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 (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 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 static __u32 get_neg_ctxt_len(struct smb2_sync_hdr *hdr, __u32 len,
  97                               __u32 non_ctxlen)
  98 {
  99         __u16 neg_count;
 100         __u32 nc_offset, size_of_pad_before_neg_ctxts;
 101         struct smb2_negotiate_rsp *pneg_rsp = (struct smb2_negotiate_rsp *)hdr;
 102
 103         /* Negotiate contexts are only valid for latest dialect SMB3.11 */
 104         neg_count = le16_to_cpu(pneg_rsp->NegotiateContextCount);
 105         if ((neg_count == 0) ||
 106            (pneg_rsp->DialectRevision != cpu_to_le16(SMB311_PROT_ID)))
 107                 return 0;
 108
 109         /* Make sure that negotiate contexts start after gss security blob */
 110         nc_offset = le32_to_cpu(pneg_rsp->NegotiateContextOffset);
 111         if (nc_offset < non_ctxlen) {
 112                 printk_once(KERN_WARNING "invalid negotiate context offset\n");
 113                 return 0;
 114         }
 115         size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen;
 116
 117         /* Verify that at least minimal negotiate contexts fit within frame */
 118         if (len < nc_offset + (neg_count * sizeof(struct smb2_neg_context))) {
 119                 printk_once(KERN_WARNING "negotiate context goes beyond end\n");
 120                 return 0;
 121         }
 122
 123         cifs_dbg(FYI, "length of negcontexts %d pad %d\n",
 124                 len - nc_offset, size_of_pad_before_neg_ctxts);
 125
 126         /* length of negcontexts including pad from end of sec blob to them */
 127         return (len - nc_offset) + size_of_pad_before_neg_ctxts;
 128 }
 129
 130 int
 131 smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *srvr)
 132 {
 133         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
 134         struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)shdr;
 135         __u64 mid;
 136         __u32 clc_len;  /* calculated length */
 137         int command;
 138         int pdu_size = sizeof(struct smb2_sync_pdu);
 139         int hdr_size = sizeof(struct smb2_sync_hdr);
 140
 141         /*
 142          * Add function to do table lookup of StructureSize by command
 143          * ie Validate the wct via smb2_struct_sizes table above
 144          */
 145         if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
 146                 struct smb2_transform_hdr *thdr =
 147                         (struct smb2_transform_hdr *)buf;
 148                 struct cifs_ses *ses = NULL;
 149                 struct list_head *tmp;
 150
 151                 /* decrypt frame now that it is completely read in */
 152                 spin_lock(&cifs_tcp_ses_lock);
 153                 list_for_each(tmp, &srvr->smb_ses_list) {
 154                         ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
 155                         if (ses->Suid == thdr->SessionId)
 156                                 break;
 157
 158                         ses = NULL;
 159                 }
 160                 spin_unlock(&cifs_tcp_ses_lock);
 161                 if (ses == NULL) {
 162                         cifs_dbg(VFS, "no decryption - session id not found\n");
 163                         return 1;
 164                 }
 165         }
 166
 167         mid = le64_to_cpu(shdr->MessageId);
 168         if (len < pdu_size) {
 169                 if ((len >= hdr_size)
 170                     && (shdr->Status != 0)) {
 171                         pdu->StructureSize2 = 0;
 172                         /*
 173                          * As with SMB/CIFS, on some error cases servers may
 174                          * not return wct properly
 175                          */
 176                         return 0;
 177                 } else {
 178                         cifs_dbg(VFS, "Length less than SMB header size\n");
 179                 }
 180                 return 1;
 181         }
 182         if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE) {
 183                 cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n",
 184                          mid);
 185                 return 1;
 186         }
 187
 188         if (check_smb2_hdr(shdr, mid))
 189                 return 1;
 190
 191         if (shdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
 192                 cifs_dbg(VFS, "Illegal structure size %u\n",
 193                          le16_to_cpu(shdr->StructureSize));
 194                 return 1;
 195         }
 196
 197         command = le16_to_cpu(shdr->Command);
 198         if (command >= NUMBER_OF_SMB2_COMMANDS) {
 199                 cifs_dbg(VFS, "Illegal SMB2 command %d\n", command);
 200                 return 1;
 201         }
 202
 203         if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
 204                 if (command != SMB2_OPLOCK_BREAK_HE && (shdr->Status == 0 ||
 205                     pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) {
 206                         /* error packets have 9 byte structure size */
 207                         cifs_dbg(VFS, "Illegal response size %u for command %d\n",
 208                                  le16_to_cpu(pdu->StructureSize2), command);
 209                         return 1;
 210                 } else if (command == SMB2_OPLOCK_BREAK_HE
 211                            && (shdr->Status == 0)
 212                            && (le16_to_cpu(pdu->StructureSize2) != 44)
 213                            && (le16_to_cpu(pdu->StructureSize2) != 36)) {
 214                         /* special case for SMB2.1 lease break message */
 215                         cifs_dbg(VFS, "Illegal response size %d for oplock break\n",
 216                                  le16_to_cpu(pdu->StructureSize2));
 217                         return 1;
 218                 }
 219         }
 220
 221         clc_len = smb2_calc_size(buf, srvr);
 222
 223         if (shdr->Command == SMB2_NEGOTIATE)
 224                 clc_len += get_neg_ctxt_len(shdr, len, clc_len);
 225
 226         if (len != clc_len) {
 227                 cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n",
 228                          clc_len, len, mid);
 229                 /* create failed on symlink */
 230                 if (command == SMB2_CREATE_HE &&
 231                     shdr->Status == STATUS_STOPPED_ON_SYMLINK)
 232                         return 0;
 233                 /* Windows 7 server returns 24 bytes more */
 234                 if (clc_len + 24 == len && command == SMB2_OPLOCK_BREAK_HE)
 235                         return 0;
 236                 /* server can return one byte more due to implied bcc[0] */
 237                 if (clc_len == len + 1)
 238                         return 0;
 239
 240                 /*
 241                  * Some windows servers (win2016) will pad also the final
 242                  * PDU in a compound to 8 bytes.
 243                  */
 244                 if (((clc_len + 7) & ~7) == len)
 245                         return 0;
 246
 247                 /*
 248                  * MacOS server pads after SMB2.1 write response with 3 bytes
 249                  * of junk. Other servers match RFC1001 len to actual
 250                  * SMB2/SMB3 frame length (header + smb2 response specific data)
 251                  * Some windows servers do too when compounding is used.
 252                  * Log the server error (once), but allow it and continue
 253                  * since the frame is parseable.
 254                  */
 255                 if (clc_len < len) {
 256                         printk_once(KERN_WARNING
 257                                 "SMB2 server sent bad RFC1001 len %d not %d\n",
 258                                 len, clc_len);
 259                         return 0;
 260                 }
 261
 262                 return 1;
 263         }
 264         return 0;
 265 }
 266
 267 /*
 268  * The size of the variable area depends on the offset and length fields
 269  * located in different fields for various SMB2 responses. SMB2 responses
 270  * with no variable length info, show an offset of zero for the offset field.
 271  */
 272 static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
 273         /* SMB2_NEGOTIATE */ true,
 274         /* SMB2_SESSION_SETUP */ true,
 275         /* SMB2_LOGOFF */ false,
 276         /* SMB2_TREE_CONNECT */ false,
 277         /* SMB2_TREE_DISCONNECT */ false,
 278         /* SMB2_CREATE */ true,
 279         /* SMB2_CLOSE */ false,
 280         /* SMB2_FLUSH */ false,
 281         /* SMB2_READ */ true,
 282         /* SMB2_WRITE */ false,
 283         /* SMB2_LOCK */ false,
 284         /* SMB2_IOCTL */ true,
 285         /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
 286         /* SMB2_ECHO */ false,
 287         /* SMB2_QUERY_DIRECTORY */ true,
 288         /* SMB2_CHANGE_NOTIFY */ true,
 289         /* SMB2_QUERY_INFO */ true,
 290         /* SMB2_SET_INFO */ false,
 291         /* SMB2_OPLOCK_BREAK */ false
 292 };
 293
 294 /*
 295  * Returns the pointer to the beginning of the data area. Length of the data
 296  * area and the offset to it (from the beginning of the smb are also returned.
 297  */
 298 char *
 299 smb2_get_data_area_len(int *off, int *len, struct smb2_sync_hdr *shdr)
 300 {
 301         *off = 0;
 302         *len = 0;
 303
 304         /* error responses do not have data area */
 305         if (shdr->Status && shdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
 306             (((struct smb2_err_rsp *)shdr)->StructureSize) ==
 307                                                 SMB2_ERROR_STRUCTURE_SIZE2)
 308                 return NULL;
 309
 310         /*
 311          * Following commands have data areas so we have to get the location
 312          * of the data buffer offset and data buffer length for the particular
 313          * command.
 314          */
 315         switch (shdr->Command) {
 316         case SMB2_NEGOTIATE:
 317                 *off = le16_to_cpu(
 318                   ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferOffset);
 319                 *len = le16_to_cpu(
 320                   ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferLength);
 321                 break;
 322         case SMB2_SESSION_SETUP:
 323                 *off = le16_to_cpu(
 324                   ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferOffset);
 325                 *len = le16_to_cpu(
 326                   ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferLength);
 327                 break;
 328         case SMB2_CREATE:
 329                 *off = le32_to_cpu(
 330                     ((struct smb2_create_rsp *)shdr)->CreateContextsOffset);
 331                 *len = le32_to_cpu(
 332                     ((struct smb2_create_rsp *)shdr)->CreateContextsLength);
 333                 break;
 334         case SMB2_QUERY_INFO:
 335                 *off = le16_to_cpu(
 336                     ((struct smb2_query_info_rsp *)shdr)->OutputBufferOffset);
 337                 *len = le32_to_cpu(
 338                     ((struct smb2_query_info_rsp *)shdr)->OutputBufferLength);
 339                 break;
 340         case SMB2_READ:
 341                 /* TODO: is this a bug ? */
 342                 *off = ((struct smb2_read_rsp *)shdr)->DataOffset;
 343                 *len = le32_to_cpu(((struct smb2_read_rsp *)shdr)->DataLength);
 344                 break;
 345         case SMB2_QUERY_DIRECTORY:
 346                 *off = le16_to_cpu(
 347                   ((struct smb2_query_directory_rsp *)shdr)->OutputBufferOffset);
 348                 *len = le32_to_cpu(
 349                   ((struct smb2_query_directory_rsp *)shdr)->OutputBufferLength);
 350                 break;
 351         case SMB2_IOCTL:
 352                 *off = le32_to_cpu(
 353                   ((struct smb2_ioctl_rsp *)shdr)->OutputOffset);
 354                 *len = le32_to_cpu(
 355                   ((struct smb2_ioctl_rsp *)shdr)->OutputCount);
 356                 break;
 357         case SMB2_CHANGE_NOTIFY:
 358         default:
 359                 /* BB FIXME for unimplemented cases above */
 360                 cifs_dbg(VFS, "no length check for command\n");
 361                 break;
 362         }
 363
 364         /*
 365          * Invalid length or offset probably means data area is invalid, but
 366          * we have little choice but to ignore the data area in this case.
 367          */
 368         if (*off > 4096) {
 369                 cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off);
 370                 *len = 0;
 371                 *off = 0;
 372         } else if (*off < 0) {
 373                 cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n",
 374                          *off);
 375                 *off = 0;
 376                 *len = 0;
 377         } else if (*len < 0) {
 378                 cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n",
 379                          *len);
 380                 *len = 0;
 381         } else if (*len > 128 * 1024) {
 382                 cifs_dbg(VFS, "data area larger than 128K: %d\n", *len);
 383                 *len = 0;
 384         }
 385
 386         /* return pointer to beginning of data area, ie offset from SMB start */
 387         if ((*off != 0) && (*len != 0))
 388                 return (char *)shdr + *off;
 389         else
 390                 return NULL;
 391 }
 392
 393 /*
 394  * Calculate the size of the SMB message based on the fixed header
 395  * portion, the number of word parameters and the data portion of the message.
 396  */
 397 unsigned int
 398 smb2_calc_size(void *buf, struct TCP_Server_Info *srvr)
 399 {
 400         struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)buf;
 401         struct smb2_sync_hdr *shdr = &pdu->sync_hdr;
 402         int offset; /* the offset from the beginning of SMB to data area */
 403         int data_length; /* the length of the variable length data area */
 404         /* Structure Size has already been checked to make sure it is 64 */
 405         int len = le16_to_cpu(shdr->StructureSize);
 406
 407         /*
 408          * StructureSize2, ie length of fixed parameter area has already
 409          * been checked to make sure it is the correct length.
 410          */
 411         len += le16_to_cpu(pdu->StructureSize2);
 412
 413         if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false)
 414                 goto calc_size_exit;
 415
 416         smb2_get_data_area_len(&offset, &data_length, shdr);
 417         cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset);
 418
 419         if (data_length > 0) {
 420                 /*
 421                  * Check to make sure that data area begins after fixed area,
 422                  * Note that last byte of the fixed area is part of data area
 423                  * for some commands, typically those with odd StructureSize,
 424                  * so we must add one to the calculation.
 425                  */
 426                 if (offset + 1 < len) {
 427                         cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n",
 428                                  offset + 1, len);
 429                         data_length = 0;
 430                 } else {
 431                         len = offset + data_length;
 432                 }
 433         }
 434 calc_size_exit:
 435         cifs_dbg(FYI, "SMB2 len %d\n", len);
 436         return len;
 437 }
 438
 439 /* Note: caller must free return buffer */
 440 __le16 *
 441 cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
 442 {
 443         int len;
 444         const char *start_of_path;
 445         __le16 *to;
 446         int map_type;
 447
 448         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
 449                 map_type = SFM_MAP_UNI_RSVD;
 450         else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 451                 map_type = SFU_MAP_UNI_RSVD;
 452         else
 453                 map_type = NO_MAP_UNI_RSVD;
 454
 455         /* Windows doesn't allow paths beginning with \ */
 456         if (from[0] == '\\')
 457                 start_of_path = from + 1;
 458
 459         /* SMB311 POSIX extensions paths do not include leading slash */
 460         else if (cifs_sb_master_tlink(cifs_sb) &&
 461                  cifs_sb_master_tcon(cifs_sb)->posix_extensions &&
 462                  (from[0] == '/')) {
 463                 start_of_path = from + 1;
 464         } else
 465                 start_of_path = from;
 466
 467         to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
 468                                    cifs_sb->local_nls, map_type);
 469         return to;
 470 }
 471
 472 __le32
 473 smb2_get_lease_state(struct cifsInodeInfo *cinode)
 474 {
 475         __le32 lease = 0;
 476
 477         if (CIFS_CACHE_WRITE(cinode))
 478                 lease |= SMB2_LEASE_WRITE_CACHING;
 479         if (CIFS_CACHE_HANDLE(cinode))
 480                 lease |= SMB2_LEASE_HANDLE_CACHING;
 481         if (CIFS_CACHE_READ(cinode))
 482                 lease |= SMB2_LEASE_READ_CACHING;
 483         return lease;
 484 }
 485
 486 struct smb2_lease_break_work {
 487         struct work_struct lease_break;
 488         struct tcon_link *tlink;
 489         __u8 lease_key[16];
 490         __le32 lease_state;
 491 };
 492
 493 static void
 494 cifs_ses_oplock_break(struct work_struct *work)
 495 {
 496         struct smb2_lease_break_work *lw = container_of(work,
 497                                 struct smb2_lease_break_work, lease_break);
 498         int rc = 0;
 499
 500         rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
 501                               lw->lease_state);
 502
 503         cifs_dbg(FYI, "Lease release rc %d\n", rc);
 504         cifs_put_tlink(lw->tlink);
 505         kfree(lw);
 506 }
 507
 508 static bool
 509 smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp,
 510                     struct smb2_lease_break_work *lw)
 511 {
 512         bool found;
 513         __u8 lease_state;
 514         struct list_head *tmp;
 515         struct cifsFileInfo *cfile;
 516         struct TCP_Server_Info *server = tcon->ses->server;
 517         struct cifs_pending_open *open;
 518         struct cifsInodeInfo *cinode;
 519         int ack_req = le32_to_cpu(rsp->Flags &
 520                                   SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
 521
 522         lease_state = le32_to_cpu(rsp->NewLeaseState);
 523
 524         list_for_each(tmp, &tcon->openFileList) {
 525                 cfile = list_entry(tmp, struct cifsFileInfo, tlist);
 526                 cinode = CIFS_I(d_inode(cfile->dentry));
 527
 528                 if (memcmp(cinode->lease_key, rsp->LeaseKey,
 529                                                         SMB2_LEASE_KEY_SIZE))
 530                         continue;
 531
 532                 cifs_dbg(FYI, "found in the open list\n");
 533                 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
 534                          le32_to_cpu(rsp->NewLeaseState));
 535
 536                 server->ops->set_oplock_level(cinode, lease_state, 0, NULL);
 537
 538                 if (ack_req)
 539                         cfile->oplock_break_cancelled = false;
 540                 else
 541                         cfile->oplock_break_cancelled = true;
 542
 543                 queue_work(cifsoplockd_wq, &cfile->oplock_break);
 544                 kfree(lw);
 545                 return true;
 546         }
 547
 548         found = false;
 549         list_for_each_entry(open, &tcon->pending_opens, olist) {
 550                 if (memcmp(open->lease_key, rsp->LeaseKey,
 551                            SMB2_LEASE_KEY_SIZE))
 552                         continue;
 553
 554                 if (!found && ack_req) {
 555                         found = true;
 556                         memcpy(lw->lease_key, open->lease_key,
 557                                SMB2_LEASE_KEY_SIZE);
 558                         lw->tlink = cifs_get_tlink(open->tlink);
 559                         queue_work(cifsiod_wq, &lw->lease_break);
 560                 }
 561
 562                 cifs_dbg(FYI, "found in the pending open list\n");
 563                 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
 564                          le32_to_cpu(rsp->NewLeaseState));
 565
 566                 open->oplock = lease_state;
 567         }
 568
 569         return found;
 570 }
 571
 572 static bool
 573 smb2_is_valid_lease_break(char *buffer)
 574 {
 575         struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
 576         struct list_head *tmp, *tmp1, *tmp2;
 577         struct TCP_Server_Info *server;
 578         struct cifs_ses *ses;
 579         struct cifs_tcon *tcon;
 580         struct smb2_lease_break_work *lw;
 581
 582         lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
 583         if (!lw)
 584                 return false;
 585
 586         INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
 587         lw->lease_state = rsp->NewLeaseState;
 588
 589         cifs_dbg(FYI, "Checking for lease break\n");
 590
 591         /* look up tcon based on tid & uid */
 592         spin_lock(&cifs_tcp_ses_lock);
 593         list_for_each(tmp, &cifs_tcp_ses_list) {
 594                 server = list_entry(tmp, struct TCP_Server_Info, tcp_ses_list);
 595
 596                 list_for_each(tmp1, &server->smb_ses_list) {
 597                         ses = list_entry(tmp1, struct cifs_ses, smb_ses_list);
 598
 599                         list_for_each(tmp2, &ses->tcon_list) {
 600                                 tcon = list_entry(tmp2, struct cifs_tcon,
 601                                                   tcon_list);
 602                                 spin_lock(&tcon->open_file_lock);
 603                                 cifs_stats_inc(
 604                                     &tcon->stats.cifs_stats.num_oplock_brks);
 605                                 if (smb2_tcon_has_lease(tcon, rsp, lw)) {
 606                                         spin_unlock(&tcon->open_file_lock);
 607                                         spin_unlock(&cifs_tcp_ses_lock);
 608                                         return true;
 609                                 }
 610                                 spin_unlock(&tcon->open_file_lock);
 611
 612                                 if (tcon->crfid.is_valid &&
 613                                     !memcmp(rsp->LeaseKey,
 614                                             tcon->crfid.fid->lease_key,
 615                                             SMB2_LEASE_KEY_SIZE)) {
 616                                         INIT_WORK(&tcon->crfid.lease_break,
 617                                                   smb2_cached_lease_break);
 618                                         queue_work(cifsiod_wq,
 619                                                    &tcon->crfid.lease_break);
 620                                         spin_unlock(&cifs_tcp_ses_lock);
 621                                         return true;
 622                                 }
 623                         }
 624                 }
 625         }
 626         spin_unlock(&cifs_tcp_ses_lock);
 627         kfree(lw);
 628         cifs_dbg(FYI, "Can not process lease break - no lease matched\n");
 629         return false;
 630 }
 631
 632 bool
 633 smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
 634 {
 635         struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer;
 636         struct list_head *tmp, *tmp1, *tmp2;
 637         struct cifs_ses *ses;
 638         struct cifs_tcon *tcon;
 639         struct cifsInodeInfo *cinode;
 640         struct cifsFileInfo *cfile;
 641
 642         cifs_dbg(FYI, "Checking for oplock break\n");
 643
 644         if (rsp->sync_hdr.Command != SMB2_OPLOCK_BREAK)
 645                 return false;
 646
 647         if (rsp->StructureSize !=
 648                                 smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
 649                 if (le16_to_cpu(rsp->StructureSize) == 44)
 650                         return smb2_is_valid_lease_break(buffer);
 651                 else
 652                         return false;
 653         }
 654
 655         cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel);
 656
 657         /* look up tcon based on tid & uid */
 658         spin_lock(&cifs_tcp_ses_lock);
 659         list_for_each(tmp, &server->smb_ses_list) {
 660                 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
 661                 list_for_each(tmp1, &ses->tcon_list) {
 662                         tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
 663
 664                         cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
 665                         spin_lock(&tcon->open_file_lock);
 666                         list_for_each(tmp2, &tcon->openFileList) {
 667                                 cfile = list_entry(tmp2, struct cifsFileInfo,
 668                                                      tlist);
 669                                 if (rsp->PersistentFid !=
 670                                     cfile->fid.persistent_fid ||
 671                                     rsp->VolatileFid !=
 672                                     cfile->fid.volatile_fid)
 673                                         continue;
 674
 675                                 cifs_dbg(FYI, "file id match, oplock break\n");
 676                                 cinode = CIFS_I(d_inode(cfile->dentry));
 677                                 spin_lock(&cfile->file_info_lock);
 678                                 if (!CIFS_CACHE_WRITE(cinode) &&
 679                                     rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
 680                                         cfile->oplock_break_cancelled = true;
 681                                 else
 682                                         cfile->oplock_break_cancelled = false;
 683
 684                                 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
 685                                         &cinode->flags);
 686
 687                                 /*
 688                                  * Set flag if the server downgrades the oplock
 689                                  * to L2 else clear.
 690                                  */
 691                                 if (rsp->OplockLevel)
 692                                         set_bit(
 693                                            CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
 694                                            &cinode->flags);
 695                                 else
 696                                         clear_bit(
 697                                            CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
 698                                            &cinode->flags);
 699                                 spin_unlock(&cfile->file_info_lock);
 700                                 queue_work(cifsoplockd_wq,
 701                                            &cfile->oplock_break);
 702
 703                                 spin_unlock(&tcon->open_file_lock);
 704                                 spin_unlock(&cifs_tcp_ses_lock);
 705                                 return true;
 706                         }
 707                         spin_unlock(&tcon->open_file_lock);
 708                         spin_unlock(&cifs_tcp_ses_lock);
 709                         cifs_dbg(FYI, "No matching file for oplock break\n");
 710                         return true;
 711                 }
 712         }
 713         spin_unlock(&cifs_tcp_ses_lock);
 714         cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
 715         return false;
 716 }
 717
 718 void
 719 smb2_cancelled_close_fid(struct work_struct *work)
 720 {
 721         struct close_cancelled_open *cancelled = container_of(work,
 722                                         struct close_cancelled_open, work);
 723
 724         cifs_dbg(VFS, "Close unmatched open\n");
 725
 726         SMB2_close(0, cancelled->tcon, cancelled->fid.persistent_fid,
 727                    cancelled->fid.volatile_fid);
 728         cifs_put_tcon(cancelled->tcon);
 729         kfree(cancelled);
 730 }
 731
 732 int
 733 smb2_handle_cancelled_mid(char *buffer, struct TCP_Server_Info *server)
 734 {
 735         struct smb2_sync_hdr *sync_hdr = (struct smb2_sync_hdr *)buffer;
 736         struct smb2_create_rsp *rsp = (struct smb2_create_rsp *)buffer;
 737         struct cifs_tcon *tcon;
 738         struct close_cancelled_open *cancelled;
 739
 740         if (sync_hdr->Command != SMB2_CREATE ||
 741             sync_hdr->Status != STATUS_SUCCESS)
 742                 return 0;
 743
 744         cancelled = kzalloc(sizeof(*cancelled), GFP_KERNEL);
 745         if (!cancelled)
 746                 return -ENOMEM;
 747
 748         tcon = smb2_find_smb_tcon(server, sync_hdr->SessionId,
 749                                   sync_hdr->TreeId);
 750         if (!tcon) {
 751                 kfree(cancelled);
 752                 return -ENOENT;
 753         }
 754
 755         cancelled->fid.persistent_fid = rsp->PersistentFileId;
 756         cancelled->fid.volatile_fid = rsp->VolatileFileId;
 757         cancelled->tcon = tcon;
 758         INIT_WORK(&cancelled->work, smb2_cancelled_close_fid);
 759         queue_work(cifsiod_wq, &cancelled->work);
 760
 761         return 0;
 762 }
 763
 764 /**
 765  * smb311_update_preauth_hash - update @ses hash with the packet data in @iov
 766  *
 767  * Assumes @iov does not contain the rfc1002 length and iov[0] has the
 768  * SMB2 header.
 769  */
 770 int
 771 smb311_update_preauth_hash(struct cifs_ses *ses, struct kvec *iov, int nvec)
 772 {
 773         int i, rc;
 774         struct sdesc *d;
 775         struct smb2_sync_hdr *hdr;
 776
 777         if (ses->server->tcpStatus == CifsGood) {
 778                 /* skip non smb311 connections */
 779                 if (ses->server->dialect != SMB311_PROT_ID)
 780                         return 0;
 781
 782                 /* skip last sess setup response */
 783                 hdr = (struct smb2_sync_hdr *)iov[0].iov_base;
 784                 if (hdr->Flags & SMB2_FLAGS_SIGNED)
 785                         return 0;
 786         }
 787
 788         rc = smb311_crypto_shash_allocate(ses->server);
 789         if (rc)
 790                 return rc;
 791
 792         d = ses->server->secmech.sdescsha512;
 793         rc = crypto_shash_init(&d->shash);
 794         if (rc) {
 795                 cifs_dbg(VFS, "%s: could not init sha512 shash\n", __func__);
 796                 return rc;
 797         }
 798
 799         rc = crypto_shash_update(&d->shash, ses->preauth_sha_hash,
 800                                  SMB2_PREAUTH_HASH_SIZE);
 801         if (rc) {
 802                 cifs_dbg(VFS, "%s: could not update sha512 shash\n", __func__);
 803                 return rc;
 804         }
 805
 806         for (i = 0; i < nvec; i++) {
 807                 rc = crypto_shash_update(&d->shash,
 808                                          iov[i].iov_base, iov[i].iov_len);
 809                 if (rc) {
 810                         cifs_dbg(VFS, "%s: could not update sha512 shash\n",
 811                                  __func__);
 812                         return rc;
 813                 }
 814         }
 815
 816         rc = crypto_shash_final(&d->shash, ses->preauth_sha_hash);
 817         if (rc) {
 818                 cifs_dbg(VFS, "%s: could not finalize sha512 shash\n",
 819                          __func__);
 820                 return rc;
 821         }
 822
 823         return 0;
 824 }