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 = SMB2_PROTO_NUMBER;
 101         hdr->StructureSize = cpu_to_le16(64);
 102         hdr->Command = smb2_cmd;
 103         hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
 104         hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 105
 106         if (!tcon)
 107                 goto out;
 108
 109         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 110         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 111         if ((tcon->ses) && (tcon->ses->server) &&
 112             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 113                 hdr->CreditCharge = cpu_to_le16(1);
 114         /* else CreditCharge MBZ */
 115
 116         hdr->TreeId = tcon->tid;
 117         /* Uid is not converted */
 118         if (tcon->ses)
 119                 hdr->SessionId = tcon->ses->Suid;
 120
 121         /*
 122          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 123          * to pass the path on the Open SMB prefixed by \\server\share.
 124          * Not sure when we would need to do the augmented path (if ever) and
 125          * setting this flag breaks the SMB2 open operation since it is
 126          * illegal to send an empty path name (without \\server\share prefix)
 127          * when the DFS flag is set in the SMB open header. We could
 128          * consider setting the flag on all operations other than open
 129          * but it is safer to net set it for now.
 130          */
 131 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 132                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 133
 134         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
 135                 hdr->Flags |= SMB2_FLAGS_SIGNED;
 136 out:
 137         pdu->StructureSize2 = cpu_to_le16(parmsize);
 138         return;
 139 }
 140
 141 static int
 142 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 143 {
 144         int rc = 0;
 145         struct nls_table *nls_codepage;
 146         struct cifs_ses *ses;
 147         struct TCP_Server_Info *server;
 148
 149         /*
 150          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 151          * check for tcp and smb session status done differently
 152          * for those three - in the calling routine.
 153          */
 154         if (tcon == NULL)
 155                 return rc;
 156
 157         if (smb2_command == SMB2_TREE_CONNECT)
 158                 return rc;
 159
 160         if (tcon->tidStatus == CifsExiting) {
 161                 /*
 162                  * only tree disconnect, open, and write,
 163                  * (and ulogoff which does not have tcon)
 164                  * are allowed as we start force umount.
 165                  */
 166                 if ((smb2_command != SMB2_WRITE) &&
 167                    (smb2_command != SMB2_CREATE) &&
 168                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 169                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 170                                  smb2_command);
 171                         return -ENODEV;
 172                 }
 173         }
 174         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 175             (!tcon->ses->server))
 176                 return -EIO;
 177
 178         ses = tcon->ses;
 179         server = ses->server;
 180
 181         /*
 182          * Give demultiplex thread up to 10 seconds to reconnect, should be
 183          * greater than cifs socket timeout which is 7 seconds
 184          */
 185         while (server->tcpStatus == CifsNeedReconnect) {
 186                 /*
 187                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 188                  * here since they are implicitly done when session drops.
 189                  */
 190                 switch (smb2_command) {
 191                 /*
 192                  * BB Should we keep oplock break and add flush to exceptions?
 193                  */
 194                 case SMB2_TREE_DISCONNECT:
 195                 case SMB2_CANCEL:
 196                 case SMB2_CLOSE:
 197                 case SMB2_OPLOCK_BREAK:
 198                         return -EAGAIN;
 199                 }
 200
 201                 wait_event_interruptible_timeout(server->response_q,
 202                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 203
 204                 /* are we still trying to reconnect? */
 205                 if (server->tcpStatus != CifsNeedReconnect)
 206                         break;
 207
 208                 /*
 209                  * on "soft" mounts we wait once. Hard mounts keep
 210                  * retrying until process is killed or server comes
 211                  * back on-line
 212                  */
 213                 if (!tcon->retry) {
 214                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 215                         return -EHOSTDOWN;
 216                 }
 217         }
 218
 219         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 220                 return rc;
 221
 222         nls_codepage = load_nls_default();
 223
 224         /*
 225          * need to prevent multiple threads trying to simultaneously reconnect
 226          * the same SMB session
 227          */
 228         mutex_lock(&tcon->ses->session_mutex);
 229         rc = cifs_negotiate_protocol(0, tcon->ses);
 230         if (!rc && tcon->ses->need_reconnect)
 231                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 232
 233         if (rc || !tcon->need_reconnect) {
 234                 mutex_unlock(&tcon->ses->session_mutex);
 235                 goto out;
 236         }
 237
 238         cifs_mark_open_files_invalid(tcon);
 239         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 240         mutex_unlock(&tcon->ses->session_mutex);
 241         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 242         if (rc)
 243                 goto out;
 244         atomic_inc(&tconInfoReconnectCount);
 245 out:
 246         /*
 247          * Check if handle based operation so we know whether we can continue
 248          * or not without returning to caller to reset file handle.
 249          */
 250         /*
 251          * BB Is flush done by server on drop of tcp session? Should we special
 252          * case it and skip above?
 253          */
 254         switch (smb2_command) {
 255         case SMB2_FLUSH:
 256         case SMB2_READ:
 257         case SMB2_WRITE:
 258         case SMB2_LOCK:
 259         case SMB2_IOCTL:
 260         case SMB2_QUERY_DIRECTORY:
 261         case SMB2_CHANGE_NOTIFY:
 262         case SMB2_QUERY_INFO:
 263         case SMB2_SET_INFO:
 264                 return -EAGAIN;
 265         }
 266         unload_nls(nls_codepage);
 267         return rc;
 268 }
 269
 270 /*
 271  * Allocate and return pointer to an SMB request hdr, and set basic
 272  * SMB information in the SMB header. If the return code is zero, this
 273  * function must have filled in request_buf pointer.
 274  */
 275 static int
 276 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 277                 void **request_buf)
 278 {
 279         int rc = 0;
 280
 281         rc = smb2_reconnect(smb2_command, tcon);
 282         if (rc)
 283                 return rc;
 284
 285         /* BB eventually switch this to SMB2 specific small buf size */
 286         *request_buf = cifs_small_buf_get();
 287         if (*request_buf == NULL) {
 288                 /* BB should we add a retry in here if not a writepage? */
 289                 return -ENOMEM;
 290         }
 291
 292         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
 293
 294         if (tcon != NULL) {
 295 #ifdef CONFIG_CIFS_STATS2
 296                 uint16_t com_code = le16_to_cpu(smb2_command);
 297                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 298 #endif
 299                 cifs_stats_inc(&tcon->num_smbs_sent);
 300         }
 301
 302         return rc;
 303 }
 304
 305 #ifdef CONFIG_CIFS_SMB311
 306 /* offset is sizeof smb2_negotiate_req - 4 but rounded up to 8 bytes */
 307 #define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) - 4 */
 308
 309
 310 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
 311 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
 312
 313 static void
 314 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 315 {
 316         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 317         pneg_ctxt->DataLength = cpu_to_le16(38);
 318         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 319         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 320         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 321         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 322 }
 323
 324 static void
 325 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 326 {
 327         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 328         pneg_ctxt->DataLength = cpu_to_le16(6);
 329         pneg_ctxt->CipherCount = cpu_to_le16(2);
 330         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 331         pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 332 }
 333
 334 static void
 335 assemble_neg_contexts(struct smb2_negotiate_req *req)
 336 {
 337
 338         /* +4 is to account for the RFC1001 len field */
 339         char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT + 4;
 340
 341         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 342         /* Add 2 to size to round to 8 byte boundary */
 343         pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
 344         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 345         req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
 346         req->NegotiateContextCount = cpu_to_le16(2);
 347         inc_rfc1001_len(req, 4 + sizeof(struct smb2_preauth_neg_context) + 2
 348                         + sizeof(struct smb2_encryption_neg_context)); /* calculate hash */
 349 }
 350 #else
 351 static void assemble_neg_contexts(struct smb2_negotiate_req *req)
 352 {
 353         return;
 354 }
 355 #endif /* SMB311 */
 356
 357
 358 /*
 359  *
 360  *      SMB2 Worker functions follow:
 361  *
 362  *      The general structure of the worker functions is:
 363  *      1) Call smb2_init (assembles SMB2 header)
 364  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 365  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 366  *      4) Decode SMB2 command specific fields in the fixed length area
 367  *      5) Decode variable length data area (if any for this SMB2 command type)
 368  *      6) Call free smb buffer
 369  *      7) return
 370  *
 371  */
 372
 373 int
 374 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 375 {
 376         struct smb2_negotiate_req *req;
 377         struct smb2_negotiate_rsp *rsp;
 378         struct kvec iov[1];
 379         int rc = 0;
 380         int resp_buftype;
 381         struct TCP_Server_Info *server = ses->server;
 382         int blob_offset, blob_length;
 383         char *security_blob;
 384         int flags = CIFS_NEG_OP;
 385
 386         cifs_dbg(FYI, "Negotiate protocol\n");
 387
 388         if (!server) {
 389                 WARN(1, "%s: server is NULL!\n", __func__);
 390                 return -EIO;
 391         }
 392
 393         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 394         if (rc)
 395                 return rc;
 396
 397         req->hdr.SessionId = 0;
 398
 399         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 400
 401         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
 402         inc_rfc1001_len(req, 2);
 403
 404         /* only one of SMB2 signing flags may be set in SMB2 request */
 405         if (ses->sign)
 406                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 407         else if (global_secflags & CIFSSEC_MAY_SIGN)
 408                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 409         else
 410                 req->SecurityMode = 0;
 411
 412         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 413
 414         /* ClientGUID must be zero for SMB2.02 dialect */
 415         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 416                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 417         else {
 418                 memcpy(req->ClientGUID, server->client_guid,
 419                         SMB2_CLIENT_GUID_SIZE);
 420                 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
 421                         assemble_neg_contexts(req);
 422         }
 423         iov[0].iov_base = (char *)req;
 424         /* 4 for rfc1002 length field */
 425         iov[0].iov_len = get_rfc1002_length(req) + 4;
 426
 427         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 428
 429         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 430         /*
 431          * No tcon so can't do
 432          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 433          */
 434         if (rc != 0)
 435                 goto neg_exit;
 436
 437         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 438
 439         /* BB we may eventually want to match the negotiated vs. requested
 440            dialect, even though we are only requesting one at a time */
 441         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 442                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 443         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 444                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 445         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 446                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 447         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 448                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 449 #ifdef CONFIG_CIFS_SMB311
 450         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 451                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 452 #endif /* SMB311 */
 453         else {
 454                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 455                          le16_to_cpu(rsp->DialectRevision));
 456                 rc = -EIO;
 457                 goto neg_exit;
 458         }
 459         server->dialect = le16_to_cpu(rsp->DialectRevision);
 460
 461         /* SMB2 only has an extended negflavor */
 462         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 463         /* set it to the maximum buffer size value we can send with 1 credit */
 464         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 465                                SMB2_MAX_BUFFER_SIZE);
 466         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 467         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 468         /* BB Do we need to validate the SecurityMode? */
 469         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 470         server->capabilities = le32_to_cpu(rsp->Capabilities);
 471         /* Internal types */
 472         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 473
 474         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 475                                                &rsp->hdr);
 476         /*
 477          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 478          * for us will be
 479          *      ses->sectype = RawNTLMSSP;
 480          * but for time being this is our only auth choice so doesn't matter.
 481          * We just found a server which sets blob length to zero expecting raw.
 482          */
 483         if (blob_length == 0)
 484                 cifs_dbg(FYI, "missing security blob on negprot\n");
 485
 486         rc = cifs_enable_signing(server, ses->sign);
 487         if (rc)
 488                 goto neg_exit;
 489         if (blob_length) {
 490                 rc = decode_negTokenInit(security_blob, blob_length, server);
 491                 if (rc == 1)
 492                         rc = 0;
 493                 else if (rc == 0)
 494                         rc = -EIO;
 495         }
 496 neg_exit:
 497         free_rsp_buf(resp_buftype, rsp);
 498         return rc;
 499 }
 500
 501 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 502 {
 503         int rc = 0;
 504         struct validate_negotiate_info_req vneg_inbuf;
 505         struct validate_negotiate_info_rsp *pneg_rsp;
 506         u32 rsplen;
 507
 508         cifs_dbg(FYI, "validate negotiate\n");
 509
 510         /*
 511          * validation ioctl must be signed, so no point sending this if we
 512          * can not sign it.  We could eventually change this to selectively
 513          * sign just this, the first and only signed request on a connection.
 514          * This is good enough for now since a user who wants better security
 515          * would also enable signing on the mount. Having validation of
 516          * negotiate info for signed connections helps reduce attack vectors
 517          */
 518         if (tcon->ses->server->sign == false)
 519                 return 0; /* validation requires signing */
 520
 521         vneg_inbuf.Capabilities =
 522                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 523         memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
 524                                         SMB2_CLIENT_GUID_SIZE);
 525
 526         if (tcon->ses->sign)
 527                 vneg_inbuf.SecurityMode =
 528                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 529         else if (global_secflags & CIFSSEC_MAY_SIGN)
 530                 vneg_inbuf.SecurityMode =
 531                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 532         else
 533                 vneg_inbuf.SecurityMode = 0;
 534
 535         vneg_inbuf.DialectCount = cpu_to_le16(1);
 536         vneg_inbuf.Dialects[0] =
 537                 cpu_to_le16(tcon->ses->server->vals->protocol_id);
 538
 539         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 540                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 541                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
 542                 (char **)&pneg_rsp, &rsplen);
 543
 544         if (rc != 0) {
 545                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 546                 return -EIO;
 547         }
 548
 549         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
 550                 cifs_dbg(VFS, "invalid size of protocol negotiate response\n");
 551                 return -EIO;
 552         }
 553
 554         /* check validate negotiate info response matches what we got earlier */
 555         if (pneg_rsp->Dialect !=
 556                         cpu_to_le16(tcon->ses->server->vals->protocol_id))
 557                 goto vneg_out;
 558
 559         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 560                 goto vneg_out;
 561
 562         /* do not validate server guid because not saved at negprot time yet */
 563
 564         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 565               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 566                 goto vneg_out;
 567
 568         /* validate negotiate successful */
 569         cifs_dbg(FYI, "validate negotiate info successful\n");
 570         return 0;
 571
 572 vneg_out:
 573         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 574         return -EIO;
 575 }
 576
 577 int
 578 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 579                 const struct nls_table *nls_cp)
 580 {
 581         struct smb2_sess_setup_req *req;
 582         struct smb2_sess_setup_rsp *rsp = NULL;
 583         struct kvec iov[2];
 584         int rc = 0;
 585         int resp_buftype = CIFS_NO_BUFFER;
 586         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 587         struct TCP_Server_Info *server = ses->server;
 588         u16 blob_length = 0;
 589         struct key *spnego_key = NULL;
 590         char *security_blob = NULL;
 591         unsigned char *ntlmssp_blob = NULL;
 592         bool use_spnego = false; /* else use raw ntlmssp */
 593
 594         cifs_dbg(FYI, "Session Setup\n");
 595
 596         if (!server) {
 597                 WARN(1, "%s: server is NULL!\n", __func__);
 598                 return -EIO;
 599         }
 600
 601         /*
 602          * If we are here due to reconnect, free per-smb session key
 603          * in case signing was required.
 604          */
 605         kfree(ses->auth_key.response);
 606         ses->auth_key.response = NULL;
 607
 608         /*
 609          * If memory allocation is successful, caller of this function
 610          * frees it.
 611          */
 612         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 613         if (!ses->ntlmssp)
 614                 return -ENOMEM;
 615         ses->ntlmssp->sesskey_per_smbsess = true;
 616
 617         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
 618         if (ses->sectype != Kerberos && ses->sectype != RawNTLMSSP)
 619                 ses->sectype = RawNTLMSSP;
 620
 621 ssetup_ntlmssp_authenticate:
 622         if (phase == NtLmChallenge)
 623                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 624
 625         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 626         if (rc)
 627                 return rc;
 628
 629         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 630         req->Flags = 0; /* MBZ */
 631         /* to enable echos and oplocks */
 632         req->hdr.CreditRequest = cpu_to_le16(3);
 633
 634         /* only one of SMB2 signing flags may be set in SMB2 request */
 635         if (server->sign)
 636                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 637         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 638                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 639         else
 640                 req->SecurityMode = 0;
 641
 642         req->Capabilities = 0;
 643         req->Channel = 0; /* MBZ */
 644
 645         iov[0].iov_base = (char *)req;
 646         /* 4 for rfc1002 length field and 1 for pad */
 647         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 648
 649         if (ses->sectype == Kerberos) {
 650 #ifdef CONFIG_CIFS_UPCALL
 651                 struct cifs_spnego_msg *msg;
 652
 653                 spnego_key = cifs_get_spnego_key(ses);
 654                 if (IS_ERR(spnego_key)) {
 655                         rc = PTR_ERR(spnego_key);
 656                         spnego_key = NULL;
 657                         goto ssetup_exit;
 658                 }
 659
 660                 msg = spnego_key->payload.data[0];
 661                 /*
 662                  * check version field to make sure that cifs.upcall is
 663                  * sending us a response in an expected form
 664                  */
 665                 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
 666                         cifs_dbg(VFS,
 667                                   "bad cifs.upcall version. Expected %d got %d",
 668                                   CIFS_SPNEGO_UPCALL_VERSION, msg->version);
 669                         rc = -EKEYREJECTED;
 670                         goto ssetup_exit;
 671                 }
 672                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
 673                                                  GFP_KERNEL);
 674                 if (!ses->auth_key.response) {
 675                         cifs_dbg(VFS,
 676                                 "Kerberos can't allocate (%u bytes) memory",
 677                                 msg->sesskey_len);
 678                         rc = -ENOMEM;
 679                         goto ssetup_exit;
 680                 }
 681                 ses->auth_key.len = msg->sesskey_len;
 682                 blob_length = msg->secblob_len;
 683                 iov[1].iov_base = msg->data + msg->sesskey_len;
 684                 iov[1].iov_len = blob_length;
 685 #else
 686                 rc = -EOPNOTSUPP;
 687                 goto ssetup_exit;
 688 #endif /* CONFIG_CIFS_UPCALL */
 689         } else if (phase == NtLmNegotiate) { /* if not krb5 must be ntlmssp */
 690                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 691                                        GFP_KERNEL);
 692                 if (ntlmssp_blob == NULL) {
 693                         rc = -ENOMEM;
 694                         goto ssetup_exit;
 695                 }
 696                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 697                 if (use_spnego) {
 698                         /* blob_length = build_spnego_ntlmssp_blob(
 699                                         &security_blob,
 700                                         sizeof(struct _NEGOTIATE_MESSAGE),
 701                                         ntlmssp_blob); */
 702                         /* BB eventually need to add this */
 703                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 704                         rc = -EOPNOTSUPP;
 705                         kfree(ntlmssp_blob);
 706                         goto ssetup_exit;
 707                 } else {
 708                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 709                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 710                         security_blob = ntlmssp_blob;
 711                 }
 712                 iov[1].iov_base = security_blob;
 713                 iov[1].iov_len = blob_length;
 714         } else if (phase == NtLmAuthenticate) {
 715                 req->hdr.SessionId = ses->Suid;
 716                 rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
 717                                              nls_cp);
 718                 if (rc) {
 719                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
 720                                  rc);
 721                         goto ssetup_exit; /* BB double check error handling */
 722                 }
 723                 if (use_spnego) {
 724                         /* blob_length = build_spnego_ntlmssp_blob(
 725                                                         &security_blob,
 726                                                         blob_length,
 727                                                         ntlmssp_blob); */
 728                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 729                         rc = -EOPNOTSUPP;
 730                         kfree(ntlmssp_blob);
 731                         goto ssetup_exit;
 732                 } else {
 733                         security_blob = ntlmssp_blob;
 734                 }
 735                 iov[1].iov_base = security_blob;
 736                 iov[1].iov_len = blob_length;
 737         } else {
 738                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
 739                 rc = -EIO;
 740                 goto ssetup_exit;
 741         }
 742
 743         /* Testing shows that buffer offset must be at location of Buffer[0] */
 744         req->SecurityBufferOffset =
 745                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 746                                             1 /* pad */ - 4 /* rfc1001 len */);
 747         req->SecurityBufferLength = cpu_to_le16(blob_length);
 748
 749         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 750
 751         /* BB add code to build os and lm fields */
 752
 753         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 754                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 755
 756         kfree(security_blob);
 757         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 758         ses->Suid = rsp->hdr.SessionId;
 759         if (resp_buftype != CIFS_NO_BUFFER &&
 760             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 761                 if (phase != NtLmNegotiate) {
 762                         cifs_dbg(VFS, "Unexpected more processing error\n");
 763                         goto ssetup_exit;
 764                 }
 765                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 766                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 767                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 768                                  le16_to_cpu(rsp->SecurityBufferOffset));
 769                         rc = -EIO;
 770                         goto ssetup_exit;
 771                 }
 772
 773                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 774                 phase = NtLmChallenge; /* process ntlmssp challenge */
 775                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 776                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 777                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 778         }
 779
 780         /*
 781          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 782          * but at least the raw NTLMSSP case works.
 783          */
 784         /*
 785          * No tcon so can't do
 786          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 787          */
 788         if (rc != 0)
 789                 goto ssetup_exit;
 790
 791         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 792         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
 793                 cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
 794 ssetup_exit:
 795         free_rsp_buf(resp_buftype, rsp);
 796
 797         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 798         if ((phase == NtLmChallenge) && (rc == 0))
 799                 goto ssetup_ntlmssp_authenticate;
 800
 801         if (!rc) {
 802                 mutex_lock(&server->srv_mutex);
 803                 if (server->sign && server->ops->generate_signingkey) {
 804                         rc = server->ops->generate_signingkey(ses);
 805                         kfree(ses->auth_key.response);
 806                         ses->auth_key.response = NULL;
 807                         if (rc) {
 808                                 cifs_dbg(FYI,
 809                                         "SMB3 session key generation failed\n");
 810                                 mutex_unlock(&server->srv_mutex);
 811                                 goto keygen_exit;
 812                         }
 813                 }
 814                 if (!server->session_estab) {
 815                         server->sequence_number = 0x2;
 816                         server->session_estab = true;
 817                 }
 818                 mutex_unlock(&server->srv_mutex);
 819
 820                 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 821                 spin_lock(&GlobalMid_Lock);
 822                 ses->status = CifsGood;
 823                 ses->need_reconnect = false;
 824                 spin_unlock(&GlobalMid_Lock);
 825         }
 826
 827 keygen_exit:
 828         if (!server->sign) {
 829                 kfree(ses->auth_key.response);
 830                 ses->auth_key.response = NULL;
 831         }
 832         if (spnego_key) {
 833                 key_invalidate(spnego_key);
 834                 key_put(spnego_key);
 835         }
 836         kfree(ses->ntlmssp);
 837
 838         return rc;
 839 }
 840
 841 int
 842 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 843 {
 844         struct smb2_logoff_req *req; /* response is also trivial struct */
 845         int rc = 0;
 846         struct TCP_Server_Info *server;
 847
 848         cifs_dbg(FYI, "disconnect session %p\n", ses);
 849
 850         if (ses && (ses->server))
 851                 server = ses->server;
 852         else
 853                 return -EIO;
 854
 855         /* no need to send SMB logoff if uid already closed due to reconnect */
 856         if (ses->need_reconnect)
 857                 goto smb2_session_already_dead;
 858
 859         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 860         if (rc)
 861                 return rc;
 862
 863          /* since no tcon, smb2_init can not do this, so do here */
 864         req->hdr.SessionId = ses->Suid;
 865         if (server->sign)
 866                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 867
 868         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 869         /*
 870          * No tcon so can't do
 871          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 872          */
 873
 874 smb2_session_already_dead:
 875         return rc;
 876 }
 877
 878 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 879 {
 880         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 881 }
 882
 883 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 884
 885 /* These are similar values to what Windows uses */
 886 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
 887 {
 888         tcon->max_chunks = 256;
 889         tcon->max_bytes_chunk = 1048576;
 890         tcon->max_bytes_copy = 16777216;
 891 }
 892
 893 int
 894 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 895           struct cifs_tcon *tcon, const struct nls_table *cp)
 896 {
 897         struct smb2_tree_connect_req *req;
 898         struct smb2_tree_connect_rsp *rsp = NULL;
 899         struct kvec iov[2];
 900         int rc = 0;
 901         int resp_buftype;
 902         int unc_path_len;
 903         struct TCP_Server_Info *server;
 904         __le16 *unc_path = NULL;
 905
 906         cifs_dbg(FYI, "TCON\n");
 907
 908         if ((ses->server) && tree)
 909                 server = ses->server;
 910         else
 911                 return -EIO;
 912
 913         if (tcon && tcon->bad_network_name)
 914                 return -ENOENT;
 915
 916         if ((tcon && tcon->seal) &&
 917             ((ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION) == 0)) {
 918                 cifs_dbg(VFS, "encryption requested but no server support");
 919                 return -EOPNOTSUPP;
 920         }
 921
 922         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 923         if (unc_path == NULL)
 924                 return -ENOMEM;
 925
 926         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 927         unc_path_len *= 2;
 928         if (unc_path_len < 2) {
 929                 kfree(unc_path);
 930                 return -EINVAL;
 931         }
 932
 933         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 934         if (rc) {
 935                 kfree(unc_path);
 936                 return rc;
 937         }
 938
 939         if (tcon == NULL) {
 940                 /* since no tcon, smb2_init can not do this, so do here */
 941                 req->hdr.SessionId = ses->Suid;
 942                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 943                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 944         }
 945
 946         iov[0].iov_base = (char *)req;
 947         /* 4 for rfc1002 length field and 1 for pad */
 948         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 949
 950         /* Testing shows that buffer offset must be at location of Buffer[0] */
 951         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 952                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 953         req->PathLength = cpu_to_le16(unc_path_len - 2);
 954         iov[1].iov_base = unc_path;
 955         iov[1].iov_len = unc_path_len;
 956
 957         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 958
 959         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 960         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 961
 962         if (rc != 0) {
 963                 if (tcon) {
 964                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 965                         tcon->need_reconnect = true;
 966                 }
 967                 goto tcon_error_exit;
 968         }
 969
 970         if (tcon == NULL) {
 971                 ses->ipc_tid = rsp->hdr.TreeId;
 972                 goto tcon_exit;
 973         }
 974
 975         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 976                 cifs_dbg(FYI, "connection to disk share\n");
 977         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 978                 tcon->ipc = true;
 979                 cifs_dbg(FYI, "connection to pipe share\n");
 980         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 981                 tcon->print = true;
 982                 cifs_dbg(FYI, "connection to printer\n");
 983         } else {
 984                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 985                 rc = -EOPNOTSUPP;
 986                 goto tcon_error_exit;
 987         }
 988
 989         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 990         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
 991         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 992         tcon->tidStatus = CifsGood;
 993         tcon->need_reconnect = false;
 994         tcon->tid = rsp->hdr.TreeId;
 995         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
 996
 997         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 998             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 999                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1000         init_copy_chunk_defaults(tcon);
1001         if (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA)
1002                 cifs_dbg(VFS, "Encrypted shares not supported");
1003         if (tcon->ses->server->ops->validate_negotiate)
1004                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1005 tcon_exit:
1006         free_rsp_buf(resp_buftype, rsp);
1007         kfree(unc_path);
1008         return rc;
1009
1010 tcon_error_exit:
1011         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
1012                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1013                 if (tcon)
1014                         tcon->bad_network_name = true;
1015         }
1016         goto tcon_exit;
1017 }
1018
1019 int
1020 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1021 {
1022         struct smb2_tree_disconnect_req *req; /* response is trivial */
1023         int rc = 0;
1024         struct TCP_Server_Info *server;
1025         struct cifs_ses *ses = tcon->ses;
1026
1027         cifs_dbg(FYI, "Tree Disconnect\n");
1028
1029         if (ses && (ses->server))
1030                 server = ses->server;
1031         else
1032                 return -EIO;
1033
1034         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1035                 return 0;
1036
1037         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
1038         if (rc)
1039                 return rc;
1040
1041         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
1042         if (rc)
1043                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1044
1045         return rc;
1046 }
1047
1048
1049 static struct create_durable *
1050 create_durable_buf(void)
1051 {
1052         struct create_durable *buf;
1053
1054         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1055         if (!buf)
1056                 return NULL;
1057
1058         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1059                                         (struct create_durable, Data));
1060         buf->ccontext.DataLength = cpu_to_le32(16);
1061         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1062                                 (struct create_durable, Name));
1063         buf->ccontext.NameLength = cpu_to_le16(4);
1064         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1065         buf->Name[0] = 'D';
1066         buf->Name[1] = 'H';
1067         buf->Name[2] = 'n';
1068         buf->Name[3] = 'Q';
1069         return buf;
1070 }
1071
1072 static struct create_durable *
1073 create_reconnect_durable_buf(struct cifs_fid *fid)
1074 {
1075         struct create_durable *buf;
1076
1077         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1078         if (!buf)
1079                 return NULL;
1080
1081         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1082                                         (struct create_durable, Data));
1083         buf->ccontext.DataLength = cpu_to_le32(16);
1084         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1085                                 (struct create_durable, Name));
1086         buf->ccontext.NameLength = cpu_to_le16(4);
1087         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1088         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1089         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1090         buf->Name[0] = 'D';
1091         buf->Name[1] = 'H';
1092         buf->Name[2] = 'n';
1093         buf->Name[3] = 'C';
1094         return buf;
1095 }
1096
1097 static __u8
1098 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1099                   unsigned int *epoch)
1100 {
1101         char *data_offset;
1102         struct create_context *cc;
1103         unsigned int next;
1104         unsigned int remaining;
1105         char *name;
1106
1107         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1108         remaining = le32_to_cpu(rsp->CreateContextsLength);
1109         cc = (struct create_context *)data_offset;
1110         while (remaining >= sizeof(struct create_context)) {
1111                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1112                 if (le16_to_cpu(cc->NameLength) == 4 &&
1113                     strncmp(name, "RqLs", 4) == 0)
1114                         return server->ops->parse_lease_buf(cc, epoch);
1115
1116                 next = le32_to_cpu(cc->Next);
1117                 if (!next)
1118                         break;
1119                 remaining -= next;
1120                 cc = (struct create_context *)((char *)cc + next);
1121         }
1122
1123         return 0;
1124 }
1125
1126 static int
1127 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1128                   unsigned int *num_iovec, __u8 *oplock)
1129 {
1130         struct smb2_create_req *req = iov[0].iov_base;
1131         unsigned int num = *num_iovec;
1132
1133         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1134         if (iov[num].iov_base == NULL)
1135                 return -ENOMEM;
1136         iov[num].iov_len = server->vals->create_lease_size;
1137         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1138         if (!req->CreateContextsOffset)
1139                 req->CreateContextsOffset = cpu_to_le32(
1140                                 sizeof(struct smb2_create_req) - 4 +
1141                                 iov[num - 1].iov_len);
1142         le32_add_cpu(&req->CreateContextsLength,
1143                      server->vals->create_lease_size);
1144         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1145         *num_iovec = num + 1;
1146         return 0;
1147 }
1148
1149 static struct create_durable_v2 *
1150 create_durable_v2_buf(struct cifs_fid *pfid)
1151 {
1152         struct create_durable_v2 *buf;
1153
1154         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1155         if (!buf)
1156                 return NULL;
1157
1158         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1159                                         (struct create_durable_v2, dcontext));
1160         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1161         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1162                                 (struct create_durable_v2, Name));
1163         buf->ccontext.NameLength = cpu_to_le16(4);
1164
1165         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1166         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1167         get_random_bytes(buf->dcontext.CreateGuid, 16);
1168         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1169
1170         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1171         buf->Name[0] = 'D';
1172         buf->Name[1] = 'H';
1173         buf->Name[2] = '2';
1174         buf->Name[3] = 'Q';
1175         return buf;
1176 }
1177
1178 static struct create_durable_handle_reconnect_v2 *
1179 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1180 {
1181         struct create_durable_handle_reconnect_v2 *buf;
1182
1183         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1184                         GFP_KERNEL);
1185         if (!buf)
1186                 return NULL;
1187
1188         buf->ccontext.DataOffset =
1189                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1190                                      dcontext));
1191         buf->ccontext.DataLength =
1192                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1193         buf->ccontext.NameOffset =
1194                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1195                             Name));
1196         buf->ccontext.NameLength = cpu_to_le16(4);
1197
1198         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1199         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1200         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1201         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1202
1203         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1204         buf->Name[0] = 'D';
1205         buf->Name[1] = 'H';
1206         buf->Name[2] = '2';
1207         buf->Name[3] = 'C';
1208         return buf;
1209 }
1210
1211 static int
1212 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1213                     struct cifs_open_parms *oparms)
1214 {
1215         struct smb2_create_req *req = iov[0].iov_base;
1216         unsigned int num = *num_iovec;
1217
1218         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1219         if (iov[num].iov_base == NULL)
1220                 return -ENOMEM;
1221         iov[num].iov_len = sizeof(struct create_durable_v2);
1222         if (!req->CreateContextsOffset)
1223                 req->CreateContextsOffset =
1224                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1225                                                                 iov[1].iov_len);
1226         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1227         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable_v2));
1228         *num_iovec = num + 1;
1229         return 0;
1230 }
1231
1232 static int
1233 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1234                     struct cifs_open_parms *oparms)
1235 {
1236         struct smb2_create_req *req = iov[0].iov_base;
1237         unsigned int num = *num_iovec;
1238
1239         /* indicate that we don't need to relock the file */
1240         oparms->reconnect = false;
1241
1242         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1243         if (iov[num].iov_base == NULL)
1244                 return -ENOMEM;
1245         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1246         if (!req->CreateContextsOffset)
1247                 req->CreateContextsOffset =
1248                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1249                                                                 iov[1].iov_len);
1250         le32_add_cpu(&req->CreateContextsLength,
1251                         sizeof(struct create_durable_handle_reconnect_v2));
1252         inc_rfc1001_len(&req->hdr,
1253                         sizeof(struct create_durable_handle_reconnect_v2));
1254         *num_iovec = num + 1;
1255         return 0;
1256 }
1257
1258 static int
1259 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1260                     struct cifs_open_parms *oparms, bool use_persistent)
1261 {
1262         struct smb2_create_req *req = iov[0].iov_base;
1263         unsigned int num = *num_iovec;
1264
1265         if (use_persistent) {
1266                 if (oparms->reconnect)
1267                         return add_durable_reconnect_v2_context(iov, num_iovec,
1268                                                                 oparms);
1269                 else
1270                         return add_durable_v2_context(iov, num_iovec, oparms);
1271         }
1272
1273         if (oparms->reconnect) {
1274                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1275                 /* indicate that we don't need to relock the file */
1276                 oparms->reconnect = false;
1277         } else
1278                 iov[num].iov_base = create_durable_buf();
1279         if (iov[num].iov_base == NULL)
1280                 return -ENOMEM;
1281         iov[num].iov_len = sizeof(struct create_durable);
1282         if (!req->CreateContextsOffset)
1283                 req->CreateContextsOffset =
1284                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1285                                                                 iov[1].iov_len);
1286         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1287         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1288         *num_iovec = num + 1;
1289         return 0;
1290 }
1291
1292 int
1293 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1294           __u8 *oplock, struct smb2_file_all_info *buf,
1295           struct smb2_err_rsp **err_buf)
1296 {
1297         struct smb2_create_req *req;
1298         struct smb2_create_rsp *rsp;
1299         struct TCP_Server_Info *server;
1300         struct cifs_tcon *tcon = oparms->tcon;
1301         struct cifs_ses *ses = tcon->ses;
1302         struct kvec iov[4];
1303         int resp_buftype;
1304         int uni_path_len;
1305         __le16 *copy_path = NULL;
1306         int copy_size;
1307         int rc = 0;
1308         unsigned int num_iovecs = 2;
1309         __u32 file_attributes = 0;
1310         char *dhc_buf = NULL, *lc_buf = NULL;
1311
1312         cifs_dbg(FYI, "create/open\n");
1313
1314         if (ses && (ses->server))
1315                 server = ses->server;
1316         else
1317                 return -EIO;
1318
1319         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1320         if (rc)
1321                 return rc;
1322
1323         if (oparms->create_options & CREATE_OPTION_READONLY)
1324                 file_attributes |= ATTR_READONLY;
1325         if (oparms->create_options & CREATE_OPTION_SPECIAL)
1326                 file_attributes |= ATTR_SYSTEM;
1327
1328         req->ImpersonationLevel = IL_IMPERSONATION;
1329         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1330         /* File attributes ignored on open (used in create though) */
1331         req->FileAttributes = cpu_to_le32(file_attributes);
1332         req->ShareAccess = FILE_SHARE_ALL_LE;
1333         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1334         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1335         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1336         /* do not count rfc1001 len field */
1337         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1338
1339         iov[0].iov_base = (char *)req;
1340         /* 4 for rfc1002 length field */
1341         iov[0].iov_len = get_rfc1002_length(req) + 4;
1342
1343         /* MUST set path len (NameLength) to 0 opening root of share */
1344         req->NameLength = cpu_to_le16(uni_path_len - 2);
1345         /* -1 since last byte is buf[0] which is sent below (path) */
1346         iov[0].iov_len--;
1347         if (uni_path_len % 8 != 0) {
1348                 copy_size = uni_path_len / 8 * 8;
1349                 if (copy_size < uni_path_len)
1350                         copy_size += 8;
1351
1352                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1353                 if (!copy_path)
1354                         return -ENOMEM;
1355                 memcpy((char *)copy_path, (const char *)path,
1356                         uni_path_len);
1357                 uni_path_len = copy_size;
1358                 path = copy_path;
1359         }
1360
1361         iov[1].iov_len = uni_path_len;
1362         iov[1].iov_base = path;
1363         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1364         inc_rfc1001_len(req, uni_path_len - 1);
1365
1366         if (!server->oplocks)
1367                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1368
1369         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1370             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1371                 req->RequestedOplockLevel = *oplock;
1372         else {
1373                 rc = add_lease_context(server, iov, &num_iovecs, oplock);
1374                 if (rc) {
1375                         cifs_small_buf_release(req);
1376                         kfree(copy_path);
1377                         return rc;
1378                 }
1379                 lc_buf = iov[num_iovecs-1].iov_base;
1380         }
1381
1382         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1383                 /* need to set Next field of lease context if we request it */
1384                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1385                         struct create_context *ccontext =
1386                             (struct create_context *)iov[num_iovecs-1].iov_base;
1387                         ccontext->Next =
1388                                 cpu_to_le32(server->vals->create_lease_size);
1389                 }
1390
1391                 rc = add_durable_context(iov, &num_iovecs, oparms,
1392                                         tcon->use_persistent);
1393                 if (rc) {
1394                         cifs_small_buf_release(req);
1395                         kfree(copy_path);
1396                         kfree(lc_buf);
1397                         return rc;
1398                 }
1399                 dhc_buf = iov[num_iovecs-1].iov_base;
1400         }
1401
1402         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1403         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1404
1405         if (rc != 0) {
1406                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1407                 if (err_buf)
1408                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1409                                            GFP_KERNEL);
1410                 goto creat_exit;
1411         }
1412
1413         oparms->fid->persistent_fid = rsp->PersistentFileId;
1414         oparms->fid->volatile_fid = rsp->VolatileFileId;
1415
1416         if (buf) {
1417                 memcpy(buf, &rsp->CreationTime, 32);
1418                 buf->AllocationSize = rsp->AllocationSize;
1419                 buf->EndOfFile = rsp->EndofFile;
1420                 buf->Attributes = rsp->FileAttributes;
1421                 buf->NumberOfLinks = cpu_to_le32(1);
1422                 buf->DeletePending = 0;
1423         }
1424
1425         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1426                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1427         else
1428                 *oplock = rsp->OplockLevel;
1429 creat_exit:
1430         kfree(copy_path);
1431         kfree(lc_buf);
1432         kfree(dhc_buf);
1433         free_rsp_buf(resp_buftype, rsp);
1434         return rc;
1435 }
1436
1437 /*
1438  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1439  */
1440 int
1441 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1442            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1443            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1444 {
1445         struct smb2_ioctl_req *req;
1446         struct smb2_ioctl_rsp *rsp;
1447         struct TCP_Server_Info *server;
1448         struct cifs_ses *ses;
1449         struct kvec iov[2];
1450         int resp_buftype;
1451         int num_iovecs;
1452         int rc = 0;
1453
1454         cifs_dbg(FYI, "SMB2 IOCTL\n");
1455
1456         if (out_data != NULL)
1457                 *out_data = NULL;
1458
1459         /* zero out returned data len, in case of error */
1460         if (plen)
1461                 *plen = 0;
1462
1463         if (tcon)
1464                 ses = tcon->ses;
1465         else
1466                 return -EIO;
1467
1468         if (ses && (ses->server))
1469                 server = ses->server;
1470         else
1471                 return -EIO;
1472
1473         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1474         if (rc)
1475                 return rc;
1476
1477         req->CtlCode = cpu_to_le32(opcode);
1478         req->PersistentFileId = persistent_fid;
1479         req->VolatileFileId = volatile_fid;
1480
1481         if (indatalen) {
1482                 req->InputCount = cpu_to_le32(indatalen);
1483                 /* do not set InputOffset if no input data */
1484                 req->InputOffset =
1485                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1486                 iov[1].iov_base = in_data;
1487                 iov[1].iov_len = indatalen;
1488                 num_iovecs = 2;
1489         } else
1490                 num_iovecs = 1;
1491
1492         req->OutputOffset = 0;
1493         req->OutputCount = 0; /* MBZ */
1494
1495         /*
1496          * Could increase MaxOutputResponse, but that would require more
1497          * than one credit. Windows typically sets this smaller, but for some
1498          * ioctls it may be useful to allow server to send more. No point
1499          * limiting what the server can send as long as fits in one credit
1500          */
1501         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1502
1503         if (is_fsctl)
1504                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1505         else
1506                 req->Flags = 0;
1507
1508         iov[0].iov_base = (char *)req;
1509
1510         /*
1511          * If no input data, the size of ioctl struct in
1512          * protocol spec still includes a 1 byte data buffer,
1513          * but if input data passed to ioctl, we do not
1514          * want to double count this, so we do not send
1515          * the dummy one byte of data in iovec[0] if sending
1516          * input data (in iovec[1]). We also must add 4 bytes
1517          * in first iovec to allow for rfc1002 length field.
1518          */
1519
1520         if (indatalen) {
1521                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1522                 inc_rfc1001_len(req, indatalen - 1);
1523         } else
1524                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1525
1526
1527         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1528         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1529
1530         if ((rc != 0) && (rc != -EINVAL)) {
1531                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1532                 goto ioctl_exit;
1533         } else if (rc == -EINVAL) {
1534                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1535                     (opcode != FSCTL_SRV_COPYCHUNK)) {
1536                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1537                         goto ioctl_exit;
1538                 }
1539         }
1540
1541         /* check if caller wants to look at return data or just return rc */
1542         if ((plen == NULL) || (out_data == NULL))
1543                 goto ioctl_exit;
1544
1545         *plen = le32_to_cpu(rsp->OutputCount);
1546
1547         /* We check for obvious errors in the output buffer length and offset */
1548         if (*plen == 0)
1549                 goto ioctl_exit; /* server returned no data */
1550         else if (*plen > 0xFF00) {
1551                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1552                 *plen = 0;
1553                 rc = -EIO;
1554                 goto ioctl_exit;
1555         }
1556
1557         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1558                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1559                         le32_to_cpu(rsp->OutputOffset));
1560                 *plen = 0;
1561                 rc = -EIO;
1562                 goto ioctl_exit;
1563         }
1564
1565         *out_data = kmalloc(*plen, GFP_KERNEL);
1566         if (*out_data == NULL) {
1567                 rc = -ENOMEM;
1568                 goto ioctl_exit;
1569         }
1570
1571         memcpy(*out_data,
1572                (char *)&rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1573                *plen);
1574 ioctl_exit:
1575         free_rsp_buf(resp_buftype, rsp);
1576         return rc;
1577 }
1578
1579 /*
1580  *   Individual callers to ioctl worker function follow
1581  */
1582
1583 int
1584 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1585                      u64 persistent_fid, u64 volatile_fid)
1586 {
1587         int rc;
1588         struct  compress_ioctl fsctl_input;
1589         char *ret_data = NULL;
1590
1591         fsctl_input.CompressionState =
1592                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1593
1594         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1595                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1596                         (char *)&fsctl_input /* data input */,
1597                         2 /* in data len */, &ret_data /* out data */, NULL);
1598
1599         cifs_dbg(FYI, "set compression rc %d\n", rc);
1600
1601         return rc;
1602 }
1603
1604 int
1605 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1606            u64 persistent_fid, u64 volatile_fid)
1607 {
1608         struct smb2_close_req *req;
1609         struct smb2_close_rsp *rsp;
1610         struct TCP_Server_Info *server;
1611         struct cifs_ses *ses = tcon->ses;
1612         struct kvec iov[1];
1613         int resp_buftype;
1614         int rc = 0;
1615
1616         cifs_dbg(FYI, "Close\n");
1617
1618         if (ses && (ses->server))
1619                 server = ses->server;
1620         else
1621                 return -EIO;
1622
1623         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1624         if (rc)
1625                 return rc;
1626
1627         req->PersistentFileId = persistent_fid;
1628         req->VolatileFileId = volatile_fid;
1629
1630         iov[0].iov_base = (char *)req;
1631         /* 4 for rfc1002 length field */
1632         iov[0].iov_len = get_rfc1002_length(req) + 4;
1633
1634         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1635         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1636
1637         if (rc != 0) {
1638                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1639                 goto close_exit;
1640         }
1641
1642         /* BB FIXME - decode close response, update inode for caching */
1643
1644 close_exit:
1645         free_rsp_buf(resp_buftype, rsp);
1646         return rc;
1647 }
1648
1649 static int
1650 validate_buf(unsigned int offset, unsigned int buffer_length,
1651              struct smb2_hdr *hdr, unsigned int min_buf_size)
1652
1653 {
1654         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1655         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1656         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1657         char *end_of_buf = begin_of_buf + buffer_length;
1658
1659
1660         if (buffer_length < min_buf_size) {
1661                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1662                          buffer_length, min_buf_size);
1663                 return -EINVAL;
1664         }
1665
1666         /* check if beyond RFC1001 maximum length */
1667         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1668                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1669                          buffer_length, smb_len);
1670                 return -EINVAL;
1671         }
1672
1673         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1674                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1675                 return -EINVAL;
1676         }
1677
1678         return 0;
1679 }
1680
1681 /*
1682  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1683  * Caller must free buffer.
1684  */
1685 static int
1686 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1687                       struct smb2_hdr *hdr, unsigned int minbufsize,
1688                       char *data)
1689
1690 {
1691         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1692         int rc;
1693
1694         if (!data)
1695                 return -EINVAL;
1696
1697         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1698         if (rc)
1699                 return rc;
1700
1701         memcpy(data, begin_of_buf, buffer_length);
1702
1703         return 0;
1704 }
1705
1706 static int
1707 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1708            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1709            size_t output_len, size_t min_len, void *data)
1710 {
1711         struct smb2_query_info_req *req;
1712         struct smb2_query_info_rsp *rsp = NULL;
1713         struct kvec iov[2];
1714         int rc = 0;
1715         int resp_buftype;
1716         struct TCP_Server_Info *server;
1717         struct cifs_ses *ses = tcon->ses;
1718
1719         cifs_dbg(FYI, "Query Info\n");
1720
1721         if (ses && (ses->server))
1722                 server = ses->server;
1723         else
1724                 return -EIO;
1725
1726         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1727         if (rc)
1728                 return rc;
1729
1730         req->InfoType = SMB2_O_INFO_FILE;
1731         req->FileInfoClass = info_class;
1732         req->PersistentFileId = persistent_fid;
1733         req->VolatileFileId = volatile_fid;
1734         /* 4 for rfc1002 length field and 1 for Buffer */
1735         req->InputBufferOffset =
1736                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1737         req->OutputBufferLength = cpu_to_le32(output_len);
1738
1739         iov[0].iov_base = (char *)req;
1740         /* 4 for rfc1002 length field */
1741         iov[0].iov_len = get_rfc1002_length(req) + 4;
1742
1743         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1744         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1745
1746         if (rc) {
1747                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1748                 goto qinf_exit;
1749         }
1750
1751         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1752                                    le32_to_cpu(rsp->OutputBufferLength),
1753                                    &rsp->hdr, min_len, data);
1754
1755 qinf_exit:
1756         free_rsp_buf(resp_buftype, rsp);
1757         return rc;
1758 }
1759
1760 int
1761 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1762                 u64 persistent_fid, u64 volatile_fid,
1763                 struct smb2_file_all_info *data)
1764 {
1765         return query_info(xid, tcon, persistent_fid, volatile_fid,
1766                           FILE_ALL_INFORMATION,
1767                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
1768                           sizeof(struct smb2_file_all_info), data);
1769 }
1770
1771 int
1772 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1773                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1774 {
1775         return query_info(xid, tcon, persistent_fid, volatile_fid,
1776                           FILE_INTERNAL_INFORMATION,
1777                           sizeof(struct smb2_file_internal_info),
1778                           sizeof(struct smb2_file_internal_info), uniqueid);
1779 }
1780
1781 /*
1782  * This is a no-op for now. We're not really interested in the reply, but
1783  * rather in the fact that the server sent one and that server->lstrp
1784  * gets updated.
1785  *
1786  * FIXME: maybe we should consider checking that the reply matches request?
1787  */
1788 static void
1789 smb2_echo_callback(struct mid_q_entry *mid)
1790 {
1791         struct TCP_Server_Info *server = mid->callback_data;
1792         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1793         unsigned int credits_received = 1;
1794
1795         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1796                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1797
1798         mutex_lock(&server->srv_mutex);
1799         DeleteMidQEntry(mid);
1800         mutex_unlock(&server->srv_mutex);
1801         add_credits(server, credits_received, CIFS_ECHO_OP);
1802 }
1803
1804 int
1805 SMB2_echo(struct TCP_Server_Info *server)
1806 {
1807         struct smb2_echo_req *req;
1808         int rc = 0;
1809         struct kvec iov;
1810         struct smb_rqst rqst = { .rq_iov = &iov,
1811                                  .rq_nvec = 1 };
1812
1813         cifs_dbg(FYI, "In echo request\n");
1814
1815         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1816         if (rc)
1817                 return rc;
1818
1819         req->hdr.CreditRequest = cpu_to_le16(1);
1820
1821         iov.iov_base = (char *)req;
1822         /* 4 for rfc1002 length field */
1823         iov.iov_len = get_rfc1002_length(req) + 4;
1824
1825         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1826                              CIFS_ECHO_OP);
1827         if (rc)
1828                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1829
1830         cifs_small_buf_release(req);
1831         return rc;
1832 }
1833
1834 int
1835 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1836            u64 volatile_fid)
1837 {
1838         struct smb2_flush_req *req;
1839         struct TCP_Server_Info *server;
1840         struct cifs_ses *ses = tcon->ses;
1841         struct kvec iov[1];
1842         int resp_buftype;
1843         int rc = 0;
1844
1845         cifs_dbg(FYI, "Flush\n");
1846
1847         if (ses && (ses->server))
1848                 server = ses->server;
1849         else
1850                 return -EIO;
1851
1852         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1853         if (rc)
1854                 return rc;
1855
1856         req->PersistentFileId = persistent_fid;
1857         req->VolatileFileId = volatile_fid;
1858
1859         iov[0].iov_base = (char *)req;
1860         /* 4 for rfc1002 length field */
1861         iov[0].iov_len = get_rfc1002_length(req) + 4;
1862
1863         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1864
1865         if (rc != 0)
1866                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1867
1868         free_rsp_buf(resp_buftype, iov[0].iov_base);
1869         return rc;
1870 }
1871
1872 /*
1873  * To form a chain of read requests, any read requests after the first should
1874  * have the end_of_chain boolean set to true.
1875  */
1876 static int
1877 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1878                   unsigned int remaining_bytes, int request_type)
1879 {
1880         int rc = -EACCES;
1881         struct smb2_read_req *req = NULL;
1882
1883         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1884         if (rc)
1885                 return rc;
1886         if (io_parms->tcon->ses->server == NULL)
1887                 return -ECONNABORTED;
1888
1889         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1890
1891         req->PersistentFileId = io_parms->persistent_fid;
1892         req->VolatileFileId = io_parms->volatile_fid;
1893         req->ReadChannelInfoOffset = 0; /* reserved */
1894         req->ReadChannelInfoLength = 0; /* reserved */
1895         req->Channel = 0; /* reserved */
1896         req->MinimumCount = 0;
1897         req->Length = cpu_to_le32(io_parms->length);
1898         req->Offset = cpu_to_le64(io_parms->offset);
1899
1900         if (request_type & CHAINED_REQUEST) {
1901                 if (!(request_type & END_OF_CHAIN)) {
1902                         /* 4 for rfc1002 length field */
1903                         req->hdr.NextCommand =
1904                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1905                 } else /* END_OF_CHAIN */
1906                         req->hdr.NextCommand = 0;
1907                 if (request_type & RELATED_REQUEST) {
1908                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1909                         /*
1910                          * Related requests use info from previous read request
1911                          * in chain.
1912                          */
1913                         req->hdr.SessionId = 0xFFFFFFFF;
1914                         req->hdr.TreeId = 0xFFFFFFFF;
1915                         req->PersistentFileId = 0xFFFFFFFF;
1916                         req->VolatileFileId = 0xFFFFFFFF;
1917                 }
1918         }
1919         if (remaining_bytes > io_parms->length)
1920                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1921         else
1922                 req->RemainingBytes = 0;
1923
1924         iov[0].iov_base = (char *)req;
1925         /* 4 for rfc1002 length field */
1926         iov[0].iov_len = get_rfc1002_length(req) + 4;
1927         return rc;
1928 }
1929
1930 static void
1931 smb2_readv_callback(struct mid_q_entry *mid)
1932 {
1933         struct cifs_readdata *rdata = mid->callback_data;
1934         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1935         struct TCP_Server_Info *server = tcon->ses->server;
1936         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1937         unsigned int credits_received = 1;
1938         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1939                                  .rq_nvec = 1,
1940                                  .rq_pages = rdata->pages,
1941                                  .rq_npages = rdata->nr_pages,
1942                                  .rq_pagesz = rdata->pagesz,
1943                                  .rq_tailsz = rdata->tailsz };
1944
1945         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1946                  __func__, mid->mid, mid->mid_state, rdata->result,
1947                  rdata->bytes);
1948
1949         switch (mid->mid_state) {
1950         case MID_RESPONSE_RECEIVED:
1951                 credits_received = le16_to_cpu(buf->CreditRequest);
1952                 /* result already set, check signature */
1953                 if (server->sign) {
1954                         int rc;
1955
1956                         rc = smb2_verify_signature(&rqst, server);
1957                         if (rc)
1958                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1959                                          rc);
1960                 }
1961                 /* FIXME: should this be counted toward the initiating task? */
1962                 task_io_account_read(rdata->got_bytes);
1963                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
1964                 break;
1965         case MID_REQUEST_SUBMITTED:
1966         case MID_RETRY_NEEDED:
1967                 rdata->result = -EAGAIN;
1968                 if (server->sign && rdata->got_bytes)
1969                         /* reset bytes number since we can not check a sign */
1970                         rdata->got_bytes = 0;
1971                 /* FIXME: should this be counted toward the initiating task? */
1972                 task_io_account_read(rdata->got_bytes);
1973                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
1974                 break;
1975         default:
1976                 if (rdata->result != -ENODATA)
1977                         rdata->result = -EIO;
1978         }
1979
1980         if (rdata->result)
1981                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1982
1983         queue_work(cifsiod_wq, &rdata->work);
1984         mutex_lock(&server->srv_mutex);
1985         DeleteMidQEntry(mid);
1986         mutex_unlock(&server->srv_mutex);
1987         add_credits(server, credits_received, 0);
1988 }
1989
1990 /* smb2_async_readv - send an async write, and set up mid to handle result */
1991 int
1992 smb2_async_readv(struct cifs_readdata *rdata)
1993 {
1994         int rc, flags = 0;
1995         struct smb2_hdr *buf;
1996         struct cifs_io_parms io_parms;
1997         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1998                                  .rq_nvec = 1 };
1999         struct TCP_Server_Info *server;
2000
2001         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
2002                  __func__, rdata->offset, rdata->bytes);
2003
2004         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
2005         io_parms.offset = rdata->offset;
2006         io_parms.length = rdata->bytes;
2007         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
2008         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
2009         io_parms.pid = rdata->pid;
2010
2011         server = io_parms.tcon->ses->server;
2012
2013         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
2014         if (rc) {
2015                 if (rc == -EAGAIN && rdata->credits) {
2016                         /* credits was reset by reconnect */
2017                         rdata->credits = 0;
2018                         /* reduce in_flight value since we won't send the req */
2019                         spin_lock(&server->req_lock);
2020                         server->in_flight--;
2021                         spin_unlock(&server->req_lock);
2022                 }
2023                 return rc;
2024         }
2025
2026         buf = (struct smb2_hdr *)rdata->iov.iov_base;
2027         /* 4 for rfc1002 length field */
2028         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
2029
2030         if (rdata->credits) {
2031                 buf->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2032                                                 SMB2_MAX_BUFFER_SIZE));
2033                 spin_lock(&server->req_lock);
2034                 server->credits += rdata->credits -
2035                                                 le16_to_cpu(buf->CreditCharge);
2036                 spin_unlock(&server->req_lock);
2037                 wake_up(&server->request_q);
2038                 flags = CIFS_HAS_CREDITS;
2039         }
2040
2041         kref_get(&rdata->refcount);
2042         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2043                              cifs_readv_receive, smb2_readv_callback,
2044                              rdata, flags);
2045         if (rc) {
2046                 kref_put(&rdata->refcount, cifs_readdata_release);
2047                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
2048         }
2049
2050         cifs_small_buf_release(buf);
2051         return rc;
2052 }
2053
2054 int
2055 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
2056           unsigned int *nbytes, char **buf, int *buf_type)
2057 {
2058         int resp_buftype, rc = -EACCES;
2059         struct smb2_read_rsp *rsp = NULL;
2060         struct kvec iov[1];
2061
2062         *nbytes = 0;
2063         rc = smb2_new_read_req(iov, io_parms, 0, 0);
2064         if (rc)
2065                 return rc;
2066
2067         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
2068                           &resp_buftype, CIFS_LOG_ERROR);
2069
2070         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
2071
2072         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
2073                 free_rsp_buf(resp_buftype, iov[0].iov_base);
2074                 return 0;
2075         }
2076
2077         if (rc) {
2078                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2079                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
2080         } else {
2081                 *nbytes = le32_to_cpu(rsp->DataLength);
2082                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
2083                     (*nbytes > io_parms->length)) {
2084                         cifs_dbg(FYI, "bad length %d for count %d\n",
2085                                  *nbytes, io_parms->length);
2086                         rc = -EIO;
2087                         *nbytes = 0;
2088                 }
2089         }
2090
2091         if (*buf) {
2092                 memcpy(*buf, (char *)&rsp->hdr.ProtocolId + rsp->DataOffset,
2093                        *nbytes);
2094                 free_rsp_buf(resp_buftype, iov[0].iov_base);
2095         } else if (resp_buftype != CIFS_NO_BUFFER) {
2096                 *buf = iov[0].iov_base;
2097                 if (resp_buftype == CIFS_SMALL_BUFFER)
2098                         *buf_type = CIFS_SMALL_BUFFER;
2099                 else if (resp_buftype == CIFS_LARGE_BUFFER)
2100                         *buf_type = CIFS_LARGE_BUFFER;
2101         }
2102         return rc;
2103 }
2104
2105 /*
2106  * Check the mid_state and signature on received buffer (if any), and queue the
2107  * workqueue completion task.
2108  */
2109 static void
2110 smb2_writev_callback(struct mid_q_entry *mid)
2111 {
2112         struct cifs_writedata *wdata = mid->callback_data;
2113         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2114         struct TCP_Server_Info *server = tcon->ses->server;
2115         unsigned int written;
2116         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
2117         unsigned int credits_received = 1;
2118
2119         switch (mid->mid_state) {
2120         case MID_RESPONSE_RECEIVED:
2121                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
2122                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
2123                 if (wdata->result != 0)
2124                         break;
2125
2126                 written = le32_to_cpu(rsp->DataLength);
2127                 /*
2128                  * Mask off high 16 bits when bytes written as returned
2129                  * by the server is greater than bytes requested by the
2130                  * client. OS/2 servers are known to set incorrect
2131                  * CountHigh values.
2132                  */
2133                 if (written > wdata->bytes)
2134                         written &= 0xFFFF;
2135
2136                 if (written < wdata->bytes)
2137                         wdata->result = -ENOSPC;
2138                 else
2139                         wdata->bytes = written;
2140                 break;
2141         case MID_REQUEST_SUBMITTED:
2142         case MID_RETRY_NEEDED:
2143                 wdata->result = -EAGAIN;
2144                 break;
2145         default:
2146                 wdata->result = -EIO;
2147                 break;
2148         }
2149
2150         if (wdata->result)
2151                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2152
2153         queue_work(cifsiod_wq, &wdata->work);
2154         mutex_lock(&server->srv_mutex);
2155         DeleteMidQEntry(mid);
2156         mutex_unlock(&server->srv_mutex);
2157         add_credits(tcon->ses->server, credits_received, 0);
2158 }
2159
2160 /* smb2_async_writev - send an async write, and set up mid to handle result */
2161 int
2162 smb2_async_writev(struct cifs_writedata *wdata,
2163                   void (*release)(struct kref *kref))
2164 {
2165         int rc = -EACCES, flags = 0;
2166         struct smb2_write_req *req = NULL;
2167         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2168         struct TCP_Server_Info *server = tcon->ses->server;
2169         struct kvec iov;
2170         struct smb_rqst rqst;
2171
2172         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
2173         if (rc) {
2174                 if (rc == -EAGAIN && wdata->credits) {
2175                         /* credits was reset by reconnect */
2176                         wdata->credits = 0;
2177                         /* reduce in_flight value since we won't send the req */
2178                         spin_lock(&server->req_lock);
2179                         server->in_flight--;
2180                         spin_unlock(&server->req_lock);
2181                 }
2182                 goto async_writev_out;
2183         }
2184
2185         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
2186
2187         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
2188         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
2189         req->WriteChannelInfoOffset = 0;
2190         req->WriteChannelInfoLength = 0;
2191         req->Channel = 0;
2192         req->Offset = cpu_to_le64(wdata->offset);
2193         /* 4 for rfc1002 length field */
2194         req->DataOffset = cpu_to_le16(
2195                                 offsetof(struct smb2_write_req, Buffer) - 4);
2196         req->RemainingBytes = 0;
2197
2198         /* 4 for rfc1002 length field and 1 for Buffer */
2199         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
2200         iov.iov_base = req;
2201
2202         rqst.rq_iov = &iov;
2203         rqst.rq_nvec = 1;
2204         rqst.rq_pages = wdata->pages;
2205         rqst.rq_npages = wdata->nr_pages;
2206         rqst.rq_pagesz = wdata->pagesz;
2207         rqst.rq_tailsz = wdata->tailsz;
2208
2209         cifs_dbg(FYI, "async write at %llu %u bytes\n",
2210                  wdata->offset, wdata->bytes);
2211
2212         req->Length = cpu_to_le32(wdata->bytes);
2213
2214         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
2215
2216         if (wdata->credits) {
2217                 req->hdr.CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2218                                                     SMB2_MAX_BUFFER_SIZE));
2219                 spin_lock(&server->req_lock);
2220                 server->credits += wdata->credits -
2221                                         le16_to_cpu(req->hdr.CreditCharge);
2222                 spin_unlock(&server->req_lock);
2223                 wake_up(&server->request_q);
2224                 flags = CIFS_HAS_CREDITS;
2225         }
2226
2227         kref_get(&wdata->refcount);
2228         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, wdata,
2229                              flags);
2230
2231         if (rc) {
2232                 kref_put(&wdata->refcount, release);
2233                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2234         }
2235
2236 async_writev_out:
2237         cifs_small_buf_release(req);
2238         return rc;
2239 }
2240
2241 /*
2242  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
2243  * The length field from io_parms must be at least 1 and indicates a number of
2244  * elements with data to write that begins with position 1 in iov array. All
2245  * data length is specified by count.
2246  */
2247 int
2248 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
2249            unsigned int *nbytes, struct kvec *iov, int n_vec)
2250 {
2251         int rc = 0;
2252         struct smb2_write_req *req = NULL;
2253         struct smb2_write_rsp *rsp = NULL;
2254         int resp_buftype;
2255         *nbytes = 0;
2256
2257         if (n_vec < 1)
2258                 return rc;
2259
2260         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
2261         if (rc)
2262                 return rc;
2263
2264         if (io_parms->tcon->ses->server == NULL)
2265                 return -ECONNABORTED;
2266
2267         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
2268
2269         req->PersistentFileId = io_parms->persistent_fid;
2270         req->VolatileFileId = io_parms->volatile_fid;
2271         req->WriteChannelInfoOffset = 0;
2272         req->WriteChannelInfoLength = 0;
2273         req->Channel = 0;
2274         req->Length = cpu_to_le32(io_parms->length);
2275         req->Offset = cpu_to_le64(io_parms->offset);
2276         /* 4 for rfc1002 length field */
2277         req->DataOffset = cpu_to_le16(
2278                                 offsetof(struct smb2_write_req, Buffer) - 4);
2279         req->RemainingBytes = 0;
2280
2281         iov[0].iov_base = (char *)req;
2282         /* 4 for rfc1002 length field and 1 for Buffer */
2283         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2284
2285         /* length of entire message including data to be written */
2286         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2287
2288         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2289                           &resp_buftype, 0);
2290         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
2291
2292         if (rc) {
2293                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2294                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2295         } else
2296                 *nbytes = le32_to_cpu(rsp->DataLength);
2297
2298         free_rsp_buf(resp_buftype, rsp);
2299         return rc;
2300 }
2301
2302 static unsigned int
2303 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2304 {
2305         int len;
2306         unsigned int entrycount = 0;
2307         unsigned int next_offset = 0;
2308         FILE_DIRECTORY_INFO *entryptr;
2309
2310         if (bufstart == NULL)
2311                 return 0;
2312
2313         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2314
2315         while (1) {
2316                 entryptr = (FILE_DIRECTORY_INFO *)
2317                                         ((char *)entryptr + next_offset);
2318
2319                 if ((char *)entryptr + size > end_of_buf) {
2320                         cifs_dbg(VFS, "malformed search entry would overflow\n");
2321                         break;
2322                 }
2323
2324                 len = le32_to_cpu(entryptr->FileNameLength);
2325                 if ((char *)entryptr + len + size > end_of_buf) {
2326                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2327                                  end_of_buf);
2328                         break;
2329                 }
2330
2331                 *lastentry = (char *)entryptr;
2332                 entrycount++;
2333
2334                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2335                 if (!next_offset)
2336                         break;
2337         }
2338
2339         return entrycount;
2340 }
2341
2342 /*
2343  * Readdir/FindFirst
2344  */
2345 int
2346 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2347                      u64 persistent_fid, u64 volatile_fid, int index,
2348                      struct cifs_search_info *srch_inf)
2349 {
2350         struct smb2_query_directory_req *req;
2351         struct smb2_query_directory_rsp *rsp = NULL;
2352         struct kvec iov[2];
2353         int rc = 0;
2354         int len;
2355         int resp_buftype = CIFS_NO_BUFFER;
2356         unsigned char *bufptr;
2357         struct TCP_Server_Info *server;
2358         struct cifs_ses *ses = tcon->ses;
2359         __le16 asteriks = cpu_to_le16('*');
2360         char *end_of_smb;
2361         unsigned int output_size = CIFSMaxBufSize;
2362         size_t info_buf_size;
2363
2364         if (ses && (ses->server))
2365                 server = ses->server;
2366         else
2367                 return -EIO;
2368
2369         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2370         if (rc)
2371                 return rc;
2372
2373         switch (srch_inf->info_level) {
2374         case SMB_FIND_FILE_DIRECTORY_INFO:
2375                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2376                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2377                 break;
2378         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2379                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2380                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2381                 break;
2382         default:
2383                 cifs_dbg(VFS, "info level %u isn't supported\n",
2384                          srch_inf->info_level);
2385                 rc = -EINVAL;
2386                 goto qdir_exit;
2387         }
2388
2389         req->FileIndex = cpu_to_le32(index);
2390         req->PersistentFileId = persistent_fid;
2391         req->VolatileFileId = volatile_fid;
2392
2393         len = 0x2;
2394         bufptr = req->Buffer;
2395         memcpy(bufptr, &asteriks, len);
2396
2397         req->FileNameOffset =
2398                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2399         req->FileNameLength = cpu_to_le16(len);
2400         /*
2401          * BB could be 30 bytes or so longer if we used SMB2 specific
2402          * buffer lengths, but this is safe and close enough.
2403          */
2404         output_size = min_t(unsigned int, output_size, server->maxBuf);
2405         output_size = min_t(unsigned int, output_size, 2 << 15);
2406         req->OutputBufferLength = cpu_to_le32(output_size);
2407
2408         iov[0].iov_base = (char *)req;
2409         /* 4 for RFC1001 length and 1 for Buffer */
2410         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2411
2412         iov[1].iov_base = (char *)(req->Buffer);
2413         iov[1].iov_len = len;
2414
2415         inc_rfc1001_len(req, len - 1 /* Buffer */);
2416
2417         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2418         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2419
2420         if (rc) {
2421                 if (rc == -ENODATA && rsp->hdr.Status == STATUS_NO_MORE_FILES) {
2422                         srch_inf->endOfSearch = true;
2423                         rc = 0;
2424                 }
2425                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2426                 goto qdir_exit;
2427         }
2428
2429         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2430                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2431                           info_buf_size);
2432         if (rc)
2433                 goto qdir_exit;
2434
2435         srch_inf->unicode = true;
2436
2437         if (srch_inf->ntwrk_buf_start) {
2438                 if (srch_inf->smallBuf)
2439                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2440                 else
2441                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2442         }
2443         srch_inf->ntwrk_buf_start = (char *)rsp;
2444         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2445                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2446         /* 4 for rfc1002 length field */
2447         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2448         srch_inf->entries_in_buffer =
2449                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2450                                     &srch_inf->last_entry, info_buf_size);
2451         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2452         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2453                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2454                  srch_inf->srch_entries_start, srch_inf->last_entry);
2455         if (resp_buftype == CIFS_LARGE_BUFFER)
2456                 srch_inf->smallBuf = false;
2457         else if (resp_buftype == CIFS_SMALL_BUFFER)
2458                 srch_inf->smallBuf = true;
2459         else
2460                 cifs_dbg(VFS, "illegal search buffer type\n");
2461
2462         return rc;
2463
2464 qdir_exit:
2465         free_rsp_buf(resp_buftype, rsp);
2466         return rc;
2467 }
2468
2469 static int
2470 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2471                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2472                unsigned int num, void **data, unsigned int *size)
2473 {
2474         struct smb2_set_info_req *req;
2475         struct smb2_set_info_rsp *rsp = NULL;
2476         struct kvec *iov;
2477         int rc = 0;
2478         int resp_buftype;
2479         unsigned int i;
2480         struct TCP_Server_Info *server;
2481         struct cifs_ses *ses = tcon->ses;
2482
2483         if (ses && (ses->server))
2484                 server = ses->server;
2485         else
2486                 return -EIO;
2487
2488         if (!num)
2489                 return -EINVAL;
2490
2491         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2492         if (!iov)
2493                 return -ENOMEM;
2494
2495         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2496         if (rc) {
2497                 kfree(iov);
2498                 return rc;
2499         }
2500
2501         req->hdr.ProcessId = cpu_to_le32(pid);
2502
2503         req->InfoType = SMB2_O_INFO_FILE;
2504         req->FileInfoClass = info_class;
2505         req->PersistentFileId = persistent_fid;
2506         req->VolatileFileId = volatile_fid;
2507
2508         /* 4 for RFC1001 length and 1 for Buffer */
2509         req->BufferOffset =
2510                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2511         req->BufferLength = cpu_to_le32(*size);
2512
2513         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2514
2515         memcpy(req->Buffer, *data, *size);
2516
2517         iov[0].iov_base = (char *)req;
2518         /* 4 for RFC1001 length */
2519         iov[0].iov_len = get_rfc1002_length(req) + 4;
2520
2521         for (i = 1; i < num; i++) {
2522                 inc_rfc1001_len(req, size[i]);
2523                 le32_add_cpu(&req->BufferLength, size[i]);
2524                 iov[i].iov_base = (char *)data[i];
2525                 iov[i].iov_len = size[i];
2526         }
2527
2528         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2529         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2530
2531         if (rc != 0)
2532                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2533
2534         free_rsp_buf(resp_buftype, rsp);
2535         kfree(iov);
2536         return rc;
2537 }
2538
2539 int
2540 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2541             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2542 {
2543         struct smb2_file_rename_info info;
2544         void **data;
2545         unsigned int size[2];
2546         int rc;
2547         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2548
2549         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2550         if (!data)
2551                 return -ENOMEM;
2552
2553         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2554                               /* 0 = fail if target already exists */
2555         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2556         info.FileNameLength = cpu_to_le32(len);
2557
2558         data[0] = &info;
2559         size[0] = sizeof(struct smb2_file_rename_info);
2560
2561         data[1] = target_file;
2562         size[1] = len + 2 /* null */;
2563
2564         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2565                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2566                            size);
2567         kfree(data);
2568         return rc;
2569 }
2570
2571 int
2572 SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
2573                   u64 persistent_fid, u64 volatile_fid)
2574 {
2575         __u8 delete_pending = 1;
2576         void *data;
2577         unsigned int size;
2578
2579         data = &delete_pending;
2580         size = 1; /* sizeof __u8 */
2581
2582         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2583                         current->tgid, FILE_DISPOSITION_INFORMATION, 1, &data,
2584                         &size);
2585 }
2586
2587 int
2588 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2589                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2590 {
2591         struct smb2_file_link_info info;
2592         void **data;
2593         unsigned int size[2];
2594         int rc;
2595         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2596
2597         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2598         if (!data)
2599                 return -ENOMEM;
2600
2601         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2602                               /* 0 = fail if link already exists */
2603         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2604         info.FileNameLength = cpu_to_le32(len);
2605
2606         data[0] = &info;
2607         size[0] = sizeof(struct smb2_file_link_info);
2608
2609         data[1] = target_file;
2610         size[1] = len + 2 /* null */;
2611
2612         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2613                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2614         kfree(data);
2615         return rc;
2616 }
2617
2618 int
2619 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2620              u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
2621 {
2622         struct smb2_file_eof_info info;
2623         void *data;
2624         unsigned int size;
2625
2626         info.EndOfFile = *eof;
2627
2628         data = &info;
2629         size = sizeof(struct smb2_file_eof_info);
2630
2631         if (is_falloc)
2632                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2633                         pid, FILE_ALLOCATION_INFORMATION, 1, &data, &size);
2634         else
2635                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2636                         pid, FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2637 }
2638
2639 int
2640 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2641               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2642 {
2643         unsigned int size;
2644         size = sizeof(FILE_BASIC_INFO);
2645         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2646                              current->tgid, FILE_BASIC_INFORMATION, 1,
2647                              (void **)&buf, &size);
2648 }
2649
2650 int
2651 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2652                   const u64 persistent_fid, const u64 volatile_fid,
2653                   __u8 oplock_level)
2654 {
2655         int rc;
2656         struct smb2_oplock_break *req = NULL;
2657
2658         cifs_dbg(FYI, "SMB2_oplock_break\n");
2659         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2660
2661         if (rc)
2662                 return rc;
2663
2664         req->VolatileFid = volatile_fid;
2665         req->PersistentFid = persistent_fid;
2666         req->OplockLevel = oplock_level;
2667         req->hdr.CreditRequest = cpu_to_le16(1);
2668
2669         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2670         /* SMB2 buffer freed by function above */
2671
2672         if (rc) {
2673                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2674                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2675         }
2676
2677         return rc;
2678 }
2679
2680 static void
2681 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2682                         struct kstatfs *kst)
2683 {
2684         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2685                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2686         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2687         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2688         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2689         return;
2690 }
2691
2692 static int
2693 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2694                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2695 {
2696         int rc;
2697         struct smb2_query_info_req *req;
2698
2699         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2700
2701         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2702                 return -EIO;
2703
2704         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2705         if (rc)
2706                 return rc;
2707
2708         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2709         req->FileInfoClass = level;
2710         req->PersistentFileId = persistent_fid;
2711         req->VolatileFileId = volatile_fid;
2712         /* 4 for rfc1002 length field and 1 for pad */
2713         req->InputBufferOffset =
2714                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2715         req->OutputBufferLength = cpu_to_le32(
2716                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2717
2718         iov->iov_base = (char *)req;
2719         /* 4 for rfc1002 length field */
2720         iov->iov_len = get_rfc1002_length(req) + 4;
2721         return 0;
2722 }
2723
2724 int
2725 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2726               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2727 {
2728         struct smb2_query_info_rsp *rsp = NULL;
2729         struct kvec iov;
2730         int rc = 0;
2731         int resp_buftype;
2732         struct cifs_ses *ses = tcon->ses;
2733         struct smb2_fs_full_size_info *info = NULL;
2734
2735         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2736                                 sizeof(struct smb2_fs_full_size_info),
2737                                 persistent_fid, volatile_fid);
2738         if (rc)
2739                 return rc;
2740
2741         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2742         if (rc) {
2743                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2744                 goto qfsinf_exit;
2745         }
2746         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2747
2748         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2749                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2750         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2751                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2752                           sizeof(struct smb2_fs_full_size_info));
2753         if (!rc)
2754                 copy_fs_info_to_kstatfs(info, fsdata);
2755
2756 qfsinf_exit:
2757         free_rsp_buf(resp_buftype, iov.iov_base);
2758         return rc;
2759 }
2760
2761 int
2762 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
2763               u64 persistent_fid, u64 volatile_fid, int level)
2764 {
2765         struct smb2_query_info_rsp *rsp = NULL;
2766         struct kvec iov;
2767         int rc = 0;
2768         int resp_buftype, max_len, min_len;
2769         struct cifs_ses *ses = tcon->ses;
2770         unsigned int rsp_len, offset;
2771
2772         if (level == FS_DEVICE_INFORMATION) {
2773                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2774                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2775         } else if (level == FS_ATTRIBUTE_INFORMATION) {
2776                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
2777                 min_len = MIN_FS_ATTR_INFO_SIZE;
2778         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
2779                 max_len = sizeof(struct smb3_fs_ss_info);
2780                 min_len = sizeof(struct smb3_fs_ss_info);
2781         } else {
2782                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
2783                 return -EINVAL;
2784         }
2785
2786         rc = build_qfs_info_req(&iov, tcon, level, max_len,
2787                                 persistent_fid, volatile_fid);
2788         if (rc)
2789                 return rc;
2790
2791         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2792         if (rc) {
2793                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2794                 goto qfsattr_exit;
2795         }
2796         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2797
2798         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
2799         offset = le16_to_cpu(rsp->OutputBufferOffset);
2800         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
2801         if (rc)
2802                 goto qfsattr_exit;
2803
2804         if (level == FS_ATTRIBUTE_INFORMATION)
2805                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
2806                         + (char *)&rsp->hdr, min_t(unsigned int,
2807                         rsp_len, max_len));
2808         else if (level == FS_DEVICE_INFORMATION)
2809                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
2810                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
2811         else if (level == FS_SECTOR_SIZE_INFORMATION) {
2812                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
2813                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
2814                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
2815                 tcon->perf_sector_size =
2816                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
2817         }
2818
2819 qfsattr_exit:
2820         free_rsp_buf(resp_buftype, iov.iov_base);
2821         return rc;
2822 }
2823
2824 int
2825 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2826            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2827            const __u32 num_lock, struct smb2_lock_element *buf)
2828 {
2829         int rc = 0;
2830         struct smb2_lock_req *req = NULL;
2831         struct kvec iov[2];
2832         int resp_buf_type;
2833         unsigned int count;
2834
2835         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2836
2837         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2838         if (rc)
2839                 return rc;
2840
2841         req->hdr.ProcessId = cpu_to_le32(pid);
2842         req->LockCount = cpu_to_le16(num_lock);
2843
2844         req->PersistentFileId = persist_fid;
2845         req->VolatileFileId = volatile_fid;
2846
2847         count = num_lock * sizeof(struct smb2_lock_element);
2848         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2849
2850         iov[0].iov_base = (char *)req;
2851         /* 4 for rfc1002 length field and count for all locks */
2852         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2853         iov[1].iov_base = (char *)buf;
2854         iov[1].iov_len = count;
2855
2856         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2857         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2858         if (rc) {
2859                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2860                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2861         }
2862
2863         return rc;
2864 }
2865
2866 int
2867 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2868           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2869           const __u64 length, const __u64 offset, const __u32 lock_flags,
2870           const bool wait)
2871 {
2872         struct smb2_lock_element lock;
2873
2874         lock.Offset = cpu_to_le64(offset);
2875         lock.Length = cpu_to_le64(length);
2876         lock.Flags = cpu_to_le32(lock_flags);
2877         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2878                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2879
2880         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2881 }
2882
2883 int
2884 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2885                  __u8 *lease_key, const __le32 lease_state)
2886 {
2887         int rc;
2888         struct smb2_lease_ack *req = NULL;
2889
2890         cifs_dbg(FYI, "SMB2_lease_break\n");
2891         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2892
2893         if (rc)
2894                 return rc;
2895
2896         req->hdr.CreditRequest = cpu_to_le16(1);
2897         req->StructureSize = cpu_to_le16(36);
2898         inc_rfc1001_len(req, 12);
2899
2900         memcpy(req->LeaseKey, lease_key, 16);
2901         req->LeaseState = lease_state;
2902
2903         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2904         /* SMB2 buffer freed by function above */
2905
2906         if (rc) {
2907                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2908                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2909         }
2910
2911         return rc;
2912 }