fs/cifs/smb2ops.c

   1 /*
   2  *  SMB2 version specific operations
   3  *
   4  *  Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>
   5  *
   6  *  This library is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License v2 as published
   8  *  by the Free Software Foundation.
   9  *
  10  *  This library is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13  *  the GNU Lesser General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU Lesser General Public License
  16  *  along with this library; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 #include <linux/pagemap.h>
  21 #include <linux/vfs.h>
  22 #include <linux/falloc.h>
  23 #include <linux/scatterlist.h>
  24 #include <linux/uuid.h>
  25 #include <crypto/aead.h>
  26 #include "cifsglob.h"
  27 #include "smb2pdu.h"
  28 #include "smb2proto.h"
  29 #include "cifsproto.h"
  30 #include "cifs_debug.h"
  31 #include "cifs_unicode.h"
  32 #include "smb2status.h"
  33 #include "smb2glob.h"
  34 #include "cifs_ioctl.h"
  35
  36 static int
  37 change_conf(struct TCP_Server_Info *server)
  38 {
  39         server->credits += server->echo_credits + server->oplock_credits;
  40         server->oplock_credits = server->echo_credits = 0;
  41         switch (server->credits) {
  42         case 0:
  43                 return -1;
  44         case 1:
  45                 server->echoes = false;
  46                 server->oplocks = false;
  47                 cifs_dbg(VFS, "disabling echoes and oplocks\n");
  48                 break;
  49         case 2:
  50                 server->echoes = true;
  51                 server->oplocks = false;
  52                 server->echo_credits = 1;
  53                 cifs_dbg(FYI, "disabling oplocks\n");
  54                 break;
  55         default:
  56                 server->echoes = true;
  57                 if (enable_oplocks) {
  58                         server->oplocks = true;
  59                         server->oplock_credits = 1;
  60                 } else
  61                         server->oplocks = false;
  62
  63                 server->echo_credits = 1;
  64         }
  65         server->credits -= server->echo_credits + server->oplock_credits;
  66         return 0;
  67 }
  68
  69 static void
  70 smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add,
  71                  const int optype)
  72 {
  73         int *val, rc = 0;
  74         spin_lock(&server->req_lock);
  75         val = server->ops->get_credits_field(server, optype);
  76         *val += add;
  77         if (*val > 65000) {
  78                 *val = 65000; /* Don't get near 64K credits, avoid srv bugs */
  79                 printk_once(KERN_WARNING "server overflowed SMB3 credits\n");
  80         }
  81         server->in_flight--;
  82         if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP)
  83                 rc = change_conf(server);
  84         /*
  85          * Sometimes server returns 0 credits on oplock break ack - we need to
  86          * rebalance credits in this case.
  87          */
  88         else if (server->in_flight > 0 && server->oplock_credits == 0 &&
  89                  server->oplocks) {
  90                 if (server->credits > 1) {
  91                         server->credits--;
  92                         server->oplock_credits++;
  93                 }
  94         }
  95         spin_unlock(&server->req_lock);
  96         wake_up(&server->request_q);
  97         if (rc)
  98                 cifs_reconnect(server);
  99 }
 100
 101 static void
 102 smb2_set_credits(struct TCP_Server_Info *server, const int val)
 103 {
 104         spin_lock(&server->req_lock);
 105         server->credits = val;
 106         spin_unlock(&server->req_lock);
 107 }
 108
 109 static int *
 110 smb2_get_credits_field(struct TCP_Server_Info *server, const int optype)
 111 {
 112         switch (optype) {
 113         case CIFS_ECHO_OP:
 114                 return &server->echo_credits;
 115         case CIFS_OBREAK_OP:
 116                 return &server->oplock_credits;
 117         default:
 118                 return &server->credits;
 119         }
 120 }
 121
 122 static unsigned int
 123 smb2_get_credits(struct mid_q_entry *mid)
 124 {
 125         struct smb2_sync_hdr *shdr = get_sync_hdr(mid->resp_buf);
 126
 127         return le16_to_cpu(shdr->CreditRequest);
 128 }
 129
 130 static int
 131 smb2_wait_mtu_credits(struct TCP_Server_Info *server, unsigned int size,
 132                       unsigned int *num, unsigned int *credits)
 133 {
 134         int rc = 0;
 135         unsigned int scredits;
 136
 137         spin_lock(&server->req_lock);
 138         while (1) {
 139                 if (server->credits <= 0) {
 140                         spin_unlock(&server->req_lock);
 141                         cifs_num_waiters_inc(server);
 142                         rc = wait_event_killable(server->request_q,
 143                                         has_credits(server, &server->credits));
 144                         cifs_num_waiters_dec(server);
 145                         if (rc)
 146                                 return rc;
 147                         spin_lock(&server->req_lock);
 148                 } else {
 149                         if (server->tcpStatus == CifsExiting) {
 150                                 spin_unlock(&server->req_lock);
 151                                 return -ENOENT;
 152                         }
 153
 154                         scredits = server->credits;
 155                         /* can deadlock with reopen */
 156                         if (scredits == 1) {
 157                                 *num = SMB2_MAX_BUFFER_SIZE;
 158                                 *credits = 0;
 159                                 break;
 160                         }
 161
 162                         /* leave one credit for a possible reopen */
 163                         scredits--;
 164                         *num = min_t(unsigned int, size,
 165                                      scredits * SMB2_MAX_BUFFER_SIZE);
 166
 167                         *credits = DIV_ROUND_UP(*num, SMB2_MAX_BUFFER_SIZE);
 168                         server->credits -= *credits;
 169                         server->in_flight++;
 170                         break;
 171                 }
 172         }
 173         spin_unlock(&server->req_lock);
 174         return rc;
 175 }
 176
 177 static __u64
 178 smb2_get_next_mid(struct TCP_Server_Info *server)
 179 {
 180         __u64 mid;
 181         /* for SMB2 we need the current value */
 182         spin_lock(&GlobalMid_Lock);
 183         mid = server->CurrentMid++;
 184         spin_unlock(&GlobalMid_Lock);
 185         return mid;
 186 }
 187
 188 static struct mid_q_entry *
 189 smb2_find_mid(struct TCP_Server_Info *server, char *buf)
 190 {
 191         struct mid_q_entry *mid;
 192         struct smb2_sync_hdr *shdr = get_sync_hdr(buf);
 193         __u64 wire_mid = le64_to_cpu(shdr->MessageId);
 194
 195         if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
 196                 cifs_dbg(VFS, "encrypted frame parsing not supported yet");
 197                 return NULL;
 198         }
 199
 200         spin_lock(&GlobalMid_Lock);
 201         list_for_each_entry(mid, &server->pending_mid_q, qhead) {
 202                 if ((mid->mid == wire_mid) &&
 203                     (mid->mid_state == MID_REQUEST_SUBMITTED) &&
 204                     (mid->command == shdr->Command)) {
 205                         spin_unlock(&GlobalMid_Lock);
 206                         return mid;
 207                 }
 208         }
 209         spin_unlock(&GlobalMid_Lock);
 210         return NULL;
 211 }
 212
 213 static void
 214 smb2_dump_detail(void *buf)
 215 {
 216 #ifdef CONFIG_CIFS_DEBUG2
 217         struct smb2_sync_hdr *shdr = get_sync_hdr(buf);
 218
 219         cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d\n",
 220                  shdr->Command, shdr->Status, shdr->Flags, shdr->MessageId,
 221                  shdr->ProcessId);
 222         cifs_dbg(VFS, "smb buf %p len %u\n", buf, smb2_calc_size(buf));
 223 #endif
 224 }
 225
 226 static bool
 227 smb2_need_neg(struct TCP_Server_Info *server)
 228 {
 229         return server->max_read == 0;
 230 }
 231
 232 static int
 233 smb2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 234 {
 235         int rc;
 236         ses->server->CurrentMid = 0;
 237         rc = SMB2_negotiate(xid, ses);
 238         /* BB we probably don't need to retry with modern servers */
 239         if (rc == -EAGAIN)
 240                 rc = -EHOSTDOWN;
 241         return rc;
 242 }
 243
 244 static unsigned int
 245 smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 246 {
 247         struct TCP_Server_Info *server = tcon->ses->server;
 248         unsigned int wsize;
 249
 250         /* start with specified wsize, or default */
 251         wsize = volume_info->wsize ? volume_info->wsize : CIFS_DEFAULT_IOSIZE;
 252         wsize = min_t(unsigned int, wsize, server->max_write);
 253
 254         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 255                 wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
 256
 257         return wsize;
 258 }
 259
 260 static unsigned int
 261 smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
 262 {
 263         struct TCP_Server_Info *server = tcon->ses->server;
 264         unsigned int rsize;
 265
 266         /* start with specified rsize, or default */
 267         rsize = volume_info->rsize ? volume_info->rsize : CIFS_DEFAULT_IOSIZE;
 268         rsize = min_t(unsigned int, rsize, server->max_read);
 269
 270         if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 271                 rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
 272
 273         return rsize;
 274 }
 275
 276 #ifdef CONFIG_CIFS_STATS2
 277 static int
 278 SMB3_request_interfaces(const unsigned int xid, struct cifs_tcon *tcon)
 279 {
 280         int rc;
 281         unsigned int ret_data_len = 0;
 282         struct network_interface_info_ioctl_rsp *out_buf;
 283
 284         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 285                         FSCTL_QUERY_NETWORK_INTERFACE_INFO, true /* is_fsctl */,
 286                         false /* use_ipc */,
 287                         NULL /* no data input */, 0 /* no data input */,
 288                         (char **)&out_buf, &ret_data_len);
 289         if (rc != 0)
 290                 cifs_dbg(VFS, "error %d on ioctl to get interface list\n", rc);
 291         else if (ret_data_len < sizeof(struct network_interface_info_ioctl_rsp)) {
 292                 cifs_dbg(VFS, "server returned bad net interface info buf\n");
 293                 rc = -EINVAL;
 294         } else {
 295                 /* Dump info on first interface */
 296                 cifs_dbg(FYI, "Adapter Capability 0x%x\t",
 297                         le32_to_cpu(out_buf->Capability));
 298                 cifs_dbg(FYI, "Link Speed %lld\n",
 299                         le64_to_cpu(out_buf->LinkSpeed));
 300         }
 301         kfree(out_buf);
 302         return rc;
 303 }
 304 #endif /* STATS2 */
 305
 306 static void
 307 smb3_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
 308 {
 309         int rc;
 310         __le16 srch_path = 0; /* Null - open root of share */
 311         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 312         struct cifs_open_parms oparms;
 313         struct cifs_fid fid;
 314
 315         oparms.tcon = tcon;
 316         oparms.desired_access = FILE_READ_ATTRIBUTES;
 317         oparms.disposition = FILE_OPEN;
 318         oparms.create_options = 0;
 319         oparms.fid = &fid;
 320         oparms.reconnect = false;
 321
 322         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
 323         if (rc)
 324                 return;
 325
 326 #ifdef CONFIG_CIFS_STATS2
 327         SMB3_request_interfaces(xid, tcon);
 328 #endif /* STATS2 */
 329
 330         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 331                         FS_ATTRIBUTE_INFORMATION);
 332         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 333                         FS_DEVICE_INFORMATION);
 334         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 335                         FS_SECTOR_SIZE_INFORMATION); /* SMB3 specific */
 336         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 337         return;
 338 }
 339
 340 static void
 341 smb2_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon)
 342 {
 343         int rc;
 344         __le16 srch_path = 0; /* Null - open root of share */
 345         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 346         struct cifs_open_parms oparms;
 347         struct cifs_fid fid;
 348
 349         oparms.tcon = tcon;
 350         oparms.desired_access = FILE_READ_ATTRIBUTES;
 351         oparms.disposition = FILE_OPEN;
 352         oparms.create_options = 0;
 353         oparms.fid = &fid;
 354         oparms.reconnect = false;
 355
 356         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
 357         if (rc)
 358                 return;
 359
 360         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 361                         FS_ATTRIBUTE_INFORMATION);
 362         SMB2_QFS_attr(xid, tcon, fid.persistent_fid, fid.volatile_fid,
 363                         FS_DEVICE_INFORMATION);
 364         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 365         return;
 366 }
 367
 368 static int
 369 smb2_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,
 370                         struct cifs_sb_info *cifs_sb, const char *full_path)
 371 {
 372         int rc;
 373         __le16 *utf16_path;
 374         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 375         struct cifs_open_parms oparms;
 376         struct cifs_fid fid;
 377
 378         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
 379         if (!utf16_path)
 380                 return -ENOMEM;
 381
 382         oparms.tcon = tcon;
 383         oparms.desired_access = FILE_READ_ATTRIBUTES;
 384         oparms.disposition = FILE_OPEN;
 385         oparms.create_options = 0;
 386         oparms.fid = &fid;
 387         oparms.reconnect = false;
 388
 389         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
 390         if (rc) {
 391                 kfree(utf16_path);
 392                 return rc;
 393         }
 394
 395         rc = SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 396         kfree(utf16_path);
 397         return rc;
 398 }
 399
 400 static int
 401 smb2_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,
 402                   struct cifs_sb_info *cifs_sb, const char *full_path,
 403                   u64 *uniqueid, FILE_ALL_INFO *data)
 404 {
 405         *uniqueid = le64_to_cpu(data->IndexNumber);
 406         return 0;
 407 }
 408
 409 static int
 410 smb2_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,
 411                      struct cifs_fid *fid, FILE_ALL_INFO *data)
 412 {
 413         int rc;
 414         struct smb2_file_all_info *smb2_data;
 415
 416         smb2_data = kzalloc(sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
 417                             GFP_KERNEL);
 418         if (smb2_data == NULL)
 419                 return -ENOMEM;
 420
 421         rc = SMB2_query_info(xid, tcon, fid->persistent_fid, fid->volatile_fid,
 422                              smb2_data);
 423         if (!rc)
 424                 move_smb2_info_to_cifs(data, smb2_data);
 425         kfree(smb2_data);
 426         return rc;
 427 }
 428
 429 #ifdef CONFIG_CIFS_XATTR
 430 static ssize_t
 431 move_smb2_ea_to_cifs(char *dst, size_t dst_size,
 432                      struct smb2_file_full_ea_info *src, size_t src_size,
 433                      const unsigned char *ea_name)
 434 {
 435         int rc = 0;
 436         unsigned int ea_name_len = ea_name ? strlen(ea_name) : 0;
 437         char *name, *value;
 438         size_t name_len, value_len, user_name_len;
 439
 440         while (src_size > 0) {
 441                 name = &src->ea_data[0];
 442                 name_len = (size_t)src->ea_name_length;
 443                 value = &src->ea_data[src->ea_name_length + 1];
 444                 value_len = (size_t)le16_to_cpu(src->ea_value_length);
 445
 446                 if (name_len == 0) {
 447                         break;
 448                 }
 449
 450                 if (src_size < 8 + name_len + 1 + value_len) {
 451                         cifs_dbg(FYI, "EA entry goes beyond length of list\n");
 452                         rc = -EIO;
 453                         goto out;
 454                 }
 455
 456                 if (ea_name) {
 457                         if (ea_name_len == name_len &&
 458                             memcmp(ea_name, name, name_len) == 0) {
 459                                 rc = value_len;
 460                                 if (dst_size == 0)
 461                                         goto out;
 462                                 if (dst_size < value_len) {
 463                                         rc = -ERANGE;
 464                                         goto out;
 465                                 }
 466                                 memcpy(dst, value, value_len);
 467                                 goto out;
 468                         }
 469                 } else {
 470                         /* 'user.' plus a terminating null */
 471                         user_name_len = 5 + 1 + name_len;
 472
 473                         rc += user_name_len;
 474
 475                         if (dst_size >= user_name_len) {
 476                                 dst_size -= user_name_len;
 477                                 memcpy(dst, "user.", 5);
 478                                 dst += 5;
 479                                 memcpy(dst, src->ea_data, name_len);
 480                                 dst += name_len;
 481                                 *dst = 0;
 482                                 ++dst;
 483                         } else if (dst_size == 0) {
 484                                 /* skip copy - calc size only */
 485                         } else {
 486                                 /* stop before overrun buffer */
 487                                 rc = -ERANGE;
 488                                 break;
 489                         }
 490                 }
 491
 492                 if (!src->next_entry_offset)
 493                         break;
 494
 495                 if (src_size < le32_to_cpu(src->next_entry_offset)) {
 496                         /* stop before overrun buffer */
 497                         rc = -ERANGE;
 498                         break;
 499                 }
 500                 src_size -= le32_to_cpu(src->next_entry_offset);
 501                 src = (void *)((char *)src +
 502                                le32_to_cpu(src->next_entry_offset));
 503         }
 504
 505         /* didn't find the named attribute */
 506         if (ea_name)
 507                 rc = -ENODATA;
 508
 509 out:
 510         return (ssize_t)rc;
 511 }
 512
 513 static ssize_t
 514 smb2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
 515                const unsigned char *path, const unsigned char *ea_name,
 516                char *ea_data, size_t buf_size,
 517                struct cifs_sb_info *cifs_sb)
 518 {
 519         int rc;
 520         __le16 *utf16_path;
 521         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 522         struct cifs_open_parms oparms;
 523         struct cifs_fid fid;
 524         struct smb2_file_full_ea_info *smb2_data;
 525         int ea_buf_size = SMB2_MIN_EA_BUF;
 526
 527         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
 528         if (!utf16_path)
 529                 return -ENOMEM;
 530
 531         oparms.tcon = tcon;
 532         oparms.desired_access = FILE_READ_EA;
 533         oparms.disposition = FILE_OPEN;
 534         oparms.create_options = 0;
 535         oparms.fid = &fid;
 536         oparms.reconnect = false;
 537
 538         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
 539         kfree(utf16_path);
 540         if (rc) {
 541                 cifs_dbg(FYI, "open failed rc=%d\n", rc);
 542                 return rc;
 543         }
 544
 545         while (1) {
 546                 smb2_data = kzalloc(ea_buf_size, GFP_KERNEL);
 547                 if (smb2_data == NULL) {
 548                         SMB2_close(xid, tcon, fid.persistent_fid,
 549                                    fid.volatile_fid);
 550                         return -ENOMEM;
 551                 }
 552
 553                 rc = SMB2_query_eas(xid, tcon, fid.persistent_fid,
 554                                     fid.volatile_fid,
 555                                     ea_buf_size, smb2_data);
 556
 557                 if (rc != -E2BIG)
 558                         break;
 559
 560                 kfree(smb2_data);
 561                 ea_buf_size <<= 1;
 562
 563                 if (ea_buf_size > SMB2_MAX_EA_BUF) {
 564                         cifs_dbg(VFS, "EA size is too large\n");
 565                         SMB2_close(xid, tcon, fid.persistent_fid,
 566                                    fid.volatile_fid);
 567                         return -ENOMEM;
 568                 }
 569         }
 570
 571         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 572
 573         if (!rc)
 574                 rc = move_smb2_ea_to_cifs(ea_data, buf_size, smb2_data,
 575                                           SMB2_MAX_EA_BUF, ea_name);
 576
 577         kfree(smb2_data);
 578         return rc;
 579 }
 580
 581
 582 static int
 583 smb2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
 584             const char *path, const char *ea_name, const void *ea_value,
 585             const __u16 ea_value_len, const struct nls_table *nls_codepage,
 586             struct cifs_sb_info *cifs_sb)
 587 {
 588         int rc;
 589         __le16 *utf16_path;
 590         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
 591         struct cifs_open_parms oparms;
 592         struct cifs_fid fid;
 593         struct smb2_file_full_ea_info *ea;
 594         int ea_name_len = strlen(ea_name);
 595         int len;
 596
 597         if (ea_name_len > 255)
 598                 return -EINVAL;
 599
 600         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
 601         if (!utf16_path)
 602                 return -ENOMEM;
 603
 604         oparms.tcon = tcon;
 605         oparms.desired_access = FILE_WRITE_EA;
 606         oparms.disposition = FILE_OPEN;
 607         oparms.create_options = 0;
 608         oparms.fid = &fid;
 609         oparms.reconnect = false;
 610
 611         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
 612         kfree(utf16_path);
 613         if (rc) {
 614                 cifs_dbg(FYI, "open failed rc=%d\n", rc);
 615                 return rc;
 616         }
 617
 618         len = sizeof(ea) + ea_name_len + ea_value_len + 1;
 619         ea = kzalloc(len, GFP_KERNEL);
 620         if (ea == NULL) {
 621                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 622                 return -ENOMEM;
 623         }
 624
 625         ea->ea_name_length = ea_name_len;
 626         ea->ea_value_length = cpu_to_le16(ea_value_len);
 627         memcpy(ea->ea_data, ea_name, ea_name_len + 1);
 628         memcpy(ea->ea_data + ea_name_len + 1, ea_value, ea_value_len);
 629
 630         rc = SMB2_set_ea(xid, tcon, fid.persistent_fid, fid.volatile_fid, ea,
 631                          len);
 632         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
 633
 634         return rc;
 635 }
 636 #endif
 637
 638 static bool
 639 smb2_can_echo(struct TCP_Server_Info *server)
 640 {
 641         return server->echoes;
 642 }
 643
 644 static void
 645 smb2_clear_stats(struct cifs_tcon *tcon)
 646 {
 647 #ifdef CONFIG_CIFS_STATS
 648         int i;
 649         for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
 650                 atomic_set(&tcon->stats.smb2_stats.smb2_com_sent[i], 0);
 651                 atomic_set(&tcon->stats.smb2_stats.smb2_com_failed[i], 0);
 652         }
 653 #endif
 654 }
 655
 656 static void
 657 smb2_dump_share_caps(struct seq_file *m, struct cifs_tcon *tcon)
 658 {
 659         seq_puts(m, "\n\tShare Capabilities:");
 660         if (tcon->capabilities & SMB2_SHARE_CAP_DFS)
 661                 seq_puts(m, " DFS,");
 662         if (tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
 663                 seq_puts(m, " CONTINUOUS AVAILABILITY,");
 664         if (tcon->capabilities & SMB2_SHARE_CAP_SCALEOUT)
 665                 seq_puts(m, " SCALEOUT,");
 666         if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER)
 667                 seq_puts(m, " CLUSTER,");
 668         if (tcon->capabilities & SMB2_SHARE_CAP_ASYMMETRIC)
 669                 seq_puts(m, " ASYMMETRIC,");
 670         if (tcon->capabilities == 0)
 671                 seq_puts(m, " None");
 672         if (tcon->ss_flags & SSINFO_FLAGS_ALIGNED_DEVICE)
 673                 seq_puts(m, " Aligned,");
 674         if (tcon->ss_flags & SSINFO_FLAGS_PARTITION_ALIGNED_ON_DEVICE)
 675                 seq_puts(m, " Partition Aligned,");
 676         if (tcon->ss_flags & SSINFO_FLAGS_NO_SEEK_PENALTY)
 677                 seq_puts(m, " SSD,");
 678         if (tcon->ss_flags & SSINFO_FLAGS_TRIM_ENABLED)
 679                 seq_puts(m, " TRIM-support,");
 680
 681         seq_printf(m, "\tShare Flags: 0x%x", tcon->share_flags);
 682         if (tcon->perf_sector_size)
 683                 seq_printf(m, "\tOptimal sector size: 0x%x",
 684                            tcon->perf_sector_size);
 685 }
 686
 687 static void
 688 smb2_print_stats(struct seq_file *m, struct cifs_tcon *tcon)
 689 {
 690 #ifdef CONFIG_CIFS_STATS
 691         atomic_t *sent = tcon->stats.smb2_stats.smb2_com_sent;
 692         atomic_t *failed = tcon->stats.smb2_stats.smb2_com_failed;
 693         seq_printf(m, "\nNegotiates: %d sent %d failed",
 694                    atomic_read(&sent[SMB2_NEGOTIATE_HE]),
 695                    atomic_read(&failed[SMB2_NEGOTIATE_HE]));
 696         seq_printf(m, "\nSessionSetups: %d sent %d failed",
 697                    atomic_read(&sent[SMB2_SESSION_SETUP_HE]),
 698                    atomic_read(&failed[SMB2_SESSION_SETUP_HE]));
 699         seq_printf(m, "\nLogoffs: %d sent %d failed",
 700                    atomic_read(&sent[SMB2_LOGOFF_HE]),
 701                    atomic_read(&failed[SMB2_LOGOFF_HE]));
 702         seq_printf(m, "\nTreeConnects: %d sent %d failed",
 703                    atomic_read(&sent[SMB2_TREE_CONNECT_HE]),
 704                    atomic_read(&failed[SMB2_TREE_CONNECT_HE]));
 705         seq_printf(m, "\nTreeDisconnects: %d sent %d failed",
 706                    atomic_read(&sent[SMB2_TREE_DISCONNECT_HE]),
 707                    atomic_read(&failed[SMB2_TREE_DISCONNECT_HE]));
 708         seq_printf(m, "\nCreates: %d sent %d failed",
 709                    atomic_read(&sent[SMB2_CREATE_HE]),
 710                    atomic_read(&failed[SMB2_CREATE_HE]));
 711         seq_printf(m, "\nCloses: %d sent %d failed",
 712                    atomic_read(&sent[SMB2_CLOSE_HE]),
 713                    atomic_read(&failed[SMB2_CLOSE_HE]));
 714         seq_printf(m, "\nFlushes: %d sent %d failed",
 715                    atomic_read(&sent[SMB2_FLUSH_HE]),
 716                    atomic_read(&failed[SMB2_FLUSH_HE]));
 717         seq_printf(m, "\nReads: %d sent %d failed",
 718                    atomic_read(&sent[SMB2_READ_HE]),
 719                    atomic_read(&failed[SMB2_READ_HE]));
 720         seq_printf(m, "\nWrites: %d sent %d failed",
 721                    atomic_read(&sent[SMB2_WRITE_HE]),
 722                    atomic_read(&failed[SMB2_WRITE_HE]));
 723         seq_printf(m, "\nLocks: %d sent %d failed",
 724                    atomic_read(&sent[SMB2_LOCK_HE]),
 725                    atomic_read(&failed[SMB2_LOCK_HE]));
 726         seq_printf(m, "\nIOCTLs: %d sent %d failed",
 727                    atomic_read(&sent[SMB2_IOCTL_HE]),
 728                    atomic_read(&failed[SMB2_IOCTL_HE]));
 729         seq_printf(m, "\nCancels: %d sent %d failed",
 730                    atomic_read(&sent[SMB2_CANCEL_HE]),
 731                    atomic_read(&failed[SMB2_CANCEL_HE]));
 732         seq_printf(m, "\nEchos: %d sent %d failed",
 733                    atomic_read(&sent[SMB2_ECHO_HE]),
 734                    atomic_read(&failed[SMB2_ECHO_HE]));
 735         seq_printf(m, "\nQueryDirectories: %d sent %d failed",
 736                    atomic_read(&sent[SMB2_QUERY_DIRECTORY_HE]),
 737                    atomic_read(&failed[SMB2_QUERY_DIRECTORY_HE]));
 738         seq_printf(m, "\nChangeNotifies: %d sent %d failed",
 739                    atomic_read(&sent[SMB2_CHANGE_NOTIFY_HE]),
 740                    atomic_read(&failed[SMB2_CHANGE_NOTIFY_HE]));
 741         seq_printf(m, "\nQueryInfos: %d sent %d failed",
 742                    atomic_read(&sent[SMB2_QUERY_INFO_HE]),
 743                    atomic_read(&failed[SMB2_QUERY_INFO_HE]));
 744         seq_printf(m, "\nSetInfos: %d sent %d failed",
 745                    atomic_read(&sent[SMB2_SET_INFO_HE]),
 746                    atomic_read(&failed[SMB2_SET_INFO_HE]));
 747         seq_printf(m, "\nOplockBreaks: %d sent %d failed",
 748                    atomic_read(&sent[SMB2_OPLOCK_BREAK_HE]),
 749                    atomic_read(&failed[SMB2_OPLOCK_BREAK_HE]));
 750 #endif
 751 }
 752
 753 static void
 754 smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
 755 {
 756         struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
 757         struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server;
 758
 759         cfile->fid.persistent_fid = fid->persistent_fid;
 760         cfile->fid.volatile_fid = fid->volatile_fid;
 761         server->ops->set_oplock_level(cinode, oplock, fid->epoch,
 762                                       &fid->purge_cache);
 763         cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
 764         memcpy(cfile->fid.create_guid, fid->create_guid, 16);
 765 }
 766
 767 static void
 768 smb2_close_file(const unsigned int xid, struct cifs_tcon *tcon,
 769                 struct cifs_fid *fid)
 770 {
 771         SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 772 }
 773
 774 static int
 775 SMB2_request_res_key(const unsigned int xid, struct cifs_tcon *tcon,
 776                      u64 persistent_fid, u64 volatile_fid,
 777                      struct copychunk_ioctl *pcchunk)
 778 {
 779         int rc;
 780         unsigned int ret_data_len;
 781         struct resume_key_req *res_key;
 782
 783         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
 784                         FSCTL_SRV_REQUEST_RESUME_KEY, true /* is_fsctl */,
 785                         false /* use_ipc */,
 786                         NULL, 0 /* no input */,
 787                         (char **)&res_key, &ret_data_len);
 788
 789         if (rc) {
 790                 cifs_dbg(VFS, "refcpy ioctl error %d getting resume key\n", rc);
 791                 goto req_res_key_exit;
 792         }
 793         if (ret_data_len < sizeof(struct resume_key_req)) {
 794                 cifs_dbg(VFS, "Invalid refcopy resume key length\n");
 795                 rc = -EINVAL;
 796                 goto req_res_key_exit;
 797         }
 798         memcpy(pcchunk->SourceKey, res_key->ResumeKey, COPY_CHUNK_RES_KEY_SIZE);
 799
 800 req_res_key_exit:
 801         kfree(res_key);
 802         return rc;
 803 }
 804
 805 static ssize_t
 806 smb2_copychunk_range(const unsigned int xid,
 807                         struct cifsFileInfo *srcfile,
 808                         struct cifsFileInfo *trgtfile, u64 src_off,
 809                         u64 len, u64 dest_off)
 810 {
 811         int rc;
 812         unsigned int ret_data_len;
 813         struct copychunk_ioctl *pcchunk;
 814         struct copychunk_ioctl_rsp *retbuf = NULL;
 815         struct cifs_tcon *tcon;
 816         int chunks_copied = 0;
 817         bool chunk_sizes_updated = false;
 818         ssize_t bytes_written, total_bytes_written = 0;
 819
 820         pcchunk = kmalloc(sizeof(struct copychunk_ioctl), GFP_KERNEL);
 821
 822         if (pcchunk == NULL)
 823                 return -ENOMEM;
 824
 825         cifs_dbg(FYI, "in smb2_copychunk_range - about to call request res key\n");
 826         /* Request a key from the server to identify the source of the copy */
 827         rc = SMB2_request_res_key(xid, tlink_tcon(srcfile->tlink),
 828                                 srcfile->fid.persistent_fid,
 829                                 srcfile->fid.volatile_fid, pcchunk);
 830
 831         /* Note: request_res_key sets res_key null only if rc !=0 */
 832         if (rc)
 833                 goto cchunk_out;
 834
 835         /* For now array only one chunk long, will make more flexible later */
 836         pcchunk->ChunkCount = cpu_to_le32(1);
 837         pcchunk->Reserved = 0;
 838         pcchunk->Reserved2 = 0;
 839
 840         tcon = tlink_tcon(trgtfile->tlink);
 841
 842         while (len > 0) {
 843                 pcchunk->SourceOffset = cpu_to_le64(src_off);
 844                 pcchunk->TargetOffset = cpu_to_le64(dest_off);
 845                 pcchunk->Length =
 846                         cpu_to_le32(min_t(u32, len, tcon->max_bytes_chunk));
 847
 848                 /* Request server copy to target from src identified by key */
 849                 rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
 850                         trgtfile->fid.volatile_fid, FSCTL_SRV_COPYCHUNK_WRITE,
 851                         true /* is_fsctl */, false /* use_ipc */,
 852                         (char *)pcchunk,
 853                         sizeof(struct copychunk_ioctl), (char **)&retbuf,
 854                         &ret_data_len);
 855                 if (rc == 0) {
 856                         if (ret_data_len !=
 857                                         sizeof(struct copychunk_ioctl_rsp)) {
 858                                 cifs_dbg(VFS, "invalid cchunk response size\n");
 859                                 rc = -EIO;
 860                                 goto cchunk_out;
 861                         }
 862                         if (retbuf->TotalBytesWritten == 0) {
 863                                 cifs_dbg(FYI, "no bytes copied\n");
 864                                 rc = -EIO;
 865                                 goto cchunk_out;
 866                         }
 867                         /*
 868                          * Check if server claimed to write more than we asked
 869                          */
 870                         if (le32_to_cpu(retbuf->TotalBytesWritten) >
 871                             le32_to_cpu(pcchunk->Length)) {
 872                                 cifs_dbg(VFS, "invalid copy chunk response\n");
 873                                 rc = -EIO;
 874                                 goto cchunk_out;
 875                         }
 876                         if (le32_to_cpu(retbuf->ChunksWritten) != 1) {
 877                                 cifs_dbg(VFS, "invalid num chunks written\n");
 878                                 rc = -EIO;
 879                                 goto cchunk_out;
 880                         }
 881                         chunks_copied++;
 882
 883                         bytes_written = le32_to_cpu(retbuf->TotalBytesWritten);
 884                         src_off += bytes_written;
 885                         dest_off += bytes_written;
 886                         len -= bytes_written;
 887                         total_bytes_written += bytes_written;
 888
 889                         cifs_dbg(FYI, "Chunks %d PartialChunk %d Total %zu\n",
 890                                 le32_to_cpu(retbuf->ChunksWritten),
 891                                 le32_to_cpu(retbuf->ChunkBytesWritten),
 892                                 bytes_written);
 893                 } else if (rc == -EINVAL) {
 894                         if (ret_data_len != sizeof(struct copychunk_ioctl_rsp))
 895                                 goto cchunk_out;
 896
 897                         cifs_dbg(FYI, "MaxChunks %d BytesChunk %d MaxCopy %d\n",
 898                                 le32_to_cpu(retbuf->ChunksWritten),
 899                                 le32_to_cpu(retbuf->ChunkBytesWritten),
 900                                 le32_to_cpu(retbuf->TotalBytesWritten));
 901
 902                         /*
 903                          * Check if this is the first request using these sizes,
 904                          * (ie check if copy succeed once with original sizes
 905                          * and check if the server gave us different sizes after
 906                          * we already updated max sizes on previous request).
 907                          * if not then why is the server returning an error now
 908                          */
 909                         if ((chunks_copied != 0) || chunk_sizes_updated)
 910                                 goto cchunk_out;
 911
 912                         /* Check that server is not asking us to grow size */
 913                         if (le32_to_cpu(retbuf->ChunkBytesWritten) <
 914                                         tcon->max_bytes_chunk)
 915                                 tcon->max_bytes_chunk =
 916                                         le32_to_cpu(retbuf->ChunkBytesWritten);
 917                         else
 918                                 goto cchunk_out; /* server gave us bogus size */
 919
 920                         /* No need to change MaxChunks since already set to 1 */
 921                         chunk_sizes_updated = true;
 922                 } else
 923                         goto cchunk_out;
 924         }
 925
 926 cchunk_out:
 927         kfree(pcchunk);
 928         kfree(retbuf);
 929         if (rc)
 930                 return rc;
 931         else
 932                 return total_bytes_written;
 933 }
 934
 935 static int
 936 smb2_flush_file(const unsigned int xid, struct cifs_tcon *tcon,
 937                 struct cifs_fid *fid)
 938 {
 939         return SMB2_flush(xid, tcon, fid->persistent_fid, fid->volatile_fid);
 940 }
 941
 942 static unsigned int
 943 smb2_read_data_offset(char *buf)
 944 {
 945         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
 946         return rsp->DataOffset;
 947 }
 948
 949 static unsigned int
 950 smb2_read_data_length(char *buf)
 951 {
 952         struct smb2_read_rsp *rsp = (struct smb2_read_rsp *)buf;
 953         return le32_to_cpu(rsp->DataLength);
 954 }
 955
 956
 957 static int
 958 smb2_sync_read(const unsigned int xid, struct cifs_fid *pfid,
 959                struct cifs_io_parms *parms, unsigned int *bytes_read,
 960                char **buf, int *buf_type)
 961 {
 962         parms->persistent_fid = pfid->persistent_fid;
 963         parms->volatile_fid = pfid->volatile_fid;
 964         return SMB2_read(xid, parms, bytes_read, buf, buf_type);
 965 }
 966
 967 static int
 968 smb2_sync_write(const unsigned int xid, struct cifs_fid *pfid,
 969                 struct cifs_io_parms *parms, unsigned int *written,
 970                 struct kvec *iov, unsigned long nr_segs)
 971 {
 972
 973         parms->persistent_fid = pfid->persistent_fid;
 974         parms->volatile_fid = pfid->volatile_fid;
 975         return SMB2_write(xid, parms, written, iov, nr_segs);
 976 }
 977
 978 /* Set or clear the SPARSE_FILE attribute based on value passed in setsparse */
 979 static bool smb2_set_sparse(const unsigned int xid, struct cifs_tcon *tcon,
 980                 struct cifsFileInfo *cfile, struct inode *inode, __u8 setsparse)
 981 {
 982         struct cifsInodeInfo *cifsi;
 983         int rc;
 984
 985         cifsi = CIFS_I(inode);
 986
 987         /* if file already sparse don't bother setting sparse again */
 988         if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && setsparse)
 989                 return true; /* already sparse */
 990
 991         if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) && !setsparse)
 992                 return true; /* already not sparse */
 993
 994         /*
 995          * Can't check for sparse support on share the usual way via the
 996          * FS attribute info (FILE_SUPPORTS_SPARSE_FILES) on the share
 997          * since Samba server doesn't set the flag on the share, yet
 998          * supports the set sparse FSCTL and returns sparse correctly
 999          * in the file attributes. If we fail setting sparse though we
1000          * mark that server does not support sparse files for this share
1001          * to avoid repeatedly sending the unsupported fsctl to server
1002          * if the file is repeatedly extended.
1003          */
1004         if (tcon->broken_sparse_sup)
1005                 return false;
1006
1007         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1008                         cfile->fid.volatile_fid, FSCTL_SET_SPARSE,
1009                         true /* is_fctl */, false /* use_ipc */,
1010                         &setsparse, 1, NULL, NULL);
1011         if (rc) {
1012                 tcon->broken_sparse_sup = true;
1013                 cifs_dbg(FYI, "set sparse rc = %d\n", rc);
1014                 return false;
1015         }
1016
1017         if (setsparse)
1018                 cifsi->cifsAttrs |= FILE_ATTRIBUTE_SPARSE_FILE;
1019         else
1020                 cifsi->cifsAttrs &= (~FILE_ATTRIBUTE_SPARSE_FILE);
1021
1022         return true;
1023 }
1024
1025 static int
1026 smb2_set_file_size(const unsigned int xid, struct cifs_tcon *tcon,
1027                    struct cifsFileInfo *cfile, __u64 size, bool set_alloc)
1028 {
1029         __le64 eof = cpu_to_le64(size);
1030         struct inode *inode;
1031
1032         /*
1033          * If extending file more than one page make sparse. Many Linux fs
1034          * make files sparse by default when extending via ftruncate
1035          */
1036         inode = d_inode(cfile->dentry);
1037
1038         if (!set_alloc && (size > inode->i_size + 8192)) {
1039                 __u8 set_sparse = 1;
1040
1041                 /* whether set sparse succeeds or not, extend the file */
1042                 smb2_set_sparse(xid, tcon, cfile, inode, set_sparse);
1043         }
1044
1045         return SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
1046                             cfile->fid.volatile_fid, cfile->pid, &eof, false);
1047 }
1048
1049 static int
1050 smb2_duplicate_extents(const unsigned int xid,
1051                         struct cifsFileInfo *srcfile,
1052                         struct cifsFileInfo *trgtfile, u64 src_off,
1053                         u64 len, u64 dest_off)
1054 {
1055         int rc;
1056         unsigned int ret_data_len;
1057         struct duplicate_extents_to_file dup_ext_buf;
1058         struct cifs_tcon *tcon = tlink_tcon(trgtfile->tlink);
1059
1060         /* server fileays advertise duplicate extent support with this flag */
1061         if ((le32_to_cpu(tcon->fsAttrInfo.Attributes) &
1062              FILE_SUPPORTS_BLOCK_REFCOUNTING) == 0)
1063                 return -EOPNOTSUPP;
1064
1065         dup_ext_buf.VolatileFileHandle = srcfile->fid.volatile_fid;
1066         dup_ext_buf.PersistentFileHandle = srcfile->fid.persistent_fid;
1067         dup_ext_buf.SourceFileOffset = cpu_to_le64(src_off);
1068         dup_ext_buf.TargetFileOffset = cpu_to_le64(dest_off);
1069         dup_ext_buf.ByteCount = cpu_to_le64(len);
1070         cifs_dbg(FYI, "duplicate extents: src off %lld dst off %lld len %lld",
1071                 src_off, dest_off, len);
1072
1073         rc = smb2_set_file_size(xid, tcon, trgtfile, dest_off + len, false);
1074         if (rc)
1075                 goto duplicate_extents_out;
1076
1077         rc = SMB2_ioctl(xid, tcon, trgtfile->fid.persistent_fid,
1078                         trgtfile->fid.volatile_fid,
1079                         FSCTL_DUPLICATE_EXTENTS_TO_FILE,
1080                         true /* is_fsctl */, false /* use_ipc */,
1081                         (char *)&dup_ext_buf,
1082                         sizeof(struct duplicate_extents_to_file),
1083                         NULL,
1084                         &ret_data_len);
1085
1086         if (ret_data_len > 0)
1087                 cifs_dbg(FYI, "non-zero response length in duplicate extents");
1088
1089 duplicate_extents_out:
1090         return rc;
1091 }
1092
1093 static int
1094 smb2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1095                    struct cifsFileInfo *cfile)
1096 {
1097         return SMB2_set_compression(xid, tcon, cfile->fid.persistent_fid,
1098                             cfile->fid.volatile_fid);
1099 }
1100
1101 static int
1102 smb3_set_integrity(const unsigned int xid, struct cifs_tcon *tcon,
1103                    struct cifsFileInfo *cfile)
1104 {
1105         struct fsctl_set_integrity_information_req integr_info;
1106         unsigned int ret_data_len;
1107
1108         integr_info.ChecksumAlgorithm = cpu_to_le16(CHECKSUM_TYPE_UNCHANGED);
1109         integr_info.Flags = 0;
1110         integr_info.Reserved = 0;
1111
1112         return SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1113                         cfile->fid.volatile_fid,
1114                         FSCTL_SET_INTEGRITY_INFORMATION,
1115                         true /* is_fsctl */, false /* use_ipc */,
1116                         (char *)&integr_info,
1117                         sizeof(struct fsctl_set_integrity_information_req),
1118                         NULL,
1119                         &ret_data_len);
1120
1121 }
1122
1123 static int
1124 smb3_enum_snapshots(const unsigned int xid, struct cifs_tcon *tcon,
1125                    struct cifsFileInfo *cfile, void __user *ioc_buf)
1126 {
1127         char *retbuf = NULL;
1128         unsigned int ret_data_len = 0;
1129         int rc;
1130         struct smb_snapshot_array snapshot_in;
1131
1132         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1133                         cfile->fid.volatile_fid,
1134                         FSCTL_SRV_ENUMERATE_SNAPSHOTS,
1135                         true /* is_fsctl */, false /* use_ipc */,
1136                         NULL, 0 /* no input data */,
1137                         (char **)&retbuf,
1138                         &ret_data_len);
1139         cifs_dbg(FYI, "enum snaphots ioctl returned %d and ret buflen is %d\n",
1140                         rc, ret_data_len);
1141         if (rc)
1142                 return rc;
1143
1144         if (ret_data_len && (ioc_buf != NULL) && (retbuf != NULL)) {
1145                 /* Fixup buffer */
1146                 if (copy_from_user(&snapshot_in, ioc_buf,
1147                     sizeof(struct smb_snapshot_array))) {
1148                         rc = -EFAULT;
1149                         kfree(retbuf);
1150                         return rc;
1151                 }
1152                 if (snapshot_in.snapshot_array_size < sizeof(struct smb_snapshot_array)) {
1153                         rc = -ERANGE;
1154                         kfree(retbuf);
1155                         return rc;
1156                 }
1157
1158                 if (ret_data_len > snapshot_in.snapshot_array_size)
1159                         ret_data_len = snapshot_in.snapshot_array_size;
1160
1161                 if (copy_to_user(ioc_buf, retbuf, ret_data_len))
1162                         rc = -EFAULT;
1163         }
1164
1165         kfree(retbuf);
1166         return rc;
1167 }
1168
1169 static int
1170 smb2_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,
1171                      const char *path, struct cifs_sb_info *cifs_sb,
1172                      struct cifs_fid *fid, __u16 search_flags,
1173                      struct cifs_search_info *srch_inf)
1174 {
1175         __le16 *utf16_path;
1176         int rc;
1177         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1178         struct cifs_open_parms oparms;
1179
1180         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1181         if (!utf16_path)
1182                 return -ENOMEM;
1183
1184         oparms.tcon = tcon;
1185         oparms.desired_access = FILE_READ_ATTRIBUTES | FILE_READ_DATA;
1186         oparms.disposition = FILE_OPEN;
1187         oparms.create_options = 0;
1188         oparms.fid = fid;
1189         oparms.reconnect = false;
1190
1191         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
1192         kfree(utf16_path);
1193         if (rc) {
1194                 cifs_dbg(FYI, "open dir failed rc=%d\n", rc);
1195                 return rc;
1196         }
1197
1198         srch_inf->entries_in_buffer = 0;
1199         srch_inf->index_of_last_entry = 0;
1200
1201         rc = SMB2_query_directory(xid, tcon, fid->persistent_fid,
1202                                   fid->volatile_fid, 0, srch_inf);
1203         if (rc) {
1204                 cifs_dbg(FYI, "query directory failed rc=%d\n", rc);
1205                 SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1206         }
1207         return rc;
1208 }
1209
1210 static int
1211 smb2_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,
1212                     struct cifs_fid *fid, __u16 search_flags,
1213                     struct cifs_search_info *srch_inf)
1214 {
1215         return SMB2_query_directory(xid, tcon, fid->persistent_fid,
1216                                     fid->volatile_fid, 0, srch_inf);
1217 }
1218
1219 static int
1220 smb2_close_dir(const unsigned int xid, struct cifs_tcon *tcon,
1221                struct cifs_fid *fid)
1222 {
1223         return SMB2_close(xid, tcon, fid->persistent_fid, fid->volatile_fid);
1224 }
1225
1226 /*
1227 * If we negotiate SMB2 protocol and get STATUS_PENDING - update
1228 * the number of credits and return true. Otherwise - return false.
1229 */
1230 static bool
1231 smb2_is_status_pending(char *buf, struct TCP_Server_Info *server, int length)
1232 {
1233         struct smb2_sync_hdr *shdr = get_sync_hdr(buf);
1234
1235         if (shdr->Status != STATUS_PENDING)
1236                 return false;
1237
1238         if (!length) {
1239                 spin_lock(&server->req_lock);
1240                 server->credits += le16_to_cpu(shdr->CreditRequest);
1241                 spin_unlock(&server->req_lock);
1242                 wake_up(&server->request_q);
1243         }
1244
1245         return true;
1246 }
1247
1248 static bool
1249 smb2_is_session_expired(char *buf)
1250 {
1251         struct smb2_sync_hdr *shdr = get_sync_hdr(buf);
1252
1253         if (shdr->Status != STATUS_NETWORK_SESSION_EXPIRED)
1254                 return false;
1255
1256         cifs_dbg(FYI, "Session expired\n");
1257         return true;
1258 }
1259
1260 static int
1261 smb2_oplock_response(struct cifs_tcon *tcon, struct cifs_fid *fid,
1262                      struct cifsInodeInfo *cinode)
1263 {
1264         if (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING)
1265                 return SMB2_lease_break(0, tcon, cinode->lease_key,
1266                                         smb2_get_lease_state(cinode));
1267
1268         return SMB2_oplock_break(0, tcon, fid->persistent_fid,
1269                                  fid->volatile_fid,
1270                                  CIFS_CACHE_READ(cinode) ? 1 : 0);
1271 }
1272
1273 static int
1274 smb2_queryfs(const unsigned int xid, struct cifs_tcon *tcon,
1275              struct kstatfs *buf)
1276 {
1277         int rc;
1278         __le16 srch_path = 0; /* Null - open root of share */
1279         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1280         struct cifs_open_parms oparms;
1281         struct cifs_fid fid;
1282
1283         oparms.tcon = tcon;
1284         oparms.desired_access = FILE_READ_ATTRIBUTES;
1285         oparms.disposition = FILE_OPEN;
1286         oparms.create_options = 0;
1287         oparms.fid = &fid;
1288         oparms.reconnect = false;
1289
1290         rc = SMB2_open(xid, &oparms, &srch_path, &oplock, NULL, NULL);
1291         if (rc)
1292                 return rc;
1293         buf->f_type = SMB2_MAGIC_NUMBER;
1294         rc = SMB2_QFS_info(xid, tcon, fid.persistent_fid, fid.volatile_fid,
1295                            buf);
1296         SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
1297         return rc;
1298 }
1299
1300 static bool
1301 smb2_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
1302 {
1303         return ob1->fid.persistent_fid == ob2->fid.persistent_fid &&
1304                ob1->fid.volatile_fid == ob2->fid.volatile_fid;
1305 }
1306
1307 static int
1308 smb2_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
1309                __u64 length, __u32 type, int lock, int unlock, bool wait)
1310 {
1311         if (unlock && !lock)
1312                 type = SMB2_LOCKFLAG_UNLOCK;
1313         return SMB2_lock(xid, tlink_tcon(cfile->tlink),
1314                          cfile->fid.persistent_fid, cfile->fid.volatile_fid,
1315                          current->tgid, length, offset, type, wait);
1316 }
1317
1318 static void
1319 smb2_get_lease_key(struct inode *inode, struct cifs_fid *fid)
1320 {
1321         memcpy(fid->lease_key, CIFS_I(inode)->lease_key, SMB2_LEASE_KEY_SIZE);
1322 }
1323
1324 static void
1325 smb2_set_lease_key(struct inode *inode, struct cifs_fid *fid)
1326 {
1327         memcpy(CIFS_I(inode)->lease_key, fid->lease_key, SMB2_LEASE_KEY_SIZE);
1328 }
1329
1330 static void
1331 smb2_new_lease_key(struct cifs_fid *fid)
1332 {
1333         generate_random_uuid(fid->lease_key);
1334 }
1335
1336 static int
1337 smb2_get_dfs_refer(const unsigned int xid, struct cifs_ses *ses,
1338                    const char *search_name,
1339                    struct dfs_info3_param **target_nodes,
1340                    unsigned int *num_of_nodes,
1341                    const struct nls_table *nls_codepage, int remap)
1342 {
1343         int rc;
1344         __le16 *utf16_path = NULL;
1345         int utf16_path_len = 0;
1346         struct cifs_tcon *tcon;
1347         struct fsctl_get_dfs_referral_req *dfs_req = NULL;
1348         struct get_dfs_referral_rsp *dfs_rsp = NULL;
1349         u32 dfs_req_size = 0, dfs_rsp_size = 0;
1350
1351         cifs_dbg(FYI, "smb2_get_dfs_refer path <%s>\n", search_name);
1352
1353         /*
1354          * Use any tcon from the current session. Here, the first one.
1355          */
1356         spin_lock(&cifs_tcp_ses_lock);
1357         tcon = list_first_entry_or_null(&ses->tcon_list, struct cifs_tcon,
1358                                         tcon_list);
1359         if (tcon)
1360                 tcon->tc_count++;
1361         spin_unlock(&cifs_tcp_ses_lock);
1362
1363         if (!tcon) {
1364                 cifs_dbg(VFS, "session %p has no tcon available for a dfs referral request\n",
1365                          ses);
1366                 rc = -ENOTCONN;
1367                 goto out;
1368         }
1369
1370         utf16_path = cifs_strndup_to_utf16(search_name, PATH_MAX,
1371                                            &utf16_path_len,
1372                                            nls_codepage, remap);
1373         if (!utf16_path) {
1374                 rc = -ENOMEM;
1375                 goto out;
1376         }
1377
1378         dfs_req_size = sizeof(*dfs_req) + utf16_path_len;
1379         dfs_req = kzalloc(dfs_req_size, GFP_KERNEL);
1380         if (!dfs_req) {
1381                 rc = -ENOMEM;
1382                 goto out;
1383         }
1384
1385         /* Highest DFS referral version understood */
1386         dfs_req->MaxReferralLevel = DFS_VERSION;
1387
1388         /* Path to resolve in an UTF-16 null-terminated string */
1389         memcpy(dfs_req->RequestFileName, utf16_path, utf16_path_len);
1390
1391         do {
1392                 /* try first with IPC */
1393                 rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1394                                 FSCTL_DFS_GET_REFERRALS,
1395                                 true /* is_fsctl */, true /* use_ipc */,
1396                                 (char *)dfs_req, dfs_req_size,
1397                                 (char **)&dfs_rsp, &dfs_rsp_size);
1398                 if (rc == -ENOTCONN) {
1399                         /* try with normal tcon */
1400                         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1401                                         FSCTL_DFS_GET_REFERRALS,
1402                                         true /* is_fsctl */, false /*use_ipc*/,
1403                                         (char *)dfs_req, dfs_req_size,
1404                                         (char **)&dfs_rsp, &dfs_rsp_size);
1405                 }
1406         } while (rc == -EAGAIN);
1407
1408         if (rc) {
1409                 if (rc != -ENOENT)
1410                         cifs_dbg(VFS, "ioctl error in smb2_get_dfs_refer rc=%d\n", rc);
1411                 goto out;
1412         }
1413
1414         rc = parse_dfs_referrals(dfs_rsp, dfs_rsp_size,
1415                                  num_of_nodes, target_nodes,
1416                                  nls_codepage, remap, search_name,
1417                                  true /* is_unicode */);
1418         if (rc) {
1419                 cifs_dbg(VFS, "parse error in smb2_get_dfs_refer rc=%d\n", rc);
1420                 goto out;
1421         }
1422
1423  out:
1424         if (tcon) {
1425                 spin_lock(&cifs_tcp_ses_lock);
1426                 tcon->tc_count--;
1427                 spin_unlock(&cifs_tcp_ses_lock);
1428         }
1429         kfree(utf16_path);
1430         kfree(dfs_req);
1431         kfree(dfs_rsp);
1432         return rc;
1433 }
1434 #define SMB2_SYMLINK_STRUCT_SIZE \
1435         (sizeof(struct smb2_err_rsp) - 1 + sizeof(struct smb2_symlink_err_rsp))
1436
1437 static int
1438 smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
1439                    const char *full_path, char **target_path,
1440                    struct cifs_sb_info *cifs_sb)
1441 {
1442         int rc;
1443         __le16 *utf16_path;
1444         __u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1445         struct cifs_open_parms oparms;
1446         struct cifs_fid fid;
1447         struct smb2_err_rsp *err_buf = NULL;
1448         struct smb2_symlink_err_rsp *symlink;
1449         unsigned int sub_len;
1450         unsigned int sub_offset;
1451         unsigned int print_len;
1452         unsigned int print_offset;
1453
1454         cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path);
1455
1456         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
1457         if (!utf16_path)
1458                 return -ENOMEM;
1459
1460         oparms.tcon = tcon;
1461         oparms.desired_access = FILE_READ_ATTRIBUTES;
1462         oparms.disposition = FILE_OPEN;
1463         oparms.create_options = 0;
1464         oparms.fid = &fid;
1465         oparms.reconnect = false;
1466
1467         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, &err_buf);
1468
1469         if (!rc || !err_buf) {
1470                 kfree(utf16_path);
1471                 return -ENOENT;
1472         }
1473
1474         if (le32_to_cpu(err_buf->ByteCount) < sizeof(struct smb2_symlink_err_rsp) ||
1475             get_rfc1002_length(err_buf) + 4 < SMB2_SYMLINK_STRUCT_SIZE) {
1476                 kfree(utf16_path);
1477                 return -ENOENT;
1478         }
1479
1480         /* open must fail on symlink - reset rc */
1481         rc = 0;
1482         symlink = (struct smb2_symlink_err_rsp *)err_buf->ErrorData;
1483         sub_len = le16_to_cpu(symlink->SubstituteNameLength);
1484         sub_offset = le16_to_cpu(symlink->SubstituteNameOffset);
1485         print_len = le16_to_cpu(symlink->PrintNameLength);
1486         print_offset = le16_to_cpu(symlink->PrintNameOffset);
1487
1488         if (get_rfc1002_length(err_buf) + 4 <
1489                         SMB2_SYMLINK_STRUCT_SIZE + sub_offset + sub_len) {
1490                 kfree(utf16_path);
1491                 return -ENOENT;
1492         }
1493
1494         if (get_rfc1002_length(err_buf) + 4 <
1495                         SMB2_SYMLINK_STRUCT_SIZE + print_offset + print_len) {
1496                 kfree(utf16_path);
1497                 return -ENOENT;
1498         }
1499
1500         *target_path = cifs_strndup_from_utf16(
1501                                 (char *)symlink->PathBuffer + sub_offset,
1502                                 sub_len, true, cifs_sb->local_nls);
1503         if (!(*target_path)) {
1504                 kfree(utf16_path);
1505                 return -ENOMEM;
1506         }
1507         convert_delimiter(*target_path, '/');
1508         cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path);
1509         kfree(utf16_path);
1510         return rc;
1511 }
1512
1513 #ifdef CONFIG_CIFS_ACL
1514 static struct cifs_ntsd *
1515 get_smb2_acl_by_fid(struct cifs_sb_info *cifs_sb,
1516                 const struct cifs_fid *cifsfid, u32 *pacllen)
1517 {
1518         struct cifs_ntsd *pntsd = NULL;
1519         unsigned int xid;
1520         int rc = -EOPNOTSUPP;
1521         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
1522
1523         if (IS_ERR(tlink))
1524                 return ERR_CAST(tlink);
1525
1526         xid = get_xid();
1527         cifs_dbg(FYI, "trying to get acl\n");
1528
1529         rc = SMB2_query_acl(xid, tlink_tcon(tlink), cifsfid->persistent_fid,
1530                             cifsfid->volatile_fid, (void **)&pntsd, pacllen);
1531         free_xid(xid);
1532
1533         cifs_put_tlink(tlink);
1534
1535         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
1536         if (rc)
1537                 return ERR_PTR(rc);
1538         return pntsd;
1539
1540 }
1541
1542 static struct cifs_ntsd *
1543 get_smb2_acl_by_path(struct cifs_sb_info *cifs_sb,
1544                 const char *path, u32 *pacllen)
1545 {
1546         struct cifs_ntsd *pntsd = NULL;
1547         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1548         unsigned int xid;
1549         int rc;
1550         struct cifs_tcon *tcon;
1551         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
1552         struct cifs_fid fid;
1553         struct cifs_open_parms oparms;
1554         __le16 *utf16_path;
1555
1556         cifs_dbg(FYI, "get smb3 acl for path %s\n", path);
1557         if (IS_ERR(tlink))
1558                 return ERR_CAST(tlink);
1559
1560         tcon = tlink_tcon(tlink);
1561         xid = get_xid();
1562
1563         if (backup_cred(cifs_sb))
1564                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
1565         else
1566                 oparms.create_options = 0;
1567
1568         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1569         if (!utf16_path)
1570                 return ERR_PTR(-ENOMEM);
1571
1572         oparms.tcon = tcon;
1573         oparms.desired_access = READ_CONTROL;
1574         oparms.disposition = FILE_OPEN;
1575         oparms.fid = &fid;
1576         oparms.reconnect = false;
1577
1578         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
1579         kfree(utf16_path);
1580         if (!rc) {
1581                 rc = SMB2_query_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
1582                             fid.volatile_fid, (void **)&pntsd, pacllen);
1583                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
1584         }
1585
1586         cifs_put_tlink(tlink);
1587         free_xid(xid);
1588
1589         cifs_dbg(FYI, "%s: rc = %d ACL len %d\n", __func__, rc, *pacllen);
1590         if (rc)
1591                 return ERR_PTR(rc);
1592         return pntsd;
1593 }
1594
1595 #ifdef CONFIG_CIFS_ACL
1596 static int
1597 set_smb2_acl(struct cifs_ntsd *pnntsd, __u32 acllen,
1598                 struct inode *inode, const char *path, int aclflag)
1599 {
1600         u8 oplock = SMB2_OPLOCK_LEVEL_NONE;
1601         unsigned int xid;
1602         int rc, access_flags = 0;
1603         struct cifs_tcon *tcon;
1604         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
1605         struct tcon_link *tlink = cifs_sb_tlink(cifs_sb);
1606         struct cifs_fid fid;
1607         struct cifs_open_parms oparms;
1608         __le16 *utf16_path;
1609
1610         cifs_dbg(FYI, "set smb3 acl for path %s\n", path);
1611         if (IS_ERR(tlink))
1612                 return PTR_ERR(tlink);
1613
1614         tcon = tlink_tcon(tlink);
1615         xid = get_xid();
1616
1617         if (backup_cred(cifs_sb))
1618                 oparms.create_options = CREATE_OPEN_BACKUP_INTENT;
1619         else
1620                 oparms.create_options = 0;
1621
1622         if (aclflag == CIFS_ACL_OWNER || aclflag == CIFS_ACL_GROUP)
1623                 access_flags = WRITE_OWNER;
1624         else
1625                 access_flags = WRITE_DAC;
1626
1627         utf16_path = cifs_convert_path_to_utf16(path, cifs_sb);
1628         if (!utf16_path)
1629                 return -ENOMEM;
1630
1631         oparms.tcon = tcon;
1632         oparms.desired_access = access_flags;
1633         oparms.disposition = FILE_OPEN;
1634         oparms.path = path;
1635         oparms.fid = &fid;
1636         oparms.reconnect = false;
1637
1638         rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL);
1639         kfree(utf16_path);
1640         if (!rc) {
1641                 rc = SMB2_set_acl(xid, tlink_tcon(tlink), fid.persistent_fid,
1642                             fid.volatile_fid, pnntsd, acllen, aclflag);
1643                 SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid);
1644         }
1645
1646         cifs_put_tlink(tlink);
1647         free_xid(xid);
1648         return rc;
1649 }
1650 #endif /* CIFS_ACL */
1651
1652 /* Retrieve an ACL from the server */
1653 static struct cifs_ntsd *
1654 get_smb2_acl(struct cifs_sb_info *cifs_sb,
1655                                       struct inode *inode, const char *path,
1656                                       u32 *pacllen)
1657 {
1658         struct cifs_ntsd *pntsd = NULL;
1659         struct cifsFileInfo *open_file = NULL;
1660
1661         if (inode)
1662                 open_file = find_readable_file(CIFS_I(inode), true);
1663         if (!open_file)
1664                 return get_smb2_acl_by_path(cifs_sb, path, pacllen);
1665
1666         pntsd = get_smb2_acl_by_fid(cifs_sb, &open_file->fid, pacllen);
1667         cifsFileInfo_put(open_file);
1668         return pntsd;
1669 }
1670 #endif
1671
1672 static long smb3_zero_range(struct file *file, struct cifs_tcon *tcon,
1673                             loff_t offset, loff_t len, bool keep_size)
1674 {
1675         struct inode *inode;
1676         struct cifsInodeInfo *cifsi;
1677         struct cifsFileInfo *cfile = file->private_data;
1678         struct file_zero_data_information fsctl_buf;
1679         long rc;
1680         unsigned int xid;
1681
1682         xid = get_xid();
1683
1684         inode = d_inode(cfile->dentry);
1685         cifsi = CIFS_I(inode);
1686
1687         /* if file not oplocked can't be sure whether asking to extend size */
1688         if (!CIFS_CACHE_READ(cifsi))
1689                 if (keep_size == false)
1690                         return -EOPNOTSUPP;
1691
1692         /*
1693          * Must check if file sparse since fallocate -z (zero range) assumes
1694          * non-sparse allocation
1695          */
1696         if (!(cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE))
1697                 return -EOPNOTSUPP;
1698
1699         /*
1700          * need to make sure we are not asked to extend the file since the SMB3
1701          * fsctl does not change the file size. In the future we could change
1702          * this to zero the first part of the range then set the file size
1703          * which for a non sparse file would zero the newly extended range
1704          */
1705         if (keep_size == false)
1706                 if (i_size_read(inode) < offset + len)
1707                         return -EOPNOTSUPP;
1708
1709         cifs_dbg(FYI, "offset %lld len %lld", offset, len);
1710
1711         fsctl_buf.FileOffset = cpu_to_le64(offset);
1712         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
1713
1714         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1715                         cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
1716                         true /* is_fctl */, false /* use_ipc */,
1717                         (char *)&fsctl_buf,
1718                         sizeof(struct file_zero_data_information), NULL, NULL);
1719         free_xid(xid);
1720         return rc;
1721 }
1722
1723 static long smb3_punch_hole(struct file *file, struct cifs_tcon *tcon,
1724                             loff_t offset, loff_t len)
1725 {
1726         struct inode *inode;
1727         struct cifsInodeInfo *cifsi;
1728         struct cifsFileInfo *cfile = file->private_data;
1729         struct file_zero_data_information fsctl_buf;
1730         long rc;
1731         unsigned int xid;
1732         __u8 set_sparse = 1;
1733
1734         xid = get_xid();
1735
1736         inode = d_inode(cfile->dentry);
1737         cifsi = CIFS_I(inode);
1738
1739         /* Need to make file sparse, if not already, before freeing range. */
1740         /* Consider adding equivalent for compressed since it could also work */
1741         if (!smb2_set_sparse(xid, tcon, cfile, inode, set_sparse))
1742                 return -EOPNOTSUPP;
1743
1744         cifs_dbg(FYI, "offset %lld len %lld", offset, len);
1745
1746         fsctl_buf.FileOffset = cpu_to_le64(offset);
1747         fsctl_buf.BeyondFinalZero = cpu_to_le64(offset + len);
1748
1749         rc = SMB2_ioctl(xid, tcon, cfile->fid.persistent_fid,
1750                         cfile->fid.volatile_fid, FSCTL_SET_ZERO_DATA,
1751                         true /* is_fctl */, false /* use_ipc */,
1752                         (char *)&fsctl_buf,
1753                         sizeof(struct file_zero_data_information), NULL, NULL);
1754         free_xid(xid);
1755         return rc;
1756 }
1757
1758 static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon,
1759                             loff_t off, loff_t len, bool keep_size)
1760 {
1761         struct inode *inode;
1762         struct cifsInodeInfo *cifsi;
1763         struct cifsFileInfo *cfile = file->private_data;
1764         long rc = -EOPNOTSUPP;
1765         unsigned int xid;
1766
1767         xid = get_xid();
1768
1769         inode = d_inode(cfile->dentry);
1770         cifsi = CIFS_I(inode);
1771
1772         /* if file not oplocked can't be sure whether asking to extend size */
1773         if (!CIFS_CACHE_READ(cifsi))
1774                 if (keep_size == false)
1775                         return -EOPNOTSUPP;
1776
1777         /*
1778          * Files are non-sparse by default so falloc may be a no-op
1779          * Must check if file sparse. If not sparse, and not extending
1780          * then no need to do anything since file already allocated
1781          */
1782         if ((cifsi->cifsAttrs & FILE_ATTRIBUTE_SPARSE_FILE) == 0) {
1783                 if (keep_size == true)
1784                         return 0;
1785                 /* check if extending file */
1786                 else if (i_size_read(inode) >= off + len)
1787                         /* not extending file and already not sparse */
1788                         return 0;
1789                 /* BB: in future add else clause to extend file */
1790                 else
1791                         return -EOPNOTSUPP;
1792         }
1793
1794         if ((keep_size == true) || (i_size_read(inode) >= off + len)) {
1795                 /*
1796                  * Check if falloc starts within first few pages of file
1797                  * and ends within a few pages of the end of file to
1798                  * ensure that most of file is being forced to be
1799                  * fallocated now. If so then setting whole file sparse
1800                  * ie potentially making a few extra pages at the beginning
1801                  * or end of the file non-sparse via set_sparse is harmless.
1802                  */
1803                 if ((off > 8192) || (off + len + 8192 < i_size_read(inode)))
1804                         return -EOPNOTSUPP;
1805
1806                 rc = smb2_set_sparse(xid, tcon, cfile, inode, false);
1807         }
1808         /* BB: else ... in future add code to extend file and set sparse */
1809
1810
1811         free_xid(xid);
1812         return rc;
1813 }
1814
1815
1816 static long smb3_fallocate(struct file *file, struct cifs_tcon *tcon, int mode,
1817                            loff_t off, loff_t len)
1818 {
1819         /* KEEP_SIZE already checked for by do_fallocate */
1820         if (mode & FALLOC_FL_PUNCH_HOLE)
1821                 return smb3_punch_hole(file, tcon, off, len);
1822         else if (mode & FALLOC_FL_ZERO_RANGE) {
1823                 if (mode & FALLOC_FL_KEEP_SIZE)
1824                         return smb3_zero_range(file, tcon, off, len, true);
1825                 return smb3_zero_range(file, tcon, off, len, false);
1826         } else if (mode == FALLOC_FL_KEEP_SIZE)
1827                 return smb3_simple_falloc(file, tcon, off, len, true);
1828         else if (mode == 0)
1829                 return smb3_simple_falloc(file, tcon, off, len, false);
1830
1831         return -EOPNOTSUPP;
1832 }
1833
1834 static void
1835 smb2_downgrade_oplock(struct TCP_Server_Info *server,
1836                         struct cifsInodeInfo *cinode, bool set_level2)
1837 {
1838         if (set_level2)
1839                 server->ops->set_oplock_level(cinode, SMB2_OPLOCK_LEVEL_II,
1840                                                 0, NULL);
1841         else
1842                 server->ops->set_oplock_level(cinode, 0, 0, NULL);
1843 }
1844
1845 static void
1846 smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
1847                       unsigned int epoch, bool *purge_cache)
1848 {
1849         oplock &= 0xFF;
1850         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
1851                 return;
1852         if (oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1853                 cinode->oplock = CIFS_CACHE_RHW_FLG;
1854                 cifs_dbg(FYI, "Batch Oplock granted on inode %p\n",
1855                          &cinode->vfs_inode);
1856         } else if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
1857                 cinode->oplock = CIFS_CACHE_RW_FLG;
1858                 cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
1859                          &cinode->vfs_inode);
1860         } else if (oplock == SMB2_OPLOCK_LEVEL_II) {
1861                 cinode->oplock = CIFS_CACHE_READ_FLG;
1862                 cifs_dbg(FYI, "Level II Oplock granted on inode %p\n",
1863                          &cinode->vfs_inode);
1864         } else
1865                 cinode->oplock = 0;
1866 }
1867
1868 static void
1869 smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
1870                        unsigned int epoch, bool *purge_cache)
1871 {
1872         char message[5] = {0};
1873
1874         oplock &= 0xFF;
1875         if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
1876                 return;
1877
1878         cinode->oplock = 0;
1879         if (oplock & SMB2_LEASE_READ_CACHING_HE) {
1880                 cinode->oplock |= CIFS_CACHE_READ_FLG;
1881                 strcat(message, "R");
1882         }
1883         if (oplock & SMB2_LEASE_HANDLE_CACHING_HE) {
1884                 cinode->oplock |= CIFS_CACHE_HANDLE_FLG;
1885                 strcat(message, "H");
1886         }
1887         if (oplock & SMB2_LEASE_WRITE_CACHING_HE) {
1888                 cinode->oplock |= CIFS_CACHE_WRITE_FLG;
1889                 strcat(message, "W");
1890         }
1891         if (!cinode->oplock)
1892                 strcat(message, "None");
1893         cifs_dbg(FYI, "%s Lease granted on inode %p\n", message,
1894                  &cinode->vfs_inode);
1895 }
1896
1897 static void
1898 smb3_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
1899                       unsigned int epoch, bool *purge_cache)
1900 {
1901         unsigned int old_oplock = cinode->oplock;
1902
1903         smb21_set_oplock_level(cinode, oplock, epoch, purge_cache);
1904
1905         if (purge_cache) {
1906                 *purge_cache = false;
1907                 if (old_oplock == CIFS_CACHE_READ_FLG) {
1908                         if (cinode->oplock == CIFS_CACHE_READ_FLG &&
1909                             (epoch - cinode->epoch > 0))
1910                                 *purge_cache = true;
1911                         else if (cinode->oplock == CIFS_CACHE_RH_FLG &&
1912                                  (epoch - cinode->epoch > 1))
1913                                 *purge_cache = true;
1914                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
1915                                  (epoch - cinode->epoch > 1))
1916                                 *purge_cache = true;
1917                         else if (cinode->oplock == 0 &&
1918                                  (epoch - cinode->epoch > 0))
1919                                 *purge_cache = true;
1920                 } else if (old_oplock == CIFS_CACHE_RH_FLG) {
1921                         if (cinode->oplock == CIFS_CACHE_RH_FLG &&
1922                             (epoch - cinode->epoch > 0))
1923                                 *purge_cache = true;
1924                         else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
1925                                  (epoch - cinode->epoch > 1))
1926                                 *purge_cache = true;
1927                 }
1928                 cinode->epoch = epoch;
1929         }
1930 }
1931
1932 static bool
1933 smb2_is_read_op(__u32 oplock)
1934 {
1935         return oplock == SMB2_OPLOCK_LEVEL_II;
1936 }
1937
1938 static bool
1939 smb21_is_read_op(__u32 oplock)
1940 {
1941         return (oplock & SMB2_LEASE_READ_CACHING_HE) &&
1942                !(oplock & SMB2_LEASE_WRITE_CACHING_HE);
1943 }
1944
1945 static __le32
1946 map_oplock_to_lease(u8 oplock)
1947 {
1948         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
1949                 return SMB2_LEASE_WRITE_CACHING | SMB2_LEASE_READ_CACHING;
1950         else if (oplock == SMB2_OPLOCK_LEVEL_II)
1951                 return SMB2_LEASE_READ_CACHING;
1952         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
1953                 return SMB2_LEASE_HANDLE_CACHING | SMB2_LEASE_READ_CACHING |
1954                        SMB2_LEASE_WRITE_CACHING;
1955         return 0;
1956 }
1957
1958 static char *
1959 smb2_create_lease_buf(u8 *lease_key, u8 oplock)
1960 {
1961         struct create_lease *buf;
1962
1963         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
1964         if (!buf)
1965                 return NULL;
1966
1967         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
1968         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
1969         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
1970
1971         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1972                                         (struct create_lease, lcontext));
1973         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
1974         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1975                                 (struct create_lease, Name));
1976         buf->ccontext.NameLength = cpu_to_le16(4);
1977         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
1978         buf->Name[0] = 'R';
1979         buf->Name[1] = 'q';
1980         buf->Name[2] = 'L';
1981         buf->Name[3] = 's';
1982         return (char *)buf;
1983 }
1984
1985 static char *
1986 smb3_create_lease_buf(u8 *lease_key, u8 oplock)
1987 {
1988         struct create_lease_v2 *buf;
1989
1990         buf = kzalloc(sizeof(struct create_lease_v2), GFP_KERNEL);
1991         if (!buf)
1992                 return NULL;
1993
1994         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
1995         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
1996         buf->lcontext.LeaseState = map_oplock_to_lease(oplock);
1997
1998         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1999                                         (struct create_lease_v2, lcontext));
2000         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context_v2));
2001         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2002                                 (struct create_lease_v2, Name));
2003         buf->ccontext.NameLength = cpu_to_le16(4);
2004         /* SMB2_CREATE_REQUEST_LEASE is "RqLs" */
2005         buf->Name[0] = 'R';
2006         buf->Name[1] = 'q';
2007         buf->Name[2] = 'L';
2008         buf->Name[3] = 's';
2009         return (char *)buf;
2010 }
2011
2012 static __u8
2013 smb2_parse_lease_buf(void *buf, unsigned int *epoch)
2014 {
2015         struct create_lease *lc = (struct create_lease *)buf;
2016
2017         *epoch = 0; /* not used */
2018         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
2019                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
2020         return le32_to_cpu(lc->lcontext.LeaseState);
2021 }
2022
2023 static __u8
2024 smb3_parse_lease_buf(void *buf, unsigned int *epoch)
2025 {
2026         struct create_lease_v2 *lc = (struct create_lease_v2 *)buf;
2027
2028         *epoch = le16_to_cpu(lc->lcontext.Epoch);
2029         if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
2030                 return SMB2_OPLOCK_LEVEL_NOCHANGE;
2031         return le32_to_cpu(lc->lcontext.LeaseState);
2032 }
2033
2034 static unsigned int
2035 smb2_wp_retry_size(struct inode *inode)
2036 {
2037         return min_t(unsigned int, CIFS_SB(inode->i_sb)->wsize,
2038                      SMB2_MAX_BUFFER_SIZE);
2039 }
2040
2041 static bool
2042 smb2_dir_needs_close(struct cifsFileInfo *cfile)
2043 {
2044         return !cfile->invalidHandle;
2045 }
2046
2047 static void
2048 fill_transform_hdr(struct smb2_transform_hdr *tr_hdr, struct smb_rqst *old_rq)
2049 {
2050         struct smb2_sync_hdr *shdr =
2051                         (struct smb2_sync_hdr *)old_rq->rq_iov[1].iov_base;
2052         unsigned int orig_len = get_rfc1002_length(old_rq->rq_iov[0].iov_base);
2053
2054         memset(tr_hdr, 0, sizeof(struct smb2_transform_hdr));
2055         tr_hdr->ProtocolId = SMB2_TRANSFORM_PROTO_NUM;
2056         tr_hdr->OriginalMessageSize = cpu_to_le32(orig_len);
2057         tr_hdr->Flags = cpu_to_le16(0x01);
2058         get_random_bytes(&tr_hdr->Nonce, SMB3_AES128CMM_NONCE);
2059         memcpy(&tr_hdr->SessionId, &shdr->SessionId, 8);
2060         inc_rfc1001_len(tr_hdr, sizeof(struct smb2_transform_hdr) - 4);
2061         inc_rfc1001_len(tr_hdr, orig_len);
2062 }
2063
2064 static struct scatterlist *
2065 init_sg(struct smb_rqst *rqst, u8 *sign)
2066 {
2067         unsigned int sg_len = rqst->rq_nvec + rqst->rq_npages + 1;
2068         unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 24;
2069         struct scatterlist *sg;
2070         unsigned int i;
2071         unsigned int j;
2072
2073         sg = kmalloc_array(sg_len, sizeof(struct scatterlist), GFP_KERNEL);
2074         if (!sg)
2075                 return NULL;
2076
2077         sg_init_table(sg, sg_len);
2078         sg_set_buf(&sg[0], rqst->rq_iov[0].iov_base + 24, assoc_data_len);
2079         for (i = 1; i < rqst->rq_nvec; i++)
2080                 sg_set_buf(&sg[i], rqst->rq_iov[i].iov_base,
2081                                                 rqst->rq_iov[i].iov_len);
2082         for (j = 0; i < sg_len - 1; i++, j++) {
2083                 unsigned int len = (j < rqst->rq_npages - 1) ? rqst->rq_pagesz
2084                                                         : rqst->rq_tailsz;
2085                 sg_set_page(&sg[i], rqst->rq_pages[j], len, 0);
2086         }
2087         sg_set_buf(&sg[sg_len - 1], sign, SMB2_SIGNATURE_SIZE);
2088         return sg;
2089 }
2090
2091 static int
2092 smb2_get_enc_key(struct TCP_Server_Info *server, __u64 ses_id, int enc, u8 *key)
2093 {
2094         struct cifs_ses *ses;
2095         u8 *ses_enc_key;
2096
2097         spin_lock(&cifs_tcp_ses_lock);
2098         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2099                 if (ses->Suid != ses_id)
2100                         continue;
2101                 ses_enc_key = enc ? ses->smb3encryptionkey :
2102                                                         ses->smb3decryptionkey;
2103                 memcpy(key, ses_enc_key, SMB3_SIGN_KEY_SIZE);
2104                 spin_unlock(&cifs_tcp_ses_lock);
2105                 return 0;
2106         }
2107         spin_unlock(&cifs_tcp_ses_lock);
2108
2109         return 1;
2110 }
2111 /*
2112  * Encrypt or decrypt @rqst message. @rqst has the following format:
2113  * iov[0] - transform header (associate data),
2114  * iov[1-N] and pages - data to encrypt.
2115  * On success return encrypted data in iov[1-N] and pages, leave iov[0]
2116  * untouched.
2117  */
2118 static int
2119 crypt_message(struct TCP_Server_Info *server, struct smb_rqst *rqst, int enc)
2120 {
2121         struct smb2_transform_hdr *tr_hdr =
2122                         (struct smb2_transform_hdr *)rqst->rq_iov[0].iov_base;
2123         unsigned int assoc_data_len = sizeof(struct smb2_transform_hdr) - 24;
2124         int rc = 0;
2125         struct scatterlist *sg;
2126         u8 sign[SMB2_SIGNATURE_SIZE] = {};
2127         u8 key[SMB3_SIGN_KEY_SIZE];
2128         struct aead_request *req;
2129         char *iv;
2130         unsigned int iv_len;
2131         DECLARE_CRYPTO_WAIT(wait);
2132         struct crypto_aead *tfm;
2133         unsigned int crypt_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
2134
2135         rc = smb2_get_enc_key(server, tr_hdr->SessionId, enc, key);
2136         if (rc) {
2137                 cifs_dbg(VFS, "%s: Could not get %scryption key\n", __func__,
2138                          enc ? "en" : "de");
2139                 return 0;
2140         }
2141
2142         rc = smb3_crypto_aead_allocate(server);
2143         if (rc) {
2144                 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
2145                 return rc;
2146         }
2147
2148         tfm = enc ? server->secmech.ccmaesencrypt :
2149                                                 server->secmech.ccmaesdecrypt;
2150         rc = crypto_aead_setkey(tfm, key, SMB3_SIGN_KEY_SIZE);
2151         if (rc) {
2152                 cifs_dbg(VFS, "%s: Failed to set aead key %d\n", __func__, rc);
2153                 return rc;
2154         }
2155
2156         rc = crypto_aead_setauthsize(tfm, SMB2_SIGNATURE_SIZE);
2157         if (rc) {
2158                 cifs_dbg(VFS, "%s: Failed to set authsize %d\n", __func__, rc);
2159                 return rc;
2160         }
2161
2162         req = aead_request_alloc(tfm, GFP_KERNEL);
2163         if (!req) {
2164                 cifs_dbg(VFS, "%s: Failed to alloc aead request", __func__);
2165                 return -ENOMEM;
2166         }
2167
2168         if (!enc) {
2169                 memcpy(sign, &tr_hdr->Signature, SMB2_SIGNATURE_SIZE);
2170                 crypt_len += SMB2_SIGNATURE_SIZE;
2171         }
2172
2173         sg = init_sg(rqst, sign);
2174         if (!sg) {
2175                 cifs_dbg(VFS, "%s: Failed to init sg", __func__);
2176                 rc = -ENOMEM;
2177                 goto free_req;
2178         }
2179
2180         iv_len = crypto_aead_ivsize(tfm);
2181         iv = kzalloc(iv_len, GFP_KERNEL);
2182         if (!iv) {
2183                 cifs_dbg(VFS, "%s: Failed to alloc IV", __func__);
2184                 rc = -ENOMEM;
2185                 goto free_sg;
2186         }
2187         iv[0] = 3;
2188         memcpy(iv + 1, (char *)tr_hdr->Nonce, SMB3_AES128CMM_NONCE);
2189
2190         aead_request_set_crypt(req, sg, sg, crypt_len, iv);
2191         aead_request_set_ad(req, assoc_data_len);
2192
2193         aead_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
2194                                   crypto_req_done, &wait);
2195
2196         rc = crypto_wait_req(enc ? crypto_aead_encrypt(req)
2197                                 : crypto_aead_decrypt(req), &wait);
2198
2199         if (!rc && enc)
2200                 memcpy(&tr_hdr->Signature, sign, SMB2_SIGNATURE_SIZE);
2201
2202         kfree(iv);
2203 free_sg:
2204         kfree(sg);
2205 free_req:
2206         kfree(req);
2207         return rc;
2208 }
2209
2210 static int
2211 smb3_init_transform_rq(struct TCP_Server_Info *server, struct smb_rqst *new_rq,
2212                        struct smb_rqst *old_rq)
2213 {
2214         struct kvec *iov;
2215         struct page **pages;
2216         struct smb2_transform_hdr *tr_hdr;
2217         unsigned int npages = old_rq->rq_npages;
2218         int i;
2219         int rc = -ENOMEM;
2220
2221         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
2222         if (!pages)
2223                 return rc;
2224
2225         new_rq->rq_pages = pages;
2226         new_rq->rq_npages = old_rq->rq_npages;
2227         new_rq->rq_pagesz = old_rq->rq_pagesz;
2228         new_rq->rq_tailsz = old_rq->rq_tailsz;
2229
2230         for (i = 0; i < npages; i++) {
2231                 pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
2232                 if (!pages[i])
2233                         goto err_free_pages;
2234         }
2235
2236         iov = kmalloc_array(old_rq->rq_nvec, sizeof(struct kvec), GFP_KERNEL);
2237         if (!iov)
2238                 goto err_free_pages;
2239
2240         /* copy all iovs from the old except the 1st one (rfc1002 length) */
2241         memcpy(&iov[1], &old_rq->rq_iov[1],
2242                                 sizeof(struct kvec) * (old_rq->rq_nvec - 1));
2243         new_rq->rq_iov = iov;
2244         new_rq->rq_nvec = old_rq->rq_nvec;
2245
2246         tr_hdr = kmalloc(sizeof(struct smb2_transform_hdr), GFP_KERNEL);
2247         if (!tr_hdr)
2248                 goto err_free_iov;
2249
2250         /* fill the 1st iov with a transform header */
2251         fill_transform_hdr(tr_hdr, old_rq);
2252         new_rq->rq_iov[0].iov_base = tr_hdr;
2253         new_rq->rq_iov[0].iov_len = sizeof(struct smb2_transform_hdr);
2254
2255         /* copy pages form the old */
2256         for (i = 0; i < npages; i++) {
2257                 char *dst = kmap(new_rq->rq_pages[i]);
2258                 char *src = kmap(old_rq->rq_pages[i]);
2259                 unsigned int len = (i < npages - 1) ? new_rq->rq_pagesz :
2260                                                         new_rq->rq_tailsz;
2261                 memcpy(dst, src, len);
2262                 kunmap(new_rq->rq_pages[i]);
2263                 kunmap(old_rq->rq_pages[i]);
2264         }
2265
2266         rc = crypt_message(server, new_rq, 1);
2267         cifs_dbg(FYI, "encrypt message returned %d", rc);
2268         if (rc)
2269                 goto err_free_tr_hdr;
2270
2271         return rc;
2272
2273 err_free_tr_hdr:
2274         kfree(tr_hdr);
2275 err_free_iov:
2276         kfree(iov);
2277 err_free_pages:
2278         for (i = i - 1; i >= 0; i--)
2279                 put_page(pages[i]);
2280         kfree(pages);
2281         return rc;
2282 }
2283
2284 static void
2285 smb3_free_transform_rq(struct smb_rqst *rqst)
2286 {
2287         int i = rqst->rq_npages - 1;
2288
2289         for (; i >= 0; i--)
2290                 put_page(rqst->rq_pages[i]);
2291         kfree(rqst->rq_pages);
2292         /* free transform header */
2293         kfree(rqst->rq_iov[0].iov_base);
2294         kfree(rqst->rq_iov);
2295 }
2296
2297 static int
2298 smb3_is_transform_hdr(void *buf)
2299 {
2300         struct smb2_transform_hdr *trhdr = buf;
2301
2302         return trhdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM;
2303 }
2304
2305 static int
2306 decrypt_raw_data(struct TCP_Server_Info *server, char *buf,
2307                  unsigned int buf_data_size, struct page **pages,
2308                  unsigned int npages, unsigned int page_data_size)
2309 {
2310         struct kvec iov[2];
2311         struct smb_rqst rqst = {NULL};
2312         struct smb2_hdr *hdr;
2313         int rc;
2314
2315         iov[0].iov_base = buf;
2316         iov[0].iov_len = sizeof(struct smb2_transform_hdr);
2317         iov[1].iov_base = buf + sizeof(struct smb2_transform_hdr);
2318         iov[1].iov_len = buf_data_size;
2319
2320         rqst.rq_iov = iov;
2321         rqst.rq_nvec = 2;
2322         rqst.rq_pages = pages;
2323         rqst.rq_npages = npages;
2324         rqst.rq_pagesz = PAGE_SIZE;
2325         rqst.rq_tailsz = (page_data_size % PAGE_SIZE) ? : PAGE_SIZE;
2326
2327         rc = crypt_message(server, &rqst, 0);
2328         cifs_dbg(FYI, "decrypt message returned %d\n", rc);
2329
2330         if (rc)
2331                 return rc;
2332
2333         memmove(buf + 4, iov[1].iov_base, buf_data_size);
2334         hdr = (struct smb2_hdr *)buf;
2335         hdr->smb2_buf_length = cpu_to_be32(buf_data_size + page_data_size);
2336         server->total_read = buf_data_size + page_data_size + 4;
2337
2338         return rc;
2339 }
2340
2341 static int
2342 read_data_into_pages(struct TCP_Server_Info *server, struct page **pages,
2343                      unsigned int npages, unsigned int len)
2344 {
2345         int i;
2346         int length;
2347
2348         for (i = 0; i < npages; i++) {
2349                 struct page *page = pages[i];
2350                 size_t n;
2351
2352                 n = len;
2353                 if (len >= PAGE_SIZE) {
2354                         /* enough data to fill the page */
2355                         n = PAGE_SIZE;
2356                         len -= n;
2357                 } else {
2358                         zero_user(page, len, PAGE_SIZE - len);
2359                         len = 0;
2360                 }
2361                 length = cifs_read_page_from_socket(server, page, n);
2362                 if (length < 0)
2363                         return length;
2364                 server->total_read += length;
2365         }
2366
2367         return 0;
2368 }
2369
2370 static int
2371 init_read_bvec(struct page **pages, unsigned int npages, unsigned int data_size,
2372                unsigned int cur_off, struct bio_vec **page_vec)
2373 {
2374         struct bio_vec *bvec;
2375         int i;
2376
2377         bvec = kcalloc(npages, sizeof(struct bio_vec), GFP_KERNEL);
2378         if (!bvec)
2379                 return -ENOMEM;
2380
2381         for (i = 0; i < npages; i++) {
2382                 bvec[i].bv_page = pages[i];
2383                 bvec[i].bv_offset = (i == 0) ? cur_off : 0;
2384                 bvec[i].bv_len = min_t(unsigned int, PAGE_SIZE, data_size);
2385                 data_size -= bvec[i].bv_len;
2386         }
2387
2388         if (data_size != 0) {
2389                 cifs_dbg(VFS, "%s: something went wrong\n", __func__);
2390                 kfree(bvec);
2391                 return -EIO;
2392         }
2393
2394         *page_vec = bvec;
2395         return 0;
2396 }
2397
2398 static int
2399 handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid,
2400                  char *buf, unsigned int buf_len, struct page **pages,
2401                  unsigned int npages, unsigned int page_data_size)
2402 {
2403         unsigned int data_offset;
2404         unsigned int data_len;
2405         unsigned int cur_off;
2406         unsigned int cur_page_idx;
2407         unsigned int pad_len;
2408         struct cifs_readdata *rdata = mid->callback_data;
2409         struct smb2_sync_hdr *shdr = get_sync_hdr(buf);
2410         struct bio_vec *bvec = NULL;
2411         struct iov_iter iter;
2412         struct kvec iov;
2413         int length;
2414
2415         if (shdr->Command != SMB2_READ) {
2416                 cifs_dbg(VFS, "only big read responses are supported\n");
2417                 return -ENOTSUPP;
2418         }
2419
2420         if (server->ops->is_session_expired &&
2421             server->ops->is_session_expired(buf)) {
2422                 cifs_reconnect(server);
2423                 wake_up(&server->response_q);
2424                 return -1;
2425         }
2426
2427         if (server->ops->is_status_pending &&
2428                         server->ops->is_status_pending(buf, server, 0))
2429                 return -1;
2430
2431         rdata->result = server->ops->map_error(buf, false);
2432         if (rdata->result != 0) {
2433                 cifs_dbg(FYI, "%s: server returned error %d\n",
2434                          __func__, rdata->result);
2435                 dequeue_mid(mid, rdata->result);
2436                 return 0;
2437         }
2438
2439         data_offset = server->ops->read_data_offset(buf) + 4;
2440         data_len = server->ops->read_data_length(buf);
2441
2442         if (data_offset < server->vals->read_rsp_size) {
2443                 /*
2444                  * win2k8 sometimes sends an offset of 0 when the read
2445                  * is beyond the EOF. Treat it as if the data starts just after
2446                  * the header.
2447                  */
2448                 cifs_dbg(FYI, "%s: data offset (%u) inside read response header\n",
2449                          __func__, data_offset);
2450                 data_offset = server->vals->read_rsp_size;
2451         } else if (data_offset > MAX_CIFS_SMALL_BUFFER_SIZE) {
2452                 /* data_offset is beyond the end of smallbuf */
2453                 cifs_dbg(FYI, "%s: data offset (%u) beyond end of smallbuf\n",
2454                          __func__, data_offset);
2455                 rdata->result = -EIO;
2456                 dequeue_mid(mid, rdata->result);
2457                 return 0;
2458         }
2459
2460         pad_len = data_offset - server->vals->read_rsp_size;
2461
2462         if (buf_len <= data_offset) {
2463                 /* read response payload is in pages */
2464                 cur_page_idx = pad_len / PAGE_SIZE;
2465                 cur_off = pad_len % PAGE_SIZE;
2466
2467                 if (cur_page_idx != 0) {
2468                         /* data offset is beyond the 1st page of response */
2469                         cifs_dbg(FYI, "%s: data offset (%u) beyond 1st page of response\n",
2470                                  __func__, data_offset);
2471                         rdata->result = -EIO;
2472                         dequeue_mid(mid, rdata->result);
2473                         return 0;
2474                 }
2475
2476                 if (data_len > page_data_size - pad_len) {
2477                         /* data_len is corrupt -- discard frame */
2478                         rdata->result = -EIO;
2479                         dequeue_mid(mid, rdata->result);
2480                         return 0;
2481                 }
2482
2483                 rdata->result = init_read_bvec(pages, npages, page_data_size,
2484                                                cur_off, &bvec);
2485                 if (rdata->result != 0) {
2486                         dequeue_mid(mid, rdata->result);
2487                         return 0;
2488                 }
2489
2490                 iov_iter_bvec(&iter, WRITE | ITER_BVEC, bvec, npages, data_len);
2491         } else if (buf_len >= data_offset + data_len) {
2492                 /* read response payload is in buf */
2493                 WARN_ONCE(npages > 0, "read data can be either in buf or in pages");
2494                 iov.iov_base = buf + data_offset;
2495                 iov.iov_len = data_len;
2496                 iov_iter_kvec(&iter, WRITE | ITER_KVEC, &iov, 1, data_len);
2497         } else {
2498                 /* read response payload cannot be in both buf and pages */
2499                 WARN_ONCE(1, "buf can not contain only a part of read data");
2500                 rdata->result = -EIO;
2501                 dequeue_mid(mid, rdata->result);
2502                 return 0;
2503         }
2504
2505         /* set up first iov for signature check */
2506         rdata->iov[0].iov_base = buf;
2507         rdata->iov[0].iov_len = 4;
2508         rdata->iov[1].iov_base = buf + 4;
2509         rdata->iov[1].iov_len = server->vals->read_rsp_size - 4;
2510         cifs_dbg(FYI, "0: iov_base=%p iov_len=%zu\n",
2511                  rdata->iov[0].iov_base, server->vals->read_rsp_size);
2512
2513         length = rdata->copy_into_pages(server, rdata, &iter);
2514
2515         kfree(bvec);
2516
2517         if (length < 0)
2518                 return length;
2519
2520         dequeue_mid(mid, false);
2521         return length;
2522 }
2523
2524 static int
2525 receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid)
2526 {
2527         char *buf = server->smallbuf;
2528         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
2529         unsigned int npages;
2530         struct page **pages;
2531         unsigned int len;
2532         unsigned int buflen = get_rfc1002_length(buf) + 4;
2533         int rc;
2534         int i = 0;
2535
2536         len = min_t(unsigned int, buflen, server->vals->read_rsp_size - 4 +
2537                 sizeof(struct smb2_transform_hdr)) - HEADER_SIZE(server) + 1;
2538
2539         rc = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, len);
2540         if (rc < 0)
2541                 return rc;
2542         server->total_read += rc;
2543
2544         len = le32_to_cpu(tr_hdr->OriginalMessageSize) + 4 -
2545                                                 server->vals->read_rsp_size;
2546         npages = DIV_ROUND_UP(len, PAGE_SIZE);
2547
2548         pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
2549         if (!pages) {
2550                 rc = -ENOMEM;
2551                 goto discard_data;
2552         }
2553
2554         for (; i < npages; i++) {
2555                 pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM);
2556                 if (!pages[i]) {
2557                         rc = -ENOMEM;
2558                         goto discard_data;
2559                 }
2560         }
2561
2562         /* read read data into pages */
2563         rc = read_data_into_pages(server, pages, npages, len);
2564         if (rc)
2565                 goto free_pages;
2566
2567         rc = cifs_discard_remaining_data(server);
2568         if (rc)
2569                 goto free_pages;
2570
2571         rc = decrypt_raw_data(server, buf, server->vals->read_rsp_size - 4,
2572                               pages, npages, len);
2573         if (rc)
2574                 goto free_pages;
2575
2576         *mid = smb2_find_mid(server, buf);
2577         if (*mid == NULL)
2578                 cifs_dbg(FYI, "mid not found\n");
2579         else {
2580                 cifs_dbg(FYI, "mid found\n");
2581                 (*mid)->decrypted = true;
2582                 rc = handle_read_data(server, *mid, buf,
2583                                       server->vals->read_rsp_size,
2584                                       pages, npages, len);
2585         }
2586
2587 free_pages:
2588         for (i = i - 1; i >= 0; i--)
2589                 put_page(pages[i]);
2590         kfree(pages);
2591         return rc;
2592 discard_data:
2593         cifs_discard_remaining_data(server);
2594         goto free_pages;
2595 }
2596
2597 static int
2598 receive_encrypted_standard(struct TCP_Server_Info *server,
2599                            struct mid_q_entry **mid)
2600 {
2601         int length;
2602         char *buf = server->smallbuf;
2603         unsigned int pdu_length = get_rfc1002_length(buf);
2604         unsigned int buf_size;
2605         struct mid_q_entry *mid_entry;
2606
2607         /* switch to large buffer if too big for a small one */
2608         if (pdu_length + 4 > MAX_CIFS_SMALL_BUFFER_SIZE) {
2609                 server->large_buf = true;
2610                 memcpy(server->bigbuf, buf, server->total_read);
2611                 buf = server->bigbuf;
2612         }
2613
2614         /* now read the rest */
2615         length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
2616                                 pdu_length - HEADER_SIZE(server) + 1 + 4);
2617         if (length < 0)
2618                 return length;
2619         server->total_read += length;
2620
2621         buf_size = pdu_length + 4 - sizeof(struct smb2_transform_hdr);
2622         length = decrypt_raw_data(server, buf, buf_size, NULL, 0, 0);
2623         if (length)
2624                 return length;
2625
2626         mid_entry = smb2_find_mid(server, buf);
2627         if (mid_entry == NULL)
2628                 cifs_dbg(FYI, "mid not found\n");
2629         else {
2630                 cifs_dbg(FYI, "mid found\n");
2631                 mid_entry->decrypted = true;
2632         }
2633
2634         *mid = mid_entry;
2635
2636         if (mid_entry && mid_entry->handle)
2637                 return mid_entry->handle(server, mid_entry);
2638
2639         return cifs_handle_standard(server, mid_entry);
2640 }
2641
2642 static int
2643 smb3_receive_transform(struct TCP_Server_Info *server, struct mid_q_entry **mid)
2644 {
2645         char *buf = server->smallbuf;
2646         unsigned int pdu_length = get_rfc1002_length(buf);
2647         struct smb2_transform_hdr *tr_hdr = (struct smb2_transform_hdr *)buf;
2648         unsigned int orig_len = le32_to_cpu(tr_hdr->OriginalMessageSize);
2649
2650         if (pdu_length + 4 < sizeof(struct smb2_transform_hdr) +
2651                                                 sizeof(struct smb2_sync_hdr)) {
2652                 cifs_dbg(VFS, "Transform message is too small (%u)\n",
2653                          pdu_length);
2654                 cifs_reconnect(server);
2655                 wake_up(&server->response_q);
2656                 return -ECONNABORTED;
2657         }
2658
2659         if (pdu_length + 4 < orig_len + sizeof(struct smb2_transform_hdr)) {
2660                 cifs_dbg(VFS, "Transform message is broken\n");
2661                 cifs_reconnect(server);
2662                 wake_up(&server->response_q);
2663                 return -ECONNABORTED;
2664         }
2665
2666         if (pdu_length + 4 > CIFSMaxBufSize + MAX_HEADER_SIZE(server))
2667                 return receive_encrypted_read(server, mid);
2668
2669         return receive_encrypted_standard(server, mid);
2670 }
2671
2672 int
2673 smb3_handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid)
2674 {
2675         char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
2676
2677         return handle_read_data(server, mid, buf, get_rfc1002_length(buf) + 4,
2678                                 NULL, 0, 0);
2679 }
2680
2681 struct smb_version_operations smb20_operations = {
2682         .compare_fids = smb2_compare_fids,
2683         .setup_request = smb2_setup_request,
2684         .setup_async_request = smb2_setup_async_request,
2685         .check_receive = smb2_check_receive,
2686         .add_credits = smb2_add_credits,
2687         .set_credits = smb2_set_credits,
2688         .get_credits_field = smb2_get_credits_field,
2689         .get_credits = smb2_get_credits,
2690         .wait_mtu_credits = cifs_wait_mtu_credits,
2691         .get_next_mid = smb2_get_next_mid,
2692         .read_data_offset = smb2_read_data_offset,
2693         .read_data_length = smb2_read_data_length,
2694         .map_error = map_smb2_to_linux_error,
2695         .find_mid = smb2_find_mid,
2696         .check_message = smb2_check_message,
2697         .dump_detail = smb2_dump_detail,
2698         .clear_stats = smb2_clear_stats,
2699         .print_stats = smb2_print_stats,
2700         .is_oplock_break = smb2_is_valid_oplock_break,
2701         .handle_cancelled_mid = smb2_handle_cancelled_mid,
2702         .downgrade_oplock = smb2_downgrade_oplock,
2703         .need_neg = smb2_need_neg,
2704         .negotiate = smb2_negotiate,
2705         .negotiate_wsize = smb2_negotiate_wsize,
2706         .negotiate_rsize = smb2_negotiate_rsize,
2707         .sess_setup = SMB2_sess_setup,
2708         .logoff = SMB2_logoff,
2709         .tree_connect = SMB2_tcon,
2710         .tree_disconnect = SMB2_tdis,
2711         .qfs_tcon = smb2_qfs_tcon,
2712         .is_path_accessible = smb2_is_path_accessible,
2713         .can_echo = smb2_can_echo,
2714         .echo = SMB2_echo,
2715         .query_path_info = smb2_query_path_info,
2716         .get_srv_inum = smb2_get_srv_inum,
2717         .query_file_info = smb2_query_file_info,
2718         .set_path_size = smb2_set_path_size,
2719         .set_file_size = smb2_set_file_size,
2720         .set_file_info = smb2_set_file_info,
2721         .set_compression = smb2_set_compression,
2722         .mkdir = smb2_mkdir,
2723         .mkdir_setinfo = smb2_mkdir_setinfo,
2724         .rmdir = smb2_rmdir,
2725         .unlink = smb2_unlink,
2726         .rename = smb2_rename_path,
2727         .create_hardlink = smb2_create_hardlink,
2728         .query_symlink = smb2_query_symlink,
2729         .query_mf_symlink = smb3_query_mf_symlink,
2730         .create_mf_symlink = smb3_create_mf_symlink,
2731         .open = smb2_open_file,
2732         .set_fid = smb2_set_fid,
2733         .close = smb2_close_file,
2734         .flush = smb2_flush_file,
2735         .async_readv = smb2_async_readv,
2736         .async_writev = smb2_async_writev,
2737         .sync_read = smb2_sync_read,
2738         .sync_write = smb2_sync_write,
2739         .query_dir_first = smb2_query_dir_first,
2740         .query_dir_next = smb2_query_dir_next,
2741         .close_dir = smb2_close_dir,
2742         .calc_smb_size = smb2_calc_size,
2743         .is_status_pending = smb2_is_status_pending,
2744         .is_session_expired = smb2_is_session_expired,
2745         .oplock_response = smb2_oplock_response,
2746         .queryfs = smb2_queryfs,
2747         .mand_lock = smb2_mand_lock,
2748         .mand_unlock_range = smb2_unlock_range,
2749         .push_mand_locks = smb2_push_mandatory_locks,
2750         .get_lease_key = smb2_get_lease_key,
2751         .set_lease_key = smb2_set_lease_key,
2752         .new_lease_key = smb2_new_lease_key,
2753         .calc_signature = smb2_calc_signature,
2754         .is_read_op = smb2_is_read_op,
2755         .set_oplock_level = smb2_set_oplock_level,
2756         .create_lease_buf = smb2_create_lease_buf,
2757         .parse_lease_buf = smb2_parse_lease_buf,
2758         .copychunk_range = smb2_copychunk_range,
2759         .wp_retry_size = smb2_wp_retry_size,
2760         .dir_needs_close = smb2_dir_needs_close,
2761         .get_dfs_refer = smb2_get_dfs_refer,
2762         .select_sectype = smb2_select_sectype,
2763 #ifdef CONFIG_CIFS_XATTR
2764         .query_all_EAs = smb2_query_eas,
2765         .set_EA = smb2_set_ea,
2766 #endif /* CIFS_XATTR */
2767 #ifdef CONFIG_CIFS_ACL
2768         .get_acl = get_smb2_acl,
2769         .get_acl_by_fid = get_smb2_acl_by_fid,
2770         .set_acl = set_smb2_acl,
2771 #endif /* CIFS_ACL */
2772 };
2773
2774 struct smb_version_operations smb21_operations = {
2775         .compare_fids = smb2_compare_fids,
2776         .setup_request = smb2_setup_request,
2777         .setup_async_request = smb2_setup_async_request,
2778         .check_receive = smb2_check_receive,
2779         .add_credits = smb2_add_credits,
2780         .set_credits = smb2_set_credits,
2781         .get_credits_field = smb2_get_credits_field,
2782         .get_credits = smb2_get_credits,
2783         .wait_mtu_credits = smb2_wait_mtu_credits,
2784         .get_next_mid = smb2_get_next_mid,
2785         .read_data_offset = smb2_read_data_offset,
2786         .read_data_length = smb2_read_data_length,
2787         .map_error = map_smb2_to_linux_error,
2788         .find_mid = smb2_find_mid,
2789         .check_message = smb2_check_message,
2790         .dump_detail = smb2_dump_detail,
2791         .clear_stats = smb2_clear_stats,
2792         .print_stats = smb2_print_stats,
2793         .is_oplock_break = smb2_is_valid_oplock_break,
2794         .handle_cancelled_mid = smb2_handle_cancelled_mid,
2795         .downgrade_oplock = smb2_downgrade_oplock,
2796         .need_neg = smb2_need_neg,
2797         .negotiate = smb2_negotiate,
2798         .negotiate_wsize = smb2_negotiate_wsize,
2799         .negotiate_rsize = smb2_negotiate_rsize,
2800         .sess_setup = SMB2_sess_setup,
2801         .logoff = SMB2_logoff,
2802         .tree_connect = SMB2_tcon,
2803         .tree_disconnect = SMB2_tdis,
2804         .qfs_tcon = smb2_qfs_tcon,
2805         .is_path_accessible = smb2_is_path_accessible,
2806         .can_echo = smb2_can_echo,
2807         .echo = SMB2_echo,
2808         .query_path_info = smb2_query_path_info,
2809         .get_srv_inum = smb2_get_srv_inum,
2810         .query_file_info = smb2_query_file_info,
2811         .set_path_size = smb2_set_path_size,
2812         .set_file_size = smb2_set_file_size,
2813         .set_file_info = smb2_set_file_info,
2814         .set_compression = smb2_set_compression,
2815         .mkdir = smb2_mkdir,
2816         .mkdir_setinfo = smb2_mkdir_setinfo,
2817         .rmdir = smb2_rmdir,
2818         .unlink = smb2_unlink,
2819         .rename = smb2_rename_path,
2820         .create_hardlink = smb2_create_hardlink,
2821         .query_symlink = smb2_query_symlink,
2822         .query_mf_symlink = smb3_query_mf_symlink,
2823         .create_mf_symlink = smb3_create_mf_symlink,
2824         .open = smb2_open_file,
2825         .set_fid = smb2_set_fid,
2826         .close = smb2_close_file,
2827         .flush = smb2_flush_file,
2828         .async_readv = smb2_async_readv,
2829         .async_writev = smb2_async_writev,
2830         .sync_read = smb2_sync_read,
2831         .sync_write = smb2_sync_write,
2832         .query_dir_first = smb2_query_dir_first,
2833         .query_dir_next = smb2_query_dir_next,
2834         .close_dir = smb2_close_dir,
2835         .calc_smb_size = smb2_calc_size,
2836         .is_status_pending = smb2_is_status_pending,
2837         .is_session_expired = smb2_is_session_expired,
2838         .oplock_response = smb2_oplock_response,
2839         .queryfs = smb2_queryfs,
2840         .mand_lock = smb2_mand_lock,
2841         .mand_unlock_range = smb2_unlock_range,
2842         .push_mand_locks = smb2_push_mandatory_locks,
2843         .get_lease_key = smb2_get_lease_key,
2844         .set_lease_key = smb2_set_lease_key,
2845         .new_lease_key = smb2_new_lease_key,
2846         .calc_signature = smb2_calc_signature,
2847         .is_read_op = smb21_is_read_op,
2848         .set_oplock_level = smb21_set_oplock_level,
2849         .create_lease_buf = smb2_create_lease_buf,
2850         .parse_lease_buf = smb2_parse_lease_buf,
2851         .copychunk_range = smb2_copychunk_range,
2852         .wp_retry_size = smb2_wp_retry_size,
2853         .dir_needs_close = smb2_dir_needs_close,
2854         .enum_snapshots = smb3_enum_snapshots,
2855         .get_dfs_refer = smb2_get_dfs_refer,
2856         .select_sectype = smb2_select_sectype,
2857 #ifdef CONFIG_CIFS_XATTR
2858         .query_all_EAs = smb2_query_eas,
2859         .set_EA = smb2_set_ea,
2860 #endif /* CIFS_XATTR */
2861 #ifdef CONFIG_CIFS_ACL
2862         .get_acl = get_smb2_acl,
2863         .get_acl_by_fid = get_smb2_acl_by_fid,
2864         .set_acl = set_smb2_acl,
2865 #endif /* CIFS_ACL */
2866 };
2867
2868 struct smb_version_operations smb30_operations = {
2869         .compare_fids = smb2_compare_fids,
2870         .setup_request = smb2_setup_request,
2871         .setup_async_request = smb2_setup_async_request,
2872         .check_receive = smb2_check_receive,
2873         .add_credits = smb2_add_credits,
2874         .set_credits = smb2_set_credits,
2875         .get_credits_field = smb2_get_credits_field,
2876         .get_credits = smb2_get_credits,
2877         .wait_mtu_credits = smb2_wait_mtu_credits,
2878         .get_next_mid = smb2_get_next_mid,
2879         .read_data_offset = smb2_read_data_offset,
2880         .read_data_length = smb2_read_data_length,
2881         .map_error = map_smb2_to_linux_error,
2882         .find_mid = smb2_find_mid,
2883         .check_message = smb2_check_message,
2884         .dump_detail = smb2_dump_detail,
2885         .clear_stats = smb2_clear_stats,
2886         .print_stats = smb2_print_stats,
2887         .dump_share_caps = smb2_dump_share_caps,
2888         .is_oplock_break = smb2_is_valid_oplock_break,
2889         .handle_cancelled_mid = smb2_handle_cancelled_mid,
2890         .downgrade_oplock = smb2_downgrade_oplock,
2891         .need_neg = smb2_need_neg,
2892         .negotiate = smb2_negotiate,
2893         .negotiate_wsize = smb2_negotiate_wsize,
2894         .negotiate_rsize = smb2_negotiate_rsize,
2895         .sess_setup = SMB2_sess_setup,
2896         .logoff = SMB2_logoff,
2897         .tree_connect = SMB2_tcon,
2898         .tree_disconnect = SMB2_tdis,
2899         .qfs_tcon = smb3_qfs_tcon,
2900         .is_path_accessible = smb2_is_path_accessible,
2901         .can_echo = smb2_can_echo,
2902         .echo = SMB2_echo,
2903         .query_path_info = smb2_query_path_info,
2904         .get_srv_inum = smb2_get_srv_inum,
2905         .query_file_info = smb2_query_file_info,
2906         .set_path_size = smb2_set_path_size,
2907         .set_file_size = smb2_set_file_size,
2908         .set_file_info = smb2_set_file_info,
2909         .set_compression = smb2_set_compression,
2910         .mkdir = smb2_mkdir,
2911         .mkdir_setinfo = smb2_mkdir_setinfo,
2912         .rmdir = smb2_rmdir,
2913         .unlink = smb2_unlink,
2914         .rename = smb2_rename_path,
2915         .create_hardlink = smb2_create_hardlink,
2916         .query_symlink = smb2_query_symlink,
2917         .query_mf_symlink = smb3_query_mf_symlink,
2918         .create_mf_symlink = smb3_create_mf_symlink,
2919         .open = smb2_open_file,
2920         .set_fid = smb2_set_fid,
2921         .close = smb2_close_file,
2922         .flush = smb2_flush_file,
2923         .async_readv = smb2_async_readv,
2924         .async_writev = smb2_async_writev,
2925         .sync_read = smb2_sync_read,
2926         .sync_write = smb2_sync_write,
2927         .query_dir_first = smb2_query_dir_first,
2928         .query_dir_next = smb2_query_dir_next,
2929         .close_dir = smb2_close_dir,
2930         .calc_smb_size = smb2_calc_size,
2931         .is_status_pending = smb2_is_status_pending,
2932         .is_session_expired = smb2_is_session_expired,
2933         .oplock_response = smb2_oplock_response,
2934         .queryfs = smb2_queryfs,
2935         .mand_lock = smb2_mand_lock,
2936         .mand_unlock_range = smb2_unlock_range,
2937         .push_mand_locks = smb2_push_mandatory_locks,
2938         .get_lease_key = smb2_get_lease_key,
2939         .set_lease_key = smb2_set_lease_key,
2940         .new_lease_key = smb2_new_lease_key,
2941         .generate_signingkey = generate_smb30signingkey,
2942         .calc_signature = smb3_calc_signature,
2943         .set_integrity  = smb3_set_integrity,
2944         .is_read_op = smb21_is_read_op,
2945         .set_oplock_level = smb3_set_oplock_level,
2946         .create_lease_buf = smb3_create_lease_buf,
2947         .parse_lease_buf = smb3_parse_lease_buf,
2948         .copychunk_range = smb2_copychunk_range,
2949         .duplicate_extents = smb2_duplicate_extents,
2950         .validate_negotiate = smb3_validate_negotiate,
2951         .wp_retry_size = smb2_wp_retry_size,
2952         .dir_needs_close = smb2_dir_needs_close,
2953         .fallocate = smb3_fallocate,
2954         .enum_snapshots = smb3_enum_snapshots,
2955         .init_transform_rq = smb3_init_transform_rq,
2956         .free_transform_rq = smb3_free_transform_rq,
2957         .is_transform_hdr = smb3_is_transform_hdr,
2958         .receive_transform = smb3_receive_transform,
2959         .get_dfs_refer = smb2_get_dfs_refer,
2960         .select_sectype = smb2_select_sectype,
2961 #ifdef CONFIG_CIFS_XATTR
2962         .query_all_EAs = smb2_query_eas,
2963         .set_EA = smb2_set_ea,
2964 #endif /* CIFS_XATTR */
2965 #ifdef CONFIG_CIFS_ACL
2966         .get_acl = get_smb2_acl,
2967         .get_acl_by_fid = get_smb2_acl_by_fid,
2968         .set_acl = set_smb2_acl,
2969 #endif /* CIFS_ACL */
2970 };
2971
2972 #ifdef CONFIG_CIFS_SMB311
2973 struct smb_version_operations smb311_operations = {
2974         .compare_fids = smb2_compare_fids,
2975         .setup_request = smb2_setup_request,
2976         .setup_async_request = smb2_setup_async_request,
2977         .check_receive = smb2_check_receive,
2978         .add_credits = smb2_add_credits,
2979         .set_credits = smb2_set_credits,
2980         .get_credits_field = smb2_get_credits_field,
2981         .get_credits = smb2_get_credits,
2982         .wait_mtu_credits = smb2_wait_mtu_credits,
2983         .get_next_mid = smb2_get_next_mid,
2984         .read_data_offset = smb2_read_data_offset,
2985         .read_data_length = smb2_read_data_length,
2986         .map_error = map_smb2_to_linux_error,
2987         .find_mid = smb2_find_mid,
2988         .check_message = smb2_check_message,
2989         .dump_detail = smb2_dump_detail,
2990         .clear_stats = smb2_clear_stats,
2991         .print_stats = smb2_print_stats,
2992         .dump_share_caps = smb2_dump_share_caps,
2993         .is_oplock_break = smb2_is_valid_oplock_break,
2994         .handle_cancelled_mid = smb2_handle_cancelled_mid,
2995         .downgrade_oplock = smb2_downgrade_oplock,
2996         .need_neg = smb2_need_neg,
2997         .negotiate = smb2_negotiate,
2998         .negotiate_wsize = smb2_negotiate_wsize,
2999         .negotiate_rsize = smb2_negotiate_rsize,
3000         .sess_setup = SMB2_sess_setup,
3001         .logoff = SMB2_logoff,
3002         .tree_connect = SMB2_tcon,
3003         .tree_disconnect = SMB2_tdis,
3004         .qfs_tcon = smb3_qfs_tcon,
3005         .is_path_accessible = smb2_is_path_accessible,
3006         .can_echo = smb2_can_echo,
3007         .echo = SMB2_echo,
3008         .query_path_info = smb2_query_path_info,
3009         .get_srv_inum = smb2_get_srv_inum,
3010         .query_file_info = smb2_query_file_info,
3011         .set_path_size = smb2_set_path_size,
3012         .set_file_size = smb2_set_file_size,
3013         .set_file_info = smb2_set_file_info,
3014         .set_compression = smb2_set_compression,
3015         .mkdir = smb2_mkdir,
3016         .mkdir_setinfo = smb2_mkdir_setinfo,
3017         .rmdir = smb2_rmdir,
3018         .unlink = smb2_unlink,
3019         .rename = smb2_rename_path,
3020         .create_hardlink = smb2_create_hardlink,
3021         .query_symlink = smb2_query_symlink,
3022         .query_mf_symlink = smb3_query_mf_symlink,
3023         .create_mf_symlink = smb3_create_mf_symlink,
3024         .open = smb2_open_file,
3025         .set_fid = smb2_set_fid,
3026         .close = smb2_close_file,
3027         .flush = smb2_flush_file,
3028         .async_readv = smb2_async_readv,
3029         .async_writev = smb2_async_writev,
3030         .sync_read = smb2_sync_read,
3031         .sync_write = smb2_sync_write,
3032         .query_dir_first = smb2_query_dir_first,
3033         .query_dir_next = smb2_query_dir_next,
3034         .close_dir = smb2_close_dir,
3035         .calc_smb_size = smb2_calc_size,
3036         .is_status_pending = smb2_is_status_pending,
3037         .is_session_expired = smb2_is_session_expired,
3038         .oplock_response = smb2_oplock_response,
3039         .queryfs = smb2_queryfs,
3040         .mand_lock = smb2_mand_lock,
3041         .mand_unlock_range = smb2_unlock_range,
3042         .push_mand_locks = smb2_push_mandatory_locks,
3043         .get_lease_key = smb2_get_lease_key,
3044         .set_lease_key = smb2_set_lease_key,
3045         .new_lease_key = smb2_new_lease_key,
3046         .generate_signingkey = generate_smb311signingkey,
3047         .calc_signature = smb3_calc_signature,
3048         .set_integrity  = smb3_set_integrity,
3049         .is_read_op = smb21_is_read_op,
3050         .set_oplock_level = smb3_set_oplock_level,
3051         .create_lease_buf = smb3_create_lease_buf,
3052         .parse_lease_buf = smb3_parse_lease_buf,
3053         .copychunk_range = smb2_copychunk_range,
3054         .duplicate_extents = smb2_duplicate_extents,
3055 /*      .validate_negotiate = smb3_validate_negotiate, */ /* not used in 3.11 */
3056         .wp_retry_size = smb2_wp_retry_size,
3057         .dir_needs_close = smb2_dir_needs_close,
3058         .fallocate = smb3_fallocate,
3059         .enum_snapshots = smb3_enum_snapshots,
3060         .init_transform_rq = smb3_init_transform_rq,
3061         .free_transform_rq = smb3_free_transform_rq,
3062         .is_transform_hdr = smb3_is_transform_hdr,
3063         .receive_transform = smb3_receive_transform,
3064         .get_dfs_refer = smb2_get_dfs_refer,
3065         .select_sectype = smb2_select_sectype,
3066 #ifdef CONFIG_CIFS_XATTR
3067         .query_all_EAs = smb2_query_eas,
3068         .set_EA = smb2_set_ea,
3069 #endif /* CIFS_XATTR */
3070 };
3071 #endif /* CIFS_SMB311 */
3072
3073 struct smb_version_values smb20_values = {
3074         .version_string = SMB20_VERSION_STRING,
3075         .protocol_id = SMB20_PROT_ID,
3076         .req_capabilities = 0, /* MBZ */
3077         .large_lock_type = 0,
3078         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
3079         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
3080         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
3081         .header_size = sizeof(struct smb2_hdr),
3082         .max_header_size = MAX_SMB2_HDR_SIZE,
3083         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
3084         .lock_cmd = SMB2_LOCK,
3085         .cap_unix = 0,
3086         .cap_nt_find = SMB2_NT_FIND,
3087         .cap_large_files = SMB2_LARGE_FILES,
3088         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
3089         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
3090         .create_lease_size = sizeof(struct create_lease),
3091 };
3092
3093 struct smb_version_values smb21_values = {
3094         .version_string = SMB21_VERSION_STRING,
3095         .protocol_id = SMB21_PROT_ID,
3096         .req_capabilities = 0, /* MBZ on negotiate req until SMB3 dialect */
3097         .large_lock_type = 0,
3098         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
3099         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
3100         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
3101         .header_size = sizeof(struct smb2_hdr),
3102         .max_header_size = MAX_SMB2_HDR_SIZE,
3103         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
3104         .lock_cmd = SMB2_LOCK,
3105         .cap_unix = 0,
3106         .cap_nt_find = SMB2_NT_FIND,
3107         .cap_large_files = SMB2_LARGE_FILES,
3108         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
3109         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
3110         .create_lease_size = sizeof(struct create_lease),
3111 };
3112
3113 struct smb_version_values smb3any_values = {
3114         .version_string = SMB3ANY_VERSION_STRING,
3115         .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
3116         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
3117         .large_lock_type = 0,
3118         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
3119         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
3120         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
3121         .header_size = sizeof(struct smb2_hdr),
3122         .max_header_size = MAX_SMB2_HDR_SIZE,
3123         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
3124         .lock_cmd = SMB2_LOCK,
3125         .cap_unix = 0,
3126         .cap_nt_find = SMB2_NT_FIND,
3127         .cap_large_files = SMB2_LARGE_FILES,
3128         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
3129         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
3130         .create_lease_size = sizeof(struct create_lease_v2),
3131 };
3132
3133 struct smb_version_values smbdefault_values = {
3134         .version_string = SMBDEFAULT_VERSION_STRING,
3135         .protocol_id = SMB302_PROT_ID, /* doesn't matter, send protocol array */
3136         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
3137         .large_lock_type = 0,
3138         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
3139         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
3140         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
3141         .header_size = sizeof(struct smb2_hdr),
3142         .max_header_size = MAX_SMB2_HDR_SIZE,
3143         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
3144         .lock_cmd = SMB2_LOCK,
3145         .cap_unix = 0,
3146         .cap_nt_find = SMB2_NT_FIND,
3147         .cap_large_files = SMB2_LARGE_FILES,
3148         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
3149         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
3150         .create_lease_size = sizeof(struct create_lease_v2),
3151 };
3152
3153 struct smb_version_values smb30_values = {
3154         .version_string = SMB30_VERSION_STRING,
3155         .protocol_id = SMB30_PROT_ID,
3156         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
3157         .large_lock_type = 0,
3158         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
3159         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
3160         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
3161         .header_size = sizeof(struct smb2_hdr),
3162         .max_header_size = MAX_SMB2_HDR_SIZE,
3163         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
3164         .lock_cmd = SMB2_LOCK,
3165         .cap_unix = 0,
3166         .cap_nt_find = SMB2_NT_FIND,
3167         .cap_large_files = SMB2_LARGE_FILES,
3168         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
3169         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
3170         .create_lease_size = sizeof(struct create_lease_v2),
3171 };
3172
3173 struct smb_version_values smb302_values = {
3174         .version_string = SMB302_VERSION_STRING,
3175         .protocol_id = SMB302_PROT_ID,
3176         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
3177         .large_lock_type = 0,
3178         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
3179         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
3180         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
3181         .header_size = sizeof(struct smb2_hdr),
3182         .max_header_size = MAX_SMB2_HDR_SIZE,
3183         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
3184         .lock_cmd = SMB2_LOCK,
3185         .cap_unix = 0,
3186         .cap_nt_find = SMB2_NT_FIND,
3187         .cap_large_files = SMB2_LARGE_FILES,
3188         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
3189         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
3190         .create_lease_size = sizeof(struct create_lease_v2),
3191 };
3192
3193 #ifdef CONFIG_CIFS_SMB311
3194 struct smb_version_values smb311_values = {
3195         .version_string = SMB311_VERSION_STRING,
3196         .protocol_id = SMB311_PROT_ID,
3197         .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES | SMB2_GLOBAL_CAP_ENCRYPTION,
3198         .large_lock_type = 0,
3199         .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK,
3200         .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,
3201         .unlock_lock_type = SMB2_LOCKFLAG_UNLOCK,
3202         .header_size = sizeof(struct smb2_hdr),
3203         .max_header_size = MAX_SMB2_HDR_SIZE,
3204         .read_rsp_size = sizeof(struct smb2_read_rsp) - 1,
3205         .lock_cmd = SMB2_LOCK,
3206         .cap_unix = 0,
3207         .cap_nt_find = SMB2_NT_FIND,
3208         .cap_large_files = SMB2_LARGE_FILES,
3209         .signing_enabled = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED,
3210         .signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
3211         .create_lease_size = sizeof(struct create_lease_v2),
3212 };
3213 #endif /* SMB311 */