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1/*
2 * Copyright (C) 2001 Jens Axboe <axboe@suse.de>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 *
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public Licens
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-
17 *
18 */
19#include <linux/kernel.h>
20#include <linux/errno.h>
21#include <linux/string.h>
22#include <linux/module.h>
23#include <linux/blkdev.h>
24#include <linux/capability.h>
25#include <linux/completion.h>
26#include <linux/cdrom.h>
27#include <linux/ratelimit.h>
28#include <linux/slab.h>
29#include <linux/times.h>
30#include <linux/uio.h>
31#include <asm/uaccess.h>
32
33#include <scsi/scsi.h>
34#include <scsi/scsi_ioctl.h>
35#include <scsi/scsi_cmnd.h>
36
37struct blk_cmd_filter {
38 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
39 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
40};
41
42static struct blk_cmd_filter blk_default_cmd_filter;
43
44/* Command group 3 is reserved and should never be used. */
45const unsigned char scsi_command_size_tbl[8] =
46{
47 6, 10, 10, 12,
48 16, 12, 10, 10
49};
50EXPORT_SYMBOL(scsi_command_size_tbl);
51
52#include <scsi/sg.h>
53
54static int sg_get_version(int __user *p)
55{
56 static const int sg_version_num = 30527;
57 return put_user(sg_version_num, p);
58}
59
60static int scsi_get_idlun(struct request_queue *q, int __user *p)
61{
62 return put_user(0, p);
63}
64
65static int scsi_get_bus(struct request_queue *q, int __user *p)
66{
67 return put_user(0, p);
68}
69
70static int sg_get_timeout(struct request_queue *q)
71{
72 return jiffies_to_clock_t(q->sg_timeout);
73}
74
75static int sg_set_timeout(struct request_queue *q, int __user *p)
76{
77 int timeout, err = get_user(timeout, p);
78
79 if (!err)
80 q->sg_timeout = clock_t_to_jiffies(timeout);
81
82 return err;
83}
84
85static int max_sectors_bytes(struct request_queue *q)
86{
87 unsigned int max_sectors = queue_max_sectors(q);
88
89 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
90
91 return max_sectors << 9;
92}
93
94static int sg_get_reserved_size(struct request_queue *q, int __user *p)
95{
96 int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q));
97
98 return put_user(val, p);
99}
100
101static int sg_set_reserved_size(struct request_queue *q, int __user *p)
102{
103 int size, err = get_user(size, p);
104
105 if (err)
106 return err;
107
108 if (size < 0)
109 return -EINVAL;
110
111 q->sg_reserved_size = min(size, max_sectors_bytes(q));
112 return 0;
113}
114
115/*
116 * will always return that we are ATAPI even for a real SCSI drive, I'm not
117 * so sure this is worth doing anything about (why would you care??)
118 */
119static int sg_emulated_host(struct request_queue *q, int __user *p)
120{
121 return put_user(1, p);
122}
123
124static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
125{
126 /* Basic read-only commands */
127 __set_bit(TEST_UNIT_READY, filter->read_ok);
128 __set_bit(REQUEST_SENSE, filter->read_ok);
129 __set_bit(READ_6, filter->read_ok);
130 __set_bit(READ_10, filter->read_ok);
131 __set_bit(READ_12, filter->read_ok);
132 __set_bit(READ_16, filter->read_ok);
133 __set_bit(READ_BUFFER, filter->read_ok);
134 __set_bit(READ_DEFECT_DATA, filter->read_ok);
135 __set_bit(READ_CAPACITY, filter->read_ok);
136 __set_bit(READ_LONG, filter->read_ok);
137 __set_bit(INQUIRY, filter->read_ok);
138 __set_bit(MODE_SENSE, filter->read_ok);
139 __set_bit(MODE_SENSE_10, filter->read_ok);
140 __set_bit(LOG_SENSE, filter->read_ok);
141 __set_bit(START_STOP, filter->read_ok);
142 __set_bit(GPCMD_VERIFY_10, filter->read_ok);
143 __set_bit(VERIFY_16, filter->read_ok);
144 __set_bit(REPORT_LUNS, filter->read_ok);
145 __set_bit(SERVICE_ACTION_IN_16, filter->read_ok);
146 __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
147 __set_bit(MAINTENANCE_IN, filter->read_ok);
148 __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
149
150 /* Audio CD commands */
151 __set_bit(GPCMD_PLAY_CD, filter->read_ok);
152 __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
153 __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
154 __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
155 __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
156
157 /* CD/DVD data reading */
158 __set_bit(GPCMD_READ_CD, filter->read_ok);
159 __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
160 __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
161 __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
162 __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
163 __set_bit(GPCMD_READ_HEADER, filter->read_ok);
164 __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
165 __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
166 __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
167 __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
168 __set_bit(GPCMD_SCAN, filter->read_ok);
169 __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
170 __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
171 __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
172 __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
173 __set_bit(GPCMD_SEEK, filter->read_ok);
174 __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
175
176 /* Basic writing commands */
177 __set_bit(WRITE_6, filter->write_ok);
178 __set_bit(WRITE_10, filter->write_ok);
179 __set_bit(WRITE_VERIFY, filter->write_ok);
180 __set_bit(WRITE_12, filter->write_ok);
181 __set_bit(WRITE_VERIFY_12, filter->write_ok);
182 __set_bit(WRITE_16, filter->write_ok);
183 __set_bit(WRITE_LONG, filter->write_ok);
184 __set_bit(WRITE_LONG_2, filter->write_ok);
185 __set_bit(ERASE, filter->write_ok);
186 __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
187 __set_bit(MODE_SELECT, filter->write_ok);
188 __set_bit(LOG_SELECT, filter->write_ok);
189 __set_bit(GPCMD_BLANK, filter->write_ok);
190 __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
191 __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
192 __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
193 __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
194 __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
195 __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
196 __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
197 __set_bit(GPCMD_SEND_KEY, filter->write_ok);
198 __set_bit(GPCMD_SEND_OPC, filter->write_ok);
199 __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
200 __set_bit(GPCMD_SET_SPEED, filter->write_ok);
201 __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
202 __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
203 __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
204 __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
205}
206
207int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
208{
209 struct blk_cmd_filter *filter = &blk_default_cmd_filter;
210
211 /* root can do any command. */
212 if (capable(CAP_SYS_RAWIO))
213 return 0;
214
215 /* Anybody who can open the device can do a read-safe command */
216 if (test_bit(cmd[0], filter->read_ok))
217 return 0;
218
219 /* Write-safe commands require a writable open */
220 if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
221 return 0;
222
223 return -EPERM;
224}
225EXPORT_SYMBOL(blk_verify_command);
226
227static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
228 struct sg_io_hdr *hdr, fmode_t mode)
229{
230 if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
231 return -EFAULT;
232 if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
233 return -EPERM;
234
235 /*
236 * fill in request structure
237 */
238 rq->cmd_len = hdr->cmd_len;
239
240 rq->timeout = msecs_to_jiffies(hdr->timeout);
241 if (!rq->timeout)
242 rq->timeout = q->sg_timeout;
243 if (!rq->timeout)
244 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
245 if (rq->timeout < BLK_MIN_SG_TIMEOUT)
246 rq->timeout = BLK_MIN_SG_TIMEOUT;
247
248 return 0;
249}
250
251static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
252 struct bio *bio)
253{
254 int r, ret = 0;
255
256 /*
257 * fill in all the output members
258 */
259 hdr->status = rq->errors & 0xff;
260 hdr->masked_status = status_byte(rq->errors);
261 hdr->msg_status = msg_byte(rq->errors);
262 hdr->host_status = host_byte(rq->errors);
263 hdr->driver_status = driver_byte(rq->errors);
264 hdr->info = 0;
265 if (hdr->masked_status || hdr->host_status || hdr->driver_status)
266 hdr->info |= SG_INFO_CHECK;
267 hdr->resid = rq->resid_len;
268 hdr->sb_len_wr = 0;
269
270 if (rq->sense_len && hdr->sbp) {
271 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
272
273 if (!copy_to_user(hdr->sbp, rq->sense, len))
274 hdr->sb_len_wr = len;
275 else
276 ret = -EFAULT;
277 }
278
279 r = blk_rq_unmap_user(bio);
280 if (!ret)
281 ret = r;
282
283 return ret;
284}
285
286static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
287 struct sg_io_hdr *hdr, fmode_t mode)
288{
289 unsigned long start_time;
290 ssize_t ret = 0;
291 int writing = 0;
292 int at_head = 0;
293 struct request *rq;
294 char sense[SCSI_SENSE_BUFFERSIZE];
295 struct bio *bio;
296
297 if (hdr->interface_id != 'S')
298 return -EINVAL;
299
300 if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
301 return -EIO;
302
303 if (hdr->dxfer_len)
304 switch (hdr->dxfer_direction) {
305 default:
306 return -EINVAL;
307 case SG_DXFER_TO_DEV:
308 writing = 1;
309 break;
310 case SG_DXFER_TO_FROM_DEV:
311 case SG_DXFER_FROM_DEV:
312 break;
313 }
314 if (hdr->flags & SG_FLAG_Q_AT_HEAD)
315 at_head = 1;
316
317 ret = -ENOMEM;
318 rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
319 if (IS_ERR(rq))
320 return PTR_ERR(rq);
321 blk_rq_set_block_pc(rq);
322
323 if (hdr->cmd_len > BLK_MAX_CDB) {
324 rq->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL);
325 if (!rq->cmd)
326 goto out_put_request;
327 }
328
329 ret = blk_fill_sghdr_rq(q, rq, hdr, mode);
330 if (ret < 0)
331 goto out_free_cdb;
332
333 ret = 0;
334 if (hdr->iovec_count) {
335 struct iov_iter i;
336 struct iovec *iov = NULL;
337
338 ret = import_iovec(rq_data_dir(rq),
339 hdr->dxferp, hdr->iovec_count,
340 0, &iov, &i);
341 if (ret < 0)
342 goto out_free_cdb;
343
344 /* SG_IO howto says that the shorter of the two wins */
345 iov_iter_truncate(&i, hdr->dxfer_len);
346
347 ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL);
348 kfree(iov);
349 } else if (hdr->dxfer_len)
350 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
351 GFP_KERNEL);
352
353 if (ret)
354 goto out_free_cdb;
355
356 bio = rq->bio;
357 memset(sense, 0, sizeof(sense));
358 rq->sense = sense;
359 rq->sense_len = 0;
360 rq->retries = 0;
361
362 start_time = jiffies;
363
364 /* ignore return value. All information is passed back to caller
365 * (if he doesn't check that is his problem).
366 * N.B. a non-zero SCSI status is _not_ necessarily an error.
367 */
368 blk_execute_rq(q, bd_disk, rq, at_head);
369
370 hdr->duration = jiffies_to_msecs(jiffies - start_time);
371
372 ret = blk_complete_sghdr_rq(rq, hdr, bio);
373
374out_free_cdb:
375 if (rq->cmd != rq->__cmd)
376 kfree(rq->cmd);
377out_put_request:
378 blk_put_request(rq);
379 return ret;
380}
381
382/**
383 * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
384 * @file: file this ioctl operates on (optional)
385 * @q: request queue to send scsi commands down
386 * @disk: gendisk to operate on (option)
387 * @sic: userspace structure describing the command to perform
388 *
389 * Send down the scsi command described by @sic to the device below
390 * the request queue @q. If @file is non-NULL it's used to perform
391 * fine-grained permission checks that allow users to send down
392 * non-destructive SCSI commands. If the caller has a struct gendisk
393 * available it should be passed in as @disk to allow the low level
394 * driver to use the information contained in it. A non-NULL @disk
395 * is only allowed if the caller knows that the low level driver doesn't
396 * need it (e.g. in the scsi subsystem).
397 *
398 * Notes:
399 * - This interface is deprecated - users should use the SG_IO
400 * interface instead, as this is a more flexible approach to
401 * performing SCSI commands on a device.
402 * - The SCSI command length is determined by examining the 1st byte
403 * of the given command. There is no way to override this.
404 * - Data transfers are limited to PAGE_SIZE
405 * - The length (x + y) must be at least OMAX_SB_LEN bytes long to
406 * accommodate the sense buffer when an error occurs.
407 * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
408 * old code will not be surprised.
409 * - If a Unix error occurs (e.g. ENOMEM) then the user will receive
410 * a negative return and the Unix error code in 'errno'.
411 * If the SCSI command succeeds then 0 is returned.
412 * Positive numbers returned are the compacted SCSI error codes (4
413 * bytes in one int) where the lowest byte is the SCSI status.
414 */
415#define OMAX_SB_LEN 16 /* For backward compatibility */
416int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
417 struct scsi_ioctl_command __user *sic)
418{
419 struct request *rq;
420 int err;
421 unsigned int in_len, out_len, bytes, opcode, cmdlen;
422 char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
423
424 if (!sic)
425 return -EINVAL;
426
427 /*
428 * get in an out lengths, verify they don't exceed a page worth of data
429 */
430 if (get_user(in_len, &sic->inlen))
431 return -EFAULT;
432 if (get_user(out_len, &sic->outlen))
433 return -EFAULT;
434 if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
435 return -EINVAL;
436 if (get_user(opcode, sic->data))
437 return -EFAULT;
438
439 bytes = max(in_len, out_len);
440 if (bytes) {
441 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
442 if (!buffer)
443 return -ENOMEM;
444
445 }
446
447 rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_RECLAIM);
448 if (IS_ERR(rq)) {
449 err = PTR_ERR(rq);
450 goto error_free_buffer;
451 }
452 blk_rq_set_block_pc(rq);
453
454 cmdlen = COMMAND_SIZE(opcode);
455
456 /*
457 * get command and data to send to device, if any
458 */
459 err = -EFAULT;
460 rq->cmd_len = cmdlen;
461 if (copy_from_user(rq->cmd, sic->data, cmdlen))
462 goto error;
463
464 if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
465 goto error;
466
467 err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
468 if (err)
469 goto error;
470
471 /* default. possible overriden later */
472 rq->retries = 5;
473
474 switch (opcode) {
475 case SEND_DIAGNOSTIC:
476 case FORMAT_UNIT:
477 rq->timeout = FORMAT_UNIT_TIMEOUT;
478 rq->retries = 1;
479 break;
480 case START_STOP:
481 rq->timeout = START_STOP_TIMEOUT;
482 break;
483 case MOVE_MEDIUM:
484 rq->timeout = MOVE_MEDIUM_TIMEOUT;
485 break;
486 case READ_ELEMENT_STATUS:
487 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
488 break;
489 case READ_DEFECT_DATA:
490 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
491 rq->retries = 1;
492 break;
493 default:
494 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
495 break;
496 }
497
498 if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_RECLAIM)) {
499 err = DRIVER_ERROR << 24;
500 goto error;
501 }
502
503 memset(sense, 0, sizeof(sense));
504 rq->sense = sense;
505 rq->sense_len = 0;
506
507 blk_execute_rq(q, disk, rq, 0);
508
509 err = rq->errors & 0xff; /* only 8 bit SCSI status */
510 if (err) {
511 if (rq->sense_len && rq->sense) {
512 bytes = (OMAX_SB_LEN > rq->sense_len) ?
513 rq->sense_len : OMAX_SB_LEN;
514 if (copy_to_user(sic->data, rq->sense, bytes))
515 err = -EFAULT;
516 }
517 } else {
518 if (copy_to_user(sic->data, buffer, out_len))
519 err = -EFAULT;
520 }
521
522error:
523 blk_put_request(rq);
524
525error_free_buffer:
526 kfree(buffer);
527
528 return err;
529}
530EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
531
532/* Send basic block requests */
533static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
534 int cmd, int data)
535{
536 struct request *rq;
537 int err;
538
539 rq = blk_get_request(q, WRITE, __GFP_RECLAIM);
540 if (IS_ERR(rq))
541 return PTR_ERR(rq);
542 blk_rq_set_block_pc(rq);
543 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
544 rq->cmd[0] = cmd;
545 rq->cmd[4] = data;
546 rq->cmd_len = 6;
547 err = blk_execute_rq(q, bd_disk, rq, 0);
548 blk_put_request(rq);
549
550 return err;
551}
552
553static inline int blk_send_start_stop(struct request_queue *q,
554 struct gendisk *bd_disk, int data)
555{
556 return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
557}
558
559int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
560 unsigned int cmd, void __user *arg)
561{
562 int err;
563
564 if (!q)
565 return -ENXIO;
566
567 switch (cmd) {
568 /*
569 * new sgv3 interface
570 */
571 case SG_GET_VERSION_NUM:
572 err = sg_get_version(arg);
573 break;
574 case SCSI_IOCTL_GET_IDLUN:
575 err = scsi_get_idlun(q, arg);
576 break;
577 case SCSI_IOCTL_GET_BUS_NUMBER:
578 err = scsi_get_bus(q, arg);
579 break;
580 case SG_SET_TIMEOUT:
581 err = sg_set_timeout(q, arg);
582 break;
583 case SG_GET_TIMEOUT:
584 err = sg_get_timeout(q);
585 break;
586 case SG_GET_RESERVED_SIZE:
587 err = sg_get_reserved_size(q, arg);
588 break;
589 case SG_SET_RESERVED_SIZE:
590 err = sg_set_reserved_size(q, arg);
591 break;
592 case SG_EMULATED_HOST:
593 err = sg_emulated_host(q, arg);
594 break;
595 case SG_IO: {
596 struct sg_io_hdr hdr;
597
598 err = -EFAULT;
599 if (copy_from_user(&hdr, arg, sizeof(hdr)))
600 break;
601 err = sg_io(q, bd_disk, &hdr, mode);
602 if (err == -EFAULT)
603 break;
604
605 if (copy_to_user(arg, &hdr, sizeof(hdr)))
606 err = -EFAULT;
607 break;
608 }
609 case CDROM_SEND_PACKET: {
610 struct cdrom_generic_command cgc;
611 struct sg_io_hdr hdr;
612
613 err = -EFAULT;
614 if (copy_from_user(&cgc, arg, sizeof(cgc)))
615 break;
616 cgc.timeout = clock_t_to_jiffies(cgc.timeout);
617 memset(&hdr, 0, sizeof(hdr));
618 hdr.interface_id = 'S';
619 hdr.cmd_len = sizeof(cgc.cmd);
620 hdr.dxfer_len = cgc.buflen;
621 err = 0;
622 switch (cgc.data_direction) {
623 case CGC_DATA_UNKNOWN:
624 hdr.dxfer_direction = SG_DXFER_UNKNOWN;
625 break;
626 case CGC_DATA_WRITE:
627 hdr.dxfer_direction = SG_DXFER_TO_DEV;
628 break;
629 case CGC_DATA_READ:
630 hdr.dxfer_direction = SG_DXFER_FROM_DEV;
631 break;
632 case CGC_DATA_NONE:
633 hdr.dxfer_direction = SG_DXFER_NONE;
634 break;
635 default:
636 err = -EINVAL;
637 }
638 if (err)
639 break;
640
641 hdr.dxferp = cgc.buffer;
642 hdr.sbp = cgc.sense;
643 if (hdr.sbp)
644 hdr.mx_sb_len = sizeof(struct request_sense);
645 hdr.timeout = jiffies_to_msecs(cgc.timeout);
646 hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
647 hdr.cmd_len = sizeof(cgc.cmd);
648
649 err = sg_io(q, bd_disk, &hdr, mode);
650 if (err == -EFAULT)
651 break;
652
653 if (hdr.status)
654 err = -EIO;
655
656 cgc.stat = err;
657 cgc.buflen = hdr.resid;
658 if (copy_to_user(arg, &cgc, sizeof(cgc)))
659 err = -EFAULT;
660
661 break;
662 }
663
664 /*
665 * old junk scsi send command ioctl
666 */
667 case SCSI_IOCTL_SEND_COMMAND:
668 printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
669 err = -EINVAL;
670 if (!arg)
671 break;
672
673 err = sg_scsi_ioctl(q, bd_disk, mode, arg);
674 break;
675 case CDROMCLOSETRAY:
676 err = blk_send_start_stop(q, bd_disk, 0x03);
677 break;
678 case CDROMEJECT:
679 err = blk_send_start_stop(q, bd_disk, 0x02);
680 break;
681 default:
682 err = -ENOTTY;
683 }
684
685 return err;
686}
687EXPORT_SYMBOL(scsi_cmd_ioctl);
688
689int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
690{
691 if (bd && bd == bd->bd_contains)
692 return 0;
693
694 /* Actually none of these is particularly useful on a partition,
695 * but they are safe.
696 */
697 switch (cmd) {
698 case SCSI_IOCTL_GET_IDLUN:
699 case SCSI_IOCTL_GET_BUS_NUMBER:
700 case SCSI_IOCTL_GET_PCI:
701 case SCSI_IOCTL_PROBE_HOST:
702 case SG_GET_VERSION_NUM:
703 case SG_SET_TIMEOUT:
704 case SG_GET_TIMEOUT:
705 case SG_GET_RESERVED_SIZE:
706 case SG_SET_RESERVED_SIZE:
707 case SG_EMULATED_HOST:
708 return 0;
709 case CDROM_GET_CAPABILITY:
710 /* Keep this until we remove the printk below. udev sends it
711 * and we do not want to spam dmesg about it. CD-ROMs do
712 * not have partitions, so we get here only for disks.
713 */
714 return -ENOIOCTLCMD;
715 default:
716 break;
717 }
718
719 if (capable(CAP_SYS_RAWIO))
720 return 0;
721
722 /* In particular, rule out all resets and host-specific ioctls. */
723 printk_ratelimited(KERN_WARNING
724 "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
725
726 return -ENOIOCTLCMD;
727}
728EXPORT_SYMBOL(scsi_verify_blk_ioctl);
729
730int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
731 unsigned int cmd, void __user *arg)
732{
733 int ret;
734
735 ret = scsi_verify_blk_ioctl(bd, cmd);
736 if (ret < 0)
737 return ret;
738
739 return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
740}
741EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
742
743static int __init blk_scsi_ioctl_init(void)
744{
745 blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
746 return 0;
747}
748fs_initcall(blk_scsi_ioctl_init);
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2001 Jens Axboe <axboe@suse.de>
4 */
5#include <linux/kernel.h>
6#include <linux/errno.h>
7#include <linux/string.h>
8#include <linux/module.h>
9#include <linux/blkdev.h>
10#include <linux/capability.h>
11#include <linux/completion.h>
12#include <linux/cdrom.h>
13#include <linux/ratelimit.h>
14#include <linux/slab.h>
15#include <linux/times.h>
16#include <linux/uio.h>
17#include <linux/uaccess.h>
18
19#include <scsi/scsi.h>
20#include <scsi/scsi_ioctl.h>
21#include <scsi/scsi_cmnd.h>
22
23struct blk_cmd_filter {
24 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
25 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
26};
27
28static struct blk_cmd_filter blk_default_cmd_filter;
29
30/* Command group 3 is reserved and should never be used. */
31const unsigned char scsi_command_size_tbl[8] =
32{
33 6, 10, 10, 12,
34 16, 12, 10, 10
35};
36EXPORT_SYMBOL(scsi_command_size_tbl);
37
38#include <scsi/sg.h>
39
40static int sg_get_version(int __user *p)
41{
42 static const int sg_version_num = 30527;
43 return put_user(sg_version_num, p);
44}
45
46static int scsi_get_idlun(struct request_queue *q, int __user *p)
47{
48 return put_user(0, p);
49}
50
51static int scsi_get_bus(struct request_queue *q, int __user *p)
52{
53 return put_user(0, p);
54}
55
56static int sg_get_timeout(struct request_queue *q)
57{
58 return jiffies_to_clock_t(q->sg_timeout);
59}
60
61static int sg_set_timeout(struct request_queue *q, int __user *p)
62{
63 int timeout, err = get_user(timeout, p);
64
65 if (!err)
66 q->sg_timeout = clock_t_to_jiffies(timeout);
67
68 return err;
69}
70
71static int max_sectors_bytes(struct request_queue *q)
72{
73 unsigned int max_sectors = queue_max_sectors(q);
74
75 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9);
76
77 return max_sectors << 9;
78}
79
80static int sg_get_reserved_size(struct request_queue *q, int __user *p)
81{
82 int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q));
83
84 return put_user(val, p);
85}
86
87static int sg_set_reserved_size(struct request_queue *q, int __user *p)
88{
89 int size, err = get_user(size, p);
90
91 if (err)
92 return err;
93
94 if (size < 0)
95 return -EINVAL;
96
97 q->sg_reserved_size = min(size, max_sectors_bytes(q));
98 return 0;
99}
100
101/*
102 * will always return that we are ATAPI even for a real SCSI drive, I'm not
103 * so sure this is worth doing anything about (why would you care??)
104 */
105static int sg_emulated_host(struct request_queue *q, int __user *p)
106{
107 return put_user(1, p);
108}
109
110static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
111{
112 /* Basic read-only commands */
113 __set_bit(TEST_UNIT_READY, filter->read_ok);
114 __set_bit(REQUEST_SENSE, filter->read_ok);
115 __set_bit(READ_6, filter->read_ok);
116 __set_bit(READ_10, filter->read_ok);
117 __set_bit(READ_12, filter->read_ok);
118 __set_bit(READ_16, filter->read_ok);
119 __set_bit(READ_BUFFER, filter->read_ok);
120 __set_bit(READ_DEFECT_DATA, filter->read_ok);
121 __set_bit(READ_CAPACITY, filter->read_ok);
122 __set_bit(READ_LONG, filter->read_ok);
123 __set_bit(INQUIRY, filter->read_ok);
124 __set_bit(MODE_SENSE, filter->read_ok);
125 __set_bit(MODE_SENSE_10, filter->read_ok);
126 __set_bit(LOG_SENSE, filter->read_ok);
127 __set_bit(START_STOP, filter->read_ok);
128 __set_bit(GPCMD_VERIFY_10, filter->read_ok);
129 __set_bit(VERIFY_16, filter->read_ok);
130 __set_bit(REPORT_LUNS, filter->read_ok);
131 __set_bit(SERVICE_ACTION_IN_16, filter->read_ok);
132 __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
133 __set_bit(MAINTENANCE_IN, filter->read_ok);
134 __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
135
136 /* Audio CD commands */
137 __set_bit(GPCMD_PLAY_CD, filter->read_ok);
138 __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
139 __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
140 __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
141 __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
142
143 /* CD/DVD data reading */
144 __set_bit(GPCMD_READ_CD, filter->read_ok);
145 __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
146 __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
147 __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
148 __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
149 __set_bit(GPCMD_READ_HEADER, filter->read_ok);
150 __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
151 __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
152 __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
153 __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
154 __set_bit(GPCMD_SCAN, filter->read_ok);
155 __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
156 __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
157 __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
158 __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
159 __set_bit(GPCMD_SEEK, filter->read_ok);
160 __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
161
162 /* Basic writing commands */
163 __set_bit(WRITE_6, filter->write_ok);
164 __set_bit(WRITE_10, filter->write_ok);
165 __set_bit(WRITE_VERIFY, filter->write_ok);
166 __set_bit(WRITE_12, filter->write_ok);
167 __set_bit(WRITE_VERIFY_12, filter->write_ok);
168 __set_bit(WRITE_16, filter->write_ok);
169 __set_bit(WRITE_LONG, filter->write_ok);
170 __set_bit(WRITE_LONG_2, filter->write_ok);
171 __set_bit(WRITE_SAME, filter->write_ok);
172 __set_bit(WRITE_SAME_16, filter->write_ok);
173 __set_bit(WRITE_SAME_32, filter->write_ok);
174 __set_bit(ERASE, filter->write_ok);
175 __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
176 __set_bit(MODE_SELECT, filter->write_ok);
177 __set_bit(LOG_SELECT, filter->write_ok);
178 __set_bit(GPCMD_BLANK, filter->write_ok);
179 __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
180 __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
181 __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
182 __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
183 __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
184 __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
185 __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
186 __set_bit(GPCMD_SEND_KEY, filter->write_ok);
187 __set_bit(GPCMD_SEND_OPC, filter->write_ok);
188 __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
189 __set_bit(GPCMD_SET_SPEED, filter->write_ok);
190 __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
191 __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
192 __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
193 __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
194}
195
196int blk_verify_command(unsigned char *cmd, fmode_t mode)
197{
198 struct blk_cmd_filter *filter = &blk_default_cmd_filter;
199
200 /* root can do any command. */
201 if (capable(CAP_SYS_RAWIO))
202 return 0;
203
204 /* Anybody who can open the device can do a read-safe command */
205 if (test_bit(cmd[0], filter->read_ok))
206 return 0;
207
208 /* Write-safe commands require a writable open */
209 if (test_bit(cmd[0], filter->write_ok) && (mode & FMODE_WRITE))
210 return 0;
211
212 return -EPERM;
213}
214EXPORT_SYMBOL(blk_verify_command);
215
216static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
217 struct sg_io_hdr *hdr, fmode_t mode)
218{
219 struct scsi_request *req = scsi_req(rq);
220
221 if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len))
222 return -EFAULT;
223 if (blk_verify_command(req->cmd, mode))
224 return -EPERM;
225
226 /*
227 * fill in request structure
228 */
229 req->cmd_len = hdr->cmd_len;
230
231 rq->timeout = msecs_to_jiffies(hdr->timeout);
232 if (!rq->timeout)
233 rq->timeout = q->sg_timeout;
234 if (!rq->timeout)
235 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
236 if (rq->timeout < BLK_MIN_SG_TIMEOUT)
237 rq->timeout = BLK_MIN_SG_TIMEOUT;
238
239 return 0;
240}
241
242static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
243 struct bio *bio)
244{
245 struct scsi_request *req = scsi_req(rq);
246 int r, ret = 0;
247
248 /*
249 * fill in all the output members
250 */
251 hdr->status = req->result & 0xff;
252 hdr->masked_status = status_byte(req->result);
253 hdr->msg_status = msg_byte(req->result);
254 hdr->host_status = host_byte(req->result);
255 hdr->driver_status = driver_byte(req->result);
256 hdr->info = 0;
257 if (hdr->masked_status || hdr->host_status || hdr->driver_status)
258 hdr->info |= SG_INFO_CHECK;
259 hdr->resid = req->resid_len;
260 hdr->sb_len_wr = 0;
261
262 if (req->sense_len && hdr->sbp) {
263 int len = min((unsigned int) hdr->mx_sb_len, req->sense_len);
264
265 if (!copy_to_user(hdr->sbp, req->sense, len))
266 hdr->sb_len_wr = len;
267 else
268 ret = -EFAULT;
269 }
270
271 r = blk_rq_unmap_user(bio);
272 if (!ret)
273 ret = r;
274
275 return ret;
276}
277
278static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
279 struct sg_io_hdr *hdr, fmode_t mode)
280{
281 unsigned long start_time;
282 ssize_t ret = 0;
283 int writing = 0;
284 int at_head = 0;
285 struct request *rq;
286 struct scsi_request *req;
287 struct bio *bio;
288
289 if (hdr->interface_id != 'S')
290 return -EINVAL;
291
292 if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
293 return -EIO;
294
295 if (hdr->dxfer_len)
296 switch (hdr->dxfer_direction) {
297 default:
298 return -EINVAL;
299 case SG_DXFER_TO_DEV:
300 writing = 1;
301 break;
302 case SG_DXFER_TO_FROM_DEV:
303 case SG_DXFER_FROM_DEV:
304 break;
305 }
306 if (hdr->flags & SG_FLAG_Q_AT_HEAD)
307 at_head = 1;
308
309 ret = -ENOMEM;
310 rq = blk_get_request(q, writing ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
311 if (IS_ERR(rq))
312 return PTR_ERR(rq);
313 req = scsi_req(rq);
314
315 if (hdr->cmd_len > BLK_MAX_CDB) {
316 req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL);
317 if (!req->cmd)
318 goto out_put_request;
319 }
320
321 ret = blk_fill_sghdr_rq(q, rq, hdr, mode);
322 if (ret < 0)
323 goto out_free_cdb;
324
325 ret = 0;
326 if (hdr->iovec_count) {
327 struct iov_iter i;
328 struct iovec *iov = NULL;
329
330 ret = import_iovec(rq_data_dir(rq),
331 hdr->dxferp, hdr->iovec_count,
332 0, &iov, &i);
333 if (ret < 0)
334 goto out_free_cdb;
335
336 /* SG_IO howto says that the shorter of the two wins */
337 iov_iter_truncate(&i, hdr->dxfer_len);
338
339 ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL);
340 kfree(iov);
341 } else if (hdr->dxfer_len)
342 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
343 GFP_KERNEL);
344
345 if (ret)
346 goto out_free_cdb;
347
348 bio = rq->bio;
349 req->retries = 0;
350
351 start_time = jiffies;
352
353 /* ignore return value. All information is passed back to caller
354 * (if he doesn't check that is his problem).
355 * N.B. a non-zero SCSI status is _not_ necessarily an error.
356 */
357 blk_execute_rq(q, bd_disk, rq, at_head);
358
359 hdr->duration = jiffies_to_msecs(jiffies - start_time);
360
361 ret = blk_complete_sghdr_rq(rq, hdr, bio);
362
363out_free_cdb:
364 scsi_req_free_cmd(req);
365out_put_request:
366 blk_put_request(rq);
367 return ret;
368}
369
370/**
371 * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
372 * @q: request queue to send scsi commands down
373 * @disk: gendisk to operate on (option)
374 * @mode: mode used to open the file through which the ioctl has been
375 * submitted
376 * @sic: userspace structure describing the command to perform
377 *
378 * Send down the scsi command described by @sic to the device below
379 * the request queue @q. If @file is non-NULL it's used to perform
380 * fine-grained permission checks that allow users to send down
381 * non-destructive SCSI commands. If the caller has a struct gendisk
382 * available it should be passed in as @disk to allow the low level
383 * driver to use the information contained in it. A non-NULL @disk
384 * is only allowed if the caller knows that the low level driver doesn't
385 * need it (e.g. in the scsi subsystem).
386 *
387 * Notes:
388 * - This interface is deprecated - users should use the SG_IO
389 * interface instead, as this is a more flexible approach to
390 * performing SCSI commands on a device.
391 * - The SCSI command length is determined by examining the 1st byte
392 * of the given command. There is no way to override this.
393 * - Data transfers are limited to PAGE_SIZE
394 * - The length (x + y) must be at least OMAX_SB_LEN bytes long to
395 * accommodate the sense buffer when an error occurs.
396 * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
397 * old code will not be surprised.
398 * - If a Unix error occurs (e.g. ENOMEM) then the user will receive
399 * a negative return and the Unix error code in 'errno'.
400 * If the SCSI command succeeds then 0 is returned.
401 * Positive numbers returned are the compacted SCSI error codes (4
402 * bytes in one int) where the lowest byte is the SCSI status.
403 */
404int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
405 struct scsi_ioctl_command __user *sic)
406{
407 enum { OMAX_SB_LEN = 16 }; /* For backward compatibility */
408 struct request *rq;
409 struct scsi_request *req;
410 int err;
411 unsigned int in_len, out_len, bytes, opcode, cmdlen;
412 char *buffer = NULL;
413
414 if (!sic)
415 return -EINVAL;
416
417 /*
418 * get in an out lengths, verify they don't exceed a page worth of data
419 */
420 if (get_user(in_len, &sic->inlen))
421 return -EFAULT;
422 if (get_user(out_len, &sic->outlen))
423 return -EFAULT;
424 if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
425 return -EINVAL;
426 if (get_user(opcode, sic->data))
427 return -EFAULT;
428
429 bytes = max(in_len, out_len);
430 if (bytes) {
431 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
432 if (!buffer)
433 return -ENOMEM;
434
435 }
436
437 rq = blk_get_request(q, in_len ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0);
438 if (IS_ERR(rq)) {
439 err = PTR_ERR(rq);
440 goto error_free_buffer;
441 }
442 req = scsi_req(rq);
443
444 cmdlen = COMMAND_SIZE(opcode);
445
446 /*
447 * get command and data to send to device, if any
448 */
449 err = -EFAULT;
450 req->cmd_len = cmdlen;
451 if (copy_from_user(req->cmd, sic->data, cmdlen))
452 goto error;
453
454 if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
455 goto error;
456
457 err = blk_verify_command(req->cmd, mode);
458 if (err)
459 goto error;
460
461 /* default. possible overriden later */
462 req->retries = 5;
463
464 switch (opcode) {
465 case SEND_DIAGNOSTIC:
466 case FORMAT_UNIT:
467 rq->timeout = FORMAT_UNIT_TIMEOUT;
468 req->retries = 1;
469 break;
470 case START_STOP:
471 rq->timeout = START_STOP_TIMEOUT;
472 break;
473 case MOVE_MEDIUM:
474 rq->timeout = MOVE_MEDIUM_TIMEOUT;
475 break;
476 case READ_ELEMENT_STATUS:
477 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
478 break;
479 case READ_DEFECT_DATA:
480 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
481 req->retries = 1;
482 break;
483 default:
484 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
485 break;
486 }
487
488 if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, GFP_NOIO)) {
489 err = DRIVER_ERROR << 24;
490 goto error;
491 }
492
493 blk_execute_rq(q, disk, rq, 0);
494
495 err = req->result & 0xff; /* only 8 bit SCSI status */
496 if (err) {
497 if (req->sense_len && req->sense) {
498 bytes = (OMAX_SB_LEN > req->sense_len) ?
499 req->sense_len : OMAX_SB_LEN;
500 if (copy_to_user(sic->data, req->sense, bytes))
501 err = -EFAULT;
502 }
503 } else {
504 if (copy_to_user(sic->data, buffer, out_len))
505 err = -EFAULT;
506 }
507
508error:
509 blk_put_request(rq);
510
511error_free_buffer:
512 kfree(buffer);
513
514 return err;
515}
516EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
517
518/* Send basic block requests */
519static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
520 int cmd, int data)
521{
522 struct request *rq;
523 int err;
524
525 rq = blk_get_request(q, REQ_OP_SCSI_OUT, 0);
526 if (IS_ERR(rq))
527 return PTR_ERR(rq);
528 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
529 scsi_req(rq)->cmd[0] = cmd;
530 scsi_req(rq)->cmd[4] = data;
531 scsi_req(rq)->cmd_len = 6;
532 blk_execute_rq(q, bd_disk, rq, 0);
533 err = scsi_req(rq)->result ? -EIO : 0;
534 blk_put_request(rq);
535
536 return err;
537}
538
539static inline int blk_send_start_stop(struct request_queue *q,
540 struct gendisk *bd_disk, int data)
541{
542 return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
543}
544
545int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
546 unsigned int cmd, void __user *arg)
547{
548 int err;
549
550 if (!q)
551 return -ENXIO;
552
553 switch (cmd) {
554 /*
555 * new sgv3 interface
556 */
557 case SG_GET_VERSION_NUM:
558 err = sg_get_version(arg);
559 break;
560 case SCSI_IOCTL_GET_IDLUN:
561 err = scsi_get_idlun(q, arg);
562 break;
563 case SCSI_IOCTL_GET_BUS_NUMBER:
564 err = scsi_get_bus(q, arg);
565 break;
566 case SG_SET_TIMEOUT:
567 err = sg_set_timeout(q, arg);
568 break;
569 case SG_GET_TIMEOUT:
570 err = sg_get_timeout(q);
571 break;
572 case SG_GET_RESERVED_SIZE:
573 err = sg_get_reserved_size(q, arg);
574 break;
575 case SG_SET_RESERVED_SIZE:
576 err = sg_set_reserved_size(q, arg);
577 break;
578 case SG_EMULATED_HOST:
579 err = sg_emulated_host(q, arg);
580 break;
581 case SG_IO: {
582 struct sg_io_hdr hdr;
583
584 err = -EFAULT;
585 if (copy_from_user(&hdr, arg, sizeof(hdr)))
586 break;
587 err = sg_io(q, bd_disk, &hdr, mode);
588 if (err == -EFAULT)
589 break;
590
591 if (copy_to_user(arg, &hdr, sizeof(hdr)))
592 err = -EFAULT;
593 break;
594 }
595 case CDROM_SEND_PACKET: {
596 struct cdrom_generic_command cgc;
597 struct sg_io_hdr hdr;
598
599 err = -EFAULT;
600 if (copy_from_user(&cgc, arg, sizeof(cgc)))
601 break;
602 cgc.timeout = clock_t_to_jiffies(cgc.timeout);
603 memset(&hdr, 0, sizeof(hdr));
604 hdr.interface_id = 'S';
605 hdr.cmd_len = sizeof(cgc.cmd);
606 hdr.dxfer_len = cgc.buflen;
607 err = 0;
608 switch (cgc.data_direction) {
609 case CGC_DATA_UNKNOWN:
610 hdr.dxfer_direction = SG_DXFER_UNKNOWN;
611 break;
612 case CGC_DATA_WRITE:
613 hdr.dxfer_direction = SG_DXFER_TO_DEV;
614 break;
615 case CGC_DATA_READ:
616 hdr.dxfer_direction = SG_DXFER_FROM_DEV;
617 break;
618 case CGC_DATA_NONE:
619 hdr.dxfer_direction = SG_DXFER_NONE;
620 break;
621 default:
622 err = -EINVAL;
623 }
624 if (err)
625 break;
626
627 hdr.dxferp = cgc.buffer;
628 hdr.sbp = cgc.sense;
629 if (hdr.sbp)
630 hdr.mx_sb_len = sizeof(struct request_sense);
631 hdr.timeout = jiffies_to_msecs(cgc.timeout);
632 hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
633 hdr.cmd_len = sizeof(cgc.cmd);
634
635 err = sg_io(q, bd_disk, &hdr, mode);
636 if (err == -EFAULT)
637 break;
638
639 if (hdr.status)
640 err = -EIO;
641
642 cgc.stat = err;
643 cgc.buflen = hdr.resid;
644 if (copy_to_user(arg, &cgc, sizeof(cgc)))
645 err = -EFAULT;
646
647 break;
648 }
649
650 /*
651 * old junk scsi send command ioctl
652 */
653 case SCSI_IOCTL_SEND_COMMAND:
654 printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
655 err = -EINVAL;
656 if (!arg)
657 break;
658
659 err = sg_scsi_ioctl(q, bd_disk, mode, arg);
660 break;
661 case CDROMCLOSETRAY:
662 err = blk_send_start_stop(q, bd_disk, 0x03);
663 break;
664 case CDROMEJECT:
665 err = blk_send_start_stop(q, bd_disk, 0x02);
666 break;
667 default:
668 err = -ENOTTY;
669 }
670
671 return err;
672}
673EXPORT_SYMBOL(scsi_cmd_ioctl);
674
675int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
676{
677 if (bd && bd == bd->bd_contains)
678 return 0;
679
680 if (capable(CAP_SYS_RAWIO))
681 return 0;
682
683 return -ENOIOCTLCMD;
684}
685EXPORT_SYMBOL(scsi_verify_blk_ioctl);
686
687int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
688 unsigned int cmd, void __user *arg)
689{
690 int ret;
691
692 ret = scsi_verify_blk_ioctl(bd, cmd);
693 if (ret < 0)
694 return ret;
695
696 return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
697}
698EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
699
700/**
701 * scsi_req_init - initialize certain fields of a scsi_request structure
702 * @req: Pointer to a scsi_request structure.
703 * Initializes .__cmd[], .cmd, .cmd_len and .sense_len but no other members
704 * of struct scsi_request.
705 */
706void scsi_req_init(struct scsi_request *req)
707{
708 memset(req->__cmd, 0, sizeof(req->__cmd));
709 req->cmd = req->__cmd;
710 req->cmd_len = BLK_MAX_CDB;
711 req->sense_len = 0;
712}
713EXPORT_SYMBOL(scsi_req_init);
714
715static int __init blk_scsi_ioctl_init(void)
716{
717 blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
718 return 0;
719}
720fs_initcall(blk_scsi_ioctl_init);