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 static int encryption_required(const struct cifs_tcon *tcon)
  81 {
  82         if (!tcon)
  83                 return 0;
  84         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  85             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  86                 return 1;
  87         if (tcon->seal &&
  88             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  89                 return 1;
  90         return 0;
  91 }
  92
  93 static void
  94 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
  95                   const struct cifs_tcon *tcon)
  96 {
  97         shdr->ProtocolId = SMB2_PROTO_NUMBER;
  98         shdr->StructureSize = cpu_to_le16(64);
  99         shdr->Command = smb2_cmd;
 100         if (tcon && tcon->ses && tcon->ses->server) {
 101                 struct TCP_Server_Info *server = tcon->ses->server;
 102
 103                 spin_lock(&server->req_lock);
 104                 /* Request up to 2 credits but don't go over the limit. */
 105                 if (server->credits >= server->max_credits)
 106                         shdr->CreditRequest = cpu_to_le16(0);
 107                 else
 108                         shdr->CreditRequest = cpu_to_le16(
 109                                 min_t(int, server->max_credits -
 110                                                 server->credits, 2));
 111                 spin_unlock(&server->req_lock);
 112         } else {
 113                 shdr->CreditRequest = cpu_to_le16(2);
 114         }
 115         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 116
 117         if (!tcon)
 118                 goto out;
 119
 120         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 121         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 122         if ((tcon->ses) && (tcon->ses->server) &&
 123             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 124                 shdr->CreditCharge = cpu_to_le16(1);
 125         /* else CreditCharge MBZ */
 126
 127         shdr->TreeId = tcon->tid;
 128         /* Uid is not converted */
 129         if (tcon->ses)
 130                 shdr->SessionId = tcon->ses->Suid;
 131
 132         /*
 133          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 134          * to pass the path on the Open SMB prefixed by \\server\share.
 135          * Not sure when we would need to do the augmented path (if ever) and
 136          * setting this flag breaks the SMB2 open operation since it is
 137          * illegal to send an empty path name (without \\server\share prefix)
 138          * when the DFS flag is set in the SMB open header. We could
 139          * consider setting the flag on all operations other than open
 140          * but it is safer to net set it for now.
 141          */
 142 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 143                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 144
 145         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
 146             !encryption_required(tcon))
 147                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 148 out:
 149         return;
 150 }
 151
 152 static int
 153 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 154 {
 155         int rc = 0;
 156         struct nls_table *nls_codepage;
 157         struct cifs_ses *ses;
 158         struct TCP_Server_Info *server;
 159
 160         /*
 161          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 162          * check for tcp and smb session status done differently
 163          * for those three - in the calling routine.
 164          */
 165         if (tcon == NULL)
 166                 return rc;
 167
 168         if (smb2_command == SMB2_TREE_CONNECT)
 169                 return rc;
 170
 171         if (tcon->tidStatus == CifsExiting) {
 172                 /*
 173                  * only tree disconnect, open, and write,
 174                  * (and ulogoff which does not have tcon)
 175                  * are allowed as we start force umount.
 176                  */
 177                 if ((smb2_command != SMB2_WRITE) &&
 178                    (smb2_command != SMB2_CREATE) &&
 179                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 180                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 181                                  smb2_command);
 182                         return -ENODEV;
 183                 }
 184         }
 185         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 186             (!tcon->ses->server))
 187                 return -EIO;
 188
 189         ses = tcon->ses;
 190         server = ses->server;
 191
 192         /*
 193          * Give demultiplex thread up to 10 seconds to reconnect, should be
 194          * greater than cifs socket timeout which is 7 seconds
 195          */
 196         while (server->tcpStatus == CifsNeedReconnect) {
 197                 /*
 198                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 199                  * here since they are implicitly done when session drops.
 200                  */
 201                 switch (smb2_command) {
 202                 /*
 203                  * BB Should we keep oplock break and add flush to exceptions?
 204                  */
 205                 case SMB2_TREE_DISCONNECT:
 206                 case SMB2_CANCEL:
 207                 case SMB2_CLOSE:
 208                 case SMB2_OPLOCK_BREAK:
 209                         return -EAGAIN;
 210                 }
 211
 212                 wait_event_interruptible_timeout(server->response_q,
 213                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 214
 215                 /* are we still trying to reconnect? */
 216                 if (server->tcpStatus != CifsNeedReconnect)
 217                         break;
 218
 219                 /*
 220                  * on "soft" mounts we wait once. Hard mounts keep
 221                  * retrying until process is killed or server comes
 222                  * back on-line
 223                  */
 224                 if (!tcon->retry) {
 225                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 226                         return -EHOSTDOWN;
 227                 }
 228         }
 229
 230         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 231                 return rc;
 232
 233         nls_codepage = load_nls_default();
 234
 235         /*
 236          * need to prevent multiple threads trying to simultaneously reconnect
 237          * the same SMB session
 238          */
 239         mutex_lock(&tcon->ses->session_mutex);
 240         rc = cifs_negotiate_protocol(0, tcon->ses);
 241         if (!rc && tcon->ses->need_reconnect)
 242                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 243
 244         if (rc || !tcon->need_reconnect) {
 245                 mutex_unlock(&tcon->ses->session_mutex);
 246                 goto out;
 247         }
 248
 249         cifs_mark_open_files_invalid(tcon);
 250         if (tcon->use_persistent)
 251                 tcon->need_reopen_files = true;
 252
 253         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 254         mutex_unlock(&tcon->ses->session_mutex);
 255
 256         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 257         if (rc)
 258                 goto out;
 259
 260         if (smb2_command != SMB2_INTERNAL_CMD)
 261                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
 262
 263         atomic_inc(&tconInfoReconnectCount);
 264 out:
 265         /*
 266          * Check if handle based operation so we know whether we can continue
 267          * or not without returning to caller to reset file handle.
 268          */
 269         /*
 270          * BB Is flush done by server on drop of tcp session? Should we special
 271          * case it and skip above?
 272          */
 273         switch (smb2_command) {
 274         case SMB2_FLUSH:
 275         case SMB2_READ:
 276         case SMB2_WRITE:
 277         case SMB2_LOCK:
 278         case SMB2_IOCTL:
 279         case SMB2_QUERY_DIRECTORY:
 280         case SMB2_CHANGE_NOTIFY:
 281         case SMB2_QUERY_INFO:
 282         case SMB2_SET_INFO:
 283                 rc = -EAGAIN;
 284         }
 285         unload_nls(nls_codepage);
 286         return rc;
 287 }
 288
 289 static void
 290 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
 291                unsigned int *total_len)
 292 {
 293         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 294         /* lookup word count ie StructureSize from table */
 295         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 296
 297         /*
 298          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 299          * largest operations (Create)
 300          */
 301         memset(buf, 0, 256);
 302
 303         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
 304         spdu->StructureSize2 = cpu_to_le16(parmsize);
 305
 306         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 307 }
 308
 309 /* init request without RFC1001 length at the beginning */
 310 static int
 311 smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 312                     void **request_buf, unsigned int *total_len)
 313 {
 314         int rc;
 315         struct smb2_sync_hdr *shdr;
 316
 317         rc = smb2_reconnect(smb2_command, tcon);
 318         if (rc)
 319                 return rc;
 320
 321         /* BB eventually switch this to SMB2 specific small buf size */
 322         *request_buf = cifs_small_buf_get();
 323         if (*request_buf == NULL) {
 324                 /* BB should we add a retry in here if not a writepage? */
 325                 return -ENOMEM;
 326         }
 327
 328         shdr = (struct smb2_sync_hdr *)(*request_buf);
 329
 330         fill_small_buf(smb2_command, tcon, shdr, total_len);
 331
 332         if (tcon != NULL) {
 333 #ifdef CONFIG_CIFS_STATS2
 334                 uint16_t com_code = le16_to_cpu(smb2_command);
 335
 336                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 337 #endif
 338                 cifs_stats_inc(&tcon->num_smbs_sent);
 339         }
 340
 341         return rc;
 342 }
 343
 344 /*
 345  * Allocate and return pointer to an SMB request hdr, and set basic
 346  * SMB information in the SMB header. If the return code is zero, this
 347  * function must have filled in request_buf pointer. The returned buffer
 348  * has RFC1001 length at the beginning.
 349  */
 350 static int
 351 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 352                 void **request_buf)
 353 {
 354         int rc;
 355         unsigned int total_len;
 356         struct smb2_pdu *pdu;
 357
 358         rc = smb2_reconnect(smb2_command, tcon);
 359         if (rc)
 360                 return rc;
 361
 362         /* BB eventually switch this to SMB2 specific small buf size */
 363         *request_buf = cifs_small_buf_get();
 364         if (*request_buf == NULL) {
 365                 /* BB should we add a retry in here if not a writepage? */
 366                 return -ENOMEM;
 367         }
 368
 369         pdu = (struct smb2_pdu *)(*request_buf);
 370
 371         fill_small_buf(smb2_command, tcon, get_sync_hdr(pdu), &total_len);
 372
 373         /* Note this is only network field converted to big endian */
 374         pdu->hdr.smb2_buf_length = cpu_to_be32(total_len);
 375
 376         if (tcon != NULL) {
 377 #ifdef CONFIG_CIFS_STATS2
 378                 uint16_t com_code = le16_to_cpu(smb2_command);
 379                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 380 #endif
 381                 cifs_stats_inc(&tcon->num_smbs_sent);
 382         }
 383
 384         return rc;
 385 }
 386
 387 #ifdef CONFIG_CIFS_SMB311
 388 /* offset is sizeof smb2_negotiate_req - 4 but rounded up to 8 bytes */
 389 #define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) - 4 */
 390
 391
 392 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
 393 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
 394
 395 static void
 396 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 397 {
 398         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 399         pneg_ctxt->DataLength = cpu_to_le16(38);
 400         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 401         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 402         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 403         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 404 }
 405
 406 static void
 407 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 408 {
 409         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 410         pneg_ctxt->DataLength = cpu_to_le16(6);
 411         pneg_ctxt->CipherCount = cpu_to_le16(2);
 412         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 413         pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 414 }
 415
 416 static void
 417 assemble_neg_contexts(struct smb2_negotiate_req *req)
 418 {
 419
 420         /* +4 is to account for the RFC1001 len field */
 421         char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT + 4;
 422
 423         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 424         /* Add 2 to size to round to 8 byte boundary */
 425         pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
 426         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 427         req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
 428         req->NegotiateContextCount = cpu_to_le16(2);
 429         inc_rfc1001_len(req, 4 + sizeof(struct smb2_preauth_neg_context) + 2
 430                         + sizeof(struct smb2_encryption_neg_context)); /* calculate hash */
 431 }
 432 #else
 433 static void assemble_neg_contexts(struct smb2_negotiate_req *req)
 434 {
 435         return;
 436 }
 437 #endif /* SMB311 */
 438
 439 /*
 440  *
 441  *      SMB2 Worker functions follow:
 442  *
 443  *      The general structure of the worker functions is:
 444  *      1) Call smb2_init (assembles SMB2 header)
 445  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 446  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 447  *      4) Decode SMB2 command specific fields in the fixed length area
 448  *      5) Decode variable length data area (if any for this SMB2 command type)
 449  *      6) Call free smb buffer
 450  *      7) return
 451  *
 452  */
 453
 454 int
 455 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 456 {
 457         struct smb2_negotiate_req *req;
 458         struct smb2_negotiate_rsp *rsp;
 459         struct kvec iov[1];
 460         struct kvec rsp_iov;
 461         int rc = 0;
 462         int resp_buftype;
 463         struct TCP_Server_Info *server = ses->server;
 464         int blob_offset, blob_length;
 465         char *security_blob;
 466         int flags = CIFS_NEG_OP;
 467
 468         cifs_dbg(FYI, "Negotiate protocol\n");
 469
 470         if (!server) {
 471                 WARN(1, "%s: server is NULL!\n", __func__);
 472                 return -EIO;
 473         }
 474
 475         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 476         if (rc)
 477                 return rc;
 478
 479         req->hdr.sync_hdr.SessionId = 0;
 480
 481         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 482
 483         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
 484         inc_rfc1001_len(req, 2);
 485
 486         /* only one of SMB2 signing flags may be set in SMB2 request */
 487         if (ses->sign)
 488                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 489         else if (global_secflags & CIFSSEC_MAY_SIGN)
 490                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 491         else
 492                 req->SecurityMode = 0;
 493
 494         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 495
 496         /* ClientGUID must be zero for SMB2.02 dialect */
 497         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 498                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 499         else {
 500                 memcpy(req->ClientGUID, server->client_guid,
 501                         SMB2_CLIENT_GUID_SIZE);
 502                 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
 503                         assemble_neg_contexts(req);
 504         }
 505         iov[0].iov_base = (char *)req;
 506         /* 4 for rfc1002 length field */
 507         iov[0].iov_len = get_rfc1002_length(req) + 4;
 508
 509         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
 510         cifs_small_buf_release(req);
 511         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 512         /*
 513          * No tcon so can't do
 514          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 515          */
 516         if (rc != 0)
 517                 goto neg_exit;
 518
 519         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 520
 521         /* BB we may eventually want to match the negotiated vs. requested
 522            dialect, even though we are only requesting one at a time */
 523         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 524                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 525         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 526                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 527         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 528                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 529         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 530                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 531 #ifdef CONFIG_CIFS_SMB311
 532         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 533                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 534 #endif /* SMB311 */
 535         else {
 536                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 537                          le16_to_cpu(rsp->DialectRevision));
 538                 rc = -EIO;
 539                 goto neg_exit;
 540         }
 541         server->dialect = le16_to_cpu(rsp->DialectRevision);
 542
 543         /* SMB2 only has an extended negflavor */
 544         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 545         /* set it to the maximum buffer size value we can send with 1 credit */
 546         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 547                                SMB2_MAX_BUFFER_SIZE);
 548         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 549         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 550         /* BB Do we need to validate the SecurityMode? */
 551         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 552         server->capabilities = le32_to_cpu(rsp->Capabilities);
 553         /* Internal types */
 554         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 555
 556         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 557                                                &rsp->hdr);
 558         /*
 559          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 560          * for us will be
 561          *      ses->sectype = RawNTLMSSP;
 562          * but for time being this is our only auth choice so doesn't matter.
 563          * We just found a server which sets blob length to zero expecting raw.
 564          */
 565         if (blob_length == 0)
 566                 cifs_dbg(FYI, "missing security blob on negprot\n");
 567
 568         rc = cifs_enable_signing(server, ses->sign);
 569         if (rc)
 570                 goto neg_exit;
 571         if (blob_length) {
 572                 rc = decode_negTokenInit(security_blob, blob_length, server);
 573                 if (rc == 1)
 574                         rc = 0;
 575                 else if (rc == 0)
 576                         rc = -EIO;
 577         }
 578 neg_exit:
 579         free_rsp_buf(resp_buftype, rsp);
 580         return rc;
 581 }
 582
 583 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 584 {
 585         int rc = 0;
 586         struct validate_negotiate_info_req vneg_inbuf;
 587         struct validate_negotiate_info_rsp *pneg_rsp;
 588         u32 rsplen;
 589
 590         cifs_dbg(FYI, "validate negotiate\n");
 591
 592         /*
 593          * validation ioctl must be signed, so no point sending this if we
 594          * can not sign it.  We could eventually change this to selectively
 595          * sign just this, the first and only signed request on a connection.
 596          * This is good enough for now since a user who wants better security
 597          * would also enable signing on the mount. Having validation of
 598          * negotiate info for signed connections helps reduce attack vectors
 599          */
 600         if (tcon->ses->server->sign == false)
 601                 return 0; /* validation requires signing */
 602
 603         vneg_inbuf.Capabilities =
 604                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 605         memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
 606                                         SMB2_CLIENT_GUID_SIZE);
 607
 608         if (tcon->ses->sign)
 609                 vneg_inbuf.SecurityMode =
 610                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 611         else if (global_secflags & CIFSSEC_MAY_SIGN)
 612                 vneg_inbuf.SecurityMode =
 613                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 614         else
 615                 vneg_inbuf.SecurityMode = 0;
 616
 617         vneg_inbuf.DialectCount = cpu_to_le16(1);
 618         vneg_inbuf.Dialects[0] =
 619                 cpu_to_le16(tcon->ses->server->vals->protocol_id);
 620
 621         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 622                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 623                 false /* use_ipc */,
 624                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
 625                 (char **)&pneg_rsp, &rsplen);
 626
 627         if (rc != 0) {
 628                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 629                 return -EIO;
 630         }
 631
 632         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
 633                 cifs_dbg(VFS, "invalid size of protocol negotiate response\n");
 634                 return -EIO;
 635         }
 636
 637         /* check validate negotiate info response matches what we got earlier */
 638         if (pneg_rsp->Dialect !=
 639                         cpu_to_le16(tcon->ses->server->vals->protocol_id))
 640                 goto vneg_out;
 641
 642         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 643                 goto vneg_out;
 644
 645         /* do not validate server guid because not saved at negprot time yet */
 646
 647         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 648               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 649                 goto vneg_out;
 650
 651         /* validate negotiate successful */
 652         cifs_dbg(FYI, "validate negotiate info successful\n");
 653         return 0;
 654
 655 vneg_out:
 656         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 657         return -EIO;
 658 }
 659
 660 enum securityEnum
 661 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
 662 {
 663         switch (requested) {
 664         case Kerberos:
 665         case RawNTLMSSP:
 666                 return requested;
 667         case NTLMv2:
 668                 return RawNTLMSSP;
 669         case Unspecified:
 670                 if (server->sec_ntlmssp &&
 671                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
 672                         return RawNTLMSSP;
 673                 if ((server->sec_kerberos || server->sec_mskerberos) &&
 674                         (global_secflags & CIFSSEC_MAY_KRB5))
 675                         return Kerberos;
 676                 /* Fallthrough */
 677         default:
 678                 return Unspecified;
 679         }
 680 }
 681
 682 struct SMB2_sess_data {
 683         unsigned int xid;
 684         struct cifs_ses *ses;
 685         struct nls_table *nls_cp;
 686         void (*func)(struct SMB2_sess_data *);
 687         int result;
 688         u64 previous_session;
 689
 690         /* we will send the SMB in three pieces:
 691          * a fixed length beginning part, an optional
 692          * SPNEGO blob (which can be zero length), and a
 693          * last part which will include the strings
 694          * and rest of bcc area. This allows us to avoid
 695          * a large buffer 17K allocation
 696          */
 697         int buf0_type;
 698         struct kvec iov[2];
 699 };
 700
 701 static int
 702 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
 703 {
 704         int rc;
 705         struct cifs_ses *ses = sess_data->ses;
 706         struct smb2_sess_setup_req *req;
 707         struct TCP_Server_Info *server = ses->server;
 708
 709         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 710         if (rc)
 711                 return rc;
 712
 713         /* First session, not a reauthenticate */
 714         req->hdr.sync_hdr.SessionId = 0;
 715
 716         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
 717         req->PreviousSessionId = sess_data->previous_session;
 718
 719         req->Flags = 0; /* MBZ */
 720         /* to enable echos and oplocks */
 721         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(3);
 722
 723         /* only one of SMB2 signing flags may be set in SMB2 request */
 724         if (server->sign)
 725                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 726         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 727                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 728         else
 729                 req->SecurityMode = 0;
 730
 731         req->Capabilities = 0;
 732         req->Channel = 0; /* MBZ */
 733
 734         sess_data->iov[0].iov_base = (char *)req;
 735         /* 4 for rfc1002 length field and 1 for pad */
 736         sess_data->iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 737         /*
 738          * This variable will be used to clear the buffer
 739          * allocated above in case of any error in the calling function.
 740          */
 741         sess_data->buf0_type = CIFS_SMALL_BUFFER;
 742
 743         return 0;
 744 }
 745
 746 static void
 747 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
 748 {
 749         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
 750         sess_data->buf0_type = CIFS_NO_BUFFER;
 751 }
 752
 753 static int
 754 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
 755 {
 756         int rc;
 757         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
 758         struct kvec rsp_iov = { NULL, 0 };
 759
 760         /* Testing shows that buffer offset must be at location of Buffer[0] */
 761         req->SecurityBufferOffset =
 762                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 763                         1 /* pad */ - 4 /* rfc1001 len */);
 764         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
 765
 766         inc_rfc1001_len(req, sess_data->iov[1].iov_len - 1 /* pad */);
 767
 768         /* BB add code to build os and lm fields */
 769
 770         rc = SendReceive2(sess_data->xid, sess_data->ses,
 771                                 sess_data->iov, 2,
 772                                 &sess_data->buf0_type,
 773                                 CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
 774         cifs_small_buf_release(sess_data->iov[0].iov_base);
 775         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
 776
 777         return rc;
 778 }
 779
 780 static int
 781 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
 782 {
 783         int rc = 0;
 784         struct cifs_ses *ses = sess_data->ses;
 785
 786         mutex_lock(&ses->server->srv_mutex);
 787         if (ses->server->ops->generate_signingkey) {
 788                 rc = ses->server->ops->generate_signingkey(ses);
 789                 if (rc) {
 790                         cifs_dbg(FYI,
 791                                 "SMB3 session key generation failed\n");
 792                         mutex_unlock(&ses->server->srv_mutex);
 793                         return rc;
 794                 }
 795         }
 796         if (!ses->server->session_estab) {
 797                 ses->server->sequence_number = 0x2;
 798                 ses->server->session_estab = true;
 799         }
 800         mutex_unlock(&ses->server->srv_mutex);
 801
 802         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 803         spin_lock(&GlobalMid_Lock);
 804         ses->status = CifsGood;
 805         ses->need_reconnect = false;
 806         spin_unlock(&GlobalMid_Lock);
 807         return rc;
 808 }
 809
 810 #ifdef CONFIG_CIFS_UPCALL
 811 static void
 812 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
 813 {
 814         int rc;
 815         struct cifs_ses *ses = sess_data->ses;
 816         struct cifs_spnego_msg *msg;
 817         struct key *spnego_key = NULL;
 818         struct smb2_sess_setup_rsp *rsp = NULL;
 819
 820         rc = SMB2_sess_alloc_buffer(sess_data);
 821         if (rc)
 822                 goto out;
 823
 824         spnego_key = cifs_get_spnego_key(ses);
 825         if (IS_ERR(spnego_key)) {
 826                 rc = PTR_ERR(spnego_key);
 827                 spnego_key = NULL;
 828                 goto out;
 829         }
 830
 831         msg = spnego_key->payload.data[0];
 832         /*
 833          * check version field to make sure that cifs.upcall is
 834          * sending us a response in an expected form
 835          */
 836         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
 837                 cifs_dbg(VFS,
 838                           "bad cifs.upcall version. Expected %d got %d",
 839                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
 840                 rc = -EKEYREJECTED;
 841                 goto out_put_spnego_key;
 842         }
 843
 844         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
 845                                          GFP_KERNEL);
 846         if (!ses->auth_key.response) {
 847                 cifs_dbg(VFS,
 848                         "Kerberos can't allocate (%u bytes) memory",
 849                         msg->sesskey_len);
 850                 rc = -ENOMEM;
 851                 goto out_put_spnego_key;
 852         }
 853         ses->auth_key.len = msg->sesskey_len;
 854
 855         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
 856         sess_data->iov[1].iov_len = msg->secblob_len;
 857
 858         rc = SMB2_sess_sendreceive(sess_data);
 859         if (rc)
 860                 goto out_put_spnego_key;
 861
 862         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
 863         ses->Suid = rsp->hdr.sync_hdr.SessionId;
 864
 865         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 866
 867         rc = SMB2_sess_establish_session(sess_data);
 868 out_put_spnego_key:
 869         key_invalidate(spnego_key);
 870         key_put(spnego_key);
 871 out:
 872         sess_data->result = rc;
 873         sess_data->func = NULL;
 874         SMB2_sess_free_buffer(sess_data);
 875 }
 876 #else
 877 static void
 878 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
 879 {
 880         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
 881         sess_data->result = -EOPNOTSUPP;
 882         sess_data->func = NULL;
 883 }
 884 #endif
 885
 886 static void
 887 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
 888
 889 static void
 890 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
 891 {
 892         int rc;
 893         struct cifs_ses *ses = sess_data->ses;
 894         struct smb2_sess_setup_rsp *rsp = NULL;
 895         char *ntlmssp_blob = NULL;
 896         bool use_spnego = false; /* else use raw ntlmssp */
 897         u16 blob_length = 0;
 898
 899         /*
 900          * If memory allocation is successful, caller of this function
 901          * frees it.
 902          */
 903         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 904         if (!ses->ntlmssp) {
 905                 rc = -ENOMEM;
 906                 goto out_err;
 907         }
 908         ses->ntlmssp->sesskey_per_smbsess = true;
 909
 910         rc = SMB2_sess_alloc_buffer(sess_data);
 911         if (rc)
 912                 goto out_err;
 913
 914         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 915                                GFP_KERNEL);
 916         if (ntlmssp_blob == NULL) {
 917                 rc = -ENOMEM;
 918                 goto out;
 919         }
 920
 921         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 922         if (use_spnego) {
 923                 /* BB eventually need to add this */
 924                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 925                 rc = -EOPNOTSUPP;
 926                 goto out;
 927         } else {
 928                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 929                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 930         }
 931         sess_data->iov[1].iov_base = ntlmssp_blob;
 932         sess_data->iov[1].iov_len = blob_length;
 933
 934         rc = SMB2_sess_sendreceive(sess_data);
 935         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
 936
 937         /* If true, rc here is expected and not an error */
 938         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
 939                 rsp->hdr.sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
 940                 rc = 0;
 941
 942         if (rc)
 943                 goto out;
 944
 945         if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 946                         le16_to_cpu(rsp->SecurityBufferOffset)) {
 947                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 948                         le16_to_cpu(rsp->SecurityBufferOffset));
 949                 rc = -EIO;
 950                 goto out;
 951         }
 952         rc = decode_ntlmssp_challenge(rsp->Buffer,
 953                         le16_to_cpu(rsp->SecurityBufferLength), ses);
 954         if (rc)
 955                 goto out;
 956
 957         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
 958
 959
 960         ses->Suid = rsp->hdr.sync_hdr.SessionId;
 961         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 962
 963 out:
 964         kfree(ntlmssp_blob);
 965         SMB2_sess_free_buffer(sess_data);
 966         if (!rc) {
 967                 sess_data->result = 0;
 968                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
 969                 return;
 970         }
 971 out_err:
 972         kfree(ses->ntlmssp);
 973         ses->ntlmssp = NULL;
 974         sess_data->result = rc;
 975         sess_data->func = NULL;
 976 }
 977
 978 static void
 979 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
 980 {
 981         int rc;
 982         struct cifs_ses *ses = sess_data->ses;
 983         struct smb2_sess_setup_req *req;
 984         struct smb2_sess_setup_rsp *rsp = NULL;
 985         unsigned char *ntlmssp_blob = NULL;
 986         bool use_spnego = false; /* else use raw ntlmssp */
 987         u16 blob_length = 0;
 988
 989         rc = SMB2_sess_alloc_buffer(sess_data);
 990         if (rc)
 991                 goto out;
 992
 993         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
 994         req->hdr.sync_hdr.SessionId = ses->Suid;
 995
 996         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
 997                                         sess_data->nls_cp);
 998         if (rc) {
 999                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1000                 goto out;
1001         }
1002
1003         if (use_spnego) {
1004                 /* BB eventually need to add this */
1005                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1006                 rc = -EOPNOTSUPP;
1007                 goto out;
1008         }
1009         sess_data->iov[1].iov_base = ntlmssp_blob;
1010         sess_data->iov[1].iov_len = blob_length;
1011
1012         rc = SMB2_sess_sendreceive(sess_data);
1013         if (rc)
1014                 goto out;
1015
1016         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1017
1018         ses->Suid = rsp->hdr.sync_hdr.SessionId;
1019         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1020
1021         rc = SMB2_sess_establish_session(sess_data);
1022 out:
1023         kfree(ntlmssp_blob);
1024         SMB2_sess_free_buffer(sess_data);
1025         kfree(ses->ntlmssp);
1026         ses->ntlmssp = NULL;
1027         sess_data->result = rc;
1028         sess_data->func = NULL;
1029 }
1030
1031 static int
1032 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1033 {
1034         int type;
1035
1036         type = smb2_select_sectype(ses->server, ses->sectype);
1037         cifs_dbg(FYI, "sess setup type %d\n", type);
1038         if (type == Unspecified) {
1039                 cifs_dbg(VFS,
1040                         "Unable to select appropriate authentication method!");
1041                 return -EINVAL;
1042         }
1043
1044         switch (type) {
1045         case Kerberos:
1046                 sess_data->func = SMB2_auth_kerberos;
1047                 break;
1048         case RawNTLMSSP:
1049                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1050                 break;
1051         default:
1052                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1053                 return -EOPNOTSUPP;
1054         }
1055
1056         return 0;
1057 }
1058
1059 int
1060 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1061                 const struct nls_table *nls_cp)
1062 {
1063         int rc = 0;
1064         struct TCP_Server_Info *server = ses->server;
1065         struct SMB2_sess_data *sess_data;
1066
1067         cifs_dbg(FYI, "Session Setup\n");
1068
1069         if (!server) {
1070                 WARN(1, "%s: server is NULL!\n", __func__);
1071                 return -EIO;
1072         }
1073
1074         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1075         if (!sess_data)
1076                 return -ENOMEM;
1077
1078         rc = SMB2_select_sec(ses, sess_data);
1079         if (rc)
1080                 goto out;
1081         sess_data->xid = xid;
1082         sess_data->ses = ses;
1083         sess_data->buf0_type = CIFS_NO_BUFFER;
1084         sess_data->nls_cp = (struct nls_table *) nls_cp;
1085
1086         while (sess_data->func)
1087                 sess_data->func(sess_data);
1088
1089         rc = sess_data->result;
1090 out:
1091         kfree(sess_data);
1092         return rc;
1093 }
1094
1095 int
1096 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1097 {
1098         struct smb2_logoff_req *req; /* response is also trivial struct */
1099         int rc = 0;
1100         struct TCP_Server_Info *server;
1101         int flags = 0;
1102
1103         cifs_dbg(FYI, "disconnect session %p\n", ses);
1104
1105         if (ses && (ses->server))
1106                 server = ses->server;
1107         else
1108                 return -EIO;
1109
1110         /* no need to send SMB logoff if uid already closed due to reconnect */
1111         if (ses->need_reconnect)
1112                 goto smb2_session_already_dead;
1113
1114         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
1115         if (rc)
1116                 return rc;
1117
1118          /* since no tcon, smb2_init can not do this, so do here */
1119         req->hdr.sync_hdr.SessionId = ses->Suid;
1120
1121         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1122                 flags |= CIFS_TRANSFORM_REQ;
1123         else if (server->sign)
1124                 req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1125
1126         rc = SendReceiveNoRsp(xid, ses, (char *) req, flags);
1127         cifs_small_buf_release(req);
1128         /*
1129          * No tcon so can't do
1130          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1131          */
1132
1133 smb2_session_already_dead:
1134         return rc;
1135 }
1136
1137 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1138 {
1139         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1140 }
1141
1142 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1143
1144 /* These are similar values to what Windows uses */
1145 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1146 {
1147         tcon->max_chunks = 256;
1148         tcon->max_bytes_chunk = 1048576;
1149         tcon->max_bytes_copy = 16777216;
1150 }
1151
1152 int
1153 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1154           struct cifs_tcon *tcon, const struct nls_table *cp)
1155 {
1156         struct smb2_tree_connect_req *req;
1157         struct smb2_tree_connect_rsp *rsp = NULL;
1158         struct kvec iov[2];
1159         struct kvec rsp_iov;
1160         int rc = 0;
1161         int resp_buftype;
1162         int unc_path_len;
1163         struct TCP_Server_Info *server;
1164         __le16 *unc_path = NULL;
1165         int flags = 0;
1166
1167         cifs_dbg(FYI, "TCON\n");
1168
1169         if ((ses->server) && tree)
1170                 server = ses->server;
1171         else
1172                 return -EIO;
1173
1174         if (tcon && tcon->bad_network_name)
1175                 return -ENOENT;
1176
1177         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1178         if (unc_path == NULL)
1179                 return -ENOMEM;
1180
1181         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1182         unc_path_len *= 2;
1183         if (unc_path_len < 2) {
1184                 kfree(unc_path);
1185                 return -EINVAL;
1186         }
1187
1188         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1189         if (tcon)
1190                 tcon->tid = 0;
1191
1192         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
1193         if (rc) {
1194                 kfree(unc_path);
1195                 return rc;
1196         }
1197
1198         if (tcon == NULL) {
1199                 if ((ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA))
1200                         flags |= CIFS_TRANSFORM_REQ;
1201
1202                 /* since no tcon, smb2_init can not do this, so do here */
1203                 req->hdr.sync_hdr.SessionId = ses->Suid;
1204                 if (ses->server->sign)
1205                         req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1206         } else if (encryption_required(tcon))
1207                 flags |= CIFS_TRANSFORM_REQ;
1208
1209         iov[0].iov_base = (char *)req;
1210         /* 4 for rfc1002 length field and 1 for pad */
1211         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1212
1213         /* Testing shows that buffer offset must be at location of Buffer[0] */
1214         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1215                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
1216         req->PathLength = cpu_to_le16(unc_path_len - 2);
1217         iov[1].iov_base = unc_path;
1218         iov[1].iov_len = unc_path_len;
1219
1220         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
1221
1222         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
1223         cifs_small_buf_release(req);
1224         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1225
1226         if (rc != 0) {
1227                 if (tcon) {
1228                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1229                         tcon->need_reconnect = true;
1230                 }
1231                 goto tcon_error_exit;
1232         }
1233
1234         if (tcon == NULL) {
1235                 ses->ipc_tid = rsp->hdr.sync_hdr.TreeId;
1236                 goto tcon_exit;
1237         }
1238
1239         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
1240                 cifs_dbg(FYI, "connection to disk share\n");
1241         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
1242                 tcon->ipc = true;
1243                 cifs_dbg(FYI, "connection to pipe share\n");
1244         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
1245                 tcon->print = true;
1246                 cifs_dbg(FYI, "connection to printer\n");
1247         } else {
1248                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1249                 rc = -EOPNOTSUPP;
1250                 goto tcon_error_exit;
1251         }
1252
1253         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1254         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1255         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1256         tcon->tidStatus = CifsGood;
1257         tcon->need_reconnect = false;
1258         tcon->tid = rsp->hdr.sync_hdr.TreeId;
1259         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1260
1261         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1262             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1263                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1264
1265         if (tcon->seal &&
1266             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1267                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1268
1269         init_copy_chunk_defaults(tcon);
1270         if (tcon->ses->server->ops->validate_negotiate)
1271                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1272 tcon_exit:
1273         free_rsp_buf(resp_buftype, rsp);
1274         kfree(unc_path);
1275         return rc;
1276
1277 tcon_error_exit:
1278         if (rsp->hdr.sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1279                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1280                 if (tcon)
1281                         tcon->bad_network_name = true;
1282         }
1283         goto tcon_exit;
1284 }
1285
1286 int
1287 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1288 {
1289         struct smb2_tree_disconnect_req *req; /* response is trivial */
1290         int rc = 0;
1291         struct TCP_Server_Info *server;
1292         struct cifs_ses *ses = tcon->ses;
1293         int flags = 0;
1294
1295         cifs_dbg(FYI, "Tree Disconnect\n");
1296
1297         if (ses && (ses->server))
1298                 server = ses->server;
1299         else
1300                 return -EIO;
1301
1302         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1303                 return 0;
1304
1305         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
1306         if (rc)
1307                 return rc;
1308
1309         if (encryption_required(tcon))
1310                 flags |= CIFS_TRANSFORM_REQ;
1311
1312         rc = SendReceiveNoRsp(xid, ses, (char *)req, flags);
1313         cifs_small_buf_release(req);
1314         if (rc)
1315                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1316
1317         return rc;
1318 }
1319
1320
1321 static struct create_durable *
1322 create_durable_buf(void)
1323 {
1324         struct create_durable *buf;
1325
1326         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1327         if (!buf)
1328                 return NULL;
1329
1330         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1331                                         (struct create_durable, Data));
1332         buf->ccontext.DataLength = cpu_to_le32(16);
1333         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1334                                 (struct create_durable, Name));
1335         buf->ccontext.NameLength = cpu_to_le16(4);
1336         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1337         buf->Name[0] = 'D';
1338         buf->Name[1] = 'H';
1339         buf->Name[2] = 'n';
1340         buf->Name[3] = 'Q';
1341         return buf;
1342 }
1343
1344 static struct create_durable *
1345 create_reconnect_durable_buf(struct cifs_fid *fid)
1346 {
1347         struct create_durable *buf;
1348
1349         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1350         if (!buf)
1351                 return NULL;
1352
1353         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1354                                         (struct create_durable, Data));
1355         buf->ccontext.DataLength = cpu_to_le32(16);
1356         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1357                                 (struct create_durable, Name));
1358         buf->ccontext.NameLength = cpu_to_le16(4);
1359         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1360         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1361         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1362         buf->Name[0] = 'D';
1363         buf->Name[1] = 'H';
1364         buf->Name[2] = 'n';
1365         buf->Name[3] = 'C';
1366         return buf;
1367 }
1368
1369 static __u8
1370 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1371                   unsigned int *epoch)
1372 {
1373         char *data_offset;
1374         struct create_context *cc;
1375         unsigned int next;
1376         unsigned int remaining;
1377         char *name;
1378
1379         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1380         remaining = le32_to_cpu(rsp->CreateContextsLength);
1381         cc = (struct create_context *)data_offset;
1382         while (remaining >= sizeof(struct create_context)) {
1383                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1384                 if (le16_to_cpu(cc->NameLength) == 4 &&
1385                     strncmp(name, "RqLs", 4) == 0)
1386                         return server->ops->parse_lease_buf(cc, epoch);
1387
1388                 next = le32_to_cpu(cc->Next);
1389                 if (!next)
1390                         break;
1391                 remaining -= next;
1392                 cc = (struct create_context *)((char *)cc + next);
1393         }
1394
1395         return 0;
1396 }
1397
1398 static int
1399 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1400                   unsigned int *num_iovec, __u8 *oplock)
1401 {
1402         struct smb2_create_req *req = iov[0].iov_base;
1403         unsigned int num = *num_iovec;
1404
1405         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1406         if (iov[num].iov_base == NULL)
1407                 return -ENOMEM;
1408         iov[num].iov_len = server->vals->create_lease_size;
1409         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1410         if (!req->CreateContextsOffset)
1411                 req->CreateContextsOffset = cpu_to_le32(
1412                                 sizeof(struct smb2_create_req) - 4 +
1413                                 iov[num - 1].iov_len);
1414         le32_add_cpu(&req->CreateContextsLength,
1415                      server->vals->create_lease_size);
1416         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1417         *num_iovec = num + 1;
1418         return 0;
1419 }
1420
1421 static struct create_durable_v2 *
1422 create_durable_v2_buf(struct cifs_fid *pfid)
1423 {
1424         struct create_durable_v2 *buf;
1425
1426         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1427         if (!buf)
1428                 return NULL;
1429
1430         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1431                                         (struct create_durable_v2, dcontext));
1432         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1433         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1434                                 (struct create_durable_v2, Name));
1435         buf->ccontext.NameLength = cpu_to_le16(4);
1436
1437         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1438         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1439         generate_random_uuid(buf->dcontext.CreateGuid);
1440         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1441
1442         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1443         buf->Name[0] = 'D';
1444         buf->Name[1] = 'H';
1445         buf->Name[2] = '2';
1446         buf->Name[3] = 'Q';
1447         return buf;
1448 }
1449
1450 static struct create_durable_handle_reconnect_v2 *
1451 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1452 {
1453         struct create_durable_handle_reconnect_v2 *buf;
1454
1455         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1456                         GFP_KERNEL);
1457         if (!buf)
1458                 return NULL;
1459
1460         buf->ccontext.DataOffset =
1461                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1462                                      dcontext));
1463         buf->ccontext.DataLength =
1464                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1465         buf->ccontext.NameOffset =
1466                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1467                             Name));
1468         buf->ccontext.NameLength = cpu_to_le16(4);
1469
1470         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1471         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1472         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1473         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1474
1475         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1476         buf->Name[0] = 'D';
1477         buf->Name[1] = 'H';
1478         buf->Name[2] = '2';
1479         buf->Name[3] = 'C';
1480         return buf;
1481 }
1482
1483 static int
1484 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1485                     struct cifs_open_parms *oparms)
1486 {
1487         struct smb2_create_req *req = iov[0].iov_base;
1488         unsigned int num = *num_iovec;
1489
1490         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1491         if (iov[num].iov_base == NULL)
1492                 return -ENOMEM;
1493         iov[num].iov_len = sizeof(struct create_durable_v2);
1494         if (!req->CreateContextsOffset)
1495                 req->CreateContextsOffset =
1496                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1497                                                                 iov[1].iov_len);
1498         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1499         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable_v2));
1500         *num_iovec = num + 1;
1501         return 0;
1502 }
1503
1504 static int
1505 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1506                     struct cifs_open_parms *oparms)
1507 {
1508         struct smb2_create_req *req = iov[0].iov_base;
1509         unsigned int num = *num_iovec;
1510
1511         /* indicate that we don't need to relock the file */
1512         oparms->reconnect = false;
1513
1514         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1515         if (iov[num].iov_base == NULL)
1516                 return -ENOMEM;
1517         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1518         if (!req->CreateContextsOffset)
1519                 req->CreateContextsOffset =
1520                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1521                                                                 iov[1].iov_len);
1522         le32_add_cpu(&req->CreateContextsLength,
1523                         sizeof(struct create_durable_handle_reconnect_v2));
1524         inc_rfc1001_len(&req->hdr,
1525                         sizeof(struct create_durable_handle_reconnect_v2));
1526         *num_iovec = num + 1;
1527         return 0;
1528 }
1529
1530 static int
1531 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1532                     struct cifs_open_parms *oparms, bool use_persistent)
1533 {
1534         struct smb2_create_req *req = iov[0].iov_base;
1535         unsigned int num = *num_iovec;
1536
1537         if (use_persistent) {
1538                 if (oparms->reconnect)
1539                         return add_durable_reconnect_v2_context(iov, num_iovec,
1540                                                                 oparms);
1541                 else
1542                         return add_durable_v2_context(iov, num_iovec, oparms);
1543         }
1544
1545         if (oparms->reconnect) {
1546                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1547                 /* indicate that we don't need to relock the file */
1548                 oparms->reconnect = false;
1549         } else
1550                 iov[num].iov_base = create_durable_buf();
1551         if (iov[num].iov_base == NULL)
1552                 return -ENOMEM;
1553         iov[num].iov_len = sizeof(struct create_durable);
1554         if (!req->CreateContextsOffset)
1555                 req->CreateContextsOffset =
1556                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1557                                                                 iov[1].iov_len);
1558         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1559         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1560         *num_iovec = num + 1;
1561         return 0;
1562 }
1563
1564 static int
1565 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1566                             const char *treename, const __le16 *path)
1567 {
1568         int treename_len, path_len;
1569         struct nls_table *cp;
1570         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1571
1572         /*
1573          * skip leading "\\"
1574          */
1575         treename_len = strlen(treename);
1576         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1577                 return -EINVAL;
1578
1579         treename += 2;
1580         treename_len -= 2;
1581
1582         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1583
1584         /*
1585          * make room for one path separator between the treename and
1586          * path
1587          */
1588         *out_len = treename_len + 1 + path_len;
1589
1590         /*
1591          * final path needs to be null-terminated UTF16 with a
1592          * size aligned to 8
1593          */
1594
1595         *out_size = roundup((*out_len+1)*2, 8);
1596         *out_path = kzalloc(*out_size, GFP_KERNEL);
1597         if (!*out_path)
1598                 return -ENOMEM;
1599
1600         cp = load_nls_default();
1601         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1602         UniStrcat(*out_path, sep);
1603         UniStrcat(*out_path, path);
1604         unload_nls(cp);
1605
1606         return 0;
1607 }
1608
1609 int
1610 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1611           __u8 *oplock, struct smb2_file_all_info *buf,
1612           struct smb2_err_rsp **err_buf)
1613 {
1614         struct smb2_create_req *req;
1615         struct smb2_create_rsp *rsp;
1616         struct TCP_Server_Info *server;
1617         struct cifs_tcon *tcon = oparms->tcon;
1618         struct cifs_ses *ses = tcon->ses;
1619         struct kvec iov[4];
1620         struct kvec rsp_iov;
1621         int resp_buftype;
1622         int uni_path_len;
1623         __le16 *copy_path = NULL;
1624         int copy_size;
1625         int rc = 0;
1626         unsigned int n_iov = 2;
1627         __u32 file_attributes = 0;
1628         char *dhc_buf = NULL, *lc_buf = NULL;
1629         int flags = 0;
1630
1631         cifs_dbg(FYI, "create/open\n");
1632
1633         if (ses && (ses->server))
1634                 server = ses->server;
1635         else
1636                 return -EIO;
1637
1638         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1639         if (rc)
1640                 return rc;
1641
1642         if (encryption_required(tcon))
1643                 flags |= CIFS_TRANSFORM_REQ;
1644
1645         if (oparms->create_options & CREATE_OPTION_READONLY)
1646                 file_attributes |= ATTR_READONLY;
1647         if (oparms->create_options & CREATE_OPTION_SPECIAL)
1648                 file_attributes |= ATTR_SYSTEM;
1649
1650         req->ImpersonationLevel = IL_IMPERSONATION;
1651         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1652         /* File attributes ignored on open (used in create though) */
1653         req->FileAttributes = cpu_to_le32(file_attributes);
1654         req->ShareAccess = FILE_SHARE_ALL_LE;
1655         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1656         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1657
1658         iov[0].iov_base = (char *)req;
1659         /* 4 for rfc1002 length field */
1660         iov[0].iov_len = get_rfc1002_length(req) + 4;
1661         /* -1 since last byte is buf[0] which is sent below (path) */
1662         iov[0].iov_len--;
1663
1664         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1665
1666         /* [MS-SMB2] 2.2.13 NameOffset:
1667          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
1668          * the SMB2 header, the file name includes a prefix that will
1669          * be processed during DFS name normalization as specified in
1670          * section 3.3.5.9. Otherwise, the file name is relative to
1671          * the share that is identified by the TreeId in the SMB2
1672          * header.
1673          */
1674         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
1675                 int name_len;
1676
1677                 req->hdr.sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
1678                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
1679                                                  &name_len,
1680                                                  tcon->treeName, path);
1681                 if (rc)
1682                         return rc;
1683                 req->NameLength = cpu_to_le16(name_len * 2);
1684                 uni_path_len = copy_size;
1685                 path = copy_path;
1686         } else {
1687                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1688                 /* MUST set path len (NameLength) to 0 opening root of share */
1689                 req->NameLength = cpu_to_le16(uni_path_len - 2);
1690                 if (uni_path_len % 8 != 0) {
1691                         copy_size = roundup(uni_path_len, 8);
1692                         copy_path = kzalloc(copy_size, GFP_KERNEL);
1693                         if (!copy_path)
1694                                 return -ENOMEM;
1695                         memcpy((char *)copy_path, (const char *)path,
1696                                uni_path_len);
1697                         uni_path_len = copy_size;
1698                         path = copy_path;
1699                 }
1700         }
1701
1702         iov[1].iov_len = uni_path_len;
1703         iov[1].iov_base = path;
1704         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1705         inc_rfc1001_len(req, uni_path_len - 1);
1706
1707         if (!server->oplocks)
1708                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1709
1710         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1711             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1712                 req->RequestedOplockLevel = *oplock;
1713         else {
1714                 rc = add_lease_context(server, iov, &n_iov, oplock);
1715                 if (rc) {
1716                         cifs_small_buf_release(req);
1717                         kfree(copy_path);
1718                         return rc;
1719                 }
1720                 lc_buf = iov[n_iov-1].iov_base;
1721         }
1722
1723         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1724                 /* need to set Next field of lease context if we request it */
1725                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1726                         struct create_context *ccontext =
1727                             (struct create_context *)iov[n_iov-1].iov_base;
1728                         ccontext->Next =
1729                                 cpu_to_le32(server->vals->create_lease_size);
1730                 }
1731
1732                 rc = add_durable_context(iov, &n_iov, oparms,
1733                                         tcon->use_persistent);
1734                 if (rc) {
1735                         cifs_small_buf_release(req);
1736                         kfree(copy_path);
1737                         kfree(lc_buf);
1738                         return rc;
1739                 }
1740                 dhc_buf = iov[n_iov-1].iov_base;
1741         }
1742
1743         rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov);
1744         cifs_small_buf_release(req);
1745         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
1746
1747         if (rc != 0) {
1748                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1749                 if (err_buf)
1750                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1751                                            GFP_KERNEL);
1752                 goto creat_exit;
1753         }
1754
1755         oparms->fid->persistent_fid = rsp->PersistentFileId;
1756         oparms->fid->volatile_fid = rsp->VolatileFileId;
1757
1758         if (buf) {
1759                 memcpy(buf, &rsp->CreationTime, 32);
1760                 buf->AllocationSize = rsp->AllocationSize;
1761                 buf->EndOfFile = rsp->EndofFile;
1762                 buf->Attributes = rsp->FileAttributes;
1763                 buf->NumberOfLinks = cpu_to_le32(1);
1764                 buf->DeletePending = 0;
1765         }
1766
1767         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1768                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1769         else
1770                 *oplock = rsp->OplockLevel;
1771 creat_exit:
1772         kfree(copy_path);
1773         kfree(lc_buf);
1774         kfree(dhc_buf);
1775         free_rsp_buf(resp_buftype, rsp);
1776         return rc;
1777 }
1778
1779 /*
1780  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1781  */
1782 int
1783 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1784            u64 volatile_fid, u32 opcode, bool is_fsctl, bool use_ipc,
1785            char *in_data, u32 indatalen,
1786            char **out_data, u32 *plen /* returned data len */)
1787 {
1788         struct smb2_ioctl_req *req;
1789         struct smb2_ioctl_rsp *rsp;
1790         struct smb2_sync_hdr *shdr;
1791         struct TCP_Server_Info *server;
1792         struct cifs_ses *ses;
1793         struct kvec iov[2];
1794         struct kvec rsp_iov;
1795         int resp_buftype;
1796         int n_iov;
1797         int rc = 0;
1798         int flags = 0;
1799
1800         cifs_dbg(FYI, "SMB2 IOCTL\n");
1801
1802         if (out_data != NULL)
1803                 *out_data = NULL;
1804
1805         /* zero out returned data len, in case of error */
1806         if (plen)
1807                 *plen = 0;
1808
1809         if (tcon)
1810                 ses = tcon->ses;
1811         else
1812                 return -EIO;
1813
1814         if (ses && (ses->server))
1815                 server = ses->server;
1816         else
1817                 return -EIO;
1818
1819         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1820         if (rc)
1821                 return rc;
1822
1823         if (use_ipc) {
1824                 if (ses->ipc_tid == 0) {
1825                         cifs_small_buf_release(req);
1826                         return -ENOTCONN;
1827                 }
1828
1829                 cifs_dbg(FYI, "replacing tid 0x%x with IPC tid 0x%x\n",
1830                          req->hdr.sync_hdr.TreeId, ses->ipc_tid);
1831                 req->hdr.sync_hdr.TreeId = ses->ipc_tid;
1832         }
1833         if (encryption_required(tcon))
1834                 flags |= CIFS_TRANSFORM_REQ;
1835
1836         req->CtlCode = cpu_to_le32(opcode);
1837         req->PersistentFileId = persistent_fid;
1838         req->VolatileFileId = volatile_fid;
1839
1840         if (indatalen) {
1841                 req->InputCount = cpu_to_le32(indatalen);
1842                 /* do not set InputOffset if no input data */
1843                 req->InputOffset =
1844                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1845                 iov[1].iov_base = in_data;
1846                 iov[1].iov_len = indatalen;
1847                 n_iov = 2;
1848         } else
1849                 n_iov = 1;
1850
1851         req->OutputOffset = 0;
1852         req->OutputCount = 0; /* MBZ */
1853
1854         /*
1855          * Could increase MaxOutputResponse, but that would require more
1856          * than one credit. Windows typically sets this smaller, but for some
1857          * ioctls it may be useful to allow server to send more. No point
1858          * limiting what the server can send as long as fits in one credit
1859          */
1860         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1861
1862         if (is_fsctl)
1863                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1864         else
1865                 req->Flags = 0;
1866
1867         iov[0].iov_base = (char *)req;
1868
1869         /*
1870          * If no input data, the size of ioctl struct in
1871          * protocol spec still includes a 1 byte data buffer,
1872          * but if input data passed to ioctl, we do not
1873          * want to double count this, so we do not send
1874          * the dummy one byte of data in iovec[0] if sending
1875          * input data (in iovec[1]). We also must add 4 bytes
1876          * in first iovec to allow for rfc1002 length field.
1877          */
1878
1879         if (indatalen) {
1880                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1881                 inc_rfc1001_len(req, indatalen - 1);
1882         } else
1883                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1884
1885
1886         rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov);
1887         cifs_small_buf_release(req);
1888         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
1889
1890         if ((rc != 0) && (rc != -EINVAL)) {
1891                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1892                 goto ioctl_exit;
1893         } else if (rc == -EINVAL) {
1894                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1895                     (opcode != FSCTL_SRV_COPYCHUNK)) {
1896                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1897                         goto ioctl_exit;
1898                 }
1899         }
1900
1901         /* check if caller wants to look at return data or just return rc */
1902         if ((plen == NULL) || (out_data == NULL))
1903                 goto ioctl_exit;
1904
1905         *plen = le32_to_cpu(rsp->OutputCount);
1906
1907         /* We check for obvious errors in the output buffer length and offset */
1908         if (*plen == 0)
1909                 goto ioctl_exit; /* server returned no data */
1910         else if (*plen > 0xFF00) {
1911                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1912                 *plen = 0;
1913                 rc = -EIO;
1914                 goto ioctl_exit;
1915         }
1916
1917         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1918                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1919                         le32_to_cpu(rsp->OutputOffset));
1920                 *plen = 0;
1921                 rc = -EIO;
1922                 goto ioctl_exit;
1923         }
1924
1925         *out_data = kmalloc(*plen, GFP_KERNEL);
1926         if (*out_data == NULL) {
1927                 rc = -ENOMEM;
1928                 goto ioctl_exit;
1929         }
1930
1931         shdr = get_sync_hdr(rsp);
1932         memcpy(*out_data, (char *)shdr + le32_to_cpu(rsp->OutputOffset), *plen);
1933 ioctl_exit:
1934         free_rsp_buf(resp_buftype, rsp);
1935         return rc;
1936 }
1937
1938 /*
1939  *   Individual callers to ioctl worker function follow
1940  */
1941
1942 int
1943 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1944                      u64 persistent_fid, u64 volatile_fid)
1945 {
1946         int rc;
1947         struct  compress_ioctl fsctl_input;
1948         char *ret_data = NULL;
1949
1950         fsctl_input.CompressionState =
1951                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1952
1953         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1954                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1955                         false /* use_ipc */,
1956                         (char *)&fsctl_input /* data input */,
1957                         2 /* in data len */, &ret_data /* out data */, NULL);
1958
1959         cifs_dbg(FYI, "set compression rc %d\n", rc);
1960
1961         return rc;
1962 }
1963
1964 int
1965 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1966            u64 persistent_fid, u64 volatile_fid)
1967 {
1968         struct smb2_close_req *req;
1969         struct smb2_close_rsp *rsp;
1970         struct TCP_Server_Info *server;
1971         struct cifs_ses *ses = tcon->ses;
1972         struct kvec iov[1];
1973         struct kvec rsp_iov;
1974         int resp_buftype;
1975         int rc = 0;
1976         int flags = 0;
1977
1978         cifs_dbg(FYI, "Close\n");
1979
1980         if (ses && (ses->server))
1981                 server = ses->server;
1982         else
1983                 return -EIO;
1984
1985         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1986         if (rc)
1987                 return rc;
1988
1989         if (encryption_required(tcon))
1990                 flags |= CIFS_TRANSFORM_REQ;
1991
1992         req->PersistentFileId = persistent_fid;
1993         req->VolatileFileId = volatile_fid;
1994
1995         iov[0].iov_base = (char *)req;
1996         /* 4 for rfc1002 length field */
1997         iov[0].iov_len = get_rfc1002_length(req) + 4;
1998
1999         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2000         cifs_small_buf_release(req);
2001         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2002
2003         if (rc != 0) {
2004                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2005                 goto close_exit;
2006         }
2007
2008         /* BB FIXME - decode close response, update inode for caching */
2009
2010 close_exit:
2011         free_rsp_buf(resp_buftype, rsp);
2012         return rc;
2013 }
2014
2015 static int
2016 validate_buf(unsigned int offset, unsigned int buffer_length,
2017              struct smb2_hdr *hdr, unsigned int min_buf_size)
2018
2019 {
2020         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
2021         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
2022         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2023         char *end_of_buf = begin_of_buf + buffer_length;
2024
2025
2026         if (buffer_length < min_buf_size) {
2027                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2028                          buffer_length, min_buf_size);
2029                 return -EINVAL;
2030         }
2031
2032         /* check if beyond RFC1001 maximum length */
2033         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2034                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2035                          buffer_length, smb_len);
2036                 return -EINVAL;
2037         }
2038
2039         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2040                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2041                 return -EINVAL;
2042         }
2043
2044         return 0;
2045 }
2046
2047 /*
2048  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2049  * Caller must free buffer.
2050  */
2051 static int
2052 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
2053                       struct smb2_hdr *hdr, unsigned int minbufsize,
2054                       char *data)
2055
2056 {
2057         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2058         int rc;
2059
2060         if (!data)
2061                 return -EINVAL;
2062
2063         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
2064         if (rc)
2065                 return rc;
2066
2067         memcpy(data, begin_of_buf, buffer_length);
2068
2069         return 0;
2070 }
2071
2072 static int
2073 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2074            u64 persistent_fid, u64 volatile_fid, u8 info_class,
2075            size_t output_len, size_t min_len, void *data)
2076 {
2077         struct smb2_query_info_req *req;
2078         struct smb2_query_info_rsp *rsp = NULL;
2079         struct kvec iov[2];
2080         struct kvec rsp_iov;
2081         int rc = 0;
2082         int resp_buftype;
2083         struct TCP_Server_Info *server;
2084         struct cifs_ses *ses = tcon->ses;
2085         int flags = 0;
2086
2087         cifs_dbg(FYI, "Query Info\n");
2088
2089         if (ses && (ses->server))
2090                 server = ses->server;
2091         else
2092                 return -EIO;
2093
2094         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2095         if (rc)
2096                 return rc;
2097
2098         if (encryption_required(tcon))
2099                 flags |= CIFS_TRANSFORM_REQ;
2100
2101         req->InfoType = SMB2_O_INFO_FILE;
2102         req->FileInfoClass = info_class;
2103         req->PersistentFileId = persistent_fid;
2104         req->VolatileFileId = volatile_fid;
2105         /* 4 for rfc1002 length field and 1 for Buffer */
2106         req->InputBufferOffset =
2107                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2108         req->OutputBufferLength = cpu_to_le32(output_len);
2109
2110         iov[0].iov_base = (char *)req;
2111         /* 4 for rfc1002 length field */
2112         iov[0].iov_len = get_rfc1002_length(req) + 4;
2113
2114         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2115         cifs_small_buf_release(req);
2116         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2117
2118         if (rc) {
2119                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2120                 goto qinf_exit;
2121         }
2122
2123         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
2124                                    le32_to_cpu(rsp->OutputBufferLength),
2125                                    &rsp->hdr, min_len, data);
2126
2127 qinf_exit:
2128         free_rsp_buf(resp_buftype, rsp);
2129         return rc;
2130 }
2131
2132 int
2133 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2134                 u64 persistent_fid, u64 volatile_fid,
2135                 struct smb2_file_all_info *data)
2136 {
2137         return query_info(xid, tcon, persistent_fid, volatile_fid,
2138                           FILE_ALL_INFORMATION,
2139                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2140                           sizeof(struct smb2_file_all_info), data);
2141 }
2142
2143 int
2144 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2145                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2146 {
2147         return query_info(xid, tcon, persistent_fid, volatile_fid,
2148                           FILE_INTERNAL_INFORMATION,
2149                           sizeof(struct smb2_file_internal_info),
2150                           sizeof(struct smb2_file_internal_info), uniqueid);
2151 }
2152
2153 /*
2154  * This is a no-op for now. We're not really interested in the reply, but
2155  * rather in the fact that the server sent one and that server->lstrp
2156  * gets updated.
2157  *
2158  * FIXME: maybe we should consider checking that the reply matches request?
2159  */
2160 static void
2161 smb2_echo_callback(struct mid_q_entry *mid)
2162 {
2163         struct TCP_Server_Info *server = mid->callback_data;
2164         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2165         unsigned int credits_received = 1;
2166
2167         if (mid->mid_state == MID_RESPONSE_RECEIVED)
2168                 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2169
2170         mutex_lock(&server->srv_mutex);
2171         DeleteMidQEntry(mid);
2172         mutex_unlock(&server->srv_mutex);
2173         add_credits(server, credits_received, CIFS_ECHO_OP);
2174 }
2175
2176 void smb2_reconnect_server(struct work_struct *work)
2177 {
2178         struct TCP_Server_Info *server = container_of(work,
2179                                         struct TCP_Server_Info, reconnect.work);
2180         struct cifs_ses *ses;
2181         struct cifs_tcon *tcon, *tcon2;
2182         struct list_head tmp_list;
2183         int tcon_exist = false;
2184
2185         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2186         mutex_lock(&server->reconnect_mutex);
2187
2188         INIT_LIST_HEAD(&tmp_list);
2189         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2190
2191         spin_lock(&cifs_tcp_ses_lock);
2192         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2193                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2194                         if (tcon->need_reconnect || tcon->need_reopen_files) {
2195                                 tcon->tc_count++;
2196                                 list_add_tail(&tcon->rlist, &tmp_list);
2197                                 tcon_exist = true;
2198                         }
2199                 }
2200         }
2201         /*
2202          * Get the reference to server struct to be sure that the last call of
2203          * cifs_put_tcon() in the loop below won't release the server pointer.
2204          */
2205         if (tcon_exist)
2206                 server->srv_count++;
2207
2208         spin_unlock(&cifs_tcp_ses_lock);
2209
2210         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2211                 if (!smb2_reconnect(SMB2_INTERNAL_CMD, tcon))
2212                         cifs_reopen_persistent_handles(tcon);
2213                 list_del_init(&tcon->rlist);
2214                 cifs_put_tcon(tcon);
2215         }
2216
2217         cifs_dbg(FYI, "Reconnecting tcons finished\n");
2218         mutex_unlock(&server->reconnect_mutex);
2219
2220         /* now we can safely release srv struct */
2221         if (tcon_exist)
2222                 cifs_put_tcp_session(server, 1);
2223 }
2224
2225 int
2226 SMB2_echo(struct TCP_Server_Info *server)
2227 {
2228         struct smb2_echo_req *req;
2229         int rc = 0;
2230         struct kvec iov[2];
2231         struct smb_rqst rqst = { .rq_iov = iov,
2232                                  .rq_nvec = 2 };
2233
2234         cifs_dbg(FYI, "In echo request\n");
2235
2236         if (server->tcpStatus == CifsNeedNegotiate) {
2237                 /* No need to send echo on newly established connections */
2238                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2239                 return rc;
2240         }
2241
2242         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
2243         if (rc)
2244                 return rc;
2245
2246         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
2247
2248         /* 4 for rfc1002 length field */
2249         iov[0].iov_len = 4;
2250         iov[0].iov_base = (char *)req;
2251         iov[1].iov_len = get_rfc1002_length(req);
2252         iov[1].iov_base = (char *)req + 4;
2253
2254         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2255                              server, CIFS_ECHO_OP);
2256         if (rc)
2257                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2258
2259         cifs_small_buf_release(req);
2260         return rc;
2261 }
2262
2263 int
2264 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2265            u64 volatile_fid)
2266 {
2267         struct smb2_flush_req *req;
2268         struct TCP_Server_Info *server;
2269         struct cifs_ses *ses = tcon->ses;
2270         struct kvec iov[1];
2271         struct kvec rsp_iov;
2272         int resp_buftype;
2273         int rc = 0;
2274         int flags = 0;
2275
2276         cifs_dbg(FYI, "Flush\n");
2277
2278         if (ses && (ses->server))
2279                 server = ses->server;
2280         else
2281                 return -EIO;
2282
2283         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
2284         if (rc)
2285                 return rc;
2286
2287         if (encryption_required(tcon))
2288                 flags |= CIFS_TRANSFORM_REQ;
2289
2290         req->PersistentFileId = persistent_fid;
2291         req->VolatileFileId = volatile_fid;
2292
2293         iov[0].iov_base = (char *)req;
2294         /* 4 for rfc1002 length field */
2295         iov[0].iov_len = get_rfc1002_length(req) + 4;
2296
2297         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2298         cifs_small_buf_release(req);
2299
2300         if (rc != 0)
2301                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2302
2303         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2304         return rc;
2305 }
2306
2307 /*
2308  * To form a chain of read requests, any read requests after the first should
2309  * have the end_of_chain boolean set to true.
2310  */
2311 static int
2312 smb2_new_read_req(void **buf, unsigned int *total_len,
2313                   struct cifs_io_parms *io_parms, unsigned int remaining_bytes,
2314                   int request_type)
2315 {
2316         int rc = -EACCES;
2317         struct smb2_read_plain_req *req = NULL;
2318         struct smb2_sync_hdr *shdr;
2319
2320         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2321                                  total_len);
2322         if (rc)
2323                 return rc;
2324         if (io_parms->tcon->ses->server == NULL)
2325                 return -ECONNABORTED;
2326
2327         shdr = &req->sync_hdr;
2328         shdr->ProcessId = cpu_to_le32(io_parms->pid);
2329
2330         req->PersistentFileId = io_parms->persistent_fid;
2331         req->VolatileFileId = io_parms->volatile_fid;
2332         req->ReadChannelInfoOffset = 0; /* reserved */
2333         req->ReadChannelInfoLength = 0; /* reserved */
2334         req->Channel = 0; /* reserved */
2335         req->MinimumCount = 0;
2336         req->Length = cpu_to_le32(io_parms->length);
2337         req->Offset = cpu_to_le64(io_parms->offset);
2338
2339         if (request_type & CHAINED_REQUEST) {
2340                 if (!(request_type & END_OF_CHAIN)) {
2341                         /* next 8-byte aligned request */
2342                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
2343                         shdr->NextCommand = cpu_to_le32(*total_len);
2344                 } else /* END_OF_CHAIN */
2345                         shdr->NextCommand = 0;
2346                 if (request_type & RELATED_REQUEST) {
2347                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2348                         /*
2349                          * Related requests use info from previous read request
2350                          * in chain.
2351                          */
2352                         shdr->SessionId = 0xFFFFFFFF;
2353                         shdr->TreeId = 0xFFFFFFFF;
2354                         req->PersistentFileId = 0xFFFFFFFF;
2355                         req->VolatileFileId = 0xFFFFFFFF;
2356                 }
2357         }
2358         if (remaining_bytes > io_parms->length)
2359                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
2360         else
2361                 req->RemainingBytes = 0;
2362
2363         *buf = req;
2364         return rc;
2365 }
2366
2367 static void
2368 smb2_readv_callback(struct mid_q_entry *mid)
2369 {
2370         struct cifs_readdata *rdata = mid->callback_data;
2371         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
2372         struct TCP_Server_Info *server = tcon->ses->server;
2373         struct smb2_sync_hdr *shdr =
2374                                 (struct smb2_sync_hdr *)rdata->iov[1].iov_base;
2375         unsigned int credits_received = 1;
2376         struct smb_rqst rqst = { .rq_iov = rdata->iov,
2377                                  .rq_nvec = 2,
2378                                  .rq_pages = rdata->pages,
2379                                  .rq_npages = rdata->nr_pages,
2380                                  .rq_pagesz = rdata->pagesz,
2381                                  .rq_tailsz = rdata->tailsz };
2382
2383         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
2384                  __func__, mid->mid, mid->mid_state, rdata->result,
2385                  rdata->bytes);
2386
2387         switch (mid->mid_state) {
2388         case MID_RESPONSE_RECEIVED:
2389                 credits_received = le16_to_cpu(shdr->CreditRequest);
2390                 /* result already set, check signature */
2391                 if (server->sign && !mid->decrypted) {
2392                         int rc;
2393
2394                         rc = smb2_verify_signature(&rqst, server);
2395                         if (rc)
2396                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
2397                                          rc);
2398                 }
2399                 /* FIXME: should this be counted toward the initiating task? */
2400                 task_io_account_read(rdata->got_bytes);
2401                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2402                 break;
2403         case MID_REQUEST_SUBMITTED:
2404         case MID_RETRY_NEEDED:
2405                 rdata->result = -EAGAIN;
2406                 if (server->sign && rdata->got_bytes)
2407                         /* reset bytes number since we can not check a sign */
2408                         rdata->got_bytes = 0;
2409                 /* FIXME: should this be counted toward the initiating task? */
2410                 task_io_account_read(rdata->got_bytes);
2411                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2412                 break;
2413         default:
2414                 if (rdata->result != -ENODATA)
2415                         rdata->result = -EIO;
2416         }
2417
2418         if (rdata->result)
2419                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
2420
2421         queue_work(cifsiod_wq, &rdata->work);
2422         mutex_lock(&server->srv_mutex);
2423         DeleteMidQEntry(mid);
2424         mutex_unlock(&server->srv_mutex);
2425         add_credits(server, credits_received, 0);
2426 }
2427
2428 /* smb2_async_readv - send an async read, and set up mid to handle result */
2429 int
2430 smb2_async_readv(struct cifs_readdata *rdata)
2431 {
2432         int rc, flags = 0;
2433         char *buf;
2434         struct smb2_sync_hdr *shdr;
2435         struct cifs_io_parms io_parms;
2436         struct smb_rqst rqst = { .rq_iov = rdata->iov,
2437                                  .rq_nvec = 2 };
2438         struct TCP_Server_Info *server;
2439         unsigned int total_len;
2440         __be32 req_len;
2441
2442         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
2443                  __func__, rdata->offset, rdata->bytes);
2444
2445         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
2446         io_parms.offset = rdata->offset;
2447         io_parms.length = rdata->bytes;
2448         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
2449         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
2450         io_parms.pid = rdata->pid;
2451
2452         server = io_parms.tcon->ses->server;
2453
2454         rc = smb2_new_read_req((void **) &buf, &total_len, &io_parms, 0, 0);
2455         if (rc) {
2456                 if (rc == -EAGAIN && rdata->credits) {
2457                         /* credits was reset by reconnect */
2458                         rdata->credits = 0;
2459                         /* reduce in_flight value since we won't send the req */
2460                         spin_lock(&server->req_lock);
2461                         server->in_flight--;
2462                         spin_unlock(&server->req_lock);
2463                 }
2464                 return rc;
2465         }
2466
2467         if (encryption_required(io_parms.tcon))
2468                 flags |= CIFS_TRANSFORM_REQ;
2469
2470         req_len = cpu_to_be32(total_len);
2471
2472         rdata->iov[0].iov_base = &req_len;
2473         rdata->iov[0].iov_len = sizeof(__be32);
2474         rdata->iov[1].iov_base = buf;
2475         rdata->iov[1].iov_len = total_len;
2476
2477         shdr = (struct smb2_sync_hdr *)buf;
2478
2479         if (rdata->credits) {
2480                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2481                                                 SMB2_MAX_BUFFER_SIZE));
2482                 shdr->CreditRequest = shdr->CreditCharge;
2483                 spin_lock(&server->req_lock);
2484                 server->credits += rdata->credits -
2485                                                 le16_to_cpu(shdr->CreditCharge);
2486                 spin_unlock(&server->req_lock);
2487                 wake_up(&server->request_q);
2488                 flags |= CIFS_HAS_CREDITS;
2489         }
2490
2491         kref_get(&rdata->refcount);
2492         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2493                              cifs_readv_receive, smb2_readv_callback,
2494                              smb3_handle_read_data, rdata, flags);
2495         if (rc) {
2496                 kref_put(&rdata->refcount, cifs_readdata_release);
2497                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
2498         }
2499
2500         cifs_small_buf_release(buf);
2501         return rc;
2502 }
2503
2504 int
2505 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
2506           unsigned int *nbytes, char **buf, int *buf_type)
2507 {
2508         int resp_buftype, rc = -EACCES;
2509         struct smb2_read_plain_req *req = NULL;
2510         struct smb2_read_rsp *rsp = NULL;
2511         struct smb2_sync_hdr *shdr;
2512         struct kvec iov[2];
2513         struct kvec rsp_iov;
2514         unsigned int total_len;
2515         __be32 req_len;
2516         struct smb_rqst rqst = { .rq_iov = iov,
2517                                  .rq_nvec = 2 };
2518         int flags = CIFS_LOG_ERROR;
2519         struct cifs_ses *ses = io_parms->tcon->ses;
2520
2521         *nbytes = 0;
2522         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, 0, 0);
2523         if (rc)
2524                 return rc;
2525
2526         if (encryption_required(io_parms->tcon))
2527                 flags |= CIFS_TRANSFORM_REQ;
2528
2529         req_len = cpu_to_be32(total_len);
2530
2531         iov[0].iov_base = &req_len;
2532         iov[0].iov_len = sizeof(__be32);
2533         iov[1].iov_base = req;
2534         iov[1].iov_len = total_len;
2535
2536         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2537         cifs_small_buf_release(req);
2538
2539         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
2540         shdr = get_sync_hdr(rsp);
2541
2542         if (shdr->Status == STATUS_END_OF_FILE) {
2543                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2544                 return 0;
2545         }
2546
2547         if (rc) {
2548                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2549                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
2550         } else {
2551                 *nbytes = le32_to_cpu(rsp->DataLength);
2552                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
2553                     (*nbytes > io_parms->length)) {
2554                         cifs_dbg(FYI, "bad length %d for count %d\n",
2555                                  *nbytes, io_parms->length);
2556                         rc = -EIO;
2557                         *nbytes = 0;
2558                 }
2559         }
2560
2561         if (*buf) {
2562                 memcpy(*buf, (char *)shdr + rsp->DataOffset, *nbytes);
2563                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2564         } else if (resp_buftype != CIFS_NO_BUFFER) {
2565                 *buf = rsp_iov.iov_base;
2566                 if (resp_buftype == CIFS_SMALL_BUFFER)
2567                         *buf_type = CIFS_SMALL_BUFFER;
2568                 else if (resp_buftype == CIFS_LARGE_BUFFER)
2569                         *buf_type = CIFS_LARGE_BUFFER;
2570         }
2571         return rc;
2572 }
2573
2574 /*
2575  * Check the mid_state and signature on received buffer (if any), and queue the
2576  * workqueue completion task.
2577  */
2578 static void
2579 smb2_writev_callback(struct mid_q_entry *mid)
2580 {
2581         struct cifs_writedata *wdata = mid->callback_data;
2582         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2583         struct TCP_Server_Info *server = tcon->ses->server;
2584         unsigned int written;
2585         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
2586         unsigned int credits_received = 1;
2587
2588         switch (mid->mid_state) {
2589         case MID_RESPONSE_RECEIVED:
2590                 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2591                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
2592                 if (wdata->result != 0)
2593                         break;
2594
2595                 written = le32_to_cpu(rsp->DataLength);
2596                 /*
2597                  * Mask off high 16 bits when bytes written as returned
2598                  * by the server is greater than bytes requested by the
2599                  * client. OS/2 servers are known to set incorrect
2600                  * CountHigh values.
2601                  */
2602                 if (written > wdata->bytes)
2603                         written &= 0xFFFF;
2604
2605                 if (written < wdata->bytes)
2606                         wdata->result = -ENOSPC;
2607                 else
2608                         wdata->bytes = written;
2609                 break;
2610         case MID_REQUEST_SUBMITTED:
2611         case MID_RETRY_NEEDED:
2612                 wdata->result = -EAGAIN;
2613                 break;
2614         default:
2615                 wdata->result = -EIO;
2616                 break;
2617         }
2618
2619         if (wdata->result)
2620                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2621
2622         queue_work(cifsiod_wq, &wdata->work);
2623         mutex_lock(&server->srv_mutex);
2624         DeleteMidQEntry(mid);
2625         mutex_unlock(&server->srv_mutex);
2626         add_credits(tcon->ses->server, credits_received, 0);
2627 }
2628
2629 /* smb2_async_writev - send an async write, and set up mid to handle result */
2630 int
2631 smb2_async_writev(struct cifs_writedata *wdata,
2632                   void (*release)(struct kref *kref))
2633 {
2634         int rc = -EACCES, flags = 0;
2635         struct smb2_write_req *req = NULL;
2636         struct smb2_sync_hdr *shdr;
2637         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2638         struct TCP_Server_Info *server = tcon->ses->server;
2639         struct kvec iov[2];
2640         struct smb_rqst rqst = { };
2641
2642         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
2643         if (rc) {
2644                 if (rc == -EAGAIN && wdata->credits) {
2645                         /* credits was reset by reconnect */
2646                         wdata->credits = 0;
2647                         /* reduce in_flight value since we won't send the req */
2648                         spin_lock(&server->req_lock);
2649                         server->in_flight--;
2650                         spin_unlock(&server->req_lock);
2651                 }
2652                 goto async_writev_out;
2653         }
2654
2655         if (encryption_required(tcon))
2656                 flags |= CIFS_TRANSFORM_REQ;
2657
2658         shdr = get_sync_hdr(req);
2659         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
2660
2661         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
2662         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
2663         req->WriteChannelInfoOffset = 0;
2664         req->WriteChannelInfoLength = 0;
2665         req->Channel = 0;
2666         req->Offset = cpu_to_le64(wdata->offset);
2667         /* 4 for rfc1002 length field */
2668         req->DataOffset = cpu_to_le16(
2669                                 offsetof(struct smb2_write_req, Buffer) - 4);
2670         req->RemainingBytes = 0;
2671
2672         /* 4 for rfc1002 length field and 1 for Buffer */
2673         iov[0].iov_len = 4;
2674         iov[0].iov_base = req;
2675         iov[1].iov_len = get_rfc1002_length(req) - 1;
2676         iov[1].iov_base = (char *)req + 4;
2677
2678         rqst.rq_iov = iov;
2679         rqst.rq_nvec = 2;
2680         rqst.rq_pages = wdata->pages;
2681         rqst.rq_npages = wdata->nr_pages;
2682         rqst.rq_pagesz = wdata->pagesz;
2683         rqst.rq_tailsz = wdata->tailsz;
2684
2685         cifs_dbg(FYI, "async write at %llu %u bytes\n",
2686                  wdata->offset, wdata->bytes);
2687
2688         req->Length = cpu_to_le32(wdata->bytes);
2689
2690         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
2691
2692         if (wdata->credits) {
2693                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2694                                                     SMB2_MAX_BUFFER_SIZE));
2695                 shdr->CreditRequest = shdr->CreditCharge;
2696                 spin_lock(&server->req_lock);
2697                 server->credits += wdata->credits -
2698                                                 le16_to_cpu(shdr->CreditCharge);
2699                 spin_unlock(&server->req_lock);
2700                 wake_up(&server->request_q);
2701                 flags |= CIFS_HAS_CREDITS;
2702         }
2703
2704         kref_get(&wdata->refcount);
2705         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
2706                              wdata, flags);
2707
2708         if (rc) {
2709                 kref_put(&wdata->refcount, release);
2710                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2711         }
2712
2713 async_writev_out:
2714         cifs_small_buf_release(req);
2715         return rc;
2716 }
2717
2718 /*
2719  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
2720  * The length field from io_parms must be at least 1 and indicates a number of
2721  * elements with data to write that begins with position 1 in iov array. All
2722  * data length is specified by count.
2723  */
2724 int
2725 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
2726            unsigned int *nbytes, struct kvec *iov, int n_vec)
2727 {
2728         int rc = 0;
2729         struct smb2_write_req *req = NULL;
2730         struct smb2_write_rsp *rsp = NULL;
2731         int resp_buftype;
2732         struct kvec rsp_iov;
2733         int flags = 0;
2734
2735         *nbytes = 0;
2736
2737         if (n_vec < 1)
2738                 return rc;
2739
2740         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
2741         if (rc)
2742                 return rc;
2743
2744         if (io_parms->tcon->ses->server == NULL)
2745                 return -ECONNABORTED;
2746
2747         if (encryption_required(io_parms->tcon))
2748                 flags |= CIFS_TRANSFORM_REQ;
2749
2750         req->hdr.sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
2751
2752         req->PersistentFileId = io_parms->persistent_fid;
2753         req->VolatileFileId = io_parms->volatile_fid;
2754         req->WriteChannelInfoOffset = 0;
2755         req->WriteChannelInfoLength = 0;
2756         req->Channel = 0;
2757         req->Length = cpu_to_le32(io_parms->length);
2758         req->Offset = cpu_to_le64(io_parms->offset);
2759         /* 4 for rfc1002 length field */
2760         req->DataOffset = cpu_to_le16(
2761                                 offsetof(struct smb2_write_req, Buffer) - 4);
2762         req->RemainingBytes = 0;
2763
2764         iov[0].iov_base = (char *)req;
2765         /* 4 for rfc1002 length field and 1 for Buffer */
2766         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2767
2768         /* length of entire message including data to be written */
2769         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2770
2771         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2772                           &resp_buftype, flags, &rsp_iov);
2773         cifs_small_buf_release(req);
2774         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
2775
2776         if (rc) {
2777                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2778                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2779         } else
2780                 *nbytes = le32_to_cpu(rsp->DataLength);
2781
2782         free_rsp_buf(resp_buftype, rsp);
2783         return rc;
2784 }
2785
2786 static unsigned int
2787 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2788 {
2789         int len;
2790         unsigned int entrycount = 0;
2791         unsigned int next_offset = 0;
2792         FILE_DIRECTORY_INFO *entryptr;
2793
2794         if (bufstart == NULL)
2795                 return 0;
2796
2797         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2798
2799         while (1) {
2800                 entryptr = (FILE_DIRECTORY_INFO *)
2801                                         ((char *)entryptr + next_offset);
2802
2803                 if ((char *)entryptr + size > end_of_buf) {
2804                         cifs_dbg(VFS, "malformed search entry would overflow\n");
2805                         break;
2806                 }
2807
2808                 len = le32_to_cpu(entryptr->FileNameLength);
2809                 if ((char *)entryptr + len + size > end_of_buf) {
2810                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2811                                  end_of_buf);
2812                         break;
2813                 }
2814
2815                 *lastentry = (char *)entryptr;
2816                 entrycount++;
2817
2818                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2819                 if (!next_offset)
2820                         break;
2821         }
2822
2823         return entrycount;
2824 }
2825
2826 /*
2827  * Readdir/FindFirst
2828  */
2829 int
2830 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2831                      u64 persistent_fid, u64 volatile_fid, int index,
2832                      struct cifs_search_info *srch_inf)
2833 {
2834         struct smb2_query_directory_req *req;
2835         struct smb2_query_directory_rsp *rsp = NULL;
2836         struct kvec iov[2];
2837         struct kvec rsp_iov;
2838         int rc = 0;
2839         int len;
2840         int resp_buftype = CIFS_NO_BUFFER;
2841         unsigned char *bufptr;
2842         struct TCP_Server_Info *server;
2843         struct cifs_ses *ses = tcon->ses;
2844         __le16 asteriks = cpu_to_le16('*');
2845         char *end_of_smb;
2846         unsigned int output_size = CIFSMaxBufSize;
2847         size_t info_buf_size;
2848         int flags = 0;
2849
2850         if (ses && (ses->server))
2851                 server = ses->server;
2852         else
2853                 return -EIO;
2854
2855         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2856         if (rc)
2857                 return rc;
2858
2859         if (encryption_required(tcon))
2860                 flags |= CIFS_TRANSFORM_REQ;
2861
2862         switch (srch_inf->info_level) {
2863         case SMB_FIND_FILE_DIRECTORY_INFO:
2864                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2865                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2866                 break;
2867         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2868                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2869                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2870                 break;
2871         default:
2872                 cifs_dbg(VFS, "info level %u isn't supported\n",
2873                          srch_inf->info_level);
2874                 rc = -EINVAL;
2875                 goto qdir_exit;
2876         }
2877
2878         req->FileIndex = cpu_to_le32(index);
2879         req->PersistentFileId = persistent_fid;
2880         req->VolatileFileId = volatile_fid;
2881
2882         len = 0x2;
2883         bufptr = req->Buffer;
2884         memcpy(bufptr, &asteriks, len);
2885
2886         req->FileNameOffset =
2887                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2888         req->FileNameLength = cpu_to_le16(len);
2889         /*
2890          * BB could be 30 bytes or so longer if we used SMB2 specific
2891          * buffer lengths, but this is safe and close enough.
2892          */
2893         output_size = min_t(unsigned int, output_size, server->maxBuf);
2894         output_size = min_t(unsigned int, output_size, 2 << 15);
2895         req->OutputBufferLength = cpu_to_le32(output_size);
2896
2897         iov[0].iov_base = (char *)req;
2898         /* 4 for RFC1001 length and 1 for Buffer */
2899         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2900
2901         iov[1].iov_base = (char *)(req->Buffer);
2902         iov[1].iov_len = len;
2903
2904         inc_rfc1001_len(req, len - 1 /* Buffer */);
2905
2906         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
2907         cifs_small_buf_release(req);
2908         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
2909
2910         if (rc) {
2911                 if (rc == -ENODATA &&
2912                     rsp->hdr.sync_hdr.Status == STATUS_NO_MORE_FILES) {
2913                         srch_inf->endOfSearch = true;
2914                         rc = 0;
2915                 }
2916                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2917                 goto qdir_exit;
2918         }
2919
2920         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2921                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2922                           info_buf_size);
2923         if (rc)
2924                 goto qdir_exit;
2925
2926         srch_inf->unicode = true;
2927
2928         if (srch_inf->ntwrk_buf_start) {
2929                 if (srch_inf->smallBuf)
2930                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2931                 else
2932                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2933         }
2934         srch_inf->ntwrk_buf_start = (char *)rsp;
2935         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2936                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2937         /* 4 for rfc1002 length field */
2938         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2939         srch_inf->entries_in_buffer =
2940                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2941                                     &srch_inf->last_entry, info_buf_size);
2942         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2943         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2944                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2945                  srch_inf->srch_entries_start, srch_inf->last_entry);
2946         if (resp_buftype == CIFS_LARGE_BUFFER)
2947                 srch_inf->smallBuf = false;
2948         else if (resp_buftype == CIFS_SMALL_BUFFER)
2949                 srch_inf->smallBuf = true;
2950         else
2951                 cifs_dbg(VFS, "illegal search buffer type\n");
2952
2953         return rc;
2954
2955 qdir_exit:
2956         free_rsp_buf(resp_buftype, rsp);
2957         return rc;
2958 }
2959
2960 static int
2961 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2962                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2963                unsigned int num, void **data, unsigned int *size)
2964 {
2965         struct smb2_set_info_req *req;
2966         struct smb2_set_info_rsp *rsp = NULL;
2967         struct kvec *iov;
2968         struct kvec rsp_iov;
2969         int rc = 0;
2970         int resp_buftype;
2971         unsigned int i;
2972         struct TCP_Server_Info *server;
2973         struct cifs_ses *ses = tcon->ses;
2974         int flags = 0;
2975
2976         if (ses && (ses->server))
2977                 server = ses->server;
2978         else
2979                 return -EIO;
2980
2981         if (!num)
2982                 return -EINVAL;
2983
2984         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2985         if (!iov)
2986                 return -ENOMEM;
2987
2988         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2989         if (rc) {
2990                 kfree(iov);
2991                 return rc;
2992         }
2993
2994         if (encryption_required(tcon))
2995                 flags |= CIFS_TRANSFORM_REQ;
2996
2997         req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
2998
2999         req->InfoType = SMB2_O_INFO_FILE;
3000         req->FileInfoClass = info_class;
3001         req->PersistentFileId = persistent_fid;
3002         req->VolatileFileId = volatile_fid;
3003
3004         /* 4 for RFC1001 length and 1 for Buffer */
3005         req->BufferOffset =
3006                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
3007         req->BufferLength = cpu_to_le32(*size);
3008
3009         inc_rfc1001_len(req, *size - 1 /* Buffer */);
3010
3011         memcpy(req->Buffer, *data, *size);
3012
3013         iov[0].iov_base = (char *)req;
3014         /* 4 for RFC1001 length */
3015         iov[0].iov_len = get_rfc1002_length(req) + 4;
3016
3017         for (i = 1; i < num; i++) {
3018                 inc_rfc1001_len(req, size[i]);
3019                 le32_add_cpu(&req->BufferLength, size[i]);
3020                 iov[i].iov_base = (char *)data[i];
3021                 iov[i].iov_len = size[i];
3022         }
3023
3024         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, flags, &rsp_iov);
3025         cifs_small_buf_release(req);
3026         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3027
3028         if (rc != 0)
3029                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3030
3031         free_rsp_buf(resp_buftype, rsp);
3032         kfree(iov);
3033         return rc;
3034 }
3035
3036 int
3037 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
3038             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3039 {
3040         struct smb2_file_rename_info info;
3041         void **data;
3042         unsigned int size[2];
3043         int rc;
3044         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3045
3046         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3047         if (!data)
3048                 return -ENOMEM;
3049
3050         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
3051                               /* 0 = fail if target already exists */
3052         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3053         info.FileNameLength = cpu_to_le32(len);
3054
3055         data[0] = &info;
3056         size[0] = sizeof(struct smb2_file_rename_info);
3057
3058         data[1] = target_file;
3059         size[1] = len + 2 /* null */;
3060
3061         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3062                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
3063                            size);
3064         kfree(data);
3065         return rc;
3066 }
3067
3068 int
3069 SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
3070                   u64 persistent_fid, u64 volatile_fid)
3071 {
3072         __u8 delete_pending = 1;
3073         void *data;
3074         unsigned int size;
3075
3076         data = &delete_pending;
3077         size = 1; /* sizeof __u8 */
3078
3079         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3080                         current->tgid, FILE_DISPOSITION_INFORMATION, 1, &data,
3081                         &size);
3082 }
3083
3084 int
3085 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
3086                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3087 {
3088         struct smb2_file_link_info info;
3089         void **data;
3090         unsigned int size[2];
3091         int rc;
3092         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3093
3094         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3095         if (!data)
3096                 return -ENOMEM;
3097
3098         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
3099                               /* 0 = fail if link already exists */
3100         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3101         info.FileNameLength = cpu_to_le32(len);
3102
3103         data[0] = &info;
3104         size[0] = sizeof(struct smb2_file_link_info);
3105
3106         data[1] = target_file;
3107         size[1] = len + 2 /* null */;
3108
3109         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3110                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
3111         kfree(data);
3112         return rc;
3113 }
3114
3115 int
3116 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3117              u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
3118 {
3119         struct smb2_file_eof_info info;
3120         void *data;
3121         unsigned int size;
3122
3123         info.EndOfFile = *eof;
3124
3125         data = &info;
3126         size = sizeof(struct smb2_file_eof_info);
3127
3128         if (is_falloc)
3129                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3130                         pid, FILE_ALLOCATION_INFORMATION, 1, &data, &size);
3131         else
3132                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3133                         pid, FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
3134 }
3135
3136 int
3137 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3138               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
3139 {
3140         unsigned int size;
3141         size = sizeof(FILE_BASIC_INFO);
3142         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3143                              current->tgid, FILE_BASIC_INFORMATION, 1,
3144                              (void **)&buf, &size);
3145 }
3146
3147 int
3148 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3149                   const u64 persistent_fid, const u64 volatile_fid,
3150                   __u8 oplock_level)
3151 {
3152         int rc;
3153         struct smb2_oplock_break *req = NULL;
3154         int flags = CIFS_OBREAK_OP;
3155
3156         cifs_dbg(FYI, "SMB2_oplock_break\n");
3157         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
3158         if (rc)
3159                 return rc;
3160
3161         if (encryption_required(tcon))
3162                 flags |= CIFS_TRANSFORM_REQ;
3163
3164         req->VolatileFid = volatile_fid;
3165         req->PersistentFid = persistent_fid;
3166         req->OplockLevel = oplock_level;
3167         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
3168
3169         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
3170         cifs_small_buf_release(req);
3171
3172         if (rc) {
3173                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3174                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3175         }
3176
3177         return rc;
3178 }
3179
3180 static void
3181 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
3182                         struct kstatfs *kst)
3183 {
3184         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
3185                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
3186         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
3187         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
3188         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3189         return;
3190 }
3191
3192 static int
3193 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
3194                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
3195 {
3196         int rc;
3197         struct smb2_query_info_req *req;
3198
3199         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
3200
3201         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
3202                 return -EIO;
3203
3204         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
3205         if (rc)
3206                 return rc;
3207
3208         req->InfoType = SMB2_O_INFO_FILESYSTEM;
3209         req->FileInfoClass = level;
3210         req->PersistentFileId = persistent_fid;
3211         req->VolatileFileId = volatile_fid;
3212         /* 4 for rfc1002 length field and 1 for pad */
3213         req->InputBufferOffset =
3214                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
3215         req->OutputBufferLength = cpu_to_le32(
3216                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
3217
3218         iov->iov_base = (char *)req;
3219         /* 4 for rfc1002 length field */
3220         iov->iov_len = get_rfc1002_length(req) + 4;
3221         return 0;
3222 }
3223
3224 int
3225 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
3226               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
3227 {
3228         struct smb2_query_info_rsp *rsp = NULL;
3229         struct kvec iov;
3230         struct kvec rsp_iov;
3231         int rc = 0;
3232         int resp_buftype;
3233         struct cifs_ses *ses = tcon->ses;
3234         struct smb2_fs_full_size_info *info = NULL;
3235         int flags = 0;
3236
3237         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
3238                                 sizeof(struct smb2_fs_full_size_info),
3239                                 persistent_fid, volatile_fid);
3240         if (rc)
3241                 return rc;
3242
3243         if (encryption_required(tcon))
3244                 flags |= CIFS_TRANSFORM_REQ;
3245
3246         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3247         cifs_small_buf_release(iov.iov_base);
3248         if (rc) {
3249                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3250                 goto qfsinf_exit;
3251         }
3252         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3253
3254         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
3255                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
3256         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
3257                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
3258                           sizeof(struct smb2_fs_full_size_info));
3259         if (!rc)
3260                 copy_fs_info_to_kstatfs(info, fsdata);
3261
3262 qfsinf_exit:
3263         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3264         return rc;
3265 }
3266
3267 int
3268 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
3269               u64 persistent_fid, u64 volatile_fid, int level)
3270 {
3271         struct smb2_query_info_rsp *rsp = NULL;
3272         struct kvec iov;
3273         struct kvec rsp_iov;
3274         int rc = 0;
3275         int resp_buftype, max_len, min_len;
3276         struct cifs_ses *ses = tcon->ses;
3277         unsigned int rsp_len, offset;
3278         int flags = 0;
3279
3280         if (level == FS_DEVICE_INFORMATION) {
3281                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3282                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3283         } else if (level == FS_ATTRIBUTE_INFORMATION) {
3284                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
3285                 min_len = MIN_FS_ATTR_INFO_SIZE;
3286         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
3287                 max_len = sizeof(struct smb3_fs_ss_info);
3288                 min_len = sizeof(struct smb3_fs_ss_info);
3289         } else {
3290                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
3291                 return -EINVAL;
3292         }
3293
3294         rc = build_qfs_info_req(&iov, tcon, level, max_len,
3295                                 persistent_fid, volatile_fid);
3296         if (rc)
3297                 return rc;
3298
3299         if (encryption_required(tcon))
3300                 flags |= CIFS_TRANSFORM_REQ;
3301
3302         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3303         cifs_small_buf_release(iov.iov_base);
3304         if (rc) {
3305                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3306                 goto qfsattr_exit;
3307         }
3308         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3309
3310         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
3311         offset = le16_to_cpu(rsp->OutputBufferOffset);
3312         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
3313         if (rc)
3314                 goto qfsattr_exit;
3315
3316         if (level == FS_ATTRIBUTE_INFORMATION)
3317                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
3318                         + (char *)&rsp->hdr, min_t(unsigned int,
3319                         rsp_len, max_len));
3320         else if (level == FS_DEVICE_INFORMATION)
3321                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
3322                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
3323         else if (level == FS_SECTOR_SIZE_INFORMATION) {
3324                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
3325                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
3326                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
3327                 tcon->perf_sector_size =
3328                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
3329         }
3330
3331 qfsattr_exit:
3332         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3333         return rc;
3334 }
3335
3336 int
3337 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
3338            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3339            const __u32 num_lock, struct smb2_lock_element *buf)
3340 {
3341         int rc = 0;
3342         struct smb2_lock_req *req = NULL;
3343         struct kvec iov[2];
3344         struct kvec rsp_iov;
3345         int resp_buf_type;
3346         unsigned int count;
3347         int flags = CIFS_NO_RESP;
3348
3349         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
3350
3351         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
3352         if (rc)
3353                 return rc;
3354
3355         if (encryption_required(tcon))
3356                 flags |= CIFS_TRANSFORM_REQ;
3357
3358         req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
3359         req->LockCount = cpu_to_le16(num_lock);
3360
3361         req->PersistentFileId = persist_fid;
3362         req->VolatileFileId = volatile_fid;
3363
3364         count = num_lock * sizeof(struct smb2_lock_element);
3365         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
3366
3367         iov[0].iov_base = (char *)req;
3368         /* 4 for rfc1002 length field and count for all locks */
3369         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
3370         iov[1].iov_base = (char *)buf;
3371         iov[1].iov_len = count;
3372
3373         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
3374         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, flags,
3375                           &rsp_iov);
3376         cifs_small_buf_release(req);
3377         if (rc) {
3378                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
3379                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
3380         }
3381
3382         return rc;
3383 }
3384
3385 int
3386 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
3387           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3388           const __u64 length, const __u64 offset, const __u32 lock_flags,
3389           const bool wait)
3390 {
3391         struct smb2_lock_element lock;
3392
3393         lock.Offset = cpu_to_le64(offset);
3394         lock.Length = cpu_to_le64(length);
3395         lock.Flags = cpu_to_le32(lock_flags);
3396         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
3397                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
3398
3399         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
3400 }
3401
3402 int
3403 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
3404                  __u8 *lease_key, const __le32 lease_state)
3405 {
3406         int rc;
3407         struct smb2_lease_ack *req = NULL;
3408         int flags = CIFS_OBREAK_OP;
3409
3410         cifs_dbg(FYI, "SMB2_lease_break\n");
3411         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
3412         if (rc)
3413                 return rc;
3414
3415         if (encryption_required(tcon))
3416                 flags |= CIFS_TRANSFORM_REQ;
3417
3418         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
3419         req->StructureSize = cpu_to_le16(36);
3420         inc_rfc1001_len(req, 12);
3421
3422         memcpy(req->LeaseKey, lease_key, 16);
3423         req->LeaseState = lease_state;
3424
3425         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
3426         cifs_small_buf_release(req);
3427
3428         if (rc) {
3429                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3430                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
3431         }
3432
3433         return rc;
3434 }