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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/*
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 <asm/uaccess.h>
31
32#include <scsi/scsi.h>
33#include <scsi/scsi_ioctl.h>
34#include <scsi/scsi_cmnd.h>
35
36struct blk_cmd_filter {
37 unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
38 unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
39};
40
41static struct blk_cmd_filter blk_default_cmd_filter;
42
43/* Command group 3 is reserved and should never be used. */
44const unsigned char scsi_command_size_tbl[8] =
45{
46 6, 10, 10, 12,
47 16, 12, 10, 10
48};
49EXPORT_SYMBOL(scsi_command_size_tbl);
50
51#include <scsi/sg.h>
52
53static int sg_get_version(int __user *p)
54{
55 static const int sg_version_num = 30527;
56 return put_user(sg_version_num, p);
57}
58
59static int scsi_get_idlun(struct request_queue *q, int __user *p)
60{
61 return put_user(0, p);
62}
63
64static int scsi_get_bus(struct request_queue *q, int __user *p)
65{
66 return put_user(0, p);
67}
68
69static int sg_get_timeout(struct request_queue *q)
70{
71 return jiffies_to_clock_t(q->sg_timeout);
72}
73
74static int sg_set_timeout(struct request_queue *q, int __user *p)
75{
76 int timeout, err = get_user(timeout, p);
77
78 if (!err)
79 q->sg_timeout = clock_t_to_jiffies(timeout);
80
81 return err;
82}
83
84static int sg_get_reserved_size(struct request_queue *q, int __user *p)
85{
86 unsigned val = min(q->sg_reserved_size, queue_max_sectors(q) << 9);
87
88 return put_user(val, p);
89}
90
91static int sg_set_reserved_size(struct request_queue *q, int __user *p)
92{
93 int size, err = get_user(size, p);
94
95 if (err)
96 return err;
97
98 if (size < 0)
99 return -EINVAL;
100 if (size > (queue_max_sectors(q) << 9))
101 size = queue_max_sectors(q) << 9;
102
103 q->sg_reserved_size = size;
104 return 0;
105}
106
107/*
108 * will always return that we are ATAPI even for a real SCSI drive, I'm not
109 * so sure this is worth doing anything about (why would you care??)
110 */
111static int sg_emulated_host(struct request_queue *q, int __user *p)
112{
113 return put_user(1, p);
114}
115
116static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter)
117{
118 /* Basic read-only commands */
119 __set_bit(TEST_UNIT_READY, filter->read_ok);
120 __set_bit(REQUEST_SENSE, filter->read_ok);
121 __set_bit(READ_6, filter->read_ok);
122 __set_bit(READ_10, filter->read_ok);
123 __set_bit(READ_12, filter->read_ok);
124 __set_bit(READ_16, filter->read_ok);
125 __set_bit(READ_BUFFER, filter->read_ok);
126 __set_bit(READ_DEFECT_DATA, filter->read_ok);
127 __set_bit(READ_CAPACITY, filter->read_ok);
128 __set_bit(READ_LONG, filter->read_ok);
129 __set_bit(INQUIRY, filter->read_ok);
130 __set_bit(MODE_SENSE, filter->read_ok);
131 __set_bit(MODE_SENSE_10, filter->read_ok);
132 __set_bit(LOG_SENSE, filter->read_ok);
133 __set_bit(START_STOP, filter->read_ok);
134 __set_bit(GPCMD_VERIFY_10, filter->read_ok);
135 __set_bit(VERIFY_16, filter->read_ok);
136 __set_bit(REPORT_LUNS, filter->read_ok);
137 __set_bit(SERVICE_ACTION_IN, filter->read_ok);
138 __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok);
139 __set_bit(MAINTENANCE_IN, filter->read_ok);
140 __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok);
141
142 /* Audio CD commands */
143 __set_bit(GPCMD_PLAY_CD, filter->read_ok);
144 __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok);
145 __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok);
146 __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok);
147 __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok);
148
149 /* CD/DVD data reading */
150 __set_bit(GPCMD_READ_CD, filter->read_ok);
151 __set_bit(GPCMD_READ_CD_MSF, filter->read_ok);
152 __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok);
153 __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok);
154 __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok);
155 __set_bit(GPCMD_READ_HEADER, filter->read_ok);
156 __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok);
157 __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok);
158 __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok);
159 __set_bit(GPCMD_REPORT_KEY, filter->read_ok);
160 __set_bit(GPCMD_SCAN, filter->read_ok);
161 __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok);
162 __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok);
163 __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok);
164 __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok);
165 __set_bit(GPCMD_SEEK, filter->read_ok);
166 __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok);
167
168 /* Basic writing commands */
169 __set_bit(WRITE_6, filter->write_ok);
170 __set_bit(WRITE_10, filter->write_ok);
171 __set_bit(WRITE_VERIFY, filter->write_ok);
172 __set_bit(WRITE_12, filter->write_ok);
173 __set_bit(WRITE_VERIFY_12, filter->write_ok);
174 __set_bit(WRITE_16, filter->write_ok);
175 __set_bit(WRITE_LONG, filter->write_ok);
176 __set_bit(WRITE_LONG_2, filter->write_ok);
177 __set_bit(ERASE, filter->write_ok);
178 __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok);
179 __set_bit(MODE_SELECT, filter->write_ok);
180 __set_bit(LOG_SELECT, filter->write_ok);
181 __set_bit(GPCMD_BLANK, filter->write_ok);
182 __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok);
183 __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok);
184 __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok);
185 __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok);
186 __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok);
187 __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok);
188 __set_bit(GPCMD_SEND_EVENT, filter->write_ok);
189 __set_bit(GPCMD_SEND_KEY, filter->write_ok);
190 __set_bit(GPCMD_SEND_OPC, filter->write_ok);
191 __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok);
192 __set_bit(GPCMD_SET_SPEED, filter->write_ok);
193 __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok);
194 __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok);
195 __set_bit(GPCMD_SET_STREAMING, filter->write_ok);
196 __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok);
197}
198
199int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm)
200{
201 struct blk_cmd_filter *filter = &blk_default_cmd_filter;
202
203 /* root can do any command. */
204 if (capable(CAP_SYS_RAWIO))
205 return 0;
206
207 /* if there's no filter set, assume we're filtering everything out */
208 if (!filter)
209 return -EPERM;
210
211 /* Anybody who can open the device can do a read-safe command */
212 if (test_bit(cmd[0], filter->read_ok))
213 return 0;
214
215 /* Write-safe commands require a writable open */
216 if (test_bit(cmd[0], filter->write_ok) && has_write_perm)
217 return 0;
218
219 return -EPERM;
220}
221EXPORT_SYMBOL(blk_verify_command);
222
223static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq,
224 struct sg_io_hdr *hdr, fmode_t mode)
225{
226 if (copy_from_user(rq->cmd, hdr->cmdp, hdr->cmd_len))
227 return -EFAULT;
228 if (blk_verify_command(rq->cmd, mode & FMODE_WRITE))
229 return -EPERM;
230
231 /*
232 * fill in request structure
233 */
234 rq->cmd_len = hdr->cmd_len;
235 rq->cmd_type = REQ_TYPE_BLOCK_PC;
236
237 rq->timeout = msecs_to_jiffies(hdr->timeout);
238 if (!rq->timeout)
239 rq->timeout = q->sg_timeout;
240 if (!rq->timeout)
241 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
242 if (rq->timeout < BLK_MIN_SG_TIMEOUT)
243 rq->timeout = BLK_MIN_SG_TIMEOUT;
244
245 return 0;
246}
247
248static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
249 struct bio *bio)
250{
251 int r, ret = 0;
252
253 /*
254 * fill in all the output members
255 */
256 hdr->status = rq->errors & 0xff;
257 hdr->masked_status = status_byte(rq->errors);
258 hdr->msg_status = msg_byte(rq->errors);
259 hdr->host_status = host_byte(rq->errors);
260 hdr->driver_status = driver_byte(rq->errors);
261 hdr->info = 0;
262 if (hdr->masked_status || hdr->host_status || hdr->driver_status)
263 hdr->info |= SG_INFO_CHECK;
264 hdr->resid = rq->resid_len;
265 hdr->sb_len_wr = 0;
266
267 if (rq->sense_len && hdr->sbp) {
268 int len = min((unsigned int) hdr->mx_sb_len, rq->sense_len);
269
270 if (!copy_to_user(hdr->sbp, rq->sense, len))
271 hdr->sb_len_wr = len;
272 else
273 ret = -EFAULT;
274 }
275
276 r = blk_rq_unmap_user(bio);
277 if (!ret)
278 ret = r;
279 blk_put_request(rq);
280
281 return ret;
282}
283
284static int sg_io(struct request_queue *q, struct gendisk *bd_disk,
285 struct sg_io_hdr *hdr, fmode_t mode)
286{
287 unsigned long start_time;
288 int writing = 0, ret = 0;
289 struct request *rq;
290 char sense[SCSI_SENSE_BUFFERSIZE];
291 struct bio *bio;
292
293 if (hdr->interface_id != 'S')
294 return -EINVAL;
295 if (hdr->cmd_len > BLK_MAX_CDB)
296 return -EINVAL;
297
298 if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9))
299 return -EIO;
300
301 if (hdr->dxfer_len)
302 switch (hdr->dxfer_direction) {
303 default:
304 return -EINVAL;
305 case SG_DXFER_TO_DEV:
306 writing = 1;
307 break;
308 case SG_DXFER_TO_FROM_DEV:
309 case SG_DXFER_FROM_DEV:
310 break;
311 }
312
313 rq = blk_get_request(q, writing ? WRITE : READ, GFP_KERNEL);
314 if (!rq)
315 return -ENOMEM;
316
317 if (blk_fill_sghdr_rq(q, rq, hdr, mode)) {
318 blk_put_request(rq);
319 return -EFAULT;
320 }
321
322 if (hdr->iovec_count) {
323 const int size = sizeof(struct sg_iovec) * hdr->iovec_count;
324 size_t iov_data_len;
325 struct sg_iovec *sg_iov;
326 struct iovec *iov;
327 int i;
328
329 sg_iov = kmalloc(size, GFP_KERNEL);
330 if (!sg_iov) {
331 ret = -ENOMEM;
332 goto out;
333 }
334
335 if (copy_from_user(sg_iov, hdr->dxferp, size)) {
336 kfree(sg_iov);
337 ret = -EFAULT;
338 goto out;
339 }
340
341 /*
342 * Sum up the vecs, making sure they don't overflow
343 */
344 iov = (struct iovec *) sg_iov;
345 iov_data_len = 0;
346 for (i = 0; i < hdr->iovec_count; i++) {
347 if (iov_data_len + iov[i].iov_len < iov_data_len) {
348 kfree(sg_iov);
349 ret = -EINVAL;
350 goto out;
351 }
352 iov_data_len += iov[i].iov_len;
353 }
354
355 /* SG_IO howto says that the shorter of the two wins */
356 if (hdr->dxfer_len < iov_data_len) {
357 hdr->iovec_count = iov_shorten(iov,
358 hdr->iovec_count,
359 hdr->dxfer_len);
360 iov_data_len = hdr->dxfer_len;
361 }
362
363 ret = blk_rq_map_user_iov(q, rq, NULL, sg_iov, hdr->iovec_count,
364 iov_data_len, GFP_KERNEL);
365 kfree(sg_iov);
366 } else if (hdr->dxfer_len)
367 ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len,
368 GFP_KERNEL);
369
370 if (ret)
371 goto out;
372
373 bio = rq->bio;
374 memset(sense, 0, sizeof(sense));
375 rq->sense = sense;
376 rq->sense_len = 0;
377 rq->retries = 0;
378
379 start_time = jiffies;
380
381 /* ignore return value. All information is passed back to caller
382 * (if he doesn't check that is his problem).
383 * N.B. a non-zero SCSI status is _not_ necessarily an error.
384 */
385 blk_execute_rq(q, bd_disk, rq, 0);
386
387 hdr->duration = jiffies_to_msecs(jiffies - start_time);
388
389 return blk_complete_sghdr_rq(rq, hdr, bio);
390out:
391 blk_put_request(rq);
392 return ret;
393}
394
395/**
396 * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
397 * @file: file this ioctl operates on (optional)
398 * @q: request queue to send scsi commands down
399 * @disk: gendisk to operate on (option)
400 * @sic: userspace structure describing the command to perform
401 *
402 * Send down the scsi command described by @sic to the device below
403 * the request queue @q. If @file is non-NULL it's used to perform
404 * fine-grained permission checks that allow users to send down
405 * non-destructive SCSI commands. If the caller has a struct gendisk
406 * available it should be passed in as @disk to allow the low level
407 * driver to use the information contained in it. A non-NULL @disk
408 * is only allowed if the caller knows that the low level driver doesn't
409 * need it (e.g. in the scsi subsystem).
410 *
411 * Notes:
412 * - This interface is deprecated - users should use the SG_IO
413 * interface instead, as this is a more flexible approach to
414 * performing SCSI commands on a device.
415 * - The SCSI command length is determined by examining the 1st byte
416 * of the given command. There is no way to override this.
417 * - Data transfers are limited to PAGE_SIZE
418 * - The length (x + y) must be at least OMAX_SB_LEN bytes long to
419 * accommodate the sense buffer when an error occurs.
420 * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
421 * old code will not be surprised.
422 * - If a Unix error occurs (e.g. ENOMEM) then the user will receive
423 * a negative return and the Unix error code in 'errno'.
424 * If the SCSI command succeeds then 0 is returned.
425 * Positive numbers returned are the compacted SCSI error codes (4
426 * bytes in one int) where the lowest byte is the SCSI status.
427 */
428#define OMAX_SB_LEN 16 /* For backward compatibility */
429int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode,
430 struct scsi_ioctl_command __user *sic)
431{
432 struct request *rq;
433 int err;
434 unsigned int in_len, out_len, bytes, opcode, cmdlen;
435 char *buffer = NULL, sense[SCSI_SENSE_BUFFERSIZE];
436
437 if (!sic)
438 return -EINVAL;
439
440 /*
441 * get in an out lengths, verify they don't exceed a page worth of data
442 */
443 if (get_user(in_len, &sic->inlen))
444 return -EFAULT;
445 if (get_user(out_len, &sic->outlen))
446 return -EFAULT;
447 if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
448 return -EINVAL;
449 if (get_user(opcode, sic->data))
450 return -EFAULT;
451
452 bytes = max(in_len, out_len);
453 if (bytes) {
454 buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN);
455 if (!buffer)
456 return -ENOMEM;
457
458 }
459
460 rq = blk_get_request(q, in_len ? WRITE : READ, __GFP_WAIT);
461
462 cmdlen = COMMAND_SIZE(opcode);
463
464 /*
465 * get command and data to send to device, if any
466 */
467 err = -EFAULT;
468 rq->cmd_len = cmdlen;
469 if (copy_from_user(rq->cmd, sic->data, cmdlen))
470 goto error;
471
472 if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
473 goto error;
474
475 err = blk_verify_command(rq->cmd, mode & FMODE_WRITE);
476 if (err)
477 goto error;
478
479 /* default. possible overriden later */
480 rq->retries = 5;
481
482 switch (opcode) {
483 case SEND_DIAGNOSTIC:
484 case FORMAT_UNIT:
485 rq->timeout = FORMAT_UNIT_TIMEOUT;
486 rq->retries = 1;
487 break;
488 case START_STOP:
489 rq->timeout = START_STOP_TIMEOUT;
490 break;
491 case MOVE_MEDIUM:
492 rq->timeout = MOVE_MEDIUM_TIMEOUT;
493 break;
494 case READ_ELEMENT_STATUS:
495 rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
496 break;
497 case READ_DEFECT_DATA:
498 rq->timeout = READ_DEFECT_DATA_TIMEOUT;
499 rq->retries = 1;
500 break;
501 default:
502 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
503 break;
504 }
505
506 if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, __GFP_WAIT)) {
507 err = DRIVER_ERROR << 24;
508 goto out;
509 }
510
511 memset(sense, 0, sizeof(sense));
512 rq->sense = sense;
513 rq->sense_len = 0;
514 rq->cmd_type = REQ_TYPE_BLOCK_PC;
515
516 blk_execute_rq(q, disk, rq, 0);
517
518out:
519 err = rq->errors & 0xff; /* only 8 bit SCSI status */
520 if (err) {
521 if (rq->sense_len && rq->sense) {
522 bytes = (OMAX_SB_LEN > rq->sense_len) ?
523 rq->sense_len : OMAX_SB_LEN;
524 if (copy_to_user(sic->data, rq->sense, bytes))
525 err = -EFAULT;
526 }
527 } else {
528 if (copy_to_user(sic->data, buffer, out_len))
529 err = -EFAULT;
530 }
531
532error:
533 kfree(buffer);
534 blk_put_request(rq);
535 return err;
536}
537EXPORT_SYMBOL_GPL(sg_scsi_ioctl);
538
539/* Send basic block requests */
540static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk,
541 int cmd, int data)
542{
543 struct request *rq;
544 int err;
545
546 rq = blk_get_request(q, WRITE, __GFP_WAIT);
547 rq->cmd_type = REQ_TYPE_BLOCK_PC;
548 rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
549 rq->cmd[0] = cmd;
550 rq->cmd[4] = data;
551 rq->cmd_len = 6;
552 err = blk_execute_rq(q, bd_disk, rq, 0);
553 blk_put_request(rq);
554
555 return err;
556}
557
558static inline int blk_send_start_stop(struct request_queue *q,
559 struct gendisk *bd_disk, int data)
560{
561 return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data);
562}
563
564int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode,
565 unsigned int cmd, void __user *arg)
566{
567 int err;
568
569 if (!q)
570 return -ENXIO;
571
572 switch (cmd) {
573 /*
574 * new sgv3 interface
575 */
576 case SG_GET_VERSION_NUM:
577 err = sg_get_version(arg);
578 break;
579 case SCSI_IOCTL_GET_IDLUN:
580 err = scsi_get_idlun(q, arg);
581 break;
582 case SCSI_IOCTL_GET_BUS_NUMBER:
583 err = scsi_get_bus(q, arg);
584 break;
585 case SG_SET_TIMEOUT:
586 err = sg_set_timeout(q, arg);
587 break;
588 case SG_GET_TIMEOUT:
589 err = sg_get_timeout(q);
590 break;
591 case SG_GET_RESERVED_SIZE:
592 err = sg_get_reserved_size(q, arg);
593 break;
594 case SG_SET_RESERVED_SIZE:
595 err = sg_set_reserved_size(q, arg);
596 break;
597 case SG_EMULATED_HOST:
598 err = sg_emulated_host(q, arg);
599 break;
600 case SG_IO: {
601 struct sg_io_hdr hdr;
602
603 err = -EFAULT;
604 if (copy_from_user(&hdr, arg, sizeof(hdr)))
605 break;
606 err = sg_io(q, bd_disk, &hdr, mode);
607 if (err == -EFAULT)
608 break;
609
610 if (copy_to_user(arg, &hdr, sizeof(hdr)))
611 err = -EFAULT;
612 break;
613 }
614 case CDROM_SEND_PACKET: {
615 struct cdrom_generic_command cgc;
616 struct sg_io_hdr hdr;
617
618 err = -EFAULT;
619 if (copy_from_user(&cgc, arg, sizeof(cgc)))
620 break;
621 cgc.timeout = clock_t_to_jiffies(cgc.timeout);
622 memset(&hdr, 0, sizeof(hdr));
623 hdr.interface_id = 'S';
624 hdr.cmd_len = sizeof(cgc.cmd);
625 hdr.dxfer_len = cgc.buflen;
626 err = 0;
627 switch (cgc.data_direction) {
628 case CGC_DATA_UNKNOWN:
629 hdr.dxfer_direction = SG_DXFER_UNKNOWN;
630 break;
631 case CGC_DATA_WRITE:
632 hdr.dxfer_direction = SG_DXFER_TO_DEV;
633 break;
634 case CGC_DATA_READ:
635 hdr.dxfer_direction = SG_DXFER_FROM_DEV;
636 break;
637 case CGC_DATA_NONE:
638 hdr.dxfer_direction = SG_DXFER_NONE;
639 break;
640 default:
641 err = -EINVAL;
642 }
643 if (err)
644 break;
645
646 hdr.dxferp = cgc.buffer;
647 hdr.sbp = cgc.sense;
648 if (hdr.sbp)
649 hdr.mx_sb_len = sizeof(struct request_sense);
650 hdr.timeout = jiffies_to_msecs(cgc.timeout);
651 hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd;
652 hdr.cmd_len = sizeof(cgc.cmd);
653
654 err = sg_io(q, bd_disk, &hdr, mode);
655 if (err == -EFAULT)
656 break;
657
658 if (hdr.status)
659 err = -EIO;
660
661 cgc.stat = err;
662 cgc.buflen = hdr.resid;
663 if (copy_to_user(arg, &cgc, sizeof(cgc)))
664 err = -EFAULT;
665
666 break;
667 }
668
669 /*
670 * old junk scsi send command ioctl
671 */
672 case SCSI_IOCTL_SEND_COMMAND:
673 printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm);
674 err = -EINVAL;
675 if (!arg)
676 break;
677
678 err = sg_scsi_ioctl(q, bd_disk, mode, arg);
679 break;
680 case CDROMCLOSETRAY:
681 err = blk_send_start_stop(q, bd_disk, 0x03);
682 break;
683 case CDROMEJECT:
684 err = blk_send_start_stop(q, bd_disk, 0x02);
685 break;
686 default:
687 err = -ENOTTY;
688 }
689
690 return err;
691}
692EXPORT_SYMBOL(scsi_cmd_ioctl);
693
694int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd)
695{
696 if (bd && bd == bd->bd_contains)
697 return 0;
698
699 /* Actually none of these is particularly useful on a partition,
700 * but they are safe.
701 */
702 switch (cmd) {
703 case SCSI_IOCTL_GET_IDLUN:
704 case SCSI_IOCTL_GET_BUS_NUMBER:
705 case SCSI_IOCTL_GET_PCI:
706 case SCSI_IOCTL_PROBE_HOST:
707 case SG_GET_VERSION_NUM:
708 case SG_SET_TIMEOUT:
709 case SG_GET_TIMEOUT:
710 case SG_GET_RESERVED_SIZE:
711 case SG_SET_RESERVED_SIZE:
712 case SG_EMULATED_HOST:
713 return 0;
714 case CDROM_GET_CAPABILITY:
715 /* Keep this until we remove the printk below. udev sends it
716 * and we do not want to spam dmesg about it. CD-ROMs do
717 * not have partitions, so we get here only for disks.
718 */
719 return -ENOIOCTLCMD;
720 default:
721 break;
722 }
723
724 if (capable(CAP_SYS_RAWIO))
725 return 0;
726
727 /* In particular, rule out all resets and host-specific ioctls. */
728 printk_ratelimited(KERN_WARNING
729 "%s: sending ioctl %x to a partition!\n", current->comm, cmd);
730
731 return -ENOIOCTLCMD;
732}
733EXPORT_SYMBOL(scsi_verify_blk_ioctl);
734
735int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
736 unsigned int cmd, void __user *arg)
737{
738 int ret;
739
740 ret = scsi_verify_blk_ioctl(bd, cmd);
741 if (ret < 0)
742 return ret;
743
744 return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
745}
746EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
747
748static int __init blk_scsi_ioctl_init(void)
749{
750 blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
751 return 0;
752}
753fs_initcall(blk_scsi_ioctl_init);