | } else { | |
332 | goto recv_putback_on_err; | |
333 | } | |
334 | } | |
335 | ||
336 | if (copy_to_user(rsp.msg.data, | |
337 | msg->msg.data, | |
338 | msg->msg.data_len)) | |
339 | { | |
340 | rv = -EFAULT; | |
341 | goto recv_putback_on_err; | |
342 | } | |
343 | rsp.msg.data_len = msg->msg.data_len; | |
344 | } else { | |
345 | rsp.msg.data_len = 0; | |
346 | } | |
347 | ||
348 | if (copy_to_user(arg, &rsp, sizeof(rsp))) { | |
349 | rv = -EFAULT; | |
350 | goto recv_putback_on_err; | |
351 | } | |
352 | ||
d6dfd131 | 353 | mutex_unlock(&priv->recv_mutex); |
1da177e4 LT |
354 | ipmi_free_recv_msg(msg); |
355 | break; | |
356 | ||
357 | recv_putback_on_err: | |
358 | /* If we got an error, put the message back onto | |
359 | the head of the queue. */ | |
360 | spin_lock_irqsave(&(priv->recv_msg_lock), flags); | |
361 | list_add(entry, &(priv->recv_msgs)); | |
362 | spin_unlock_irqrestore(&(priv->recv_msg_lock), flags); | |
d6dfd131 | 363 | mutex_unlock(&priv->recv_mutex); |
1da177e4 LT |
364 | break; |
365 | ||
366 | recv_err: | |
d6dfd131 | 367 | mutex_unlock(&priv->recv_mutex); |
1da177e4 LT |
368 | break; |
369 | } | |
370 | ||
371 | case IPMICTL_REGISTER_FOR_CMD: | |
372 | { | |
373 | struct ipmi_cmdspec val; | |
374 | ||
375 | if (copy_from_user(&val, arg, sizeof(val))) { | |
376 | rv = -EFAULT; | |
377 | break; | |
378 | } | |
379 | ||
c69c3127 CM |
380 | rv = ipmi_register_for_cmd(priv->user, val.netfn, val.cmd, |
381 | IPMI_CHAN_ALL); | |
1da177e4 LT |
382 | break; |
383 | } | |
384 | ||
385 | case IPMICTL_UNREGISTER_FOR_CMD: | |
386 | { | |
387 | struct ipmi_cmdspec val; | |
388 | ||
389 | if (copy_from_user(&val, arg, sizeof(val))) { | |
390 | rv = -EFAULT; | |
391 | break; | |
392 | } | |
393 | ||
c69c3127 CM |
394 | rv = ipmi_unregister_for_cmd(priv->user, val.netfn, val.cmd, |
395 | IPMI_CHAN_ALL); | |
396 | break; | |
397 | } | |
398 | ||
399 | case IPMICTL_REGISTER_FOR_CMD_CHANS: | |
400 | { | |
401 | struct ipmi_cmdspec_chans val; | |
402 | ||
403 | if (copy_from_user(&val, arg, sizeof(val))) { | |
404 | rv = -EFAULT; | |
405 | break; | |
406 | } | |
407 | ||
408 | rv = ipmi_register_for_cmd(priv->user, val.netfn, val.cmd, | |
409 | val.chans); | |
410 | break; | |
411 | } | |
412 | ||
413 | case IPMICTL_UNREGISTER_FOR_CMD_CHANS: | |
414 | { | |
415 | struct ipmi_cmdspec_chans val; | |
416 | ||
417 | if (copy_from_user(&val, arg, sizeof(val))) { | |
418 | rv = -EFAULT; | |
419 | break; | |
420 | } | |
421 | ||
422 | rv = ipmi_unregister_for_cmd(priv->user, val.netfn, val.cmd, | |
423 | val.chans); | |
1da177e4 LT |
424 | break; |
425 | } | |
426 | ||
427 | case IPMICTL_SET_GETS_EVENTS_CMD: | |
428 | { | |
429 | int val; | |
430 | ||
431 | if (copy_from_user(&val, arg, sizeof(val))) { | |
432 | rv = -EFAULT; | |
433 | break; | |
434 | } | |
435 | ||
436 | rv = ipmi_set_gets_events(priv->user, val); | |
437 | break; | |
438 | } | |
439 | ||
c14979b9 | 440 | /* The next four are legacy, not per-channel. */ |
1da177e4 LT |
441 | case IPMICTL_SET_MY_ADDRESS_CMD: |
442 | { | |
443 | unsigned int val; | |
444 | ||
445 | if (copy_from_user(&val, arg, sizeof(val))) { | |
446 | rv = -EFAULT; | |
447 | break; | |
448 | } | |
449 | ||
c14979b9 | 450 | rv = ipmi_set_my_address(priv->user, 0, val); |
1da177e4 LT |
451 | break; |
452 | } | |
453 | ||
454 | case IPMICTL_GET_MY_ADDRESS_CMD: | |
455 | { | |
c14979b9 CM |
456 | unsigned int val; |
457 | unsigned char rval; | |
458 | ||
459 | rv = ipmi_get_my_address(priv->user, 0, &rval); | |
460 | if (rv) | |
461 | break; | |
1da177e4 | 462 | |
c14979b9 | 463 | val = rval; |
1da177e4 LT |
464 | |
465 | if (copy_to_user(arg, &val, sizeof(val))) { | |
466 | rv = -EFAULT; | |
467 | break; | |
468 | } | |
1da177e4 LT |
469 | break; |
470 | } | |
471 | ||
472 | case IPMICTL_SET_MY_LUN_CMD: | |
473 | { | |
474 | unsigned int val; | |
475 | ||
476 | if (copy_from_user(&val, arg, sizeof(val))) { | |
477 | rv = -EFAULT; | |
478 | break; | |
479 | } | |
480 | ||
c14979b9 | 481 | rv = ipmi_set_my_LUN(priv->user, 0, val); |
1da177e4 LT |
482 | break; |
483 | } | |
484 | ||
485 | case IPMICTL_GET_MY_LUN_CMD: | |
486 | { | |
c14979b9 CM |
487 | unsigned int val; |
488 | unsigned char rval; | |
489 | ||
490 | rv = ipmi_get_my_LUN(priv->user, 0, &rval); | |
491 | if (rv) | |
492 | break; | |
1da177e4 | 493 | |
c14979b9 | 494 | val = rval; |
1da177e4 LT |
495 | |
496 | if (copy_to_user(arg, &val, sizeof(val))) { | |
497 | rv = -EFAULT; | |
498 | break; | |
499 | } | |
1da177e4 LT |
500 | break; |
501 | } | |
c14979b9 CM |
502 | |
503 | case IPMICTL_SET_MY_CHANNEL_ADDRESS_CMD: | |
504 | { | |
505 | struct ipmi_channel_lun_address_set val; | |
506 | ||
507 | if (copy_from_user(&val, arg, sizeof(val))) { | |
508 | rv = -EFAULT; | |
509 | break; | |
510 | } | |
511 | ||
512 | return ipmi_set_my_address(priv->user, val.channel, val.value); | |
513 | break; | |
514 | } | |
515 | ||
516 | case IPMICTL_GET_MY_CHANNEL_ADDRESS_CMD: | |
517 | { | |
518 | struct ipmi_channel_lun_address_set val; | |
519 | ||
520 | if (copy_from_user(&val, arg, sizeof(val))) { | |
521 | rv = -EFAULT; | |
522 | break; | |
523 | } | |
524 | ||
525 | rv = ipmi_get_my_address(priv->user, val.channel, &val.value); | |
526 | if (rv) | |
527 | break; | |
528 | ||
529 | if (copy_to_user(arg, &val, sizeof(val))) { | |
530 | rv = -EFAULT; | |
531 | break; | |
532 | } | |
533 | break; | |
534 | } | |
535 | ||
536 | case IPMICTL_SET_MY_CHANNEL_LUN_CMD: | |
537 | { | |
538 | struct ipmi_channel_lun_address_set val; | |
539 | ||
540 | if (copy_from_user(&val, arg, sizeof(val))) { | |
541 | rv = -EFAULT; | |
542 | break; | |
543 | } | |
544 | ||
545 | rv = ipmi_set_my_LUN(priv->user, val.channel, val.value); | |
546 | break; | |
547 | } | |
548 | ||
549 | case IPMICTL_GET_MY_CHANNEL_LUN_CMD: | |
550 | { | |
551 | struct ipmi_channel_lun_address_set val; | |
552 | ||
553 | if (copy_from_user(&val, arg, sizeof(val))) { | |
554 | rv = -EFAULT; | |
555 | break; | |
556 | } | |
557 | ||
558 | rv = ipmi_get_my_LUN(priv->user, val.channel, &val.value); | |
559 | if (rv) | |
560 | break; | |
561 | ||
562 | if (copy_to_user(arg, &val, sizeof(val))) { | |
563 | rv = -EFAULT; | |
564 | break; | |
565 | } | |
566 | break; | |
567 | } | |
568 | ||
1da177e4 LT |
569 | case IPMICTL_SET_TIMING_PARMS_CMD: |
570 | { | |
571 | struct ipmi_timing_parms parms; | |
572 | ||
573 | if (copy_from_user(&parms, arg, sizeof(parms))) { | |
574 | rv = -EFAULT; | |
575 | break; | |
576 | } | |
577 | ||
578 | priv->default_retries = parms.retries; | |
579 | priv->default_retry_time_ms = parms.retry_time_ms; | |
580 | rv = 0; | |
581 | break; | |
582 | } | |
583 | ||
584 | case IPMICTL_GET_TIMING_PARMS_CMD: | |
585 | { | |
586 | struct ipmi_timing_parms parms; | |
587 | ||
588 | parms.retries = priv->default_retries; | |
589 | parms.retry_time_ms = priv->default_retry_time_ms; | |
590 | ||
591 | if (copy_to_user(arg, &parms, sizeof(parms))) { | |
592 | rv = -EFAULT; | |
593 | break; | |
594 | } | |
595 | ||
596 | rv = 0; | |
597 | break; | |
598 | } | |
599 | } | |
600 | ||
601 | return rv; | |
602 | } | |
603 | ||
6a94f920 AM |
604 | #ifdef CONFIG_COMPAT |
605 | ||
606 | /* | |
607 | * The following code contains code for supporting 32-bit compatible | |
608 | * ioctls on 64-bit kernels. This allows running 32-bit apps on the | |
609 | * 64-bit kernel | |
610 | */ | |
611 | #define COMPAT_IPMICTL_SEND_COMMAND \ | |
612 | _IOR(IPMI_IOC_MAGIC, 13, struct compat_ipmi_req) | |
613 | #define COMPAT_IPMICTL_SEND_COMMAND_SETTIME \ | |
614 | _IOR(IPMI_IOC_MAGIC, 21, struct compat_ipmi_req_settime) | |
615 | #define COMPAT_IPMICTL_RECEIVE_MSG \ | |
616 | _IOWR(IPMI_IOC_MAGIC, 12, struct compat_ipmi_recv) | |
617 | #define COMPAT_IPMICTL_RECEIVE_MSG_TRUNC \ | |
618 | _IOWR(IPMI_IOC_MAGIC, 11, struct compat_ipmi_recv) | |
619 | ||
620 | struct compat_ipmi_msg { | |
621 | u8 netfn; | |
622 | u8 cmd; | |
623 | u16 data_len; | |
624 | compat_uptr_t data; | |
625 | }; | |
626 | ||
627 | struct compat_ipmi_req { | |
628 | compat_uptr_t addr; | |
629 | compat_uint_t addr_len; | |
630 | compat_long_t msgid; | |
631 | struct compat_ipmi_msg msg; | |
632 | }; | |
633 | ||
634 | struct compat_ipmi_recv { | |
635 | compat_int_t recv_type; | |
636 | compat_uptr_t addr; | |
637 | compat_uint_t addr_len; | |
638 | compat_long_t msgid; | |
639 | struct compat_ipmi_msg msg; | |
640 | }; | |
641 | ||
642 | struct compat_ipmi_req_settime { | |
643 | struct compat_ipmi_req req; | |
644 | compat_int_t retries; | |
645 | compat_uint_t retry_time_ms; | |
646 | }; | |
647 | ||
648 | /* | |
649 | * Define some helper functions for copying IPMI data | |
650 | */ | |
651 | static long get_compat_ipmi_msg(struct ipmi_msg *p64, | |
652 | struct compat_ipmi_msg __user *p32) | |
653 | { | |
654 | compat_uptr_t tmp; | |
655 | ||
656 | if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) || | |
657 | __get_user(p64->netfn, &p32->netfn) || | |
658 | __get_user(p64->cmd, &p32->cmd) || | |
659 | __get_user(p64->data_len, &p32->data_len) || | |
660 | __get_user(tmp, &p32->data)) | |
661 | return -EFAULT; | |
662 | p64->data = compat_ptr(tmp); | |
663 | return 0; | |
664 | } | |
665 | ||
666 | static long put_compat_ipmi_msg(struct ipmi_msg *p64, | |
667 | struct compat_ipmi_msg __user *p32) | |
668 | { | |
669 | if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) || | |
670 | __put_user(p64->netfn, &p32->netfn) || | |
671 | __put_user(p64->cmd, &p32->cmd) || | |
672 | __put_user(p64->data_len, &p32->data_len)) | |
673 | return -EFAULT; | |
674 | return 0; | |
675 | } | |
676 | ||
677 | static long get_compat_ipmi_req(struct ipmi_req *p64, | |
678 | struct compat_ipmi_req __user *p32) | |
679 | { | |
680 | ||
681 | compat_uptr_t tmp; | |
682 | ||
683 | if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) || | |
684 | __get_user(tmp, &p32->addr) || | |
685 | __get_user(p64->addr_len, &p32->addr_len) || | |
686 | __get_user(p64->msgid, &p32->msgid) || | |
687 | get_compat_ipmi_msg(&p64->msg, &p32->msg)) | |
688 | return -EFAULT; | |
689 | p64->addr = compat_ptr(tmp); | |
690 | return 0; | |
691 | } | |
692 | ||
693 | static long get_compat_ipmi_req_settime(struct ipmi_req_settime *p64, | |
694 | struct compat_ipmi_req_settime __user *p32) | |
695 | { | |
696 | if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) || | |
697 | get_compat_ipmi_req(&p64->req, &p32->req) || | |
698 | __get_user(p64->retries, &p32->retries) || | |
699 | __get_user(p64->retry_time_ms, &p32->retry_time_ms)) | |
700 | return -EFAULT; | |
701 | return 0; | |
702 | } | |
703 | ||
704 | static long get_compat_ipmi_recv(struct ipmi_recv *p64, | |
705 | struct compat_ipmi_recv __user *p32) | |
706 | { | |
707 | compat_uptr_t tmp; | |
708 | ||
709 | if (!access_ok(VERIFY_READ, p32, sizeof(*p32)) || | |
710 | __get_user(p64->recv_type, &p32->recv_type) || | |
711 | __get_user(tmp, &p32->addr) || | |
712 | __get_user(p64->addr_len, &p32->addr_len) || | |
713 | __get_user(p64->msgid, &p32->msgid) || | |
714 | get_compat_ipmi_msg(&p64->msg, &p32->msg)) | |
715 | return -EFAULT; | |
716 | p64->addr = compat_ptr(tmp); | |
717 | return 0; | |
718 | } | |
719 | ||
720 | static long put_compat_ipmi_recv(struct ipmi_recv *p64, | |
721 | struct compat_ipmi_recv __user *p32) | |
722 | { | |
723 | if (!access_ok(VERIFY_WRITE, p32, sizeof(*p32)) || | |
724 | __put_user(p64->recv_type, &p32->recv_type) || | |
725 | __put_user(p64->addr_len, &p32->addr_len) || | |
726 | __put_user(p64->msgid, &p32->msgid) || | |
727 | put_compat_ipmi_msg(&p64->msg, &p32->msg)) | |
728 | return -EFAULT; | |
729 | return 0; | |
730 | } | |
731 | ||
732 | /* | |
733 | * Handle compatibility ioctls | |
734 | */ | |
735 | static long compat_ipmi_ioctl(struct file *filep, unsigned int cmd, | |
736 | unsigned long arg) | |
737 | { | |
738 | int rc; | |
739 | struct ipmi_file_private *priv = filep->private_data; | |
740 | ||
741 | switch(cmd) { | |
742 | case COMPAT_IPMICTL_SEND_COMMAND: | |
743 | { | |
744 | struct ipmi_req rp; | |
745 | ||
746 | if (get_compat_ipmi_req(&rp, compat_ptr(arg))) | |
747 | return -EFAULT; | |
748 | ||
749 | return handle_send_req(priv->user, &rp, | |
750 | priv->default_retries, | |
751 | priv->default_retry_time_ms); | |
752 | } | |
753 | case COMPAT_IPMICTL_SEND_COMMAND_SETTIME: | |
754 | { | |
755 | struct ipmi_req_settime sp; | |
756 | ||
757 | if (get_compat_ipmi_req_settime(&sp, compat_ptr(arg))) | |
758 | return -EFAULT; | |
759 | ||
760 | return handle_send_req(priv->user, &sp.req, | |
761 | sp.retries, sp.retry_time_ms); | |
762 | } | |
763 | case COMPAT_IPMICTL_RECEIVE_MSG: | |
764 | case COMPAT_IPMICTL_RECEIVE_MSG_TRUNC: | |
765 | { | |
18fb9442 AV |
766 | struct ipmi_recv __user *precv64; |
767 | struct ipmi_recv recv64; | |
6a94f920 AM |
768 | |
769 | if (get_compat_ipmi_recv(&recv64, compat_ptr(arg))) | |
770 | return -EFAULT; | |
771 | ||
772 | precv64 = compat_alloc_user_space(sizeof(recv64)); | |
773 | if (copy_to_user(precv64, &recv64, sizeof(recv64))) | |
774 | return -EFAULT; | |
775 | ||
776 | rc = ipmi_ioctl(filep->f_dentry->d_inode, filep, | |
777 | ((cmd == COMPAT_IPMICTL_RECEIVE_MSG) | |
778 | ? IPMICTL_RECEIVE_MSG | |
779 | : IPMICTL_RECEIVE_MSG_TRUNC), | |
18fb9442 | 780 | (unsigned long) precv64); |
6a94f920 AM |
781 | if (rc != 0) |
782 | return rc; | |
783 | ||
784 | if (copy_from_user(&recv64, precv64, sizeof(recv64))) | |
785 | return -EFAULT; | |
786 | ||
787 | if (put_compat_ipmi_recv(&recv64, compat_ptr(arg))) | |
788 | return -EFAULT; | |
789 | ||
790 | return rc; | |
791 | } | |
792 | default: | |
793 | return ipmi_ioctl(filep->f_dentry->d_inode, filep, cmd, arg); | |
794 | } | |
795 | } | |
796 | #endif | |
1da177e4 | 797 | |
62322d25 | 798 | static const struct file_operations ipmi_fops = { |
1da177e4 LT |
799 | .owner = THIS_MODULE, |
800 | .ioctl = ipmi_ioctl, | |
6a94f920 AM |
801 | #ifdef CONFIG_COMPAT |
802 | .compat_ioctl = compat_ipmi_ioctl, | |
803 | #endif | |
1da177e4 LT |
804 | .open = ipmi_open, |
805 | .release = ipmi_release, | |
806 | .fasync = ipmi_fasync, | |
807 | .poll = ipmi_poll, | |
808 | }; | |
809 | ||
810 | #define DEVICE_NAME "ipmidev" | |
811 | ||
812 | static int ipmi_major = 0; | |
813 | module_param(ipmi_major, int, 0); | |
814 | MODULE_PARM_DESC(ipmi_major, "Sets the major number of the IPMI device. By" | |
815 | " default, or if you set it to zero, it will choose the next" | |
816 | " available device. Setting it to -1 will disable the" | |
817 | " interface. Other values will set the major device number" | |
818 | " to that value."); | |
819 | ||
50c812b2 CM |
820 | /* Keep track of the devices that are registered. */ |
821 | struct ipmi_reg_list { | |
822 | dev_t dev; | |
823 | struct list_head link; | |
824 | }; | |
825 | static LIST_HEAD(reg_list); | |
826 | static DEFINE_MUTEX(reg_list_mutex); | |
827 | ||
eb51b650 | 828 | static struct class *ipmi_class; |
37e0915b | 829 | |
50c812b2 | 830 | static void ipmi_new_smi(int if_num, struct device *device) |
1da177e4 | 831 | { |
37e0915b | 832 | dev_t dev = MKDEV(ipmi_major, if_num); |
50c812b2 | 833 | struct ipmi_reg_list *entry; |
37e0915b | 834 | |
50c812b2 CM |
835 | entry = kmalloc(sizeof(*entry), GFP_KERNEL); |
836 | if (!entry) { | |
837 | printk(KERN_ERR "ipmi_devintf: Unable to create the" | |
838 | " ipmi class device link\n"); | |
839 | return; | |
840 | } | |
841 | entry->dev = dev; | |
842 | ||
843 | mutex_lock(®_list_mutex); | |
844 | class_device_create(ipmi_class, NULL, dev, device, "ipmi%d", if_num); | |
845 | list_add(&entry->link, ®_list); | |
846 | mutex_unlock(®_list_mutex); | |
1da177e4 LT |
847 | } |
848 | ||
849 | static void ipmi_smi_gone(int if_num) | |
850 | { | |
50c812b2 CM |
851 | dev_t dev = MKDEV(ipmi_major, if_num); |
852 | struct ipmi_reg_list *entry; | |
853 | ||
854 | mutex_lock(®_list_mutex); | |
855 | list_for_each_entry(entry, ®_list, link) { | |
856 | if (entry->dev == dev) { | |
857 | list_del(&entry->link); | |
858 | kfree(entry); | |
859 | break; | |
860 | } | |
861 | } | |
862 | class_device_destroy(ipmi_class, dev); | |
863 | mutex_unlock(®_list_mutex); | |
1da177e4 LT |
864 | } |
865 | ||
866 | static struct ipmi_smi_watcher smi_watcher = | |
867 | { | |
868 | .owner = THIS_MODULE, | |
869 | .new_smi = ipmi_new_smi, | |
870 | .smi_gone = ipmi_smi_gone, | |
871 | }; | |
872 | ||
873 | static __init int init_ipmi_devintf(void) | |
874 | { | |
875 | int rv; | |
876 | ||
877 | if (ipmi_major < 0) | |
878 | return -EINVAL; | |
879 | ||
1fdd75bd | 880 | printk(KERN_INFO "ipmi device interface\n"); |
1da177e4 | 881 | |
eb51b650 | 882 | ipmi_class = class_create(THIS_MODULE, "ipmi"); |
37e0915b CM |
883 | if (IS_ERR(ipmi_class)) { |
884 | printk(KERN_ERR "ipmi: can't register device class\n"); | |
885 | return PTR_ERR(ipmi_class); | |
886 | } | |
887 | ||
1da177e4 LT |
888 | rv = register_chrdev(ipmi_major, DEVICE_NAME, &ipmi_fops); |
889 | if (rv < 0) { | |
eb51b650 | 890 | class_destroy(ipmi_class); |
1da177e4 LT |
891 | printk(KERN_ERR "ipmi: can't get major %d\n", ipmi_major); |
892 | return rv; | |
893 | } | |
894 | ||
895 | if (ipmi_major == 0) { | |
896 | ipmi_major = rv; | |
897 | } | |
898 | ||
1da177e4 LT |
899 | rv = ipmi_smi_watcher_register(&smi_watcher); |
900 | if (rv) { | |
901 | unregister_chrdev(ipmi_major, DEVICE_NAME); | |
eb51b650 | 902 | class_destroy(ipmi_class); |
1da177e4 LT |
903 | printk(KERN_WARNING "ipmi: can't register smi watcher\n"); |
904 | return rv; | |
905 | } | |
906 | ||
907 | return 0; | |
908 | } | |
909 | module_init(init_ipmi_devintf); | |
910 | ||
911 | static __exit void cleanup_ipmi(void) | |
912 | { | |
50c812b2 CM |
913 | struct ipmi_reg_list *entry, *entry2; |
914 | mutex_lock(®_list_mutex); | |
915 | list_for_each_entry_safe(entry, entry2, ®_list, link) { | |
916 | list_del(&entry->link); | |
917 | class_device_destroy(ipmi_class, entry->dev); | |
918 | kfree(entry); | |
919 | } | |
920 | mutex_unlock(®_list_mutex); | |
eb51b650 | 921 | class_destroy(ipmi_class); |
1da177e4 | 922 | ipmi_smi_watcher_unregister(&smi_watcher); |
1da177e4 LT |
923 | unregister_chrdev(ipmi_major, DEVICE_NAME); |
924 | } | |
925 | module_exit(cleanup_ipmi); | |
926 | ||
927 | MODULE_LICENSE("GPL"); | |
1fdd75bd CM |
928 | MODULE_AUTHOR("Corey Minyard <minyard@mvista.com>"); |
929 | MODULE_DESCRIPTION("Linux device interface for the IPMI message handler."); |