block/scsi_ioctl.c

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