fs/cifs/smb2misc.c

   1 /*
   2  *   fs/cifs/smb2misc.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2011
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French ([email protected])
   7  *              Pavel Shilovsky ([email protected]) 2012
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23 #include <linux/ctype.h>
  24 #include "smb2pdu.h"
  25 #include "cifsglob.h"
  26 #include "cifsproto.h"
  27 #include "smb2proto.h"
  28 #include "cifs_debug.h"
  29 #include "cifs_unicode.h"
  30 #include "smb2status.h"
  31 #include "smb2glob.h"
  32
  33 static int
  34 check_smb2_hdr(struct smb2_sync_hdr *shdr, __u64 mid)
  35 {
  36         __u64 wire_mid = le64_to_cpu(shdr->MessageId);
  37
  38         /*
  39          * Make sure that this really is an SMB, that it is a response,
  40          * and that the message ids match.
  41          */
  42         if ((shdr->ProtocolId == SMB2_PROTO_NUMBER) &&
  43             (mid == wire_mid)) {
  44                 if (shdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
  45                         return 0;
  46                 else {
  47                         /* only one valid case where server sends us request */
  48                         if (shdr->Command == SMB2_OPLOCK_BREAK)
  49                                 return 0;
  50                         else
  51                                 cifs_dbg(VFS, "Received Request not response\n");
  52                 }
  53         } else { /* bad signature or mid */
  54                 if (shdr->ProtocolId != SMB2_PROTO_NUMBER)
  55                         cifs_dbg(VFS, "Bad protocol string signature header %x\n",
  56                                  le32_to_cpu(shdr->ProtocolId));
  57                 if (mid != wire_mid)
  58                         cifs_dbg(VFS, "Mids do not match: %llu and %llu\n",
  59                                  mid, wire_mid);
  60         }
  61         cifs_dbg(VFS, "Bad SMB detected. The Mid=%llu\n", wire_mid);
  62         return 1;
  63 }
  64
  65 /*
  66  *  The following table defines the expected "StructureSize" of SMB2 responses
  67  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS responses.
  68  *
  69  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  70  *  indexed by command in host byte order
  71  */
  72 static const __le16 smb2_rsp_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  73         /* SMB2_NEGOTIATE */ cpu_to_le16(65),
  74         /* SMB2_SESSION_SETUP */ cpu_to_le16(9),
  75         /* SMB2_LOGOFF */ cpu_to_le16(4),
  76         /* SMB2_TREE_CONNECT */ cpu_to_le16(16),
  77         /* SMB2_TREE_DISCONNECT */ cpu_to_le16(4),
  78         /* SMB2_CREATE */ cpu_to_le16(89),
  79         /* SMB2_CLOSE */ cpu_to_le16(60),
  80         /* SMB2_FLUSH */ cpu_to_le16(4),
  81         /* SMB2_READ */ cpu_to_le16(17),
  82         /* SMB2_WRITE */ cpu_to_le16(17),
  83         /* SMB2_LOCK */ cpu_to_le16(4),
  84         /* SMB2_IOCTL */ cpu_to_le16(49),
  85         /* BB CHECK this ... not listed in documentation */
  86         /* SMB2_CANCEL */ cpu_to_le16(0),
  87         /* SMB2_ECHO */ cpu_to_le16(4),
  88         /* SMB2_QUERY_DIRECTORY */ cpu_to_le16(9),
  89         /* SMB2_CHANGE_NOTIFY */ cpu_to_le16(9),
  90         /* SMB2_QUERY_INFO */ cpu_to_le16(9),
  91         /* SMB2_SET_INFO */ cpu_to_le16(2),
  92         /* BB FIXME can also be 44 for lease break */
  93         /* SMB2_OPLOCK_BREAK */ cpu_to_le16(24)
  94 };
  95
  96 #ifdef CONFIG_CIFS_SMB311
  97 static __u32 get_neg_ctxt_len(struct smb2_sync_hdr *hdr, __u32 len,
  98                               __u32 non_ctxlen)
  99 {
 100         __u16 neg_count;
 101         __u32 nc_offset, size_of_pad_before_neg_ctxts;
 102         struct smb2_negotiate_rsp *pneg_rsp = (struct smb2_negotiate_rsp *)hdr;
 103
 104         /* Negotiate contexts are only valid for latest dialect SMB3.11 */
 105         neg_count = le16_to_cpu(pneg_rsp->NegotiateContextCount);
 106         if ((neg_count == 0) ||
 107            (pneg_rsp->DialectRevision != cpu_to_le16(SMB311_PROT_ID)))
 108                 return 0;
 109
 110         /* Make sure that negotiate contexts start after gss security blob */
 111         nc_offset = le32_to_cpu(pneg_rsp->NegotiateContextOffset);
 112         if (nc_offset < non_ctxlen) {
 113                 printk_once(KERN_WARNING "invalid negotiate context offset\n");
 114                 return 0;
 115         }
 116         size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen;
 117
 118         /* Verify that at least minimal negotiate contexts fit within frame */
 119         if (len < nc_offset + (neg_count * sizeof(struct smb2_neg_context))) {
 120                 printk_once(KERN_WARNING "negotiate context goes beyond end\n");
 121                 return 0;
 122         }
 123
 124         cifs_dbg(FYI, "length of negcontexts %d pad %d\n",
 125                 len - nc_offset, size_of_pad_before_neg_ctxts);
 126
 127         /* length of negcontexts including pad from end of sec blob to them */
 128         return (len - nc_offset) + size_of_pad_before_neg_ctxts;
 129 }
 130 #endif /* CIFS_SMB311 */
 131
 132 int
 133 smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *srvr)
 134 {
 135         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
 136         struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)shdr;
 137         __u64 mid;
 138         __u32 clc_len;  /* calculated length */
 139         int command;
 140         int pdu_size = sizeof(struct smb2_sync_pdu);
 141         int hdr_size = sizeof(struct smb2_sync_hdr);
 142
 143         /*
 144          * Add function to do table lookup of StructureSize by command
 145          * ie Validate the wct via smb2_struct_sizes table above
 146          */
 147         if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
 148                 struct smb2_transform_hdr *thdr =
 149                         (struct smb2_transform_hdr *)buf;
 150                 struct cifs_ses *ses = NULL;
 151                 struct list_head *tmp;
 152
 153                 /* decrypt frame now that it is completely read in */
 154                 spin_lock(&cifs_tcp_ses_lock);
 155                 list_for_each(tmp, &srvr->smb_ses_list) {
 156                         ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
 157                         if (ses->Suid == thdr->SessionId)
 158                                 break;
 159
 160                         ses = NULL;
 161                 }
 162                 spin_unlock(&cifs_tcp_ses_lock);
 163                 if (ses == NULL) {
 164                         cifs_dbg(VFS, "no decryption - session id not found\n");
 165                         return 1;
 166                 }
 167         }
 168
 169         mid = le64_to_cpu(shdr->MessageId);
 170         if (len < pdu_size) {
 171                 if ((len >= hdr_size)
 172                     && (shdr->Status != 0)) {
 173                         pdu->StructureSize2 = 0;
 174                         /*
 175                          * As with SMB/CIFS, on some error cases servers may
 176                          * not return wct properly
 177                          */
 178                         return 0;
 179                 } else {
 180                         cifs_dbg(VFS, "Length less than SMB header size\n");
 181                 }
 182                 return 1;
 183         }
 184         if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE) {
 185                 cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n",
 186                          mid);
 187                 return 1;
 188         }
 189
 190         if (check_smb2_hdr(shdr, mid))
 191                 return 1;
 192
 193         if (shdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
 194                 cifs_dbg(VFS, "Illegal structure size %u\n",
 195                          le16_to_cpu(shdr->StructureSize));
 196                 return 1;
 197         }
 198
 199         command = le16_to_cpu(shdr->Command);
 200         if (command >= NUMBER_OF_SMB2_COMMANDS) {
 201                 cifs_dbg(VFS, "Illegal SMB2 command %d\n", command);
 202                 return 1;
 203         }
 204
 205         if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
 206                 if (command != SMB2_OPLOCK_BREAK_HE && (shdr->Status == 0 ||
 207                     pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) {
 208                         /* error packets have 9 byte structure size */
 209                         cifs_dbg(VFS, "Illegal response size %u for command %d\n",
 210                                  le16_to_cpu(pdu->StructureSize2), command);
 211                         return 1;
 212                 } else if (command == SMB2_OPLOCK_BREAK_HE
 213                            && (shdr->Status == 0)
 214                            && (le16_to_cpu(pdu->StructureSize2) != 44)
 215                            && (le16_to_cpu(pdu->StructureSize2) != 36)) {
 216                         /* special case for SMB2.1 lease break message */
 217                         cifs_dbg(VFS, "Illegal response size %d for oplock break\n",
 218                                  le16_to_cpu(pdu->StructureSize2));
 219                         return 1;
 220                 }
 221         }
 222
 223         clc_len = smb2_calc_size(buf, srvr);
 224
 225 #ifdef CONFIG_CIFS_SMB311
 226         if (shdr->Command == SMB2_NEGOTIATE)
 227                 clc_len += get_neg_ctxt_len(shdr, len, clc_len);
 228 #endif /* SMB311 */
 229         if (len != clc_len) {
 230                 cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n",
 231                          clc_len, len, mid);
 232                 /* create failed on symlink */
 233                 if (command == SMB2_CREATE_HE &&
 234                     shdr->Status == STATUS_STOPPED_ON_SYMLINK)
 235                         return 0;
 236                 /* Windows 7 server returns 24 bytes more */
 237                 if (clc_len + 24 == len && command == SMB2_OPLOCK_BREAK_HE)
 238                         return 0;
 239                 /* server can return one byte more due to implied bcc[0] */
 240                 if (clc_len == len + 1)
 241                         return 0;
 242
 243                 /*
 244                  * MacOS server pads after SMB2.1 write response with 3 bytes
 245                  * of junk. Other servers match RFC1001 len to actual
 246                  * SMB2/SMB3 frame length (header + smb2 response specific data)
 247                  * Some windows servers do too when compounding is used.
 248                  * Log the server error (once), but allow it and continue
 249                  * since the frame is parseable.
 250                  */
 251                 if (clc_len < len) {
 252                         printk_once(KERN_WARNING
 253                                 "SMB2 server sent bad RFC1001 len %d not %d\n",
 254                                 len, clc_len);
 255                         return 0;
 256                 }
 257
 258                 return 1;
 259         }
 260         return 0;
 261 }
 262
 263 /*
 264  * The size of the variable area depends on the offset and length fields
 265  * located in different fields for various SMB2 responses. SMB2 responses
 266  * with no variable length info, show an offset of zero for the offset field.
 267  */
 268 static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
 269         /* SMB2_NEGOTIATE */ true,
 270         /* SMB2_SESSION_SETUP */ true,
 271         /* SMB2_LOGOFF */ false,
 272         /* SMB2_TREE_CONNECT */ false,
 273         /* SMB2_TREE_DISCONNECT */ false,
 274         /* SMB2_CREATE */ true,
 275         /* SMB2_CLOSE */ false,
 276         /* SMB2_FLUSH */ false,
 277         /* SMB2_READ */ true,
 278         /* SMB2_WRITE */ false,
 279         /* SMB2_LOCK */ false,
 280         /* SMB2_IOCTL */ true,
 281         /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
 282         /* SMB2_ECHO */ false,
 283         /* SMB2_QUERY_DIRECTORY */ true,
 284         /* SMB2_CHANGE_NOTIFY */ true,
 285         /* SMB2_QUERY_INFO */ true,
 286         /* SMB2_SET_INFO */ false,
 287         /* SMB2_OPLOCK_BREAK */ false
 288 };
 289
 290 /*
 291  * Returns the pointer to the beginning of the data area. Length of the data
 292  * area and the offset to it (from the beginning of the smb are also returned.
 293  */
 294 char *
 295 smb2_get_data_area_len(int *off, int *len, struct smb2_sync_hdr *shdr)
 296 {
 297         *off = 0;
 298         *len = 0;
 299
 300         /* error responses do not have data area */
 301         if (shdr->Status && shdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
 302             (((struct smb2_err_rsp *)shdr)->StructureSize) ==
 303                                                 SMB2_ERROR_STRUCTURE_SIZE2)
 304                 return NULL;
 305
 306         /*
 307          * Following commands have data areas so we have to get the location
 308          * of the data buffer offset and data buffer length for the particular
 309          * command.
 310          */
 311         switch (shdr->Command) {
 312         case SMB2_NEGOTIATE:
 313                 *off = le16_to_cpu(
 314                   ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferOffset);
 315                 *len = le16_to_cpu(
 316                   ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferLength);
 317                 break;
 318         case SMB2_SESSION_SETUP:
 319                 *off = le16_to_cpu(
 320                   ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferOffset);
 321                 *len = le16_to_cpu(
 322                   ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferLength);
 323                 break;
 324         case SMB2_CREATE:
 325                 *off = le32_to_cpu(
 326                     ((struct smb2_create_rsp *)shdr)->CreateContextsOffset);
 327                 *len = le32_to_cpu(
 328                     ((struct smb2_create_rsp *)shdr)->CreateContextsLength);
 329                 break;
 330         case SMB2_QUERY_INFO:
 331                 *off = le16_to_cpu(
 332                     ((struct smb2_query_info_rsp *)shdr)->OutputBufferOffset);
 333                 *len = le32_to_cpu(
 334                     ((struct smb2_query_info_rsp *)shdr)->OutputBufferLength);
 335                 break;
 336         case SMB2_READ:
 337                 /* TODO: is this a bug ? */
 338                 *off = ((struct smb2_read_rsp *)shdr)->DataOffset;
 339                 *len = le32_to_cpu(((struct smb2_read_rsp *)shdr)->DataLength);
 340                 break;
 341         case SMB2_QUERY_DIRECTORY:
 342                 *off = le16_to_cpu(
 343                   ((struct smb2_query_directory_rsp *)shdr)->OutputBufferOffset);
 344                 *len = le32_to_cpu(
 345                   ((struct smb2_query_directory_rsp *)shdr)->OutputBufferLength);
 346                 break;
 347         case SMB2_IOCTL:
 348                 *off = le32_to_cpu(
 349                   ((struct smb2_ioctl_rsp *)shdr)->OutputOffset);
 350                 *len = le32_to_cpu(
 351                   ((struct smb2_ioctl_rsp *)shdr)->OutputCount);
 352                 break;
 353         case SMB2_CHANGE_NOTIFY:
 354         default:
 355                 /* BB FIXME for unimplemented cases above */
 356                 cifs_dbg(VFS, "no length check for command\n");
 357                 break;
 358         }
 359
 360         /*
 361          * Invalid length or offset probably means data area is invalid, but
 362          * we have little choice but to ignore the data area in this case.
 363          */
 364         if (*off > 4096) {
 365                 cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off);
 366                 *len = 0;
 367                 *off = 0;
 368         } else if (*off < 0) {
 369                 cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n",
 370                          *off);
 371                 *off = 0;
 372                 *len = 0;
 373         } else if (*len < 0) {
 374                 cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n",
 375                          *len);
 376                 *len = 0;
 377         } else if (*len > 128 * 1024) {
 378                 cifs_dbg(VFS, "data area larger than 128K: %d\n", *len);
 379                 *len = 0;
 380         }
 381
 382         /* return pointer to beginning of data area, ie offset from SMB start */
 383         if ((*off != 0) && (*len != 0))
 384                 return (char *)shdr + *off;
 385         else
 386                 return NULL;
 387 }
 388
 389 /*
 390  * Calculate the size of the SMB message based on the fixed header
 391  * portion, the number of word parameters and the data portion of the message.
 392  */
 393 unsigned int
 394 smb2_calc_size(void *buf, struct TCP_Server_Info *srvr)
 395 {
 396         struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)buf;
 397         struct smb2_sync_hdr *shdr = &pdu->sync_hdr;
 398         int offset; /* the offset from the beginning of SMB to data area */
 399         int data_length; /* the length of the variable length data area */
 400         /* Structure Size has already been checked to make sure it is 64 */
 401         int len = le16_to_cpu(shdr->StructureSize);
 402
 403         /*
 404          * StructureSize2, ie length of fixed parameter area has already
 405          * been checked to make sure it is the correct length.
 406          */
 407         len += le16_to_cpu(pdu->StructureSize2);
 408
 409         if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false)
 410                 goto calc_size_exit;
 411
 412         smb2_get_data_area_len(&offset, &data_length, shdr);
 413         cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset);
 414
 415         if (data_length > 0) {
 416                 /*
 417                  * Check to make sure that data area begins after fixed area,
 418                  * Note that last byte of the fixed area is part of data area
 419                  * for some commands, typically those with odd StructureSize,
 420                  * so we must add one to the calculation.
 421                  */
 422                 if (offset + 1 < len) {
 423                         cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n",
 424                                  offset + 1, len);
 425                         data_length = 0;
 426                 } else {
 427                         len = offset + data_length;
 428                 }
 429         }
 430 calc_size_exit:
 431         cifs_dbg(FYI, "SMB2 len %d\n", len);
 432         return len;
 433 }
 434
 435 /* Note: caller must free return buffer */
 436 __le16 *
 437 cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
 438 {
 439         int len;
 440         const char *start_of_path;
 441         __le16 *to;
 442         int map_type;
 443
 444         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
 445                 map_type = SFM_MAP_UNI_RSVD;
 446         else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 447                 map_type = SFU_MAP_UNI_RSVD;
 448         else
 449                 map_type = NO_MAP_UNI_RSVD;
 450
 451         /* Windows doesn't allow paths beginning with \ */
 452         if (from[0] == '\\')
 453                 start_of_path = from + 1;
 454 #ifdef CONFIG_CIFS_SMB311
 455         /* SMB311 POSIX extensions paths do not include leading slash */
 456         else if (cifs_sb_master_tlink(cifs_sb) &&
 457                  cifs_sb_master_tcon(cifs_sb)->posix_extensions &&
 458                  (from[0] == '/')) {
 459                 start_of_path = from + 1;
 460         }
 461 #endif /* 311 */
 462         else
 463                 start_of_path = from;
 464
 465         to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
 466                                    cifs_sb->local_nls, map_type);
 467         return to;
 468 }
 469
 470 __le32
 471 smb2_get_lease_state(struct cifsInodeInfo *cinode)
 472 {
 473         __le32 lease = 0;
 474
 475         if (CIFS_CACHE_WRITE(cinode))
 476                 lease |= SMB2_LEASE_WRITE_CACHING;
 477         if (CIFS_CACHE_HANDLE(cinode))
 478                 lease |= SMB2_LEASE_HANDLE_CACHING;
 479         if (CIFS_CACHE_READ(cinode))
 480                 lease |= SMB2_LEASE_READ_CACHING;
 481         return lease;
 482 }
 483
 484 struct smb2_lease_break_work {
 485         struct work_struct lease_break;
 486         struct tcon_link *tlink;
 487         __u8 lease_key[16];
 488         __le32 lease_state;
 489 };
 490
 491 static void
 492 cifs_ses_oplock_break(struct work_struct *work)
 493 {
 494         struct smb2_lease_break_work *lw = container_of(work,
 495                                 struct smb2_lease_break_work, lease_break);
 496         int rc = 0;
 497
 498         rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
 499                               lw->lease_state);
 500
 501         cifs_dbg(FYI, "Lease release rc %d\n", rc);
 502         cifs_put_tlink(lw->tlink);
 503         kfree(lw);
 504 }
 505
 506 static bool
 507 smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp,
 508                     struct smb2_lease_break_work *lw)
 509 {
 510         bool found;
 511         __u8 lease_state;
 512         struct list_head *tmp;
 513         struct cifsFileInfo *cfile;
 514         struct TCP_Server_Info *server = tcon->ses->server;
 515         struct cifs_pending_open *open;
 516         struct cifsInodeInfo *cinode;
 517         int ack_req = le32_to_cpu(rsp->Flags &
 518                                   SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
 519
 520         lease_state = le32_to_cpu(rsp->NewLeaseState);
 521
 522         list_for_each(tmp, &tcon->openFileList) {
 523                 cfile = list_entry(tmp, struct cifsFileInfo, tlist);
 524                 cinode = CIFS_I(d_inode(cfile->dentry));
 525
 526                 if (memcmp(cinode->lease_key, rsp->LeaseKey,
 527                                                         SMB2_LEASE_KEY_SIZE))
 528                         continue;
 529
 530                 cifs_dbg(FYI, "found in the open list\n");
 531                 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
 532                          le32_to_cpu(rsp->NewLeaseState));
 533
 534                 server->ops->set_oplock_level(cinode, lease_state, 0, NULL);
 535
 536                 if (ack_req)
 537                         cfile->oplock_break_cancelled = false;
 538                 else
 539                         cfile->oplock_break_cancelled = true;
 540
 541                 queue_work(cifsoplockd_wq, &cfile->oplock_break);
 542                 kfree(lw);
 543                 return true;
 544         }
 545
 546         found = false;
 547         list_for_each_entry(open, &tcon->pending_opens, olist) {
 548                 if (memcmp(open->lease_key, rsp->LeaseKey,
 549                            SMB2_LEASE_KEY_SIZE))
 550                         continue;
 551
 552                 if (!found && ack_req) {
 553                         found = true;
 554                         memcpy(lw->lease_key, open->lease_key,
 555                                SMB2_LEASE_KEY_SIZE);
 556                         lw->tlink = cifs_get_tlink(open->tlink);
 557                         queue_work(cifsiod_wq, &lw->lease_break);
 558                 }
 559
 560                 cifs_dbg(FYI, "found in the pending open list\n");
 561                 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
 562                          le32_to_cpu(rsp->NewLeaseState));
 563
 564                 open->oplock = lease_state;
 565         }
 566
 567         return found;
 568 }
 569
 570 static bool
 571 smb2_is_valid_lease_break(char *buffer)
 572 {
 573         struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
 574         struct list_head *tmp, *tmp1, *tmp2;
 575         struct TCP_Server_Info *server;
 576         struct cifs_ses *ses;
 577         struct cifs_tcon *tcon;
 578         struct smb2_lease_break_work *lw;
 579
 580         lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
 581         if (!lw)
 582                 return false;
 583
 584         INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
 585         lw->lease_state = rsp->NewLeaseState;
 586
 587         cifs_dbg(FYI, "Checking for lease break\n");
 588
 589         /* look up tcon based on tid & uid */
 590         spin_lock(&cifs_tcp_ses_lock);
 591         list_for_each(tmp, &cifs_tcp_ses_list) {
 592                 server = list_entry(tmp, struct TCP_Server_Info, tcp_ses_list);
 593
 594                 list_for_each(tmp1, &server->smb_ses_list) {
 595                         ses = list_entry(tmp1, struct cifs_ses, smb_ses_list);
 596
 597                         list_for_each(tmp2, &ses->tcon_list) {
 598                                 tcon = list_entry(tmp2, struct cifs_tcon,
 599                                                   tcon_list);
 600                                 spin_lock(&tcon->open_file_lock);
 601                                 cifs_stats_inc(
 602                                     &tcon->stats.cifs_stats.num_oplock_brks);
 603                                 if (smb2_tcon_has_lease(tcon, rsp, lw)) {
 604                                         spin_unlock(&tcon->open_file_lock);
 605                                         spin_unlock(&cifs_tcp_ses_lock);
 606                                         return true;
 607                                 }
 608                                 spin_unlock(&tcon->open_file_lock);
 609
 610                                 if (tcon->crfid.is_valid &&
 611                                     !memcmp(rsp->LeaseKey,
 612                                             tcon->crfid.fid->lease_key,
 613                                             SMB2_LEASE_KEY_SIZE)) {
 614                                         INIT_WORK(&tcon->crfid.lease_break,
 615                                                   smb2_cached_lease_break);
 616                                         queue_work(cifsiod_wq,
 617                                                    &tcon->crfid.lease_break);
 618                                         spin_unlock(&cifs_tcp_ses_lock);
 619                                         return true;
 620                                 }
 621                         }
 622                 }
 623         }
 624         spin_unlock(&cifs_tcp_ses_lock);
 625         kfree(lw);
 626         cifs_dbg(FYI, "Can not process lease break - no lease matched\n");
 627         return false;
 628 }
 629
 630 bool
 631 smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
 632 {
 633         struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer;
 634         struct list_head *tmp, *tmp1, *tmp2;
 635         struct cifs_ses *ses;
 636         struct cifs_tcon *tcon;
 637         struct cifsInodeInfo *cinode;
 638         struct cifsFileInfo *cfile;
 639
 640         cifs_dbg(FYI, "Checking for oplock break\n");
 641
 642         if (rsp->sync_hdr.Command != SMB2_OPLOCK_BREAK)
 643                 return false;
 644
 645         if (rsp->StructureSize !=
 646                                 smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
 647                 if (le16_to_cpu(rsp->StructureSize) == 44)
 648                         return smb2_is_valid_lease_break(buffer);
 649                 else
 650                         return false;
 651         }
 652
 653         cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel);
 654
 655         /* look up tcon based on tid & uid */
 656         spin_lock(&cifs_tcp_ses_lock);
 657         list_for_each(tmp, &server->smb_ses_list) {
 658                 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
 659                 list_for_each(tmp1, &ses->tcon_list) {
 660                         tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
 661
 662                         cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
 663                         spin_lock(&tcon->open_file_lock);
 664                         list_for_each(tmp2, &tcon->openFileList) {
 665                                 cfile = list_entry(tmp2, struct cifsFileInfo,
 666                                                      tlist);
 667                                 if (rsp->PersistentFid !=
 668                                     cfile->fid.persistent_fid ||
 669                                     rsp->VolatileFid !=
 670                                     cfile->fid.volatile_fid)
 671                                         continue;
 672
 673                                 cifs_dbg(FYI, "file id match, oplock break\n");
 674                                 cinode = CIFS_I(d_inode(cfile->dentry));
 675                                 spin_lock(&cfile->file_info_lock);
 676                                 if (!CIFS_CACHE_WRITE(cinode) &&
 677                                     rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
 678                                         cfile->oplock_break_cancelled = true;
 679                                 else
 680                                         cfile->oplock_break_cancelled = false;
 681
 682                                 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
 683                                         &cinode->flags);
 684
 685                                 /*
 686                                  * Set flag if the server downgrades the oplock
 687                                  * to L2 else clear.
 688                                  */
 689                                 if (rsp->OplockLevel)
 690                                         set_bit(
 691                                            CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
 692                                            &cinode->flags);
 693                                 else
 694                                         clear_bit(
 695                                            CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
 696                                            &cinode->flags);
 697                                 spin_unlock(&cfile->file_info_lock);
 698                                 queue_work(cifsoplockd_wq,
 699                                            &cfile->oplock_break);
 700
 701                                 spin_unlock(&tcon->open_file_lock);
 702                                 spin_unlock(&cifs_tcp_ses_lock);
 703                                 return true;
 704                         }
 705                         spin_unlock(&tcon->open_file_lock);
 706                         spin_unlock(&cifs_tcp_ses_lock);
 707                         cifs_dbg(FYI, "No matching file for oplock break\n");
 708                         return true;
 709                 }
 710         }
 711         spin_unlock(&cifs_tcp_ses_lock);
 712         cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
 713         return false;
 714 }
 715
 716 void
 717 smb2_cancelled_close_fid(struct work_struct *work)
 718 {
 719         struct close_cancelled_open *cancelled = container_of(work,
 720                                         struct close_cancelled_open, work);
 721
 722         cifs_dbg(VFS, "Close unmatched open\n");
 723
 724         SMB2_close(0, cancelled->tcon, cancelled->fid.persistent_fid,
 725                    cancelled->fid.volatile_fid);
 726         cifs_put_tcon(cancelled->tcon);
 727         kfree(cancelled);
 728 }
 729
 730 int
 731 smb2_handle_cancelled_mid(char *buffer, struct TCP_Server_Info *server)
 732 {
 733         struct smb2_sync_hdr *sync_hdr = (struct smb2_sync_hdr *)buffer;
 734         struct smb2_create_rsp *rsp = (struct smb2_create_rsp *)buffer;
 735         struct cifs_tcon *tcon;
 736         struct close_cancelled_open *cancelled;
 737
 738         if (sync_hdr->Command != SMB2_CREATE ||
 739             sync_hdr->Status != STATUS_SUCCESS)
 740                 return 0;
 741
 742         cancelled = kzalloc(sizeof(*cancelled), GFP_KERNEL);
 743         if (!cancelled)
 744                 return -ENOMEM;
 745
 746         tcon = smb2_find_smb_tcon(server, sync_hdr->SessionId,
 747                                   sync_hdr->TreeId);
 748         if (!tcon) {
 749                 kfree(cancelled);
 750                 return -ENOENT;
 751         }
 752
 753         cancelled->fid.persistent_fid = rsp->PersistentFileId;
 754         cancelled->fid.volatile_fid = rsp->VolatileFileId;
 755         cancelled->tcon = tcon;
 756         INIT_WORK(&cancelled->work, smb2_cancelled_close_fid);
 757         queue_work(cifsiod_wq, &cancelled->work);
 758
 759         return 0;
 760 }
 761
 762 #ifdef CONFIG_CIFS_SMB311
 763 /**
 764  * smb311_update_preauth_hash - update @ses hash with the packet data in @iov
 765  *
 766  * Assumes @iov does not contain the rfc1002 length and iov[0] has the
 767  * SMB2 header.
 768  */
 769 int
 770 smb311_update_preauth_hash(struct cifs_ses *ses, struct kvec *iov, int nvec)
 771 {
 772         int i, rc;
 773         struct sdesc *d;
 774         struct smb2_sync_hdr *hdr;
 775
 776         if (ses->server->tcpStatus == CifsGood) {
 777                 /* skip non smb311 connections */
 778                 if (ses->server->dialect != SMB311_PROT_ID)
 779                         return 0;
 780
 781                 /* skip last sess setup response */
 782                 hdr = (struct smb2_sync_hdr *)iov[0].iov_base;
 783                 if (hdr->Flags & SMB2_FLAGS_SIGNED)
 784                         return 0;
 785         }
 786
 787         rc = smb311_crypto_shash_allocate(ses->server);
 788         if (rc)
 789                 return rc;
 790
 791         d = ses->server->secmech.sdescsha512;
 792         rc = crypto_shash_init(&d->shash);
 793         if (rc) {
 794                 cifs_dbg(VFS, "%s: could not init sha512 shash\n", __func__);
 795                 return rc;
 796         }
 797
 798         rc = crypto_shash_update(&d->shash, ses->preauth_sha_hash,
 799                                  SMB2_PREAUTH_HASH_SIZE);
 800         if (rc) {
 801                 cifs_dbg(VFS, "%s: could not update sha512 shash\n", __func__);
 802                 return rc;
 803         }
 804
 805         for (i = 0; i < nvec; i++) {
 806                 rc = crypto_shash_update(&d->shash,
 807                                          iov[i].iov_base, iov[i].iov_len);
 808                 if (rc) {
 809                         cifs_dbg(VFS, "%s: could not update sha512 shash\n",
 810                                  __func__);
 811                         return rc;
 812                 }
 813         }
 814
 815         rc = crypto_shash_final(&d->shash, ses->preauth_sha_hash);
 816         if (rc) {
 817                 cifs_dbg(VFS, "%s: could not finalize sha512 shash\n",
 818                          __func__);
 819                 return rc;
 820         }
 821
 822         return 0;
 823 }
 824 #endif