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 int
  97 smb2_check_message(char *buf, unsigned int length, struct TCP_Server_Info *srvr)
  98 {
  99         struct smb2_pdu *pdu = (struct smb2_pdu *)buf;
 100         struct smb2_hdr *hdr = &pdu->hdr;
 101         struct smb2_sync_hdr *shdr = get_sync_hdr(buf);
 102         __u64 mid;
 103         __u32 len = get_rfc1002_length(buf);
 104         __u32 clc_len;  /* calculated length */
 105         int command;
 106
 107         /* BB disable following printk later */
 108         cifs_dbg(FYI, "%s length: 0x%x, smb_buf_length: 0x%x\n",
 109                  __func__, length, len);
 110
 111         /*
 112          * Add function to do table lookup of StructureSize by command
 113          * ie Validate the wct via smb2_struct_sizes table above
 114          */
 115
 116         if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
 117                 struct smb2_transform_hdr *thdr =
 118                         (struct smb2_transform_hdr *)buf;
 119                 struct cifs_ses *ses = NULL;
 120                 struct list_head *tmp;
 121
 122                 /* decrypt frame now that it is completely read in */
 123                 spin_lock(&cifs_tcp_ses_lock);
 124                 list_for_each(tmp, &srvr->smb_ses_list) {
 125                         ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
 126                         if (ses->Suid == thdr->SessionId)
 127                                 break;
 128
 129                         ses = NULL;
 130                 }
 131                 spin_unlock(&cifs_tcp_ses_lock);
 132                 if (ses == NULL) {
 133                         cifs_dbg(VFS, "no decryption - session id not found\n");
 134                         return 1;
 135                 }
 136         }
 137
 138         mid = le64_to_cpu(shdr->MessageId);
 139         if (length < sizeof(struct smb2_pdu)) {
 140                 if ((length >= sizeof(struct smb2_hdr))
 141                     && (shdr->Status != 0)) {
 142                         pdu->StructureSize2 = 0;
 143                         /*
 144                          * As with SMB/CIFS, on some error cases servers may
 145                          * not return wct properly
 146                          */
 147                         return 0;
 148                 } else {
 149                         cifs_dbg(VFS, "Length less than SMB header size\n");
 150                 }
 151                 return 1;
 152         }
 153         if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE -
 154             srvr->vals->header_preamble_size) {
 155                 cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n",
 156                          mid);
 157                 return 1;
 158         }
 159
 160         if (check_smb2_hdr(shdr, mid))
 161                 return 1;
 162
 163         if (shdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
 164                 cifs_dbg(VFS, "Illegal structure size %u\n",
 165                          le16_to_cpu(shdr->StructureSize));
 166                 return 1;
 167         }
 168
 169         command = le16_to_cpu(shdr->Command);
 170         if (command >= NUMBER_OF_SMB2_COMMANDS) {
 171                 cifs_dbg(VFS, "Illegal SMB2 command %d\n", command);
 172                 return 1;
 173         }
 174
 175         if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
 176                 if (command != SMB2_OPLOCK_BREAK_HE && (shdr->Status == 0 ||
 177                     pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) {
 178                         /* error packets have 9 byte structure size */
 179                         cifs_dbg(VFS, "Illegal response size %u for command %d\n",
 180                                  le16_to_cpu(pdu->StructureSize2), command);
 181                         return 1;
 182                 } else if (command == SMB2_OPLOCK_BREAK_HE
 183                            && (shdr->Status == 0)
 184                            && (le16_to_cpu(pdu->StructureSize2) != 44)
 185                            && (le16_to_cpu(pdu->StructureSize2) != 36)) {
 186                         /* special case for SMB2.1 lease break message */
 187                         cifs_dbg(VFS, "Illegal response size %d for oplock break\n",
 188                                  le16_to_cpu(pdu->StructureSize2));
 189                         return 1;
 190                 }
 191         }
 192
 193         if (srvr->vals->header_preamble_size + len != length) {
 194                 cifs_dbg(VFS, "Total length %u RFC1002 length %u mismatch mid %llu\n",
 195                          length, srvr->vals->header_preamble_size + len, mid);
 196                 return 1;
 197         }
 198
 199         clc_len = smb2_calc_size(hdr);
 200
 201         if (srvr->vals->header_preamble_size + len != clc_len) {
 202                 cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n",
 203                          clc_len, srvr->vals->header_preamble_size + len, mid);
 204                 /* create failed on symlink */
 205                 if (command == SMB2_CREATE_HE &&
 206                     shdr->Status == STATUS_STOPPED_ON_SYMLINK)
 207                         return 0;
 208                 /* Windows 7 server returns 24 bytes more */
 209                 if (clc_len + 24 - srvr->vals->header_preamble_size == len && command == SMB2_OPLOCK_BREAK_HE)
 210                         return 0;
 211                 /* server can return one byte more due to implied bcc[0] */
 212                 if (clc_len == srvr->vals->header_preamble_size + len + 1)
 213                         return 0;
 214
 215                 /*
 216                  * MacOS server pads after SMB2.1 write response with 3 bytes
 217                  * of junk. Other servers match RFC1001 len to actual
 218                  * SMB2/SMB3 frame length (header + smb2 response specific data)
 219                  * Log the server error (once), but allow it and continue
 220                  * since the frame is parseable.
 221                  */
 222                 if (clc_len < srvr->vals->header_preamble_size /* RFC1001 header size */ + len) {
 223                         printk_once(KERN_WARNING
 224                                 "SMB2 server sent bad RFC1001 len %d not %d\n",
 225                                 len, clc_len - srvr->vals->header_preamble_size);
 226                         return 0;
 227                 }
 228
 229                 return 1;
 230         }
 231         return 0;
 232 }
 233
 234 /*
 235  * The size of the variable area depends on the offset and length fields
 236  * located in different fields for various SMB2 responses. SMB2 responses
 237  * with no variable length info, show an offset of zero for the offset field.
 238  */
 239 static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
 240         /* SMB2_NEGOTIATE */ true,
 241         /* SMB2_SESSION_SETUP */ true,
 242         /* SMB2_LOGOFF */ false,
 243         /* SMB2_TREE_CONNECT */ false,
 244         /* SMB2_TREE_DISCONNECT */ false,
 245         /* SMB2_CREATE */ true,
 246         /* SMB2_CLOSE */ false,
 247         /* SMB2_FLUSH */ false,
 248         /* SMB2_READ */ true,
 249         /* SMB2_WRITE */ false,
 250         /* SMB2_LOCK */ false,
 251         /* SMB2_IOCTL */ true,
 252         /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
 253         /* SMB2_ECHO */ false,
 254         /* SMB2_QUERY_DIRECTORY */ true,
 255         /* SMB2_CHANGE_NOTIFY */ true,
 256         /* SMB2_QUERY_INFO */ true,
 257         /* SMB2_SET_INFO */ false,
 258         /* SMB2_OPLOCK_BREAK */ false
 259 };
 260
 261 /*
 262  * Returns the pointer to the beginning of the data area. Length of the data
 263  * area and the offset to it (from the beginning of the smb are also returned.
 264  */
 265 char *
 266 smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
 267 {
 268         struct smb2_sync_hdr *shdr = get_sync_hdr(hdr);
 269         *off = 0;
 270         *len = 0;
 271
 272         /* error responses do not have data area */
 273         if (shdr->Status && shdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
 274             (((struct smb2_err_rsp *)hdr)->StructureSize) ==
 275                                                 SMB2_ERROR_STRUCTURE_SIZE2)
 276                 return NULL;
 277
 278         /*
 279          * Following commands have data areas so we have to get the location
 280          * of the data buffer offset and data buffer length for the particular
 281          * command.
 282          */
 283         switch (shdr->Command) {
 284         case SMB2_NEGOTIATE:
 285                 *off = le16_to_cpu(
 286                     ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferOffset);
 287                 *len = le16_to_cpu(
 288                     ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferLength);
 289                 break;
 290         case SMB2_SESSION_SETUP:
 291                 *off = le16_to_cpu(
 292                     ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferOffset);
 293                 *len = le16_to_cpu(
 294                     ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferLength);
 295                 break;
 296         case SMB2_CREATE:
 297                 *off = le32_to_cpu(
 298                     ((struct smb2_create_rsp *)hdr)->CreateContextsOffset);
 299                 *len = le32_to_cpu(
 300                     ((struct smb2_create_rsp *)hdr)->CreateContextsLength);
 301                 break;
 302         case SMB2_QUERY_INFO:
 303                 *off = le16_to_cpu(
 304                     ((struct smb2_query_info_rsp *)hdr)->OutputBufferOffset);
 305                 *len = le32_to_cpu(
 306                     ((struct smb2_query_info_rsp *)hdr)->OutputBufferLength);
 307                 break;
 308         case SMB2_READ:
 309                 *off = ((struct smb2_read_rsp *)hdr)->DataOffset;
 310                 *len = le32_to_cpu(((struct smb2_read_rsp *)hdr)->DataLength);
 311                 break;
 312         case SMB2_QUERY_DIRECTORY:
 313                 *off = le16_to_cpu(
 314                   ((struct smb2_query_directory_rsp *)hdr)->OutputBufferOffset);
 315                 *len = le32_to_cpu(
 316                   ((struct smb2_query_directory_rsp *)hdr)->OutputBufferLength);
 317                 break;
 318         case SMB2_IOCTL:
 319                 *off = le32_to_cpu(
 320                   ((struct smb2_ioctl_rsp *)hdr)->OutputOffset);
 321                 *len = le32_to_cpu(((struct smb2_ioctl_rsp *)hdr)->OutputCount);
 322                 break;
 323         case SMB2_CHANGE_NOTIFY:
 324         default:
 325                 /* BB FIXME for unimplemented cases above */
 326                 cifs_dbg(VFS, "no length check for command\n");
 327                 break;
 328         }
 329
 330         /*
 331          * Invalid length or offset probably means data area is invalid, but
 332          * we have little choice but to ignore the data area in this case.
 333          */
 334         if (*off > 4096) {
 335                 cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off);
 336                 *len = 0;
 337                 *off = 0;
 338         } else if (*off < 0) {
 339                 cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n",
 340                          *off);
 341                 *off = 0;
 342                 *len = 0;
 343         } else if (*len < 0) {
 344                 cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n",
 345                          *len);
 346                 *len = 0;
 347         } else if (*len > 128 * 1024) {
 348                 cifs_dbg(VFS, "data area larger than 128K: %d\n", *len);
 349                 *len = 0;
 350         }
 351
 352         /* return pointer to beginning of data area, ie offset from SMB start */
 353         if ((*off != 0) && (*len != 0))
 354                 return (char *)shdr + *off;
 355         else
 356                 return NULL;
 357 }
 358
 359 /*
 360  * Calculate the size of the SMB message based on the fixed header
 361  * portion, the number of word parameters and the data portion of the message.
 362  */
 363 unsigned int
 364 smb2_calc_size(void *buf)
 365 {
 366         struct smb2_pdu *pdu = (struct smb2_pdu *)buf;
 367         struct smb2_hdr *hdr = &pdu->hdr;
 368         struct smb2_sync_hdr *shdr = get_sync_hdr(hdr);
 369         int offset; /* the offset from the beginning of SMB to data area */
 370         int data_length; /* the length of the variable length data area */
 371         /* Structure Size has already been checked to make sure it is 64 */
 372         int len = 4 + le16_to_cpu(shdr->StructureSize);
 373
 374         /*
 375          * StructureSize2, ie length of fixed parameter area has already
 376          * been checked to make sure it is the correct length.
 377          */
 378         len += le16_to_cpu(pdu->StructureSize2);
 379
 380         if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false)
 381                 goto calc_size_exit;
 382
 383         smb2_get_data_area_len(&offset, &data_length, hdr);
 384         cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset);
 385
 386         if (data_length > 0) {
 387                 /*
 388                  * Check to make sure that data area begins after fixed area,
 389                  * Note that last byte of the fixed area is part of data area
 390                  * for some commands, typically those with odd StructureSize,
 391                  * so we must add one to the calculation (and 4 to account for
 392                  * the size of the RFC1001 hdr.
 393                  */
 394                 if (offset + 4 + 1 < len) {
 395                         cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n",
 396                                  offset + 4 + 1, len);
 397                         data_length = 0;
 398                 } else {
 399                         len = 4 + offset + data_length;
 400                 }
 401         }
 402 calc_size_exit:
 403         cifs_dbg(FYI, "SMB2 len %d\n", len);
 404         return len;
 405 }
 406
 407 /* Note: caller must free return buffer */
 408 __le16 *
 409 cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
 410 {
 411         int len;
 412         const char *start_of_path;
 413         __le16 *to;
 414         int map_type;
 415
 416         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
 417                 map_type = SFM_MAP_UNI_RSVD;
 418         else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 419                 map_type = SFU_MAP_UNI_RSVD;
 420         else
 421                 map_type = NO_MAP_UNI_RSVD;
 422
 423         /* Windows doesn't allow paths beginning with \ */
 424         if (from[0] == '\\')
 425                 start_of_path = from + 1;
 426         else
 427                 start_of_path = from;
 428         to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
 429                                    cifs_sb->local_nls, map_type);
 430         return to;
 431 }
 432
 433 __le32
 434 smb2_get_lease_state(struct cifsInodeInfo *cinode)
 435 {
 436         __le32 lease = 0;
 437
 438         if (CIFS_CACHE_WRITE(cinode))
 439                 lease |= SMB2_LEASE_WRITE_CACHING;
 440         if (CIFS_CACHE_HANDLE(cinode))
 441                 lease |= SMB2_LEASE_HANDLE_CACHING;
 442         if (CIFS_CACHE_READ(cinode))
 443                 lease |= SMB2_LEASE_READ_CACHING;
 444         return lease;
 445 }
 446
 447 struct smb2_lease_break_work {
 448         struct work_struct lease_break;
 449         struct tcon_link *tlink;
 450         __u8 lease_key[16];
 451         __le32 lease_state;
 452 };
 453
 454 static void
 455 cifs_ses_oplock_break(struct work_struct *work)
 456 {
 457         struct smb2_lease_break_work *lw = container_of(work,
 458                                 struct smb2_lease_break_work, lease_break);
 459         int rc;
 460
 461         rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
 462                               lw->lease_state);
 463         cifs_dbg(FYI, "Lease release rc %d\n", rc);
 464         cifs_put_tlink(lw->tlink);
 465         kfree(lw);
 466 }
 467
 468 static bool
 469 smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp,
 470                     struct smb2_lease_break_work *lw)
 471 {
 472         bool found;
 473         __u8 lease_state;
 474         struct list_head *tmp;
 475         struct cifsFileInfo *cfile;
 476         struct TCP_Server_Info *server = tcon->ses->server;
 477         struct cifs_pending_open *open;
 478         struct cifsInodeInfo *cinode;
 479         int ack_req = le32_to_cpu(rsp->Flags &
 480                                   SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
 481
 482         lease_state = le32_to_cpu(rsp->NewLeaseState);
 483
 484         list_for_each(tmp, &tcon->openFileList) {
 485                 cfile = list_entry(tmp, struct cifsFileInfo, tlist);
 486                 cinode = CIFS_I(d_inode(cfile->dentry));
 487
 488                 if (memcmp(cinode->lease_key, rsp->LeaseKey,
 489                                                         SMB2_LEASE_KEY_SIZE))
 490                         continue;
 491
 492                 cifs_dbg(FYI, "found in the open list\n");
 493                 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
 494                          le32_to_cpu(rsp->NewLeaseState));
 495
 496                 server->ops->set_oplock_level(cinode, lease_state, 0, NULL);
 497
 498                 if (ack_req)
 499                         cfile->oplock_break_cancelled = false;
 500                 else
 501                         cfile->oplock_break_cancelled = true;
 502
 503                 queue_work(cifsoplockd_wq, &cfile->oplock_break);
 504                 kfree(lw);
 505                 return true;
 506         }
 507
 508         found = false;
 509         list_for_each_entry(open, &tcon->pending_opens, olist) {
 510                 if (memcmp(open->lease_key, rsp->LeaseKey,
 511                            SMB2_LEASE_KEY_SIZE))
 512                         continue;
 513
 514                 if (!found && ack_req) {
 515                         found = true;
 516                         memcpy(lw->lease_key, open->lease_key,
 517                                SMB2_LEASE_KEY_SIZE);
 518                         lw->tlink = cifs_get_tlink(open->tlink);
 519                         queue_work(cifsiod_wq, &lw->lease_break);
 520                 }
 521
 522                 cifs_dbg(FYI, "found in the pending open list\n");
 523                 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
 524                          le32_to_cpu(rsp->NewLeaseState));
 525
 526                 open->oplock = lease_state;
 527         }
 528         return found;
 529 }
 530
 531 static bool
 532 smb2_is_valid_lease_break(char *buffer)
 533 {
 534         struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
 535         struct list_head *tmp, *tmp1, *tmp2;
 536         struct TCP_Server_Info *server;
 537         struct cifs_ses *ses;
 538         struct cifs_tcon *tcon;
 539         struct smb2_lease_break_work *lw;
 540
 541         lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
 542         if (!lw)
 543                 return false;
 544
 545         INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
 546         lw->lease_state = rsp->NewLeaseState;
 547
 548         cifs_dbg(FYI, "Checking for lease break\n");
 549
 550         /* look up tcon based on tid & uid */
 551         spin_lock(&cifs_tcp_ses_lock);
 552         list_for_each(tmp, &cifs_tcp_ses_list) {
 553                 server = list_entry(tmp, struct TCP_Server_Info, tcp_ses_list);
 554
 555                 list_for_each(tmp1, &server->smb_ses_list) {
 556                         ses = list_entry(tmp1, struct cifs_ses, smb_ses_list);
 557
 558                         list_for_each(tmp2, &ses->tcon_list) {
 559                                 tcon = list_entry(tmp2, struct cifs_tcon,
 560                                                   tcon_list);
 561                                 spin_lock(&tcon->open_file_lock);
 562                                 cifs_stats_inc(
 563                                     &tcon->stats.cifs_stats.num_oplock_brks);
 564                                 if (smb2_tcon_has_lease(tcon, rsp, lw)) {
 565                                         spin_unlock(&tcon->open_file_lock);
 566                                         spin_unlock(&cifs_tcp_ses_lock);
 567                                         return true;
 568                                 }
 569                                 spin_unlock(&tcon->open_file_lock);
 570                         }
 571                 }
 572         }
 573         spin_unlock(&cifs_tcp_ses_lock);
 574         kfree(lw);
 575         cifs_dbg(FYI, "Can not process lease break - no lease matched\n");
 576         return false;
 577 }
 578
 579 bool
 580 smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
 581 {
 582         struct smb2_oplock_break_rsp *rsp = (struct smb2_oplock_break_rsp *)buffer;
 583         struct list_head *tmp, *tmp1, *tmp2;
 584         struct cifs_ses *ses;
 585         struct cifs_tcon *tcon;
 586         struct cifsInodeInfo *cinode;
 587         struct cifsFileInfo *cfile;
 588
 589         cifs_dbg(FYI, "Checking for oplock break\n");
 590
 591         if (rsp->hdr.sync_hdr.Command != SMB2_OPLOCK_BREAK)
 592                 return false;
 593
 594         if (rsp->StructureSize !=
 595                                 smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
 596                 if (le16_to_cpu(rsp->StructureSize) == 44)
 597                         return smb2_is_valid_lease_break(buffer);
 598                 else
 599                         return false;
 600         }
 601
 602         cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel);
 603
 604         /* look up tcon based on tid & uid */
 605         spin_lock(&cifs_tcp_ses_lock);
 606         list_for_each(tmp, &server->smb_ses_list) {
 607                 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
 608                 list_for_each(tmp1, &ses->tcon_list) {
 609                         tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
 610
 611                         cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
 612                         spin_lock(&tcon->open_file_lock);
 613                         list_for_each(tmp2, &tcon->openFileList) {
 614                                 cfile = list_entry(tmp2, struct cifsFileInfo,
 615                                                      tlist);
 616                                 if (rsp->PersistentFid !=
 617                                     cfile->fid.persistent_fid ||
 618                                     rsp->VolatileFid !=
 619                                     cfile->fid.volatile_fid)
 620                                         continue;
 621
 622                                 cifs_dbg(FYI, "file id match, oplock break\n");
 623                                 cinode = CIFS_I(d_inode(cfile->dentry));
 624                                 spin_lock(&cfile->file_info_lock);
 625                                 if (!CIFS_CACHE_WRITE(cinode) &&
 626                                     rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
 627                                         cfile->oplock_break_cancelled = true;
 628                                 else
 629                                         cfile->oplock_break_cancelled = false;
 630
 631                                 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
 632                                         &cinode->flags);
 633
 634                                 /*
 635                                  * Set flag if the server downgrades the oplock
 636                                  * to L2 else clear.
 637                                  */
 638                                 if (rsp->OplockLevel)
 639                                         set_bit(
 640                                            CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
 641                                            &cinode->flags);
 642                                 else
 643                                         clear_bit(
 644                                            CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
 645                                            &cinode->flags);
 646                                 spin_unlock(&cfile->file_info_lock);
 647                                 queue_work(cifsoplockd_wq,
 648                                            &cfile->oplock_break);
 649
 650                                 spin_unlock(&tcon->open_file_lock);
 651                                 spin_unlock(&cifs_tcp_ses_lock);
 652                                 return true;
 653                         }
 654                         spin_unlock(&tcon->open_file_lock);
 655                         spin_unlock(&cifs_tcp_ses_lock);
 656                         cifs_dbg(FYI, "No matching file for oplock break\n");
 657                         return true;
 658                 }
 659         }
 660         spin_unlock(&cifs_tcp_ses_lock);
 661         cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
 662         return false;
 663 }
 664
 665 void
 666 smb2_cancelled_close_fid(struct work_struct *work)
 667 {
 668         struct close_cancelled_open *cancelled = container_of(work,
 669                                         struct close_cancelled_open, work);
 670
 671         cifs_dbg(VFS, "Close unmatched open\n");
 672
 673         SMB2_close(0, cancelled->tcon, cancelled->fid.persistent_fid,
 674                    cancelled->fid.volatile_fid);
 675         cifs_put_tcon(cancelled->tcon);
 676         kfree(cancelled);
 677 }
 678
 679 int
 680 smb2_handle_cancelled_mid(char *buffer, struct TCP_Server_Info *server)
 681 {
 682         struct smb2_sync_hdr *sync_hdr = get_sync_hdr(buffer);
 683         struct smb2_create_rsp *rsp = (struct smb2_create_rsp *)buffer;
 684         struct cifs_tcon *tcon;
 685         struct close_cancelled_open *cancelled;
 686
 687         if (sync_hdr->Command != SMB2_CREATE ||
 688             sync_hdr->Status != STATUS_SUCCESS)
 689                 return 0;
 690
 691         cancelled = kzalloc(sizeof(*cancelled), GFP_KERNEL);
 692         if (!cancelled)
 693                 return -ENOMEM;
 694
 695         tcon = smb2_find_smb_tcon(server, sync_hdr->SessionId,
 696                                   sync_hdr->TreeId);
 697         if (!tcon) {
 698                 kfree(cancelled);
 699                 return -ENOENT;
 700         }
 701
 702         cancelled->fid.persistent_fid = rsp->PersistentFileId;
 703         cancelled->fid.volatile_fid = rsp->VolatileFileId;
 704         cancelled->tcon = tcon;
 705         INIT_WORK(&cancelled->work, smb2_cancelled_close_fid);
 706         queue_work(cifsiod_wq, &cancelled->work);
 707
 708         return 0;
 709 }
 710
 711 #ifdef CONFIG_CIFS_SMB311
 712 /**
 713  * smb311_update_preauth_hash - update @ses hash with the packet data in @iov
 714  *
 715  * Assumes @iov does not contain the rfc1002 length and iov[0] has the
 716  * SMB2 header.
 717  */
 718 int
 719 smb311_update_preauth_hash(struct cifs_ses *ses, struct kvec *iov, int nvec)
 720 {
 721         int i, rc;
 722         struct sdesc *d;
 723         struct smb2_sync_hdr *hdr;
 724
 725         if (ses->server->tcpStatus == CifsGood) {
 726                 /* skip non smb311 connections */
 727                 if (ses->server->dialect != SMB311_PROT_ID)
 728                         return 0;
 729
 730                 /* skip last sess setup response */
 731                 hdr = (struct smb2_sync_hdr *)iov[0].iov_base;
 732                 if (hdr->Flags & SMB2_FLAGS_SIGNED)
 733                         return 0;
 734         }
 735
 736         rc = smb311_crypto_shash_allocate(ses->server);
 737         if (rc)
 738                 return rc;
 739
 740         d = ses->server->secmech.sdescsha512;
 741         rc = crypto_shash_init(&d->shash);
 742         if (rc) {
 743                 cifs_dbg(VFS, "%s: could not init sha512 shash\n", __func__);
 744                 return rc;
 745         }
 746
 747         rc = crypto_shash_update(&d->shash, ses->preauth_sha_hash,
 748                                  SMB2_PREAUTH_HASH_SIZE);
 749         if (rc) {
 750                 cifs_dbg(VFS, "%s: could not update sha512 shash\n", __func__);
 751                 return rc;
 752         }
 753
 754         for (i = 0; i < nvec; i++) {
 755                 rc = crypto_shash_update(&d->shash,
 756                                          iov[i].iov_base, iov[i].iov_len);
 757                 if (rc) {
 758                         cifs_dbg(VFS, "%s: could not update sha512 shash\n",
 759                                  __func__);
 760                         return rc;
 761                 }
 762         }
 763
 764         rc = crypto_shash_final(&d->shash, ses->preauth_sha_hash);
 765         if (rc) {
 766                 cifs_dbg(VFS, "%s: could not finalize sha512 shash\n",
 767                          __func__);
 768                 return rc;
 769         }
 770
 771         return 0;
 772 }
 773 #endif