fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/pagemap.h>
  37 #include <linux/xattr.h>
  38 #include "smb2pdu.h"
  39 #include "cifsglob.h"
  40 #include "cifsacl.h"
  41 #include "cifsproto.h"
  42 #include "smb2proto.h"
  43 #include "cifs_unicode.h"
  44 #include "cifs_debug.h"
  45 #include "ntlmssp.h"
  46 #include "smb2status.h"
  47 #include "smb2glob.h"
  48 #include "cifspdu.h"
  49 #include "cifs_spnego.h"
  50
  51 /*
  52  *  The following table defines the expected "StructureSize" of SMB2 requests
  53  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  54  *
  55  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  56  *  indexed by command in host byte order.
  57  */
  58 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  59         /* SMB2_NEGOTIATE */ 36,
  60         /* SMB2_SESSION_SETUP */ 25,
  61         /* SMB2_LOGOFF */ 4,
  62         /* SMB2_TREE_CONNECT */ 9,
  63         /* SMB2_TREE_DISCONNECT */ 4,
  64         /* SMB2_CREATE */ 57,
  65         /* SMB2_CLOSE */ 24,
  66         /* SMB2_FLUSH */ 24,
  67         /* SMB2_READ */ 49,
  68         /* SMB2_WRITE */ 49,
  69         /* SMB2_LOCK */ 48,
  70         /* SMB2_IOCTL */ 57,
  71         /* SMB2_CANCEL */ 4,
  72         /* SMB2_ECHO */ 4,
  73         /* SMB2_QUERY_DIRECTORY */ 33,
  74         /* SMB2_CHANGE_NOTIFY */ 32,
  75         /* SMB2_QUERY_INFO */ 41,
  76         /* SMB2_SET_INFO */ 33,
  77         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  78 };
  79
  80
  81 static void
  82 smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
  83                   const struct cifs_tcon *tcon)
  84 {
  85         struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
  86         char *temp = (char *)hdr;
  87         /* lookup word count ie StructureSize from table */
  88         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
  89
  90         /*
  91          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
  92          * largest operations (Create)
  93          */
  94         memset(temp, 0, 256);
  95
  96         /* Note this is only network field converted to big endian */
  97         hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
  98                         - 4 /*  RFC 1001 length field itself not counted */);
  99
 100         hdr->ProtocolId[0] = 0xFE;
 101         hdr->ProtocolId[1] = 'S';
 102         hdr->ProtocolId[2] = 'M';
 103         hdr->ProtocolId[3] = 'B';
 104         hdr->StructureSize = cpu_to_le16(64);
 105         hdr->Command = smb2_cmd;
 106         if (tcon && tcon->ses && tcon->ses->server) {
 107                 struct TCP_Server_Info *server = tcon->ses->server;
 108
 109                 spin_lock(&server->req_lock);
 110                 /* Request up to 2 credits but don't go over the limit. */
 111                 if (server->credits >= SMB2_MAX_CREDITS_AVAILABLE)
 112                         hdr->CreditRequest = cpu_to_le16(0);
 113                 else
 114                         hdr->CreditRequest = cpu_to_le16(
 115                                 min_t(int, SMB2_MAX_CREDITS_AVAILABLE -
 116                                                 server->credits, 2));
 117                 spin_unlock(&server->req_lock);
 118         } else {
 119                 hdr->CreditRequest = cpu_to_le16(2);
 120         }
 121         hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 122
 123         if (!tcon)
 124                 goto out;
 125
 126         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 127         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 128         if ((tcon->ses) && (tcon->ses->server) &&
 129             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 130                 hdr->CreditCharge = cpu_to_le16(1);
 131         /* else CreditCharge MBZ */
 132
 133         hdr->TreeId = tcon->tid;
 134         /* Uid is not converted */
 135         if (tcon->ses)
 136                 hdr->SessionId = tcon->ses->Suid;
 137
 138         /*
 139          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 140          * to pass the path on the Open SMB prefixed by \\server\share.
 141          * Not sure when we would need to do the augmented path (if ever) and
 142          * setting this flag breaks the SMB2 open operation since it is
 143          * illegal to send an empty path name (without \\server\share prefix)
 144          * when the DFS flag is set in the SMB open header. We could
 145          * consider setting the flag on all operations other than open
 146          * but it is safer to net set it for now.
 147          */
 148 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 149                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 150
 151         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
 152                 hdr->Flags |= SMB2_FLAGS_SIGNED;
 153 out:
 154         pdu->StructureSize2 = cpu_to_le16(parmsize);
 155         return;
 156 }
 157
 158 static int
 159 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 160 {
 161         int rc = 0;
 162         struct nls_table *nls_codepage;
 163         struct cifs_ses *ses;
 164         struct TCP_Server_Info *server;
 165
 166         /*
 167          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 168          * check for tcp and smb session status done differently
 169          * for those three - in the calling routine.
 170          */
 171         if (tcon == NULL)
 172                 return rc;
 173
 174         if (smb2_command == SMB2_TREE_CONNECT)
 175                 return rc;
 176
 177         if (tcon->tidStatus == CifsExiting) {
 178                 /*
 179                  * only tree disconnect, open, and write,
 180                  * (and ulogoff which does not have tcon)
 181                  * are allowed as we start force umount.
 182                  */
 183                 if ((smb2_command != SMB2_WRITE) &&
 184                    (smb2_command != SMB2_CREATE) &&
 185                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 186                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 187                                  smb2_command);
 188                         return -ENODEV;
 189                 }
 190         }
 191         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 192             (!tcon->ses->server))
 193                 return -EIO;
 194
 195         ses = tcon->ses;
 196         server = ses->server;
 197
 198         /*
 199          * Give demultiplex thread up to 10 seconds to reconnect, should be
 200          * greater than cifs socket timeout which is 7 seconds
 201          */
 202         while (server->tcpStatus == CifsNeedReconnect) {
 203                 /*
 204                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 205                  * here since they are implicitly done when session drops.
 206                  */
 207                 switch (smb2_command) {
 208                 /*
 209                  * BB Should we keep oplock break and add flush to exceptions?
 210                  */
 211                 case SMB2_TREE_DISCONNECT:
 212                 case SMB2_CANCEL:
 213                 case SMB2_CLOSE:
 214                 case SMB2_OPLOCK_BREAK:
 215                         return -EAGAIN;
 216                 }
 217
 218                 wait_event_interruptible_timeout(server->response_q,
 219                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 220
 221                 /* are we still trying to reconnect? */
 222                 if (server->tcpStatus != CifsNeedReconnect)
 223                         break;
 224
 225                 /*
 226                  * on "soft" mounts we wait once. Hard mounts keep
 227                  * retrying until process is killed or server comes
 228                  * back on-line
 229                  */
 230                 if (!tcon->retry) {
 231                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 232                         return -EHOSTDOWN;
 233                 }
 234         }
 235
 236         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 237                 return rc;
 238
 239         nls_codepage = load_nls_default();
 240
 241         /*
 242          * need to prevent multiple threads trying to simultaneously reconnect
 243          * the same SMB session
 244          */
 245         mutex_lock(&tcon->ses->session_mutex);
 246         rc = cifs_negotiate_protocol(0, tcon->ses);
 247         if (!rc && tcon->ses->need_reconnect)
 248                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 249
 250         if (rc || !tcon->need_reconnect) {
 251                 mutex_unlock(&tcon->ses->session_mutex);
 252                 goto out;
 253         }
 254
 255         cifs_mark_open_files_invalid(tcon);
 256         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 257         mutex_unlock(&tcon->ses->session_mutex);
 258         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 259         if (rc)
 260                 goto out;
 261         atomic_inc(&tconInfoReconnectCount);
 262 out:
 263         /*
 264          * Check if handle based operation so we know whether we can continue
 265          * or not without returning to caller to reset file handle.
 266          */
 267         /*
 268          * BB Is flush done by server on drop of tcp session? Should we special
 269          * case it and skip above?
 270          */
 271         switch (smb2_command) {
 272         case SMB2_FLUSH:
 273         case SMB2_READ:
 274         case SMB2_WRITE:
 275         case SMB2_LOCK:
 276         case SMB2_IOCTL:
 277         case SMB2_QUERY_DIRECTORY:
 278         case SMB2_CHANGE_NOTIFY:
 279         case SMB2_QUERY_INFO:
 280         case SMB2_SET_INFO:
 281                 return -EAGAIN;
 282         }
 283         unload_nls(nls_codepage);
 284         return rc;
 285 }
 286
 287 /*
 288  * Allocate and return pointer to an SMB request hdr, and set basic
 289  * SMB information in the SMB header. If the return code is zero, this
 290  * function must have filled in request_buf pointer.
 291  */
 292 static int
 293 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 294                 void **request_buf)
 295 {
 296         int rc = 0;
 297
 298         rc = smb2_reconnect(smb2_command, tcon);
 299         if (rc)
 300                 return rc;
 301
 302         /* BB eventually switch this to SMB2 specific small buf size */
 303         *request_buf = cifs_small_buf_get();
 304         if (*request_buf == NULL) {
 305                 /* BB should we add a retry in here if not a writepage? */
 306                 return -ENOMEM;
 307         }
 308
 309         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
 310
 311         if (tcon != NULL) {
 312 #ifdef CONFIG_CIFS_STATS2
 313                 uint16_t com_code = le16_to_cpu(smb2_command);
 314                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 315 #endif
 316                 cifs_stats_inc(&tcon->num_smbs_sent);
 317         }
 318
 319         return rc;
 320 }
 321
 322 #ifdef CONFIG_CIFS_SMB311
 323 /* offset is sizeof smb2_negotiate_req - 4 but rounded up to 8 bytes */
 324 #define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) - 4 */
 325
 326
 327 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
 328 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
 329
 330 static void
 331 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 332 {
 333         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 334         pneg_ctxt->DataLength = cpu_to_le16(38);
 335         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 336         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 337         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 338         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 339 }
 340
 341 static void
 342 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 343 {
 344         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 345         pneg_ctxt->DataLength = cpu_to_le16(6);
 346         pneg_ctxt->CipherCount = cpu_to_le16(2);
 347         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 348         pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 349 }
 350
 351 static void
 352 assemble_neg_contexts(struct smb2_negotiate_req *req)
 353 {
 354
 355         /* +4 is to account for the RFC1001 len field */
 356         char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT + 4;
 357
 358         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 359         /* Add 2 to size to round to 8 byte boundary */
 360         pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
 361         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 362         req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
 363         req->NegotiateContextCount = cpu_to_le16(2);
 364         inc_rfc1001_len(req, 4 + sizeof(struct smb2_preauth_neg_context) + 2
 365                         + sizeof(struct smb2_encryption_neg_context)); /* calculate hash */
 366 }
 367 #else
 368 static void assemble_neg_contexts(struct smb2_negotiate_req *req)
 369 {
 370         return;
 371 }
 372 #endif /* SMB311 */
 373
 374
 375 /*
 376  *
 377  *      SMB2 Worker functions follow:
 378  *
 379  *      The general structure of the worker functions is:
 380  *      1) Call smb2_init (assembles SMB2 header)
 381  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 382  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 383  *      4) Decode SMB2 command specific fields in the fixed length area
 384  *      5) Decode variable length data area (if any for this SMB2 command type)
 385  *      6) Call free smb buffer
 386  *      7) return
 387  *
 388  */
 389
 390 int
 391 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 392 {
 393         struct smb2_negotiate_req *req;
 394         struct smb2_negotiate_rsp *rsp;
 395         struct kvec iov[1];
 396         int rc = 0;
 397         int resp_buftype;
 398         struct TCP_Server_Info *server = ses->server;
 399         int blob_offset, blob_length;
 400         char *security_blob;
 401         int flags = CIFS_NEG_OP;
 402
 403         cifs_dbg(FYI, "Negotiate protocol\n");
 404
 405         if (!server) {
 406                 WARN(1, "%s: server is NULL!\n", __func__);
 407                 return -EIO;
 408         }
 409
 410         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 411         if (rc)
 412                 return rc;
 413
 414         req->hdr.SessionId = 0;
 415
 416         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 417
 418         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
 419         inc_rfc1001_len(req, 2);
 420
 421         /* only one of SMB2 signing flags may be set in SMB2 request */
 422         if (ses->sign)
 423                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 424         else if (global_secflags & CIFSSEC_MAY_SIGN)
 425                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 426         else
 427                 req->SecurityMode = 0;
 428
 429         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 430
 431         /* ClientGUID must be zero for SMB2.02 dialect */
 432         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 433                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 434         else {
 435                 memcpy(req->ClientGUID, server->client_guid,
 436                         SMB2_CLIENT_GUID_SIZE);
 437                 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
 438                         assemble_neg_contexts(req);
 439         }
 440         iov[0].iov_base = (char *)req;
 441         /* 4 for rfc1002 length field */
 442         iov[0].iov_len = get_rfc1002_length(req) + 4;
 443
 444         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 445
 446         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 447         /*
 448          * No tcon so can't do
 449          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 450          */
 451         if (rc != 0)
 452                 goto neg_exit;
 453
 454         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 455
 456         /* BB we may eventually want to match the negotiated vs. requested
 457            dialect, even though we are only requesting one at a time */
 458         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 459                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 460         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 461                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 462         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 463                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 464         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 465                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 466 #ifdef CONFIG_CIFS_SMB311
 467         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 468                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 469 #endif /* SMB311 */
 470         else {
 471                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 472                          le16_to_cpu(rsp->DialectRevision));
 473                 rc = -EIO;
 474                 goto neg_exit;
 475         }
 476         server->dialect = le16_to_cpu(rsp->DialectRevision);
 477
 478         /* SMB2 only has an extended negflavor */
 479         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 480         /* set it to the maximum buffer size value we can send with 1 credit */
 481         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 482                                SMB2_MAX_BUFFER_SIZE);
 483         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 484         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 485         /* BB Do we need to validate the SecurityMode? */
 486         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 487         server->capabilities = le32_to_cpu(rsp->Capabilities);
 488         /* Internal types */
 489         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 490
 491         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 492                                                &rsp->hdr);
 493         /*
 494          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 495          * for us will be
 496          *      ses->sectype = RawNTLMSSP;
 497          * but for time being this is our only auth choice so doesn't matter.
 498          * We just found a server which sets blob length to zero expecting raw.
 499          */
 500         if (blob_length == 0)
 501                 cifs_dbg(FYI, "missing security blob on negprot\n");
 502
 503         rc = cifs_enable_signing(server, ses->sign);
 504         if (rc)
 505                 goto neg_exit;
 506         if (blob_length) {
 507                 rc = decode_negTokenInit(security_blob, blob_length, server);
 508                 if (rc == 1)
 509                         rc = 0;
 510                 else if (rc == 0)
 511                         rc = -EIO;
 512         }
 513 neg_exit:
 514         free_rsp_buf(resp_buftype, rsp);
 515         return rc;
 516 }
 517
 518 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 519 {
 520         int rc = 0;
 521         struct validate_negotiate_info_req vneg_inbuf;
 522         struct validate_negotiate_info_rsp *pneg_rsp;
 523         u32 rsplen;
 524
 525         cifs_dbg(FYI, "validate negotiate\n");
 526
 527         /*
 528          * validation ioctl must be signed, so no point sending this if we
 529          * can not sign it.  We could eventually change this to selectively
 530          * sign just this, the first and only signed request on a connection.
 531          * This is good enough for now since a user who wants better security
 532          * would also enable signing on the mount. Having validation of
 533          * negotiate info for signed connections helps reduce attack vectors
 534          */
 535         if (tcon->ses->server->sign == false)
 536                 return 0; /* validation requires signing */
 537
 538         vneg_inbuf.Capabilities =
 539                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 540         memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
 541                                         SMB2_CLIENT_GUID_SIZE);
 542
 543         if (tcon->ses->sign)
 544                 vneg_inbuf.SecurityMode =
 545                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 546         else if (global_secflags & CIFSSEC_MAY_SIGN)
 547                 vneg_inbuf.SecurityMode =
 548                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 549         else
 550                 vneg_inbuf.SecurityMode = 0;
 551
 552         vneg_inbuf.DialectCount = cpu_to_le16(1);
 553         vneg_inbuf.Dialects[0] =
 554                 cpu_to_le16(tcon->ses->server->vals->protocol_id);
 555
 556         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 557                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 558                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
 559                 (char **)&pneg_rsp, &rsplen);
 560
 561         if (rc != 0) {
 562                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 563                 return -EIO;
 564         }
 565
 566         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
 567                 cifs_dbg(VFS, "invalid size of protocol negotiate response\n");
 568                 return -EIO;
 569         }
 570
 571         /* check validate negotiate info response matches what we got earlier */
 572         if (pneg_rsp->Dialect !=
 573                         cpu_to_le16(tcon->ses->server->vals->protocol_id))
 574                 goto vneg_out;
 575
 576         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 577                 goto vneg_out;
 578
 579         /* do not validate server guid because not saved at negprot time yet */
 580
 581         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 582               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 583                 goto vneg_out;
 584
 585         /* validate negotiate successful */
 586         cifs_dbg(FYI, "validate negotiate info successful\n");
 587         return 0;
 588
 589 vneg_out:
 590         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 591         return -EIO;
 592 }
 593
 594 int
 595 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 596                 const struct nls_table *nls_cp)
 597 {
 598         struct smb2_sess_setup_req *req;
 599         struct smb2_sess_setup_rsp *rsp = NULL;
 600         struct kvec iov[2];
 601         int rc = 0;
 602         int resp_buftype = CIFS_NO_BUFFER;
 603         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 604         struct TCP_Server_Info *server = ses->server;
 605         u16 blob_length = 0;
 606         struct key *spnego_key = NULL;
 607         char *security_blob = NULL;
 608         unsigned char *ntlmssp_blob = NULL;
 609         bool use_spnego = false; /* else use raw ntlmssp */
 610         u64 previous_session = ses->Suid;
 611
 612         cifs_dbg(FYI, "Session Setup\n");
 613
 614         if (!server) {
 615                 WARN(1, "%s: server is NULL!\n", __func__);
 616                 return -EIO;
 617         }
 618
 619         /*
 620          * If we are here due to reconnect, free per-smb session key
 621          * in case signing was required.
 622          */
 623         kfree(ses->auth_key.response);
 624         ses->auth_key.response = NULL;
 625
 626         /*
 627          * If memory allocation is successful, caller of this function
 628          * frees it.
 629          */
 630         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 631         if (!ses->ntlmssp)
 632                 return -ENOMEM;
 633         ses->ntlmssp->sesskey_per_smbsess = true;
 634
 635         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
 636         if (ses->sectype != Kerberos && ses->sectype != RawNTLMSSP)
 637                 ses->sectype = RawNTLMSSP;
 638
 639 ssetup_ntlmssp_authenticate:
 640         if (phase == NtLmChallenge)
 641                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 642
 643         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 644         if (rc)
 645                 return rc;
 646
 647         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 648
 649         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
 650         req->PreviousSessionId = previous_session;
 651
 652         req->Flags = 0; /* MBZ */
 653         /* to enable echos and oplocks */
 654         req->hdr.CreditRequest = cpu_to_le16(3);
 655
 656         /* only one of SMB2 signing flags may be set in SMB2 request */
 657         if (server->sign)
 658                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 659         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 660                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 661         else
 662                 req->SecurityMode = 0;
 663
 664         req->Capabilities = 0;
 665         req->Channel = 0; /* MBZ */
 666
 667         iov[0].iov_base = (char *)req;
 668         /* 4 for rfc1002 length field and 1 for pad */
 669         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 670
 671         if (ses->sectype == Kerberos) {
 672 #ifdef CONFIG_CIFS_UPCALL
 673                 struct cifs_spnego_msg *msg;
 674
 675                 spnego_key = cifs_get_spnego_key(ses);
 676                 if (IS_ERR(spnego_key)) {
 677                         rc = PTR_ERR(spnego_key);
 678                         spnego_key = NULL;
 679                         goto ssetup_exit;
 680                 }
 681
 682                 msg = spnego_key->payload.data[0];
 683                 /*
 684                  * check version field to make sure that cifs.upcall is
 685                  * sending us a response in an expected form
 686                  */
 687                 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
 688                         cifs_dbg(VFS,
 689                                   "bad cifs.upcall version. Expected %d got %d",
 690                                   CIFS_SPNEGO_UPCALL_VERSION, msg->version);
 691                         rc = -EKEYREJECTED;
 692                         goto ssetup_exit;
 693                 }
 694                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
 695                                                  GFP_KERNEL);
 696                 if (!ses->auth_key.response) {
 697                         cifs_dbg(VFS,
 698                                 "Kerberos can't allocate (%u bytes) memory",
 699                                 msg->sesskey_len);
 700                         rc = -ENOMEM;
 701                         goto ssetup_exit;
 702                 }
 703                 ses->auth_key.len = msg->sesskey_len;
 704                 blob_length = msg->secblob_len;
 705                 iov[1].iov_base = msg->data + msg->sesskey_len;
 706                 iov[1].iov_len = blob_length;
 707 #else
 708                 rc = -EOPNOTSUPP;
 709                 goto ssetup_exit;
 710 #endif /* CONFIG_CIFS_UPCALL */
 711         } else if (phase == NtLmNegotiate) { /* if not krb5 must be ntlmssp */
 712                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 713                                        GFP_KERNEL);
 714                 if (ntlmssp_blob == NULL) {
 715                         rc = -ENOMEM;
 716                         goto ssetup_exit;
 717                 }
 718                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 719                 if (use_spnego) {
 720                         /* blob_length = build_spnego_ntlmssp_blob(
 721                                         &security_blob,
 722                                         sizeof(struct _NEGOTIATE_MESSAGE),
 723                                         ntlmssp_blob); */
 724                         /* BB eventually need to add this */
 725                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 726                         rc = -EOPNOTSUPP;
 727                         kfree(ntlmssp_blob);
 728                         goto ssetup_exit;
 729                 } else {
 730                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 731                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 732                         security_blob = ntlmssp_blob;
 733                 }
 734                 iov[1].iov_base = security_blob;
 735                 iov[1].iov_len = blob_length;
 736         } else if (phase == NtLmAuthenticate) {
 737                 req->hdr.SessionId = ses->Suid;
 738                 rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
 739                                              nls_cp);
 740                 if (rc) {
 741                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
 742                                  rc);
 743                         goto ssetup_exit; /* BB double check error handling */
 744                 }
 745                 if (use_spnego) {
 746                         /* blob_length = build_spnego_ntlmssp_blob(
 747                                                         &security_blob,
 748                                                         blob_length,
 749                                                         ntlmssp_blob); */
 750                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 751                         rc = -EOPNOTSUPP;
 752                         kfree(ntlmssp_blob);
 753                         goto ssetup_exit;
 754                 } else {
 755                         security_blob = ntlmssp_blob;
 756                 }
 757                 iov[1].iov_base = security_blob;
 758                 iov[1].iov_len = blob_length;
 759         } else {
 760                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
 761                 rc = -EIO;
 762                 goto ssetup_exit;
 763         }
 764
 765         /* Testing shows that buffer offset must be at location of Buffer[0] */
 766         req->SecurityBufferOffset =
 767                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 768                                             1 /* pad */ - 4 /* rfc1001 len */);
 769         req->SecurityBufferLength = cpu_to_le16(blob_length);
 770
 771         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 772
 773         /* BB add code to build os and lm fields */
 774
 775         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 776                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 777
 778         kfree(security_blob);
 779         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 780         ses->Suid = rsp->hdr.SessionId;
 781         if (resp_buftype != CIFS_NO_BUFFER &&
 782             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 783                 if (phase != NtLmNegotiate) {
 784                         cifs_dbg(VFS, "Unexpected more processing error\n");
 785                         goto ssetup_exit;
 786                 }
 787                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 788                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 789                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 790                                  le16_to_cpu(rsp->SecurityBufferOffset));
 791                         rc = -EIO;
 792                         goto ssetup_exit;
 793                 }
 794
 795                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 796                 phase = NtLmChallenge; /* process ntlmssp challenge */
 797                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 798                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 799                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 800         }
 801
 802         /*
 803          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 804          * but at least the raw NTLMSSP case works.
 805          */
 806         /*
 807          * No tcon so can't do
 808          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 809          */
 810         if (rc != 0)
 811                 goto ssetup_exit;
 812
 813         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 814         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
 815                 cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
 816 ssetup_exit:
 817         free_rsp_buf(resp_buftype, rsp);
 818
 819         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 820         if ((phase == NtLmChallenge) && (rc == 0))
 821                 goto ssetup_ntlmssp_authenticate;
 822
 823         if (!rc) {
 824                 mutex_lock(&server->srv_mutex);
 825                 if (server->sign && server->ops->generate_signingkey) {
 826                         rc = server->ops->generate_signingkey(ses);
 827                         kfree(ses->auth_key.response);
 828                         ses->auth_key.response = NULL;
 829                         if (rc) {
 830                                 cifs_dbg(FYI,
 831                                         "SMB3 session key generation failed\n");
 832                                 mutex_unlock(&server->srv_mutex);
 833                                 goto keygen_exit;
 834                         }
 835                 }
 836                 if (!server->session_estab) {
 837                         server->sequence_number = 0x2;
 838                         server->session_estab = true;
 839                 }
 840                 mutex_unlock(&server->srv_mutex);
 841
 842                 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 843                 spin_lock(&GlobalMid_Lock);
 844                 ses->status = CifsGood;
 845                 ses->need_reconnect = false;
 846                 spin_unlock(&GlobalMid_Lock);
 847         }
 848
 849 keygen_exit:
 850         if (!server->sign) {
 851                 kfree(ses->auth_key.response);
 852                 ses->auth_key.response = NULL;
 853         }
 854         if (spnego_key) {
 855                 key_invalidate(spnego_key);
 856                 key_put(spnego_key);
 857         }
 858         kfree(ses->ntlmssp);
 859
 860         return rc;
 861 }
 862
 863 int
 864 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 865 {
 866         struct smb2_logoff_req *req; /* response is also trivial struct */
 867         int rc = 0;
 868         struct TCP_Server_Info *server;
 869
 870         cifs_dbg(FYI, "disconnect session %p\n", ses);
 871
 872         if (ses && (ses->server))
 873                 server = ses->server;
 874         else
 875                 return -EIO;
 876
 877         /* no need to send SMB logoff if uid already closed due to reconnect */
 878         if (ses->need_reconnect)
 879                 goto smb2_session_already_dead;
 880
 881         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 882         if (rc)
 883                 return rc;
 884
 885          /* since no tcon, smb2_init can not do this, so do here */
 886         req->hdr.SessionId = ses->Suid;
 887         if (server->sign)
 888                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 889
 890         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 891         /*
 892          * No tcon so can't do
 893          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 894          */
 895
 896 smb2_session_already_dead:
 897         return rc;
 898 }
 899
 900 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 901 {
 902         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 903 }
 904
 905 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 906
 907 /* These are similar values to what Windows uses */
 908 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
 909 {
 910         tcon->max_chunks = 256;
 911         tcon->max_bytes_chunk = 1048576;
 912         tcon->max_bytes_copy = 16777216;
 913 }
 914
 915 int
 916 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 917           struct cifs_tcon *tcon, const struct nls_table *cp)
 918 {
 919         struct smb2_tree_connect_req *req;
 920         struct smb2_tree_connect_rsp *rsp = NULL;
 921         struct kvec iov[2];
 922         int rc = 0;
 923         int resp_buftype;
 924         int unc_path_len;
 925         struct TCP_Server_Info *server;
 926         __le16 *unc_path = NULL;
 927
 928         cifs_dbg(FYI, "TCON\n");
 929
 930         if ((ses->server) && tree)
 931                 server = ses->server;
 932         else
 933                 return -EIO;
 934
 935         if (tcon && tcon->bad_network_name)
 936                 return -ENOENT;
 937
 938         if ((tcon && tcon->seal) &&
 939             ((ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION) == 0)) {
 940                 cifs_dbg(VFS, "encryption requested but no server support");
 941                 return -EOPNOTSUPP;
 942         }
 943
 944         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 945         if (unc_path == NULL)
 946                 return -ENOMEM;
 947
 948         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 949         unc_path_len *= 2;
 950         if (unc_path_len < 2) {
 951                 kfree(unc_path);
 952                 return -EINVAL;
 953         }
 954
 955         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 956         if (rc) {
 957                 kfree(unc_path);
 958                 return rc;
 959         }
 960
 961         if (tcon == NULL) {
 962                 /* since no tcon, smb2_init can not do this, so do here */
 963                 req->hdr.SessionId = ses->Suid;
 964                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 965                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 966         }
 967
 968         iov[0].iov_base = (char *)req;
 969         /* 4 for rfc1002 length field and 1 for pad */
 970         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 971
 972         /* Testing shows that buffer offset must be at location of Buffer[0] */
 973         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 974                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 975         req->PathLength = cpu_to_le16(unc_path_len - 2);
 976         iov[1].iov_base = unc_path;
 977         iov[1].iov_len = unc_path_len;
 978
 979         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 980
 981         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 982         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 983
 984         if (rc != 0) {
 985                 if (tcon) {
 986                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 987                         tcon->need_reconnect = true;
 988                 }
 989                 goto tcon_error_exit;
 990         }
 991
 992         if (tcon == NULL) {
 993                 ses->ipc_tid = rsp->hdr.TreeId;
 994                 goto tcon_exit;
 995         }
 996
 997         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 998                 cifs_dbg(FYI, "connection to disk share\n");
 999         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
1000                 tcon->ipc = true;
1001                 cifs_dbg(FYI, "connection to pipe share\n");
1002         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
1003                 tcon->print = true;
1004                 cifs_dbg(FYI, "connection to printer\n");
1005         } else {
1006                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1007                 rc = -EOPNOTSUPP;
1008                 goto tcon_error_exit;
1009         }
1010
1011         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1012         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1013         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1014         tcon->tidStatus = CifsGood;
1015         tcon->need_reconnect = false;
1016         tcon->tid = rsp->hdr.TreeId;
1017         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1018
1019         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1020             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1021                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1022         init_copy_chunk_defaults(tcon);
1023         if (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA)
1024                 cifs_dbg(VFS, "Encrypted shares not supported");
1025         if (tcon->ses->server->ops->validate_negotiate)
1026                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1027 tcon_exit:
1028         free_rsp_buf(resp_buftype, rsp);
1029         kfree(unc_path);
1030         return rc;
1031
1032 tcon_error_exit:
1033         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
1034                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1035                 if (tcon)
1036                         tcon->bad_network_name = true;
1037         }
1038         goto tcon_exit;
1039 }
1040
1041 int
1042 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1043 {
1044         struct smb2_tree_disconnect_req *req; /* response is trivial */
1045         int rc = 0;
1046         struct TCP_Server_Info *server;
1047         struct cifs_ses *ses = tcon->ses;
1048
1049         cifs_dbg(FYI, "Tree Disconnect\n");
1050
1051         if (ses && (ses->server))
1052                 server = ses->server;
1053         else
1054                 return -EIO;
1055
1056         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1057                 return 0;
1058
1059         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
1060         if (rc)
1061                 return rc;
1062
1063         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
1064         if (rc)
1065                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1066
1067         return rc;
1068 }
1069
1070
1071 static struct create_durable *
1072 create_durable_buf(void)
1073 {
1074         struct create_durable *buf;
1075
1076         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1077         if (!buf)
1078                 return NULL;
1079
1080         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1081                                         (struct create_durable, Data));
1082         buf->ccontext.DataLength = cpu_to_le32(16);
1083         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1084                                 (struct create_durable, Name));
1085         buf->ccontext.NameLength = cpu_to_le16(4);
1086         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1087         buf->Name[0] = 'D';
1088         buf->Name[1] = 'H';
1089         buf->Name[2] = 'n';
1090         buf->Name[3] = 'Q';
1091         return buf;
1092 }
1093
1094 static struct create_durable *
1095 create_reconnect_durable_buf(struct cifs_fid *fid)
1096 {
1097         struct create_durable *buf;
1098
1099         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1100         if (!buf)
1101                 return NULL;
1102
1103         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1104                                         (struct create_durable, Data));
1105         buf->ccontext.DataLength = cpu_to_le32(16);
1106         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1107                                 (struct create_durable, Name));
1108         buf->ccontext.NameLength = cpu_to_le16(4);
1109         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1110         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1111         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1112         buf->Name[0] = 'D';
1113         buf->Name[1] = 'H';
1114         buf->Name[2] = 'n';
1115         buf->Name[3] = 'C';
1116         return buf;
1117 }
1118
1119 static __u8
1120 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1121                   unsigned int *epoch)
1122 {
1123         char *data_offset;
1124         struct create_context *cc;
1125         unsigned int next;
1126         unsigned int remaining;
1127         char *name;
1128
1129         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1130         remaining = le32_to_cpu(rsp->CreateContextsLength);
1131         cc = (struct create_context *)data_offset;
1132         while (remaining >= sizeof(struct create_context)) {
1133                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1134                 if (le16_to_cpu(cc->NameLength) == 4 &&
1135                     strncmp(name, "RqLs", 4) == 0)
1136                         return server->ops->parse_lease_buf(cc, epoch);
1137
1138                 next = le32_to_cpu(cc->Next);
1139                 if (!next)
1140                         break;
1141                 remaining -= next;
1142                 cc = (struct create_context *)((char *)cc + next);
1143         }
1144
1145         return 0;
1146 }
1147
1148 static int
1149 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1150                   unsigned int *num_iovec, __u8 *oplock)
1151 {
1152         struct smb2_create_req *req = iov[0].iov_base;
1153         unsigned int num = *num_iovec;
1154
1155         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1156         if (iov[num].iov_base == NULL)
1157                 return -ENOMEM;
1158         iov[num].iov_len = server->vals->create_lease_size;
1159         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1160         if (!req->CreateContextsOffset)
1161                 req->CreateContextsOffset = cpu_to_le32(
1162                                 sizeof(struct smb2_create_req) - 4 +
1163                                 iov[num - 1].iov_len);
1164         le32_add_cpu(&req->CreateContextsLength,
1165                      server->vals->create_lease_size);
1166         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1167         *num_iovec = num + 1;
1168         return 0;
1169 }
1170
1171 static struct create_durable_v2 *
1172 create_durable_v2_buf(struct cifs_fid *pfid)
1173 {
1174         struct create_durable_v2 *buf;
1175
1176         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1177         if (!buf)
1178                 return NULL;
1179
1180         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1181                                         (struct create_durable_v2, dcontext));
1182         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1183         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1184                                 (struct create_durable_v2, Name));
1185         buf->ccontext.NameLength = cpu_to_le16(4);
1186
1187         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1188         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1189         generate_random_uuid(buf->dcontext.CreateGuid);
1190         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1191
1192         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1193         buf->Name[0] = 'D';
1194         buf->Name[1] = 'H';
1195         buf->Name[2] = '2';
1196         buf->Name[3] = 'Q';
1197         return buf;
1198 }
1199
1200 static struct create_durable_handle_reconnect_v2 *
1201 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1202 {
1203         struct create_durable_handle_reconnect_v2 *buf;
1204
1205         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1206                         GFP_KERNEL);
1207         if (!buf)
1208                 return NULL;
1209
1210         buf->ccontext.DataOffset =
1211                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1212                                      dcontext));
1213         buf->ccontext.DataLength =
1214                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1215         buf->ccontext.NameOffset =
1216                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1217                             Name));
1218         buf->ccontext.NameLength = cpu_to_le16(4);
1219
1220         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1221         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1222         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1223         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1224
1225         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1226         buf->Name[0] = 'D';
1227         buf->Name[1] = 'H';
1228         buf->Name[2] = '2';
1229         buf->Name[3] = 'C';
1230         return buf;
1231 }
1232
1233 static int
1234 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1235                     struct cifs_open_parms *oparms)
1236 {
1237         struct smb2_create_req *req = iov[0].iov_base;
1238         unsigned int num = *num_iovec;
1239
1240         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1241         if (iov[num].iov_base == NULL)
1242                 return -ENOMEM;
1243         iov[num].iov_len = sizeof(struct create_durable_v2);
1244         if (!req->CreateContextsOffset)
1245                 req->CreateContextsOffset =
1246                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1247                                                                 iov[1].iov_len);
1248         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1249         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable_v2));
1250         *num_iovec = num + 1;
1251         return 0;
1252 }
1253
1254 static int
1255 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1256                     struct cifs_open_parms *oparms)
1257 {
1258         struct smb2_create_req *req = iov[0].iov_base;
1259         unsigned int num = *num_iovec;
1260
1261         /* indicate that we don't need to relock the file */
1262         oparms->reconnect = false;
1263
1264         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1265         if (iov[num].iov_base == NULL)
1266                 return -ENOMEM;
1267         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1268         if (!req->CreateContextsOffset)
1269                 req->CreateContextsOffset =
1270                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1271                                                                 iov[1].iov_len);
1272         le32_add_cpu(&req->CreateContextsLength,
1273                         sizeof(struct create_durable_handle_reconnect_v2));
1274         inc_rfc1001_len(&req->hdr,
1275                         sizeof(struct create_durable_handle_reconnect_v2));
1276         *num_iovec = num + 1;
1277         return 0;
1278 }
1279
1280 static int
1281 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1282                     struct cifs_open_parms *oparms, bool use_persistent)
1283 {
1284         struct smb2_create_req *req = iov[0].iov_base;
1285         unsigned int num = *num_iovec;
1286
1287         if (use_persistent) {
1288                 if (oparms->reconnect)
1289                         return add_durable_reconnect_v2_context(iov, num_iovec,
1290                                                                 oparms);
1291                 else
1292                         return add_durable_v2_context(iov, num_iovec, oparms);
1293         }
1294
1295         if (oparms->reconnect) {
1296                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1297                 /* indicate that we don't need to relock the file */
1298                 oparms->reconnect = false;
1299         } else
1300                 iov[num].iov_base = create_durable_buf();
1301         if (iov[num].iov_base == NULL)
1302                 return -ENOMEM;
1303         iov[num].iov_len = sizeof(struct create_durable);
1304         if (!req->CreateContextsOffset)
1305                 req->CreateContextsOffset =
1306                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1307                                                                 iov[1].iov_len);
1308         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1309         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1310         *num_iovec = num + 1;
1311         return 0;
1312 }
1313
1314 int
1315 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1316           __u8 *oplock, struct smb2_file_all_info *buf,
1317           struct smb2_err_rsp **err_buf)
1318 {
1319         struct smb2_create_req *req;
1320         struct smb2_create_rsp *rsp;
1321         struct TCP_Server_Info *server;
1322         struct cifs_tcon *tcon = oparms->tcon;
1323         struct cifs_ses *ses = tcon->ses;
1324         struct kvec iov[4];
1325         int resp_buftype;
1326         int uni_path_len;
1327         __le16 *copy_path = NULL;
1328         int copy_size;
1329         int rc = 0;
1330         unsigned int num_iovecs = 2;
1331         __u32 file_attributes = 0;
1332         char *dhc_buf = NULL, *lc_buf = NULL;
1333
1334         cifs_dbg(FYI, "create/open\n");
1335
1336         if (ses && (ses->server))
1337                 server = ses->server;
1338         else
1339                 return -EIO;
1340
1341         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1342         if (rc)
1343                 return rc;
1344
1345         if (oparms->create_options & CREATE_OPTION_READONLY)
1346                 file_attributes |= ATTR_READONLY;
1347         if (oparms->create_options & CREATE_OPTION_SPECIAL)
1348                 file_attributes |= ATTR_SYSTEM;
1349
1350         req->ImpersonationLevel = IL_IMPERSONATION;
1351         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1352         /* File attributes ignored on open (used in create though) */
1353         req->FileAttributes = cpu_to_le32(file_attributes);
1354         req->ShareAccess = FILE_SHARE_ALL_LE;
1355         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1356         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1357         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1358         /* do not count rfc1001 len field */
1359         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1360
1361         iov[0].iov_base = (char *)req;
1362         /* 4 for rfc1002 length field */
1363         iov[0].iov_len = get_rfc1002_length(req) + 4;
1364
1365         /* MUST set path len (NameLength) to 0 opening root of share */
1366         req->NameLength = cpu_to_le16(uni_path_len - 2);
1367         /* -1 since last byte is buf[0] which is sent below (path) */
1368         iov[0].iov_len--;
1369         if (uni_path_len % 8 != 0) {
1370                 copy_size = uni_path_len / 8 * 8;
1371                 if (copy_size < uni_path_len)
1372                         copy_size += 8;
1373
1374                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1375                 if (!copy_path)
1376                         return -ENOMEM;
1377                 memcpy((char *)copy_path, (const char *)path,
1378                         uni_path_len);
1379                 uni_path_len = copy_size;
1380                 path = copy_path;
1381         }
1382
1383         iov[1].iov_len = uni_path_len;
1384         iov[1].iov_base = path;
1385         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1386         inc_rfc1001_len(req, uni_path_len - 1);
1387
1388         if (!server->oplocks)
1389                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1390
1391         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1392             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1393                 req->RequestedOplockLevel = *oplock;
1394         else {
1395                 rc = add_lease_context(server, iov, &num_iovecs, oplock);
1396                 if (rc) {
1397                         cifs_small_buf_release(req);
1398                         kfree(copy_path);
1399                         return rc;
1400                 }
1401                 lc_buf = iov[num_iovecs-1].iov_base;
1402         }
1403
1404         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1405                 /* need to set Next field of lease context if we request it */
1406                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1407                         struct create_context *ccontext =
1408                             (struct create_context *)iov[num_iovecs-1].iov_base;
1409                         ccontext->Next =
1410                                 cpu_to_le32(server->vals->create_lease_size);
1411                 }
1412
1413                 rc = add_durable_context(iov, &num_iovecs, oparms,
1414                                         tcon->use_persistent);
1415                 if (rc) {
1416                         cifs_small_buf_release(req);
1417                         kfree(copy_path);
1418                         kfree(lc_buf);
1419                         return rc;
1420                 }
1421                 dhc_buf = iov[num_iovecs-1].iov_base;
1422         }
1423
1424         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1425         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1426
1427         if (rc != 0) {
1428                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1429                 if (err_buf)
1430                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1431                                            GFP_KERNEL);
1432                 goto creat_exit;
1433         }
1434
1435         oparms->fid->persistent_fid = rsp->PersistentFileId;
1436         oparms->fid->volatile_fid = rsp->VolatileFileId;
1437
1438         if (buf) {
1439                 memcpy(buf, &rsp->CreationTime, 32);
1440                 buf->AllocationSize = rsp->AllocationSize;
1441                 buf->EndOfFile = rsp->EndofFile;
1442                 buf->Attributes = rsp->FileAttributes;
1443                 buf->NumberOfLinks = cpu_to_le32(1);
1444                 buf->DeletePending = 0;
1445         }
1446
1447         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1448                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1449         else
1450                 *oplock = rsp->OplockLevel;
1451 creat_exit:
1452         kfree(copy_path);
1453         kfree(lc_buf);
1454         kfree(dhc_buf);
1455         free_rsp_buf(resp_buftype, rsp);
1456         return rc;
1457 }
1458
1459 /*
1460  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1461  */
1462 int
1463 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1464            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1465            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1466 {
1467         struct smb2_ioctl_req *req;
1468         struct smb2_ioctl_rsp *rsp;
1469         struct TCP_Server_Info *server;
1470         struct cifs_ses *ses;
1471         struct kvec iov[2];
1472         int resp_buftype;
1473         int num_iovecs;
1474         int rc = 0;
1475
1476         cifs_dbg(FYI, "SMB2 IOCTL\n");
1477
1478         if (out_data != NULL)
1479                 *out_data = NULL;
1480
1481         /* zero out returned data len, in case of error */
1482         if (plen)
1483                 *plen = 0;
1484
1485         if (tcon)
1486                 ses = tcon->ses;
1487         else
1488                 return -EIO;
1489
1490         if (ses && (ses->server))
1491                 server = ses->server;
1492         else
1493                 return -EIO;
1494
1495         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1496         if (rc)
1497                 return rc;
1498
1499         req->CtlCode = cpu_to_le32(opcode);
1500         req->PersistentFileId = persistent_fid;
1501         req->VolatileFileId = volatile_fid;
1502
1503         if (indatalen) {
1504                 req->InputCount = cpu_to_le32(indatalen);
1505                 /* do not set InputOffset if no input data */
1506                 req->InputOffset =
1507                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1508                 iov[1].iov_base = in_data;
1509                 iov[1].iov_len = indatalen;
1510                 num_iovecs = 2;
1511         } else
1512                 num_iovecs = 1;
1513
1514         req->OutputOffset = 0;
1515         req->OutputCount = 0; /* MBZ */
1516
1517         /*
1518          * Could increase MaxOutputResponse, but that would require more
1519          * than one credit. Windows typically sets this smaller, but for some
1520          * ioctls it may be useful to allow server to send more. No point
1521          * limiting what the server can send as long as fits in one credit
1522          */
1523         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1524
1525         if (is_fsctl)
1526                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1527         else
1528                 req->Flags = 0;
1529
1530         iov[0].iov_base = (char *)req;
1531
1532         /*
1533          * If no input data, the size of ioctl struct in
1534          * protocol spec still includes a 1 byte data buffer,
1535          * but if input data passed to ioctl, we do not
1536          * want to double count this, so we do not send
1537          * the dummy one byte of data in iovec[0] if sending
1538          * input data (in iovec[1]). We also must add 4 bytes
1539          * in first iovec to allow for rfc1002 length field.
1540          */
1541
1542         if (indatalen) {
1543                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1544                 inc_rfc1001_len(req, indatalen - 1);
1545         } else
1546                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1547
1548
1549         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1550         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1551
1552         if ((rc != 0) && (rc != -EINVAL)) {
1553                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1554                 goto ioctl_exit;
1555         } else if (rc == -EINVAL) {
1556                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1557                     (opcode != FSCTL_SRV_COPYCHUNK)) {
1558                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1559                         goto ioctl_exit;
1560                 }
1561         }
1562
1563         /* check if caller wants to look at return data or just return rc */
1564         if ((plen == NULL) || (out_data == NULL))
1565                 goto ioctl_exit;
1566
1567         *plen = le32_to_cpu(rsp->OutputCount);
1568
1569         /* We check for obvious errors in the output buffer length and offset */
1570         if (*plen == 0)
1571                 goto ioctl_exit; /* server returned no data */
1572         else if (*plen > 0xFF00) {
1573                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1574                 *plen = 0;
1575                 rc = -EIO;
1576                 goto ioctl_exit;
1577         }
1578
1579         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1580                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1581                         le32_to_cpu(rsp->OutputOffset));
1582                 *plen = 0;
1583                 rc = -EIO;
1584                 goto ioctl_exit;
1585         }
1586
1587         *out_data = kmalloc(*plen, GFP_KERNEL);
1588         if (*out_data == NULL) {
1589                 rc = -ENOMEM;
1590                 goto ioctl_exit;
1591         }
1592
1593         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1594                *plen);
1595 ioctl_exit:
1596         free_rsp_buf(resp_buftype, rsp);
1597         return rc;
1598 }
1599
1600 /*
1601  *   Individual callers to ioctl worker function follow
1602  */
1603
1604 int
1605 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1606                      u64 persistent_fid, u64 volatile_fid)
1607 {
1608         int rc;
1609         struct  compress_ioctl fsctl_input;
1610         char *ret_data = NULL;
1611
1612         fsctl_input.CompressionState =
1613                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1614
1615         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1616                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1617                         (char *)&fsctl_input /* data input */,
1618                         2 /* in data len */, &ret_data /* out data */, NULL);
1619
1620         cifs_dbg(FYI, "set compression rc %d\n", rc);
1621
1622         return rc;
1623 }
1624
1625 int
1626 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1627            u64 persistent_fid, u64 volatile_fid)
1628 {
1629         struct smb2_close_req *req;
1630         struct smb2_close_rsp *rsp;
1631         struct TCP_Server_Info *server;
1632         struct cifs_ses *ses = tcon->ses;
1633         struct kvec iov[1];
1634         int resp_buftype;
1635         int rc = 0;
1636
1637         cifs_dbg(FYI, "Close\n");
1638
1639         if (ses && (ses->server))
1640                 server = ses->server;
1641         else
1642                 return -EIO;
1643
1644         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1645         if (rc)
1646                 return rc;
1647
1648         req->PersistentFileId = persistent_fid;
1649         req->VolatileFileId = volatile_fid;
1650
1651         iov[0].iov_base = (char *)req;
1652         /* 4 for rfc1002 length field */
1653         iov[0].iov_len = get_rfc1002_length(req) + 4;
1654
1655         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1656         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1657
1658         if (rc != 0) {
1659                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1660                 goto close_exit;
1661         }
1662
1663         /* BB FIXME - decode close response, update inode for caching */
1664
1665 close_exit:
1666         free_rsp_buf(resp_buftype, rsp);
1667         return rc;
1668 }
1669
1670 static int
1671 validate_buf(unsigned int offset, unsigned int buffer_length,
1672              struct smb2_hdr *hdr, unsigned int min_buf_size)
1673
1674 {
1675         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1676         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1677         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1678         char *end_of_buf = begin_of_buf + buffer_length;
1679
1680
1681         if (buffer_length < min_buf_size) {
1682                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1683                          buffer_length, min_buf_size);
1684                 return -EINVAL;
1685         }
1686
1687         /* check if beyond RFC1001 maximum length */
1688         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1689                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1690                          buffer_length, smb_len);
1691                 return -EINVAL;
1692         }
1693
1694         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1695                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1696                 return -EINVAL;
1697         }
1698
1699         return 0;
1700 }
1701
1702 /*
1703  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1704  * Caller must free buffer.
1705  */
1706 static int
1707 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1708                       struct smb2_hdr *hdr, unsigned int minbufsize,
1709                       char *data)
1710
1711 {
1712         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1713         int rc;
1714
1715         if (!data)
1716                 return -EINVAL;
1717
1718         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1719         if (rc)
1720                 return rc;
1721
1722         memcpy(data, begin_of_buf, buffer_length);
1723
1724         return 0;
1725 }
1726
1727 static int
1728 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1729            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1730            size_t output_len, size_t min_len, void *data)
1731 {
1732         struct smb2_query_info_req *req;
1733         struct smb2_query_info_rsp *rsp = NULL;
1734         struct kvec iov[2];
1735         int rc = 0;
1736         int resp_buftype;
1737         struct TCP_Server_Info *server;
1738         struct cifs_ses *ses = tcon->ses;
1739
1740         cifs_dbg(FYI, "Query Info\n");
1741
1742         if (ses && (ses->server))
1743                 server = ses->server;
1744         else
1745                 return -EIO;
1746
1747         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1748         if (rc)
1749                 return rc;
1750
1751         req->InfoType = SMB2_O_INFO_FILE;
1752         req->FileInfoClass = info_class;
1753         req->PersistentFileId = persistent_fid;
1754         req->VolatileFileId = volatile_fid;
1755         /* 4 for rfc1002 length field and 1 for Buffer */
1756         req->InputBufferOffset =
1757                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1758         req->OutputBufferLength = cpu_to_le32(output_len);
1759
1760         iov[0].iov_base = (char *)req;
1761         /* 4 for rfc1002 length field */
1762         iov[0].iov_len = get_rfc1002_length(req) + 4;
1763
1764         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1765         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1766
1767         if (rc) {
1768                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1769                 goto qinf_exit;
1770         }
1771
1772         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1773                                    le32_to_cpu(rsp->OutputBufferLength),
1774                                    &rsp->hdr, min_len, data);
1775
1776 qinf_exit:
1777         free_rsp_buf(resp_buftype, rsp);
1778         return rc;
1779 }
1780
1781 int
1782 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1783                 u64 persistent_fid, u64 volatile_fid,
1784                 struct smb2_file_all_info *data)
1785 {
1786         return query_info(xid, tcon, persistent_fid, volatile_fid,
1787                           FILE_ALL_INFORMATION,
1788                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
1789                           sizeof(struct smb2_file_all_info), data);
1790 }
1791
1792 int
1793 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1794                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1795 {
1796         return query_info(xid, tcon, persistent_fid, volatile_fid,
1797                           FILE_INTERNAL_INFORMATION,
1798                           sizeof(struct smb2_file_internal_info),
1799                           sizeof(struct smb2_file_internal_info), uniqueid);
1800 }
1801
1802 /*
1803  * This is a no-op for now. We're not really interested in the reply, but
1804  * rather in the fact that the server sent one and that server->lstrp
1805  * gets updated.
1806  *
1807  * FIXME: maybe we should consider checking that the reply matches request?
1808  */
1809 static void
1810 smb2_echo_callback(struct mid_q_entry *mid)
1811 {
1812         struct TCP_Server_Info *server = mid->callback_data;
1813         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1814         unsigned int credits_received = 1;
1815
1816         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1817                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1818
1819         mutex_lock(&server->srv_mutex);
1820         DeleteMidQEntry(mid);
1821         mutex_unlock(&server->srv_mutex);
1822         add_credits(server, credits_received, CIFS_ECHO_OP);
1823 }
1824
1825 int
1826 SMB2_echo(struct TCP_Server_Info *server)
1827 {
1828         struct smb2_echo_req *req;
1829         int rc = 0;
1830         struct kvec iov;
1831         struct smb_rqst rqst = { .rq_iov = &iov,
1832                                  .rq_nvec = 1 };
1833
1834         cifs_dbg(FYI, "In echo request\n");
1835
1836         if (server->tcpStatus == CifsNeedNegotiate) {
1837                 struct list_head *tmp, *tmp2;
1838                 struct cifs_ses *ses;
1839                 struct cifs_tcon *tcon;
1840
1841                 cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
1842                 spin_lock(&cifs_tcp_ses_lock);
1843                 list_for_each(tmp, &server->smb_ses_list) {
1844                         ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
1845                         list_for_each(tmp2, &ses->tcon_list) {
1846                                 tcon = list_entry(tmp2, struct cifs_tcon,
1847                                                   tcon_list);
1848                                 /* add check for persistent handle reconnect */
1849                                 if (tcon && tcon->need_reconnect) {
1850                                         spin_unlock(&cifs_tcp_ses_lock);
1851                                         rc = smb2_reconnect(SMB2_ECHO, tcon);
1852                                         spin_lock(&cifs_tcp_ses_lock);
1853                                 }
1854                         }
1855                 }
1856                 spin_unlock(&cifs_tcp_ses_lock);
1857         }
1858
1859         /* if no session, renegotiate failed above */
1860         if (server->tcpStatus == CifsNeedNegotiate)
1861                 return -EIO;
1862
1863         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1864         if (rc)
1865                 return rc;
1866
1867         req->hdr.CreditRequest = cpu_to_le16(1);
1868
1869         iov.iov_base = (char *)req;
1870         /* 4 for rfc1002 length field */
1871         iov.iov_len = get_rfc1002_length(req) + 4;
1872
1873         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1874                              CIFS_ECHO_OP);
1875         if (rc)
1876                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1877
1878         cifs_small_buf_release(req);
1879         return rc;
1880 }
1881
1882 int
1883 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1884            u64 volatile_fid)
1885 {
1886         struct smb2_flush_req *req;
1887         struct TCP_Server_Info *server;
1888         struct cifs_ses *ses = tcon->ses;
1889         struct kvec iov[1];
1890         int resp_buftype;
1891         int rc = 0;
1892
1893         cifs_dbg(FYI, "Flush\n");
1894
1895         if (ses && (ses->server))
1896                 server = ses->server;
1897         else
1898                 return -EIO;
1899
1900         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1901         if (rc)
1902                 return rc;
1903
1904         req->PersistentFileId = persistent_fid;
1905         req->VolatileFileId = volatile_fid;
1906
1907         iov[0].iov_base = (char *)req;
1908         /* 4 for rfc1002 length field */
1909         iov[0].iov_len = get_rfc1002_length(req) + 4;
1910
1911         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1912
1913         if (rc != 0)
1914                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1915
1916         free_rsp_buf(resp_buftype, iov[0].iov_base);
1917         return rc;
1918 }
1919
1920 /*
1921  * To form a chain of read requests, any read requests after the first should
1922  * have the end_of_chain boolean set to true.
1923  */
1924 static int
1925 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1926                   unsigned int remaining_bytes, int request_type)
1927 {
1928         int rc = -EACCES;
1929         struct smb2_read_req *req = NULL;
1930
1931         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1932         if (rc)
1933                 return rc;
1934         if (io_parms->tcon->ses->server == NULL)
1935                 return -ECONNABORTED;
1936
1937         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1938
1939         req->PersistentFileId = io_parms->persistent_fid;
1940         req->VolatileFileId = io_parms->volatile_fid;
1941         req->ReadChannelInfoOffset = 0; /* reserved */
1942         req->ReadChannelInfoLength = 0; /* reserved */
1943         req->Channel = 0; /* reserved */
1944         req->MinimumCount = 0;
1945         req->Length = cpu_to_le32(io_parms->length);
1946         req->Offset = cpu_to_le64(io_parms->offset);
1947
1948         if (request_type & CHAINED_REQUEST) {
1949                 if (!(request_type & END_OF_CHAIN)) {
1950                         /* 4 for rfc1002 length field */
1951                         req->hdr.NextCommand =
1952                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1953                 } else /* END_OF_CHAIN */
1954                         req->hdr.NextCommand = 0;
1955                 if (request_type & RELATED_REQUEST) {
1956                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1957                         /*
1958                          * Related requests use info from previous read request
1959                          * in chain.
1960                          */
1961                         req->hdr.SessionId = 0xFFFFFFFF;
1962                         req->hdr.TreeId = 0xFFFFFFFF;
1963                         req->PersistentFileId = 0xFFFFFFFF;
1964                         req->VolatileFileId = 0xFFFFFFFF;
1965                 }
1966         }
1967         if (remaining_bytes > io_parms->length)
1968                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1969         else
1970                 req->RemainingBytes = 0;
1971
1972         iov[0].iov_base = (char *)req;
1973         /* 4 for rfc1002 length field */
1974         iov[0].iov_len = get_rfc1002_length(req) + 4;
1975         return rc;
1976 }
1977
1978 static void
1979 smb2_readv_callback(struct mid_q_entry *mid)
1980 {
1981         struct cifs_readdata *rdata = mid->callback_data;
1982         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1983         struct TCP_Server_Info *server = tcon->ses->server;
1984         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1985         unsigned int credits_received = 1;
1986         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1987                                  .rq_nvec = 1,
1988                                  .rq_pages = rdata->pages,
1989                                  .rq_npages = rdata->nr_pages,
1990                                  .rq_pagesz = rdata->pagesz,
1991                                  .rq_tailsz = rdata->tailsz };
1992
1993         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1994                  __func__, mid->mid, mid->mid_state, rdata->result,
1995                  rdata->bytes);
1996
1997         switch (mid->mid_state) {
1998         case MID_RESPONSE_RECEIVED:
1999                 credits_received = le16_to_cpu(buf->CreditRequest);
2000                 /* result already set, check signature */
2001                 if (server->sign) {
2002                         int rc;
2003
2004                         rc = smb2_verify_signature(&rqst, server);
2005                         if (rc)
2006                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
2007                                          rc);
2008                 }
2009                 /* FIXME: should this be counted toward the initiating task? */
2010                 task_io_account_read(rdata->got_bytes);
2011                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2012                 break;
2013         case MID_REQUEST_SUBMITTED:
2014         case MID_RETRY_NEEDED:
2015                 rdata->result = -EAGAIN;
2016                 if (server->sign && rdata->got_bytes)
2017                         /* reset bytes number since we can not check a sign */
2018                         rdata->got_bytes = 0;
2019                 /* FIXME: should this be counted toward the initiating task? */
2020                 task_io_account_read(rdata->got_bytes);
2021                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2022                 break;
2023         default:
2024                 if (rdata->result != -ENODATA)
2025                         rdata->result = -EIO;
2026         }
2027
2028         if (rdata->result)
2029                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
2030
2031         queue_work(cifsiod_wq, &rdata->work);
2032         mutex_lock(&server->srv_mutex);
2033         DeleteMidQEntry(mid);
2034         mutex_unlock(&server->srv_mutex);
2035         add_credits(server, credits_received, 0);
2036 }
2037
2038 /* smb2_async_readv - send an async write, and set up mid to handle result */
2039 int
2040 smb2_async_readv(struct cifs_readdata *rdata)
2041 {
2042         int rc, flags = 0;
2043         struct smb2_hdr *buf;
2044         struct cifs_io_parms io_parms;
2045         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
2046                                  .rq_nvec = 1 };
2047         struct TCP_Server_Info *server;
2048
2049         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
2050                  __func__, rdata->offset, rdata->bytes);
2051
2052         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
2053         io_parms.offset = rdata->offset;
2054         io_parms.length = rdata->bytes;
2055         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
2056         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
2057         io_parms.pid = rdata->pid;
2058
2059         server = io_parms.tcon->ses->server;
2060
2061         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
2062         if (rc) {
2063                 if (rc == -EAGAIN && rdata->credits) {
2064                         /* credits was reset by reconnect */
2065                         rdata->credits = 0;
2066                         /* reduce in_flight value since we won't send the req */
2067                         spin_lock(&server->req_lock);
2068                         server->in_flight--;
2069                         spin_unlock(&server->req_lock);
2070                 }
2071                 return rc;
2072         }
2073
2074         buf = (struct smb2_hdr *)rdata->iov.iov_base;
2075         /* 4 for rfc1002 length field */
2076         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
2077
2078         if (rdata->credits) {
2079                 buf->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2080                                                 SMB2_MAX_BUFFER_SIZE));
2081                 buf->CreditRequest = buf->CreditCharge;
2082                 spin_lock(&server->req_lock);
2083                 server->credits += rdata->credits -
2084                                                 le16_to_cpu(buf->CreditCharge);
2085                 spin_unlock(&server->req_lock);
2086                 wake_up(&server->request_q);
2087                 flags = CIFS_HAS_CREDITS;
2088         }
2089
2090         kref_get(&rdata->refcount);
2091         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2092                              cifs_readv_receive, smb2_readv_callback,
2093                              rdata, flags);
2094         if (rc) {
2095                 kref_put(&rdata->refcount, cifs_readdata_release);
2096                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
2097         }
2098
2099         cifs_small_buf_release(buf);
2100         return rc;
2101 }
2102
2103 int
2104 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
2105           unsigned int *nbytes, char **buf, int *buf_type)
2106 {
2107         int resp_buftype, rc = -EACCES;
2108         struct smb2_read_rsp *rsp = NULL;
2109         struct kvec iov[1];
2110
2111         *nbytes = 0;
2112         rc = smb2_new_read_req(iov, io_parms, 0, 0);
2113         if (rc)
2114                 return rc;
2115
2116         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
2117                           &resp_buftype, CIFS_LOG_ERROR);
2118
2119         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
2120
2121         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
2122                 free_rsp_buf(resp_buftype, iov[0].iov_base);
2123                 return 0;
2124         }
2125
2126         if (rc) {
2127                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2128                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
2129         } else {
2130                 *nbytes = le32_to_cpu(rsp->DataLength);
2131                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
2132                     (*nbytes > io_parms->length)) {
2133                         cifs_dbg(FYI, "bad length %d for count %d\n",
2134                                  *nbytes, io_parms->length);
2135                         rc = -EIO;
2136                         *nbytes = 0;
2137                 }
2138         }
2139
2140         if (*buf) {
2141                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
2142                        *nbytes);
2143                 free_rsp_buf(resp_buftype, iov[0].iov_base);
2144         } else if (resp_buftype != CIFS_NO_BUFFER) {
2145                 *buf = iov[0].iov_base;
2146                 if (resp_buftype == CIFS_SMALL_BUFFER)
2147                         *buf_type = CIFS_SMALL_BUFFER;
2148                 else if (resp_buftype == CIFS_LARGE_BUFFER)
2149                         *buf_type = CIFS_LARGE_BUFFER;
2150         }
2151         return rc;
2152 }
2153
2154 /*
2155  * Check the mid_state and signature on received buffer (if any), and queue the
2156  * workqueue completion task.
2157  */
2158 static void
2159 smb2_writev_callback(struct mid_q_entry *mid)
2160 {
2161         struct cifs_writedata *wdata = mid->callback_data;
2162         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2163         struct TCP_Server_Info *server = tcon->ses->server;
2164         unsigned int written;
2165         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
2166         unsigned int credits_received = 1;
2167
2168         switch (mid->mid_state) {
2169         case MID_RESPONSE_RECEIVED:
2170                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
2171                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
2172                 if (wdata->result != 0)
2173                         break;
2174
2175                 written = le32_to_cpu(rsp->DataLength);
2176                 /*
2177                  * Mask off high 16 bits when bytes written as returned
2178                  * by the server is greater than bytes requested by the
2179                  * client. OS/2 servers are known to set incorrect
2180                  * CountHigh values.
2181                  */
2182                 if (written > wdata->bytes)
2183                         written &= 0xFFFF;
2184
2185                 if (written < wdata->bytes)
2186                         wdata->result = -ENOSPC;
2187                 else
2188                         wdata->bytes = written;
2189                 break;
2190         case MID_REQUEST_SUBMITTED:
2191         case MID_RETRY_NEEDED:
2192                 wdata->result = -EAGAIN;
2193                 break;
2194         default:
2195                 wdata->result = -EIO;
2196                 break;
2197         }
2198
2199         if (wdata->result)
2200                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2201
2202         queue_work(cifsiod_wq, &wdata->work);
2203         mutex_lock(&server->srv_mutex);
2204         DeleteMidQEntry(mid);
2205         mutex_unlock(&server->srv_mutex);
2206         add_credits(tcon->ses->server, credits_received, 0);
2207 }
2208
2209 /* smb2_async_writev - send an async write, and set up mid to handle result */
2210 int
2211 smb2_async_writev(struct cifs_writedata *wdata,
2212                   void (*release)(struct kref *kref))
2213 {
2214         int rc = -EACCES, flags = 0;
2215         struct smb2_write_req *req = NULL;
2216         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2217         struct TCP_Server_Info *server = tcon->ses->server;
2218         struct kvec iov;
2219         struct smb_rqst rqst;
2220
2221         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
2222         if (rc) {
2223                 if (rc == -EAGAIN && wdata->credits) {
2224                         /* credits was reset by reconnect */
2225                         wdata->credits = 0;
2226                         /* reduce in_flight value since we won't send the req */
2227                         spin_lock(&server->req_lock);
2228                         server->in_flight--;
2229                         spin_unlock(&server->req_lock);
2230                 }
2231                 goto async_writev_out;
2232         }
2233
2234         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
2235
2236         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
2237         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
2238         req->WriteChannelInfoOffset = 0;
2239         req->WriteChannelInfoLength = 0;
2240         req->Channel = 0;
2241         req->Offset = cpu_to_le64(wdata->offset);
2242         /* 4 for rfc1002 length field */
2243         req->DataOffset = cpu_to_le16(
2244                                 offsetof(struct smb2_write_req, Buffer) - 4);
2245         req->RemainingBytes = 0;
2246
2247         /* 4 for rfc1002 length field and 1 for Buffer */
2248         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
2249         iov.iov_base = req;
2250
2251         rqst.rq_iov = &iov;
2252         rqst.rq_nvec = 1;
2253         rqst.rq_pages = wdata->pages;
2254         rqst.rq_npages = wdata->nr_pages;
2255         rqst.rq_pagesz = wdata->pagesz;
2256         rqst.rq_tailsz = wdata->tailsz;
2257
2258         cifs_dbg(FYI, "async write at %llu %u bytes\n",
2259                  wdata->offset, wdata->bytes);
2260
2261         req->Length = cpu_to_le32(wdata->bytes);
2262
2263         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
2264
2265         if (wdata->credits) {
2266                 req->hdr.CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2267                                                     SMB2_MAX_BUFFER_SIZE));
2268                 req->hdr.CreditRequest = req->hdr.CreditCharge;
2269                 spin_lock(&server->req_lock);
2270                 server->credits += wdata->credits -
2271                                         le16_to_cpu(req->hdr.CreditCharge);
2272                 spin_unlock(&server->req_lock);
2273                 wake_up(&server->request_q);
2274                 flags = CIFS_HAS_CREDITS;
2275         }
2276
2277         kref_get(&wdata->refcount);
2278         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, wdata,
2279                              flags);
2280
2281         if (rc) {
2282                 kref_put(&wdata->refcount, release);
2283                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2284         }
2285
2286 async_writev_out:
2287         cifs_small_buf_release(req);
2288         return rc;
2289 }
2290
2291 /*
2292  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
2293  * The length field from io_parms must be at least 1 and indicates a number of
2294  * elements with data to write that begins with position 1 in iov array. All
2295  * data length is specified by count.
2296  */
2297 int
2298 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
2299            unsigned int *nbytes, struct kvec *iov, int n_vec)
2300 {
2301         int rc = 0;
2302         struct smb2_write_req *req = NULL;
2303         struct smb2_write_rsp *rsp = NULL;
2304         int resp_buftype;
2305         *nbytes = 0;
2306
2307         if (n_vec < 1)
2308                 return rc;
2309
2310         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
2311         if (rc)
2312                 return rc;
2313
2314         if (io_parms->tcon->ses->server == NULL)
2315                 return -ECONNABORTED;
2316
2317         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
2318
2319         req->PersistentFileId = io_parms->persistent_fid;
2320         req->VolatileFileId = io_parms->volatile_fid;
2321         req->WriteChannelInfoOffset = 0;
2322         req->WriteChannelInfoLength = 0;
2323         req->Channel = 0;
2324         req->Length = cpu_to_le32(io_parms->length);
2325         req->Offset = cpu_to_le64(io_parms->offset);
2326         /* 4 for rfc1002 length field */
2327         req->DataOffset = cpu_to_le16(
2328                                 offsetof(struct smb2_write_req, Buffer) - 4);
2329         req->RemainingBytes = 0;
2330
2331         iov[0].iov_base = (char *)req;
2332         /* 4 for rfc1002 length field and 1 for Buffer */
2333         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2334
2335         /* length of entire message including data to be written */
2336         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2337
2338         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2339                           &resp_buftype, 0);
2340         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
2341
2342         if (rc) {
2343                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2344                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2345         } else
2346                 *nbytes = le32_to_cpu(rsp->DataLength);
2347
2348         free_rsp_buf(resp_buftype, rsp);
2349         return rc;
2350 }
2351
2352 static unsigned int
2353 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2354 {
2355         int len;
2356         unsigned int entrycount = 0;
2357         unsigned int next_offset = 0;
2358         FILE_DIRECTORY_INFO *entryptr;
2359
2360         if (bufstart == NULL)
2361                 return 0;
2362
2363         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2364
2365         while (1) {
2366                 entryptr = (FILE_DIRECTORY_INFO *)
2367                                         ((char *)entryptr + next_offset);
2368
2369                 if ((char *)entryptr + size > end_of_buf) {
2370                         cifs_dbg(VFS, "malformed search entry would overflow\n");
2371                         break;
2372                 }
2373
2374                 len = le32_to_cpu(entryptr->FileNameLength);
2375                 if ((char *)entryptr + len + size > end_of_buf) {
2376                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2377                                  end_of_buf);
2378                         break;
2379                 }
2380
2381                 *lastentry = (char *)entryptr;
2382                 entrycount++;
2383
2384                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2385                 if (!next_offset)
2386                         break;
2387         }
2388
2389         return entrycount;
2390 }
2391
2392 /*
2393  * Readdir/FindFirst
2394  */
2395 int
2396 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2397                      u64 persistent_fid, u64 volatile_fid, int index,
2398                      struct cifs_search_info *srch_inf)
2399 {
2400         struct smb2_query_directory_req *req;
2401         struct smb2_query_directory_rsp *rsp = NULL;
2402         struct kvec iov[2];
2403         int rc = 0;
2404         int len;
2405         int resp_buftype = CIFS_NO_BUFFER;
2406         unsigned char *bufptr;
2407         struct TCP_Server_Info *server;
2408         struct cifs_ses *ses = tcon->ses;
2409         __le16 asteriks = cpu_to_le16('*');
2410         char *end_of_smb;
2411         unsigned int output_size = CIFSMaxBufSize;
2412         size_t info_buf_size;
2413
2414         if (ses && (ses->server))
2415                 server = ses->server;
2416         else
2417                 return -EIO;
2418
2419         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2420         if (rc)
2421                 return rc;
2422
2423         switch (srch_inf->info_level) {
2424         case SMB_FIND_FILE_DIRECTORY_INFO:
2425                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2426                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2427                 break;
2428         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2429                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2430                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2431                 break;
2432         default:
2433                 cifs_dbg(VFS, "info level %u isn't supported\n",
2434                          srch_inf->info_level);
2435                 rc = -EINVAL;
2436                 goto qdir_exit;
2437         }
2438
2439         req->FileIndex = cpu_to_le32(index);
2440         req->PersistentFileId = persistent_fid;
2441         req->VolatileFileId = volatile_fid;
2442
2443         len = 0x2;
2444         bufptr = req->Buffer;
2445         memcpy(bufptr, &asteriks, len);
2446
2447         req->FileNameOffset =
2448                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2449         req->FileNameLength = cpu_to_le16(len);
2450         /*
2451          * BB could be 30 bytes or so longer if we used SMB2 specific
2452          * buffer lengths, but this is safe and close enough.
2453          */
2454         output_size = min_t(unsigned int, output_size, server->maxBuf);
2455         output_size = min_t(unsigned int, output_size, 2 << 15);
2456         req->OutputBufferLength = cpu_to_le32(output_size);
2457
2458         iov[0].iov_base = (char *)req;
2459         /* 4 for RFC1001 length and 1 for Buffer */
2460         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2461
2462         iov[1].iov_base = (char *)(req->Buffer);
2463         iov[1].iov_len = len;
2464
2465         inc_rfc1001_len(req, len - 1 /* Buffer */);
2466
2467         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2468         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2469
2470         if (rc) {
2471                 if (rc == -ENODATA && rsp->hdr.Status == STATUS_NO_MORE_FILES) {
2472                         srch_inf->endOfSearch = true;
2473                         rc = 0;
2474                 }
2475                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2476                 goto qdir_exit;
2477         }
2478
2479         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2480                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2481                           info_buf_size);
2482         if (rc)
2483                 goto qdir_exit;
2484
2485         srch_inf->unicode = true;
2486
2487         if (srch_inf->ntwrk_buf_start) {
2488                 if (srch_inf->smallBuf)
2489                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2490                 else
2491                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2492         }
2493         srch_inf->ntwrk_buf_start = (char *)rsp;
2494         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2495                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2496         /* 4 for rfc1002 length field */
2497         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2498         srch_inf->entries_in_buffer =
2499                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2500                                     &srch_inf->last_entry, info_buf_size);
2501         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2502         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2503                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2504                  srch_inf->srch_entries_start, srch_inf->last_entry);
2505         if (resp_buftype == CIFS_LARGE_BUFFER)
2506                 srch_inf->smallBuf = false;
2507         else if (resp_buftype == CIFS_SMALL_BUFFER)
2508                 srch_inf->smallBuf = true;
2509         else
2510                 cifs_dbg(VFS, "illegal search buffer type\n");
2511
2512         return rc;
2513
2514 qdir_exit:
2515         free_rsp_buf(resp_buftype, rsp);
2516         return rc;
2517 }
2518
2519 static int
2520 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2521                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2522                unsigned int num, void **data, unsigned int *size)
2523 {
2524         struct smb2_set_info_req *req;
2525         struct smb2_set_info_rsp *rsp = NULL;
2526         struct kvec *iov;
2527         int rc = 0;
2528         int resp_buftype;
2529         unsigned int i;
2530         struct TCP_Server_Info *server;
2531         struct cifs_ses *ses = tcon->ses;
2532
2533         if (ses && (ses->server))
2534                 server = ses->server;
2535         else
2536                 return -EIO;
2537
2538         if (!num)
2539                 return -EINVAL;
2540
2541         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2542         if (!iov)
2543                 return -ENOMEM;
2544
2545         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2546         if (rc) {
2547                 kfree(iov);
2548                 return rc;
2549         }
2550
2551         req->hdr.ProcessId = cpu_to_le32(pid);
2552
2553         req->InfoType = SMB2_O_INFO_FILE;
2554         req->FileInfoClass = info_class;
2555         req->PersistentFileId = persistent_fid;
2556         req->VolatileFileId = volatile_fid;
2557
2558         /* 4 for RFC1001 length and 1 for Buffer */
2559         req->BufferOffset =
2560                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2561         req->BufferLength = cpu_to_le32(*size);
2562
2563         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2564
2565         memcpy(req->Buffer, *data, *size);
2566
2567         iov[0].iov_base = (char *)req;
2568         /* 4 for RFC1001 length */
2569         iov[0].iov_len = get_rfc1002_length(req) + 4;
2570
2571         for (i = 1; i < num; i++) {
2572                 inc_rfc1001_len(req, size[i]);
2573                 le32_add_cpu(&req->BufferLength, size[i]);
2574                 iov[i].iov_base = (char *)data[i];
2575                 iov[i].iov_len = size[i];
2576         }
2577
2578         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2579         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2580
2581         if (rc != 0)
2582                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2583
2584         free_rsp_buf(resp_buftype, rsp);
2585         kfree(iov);
2586         return rc;
2587 }
2588
2589 int
2590 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2591             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2592 {
2593         struct smb2_file_rename_info info;
2594         void **data;
2595         unsigned int size[2];
2596         int rc;
2597         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2598
2599         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2600         if (!data)
2601                 return -ENOMEM;
2602
2603         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2604                               /* 0 = fail if target already exists */
2605         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2606         info.FileNameLength = cpu_to_le32(len);
2607
2608         data[0] = &info;
2609         size[0] = sizeof(struct smb2_file_rename_info);
2610
2611         data[1] = target_file;
2612         size[1] = len + 2 /* null */;
2613
2614         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2615                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2616                            size);
2617         kfree(data);
2618         return rc;
2619 }
2620
2621 int
2622 SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
2623                   u64 persistent_fid, u64 volatile_fid)
2624 {
2625         __u8 delete_pending = 1;
2626         void *data;
2627         unsigned int size;
2628
2629         data = &delete_pending;
2630         size = 1; /* sizeof __u8 */
2631
2632         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2633                         current->tgid, FILE_DISPOSITION_INFORMATION, 1, &data,
2634                         &size);
2635 }
2636
2637 int
2638 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2639                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2640 {
2641         struct smb2_file_link_info info;
2642         void **data;
2643         unsigned int size[2];
2644         int rc;
2645         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2646
2647         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2648         if (!data)
2649                 return -ENOMEM;
2650
2651         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2652                               /* 0 = fail if link already exists */
2653         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2654         info.FileNameLength = cpu_to_le32(len);
2655
2656         data[0] = &info;
2657         size[0] = sizeof(struct smb2_file_link_info);
2658
2659         data[1] = target_file;
2660         size[1] = len + 2 /* null */;
2661
2662         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2663                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2664         kfree(data);
2665         return rc;
2666 }
2667
2668 int
2669 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2670              u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
2671 {
2672         struct smb2_file_eof_info info;
2673         void *data;
2674         unsigned int size;
2675
2676         info.EndOfFile = *eof;
2677
2678         data = &info;
2679         size = sizeof(struct smb2_file_eof_info);
2680
2681         if (is_falloc)
2682                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2683                         pid, FILE_ALLOCATION_INFORMATION, 1, &data, &size);
2684         else
2685                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2686                         pid, FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2687 }
2688
2689 int
2690 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2691               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2692 {
2693         unsigned int size;
2694         size = sizeof(FILE_BASIC_INFO);
2695         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2696                              current->tgid, FILE_BASIC_INFORMATION, 1,
2697                              (void **)&buf, &size);
2698 }
2699
2700 int
2701 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2702                   const u64 persistent_fid, const u64 volatile_fid,
2703                   __u8 oplock_level)
2704 {
2705         int rc;
2706         struct smb2_oplock_break *req = NULL;
2707
2708         cifs_dbg(FYI, "SMB2_oplock_break\n");
2709         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2710
2711         if (rc)
2712                 return rc;
2713
2714         req->VolatileFid = volatile_fid;
2715         req->PersistentFid = persistent_fid;
2716         req->OplockLevel = oplock_level;
2717         req->hdr.CreditRequest = cpu_to_le16(1);
2718
2719         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2720         /* SMB2 buffer freed by function above */
2721
2722         if (rc) {
2723                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2724                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2725         }
2726
2727         return rc;
2728 }
2729
2730 static void
2731 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2732                         struct kstatfs *kst)
2733 {
2734         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2735                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2736         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2737         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2738         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2739         return;
2740 }
2741
2742 static int
2743 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2744                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2745 {
2746         int rc;
2747         struct smb2_query_info_req *req;
2748
2749         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2750
2751         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2752                 return -EIO;
2753
2754         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2755         if (rc)
2756                 return rc;
2757
2758         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2759         req->FileInfoClass = level;
2760         req->PersistentFileId = persistent_fid;
2761         req->VolatileFileId = volatile_fid;
2762         /* 4 for rfc1002 length field and 1 for pad */
2763         req->InputBufferOffset =
2764                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2765         req->OutputBufferLength = cpu_to_le32(
2766                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2767
2768         iov->iov_base = (char *)req;
2769         /* 4 for rfc1002 length field */
2770         iov->iov_len = get_rfc1002_length(req) + 4;
2771         return 0;
2772 }
2773
2774 int
2775 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2776               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2777 {
2778         struct smb2_query_info_rsp *rsp = NULL;
2779         struct kvec iov;
2780         int rc = 0;
2781         int resp_buftype;
2782         struct cifs_ses *ses = tcon->ses;
2783         struct smb2_fs_full_size_info *info = NULL;
2784
2785         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2786                                 sizeof(struct smb2_fs_full_size_info),
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 qfsinf_exit;
2795         }
2796         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2797
2798         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2799                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2800         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2801                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2802                           sizeof(struct smb2_fs_full_size_info));
2803         if (!rc)
2804                 copy_fs_info_to_kstatfs(info, fsdata);
2805
2806 qfsinf_exit:
2807         free_rsp_buf(resp_buftype, iov.iov_base);
2808         return rc;
2809 }
2810
2811 int
2812 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
2813               u64 persistent_fid, u64 volatile_fid, int level)
2814 {
2815         struct smb2_query_info_rsp *rsp = NULL;
2816         struct kvec iov;
2817         int rc = 0;
2818         int resp_buftype, max_len, min_len;
2819         struct cifs_ses *ses = tcon->ses;
2820         unsigned int rsp_len, offset;
2821
2822         if (level == FS_DEVICE_INFORMATION) {
2823                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2824                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2825         } else if (level == FS_ATTRIBUTE_INFORMATION) {
2826                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
2827                 min_len = MIN_FS_ATTR_INFO_SIZE;
2828         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
2829                 max_len = sizeof(struct smb3_fs_ss_info);
2830                 min_len = sizeof(struct smb3_fs_ss_info);
2831         } else {
2832                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
2833                 return -EINVAL;
2834         }
2835
2836         rc = build_qfs_info_req(&iov, tcon, level, max_len,
2837                                 persistent_fid, volatile_fid);
2838         if (rc)
2839                 return rc;
2840
2841         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2842         if (rc) {
2843                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2844                 goto qfsattr_exit;
2845         }
2846         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2847
2848         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
2849         offset = le16_to_cpu(rsp->OutputBufferOffset);
2850         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
2851         if (rc)
2852                 goto qfsattr_exit;
2853
2854         if (level == FS_ATTRIBUTE_INFORMATION)
2855                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
2856                         + (char *)&rsp->hdr, min_t(unsigned int,
2857                         rsp_len, max_len));
2858         else if (level == FS_DEVICE_INFORMATION)
2859                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
2860                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
2861         else if (level == FS_SECTOR_SIZE_INFORMATION) {
2862                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
2863                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
2864                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
2865                 tcon->perf_sector_size =
2866                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
2867         }
2868
2869 qfsattr_exit:
2870         free_rsp_buf(resp_buftype, iov.iov_base);
2871         return rc;
2872 }
2873
2874 int
2875 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2876            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2877            const __u32 num_lock, struct smb2_lock_element *buf)
2878 {
2879         int rc = 0;
2880         struct smb2_lock_req *req = NULL;
2881         struct kvec iov[2];
2882         int resp_buf_type;
2883         unsigned int count;
2884
2885         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2886
2887         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2888         if (rc)
2889                 return rc;
2890
2891         req->hdr.ProcessId = cpu_to_le32(pid);
2892         req->LockCount = cpu_to_le16(num_lock);
2893
2894         req->PersistentFileId = persist_fid;
2895         req->VolatileFileId = volatile_fid;
2896
2897         count = num_lock * sizeof(struct smb2_lock_element);
2898         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2899
2900         iov[0].iov_base = (char *)req;
2901         /* 4 for rfc1002 length field and count for all locks */
2902         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2903         iov[1].iov_base = (char *)buf;
2904         iov[1].iov_len = count;
2905
2906         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2907         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2908         if (rc) {
2909                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2910                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2911         }
2912
2913         return rc;
2914 }
2915
2916 int
2917 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2918           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2919           const __u64 length, const __u64 offset, const __u32 lock_flags,
2920           const bool wait)
2921 {
2922         struct smb2_lock_element lock;
2923
2924         lock.Offset = cpu_to_le64(offset);
2925         lock.Length = cpu_to_le64(length);
2926         lock.Flags = cpu_to_le32(lock_flags);
2927         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2928                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2929
2930         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2931 }
2932
2933 int
2934 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2935                  __u8 *lease_key, const __le32 lease_state)
2936 {
2937         int rc;
2938         struct smb2_lease_ack *req = NULL;
2939
2940         cifs_dbg(FYI, "SMB2_lease_break\n");
2941         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2942
2943         if (rc)
2944                 return rc;
2945
2946         req->hdr.CreditRequest = cpu_to_le16(1);
2947         req->StructureSize = cpu_to_le16(36);
2948         inc_rfc1001_len(req, 12);
2949
2950         memcpy(req->LeaseKey, lease_key, 16);
2951         req->LeaseState = lease_state;
2952
2953         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2954         /* SMB2 buffer freed by function above */
2955
2956         if (rc) {
2957                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2958                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2959         }
2960
2961         return rc;
2962 }