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                 server->sec_ntlmssp = true;
 568         }
 569
 570         rc = cifs_enable_signing(server, ses->sign);
 571         if (rc)
 572                 goto neg_exit;
 573         if (blob_length) {
 574                 rc = decode_negTokenInit(security_blob, blob_length, server);
 575                 if (rc == 1)
 576                         rc = 0;
 577                 else if (rc == 0)
 578                         rc = -EIO;
 579         }
 580 neg_exit:
 581         free_rsp_buf(resp_buftype, rsp);
 582         return rc;
 583 }
 584
 585 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 586 {
 587         int rc = 0;
 588         struct validate_negotiate_info_req vneg_inbuf;
 589         struct validate_negotiate_info_rsp *pneg_rsp;
 590         u32 rsplen;
 591
 592         cifs_dbg(FYI, "validate negotiate\n");
 593
 594         /*
 595          * validation ioctl must be signed, so no point sending this if we
 596          * can not sign it.  We could eventually change this to selectively
 597          * sign just this, the first and only signed request on a connection.
 598          * This is good enough for now since a user who wants better security
 599          * would also enable signing on the mount. Having validation of
 600          * negotiate info for signed connections helps reduce attack vectors
 601          */
 602         if (tcon->ses->server->sign == false)
 603                 return 0; /* validation requires signing */
 604
 605         vneg_inbuf.Capabilities =
 606                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 607         memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
 608                                         SMB2_CLIENT_GUID_SIZE);
 609
 610         if (tcon->ses->sign)
 611                 vneg_inbuf.SecurityMode =
 612                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 613         else if (global_secflags & CIFSSEC_MAY_SIGN)
 614                 vneg_inbuf.SecurityMode =
 615                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 616         else
 617                 vneg_inbuf.SecurityMode = 0;
 618
 619         vneg_inbuf.DialectCount = cpu_to_le16(1);
 620         vneg_inbuf.Dialects[0] =
 621                 cpu_to_le16(tcon->ses->server->vals->protocol_id);
 622
 623         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 624                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 625                 false /* use_ipc */,
 626                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
 627                 (char **)&pneg_rsp, &rsplen);
 628
 629         if (rc != 0) {
 630                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 631                 return -EIO;
 632         }
 633
 634         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
 635                 cifs_dbg(VFS, "invalid size of protocol negotiate response\n");
 636                 return -EIO;
 637         }
 638
 639         /* check validate negotiate info response matches what we got earlier */
 640         if (pneg_rsp->Dialect !=
 641                         cpu_to_le16(tcon->ses->server->vals->protocol_id))
 642                 goto vneg_out;
 643
 644         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 645                 goto vneg_out;
 646
 647         /* do not validate server guid because not saved at negprot time yet */
 648
 649         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 650               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 651                 goto vneg_out;
 652
 653         /* validate negotiate successful */
 654         cifs_dbg(FYI, "validate negotiate info successful\n");
 655         return 0;
 656
 657 vneg_out:
 658         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 659         return -EIO;
 660 }
 661
 662 enum securityEnum
 663 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
 664 {
 665         switch (requested) {
 666         case Kerberos:
 667         case RawNTLMSSP:
 668                 return requested;
 669         case NTLMv2:
 670                 return RawNTLMSSP;
 671         case Unspecified:
 672                 if (server->sec_ntlmssp &&
 673                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
 674                         return RawNTLMSSP;
 675                 if ((server->sec_kerberos || server->sec_mskerberos) &&
 676                         (global_secflags & CIFSSEC_MAY_KRB5))
 677                         return Kerberos;
 678                 /* Fallthrough */
 679         default:
 680                 return Unspecified;
 681         }
 682 }
 683
 684 struct SMB2_sess_data {
 685         unsigned int xid;
 686         struct cifs_ses *ses;
 687         struct nls_table *nls_cp;
 688         void (*func)(struct SMB2_sess_data *);
 689         int result;
 690         u64 previous_session;
 691
 692         /* we will send the SMB in three pieces:
 693          * a fixed length beginning part, an optional
 694          * SPNEGO blob (which can be zero length), and a
 695          * last part which will include the strings
 696          * and rest of bcc area. This allows us to avoid
 697          * a large buffer 17K allocation
 698          */
 699         int buf0_type;
 700         struct kvec iov[2];
 701 };
 702
 703 static int
 704 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
 705 {
 706         int rc;
 707         struct cifs_ses *ses = sess_data->ses;
 708         struct smb2_sess_setup_req *req;
 709         struct TCP_Server_Info *server = ses->server;
 710
 711         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 712         if (rc)
 713                 return rc;
 714
 715         /* First session, not a reauthenticate */
 716         req->hdr.sync_hdr.SessionId = 0;
 717
 718         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
 719         req->PreviousSessionId = sess_data->previous_session;
 720
 721         req->Flags = 0; /* MBZ */
 722         /* to enable echos and oplocks */
 723         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(3);
 724
 725         /* only one of SMB2 signing flags may be set in SMB2 request */
 726         if (server->sign)
 727                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 728         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 729                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 730         else
 731                 req->SecurityMode = 0;
 732
 733         req->Capabilities = 0;
 734         req->Channel = 0; /* MBZ */
 735
 736         sess_data->iov[0].iov_base = (char *)req;
 737         /* 4 for rfc1002 length field and 1 for pad */
 738         sess_data->iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 739         /*
 740          * This variable will be used to clear the buffer
 741          * allocated above in case of any error in the calling function.
 742          */
 743         sess_data->buf0_type = CIFS_SMALL_BUFFER;
 744
 745         return 0;
 746 }
 747
 748 static void
 749 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
 750 {
 751         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
 752         sess_data->buf0_type = CIFS_NO_BUFFER;
 753 }
 754
 755 static int
 756 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
 757 {
 758         int rc;
 759         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
 760         struct kvec rsp_iov = { NULL, 0 };
 761
 762         /* Testing shows that buffer offset must be at location of Buffer[0] */
 763         req->SecurityBufferOffset =
 764                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 765                         1 /* pad */ - 4 /* rfc1001 len */);
 766         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
 767
 768         inc_rfc1001_len(req, sess_data->iov[1].iov_len - 1 /* pad */);
 769
 770         /* BB add code to build os and lm fields */
 771
 772         rc = SendReceive2(sess_data->xid, sess_data->ses,
 773                                 sess_data->iov, 2,
 774                                 &sess_data->buf0_type,
 775                                 CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
 776         cifs_small_buf_release(sess_data->iov[0].iov_base);
 777         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
 778
 779         return rc;
 780 }
 781
 782 static int
 783 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
 784 {
 785         int rc = 0;
 786         struct cifs_ses *ses = sess_data->ses;
 787
 788         mutex_lock(&ses->server->srv_mutex);
 789         if (ses->server->ops->generate_signingkey) {
 790                 rc = ses->server->ops->generate_signingkey(ses);
 791                 if (rc) {
 792                         cifs_dbg(FYI,
 793                                 "SMB3 session key generation failed\n");
 794                         mutex_unlock(&ses->server->srv_mutex);
 795                         return rc;
 796                 }
 797         }
 798         if (!ses->server->session_estab) {
 799                 ses->server->sequence_number = 0x2;
 800                 ses->server->session_estab = true;
 801         }
 802         mutex_unlock(&ses->server->srv_mutex);
 803
 804         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 805         spin_lock(&GlobalMid_Lock);
 806         ses->status = CifsGood;
 807         ses->need_reconnect = false;
 808         spin_unlock(&GlobalMid_Lock);
 809         return rc;
 810 }
 811
 812 #ifdef CONFIG_CIFS_UPCALL
 813 static void
 814 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
 815 {
 816         int rc;
 817         struct cifs_ses *ses = sess_data->ses;
 818         struct cifs_spnego_msg *msg;
 819         struct key *spnego_key = NULL;
 820         struct smb2_sess_setup_rsp *rsp = NULL;
 821
 822         rc = SMB2_sess_alloc_buffer(sess_data);
 823         if (rc)
 824                 goto out;
 825
 826         spnego_key = cifs_get_spnego_key(ses);
 827         if (IS_ERR(spnego_key)) {
 828                 rc = PTR_ERR(spnego_key);
 829                 spnego_key = NULL;
 830                 goto out;
 831         }
 832
 833         msg = spnego_key->payload.data[0];
 834         /*
 835          * check version field to make sure that cifs.upcall is
 836          * sending us a response in an expected form
 837          */
 838         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
 839                 cifs_dbg(VFS,
 840                           "bad cifs.upcall version. Expected %d got %d",
 841                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
 842                 rc = -EKEYREJECTED;
 843                 goto out_put_spnego_key;
 844         }
 845
 846         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
 847                                          GFP_KERNEL);
 848         if (!ses->auth_key.response) {
 849                 cifs_dbg(VFS,
 850                         "Kerberos can't allocate (%u bytes) memory",
 851                         msg->sesskey_len);
 852                 rc = -ENOMEM;
 853                 goto out_put_spnego_key;
 854         }
 855         ses->auth_key.len = msg->sesskey_len;
 856
 857         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
 858         sess_data->iov[1].iov_len = msg->secblob_len;
 859
 860         rc = SMB2_sess_sendreceive(sess_data);
 861         if (rc)
 862                 goto out_put_spnego_key;
 863
 864         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
 865         ses->Suid = rsp->hdr.sync_hdr.SessionId;
 866
 867         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 868
 869         rc = SMB2_sess_establish_session(sess_data);
 870 out_put_spnego_key:
 871         key_invalidate(spnego_key);
 872         key_put(spnego_key);
 873 out:
 874         sess_data->result = rc;
 875         sess_data->func = NULL;
 876         SMB2_sess_free_buffer(sess_data);
 877 }
 878 #else
 879 static void
 880 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
 881 {
 882         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
 883         sess_data->result = -EOPNOTSUPP;
 884         sess_data->func = NULL;
 885 }
 886 #endif
 887
 888 static void
 889 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
 890
 891 static void
 892 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
 893 {
 894         int rc;
 895         struct cifs_ses *ses = sess_data->ses;
 896         struct smb2_sess_setup_rsp *rsp = NULL;
 897         char *ntlmssp_blob = NULL;
 898         bool use_spnego = false; /* else use raw ntlmssp */
 899         u16 blob_length = 0;
 900
 901         /*
 902          * If memory allocation is successful, caller of this function
 903          * frees it.
 904          */
 905         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 906         if (!ses->ntlmssp) {
 907                 rc = -ENOMEM;
 908                 goto out_err;
 909         }
 910         ses->ntlmssp->sesskey_per_smbsess = true;
 911
 912         rc = SMB2_sess_alloc_buffer(sess_data);
 913         if (rc)
 914                 goto out_err;
 915
 916         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 917                                GFP_KERNEL);
 918         if (ntlmssp_blob == NULL) {
 919                 rc = -ENOMEM;
 920                 goto out;
 921         }
 922
 923         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 924         if (use_spnego) {
 925                 /* BB eventually need to add this */
 926                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 927                 rc = -EOPNOTSUPP;
 928                 goto out;
 929         } else {
 930                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 931                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 932         }
 933         sess_data->iov[1].iov_base = ntlmssp_blob;
 934         sess_data->iov[1].iov_len = blob_length;
 935
 936         rc = SMB2_sess_sendreceive(sess_data);
 937         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
 938
 939         /* If true, rc here is expected and not an error */
 940         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
 941                 rsp->hdr.sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
 942                 rc = 0;
 943
 944         if (rc)
 945                 goto out;
 946
 947         if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 948                         le16_to_cpu(rsp->SecurityBufferOffset)) {
 949                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 950                         le16_to_cpu(rsp->SecurityBufferOffset));
 951                 rc = -EIO;
 952                 goto out;
 953         }
 954         rc = decode_ntlmssp_challenge(rsp->Buffer,
 955                         le16_to_cpu(rsp->SecurityBufferLength), ses);
 956         if (rc)
 957                 goto out;
 958
 959         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
 960
 961
 962         ses->Suid = rsp->hdr.sync_hdr.SessionId;
 963         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 964
 965 out:
 966         kfree(ntlmssp_blob);
 967         SMB2_sess_free_buffer(sess_data);
 968         if (!rc) {
 969                 sess_data->result = 0;
 970                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
 971                 return;
 972         }
 973 out_err:
 974         kfree(ses->ntlmssp);
 975         ses->ntlmssp = NULL;
 976         sess_data->result = rc;
 977         sess_data->func = NULL;
 978 }
 979
 980 static void
 981 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
 982 {
 983         int rc;
 984         struct cifs_ses *ses = sess_data->ses;
 985         struct smb2_sess_setup_req *req;
 986         struct smb2_sess_setup_rsp *rsp = NULL;
 987         unsigned char *ntlmssp_blob = NULL;
 988         bool use_spnego = false; /* else use raw ntlmssp */
 989         u16 blob_length = 0;
 990
 991         rc = SMB2_sess_alloc_buffer(sess_data);
 992         if (rc)
 993                 goto out;
 994
 995         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
 996         req->hdr.sync_hdr.SessionId = ses->Suid;
 997
 998         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
 999                                         sess_data->nls_cp);
1000         if (rc) {
1001                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1002                 goto out;
1003         }
1004
1005         if (use_spnego) {
1006                 /* BB eventually need to add this */
1007                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1008                 rc = -EOPNOTSUPP;
1009                 goto out;
1010         }
1011         sess_data->iov[1].iov_base = ntlmssp_blob;
1012         sess_data->iov[1].iov_len = blob_length;
1013
1014         rc = SMB2_sess_sendreceive(sess_data);
1015         if (rc)
1016                 goto out;
1017
1018         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1019
1020         ses->Suid = rsp->hdr.sync_hdr.SessionId;
1021         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1022
1023         rc = SMB2_sess_establish_session(sess_data);
1024 out:
1025         kfree(ntlmssp_blob);
1026         SMB2_sess_free_buffer(sess_data);
1027         kfree(ses->ntlmssp);
1028         ses->ntlmssp = NULL;
1029         sess_data->result = rc;
1030         sess_data->func = NULL;
1031 }
1032
1033 static int
1034 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1035 {
1036         int type;
1037
1038         type = smb2_select_sectype(ses->server, ses->sectype);
1039         cifs_dbg(FYI, "sess setup type %d\n", type);
1040         if (type == Unspecified) {
1041                 cifs_dbg(VFS,
1042                         "Unable to select appropriate authentication method!");
1043                 return -EINVAL;
1044         }
1045
1046         switch (type) {
1047         case Kerberos:
1048                 sess_data->func = SMB2_auth_kerberos;
1049                 break;
1050         case RawNTLMSSP:
1051                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1052                 break;
1053         default:
1054                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1055                 return -EOPNOTSUPP;
1056         }
1057
1058         return 0;
1059 }
1060
1061 int
1062 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1063                 const struct nls_table *nls_cp)
1064 {
1065         int rc = 0;
1066         struct TCP_Server_Info *server = ses->server;
1067         struct SMB2_sess_data *sess_data;
1068
1069         cifs_dbg(FYI, "Session Setup\n");
1070
1071         if (!server) {
1072                 WARN(1, "%s: server is NULL!\n", __func__);
1073                 return -EIO;
1074         }
1075
1076         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1077         if (!sess_data)
1078                 return -ENOMEM;
1079
1080         rc = SMB2_select_sec(ses, sess_data);
1081         if (rc)
1082                 goto out;
1083         sess_data->xid = xid;
1084         sess_data->ses = ses;
1085         sess_data->buf0_type = CIFS_NO_BUFFER;
1086         sess_data->nls_cp = (struct nls_table *) nls_cp;
1087
1088         while (sess_data->func)
1089                 sess_data->func(sess_data);
1090
1091         rc = sess_data->result;
1092 out:
1093         kfree(sess_data);
1094         return rc;
1095 }
1096
1097 int
1098 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1099 {
1100         struct smb2_logoff_req *req; /* response is also trivial struct */
1101         int rc = 0;
1102         struct TCP_Server_Info *server;
1103         int flags = 0;
1104
1105         cifs_dbg(FYI, "disconnect session %p\n", ses);
1106
1107         if (ses && (ses->server))
1108                 server = ses->server;
1109         else
1110                 return -EIO;
1111
1112         /* no need to send SMB logoff if uid already closed due to reconnect */
1113         if (ses->need_reconnect)
1114                 goto smb2_session_already_dead;
1115
1116         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
1117         if (rc)
1118                 return rc;
1119
1120          /* since no tcon, smb2_init can not do this, so do here */
1121         req->hdr.sync_hdr.SessionId = ses->Suid;
1122
1123         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1124                 flags |= CIFS_TRANSFORM_REQ;
1125         else if (server->sign)
1126                 req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1127
1128         rc = SendReceiveNoRsp(xid, ses, (char *) req, flags);
1129         cifs_small_buf_release(req);
1130         /*
1131          * No tcon so can't do
1132          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1133          */
1134
1135 smb2_session_already_dead:
1136         return rc;
1137 }
1138
1139 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1140 {
1141         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1142 }
1143
1144 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1145
1146 /* These are similar values to what Windows uses */
1147 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1148 {
1149         tcon->max_chunks = 256;
1150         tcon->max_bytes_chunk = 1048576;
1151         tcon->max_bytes_copy = 16777216;
1152 }
1153
1154 int
1155 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1156           struct cifs_tcon *tcon, const struct nls_table *cp)
1157 {
1158         struct smb2_tree_connect_req *req;
1159         struct smb2_tree_connect_rsp *rsp = NULL;
1160         struct kvec iov[2];
1161         struct kvec rsp_iov;
1162         int rc = 0;
1163         int resp_buftype;
1164         int unc_path_len;
1165         struct TCP_Server_Info *server;
1166         __le16 *unc_path = NULL;
1167         int flags = 0;
1168
1169         cifs_dbg(FYI, "TCON\n");
1170
1171         if ((ses->server) && tree)
1172                 server = ses->server;
1173         else
1174                 return -EIO;
1175
1176         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1177         if (unc_path == NULL)
1178                 return -ENOMEM;
1179
1180         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1181         unc_path_len *= 2;
1182         if (unc_path_len < 2) {
1183                 kfree(unc_path);
1184                 return -EINVAL;
1185         }
1186
1187         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1188         if (tcon)
1189                 tcon->tid = 0;
1190
1191         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
1192         if (rc) {
1193                 kfree(unc_path);
1194                 return rc;
1195         }
1196
1197         if (tcon == NULL) {
1198                 if ((ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA))
1199                         flags |= CIFS_TRANSFORM_REQ;
1200
1201                 /* since no tcon, smb2_init can not do this, so do here */
1202                 req->hdr.sync_hdr.SessionId = ses->Suid;
1203                 if (ses->server->sign)
1204                         req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1205         } else if (encryption_required(tcon))
1206                 flags |= CIFS_TRANSFORM_REQ;
1207
1208         iov[0].iov_base = (char *)req;
1209         /* 4 for rfc1002 length field and 1 for pad */
1210         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1211
1212         /* Testing shows that buffer offset must be at location of Buffer[0] */
1213         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1214                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
1215         req->PathLength = cpu_to_le16(unc_path_len - 2);
1216         iov[1].iov_base = unc_path;
1217         iov[1].iov_len = unc_path_len;
1218
1219         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
1220
1221         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
1222         cifs_small_buf_release(req);
1223         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1224
1225         if (rc != 0) {
1226                 if (tcon) {
1227                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1228                         tcon->need_reconnect = true;
1229                 }
1230                 goto tcon_error_exit;
1231         }
1232
1233         if (tcon == NULL) {
1234                 ses->ipc_tid = rsp->hdr.sync_hdr.TreeId;
1235                 goto tcon_exit;
1236         }
1237
1238         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
1239                 cifs_dbg(FYI, "connection to disk share\n");
1240         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
1241                 tcon->ipc = true;
1242                 cifs_dbg(FYI, "connection to pipe share\n");
1243         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
1244                 tcon->print = true;
1245                 cifs_dbg(FYI, "connection to printer\n");
1246         } else {
1247                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1248                 rc = -EOPNOTSUPP;
1249                 goto tcon_error_exit;
1250         }
1251
1252         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1253         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1254         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1255         tcon->tidStatus = CifsGood;
1256         tcon->need_reconnect = false;
1257         tcon->tid = rsp->hdr.sync_hdr.TreeId;
1258         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1259
1260         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1261             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1262                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1263
1264         if (tcon->seal &&
1265             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1266                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1267
1268         init_copy_chunk_defaults(tcon);
1269         if (tcon->ses->server->ops->validate_negotiate)
1270                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1271 tcon_exit:
1272         free_rsp_buf(resp_buftype, rsp);
1273         kfree(unc_path);
1274         return rc;
1275
1276 tcon_error_exit:
1277         if (rsp->hdr.sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1278                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1279         }
1280         goto tcon_exit;
1281 }
1282
1283 int
1284 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1285 {
1286         struct smb2_tree_disconnect_req *req; /* response is trivial */
1287         int rc = 0;
1288         struct TCP_Server_Info *server;
1289         struct cifs_ses *ses = tcon->ses;
1290         int flags = 0;
1291
1292         cifs_dbg(FYI, "Tree Disconnect\n");
1293
1294         if (ses && (ses->server))
1295                 server = ses->server;
1296         else
1297                 return -EIO;
1298
1299         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1300                 return 0;
1301
1302         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
1303         if (rc)
1304                 return rc;
1305
1306         if (encryption_required(tcon))
1307                 flags |= CIFS_TRANSFORM_REQ;
1308
1309         rc = SendReceiveNoRsp(xid, ses, (char *)req, flags);
1310         cifs_small_buf_release(req);
1311         if (rc)
1312                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1313
1314         return rc;
1315 }
1316
1317
1318 static struct create_durable *
1319 create_durable_buf(void)
1320 {
1321         struct create_durable *buf;
1322
1323         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1324         if (!buf)
1325                 return NULL;
1326
1327         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1328                                         (struct create_durable, Data));
1329         buf->ccontext.DataLength = cpu_to_le32(16);
1330         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1331                                 (struct create_durable, Name));
1332         buf->ccontext.NameLength = cpu_to_le16(4);
1333         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1334         buf->Name[0] = 'D';
1335         buf->Name[1] = 'H';
1336         buf->Name[2] = 'n';
1337         buf->Name[3] = 'Q';
1338         return buf;
1339 }
1340
1341 static struct create_durable *
1342 create_reconnect_durable_buf(struct cifs_fid *fid)
1343 {
1344         struct create_durable *buf;
1345
1346         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1347         if (!buf)
1348                 return NULL;
1349
1350         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1351                                         (struct create_durable, Data));
1352         buf->ccontext.DataLength = cpu_to_le32(16);
1353         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1354                                 (struct create_durable, Name));
1355         buf->ccontext.NameLength = cpu_to_le16(4);
1356         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1357         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1358         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1359         buf->Name[0] = 'D';
1360         buf->Name[1] = 'H';
1361         buf->Name[2] = 'n';
1362         buf->Name[3] = 'C';
1363         return buf;
1364 }
1365
1366 static __u8
1367 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1368                   unsigned int *epoch)
1369 {
1370         char *data_offset;
1371         struct create_context *cc;
1372         unsigned int next;
1373         unsigned int remaining;
1374         char *name;
1375
1376         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1377         remaining = le32_to_cpu(rsp->CreateContextsLength);
1378         cc = (struct create_context *)data_offset;
1379         while (remaining >= sizeof(struct create_context)) {
1380                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1381                 if (le16_to_cpu(cc->NameLength) == 4 &&
1382                     strncmp(name, "RqLs", 4) == 0)
1383                         return server->ops->parse_lease_buf(cc, epoch);
1384
1385                 next = le32_to_cpu(cc->Next);
1386                 if (!next)
1387                         break;
1388                 remaining -= next;
1389                 cc = (struct create_context *)((char *)cc + next);
1390         }
1391
1392         return 0;
1393 }
1394
1395 static int
1396 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1397                   unsigned int *num_iovec, __u8 *oplock)
1398 {
1399         struct smb2_create_req *req = iov[0].iov_base;
1400         unsigned int num = *num_iovec;
1401
1402         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1403         if (iov[num].iov_base == NULL)
1404                 return -ENOMEM;
1405         iov[num].iov_len = server->vals->create_lease_size;
1406         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1407         if (!req->CreateContextsOffset)
1408                 req->CreateContextsOffset = cpu_to_le32(
1409                                 sizeof(struct smb2_create_req) - 4 +
1410                                 iov[num - 1].iov_len);
1411         le32_add_cpu(&req->CreateContextsLength,
1412                      server->vals->create_lease_size);
1413         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1414         *num_iovec = num + 1;
1415         return 0;
1416 }
1417
1418 static struct create_durable_v2 *
1419 create_durable_v2_buf(struct cifs_fid *pfid)
1420 {
1421         struct create_durable_v2 *buf;
1422
1423         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1424         if (!buf)
1425                 return NULL;
1426
1427         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1428                                         (struct create_durable_v2, dcontext));
1429         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1430         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1431                                 (struct create_durable_v2, Name));
1432         buf->ccontext.NameLength = cpu_to_le16(4);
1433
1434         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1435         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1436         generate_random_uuid(buf->dcontext.CreateGuid);
1437         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1438
1439         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1440         buf->Name[0] = 'D';
1441         buf->Name[1] = 'H';
1442         buf->Name[2] = '2';
1443         buf->Name[3] = 'Q';
1444         return buf;
1445 }
1446
1447 static struct create_durable_handle_reconnect_v2 *
1448 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1449 {
1450         struct create_durable_handle_reconnect_v2 *buf;
1451
1452         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1453                         GFP_KERNEL);
1454         if (!buf)
1455                 return NULL;
1456
1457         buf->ccontext.DataOffset =
1458                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1459                                      dcontext));
1460         buf->ccontext.DataLength =
1461                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1462         buf->ccontext.NameOffset =
1463                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1464                             Name));
1465         buf->ccontext.NameLength = cpu_to_le16(4);
1466
1467         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1468         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1469         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1470         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1471
1472         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1473         buf->Name[0] = 'D';
1474         buf->Name[1] = 'H';
1475         buf->Name[2] = '2';
1476         buf->Name[3] = 'C';
1477         return buf;
1478 }
1479
1480 static int
1481 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1482                     struct cifs_open_parms *oparms)
1483 {
1484         struct smb2_create_req *req = iov[0].iov_base;
1485         unsigned int num = *num_iovec;
1486
1487         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1488         if (iov[num].iov_base == NULL)
1489                 return -ENOMEM;
1490         iov[num].iov_len = sizeof(struct create_durable_v2);
1491         if (!req->CreateContextsOffset)
1492                 req->CreateContextsOffset =
1493                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1494                                                                 iov[1].iov_len);
1495         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1496         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable_v2));
1497         *num_iovec = num + 1;
1498         return 0;
1499 }
1500
1501 static int
1502 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1503                     struct cifs_open_parms *oparms)
1504 {
1505         struct smb2_create_req *req = iov[0].iov_base;
1506         unsigned int num = *num_iovec;
1507
1508         /* indicate that we don't need to relock the file */
1509         oparms->reconnect = false;
1510
1511         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1512         if (iov[num].iov_base == NULL)
1513                 return -ENOMEM;
1514         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1515         if (!req->CreateContextsOffset)
1516                 req->CreateContextsOffset =
1517                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1518                                                                 iov[1].iov_len);
1519         le32_add_cpu(&req->CreateContextsLength,
1520                         sizeof(struct create_durable_handle_reconnect_v2));
1521         inc_rfc1001_len(&req->hdr,
1522                         sizeof(struct create_durable_handle_reconnect_v2));
1523         *num_iovec = num + 1;
1524         return 0;
1525 }
1526
1527 static int
1528 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1529                     struct cifs_open_parms *oparms, bool use_persistent)
1530 {
1531         struct smb2_create_req *req = iov[0].iov_base;
1532         unsigned int num = *num_iovec;
1533
1534         if (use_persistent) {
1535                 if (oparms->reconnect)
1536                         return add_durable_reconnect_v2_context(iov, num_iovec,
1537                                                                 oparms);
1538                 else
1539                         return add_durable_v2_context(iov, num_iovec, oparms);
1540         }
1541
1542         if (oparms->reconnect) {
1543                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1544                 /* indicate that we don't need to relock the file */
1545                 oparms->reconnect = false;
1546         } else
1547                 iov[num].iov_base = create_durable_buf();
1548         if (iov[num].iov_base == NULL)
1549                 return -ENOMEM;
1550         iov[num].iov_len = sizeof(struct create_durable);
1551         if (!req->CreateContextsOffset)
1552                 req->CreateContextsOffset =
1553                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1554                                                                 iov[1].iov_len);
1555         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1556         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1557         *num_iovec = num + 1;
1558         return 0;
1559 }
1560
1561 static int
1562 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1563                             const char *treename, const __le16 *path)
1564 {
1565         int treename_len, path_len;
1566         struct nls_table *cp;
1567         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1568
1569         /*
1570          * skip leading "\\"
1571          */
1572         treename_len = strlen(treename);
1573         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1574                 return -EINVAL;
1575
1576         treename += 2;
1577         treename_len -= 2;
1578
1579         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1580
1581         /*
1582          * make room for one path separator between the treename and
1583          * path
1584          */
1585         *out_len = treename_len + 1 + path_len;
1586
1587         /*
1588          * final path needs to be null-terminated UTF16 with a
1589          * size aligned to 8
1590          */
1591
1592         *out_size = roundup((*out_len+1)*2, 8);
1593         *out_path = kzalloc(*out_size, GFP_KERNEL);
1594         if (!*out_path)
1595                 return -ENOMEM;
1596
1597         cp = load_nls_default();
1598         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1599         UniStrcat(*out_path, sep);
1600         UniStrcat(*out_path, path);
1601         unload_nls(cp);
1602
1603         return 0;
1604 }
1605
1606 int
1607 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1608           __u8 *oplock, struct smb2_file_all_info *buf,
1609           struct smb2_err_rsp **err_buf)
1610 {
1611         struct smb2_create_req *req;
1612         struct smb2_create_rsp *rsp;
1613         struct TCP_Server_Info *server;
1614         struct cifs_tcon *tcon = oparms->tcon;
1615         struct cifs_ses *ses = tcon->ses;
1616         struct kvec iov[4];
1617         struct kvec rsp_iov;
1618         int resp_buftype;
1619         int uni_path_len;
1620         __le16 *copy_path = NULL;
1621         int copy_size;
1622         int rc = 0;
1623         unsigned int n_iov = 2;
1624         __u32 file_attributes = 0;
1625         char *dhc_buf = NULL, *lc_buf = NULL;
1626         int flags = 0;
1627
1628         cifs_dbg(FYI, "create/open\n");
1629
1630         if (ses && (ses->server))
1631                 server = ses->server;
1632         else
1633                 return -EIO;
1634
1635         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1636         if (rc)
1637                 return rc;
1638
1639         if (encryption_required(tcon))
1640                 flags |= CIFS_TRANSFORM_REQ;
1641
1642         if (oparms->create_options & CREATE_OPTION_READONLY)
1643                 file_attributes |= ATTR_READONLY;
1644         if (oparms->create_options & CREATE_OPTION_SPECIAL)
1645                 file_attributes |= ATTR_SYSTEM;
1646
1647         req->ImpersonationLevel = IL_IMPERSONATION;
1648         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1649         /* File attributes ignored on open (used in create though) */
1650         req->FileAttributes = cpu_to_le32(file_attributes);
1651         req->ShareAccess = FILE_SHARE_ALL_LE;
1652         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1653         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1654
1655         iov[0].iov_base = (char *)req;
1656         /* 4 for rfc1002 length field */
1657         iov[0].iov_len = get_rfc1002_length(req) + 4;
1658         /* -1 since last byte is buf[0] which is sent below (path) */
1659         iov[0].iov_len--;
1660
1661         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1662
1663         /* [MS-SMB2] 2.2.13 NameOffset:
1664          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
1665          * the SMB2 header, the file name includes a prefix that will
1666          * be processed during DFS name normalization as specified in
1667          * section 3.3.5.9. Otherwise, the file name is relative to
1668          * the share that is identified by the TreeId in the SMB2
1669          * header.
1670          */
1671         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
1672                 int name_len;
1673
1674                 req->hdr.sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
1675                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
1676                                                  &name_len,
1677                                                  tcon->treeName, path);
1678                 if (rc)
1679                         return rc;
1680                 req->NameLength = cpu_to_le16(name_len * 2);
1681                 uni_path_len = copy_size;
1682                 path = copy_path;
1683         } else {
1684                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1685                 /* MUST set path len (NameLength) to 0 opening root of share */
1686                 req->NameLength = cpu_to_le16(uni_path_len - 2);
1687                 if (uni_path_len % 8 != 0) {
1688                         copy_size = roundup(uni_path_len, 8);
1689                         copy_path = kzalloc(copy_size, GFP_KERNEL);
1690                         if (!copy_path)
1691                                 return -ENOMEM;
1692                         memcpy((char *)copy_path, (const char *)path,
1693                                uni_path_len);
1694                         uni_path_len = copy_size;
1695                         path = copy_path;
1696                 }
1697         }
1698
1699         iov[1].iov_len = uni_path_len;
1700         iov[1].iov_base = path;
1701         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1702         inc_rfc1001_len(req, uni_path_len - 1);
1703
1704         if (!server->oplocks)
1705                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1706
1707         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1708             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1709                 req->RequestedOplockLevel = *oplock;
1710         else {
1711                 rc = add_lease_context(server, iov, &n_iov, oplock);
1712                 if (rc) {
1713                         cifs_small_buf_release(req);
1714                         kfree(copy_path);
1715                         return rc;
1716                 }
1717                 lc_buf = iov[n_iov-1].iov_base;
1718         }
1719
1720         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1721                 /* need to set Next field of lease context if we request it */
1722                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1723                         struct create_context *ccontext =
1724                             (struct create_context *)iov[n_iov-1].iov_base;
1725                         ccontext->Next =
1726                                 cpu_to_le32(server->vals->create_lease_size);
1727                 }
1728
1729                 rc = add_durable_context(iov, &n_iov, oparms,
1730                                         tcon->use_persistent);
1731                 if (rc) {
1732                         cifs_small_buf_release(req);
1733                         kfree(copy_path);
1734                         kfree(lc_buf);
1735                         return rc;
1736                 }
1737                 dhc_buf = iov[n_iov-1].iov_base;
1738         }
1739
1740         rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov);
1741         cifs_small_buf_release(req);
1742         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
1743
1744         if (rc != 0) {
1745                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1746                 if (err_buf)
1747                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1748                                            GFP_KERNEL);
1749                 goto creat_exit;
1750         }
1751
1752         oparms->fid->persistent_fid = rsp->PersistentFileId;
1753         oparms->fid->volatile_fid = rsp->VolatileFileId;
1754
1755         if (buf) {
1756                 memcpy(buf, &rsp->CreationTime, 32);
1757                 buf->AllocationSize = rsp->AllocationSize;
1758                 buf->EndOfFile = rsp->EndofFile;
1759                 buf->Attributes = rsp->FileAttributes;
1760                 buf->NumberOfLinks = cpu_to_le32(1);
1761                 buf->DeletePending = 0;
1762         }
1763
1764         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1765                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1766         else
1767                 *oplock = rsp->OplockLevel;
1768 creat_exit:
1769         kfree(copy_path);
1770         kfree(lc_buf);
1771         kfree(dhc_buf);
1772         free_rsp_buf(resp_buftype, rsp);
1773         return rc;
1774 }
1775
1776 /*
1777  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1778  */
1779 int
1780 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1781            u64 volatile_fid, u32 opcode, bool is_fsctl, bool use_ipc,
1782            char *in_data, u32 indatalen,
1783            char **out_data, u32 *plen /* returned data len */)
1784 {
1785         struct smb2_ioctl_req *req;
1786         struct smb2_ioctl_rsp *rsp;
1787         struct smb2_sync_hdr *shdr;
1788         struct TCP_Server_Info *server;
1789         struct cifs_ses *ses;
1790         struct kvec iov[2];
1791         struct kvec rsp_iov;
1792         int resp_buftype;
1793         int n_iov;
1794         int rc = 0;
1795         int flags = 0;
1796
1797         cifs_dbg(FYI, "SMB2 IOCTL\n");
1798
1799         if (out_data != NULL)
1800                 *out_data = NULL;
1801
1802         /* zero out returned data len, in case of error */
1803         if (plen)
1804                 *plen = 0;
1805
1806         if (tcon)
1807                 ses = tcon->ses;
1808         else
1809                 return -EIO;
1810
1811         if (ses && (ses->server))
1812                 server = ses->server;
1813         else
1814                 return -EIO;
1815
1816         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1817         if (rc)
1818                 return rc;
1819
1820         if (use_ipc) {
1821                 if (ses->ipc_tid == 0) {
1822                         cifs_small_buf_release(req);
1823                         return -ENOTCONN;
1824                 }
1825
1826                 cifs_dbg(FYI, "replacing tid 0x%x with IPC tid 0x%x\n",
1827                          req->hdr.sync_hdr.TreeId, ses->ipc_tid);
1828                 req->hdr.sync_hdr.TreeId = ses->ipc_tid;
1829         }
1830         if (encryption_required(tcon))
1831                 flags |= CIFS_TRANSFORM_REQ;
1832
1833         req->CtlCode = cpu_to_le32(opcode);
1834         req->PersistentFileId = persistent_fid;
1835         req->VolatileFileId = volatile_fid;
1836
1837         if (indatalen) {
1838                 req->InputCount = cpu_to_le32(indatalen);
1839                 /* do not set InputOffset if no input data */
1840                 req->InputOffset =
1841                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1842                 iov[1].iov_base = in_data;
1843                 iov[1].iov_len = indatalen;
1844                 n_iov = 2;
1845         } else
1846                 n_iov = 1;
1847
1848         req->OutputOffset = 0;
1849         req->OutputCount = 0; /* MBZ */
1850
1851         /*
1852          * Could increase MaxOutputResponse, but that would require more
1853          * than one credit. Windows typically sets this smaller, but for some
1854          * ioctls it may be useful to allow server to send more. No point
1855          * limiting what the server can send as long as fits in one credit
1856          */
1857         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1858
1859         if (is_fsctl)
1860                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1861         else
1862                 req->Flags = 0;
1863
1864         iov[0].iov_base = (char *)req;
1865
1866         /*
1867          * If no input data, the size of ioctl struct in
1868          * protocol spec still includes a 1 byte data buffer,
1869          * but if input data passed to ioctl, we do not
1870          * want to double count this, so we do not send
1871          * the dummy one byte of data in iovec[0] if sending
1872          * input data (in iovec[1]). We also must add 4 bytes
1873          * in first iovec to allow for rfc1002 length field.
1874          */
1875
1876         if (indatalen) {
1877                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1878                 inc_rfc1001_len(req, indatalen - 1);
1879         } else
1880                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1881
1882
1883         rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov);
1884         cifs_small_buf_release(req);
1885         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
1886
1887         if ((rc != 0) && (rc != -EINVAL)) {
1888                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1889                 goto ioctl_exit;
1890         } else if (rc == -EINVAL) {
1891                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1892                     (opcode != FSCTL_SRV_COPYCHUNK)) {
1893                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1894                         goto ioctl_exit;
1895                 }
1896         }
1897
1898         /* check if caller wants to look at return data or just return rc */
1899         if ((plen == NULL) || (out_data == NULL))
1900                 goto ioctl_exit;
1901
1902         *plen = le32_to_cpu(rsp->OutputCount);
1903
1904         /* We check for obvious errors in the output buffer length and offset */
1905         if (*plen == 0)
1906                 goto ioctl_exit; /* server returned no data */
1907         else if (*plen > 0xFF00) {
1908                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1909                 *plen = 0;
1910                 rc = -EIO;
1911                 goto ioctl_exit;
1912         }
1913
1914         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1915                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1916                         le32_to_cpu(rsp->OutputOffset));
1917                 *plen = 0;
1918                 rc = -EIO;
1919                 goto ioctl_exit;
1920         }
1921
1922         *out_data = kmalloc(*plen, GFP_KERNEL);
1923         if (*out_data == NULL) {
1924                 rc = -ENOMEM;
1925                 goto ioctl_exit;
1926         }
1927
1928         shdr = get_sync_hdr(rsp);
1929         memcpy(*out_data, (char *)shdr + le32_to_cpu(rsp->OutputOffset), *plen);
1930 ioctl_exit:
1931         free_rsp_buf(resp_buftype, rsp);
1932         return rc;
1933 }
1934
1935 /*
1936  *   Individual callers to ioctl worker function follow
1937  */
1938
1939 int
1940 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1941                      u64 persistent_fid, u64 volatile_fid)
1942 {
1943         int rc;
1944         struct  compress_ioctl fsctl_input;
1945         char *ret_data = NULL;
1946
1947         fsctl_input.CompressionState =
1948                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1949
1950         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1951                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1952                         false /* use_ipc */,
1953                         (char *)&fsctl_input /* data input */,
1954                         2 /* in data len */, &ret_data /* out data */, NULL);
1955
1956         cifs_dbg(FYI, "set compression rc %d\n", rc);
1957
1958         return rc;
1959 }
1960
1961 int
1962 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1963            u64 persistent_fid, u64 volatile_fid)
1964 {
1965         struct smb2_close_req *req;
1966         struct smb2_close_rsp *rsp;
1967         struct TCP_Server_Info *server;
1968         struct cifs_ses *ses = tcon->ses;
1969         struct kvec iov[1];
1970         struct kvec rsp_iov;
1971         int resp_buftype;
1972         int rc = 0;
1973         int flags = 0;
1974
1975         cifs_dbg(FYI, "Close\n");
1976
1977         if (ses && (ses->server))
1978                 server = ses->server;
1979         else
1980                 return -EIO;
1981
1982         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1983         if (rc)
1984                 return rc;
1985
1986         if (encryption_required(tcon))
1987                 flags |= CIFS_TRANSFORM_REQ;
1988
1989         req->PersistentFileId = persistent_fid;
1990         req->VolatileFileId = volatile_fid;
1991
1992         iov[0].iov_base = (char *)req;
1993         /* 4 for rfc1002 length field */
1994         iov[0].iov_len = get_rfc1002_length(req) + 4;
1995
1996         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
1997         cifs_small_buf_release(req);
1998         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
1999
2000         if (rc != 0) {
2001                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2002                 goto close_exit;
2003         }
2004
2005         /* BB FIXME - decode close response, update inode for caching */
2006
2007 close_exit:
2008         free_rsp_buf(resp_buftype, rsp);
2009         return rc;
2010 }
2011
2012 static int
2013 validate_buf(unsigned int offset, unsigned int buffer_length,
2014              struct smb2_hdr *hdr, unsigned int min_buf_size)
2015
2016 {
2017         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
2018         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
2019         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2020         char *end_of_buf = begin_of_buf + buffer_length;
2021
2022
2023         if (buffer_length < min_buf_size) {
2024                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2025                          buffer_length, min_buf_size);
2026                 return -EINVAL;
2027         }
2028
2029         /* check if beyond RFC1001 maximum length */
2030         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2031                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2032                          buffer_length, smb_len);
2033                 return -EINVAL;
2034         }
2035
2036         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2037                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2038                 return -EINVAL;
2039         }
2040
2041         return 0;
2042 }
2043
2044 /*
2045  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2046  * Caller must free buffer.
2047  */
2048 static int
2049 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
2050                       struct smb2_hdr *hdr, unsigned int minbufsize,
2051                       char *data)
2052
2053 {
2054         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2055         int rc;
2056
2057         if (!data)
2058                 return -EINVAL;
2059
2060         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
2061         if (rc)
2062                 return rc;
2063
2064         memcpy(data, begin_of_buf, buffer_length);
2065
2066         return 0;
2067 }
2068
2069 static int
2070 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2071            u64 persistent_fid, u64 volatile_fid, u8 info_class,
2072            size_t output_len, size_t min_len, void *data)
2073 {
2074         struct smb2_query_info_req *req;
2075         struct smb2_query_info_rsp *rsp = NULL;
2076         struct kvec iov[2];
2077         struct kvec rsp_iov;
2078         int rc = 0;
2079         int resp_buftype;
2080         struct TCP_Server_Info *server;
2081         struct cifs_ses *ses = tcon->ses;
2082         int flags = 0;
2083
2084         cifs_dbg(FYI, "Query Info\n");
2085
2086         if (ses && (ses->server))
2087                 server = ses->server;
2088         else
2089                 return -EIO;
2090
2091         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2092         if (rc)
2093                 return rc;
2094
2095         if (encryption_required(tcon))
2096                 flags |= CIFS_TRANSFORM_REQ;
2097
2098         req->InfoType = SMB2_O_INFO_FILE;
2099         req->FileInfoClass = info_class;
2100         req->PersistentFileId = persistent_fid;
2101         req->VolatileFileId = volatile_fid;
2102         /* 4 for rfc1002 length field and 1 for Buffer */
2103         req->InputBufferOffset =
2104                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2105         req->OutputBufferLength = cpu_to_le32(output_len);
2106
2107         iov[0].iov_base = (char *)req;
2108         /* 4 for rfc1002 length field */
2109         iov[0].iov_len = get_rfc1002_length(req) + 4;
2110
2111         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2112         cifs_small_buf_release(req);
2113         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2114
2115         if (rc) {
2116                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2117                 goto qinf_exit;
2118         }
2119
2120         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
2121                                    le32_to_cpu(rsp->OutputBufferLength),
2122                                    &rsp->hdr, min_len, data);
2123
2124 qinf_exit:
2125         free_rsp_buf(resp_buftype, rsp);
2126         return rc;
2127 }
2128
2129 int
2130 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2131                 u64 persistent_fid, u64 volatile_fid,
2132                 struct smb2_file_all_info *data)
2133 {
2134         return query_info(xid, tcon, persistent_fid, volatile_fid,
2135                           FILE_ALL_INFORMATION,
2136                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2137                           sizeof(struct smb2_file_all_info), data);
2138 }
2139
2140 int
2141 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2142                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2143 {
2144         return query_info(xid, tcon, persistent_fid, volatile_fid,
2145                           FILE_INTERNAL_INFORMATION,
2146                           sizeof(struct smb2_file_internal_info),
2147                           sizeof(struct smb2_file_internal_info), uniqueid);
2148 }
2149
2150 /*
2151  * This is a no-op for now. We're not really interested in the reply, but
2152  * rather in the fact that the server sent one and that server->lstrp
2153  * gets updated.
2154  *
2155  * FIXME: maybe we should consider checking that the reply matches request?
2156  */
2157 static void
2158 smb2_echo_callback(struct mid_q_entry *mid)
2159 {
2160         struct TCP_Server_Info *server = mid->callback_data;
2161         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2162         unsigned int credits_received = 1;
2163
2164         if (mid->mid_state == MID_RESPONSE_RECEIVED)
2165                 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2166
2167         mutex_lock(&server->srv_mutex);
2168         DeleteMidQEntry(mid);
2169         mutex_unlock(&server->srv_mutex);
2170         add_credits(server, credits_received, CIFS_ECHO_OP);
2171 }
2172
2173 void smb2_reconnect_server(struct work_struct *work)
2174 {
2175         struct TCP_Server_Info *server = container_of(work,
2176                                         struct TCP_Server_Info, reconnect.work);
2177         struct cifs_ses *ses;
2178         struct cifs_tcon *tcon, *tcon2;
2179         struct list_head tmp_list;
2180         int tcon_exist = false;
2181         int rc;
2182         int resched = false;
2183
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                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2212                 if (!rc)
2213                         cifs_reopen_persistent_handles(tcon);
2214                 else
2215                         resched = true;
2216                 list_del_init(&tcon->rlist);
2217                 cifs_put_tcon(tcon);
2218         }
2219
2220         cifs_dbg(FYI, "Reconnecting tcons finished\n");
2221         if (resched)
2222                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2223         mutex_unlock(&server->reconnect_mutex);
2224
2225         /* now we can safely release srv struct */
2226         if (tcon_exist)
2227                 cifs_put_tcp_session(server, 1);
2228 }
2229
2230 int
2231 SMB2_echo(struct TCP_Server_Info *server)
2232 {
2233         struct smb2_echo_req *req;
2234         int rc = 0;
2235         struct kvec iov[2];
2236         struct smb_rqst rqst = { .rq_iov = iov,
2237                                  .rq_nvec = 2 };
2238
2239         cifs_dbg(FYI, "In echo request\n");
2240
2241         if (server->tcpStatus == CifsNeedNegotiate) {
2242                 /* No need to send echo on newly established connections */
2243                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2244                 return rc;
2245         }
2246
2247         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
2248         if (rc)
2249                 return rc;
2250
2251         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
2252
2253         /* 4 for rfc1002 length field */
2254         iov[0].iov_len = 4;
2255         iov[0].iov_base = (char *)req;
2256         iov[1].iov_len = get_rfc1002_length(req);
2257         iov[1].iov_base = (char *)req + 4;
2258
2259         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2260                              server, CIFS_ECHO_OP);
2261         if (rc)
2262                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2263
2264         cifs_small_buf_release(req);
2265         return rc;
2266 }
2267
2268 int
2269 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2270            u64 volatile_fid)
2271 {
2272         struct smb2_flush_req *req;
2273         struct TCP_Server_Info *server;
2274         struct cifs_ses *ses = tcon->ses;
2275         struct kvec iov[1];
2276         struct kvec rsp_iov;
2277         int resp_buftype;
2278         int rc = 0;
2279         int flags = 0;
2280
2281         cifs_dbg(FYI, "Flush\n");
2282
2283         if (ses && (ses->server))
2284                 server = ses->server;
2285         else
2286                 return -EIO;
2287
2288         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
2289         if (rc)
2290                 return rc;
2291
2292         if (encryption_required(tcon))
2293                 flags |= CIFS_TRANSFORM_REQ;
2294
2295         req->PersistentFileId = persistent_fid;
2296         req->VolatileFileId = volatile_fid;
2297
2298         iov[0].iov_base = (char *)req;
2299         /* 4 for rfc1002 length field */
2300         iov[0].iov_len = get_rfc1002_length(req) + 4;
2301
2302         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2303         cifs_small_buf_release(req);
2304
2305         if (rc != 0)
2306                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2307
2308         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2309         return rc;
2310 }
2311
2312 /*
2313  * To form a chain of read requests, any read requests after the first should
2314  * have the end_of_chain boolean set to true.
2315  */
2316 static int
2317 smb2_new_read_req(void **buf, unsigned int *total_len,
2318                   struct cifs_io_parms *io_parms, unsigned int remaining_bytes,
2319                   int request_type)
2320 {
2321         int rc = -EACCES;
2322         struct smb2_read_plain_req *req = NULL;
2323         struct smb2_sync_hdr *shdr;
2324
2325         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2326                                  total_len);
2327         if (rc)
2328                 return rc;
2329         if (io_parms->tcon->ses->server == NULL)
2330                 return -ECONNABORTED;
2331
2332         shdr = &req->sync_hdr;
2333         shdr->ProcessId = cpu_to_le32(io_parms->pid);
2334
2335         req->PersistentFileId = io_parms->persistent_fid;
2336         req->VolatileFileId = io_parms->volatile_fid;
2337         req->ReadChannelInfoOffset = 0; /* reserved */
2338         req->ReadChannelInfoLength = 0; /* reserved */
2339         req->Channel = 0; /* reserved */
2340         req->MinimumCount = 0;
2341         req->Length = cpu_to_le32(io_parms->length);
2342         req->Offset = cpu_to_le64(io_parms->offset);
2343
2344         if (request_type & CHAINED_REQUEST) {
2345                 if (!(request_type & END_OF_CHAIN)) {
2346                         /* next 8-byte aligned request */
2347                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
2348                         shdr->NextCommand = cpu_to_le32(*total_len);
2349                 } else /* END_OF_CHAIN */
2350                         shdr->NextCommand = 0;
2351                 if (request_type & RELATED_REQUEST) {
2352                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2353                         /*
2354                          * Related requests use info from previous read request
2355                          * in chain.
2356                          */
2357                         shdr->SessionId = 0xFFFFFFFF;
2358                         shdr->TreeId = 0xFFFFFFFF;
2359                         req->PersistentFileId = 0xFFFFFFFF;
2360                         req->VolatileFileId = 0xFFFFFFFF;
2361                 }
2362         }
2363         if (remaining_bytes > io_parms->length)
2364                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
2365         else
2366                 req->RemainingBytes = 0;
2367
2368         *buf = req;
2369         return rc;
2370 }
2371
2372 static void
2373 smb2_readv_callback(struct mid_q_entry *mid)
2374 {
2375         struct cifs_readdata *rdata = mid->callback_data;
2376         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
2377         struct TCP_Server_Info *server = tcon->ses->server;
2378         struct smb2_sync_hdr *shdr =
2379                                 (struct smb2_sync_hdr *)rdata->iov[1].iov_base;
2380         unsigned int credits_received = 1;
2381         struct smb_rqst rqst = { .rq_iov = rdata->iov,
2382                                  .rq_nvec = 2,
2383                                  .rq_pages = rdata->pages,
2384                                  .rq_npages = rdata->nr_pages,
2385                                  .rq_pagesz = rdata->pagesz,
2386                                  .rq_tailsz = rdata->tailsz };
2387
2388         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
2389                  __func__, mid->mid, mid->mid_state, rdata->result,
2390                  rdata->bytes);
2391
2392         switch (mid->mid_state) {
2393         case MID_RESPONSE_RECEIVED:
2394                 credits_received = le16_to_cpu(shdr->CreditRequest);
2395                 /* result already set, check signature */
2396                 if (server->sign && !mid->decrypted) {
2397                         int rc;
2398
2399                         rc = smb2_verify_signature(&rqst, server);
2400                         if (rc)
2401                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
2402                                          rc);
2403                 }
2404                 /* FIXME: should this be counted toward the initiating task? */
2405                 task_io_account_read(rdata->got_bytes);
2406                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2407                 break;
2408         case MID_REQUEST_SUBMITTED:
2409         case MID_RETRY_NEEDED:
2410                 rdata->result = -EAGAIN;
2411                 if (server->sign && rdata->got_bytes)
2412                         /* reset bytes number since we can not check a sign */
2413                         rdata->got_bytes = 0;
2414                 /* FIXME: should this be counted toward the initiating task? */
2415                 task_io_account_read(rdata->got_bytes);
2416                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2417                 break;
2418         default:
2419                 if (rdata->result != -ENODATA)
2420                         rdata->result = -EIO;
2421         }
2422
2423         if (rdata->result)
2424                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
2425
2426         queue_work(cifsiod_wq, &rdata->work);
2427         mutex_lock(&server->srv_mutex);
2428         DeleteMidQEntry(mid);
2429         mutex_unlock(&server->srv_mutex);
2430         add_credits(server, credits_received, 0);
2431 }
2432
2433 /* smb2_async_readv - send an async read, and set up mid to handle result */
2434 int
2435 smb2_async_readv(struct cifs_readdata *rdata)
2436 {
2437         int rc, flags = 0;
2438         char *buf;
2439         struct smb2_sync_hdr *shdr;
2440         struct cifs_io_parms io_parms;
2441         struct smb_rqst rqst = { .rq_iov = rdata->iov,
2442                                  .rq_nvec = 2 };
2443         struct TCP_Server_Info *server;
2444         unsigned int total_len;
2445         __be32 req_len;
2446
2447         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
2448                  __func__, rdata->offset, rdata->bytes);
2449
2450         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
2451         io_parms.offset = rdata->offset;
2452         io_parms.length = rdata->bytes;
2453         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
2454         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
2455         io_parms.pid = rdata->pid;
2456
2457         server = io_parms.tcon->ses->server;
2458
2459         rc = smb2_new_read_req((void **) &buf, &total_len, &io_parms, 0, 0);
2460         if (rc) {
2461                 if (rc == -EAGAIN && rdata->credits) {
2462                         /* credits was reset by reconnect */
2463                         rdata->credits = 0;
2464                         /* reduce in_flight value since we won't send the req */
2465                         spin_lock(&server->req_lock);
2466                         server->in_flight--;
2467                         spin_unlock(&server->req_lock);
2468                 }
2469                 return rc;
2470         }
2471
2472         if (encryption_required(io_parms.tcon))
2473                 flags |= CIFS_TRANSFORM_REQ;
2474
2475         req_len = cpu_to_be32(total_len);
2476
2477         rdata->iov[0].iov_base = &req_len;
2478         rdata->iov[0].iov_len = sizeof(__be32);
2479         rdata->iov[1].iov_base = buf;
2480         rdata->iov[1].iov_len = total_len;
2481
2482         shdr = (struct smb2_sync_hdr *)buf;
2483
2484         if (rdata->credits) {
2485                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2486                                                 SMB2_MAX_BUFFER_SIZE));
2487                 shdr->CreditRequest = shdr->CreditCharge;
2488                 spin_lock(&server->req_lock);
2489                 server->credits += rdata->credits -
2490                                                 le16_to_cpu(shdr->CreditCharge);
2491                 spin_unlock(&server->req_lock);
2492                 wake_up(&server->request_q);
2493                 flags |= CIFS_HAS_CREDITS;
2494         }
2495
2496         kref_get(&rdata->refcount);
2497         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2498                              cifs_readv_receive, smb2_readv_callback,
2499                              smb3_handle_read_data, rdata, flags);
2500         if (rc) {
2501                 kref_put(&rdata->refcount, cifs_readdata_release);
2502                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
2503         }
2504
2505         cifs_small_buf_release(buf);
2506         return rc;
2507 }
2508
2509 int
2510 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
2511           unsigned int *nbytes, char **buf, int *buf_type)
2512 {
2513         int resp_buftype, rc = -EACCES;
2514         struct smb2_read_plain_req *req = NULL;
2515         struct smb2_read_rsp *rsp = NULL;
2516         struct smb2_sync_hdr *shdr;
2517         struct kvec iov[2];
2518         struct kvec rsp_iov;
2519         unsigned int total_len;
2520         __be32 req_len;
2521         struct smb_rqst rqst = { .rq_iov = iov,
2522                                  .rq_nvec = 2 };
2523         int flags = CIFS_LOG_ERROR;
2524         struct cifs_ses *ses = io_parms->tcon->ses;
2525
2526         *nbytes = 0;
2527         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, 0, 0);
2528         if (rc)
2529                 return rc;
2530
2531         if (encryption_required(io_parms->tcon))
2532                 flags |= CIFS_TRANSFORM_REQ;
2533
2534         req_len = cpu_to_be32(total_len);
2535
2536         iov[0].iov_base = &req_len;
2537         iov[0].iov_len = sizeof(__be32);
2538         iov[1].iov_base = req;
2539         iov[1].iov_len = total_len;
2540
2541         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2542         cifs_small_buf_release(req);
2543
2544         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
2545         shdr = get_sync_hdr(rsp);
2546
2547         if (shdr->Status == STATUS_END_OF_FILE) {
2548                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2549                 return 0;
2550         }
2551
2552         if (rc) {
2553                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2554                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
2555         } else {
2556                 *nbytes = le32_to_cpu(rsp->DataLength);
2557                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
2558                     (*nbytes > io_parms->length)) {
2559                         cifs_dbg(FYI, "bad length %d for count %d\n",
2560                                  *nbytes, io_parms->length);
2561                         rc = -EIO;
2562                         *nbytes = 0;
2563                 }
2564         }
2565
2566         if (*buf) {
2567                 memcpy(*buf, (char *)shdr + rsp->DataOffset, *nbytes);
2568                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2569         } else if (resp_buftype != CIFS_NO_BUFFER) {
2570                 *buf = rsp_iov.iov_base;
2571                 if (resp_buftype == CIFS_SMALL_BUFFER)
2572                         *buf_type = CIFS_SMALL_BUFFER;
2573                 else if (resp_buftype == CIFS_LARGE_BUFFER)
2574                         *buf_type = CIFS_LARGE_BUFFER;
2575         }
2576         return rc;
2577 }
2578
2579 /*
2580  * Check the mid_state and signature on received buffer (if any), and queue the
2581  * workqueue completion task.
2582  */
2583 static void
2584 smb2_writev_callback(struct mid_q_entry *mid)
2585 {
2586         struct cifs_writedata *wdata = mid->callback_data;
2587         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2588         struct TCP_Server_Info *server = tcon->ses->server;
2589         unsigned int written;
2590         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
2591         unsigned int credits_received = 1;
2592
2593         switch (mid->mid_state) {
2594         case MID_RESPONSE_RECEIVED:
2595                 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2596                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
2597                 if (wdata->result != 0)
2598                         break;
2599
2600                 written = le32_to_cpu(rsp->DataLength);
2601                 /*
2602                  * Mask off high 16 bits when bytes written as returned
2603                  * by the server is greater than bytes requested by the
2604                  * client. OS/2 servers are known to set incorrect
2605                  * CountHigh values.
2606                  */
2607                 if (written > wdata->bytes)
2608                         written &= 0xFFFF;
2609
2610                 if (written < wdata->bytes)
2611                         wdata->result = -ENOSPC;
2612                 else
2613                         wdata->bytes = written;
2614                 break;
2615         case MID_REQUEST_SUBMITTED:
2616         case MID_RETRY_NEEDED:
2617                 wdata->result = -EAGAIN;
2618                 break;
2619         default:
2620                 wdata->result = -EIO;
2621                 break;
2622         }
2623
2624         if (wdata->result)
2625                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2626
2627         queue_work(cifsiod_wq, &wdata->work);
2628         mutex_lock(&server->srv_mutex);
2629         DeleteMidQEntry(mid);
2630         mutex_unlock(&server->srv_mutex);
2631         add_credits(tcon->ses->server, credits_received, 0);
2632 }
2633
2634 /* smb2_async_writev - send an async write, and set up mid to handle result */
2635 int
2636 smb2_async_writev(struct cifs_writedata *wdata,
2637                   void (*release)(struct kref *kref))
2638 {
2639         int rc = -EACCES, flags = 0;
2640         struct smb2_write_req *req = NULL;
2641         struct smb2_sync_hdr *shdr;
2642         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2643         struct TCP_Server_Info *server = tcon->ses->server;
2644         struct kvec iov[2];
2645         struct smb_rqst rqst = { };
2646
2647         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
2648         if (rc) {
2649                 if (rc == -EAGAIN && wdata->credits) {
2650                         /* credits was reset by reconnect */
2651                         wdata->credits = 0;
2652                         /* reduce in_flight value since we won't send the req */
2653                         spin_lock(&server->req_lock);
2654                         server->in_flight--;
2655                         spin_unlock(&server->req_lock);
2656                 }
2657                 goto async_writev_out;
2658         }
2659
2660         if (encryption_required(tcon))
2661                 flags |= CIFS_TRANSFORM_REQ;
2662
2663         shdr = get_sync_hdr(req);
2664         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
2665
2666         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
2667         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
2668         req->WriteChannelInfoOffset = 0;
2669         req->WriteChannelInfoLength = 0;
2670         req->Channel = 0;
2671         req->Offset = cpu_to_le64(wdata->offset);
2672         /* 4 for rfc1002 length field */
2673         req->DataOffset = cpu_to_le16(
2674                                 offsetof(struct smb2_write_req, Buffer) - 4);
2675         req->RemainingBytes = 0;
2676
2677         /* 4 for rfc1002 length field and 1 for Buffer */
2678         iov[0].iov_len = 4;
2679         iov[0].iov_base = req;
2680         iov[1].iov_len = get_rfc1002_length(req) - 1;
2681         iov[1].iov_base = (char *)req + 4;
2682
2683         rqst.rq_iov = iov;
2684         rqst.rq_nvec = 2;
2685         rqst.rq_pages = wdata->pages;
2686         rqst.rq_npages = wdata->nr_pages;
2687         rqst.rq_pagesz = wdata->pagesz;
2688         rqst.rq_tailsz = wdata->tailsz;
2689
2690         cifs_dbg(FYI, "async write at %llu %u bytes\n",
2691                  wdata->offset, wdata->bytes);
2692
2693         req->Length = cpu_to_le32(wdata->bytes);
2694
2695         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
2696
2697         if (wdata->credits) {
2698                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2699                                                     SMB2_MAX_BUFFER_SIZE));
2700                 shdr->CreditRequest = shdr->CreditCharge;
2701                 spin_lock(&server->req_lock);
2702                 server->credits += wdata->credits -
2703                                                 le16_to_cpu(shdr->CreditCharge);
2704                 spin_unlock(&server->req_lock);
2705                 wake_up(&server->request_q);
2706                 flags |= CIFS_HAS_CREDITS;
2707         }
2708
2709         kref_get(&wdata->refcount);
2710         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
2711                              wdata, flags);
2712
2713         if (rc) {
2714                 kref_put(&wdata->refcount, release);
2715                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2716         }
2717
2718 async_writev_out:
2719         cifs_small_buf_release(req);
2720         return rc;
2721 }
2722
2723 /*
2724  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
2725  * The length field from io_parms must be at least 1 and indicates a number of
2726  * elements with data to write that begins with position 1 in iov array. All
2727  * data length is specified by count.
2728  */
2729 int
2730 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
2731            unsigned int *nbytes, struct kvec *iov, int n_vec)
2732 {
2733         int rc = 0;
2734         struct smb2_write_req *req = NULL;
2735         struct smb2_write_rsp *rsp = NULL;
2736         int resp_buftype;
2737         struct kvec rsp_iov;
2738         int flags = 0;
2739
2740         *nbytes = 0;
2741
2742         if (n_vec < 1)
2743                 return rc;
2744
2745         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
2746         if (rc)
2747                 return rc;
2748
2749         if (io_parms->tcon->ses->server == NULL)
2750                 return -ECONNABORTED;
2751
2752         if (encryption_required(io_parms->tcon))
2753                 flags |= CIFS_TRANSFORM_REQ;
2754
2755         req->hdr.sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
2756
2757         req->PersistentFileId = io_parms->persistent_fid;
2758         req->VolatileFileId = io_parms->volatile_fid;
2759         req->WriteChannelInfoOffset = 0;
2760         req->WriteChannelInfoLength = 0;
2761         req->Channel = 0;
2762         req->Length = cpu_to_le32(io_parms->length);
2763         req->Offset = cpu_to_le64(io_parms->offset);
2764         /* 4 for rfc1002 length field */
2765         req->DataOffset = cpu_to_le16(
2766                                 offsetof(struct smb2_write_req, Buffer) - 4);
2767         req->RemainingBytes = 0;
2768
2769         iov[0].iov_base = (char *)req;
2770         /* 4 for rfc1002 length field and 1 for Buffer */
2771         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2772
2773         /* length of entire message including data to be written */
2774         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2775
2776         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2777                           &resp_buftype, flags, &rsp_iov);
2778         cifs_small_buf_release(req);
2779         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
2780
2781         if (rc) {
2782                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2783                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2784         } else
2785                 *nbytes = le32_to_cpu(rsp->DataLength);
2786
2787         free_rsp_buf(resp_buftype, rsp);
2788         return rc;
2789 }
2790
2791 static unsigned int
2792 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2793 {
2794         int len;
2795         unsigned int entrycount = 0;
2796         unsigned int next_offset = 0;
2797         FILE_DIRECTORY_INFO *entryptr;
2798
2799         if (bufstart == NULL)
2800                 return 0;
2801
2802         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2803
2804         while (1) {
2805                 entryptr = (FILE_DIRECTORY_INFO *)
2806                                         ((char *)entryptr + next_offset);
2807
2808                 if ((char *)entryptr + size > end_of_buf) {
2809                         cifs_dbg(VFS, "malformed search entry would overflow\n");
2810                         break;
2811                 }
2812
2813                 len = le32_to_cpu(entryptr->FileNameLength);
2814                 if ((char *)entryptr + len + size > end_of_buf) {
2815                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2816                                  end_of_buf);
2817                         break;
2818                 }
2819
2820                 *lastentry = (char *)entryptr;
2821                 entrycount++;
2822
2823                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2824                 if (!next_offset)
2825                         break;
2826         }
2827
2828         return entrycount;
2829 }
2830
2831 /*
2832  * Readdir/FindFirst
2833  */
2834 int
2835 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2836                      u64 persistent_fid, u64 volatile_fid, int index,
2837                      struct cifs_search_info *srch_inf)
2838 {
2839         struct smb2_query_directory_req *req;
2840         struct smb2_query_directory_rsp *rsp = NULL;
2841         struct kvec iov[2];
2842         struct kvec rsp_iov;
2843         int rc = 0;
2844         int len;
2845         int resp_buftype = CIFS_NO_BUFFER;
2846         unsigned char *bufptr;
2847         struct TCP_Server_Info *server;
2848         struct cifs_ses *ses = tcon->ses;
2849         __le16 asteriks = cpu_to_le16('*');
2850         char *end_of_smb;
2851         unsigned int output_size = CIFSMaxBufSize;
2852         size_t info_buf_size;
2853         int flags = 0;
2854
2855         if (ses && (ses->server))
2856                 server = ses->server;
2857         else
2858                 return -EIO;
2859
2860         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2861         if (rc)
2862                 return rc;
2863
2864         if (encryption_required(tcon))
2865                 flags |= CIFS_TRANSFORM_REQ;
2866
2867         switch (srch_inf->info_level) {
2868         case SMB_FIND_FILE_DIRECTORY_INFO:
2869                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2870                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2871                 break;
2872         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2873                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2874                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2875                 break;
2876         default:
2877                 cifs_dbg(VFS, "info level %u isn't supported\n",
2878                          srch_inf->info_level);
2879                 rc = -EINVAL;
2880                 goto qdir_exit;
2881         }
2882
2883         req->FileIndex = cpu_to_le32(index);
2884         req->PersistentFileId = persistent_fid;
2885         req->VolatileFileId = volatile_fid;
2886
2887         len = 0x2;
2888         bufptr = req->Buffer;
2889         memcpy(bufptr, &asteriks, len);
2890
2891         req->FileNameOffset =
2892                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2893         req->FileNameLength = cpu_to_le16(len);
2894         /*
2895          * BB could be 30 bytes or so longer if we used SMB2 specific
2896          * buffer lengths, but this is safe and close enough.
2897          */
2898         output_size = min_t(unsigned int, output_size, server->maxBuf);
2899         output_size = min_t(unsigned int, output_size, 2 << 15);
2900         req->OutputBufferLength = cpu_to_le32(output_size);
2901
2902         iov[0].iov_base = (char *)req;
2903         /* 4 for RFC1001 length and 1 for Buffer */
2904         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2905
2906         iov[1].iov_base = (char *)(req->Buffer);
2907         iov[1].iov_len = len;
2908
2909         inc_rfc1001_len(req, len - 1 /* Buffer */);
2910
2911         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
2912         cifs_small_buf_release(req);
2913         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
2914
2915         if (rc) {
2916                 if (rc == -ENODATA &&
2917                     rsp->hdr.sync_hdr.Status == STATUS_NO_MORE_FILES) {
2918                         srch_inf->endOfSearch = true;
2919                         rc = 0;
2920                 }
2921                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2922                 goto qdir_exit;
2923         }
2924
2925         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2926                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2927                           info_buf_size);
2928         if (rc)
2929                 goto qdir_exit;
2930
2931         srch_inf->unicode = true;
2932
2933         if (srch_inf->ntwrk_buf_start) {
2934                 if (srch_inf->smallBuf)
2935                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2936                 else
2937                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2938         }
2939         srch_inf->ntwrk_buf_start = (char *)rsp;
2940         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2941                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2942         /* 4 for rfc1002 length field */
2943         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2944         srch_inf->entries_in_buffer =
2945                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2946                                     &srch_inf->last_entry, info_buf_size);
2947         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2948         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2949                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2950                  srch_inf->srch_entries_start, srch_inf->last_entry);
2951         if (resp_buftype == CIFS_LARGE_BUFFER)
2952                 srch_inf->smallBuf = false;
2953         else if (resp_buftype == CIFS_SMALL_BUFFER)
2954                 srch_inf->smallBuf = true;
2955         else
2956                 cifs_dbg(VFS, "illegal search buffer type\n");
2957
2958         return rc;
2959
2960 qdir_exit:
2961         free_rsp_buf(resp_buftype, rsp);
2962         return rc;
2963 }
2964
2965 static int
2966 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2967                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2968                unsigned int num, void **data, unsigned int *size)
2969 {
2970         struct smb2_set_info_req *req;
2971         struct smb2_set_info_rsp *rsp = NULL;
2972         struct kvec *iov;
2973         struct kvec rsp_iov;
2974         int rc = 0;
2975         int resp_buftype;
2976         unsigned int i;
2977         struct TCP_Server_Info *server;
2978         struct cifs_ses *ses = tcon->ses;
2979         int flags = 0;
2980
2981         if (ses && (ses->server))
2982                 server = ses->server;
2983         else
2984                 return -EIO;
2985
2986         if (!num)
2987                 return -EINVAL;
2988
2989         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2990         if (!iov)
2991                 return -ENOMEM;
2992
2993         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2994         if (rc) {
2995                 kfree(iov);
2996                 return rc;
2997         }
2998
2999         if (encryption_required(tcon))
3000                 flags |= CIFS_TRANSFORM_REQ;
3001
3002         req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
3003
3004         req->InfoType = SMB2_O_INFO_FILE;
3005         req->FileInfoClass = info_class;
3006         req->PersistentFileId = persistent_fid;
3007         req->VolatileFileId = volatile_fid;
3008
3009         /* 4 for RFC1001 length and 1 for Buffer */
3010         req->BufferOffset =
3011                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
3012         req->BufferLength = cpu_to_le32(*size);
3013
3014         inc_rfc1001_len(req, *size - 1 /* Buffer */);
3015
3016         memcpy(req->Buffer, *data, *size);
3017
3018         iov[0].iov_base = (char *)req;
3019         /* 4 for RFC1001 length */
3020         iov[0].iov_len = get_rfc1002_length(req) + 4;
3021
3022         for (i = 1; i < num; i++) {
3023                 inc_rfc1001_len(req, size[i]);
3024                 le32_add_cpu(&req->BufferLength, size[i]);
3025                 iov[i].iov_base = (char *)data[i];
3026                 iov[i].iov_len = size[i];
3027         }
3028
3029         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, flags, &rsp_iov);
3030         cifs_small_buf_release(req);
3031         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3032
3033         if (rc != 0)
3034                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3035
3036         free_rsp_buf(resp_buftype, rsp);
3037         kfree(iov);
3038         return rc;
3039 }
3040
3041 int
3042 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
3043             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3044 {
3045         struct smb2_file_rename_info info;
3046         void **data;
3047         unsigned int size[2];
3048         int rc;
3049         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3050
3051         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3052         if (!data)
3053                 return -ENOMEM;
3054
3055         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
3056                               /* 0 = fail if target already exists */
3057         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3058         info.FileNameLength = cpu_to_le32(len);
3059
3060         data[0] = &info;
3061         size[0] = sizeof(struct smb2_file_rename_info);
3062
3063         data[1] = target_file;
3064         size[1] = len + 2 /* null */;
3065
3066         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3067                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
3068                            size);
3069         kfree(data);
3070         return rc;
3071 }
3072
3073 int
3074 SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
3075                   u64 persistent_fid, u64 volatile_fid)
3076 {
3077         __u8 delete_pending = 1;
3078         void *data;
3079         unsigned int size;
3080
3081         data = &delete_pending;
3082         size = 1; /* sizeof __u8 */
3083
3084         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3085                         current->tgid, FILE_DISPOSITION_INFORMATION, 1, &data,
3086                         &size);
3087 }
3088
3089 int
3090 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
3091                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3092 {
3093         struct smb2_file_link_info info;
3094         void **data;
3095         unsigned int size[2];
3096         int rc;
3097         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3098
3099         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3100         if (!data)
3101                 return -ENOMEM;
3102
3103         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
3104                               /* 0 = fail if link already exists */
3105         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3106         info.FileNameLength = cpu_to_le32(len);
3107
3108         data[0] = &info;
3109         size[0] = sizeof(struct smb2_file_link_info);
3110
3111         data[1] = target_file;
3112         size[1] = len + 2 /* null */;
3113
3114         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3115                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
3116         kfree(data);
3117         return rc;
3118 }
3119
3120 int
3121 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3122              u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
3123 {
3124         struct smb2_file_eof_info info;
3125         void *data;
3126         unsigned int size;
3127
3128         info.EndOfFile = *eof;
3129
3130         data = &info;
3131         size = sizeof(struct smb2_file_eof_info);
3132
3133         if (is_falloc)
3134                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3135                         pid, FILE_ALLOCATION_INFORMATION, 1, &data, &size);
3136         else
3137                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3138                         pid, FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
3139 }
3140
3141 int
3142 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3143               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
3144 {
3145         unsigned int size;
3146         size = sizeof(FILE_BASIC_INFO);
3147         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3148                              current->tgid, FILE_BASIC_INFORMATION, 1,
3149                              (void **)&buf, &size);
3150 }
3151
3152 int
3153 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3154                   const u64 persistent_fid, const u64 volatile_fid,
3155                   __u8 oplock_level)
3156 {
3157         int rc;
3158         struct smb2_oplock_break *req = NULL;
3159         int flags = CIFS_OBREAK_OP;
3160
3161         cifs_dbg(FYI, "SMB2_oplock_break\n");
3162         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
3163         if (rc)
3164                 return rc;
3165
3166         if (encryption_required(tcon))
3167                 flags |= CIFS_TRANSFORM_REQ;
3168
3169         req->VolatileFid = volatile_fid;
3170         req->PersistentFid = persistent_fid;
3171         req->OplockLevel = oplock_level;
3172         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
3173
3174         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
3175         cifs_small_buf_release(req);
3176
3177         if (rc) {
3178                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3179                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3180         }
3181
3182         return rc;
3183 }
3184
3185 static void
3186 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
3187                         struct kstatfs *kst)
3188 {
3189         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
3190                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
3191         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
3192         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
3193         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3194         return;
3195 }
3196
3197 static int
3198 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
3199                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
3200 {
3201         int rc;
3202         struct smb2_query_info_req *req;
3203
3204         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
3205
3206         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
3207                 return -EIO;
3208
3209         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
3210         if (rc)
3211                 return rc;
3212
3213         req->InfoType = SMB2_O_INFO_FILESYSTEM;
3214         req->FileInfoClass = level;
3215         req->PersistentFileId = persistent_fid;
3216         req->VolatileFileId = volatile_fid;
3217         /* 4 for rfc1002 length field and 1 for pad */
3218         req->InputBufferOffset =
3219                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
3220         req->OutputBufferLength = cpu_to_le32(
3221                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
3222
3223         iov->iov_base = (char *)req;
3224         /* 4 for rfc1002 length field */
3225         iov->iov_len = get_rfc1002_length(req) + 4;
3226         return 0;
3227 }
3228
3229 int
3230 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
3231               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
3232 {
3233         struct smb2_query_info_rsp *rsp = NULL;
3234         struct kvec iov;
3235         struct kvec rsp_iov;
3236         int rc = 0;
3237         int resp_buftype;
3238         struct cifs_ses *ses = tcon->ses;
3239         struct smb2_fs_full_size_info *info = NULL;
3240         int flags = 0;
3241
3242         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
3243                                 sizeof(struct smb2_fs_full_size_info),
3244                                 persistent_fid, volatile_fid);
3245         if (rc)
3246                 return rc;
3247
3248         if (encryption_required(tcon))
3249                 flags |= CIFS_TRANSFORM_REQ;
3250
3251         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3252         cifs_small_buf_release(iov.iov_base);
3253         if (rc) {
3254                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3255                 goto qfsinf_exit;
3256         }
3257         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3258
3259         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
3260                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
3261         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
3262                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
3263                           sizeof(struct smb2_fs_full_size_info));
3264         if (!rc)
3265                 copy_fs_info_to_kstatfs(info, fsdata);
3266
3267 qfsinf_exit:
3268         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3269         return rc;
3270 }
3271
3272 int
3273 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
3274               u64 persistent_fid, u64 volatile_fid, int level)
3275 {
3276         struct smb2_query_info_rsp *rsp = NULL;
3277         struct kvec iov;
3278         struct kvec rsp_iov;
3279         int rc = 0;
3280         int resp_buftype, max_len, min_len;
3281         struct cifs_ses *ses = tcon->ses;
3282         unsigned int rsp_len, offset;
3283         int flags = 0;
3284
3285         if (level == FS_DEVICE_INFORMATION) {
3286                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3287                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3288         } else if (level == FS_ATTRIBUTE_INFORMATION) {
3289                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
3290                 min_len = MIN_FS_ATTR_INFO_SIZE;
3291         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
3292                 max_len = sizeof(struct smb3_fs_ss_info);
3293                 min_len = sizeof(struct smb3_fs_ss_info);
3294         } else {
3295                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
3296                 return -EINVAL;
3297         }
3298
3299         rc = build_qfs_info_req(&iov, tcon, level, max_len,
3300                                 persistent_fid, volatile_fid);
3301         if (rc)
3302                 return rc;
3303
3304         if (encryption_required(tcon))
3305                 flags |= CIFS_TRANSFORM_REQ;
3306
3307         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3308         cifs_small_buf_release(iov.iov_base);
3309         if (rc) {
3310                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3311                 goto qfsattr_exit;
3312         }
3313         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3314
3315         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
3316         offset = le16_to_cpu(rsp->OutputBufferOffset);
3317         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
3318         if (rc)
3319                 goto qfsattr_exit;
3320
3321         if (level == FS_ATTRIBUTE_INFORMATION)
3322                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
3323                         + (char *)&rsp->hdr, min_t(unsigned int,
3324                         rsp_len, max_len));
3325         else if (level == FS_DEVICE_INFORMATION)
3326                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
3327                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
3328         else if (level == FS_SECTOR_SIZE_INFORMATION) {
3329                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
3330                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
3331                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
3332                 tcon->perf_sector_size =
3333                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
3334         }
3335
3336 qfsattr_exit:
3337         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3338         return rc;
3339 }
3340
3341 int
3342 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
3343            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3344            const __u32 num_lock, struct smb2_lock_element *buf)
3345 {
3346         int rc = 0;
3347         struct smb2_lock_req *req = NULL;
3348         struct kvec iov[2];
3349         struct kvec rsp_iov;
3350         int resp_buf_type;
3351         unsigned int count;
3352         int flags = CIFS_NO_RESP;
3353
3354         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
3355
3356         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
3357         if (rc)
3358                 return rc;
3359
3360         if (encryption_required(tcon))
3361                 flags |= CIFS_TRANSFORM_REQ;
3362
3363         req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
3364         req->LockCount = cpu_to_le16(num_lock);
3365
3366         req->PersistentFileId = persist_fid;
3367         req->VolatileFileId = volatile_fid;
3368
3369         count = num_lock * sizeof(struct smb2_lock_element);
3370         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
3371
3372         iov[0].iov_base = (char *)req;
3373         /* 4 for rfc1002 length field and count for all locks */
3374         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
3375         iov[1].iov_base = (char *)buf;
3376         iov[1].iov_len = count;
3377
3378         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
3379         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, flags,
3380                           &rsp_iov);
3381         cifs_small_buf_release(req);
3382         if (rc) {
3383                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
3384                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
3385         }
3386
3387         return rc;
3388 }
3389
3390 int
3391 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
3392           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3393           const __u64 length, const __u64 offset, const __u32 lock_flags,
3394           const bool wait)
3395 {
3396         struct smb2_lock_element lock;
3397
3398         lock.Offset = cpu_to_le64(offset);
3399         lock.Length = cpu_to_le64(length);
3400         lock.Flags = cpu_to_le32(lock_flags);
3401         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
3402                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
3403
3404         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
3405 }
3406
3407 int
3408 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
3409                  __u8 *lease_key, const __le32 lease_state)
3410 {
3411         int rc;
3412         struct smb2_lease_ack *req = NULL;
3413         int flags = CIFS_OBREAK_OP;
3414
3415         cifs_dbg(FYI, "SMB2_lease_break\n");
3416         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
3417         if (rc)
3418                 return rc;
3419
3420         if (encryption_required(tcon))
3421                 flags |= CIFS_TRANSFORM_REQ;
3422
3423         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
3424         req->StructureSize = cpu_to_le16(36);
3425         inc_rfc1001_len(req, 12);
3426
3427         memcpy(req->LeaseKey, lease_key, 16);
3428         req->LeaseState = lease_state;
3429
3430         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
3431         cifs_small_buf_release(req);
3432
3433         if (rc) {
3434                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3435                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
3436         }
3437
3438         return rc;
3439 }