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 protocol negotiate response size: %d\n",
 636                          rsplen);
 637
 638                 /* relax check since Mac returns max bufsize allowed on ioctl */
 639                 if (rsplen > CIFSMaxBufSize)
 640                         return -EIO;
 641         }
 642
 643         /* check validate negotiate info response matches what we got earlier */
 644         if (pneg_rsp->Dialect !=
 645                         cpu_to_le16(tcon->ses->server->vals->protocol_id))
 646                 goto vneg_out;
 647
 648         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 649                 goto vneg_out;
 650
 651         /* do not validate server guid because not saved at negprot time yet */
 652
 653         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 654               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 655                 goto vneg_out;
 656
 657         /* validate negotiate successful */
 658         cifs_dbg(FYI, "validate negotiate info successful\n");
 659         return 0;
 660
 661 vneg_out:
 662         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 663         return -EIO;
 664 }
 665
 666 enum securityEnum
 667 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
 668 {
 669         switch (requested) {
 670         case Kerberos:
 671         case RawNTLMSSP:
 672                 return requested;
 673         case NTLMv2:
 674                 return RawNTLMSSP;
 675         case Unspecified:
 676                 if (server->sec_ntlmssp &&
 677                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
 678                         return RawNTLMSSP;
 679                 if ((server->sec_kerberos || server->sec_mskerberos) &&
 680                         (global_secflags & CIFSSEC_MAY_KRB5))
 681                         return Kerberos;
 682                 /* Fallthrough */
 683         default:
 684                 return Unspecified;
 685         }
 686 }
 687
 688 struct SMB2_sess_data {
 689         unsigned int xid;
 690         struct cifs_ses *ses;
 691         struct nls_table *nls_cp;
 692         void (*func)(struct SMB2_sess_data *);
 693         int result;
 694         u64 previous_session;
 695
 696         /* we will send the SMB in three pieces:
 697          * a fixed length beginning part, an optional
 698          * SPNEGO blob (which can be zero length), and a
 699          * last part which will include the strings
 700          * and rest of bcc area. This allows us to avoid
 701          * a large buffer 17K allocation
 702          */
 703         int buf0_type;
 704         struct kvec iov[2];
 705 };
 706
 707 static int
 708 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
 709 {
 710         int rc;
 711         struct cifs_ses *ses = sess_data->ses;
 712         struct smb2_sess_setup_req *req;
 713         struct TCP_Server_Info *server = ses->server;
 714
 715         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 716         if (rc)
 717                 return rc;
 718
 719         /* First session, not a reauthenticate */
 720         req->hdr.sync_hdr.SessionId = 0;
 721
 722         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
 723         req->PreviousSessionId = sess_data->previous_session;
 724
 725         req->Flags = 0; /* MBZ */
 726         /* to enable echos and oplocks */
 727         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(3);
 728
 729         /* only one of SMB2 signing flags may be set in SMB2 request */
 730         if (server->sign)
 731                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 732         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 733                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 734         else
 735                 req->SecurityMode = 0;
 736
 737         req->Capabilities = 0;
 738         req->Channel = 0; /* MBZ */
 739
 740         sess_data->iov[0].iov_base = (char *)req;
 741         /* 4 for rfc1002 length field and 1 for pad */
 742         sess_data->iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 743         /*
 744          * This variable will be used to clear the buffer
 745          * allocated above in case of any error in the calling function.
 746          */
 747         sess_data->buf0_type = CIFS_SMALL_BUFFER;
 748
 749         return 0;
 750 }
 751
 752 static void
 753 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
 754 {
 755         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
 756         sess_data->buf0_type = CIFS_NO_BUFFER;
 757 }
 758
 759 static int
 760 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
 761 {
 762         int rc;
 763         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
 764         struct kvec rsp_iov = { NULL, 0 };
 765
 766         /* Testing shows that buffer offset must be at location of Buffer[0] */
 767         req->SecurityBufferOffset =
 768                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 769                         1 /* pad */ - 4 /* rfc1001 len */);
 770         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
 771
 772         inc_rfc1001_len(req, sess_data->iov[1].iov_len - 1 /* pad */);
 773
 774         /* BB add code to build os and lm fields */
 775
 776         rc = SendReceive2(sess_data->xid, sess_data->ses,
 777                                 sess_data->iov, 2,
 778                                 &sess_data->buf0_type,
 779                                 CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
 780         cifs_small_buf_release(sess_data->iov[0].iov_base);
 781         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
 782
 783         return rc;
 784 }
 785
 786 static int
 787 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
 788 {
 789         int rc = 0;
 790         struct cifs_ses *ses = sess_data->ses;
 791
 792         mutex_lock(&ses->server->srv_mutex);
 793         if (ses->server->ops->generate_signingkey) {
 794                 rc = ses->server->ops->generate_signingkey(ses);
 795                 if (rc) {
 796                         cifs_dbg(FYI,
 797                                 "SMB3 session key generation failed\n");
 798                         mutex_unlock(&ses->server->srv_mutex);
 799                         return rc;
 800                 }
 801         }
 802         if (!ses->server->session_estab) {
 803                 ses->server->sequence_number = 0x2;
 804                 ses->server->session_estab = true;
 805         }
 806         mutex_unlock(&ses->server->srv_mutex);
 807
 808         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 809         spin_lock(&GlobalMid_Lock);
 810         ses->status = CifsGood;
 811         ses->need_reconnect = false;
 812         spin_unlock(&GlobalMid_Lock);
 813         return rc;
 814 }
 815
 816 #ifdef CONFIG_CIFS_UPCALL
 817 static void
 818 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
 819 {
 820         int rc;
 821         struct cifs_ses *ses = sess_data->ses;
 822         struct cifs_spnego_msg *msg;
 823         struct key *spnego_key = NULL;
 824         struct smb2_sess_setup_rsp *rsp = NULL;
 825
 826         rc = SMB2_sess_alloc_buffer(sess_data);
 827         if (rc)
 828                 goto out;
 829
 830         spnego_key = cifs_get_spnego_key(ses);
 831         if (IS_ERR(spnego_key)) {
 832                 rc = PTR_ERR(spnego_key);
 833                 spnego_key = NULL;
 834                 goto out;
 835         }
 836
 837         msg = spnego_key->payload.data[0];
 838         /*
 839          * check version field to make sure that cifs.upcall is
 840          * sending us a response in an expected form
 841          */
 842         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
 843                 cifs_dbg(VFS,
 844                           "bad cifs.upcall version. Expected %d got %d",
 845                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
 846                 rc = -EKEYREJECTED;
 847                 goto out_put_spnego_key;
 848         }
 849
 850         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
 851                                          GFP_KERNEL);
 852         if (!ses->auth_key.response) {
 853                 cifs_dbg(VFS,
 854                         "Kerberos can't allocate (%u bytes) memory",
 855                         msg->sesskey_len);
 856                 rc = -ENOMEM;
 857                 goto out_put_spnego_key;
 858         }
 859         ses->auth_key.len = msg->sesskey_len;
 860
 861         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
 862         sess_data->iov[1].iov_len = msg->secblob_len;
 863
 864         rc = SMB2_sess_sendreceive(sess_data);
 865         if (rc)
 866                 goto out_put_spnego_key;
 867
 868         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
 869         ses->Suid = rsp->hdr.sync_hdr.SessionId;
 870
 871         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 872
 873         rc = SMB2_sess_establish_session(sess_data);
 874 out_put_spnego_key:
 875         key_invalidate(spnego_key);
 876         key_put(spnego_key);
 877 out:
 878         sess_data->result = rc;
 879         sess_data->func = NULL;
 880         SMB2_sess_free_buffer(sess_data);
 881 }
 882 #else
 883 static void
 884 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
 885 {
 886         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
 887         sess_data->result = -EOPNOTSUPP;
 888         sess_data->func = NULL;
 889 }
 890 #endif
 891
 892 static void
 893 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
 894
 895 static void
 896 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
 897 {
 898         int rc;
 899         struct cifs_ses *ses = sess_data->ses;
 900         struct smb2_sess_setup_rsp *rsp = NULL;
 901         char *ntlmssp_blob = NULL;
 902         bool use_spnego = false; /* else use raw ntlmssp */
 903         u16 blob_length = 0;
 904
 905         /*
 906          * If memory allocation is successful, caller of this function
 907          * frees it.
 908          */
 909         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 910         if (!ses->ntlmssp) {
 911                 rc = -ENOMEM;
 912                 goto out_err;
 913         }
 914         ses->ntlmssp->sesskey_per_smbsess = true;
 915
 916         rc = SMB2_sess_alloc_buffer(sess_data);
 917         if (rc)
 918                 goto out_err;
 919
 920         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 921                                GFP_KERNEL);
 922         if (ntlmssp_blob == NULL) {
 923                 rc = -ENOMEM;
 924                 goto out;
 925         }
 926
 927         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 928         if (use_spnego) {
 929                 /* BB eventually need to add this */
 930                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 931                 rc = -EOPNOTSUPP;
 932                 goto out;
 933         } else {
 934                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 935                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 936         }
 937         sess_data->iov[1].iov_base = ntlmssp_blob;
 938         sess_data->iov[1].iov_len = blob_length;
 939
 940         rc = SMB2_sess_sendreceive(sess_data);
 941         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
 942
 943         /* If true, rc here is expected and not an error */
 944         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
 945                 rsp->hdr.sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
 946                 rc = 0;
 947
 948         if (rc)
 949                 goto out;
 950
 951         if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 952                         le16_to_cpu(rsp->SecurityBufferOffset)) {
 953                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 954                         le16_to_cpu(rsp->SecurityBufferOffset));
 955                 rc = -EIO;
 956                 goto out;
 957         }
 958         rc = decode_ntlmssp_challenge(rsp->Buffer,
 959                         le16_to_cpu(rsp->SecurityBufferLength), ses);
 960         if (rc)
 961                 goto out;
 962
 963         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
 964
 965
 966         ses->Suid = rsp->hdr.sync_hdr.SessionId;
 967         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 968
 969 out:
 970         kfree(ntlmssp_blob);
 971         SMB2_sess_free_buffer(sess_data);
 972         if (!rc) {
 973                 sess_data->result = 0;
 974                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
 975                 return;
 976         }
 977 out_err:
 978         kfree(ses->ntlmssp);
 979         ses->ntlmssp = NULL;
 980         sess_data->result = rc;
 981         sess_data->func = NULL;
 982 }
 983
 984 static void
 985 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
 986 {
 987         int rc;
 988         struct cifs_ses *ses = sess_data->ses;
 989         struct smb2_sess_setup_req *req;
 990         struct smb2_sess_setup_rsp *rsp = NULL;
 991         unsigned char *ntlmssp_blob = NULL;
 992         bool use_spnego = false; /* else use raw ntlmssp */
 993         u16 blob_length = 0;
 994
 995         rc = SMB2_sess_alloc_buffer(sess_data);
 996         if (rc)
 997                 goto out;
 998
 999         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1000         req->hdr.sync_hdr.SessionId = ses->Suid;
1001
1002         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1003                                         sess_data->nls_cp);
1004         if (rc) {
1005                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1006                 goto out;
1007         }
1008
1009         if (use_spnego) {
1010                 /* BB eventually need to add this */
1011                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1012                 rc = -EOPNOTSUPP;
1013                 goto out;
1014         }
1015         sess_data->iov[1].iov_base = ntlmssp_blob;
1016         sess_data->iov[1].iov_len = blob_length;
1017
1018         rc = SMB2_sess_sendreceive(sess_data);
1019         if (rc)
1020                 goto out;
1021
1022         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1023
1024         ses->Suid = rsp->hdr.sync_hdr.SessionId;
1025         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1026
1027         rc = SMB2_sess_establish_session(sess_data);
1028 out:
1029         kfree(ntlmssp_blob);
1030         SMB2_sess_free_buffer(sess_data);
1031         kfree(ses->ntlmssp);
1032         ses->ntlmssp = NULL;
1033         sess_data->result = rc;
1034         sess_data->func = NULL;
1035 }
1036
1037 static int
1038 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1039 {
1040         int type;
1041
1042         type = smb2_select_sectype(ses->server, ses->sectype);
1043         cifs_dbg(FYI, "sess setup type %d\n", type);
1044         if (type == Unspecified) {
1045                 cifs_dbg(VFS,
1046                         "Unable to select appropriate authentication method!");
1047                 return -EINVAL;
1048         }
1049
1050         switch (type) {
1051         case Kerberos:
1052                 sess_data->func = SMB2_auth_kerberos;
1053                 break;
1054         case RawNTLMSSP:
1055                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1056                 break;
1057         default:
1058                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1059                 return -EOPNOTSUPP;
1060         }
1061
1062         return 0;
1063 }
1064
1065 int
1066 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1067                 const struct nls_table *nls_cp)
1068 {
1069         int rc = 0;
1070         struct TCP_Server_Info *server = ses->server;
1071         struct SMB2_sess_data *sess_data;
1072
1073         cifs_dbg(FYI, "Session Setup\n");
1074
1075         if (!server) {
1076                 WARN(1, "%s: server is NULL!\n", __func__);
1077                 return -EIO;
1078         }
1079
1080         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1081         if (!sess_data)
1082                 return -ENOMEM;
1083
1084         rc = SMB2_select_sec(ses, sess_data);
1085         if (rc)
1086                 goto out;
1087         sess_data->xid = xid;
1088         sess_data->ses = ses;
1089         sess_data->buf0_type = CIFS_NO_BUFFER;
1090         sess_data->nls_cp = (struct nls_table *) nls_cp;
1091
1092         while (sess_data->func)
1093                 sess_data->func(sess_data);
1094
1095         rc = sess_data->result;
1096 out:
1097         kfree(sess_data);
1098         return rc;
1099 }
1100
1101 int
1102 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1103 {
1104         struct smb2_logoff_req *req; /* response is also trivial struct */
1105         int rc = 0;
1106         struct TCP_Server_Info *server;
1107         int flags = 0;
1108
1109         cifs_dbg(FYI, "disconnect session %p\n", ses);
1110
1111         if (ses && (ses->server))
1112                 server = ses->server;
1113         else
1114                 return -EIO;
1115
1116         /* no need to send SMB logoff if uid already closed due to reconnect */
1117         if (ses->need_reconnect)
1118                 goto smb2_session_already_dead;
1119
1120         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
1121         if (rc)
1122                 return rc;
1123
1124          /* since no tcon, smb2_init can not do this, so do here */
1125         req->hdr.sync_hdr.SessionId = ses->Suid;
1126
1127         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1128                 flags |= CIFS_TRANSFORM_REQ;
1129         else if (server->sign)
1130                 req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1131
1132         rc = SendReceiveNoRsp(xid, ses, (char *) req, flags);
1133         cifs_small_buf_release(req);
1134         /*
1135          * No tcon so can't do
1136          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1137          */
1138
1139 smb2_session_already_dead:
1140         return rc;
1141 }
1142
1143 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1144 {
1145         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1146 }
1147
1148 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1149
1150 /* These are similar values to what Windows uses */
1151 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1152 {
1153         tcon->max_chunks = 256;
1154         tcon->max_bytes_chunk = 1048576;
1155         tcon->max_bytes_copy = 16777216;
1156 }
1157
1158 int
1159 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1160           struct cifs_tcon *tcon, const struct nls_table *cp)
1161 {
1162         struct smb2_tree_connect_req *req;
1163         struct smb2_tree_connect_rsp *rsp = NULL;
1164         struct kvec iov[2];
1165         struct kvec rsp_iov;
1166         int rc = 0;
1167         int resp_buftype;
1168         int unc_path_len;
1169         struct TCP_Server_Info *server;
1170         __le16 *unc_path = NULL;
1171         int flags = 0;
1172
1173         cifs_dbg(FYI, "TCON\n");
1174
1175         if ((ses->server) && tree)
1176                 server = ses->server;
1177         else
1178                 return -EIO;
1179
1180         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1181         if (unc_path == NULL)
1182                 return -ENOMEM;
1183
1184         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1185         unc_path_len *= 2;
1186         if (unc_path_len < 2) {
1187                 kfree(unc_path);
1188                 return -EINVAL;
1189         }
1190
1191         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1192         if (tcon)
1193                 tcon->tid = 0;
1194
1195         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
1196         if (rc) {
1197                 kfree(unc_path);
1198                 return rc;
1199         }
1200
1201         if (tcon == NULL) {
1202                 if ((ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA))
1203                         flags |= CIFS_TRANSFORM_REQ;
1204
1205                 /* since no tcon, smb2_init can not do this, so do here */
1206                 req->hdr.sync_hdr.SessionId = ses->Suid;
1207                 if (ses->server->sign)
1208                         req->hdr.sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1209         } else if (encryption_required(tcon))
1210                 flags |= CIFS_TRANSFORM_REQ;
1211
1212         iov[0].iov_base = (char *)req;
1213         /* 4 for rfc1002 length field and 1 for pad */
1214         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1215
1216         /* Testing shows that buffer offset must be at location of Buffer[0] */
1217         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1218                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
1219         req->PathLength = cpu_to_le16(unc_path_len - 2);
1220         iov[1].iov_base = unc_path;
1221         iov[1].iov_len = unc_path_len;
1222
1223         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
1224
1225         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
1226         cifs_small_buf_release(req);
1227         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1228
1229         if (rc != 0) {
1230                 if (tcon) {
1231                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1232                         tcon->need_reconnect = true;
1233                 }
1234                 goto tcon_error_exit;
1235         }
1236
1237         if (tcon == NULL) {
1238                 ses->ipc_tid = rsp->hdr.sync_hdr.TreeId;
1239                 goto tcon_exit;
1240         }
1241
1242         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
1243                 cifs_dbg(FYI, "connection to disk share\n");
1244         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
1245                 tcon->ipc = true;
1246                 cifs_dbg(FYI, "connection to pipe share\n");
1247         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
1248                 tcon->print = true;
1249                 cifs_dbg(FYI, "connection to printer\n");
1250         } else {
1251                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1252                 rc = -EOPNOTSUPP;
1253                 goto tcon_error_exit;
1254         }
1255
1256         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1257         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1258         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1259         tcon->tidStatus = CifsGood;
1260         tcon->need_reconnect = false;
1261         tcon->tid = rsp->hdr.sync_hdr.TreeId;
1262         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1263
1264         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1265             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1266                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1267
1268         if (tcon->seal &&
1269             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1270                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1271
1272         init_copy_chunk_defaults(tcon);
1273         if (tcon->ses->server->ops->validate_negotiate)
1274                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1275 tcon_exit:
1276         free_rsp_buf(resp_buftype, rsp);
1277         kfree(unc_path);
1278         return rc;
1279
1280 tcon_error_exit:
1281         if (rsp->hdr.sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1282                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1283         }
1284         goto tcon_exit;
1285 }
1286
1287 int
1288 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1289 {
1290         struct smb2_tree_disconnect_req *req; /* response is trivial */
1291         int rc = 0;
1292         struct TCP_Server_Info *server;
1293         struct cifs_ses *ses = tcon->ses;
1294         int flags = 0;
1295
1296         cifs_dbg(FYI, "Tree Disconnect\n");
1297
1298         if (ses && (ses->server))
1299                 server = ses->server;
1300         else
1301                 return -EIO;
1302
1303         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1304                 return 0;
1305
1306         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
1307         if (rc)
1308                 return rc;
1309
1310         if (encryption_required(tcon))
1311                 flags |= CIFS_TRANSFORM_REQ;
1312
1313         rc = SendReceiveNoRsp(xid, ses, (char *)req, flags);
1314         cifs_small_buf_release(req);
1315         if (rc)
1316                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1317
1318         return rc;
1319 }
1320
1321
1322 static struct create_durable *
1323 create_durable_buf(void)
1324 {
1325         struct create_durable *buf;
1326
1327         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1328         if (!buf)
1329                 return NULL;
1330
1331         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1332                                         (struct create_durable, Data));
1333         buf->ccontext.DataLength = cpu_to_le32(16);
1334         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1335                                 (struct create_durable, Name));
1336         buf->ccontext.NameLength = cpu_to_le16(4);
1337         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1338         buf->Name[0] = 'D';
1339         buf->Name[1] = 'H';
1340         buf->Name[2] = 'n';
1341         buf->Name[3] = 'Q';
1342         return buf;
1343 }
1344
1345 static struct create_durable *
1346 create_reconnect_durable_buf(struct cifs_fid *fid)
1347 {
1348         struct create_durable *buf;
1349
1350         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1351         if (!buf)
1352                 return NULL;
1353
1354         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1355                                         (struct create_durable, Data));
1356         buf->ccontext.DataLength = cpu_to_le32(16);
1357         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1358                                 (struct create_durable, Name));
1359         buf->ccontext.NameLength = cpu_to_le16(4);
1360         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1361         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1362         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1363         buf->Name[0] = 'D';
1364         buf->Name[1] = 'H';
1365         buf->Name[2] = 'n';
1366         buf->Name[3] = 'C';
1367         return buf;
1368 }
1369
1370 static __u8
1371 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1372                   unsigned int *epoch)
1373 {
1374         char *data_offset;
1375         struct create_context *cc;
1376         unsigned int next;
1377         unsigned int remaining;
1378         char *name;
1379
1380         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1381         remaining = le32_to_cpu(rsp->CreateContextsLength);
1382         cc = (struct create_context *)data_offset;
1383         while (remaining >= sizeof(struct create_context)) {
1384                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1385                 if (le16_to_cpu(cc->NameLength) == 4 &&
1386                     strncmp(name, "RqLs", 4) == 0)
1387                         return server->ops->parse_lease_buf(cc, epoch);
1388
1389                 next = le32_to_cpu(cc->Next);
1390                 if (!next)
1391                         break;
1392                 remaining -= next;
1393                 cc = (struct create_context *)((char *)cc + next);
1394         }
1395
1396         return 0;
1397 }
1398
1399 static int
1400 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1401                   unsigned int *num_iovec, __u8 *oplock)
1402 {
1403         struct smb2_create_req *req = iov[0].iov_base;
1404         unsigned int num = *num_iovec;
1405
1406         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1407         if (iov[num].iov_base == NULL)
1408                 return -ENOMEM;
1409         iov[num].iov_len = server->vals->create_lease_size;
1410         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1411         if (!req->CreateContextsOffset)
1412                 req->CreateContextsOffset = cpu_to_le32(
1413                                 sizeof(struct smb2_create_req) - 4 +
1414                                 iov[num - 1].iov_len);
1415         le32_add_cpu(&req->CreateContextsLength,
1416                      server->vals->create_lease_size);
1417         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1418         *num_iovec = num + 1;
1419         return 0;
1420 }
1421
1422 static struct create_durable_v2 *
1423 create_durable_v2_buf(struct cifs_fid *pfid)
1424 {
1425         struct create_durable_v2 *buf;
1426
1427         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1428         if (!buf)
1429                 return NULL;
1430
1431         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1432                                         (struct create_durable_v2, dcontext));
1433         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1434         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1435                                 (struct create_durable_v2, Name));
1436         buf->ccontext.NameLength = cpu_to_le16(4);
1437
1438         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1439         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1440         generate_random_uuid(buf->dcontext.CreateGuid);
1441         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1442
1443         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1444         buf->Name[0] = 'D';
1445         buf->Name[1] = 'H';
1446         buf->Name[2] = '2';
1447         buf->Name[3] = 'Q';
1448         return buf;
1449 }
1450
1451 static struct create_durable_handle_reconnect_v2 *
1452 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1453 {
1454         struct create_durable_handle_reconnect_v2 *buf;
1455
1456         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1457                         GFP_KERNEL);
1458         if (!buf)
1459                 return NULL;
1460
1461         buf->ccontext.DataOffset =
1462                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1463                                      dcontext));
1464         buf->ccontext.DataLength =
1465                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1466         buf->ccontext.NameOffset =
1467                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1468                             Name));
1469         buf->ccontext.NameLength = cpu_to_le16(4);
1470
1471         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1472         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1473         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1474         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1475
1476         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1477         buf->Name[0] = 'D';
1478         buf->Name[1] = 'H';
1479         buf->Name[2] = '2';
1480         buf->Name[3] = 'C';
1481         return buf;
1482 }
1483
1484 static int
1485 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1486                     struct cifs_open_parms *oparms)
1487 {
1488         struct smb2_create_req *req = iov[0].iov_base;
1489         unsigned int num = *num_iovec;
1490
1491         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1492         if (iov[num].iov_base == NULL)
1493                 return -ENOMEM;
1494         iov[num].iov_len = sizeof(struct create_durable_v2);
1495         if (!req->CreateContextsOffset)
1496                 req->CreateContextsOffset =
1497                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1498                                                                 iov[1].iov_len);
1499         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1500         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable_v2));
1501         *num_iovec = num + 1;
1502         return 0;
1503 }
1504
1505 static int
1506 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1507                     struct cifs_open_parms *oparms)
1508 {
1509         struct smb2_create_req *req = iov[0].iov_base;
1510         unsigned int num = *num_iovec;
1511
1512         /* indicate that we don't need to relock the file */
1513         oparms->reconnect = false;
1514
1515         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1516         if (iov[num].iov_base == NULL)
1517                 return -ENOMEM;
1518         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1519         if (!req->CreateContextsOffset)
1520                 req->CreateContextsOffset =
1521                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1522                                                                 iov[1].iov_len);
1523         le32_add_cpu(&req->CreateContextsLength,
1524                         sizeof(struct create_durable_handle_reconnect_v2));
1525         inc_rfc1001_len(&req->hdr,
1526                         sizeof(struct create_durable_handle_reconnect_v2));
1527         *num_iovec = num + 1;
1528         return 0;
1529 }
1530
1531 static int
1532 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1533                     struct cifs_open_parms *oparms, bool use_persistent)
1534 {
1535         struct smb2_create_req *req = iov[0].iov_base;
1536         unsigned int num = *num_iovec;
1537
1538         if (use_persistent) {
1539                 if (oparms->reconnect)
1540                         return add_durable_reconnect_v2_context(iov, num_iovec,
1541                                                                 oparms);
1542                 else
1543                         return add_durable_v2_context(iov, num_iovec, oparms);
1544         }
1545
1546         if (oparms->reconnect) {
1547                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1548                 /* indicate that we don't need to relock the file */
1549                 oparms->reconnect = false;
1550         } else
1551                 iov[num].iov_base = create_durable_buf();
1552         if (iov[num].iov_base == NULL)
1553                 return -ENOMEM;
1554         iov[num].iov_len = sizeof(struct create_durable);
1555         if (!req->CreateContextsOffset)
1556                 req->CreateContextsOffset =
1557                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1558                                                                 iov[1].iov_len);
1559         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1560         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1561         *num_iovec = num + 1;
1562         return 0;
1563 }
1564
1565 static int
1566 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1567                             const char *treename, const __le16 *path)
1568 {
1569         int treename_len, path_len;
1570         struct nls_table *cp;
1571         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1572
1573         /*
1574          * skip leading "\\"
1575          */
1576         treename_len = strlen(treename);
1577         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1578                 return -EINVAL;
1579
1580         treename += 2;
1581         treename_len -= 2;
1582
1583         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1584
1585         /*
1586          * make room for one path separator between the treename and
1587          * path
1588          */
1589         *out_len = treename_len + 1 + path_len;
1590
1591         /*
1592          * final path needs to be null-terminated UTF16 with a
1593          * size aligned to 8
1594          */
1595
1596         *out_size = roundup((*out_len+1)*2, 8);
1597         *out_path = kzalloc(*out_size, GFP_KERNEL);
1598         if (!*out_path)
1599                 return -ENOMEM;
1600
1601         cp = load_nls_default();
1602         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
1603         UniStrcat(*out_path, sep);
1604         UniStrcat(*out_path, path);
1605         unload_nls(cp);
1606
1607         return 0;
1608 }
1609
1610 int
1611 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1612           __u8 *oplock, struct smb2_file_all_info *buf,
1613           struct smb2_err_rsp **err_buf)
1614 {
1615         struct smb2_create_req *req;
1616         struct smb2_create_rsp *rsp;
1617         struct TCP_Server_Info *server;
1618         struct cifs_tcon *tcon = oparms->tcon;
1619         struct cifs_ses *ses = tcon->ses;
1620         struct kvec iov[4];
1621         struct kvec rsp_iov;
1622         int resp_buftype;
1623         int uni_path_len;
1624         __le16 *copy_path = NULL;
1625         int copy_size;
1626         int rc = 0;
1627         unsigned int n_iov = 2;
1628         __u32 file_attributes = 0;
1629         char *dhc_buf = NULL, *lc_buf = NULL;
1630         int flags = 0;
1631
1632         cifs_dbg(FYI, "create/open\n");
1633
1634         if (ses && (ses->server))
1635                 server = ses->server;
1636         else
1637                 return -EIO;
1638
1639         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1640         if (rc)
1641                 return rc;
1642
1643         if (encryption_required(tcon))
1644                 flags |= CIFS_TRANSFORM_REQ;
1645
1646         if (oparms->create_options & CREATE_OPTION_READONLY)
1647                 file_attributes |= ATTR_READONLY;
1648         if (oparms->create_options & CREATE_OPTION_SPECIAL)
1649                 file_attributes |= ATTR_SYSTEM;
1650
1651         req->ImpersonationLevel = IL_IMPERSONATION;
1652         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1653         /* File attributes ignored on open (used in create though) */
1654         req->FileAttributes = cpu_to_le32(file_attributes);
1655         req->ShareAccess = FILE_SHARE_ALL_LE;
1656         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1657         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1658
1659         iov[0].iov_base = (char *)req;
1660         /* 4 for rfc1002 length field */
1661         iov[0].iov_len = get_rfc1002_length(req) + 4;
1662         /* -1 since last byte is buf[0] which is sent below (path) */
1663         iov[0].iov_len--;
1664
1665         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1666
1667         /* [MS-SMB2] 2.2.13 NameOffset:
1668          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
1669          * the SMB2 header, the file name includes a prefix that will
1670          * be processed during DFS name normalization as specified in
1671          * section 3.3.5.9. Otherwise, the file name is relative to
1672          * the share that is identified by the TreeId in the SMB2
1673          * header.
1674          */
1675         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
1676                 int name_len;
1677
1678                 req->hdr.sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
1679                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
1680                                                  &name_len,
1681                                                  tcon->treeName, path);
1682                 if (rc)
1683                         return rc;
1684                 req->NameLength = cpu_to_le16(name_len * 2);
1685                 uni_path_len = copy_size;
1686                 path = copy_path;
1687         } else {
1688                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1689                 /* MUST set path len (NameLength) to 0 opening root of share */
1690                 req->NameLength = cpu_to_le16(uni_path_len - 2);
1691                 if (uni_path_len % 8 != 0) {
1692                         copy_size = roundup(uni_path_len, 8);
1693                         copy_path = kzalloc(copy_size, GFP_KERNEL);
1694                         if (!copy_path)
1695                                 return -ENOMEM;
1696                         memcpy((char *)copy_path, (const char *)path,
1697                                uni_path_len);
1698                         uni_path_len = copy_size;
1699                         path = copy_path;
1700                 }
1701         }
1702
1703         iov[1].iov_len = uni_path_len;
1704         iov[1].iov_base = path;
1705         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1706         inc_rfc1001_len(req, uni_path_len - 1);
1707
1708         if (!server->oplocks)
1709                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1710
1711         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1712             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1713                 req->RequestedOplockLevel = *oplock;
1714         else {
1715                 rc = add_lease_context(server, iov, &n_iov, oplock);
1716                 if (rc) {
1717                         cifs_small_buf_release(req);
1718                         kfree(copy_path);
1719                         return rc;
1720                 }
1721                 lc_buf = iov[n_iov-1].iov_base;
1722         }
1723
1724         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1725                 /* need to set Next field of lease context if we request it */
1726                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1727                         struct create_context *ccontext =
1728                             (struct create_context *)iov[n_iov-1].iov_base;
1729                         ccontext->Next =
1730                                 cpu_to_le32(server->vals->create_lease_size);
1731                 }
1732
1733                 rc = add_durable_context(iov, &n_iov, oparms,
1734                                         tcon->use_persistent);
1735                 if (rc) {
1736                         cifs_small_buf_release(req);
1737                         kfree(copy_path);
1738                         kfree(lc_buf);
1739                         return rc;
1740                 }
1741                 dhc_buf = iov[n_iov-1].iov_base;
1742         }
1743
1744         rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov);
1745         cifs_small_buf_release(req);
1746         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
1747
1748         if (rc != 0) {
1749                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1750                 if (err_buf)
1751                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1752                                            GFP_KERNEL);
1753                 goto creat_exit;
1754         }
1755
1756         oparms->fid->persistent_fid = rsp->PersistentFileId;
1757         oparms->fid->volatile_fid = rsp->VolatileFileId;
1758
1759         if (buf) {
1760                 memcpy(buf, &rsp->CreationTime, 32);
1761                 buf->AllocationSize = rsp->AllocationSize;
1762                 buf->EndOfFile = rsp->EndofFile;
1763                 buf->Attributes = rsp->FileAttributes;
1764                 buf->NumberOfLinks = cpu_to_le32(1);
1765                 buf->DeletePending = 0;
1766         }
1767
1768         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1769                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1770         else
1771                 *oplock = rsp->OplockLevel;
1772 creat_exit:
1773         kfree(copy_path);
1774         kfree(lc_buf);
1775         kfree(dhc_buf);
1776         free_rsp_buf(resp_buftype, rsp);
1777         return rc;
1778 }
1779
1780 /*
1781  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1782  */
1783 int
1784 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1785            u64 volatile_fid, u32 opcode, bool is_fsctl, bool use_ipc,
1786            char *in_data, u32 indatalen,
1787            char **out_data, u32 *plen /* returned data len */)
1788 {
1789         struct smb2_ioctl_req *req;
1790         struct smb2_ioctl_rsp *rsp;
1791         struct smb2_sync_hdr *shdr;
1792         struct TCP_Server_Info *server;
1793         struct cifs_ses *ses;
1794         struct kvec iov[2];
1795         struct kvec rsp_iov;
1796         int resp_buftype;
1797         int n_iov;
1798         int rc = 0;
1799         int flags = 0;
1800
1801         cifs_dbg(FYI, "SMB2 IOCTL\n");
1802
1803         if (out_data != NULL)
1804                 *out_data = NULL;
1805
1806         /* zero out returned data len, in case of error */
1807         if (plen)
1808                 *plen = 0;
1809
1810         if (tcon)
1811                 ses = tcon->ses;
1812         else
1813                 return -EIO;
1814
1815         if (ses && (ses->server))
1816                 server = ses->server;
1817         else
1818                 return -EIO;
1819
1820         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1821         if (rc)
1822                 return rc;
1823
1824         if (use_ipc) {
1825                 if (ses->ipc_tid == 0) {
1826                         cifs_small_buf_release(req);
1827                         return -ENOTCONN;
1828                 }
1829
1830                 cifs_dbg(FYI, "replacing tid 0x%x with IPC tid 0x%x\n",
1831                          req->hdr.sync_hdr.TreeId, ses->ipc_tid);
1832                 req->hdr.sync_hdr.TreeId = ses->ipc_tid;
1833         }
1834         if (encryption_required(tcon))
1835                 flags |= CIFS_TRANSFORM_REQ;
1836
1837         req->CtlCode = cpu_to_le32(opcode);
1838         req->PersistentFileId = persistent_fid;
1839         req->VolatileFileId = volatile_fid;
1840
1841         if (indatalen) {
1842                 req->InputCount = cpu_to_le32(indatalen);
1843                 /* do not set InputOffset if no input data */
1844                 req->InputOffset =
1845                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1846                 iov[1].iov_base = in_data;
1847                 iov[1].iov_len = indatalen;
1848                 n_iov = 2;
1849         } else
1850                 n_iov = 1;
1851
1852         req->OutputOffset = 0;
1853         req->OutputCount = 0; /* MBZ */
1854
1855         /*
1856          * Could increase MaxOutputResponse, but that would require more
1857          * than one credit. Windows typically sets this smaller, but for some
1858          * ioctls it may be useful to allow server to send more. No point
1859          * limiting what the server can send as long as fits in one credit
1860          * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
1861          * (by default, note that it can be overridden to make max larger)
1862          * in responses (except for read responses which can be bigger.
1863          * We may want to bump this limit up
1864          */
1865         req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
1866
1867         if (is_fsctl)
1868                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1869         else
1870                 req->Flags = 0;
1871
1872         iov[0].iov_base = (char *)req;
1873
1874         /*
1875          * If no input data, the size of ioctl struct in
1876          * protocol spec still includes a 1 byte data buffer,
1877          * but if input data passed to ioctl, we do not
1878          * want to double count this, so we do not send
1879          * the dummy one byte of data in iovec[0] if sending
1880          * input data (in iovec[1]). We also must add 4 bytes
1881          * in first iovec to allow for rfc1002 length field.
1882          */
1883
1884         if (indatalen) {
1885                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1886                 inc_rfc1001_len(req, indatalen - 1);
1887         } else
1888                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1889
1890
1891         rc = SendReceive2(xid, ses, iov, n_iov, &resp_buftype, flags, &rsp_iov);
1892         cifs_small_buf_release(req);
1893         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
1894
1895         if ((rc != 0) && (rc != -EINVAL)) {
1896                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1897                 goto ioctl_exit;
1898         } else if (rc == -EINVAL) {
1899                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1900                     (opcode != FSCTL_SRV_COPYCHUNK)) {
1901                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1902                         goto ioctl_exit;
1903                 }
1904         }
1905
1906         /* check if caller wants to look at return data or just return rc */
1907         if ((plen == NULL) || (out_data == NULL))
1908                 goto ioctl_exit;
1909
1910         *plen = le32_to_cpu(rsp->OutputCount);
1911
1912         /* We check for obvious errors in the output buffer length and offset */
1913         if (*plen == 0)
1914                 goto ioctl_exit; /* server returned no data */
1915         else if (*plen > 0xFF00) {
1916                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1917                 *plen = 0;
1918                 rc = -EIO;
1919                 goto ioctl_exit;
1920         }
1921
1922         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1923                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1924                         le32_to_cpu(rsp->OutputOffset));
1925                 *plen = 0;
1926                 rc = -EIO;
1927                 goto ioctl_exit;
1928         }
1929
1930         *out_data = kmalloc(*plen, GFP_KERNEL);
1931         if (*out_data == NULL) {
1932                 rc = -ENOMEM;
1933                 goto ioctl_exit;
1934         }
1935
1936         shdr = get_sync_hdr(rsp);
1937         memcpy(*out_data, (char *)shdr + le32_to_cpu(rsp->OutputOffset), *plen);
1938 ioctl_exit:
1939         free_rsp_buf(resp_buftype, rsp);
1940         return rc;
1941 }
1942
1943 /*
1944  *   Individual callers to ioctl worker function follow
1945  */
1946
1947 int
1948 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1949                      u64 persistent_fid, u64 volatile_fid)
1950 {
1951         int rc;
1952         struct  compress_ioctl fsctl_input;
1953         char *ret_data = NULL;
1954
1955         fsctl_input.CompressionState =
1956                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1957
1958         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1959                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1960                         false /* use_ipc */,
1961                         (char *)&fsctl_input /* data input */,
1962                         2 /* in data len */, &ret_data /* out data */, NULL);
1963
1964         cifs_dbg(FYI, "set compression rc %d\n", rc);
1965
1966         return rc;
1967 }
1968
1969 int
1970 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1971            u64 persistent_fid, u64 volatile_fid)
1972 {
1973         struct smb2_close_req *req;
1974         struct smb2_close_rsp *rsp;
1975         struct TCP_Server_Info *server;
1976         struct cifs_ses *ses = tcon->ses;
1977         struct kvec iov[1];
1978         struct kvec rsp_iov;
1979         int resp_buftype;
1980         int rc = 0;
1981         int flags = 0;
1982
1983         cifs_dbg(FYI, "Close\n");
1984
1985         if (ses && (ses->server))
1986                 server = ses->server;
1987         else
1988                 return -EIO;
1989
1990         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1991         if (rc)
1992                 return rc;
1993
1994         if (encryption_required(tcon))
1995                 flags |= CIFS_TRANSFORM_REQ;
1996
1997         req->PersistentFileId = persistent_fid;
1998         req->VolatileFileId = volatile_fid;
1999
2000         iov[0].iov_base = (char *)req;
2001         /* 4 for rfc1002 length field */
2002         iov[0].iov_len = get_rfc1002_length(req) + 4;
2003
2004         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2005         cifs_small_buf_release(req);
2006         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2007
2008         if (rc != 0) {
2009                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2010                 goto close_exit;
2011         }
2012
2013         /* BB FIXME - decode close response, update inode for caching */
2014
2015 close_exit:
2016         free_rsp_buf(resp_buftype, rsp);
2017         return rc;
2018 }
2019
2020 static int
2021 validate_buf(unsigned int offset, unsigned int buffer_length,
2022              struct smb2_hdr *hdr, unsigned int min_buf_size)
2023
2024 {
2025         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
2026         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
2027         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2028         char *end_of_buf = begin_of_buf + buffer_length;
2029
2030
2031         if (buffer_length < min_buf_size) {
2032                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2033                          buffer_length, min_buf_size);
2034                 return -EINVAL;
2035         }
2036
2037         /* check if beyond RFC1001 maximum length */
2038         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2039                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2040                          buffer_length, smb_len);
2041                 return -EINVAL;
2042         }
2043
2044         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2045                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2046                 return -EINVAL;
2047         }
2048
2049         return 0;
2050 }
2051
2052 /*
2053  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2054  * Caller must free buffer.
2055  */
2056 static int
2057 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
2058                       struct smb2_hdr *hdr, unsigned int minbufsize,
2059                       char *data)
2060
2061 {
2062         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
2063         int rc;
2064
2065         if (!data)
2066                 return -EINVAL;
2067
2068         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
2069         if (rc)
2070                 return rc;
2071
2072         memcpy(data, begin_of_buf, buffer_length);
2073
2074         return 0;
2075 }
2076
2077 static int
2078 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2079            u64 persistent_fid, u64 volatile_fid, u8 info_class,
2080            size_t output_len, size_t min_len, void *data)
2081 {
2082         struct smb2_query_info_req *req;
2083         struct smb2_query_info_rsp *rsp = NULL;
2084         struct kvec iov[2];
2085         struct kvec rsp_iov;
2086         int rc = 0;
2087         int resp_buftype;
2088         struct TCP_Server_Info *server;
2089         struct cifs_ses *ses = tcon->ses;
2090         int flags = 0;
2091
2092         cifs_dbg(FYI, "Query Info\n");
2093
2094         if (ses && (ses->server))
2095                 server = ses->server;
2096         else
2097                 return -EIO;
2098
2099         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2100         if (rc)
2101                 return rc;
2102
2103         if (encryption_required(tcon))
2104                 flags |= CIFS_TRANSFORM_REQ;
2105
2106         req->InfoType = SMB2_O_INFO_FILE;
2107         req->FileInfoClass = info_class;
2108         req->PersistentFileId = persistent_fid;
2109         req->VolatileFileId = volatile_fid;
2110         /* 4 for rfc1002 length field and 1 for Buffer */
2111         req->InputBufferOffset =
2112                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2113         req->OutputBufferLength = cpu_to_le32(output_len);
2114
2115         iov[0].iov_base = (char *)req;
2116         /* 4 for rfc1002 length field */
2117         iov[0].iov_len = get_rfc1002_length(req) + 4;
2118
2119         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2120         cifs_small_buf_release(req);
2121         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2122
2123         if (rc) {
2124                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2125                 goto qinf_exit;
2126         }
2127
2128         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
2129                                    le32_to_cpu(rsp->OutputBufferLength),
2130                                    &rsp->hdr, min_len, data);
2131
2132 qinf_exit:
2133         free_rsp_buf(resp_buftype, rsp);
2134         return rc;
2135 }
2136
2137 int
2138 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2139                 u64 persistent_fid, u64 volatile_fid,
2140                 struct smb2_file_all_info *data)
2141 {
2142         return query_info(xid, tcon, persistent_fid, volatile_fid,
2143                           FILE_ALL_INFORMATION,
2144                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2145                           sizeof(struct smb2_file_all_info), data);
2146 }
2147
2148 int
2149 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2150                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2151 {
2152         return query_info(xid, tcon, persistent_fid, volatile_fid,
2153                           FILE_INTERNAL_INFORMATION,
2154                           sizeof(struct smb2_file_internal_info),
2155                           sizeof(struct smb2_file_internal_info), uniqueid);
2156 }
2157
2158 /*
2159  * This is a no-op for now. We're not really interested in the reply, but
2160  * rather in the fact that the server sent one and that server->lstrp
2161  * gets updated.
2162  *
2163  * FIXME: maybe we should consider checking that the reply matches request?
2164  */
2165 static void
2166 smb2_echo_callback(struct mid_q_entry *mid)
2167 {
2168         struct TCP_Server_Info *server = mid->callback_data;
2169         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2170         unsigned int credits_received = 1;
2171
2172         if (mid->mid_state == MID_RESPONSE_RECEIVED)
2173                 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2174
2175         mutex_lock(&server->srv_mutex);
2176         DeleteMidQEntry(mid);
2177         mutex_unlock(&server->srv_mutex);
2178         add_credits(server, credits_received, CIFS_ECHO_OP);
2179 }
2180
2181 void smb2_reconnect_server(struct work_struct *work)
2182 {
2183         struct TCP_Server_Info *server = container_of(work,
2184                                         struct TCP_Server_Info, reconnect.work);
2185         struct cifs_ses *ses;
2186         struct cifs_tcon *tcon, *tcon2;
2187         struct list_head tmp_list;
2188         int tcon_exist = false;
2189         int rc;
2190         int resched = false;
2191
2192
2193         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2194         mutex_lock(&server->reconnect_mutex);
2195
2196         INIT_LIST_HEAD(&tmp_list);
2197         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2198
2199         spin_lock(&cifs_tcp_ses_lock);
2200         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2201                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2202                         if (tcon->need_reconnect || tcon->need_reopen_files) {
2203                                 tcon->tc_count++;
2204                                 list_add_tail(&tcon->rlist, &tmp_list);
2205                                 tcon_exist = true;
2206                         }
2207                 }
2208         }
2209         /*
2210          * Get the reference to server struct to be sure that the last call of
2211          * cifs_put_tcon() in the loop below won't release the server pointer.
2212          */
2213         if (tcon_exist)
2214                 server->srv_count++;
2215
2216         spin_unlock(&cifs_tcp_ses_lock);
2217
2218         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2219                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2220                 if (!rc)
2221                         cifs_reopen_persistent_handles(tcon);
2222                 else
2223                         resched = true;
2224                 list_del_init(&tcon->rlist);
2225                 cifs_put_tcon(tcon);
2226         }
2227
2228         cifs_dbg(FYI, "Reconnecting tcons finished\n");
2229         if (resched)
2230                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2231         mutex_unlock(&server->reconnect_mutex);
2232
2233         /* now we can safely release srv struct */
2234         if (tcon_exist)
2235                 cifs_put_tcp_session(server, 1);
2236 }
2237
2238 int
2239 SMB2_echo(struct TCP_Server_Info *server)
2240 {
2241         struct smb2_echo_req *req;
2242         int rc = 0;
2243         struct kvec iov[2];
2244         struct smb_rqst rqst = { .rq_iov = iov,
2245                                  .rq_nvec = 2 };
2246
2247         cifs_dbg(FYI, "In echo request\n");
2248
2249         if (server->tcpStatus == CifsNeedNegotiate) {
2250                 /* No need to send echo on newly established connections */
2251                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2252                 return rc;
2253         }
2254
2255         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
2256         if (rc)
2257                 return rc;
2258
2259         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
2260
2261         /* 4 for rfc1002 length field */
2262         iov[0].iov_len = 4;
2263         iov[0].iov_base = (char *)req;
2264         iov[1].iov_len = get_rfc1002_length(req);
2265         iov[1].iov_base = (char *)req + 4;
2266
2267         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2268                              server, CIFS_ECHO_OP);
2269         if (rc)
2270                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2271
2272         cifs_small_buf_release(req);
2273         return rc;
2274 }
2275
2276 int
2277 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2278            u64 volatile_fid)
2279 {
2280         struct smb2_flush_req *req;
2281         struct TCP_Server_Info *server;
2282         struct cifs_ses *ses = tcon->ses;
2283         struct kvec iov[1];
2284         struct kvec rsp_iov;
2285         int resp_buftype;
2286         int rc = 0;
2287         int flags = 0;
2288
2289         cifs_dbg(FYI, "Flush\n");
2290
2291         if (ses && (ses->server))
2292                 server = ses->server;
2293         else
2294                 return -EIO;
2295
2296         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
2297         if (rc)
2298                 return rc;
2299
2300         if (encryption_required(tcon))
2301                 flags |= CIFS_TRANSFORM_REQ;
2302
2303         req->PersistentFileId = persistent_fid;
2304         req->VolatileFileId = volatile_fid;
2305
2306         iov[0].iov_base = (char *)req;
2307         /* 4 for rfc1002 length field */
2308         iov[0].iov_len = get_rfc1002_length(req) + 4;
2309
2310         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags, &rsp_iov);
2311         cifs_small_buf_release(req);
2312
2313         if (rc != 0)
2314                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
2315
2316         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2317         return rc;
2318 }
2319
2320 /*
2321  * To form a chain of read requests, any read requests after the first should
2322  * have the end_of_chain boolean set to true.
2323  */
2324 static int
2325 smb2_new_read_req(void **buf, unsigned int *total_len,
2326                   struct cifs_io_parms *io_parms, unsigned int remaining_bytes,
2327                   int request_type)
2328 {
2329         int rc = -EACCES;
2330         struct smb2_read_plain_req *req = NULL;
2331         struct smb2_sync_hdr *shdr;
2332
2333         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
2334                                  total_len);
2335         if (rc)
2336                 return rc;
2337         if (io_parms->tcon->ses->server == NULL)
2338                 return -ECONNABORTED;
2339
2340         shdr = &req->sync_hdr;
2341         shdr->ProcessId = cpu_to_le32(io_parms->pid);
2342
2343         req->PersistentFileId = io_parms->persistent_fid;
2344         req->VolatileFileId = io_parms->volatile_fid;
2345         req->ReadChannelInfoOffset = 0; /* reserved */
2346         req->ReadChannelInfoLength = 0; /* reserved */
2347         req->Channel = 0; /* reserved */
2348         req->MinimumCount = 0;
2349         req->Length = cpu_to_le32(io_parms->length);
2350         req->Offset = cpu_to_le64(io_parms->offset);
2351
2352         if (request_type & CHAINED_REQUEST) {
2353                 if (!(request_type & END_OF_CHAIN)) {
2354                         /* next 8-byte aligned request */
2355                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
2356                         shdr->NextCommand = cpu_to_le32(*total_len);
2357                 } else /* END_OF_CHAIN */
2358                         shdr->NextCommand = 0;
2359                 if (request_type & RELATED_REQUEST) {
2360                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
2361                         /*
2362                          * Related requests use info from previous read request
2363                          * in chain.
2364                          */
2365                         shdr->SessionId = 0xFFFFFFFF;
2366                         shdr->TreeId = 0xFFFFFFFF;
2367                         req->PersistentFileId = 0xFFFFFFFF;
2368                         req->VolatileFileId = 0xFFFFFFFF;
2369                 }
2370         }
2371         if (remaining_bytes > io_parms->length)
2372                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
2373         else
2374                 req->RemainingBytes = 0;
2375
2376         *buf = req;
2377         return rc;
2378 }
2379
2380 static void
2381 smb2_readv_callback(struct mid_q_entry *mid)
2382 {
2383         struct cifs_readdata *rdata = mid->callback_data;
2384         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
2385         struct TCP_Server_Info *server = tcon->ses->server;
2386         struct smb2_sync_hdr *shdr =
2387                                 (struct smb2_sync_hdr *)rdata->iov[1].iov_base;
2388         unsigned int credits_received = 1;
2389         struct smb_rqst rqst = { .rq_iov = rdata->iov,
2390                                  .rq_nvec = 2,
2391                                  .rq_pages = rdata->pages,
2392                                  .rq_npages = rdata->nr_pages,
2393                                  .rq_pagesz = rdata->pagesz,
2394                                  .rq_tailsz = rdata->tailsz };
2395
2396         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
2397                  __func__, mid->mid, mid->mid_state, rdata->result,
2398                  rdata->bytes);
2399
2400         switch (mid->mid_state) {
2401         case MID_RESPONSE_RECEIVED:
2402                 credits_received = le16_to_cpu(shdr->CreditRequest);
2403                 /* result already set, check signature */
2404                 if (server->sign && !mid->decrypted) {
2405                         int rc;
2406
2407                         rc = smb2_verify_signature(&rqst, server);
2408                         if (rc)
2409                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
2410                                          rc);
2411                 }
2412                 /* FIXME: should this be counted toward the initiating task? */
2413                 task_io_account_read(rdata->got_bytes);
2414                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2415                 break;
2416         case MID_REQUEST_SUBMITTED:
2417         case MID_RETRY_NEEDED:
2418                 rdata->result = -EAGAIN;
2419                 if (server->sign && rdata->got_bytes)
2420                         /* reset bytes number since we can not check a sign */
2421                         rdata->got_bytes = 0;
2422                 /* FIXME: should this be counted toward the initiating task? */
2423                 task_io_account_read(rdata->got_bytes);
2424                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
2425                 break;
2426         default:
2427                 if (rdata->result != -ENODATA)
2428                         rdata->result = -EIO;
2429         }
2430
2431         if (rdata->result)
2432                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
2433
2434         queue_work(cifsiod_wq, &rdata->work);
2435         mutex_lock(&server->srv_mutex);
2436         DeleteMidQEntry(mid);
2437         mutex_unlock(&server->srv_mutex);
2438         add_credits(server, credits_received, 0);
2439 }
2440
2441 /* smb2_async_readv - send an async read, and set up mid to handle result */
2442 int
2443 smb2_async_readv(struct cifs_readdata *rdata)
2444 {
2445         int rc, flags = 0;
2446         char *buf;
2447         struct smb2_sync_hdr *shdr;
2448         struct cifs_io_parms io_parms;
2449         struct smb_rqst rqst = { .rq_iov = rdata->iov,
2450                                  .rq_nvec = 2 };
2451         struct TCP_Server_Info *server;
2452         unsigned int total_len;
2453         __be32 req_len;
2454
2455         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
2456                  __func__, rdata->offset, rdata->bytes);
2457
2458         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
2459         io_parms.offset = rdata->offset;
2460         io_parms.length = rdata->bytes;
2461         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
2462         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
2463         io_parms.pid = rdata->pid;
2464
2465         server = io_parms.tcon->ses->server;
2466
2467         rc = smb2_new_read_req((void **) &buf, &total_len, &io_parms, 0, 0);
2468         if (rc) {
2469                 if (rc == -EAGAIN && rdata->credits) {
2470                         /* credits was reset by reconnect */
2471                         rdata->credits = 0;
2472                         /* reduce in_flight value since we won't send the req */
2473                         spin_lock(&server->req_lock);
2474                         server->in_flight--;
2475                         spin_unlock(&server->req_lock);
2476                 }
2477                 return rc;
2478         }
2479
2480         if (encryption_required(io_parms.tcon))
2481                 flags |= CIFS_TRANSFORM_REQ;
2482
2483         req_len = cpu_to_be32(total_len);
2484
2485         rdata->iov[0].iov_base = &req_len;
2486         rdata->iov[0].iov_len = sizeof(__be32);
2487         rdata->iov[1].iov_base = buf;
2488         rdata->iov[1].iov_len = total_len;
2489
2490         shdr = (struct smb2_sync_hdr *)buf;
2491
2492         if (rdata->credits) {
2493                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
2494                                                 SMB2_MAX_BUFFER_SIZE));
2495                 shdr->CreditRequest = shdr->CreditCharge;
2496                 spin_lock(&server->req_lock);
2497                 server->credits += rdata->credits -
2498                                                 le16_to_cpu(shdr->CreditCharge);
2499                 spin_unlock(&server->req_lock);
2500                 wake_up(&server->request_q);
2501                 flags |= CIFS_HAS_CREDITS;
2502         }
2503
2504         kref_get(&rdata->refcount);
2505         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
2506                              cifs_readv_receive, smb2_readv_callback,
2507                              smb3_handle_read_data, rdata, flags);
2508         if (rc) {
2509                 kref_put(&rdata->refcount, cifs_readdata_release);
2510                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
2511         }
2512
2513         cifs_small_buf_release(buf);
2514         return rc;
2515 }
2516
2517 int
2518 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
2519           unsigned int *nbytes, char **buf, int *buf_type)
2520 {
2521         int resp_buftype, rc = -EACCES;
2522         struct smb2_read_plain_req *req = NULL;
2523         struct smb2_read_rsp *rsp = NULL;
2524         struct smb2_sync_hdr *shdr;
2525         struct kvec iov[2];
2526         struct kvec rsp_iov;
2527         unsigned int total_len;
2528         __be32 req_len;
2529         struct smb_rqst rqst = { .rq_iov = iov,
2530                                  .rq_nvec = 2 };
2531         int flags = CIFS_LOG_ERROR;
2532         struct cifs_ses *ses = io_parms->tcon->ses;
2533
2534         *nbytes = 0;
2535         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, 0, 0);
2536         if (rc)
2537                 return rc;
2538
2539         if (encryption_required(io_parms->tcon))
2540                 flags |= CIFS_TRANSFORM_REQ;
2541
2542         req_len = cpu_to_be32(total_len);
2543
2544         iov[0].iov_base = &req_len;
2545         iov[0].iov_len = sizeof(__be32);
2546         iov[1].iov_base = req;
2547         iov[1].iov_len = total_len;
2548
2549         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2550         cifs_small_buf_release(req);
2551
2552         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
2553         shdr = get_sync_hdr(rsp);
2554
2555         if (shdr->Status == STATUS_END_OF_FILE) {
2556                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2557                 return 0;
2558         }
2559
2560         if (rc) {
2561                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
2562                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
2563         } else {
2564                 *nbytes = le32_to_cpu(rsp->DataLength);
2565                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
2566                     (*nbytes > io_parms->length)) {
2567                         cifs_dbg(FYI, "bad length %d for count %d\n",
2568                                  *nbytes, io_parms->length);
2569                         rc = -EIO;
2570                         *nbytes = 0;
2571                 }
2572         }
2573
2574         if (*buf) {
2575                 memcpy(*buf, (char *)shdr + rsp->DataOffset, *nbytes);
2576                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
2577         } else if (resp_buftype != CIFS_NO_BUFFER) {
2578                 *buf = rsp_iov.iov_base;
2579                 if (resp_buftype == CIFS_SMALL_BUFFER)
2580                         *buf_type = CIFS_SMALL_BUFFER;
2581                 else if (resp_buftype == CIFS_LARGE_BUFFER)
2582                         *buf_type = CIFS_LARGE_BUFFER;
2583         }
2584         return rc;
2585 }
2586
2587 /*
2588  * Check the mid_state and signature on received buffer (if any), and queue the
2589  * workqueue completion task.
2590  */
2591 static void
2592 smb2_writev_callback(struct mid_q_entry *mid)
2593 {
2594         struct cifs_writedata *wdata = mid->callback_data;
2595         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2596         struct TCP_Server_Info *server = tcon->ses->server;
2597         unsigned int written;
2598         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
2599         unsigned int credits_received = 1;
2600
2601         switch (mid->mid_state) {
2602         case MID_RESPONSE_RECEIVED:
2603                 credits_received = le16_to_cpu(rsp->hdr.sync_hdr.CreditRequest);
2604                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
2605                 if (wdata->result != 0)
2606                         break;
2607
2608                 written = le32_to_cpu(rsp->DataLength);
2609                 /*
2610                  * Mask off high 16 bits when bytes written as returned
2611                  * by the server is greater than bytes requested by the
2612                  * client. OS/2 servers are known to set incorrect
2613                  * CountHigh values.
2614                  */
2615                 if (written > wdata->bytes)
2616                         written &= 0xFFFF;
2617
2618                 if (written < wdata->bytes)
2619                         wdata->result = -ENOSPC;
2620                 else
2621                         wdata->bytes = written;
2622                 break;
2623         case MID_REQUEST_SUBMITTED:
2624         case MID_RETRY_NEEDED:
2625                 wdata->result = -EAGAIN;
2626                 break;
2627         default:
2628                 wdata->result = -EIO;
2629                 break;
2630         }
2631
2632         if (wdata->result)
2633                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2634
2635         queue_work(cifsiod_wq, &wdata->work);
2636         mutex_lock(&server->srv_mutex);
2637         DeleteMidQEntry(mid);
2638         mutex_unlock(&server->srv_mutex);
2639         add_credits(tcon->ses->server, credits_received, 0);
2640 }
2641
2642 /* smb2_async_writev - send an async write, and set up mid to handle result */
2643 int
2644 smb2_async_writev(struct cifs_writedata *wdata,
2645                   void (*release)(struct kref *kref))
2646 {
2647         int rc = -EACCES, flags = 0;
2648         struct smb2_write_req *req = NULL;
2649         struct smb2_sync_hdr *shdr;
2650         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2651         struct TCP_Server_Info *server = tcon->ses->server;
2652         struct kvec iov[2];
2653         struct smb_rqst rqst = { };
2654
2655         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
2656         if (rc) {
2657                 if (rc == -EAGAIN && wdata->credits) {
2658                         /* credits was reset by reconnect */
2659                         wdata->credits = 0;
2660                         /* reduce in_flight value since we won't send the req */
2661                         spin_lock(&server->req_lock);
2662                         server->in_flight--;
2663                         spin_unlock(&server->req_lock);
2664                 }
2665                 goto async_writev_out;
2666         }
2667
2668         if (encryption_required(tcon))
2669                 flags |= CIFS_TRANSFORM_REQ;
2670
2671         shdr = get_sync_hdr(req);
2672         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
2673
2674         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
2675         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
2676         req->WriteChannelInfoOffset = 0;
2677         req->WriteChannelInfoLength = 0;
2678         req->Channel = 0;
2679         req->Offset = cpu_to_le64(wdata->offset);
2680         /* 4 for rfc1002 length field */
2681         req->DataOffset = cpu_to_le16(
2682                                 offsetof(struct smb2_write_req, Buffer) - 4);
2683         req->RemainingBytes = 0;
2684
2685         /* 4 for rfc1002 length field and 1 for Buffer */
2686         iov[0].iov_len = 4;
2687         iov[0].iov_base = req;
2688         iov[1].iov_len = get_rfc1002_length(req) - 1;
2689         iov[1].iov_base = (char *)req + 4;
2690
2691         rqst.rq_iov = iov;
2692         rqst.rq_nvec = 2;
2693         rqst.rq_pages = wdata->pages;
2694         rqst.rq_npages = wdata->nr_pages;
2695         rqst.rq_pagesz = wdata->pagesz;
2696         rqst.rq_tailsz = wdata->tailsz;
2697
2698         cifs_dbg(FYI, "async write at %llu %u bytes\n",
2699                  wdata->offset, wdata->bytes);
2700
2701         req->Length = cpu_to_le32(wdata->bytes);
2702
2703         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
2704
2705         if (wdata->credits) {
2706                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2707                                                     SMB2_MAX_BUFFER_SIZE));
2708                 shdr->CreditRequest = shdr->CreditCharge;
2709                 spin_lock(&server->req_lock);
2710                 server->credits += wdata->credits -
2711                                                 le16_to_cpu(shdr->CreditCharge);
2712                 spin_unlock(&server->req_lock);
2713                 wake_up(&server->request_q);
2714                 flags |= CIFS_HAS_CREDITS;
2715         }
2716
2717         kref_get(&wdata->refcount);
2718         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
2719                              wdata, flags);
2720
2721         if (rc) {
2722                 kref_put(&wdata->refcount, release);
2723                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2724         }
2725
2726 async_writev_out:
2727         cifs_small_buf_release(req);
2728         return rc;
2729 }
2730
2731 /*
2732  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
2733  * The length field from io_parms must be at least 1 and indicates a number of
2734  * elements with data to write that begins with position 1 in iov array. All
2735  * data length is specified by count.
2736  */
2737 int
2738 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
2739            unsigned int *nbytes, struct kvec *iov, int n_vec)
2740 {
2741         int rc = 0;
2742         struct smb2_write_req *req = NULL;
2743         struct smb2_write_rsp *rsp = NULL;
2744         int resp_buftype;
2745         struct kvec rsp_iov;
2746         int flags = 0;
2747
2748         *nbytes = 0;
2749
2750         if (n_vec < 1)
2751                 return rc;
2752
2753         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
2754         if (rc)
2755                 return rc;
2756
2757         if (io_parms->tcon->ses->server == NULL)
2758                 return -ECONNABORTED;
2759
2760         if (encryption_required(io_parms->tcon))
2761                 flags |= CIFS_TRANSFORM_REQ;
2762
2763         req->hdr.sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
2764
2765         req->PersistentFileId = io_parms->persistent_fid;
2766         req->VolatileFileId = io_parms->volatile_fid;
2767         req->WriteChannelInfoOffset = 0;
2768         req->WriteChannelInfoLength = 0;
2769         req->Channel = 0;
2770         req->Length = cpu_to_le32(io_parms->length);
2771         req->Offset = cpu_to_le64(io_parms->offset);
2772         /* 4 for rfc1002 length field */
2773         req->DataOffset = cpu_to_le16(
2774                                 offsetof(struct smb2_write_req, Buffer) - 4);
2775         req->RemainingBytes = 0;
2776
2777         iov[0].iov_base = (char *)req;
2778         /* 4 for rfc1002 length field and 1 for Buffer */
2779         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2780
2781         /* length of entire message including data to be written */
2782         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2783
2784         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2785                           &resp_buftype, flags, &rsp_iov);
2786         cifs_small_buf_release(req);
2787         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
2788
2789         if (rc) {
2790                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2791                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2792         } else
2793                 *nbytes = le32_to_cpu(rsp->DataLength);
2794
2795         free_rsp_buf(resp_buftype, rsp);
2796         return rc;
2797 }
2798
2799 static unsigned int
2800 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2801 {
2802         int len;
2803         unsigned int entrycount = 0;
2804         unsigned int next_offset = 0;
2805         FILE_DIRECTORY_INFO *entryptr;
2806
2807         if (bufstart == NULL)
2808                 return 0;
2809
2810         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2811
2812         while (1) {
2813                 entryptr = (FILE_DIRECTORY_INFO *)
2814                                         ((char *)entryptr + next_offset);
2815
2816                 if ((char *)entryptr + size > end_of_buf) {
2817                         cifs_dbg(VFS, "malformed search entry would overflow\n");
2818                         break;
2819                 }
2820
2821                 len = le32_to_cpu(entryptr->FileNameLength);
2822                 if ((char *)entryptr + len + size > end_of_buf) {
2823                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2824                                  end_of_buf);
2825                         break;
2826                 }
2827
2828                 *lastentry = (char *)entryptr;
2829                 entrycount++;
2830
2831                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2832                 if (!next_offset)
2833                         break;
2834         }
2835
2836         return entrycount;
2837 }
2838
2839 /*
2840  * Readdir/FindFirst
2841  */
2842 int
2843 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2844                      u64 persistent_fid, u64 volatile_fid, int index,
2845                      struct cifs_search_info *srch_inf)
2846 {
2847         struct smb2_query_directory_req *req;
2848         struct smb2_query_directory_rsp *rsp = NULL;
2849         struct kvec iov[2];
2850         struct kvec rsp_iov;
2851         int rc = 0;
2852         int len;
2853         int resp_buftype = CIFS_NO_BUFFER;
2854         unsigned char *bufptr;
2855         struct TCP_Server_Info *server;
2856         struct cifs_ses *ses = tcon->ses;
2857         __le16 asteriks = cpu_to_le16('*');
2858         char *end_of_smb;
2859         unsigned int output_size = CIFSMaxBufSize;
2860         size_t info_buf_size;
2861         int flags = 0;
2862
2863         if (ses && (ses->server))
2864                 server = ses->server;
2865         else
2866                 return -EIO;
2867
2868         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2869         if (rc)
2870                 return rc;
2871
2872         if (encryption_required(tcon))
2873                 flags |= CIFS_TRANSFORM_REQ;
2874
2875         switch (srch_inf->info_level) {
2876         case SMB_FIND_FILE_DIRECTORY_INFO:
2877                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2878                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2879                 break;
2880         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2881                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2882                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2883                 break;
2884         default:
2885                 cifs_dbg(VFS, "info level %u isn't supported\n",
2886                          srch_inf->info_level);
2887                 rc = -EINVAL;
2888                 goto qdir_exit;
2889         }
2890
2891         req->FileIndex = cpu_to_le32(index);
2892         req->PersistentFileId = persistent_fid;
2893         req->VolatileFileId = volatile_fid;
2894
2895         len = 0x2;
2896         bufptr = req->Buffer;
2897         memcpy(bufptr, &asteriks, len);
2898
2899         req->FileNameOffset =
2900                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2901         req->FileNameLength = cpu_to_le16(len);
2902         /*
2903          * BB could be 30 bytes or so longer if we used SMB2 specific
2904          * buffer lengths, but this is safe and close enough.
2905          */
2906         output_size = min_t(unsigned int, output_size, server->maxBuf);
2907         output_size = min_t(unsigned int, output_size, 2 << 15);
2908         req->OutputBufferLength = cpu_to_le32(output_size);
2909
2910         iov[0].iov_base = (char *)req;
2911         /* 4 for RFC1001 length and 1 for Buffer */
2912         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2913
2914         iov[1].iov_base = (char *)(req->Buffer);
2915         iov[1].iov_len = len;
2916
2917         inc_rfc1001_len(req, len - 1 /* Buffer */);
2918
2919         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, flags, &rsp_iov);
2920         cifs_small_buf_release(req);
2921         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
2922
2923         if (rc) {
2924                 if (rc == -ENODATA &&
2925                     rsp->hdr.sync_hdr.Status == STATUS_NO_MORE_FILES) {
2926                         srch_inf->endOfSearch = true;
2927                         rc = 0;
2928                 }
2929                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2930                 goto qdir_exit;
2931         }
2932
2933         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2934                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2935                           info_buf_size);
2936         if (rc)
2937                 goto qdir_exit;
2938
2939         srch_inf->unicode = true;
2940
2941         if (srch_inf->ntwrk_buf_start) {
2942                 if (srch_inf->smallBuf)
2943                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2944                 else
2945                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2946         }
2947         srch_inf->ntwrk_buf_start = (char *)rsp;
2948         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2949                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2950         /* 4 for rfc1002 length field */
2951         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2952         srch_inf->entries_in_buffer =
2953                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2954                                     &srch_inf->last_entry, info_buf_size);
2955         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2956         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2957                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2958                  srch_inf->srch_entries_start, srch_inf->last_entry);
2959         if (resp_buftype == CIFS_LARGE_BUFFER)
2960                 srch_inf->smallBuf = false;
2961         else if (resp_buftype == CIFS_SMALL_BUFFER)
2962                 srch_inf->smallBuf = true;
2963         else
2964                 cifs_dbg(VFS, "illegal search buffer type\n");
2965
2966         return rc;
2967
2968 qdir_exit:
2969         free_rsp_buf(resp_buftype, rsp);
2970         return rc;
2971 }
2972
2973 static int
2974 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2975                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2976                unsigned int num, void **data, unsigned int *size)
2977 {
2978         struct smb2_set_info_req *req;
2979         struct smb2_set_info_rsp *rsp = NULL;
2980         struct kvec *iov;
2981         struct kvec rsp_iov;
2982         int rc = 0;
2983         int resp_buftype;
2984         unsigned int i;
2985         struct TCP_Server_Info *server;
2986         struct cifs_ses *ses = tcon->ses;
2987         int flags = 0;
2988
2989         if (ses && (ses->server))
2990                 server = ses->server;
2991         else
2992                 return -EIO;
2993
2994         if (!num)
2995                 return -EINVAL;
2996
2997         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2998         if (!iov)
2999                 return -ENOMEM;
3000
3001         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
3002         if (rc) {
3003                 kfree(iov);
3004                 return rc;
3005         }
3006
3007         if (encryption_required(tcon))
3008                 flags |= CIFS_TRANSFORM_REQ;
3009
3010         req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
3011
3012         req->InfoType = SMB2_O_INFO_FILE;
3013         req->FileInfoClass = info_class;
3014         req->PersistentFileId = persistent_fid;
3015         req->VolatileFileId = volatile_fid;
3016
3017         /* 4 for RFC1001 length and 1 for Buffer */
3018         req->BufferOffset =
3019                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
3020         req->BufferLength = cpu_to_le32(*size);
3021
3022         inc_rfc1001_len(req, *size - 1 /* Buffer */);
3023
3024         memcpy(req->Buffer, *data, *size);
3025
3026         iov[0].iov_base = (char *)req;
3027         /* 4 for RFC1001 length */
3028         iov[0].iov_len = get_rfc1002_length(req) + 4;
3029
3030         for (i = 1; i < num; i++) {
3031                 inc_rfc1001_len(req, size[i]);
3032                 le32_add_cpu(&req->BufferLength, size[i]);
3033                 iov[i].iov_base = (char *)data[i];
3034                 iov[i].iov_len = size[i];
3035         }
3036
3037         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, flags, &rsp_iov);
3038         cifs_small_buf_release(req);
3039         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3040
3041         if (rc != 0)
3042                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3043
3044         free_rsp_buf(resp_buftype, rsp);
3045         kfree(iov);
3046         return rc;
3047 }
3048
3049 int
3050 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
3051             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3052 {
3053         struct smb2_file_rename_info info;
3054         void **data;
3055         unsigned int size[2];
3056         int rc;
3057         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3058
3059         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3060         if (!data)
3061                 return -ENOMEM;
3062
3063         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
3064                               /* 0 = fail if target already exists */
3065         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3066         info.FileNameLength = cpu_to_le32(len);
3067
3068         data[0] = &info;
3069         size[0] = sizeof(struct smb2_file_rename_info);
3070
3071         data[1] = target_file;
3072         size[1] = len + 2 /* null */;
3073
3074         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3075                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
3076                            size);
3077         kfree(data);
3078         return rc;
3079 }
3080
3081 int
3082 SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
3083                   u64 persistent_fid, u64 volatile_fid)
3084 {
3085         __u8 delete_pending = 1;
3086         void *data;
3087         unsigned int size;
3088
3089         data = &delete_pending;
3090         size = 1; /* sizeof __u8 */
3091
3092         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3093                         current->tgid, FILE_DISPOSITION_INFORMATION, 1, &data,
3094                         &size);
3095 }
3096
3097 int
3098 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
3099                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3100 {
3101         struct smb2_file_link_info info;
3102         void **data;
3103         unsigned int size[2];
3104         int rc;
3105         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3106
3107         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
3108         if (!data)
3109                 return -ENOMEM;
3110
3111         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
3112                               /* 0 = fail if link already exists */
3113         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3114         info.FileNameLength = cpu_to_le32(len);
3115
3116         data[0] = &info;
3117         size[0] = sizeof(struct smb2_file_link_info);
3118
3119         data[1] = target_file;
3120         size[1] = len + 2 /* null */;
3121
3122         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3123                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
3124         kfree(data);
3125         return rc;
3126 }
3127
3128 int
3129 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3130              u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
3131 {
3132         struct smb2_file_eof_info info;
3133         void *data;
3134         unsigned int size;
3135
3136         info.EndOfFile = *eof;
3137
3138         data = &info;
3139         size = sizeof(struct smb2_file_eof_info);
3140
3141         if (is_falloc)
3142                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3143                         pid, FILE_ALLOCATION_INFORMATION, 1, &data, &size);
3144         else
3145                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3146                         pid, FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
3147 }
3148
3149 int
3150 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3151               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
3152 {
3153         unsigned int size;
3154         size = sizeof(FILE_BASIC_INFO);
3155         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3156                              current->tgid, FILE_BASIC_INFORMATION, 1,
3157                              (void **)&buf, &size);
3158 }
3159
3160 int
3161 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
3162                   const u64 persistent_fid, const u64 volatile_fid,
3163                   __u8 oplock_level)
3164 {
3165         int rc;
3166         struct smb2_oplock_break *req = NULL;
3167         int flags = CIFS_OBREAK_OP;
3168
3169         cifs_dbg(FYI, "SMB2_oplock_break\n");
3170         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
3171         if (rc)
3172                 return rc;
3173
3174         if (encryption_required(tcon))
3175                 flags |= CIFS_TRANSFORM_REQ;
3176
3177         req->VolatileFid = volatile_fid;
3178         req->PersistentFid = persistent_fid;
3179         req->OplockLevel = oplock_level;
3180         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
3181
3182         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
3183         cifs_small_buf_release(req);
3184
3185         if (rc) {
3186                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3187                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
3188         }
3189
3190         return rc;
3191 }
3192
3193 static void
3194 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
3195                         struct kstatfs *kst)
3196 {
3197         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
3198                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
3199         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
3200         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
3201         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
3202         return;
3203 }
3204
3205 static int
3206 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
3207                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
3208 {
3209         int rc;
3210         struct smb2_query_info_req *req;
3211
3212         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
3213
3214         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
3215                 return -EIO;
3216
3217         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
3218         if (rc)
3219                 return rc;
3220
3221         req->InfoType = SMB2_O_INFO_FILESYSTEM;
3222         req->FileInfoClass = level;
3223         req->PersistentFileId = persistent_fid;
3224         req->VolatileFileId = volatile_fid;
3225         /* 4 for rfc1002 length field and 1 for pad */
3226         req->InputBufferOffset =
3227                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
3228         req->OutputBufferLength = cpu_to_le32(
3229                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
3230
3231         iov->iov_base = (char *)req;
3232         /* 4 for rfc1002 length field */
3233         iov->iov_len = get_rfc1002_length(req) + 4;
3234         return 0;
3235 }
3236
3237 int
3238 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
3239               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
3240 {
3241         struct smb2_query_info_rsp *rsp = NULL;
3242         struct kvec iov;
3243         struct kvec rsp_iov;
3244         int rc = 0;
3245         int resp_buftype;
3246         struct cifs_ses *ses = tcon->ses;
3247         struct smb2_fs_full_size_info *info = NULL;
3248         int flags = 0;
3249
3250         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
3251                                 sizeof(struct smb2_fs_full_size_info),
3252                                 persistent_fid, volatile_fid);
3253         if (rc)
3254                 return rc;
3255
3256         if (encryption_required(tcon))
3257                 flags |= CIFS_TRANSFORM_REQ;
3258
3259         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3260         cifs_small_buf_release(iov.iov_base);
3261         if (rc) {
3262                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3263                 goto qfsinf_exit;
3264         }
3265         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3266
3267         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
3268                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
3269         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
3270                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
3271                           sizeof(struct smb2_fs_full_size_info));
3272         if (!rc)
3273                 copy_fs_info_to_kstatfs(info, fsdata);
3274
3275 qfsinf_exit:
3276         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3277         return rc;
3278 }
3279
3280 int
3281 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
3282               u64 persistent_fid, u64 volatile_fid, int level)
3283 {
3284         struct smb2_query_info_rsp *rsp = NULL;
3285         struct kvec iov;
3286         struct kvec rsp_iov;
3287         int rc = 0;
3288         int resp_buftype, max_len, min_len;
3289         struct cifs_ses *ses = tcon->ses;
3290         unsigned int rsp_len, offset;
3291         int flags = 0;
3292
3293         if (level == FS_DEVICE_INFORMATION) {
3294                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3295                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
3296         } else if (level == FS_ATTRIBUTE_INFORMATION) {
3297                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
3298                 min_len = MIN_FS_ATTR_INFO_SIZE;
3299         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
3300                 max_len = sizeof(struct smb3_fs_ss_info);
3301                 min_len = sizeof(struct smb3_fs_ss_info);
3302         } else {
3303                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
3304                 return -EINVAL;
3305         }
3306
3307         rc = build_qfs_info_req(&iov, tcon, level, max_len,
3308                                 persistent_fid, volatile_fid);
3309         if (rc)
3310                 return rc;
3311
3312         if (encryption_required(tcon))
3313                 flags |= CIFS_TRANSFORM_REQ;
3314
3315         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, flags, &rsp_iov);
3316         cifs_small_buf_release(iov.iov_base);
3317         if (rc) {
3318                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3319                 goto qfsattr_exit;
3320         }
3321         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3322
3323         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
3324         offset = le16_to_cpu(rsp->OutputBufferOffset);
3325         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
3326         if (rc)
3327                 goto qfsattr_exit;
3328
3329         if (level == FS_ATTRIBUTE_INFORMATION)
3330                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
3331                         + (char *)&rsp->hdr, min_t(unsigned int,
3332                         rsp_len, max_len));
3333         else if (level == FS_DEVICE_INFORMATION)
3334                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
3335                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
3336         else if (level == FS_SECTOR_SIZE_INFORMATION) {
3337                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
3338                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
3339                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
3340                 tcon->perf_sector_size =
3341                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
3342         }
3343
3344 qfsattr_exit:
3345         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3346         return rc;
3347 }
3348
3349 int
3350 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
3351            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3352            const __u32 num_lock, struct smb2_lock_element *buf)
3353 {
3354         int rc = 0;
3355         struct smb2_lock_req *req = NULL;
3356         struct kvec iov[2];
3357         struct kvec rsp_iov;
3358         int resp_buf_type;
3359         unsigned int count;
3360         int flags = CIFS_NO_RESP;
3361
3362         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
3363
3364         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
3365         if (rc)
3366                 return rc;
3367
3368         if (encryption_required(tcon))
3369                 flags |= CIFS_TRANSFORM_REQ;
3370
3371         req->hdr.sync_hdr.ProcessId = cpu_to_le32(pid);
3372         req->LockCount = cpu_to_le16(num_lock);
3373
3374         req->PersistentFileId = persist_fid;
3375         req->VolatileFileId = volatile_fid;
3376
3377         count = num_lock * sizeof(struct smb2_lock_element);
3378         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
3379
3380         iov[0].iov_base = (char *)req;
3381         /* 4 for rfc1002 length field and count for all locks */
3382         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
3383         iov[1].iov_base = (char *)buf;
3384         iov[1].iov_len = count;
3385
3386         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
3387         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, flags,
3388                           &rsp_iov);
3389         cifs_small_buf_release(req);
3390         if (rc) {
3391                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
3392                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
3393         }
3394
3395         return rc;
3396 }
3397
3398 int
3399 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
3400           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
3401           const __u64 length, const __u64 offset, const __u32 lock_flags,
3402           const bool wait)
3403 {
3404         struct smb2_lock_element lock;
3405
3406         lock.Offset = cpu_to_le64(offset);
3407         lock.Length = cpu_to_le64(length);
3408         lock.Flags = cpu_to_le32(lock_flags);
3409         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
3410                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
3411
3412         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
3413 }
3414
3415 int
3416 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
3417                  __u8 *lease_key, const __le32 lease_state)
3418 {
3419         int rc;
3420         struct smb2_lease_ack *req = NULL;
3421         int flags = CIFS_OBREAK_OP;
3422
3423         cifs_dbg(FYI, "SMB2_lease_break\n");
3424         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
3425         if (rc)
3426                 return rc;
3427
3428         if (encryption_required(tcon))
3429                 flags |= CIFS_TRANSFORM_REQ;
3430
3431         req->hdr.sync_hdr.CreditRequest = cpu_to_le16(1);
3432         req->StructureSize = cpu_to_le16(36);
3433         inc_rfc1001_len(req, 12);
3434
3435         memcpy(req->LeaseKey, lease_key, 16);
3436         req->LeaseState = lease_state;
3437
3438         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, flags);
3439         cifs_small_buf_release(req);
3440
3441         if (rc) {
3442                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
3443                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
3444         }
3445
3446         return rc;
3447 }