Commit | Line | Data |
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8c16567d | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * Copyright (C) 2001 Jens Axboe <axboe@suse.de> | |
1da177e4 | 4 | */ |
98aaaec4 | 5 | #include <linux/compat.h> |
1da177e4 LT |
6 | #include <linux/kernel.h> |
7 | #include <linux/errno.h> | |
8 | #include <linux/string.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/blkdev.h> | |
c59ede7b | 11 | #include <linux/capability.h> |
1da177e4 LT |
12 | #include <linux/completion.h> |
13 | #include <linux/cdrom.h> | |
0bfc96cb | 14 | #include <linux/ratelimit.h> |
1da177e4 LT |
15 | #include <linux/slab.h> |
16 | #include <linux/times.h> | |
a27bb332 | 17 | #include <linux/uio.h> |
7c0f6ba6 | 18 | #include <linux/uaccess.h> |
1da177e4 LT |
19 | |
20 | #include <scsi/scsi.h> | |
21 | #include <scsi/scsi_ioctl.h> | |
22 | #include <scsi/scsi_cmnd.h> | |
78ed001d | 23 | #include <scsi/sg.h> |
1da177e4 | 24 | |
018e0446 JA |
25 | struct blk_cmd_filter { |
26 | unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; | |
27 | unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; | |
476d42f1 HS |
28 | }; |
29 | ||
30 | static struct blk_cmd_filter blk_default_cmd_filter; | |
018e0446 | 31 | |
1da177e4 | 32 | /* Command group 3 is reserved and should never be used. */ |
db4742dd | 33 | const unsigned char scsi_command_size_tbl[8] = |
1da177e4 LT |
34 | { |
35 | 6, 10, 10, 12, | |
36 | 16, 12, 10, 10 | |
37 | }; | |
db4742dd | 38 | EXPORT_SYMBOL(scsi_command_size_tbl); |
1da177e4 | 39 | |
1da177e4 LT |
40 | #include <scsi/sg.h> |
41 | ||
42 | static int sg_get_version(int __user *p) | |
43 | { | |
64100099 | 44 | static const int sg_version_num = 30527; |
1da177e4 LT |
45 | return put_user(sg_version_num, p); |
46 | } | |
47 | ||
165125e1 | 48 | static int scsi_get_idlun(struct request_queue *q, int __user *p) |
1da177e4 LT |
49 | { |
50 | return put_user(0, p); | |
51 | } | |
52 | ||
165125e1 | 53 | static int scsi_get_bus(struct request_queue *q, int __user *p) |
1da177e4 LT |
54 | { |
55 | return put_user(0, p); | |
56 | } | |
57 | ||
165125e1 | 58 | static int sg_get_timeout(struct request_queue *q) |
1da177e4 | 59 | { |
2b91bafc | 60 | return jiffies_to_clock_t(q->sg_timeout); |
1da177e4 LT |
61 | } |
62 | ||
165125e1 | 63 | static int sg_set_timeout(struct request_queue *q, int __user *p) |
1da177e4 LT |
64 | { |
65 | int timeout, err = get_user(timeout, p); | |
66 | ||
67 | if (!err) | |
2b91bafc | 68 | q->sg_timeout = clock_t_to_jiffies(timeout); |
1da177e4 LT |
69 | |
70 | return err; | |
71 | } | |
72 | ||
9b4231bf AM |
73 | static int max_sectors_bytes(struct request_queue *q) |
74 | { | |
75 | unsigned int max_sectors = queue_max_sectors(q); | |
76 | ||
77 | max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9); | |
78 | ||
79 | return max_sectors << 9; | |
80 | } | |
81 | ||
165125e1 | 82 | static int sg_get_reserved_size(struct request_queue *q, int __user *p) |
1da177e4 | 83 | { |
9b4231bf | 84 | int val = min_t(int, q->sg_reserved_size, max_sectors_bytes(q)); |
44ec9542 AS |
85 | |
86 | return put_user(val, p); | |
1da177e4 LT |
87 | } |
88 | ||
165125e1 | 89 | static int sg_set_reserved_size(struct request_queue *q, int __user *p) |
1da177e4 LT |
90 | { |
91 | int size, err = get_user(size, p); | |
92 | ||
93 | if (err) | |
94 | return err; | |
95 | ||
96 | if (size < 0) | |
97 | return -EINVAL; | |
1da177e4 | 98 | |
9b4231bf | 99 | q->sg_reserved_size = min(size, max_sectors_bytes(q)); |
1da177e4 LT |
100 | return 0; |
101 | } | |
102 | ||
103 | /* | |
104 | * will always return that we are ATAPI even for a real SCSI drive, I'm not | |
105 | * so sure this is worth doing anything about (why would you care??) | |
106 | */ | |
165125e1 | 107 | static int sg_emulated_host(struct request_queue *q, int __user *p) |
1da177e4 LT |
108 | { |
109 | return put_user(1, p); | |
110 | } | |
111 | ||
018e0446 | 112 | static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter) |
abf54393 FT |
113 | { |
114 | /* Basic read-only commands */ | |
115 | __set_bit(TEST_UNIT_READY, filter->read_ok); | |
116 | __set_bit(REQUEST_SENSE, filter->read_ok); | |
117 | __set_bit(READ_6, filter->read_ok); | |
118 | __set_bit(READ_10, filter->read_ok); | |
119 | __set_bit(READ_12, filter->read_ok); | |
120 | __set_bit(READ_16, filter->read_ok); | |
121 | __set_bit(READ_BUFFER, filter->read_ok); | |
122 | __set_bit(READ_DEFECT_DATA, filter->read_ok); | |
123 | __set_bit(READ_CAPACITY, filter->read_ok); | |
124 | __set_bit(READ_LONG, filter->read_ok); | |
125 | __set_bit(INQUIRY, filter->read_ok); | |
126 | __set_bit(MODE_SENSE, filter->read_ok); | |
127 | __set_bit(MODE_SENSE_10, filter->read_ok); | |
128 | __set_bit(LOG_SENSE, filter->read_ok); | |
129 | __set_bit(START_STOP, filter->read_ok); | |
130 | __set_bit(GPCMD_VERIFY_10, filter->read_ok); | |
131 | __set_bit(VERIFY_16, filter->read_ok); | |
132 | __set_bit(REPORT_LUNS, filter->read_ok); | |
eb846d9f | 133 | __set_bit(SERVICE_ACTION_IN_16, filter->read_ok); |
abf54393 FT |
134 | __set_bit(RECEIVE_DIAGNOSTIC, filter->read_ok); |
135 | __set_bit(MAINTENANCE_IN, filter->read_ok); | |
136 | __set_bit(GPCMD_READ_BUFFER_CAPACITY, filter->read_ok); | |
137 | ||
138 | /* Audio CD commands */ | |
139 | __set_bit(GPCMD_PLAY_CD, filter->read_ok); | |
140 | __set_bit(GPCMD_PLAY_AUDIO_10, filter->read_ok); | |
141 | __set_bit(GPCMD_PLAY_AUDIO_MSF, filter->read_ok); | |
142 | __set_bit(GPCMD_PLAY_AUDIO_TI, filter->read_ok); | |
143 | __set_bit(GPCMD_PAUSE_RESUME, filter->read_ok); | |
144 | ||
145 | /* CD/DVD data reading */ | |
146 | __set_bit(GPCMD_READ_CD, filter->read_ok); | |
147 | __set_bit(GPCMD_READ_CD_MSF, filter->read_ok); | |
148 | __set_bit(GPCMD_READ_DISC_INFO, filter->read_ok); | |
149 | __set_bit(GPCMD_READ_CDVD_CAPACITY, filter->read_ok); | |
150 | __set_bit(GPCMD_READ_DVD_STRUCTURE, filter->read_ok); | |
151 | __set_bit(GPCMD_READ_HEADER, filter->read_ok); | |
152 | __set_bit(GPCMD_READ_TRACK_RZONE_INFO, filter->read_ok); | |
153 | __set_bit(GPCMD_READ_SUBCHANNEL, filter->read_ok); | |
154 | __set_bit(GPCMD_READ_TOC_PMA_ATIP, filter->read_ok); | |
155 | __set_bit(GPCMD_REPORT_KEY, filter->read_ok); | |
156 | __set_bit(GPCMD_SCAN, filter->read_ok); | |
157 | __set_bit(GPCMD_GET_CONFIGURATION, filter->read_ok); | |
158 | __set_bit(GPCMD_READ_FORMAT_CAPACITIES, filter->read_ok); | |
159 | __set_bit(GPCMD_GET_EVENT_STATUS_NOTIFICATION, filter->read_ok); | |
160 | __set_bit(GPCMD_GET_PERFORMANCE, filter->read_ok); | |
161 | __set_bit(GPCMD_SEEK, filter->read_ok); | |
162 | __set_bit(GPCMD_STOP_PLAY_SCAN, filter->read_ok); | |
163 | ||
164 | /* Basic writing commands */ | |
165 | __set_bit(WRITE_6, filter->write_ok); | |
166 | __set_bit(WRITE_10, filter->write_ok); | |
167 | __set_bit(WRITE_VERIFY, filter->write_ok); | |
168 | __set_bit(WRITE_12, filter->write_ok); | |
169 | __set_bit(WRITE_VERIFY_12, filter->write_ok); | |
170 | __set_bit(WRITE_16, filter->write_ok); | |
171 | __set_bit(WRITE_LONG, filter->write_ok); | |
172 | __set_bit(WRITE_LONG_2, filter->write_ok); | |
25cdb645 MFO |
173 | __set_bit(WRITE_SAME, filter->write_ok); |
174 | __set_bit(WRITE_SAME_16, filter->write_ok); | |
175 | __set_bit(WRITE_SAME_32, filter->write_ok); | |
abf54393 FT |
176 | __set_bit(ERASE, filter->write_ok); |
177 | __set_bit(GPCMD_MODE_SELECT_10, filter->write_ok); | |
178 | __set_bit(MODE_SELECT, filter->write_ok); | |
179 | __set_bit(LOG_SELECT, filter->write_ok); | |
180 | __set_bit(GPCMD_BLANK, filter->write_ok); | |
181 | __set_bit(GPCMD_CLOSE_TRACK, filter->write_ok); | |
182 | __set_bit(GPCMD_FLUSH_CACHE, filter->write_ok); | |
183 | __set_bit(GPCMD_FORMAT_UNIT, filter->write_ok); | |
184 | __set_bit(GPCMD_REPAIR_RZONE_TRACK, filter->write_ok); | |
185 | __set_bit(GPCMD_RESERVE_RZONE_TRACK, filter->write_ok); | |
186 | __set_bit(GPCMD_SEND_DVD_STRUCTURE, filter->write_ok); | |
187 | __set_bit(GPCMD_SEND_EVENT, filter->write_ok); | |
188 | __set_bit(GPCMD_SEND_KEY, filter->write_ok); | |
189 | __set_bit(GPCMD_SEND_OPC, filter->write_ok); | |
190 | __set_bit(GPCMD_SEND_CUE_SHEET, filter->write_ok); | |
191 | __set_bit(GPCMD_SET_SPEED, filter->write_ok); | |
192 | __set_bit(GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL, filter->write_ok); | |
193 | __set_bit(GPCMD_LOAD_UNLOAD, filter->write_ok); | |
194 | __set_bit(GPCMD_SET_STREAMING, filter->write_ok); | |
35e396cd | 195 | __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok); |
abf54393 | 196 | } |
018e0446 | 197 | |
f00c4d80 | 198 | int blk_verify_command(unsigned char *cmd, fmode_t mode) |
018e0446 JA |
199 | { |
200 | struct blk_cmd_filter *filter = &blk_default_cmd_filter; | |
201 | ||
202 | /* root can do any command. */ | |
203 | if (capable(CAP_SYS_RAWIO)) | |
204 | return 0; | |
205 | ||
018e0446 JA |
206 | /* Anybody who can open the device can do a read-safe command */ |
207 | if (test_bit(cmd[0], filter->read_ok)) | |
208 | return 0; | |
209 | ||
210 | /* Write-safe commands require a writable open */ | |
f00c4d80 | 211 | if (test_bit(cmd[0], filter->write_ok) && (mode & FMODE_WRITE)) |
018e0446 JA |
212 | return 0; |
213 | ||
214 | return -EPERM; | |
215 | } | |
216 | EXPORT_SYMBOL(blk_verify_command); | |
abf54393 | 217 | |
165125e1 | 218 | static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq, |
5842e51f | 219 | struct sg_io_hdr *hdr, fmode_t mode) |
3d6392cf | 220 | { |
82ed4db4 CH |
221 | struct scsi_request *req = scsi_req(rq); |
222 | ||
223 | if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len)) | |
3d6392cf | 224 | return -EFAULT; |
f00c4d80 | 225 | if (blk_verify_command(req->cmd, mode)) |
3d6392cf JA |
226 | return -EPERM; |
227 | ||
228 | /* | |
229 | * fill in request structure | |
230 | */ | |
82ed4db4 | 231 | req->cmd_len = hdr->cmd_len; |
3d6392cf | 232 | |
24bb8fb9 | 233 | rq->timeout = msecs_to_jiffies(hdr->timeout); |
3d6392cf JA |
234 | if (!rq->timeout) |
235 | rq->timeout = q->sg_timeout; | |
236 | if (!rq->timeout) | |
237 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; | |
f2f1fa78 LT |
238 | if (rq->timeout < BLK_MIN_SG_TIMEOUT) |
239 | rq->timeout = BLK_MIN_SG_TIMEOUT; | |
3d6392cf JA |
240 | |
241 | return 0; | |
242 | } | |
3d6392cf | 243 | |
41e1703b FT |
244 | static int blk_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr, |
245 | struct bio *bio) | |
3d6392cf | 246 | { |
82ed4db4 | 247 | struct scsi_request *req = scsi_req(rq); |
91e463c8 | 248 | int r, ret = 0; |
3d6392cf JA |
249 | |
250 | /* | |
251 | * fill in all the output members | |
252 | */ | |
17d5363b CH |
253 | hdr->status = req->result & 0xff; |
254 | hdr->masked_status = status_byte(req->result); | |
255 | hdr->msg_status = msg_byte(req->result); | |
256 | hdr->host_status = host_byte(req->result); | |
257 | hdr->driver_status = driver_byte(req->result); | |
3d6392cf JA |
258 | hdr->info = 0; |
259 | if (hdr->masked_status || hdr->host_status || hdr->driver_status) | |
260 | hdr->info |= SG_INFO_CHECK; | |
82ed4db4 | 261 | hdr->resid = req->resid_len; |
3d6392cf JA |
262 | hdr->sb_len_wr = 0; |
263 | ||
82ed4db4 CH |
264 | if (req->sense_len && hdr->sbp) { |
265 | int len = min((unsigned int) hdr->mx_sb_len, req->sense_len); | |
3d6392cf | 266 | |
82ed4db4 | 267 | if (!copy_to_user(hdr->sbp, req->sense, len)) |
3d6392cf JA |
268 | hdr->sb_len_wr = len; |
269 | else | |
270 | ret = -EFAULT; | |
271 | } | |
272 | ||
91e463c8 FT |
273 | r = blk_rq_unmap_user(bio); |
274 | if (!ret) | |
275 | ret = r; | |
3d6392cf | 276 | |
1cd96c24 | 277 | return ret; |
3d6392cf | 278 | } |
3d6392cf | 279 | |
5842e51f AV |
280 | static int sg_io(struct request_queue *q, struct gendisk *bd_disk, |
281 | struct sg_io_hdr *hdr, fmode_t mode) | |
1da177e4 | 282 | { |
3d6392cf | 283 | unsigned long start_time; |
e0ce0eac KO |
284 | ssize_t ret = 0; |
285 | int writing = 0; | |
d1515613 | 286 | int at_head = 0; |
1da177e4 | 287 | struct request *rq; |
82ed4db4 | 288 | struct scsi_request *req; |
77d172ce | 289 | struct bio *bio; |
1da177e4 LT |
290 | |
291 | if (hdr->interface_id != 'S') | |
292 | return -EINVAL; | |
1da177e4 | 293 | |
ae03bf63 | 294 | if (hdr->dxfer_len > (queue_max_hw_sectors(q) << 9)) |
1da177e4 LT |
295 | return -EIO; |
296 | ||
f1970baf | 297 | if (hdr->dxfer_len) |
1da177e4 LT |
298 | switch (hdr->dxfer_direction) { |
299 | default: | |
300 | return -EINVAL; | |
1da177e4 LT |
301 | case SG_DXFER_TO_DEV: |
302 | writing = 1; | |
303 | break; | |
616e8a09 | 304 | case SG_DXFER_TO_FROM_DEV: |
1da177e4 | 305 | case SG_DXFER_FROM_DEV: |
1da177e4 LT |
306 | break; |
307 | } | |
d1515613 DG |
308 | if (hdr->flags & SG_FLAG_Q_AT_HEAD) |
309 | at_head = 1; | |
1da177e4 | 310 | |
a57821ca | 311 | ret = -ENOMEM; |
ff005a06 | 312 | rq = blk_get_request(q, writing ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0); |
a492f075 JL |
313 | if (IS_ERR(rq)) |
314 | return PTR_ERR(rq); | |
82ed4db4 | 315 | req = scsi_req(rq); |
1da177e4 | 316 | |
a57821ca | 317 | if (hdr->cmd_len > BLK_MAX_CDB) { |
82ed4db4 CH |
318 | req->cmd = kzalloc(hdr->cmd_len, GFP_KERNEL); |
319 | if (!req->cmd) | |
a57821ca | 320 | goto out_put_request; |
3d6392cf | 321 | } |
1da177e4 | 322 | |
2c4cffe8 PB |
323 | ret = blk_fill_sghdr_rq(q, rq, hdr, mode); |
324 | if (ret < 0) | |
a57821ca | 325 | goto out_free_cdb; |
1da177e4 | 326 | |
d19d7446 | 327 | ret = 0; |
0e75f906 | 328 | if (hdr->iovec_count) { |
26e49cfc | 329 | struct iov_iter i; |
17a05cca | 330 | struct iovec *iov = NULL; |
0e75f906 | 331 | |
98aaaec4 AB |
332 | #ifdef CONFIG_COMPAT |
333 | if (in_compat_syscall()) | |
334 | ret = compat_import_iovec(rq_data_dir(rq), | |
335 | hdr->dxferp, hdr->iovec_count, | |
336 | 0, &iov, &i); | |
337 | else | |
338 | #endif | |
339 | ret = import_iovec(rq_data_dir(rq), | |
e272b89f AV |
340 | hdr->dxferp, hdr->iovec_count, |
341 | 0, &iov, &i); | |
342 | if (ret < 0) | |
a57821ca | 343 | goto out_free_cdb; |
0e75f906 | 344 | |
25636e28 | 345 | /* SG_IO howto says that the shorter of the two wins */ |
e272b89f | 346 | iov_iter_truncate(&i, hdr->dxfer_len); |
25636e28 | 347 | |
26e49cfc | 348 | ret = blk_rq_map_user_iov(q, rq, NULL, &i, GFP_KERNEL); |
e0ce0eac | 349 | kfree(iov); |
0e75f906 | 350 | } else if (hdr->dxfer_len) |
152e283f | 351 | ret = blk_rq_map_user(q, rq, NULL, hdr->dxferp, hdr->dxfer_len, |
a3bce90e | 352 | GFP_KERNEL); |
0e75f906 MC |
353 | |
354 | if (ret) | |
a57821ca | 355 | goto out_free_cdb; |
0e75f906 | 356 | |
77d172ce | 357 | bio = rq->bio; |
64c7f1d1 | 358 | req->retries = 0; |
01840f9c | 359 | |
1da177e4 LT |
360 | start_time = jiffies; |
361 | ||
362 | /* ignore return value. All information is passed back to caller | |
363 | * (if he doesn't check that is his problem). | |
364 | * N.B. a non-zero SCSI status is _not_ necessarily an error. | |
365 | */ | |
d1515613 | 366 | blk_execute_rq(q, bd_disk, rq, at_head); |
1da177e4 | 367 | |
24bb8fb9 | 368 | hdr->duration = jiffies_to_msecs(jiffies - start_time); |
1da177e4 | 369 | |
2cada584 | 370 | ret = blk_complete_sghdr_rq(rq, hdr, bio); |
a57821ca CH |
371 | |
372 | out_free_cdb: | |
82ed4db4 | 373 | scsi_req_free_cmd(req); |
a57821ca | 374 | out_put_request: |
dd1cab95 JA |
375 | blk_put_request(rq); |
376 | return ret; | |
1da177e4 LT |
377 | } |
378 | ||
21b2f0c8 CH |
379 | /** |
380 | * sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl | |
21b2f0c8 CH |
381 | * @q: request queue to send scsi commands down |
382 | * @disk: gendisk to operate on (option) | |
aa98192d BVA |
383 | * @mode: mode used to open the file through which the ioctl has been |
384 | * submitted | |
21b2f0c8 CH |
385 | * @sic: userspace structure describing the command to perform |
386 | * | |
387 | * Send down the scsi command described by @sic to the device below | |
388 | * the request queue @q. If @file is non-NULL it's used to perform | |
389 | * fine-grained permission checks that allow users to send down | |
390 | * non-destructive SCSI commands. If the caller has a struct gendisk | |
391 | * available it should be passed in as @disk to allow the low level | |
392 | * driver to use the information contained in it. A non-NULL @disk | |
393 | * is only allowed if the caller knows that the low level driver doesn't | |
394 | * need it (e.g. in the scsi subsystem). | |
395 | * | |
396 | * Notes: | |
397 | * - This interface is deprecated - users should use the SG_IO | |
398 | * interface instead, as this is a more flexible approach to | |
399 | * performing SCSI commands on a device. | |
400 | * - The SCSI command length is determined by examining the 1st byte | |
401 | * of the given command. There is no way to override this. | |
402 | * - Data transfers are limited to PAGE_SIZE | |
403 | * - The length (x + y) must be at least OMAX_SB_LEN bytes long to | |
404 | * accommodate the sense buffer when an error occurs. | |
405 | * The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that | |
406 | * old code will not be surprised. | |
407 | * - If a Unix error occurs (e.g. ENOMEM) then the user will receive | |
408 | * a negative return and the Unix error code in 'errno'. | |
409 | * If the SCSI command succeeds then 0 is returned. | |
410 | * Positive numbers returned are the compacted SCSI error codes (4 | |
411 | * bytes in one int) where the lowest byte is the SCSI status. | |
412 | */ | |
e915e872 AV |
413 | int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, |
414 | struct scsi_ioctl_command __user *sic) | |
1da177e4 | 415 | { |
aa98192d | 416 | enum { OMAX_SB_LEN = 16 }; /* For backward compatibility */ |
1da177e4 | 417 | struct request *rq; |
82ed4db4 | 418 | struct scsi_request *req; |
aeb5d727 | 419 | int err; |
1da177e4 | 420 | unsigned int in_len, out_len, bytes, opcode, cmdlen; |
82ed4db4 | 421 | char *buffer = NULL; |
1da177e4 | 422 | |
21b2f0c8 CH |
423 | if (!sic) |
424 | return -EINVAL; | |
425 | ||
1da177e4 LT |
426 | /* |
427 | * get in an out lengths, verify they don't exceed a page worth of data | |
428 | */ | |
429 | if (get_user(in_len, &sic->inlen)) | |
430 | return -EFAULT; | |
431 | if (get_user(out_len, &sic->outlen)) | |
432 | return -EFAULT; | |
433 | if (in_len > PAGE_SIZE || out_len > PAGE_SIZE) | |
434 | return -EINVAL; | |
435 | if (get_user(opcode, sic->data)) | |
436 | return -EFAULT; | |
437 | ||
438 | bytes = max(in_len, out_len); | |
439 | if (bytes) { | |
dd00cc48 | 440 | buffer = kzalloc(bytes, q->bounce_gfp | GFP_USER| __GFP_NOWARN); |
1da177e4 LT |
441 | if (!buffer) |
442 | return -ENOMEM; | |
443 | ||
1da177e4 LT |
444 | } |
445 | ||
ff005a06 | 446 | rq = blk_get_request(q, in_len ? REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0); |
a492f075 JL |
447 | if (IS_ERR(rq)) { |
448 | err = PTR_ERR(rq); | |
92697dc9 | 449 | goto error_free_buffer; |
eb571eea | 450 | } |
82ed4db4 | 451 | req = scsi_req(rq); |
1da177e4 LT |
452 | |
453 | cmdlen = COMMAND_SIZE(opcode); | |
454 | ||
455 | /* | |
456 | * get command and data to send to device, if any | |
457 | */ | |
458 | err = -EFAULT; | |
82ed4db4 CH |
459 | req->cmd_len = cmdlen; |
460 | if (copy_from_user(req->cmd, sic->data, cmdlen)) | |
1da177e4 LT |
461 | goto error; |
462 | ||
21b2f0c8 | 463 | if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len)) |
1da177e4 LT |
464 | goto error; |
465 | ||
f00c4d80 | 466 | err = blk_verify_command(req->cmd, mode); |
1da177e4 LT |
467 | if (err) |
468 | goto error; | |
469 | ||
21b2f0c8 | 470 | /* default. possible overriden later */ |
64c7f1d1 | 471 | req->retries = 5; |
21b2f0c8 | 472 | |
1da177e4 | 473 | switch (opcode) { |
21b2f0c8 CH |
474 | case SEND_DIAGNOSTIC: |
475 | case FORMAT_UNIT: | |
476 | rq->timeout = FORMAT_UNIT_TIMEOUT; | |
64c7f1d1 | 477 | req->retries = 1; |
21b2f0c8 CH |
478 | break; |
479 | case START_STOP: | |
480 | rq->timeout = START_STOP_TIMEOUT; | |
481 | break; | |
482 | case MOVE_MEDIUM: | |
483 | rq->timeout = MOVE_MEDIUM_TIMEOUT; | |
484 | break; | |
485 | case READ_ELEMENT_STATUS: | |
486 | rq->timeout = READ_ELEMENT_STATUS_TIMEOUT; | |
487 | break; | |
488 | case READ_DEFECT_DATA: | |
489 | rq->timeout = READ_DEFECT_DATA_TIMEOUT; | |
64c7f1d1 | 490 | req->retries = 1; |
21b2f0c8 CH |
491 | break; |
492 | default: | |
3d6392cf | 493 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
21b2f0c8 CH |
494 | break; |
495 | } | |
496 | ||
0eb0b63c | 497 | if (bytes && blk_rq_map_kern(q, rq, buffer, bytes, GFP_NOIO)) { |
21b2f0c8 | 498 | err = DRIVER_ERROR << 24; |
84ce0f0e | 499 | goto error; |
1da177e4 LT |
500 | } |
501 | ||
21b2f0c8 CH |
502 | blk_execute_rq(q, disk, rq, 0); |
503 | ||
17d5363b | 504 | err = req->result & 0xff; /* only 8 bit SCSI status */ |
1da177e4 | 505 | if (err) { |
82ed4db4 CH |
506 | if (req->sense_len && req->sense) { |
507 | bytes = (OMAX_SB_LEN > req->sense_len) ? | |
508 | req->sense_len : OMAX_SB_LEN; | |
509 | if (copy_to_user(sic->data, req->sense, bytes)) | |
1da177e4 LT |
510 | err = -EFAULT; |
511 | } | |
512 | } else { | |
513 | if (copy_to_user(sic->data, buffer, out_len)) | |
514 | err = -EFAULT; | |
515 | } | |
516 | ||
517 | error: | |
92697dc9 TB |
518 | blk_put_request(rq); |
519 | ||
520 | error_free_buffer: | |
eb571eea | 521 | kfree(buffer); |
92697dc9 | 522 | |
1da177e4 LT |
523 | return err; |
524 | } | |
21b2f0c8 | 525 | EXPORT_SYMBOL_GPL(sg_scsi_ioctl); |
f98d2dfd BC |
526 | |
527 | /* Send basic block requests */ | |
165125e1 JA |
528 | static int __blk_send_generic(struct request_queue *q, struct gendisk *bd_disk, |
529 | int cmd, int data) | |
f98d2dfd BC |
530 | { |
531 | struct request *rq; | |
532 | int err; | |
533 | ||
ff005a06 | 534 | rq = blk_get_request(q, REQ_OP_SCSI_OUT, 0); |
a492f075 JL |
535 | if (IS_ERR(rq)) |
536 | return PTR_ERR(rq); | |
3d6392cf | 537 | rq->timeout = BLK_DEFAULT_SG_TIMEOUT; |
82ed4db4 CH |
538 | scsi_req(rq)->cmd[0] = cmd; |
539 | scsi_req(rq)->cmd[4] = data; | |
540 | scsi_req(rq)->cmd_len = 6; | |
b7819b92 | 541 | blk_execute_rq(q, bd_disk, rq, 0); |
17d5363b | 542 | err = scsi_req(rq)->result ? -EIO : 0; |
f98d2dfd BC |
543 | blk_put_request(rq); |
544 | ||
545 | return err; | |
546 | } | |
547 | ||
165125e1 JA |
548 | static inline int blk_send_start_stop(struct request_queue *q, |
549 | struct gendisk *bd_disk, int data) | |
f98d2dfd BC |
550 | { |
551 | return __blk_send_generic(q, bd_disk, GPCMD_START_STOP_UNIT, data); | |
552 | } | |
553 | ||
98aaaec4 AB |
554 | int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp) |
555 | { | |
556 | #ifdef CONFIG_COMPAT | |
557 | if (in_compat_syscall()) { | |
558 | struct compat_sg_io_hdr hdr32 = { | |
559 | .interface_id = hdr->interface_id, | |
560 | .dxfer_direction = hdr->dxfer_direction, | |
561 | .cmd_len = hdr->cmd_len, | |
562 | .mx_sb_len = hdr->mx_sb_len, | |
563 | .iovec_count = hdr->iovec_count, | |
564 | .dxfer_len = hdr->dxfer_len, | |
565 | .dxferp = (uintptr_t)hdr->dxferp, | |
566 | .cmdp = (uintptr_t)hdr->cmdp, | |
567 | .sbp = (uintptr_t)hdr->sbp, | |
568 | .timeout = hdr->timeout, | |
569 | .flags = hdr->flags, | |
570 | .pack_id = hdr->pack_id, | |
571 | .usr_ptr = (uintptr_t)hdr->usr_ptr, | |
572 | .status = hdr->status, | |
573 | .masked_status = hdr->masked_status, | |
574 | .msg_status = hdr->msg_status, | |
575 | .sb_len_wr = hdr->sb_len_wr, | |
576 | .host_status = hdr->host_status, | |
577 | .driver_status = hdr->driver_status, | |
578 | .resid = hdr->resid, | |
579 | .duration = hdr->duration, | |
580 | .info = hdr->info, | |
581 | }; | |
582 | ||
583 | if (copy_to_user(argp, &hdr32, sizeof(hdr32))) | |
584 | return -EFAULT; | |
585 | ||
586 | return 0; | |
587 | } | |
588 | #endif | |
589 | ||
590 | if (copy_to_user(argp, hdr, sizeof(*hdr))) | |
591 | return -EFAULT; | |
592 | ||
593 | return 0; | |
594 | } | |
595 | EXPORT_SYMBOL(put_sg_io_hdr); | |
596 | ||
597 | int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp) | |
598 | { | |
599 | #ifdef CONFIG_COMPAT | |
600 | struct compat_sg_io_hdr hdr32; | |
601 | ||
602 | if (in_compat_syscall()) { | |
603 | if (copy_from_user(&hdr32, argp, sizeof(hdr32))) | |
604 | return -EFAULT; | |
605 | ||
606 | *hdr = (struct sg_io_hdr) { | |
607 | .interface_id = hdr32.interface_id, | |
608 | .dxfer_direction = hdr32.dxfer_direction, | |
609 | .cmd_len = hdr32.cmd_len, | |
610 | .mx_sb_len = hdr32.mx_sb_len, | |
611 | .iovec_count = hdr32.iovec_count, | |
612 | .dxfer_len = hdr32.dxfer_len, | |
613 | .dxferp = compat_ptr(hdr32.dxferp), | |
614 | .cmdp = compat_ptr(hdr32.cmdp), | |
615 | .sbp = compat_ptr(hdr32.sbp), | |
616 | .timeout = hdr32.timeout, | |
617 | .flags = hdr32.flags, | |
618 | .pack_id = hdr32.pack_id, | |
619 | .usr_ptr = compat_ptr(hdr32.usr_ptr), | |
620 | .status = hdr32.status, | |
621 | .masked_status = hdr32.masked_status, | |
622 | .msg_status = hdr32.msg_status, | |
623 | .sb_len_wr = hdr32.sb_len_wr, | |
624 | .host_status = hdr32.host_status, | |
625 | .driver_status = hdr32.driver_status, | |
626 | .resid = hdr32.resid, | |
627 | .duration = hdr32.duration, | |
628 | .info = hdr32.info, | |
629 | }; | |
630 | ||
631 | return 0; | |
632 | } | |
633 | #endif | |
634 | ||
635 | if (copy_from_user(hdr, argp, sizeof(*hdr))) | |
636 | return -EFAULT; | |
637 | ||
638 | return 0; | |
639 | } | |
640 | EXPORT_SYMBOL(get_sg_io_hdr); | |
641 | ||
f3ee6e63 AB |
642 | #ifdef CONFIG_COMPAT |
643 | struct compat_cdrom_generic_command { | |
644 | unsigned char cmd[CDROM_PACKET_SIZE]; | |
645 | compat_caddr_t buffer; | |
646 | compat_uint_t buflen; | |
647 | compat_int_t stat; | |
648 | compat_caddr_t sense; | |
649 | unsigned char data_direction; | |
650 | compat_int_t quiet; | |
651 | compat_int_t timeout; | |
652 | compat_caddr_t reserved[1]; | |
653 | }; | |
654 | #endif | |
655 | ||
656 | static int scsi_get_cdrom_generic_arg(struct cdrom_generic_command *cgc, | |
657 | const void __user *arg) | |
658 | { | |
659 | #ifdef CONFIG_COMPAT | |
660 | if (in_compat_syscall()) { | |
661 | struct compat_cdrom_generic_command cgc32; | |
662 | ||
663 | if (copy_from_user(&cgc32, arg, sizeof(cgc32))) | |
664 | return -EFAULT; | |
665 | ||
666 | *cgc = (struct cdrom_generic_command) { | |
667 | .buffer = compat_ptr(cgc32.buffer), | |
668 | .buflen = cgc32.buflen, | |
669 | .stat = cgc32.stat, | |
670 | .sense = compat_ptr(cgc32.sense), | |
671 | .data_direction = cgc32.data_direction, | |
672 | .quiet = cgc32.quiet, | |
673 | .timeout = cgc32.timeout, | |
674 | .reserved[0] = compat_ptr(cgc32.reserved[0]), | |
675 | }; | |
676 | memcpy(&cgc->cmd, &cgc32.cmd, CDROM_PACKET_SIZE); | |
677 | return 0; | |
678 | } | |
679 | #endif | |
680 | if (copy_from_user(cgc, arg, sizeof(*cgc))) | |
681 | return -EFAULT; | |
682 | ||
683 | return 0; | |
684 | } | |
685 | ||
686 | static int scsi_put_cdrom_generic_arg(const struct cdrom_generic_command *cgc, | |
687 | void __user *arg) | |
688 | { | |
689 | #ifdef CONFIG_COMPAT | |
690 | if (in_compat_syscall()) { | |
691 | struct compat_cdrom_generic_command cgc32 = { | |
692 | .buffer = (uintptr_t)(cgc->buffer), | |
693 | .buflen = cgc->buflen, | |
694 | .stat = cgc->stat, | |
695 | .sense = (uintptr_t)(cgc->sense), | |
696 | .data_direction = cgc->data_direction, | |
697 | .quiet = cgc->quiet, | |
698 | .timeout = cgc->timeout, | |
699 | .reserved[0] = (uintptr_t)(cgc->reserved[0]), | |
700 | }; | |
701 | memcpy(&cgc32.cmd, &cgc->cmd, CDROM_PACKET_SIZE); | |
702 | ||
703 | if (copy_to_user(arg, &cgc32, sizeof(cgc32))) | |
704 | return -EFAULT; | |
705 | ||
706 | return 0; | |
707 | } | |
708 | #endif | |
709 | if (copy_to_user(arg, cgc, sizeof(*cgc))) | |
710 | return -EFAULT; | |
711 | ||
712 | return 0; | |
713 | } | |
714 | ||
715 | static int scsi_cdrom_send_packet(struct request_queue *q, | |
716 | struct gendisk *bd_disk, | |
717 | fmode_t mode, void __user *arg) | |
718 | { | |
719 | struct cdrom_generic_command cgc; | |
720 | struct sg_io_hdr hdr; | |
721 | int err; | |
722 | ||
723 | err = scsi_get_cdrom_generic_arg(&cgc, arg); | |
724 | if (err) | |
725 | return err; | |
726 | ||
727 | cgc.timeout = clock_t_to_jiffies(cgc.timeout); | |
728 | memset(&hdr, 0, sizeof(hdr)); | |
729 | hdr.interface_id = 'S'; | |
730 | hdr.cmd_len = sizeof(cgc.cmd); | |
731 | hdr.dxfer_len = cgc.buflen; | |
732 | switch (cgc.data_direction) { | |
733 | case CGC_DATA_UNKNOWN: | |
734 | hdr.dxfer_direction = SG_DXFER_UNKNOWN; | |
735 | break; | |
736 | case CGC_DATA_WRITE: | |
737 | hdr.dxfer_direction = SG_DXFER_TO_DEV; | |
738 | break; | |
739 | case CGC_DATA_READ: | |
740 | hdr.dxfer_direction = SG_DXFER_FROM_DEV; | |
741 | break; | |
742 | case CGC_DATA_NONE: | |
743 | hdr.dxfer_direction = SG_DXFER_NONE; | |
744 | break; | |
745 | default: | |
746 | return -EINVAL; | |
747 | } | |
748 | ||
749 | hdr.dxferp = cgc.buffer; | |
750 | hdr.sbp = cgc.sense; | |
751 | if (hdr.sbp) | |
752 | hdr.mx_sb_len = sizeof(struct request_sense); | |
753 | hdr.timeout = jiffies_to_msecs(cgc.timeout); | |
754 | hdr.cmdp = ((struct cdrom_generic_command __user*) arg)->cmd; | |
755 | hdr.cmd_len = sizeof(cgc.cmd); | |
756 | ||
757 | err = sg_io(q, bd_disk, &hdr, mode); | |
758 | if (err == -EFAULT) | |
759 | return -EFAULT; | |
760 | ||
761 | if (hdr.status) | |
762 | return -EIO; | |
763 | ||
764 | cgc.stat = err; | |
765 | cgc.buflen = hdr.resid; | |
766 | if (scsi_put_cdrom_generic_arg(&cgc, arg)) | |
767 | return -EFAULT; | |
768 | ||
769 | return err; | |
770 | } | |
771 | ||
74f3c8af AV |
772 | int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mode, |
773 | unsigned int cmd, void __user *arg) | |
1da177e4 | 774 | { |
f98d2dfd | 775 | int err; |
1da177e4 | 776 | |
315fceee | 777 | if (!q) |
1da177e4 LT |
778 | return -ENXIO; |
779 | ||
780 | switch (cmd) { | |
781 | /* | |
782 | * new sgv3 interface | |
783 | */ | |
784 | case SG_GET_VERSION_NUM: | |
785 | err = sg_get_version(arg); | |
786 | break; | |
787 | case SCSI_IOCTL_GET_IDLUN: | |
788 | err = scsi_get_idlun(q, arg); | |
789 | break; | |
790 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
791 | err = scsi_get_bus(q, arg); | |
792 | break; | |
793 | case SG_SET_TIMEOUT: | |
794 | err = sg_set_timeout(q, arg); | |
795 | break; | |
796 | case SG_GET_TIMEOUT: | |
797 | err = sg_get_timeout(q); | |
798 | break; | |
799 | case SG_GET_RESERVED_SIZE: | |
800 | err = sg_get_reserved_size(q, arg); | |
801 | break; | |
802 | case SG_SET_RESERVED_SIZE: | |
803 | err = sg_set_reserved_size(q, arg); | |
804 | break; | |
805 | case SG_EMULATED_HOST: | |
806 | err = sg_emulated_host(q, arg); | |
807 | break; | |
808 | case SG_IO: { | |
809 | struct sg_io_hdr hdr; | |
810 | ||
98aaaec4 AB |
811 | err = get_sg_io_hdr(&hdr, arg); |
812 | if (err) | |
1da177e4 | 813 | break; |
74f3c8af | 814 | err = sg_io(q, bd_disk, &hdr, mode); |
1da177e4 LT |
815 | if (err == -EFAULT) |
816 | break; | |
817 | ||
98aaaec4 | 818 | if (put_sg_io_hdr(&hdr, arg)) |
1da177e4 LT |
819 | err = -EFAULT; |
820 | break; | |
821 | } | |
f3ee6e63 AB |
822 | case CDROM_SEND_PACKET: |
823 | err = scsi_cdrom_send_packet(q, bd_disk, mode, arg); | |
1da177e4 | 824 | break; |
1da177e4 LT |
825 | |
826 | /* | |
827 | * old junk scsi send command ioctl | |
828 | */ | |
829 | case SCSI_IOCTL_SEND_COMMAND: | |
830 | printk(KERN_WARNING "program %s is using a deprecated SCSI ioctl, please convert it to SG_IO\n", current->comm); | |
831 | err = -EINVAL; | |
832 | if (!arg) | |
833 | break; | |
834 | ||
74f3c8af | 835 | err = sg_scsi_ioctl(q, bd_disk, mode, arg); |
1da177e4 LT |
836 | break; |
837 | case CDROMCLOSETRAY: | |
f98d2dfd BC |
838 | err = blk_send_start_stop(q, bd_disk, 0x03); |
839 | break; | |
1da177e4 | 840 | case CDROMEJECT: |
f98d2dfd | 841 | err = blk_send_start_stop(q, bd_disk, 0x02); |
1da177e4 LT |
842 | break; |
843 | default: | |
844 | err = -ENOTTY; | |
845 | } | |
846 | ||
1da177e4 LT |
847 | return err; |
848 | } | |
1da177e4 | 849 | EXPORT_SYMBOL(scsi_cmd_ioctl); |
018e0446 | 850 | |
0bfc96cb PB |
851 | int scsi_verify_blk_ioctl(struct block_device *bd, unsigned int cmd) |
852 | { | |
853 | if (bd && bd == bd->bd_contains) | |
854 | return 0; | |
855 | ||
6d935928 JK |
856 | if (capable(CAP_SYS_RAWIO)) |
857 | return 0; | |
858 | ||
6d935928 | 859 | return -ENOIOCTLCMD; |
0bfc96cb PB |
860 | } |
861 | EXPORT_SYMBOL(scsi_verify_blk_ioctl); | |
862 | ||
577ebb37 PB |
863 | int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode, |
864 | unsigned int cmd, void __user *arg) | |
865 | { | |
0bfc96cb PB |
866 | int ret; |
867 | ||
868 | ret = scsi_verify_blk_ioctl(bd, cmd); | |
869 | if (ret < 0) | |
870 | return ret; | |
871 | ||
577ebb37 PB |
872 | return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg); |
873 | } | |
874 | EXPORT_SYMBOL(scsi_cmd_blk_ioctl); | |
875 | ||
c8d9cf22 BVA |
876 | /** |
877 | * scsi_req_init - initialize certain fields of a scsi_request structure | |
878 | * @req: Pointer to a scsi_request structure. | |
879 | * Initializes .__cmd[], .cmd, .cmd_len and .sense_len but no other members | |
880 | * of struct scsi_request. | |
881 | */ | |
882 | void scsi_req_init(struct scsi_request *req) | |
82ed4db4 | 883 | { |
82ed4db4 CH |
884 | memset(req->__cmd, 0, sizeof(req->__cmd)); |
885 | req->cmd = req->__cmd; | |
886 | req->cmd_len = BLK_MAX_CDB; | |
887 | req->sense_len = 0; | |
888 | } | |
889 | EXPORT_SYMBOL(scsi_req_init); | |
890 | ||
476d42f1 | 891 | static int __init blk_scsi_ioctl_init(void) |
018e0446 JA |
892 | { |
893 | blk_set_cmd_filter_defaults(&blk_default_cmd_filter); | |
894 | return 0; | |
895 | } | |
76da0346 | 896 | fs_initcall(blk_scsi_ioctl_init); |