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 #ifdef CONFIG_CIFS_SMB311
  97 static __u32 get_neg_ctxt_len(struct smb2_sync_hdr *hdr, __u32 len,
  98                               __u32 non_ctxlen,
  99                                 size_t hdr_preamble_size)
 100 {
 101         __u16 neg_count;
 102         __u32 nc_offset, size_of_pad_before_neg_ctxts;
 103         struct smb2_negotiate_rsp *pneg_rsp = (struct smb2_negotiate_rsp *)hdr;
 104
 105         /* Negotiate contexts are only valid for latest dialect SMB3.11 */
 106         neg_count = le16_to_cpu(pneg_rsp->NegotiateContextCount);
 107         if ((neg_count == 0) ||
 108            (pneg_rsp->DialectRevision != cpu_to_le16(SMB311_PROT_ID)))
 109                 return 0;
 110
 111         /* Make sure that negotiate contexts start after gss security blob */
 112         nc_offset = le32_to_cpu(pneg_rsp->NegotiateContextOffset);
 113         if (nc_offset < non_ctxlen - hdr_preamble_size /* RFC1001 len */) {
 114                 printk_once(KERN_WARNING "invalid negotiate context offset\n");
 115                 return 0;
 116         }
 117         size_of_pad_before_neg_ctxts = nc_offset -
 118                                         (non_ctxlen - hdr_preamble_size);
 119
 120         /* Verify that at least minimal negotiate contexts fit within frame */
 121         if (len < nc_offset + (neg_count * sizeof(struct smb2_neg_context))) {
 122                 printk_once(KERN_WARNING "negotiate context goes beyond end\n");
 123                 return 0;
 124         }
 125
 126         cifs_dbg(FYI, "length of negcontexts %d pad %d\n",
 127                 len - nc_offset, size_of_pad_before_neg_ctxts);
 128
 129         /* length of negcontexts including pad from end of sec blob to them */
 130         return (len - nc_offset) + size_of_pad_before_neg_ctxts;
 131 }
 132 #endif /* CIFS_SMB311 */
 133
 134 int
 135 smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *srvr)
 136 {
 137         struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)(buf + srvr->vals->header_preamble_size);
 138         struct smb2_sync_pdu *pdu = (struct smb2_sync_pdu *)shdr;
 139         __u64 mid;
 140         __u32 clc_len;  /* calculated length */
 141         int command;
 142         int pdu_size = sizeof(struct smb2_sync_pdu);
 143         int hdr_size = sizeof(struct smb2_sync_hdr);
 144
 145         /*
 146          * Add function to do table lookup of StructureSize by command
 147          * ie Validate the wct via smb2_struct_sizes table above
 148          */
 149         if (shdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM) {
 150                 struct smb2_transform_hdr *thdr =
 151                         (struct smb2_transform_hdr *)buf;
 152                 struct cifs_ses *ses = NULL;
 153                 struct list_head *tmp;
 154
 155                 /* decrypt frame now that it is completely read in */
 156                 spin_lock(&cifs_tcp_ses_lock);
 157                 list_for_each(tmp, &srvr->smb_ses_list) {
 158                         ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
 159                         if (ses->Suid == thdr->SessionId)
 160                                 break;
 161
 162                         ses = NULL;
 163                 }
 164                 spin_unlock(&cifs_tcp_ses_lock);
 165                 if (ses == NULL) {
 166                         cifs_dbg(VFS, "no decryption - session id not found\n");
 167                         return 1;
 168                 }
 169         }
 170
 171         mid = le64_to_cpu(shdr->MessageId);
 172         if (len < pdu_size) {
 173                 if ((len >= hdr_size)
 174                     && (shdr->Status != 0)) {
 175                         pdu->StructureSize2 = 0;
 176                         /*
 177                          * As with SMB/CIFS, on some error cases servers may
 178                          * not return wct properly
 179                          */
 180                         return 0;
 181                 } else {
 182                         cifs_dbg(VFS, "Length less than SMB header size\n");
 183                 }
 184                 return 1;
 185         }
 186         if (len > CIFSMaxBufSize + MAX_SMB2_HDR_SIZE -
 187             srvr->vals->header_preamble_size) {
 188                 cifs_dbg(VFS, "SMB length greater than maximum, mid=%llu\n",
 189                          mid);
 190                 return 1;
 191         }
 192
 193         if (check_smb2_hdr(shdr, mid))
 194                 return 1;
 195
 196         if (shdr->StructureSize != SMB2_HEADER_STRUCTURE_SIZE) {
 197                 cifs_dbg(VFS, "Illegal structure size %u\n",
 198                          le16_to_cpu(shdr->StructureSize));
 199                 return 1;
 200         }
 201
 202         command = le16_to_cpu(shdr->Command);
 203         if (command >= NUMBER_OF_SMB2_COMMANDS) {
 204                 cifs_dbg(VFS, "Illegal SMB2 command %d\n", command);
 205                 return 1;
 206         }
 207
 208         if (smb2_rsp_struct_sizes[command] != pdu->StructureSize2) {
 209                 if (command != SMB2_OPLOCK_BREAK_HE && (shdr->Status == 0 ||
 210                     pdu->StructureSize2 != SMB2_ERROR_STRUCTURE_SIZE2)) {
 211                         /* error packets have 9 byte structure size */
 212                         cifs_dbg(VFS, "Illegal response size %u for command %d\n",
 213                                  le16_to_cpu(pdu->StructureSize2), command);
 214                         return 1;
 215                 } else if (command == SMB2_OPLOCK_BREAK_HE
 216                            && (shdr->Status == 0)
 217                            && (le16_to_cpu(pdu->StructureSize2) != 44)
 218                            && (le16_to_cpu(pdu->StructureSize2) != 36)) {
 219                         /* special case for SMB2.1 lease break message */
 220                         cifs_dbg(VFS, "Illegal response size %d for oplock break\n",
 221                                  le16_to_cpu(pdu->StructureSize2));
 222                         return 1;
 223                 }
 224         }
 225
 226         clc_len = smb2_calc_size(buf, srvr);
 227
 228 #ifdef CONFIG_CIFS_SMB311
 229         if (shdr->Command == SMB2_NEGOTIATE)
 230                 clc_len += get_neg_ctxt_len(shdr, len, clc_len,
 231                                             srvr->vals->header_preamble_size);
 232 #endif /* SMB311 */
 233         if (len != clc_len) {
 234                 cifs_dbg(FYI, "Calculated size %u length %u mismatch mid %llu\n",
 235                          clc_len, len, mid);
 236                 /* create failed on symlink */
 237                 if (command == SMB2_CREATE_HE &&
 238                     shdr->Status == STATUS_STOPPED_ON_SYMLINK)
 239                         return 0;
 240                 /* Windows 7 server returns 24 bytes more */
 241                 if (clc_len + 24 == len && command == SMB2_OPLOCK_BREAK_HE)
 242                         return 0;
 243                 /* server can return one byte more due to implied bcc[0] */
 244                 if (clc_len == len + 1)
 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                  * Log the server error (once), but allow it and continue
 252                  * since the frame is parseable.
 253                  */
 254                 if (clc_len < len) {
 255                         printk_once(KERN_WARNING
 256                                 "SMB2 server sent bad RFC1001 len %d not %u\n",
 257                                 len, clc_len);
 258                         return 0;
 259                 }
 260
 261                 return 1;
 262         }
 263         return 0;
 264 }
 265
 266 /*
 267  * The size of the variable area depends on the offset and length fields
 268  * located in different fields for various SMB2 responses. SMB2 responses
 269  * with no variable length info, show an offset of zero for the offset field.
 270  */
 271 static const bool has_smb2_data_area[NUMBER_OF_SMB2_COMMANDS] = {
 272         /* SMB2_NEGOTIATE */ true,
 273         /* SMB2_SESSION_SETUP */ true,
 274         /* SMB2_LOGOFF */ false,
 275         /* SMB2_TREE_CONNECT */ false,
 276         /* SMB2_TREE_DISCONNECT */ false,
 277         /* SMB2_CREATE */ true,
 278         /* SMB2_CLOSE */ false,
 279         /* SMB2_FLUSH */ false,
 280         /* SMB2_READ */ true,
 281         /* SMB2_WRITE */ false,
 282         /* SMB2_LOCK */ false,
 283         /* SMB2_IOCTL */ true,
 284         /* SMB2_CANCEL */ false, /* BB CHECK this not listed in documentation */
 285         /* SMB2_ECHO */ false,
 286         /* SMB2_QUERY_DIRECTORY */ true,
 287         /* SMB2_CHANGE_NOTIFY */ true,
 288         /* SMB2_QUERY_INFO */ true,
 289         /* SMB2_SET_INFO */ false,
 290         /* SMB2_OPLOCK_BREAK */ false
 291 };
 292
 293 /*
 294  * Returns the pointer to the beginning of the data area. Length of the data
 295  * area and the offset to it (from the beginning of the smb are also returned.
 296  */
 297 char *
 298 smb2_get_data_area_len(int *off, int *len, struct smb2_hdr *hdr)
 299 {
 300         struct smb2_sync_hdr *shdr = get_sync_hdr(hdr);
 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 *)hdr)->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 *)hdr)->SecurityBufferOffset);
 319                 *len = le16_to_cpu(
 320                     ((struct smb2_negotiate_rsp *)hdr)->SecurityBufferLength);
 321                 break;
 322         case SMB2_SESSION_SETUP:
 323                 *off = le16_to_cpu(
 324                     ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferOffset);
 325                 *len = le16_to_cpu(
 326                     ((struct smb2_sess_setup_rsp *)hdr)->SecurityBufferLength);
 327                 break;
 328         case SMB2_CREATE:
 329                 *off = le32_to_cpu(
 330                     ((struct smb2_create_rsp *)hdr)->CreateContextsOffset);
 331                 *len = le32_to_cpu(
 332                     ((struct smb2_create_rsp *)hdr)->CreateContextsLength);
 333                 break;
 334         case SMB2_QUERY_INFO:
 335                 *off = le16_to_cpu(
 336                     ((struct smb2_query_info_rsp *)hdr)->OutputBufferOffset);
 337                 *len = le32_to_cpu(
 338                     ((struct smb2_query_info_rsp *)hdr)->OutputBufferLength);
 339                 break;
 340         case SMB2_READ:
 341                 *off = ((struct smb2_read_rsp *)hdr)->DataOffset;
 342                 *len = le32_to_cpu(((struct smb2_read_rsp *)hdr)->DataLength);
 343                 break;
 344         case SMB2_QUERY_DIRECTORY:
 345                 *off = le16_to_cpu(
 346                   ((struct smb2_query_directory_rsp *)hdr)->OutputBufferOffset);
 347                 *len = le32_to_cpu(
 348                   ((struct smb2_query_directory_rsp *)hdr)->OutputBufferLength);
 349                 break;
 350         case SMB2_IOCTL:
 351                 *off = le32_to_cpu(
 352                   ((struct smb2_ioctl_rsp *)hdr)->OutputOffset);
 353                 *len = le32_to_cpu(((struct smb2_ioctl_rsp *)hdr)->OutputCount);
 354                 break;
 355         case SMB2_CHANGE_NOTIFY:
 356         default:
 357                 /* BB FIXME for unimplemented cases above */
 358                 cifs_dbg(VFS, "no length check for command\n");
 359                 break;
 360         }
 361
 362         /*
 363          * Invalid length or offset probably means data area is invalid, but
 364          * we have little choice but to ignore the data area in this case.
 365          */
 366         if (*off > 4096) {
 367                 cifs_dbg(VFS, "offset %d too large, data area ignored\n", *off);
 368                 *len = 0;
 369                 *off = 0;
 370         } else if (*off < 0) {
 371                 cifs_dbg(VFS, "negative offset %d to data invalid ignore data area\n",
 372                          *off);
 373                 *off = 0;
 374                 *len = 0;
 375         } else if (*len < 0) {
 376                 cifs_dbg(VFS, "negative data length %d invalid, data area ignored\n",
 377                          *len);
 378                 *len = 0;
 379         } else if (*len > 128 * 1024) {
 380                 cifs_dbg(VFS, "data area larger than 128K: %d\n", *len);
 381                 *len = 0;
 382         }
 383
 384         /* return pointer to beginning of data area, ie offset from SMB start */
 385         if ((*off != 0) && (*len != 0))
 386                 return (char *)shdr + *off;
 387         else
 388                 return NULL;
 389 }
 390
 391 /*
 392  * Calculate the size of the SMB message based on the fixed header
 393  * portion, the number of word parameters and the data portion of the message.
 394  */
 395 unsigned int
 396 smb2_calc_size(void *buf, struct TCP_Server_Info *srvr)
 397 {
 398         struct smb2_pdu *pdu = (struct smb2_pdu *)buf;
 399         struct smb2_hdr *hdr = &pdu->hdr;
 400         struct smb2_sync_hdr *shdr = get_sync_hdr(hdr);
 401         int offset; /* the offset from the beginning of SMB to data area */
 402         int data_length; /* the length of the variable length data area */
 403         /* Structure Size has already been checked to make sure it is 64 */
 404         int len = srvr->vals->header_preamble_size + le16_to_cpu(shdr->StructureSize);
 405
 406         /*
 407          * StructureSize2, ie length of fixed parameter area has already
 408          * been checked to make sure it is the correct length.
 409          */
 410         len += le16_to_cpu(pdu->StructureSize2);
 411
 412         if (has_smb2_data_area[le16_to_cpu(shdr->Command)] == false)
 413                 goto calc_size_exit;
 414
 415         smb2_get_data_area_len(&offset, &data_length, hdr);
 416         cifs_dbg(FYI, "SMB2 data length %d offset %d\n", data_length, offset);
 417
 418         if (data_length > 0) {
 419                 /*
 420                  * Check to make sure that data area begins after fixed area,
 421                  * Note that last byte of the fixed area is part of data area
 422                  * for some commands, typically those with odd StructureSize,
 423                  * so we must add one to the calculation (and 4 to account for
 424                  * the size of the RFC1001 hdr.
 425                  */
 426                 if (offset + srvr->vals->header_preamble_size + 1 < len) {
 427                         cifs_dbg(VFS, "data area offset %zu overlaps SMB2 header %d\n",
 428                                  offset + srvr->vals->header_preamble_size + 1, len);
 429                         data_length = 0;
 430                 } else {
 431                         len = srvr->vals->header_preamble_size + 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 #ifdef CONFIG_CIFS_SMB311
 459         /* SMB311 POSIX extensions paths do not include leading slash */
 460         else if (cifs_sb_master_tcon(cifs_sb)->posix_extensions)
 461                 start_of_path = from + 1;
 462 #endif /* 311 */
 463         else
 464                 start_of_path = from;
 465
 466         to = cifs_strndup_to_utf16(start_of_path, PATH_MAX, &len,
 467                                    cifs_sb->local_nls, map_type);
 468         return to;
 469 }
 470
 471 __le32
 472 smb2_get_lease_state(struct cifsInodeInfo *cinode)
 473 {
 474         __le32 lease = 0;
 475
 476         if (CIFS_CACHE_WRITE(cinode))
 477                 lease |= SMB2_LEASE_WRITE_CACHING;
 478         if (CIFS_CACHE_HANDLE(cinode))
 479                 lease |= SMB2_LEASE_HANDLE_CACHING;
 480         if (CIFS_CACHE_READ(cinode))
 481                 lease |= SMB2_LEASE_READ_CACHING;
 482         return lease;
 483 }
 484
 485 struct smb2_lease_break_work {
 486         struct work_struct lease_break;
 487         struct tcon_link *tlink;
 488         __u8 lease_key[16];
 489         __le32 lease_state;
 490 };
 491
 492 static void
 493 cifs_ses_oplock_break(struct work_struct *work)
 494 {
 495         struct smb2_lease_break_work *lw = container_of(work,
 496                                 struct smb2_lease_break_work, lease_break);
 497         int rc;
 498
 499         rc = SMB2_lease_break(0, tlink_tcon(lw->tlink), lw->lease_key,
 500                               lw->lease_state);
 501         cifs_dbg(FYI, "Lease release rc %d\n", rc);
 502         cifs_put_tlink(lw->tlink);
 503         kfree(lw);
 504 }
 505
 506 static bool
 507 smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp,
 508                     struct smb2_lease_break_work *lw)
 509 {
 510         bool found;
 511         __u8 lease_state;
 512         struct list_head *tmp;
 513         struct cifsFileInfo *cfile;
 514         struct TCP_Server_Info *server = tcon->ses->server;
 515         struct cifs_pending_open *open;
 516         struct cifsInodeInfo *cinode;
 517         int ack_req = le32_to_cpu(rsp->Flags &
 518                                   SMB2_NOTIFY_BREAK_LEASE_FLAG_ACK_REQUIRED);
 519
 520         lease_state = le32_to_cpu(rsp->NewLeaseState);
 521
 522         list_for_each(tmp, &tcon->openFileList) {
 523                 cfile = list_entry(tmp, struct cifsFileInfo, tlist);
 524                 cinode = CIFS_I(d_inode(cfile->dentry));
 525
 526                 if (memcmp(cinode->lease_key, rsp->LeaseKey,
 527                                                         SMB2_LEASE_KEY_SIZE))
 528                         continue;
 529
 530                 cifs_dbg(FYI, "found in the open list\n");
 531                 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
 532                          le32_to_cpu(rsp->NewLeaseState));
 533
 534                 server->ops->set_oplock_level(cinode, lease_state, 0, NULL);
 535
 536                 if (ack_req)
 537                         cfile->oplock_break_cancelled = false;
 538                 else
 539                         cfile->oplock_break_cancelled = true;
 540
 541                 queue_work(cifsoplockd_wq, &cfile->oplock_break);
 542                 kfree(lw);
 543                 return true;
 544         }
 545
 546         found = false;
 547         list_for_each_entry(open, &tcon->pending_opens, olist) {
 548                 if (memcmp(open->lease_key, rsp->LeaseKey,
 549                            SMB2_LEASE_KEY_SIZE))
 550                         continue;
 551
 552                 if (!found && ack_req) {
 553                         found = true;
 554                         memcpy(lw->lease_key, open->lease_key,
 555                                SMB2_LEASE_KEY_SIZE);
 556                         lw->tlink = cifs_get_tlink(open->tlink);
 557                         queue_work(cifsiod_wq, &lw->lease_break);
 558                 }
 559
 560                 cifs_dbg(FYI, "found in the pending open list\n");
 561                 cifs_dbg(FYI, "lease key match, lease break 0x%x\n",
 562                          le32_to_cpu(rsp->NewLeaseState));
 563
 564                 open->oplock = lease_state;
 565         }
 566         return found;
 567 }
 568
 569 static bool
 570 smb2_is_valid_lease_break(char *buffer)
 571 {
 572         struct smb2_lease_break *rsp = (struct smb2_lease_break *)buffer;
 573         struct list_head *tmp, *tmp1, *tmp2;
 574         struct TCP_Server_Info *server;
 575         struct cifs_ses *ses;
 576         struct cifs_tcon *tcon;
 577         struct smb2_lease_break_work *lw;
 578
 579         lw = kmalloc(sizeof(struct smb2_lease_break_work), GFP_KERNEL);
 580         if (!lw)
 581                 return false;
 582
 583         INIT_WORK(&lw->lease_break, cifs_ses_oplock_break);
 584         lw->lease_state = rsp->NewLeaseState;
 585
 586         cifs_dbg(FYI, "Checking for lease break\n");
 587
 588         /* look up tcon based on tid & uid */
 589         spin_lock(&cifs_tcp_ses_lock);
 590         list_for_each(tmp, &cifs_tcp_ses_list) {
 591                 server = list_entry(tmp, struct TCP_Server_Info, tcp_ses_list);
 592
 593                 list_for_each(tmp1, &server->smb_ses_list) {
 594                         ses = list_entry(tmp1, struct cifs_ses, smb_ses_list);
 595
 596                         list_for_each(tmp2, &ses->tcon_list) {
 597                                 tcon = list_entry(tmp2, struct cifs_tcon,
 598                                                   tcon_list);
 599                                 spin_lock(&tcon->open_file_lock);
 600                                 cifs_stats_inc(
 601                                     &tcon->stats.cifs_stats.num_oplock_brks);
 602                                 if (smb2_tcon_has_lease(tcon, rsp, lw)) {
 603                                         spin_unlock(&tcon->open_file_lock);
 604                                         spin_unlock(&cifs_tcp_ses_lock);
 605                                         return true;
 606                                 }
 607                                 spin_unlock(&tcon->open_file_lock);
 608                         }
 609                 }
 610         }
 611         spin_unlock(&cifs_tcp_ses_lock);
 612         kfree(lw);
 613         cifs_dbg(FYI, "Can not process lease break - no lease matched\n");
 614         return false;
 615 }
 616
 617 bool
 618 smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
 619 {
 620         struct smb2_oplock_break_rsp *rsp = (struct smb2_oplock_break_rsp *)buffer;
 621         struct list_head *tmp, *tmp1, *tmp2;
 622         struct cifs_ses *ses;
 623         struct cifs_tcon *tcon;
 624         struct cifsInodeInfo *cinode;
 625         struct cifsFileInfo *cfile;
 626
 627         cifs_dbg(FYI, "Checking for oplock break\n");
 628
 629         if (rsp->hdr.sync_hdr.Command != SMB2_OPLOCK_BREAK)
 630                 return false;
 631
 632         if (rsp->StructureSize !=
 633                                 smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
 634                 if (le16_to_cpu(rsp->StructureSize) == 44)
 635                         return smb2_is_valid_lease_break(buffer);
 636                 else
 637                         return false;
 638         }
 639
 640         cifs_dbg(FYI, "oplock level 0x%x\n", rsp->OplockLevel);
 641
 642         /* look up tcon based on tid & uid */
 643         spin_lock(&cifs_tcp_ses_lock);
 644         list_for_each(tmp, &server->smb_ses_list) {
 645                 ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
 646                 list_for_each(tmp1, &ses->tcon_list) {
 647                         tcon = list_entry(tmp1, struct cifs_tcon, tcon_list);
 648
 649                         cifs_stats_inc(&tcon->stats.cifs_stats.num_oplock_brks);
 650                         spin_lock(&tcon->open_file_lock);
 651                         list_for_each(tmp2, &tcon->openFileList) {
 652                                 cfile = list_entry(tmp2, struct cifsFileInfo,
 653                                                      tlist);
 654                                 if (rsp->PersistentFid !=
 655                                     cfile->fid.persistent_fid ||
 656                                     rsp->VolatileFid !=
 657                                     cfile->fid.volatile_fid)
 658                                         continue;
 659
 660                                 cifs_dbg(FYI, "file id match, oplock break\n");
 661                                 cinode = CIFS_I(d_inode(cfile->dentry));
 662                                 spin_lock(&cfile->file_info_lock);
 663                                 if (!CIFS_CACHE_WRITE(cinode) &&
 664                                     rsp->OplockLevel == SMB2_OPLOCK_LEVEL_NONE)
 665                                         cfile->oplock_break_cancelled = true;
 666                                 else
 667                                         cfile->oplock_break_cancelled = false;
 668
 669                                 set_bit(CIFS_INODE_PENDING_OPLOCK_BREAK,
 670                                         &cinode->flags);
 671
 672                                 /*
 673                                  * Set flag if the server downgrades the oplock
 674                                  * to L2 else clear.
 675                                  */
 676                                 if (rsp->OplockLevel)
 677                                         set_bit(
 678                                            CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
 679                                            &cinode->flags);
 680                                 else
 681                                         clear_bit(
 682                                            CIFS_INODE_DOWNGRADE_OPLOCK_TO_L2,
 683                                            &cinode->flags);
 684                                 spin_unlock(&cfile->file_info_lock);
 685                                 queue_work(cifsoplockd_wq,
 686                                            &cfile->oplock_break);
 687
 688                                 spin_unlock(&tcon->open_file_lock);
 689                                 spin_unlock(&cifs_tcp_ses_lock);
 690                                 return true;
 691                         }
 692                         spin_unlock(&tcon->open_file_lock);
 693                         spin_unlock(&cifs_tcp_ses_lock);
 694                         cifs_dbg(FYI, "No matching file for oplock break\n");
 695                         return true;
 696                 }
 697         }
 698         spin_unlock(&cifs_tcp_ses_lock);
 699         cifs_dbg(FYI, "Can not process oplock break for non-existent connection\n");
 700         return false;
 701 }
 702
 703 void
 704 smb2_cancelled_close_fid(struct work_struct *work)
 705 {
 706         struct close_cancelled_open *cancelled = container_of(work,
 707                                         struct close_cancelled_open, work);
 708
 709         cifs_dbg(VFS, "Close unmatched open\n");
 710
 711         SMB2_close(0, cancelled->tcon, cancelled->fid.persistent_fid,
 712                    cancelled->fid.volatile_fid);
 713         cifs_put_tcon(cancelled->tcon);
 714         kfree(cancelled);
 715 }
 716
 717 int
 718 smb2_handle_cancelled_mid(char *buffer, struct TCP_Server_Info *server)
 719 {
 720         struct smb2_sync_hdr *sync_hdr = get_sync_hdr(buffer);
 721         struct smb2_create_rsp *rsp = (struct smb2_create_rsp *)buffer;
 722         struct cifs_tcon *tcon;
 723         struct close_cancelled_open *cancelled;
 724
 725         if (sync_hdr->Command != SMB2_CREATE ||
 726             sync_hdr->Status != STATUS_SUCCESS)
 727                 return 0;
 728
 729         cancelled = kzalloc(sizeof(*cancelled), GFP_KERNEL);
 730         if (!cancelled)
 731                 return -ENOMEM;
 732
 733         tcon = smb2_find_smb_tcon(server, sync_hdr->SessionId,
 734                                   sync_hdr->TreeId);
 735         if (!tcon) {
 736                 kfree(cancelled);
 737                 return -ENOENT;
 738         }
 739
 740         cancelled->fid.persistent_fid = rsp->PersistentFileId;
 741         cancelled->fid.volatile_fid = rsp->VolatileFileId;
 742         cancelled->tcon = tcon;
 743         INIT_WORK(&cancelled->work, smb2_cancelled_close_fid);
 744         queue_work(cifsiod_wq, &cancelled->work);
 745
 746         return 0;
 747 }
 748
 749 #ifdef CONFIG_CIFS_SMB311
 750 /**
 751  * smb311_update_preauth_hash - update @ses hash with the packet data in @iov
 752  *
 753  * Assumes @iov does not contain the rfc1002 length and iov[0] has the
 754  * SMB2 header.
 755  */
 756 int
 757 smb311_update_preauth_hash(struct cifs_ses *ses, struct kvec *iov, int nvec)
 758 {
 759         int i, rc;
 760         struct sdesc *d;
 761         struct smb2_sync_hdr *hdr;
 762
 763         if (ses->server->tcpStatus == CifsGood) {
 764                 /* skip non smb311 connections */
 765                 if (ses->server->dialect != SMB311_PROT_ID)
 766                         return 0;
 767
 768                 /* skip last sess setup response */
 769                 hdr = (struct smb2_sync_hdr *)iov[0].iov_base;
 770                 if (hdr->Flags & SMB2_FLAGS_SIGNED)
 771                         return 0;
 772         }
 773
 774         rc = smb311_crypto_shash_allocate(ses->server);
 775         if (rc)
 776                 return rc;
 777
 778         d = ses->server->secmech.sdescsha512;
 779         rc = crypto_shash_init(&d->shash);
 780         if (rc) {
 781                 cifs_dbg(VFS, "%s: could not init sha512 shash\n", __func__);
 782                 return rc;
 783         }
 784
 785         rc = crypto_shash_update(&d->shash, ses->preauth_sha_hash,
 786                                  SMB2_PREAUTH_HASH_SIZE);
 787         if (rc) {
 788                 cifs_dbg(VFS, "%s: could not update sha512 shash\n", __func__);
 789                 return rc;
 790         }
 791
 792         for (i = 0; i < nvec; i++) {
 793                 rc = crypto_shash_update(&d->shash,
 794                                          iov[i].iov_base, iov[i].iov_len);
 795                 if (rc) {
 796                         cifs_dbg(VFS, "%s: could not update sha512 shash\n",
 797                                  __func__);
 798                         return rc;
 799                 }
 800         }
 801
 802         rc = crypto_shash_final(&d->shash, ses->preauth_sha_hash);
 803         if (rc) {
 804                 cifs_dbg(VFS, "%s: could not finalize sha512 shash\n",
 805                          __func__);
 806                 return rc;
 807         }
 808
 809         return 0;
 810 }
 811 #endif