fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/pagemap.h>
  37 #include <linux/xattr.h>
  38 #include "smb2pdu.h"
  39 #include "cifsglob.h"
  40 #include "cifsacl.h"
  41 #include "cifsproto.h"
  42 #include "smb2proto.h"
  43 #include "cifs_unicode.h"
  44 #include "cifs_debug.h"
  45 #include "ntlmssp.h"
  46 #include "smb2status.h"
  47 #include "smb2glob.h"
  48 #include "cifspdu.h"
  49 #include "cifs_spnego.h"
  50
  51 /*
  52  *  The following table defines the expected "StructureSize" of SMB2 requests
  53  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  54  *
  55  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  56  *  indexed by command in host byte order.
  57  */
  58 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  59         /* SMB2_NEGOTIATE */ 36,
  60         /* SMB2_SESSION_SETUP */ 25,
  61         /* SMB2_LOGOFF */ 4,
  62         /* SMB2_TREE_CONNECT */ 9,
  63         /* SMB2_TREE_DISCONNECT */ 4,
  64         /* SMB2_CREATE */ 57,
  65         /* SMB2_CLOSE */ 24,
  66         /* SMB2_FLUSH */ 24,
  67         /* SMB2_READ */ 49,
  68         /* SMB2_WRITE */ 49,
  69         /* SMB2_LOCK */ 48,
  70         /* SMB2_IOCTL */ 57,
  71         /* SMB2_CANCEL */ 4,
  72         /* SMB2_ECHO */ 4,
  73         /* SMB2_QUERY_DIRECTORY */ 33,
  74         /* SMB2_CHANGE_NOTIFY */ 32,
  75         /* SMB2_QUERY_INFO */ 41,
  76         /* SMB2_SET_INFO */ 33,
  77         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  78 };
  79
  80
  81 static void
  82 smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
  83                   const struct cifs_tcon *tcon)
  84 {
  85         struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
  86         char *temp = (char *)hdr;
  87         /* lookup word count ie StructureSize from table */
  88         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
  89
  90         /*
  91          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
  92          * largest operations (Create)
  93          */
  94         memset(temp, 0, 256);
  95
  96         /* Note this is only network field converted to big endian */
  97         hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
  98                         - 4 /*  RFC 1001 length field itself not counted */);
  99
 100         hdr->ProtocolId[0] = 0xFE;
 101         hdr->ProtocolId[1] = 'S';
 102         hdr->ProtocolId[2] = 'M';
 103         hdr->ProtocolId[3] = 'B';
 104         hdr->StructureSize = cpu_to_le16(64);
 105         hdr->Command = smb2_cmd;
 106         hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
 107         hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 108
 109         if (!tcon)
 110                 goto out;
 111
 112         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 113         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 114         if ((tcon->ses) && (tcon->ses->server) &&
 115             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 116                 hdr->CreditCharge = cpu_to_le16(1);
 117         /* else CreditCharge MBZ */
 118
 119         hdr->TreeId = tcon->tid;
 120         /* Uid is not converted */
 121         if (tcon->ses)
 122                 hdr->SessionId = tcon->ses->Suid;
 123
 124         /*
 125          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 126          * to pass the path on the Open SMB prefixed by \\server\share.
 127          * Not sure when we would need to do the augmented path (if ever) and
 128          * setting this flag breaks the SMB2 open operation since it is
 129          * illegal to send an empty path name (without \\server\share prefix)
 130          * when the DFS flag is set in the SMB open header. We could
 131          * consider setting the flag on all operations other than open
 132          * but it is safer to net set it for now.
 133          */
 134 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 135                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 136
 137         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
 138                 hdr->Flags |= SMB2_FLAGS_SIGNED;
 139 out:
 140         pdu->StructureSize2 = cpu_to_le16(parmsize);
 141         return;
 142 }
 143
 144 static int
 145 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 146 {
 147         int rc = 0;
 148         struct nls_table *nls_codepage;
 149         struct cifs_ses *ses;
 150         struct TCP_Server_Info *server;
 151
 152         /*
 153          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 154          * check for tcp and smb session status done differently
 155          * for those three - in the calling routine.
 156          */
 157         if (tcon == NULL)
 158                 return rc;
 159
 160         if (smb2_command == SMB2_TREE_CONNECT)
 161                 return rc;
 162
 163         if (tcon->tidStatus == CifsExiting) {
 164                 /*
 165                  * only tree disconnect, open, and write,
 166                  * (and ulogoff which does not have tcon)
 167                  * are allowed as we start force umount.
 168                  */
 169                 if ((smb2_command != SMB2_WRITE) &&
 170                    (smb2_command != SMB2_CREATE) &&
 171                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 172                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 173                                  smb2_command);
 174                         return -ENODEV;
 175                 }
 176         }
 177         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 178             (!tcon->ses->server))
 179                 return -EIO;
 180
 181         ses = tcon->ses;
 182         server = ses->server;
 183
 184         /*
 185          * Give demultiplex thread up to 10 seconds to reconnect, should be
 186          * greater than cifs socket timeout which is 7 seconds
 187          */
 188         while (server->tcpStatus == CifsNeedReconnect) {
 189                 /*
 190                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 191                  * here since they are implicitly done when session drops.
 192                  */
 193                 switch (smb2_command) {
 194                 /*
 195                  * BB Should we keep oplock break and add flush to exceptions?
 196                  */
 197                 case SMB2_TREE_DISCONNECT:
 198                 case SMB2_CANCEL:
 199                 case SMB2_CLOSE:
 200                 case SMB2_OPLOCK_BREAK:
 201                         return -EAGAIN;
 202                 }
 203
 204                 wait_event_interruptible_timeout(server->response_q,
 205                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 206
 207                 /* are we still trying to reconnect? */
 208                 if (server->tcpStatus != CifsNeedReconnect)
 209                         break;
 210
 211                 /*
 212                  * on "soft" mounts we wait once. Hard mounts keep
 213                  * retrying until process is killed or server comes
 214                  * back on-line
 215                  */
 216                 if (!tcon->retry) {
 217                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 218                         return -EHOSTDOWN;
 219                 }
 220         }
 221
 222         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 223                 return rc;
 224
 225         nls_codepage = load_nls_default();
 226
 227         /*
 228          * need to prevent multiple threads trying to simultaneously reconnect
 229          * the same SMB session
 230          */
 231         mutex_lock(&tcon->ses->session_mutex);
 232         rc = cifs_negotiate_protocol(0, tcon->ses);
 233         if (!rc && tcon->ses->need_reconnect)
 234                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 235
 236         if (rc || !tcon->need_reconnect) {
 237                 mutex_unlock(&tcon->ses->session_mutex);
 238                 goto out;
 239         }
 240
 241         cifs_mark_open_files_invalid(tcon);
 242         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 243         mutex_unlock(&tcon->ses->session_mutex);
 244         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 245         if (rc)
 246                 goto out;
 247         atomic_inc(&tconInfoReconnectCount);
 248 out:
 249         /*
 250          * Check if handle based operation so we know whether we can continue
 251          * or not without returning to caller to reset file handle.
 252          */
 253         /*
 254          * BB Is flush done by server on drop of tcp session? Should we special
 255          * case it and skip above?
 256          */
 257         switch (smb2_command) {
 258         case SMB2_FLUSH:
 259         case SMB2_READ:
 260         case SMB2_WRITE:
 261         case SMB2_LOCK:
 262         case SMB2_IOCTL:
 263         case SMB2_QUERY_DIRECTORY:
 264         case SMB2_CHANGE_NOTIFY:
 265         case SMB2_QUERY_INFO:
 266         case SMB2_SET_INFO:
 267                 return -EAGAIN;
 268         }
 269         unload_nls(nls_codepage);
 270         return rc;
 271 }
 272
 273 /*
 274  * Allocate and return pointer to an SMB request hdr, and set basic
 275  * SMB information in the SMB header. If the return code is zero, this
 276  * function must have filled in request_buf pointer.
 277  */
 278 static int
 279 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 280                 void **request_buf)
 281 {
 282         int rc = 0;
 283
 284         rc = smb2_reconnect(smb2_command, tcon);
 285         if (rc)
 286                 return rc;
 287
 288         /* BB eventually switch this to SMB2 specific small buf size */
 289         *request_buf = cifs_small_buf_get();
 290         if (*request_buf == NULL) {
 291                 /* BB should we add a retry in here if not a writepage? */
 292                 return -ENOMEM;
 293         }
 294
 295         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
 296
 297         if (tcon != NULL) {
 298 #ifdef CONFIG_CIFS_STATS2
 299                 uint16_t com_code = le16_to_cpu(smb2_command);
 300                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 301 #endif
 302                 cifs_stats_inc(&tcon->num_smbs_sent);
 303         }
 304
 305         return rc;
 306 }
 307
 308 #ifdef CONFIG_CIFS_SMB311
 309 /* offset is sizeof smb2_negotiate_req - 4 but rounded up to 8 bytes */
 310 #define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) - 4 */
 311
 312
 313 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
 314 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
 315
 316 static void
 317 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 318 {
 319         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 320         pneg_ctxt->DataLength = cpu_to_le16(38);
 321         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 322         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 323         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 324         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 325 }
 326
 327 static void
 328 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 329 {
 330         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 331         pneg_ctxt->DataLength = cpu_to_le16(6);
 332         pneg_ctxt->CipherCount = cpu_to_le16(2);
 333         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 334         pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 335 }
 336
 337 static void
 338 assemble_neg_contexts(struct smb2_negotiate_req *req)
 339 {
 340
 341         /* +4 is to account for the RFC1001 len field */
 342         char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT + 4;
 343
 344         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 345         /* Add 2 to size to round to 8 byte boundary */
 346         pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
 347         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 348         req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
 349         req->NegotiateContextCount = cpu_to_le16(2);
 350         inc_rfc1001_len(req, 4 + sizeof(struct smb2_preauth_neg_context) + 2
 351                         + sizeof(struct smb2_encryption_neg_context)); /* calculate hash */
 352 }
 353 #else
 354 static void assemble_neg_contexts(struct smb2_negotiate_req *req)
 355 {
 356         return;
 357 }
 358 #endif /* SMB311 */
 359
 360
 361 /*
 362  *
 363  *      SMB2 Worker functions follow:
 364  *
 365  *      The general structure of the worker functions is:
 366  *      1) Call smb2_init (assembles SMB2 header)
 367  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 368  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 369  *      4) Decode SMB2 command specific fields in the fixed length area
 370  *      5) Decode variable length data area (if any for this SMB2 command type)
 371  *      6) Call free smb buffer
 372  *      7) return
 373  *
 374  */
 375
 376 int
 377 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 378 {
 379         struct smb2_negotiate_req *req;
 380         struct smb2_negotiate_rsp *rsp;
 381         struct kvec iov[1];
 382         int rc = 0;
 383         int resp_buftype;
 384         struct TCP_Server_Info *server = ses->server;
 385         int blob_offset, blob_length;
 386         char *security_blob;
 387         int flags = CIFS_NEG_OP;
 388
 389         cifs_dbg(FYI, "Negotiate protocol\n");
 390
 391         if (!server) {
 392                 WARN(1, "%s: server is NULL!\n", __func__);
 393                 return -EIO;
 394         }
 395
 396         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 397         if (rc)
 398                 return rc;
 399
 400         req->hdr.SessionId = 0;
 401
 402         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 403
 404         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
 405         inc_rfc1001_len(req, 2);
 406
 407         /* only one of SMB2 signing flags may be set in SMB2 request */
 408         if (ses->sign)
 409                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 410         else if (global_secflags & CIFSSEC_MAY_SIGN)
 411                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 412         else
 413                 req->SecurityMode = 0;
 414
 415         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 416
 417         /* ClientGUID must be zero for SMB2.02 dialect */
 418         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 419                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 420         else {
 421                 memcpy(req->ClientGUID, server->client_guid,
 422                         SMB2_CLIENT_GUID_SIZE);
 423                 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
 424                         assemble_neg_contexts(req);
 425         }
 426         iov[0].iov_base = (char *)req;
 427         /* 4 for rfc1002 length field */
 428         iov[0].iov_len = get_rfc1002_length(req) + 4;
 429
 430         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 431
 432         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 433         /*
 434          * No tcon so can't do
 435          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 436          */
 437         if (rc != 0)
 438                 goto neg_exit;
 439
 440         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 441
 442         /* BB we may eventually want to match the negotiated vs. requested
 443            dialect, even though we are only requesting one at a time */
 444         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 445                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 446         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 447                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 448         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 449                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 450         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 451                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 452 #ifdef CONFIG_CIFS_SMB311
 453         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 454                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 455 #endif /* SMB311 */
 456         else {
 457                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 458                          le16_to_cpu(rsp->DialectRevision));
 459                 rc = -EIO;
 460                 goto neg_exit;
 461         }
 462         server->dialect = le16_to_cpu(rsp->DialectRevision);
 463
 464         /* SMB2 only has an extended negflavor */
 465         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 466         /* set it to the maximum buffer size value we can send with 1 credit */
 467         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 468                                SMB2_MAX_BUFFER_SIZE);
 469         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 470         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 471         /* BB Do we need to validate the SecurityMode? */
 472         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 473         server->capabilities = le32_to_cpu(rsp->Capabilities);
 474         /* Internal types */
 475         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 476
 477         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 478                                                &rsp->hdr);
 479         /*
 480          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 481          * for us will be
 482          *      ses->sectype = RawNTLMSSP;
 483          * but for time being this is our only auth choice so doesn't matter.
 484          * We just found a server which sets blob length to zero expecting raw.
 485          */
 486         if (blob_length == 0)
 487                 cifs_dbg(FYI, "missing security blob on negprot\n");
 488
 489         rc = cifs_enable_signing(server, ses->sign);
 490         if (rc)
 491                 goto neg_exit;
 492         if (blob_length) {
 493                 rc = decode_negTokenInit(security_blob, blob_length, server);
 494                 if (rc == 1)
 495                         rc = 0;
 496                 else if (rc == 0)
 497                         rc = -EIO;
 498         }
 499 neg_exit:
 500         free_rsp_buf(resp_buftype, rsp);
 501         return rc;
 502 }
 503
 504 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 505 {
 506         int rc = 0;
 507         struct validate_negotiate_info_req vneg_inbuf;
 508         struct validate_negotiate_info_rsp *pneg_rsp;
 509         u32 rsplen;
 510
 511         cifs_dbg(FYI, "validate negotiate\n");
 512
 513         /*
 514          * validation ioctl must be signed, so no point sending this if we
 515          * can not sign it.  We could eventually change this to selectively
 516          * sign just this, the first and only signed request on a connection.
 517          * This is good enough for now since a user who wants better security
 518          * would also enable signing on the mount. Having validation of
 519          * negotiate info for signed connections helps reduce attack vectors
 520          */
 521         if (tcon->ses->server->sign == false)
 522                 return 0; /* validation requires signing */
 523
 524         vneg_inbuf.Capabilities =
 525                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 526         memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
 527                                         SMB2_CLIENT_GUID_SIZE);
 528
 529         if (tcon->ses->sign)
 530                 vneg_inbuf.SecurityMode =
 531                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 532         else if (global_secflags & CIFSSEC_MAY_SIGN)
 533                 vneg_inbuf.SecurityMode =
 534                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 535         else
 536                 vneg_inbuf.SecurityMode = 0;
 537
 538         vneg_inbuf.DialectCount = cpu_to_le16(1);
 539         vneg_inbuf.Dialects[0] =
 540                 cpu_to_le16(tcon->ses->server->vals->protocol_id);
 541
 542         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 543                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 544                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
 545                 (char **)&pneg_rsp, &rsplen);
 546
 547         if (rc != 0) {
 548                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 549                 return -EIO;
 550         }
 551
 552         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
 553                 cifs_dbg(VFS, "invalid size of protocol negotiate response\n");
 554                 return -EIO;
 555         }
 556
 557         /* check validate negotiate info response matches what we got earlier */
 558         if (pneg_rsp->Dialect !=
 559                         cpu_to_le16(tcon->ses->server->vals->protocol_id))
 560                 goto vneg_out;
 561
 562         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 563                 goto vneg_out;
 564
 565         /* do not validate server guid because not saved at negprot time yet */
 566
 567         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 568               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 569                 goto vneg_out;
 570
 571         /* validate negotiate successful */
 572         cifs_dbg(FYI, "validate negotiate info successful\n");
 573         return 0;
 574
 575 vneg_out:
 576         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 577         return -EIO;
 578 }
 579
 580 int
 581 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 582                 const struct nls_table *nls_cp)
 583 {
 584         struct smb2_sess_setup_req *req;
 585         struct smb2_sess_setup_rsp *rsp = NULL;
 586         struct kvec iov[2];
 587         int rc = 0;
 588         int resp_buftype = CIFS_NO_BUFFER;
 589         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 590         struct TCP_Server_Info *server = ses->server;
 591         u16 blob_length = 0;
 592         struct key *spnego_key = NULL;
 593         char *security_blob = NULL;
 594         char *ntlmssp_blob = NULL;
 595         bool use_spnego = false; /* else use raw ntlmssp */
 596
 597         cifs_dbg(FYI, "Session Setup\n");
 598
 599         if (!server) {
 600                 WARN(1, "%s: server is NULL!\n", __func__);
 601                 return -EIO;
 602         }
 603
 604         /*
 605          * If we are here due to reconnect, free per-smb session key
 606          * in case signing was required.
 607          */
 608         kfree(ses->auth_key.response);
 609         ses->auth_key.response = NULL;
 610
 611         /*
 612          * If memory allocation is successful, caller of this function
 613          * frees it.
 614          */
 615         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 616         if (!ses->ntlmssp)
 617                 return -ENOMEM;
 618         ses->ntlmssp->sesskey_per_smbsess = true;
 619
 620         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
 621         if (ses->sectype != Kerberos && ses->sectype != RawNTLMSSP)
 622                 ses->sectype = RawNTLMSSP;
 623
 624 ssetup_ntlmssp_authenticate:
 625         if (phase == NtLmChallenge)
 626                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 627
 628         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 629         if (rc)
 630                 return rc;
 631
 632         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 633         req->Flags = 0; /* MBZ */
 634         /* to enable echos and oplocks */
 635         req->hdr.CreditRequest = cpu_to_le16(3);
 636
 637         /* only one of SMB2 signing flags may be set in SMB2 request */
 638         if (server->sign)
 639                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 640         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 641                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 642         else
 643                 req->SecurityMode = 0;
 644
 645         req->Capabilities = 0;
 646         req->Channel = 0; /* MBZ */
 647
 648         iov[0].iov_base = (char *)req;
 649         /* 4 for rfc1002 length field and 1 for pad */
 650         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 651
 652         if (ses->sectype == Kerberos) {
 653 #ifdef CONFIG_CIFS_UPCALL
 654                 struct cifs_spnego_msg *msg;
 655
 656                 spnego_key = cifs_get_spnego_key(ses);
 657                 if (IS_ERR(spnego_key)) {
 658                         rc = PTR_ERR(spnego_key);
 659                         spnego_key = NULL;
 660                         goto ssetup_exit;
 661                 }
 662
 663                 msg = spnego_key->payload.data;
 664                 /*
 665                  * check version field to make sure that cifs.upcall is
 666                  * sending us a response in an expected form
 667                  */
 668                 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
 669                         cifs_dbg(VFS,
 670                                   "bad cifs.upcall version. Expected %d got %d",
 671                                   CIFS_SPNEGO_UPCALL_VERSION, msg->version);
 672                         rc = -EKEYREJECTED;
 673                         goto ssetup_exit;
 674                 }
 675                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
 676                                                  GFP_KERNEL);
 677                 if (!ses->auth_key.response) {
 678                         cifs_dbg(VFS,
 679                                 "Kerberos can't allocate (%u bytes) memory",
 680                                 msg->sesskey_len);
 681                         rc = -ENOMEM;
 682                         goto ssetup_exit;
 683                 }
 684                 ses->auth_key.len = msg->sesskey_len;
 685                 blob_length = msg->secblob_len;
 686                 iov[1].iov_base = msg->data + msg->sesskey_len;
 687                 iov[1].iov_len = blob_length;
 688 #else
 689                 rc = -EOPNOTSUPP;
 690                 goto ssetup_exit;
 691 #endif /* CONFIG_CIFS_UPCALL */
 692         } else if (phase == NtLmNegotiate) { /* if not krb5 must be ntlmssp */
 693                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 694                                        GFP_KERNEL);
 695                 if (ntlmssp_blob == NULL) {
 696                         rc = -ENOMEM;
 697                         goto ssetup_exit;
 698                 }
 699                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 700                 if (use_spnego) {
 701                         /* blob_length = build_spnego_ntlmssp_blob(
 702                                         &security_blob,
 703                                         sizeof(struct _NEGOTIATE_MESSAGE),
 704                                         ntlmssp_blob); */
 705                         /* BB eventually need to add this */
 706                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 707                         rc = -EOPNOTSUPP;
 708                         kfree(ntlmssp_blob);
 709                         goto ssetup_exit;
 710                 } else {
 711                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 712                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 713                         security_blob = ntlmssp_blob;
 714                 }
 715                 iov[1].iov_base = security_blob;
 716                 iov[1].iov_len = blob_length;
 717         } else if (phase == NtLmAuthenticate) {
 718                 req->hdr.SessionId = ses->Suid;
 719                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 720                                        GFP_KERNEL);
 721                 if (ntlmssp_blob == NULL) {
 722                         rc = -ENOMEM;
 723                         goto ssetup_exit;
 724                 }
 725                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 726                                              nls_cp);
 727                 if (rc) {
 728                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
 729                                  rc);
 730                         goto ssetup_exit; /* BB double check error handling */
 731                 }
 732                 if (use_spnego) {
 733                         /* blob_length = build_spnego_ntlmssp_blob(
 734                                                         &security_blob,
 735                                                         blob_length,
 736                                                         ntlmssp_blob); */
 737                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 738                         rc = -EOPNOTSUPP;
 739                         kfree(ntlmssp_blob);
 740                         goto ssetup_exit;
 741                 } else {
 742                         security_blob = ntlmssp_blob;
 743                 }
 744                 iov[1].iov_base = security_blob;
 745                 iov[1].iov_len = blob_length;
 746         } else {
 747                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
 748                 rc = -EIO;
 749                 goto ssetup_exit;
 750         }
 751
 752         /* Testing shows that buffer offset must be at location of Buffer[0] */
 753         req->SecurityBufferOffset =
 754                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 755                                             1 /* pad */ - 4 /* rfc1001 len */);
 756         req->SecurityBufferLength = cpu_to_le16(blob_length);
 757
 758         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 759
 760         /* BB add code to build os and lm fields */
 761
 762         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 763                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 764
 765         kfree(security_blob);
 766         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 767         ses->Suid = rsp->hdr.SessionId;
 768         if (resp_buftype != CIFS_NO_BUFFER &&
 769             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 770                 if (phase != NtLmNegotiate) {
 771                         cifs_dbg(VFS, "Unexpected more processing error\n");
 772                         goto ssetup_exit;
 773                 }
 774                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 775                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 776                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 777                                  le16_to_cpu(rsp->SecurityBufferOffset));
 778                         rc = -EIO;
 779                         goto ssetup_exit;
 780                 }
 781
 782                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 783                 phase = NtLmChallenge; /* process ntlmssp challenge */
 784                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 785                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 786                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 787         }
 788
 789         /*
 790          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 791          * but at least the raw NTLMSSP case works.
 792          */
 793         /*
 794          * No tcon so can't do
 795          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 796          */
 797         if (rc != 0)
 798                 goto ssetup_exit;
 799
 800         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 801         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
 802                 cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
 803 ssetup_exit:
 804         free_rsp_buf(resp_buftype, rsp);
 805
 806         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 807         if ((phase == NtLmChallenge) && (rc == 0))
 808                 goto ssetup_ntlmssp_authenticate;
 809
 810         if (!rc) {
 811                 mutex_lock(&server->srv_mutex);
 812                 if (server->sign && server->ops->generate_signingkey) {
 813                         rc = server->ops->generate_signingkey(ses);
 814                         kfree(ses->auth_key.response);
 815                         ses->auth_key.response = NULL;
 816                         if (rc) {
 817                                 cifs_dbg(FYI,
 818                                         "SMB3 session key generation failed\n");
 819                                 mutex_unlock(&server->srv_mutex);
 820                                 goto keygen_exit;
 821                         }
 822                 }
 823                 if (!server->session_estab) {
 824                         server->sequence_number = 0x2;
 825                         server->session_estab = true;
 826                 }
 827                 mutex_unlock(&server->srv_mutex);
 828
 829                 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 830                 spin_lock(&GlobalMid_Lock);
 831                 ses->status = CifsGood;
 832                 ses->need_reconnect = false;
 833                 spin_unlock(&GlobalMid_Lock);
 834         }
 835
 836 keygen_exit:
 837         if (!server->sign) {
 838                 kfree(ses->auth_key.response);
 839                 ses->auth_key.response = NULL;
 840         }
 841         if (spnego_key) {
 842                 key_invalidate(spnego_key);
 843                 key_put(spnego_key);
 844         }
 845         kfree(ses->ntlmssp);
 846
 847         return rc;
 848 }
 849
 850 int
 851 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 852 {
 853         struct smb2_logoff_req *req; /* response is also trivial struct */
 854         int rc = 0;
 855         struct TCP_Server_Info *server;
 856
 857         cifs_dbg(FYI, "disconnect session %p\n", ses);
 858
 859         if (ses && (ses->server))
 860                 server = ses->server;
 861         else
 862                 return -EIO;
 863
 864         /* no need to send SMB logoff if uid already closed due to reconnect */
 865         if (ses->need_reconnect)
 866                 goto smb2_session_already_dead;
 867
 868         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 869         if (rc)
 870                 return rc;
 871
 872          /* since no tcon, smb2_init can not do this, so do here */
 873         req->hdr.SessionId = ses->Suid;
 874         if (server->sign)
 875                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 876
 877         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 878         /*
 879          * No tcon so can't do
 880          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 881          */
 882
 883 smb2_session_already_dead:
 884         return rc;
 885 }
 886
 887 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 888 {
 889         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 890 }
 891
 892 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 893
 894 /* These are similar values to what Windows uses */
 895 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
 896 {
 897         tcon->max_chunks = 256;
 898         tcon->max_bytes_chunk = 1048576;
 899         tcon->max_bytes_copy = 16777216;
 900 }
 901
 902 int
 903 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 904           struct cifs_tcon *tcon, const struct nls_table *cp)
 905 {
 906         struct smb2_tree_connect_req *req;
 907         struct smb2_tree_connect_rsp *rsp = NULL;
 908         struct kvec iov[2];
 909         int rc = 0;
 910         int resp_buftype;
 911         int unc_path_len;
 912         struct TCP_Server_Info *server;
 913         __le16 *unc_path = NULL;
 914
 915         cifs_dbg(FYI, "TCON\n");
 916
 917         if ((ses->server) && tree)
 918                 server = ses->server;
 919         else
 920                 return -EIO;
 921
 922         if (tcon && tcon->bad_network_name)
 923                 return -ENOENT;
 924
 925         if ((tcon && tcon->seal) &&
 926             ((ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION) == 0)) {
 927                 cifs_dbg(VFS, "encryption requested but no server support");
 928                 return -EOPNOTSUPP;
 929         }
 930
 931         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 932         if (unc_path == NULL)
 933                 return -ENOMEM;
 934
 935         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 936         unc_path_len *= 2;
 937         if (unc_path_len < 2) {
 938                 kfree(unc_path);
 939                 return -EINVAL;
 940         }
 941
 942         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 943         if (rc) {
 944                 kfree(unc_path);
 945                 return rc;
 946         }
 947
 948         if (tcon == NULL) {
 949                 /* since no tcon, smb2_init can not do this, so do here */
 950                 req->hdr.SessionId = ses->Suid;
 951                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 952                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 953         }
 954
 955         iov[0].iov_base = (char *)req;
 956         /* 4 for rfc1002 length field and 1 for pad */
 957         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 958
 959         /* Testing shows that buffer offset must be at location of Buffer[0] */
 960         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 961                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 962         req->PathLength = cpu_to_le16(unc_path_len - 2);
 963         iov[1].iov_base = unc_path;
 964         iov[1].iov_len = unc_path_len;
 965
 966         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 967
 968         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 969         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 970
 971         if (rc != 0) {
 972                 if (tcon) {
 973                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 974                         tcon->need_reconnect = true;
 975                 }
 976                 goto tcon_error_exit;
 977         }
 978
 979         if (tcon == NULL) {
 980                 ses->ipc_tid = rsp->hdr.TreeId;
 981                 goto tcon_exit;
 982         }
 983
 984         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 985                 cifs_dbg(FYI, "connection to disk share\n");
 986         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 987                 tcon->ipc = true;
 988                 cifs_dbg(FYI, "connection to pipe share\n");
 989         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 990                 tcon->print = true;
 991                 cifs_dbg(FYI, "connection to printer\n");
 992         } else {
 993                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 994                 rc = -EOPNOTSUPP;
 995                 goto tcon_error_exit;
 996         }
 997
 998         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 999         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1000         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1001         tcon->tidStatus = CifsGood;
1002         tcon->need_reconnect = false;
1003         tcon->tid = rsp->hdr.TreeId;
1004         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1005
1006         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1007             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1008                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1009         init_copy_chunk_defaults(tcon);
1010         if (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA)
1011                 cifs_dbg(VFS, "Encrypted shares not supported");
1012         if (tcon->ses->server->ops->validate_negotiate)
1013                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1014 tcon_exit:
1015         free_rsp_buf(resp_buftype, rsp);
1016         kfree(unc_path);
1017         return rc;
1018
1019 tcon_error_exit:
1020         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
1021                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1022                 if (tcon)
1023                         tcon->bad_network_name = true;
1024         }
1025         goto tcon_exit;
1026 }
1027
1028 int
1029 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1030 {
1031         struct smb2_tree_disconnect_req *req; /* response is trivial */
1032         int rc = 0;
1033         struct TCP_Server_Info *server;
1034         struct cifs_ses *ses = tcon->ses;
1035
1036         cifs_dbg(FYI, "Tree Disconnect\n");
1037
1038         if (ses && (ses->server))
1039                 server = ses->server;
1040         else
1041                 return -EIO;
1042
1043         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1044                 return 0;
1045
1046         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
1047         if (rc)
1048                 return rc;
1049
1050         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
1051         if (rc)
1052                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1053
1054         return rc;
1055 }
1056
1057
1058 static struct create_durable *
1059 create_durable_buf(void)
1060 {
1061         struct create_durable *buf;
1062
1063         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1064         if (!buf)
1065                 return NULL;
1066
1067         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1068                                         (struct create_durable, Data));
1069         buf->ccontext.DataLength = cpu_to_le32(16);
1070         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1071                                 (struct create_durable, Name));
1072         buf->ccontext.NameLength = cpu_to_le16(4);
1073         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1074         buf->Name[0] = 'D';
1075         buf->Name[1] = 'H';
1076         buf->Name[2] = 'n';
1077         buf->Name[3] = 'Q';
1078         return buf;
1079 }
1080
1081 static struct create_durable *
1082 create_reconnect_durable_buf(struct cifs_fid *fid)
1083 {
1084         struct create_durable *buf;
1085
1086         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1087         if (!buf)
1088                 return NULL;
1089
1090         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1091                                         (struct create_durable, Data));
1092         buf->ccontext.DataLength = cpu_to_le32(16);
1093         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1094                                 (struct create_durable, Name));
1095         buf->ccontext.NameLength = cpu_to_le16(4);
1096         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1097         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1098         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1099         buf->Name[0] = 'D';
1100         buf->Name[1] = 'H';
1101         buf->Name[2] = 'n';
1102         buf->Name[3] = 'C';
1103         return buf;
1104 }
1105
1106 static __u8
1107 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1108                   unsigned int *epoch)
1109 {
1110         char *data_offset;
1111         struct create_context *cc;
1112         unsigned int next = 0;
1113         char *name;
1114
1115         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1116         cc = (struct create_context *)data_offset;
1117         do {
1118                 cc = (struct create_context *)((char *)cc + next);
1119                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1120                 if (le16_to_cpu(cc->NameLength) != 4 ||
1121                     strncmp(name, "RqLs", 4)) {
1122                         next = le32_to_cpu(cc->Next);
1123                         continue;
1124                 }
1125                 return server->ops->parse_lease_buf(cc, epoch);
1126         } while (next != 0);
1127
1128         return 0;
1129 }
1130
1131 static int
1132 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1133                   unsigned int *num_iovec, __u8 *oplock)
1134 {
1135         struct smb2_create_req *req = iov[0].iov_base;
1136         unsigned int num = *num_iovec;
1137
1138         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1139         if (iov[num].iov_base == NULL)
1140                 return -ENOMEM;
1141         iov[num].iov_len = server->vals->create_lease_size;
1142         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1143         if (!req->CreateContextsOffset)
1144                 req->CreateContextsOffset = cpu_to_le32(
1145                                 sizeof(struct smb2_create_req) - 4 +
1146                                 iov[num - 1].iov_len);
1147         le32_add_cpu(&req->CreateContextsLength,
1148                      server->vals->create_lease_size);
1149         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1150         *num_iovec = num + 1;
1151         return 0;
1152 }
1153
1154 static struct create_durable_v2 *
1155 create_durable_v2_buf(struct cifs_fid *pfid)
1156 {
1157         struct create_durable_v2 *buf;
1158
1159         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1160         if (!buf)
1161                 return NULL;
1162
1163         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1164                                         (struct create_durable_v2, dcontext));
1165         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1166         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1167                                 (struct create_durable_v2, Name));
1168         buf->ccontext.NameLength = cpu_to_le16(4);
1169
1170         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1171         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1172         get_random_bytes(buf->dcontext.CreateGuid, 16);
1173         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1174
1175         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1176         buf->Name[0] = 'D';
1177         buf->Name[1] = 'H';
1178         buf->Name[2] = '2';
1179         buf->Name[3] = 'Q';
1180         return buf;
1181 }
1182
1183 static struct create_durable_handle_reconnect_v2 *
1184 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1185 {
1186         struct create_durable_handle_reconnect_v2 *buf;
1187
1188         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1189                         GFP_KERNEL);
1190         if (!buf)
1191                 return NULL;
1192
1193         buf->ccontext.DataOffset =
1194                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1195                                      dcontext));
1196         buf->ccontext.DataLength =
1197                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1198         buf->ccontext.NameOffset =
1199                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1200                             Name));
1201         buf->ccontext.NameLength = cpu_to_le16(4);
1202
1203         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1204         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1205         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1206         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1207
1208         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1209         buf->Name[0] = 'D';
1210         buf->Name[1] = 'H';
1211         buf->Name[2] = '2';
1212         buf->Name[3] = 'C';
1213         return buf;
1214 }
1215
1216 static int
1217 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1218                     struct cifs_open_parms *oparms)
1219 {
1220         struct smb2_create_req *req = iov[0].iov_base;
1221         unsigned int num = *num_iovec;
1222
1223         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1224         if (iov[num].iov_base == NULL)
1225                 return -ENOMEM;
1226         iov[num].iov_len = sizeof(struct create_durable_v2);
1227         if (!req->CreateContextsOffset)
1228                 req->CreateContextsOffset =
1229                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1230                                                                 iov[1].iov_len);
1231         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1232         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable_v2));
1233         *num_iovec = num + 1;
1234         return 0;
1235 }
1236
1237 static int
1238 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1239                     struct cifs_open_parms *oparms)
1240 {
1241         struct smb2_create_req *req = iov[0].iov_base;
1242         unsigned int num = *num_iovec;
1243
1244         /* indicate that we don't need to relock the file */
1245         oparms->reconnect = false;
1246
1247         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1248         if (iov[num].iov_base == NULL)
1249                 return -ENOMEM;
1250         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1251         if (!req->CreateContextsOffset)
1252                 req->CreateContextsOffset =
1253                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1254                                                                 iov[1].iov_len);
1255         le32_add_cpu(&req->CreateContextsLength,
1256                         sizeof(struct create_durable_handle_reconnect_v2));
1257         inc_rfc1001_len(&req->hdr,
1258                         sizeof(struct create_durable_handle_reconnect_v2));
1259         *num_iovec = num + 1;
1260         return 0;
1261 }
1262
1263 static int
1264 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1265                     struct cifs_open_parms *oparms, bool use_persistent)
1266 {
1267         struct smb2_create_req *req = iov[0].iov_base;
1268         unsigned int num = *num_iovec;
1269
1270         if (use_persistent) {
1271                 if (oparms->reconnect)
1272                         return add_durable_reconnect_v2_context(iov, num_iovec,
1273                                                                 oparms);
1274                 else
1275                         return add_durable_v2_context(iov, num_iovec, oparms);
1276         }
1277
1278         if (oparms->reconnect) {
1279                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1280                 /* indicate that we don't need to relock the file */
1281                 oparms->reconnect = false;
1282         } else
1283                 iov[num].iov_base = create_durable_buf();
1284         if (iov[num].iov_base == NULL)
1285                 return -ENOMEM;
1286         iov[num].iov_len = sizeof(struct create_durable);
1287         if (!req->CreateContextsOffset)
1288                 req->CreateContextsOffset =
1289                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1290                                                                 iov[1].iov_len);
1291         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1292         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1293         *num_iovec = num + 1;
1294         return 0;
1295 }
1296
1297 int
1298 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1299           __u8 *oplock, struct smb2_file_all_info *buf,
1300           struct smb2_err_rsp **err_buf)
1301 {
1302         struct smb2_create_req *req;
1303         struct smb2_create_rsp *rsp;
1304         struct TCP_Server_Info *server;
1305         struct cifs_tcon *tcon = oparms->tcon;
1306         struct cifs_ses *ses = tcon->ses;
1307         struct kvec iov[4];
1308         int resp_buftype;
1309         int uni_path_len;
1310         __le16 *copy_path = NULL;
1311         int copy_size;
1312         int rc = 0;
1313         unsigned int num_iovecs = 2;
1314         __u32 file_attributes = 0;
1315         char *dhc_buf = NULL, *lc_buf = NULL;
1316
1317         cifs_dbg(FYI, "create/open\n");
1318
1319         if (ses && (ses->server))
1320                 server = ses->server;
1321         else
1322                 return -EIO;
1323
1324         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1325         if (rc)
1326                 return rc;
1327
1328         if (oparms->create_options & CREATE_OPTION_READONLY)
1329                 file_attributes |= ATTR_READONLY;
1330         if (oparms->create_options & CREATE_OPTION_SPECIAL)
1331                 file_attributes |= ATTR_SYSTEM;
1332
1333         req->ImpersonationLevel = IL_IMPERSONATION;
1334         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1335         /* File attributes ignored on open (used in create though) */
1336         req->FileAttributes = cpu_to_le32(file_attributes);
1337         req->ShareAccess = FILE_SHARE_ALL_LE;
1338         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1339         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1340         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1341         /* do not count rfc1001 len field */
1342         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1343
1344         iov[0].iov_base = (char *)req;
1345         /* 4 for rfc1002 length field */
1346         iov[0].iov_len = get_rfc1002_length(req) + 4;
1347
1348         /* MUST set path len (NameLength) to 0 opening root of share */
1349         req->NameLength = cpu_to_le16(uni_path_len - 2);
1350         /* -1 since last byte is buf[0] which is sent below (path) */
1351         iov[0].iov_len--;
1352         if (uni_path_len % 8 != 0) {
1353                 copy_size = uni_path_len / 8 * 8;
1354                 if (copy_size < uni_path_len)
1355                         copy_size += 8;
1356
1357                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1358                 if (!copy_path)
1359                         return -ENOMEM;
1360                 memcpy((char *)copy_path, (const char *)path,
1361                         uni_path_len);
1362                 uni_path_len = copy_size;
1363                 path = copy_path;
1364         }
1365
1366         iov[1].iov_len = uni_path_len;
1367         iov[1].iov_base = path;
1368         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1369         inc_rfc1001_len(req, uni_path_len - 1);
1370
1371         if (!server->oplocks)
1372                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1373
1374         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1375             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1376                 req->RequestedOplockLevel = *oplock;
1377         else {
1378                 rc = add_lease_context(server, iov, &num_iovecs, oplock);
1379                 if (rc) {
1380                         cifs_small_buf_release(req);
1381                         kfree(copy_path);
1382                         return rc;
1383                 }
1384                 lc_buf = iov[num_iovecs-1].iov_base;
1385         }
1386
1387         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1388                 /* need to set Next field of lease context if we request it */
1389                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1390                         struct create_context *ccontext =
1391                             (struct create_context *)iov[num_iovecs-1].iov_base;
1392                         ccontext->Next =
1393                                 cpu_to_le32(server->vals->create_lease_size);
1394                 }
1395
1396                 rc = add_durable_context(iov, &num_iovecs, oparms,
1397                                         tcon->use_persistent);
1398                 if (rc) {
1399                         cifs_small_buf_release(req);
1400                         kfree(copy_path);
1401                         kfree(lc_buf);
1402                         return rc;
1403                 }
1404                 dhc_buf = iov[num_iovecs-1].iov_base;
1405         }
1406
1407         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1408         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1409
1410         if (rc != 0) {
1411                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1412                 if (err_buf)
1413                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1414                                            GFP_KERNEL);
1415                 goto creat_exit;
1416         }
1417
1418         oparms->fid->persistent_fid = rsp->PersistentFileId;
1419         oparms->fid->volatile_fid = rsp->VolatileFileId;
1420
1421         if (buf) {
1422                 memcpy(buf, &rsp->CreationTime, 32);
1423                 buf->AllocationSize = rsp->AllocationSize;
1424                 buf->EndOfFile = rsp->EndofFile;
1425                 buf->Attributes = rsp->FileAttributes;
1426                 buf->NumberOfLinks = cpu_to_le32(1);
1427                 buf->DeletePending = 0;
1428         }
1429
1430         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1431                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1432         else
1433                 *oplock = rsp->OplockLevel;
1434 creat_exit:
1435         kfree(copy_path);
1436         kfree(lc_buf);
1437         kfree(dhc_buf);
1438         free_rsp_buf(resp_buftype, rsp);
1439         return rc;
1440 }
1441
1442 /*
1443  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1444  */
1445 int
1446 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1447            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1448            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1449 {
1450         struct smb2_ioctl_req *req;
1451         struct smb2_ioctl_rsp *rsp;
1452         struct TCP_Server_Info *server;
1453         struct cifs_ses *ses;
1454         struct kvec iov[2];
1455         int resp_buftype;
1456         int num_iovecs;
1457         int rc = 0;
1458
1459         cifs_dbg(FYI, "SMB2 IOCTL\n");
1460
1461         if (out_data != NULL)
1462                 *out_data = NULL;
1463
1464         /* zero out returned data len, in case of error */
1465         if (plen)
1466                 *plen = 0;
1467
1468         if (tcon)
1469                 ses = tcon->ses;
1470         else
1471                 return -EIO;
1472
1473         if (ses && (ses->server))
1474                 server = ses->server;
1475         else
1476                 return -EIO;
1477
1478         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1479         if (rc)
1480                 return rc;
1481
1482         req->CtlCode = cpu_to_le32(opcode);
1483         req->PersistentFileId = persistent_fid;
1484         req->VolatileFileId = volatile_fid;
1485
1486         if (indatalen) {
1487                 req->InputCount = cpu_to_le32(indatalen);
1488                 /* do not set InputOffset if no input data */
1489                 req->InputOffset =
1490                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1491                 iov[1].iov_base = in_data;
1492                 iov[1].iov_len = indatalen;
1493                 num_iovecs = 2;
1494         } else
1495                 num_iovecs = 1;
1496
1497         req->OutputOffset = 0;
1498         req->OutputCount = 0; /* MBZ */
1499
1500         /*
1501          * Could increase MaxOutputResponse, but that would require more
1502          * than one credit. Windows typically sets this smaller, but for some
1503          * ioctls it may be useful to allow server to send more. No point
1504          * limiting what the server can send as long as fits in one credit
1505          */
1506         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1507
1508         if (is_fsctl)
1509                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1510         else
1511                 req->Flags = 0;
1512
1513         iov[0].iov_base = (char *)req;
1514
1515         /*
1516          * If no input data, the size of ioctl struct in
1517          * protocol spec still includes a 1 byte data buffer,
1518          * but if input data passed to ioctl, we do not
1519          * want to double count this, so we do not send
1520          * the dummy one byte of data in iovec[0] if sending
1521          * input data (in iovec[1]). We also must add 4 bytes
1522          * in first iovec to allow for rfc1002 length field.
1523          */
1524
1525         if (indatalen) {
1526                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1527                 inc_rfc1001_len(req, indatalen - 1);
1528         } else
1529                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1530
1531
1532         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1533         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1534
1535         if ((rc != 0) && (rc != -EINVAL)) {
1536                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1537                 goto ioctl_exit;
1538         } else if (rc == -EINVAL) {
1539                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1540                     (opcode != FSCTL_SRV_COPYCHUNK)) {
1541                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1542                         goto ioctl_exit;
1543                 }
1544         }
1545
1546         /* check if caller wants to look at return data or just return rc */
1547         if ((plen == NULL) || (out_data == NULL))
1548                 goto ioctl_exit;
1549
1550         *plen = le32_to_cpu(rsp->OutputCount);
1551
1552         /* We check for obvious errors in the output buffer length and offset */
1553         if (*plen == 0)
1554                 goto ioctl_exit; /* server returned no data */
1555         else if (*plen > 0xFF00) {
1556                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1557                 *plen = 0;
1558                 rc = -EIO;
1559                 goto ioctl_exit;
1560         }
1561
1562         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1563                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1564                         le32_to_cpu(rsp->OutputOffset));
1565                 *plen = 0;
1566                 rc = -EIO;
1567                 goto ioctl_exit;
1568         }
1569
1570         *out_data = kmalloc(*plen, GFP_KERNEL);
1571         if (*out_data == NULL) {
1572                 rc = -ENOMEM;
1573                 goto ioctl_exit;
1574         }
1575
1576         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1577                *plen);
1578 ioctl_exit:
1579         free_rsp_buf(resp_buftype, rsp);
1580         return rc;
1581 }
1582
1583 /*
1584  *   Individual callers to ioctl worker function follow
1585  */
1586
1587 int
1588 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1589                      u64 persistent_fid, u64 volatile_fid)
1590 {
1591         int rc;
1592         struct  compress_ioctl fsctl_input;
1593         char *ret_data = NULL;
1594
1595         fsctl_input.CompressionState =
1596                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1597
1598         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1599                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1600                         (char *)&fsctl_input /* data input */,
1601                         2 /* in data len */, &ret_data /* out data */, NULL);
1602
1603         cifs_dbg(FYI, "set compression rc %d\n", rc);
1604
1605         return rc;
1606 }
1607
1608 int
1609 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1610            u64 persistent_fid, u64 volatile_fid)
1611 {
1612         struct smb2_close_req *req;
1613         struct smb2_close_rsp *rsp;
1614         struct TCP_Server_Info *server;
1615         struct cifs_ses *ses = tcon->ses;
1616         struct kvec iov[1];
1617         int resp_buftype;
1618         int rc = 0;
1619
1620         cifs_dbg(FYI, "Close\n");
1621
1622         if (ses && (ses->server))
1623                 server = ses->server;
1624         else
1625                 return -EIO;
1626
1627         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1628         if (rc)
1629                 return rc;
1630
1631         req->PersistentFileId = persistent_fid;
1632         req->VolatileFileId = volatile_fid;
1633
1634         iov[0].iov_base = (char *)req;
1635         /* 4 for rfc1002 length field */
1636         iov[0].iov_len = get_rfc1002_length(req) + 4;
1637
1638         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1639         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1640
1641         if (rc != 0) {
1642                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1643                 goto close_exit;
1644         }
1645
1646         /* BB FIXME - decode close response, update inode for caching */
1647
1648 close_exit:
1649         free_rsp_buf(resp_buftype, rsp);
1650         return rc;
1651 }
1652
1653 static int
1654 validate_buf(unsigned int offset, unsigned int buffer_length,
1655              struct smb2_hdr *hdr, unsigned int min_buf_size)
1656
1657 {
1658         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1659         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1660         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1661         char *end_of_buf = begin_of_buf + buffer_length;
1662
1663
1664         if (buffer_length < min_buf_size) {
1665                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1666                          buffer_length, min_buf_size);
1667                 return -EINVAL;
1668         }
1669
1670         /* check if beyond RFC1001 maximum length */
1671         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1672                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1673                          buffer_length, smb_len);
1674                 return -EINVAL;
1675         }
1676
1677         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1678                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1679                 return -EINVAL;
1680         }
1681
1682         return 0;
1683 }
1684
1685 /*
1686  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1687  * Caller must free buffer.
1688  */
1689 static int
1690 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1691                       struct smb2_hdr *hdr, unsigned int minbufsize,
1692                       char *data)
1693
1694 {
1695         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1696         int rc;
1697
1698         if (!data)
1699                 return -EINVAL;
1700
1701         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1702         if (rc)
1703                 return rc;
1704
1705         memcpy(data, begin_of_buf, buffer_length);
1706
1707         return 0;
1708 }
1709
1710 static int
1711 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1712            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1713            size_t output_len, size_t min_len, void *data)
1714 {
1715         struct smb2_query_info_req *req;
1716         struct smb2_query_info_rsp *rsp = NULL;
1717         struct kvec iov[2];
1718         int rc = 0;
1719         int resp_buftype;
1720         struct TCP_Server_Info *server;
1721         struct cifs_ses *ses = tcon->ses;
1722
1723         cifs_dbg(FYI, "Query Info\n");
1724
1725         if (ses && (ses->server))
1726                 server = ses->server;
1727         else
1728                 return -EIO;
1729
1730         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1731         if (rc)
1732                 return rc;
1733
1734         req->InfoType = SMB2_O_INFO_FILE;
1735         req->FileInfoClass = info_class;
1736         req->PersistentFileId = persistent_fid;
1737         req->VolatileFileId = volatile_fid;
1738         /* 4 for rfc1002 length field and 1 for Buffer */
1739         req->InputBufferOffset =
1740                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1741         req->OutputBufferLength = cpu_to_le32(output_len);
1742
1743         iov[0].iov_base = (char *)req;
1744         /* 4 for rfc1002 length field */
1745         iov[0].iov_len = get_rfc1002_length(req) + 4;
1746
1747         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1748         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1749
1750         if (rc) {
1751                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1752                 goto qinf_exit;
1753         }
1754
1755         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1756                                    le32_to_cpu(rsp->OutputBufferLength),
1757                                    &rsp->hdr, min_len, data);
1758
1759 qinf_exit:
1760         free_rsp_buf(resp_buftype, rsp);
1761         return rc;
1762 }
1763
1764 int
1765 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1766                 u64 persistent_fid, u64 volatile_fid,
1767                 struct smb2_file_all_info *data)
1768 {
1769         return query_info(xid, tcon, persistent_fid, volatile_fid,
1770                           FILE_ALL_INFORMATION,
1771                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
1772                           sizeof(struct smb2_file_all_info), data);
1773 }
1774
1775 int
1776 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1777                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1778 {
1779         return query_info(xid, tcon, persistent_fid, volatile_fid,
1780                           FILE_INTERNAL_INFORMATION,
1781                           sizeof(struct smb2_file_internal_info),
1782                           sizeof(struct smb2_file_internal_info), uniqueid);
1783 }
1784
1785 /*
1786  * This is a no-op for now. We're not really interested in the reply, but
1787  * rather in the fact that the server sent one and that server->lstrp
1788  * gets updated.
1789  *
1790  * FIXME: maybe we should consider checking that the reply matches request?
1791  */
1792 static void
1793 smb2_echo_callback(struct mid_q_entry *mid)
1794 {
1795         struct TCP_Server_Info *server = mid->callback_data;
1796         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1797         unsigned int credits_received = 1;
1798
1799         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1800                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1801
1802         mutex_lock(&server->srv_mutex);
1803         DeleteMidQEntry(mid);
1804         mutex_unlock(&server->srv_mutex);
1805         add_credits(server, credits_received, CIFS_ECHO_OP);
1806 }
1807
1808 int
1809 SMB2_echo(struct TCP_Server_Info *server)
1810 {
1811         struct smb2_echo_req *req;
1812         int rc = 0;
1813         struct kvec iov;
1814         struct smb_rqst rqst = { .rq_iov = &iov,
1815                                  .rq_nvec = 1 };
1816
1817         cifs_dbg(FYI, "In echo request\n");
1818
1819         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1820         if (rc)
1821                 return rc;
1822
1823         req->hdr.CreditRequest = cpu_to_le16(1);
1824
1825         iov.iov_base = (char *)req;
1826         /* 4 for rfc1002 length field */
1827         iov.iov_len = get_rfc1002_length(req) + 4;
1828
1829         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1830                              CIFS_ECHO_OP);
1831         if (rc)
1832                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1833
1834         cifs_small_buf_release(req);
1835         return rc;
1836 }
1837
1838 int
1839 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1840            u64 volatile_fid)
1841 {
1842         struct smb2_flush_req *req;
1843         struct TCP_Server_Info *server;
1844         struct cifs_ses *ses = tcon->ses;
1845         struct kvec iov[1];
1846         int resp_buftype;
1847         int rc = 0;
1848
1849         cifs_dbg(FYI, "Flush\n");
1850
1851         if (ses && (ses->server))
1852                 server = ses->server;
1853         else
1854                 return -EIO;
1855
1856         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1857         if (rc)
1858                 return rc;
1859
1860         req->PersistentFileId = persistent_fid;
1861         req->VolatileFileId = volatile_fid;
1862
1863         iov[0].iov_base = (char *)req;
1864         /* 4 for rfc1002 length field */
1865         iov[0].iov_len = get_rfc1002_length(req) + 4;
1866
1867         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1868
1869         if (rc != 0)
1870                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1871
1872         free_rsp_buf(resp_buftype, iov[0].iov_base);
1873         return rc;
1874 }
1875
1876 /*
1877  * To form a chain of read requests, any read requests after the first should
1878  * have the end_of_chain boolean set to true.
1879  */
1880 static int
1881 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1882                   unsigned int remaining_bytes, int request_type)
1883 {
1884         int rc = -EACCES;
1885         struct smb2_read_req *req = NULL;
1886
1887         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1888         if (rc)
1889                 return rc;
1890         if (io_parms->tcon->ses->server == NULL)
1891                 return -ECONNABORTED;
1892
1893         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1894
1895         req->PersistentFileId = io_parms->persistent_fid;
1896         req->VolatileFileId = io_parms->volatile_fid;
1897         req->ReadChannelInfoOffset = 0; /* reserved */
1898         req->ReadChannelInfoLength = 0; /* reserved */
1899         req->Channel = 0; /* reserved */
1900         req->MinimumCount = 0;
1901         req->Length = cpu_to_le32(io_parms->length);
1902         req->Offset = cpu_to_le64(io_parms->offset);
1903
1904         if (request_type & CHAINED_REQUEST) {
1905                 if (!(request_type & END_OF_CHAIN)) {
1906                         /* 4 for rfc1002 length field */
1907                         req->hdr.NextCommand =
1908                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1909                 } else /* END_OF_CHAIN */
1910                         req->hdr.NextCommand = 0;
1911                 if (request_type & RELATED_REQUEST) {
1912                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1913                         /*
1914                          * Related requests use info from previous read request
1915                          * in chain.
1916                          */
1917                         req->hdr.SessionId = 0xFFFFFFFF;
1918                         req->hdr.TreeId = 0xFFFFFFFF;
1919                         req->PersistentFileId = 0xFFFFFFFF;
1920                         req->VolatileFileId = 0xFFFFFFFF;
1921                 }
1922         }
1923         if (remaining_bytes > io_parms->length)
1924                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1925         else
1926                 req->RemainingBytes = 0;
1927
1928         iov[0].iov_base = (char *)req;
1929         /* 4 for rfc1002 length field */
1930         iov[0].iov_len = get_rfc1002_length(req) + 4;
1931         return rc;
1932 }
1933
1934 static void
1935 smb2_readv_callback(struct mid_q_entry *mid)
1936 {
1937         struct cifs_readdata *rdata = mid->callback_data;
1938         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1939         struct TCP_Server_Info *server = tcon->ses->server;
1940         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1941         unsigned int credits_received = 1;
1942         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1943                                  .rq_nvec = 1,
1944                                  .rq_pages = rdata->pages,
1945                                  .rq_npages = rdata->nr_pages,
1946                                  .rq_pagesz = rdata->pagesz,
1947                                  .rq_tailsz = rdata->tailsz };
1948
1949         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1950                  __func__, mid->mid, mid->mid_state, rdata->result,
1951                  rdata->bytes);
1952
1953         switch (mid->mid_state) {
1954         case MID_RESPONSE_RECEIVED:
1955                 credits_received = le16_to_cpu(buf->CreditRequest);
1956                 /* result already set, check signature */
1957                 if (server->sign) {
1958                         int rc;
1959
1960                         rc = smb2_verify_signature(&rqst, server);
1961                         if (rc)
1962                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1963                                          rc);
1964                 }
1965                 /* FIXME: should this be counted toward the initiating task? */
1966                 task_io_account_read(rdata->got_bytes);
1967                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
1968                 break;
1969         case MID_REQUEST_SUBMITTED:
1970         case MID_RETRY_NEEDED:
1971                 rdata->result = -EAGAIN;
1972                 if (server->sign && rdata->got_bytes)
1973                         /* reset bytes number since we can not check a sign */
1974                         rdata->got_bytes = 0;
1975                 /* FIXME: should this be counted toward the initiating task? */
1976                 task_io_account_read(rdata->got_bytes);
1977                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
1978                 break;
1979         default:
1980                 if (rdata->result != -ENODATA)
1981                         rdata->result = -EIO;
1982         }
1983
1984         if (rdata->result)
1985                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1986
1987         queue_work(cifsiod_wq, &rdata->work);
1988         mutex_lock(&server->srv_mutex);
1989         DeleteMidQEntry(mid);
1990         mutex_unlock(&server->srv_mutex);
1991         add_credits(server, credits_received, 0);
1992 }
1993
1994 /* smb2_async_readv - send an async write, and set up mid to handle result */
1995 int
1996 smb2_async_readv(struct cifs_readdata *rdata)
1997 {
1998         int rc, flags = 0;
1999         struct smb2_hdr *buf;
2000         struct cifs_io_parms io_parms;
2001         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
2002                                  .rq_nvec = 1 };
2003         struct TCP_Server_Info *server;
2004
2005         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
2006                  __func__, rdata->offset, rdata->bytes);
2007
2008         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
2009         io_parms.offset = rdata->offset;
2010         io_parms.length = rdata->bytes;
2011         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
2012         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
2013         io_parms.pid = rdata->pid;
2014
2015         server = io_parms.tcon->ses->server;
2016
2017         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
2018         if (rc) {
2019                 if (rc == -EAGAIN && rdata->credits) {
2020                         /* credits was reset by reconnect */
2021                         rdata->credits = 0;
2022                         /* reduce in_flight value since we won't send the req */
2023                         spin_lock(&server->req_lock);
2024                         server->in_flight--;
2025                         spin_unlock(&server->req_lock);
2026                 }
2027                 return rc;
2028         }
2029
2030         buf = (struct smb2_hdr *)rdata->iov.iov_base;
2031         /* 4 for rfc1002 length field */
2032         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
2033
2034         if (rdata->credits) {
2035                 buf->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2036                                                 SMB2_MAX_BUFFER_SIZE));
2037                 spin_lock(&server->req_lock);
2038                 server->credits += rdata->credits -
2039                                                 le16_to_cpu(buf->CreditCharge);
2040                 spin_unlock(&server->req_lock);
2041                 wake_up(&server->request_q);
2042                 flags = CIFS_HAS_CREDITS;
2043         }
2044
2045         kref_get(&rdata->refcount);
2046         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2047                              cifs_readv_receive, smb2_readv_callback,
2048                              rdata, flags);
2049         if (rc) {
2050                 kref_put(&rdata->refcount, cifs_readdata_release);
2051                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
2052         }
2053
2054         cifs_small_buf_release(buf);
2055         return rc;
2056 }
2057
2058 int
2059 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
2060           unsigned int *nbytes, char **buf, int *buf_type)
2061 {
2062         int resp_buftype, rc = -EACCES;
2063         struct smb2_read_rsp *rsp = NULL;
2064         struct kvec iov[1];
2065
2066         *nbytes = 0;
2067         rc = smb2_new_read_req(iov, io_parms, 0, 0);
2068         if (rc)
2069                 return rc;
2070
2071         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
2072                           &resp_buftype, CIFS_LOG_ERROR);
2073
2074         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
2075
2076         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
2077                 free_rsp_buf(resp_buftype, iov[0].iov_base);
2078                 return 0;
2079         }
2080
2081         if (rc) {
2082                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2083                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
2084         } else {
2085                 *nbytes = le32_to_cpu(rsp->DataLength);
2086                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
2087                     (*nbytes > io_parms->length)) {
2088                         cifs_dbg(FYI, "bad length %d for count %d\n",
2089                                  *nbytes, io_parms->length);
2090                         rc = -EIO;
2091                         *nbytes = 0;
2092                 }
2093         }
2094
2095         if (*buf) {
2096                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
2097                        *nbytes);
2098                 free_rsp_buf(resp_buftype, iov[0].iov_base);
2099         } else if (resp_buftype != CIFS_NO_BUFFER) {
2100                 *buf = iov[0].iov_base;
2101                 if (resp_buftype == CIFS_SMALL_BUFFER)
2102                         *buf_type = CIFS_SMALL_BUFFER;
2103                 else if (resp_buftype == CIFS_LARGE_BUFFER)
2104                         *buf_type = CIFS_LARGE_BUFFER;
2105         }
2106         return rc;
2107 }
2108
2109 /*
2110  * Check the mid_state and signature on received buffer (if any), and queue the
2111  * workqueue completion task.
2112  */
2113 static void
2114 smb2_writev_callback(struct mid_q_entry *mid)
2115 {
2116         struct cifs_writedata *wdata = mid->callback_data;
2117         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2118         struct TCP_Server_Info *server = tcon->ses->server;
2119         unsigned int written;
2120         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
2121         unsigned int credits_received = 1;
2122
2123         switch (mid->mid_state) {
2124         case MID_RESPONSE_RECEIVED:
2125                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
2126                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
2127                 if (wdata->result != 0)
2128                         break;
2129
2130                 written = le32_to_cpu(rsp->DataLength);
2131                 /*
2132                  * Mask off high 16 bits when bytes written as returned
2133                  * by the server is greater than bytes requested by the
2134                  * client. OS/2 servers are known to set incorrect
2135                  * CountHigh values.
2136                  */
2137                 if (written > wdata->bytes)
2138                         written &= 0xFFFF;
2139
2140                 if (written < wdata->bytes)
2141                         wdata->result = -ENOSPC;
2142                 else
2143                         wdata->bytes = written;
2144                 break;
2145         case MID_REQUEST_SUBMITTED:
2146         case MID_RETRY_NEEDED:
2147                 wdata->result = -EAGAIN;
2148                 break;
2149         default:
2150                 wdata->result = -EIO;
2151                 break;
2152         }
2153
2154         if (wdata->result)
2155                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2156
2157         queue_work(cifsiod_wq, &wdata->work);
2158         mutex_lock(&server->srv_mutex);
2159         DeleteMidQEntry(mid);
2160         mutex_unlock(&server->srv_mutex);
2161         add_credits(tcon->ses->server, credits_received, 0);
2162 }
2163
2164 /* smb2_async_writev - send an async write, and set up mid to handle result */
2165 int
2166 smb2_async_writev(struct cifs_writedata *wdata,
2167                   void (*release)(struct kref *kref))
2168 {
2169         int rc = -EACCES, flags = 0;
2170         struct smb2_write_req *req = NULL;
2171         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2172         struct TCP_Server_Info *server = tcon->ses->server;
2173         struct kvec iov;
2174         struct smb_rqst rqst;
2175
2176         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
2177         if (rc) {
2178                 if (rc == -EAGAIN && wdata->credits) {
2179                         /* credits was reset by reconnect */
2180                         wdata->credits = 0;
2181                         /* reduce in_flight value since we won't send the req */
2182                         spin_lock(&server->req_lock);
2183                         server->in_flight--;
2184                         spin_unlock(&server->req_lock);
2185                 }
2186                 goto async_writev_out;
2187         }
2188
2189         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
2190
2191         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
2192         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
2193         req->WriteChannelInfoOffset = 0;
2194         req->WriteChannelInfoLength = 0;
2195         req->Channel = 0;
2196         req->Offset = cpu_to_le64(wdata->offset);
2197         /* 4 for rfc1002 length field */
2198         req->DataOffset = cpu_to_le16(
2199                                 offsetof(struct smb2_write_req, Buffer) - 4);
2200         req->RemainingBytes = 0;
2201
2202         /* 4 for rfc1002 length field and 1 for Buffer */
2203         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
2204         iov.iov_base = req;
2205
2206         rqst.rq_iov = &iov;
2207         rqst.rq_nvec = 1;
2208         rqst.rq_pages = wdata->pages;
2209         rqst.rq_npages = wdata->nr_pages;
2210         rqst.rq_pagesz = wdata->pagesz;
2211         rqst.rq_tailsz = wdata->tailsz;
2212
2213         cifs_dbg(FYI, "async write at %llu %u bytes\n",
2214                  wdata->offset, wdata->bytes);
2215
2216         req->Length = cpu_to_le32(wdata->bytes);
2217
2218         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
2219
2220         if (wdata->credits) {
2221                 req->hdr.CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2222                                                     SMB2_MAX_BUFFER_SIZE));
2223                 spin_lock(&server->req_lock);
2224                 server->credits += wdata->credits -
2225                                         le16_to_cpu(req->hdr.CreditCharge);
2226                 spin_unlock(&server->req_lock);
2227                 wake_up(&server->request_q);
2228                 flags = CIFS_HAS_CREDITS;
2229         }
2230
2231         kref_get(&wdata->refcount);
2232         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, wdata,
2233                              flags);
2234
2235         if (rc) {
2236                 kref_put(&wdata->refcount, release);
2237                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2238         }
2239
2240 async_writev_out:
2241         cifs_small_buf_release(req);
2242         return rc;
2243 }
2244
2245 /*
2246  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
2247  * The length field from io_parms must be at least 1 and indicates a number of
2248  * elements with data to write that begins with position 1 in iov array. All
2249  * data length is specified by count.
2250  */
2251 int
2252 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
2253            unsigned int *nbytes, struct kvec *iov, int n_vec)
2254 {
2255         int rc = 0;
2256         struct smb2_write_req *req = NULL;
2257         struct smb2_write_rsp *rsp = NULL;
2258         int resp_buftype;
2259         *nbytes = 0;
2260
2261         if (n_vec < 1)
2262                 return rc;
2263
2264         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
2265         if (rc)
2266                 return rc;
2267
2268         if (io_parms->tcon->ses->server == NULL)
2269                 return -ECONNABORTED;
2270
2271         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
2272
2273         req->PersistentFileId = io_parms->persistent_fid;
2274         req->VolatileFileId = io_parms->volatile_fid;
2275         req->WriteChannelInfoOffset = 0;
2276         req->WriteChannelInfoLength = 0;
2277         req->Channel = 0;
2278         req->Length = cpu_to_le32(io_parms->length);
2279         req->Offset = cpu_to_le64(io_parms->offset);
2280         /* 4 for rfc1002 length field */
2281         req->DataOffset = cpu_to_le16(
2282                                 offsetof(struct smb2_write_req, Buffer) - 4);
2283         req->RemainingBytes = 0;
2284
2285         iov[0].iov_base = (char *)req;
2286         /* 4 for rfc1002 length field and 1 for Buffer */
2287         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2288
2289         /* length of entire message including data to be written */
2290         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2291
2292         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2293                           &resp_buftype, 0);
2294         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
2295
2296         if (rc) {
2297                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2298                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2299         } else
2300                 *nbytes = le32_to_cpu(rsp->DataLength);
2301
2302         free_rsp_buf(resp_buftype, rsp);
2303         return rc;
2304 }
2305
2306 static unsigned int
2307 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2308 {
2309         int len;
2310         unsigned int entrycount = 0;
2311         unsigned int next_offset = 0;
2312         FILE_DIRECTORY_INFO *entryptr;
2313
2314         if (bufstart == NULL)
2315                 return 0;
2316
2317         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2318
2319         while (1) {
2320                 entryptr = (FILE_DIRECTORY_INFO *)
2321                                         ((char *)entryptr + next_offset);
2322
2323                 if ((char *)entryptr + size > end_of_buf) {
2324                         cifs_dbg(VFS, "malformed search entry would overflow\n");
2325                         break;
2326                 }
2327
2328                 len = le32_to_cpu(entryptr->FileNameLength);
2329                 if ((char *)entryptr + len + size > end_of_buf) {
2330                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2331                                  end_of_buf);
2332                         break;
2333                 }
2334
2335                 *lastentry = (char *)entryptr;
2336                 entrycount++;
2337
2338                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2339                 if (!next_offset)
2340                         break;
2341         }
2342
2343         return entrycount;
2344 }
2345
2346 /*
2347  * Readdir/FindFirst
2348  */
2349 int
2350 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2351                      u64 persistent_fid, u64 volatile_fid, int index,
2352                      struct cifs_search_info *srch_inf)
2353 {
2354         struct smb2_query_directory_req *req;
2355         struct smb2_query_directory_rsp *rsp = NULL;
2356         struct kvec iov[2];
2357         int rc = 0;
2358         int len;
2359         int resp_buftype = CIFS_NO_BUFFER;
2360         unsigned char *bufptr;
2361         struct TCP_Server_Info *server;
2362         struct cifs_ses *ses = tcon->ses;
2363         __le16 asteriks = cpu_to_le16('*');
2364         char *end_of_smb;
2365         unsigned int output_size = CIFSMaxBufSize;
2366         size_t info_buf_size;
2367
2368         if (ses && (ses->server))
2369                 server = ses->server;
2370         else
2371                 return -EIO;
2372
2373         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2374         if (rc)
2375                 return rc;
2376
2377         switch (srch_inf->info_level) {
2378         case SMB_FIND_FILE_DIRECTORY_INFO:
2379                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2380                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2381                 break;
2382         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2383                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2384                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2385                 break;
2386         default:
2387                 cifs_dbg(VFS, "info level %u isn't supported\n",
2388                          srch_inf->info_level);
2389                 rc = -EINVAL;
2390                 goto qdir_exit;
2391         }
2392
2393         req->FileIndex = cpu_to_le32(index);
2394         req->PersistentFileId = persistent_fid;
2395         req->VolatileFileId = volatile_fid;
2396
2397         len = 0x2;
2398         bufptr = req->Buffer;
2399         memcpy(bufptr, &asteriks, len);
2400
2401         req->FileNameOffset =
2402                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2403         req->FileNameLength = cpu_to_le16(len);
2404         /*
2405          * BB could be 30 bytes or so longer if we used SMB2 specific
2406          * buffer lengths, but this is safe and close enough.
2407          */
2408         output_size = min_t(unsigned int, output_size, server->maxBuf);
2409         output_size = min_t(unsigned int, output_size, 2 << 15);
2410         req->OutputBufferLength = cpu_to_le32(output_size);
2411
2412         iov[0].iov_base = (char *)req;
2413         /* 4 for RFC1001 length and 1 for Buffer */
2414         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2415
2416         iov[1].iov_base = (char *)(req->Buffer);
2417         iov[1].iov_len = len;
2418
2419         inc_rfc1001_len(req, len - 1 /* Buffer */);
2420
2421         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2422         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2423
2424         if (rc) {
2425                 if (rc == -ENODATA && rsp->hdr.Status == STATUS_NO_MORE_FILES) {
2426                         srch_inf->endOfSearch = true;
2427                         rc = 0;
2428                 }
2429                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2430                 goto qdir_exit;
2431         }
2432
2433         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2434                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2435                           info_buf_size);
2436         if (rc)
2437                 goto qdir_exit;
2438
2439         srch_inf->unicode = true;
2440
2441         if (srch_inf->ntwrk_buf_start) {
2442                 if (srch_inf->smallBuf)
2443                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2444                 else
2445                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2446         }
2447         srch_inf->ntwrk_buf_start = (char *)rsp;
2448         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2449                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2450         /* 4 for rfc1002 length field */
2451         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2452         srch_inf->entries_in_buffer =
2453                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2454                                     &srch_inf->last_entry, info_buf_size);
2455         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2456         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2457                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2458                  srch_inf->srch_entries_start, srch_inf->last_entry);
2459         if (resp_buftype == CIFS_LARGE_BUFFER)
2460                 srch_inf->smallBuf = false;
2461         else if (resp_buftype == CIFS_SMALL_BUFFER)
2462                 srch_inf->smallBuf = true;
2463         else
2464                 cifs_dbg(VFS, "illegal search buffer type\n");
2465
2466         return rc;
2467
2468 qdir_exit:
2469         free_rsp_buf(resp_buftype, rsp);
2470         return rc;
2471 }
2472
2473 static int
2474 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2475                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2476                unsigned int num, void **data, unsigned int *size)
2477 {
2478         struct smb2_set_info_req *req;
2479         struct smb2_set_info_rsp *rsp = NULL;
2480         struct kvec *iov;
2481         int rc = 0;
2482         int resp_buftype;
2483         unsigned int i;
2484         struct TCP_Server_Info *server;
2485         struct cifs_ses *ses = tcon->ses;
2486
2487         if (ses && (ses->server))
2488                 server = ses->server;
2489         else
2490                 return -EIO;
2491
2492         if (!num)
2493                 return -EINVAL;
2494
2495         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2496         if (!iov)
2497                 return -ENOMEM;
2498
2499         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2500         if (rc) {
2501                 kfree(iov);
2502                 return rc;
2503         }
2504
2505         req->hdr.ProcessId = cpu_to_le32(pid);
2506
2507         req->InfoType = SMB2_O_INFO_FILE;
2508         req->FileInfoClass = info_class;
2509         req->PersistentFileId = persistent_fid;
2510         req->VolatileFileId = volatile_fid;
2511
2512         /* 4 for RFC1001 length and 1 for Buffer */
2513         req->BufferOffset =
2514                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2515         req->BufferLength = cpu_to_le32(*size);
2516
2517         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2518
2519         memcpy(req->Buffer, *data, *size);
2520
2521         iov[0].iov_base = (char *)req;
2522         /* 4 for RFC1001 length */
2523         iov[0].iov_len = get_rfc1002_length(req) + 4;
2524
2525         for (i = 1; i < num; i++) {
2526                 inc_rfc1001_len(req, size[i]);
2527                 le32_add_cpu(&req->BufferLength, size[i]);
2528                 iov[i].iov_base = (char *)data[i];
2529                 iov[i].iov_len = size[i];
2530         }
2531
2532         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2533         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2534
2535         if (rc != 0)
2536                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2537
2538         free_rsp_buf(resp_buftype, rsp);
2539         kfree(iov);
2540         return rc;
2541 }
2542
2543 int
2544 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2545             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2546 {
2547         struct smb2_file_rename_info info;
2548         void **data;
2549         unsigned int size[2];
2550         int rc;
2551         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2552
2553         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2554         if (!data)
2555                 return -ENOMEM;
2556
2557         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2558                               /* 0 = fail if target already exists */
2559         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2560         info.FileNameLength = cpu_to_le32(len);
2561
2562         data[0] = &info;
2563         size[0] = sizeof(struct smb2_file_rename_info);
2564
2565         data[1] = target_file;
2566         size[1] = len + 2 /* null */;
2567
2568         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2569                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2570                            size);
2571         kfree(data);
2572         return rc;
2573 }
2574
2575 int
2576 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2577                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2578 {
2579         struct smb2_file_link_info info;
2580         void **data;
2581         unsigned int size[2];
2582         int rc;
2583         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2584
2585         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2586         if (!data)
2587                 return -ENOMEM;
2588
2589         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2590                               /* 0 = fail if link already exists */
2591         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2592         info.FileNameLength = cpu_to_le32(len);
2593
2594         data[0] = &info;
2595         size[0] = sizeof(struct smb2_file_link_info);
2596
2597         data[1] = target_file;
2598         size[1] = len + 2 /* null */;
2599
2600         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2601                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2602         kfree(data);
2603         return rc;
2604 }
2605
2606 int
2607 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2608              u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
2609 {
2610         struct smb2_file_eof_info info;
2611         void *data;
2612         unsigned int size;
2613
2614         info.EndOfFile = *eof;
2615
2616         data = &info;
2617         size = sizeof(struct smb2_file_eof_info);
2618
2619         if (is_falloc)
2620                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2621                         pid, FILE_ALLOCATION_INFORMATION, 1, &data, &size);
2622         else
2623                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2624                         pid, FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2625 }
2626
2627 int
2628 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2629               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2630 {
2631         unsigned int size;
2632         size = sizeof(FILE_BASIC_INFO);
2633         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2634                              current->tgid, FILE_BASIC_INFORMATION, 1,
2635                              (void **)&buf, &size);
2636 }
2637
2638 int
2639 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2640                   const u64 persistent_fid, const u64 volatile_fid,
2641                   __u8 oplock_level)
2642 {
2643         int rc;
2644         struct smb2_oplock_break *req = NULL;
2645
2646         cifs_dbg(FYI, "SMB2_oplock_break\n");
2647         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2648
2649         if (rc)
2650                 return rc;
2651
2652         req->VolatileFid = volatile_fid;
2653         req->PersistentFid = persistent_fid;
2654         req->OplockLevel = oplock_level;
2655         req->hdr.CreditRequest = cpu_to_le16(1);
2656
2657         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2658         /* SMB2 buffer freed by function above */
2659
2660         if (rc) {
2661                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2662                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2663         }
2664
2665         return rc;
2666 }
2667
2668 static void
2669 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2670                         struct kstatfs *kst)
2671 {
2672         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2673                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2674         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2675         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2676         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2677         return;
2678 }
2679
2680 static int
2681 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2682                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2683 {
2684         int rc;
2685         struct smb2_query_info_req *req;
2686
2687         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2688
2689         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2690                 return -EIO;
2691
2692         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2693         if (rc)
2694                 return rc;
2695
2696         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2697         req->FileInfoClass = level;
2698         req->PersistentFileId = persistent_fid;
2699         req->VolatileFileId = volatile_fid;
2700         /* 4 for rfc1002 length field and 1 for pad */
2701         req->InputBufferOffset =
2702                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2703         req->OutputBufferLength = cpu_to_le32(
2704                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2705
2706         iov->iov_base = (char *)req;
2707         /* 4 for rfc1002 length field */
2708         iov->iov_len = get_rfc1002_length(req) + 4;
2709         return 0;
2710 }
2711
2712 int
2713 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2714               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2715 {
2716         struct smb2_query_info_rsp *rsp = NULL;
2717         struct kvec iov;
2718         int rc = 0;
2719         int resp_buftype;
2720         struct cifs_ses *ses = tcon->ses;
2721         struct smb2_fs_full_size_info *info = NULL;
2722
2723         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2724                                 sizeof(struct smb2_fs_full_size_info),
2725                                 persistent_fid, volatile_fid);
2726         if (rc)
2727                 return rc;
2728
2729         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2730         if (rc) {
2731                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2732                 goto qfsinf_exit;
2733         }
2734         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2735
2736         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2737                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2738         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2739                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2740                           sizeof(struct smb2_fs_full_size_info));
2741         if (!rc)
2742                 copy_fs_info_to_kstatfs(info, fsdata);
2743
2744 qfsinf_exit:
2745         free_rsp_buf(resp_buftype, iov.iov_base);
2746         return rc;
2747 }
2748
2749 int
2750 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
2751               u64 persistent_fid, u64 volatile_fid, int level)
2752 {
2753         struct smb2_query_info_rsp *rsp = NULL;
2754         struct kvec iov;
2755         int rc = 0;
2756         int resp_buftype, max_len, min_len;
2757         struct cifs_ses *ses = tcon->ses;
2758         unsigned int rsp_len, offset;
2759
2760         if (level == FS_DEVICE_INFORMATION) {
2761                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2762                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2763         } else if (level == FS_ATTRIBUTE_INFORMATION) {
2764                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
2765                 min_len = MIN_FS_ATTR_INFO_SIZE;
2766         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
2767                 max_len = sizeof(struct smb3_fs_ss_info);
2768                 min_len = sizeof(struct smb3_fs_ss_info);
2769         } else {
2770                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
2771                 return -EINVAL;
2772         }
2773
2774         rc = build_qfs_info_req(&iov, tcon, level, max_len,
2775                                 persistent_fid, volatile_fid);
2776         if (rc)
2777                 return rc;
2778
2779         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2780         if (rc) {
2781                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2782                 goto qfsattr_exit;
2783         }
2784         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2785
2786         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
2787         offset = le16_to_cpu(rsp->OutputBufferOffset);
2788         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
2789         if (rc)
2790                 goto qfsattr_exit;
2791
2792         if (level == FS_ATTRIBUTE_INFORMATION)
2793                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
2794                         + (char *)&rsp->hdr, min_t(unsigned int,
2795                         rsp_len, max_len));
2796         else if (level == FS_DEVICE_INFORMATION)
2797                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
2798                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
2799         else if (level == FS_SECTOR_SIZE_INFORMATION) {
2800                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
2801                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
2802                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
2803                 tcon->perf_sector_size =
2804                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
2805         }
2806
2807 qfsattr_exit:
2808         free_rsp_buf(resp_buftype, iov.iov_base);
2809         return rc;
2810 }
2811
2812 int
2813 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2814            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2815            const __u32 num_lock, struct smb2_lock_element *buf)
2816 {
2817         int rc = 0;
2818         struct smb2_lock_req *req = NULL;
2819         struct kvec iov[2];
2820         int resp_buf_type;
2821         unsigned int count;
2822
2823         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2824
2825         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2826         if (rc)
2827                 return rc;
2828
2829         req->hdr.ProcessId = cpu_to_le32(pid);
2830         req->LockCount = cpu_to_le16(num_lock);
2831
2832         req->PersistentFileId = persist_fid;
2833         req->VolatileFileId = volatile_fid;
2834
2835         count = num_lock * sizeof(struct smb2_lock_element);
2836         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2837
2838         iov[0].iov_base = (char *)req;
2839         /* 4 for rfc1002 length field and count for all locks */
2840         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2841         iov[1].iov_base = (char *)buf;
2842         iov[1].iov_len = count;
2843
2844         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2845         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2846         if (rc) {
2847                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2848                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2849         }
2850
2851         return rc;
2852 }
2853
2854 int
2855 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2856           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2857           const __u64 length, const __u64 offset, const __u32 lock_flags,
2858           const bool wait)
2859 {
2860         struct smb2_lock_element lock;
2861
2862         lock.Offset = cpu_to_le64(offset);
2863         lock.Length = cpu_to_le64(length);
2864         lock.Flags = cpu_to_le32(lock_flags);
2865         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2866                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2867
2868         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2869 }
2870
2871 int
2872 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2873                  __u8 *lease_key, const __le32 lease_state)
2874 {
2875         int rc;
2876         struct smb2_lease_ack *req = NULL;
2877
2878         cifs_dbg(FYI, "SMB2_lease_break\n");
2879         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2880
2881         if (rc)
2882                 return rc;
2883
2884         req->hdr.CreditRequest = cpu_to_le16(1);
2885         req->StructureSize = cpu_to_le16(36);
2886         inc_rfc1001_len(req, 12);
2887
2888         memcpy(req->LeaseKey, lease_key, 16);
2889         req->LeaseState = lease_state;
2890
2891         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2892         /* SMB2 buffer freed by function above */
2893
2894         if (rc) {
2895                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2896                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2897         }
2898
2899         return rc;
2900 }