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 #include "nterr.h"
  33
  34 static int
  35 check_smb2_hdr(struct smb2_sync_hdr *shdr, __u64 mid)
  36 {
  37         __u64 wire_mid = le64_to_cpu(shdr->MessageId);
  38
  39         /*
  40          * Make sure that this really is an SMB, that it is a response,
  41          * and that the message ids match.
  42          */
  43         if ((shdr->ProtocolId == SMB2_PROTO_NUMBER) &&
  44             (mid == wire_mid)) {
  45                 if (shdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
  46                         return 0;
  47                 else {
  48                         /* only one valid case where server sends us request */
  49                         if (shdr->Command == SMB2_OPLOCK_BREAK)
  50                                 return 0;
  51                         else
  52                                 cifs_dbg(VFS, "Received Request not response\n");
  53                 }
  54         } else { /* bad signature or mid */
  55                 if (shdr->ProtocolId != SMB2_PROTO_NUMBER)
  56                         cifs_dbg(VFS, "Bad protocol string signature header %x\n",
  57                                  le32_to_cpu(shdr->ProtocolId));
  58                 if (mid != wire_mid)
  59                         cifs_dbg(VFS, "Mids do not match: %llu and %llu\n",
  60                                  mid, wire_mid);
  61         }
  62         cifs_dbg(VFS, "Bad SMB detected. The Mid=%llu\n", wire_mid);
  63         return 1;
  64 }
  65
  66 /*
  67  *  The following table defines the expected "StructureSize" of SMB2 responses
  68  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS responses.
  69  *
  70  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  71  *  indexed by command in host byte order
  72  */
  73 static const __le16 smb2_rsp_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  74         /* SMB2_NEGOTIATE */ cpu_to_le16(65),
  75         /* SMB2_SESSION_SETUP */ cpu_to_le16(9),
  76         /* SMB2_LOGOFF */ cpu_to_le16(4),
  77         /* SMB2_TREE_CONNECT */ cpu_to_le16(16),
  78         /* SMB2_TREE_DISCONNECT */ cpu_to_le16(4),
  79         /* SMB2_CREATE */ cpu_to_le16(89),
  80         /* SMB2_CLOSE */ cpu_to_le16(60),
  81         /* SMB2_FLUSH */ cpu_to_le16(4),
  82         /* SMB2_READ */ cpu_to_le16(17),
  83         /* SMB2_WRITE */ cpu_to_le16(17),
  84         /* SMB2_LOCK */ cpu_to_le16(4),
  85         /* SMB2_IOCTL */ cpu_to_le16(49),
  86         /* BB CHECK this ... not listed in documentation */
  87         /* SMB2_CANCEL */ cpu_to_le16(0),
  88         /* SMB2_ECHO */ cpu_to_le16(4),
  89         /* SMB2_QUERY_DIRECTORY */ cpu_to_le16(9),
  90         /* SMB2_CHANGE_NOTIFY */ cpu_to_le16(9),
  91         /* SMB2_QUERY_INFO */ cpu_to_le16(9),
  92         /* SMB2_SET_INFO */ cpu_to_le16(2),
  93         /* BB FIXME can also be 44 for lease break */
  94         /* SMB2_OPLOCK_BREAK */ cpu_to_le16(24)
  95 };
  96
  97 #define SMB311_NEGPROT_BASE_SIZE (sizeof(struct smb2_sync_hdr) + sizeof(struct smb2_negotiate_rsp))
  98
  99 static __u32 get_neg_ctxt_len(struct smb2_sync_hdr *hdr, __u32 len,
 100                               __u32 non_ctxlen)
 101 {
 102         __u16 neg_count;
 103         __u32 nc_offset, size_of_pad_before_neg_ctxts;
 104         struct smb2_negotiate_rsp *pneg_rsp = (struct smb2_negotiate_rsp *)hdr;
 105
 106         /* Negotiate contexts are only valid for latest dialect SMB3.11 */
 107         neg_count = le16_to_cpu(pneg_rsp->NegotiateContextCount);
 108         if ((neg_count == 0) ||
 109            (pneg_rsp->DialectRevision != cpu_to_le16(SMB311_PROT_ID)))
 110                 return 0;
 111
 112         /* Make sure that negotiate contexts start after gss security blob */
 113         nc_offset = le32_to_cpu(pneg_rsp->NegotiateContextOffset);
 114         if (nc_offset + 1 < non_ctxlen) {
 115                 pr_warn_once("Invalid negotiate context offset %d\n", nc_offset);
 116                 return 0;
 117         } else if (nc_offset + 1 == non_ctxlen) {
 118                 cifs_dbg(FYI, "no SPNEGO security blob in negprot rsp\n");
 119                 size_of_pad_before_neg_ctxts = 0;
 120         } else if (non_ctxlen == SMB311_NEGPROT_BASE_SIZE + 1)
 121                 /* has padding, but no SPNEGO blob */
 122                 size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen + 1;
 123         else
 124                 size_of_pad_before_neg_ctxts = nc_offset - non_ctxlen;
 125
 126         /* Verify that at least minimal negotiate contexts fit within frame */
 127         if (len < nc_offset + (neg_count * sizeof(struct smb2_neg_context))) {
 128                 pr_warn_once("negotiate context goes beyond end\n");
 129                 return 0;
 130         }
 131
 132         cifs_dbg(FYI, "length of negcontexts %d pad %d\n",
 133                 len - nc_offset, size_of_pad_before_neg_ctxts);
 134
 135         /* length of negcontexts including pad from end of sec blob to them */
 136         return (len - nc_offset) + size_of_pad_before_neg_ctxts;
 137 }
 138
 139 int
 140 smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *srvr)
 141 {
 142         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buf;
 143         struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)shdr;
 144         __u64 mid;
 145         __u32 clc_len;  /* calculated length */
 146         int command;
 147         int pdu_size = sizeof(struct smb2_sync_pdu);
 148         int hdr_size = sizeof(struct smb2_sync_hdr);
 149
 150         /*
 151          * Add function to do table lookup of StructureSize by command
 152          * ie Validate the wct via smb2_struct_sizes table above
 153          */
 154         if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
 155                 struct smb2_transform_hdr *thdr =
 156                         (struct smb2_transform_hdr *)buf;
 157                 struct cifs_ses *ses = NULL;
 158                 struct list_head *tmp;
 159
 160                 /* decrypt frame now that it is completely read in */
 161                 spin_lock(&cifs_tcp_ses_lock);
 162                 list_for_each(tmp, &srvr->smb_ses_list) {
 163                         ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
 164                         if (ses->Suid == thdr->SessionId)
 165                                 break;
 166
 167                         ses = NULL;
 168                 }
 169                 spin_unlock(&cifs_tcp_ses_lock);
 170                 if (ses == NULL) {
 171                         cifs_dbg(VFS, "no decryption - session id not found\n");
 172                         return 1;
 173                 }
 174         }
 175
 176         mid = le64_to_cpu(shdr->MessageId);
 177         if (len < pdu_size) {
 178                 if ((len >= hdr_size)
 179                     && (shdr->Status != 0)) {
 180                         pdu->StructureSize2 = 0;
 181                         /*
 182                          * As with SMB/CIFS, on some error cases servers may
 183                          * not return wct properly
 184                          */
 185                         return 0;
 186                 } else {
 187                         cifs_dbg(VFS, "Length less than SMB header size\n");
 188                 }
 189                 return 1;
 190         }
 191         if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE) {
 192                 cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n",
 193                          mid);
 194                 return 1;
 195         }
 196
 197         if (check_smb2_hdr(shdr, mid))
 198                 return 1;
 199
 200         if (shdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
 201                 cifs_dbg(VFS, "Invalid structure size %u\n",
 202                          le16_to_cpu(shdr->StructureSize));
 203                 return 1;
 204         }
 205
 206         command = le16_to_cpu(shdr->Command);
 207         if (command >= NUMBER_OF_SMB2_COMMANDS) {
 208                 cifs_dbg(VFS, "Invalid SMB2 command %d\n", command);
 209                 return 1;
 210         }
 211
 212         if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
 213                 if (command != SMB2_OPLOCK_BREAK_HE && (shdr->Status == 0 ||
 214                     pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) {
 215                         /* error packets have 9 byte structure size */
 216                         cifs_dbg(VFS, "Invalid response size %u for command %d\n",
 217                                  le16_to_cpu(pdu->StructureSize2), command);
 218                         return 1;
 219                 } else if (command == SMB2_OPLOCK_BREAK_HE
 220                            && (shdr->Status == 0)
 221                            && (le16_to_cpu(pdu->StructureSize2) != 44)
 222                            && (le16_to_cpu(pdu->StructureSize2) != 36)) {
 223                         /* special case for SMB2.1 lease break message */
 224                         cifs_dbg(VFS, "Invalid response size %d for oplock break\n",
 225                                  le16_to_cpu(pdu->StructureSize2));
 226                         return 1;
 227                 }
 228         }
 229
 230         clc_len = smb2_calc_size(buf, srvr);
 231
 232         if (shdr->Command == SMB2_NEGOTIATE)
 233                 clc_len += get_neg_ctxt_len(shdr, len, clc_len);
 234
 235         if (len != clc_len) {
 236                 cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n",
 237                          clc_len, len, mid);
 238                 /* create failed on symlink */
 239                 if (command == SMB2_CREATE_HE &&
 240                     shdr->Status == STATUS_STOPPED_ON_SYMLINK)
 241                         return 0;
 242                 /* Windows 7 server returns 24 bytes more */
 243                 if (clc_len + 24 == len && command == SMB2_OPLOCK_BREAK_HE)
 244                         return 0;
 245                 /* server can return one byte more due to implied bcc[0] */
 246                 if (clc_len == len + 1)
 247                         return 0;
 248
 249                 /*
 250                  * Some windows servers (win2016) will pad also the final
 251                  * PDU in a compound to 8 bytes.
 252                  */
 253                 if (((clc_len + 7) & ~7) == len)
 254                         return 0;
 255
 256                 /*
 257                  * MacOS server pads after SMB2.1 write response with 3 bytes
 258                  * of junk. Other servers match RFC1001 len to actual
 259                  * SMB2/SMB3 frame length (header + smb2 response specific data)
 260                  * Some windows servers also pad up to 8 bytes when compounding.
 261                  */
 262                 if (clc_len < len)
 263                         return 0;
 264
 265                 pr_warn_once(
 266                         "srv rsp too short, len %d not %d. cmd:%d mid:%llu\n",
 267                         len, clc_len, command, mid);
 268
 269                 return 1;
 270         }
 271         return 0;
 272 }
 273
 274 /*
 275  * The size of the variable area depends on the offset and length fields
 276  * located in different fields for various SMB2 responses. SMB2 responses
 277  * with no variable length info, show an offset of zero for the offset field.
 278  */
 279 static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
 280         /* SMB2_NEGOTIATE */ true,
 281         /* SMB2_SESSION_SETUP */ true,
 282         /* SMB2_LOGOFF */ false,
 283         /* SMB2_TREE_CONNECT */ false,
 284         /* SMB2_TREE_DISCONNECT */ false,
 285         /* SMB2_CREATE */ true,
 286         /* SMB2_CLOSE */ false,
 287         /* SMB2_FLUSH */ false,
 288         /* SMB2_READ */ true,
 289         /* SMB2_WRITE */ false,
 290         /* SMB2_LOCK */ false,
 291         /* SMB2_IOCTL */ true,
 292         /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
 293         /* SMB2_ECHO */ false,
 294         /* SMB2_QUERY_DIRECTORY */ true,
 295         /* SMB2_CHANGE_NOTIFY */ true,
 296         /* SMB2_QUERY_INFO */ true,
 297         /* SMB2_SET_INFO */ false,
 298         /* SMB2_OPLOCK_BREAK */ false
 299 };
 300
 301 /*
 302  * Returns the pointer to the beginning of the data area. Length of the data
 303  * area and the offset to it (from the beginning of the smb are also returned.
 304  */
 305 char *
 306 smb2_get_data_area_len(int *off, int *len, struct smb2_sync_hdr *shdr)
 307 {
 308         const int max_off = 4096;
 309         const int max_len = 128 * 1024;
 310
 311         *off = 0;
 312         *len = 0;
 313
 314         /* error responses do not have data area */
 315         if (shdr->Status && shdr->Status != STATUS_MORE_PROCESSING_REQUIRED &&
 316             (((struct smb2_err_rsp *)shdr)->StructureSize) ==
 317                                                 SMB2_ERROR_STRUCTURE_SIZE2)
 318                 return NULL;
 319
 320         /*
 321          * Following commands have data areas so we have to get the location
 322          * of the data buffer offset and data buffer length for the particular
 323          * command.
 324          */
 325         switch (shdr->Command) {
 326         case SMB2_NEGOTIATE:
 327                 *off = le16_to_cpu(
 328                   ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferOffset);
 329                 *len = le16_to_cpu(
 330                   ((struct smb2_negotiate_rsp *)shdr)->SecurityBufferLength);
 331                 break;
 332         case SMB2_SESSION_SETUP:
 333                 *off = le16_to_cpu(
 334                   ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferOffset);
 335                 *len = le16_to_cpu(
 336                   ((struct smb2_sess_setup_rsp *)shdr)->SecurityBufferLength);
 337                 break;
 338         case SMB2_CREATE:
 339                 *off = le32_to_cpu(
 340                     ((struct smb2_create_rsp *)shdr)->CreateContextsOffset);
 341                 *len = le32_to_cpu(
 342                     ((struct smb2_create_rsp *)shdr)->CreateContextsLength);
 343                 break;
 344         case SMB2_QUERY_INFO:
 345                 *off = le16_to_cpu(
 346                     ((struct smb2_query_info_rsp *)shdr)->OutputBufferOffset);
 347                 *len = le32_to_cpu(
 348                     ((struct smb2_query_info_rsp *)shdr)->OutputBufferLength);
 349                 break;
 350         case SMB2_READ:
 351                 /* TODO: is this a bug ? */
 352                 *off = ((struct smb2_read_rsp *)shdr)->DataOffset;
 353                 *len = le32_to_cpu(((struct smb2_read_rsp *)shdr)->DataLength);
 354                 break;
 355         case SMB2_QUERY_DIRECTORY:
 356                 *off = le16_to_cpu(
 357                   ((struct smb2_query_directory_rsp *)shdr)->OutputBufferOffset);
 358                 *len = le32_to_cpu(
 359                   ((struct smb2_query_directory_rsp *)shdr)->OutputBufferLength);
 360                 break;
 361         case SMB2_IOCTL:
 362                 *off = le32_to_cpu(
 363                   ((struct smb2_ioctl_rsp *)shdr)->OutputOffset);
 364                 *len = le32_to_cpu(
 365                   ((struct smb2_ioctl_rsp *)shdr)->OutputCount);
 366                 break;
 367         case SMB2_CHANGE_NOTIFY:
 368                 *off = le16_to_cpu(
 369                   ((struct smb2_change_notify_rsp *)shdr)->OutputBufferOffset);
 370                 *len = le32_to_cpu(
 371                   ((struct smb2_change_notify_rsp *)shdr)->OutputBufferLength);
 372                 break;
 373         default:
 374                 cifs_dbg(VFS, "no length check for command %d\n", le16_to_cpu(shdr->Command));
 375                 break;
 376         }
 377
 378         /*
 379          * Invalid length or offset probably means data area is invalid, but
 380          * we have little choice but to ignore the data area in this case.
 381          */
 382         if (unlikely(*off < 0 || *off > max_off ||
 383                      *len < 0 || *len > max_len)) {
 384                 cifs_dbg(VFS, "%s: invalid data area (off=%d len=%d)\n",
 385                          __func__, *off, *len);
 386                 *off = 0;
 387                 *len = 0;
 388         } else if (*off == 0) {
 389                 *len = 0;
 390         }
 391
 392         /* return pointer to beginning of data area, ie offset from SMB start */
 393         if (*off > 0 && *len > 0)
 394                 return (char *)shdr + *off;
 395         return NULL;
 396 }
 397
 398 /*
 399  * Calculate the size of the SMB message based on the fixed header
 400  * portion, the number of word parameters and the data portion of the message.
 401  */
 402 unsigned int
 403 smb2_calc_size(void *buf, struct TCP_Server_Info *srvr)
 404 {
 405         struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)buf;
 406         struct smb2_sync_hdr *shdr = &pdu->sync_hdr;
 407         int offset; /* the offset from the beginning of SMB to data area */
 408         int data_length; /* the length of the variable length data area */
 409         /* Structure Size has already been checked to make sure it is 64 */
 410         int len = le16_to_cpu(shdr->StructureSize);
 411
 412         /*
 413          * StructureSize2, ie length of fixed parameter area has already
 414          * been checked to make sure it is the correct length.
 415          */
 416         len += le16_to_cpu(pdu->StructureSize2);
 417
 418         if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false)
 419                 goto calc_size_exit;
 420
 421         smb2_get_data_area_len(&offset, &data_length, shdr);
 422         cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset);
 423
 424         if (data_length > 0) {
 425                 /*
 426                  * Check to make sure that data area begins after fixed area,
 427                  * Note that last byte of the fixed area is part of data area
 428                  * for some commands, typically those with odd StructureSize,
 429                  * so we must add one to the calculation.
 430                  */
 431                 if (offset + 1 < len) {
 432                         cifs_dbg(VFS, "data area offset %d overlaps SMB2 header %d\n",
 433                                  offset + 1, len);
 434                         data_length = 0;
 435                 } else {
 436                         len = offset + data_length;
 437                 }
 438         }
 439 calc_size_exit:
 440         cifs_dbg(FYI, "SMB2 len %d\n", len);
 441         return len;
 442 }
 443
 444 /* Note: caller must free return buffer */
 445 __le16 *
 446 cifs_convert_path_to_utf16(const char *from, struct cifs_sb_info *cifs_sb)
 447 {
 448         int len;
 449         const char *start_of_path;
 450         __le16 *to;
 451         int map_type;
 452
 453         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
 454                 map_type = SFM_MAP_UNI_RSVD;
 455         else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 456                 map_type = SFU_MAP_UNI_RSVD;
 457         else
 458                 map_type = NO_MAP_UNI_RSVD;
 459
 460         /* Windows doesn't allow paths beginning with \ */
 461         if (from[0] == '\\')
 462                 start_of_path = from + 1;
 463
 464         /* SMB311 POSIX extensions paths do not include leading slash */
 465         else if (cifs_sb_master_tlink(cifs_sb) &&
 466                  cifs_sb_master_tcon(cifs_sb)->posix_extensions &&
 467                  (from[0] == '/')) {
 468                 start_of_path = from + 1;
 469         } else
 470                 start_of_path = from;
 471
 472         to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
 473                                    cifs_sb->local_nls, map_type);
 474         return to;
 475 }
 476
 477 __le32
 478 smb2_get_lease_state(struct cifsInodeInfo *cinode)
 479 {
 480         __le32 lease = 0;
 481
 482         if (CIFS_CACHE_WRITE(cinode))
 483                 lease |= SMB2_LEASE_WRITE_CACHING;
 484         if (CIFS_CACHE_HANDLE(cinode))
 485                 lease |= SMB2_LEASE_HANDLE_CACHING;
 486         if (CIFS_CACHE_READ(cinode))
 487                 lease |= SMB2_LEASE_READ_CACHING;
 488         return lease;
 489 }
 490
 491 struct smb2_lease_break_work {
 492         struct work_struct lease_break;
 493         struct tcon_link *tlink;
 494         __u8 lease_key[16];
 495         __le32 lease_state;
 496 };
 497
 498 static void
 499 cifs_ses_oplock_break(struct work_struct *work)
 500 {
 501         struct smb2_lease_break_work *lw = container_of(work,
 502                                 struct smb2_lease_break_work, lease_break);
 503         int rc = 0;
 504
 505         rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
 506                               lw->lease_state);
 507
 508         cifs_dbg(FYI, "Lease release rc %d\n", rc);
 509         cifs_put_tlink(lw->tlink);
 510         kfree(lw);
 511 }
 512
 513 static void
 514 smb2_queue_pending_open_break(struct tcon_link *tlink, __u8 *lease_key,
 515                               __le32 new_lease_state)
 516 {
 517         struct smb2_lease_break_work *lw;
 518
 519         lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
 520         if (!lw) {
 521                 cifs_put_tlink(tlink);
 522                 return;
 523         }
 524
 525         INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
 526         lw->tlink = tlink;
 527         lw->lease_state = new_lease_state;
 528         memcpy(lw->lease_key, lease_key, SMB2_LEASE_KEY_SIZE);
 529         queue_work(cifsiod_wq, &lw->lease_break);
 530 }
 531
 532 static bool
 533 smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp)
 534 {
 535         __u8 lease_state;
 536         struct list_head *tmp;
 537         struct cifsFileInfo *cfile;
 538         struct cifsInodeInfo *cinode;
 539         int ack_req = le32_to_cpu(rsp->Flags &
 540                                   SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
 541
 542         lease_state = le32_to_cpu(rsp->NewLeaseState);
 543
 544         list_for_each(tmp, &tcon->openFileList) {
 545                 cfile = list_entry(tmp, struct cifsFileInfo, tlist);
 546                 cinode = CIFS_I(d_inode(cfile->dentry));
 547
 548                 if (memcmp(cinode->lease_key, rsp->LeaseKey,
 549                                                         SMB2_LEASE_KEY_SIZE))
 550                         continue;
 551
 552                 cifs_dbg(FYI, "found in the open list\n");
 553                 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
 554                          lease_state);
 555
 556                 if (ack_req)
 557                         cfile->oplock_break_cancelled = false;
 558                 else
 559                         cfile->oplock_break_cancelled = true;
 560
 561                 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK, &cinode->flags);
 562
 563                 cfile->oplock_epoch = le16_to_cpu(rsp->Epoch);
 564                 cfile->oplock_level = lease_state;
 565
 566                 cifs_queue_oplock_break(cfile);
 567                 return true;
 568         }
 569
 570         return false;
 571 }
 572
 573 static struct cifs_pending_open *
 574 smb2_tcon_find_pending_open_lease(struct cifs_tcon *tcon,
 575                                   struct smb2_lease_break *rsp)
 576 {
 577         __u8 lease_state = le32_to_cpu(rsp->NewLeaseState);
 578         int ack_req = le32_to_cpu(rsp->Flags &
 579                                   SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
 580         struct cifs_pending_open *open;
 581         struct cifs_pending_open *found = NULL;
 582
 583         list_for_each_entry(open, &tcon->pending_opens, olist) {
 584                 if (memcmp(open->lease_key, rsp->LeaseKey,
 585                            SMB2_LEASE_KEY_SIZE))
 586                         continue;
 587
 588                 if (!found && ack_req) {
 589                         found = open;
 590                 }
 591
 592                 cifs_dbg(FYI, "found in the pending open list\n");
 593                 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
 594                          lease_state);
 595
 596                 open->oplock = lease_state;
 597         }
 598
 599         return found;
 600 }
 601
 602 static bool
 603 smb2_is_valid_lease_break(char *buffer)
 604 {
 605         struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
 606         struct list_head *tmp, *tmp1, *tmp2;
 607         struct TCP_Server_Info *server;
 608         struct cifs_ses *ses;
 609         struct cifs_tcon *tcon;
 610         struct cifs_pending_open *open;
 611
 612         cifs_dbg(FYI, "Checking for lease break\n");
 613
 614         /* look up tcon based on tid & uid */
 615         spin_lock(&cifs_tcp_ses_lock);
 616         list_for_each(tmp, &cifs_tcp_ses_list) {
 617                 server = list_entry(tmp, struct TCP_Server_Info, tcp_ses_list);
 618
 619                 list_for_each(tmp1, &server->smb_ses_list) {
 620                         ses = list_entry(tmp1, struct cifs_ses, smb_ses_list);
 621
 622                         list_for_each(tmp2, &ses->tcon_list) {
 623                                 tcon = list_entry(tmp2, struct cifs_tcon,
 624                                                   tcon_list);
 625                                 spin_lock(&tcon->open_file_lock);
 626                                 cifs_stats_inc(
 627                                     &tcon->stats.cifs_stats.num_oplock_brks);
 628                                 if (smb2_tcon_has_lease(tcon, rsp)) {
 629                                         spin_unlock(&tcon->open_file_lock);
 630                                         spin_unlock(&cifs_tcp_ses_lock);
 631                                         return true;
 632                                 }
 633                                 open = smb2_tcon_find_pending_open_lease(tcon,
 634                                                                          rsp);
 635                                 if (open) {
 636                                         __u8 lease_key[SMB2_LEASE_KEY_SIZE];
 637                                         struct tcon_link *tlink;
 638
 639                                         tlink = cifs_get_tlink(open->tlink);
 640                                         memcpy(lease_key, open->lease_key,
 641                                                SMB2_LEASE_KEY_SIZE);
 642                                         spin_unlock(&tcon->open_file_lock);
 643                                         spin_unlock(&cifs_tcp_ses_lock);
 644                                         smb2_queue_pending_open_break(tlink,
 645                                                                       lease_key,
 646                                                                       rsp->NewLeaseState);
 647                                         return true;
 648                                 }
 649                                 spin_unlock(&tcon->open_file_lock);
 650
 651                                 if (tcon->crfid.is_valid &&
 652                                     !memcmp(rsp->LeaseKey,
 653                                             tcon->crfid.fid->lease_key,
 654                                             SMB2_LEASE_KEY_SIZE)) {
 655                                         INIT_WORK(&tcon->crfid.lease_break,
 656                                                   smb2_cached_lease_break);
 657                                         queue_work(cifsiod_wq,
 658                                                    &tcon->crfid.lease_break);
 659                                         spin_unlock(&cifs_tcp_ses_lock);
 660                                         return true;
 661                                 }
 662                         }
 663                 }
 664         }
 665         spin_unlock(&cifs_tcp_ses_lock);
 666         cifs_dbg(FYI, "Can not process lease break - no lease matched\n");
 667         return false;
 668 }
 669
 670 bool
 671 smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
 672 {
 673         struct smb2_oplock_break *rsp = (struct smb2_oplock_break *)buffer;
 674         struct list_head *tmp, *tmp1, *tmp2;
 675         struct cifs_ses *ses;
 676         struct cifs_tcon *tcon;
 677         struct cifsInodeInfo *cinode;
 678         struct cifsFileInfo *cfile;
 679
 680         cifs_dbg(FYI, "Checking for oplock break\n");
 681
 682         if (rsp->sync_hdr.Command != SMB2_OPLOCK_BREAK)
 683                 return false;
 684
 685         if (rsp->StructureSize !=
 686                                 smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
 687                 if (le16_to_cpu(rsp->StructureSize) == 44)
 688                         return smb2_is_valid_lease_break(buffer);
 689                 else
 690                         return false;
 691         }
 692
 693         cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel);
 694
 695         /* look up tcon based on tid & uid */
 696         spin_lock(&cifs_tcp_ses_lock);
 697         list_for_each(tmp, &server->smb_ses_list) {
 698                 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
 699
 700                 list_for_each(tmp1, &ses->tcon_list) {
 701                         tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
 702
 703                         spin_lock(&tcon->open_file_lock);
 704                         list_for_each(tmp2, &tcon->openFileList) {
 705                                 cfile = list_entry(tmp2, struct cifsFileInfo,
 706                                                      tlist);
 707                                 if (rsp->PersistentFid !=
 708                                     cfile->fid.persistent_fid ||
 709                                     rsp->VolatileFid !=
 710                                     cfile->fid.volatile_fid)
 711                                         continue;
 712
 713                                 cifs_dbg(FYI, "file id match, oplock break\n");
 714                                 cifs_stats_inc(
 715                                     &tcon->stats.cifs_stats.num_oplock_brks);
 716                                 cinode = CIFS_I(d_inode(cfile->dentry));
 717                                 spin_lock(&cfile->file_info_lock);
 718                                 if (!CIFS_CACHE_WRITE(cinode) &&
 719                                     rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
 720                                         cfile->oplock_break_cancelled = true;
 721                                 else
 722                                         cfile->oplock_break_cancelled = false;
 723
 724                                 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
 725                                         &cinode->flags);
 726
 727                                 cfile->oplock_epoch = 0;
 728                                 cfile->oplock_level = rsp->OplockLevel;
 729
 730                                 spin_unlock(&cfile->file_info_lock);
 731
 732                                 cifs_queue_oplock_break(cfile);
 733
 734                                 spin_unlock(&tcon->open_file_lock);
 735                                 spin_unlock(&cifs_tcp_ses_lock);
 736                                 return true;
 737                         }
 738                         spin_unlock(&tcon->open_file_lock);
 739                 }
 740         }
 741         spin_unlock(&cifs_tcp_ses_lock);
 742         cifs_dbg(FYI, "No file id matched, oplock break ignored\n");
 743         return true;
 744 }
 745
 746 void
 747 smb2_cancelled_close_fid(struct work_struct *work)
 748 {
 749         struct close_cancelled_open *cancelled = container_of(work,
 750                                         struct close_cancelled_open, work);
 751         struct cifs_tcon *tcon = cancelled->tcon;
 752         int rc;
 753
 754         if (cancelled->mid)
 755                 cifs_tcon_dbg(VFS, "Close unmatched open for MID:%llx\n",
 756                               cancelled->mid);
 757         else
 758                 cifs_tcon_dbg(VFS, "Close interrupted close\n");
 759
 760         rc = SMB2_close(0, tcon, cancelled->fid.persistent_fid,
 761                         cancelled->fid.volatile_fid);
 762         if (rc)
 763                 cifs_tcon_dbg(VFS, "Close cancelled mid failed rc:%d\n", rc);
 764
 765         cifs_put_tcon(tcon);
 766         kfree(cancelled);
 767 }
 768
 769 /*
 770  * Caller should already has an extra reference to @tcon
 771  * This function is used to queue work to close a handle to prevent leaks
 772  * on the server.
 773  * We handle two cases. If an open was interrupted after we sent the
 774  * SMB2_CREATE to the server but before we processed the reply, and second
 775  * if a close was interrupted before we sent the SMB2_CLOSE to the server.
 776  */
 777 static int
 778 __smb2_handle_cancelled_cmd(struct cifs_tcon *tcon, __u16 cmd, __u64 mid,
 779                             __u64 persistent_fid, __u64 volatile_fid)
 780 {
 781         struct close_cancelled_open *cancelled;
 782
 783         cancelled = kzalloc(sizeof(*cancelled), GFP_ATOMIC);
 784         if (!cancelled)
 785                 return -ENOMEM;
 786
 787         cancelled->fid.persistent_fid = persistent_fid;
 788         cancelled->fid.volatile_fid = volatile_fid;
 789         cancelled->tcon = tcon;
 790         cancelled->cmd = cmd;
 791         cancelled->mid = mid;
 792         INIT_WORK(&cancelled->work, smb2_cancelled_close_fid);
 793         WARN_ON(queue_work(cifsiod_wq, &cancelled->work) == false);
 794
 795         return 0;
 796 }
 797
 798 int
 799 smb2_handle_cancelled_close(struct cifs_tcon *tcon, __u64 persistent_fid,
 800                             __u64 volatile_fid)
 801 {
 802         int rc;
 803
 804         cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
 805         spin_lock(&cifs_tcp_ses_lock);
 806         if (tcon->tc_count <= 0) {
 807                 struct TCP_Server_Info *server = NULL;
 808
 809                 WARN_ONCE(tcon->tc_count < 0, "tcon refcount is negative");
 810                 spin_unlock(&cifs_tcp_ses_lock);
 811
 812                 if (tcon->ses)
 813                         server = tcon->ses->server;
 814
 815                 cifs_server_dbg(FYI, "tid=%u: tcon is closing, skipping async close retry of fid %llu %llu\n",
 816                                 tcon->tid, persistent_fid, volatile_fid);
 817
 818                 return 0;
 819         }
 820         tcon->tc_count++;
 821         spin_unlock(&cifs_tcp_ses_lock);
 822
 823         rc = __smb2_handle_cancelled_cmd(tcon, SMB2_CLOSE_HE, 0,
 824                                          persistent_fid, volatile_fid);
 825         if (rc)
 826                 cifs_put_tcon(tcon);
 827
 828         return rc;
 829 }
 830
 831 int
 832 smb2_handle_cancelled_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server)
 833 {
 834         struct smb2_sync_hdr *sync_hdr = mid->resp_buf;
 835         struct smb2_create_rsp *rsp = mid->resp_buf;
 836         struct cifs_tcon *tcon;
 837         int rc;
 838
 839         if ((mid->optype & CIFS_CP_CREATE_CLOSE_OP) || sync_hdr->Command != SMB2_CREATE ||
 840             sync_hdr->Status != STATUS_SUCCESS)
 841                 return 0;
 842
 843         tcon = smb2_find_smb_tcon(server, sync_hdr->SessionId,
 844                                   sync_hdr->TreeId);
 845         if (!tcon)
 846                 return -ENOENT;
 847
 848         rc = __smb2_handle_cancelled_cmd(tcon,
 849                                          le16_to_cpu(sync_hdr->Command),
 850                                          le64_to_cpu(sync_hdr->MessageId),
 851                                          rsp->PersistentFileId,
 852                                          rsp->VolatileFileId);
 853         if (rc)
 854                 cifs_put_tcon(tcon);
 855
 856         return rc;
 857 }
 858
 859 /**
 860  * smb311_update_preauth_hash - update @ses hash with the packet data in @iov
 861  *
 862  * Assumes @iov does not contain the rfc1002 length and iov[0] has the
 863  * SMB2 header.
 864  */
 865 int
 866 smb311_update_preauth_hash(struct cifs_ses *ses, struct kvec *iov, int nvec)
 867 {
 868         int i, rc;
 869         struct sdesc *d;
 870         struct smb2_sync_hdr *hdr;
 871         struct TCP_Server_Info *server = cifs_ses_server(ses);
 872
 873         hdr = (struct smb2_sync_hdr *)iov[0].iov_base;
 874         /* neg prot are always taken */
 875         if (hdr->Command == SMB2_NEGOTIATE)
 876                 goto ok;
 877
 878         /*
 879          * If we process a command which wasn't a negprot it means the
 880          * neg prot was already done, so the server dialect was set
 881          * and we can test it. Preauth requires 3.1.1 for now.
 882          */
 883         if (server->dialect != SMB311_PROT_ID)
 884                 return 0;
 885
 886         if (hdr->Command != SMB2_SESSION_SETUP)
 887                 return 0;
 888
 889         /* skip last sess setup response */
 890         if ((hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
 891             && (hdr->Status == NT_STATUS_OK
 892                 || (hdr->Status !=
 893                     cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))))
 894                 return 0;
 895
 896 ok:
 897         rc = smb311_crypto_shash_allocate(server);
 898         if (rc)
 899                 return rc;
 900
 901         d = server->secmech.sdescsha512;
 902         rc = crypto_shash_init(&d->shash);
 903         if (rc) {
 904                 cifs_dbg(VFS, "%s: Could not init sha512 shash\n", __func__);
 905                 return rc;
 906         }
 907
 908         rc = crypto_shash_update(&d->shash, ses->preauth_sha_hash,
 909                                  SMB2_PREAUTH_HASH_SIZE);
 910         if (rc) {
 911                 cifs_dbg(VFS, "%s: Could not update sha512 shash\n", __func__);
 912                 return rc;
 913         }
 914
 915         for (i = 0; i < nvec; i++) {
 916                 rc = crypto_shash_update(&d->shash,
 917                                          iov[i].iov_base, iov[i].iov_len);
 918                 if (rc) {
 919                         cifs_dbg(VFS, "%s: Could not update sha512 shash\n",
 920                                  __func__);
 921                         return rc;
 922                 }
 923         }
 924
 925         rc = crypto_shash_final(&d->shash, ses->preauth_sha_hash);
 926         if (rc) {
 927                 cifs_dbg(VFS, "%s: Could not finalize sha512 shash\n",
 928                          __func__);
 929                 return rc;
 930         }
 931
 932         return 0;
 933 }