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
  50 /*
  51  *  The following table defines the expected "StructureSize" of SMB2 requests
  52  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  53  *
  54  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  55  *  indexed by command in host byte order.
  56  */
  57 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  58         /* SMB2_NEGOTIATE */ 36,
  59         /* SMB2_SESSION_SETUP */ 25,
  60         /* SMB2_LOGOFF */ 4,
  61         /* SMB2_TREE_CONNECT */ 9,
  62         /* SMB2_TREE_DISCONNECT */ 4,
  63         /* SMB2_CREATE */ 57,
  64         /* SMB2_CLOSE */ 24,
  65         /* SMB2_FLUSH */ 24,
  66         /* SMB2_READ */ 49,
  67         /* SMB2_WRITE */ 49,
  68         /* SMB2_LOCK */ 48,
  69         /* SMB2_IOCTL */ 57,
  70         /* SMB2_CANCEL */ 4,
  71         /* SMB2_ECHO */ 4,
  72         /* SMB2_QUERY_DIRECTORY */ 33,
  73         /* SMB2_CHANGE_NOTIFY */ 32,
  74         /* SMB2_QUERY_INFO */ 41,
  75         /* SMB2_SET_INFO */ 33,
  76         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  77 };
  78
  79
  80 static void
  81 smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
  82                   const struct cifs_tcon *tcon)
  83 {
  84         struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
  85         char *temp = (char *)hdr;
  86         /* lookup word count ie StructureSize from table */
  87         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
  88
  89         /*
  90          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
  91          * largest operations (Create)
  92          */
  93         memset(temp, 0, 256);
  94
  95         /* Note this is only network field converted to big endian */
  96         hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
  97                         - 4 /*  RFC 1001 length field itself not counted */);
  98
  99         hdr->ProtocolId[0] = 0xFE;
 100         hdr->ProtocolId[1] = 'S';
 101         hdr->ProtocolId[2] = 'M';
 102         hdr->ProtocolId[3] = 'B';
 103         hdr->StructureSize = cpu_to_le16(64);
 104         hdr->Command = smb2_cmd;
 105         hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
 106         hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 107
 108         if (!tcon)
 109                 goto out;
 110
 111         /* BB FIXME when we do write > 64K add +1 for every 64K in req or rsp */
 112         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 113         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 114         if ((tcon->ses) &&
 115             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 116                 hdr->CreditCharge = cpu_to_le16(1);
 117         /* else CreditCharge MBZ */
 118
 119         hdr->TreeId = tcon->tid;
 120         /* Uid is not converted */
 121         if (tcon->ses)
 122                 hdr->SessionId = tcon->ses->Suid;
 123
 124         /*
 125          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 126          * to pass the path on the Open SMB prefixed by \\server\share.
 127          * Not sure when we would need to do the augmented path (if ever) and
 128          * setting this flag breaks the SMB2 open operation since it is
 129          * illegal to send an empty path name (without \\server\share prefix)
 130          * when the DFS flag is set in the SMB open header. We could
 131          * consider setting the flag on all operations other than open
 132          * but it is safer to net set it for now.
 133          */
 134 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 135                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 136
 137         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
 138                 hdr->Flags |= SMB2_FLAGS_SIGNED;
 139 out:
 140         pdu->StructureSize2 = cpu_to_le16(parmsize);
 141         return;
 142 }
 143
 144 static int
 145 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 146 {
 147         int rc = 0;
 148         struct nls_table *nls_codepage;
 149         struct cifs_ses *ses;
 150         struct TCP_Server_Info *server;
 151
 152         /*
 153          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 154          * check for tcp and smb session status done differently
 155          * for those three - in the calling routine.
 156          */
 157         if (tcon == NULL)
 158                 return rc;
 159
 160         if (smb2_command == SMB2_TREE_CONNECT)
 161                 return rc;
 162
 163         if (tcon->tidStatus == CifsExiting) {
 164                 /*
 165                  * only tree disconnect, open, and write,
 166                  * (and ulogoff which does not have tcon)
 167                  * are allowed as we start force umount.
 168                  */
 169                 if ((smb2_command != SMB2_WRITE) &&
 170                    (smb2_command != SMB2_CREATE) &&
 171                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 172                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 173                                  smb2_command);
 174                         return -ENODEV;
 175                 }
 176         }
 177         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 178             (!tcon->ses->server))
 179                 return -EIO;
 180
 181         ses = tcon->ses;
 182         server = ses->server;
 183
 184         /*
 185          * Give demultiplex thread up to 10 seconds to reconnect, should be
 186          * greater than cifs socket timeout which is 7 seconds
 187          */
 188         while (server->tcpStatus == CifsNeedReconnect) {
 189                 /*
 190                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 191                  * here since they are implicitly done when session drops.
 192                  */
 193                 switch (smb2_command) {
 194                 /*
 195                  * BB Should we keep oplock break and add flush to exceptions?
 196                  */
 197                 case SMB2_TREE_DISCONNECT:
 198                 case SMB2_CANCEL:
 199                 case SMB2_CLOSE:
 200                 case SMB2_OPLOCK_BREAK:
 201                         return -EAGAIN;
 202                 }
 203
 204                 wait_event_interruptible_timeout(server->response_q,
 205                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 206
 207                 /* are we still trying to reconnect? */
 208                 if (server->tcpStatus != CifsNeedReconnect)
 209                         break;
 210
 211                 /*
 212                  * on "soft" mounts we wait once. Hard mounts keep
 213                  * retrying until process is killed or server comes
 214                  * back on-line
 215                  */
 216                 if (!tcon->retry) {
 217                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 218                         return -EHOSTDOWN;
 219                 }
 220         }
 221
 222         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 223                 return rc;
 224
 225         nls_codepage = load_nls_default();
 226
 227         /*
 228          * need to prevent multiple threads trying to simultaneously reconnect
 229          * the same SMB session
 230          */
 231         mutex_lock(&tcon->ses->session_mutex);
 232         rc = cifs_negotiate_protocol(0, tcon->ses);
 233         if (!rc && tcon->ses->need_reconnect)
 234                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 235
 236         if (rc || !tcon->need_reconnect) {
 237                 mutex_unlock(&tcon->ses->session_mutex);
 238                 goto out;
 239         }
 240
 241         cifs_mark_open_files_invalid(tcon);
 242         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 243         mutex_unlock(&tcon->ses->session_mutex);
 244         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 245         if (rc)
 246                 goto out;
 247         atomic_inc(&tconInfoReconnectCount);
 248         /*
 249          * BB FIXME add code to check if wsize needs update due to negotiated
 250          * smb buffer size shrinking.
 251          */
 252 out:
 253         /*
 254          * Check if handle based operation so we know whether we can continue
 255          * or not without returning to caller to reset file handle.
 256          */
 257         /*
 258          * BB Is flush done by server on drop of tcp session? Should we special
 259          * case it and skip above?
 260          */
 261         switch (smb2_command) {
 262         case SMB2_FLUSH:
 263         case SMB2_READ:
 264         case SMB2_WRITE:
 265         case SMB2_LOCK:
 266         case SMB2_IOCTL:
 267         case SMB2_QUERY_DIRECTORY:
 268         case SMB2_CHANGE_NOTIFY:
 269         case SMB2_QUERY_INFO:
 270         case SMB2_SET_INFO:
 271                 return -EAGAIN;
 272         }
 273         unload_nls(nls_codepage);
 274         return rc;
 275 }
 276
 277 /*
 278  * Allocate and return pointer to an SMB request hdr, and set basic
 279  * SMB information in the SMB header. If the return code is zero, this
 280  * function must have filled in request_buf pointer.
 281  */
 282 static int
 283 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 284                 void **request_buf)
 285 {
 286         int rc = 0;
 287
 288         rc = smb2_reconnect(smb2_command, tcon);
 289         if (rc)
 290                 return rc;
 291
 292         /* BB eventually switch this to SMB2 specific small buf size */
 293         *request_buf = cifs_small_buf_get();
 294         if (*request_buf == NULL) {
 295                 /* BB should we add a retry in here if not a writepage? */
 296                 return -ENOMEM;
 297         }
 298
 299         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
 300
 301         if (tcon != NULL) {
 302 #ifdef CONFIG_CIFS_STATS2
 303                 uint16_t com_code = le16_to_cpu(smb2_command);
 304                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 305 #endif
 306                 cifs_stats_inc(&tcon->num_smbs_sent);
 307         }
 308
 309         return rc;
 310 }
 311
 312 static void
 313 free_rsp_buf(int resp_buftype, void *rsp)
 314 {
 315         if (resp_buftype == CIFS_SMALL_BUFFER)
 316                 cifs_small_buf_release(rsp);
 317         else if (resp_buftype == CIFS_LARGE_BUFFER)
 318                 cifs_buf_release(rsp);
 319 }
 320
 321
 322 /*
 323  *
 324  *      SMB2 Worker functions follow:
 325  *
 326  *      The general structure of the worker functions is:
 327  *      1) Call smb2_init (assembles SMB2 header)
 328  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 329  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 330  *      4) Decode SMB2 command specific fields in the fixed length area
 331  *      5) Decode variable length data area (if any for this SMB2 command type)
 332  *      6) Call free smb buffer
 333  *      7) return
 334  *
 335  */
 336
 337 int
 338 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 339 {
 340         struct smb2_negotiate_req *req;
 341         struct smb2_negotiate_rsp *rsp;
 342         struct kvec iov[1];
 343         int rc = 0;
 344         int resp_buftype;
 345         struct TCP_Server_Info *server = ses->server;
 346         int blob_offset, blob_length;
 347         char *security_blob;
 348         int flags = CIFS_NEG_OP;
 349
 350         cifs_dbg(FYI, "Negotiate protocol\n");
 351
 352         if (!server) {
 353                 WARN(1, "%s: server is NULL!\n", __func__);
 354                 return -EIO;
 355         }
 356
 357         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 358         if (rc)
 359                 return rc;
 360
 361         req->hdr.SessionId = 0;
 362
 363         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 364
 365         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
 366         inc_rfc1001_len(req, 2);
 367
 368         /* only one of SMB2 signing flags may be set in SMB2 request */
 369         if (ses->sign)
 370                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 371         else if (global_secflags & CIFSSEC_MAY_SIGN)
 372                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 373         else
 374                 req->SecurityMode = 0;
 375
 376         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 377
 378         /* ClientGUID must be zero for SMB2.02 dialect */
 379         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 380                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 381         else
 382                 memcpy(req->ClientGUID, server->client_guid,
 383                         SMB2_CLIENT_GUID_SIZE);
 384
 385         iov[0].iov_base = (char *)req;
 386         /* 4 for rfc1002 length field */
 387         iov[0].iov_len = get_rfc1002_length(req) + 4;
 388
 389         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 390
 391         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 392         /*
 393          * No tcon so can't do
 394          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 395          */
 396         if (rc != 0)
 397                 goto neg_exit;
 398
 399         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 400
 401         /* BB we may eventually want to match the negotiated vs. requested
 402            dialect, even though we are only requesting one at a time */
 403         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 404                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 405         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 406                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 407         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 408                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 409         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 410                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 411         else {
 412                 cifs_dbg(VFS, "Illegal dialect returned by server %d\n",
 413                          le16_to_cpu(rsp->DialectRevision));
 414                 rc = -EIO;
 415                 goto neg_exit;
 416         }
 417         server->dialect = le16_to_cpu(rsp->DialectRevision);
 418
 419         /* SMB2 only has an extended negflavor */
 420         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 421         /* set it to the maximum buffer size value we can send with 1 credit */
 422         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 423                                SMB2_MAX_BUFFER_SIZE);
 424         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 425         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 426         /* BB Do we need to validate the SecurityMode? */
 427         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 428         server->capabilities = le32_to_cpu(rsp->Capabilities);
 429         /* Internal types */
 430         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 431
 432         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 433                                                &rsp->hdr);
 434         /*
 435          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 436          * for us will be
 437          *      ses->sectype = RawNTLMSSP;
 438          * but for time being this is our only auth choice so doesn't matter.
 439          * We just found a server which sets blob length to zero expecting raw.
 440          */
 441         if (blob_length == 0)
 442                 cifs_dbg(FYI, "missing security blob on negprot\n");
 443
 444         rc = cifs_enable_signing(server, ses->sign);
 445 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
 446         if (rc)
 447                 goto neg_exit;
 448         if (blob_length)
 449                 rc = decode_neg_token_init(security_blob, blob_length,
 450                                    &server->sec_type);
 451         if (rc == 1)
 452                 rc = 0;
 453         else if (rc == 0) {
 454                 rc = -EIO;
 455                 goto neg_exit;
 456         }
 457 #endif
 458
 459 neg_exit:
 460         free_rsp_buf(resp_buftype, rsp);
 461         return rc;
 462 }
 463
 464 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 465 {
 466         int rc = 0;
 467         struct validate_negotiate_info_req vneg_inbuf;
 468         struct validate_negotiate_info_rsp *pneg_rsp;
 469         u32 rsplen;
 470
 471         cifs_dbg(FYI, "validate negotiate\n");
 472
 473         /*
 474          * validation ioctl must be signed, so no point sending this if we
 475          * can not sign it.  We could eventually change this to selectively
 476          * sign just this, the first and only signed request on a connection.
 477          * This is good enough for now since a user who wants better security
 478          * would also enable signing on the mount. Having validation of
 479          * negotiate info for signed connections helps reduce attack vectors
 480          */
 481         if (tcon->ses->server->sign == false)
 482                 return 0; /* validation requires signing */
 483
 484         vneg_inbuf.Capabilities =
 485                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 486         memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
 487                                         SMB2_CLIENT_GUID_SIZE);
 488
 489         if (tcon->ses->sign)
 490                 vneg_inbuf.SecurityMode =
 491                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 492         else if (global_secflags & CIFSSEC_MAY_SIGN)
 493                 vneg_inbuf.SecurityMode =
 494                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 495         else
 496                 vneg_inbuf.SecurityMode = 0;
 497
 498         vneg_inbuf.DialectCount = cpu_to_le16(1);
 499         vneg_inbuf.Dialects[0] =
 500                 cpu_to_le16(tcon->ses->server->vals->protocol_id);
 501
 502         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 503                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 504                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
 505                 (char **)&pneg_rsp, &rsplen);
 506
 507         if (rc != 0) {
 508                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 509                 return -EIO;
 510         }
 511
 512         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
 513                 cifs_dbg(VFS, "invalid size of protocol negotiate response\n");
 514                 return -EIO;
 515         }
 516
 517         /* check validate negotiate info response matches what we got earlier */
 518         if (pneg_rsp->Dialect !=
 519                         cpu_to_le16(tcon->ses->server->vals->protocol_id))
 520                 goto vneg_out;
 521
 522         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 523                 goto vneg_out;
 524
 525         /* do not validate server guid because not saved at negprot time yet */
 526
 527         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 528               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 529                 goto vneg_out;
 530
 531         /* validate negotiate successful */
 532         cifs_dbg(FYI, "validate negotiate info successful\n");
 533         return 0;
 534
 535 vneg_out:
 536         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 537         return -EIO;
 538 }
 539
 540 int
 541 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 542                 const struct nls_table *nls_cp)
 543 {
 544         struct smb2_sess_setup_req *req;
 545         struct smb2_sess_setup_rsp *rsp = NULL;
 546         struct kvec iov[2];
 547         int rc = 0;
 548         int resp_buftype;
 549         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 550         struct TCP_Server_Info *server = ses->server;
 551         u16 blob_length = 0;
 552         char *security_blob;
 553         char *ntlmssp_blob = NULL;
 554         bool use_spnego = false; /* else use raw ntlmssp */
 555
 556         cifs_dbg(FYI, "Session Setup\n");
 557
 558         if (!server) {
 559                 WARN(1, "%s: server is NULL!\n", __func__);
 560                 return -EIO;
 561         }
 562
 563         /*
 564          * If we are here due to reconnect, free per-smb session key
 565          * in case signing was required.
 566          */
 567         kfree(ses->auth_key.response);
 568         ses->auth_key.response = NULL;
 569
 570         /*
 571          * If memory allocation is successful, caller of this function
 572          * frees it.
 573          */
 574         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 575         if (!ses->ntlmssp)
 576                 return -ENOMEM;
 577         ses->ntlmssp->sesskey_per_smbsess = true;
 578
 579         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
 580         ses->sectype = RawNTLMSSP;
 581
 582 ssetup_ntlmssp_authenticate:
 583         if (phase == NtLmChallenge)
 584                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 585
 586         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 587         if (rc)
 588                 return rc;
 589
 590         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 591         req->VcNumber = 0; /* MBZ */
 592         /* to enable echos and oplocks */
 593         req->hdr.CreditRequest = cpu_to_le16(3);
 594
 595         /* only one of SMB2 signing flags may be set in SMB2 request */
 596         if (server->sign)
 597                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 598         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 599                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 600         else
 601                 req->SecurityMode = 0;
 602
 603         req->Capabilities = 0;
 604         req->Channel = 0; /* MBZ */
 605
 606         iov[0].iov_base = (char *)req;
 607         /* 4 for rfc1002 length field and 1 for pad */
 608         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 609         if (phase == NtLmNegotiate) {
 610                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 611                                        GFP_KERNEL);
 612                 if (ntlmssp_blob == NULL) {
 613                         rc = -ENOMEM;
 614                         goto ssetup_exit;
 615                 }
 616                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 617                 if (use_spnego) {
 618                         /* blob_length = build_spnego_ntlmssp_blob(
 619                                         &security_blob,
 620                                         sizeof(struct _NEGOTIATE_MESSAGE),
 621                                         ntlmssp_blob); */
 622                         /* BB eventually need to add this */
 623                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 624                         rc = -EOPNOTSUPP;
 625                         kfree(ntlmssp_blob);
 626                         goto ssetup_exit;
 627                 } else {
 628                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 629                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 630                         security_blob = ntlmssp_blob;
 631                 }
 632         } else if (phase == NtLmAuthenticate) {
 633                 req->hdr.SessionId = ses->Suid;
 634                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 635                                        GFP_KERNEL);
 636                 if (ntlmssp_blob == NULL) {
 637                         rc = -ENOMEM;
 638                         goto ssetup_exit;
 639                 }
 640                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 641                                              nls_cp);
 642                 if (rc) {
 643                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
 644                                  rc);
 645                         goto ssetup_exit; /* BB double check error handling */
 646                 }
 647                 if (use_spnego) {
 648                         /* blob_length = build_spnego_ntlmssp_blob(
 649                                                         &security_blob,
 650                                                         blob_length,
 651                                                         ntlmssp_blob); */
 652                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 653                         rc = -EOPNOTSUPP;
 654                         kfree(ntlmssp_blob);
 655                         goto ssetup_exit;
 656                 } else {
 657                         security_blob = ntlmssp_blob;
 658                 }
 659         } else {
 660                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
 661                 rc = -EIO;
 662                 goto ssetup_exit;
 663         }
 664
 665         /* Testing shows that buffer offset must be at location of Buffer[0] */
 666         req->SecurityBufferOffset =
 667                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 668                                             1 /* pad */ - 4 /* rfc1001 len */);
 669         req->SecurityBufferLength = cpu_to_le16(blob_length);
 670         iov[1].iov_base = security_blob;
 671         iov[1].iov_len = blob_length;
 672
 673         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 674
 675         /* BB add code to build os and lm fields */
 676
 677         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 678                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 679
 680         kfree(security_blob);
 681         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 682         if (resp_buftype != CIFS_NO_BUFFER &&
 683             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 684                 if (phase != NtLmNegotiate) {
 685                         cifs_dbg(VFS, "Unexpected more processing error\n");
 686                         goto ssetup_exit;
 687                 }
 688                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 689                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 690                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 691                                  le16_to_cpu(rsp->SecurityBufferOffset));
 692                         rc = -EIO;
 693                         goto ssetup_exit;
 694                 }
 695
 696                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 697                 phase = NtLmChallenge; /* process ntlmssp challenge */
 698                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 699                 ses->Suid = rsp->hdr.SessionId;
 700                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 701                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 702         }
 703
 704         /*
 705          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 706          * but at least the raw NTLMSSP case works.
 707          */
 708         /*
 709          * No tcon so can't do
 710          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 711          */
 712         if (rc != 0)
 713                 goto ssetup_exit;
 714
 715         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 716         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
 717                 cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
 718 ssetup_exit:
 719         free_rsp_buf(resp_buftype, rsp);
 720
 721         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 722         if ((phase == NtLmChallenge) && (rc == 0))
 723                 goto ssetup_ntlmssp_authenticate;
 724
 725         if (!rc) {
 726                 mutex_lock(&server->srv_mutex);
 727                 if (server->sign && server->ops->generate_signingkey) {
 728                         rc = server->ops->generate_signingkey(ses);
 729                         kfree(ses->auth_key.response);
 730                         ses->auth_key.response = NULL;
 731                         if (rc) {
 732                                 cifs_dbg(FYI,
 733                                         "SMB3 session key generation failed\n");
 734                                 mutex_unlock(&server->srv_mutex);
 735                                 goto keygen_exit;
 736                         }
 737                 }
 738                 if (!server->session_estab) {
 739                         server->sequence_number = 0x2;
 740                         server->session_estab = true;
 741                 }
 742                 mutex_unlock(&server->srv_mutex);
 743
 744                 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 745                 spin_lock(&GlobalMid_Lock);
 746                 ses->status = CifsGood;
 747                 ses->need_reconnect = false;
 748                 spin_unlock(&GlobalMid_Lock);
 749         }
 750
 751 keygen_exit:
 752         if (!server->sign) {
 753                 kfree(ses->auth_key.response);
 754                 ses->auth_key.response = NULL;
 755         }
 756         kfree(ses->ntlmssp);
 757
 758         return rc;
 759 }
 760
 761 int
 762 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 763 {
 764         struct smb2_logoff_req *req; /* response is also trivial struct */
 765         int rc = 0;
 766         struct TCP_Server_Info *server;
 767
 768         cifs_dbg(FYI, "disconnect session %p\n", ses);
 769
 770         if (ses && (ses->server))
 771                 server = ses->server;
 772         else
 773                 return -EIO;
 774
 775         /* no need to send SMB logoff if uid already closed due to reconnect */
 776         if (ses->need_reconnect)
 777                 goto smb2_session_already_dead;
 778
 779         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 780         if (rc)
 781                 return rc;
 782
 783          /* since no tcon, smb2_init can not do this, so do here */
 784         req->hdr.SessionId = ses->Suid;
 785         if (server->sign)
 786                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 787
 788         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 789         /*
 790          * No tcon so can't do
 791          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 792          */
 793
 794 smb2_session_already_dead:
 795         return rc;
 796 }
 797
 798 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 799 {
 800         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 801 }
 802
 803 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 804
 805 /* These are similar values to what Windows uses */
 806 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
 807 {
 808         tcon->max_chunks = 256;
 809         tcon->max_bytes_chunk = 1048576;
 810         tcon->max_bytes_copy = 16777216;
 811 }
 812
 813 int
 814 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 815           struct cifs_tcon *tcon, const struct nls_table *cp)
 816 {
 817         struct smb2_tree_connect_req *req;
 818         struct smb2_tree_connect_rsp *rsp = NULL;
 819         struct kvec iov[2];
 820         int rc = 0;
 821         int resp_buftype;
 822         int unc_path_len;
 823         struct TCP_Server_Info *server;
 824         __le16 *unc_path = NULL;
 825
 826         cifs_dbg(FYI, "TCON\n");
 827
 828         if ((ses->server) && tree)
 829                 server = ses->server;
 830         else
 831                 return -EIO;
 832
 833         if (tcon && tcon->bad_network_name)
 834                 return -ENOENT;
 835
 836         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 837         if (unc_path == NULL)
 838                 return -ENOMEM;
 839
 840         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 841         unc_path_len *= 2;
 842         if (unc_path_len < 2) {
 843                 kfree(unc_path);
 844                 return -EINVAL;
 845         }
 846
 847         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 848         if (rc) {
 849                 kfree(unc_path);
 850                 return rc;
 851         }
 852
 853         if (tcon == NULL) {
 854                 /* since no tcon, smb2_init can not do this, so do here */
 855                 req->hdr.SessionId = ses->Suid;
 856                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 857                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 858         }
 859
 860         iov[0].iov_base = (char *)req;
 861         /* 4 for rfc1002 length field and 1 for pad */
 862         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 863
 864         /* Testing shows that buffer offset must be at location of Buffer[0] */
 865         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 866                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 867         req->PathLength = cpu_to_le16(unc_path_len - 2);
 868         iov[1].iov_base = unc_path;
 869         iov[1].iov_len = unc_path_len;
 870
 871         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 872
 873         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 874         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 875
 876         if (rc != 0) {
 877                 if (tcon) {
 878                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 879                         tcon->need_reconnect = true;
 880                 }
 881                 goto tcon_error_exit;
 882         }
 883
 884         if (tcon == NULL) {
 885                 ses->ipc_tid = rsp->hdr.TreeId;
 886                 goto tcon_exit;
 887         }
 888
 889         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 890                 cifs_dbg(FYI, "connection to disk share\n");
 891         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 892                 tcon->ipc = true;
 893                 cifs_dbg(FYI, "connection to pipe share\n");
 894         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 895                 tcon->print = true;
 896                 cifs_dbg(FYI, "connection to printer\n");
 897         } else {
 898                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 899                 rc = -EOPNOTSUPP;
 900                 goto tcon_error_exit;
 901         }
 902
 903         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 904         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
 905         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 906         tcon->tidStatus = CifsGood;
 907         tcon->need_reconnect = false;
 908         tcon->tid = rsp->hdr.TreeId;
 909         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
 910
 911         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 912             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 913                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
 914         init_copy_chunk_defaults(tcon);
 915         if (tcon->ses->server->ops->validate_negotiate)
 916                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
 917 tcon_exit:
 918         free_rsp_buf(resp_buftype, rsp);
 919         kfree(unc_path);
 920         return rc;
 921
 922 tcon_error_exit:
 923         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 924                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
 925                 tcon->bad_network_name = true;
 926         }
 927         goto tcon_exit;
 928 }
 929
 930 int
 931 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 932 {
 933         struct smb2_tree_disconnect_req *req; /* response is trivial */
 934         int rc = 0;
 935         struct TCP_Server_Info *server;
 936         struct cifs_ses *ses = tcon->ses;
 937
 938         cifs_dbg(FYI, "Tree Disconnect\n");
 939
 940         if (ses && (ses->server))
 941                 server = ses->server;
 942         else
 943                 return -EIO;
 944
 945         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 946                 return 0;
 947
 948         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 949         if (rc)
 950                 return rc;
 951
 952         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 953         if (rc)
 954                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 955
 956         return rc;
 957 }
 958
 959
 960 static struct create_durable *
 961 create_durable_buf(void)
 962 {
 963         struct create_durable *buf;
 964
 965         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 966         if (!buf)
 967                 return NULL;
 968
 969         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 970                                         (struct create_durable, Data));
 971         buf->ccontext.DataLength = cpu_to_le32(16);
 972         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 973                                 (struct create_durable, Name));
 974         buf->ccontext.NameLength = cpu_to_le16(4);
 975         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
 976         buf->Name[0] = 'D';
 977         buf->Name[1] = 'H';
 978         buf->Name[2] = 'n';
 979         buf->Name[3] = 'Q';
 980         return buf;
 981 }
 982
 983 static struct create_durable *
 984 create_reconnect_durable_buf(struct cifs_fid *fid)
 985 {
 986         struct create_durable *buf;
 987
 988         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
 989         if (!buf)
 990                 return NULL;
 991
 992         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 993                                         (struct create_durable, Data));
 994         buf->ccontext.DataLength = cpu_to_le32(16);
 995         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 996                                 (struct create_durable, Name));
 997         buf->ccontext.NameLength = cpu_to_le16(4);
 998         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
 999         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1000         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1001         buf->Name[0] = 'D';
1002         buf->Name[1] = 'H';
1003         buf->Name[2] = 'n';
1004         buf->Name[3] = 'C';
1005         return buf;
1006 }
1007
1008 static __u8
1009 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1010                   unsigned int *epoch)
1011 {
1012         char *data_offset;
1013         struct create_context *cc;
1014         unsigned int next = 0;
1015         char *name;
1016
1017         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1018         cc = (struct create_context *)data_offset;
1019         do {
1020                 cc = (struct create_context *)((char *)cc + next);
1021                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1022                 if (le16_to_cpu(cc->NameLength) != 4 ||
1023                     strncmp(name, "RqLs", 4)) {
1024                         next = le32_to_cpu(cc->Next);
1025                         continue;
1026                 }
1027                 return server->ops->parse_lease_buf(cc, epoch);
1028         } while (next != 0);
1029
1030         return 0;
1031 }
1032
1033 static int
1034 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1035                   unsigned int *num_iovec, __u8 *oplock)
1036 {
1037         struct smb2_create_req *req = iov[0].iov_base;
1038         unsigned int num = *num_iovec;
1039
1040         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1041         if (iov[num].iov_base == NULL)
1042                 return -ENOMEM;
1043         iov[num].iov_len = server->vals->create_lease_size;
1044         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1045         if (!req->CreateContextsOffset)
1046                 req->CreateContextsOffset = cpu_to_le32(
1047                                 sizeof(struct smb2_create_req) - 4 +
1048                                 iov[num - 1].iov_len);
1049         le32_add_cpu(&req->CreateContextsLength,
1050                      server->vals->create_lease_size);
1051         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1052         *num_iovec = num + 1;
1053         return 0;
1054 }
1055
1056 static int
1057 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1058                     struct cifs_open_parms *oparms)
1059 {
1060         struct smb2_create_req *req = iov[0].iov_base;
1061         unsigned int num = *num_iovec;
1062
1063         if (oparms->reconnect) {
1064                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1065                 /* indicate that we don't need to relock the file */
1066                 oparms->reconnect = false;
1067         } else
1068                 iov[num].iov_base = create_durable_buf();
1069         if (iov[num].iov_base == NULL)
1070                 return -ENOMEM;
1071         iov[num].iov_len = sizeof(struct create_durable);
1072         if (!req->CreateContextsOffset)
1073                 req->CreateContextsOffset =
1074                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1075                                                                 iov[1].iov_len);
1076         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1077         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1078         *num_iovec = num + 1;
1079         return 0;
1080 }
1081
1082 int
1083 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1084           __u8 *oplock, struct smb2_file_all_info *buf,
1085           struct smb2_err_rsp **err_buf)
1086 {
1087         struct smb2_create_req *req;
1088         struct smb2_create_rsp *rsp;
1089         struct TCP_Server_Info *server;
1090         struct cifs_tcon *tcon = oparms->tcon;
1091         struct cifs_ses *ses = tcon->ses;
1092         struct kvec iov[4];
1093         int resp_buftype;
1094         int uni_path_len;
1095         __le16 *copy_path = NULL;
1096         int copy_size;
1097         int rc = 0;
1098         unsigned int num_iovecs = 2;
1099         __u32 file_attributes = 0;
1100         char *dhc_buf = NULL, *lc_buf = NULL;
1101
1102         cifs_dbg(FYI, "create/open\n");
1103
1104         if (ses && (ses->server))
1105                 server = ses->server;
1106         else
1107                 return -EIO;
1108
1109         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1110         if (rc)
1111                 return rc;
1112
1113         if (oparms->create_options & CREATE_OPTION_READONLY)
1114                 file_attributes |= ATTR_READONLY;
1115
1116         req->ImpersonationLevel = IL_IMPERSONATION;
1117         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1118         /* File attributes ignored on open (used in create though) */
1119         req->FileAttributes = cpu_to_le32(file_attributes);
1120         req->ShareAccess = FILE_SHARE_ALL_LE;
1121         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1122         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1123         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1124         /* do not count rfc1001 len field */
1125         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
1126
1127         iov[0].iov_base = (char *)req;
1128         /* 4 for rfc1002 length field */
1129         iov[0].iov_len = get_rfc1002_length(req) + 4;
1130
1131         /* MUST set path len (NameLength) to 0 opening root of share */
1132         req->NameLength = cpu_to_le16(uni_path_len - 2);
1133         /* -1 since last byte is buf[0] which is sent below (path) */
1134         iov[0].iov_len--;
1135         if (uni_path_len % 8 != 0) {
1136                 copy_size = uni_path_len / 8 * 8;
1137                 if (copy_size < uni_path_len)
1138                         copy_size += 8;
1139
1140                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1141                 if (!copy_path)
1142                         return -ENOMEM;
1143                 memcpy((char *)copy_path, (const char *)path,
1144                         uni_path_len);
1145                 uni_path_len = copy_size;
1146                 path = copy_path;
1147         }
1148
1149         iov[1].iov_len = uni_path_len;
1150         iov[1].iov_base = path;
1151         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1152         inc_rfc1001_len(req, uni_path_len - 1);
1153
1154         if (!server->oplocks)
1155                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1156
1157         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1158             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1159                 req->RequestedOplockLevel = *oplock;
1160         else {
1161                 rc = add_lease_context(server, iov, &num_iovecs, oplock);
1162                 if (rc) {
1163                         cifs_small_buf_release(req);
1164                         kfree(copy_path);
1165                         return rc;
1166                 }
1167                 lc_buf = iov[num_iovecs-1].iov_base;
1168         }
1169
1170         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1171                 /* need to set Next field of lease context if we request it */
1172                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1173                         struct create_context *ccontext =
1174                             (struct create_context *)iov[num_iovecs-1].iov_base;
1175                         ccontext->Next =
1176                                 cpu_to_le32(server->vals->create_lease_size);
1177                 }
1178                 rc = add_durable_context(iov, &num_iovecs, oparms);
1179                 if (rc) {
1180                         cifs_small_buf_release(req);
1181                         kfree(copy_path);
1182                         kfree(lc_buf);
1183                         return rc;
1184                 }
1185                 dhc_buf = iov[num_iovecs-1].iov_base;
1186         }
1187
1188         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1189         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1190
1191         if (rc != 0) {
1192                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1193                 if (err_buf)
1194                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1195                                            GFP_KERNEL);
1196                 goto creat_exit;
1197         }
1198
1199         oparms->fid->persistent_fid = rsp->PersistentFileId;
1200         oparms->fid->volatile_fid = rsp->VolatileFileId;
1201
1202         if (buf) {
1203                 memcpy(buf, &rsp->CreationTime, 32);
1204                 buf->AllocationSize = rsp->AllocationSize;
1205                 buf->EndOfFile = rsp->EndofFile;
1206                 buf->Attributes = rsp->FileAttributes;
1207                 buf->NumberOfLinks = cpu_to_le32(1);
1208                 buf->DeletePending = 0;
1209         }
1210
1211         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1212                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1213         else
1214                 *oplock = rsp->OplockLevel;
1215 creat_exit:
1216         kfree(copy_path);
1217         kfree(lc_buf);
1218         kfree(dhc_buf);
1219         free_rsp_buf(resp_buftype, rsp);
1220         return rc;
1221 }
1222
1223 /*
1224  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1225  */
1226 int
1227 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1228            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1229            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1230 {
1231         struct smb2_ioctl_req *req;
1232         struct smb2_ioctl_rsp *rsp;
1233         struct TCP_Server_Info *server;
1234         struct cifs_ses *ses = tcon->ses;
1235         struct kvec iov[2];
1236         int resp_buftype;
1237         int num_iovecs;
1238         int rc = 0;
1239
1240         cifs_dbg(FYI, "SMB2 IOCTL\n");
1241
1242         *out_data = NULL;
1243         /* zero out returned data len, in case of error */
1244         if (plen)
1245                 *plen = 0;
1246
1247         if (ses && (ses->server))
1248                 server = ses->server;
1249         else
1250                 return -EIO;
1251
1252         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1253         if (rc)
1254                 return rc;
1255
1256         req->CtlCode = cpu_to_le32(opcode);
1257         req->PersistentFileId = persistent_fid;
1258         req->VolatileFileId = volatile_fid;
1259
1260         if (indatalen) {
1261                 req->InputCount = cpu_to_le32(indatalen);
1262                 /* do not set InputOffset if no input data */
1263                 req->InputOffset =
1264                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1265                 iov[1].iov_base = in_data;
1266                 iov[1].iov_len = indatalen;
1267                 num_iovecs = 2;
1268         } else
1269                 num_iovecs = 1;
1270
1271         req->OutputOffset = 0;
1272         req->OutputCount = 0; /* MBZ */
1273
1274         /*
1275          * Could increase MaxOutputResponse, but that would require more
1276          * than one credit. Windows typically sets this smaller, but for some
1277          * ioctls it may be useful to allow server to send more. No point
1278          * limiting what the server can send as long as fits in one credit
1279          */
1280         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1281
1282         if (is_fsctl)
1283                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1284         else
1285                 req->Flags = 0;
1286
1287         iov[0].iov_base = (char *)req;
1288
1289         /*
1290          * If no input data, the size of ioctl struct in
1291          * protocol spec still includes a 1 byte data buffer,
1292          * but if input data passed to ioctl, we do not
1293          * want to double count this, so we do not send
1294          * the dummy one byte of data in iovec[0] if sending
1295          * input data (in iovec[1]). We also must add 4 bytes
1296          * in first iovec to allow for rfc1002 length field.
1297          */
1298
1299         if (indatalen) {
1300                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1301                 inc_rfc1001_len(req, indatalen - 1);
1302         } else
1303                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1304
1305
1306         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1307         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1308
1309         if ((rc != 0) && (rc != -EINVAL)) {
1310                 if (tcon)
1311                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1312                 goto ioctl_exit;
1313         } else if (rc == -EINVAL) {
1314                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1315                     (opcode != FSCTL_SRV_COPYCHUNK)) {
1316                         if (tcon)
1317                                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1318                         goto ioctl_exit;
1319                 }
1320         }
1321
1322         /* check if caller wants to look at return data or just return rc */
1323         if ((plen == NULL) || (out_data == NULL))
1324                 goto ioctl_exit;
1325
1326         *plen = le32_to_cpu(rsp->OutputCount);
1327
1328         /* We check for obvious errors in the output buffer length and offset */
1329         if (*plen == 0)
1330                 goto ioctl_exit; /* server returned no data */
1331         else if (*plen > 0xFF00) {
1332                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1333                 *plen = 0;
1334                 rc = -EIO;
1335                 goto ioctl_exit;
1336         }
1337
1338         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1339                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1340                         le32_to_cpu(rsp->OutputOffset));
1341                 *plen = 0;
1342                 rc = -EIO;
1343                 goto ioctl_exit;
1344         }
1345
1346         *out_data = kmalloc(*plen, GFP_KERNEL);
1347         if (*out_data == NULL) {
1348                 rc = -ENOMEM;
1349                 goto ioctl_exit;
1350         }
1351
1352         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1353                *plen);
1354 ioctl_exit:
1355         free_rsp_buf(resp_buftype, rsp);
1356         return rc;
1357 }
1358
1359 /*
1360  *   Individual callers to ioctl worker function follow
1361  */
1362
1363 int
1364 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1365                      u64 persistent_fid, u64 volatile_fid)
1366 {
1367         int rc;
1368         struct  compress_ioctl fsctl_input;
1369         char *ret_data = NULL;
1370
1371         fsctl_input.CompressionState =
1372                         __constant_cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1373
1374         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1375                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1376                         (char *)&fsctl_input /* data input */,
1377                         2 /* in data len */, &ret_data /* out data */, NULL);
1378
1379         cifs_dbg(FYI, "set compression rc %d\n", rc);
1380
1381         return rc;
1382 }
1383
1384 int
1385 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1386            u64 persistent_fid, u64 volatile_fid)
1387 {
1388         struct smb2_close_req *req;
1389         struct smb2_close_rsp *rsp;
1390         struct TCP_Server_Info *server;
1391         struct cifs_ses *ses = tcon->ses;
1392         struct kvec iov[1];
1393         int resp_buftype;
1394         int rc = 0;
1395
1396         cifs_dbg(FYI, "Close\n");
1397
1398         if (ses && (ses->server))
1399                 server = ses->server;
1400         else
1401                 return -EIO;
1402
1403         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1404         if (rc)
1405                 return rc;
1406
1407         req->PersistentFileId = persistent_fid;
1408         req->VolatileFileId = volatile_fid;
1409
1410         iov[0].iov_base = (char *)req;
1411         /* 4 for rfc1002 length field */
1412         iov[0].iov_len = get_rfc1002_length(req) + 4;
1413
1414         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1415         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1416
1417         if (rc != 0) {
1418                 if (tcon)
1419                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1420                 goto close_exit;
1421         }
1422
1423         /* BB FIXME - decode close response, update inode for caching */
1424
1425 close_exit:
1426         free_rsp_buf(resp_buftype, rsp);
1427         return rc;
1428 }
1429
1430 static int
1431 validate_buf(unsigned int offset, unsigned int buffer_length,
1432              struct smb2_hdr *hdr, unsigned int min_buf_size)
1433
1434 {
1435         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1436         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1437         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1438         char *end_of_buf = begin_of_buf + buffer_length;
1439
1440
1441         if (buffer_length < min_buf_size) {
1442                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1443                          buffer_length, min_buf_size);
1444                 return -EINVAL;
1445         }
1446
1447         /* check if beyond RFC1001 maximum length */
1448         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1449                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1450                          buffer_length, smb_len);
1451                 return -EINVAL;
1452         }
1453
1454         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1455                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1456                 return -EINVAL;
1457         }
1458
1459         return 0;
1460 }
1461
1462 /*
1463  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1464  * Caller must free buffer.
1465  */
1466 static int
1467 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1468                       struct smb2_hdr *hdr, unsigned int minbufsize,
1469                       char *data)
1470
1471 {
1472         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1473         int rc;
1474
1475         if (!data)
1476                 return -EINVAL;
1477
1478         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1479         if (rc)
1480                 return rc;
1481
1482         memcpy(data, begin_of_buf, buffer_length);
1483
1484         return 0;
1485 }
1486
1487 static int
1488 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1489            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1490            size_t output_len, size_t min_len, void *data)
1491 {
1492         struct smb2_query_info_req *req;
1493         struct smb2_query_info_rsp *rsp = NULL;
1494         struct kvec iov[2];
1495         int rc = 0;
1496         int resp_buftype;
1497         struct TCP_Server_Info *server;
1498         struct cifs_ses *ses = tcon->ses;
1499
1500         cifs_dbg(FYI, "Query Info\n");
1501
1502         if (ses && (ses->server))
1503                 server = ses->server;
1504         else
1505                 return -EIO;
1506
1507         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1508         if (rc)
1509                 return rc;
1510
1511         req->InfoType = SMB2_O_INFO_FILE;
1512         req->FileInfoClass = info_class;
1513         req->PersistentFileId = persistent_fid;
1514         req->VolatileFileId = volatile_fid;
1515         /* 4 for rfc1002 length field and 1 for Buffer */
1516         req->InputBufferOffset =
1517                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1518         req->OutputBufferLength = cpu_to_le32(output_len);
1519
1520         iov[0].iov_base = (char *)req;
1521         /* 4 for rfc1002 length field */
1522         iov[0].iov_len = get_rfc1002_length(req) + 4;
1523
1524         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1525         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1526
1527         if (rc) {
1528                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1529                 goto qinf_exit;
1530         }
1531
1532         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1533                                    le32_to_cpu(rsp->OutputBufferLength),
1534                                    &rsp->hdr, min_len, data);
1535
1536 qinf_exit:
1537         free_rsp_buf(resp_buftype, rsp);
1538         return rc;
1539 }
1540
1541 int
1542 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1543                 u64 persistent_fid, u64 volatile_fid,
1544                 struct smb2_file_all_info *data)
1545 {
1546         return query_info(xid, tcon, persistent_fid, volatile_fid,
1547                           FILE_ALL_INFORMATION,
1548                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1549                           sizeof(struct smb2_file_all_info), data);
1550 }
1551
1552 int
1553 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1554                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1555 {
1556         return query_info(xid, tcon, persistent_fid, volatile_fid,
1557                           FILE_INTERNAL_INFORMATION,
1558                           sizeof(struct smb2_file_internal_info),
1559                           sizeof(struct smb2_file_internal_info), uniqueid);
1560 }
1561
1562 /*
1563  * This is a no-op for now. We're not really interested in the reply, but
1564  * rather in the fact that the server sent one and that server->lstrp
1565  * gets updated.
1566  *
1567  * FIXME: maybe we should consider checking that the reply matches request?
1568  */
1569 static void
1570 smb2_echo_callback(struct mid_q_entry *mid)
1571 {
1572         struct TCP_Server_Info *server = mid->callback_data;
1573         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1574         unsigned int credits_received = 1;
1575
1576         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1577                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1578
1579         DeleteMidQEntry(mid);
1580         add_credits(server, credits_received, CIFS_ECHO_OP);
1581 }
1582
1583 int
1584 SMB2_echo(struct TCP_Server_Info *server)
1585 {
1586         struct smb2_echo_req *req;
1587         int rc = 0;
1588         struct kvec iov;
1589         struct smb_rqst rqst = { .rq_iov = &iov,
1590                                  .rq_nvec = 1 };
1591
1592         cifs_dbg(FYI, "In echo request\n");
1593
1594         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1595         if (rc)
1596                 return rc;
1597
1598         req->hdr.CreditRequest = cpu_to_le16(1);
1599
1600         iov.iov_base = (char *)req;
1601         /* 4 for rfc1002 length field */
1602         iov.iov_len = get_rfc1002_length(req) + 4;
1603
1604         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1605                              CIFS_ECHO_OP);
1606         if (rc)
1607                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1608
1609         cifs_small_buf_release(req);
1610         return rc;
1611 }
1612
1613 int
1614 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1615            u64 volatile_fid)
1616 {
1617         struct smb2_flush_req *req;
1618         struct TCP_Server_Info *server;
1619         struct cifs_ses *ses = tcon->ses;
1620         struct kvec iov[1];
1621         int resp_buftype;
1622         int rc = 0;
1623
1624         cifs_dbg(FYI, "Flush\n");
1625
1626         if (ses && (ses->server))
1627                 server = ses->server;
1628         else
1629                 return -EIO;
1630
1631         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1632         if (rc)
1633                 return rc;
1634
1635         req->PersistentFileId = persistent_fid;
1636         req->VolatileFileId = volatile_fid;
1637
1638         iov[0].iov_base = (char *)req;
1639         /* 4 for rfc1002 length field */
1640         iov[0].iov_len = get_rfc1002_length(req) + 4;
1641
1642         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1643
1644         if ((rc != 0) && tcon)
1645                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1646
1647         free_rsp_buf(resp_buftype, iov[0].iov_base);
1648         return rc;
1649 }
1650
1651 /*
1652  * To form a chain of read requests, any read requests after the first should
1653  * have the end_of_chain boolean set to true.
1654  */
1655 static int
1656 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1657                   unsigned int remaining_bytes, int request_type)
1658 {
1659         int rc = -EACCES;
1660         struct smb2_read_req *req = NULL;
1661
1662         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1663         if (rc)
1664                 return rc;
1665         if (io_parms->tcon->ses->server == NULL)
1666                 return -ECONNABORTED;
1667
1668         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1669
1670         req->PersistentFileId = io_parms->persistent_fid;
1671         req->VolatileFileId = io_parms->volatile_fid;
1672         req->ReadChannelInfoOffset = 0; /* reserved */
1673         req->ReadChannelInfoLength = 0; /* reserved */
1674         req->Channel = 0; /* reserved */
1675         req->MinimumCount = 0;
1676         req->Length = cpu_to_le32(io_parms->length);
1677         req->Offset = cpu_to_le64(io_parms->offset);
1678
1679         if (request_type & CHAINED_REQUEST) {
1680                 if (!(request_type & END_OF_CHAIN)) {
1681                         /* 4 for rfc1002 length field */
1682                         req->hdr.NextCommand =
1683                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1684                 } else /* END_OF_CHAIN */
1685                         req->hdr.NextCommand = 0;
1686                 if (request_type & RELATED_REQUEST) {
1687                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1688                         /*
1689                          * Related requests use info from previous read request
1690                          * in chain.
1691                          */
1692                         req->hdr.SessionId = 0xFFFFFFFF;
1693                         req->hdr.TreeId = 0xFFFFFFFF;
1694                         req->PersistentFileId = 0xFFFFFFFF;
1695                         req->VolatileFileId = 0xFFFFFFFF;
1696                 }
1697         }
1698         if (remaining_bytes > io_parms->length)
1699                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1700         else
1701                 req->RemainingBytes = 0;
1702
1703         iov[0].iov_base = (char *)req;
1704         /* 4 for rfc1002 length field */
1705         iov[0].iov_len = get_rfc1002_length(req) + 4;
1706         return rc;
1707 }
1708
1709 static void
1710 smb2_readv_callback(struct mid_q_entry *mid)
1711 {
1712         struct cifs_readdata *rdata = mid->callback_data;
1713         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1714         struct TCP_Server_Info *server = tcon->ses->server;
1715         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1716         unsigned int credits_received = 1;
1717         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1718                                  .rq_nvec = 1,
1719                                  .rq_pages = rdata->pages,
1720                                  .rq_npages = rdata->nr_pages,
1721                                  .rq_pagesz = rdata->pagesz,
1722                                  .rq_tailsz = rdata->tailsz };
1723
1724         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1725                  __func__, mid->mid, mid->mid_state, rdata->result,
1726                  rdata->bytes);
1727
1728         switch (mid->mid_state) {
1729         case MID_RESPONSE_RECEIVED:
1730                 credits_received = le16_to_cpu(buf->CreditRequest);
1731                 /* result already set, check signature */
1732                 if (server->sign) {
1733                         int rc;
1734
1735                         rc = smb2_verify_signature(&rqst, server);
1736                         if (rc)
1737                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1738                                          rc);
1739                 }
1740                 /* FIXME: should this be counted toward the initiating task? */
1741                 task_io_account_read(rdata->bytes);
1742                 cifs_stats_bytes_read(tcon, rdata->bytes);
1743                 break;
1744         case MID_REQUEST_SUBMITTED:
1745         case MID_RETRY_NEEDED:
1746                 rdata->result = -EAGAIN;
1747                 break;
1748         default:
1749                 if (rdata->result != -ENODATA)
1750                         rdata->result = -EIO;
1751         }
1752
1753         if (rdata->result)
1754                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1755
1756         queue_work(cifsiod_wq, &rdata->work);
1757         DeleteMidQEntry(mid);
1758         add_credits(server, credits_received, 0);
1759 }
1760
1761 /* smb2_async_readv - send an async write, and set up mid to handle result */
1762 int
1763 smb2_async_readv(struct cifs_readdata *rdata)
1764 {
1765         int rc;
1766         struct smb2_hdr *buf;
1767         struct cifs_io_parms io_parms;
1768         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1769                                  .rq_nvec = 1 };
1770
1771         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1772                  __func__, rdata->offset, rdata->bytes);
1773
1774         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1775         io_parms.offset = rdata->offset;
1776         io_parms.length = rdata->bytes;
1777         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1778         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1779         io_parms.pid = rdata->pid;
1780         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1781         if (rc)
1782                 return rc;
1783
1784         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1785         /* 4 for rfc1002 length field */
1786         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1787
1788         kref_get(&rdata->refcount);
1789         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1790                              cifs_readv_receive, smb2_readv_callback,
1791                              rdata, 0);
1792         if (rc) {
1793                 kref_put(&rdata->refcount, cifs_readdata_release);
1794                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1795         }
1796
1797         cifs_small_buf_release(buf);
1798         return rc;
1799 }
1800
1801 int
1802 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1803           unsigned int *nbytes, char **buf, int *buf_type)
1804 {
1805         int resp_buftype, rc = -EACCES;
1806         struct smb2_read_rsp *rsp = NULL;
1807         struct kvec iov[1];
1808
1809         *nbytes = 0;
1810         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1811         if (rc)
1812                 return rc;
1813
1814         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1815                           &resp_buftype, CIFS_LOG_ERROR);
1816
1817         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1818
1819         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1820                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1821                 return 0;
1822         }
1823
1824         if (rc) {
1825                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1826                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1827         } else {
1828                 *nbytes = le32_to_cpu(rsp->DataLength);
1829                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1830                     (*nbytes > io_parms->length)) {
1831                         cifs_dbg(FYI, "bad length %d for count %d\n",
1832                                  *nbytes, io_parms->length);
1833                         rc = -EIO;
1834                         *nbytes = 0;
1835                 }
1836         }
1837
1838         if (*buf) {
1839                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1840                        *nbytes);
1841                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1842         } else if (resp_buftype != CIFS_NO_BUFFER) {
1843                 *buf = iov[0].iov_base;
1844                 if (resp_buftype == CIFS_SMALL_BUFFER)
1845                         *buf_type = CIFS_SMALL_BUFFER;
1846                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1847                         *buf_type = CIFS_LARGE_BUFFER;
1848         }
1849         return rc;
1850 }
1851
1852 /*
1853  * Check the mid_state and signature on received buffer (if any), and queue the
1854  * workqueue completion task.
1855  */
1856 static void
1857 smb2_writev_callback(struct mid_q_entry *mid)
1858 {
1859         struct cifs_writedata *wdata = mid->callback_data;
1860         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1861         unsigned int written;
1862         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1863         unsigned int credits_received = 1;
1864
1865         switch (mid->mid_state) {
1866         case MID_RESPONSE_RECEIVED:
1867                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1868                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1869                 if (wdata->result != 0)
1870                         break;
1871
1872                 written = le32_to_cpu(rsp->DataLength);
1873                 /*
1874                  * Mask off high 16 bits when bytes written as returned
1875                  * by the server is greater than bytes requested by the
1876                  * client. OS/2 servers are known to set incorrect
1877                  * CountHigh values.
1878                  */
1879                 if (written > wdata->bytes)
1880                         written &= 0xFFFF;
1881
1882                 if (written < wdata->bytes)
1883                         wdata->result = -ENOSPC;
1884                 else
1885                         wdata->bytes = written;
1886                 break;
1887         case MID_REQUEST_SUBMITTED:
1888         case MID_RETRY_NEEDED:
1889                 wdata->result = -EAGAIN;
1890                 break;
1891         default:
1892                 wdata->result = -EIO;
1893                 break;
1894         }
1895
1896         if (wdata->result)
1897                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1898
1899         queue_work(cifsiod_wq, &wdata->work);
1900         DeleteMidQEntry(mid);
1901         add_credits(tcon->ses->server, credits_received, 0);
1902 }
1903
1904 /* smb2_async_writev - send an async write, and set up mid to handle result */
1905 int
1906 smb2_async_writev(struct cifs_writedata *wdata,
1907                   void (*release)(struct kref *kref))
1908 {
1909         int rc = -EACCES;
1910         struct smb2_write_req *req = NULL;
1911         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1912         struct kvec iov;
1913         struct smb_rqst rqst;
1914
1915         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1916         if (rc)
1917                 goto async_writev_out;
1918
1919         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1920
1921         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1922         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1923         req->WriteChannelInfoOffset = 0;
1924         req->WriteChannelInfoLength = 0;
1925         req->Channel = 0;
1926         req->Offset = cpu_to_le64(wdata->offset);
1927         /* 4 for rfc1002 length field */
1928         req->DataOffset = cpu_to_le16(
1929                                 offsetof(struct smb2_write_req, Buffer) - 4);
1930         req->RemainingBytes = 0;
1931
1932         /* 4 for rfc1002 length field and 1 for Buffer */
1933         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1934         iov.iov_base = req;
1935
1936         rqst.rq_iov = &iov;
1937         rqst.rq_nvec = 1;
1938         rqst.rq_pages = wdata->pages;
1939         rqst.rq_npages = wdata->nr_pages;
1940         rqst.rq_pagesz = wdata->pagesz;
1941         rqst.rq_tailsz = wdata->tailsz;
1942
1943         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1944                  wdata->offset, wdata->bytes);
1945
1946         req->Length = cpu_to_le32(wdata->bytes);
1947
1948         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1949
1950         kref_get(&wdata->refcount);
1951         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1952                                 smb2_writev_callback, wdata, 0);
1953
1954         if (rc) {
1955                 kref_put(&wdata->refcount, release);
1956                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1957         }
1958
1959 async_writev_out:
1960         cifs_small_buf_release(req);
1961         return rc;
1962 }
1963
1964 /*
1965  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1966  * The length field from io_parms must be at least 1 and indicates a number of
1967  * elements with data to write that begins with position 1 in iov array. All
1968  * data length is specified by count.
1969  */
1970 int
1971 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1972            unsigned int *nbytes, struct kvec *iov, int n_vec)
1973 {
1974         int rc = 0;
1975         struct smb2_write_req *req = NULL;
1976         struct smb2_write_rsp *rsp = NULL;
1977         int resp_buftype;
1978         *nbytes = 0;
1979
1980         if (n_vec < 1)
1981                 return rc;
1982
1983         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1984         if (rc)
1985                 return rc;
1986
1987         if (io_parms->tcon->ses->server == NULL)
1988                 return -ECONNABORTED;
1989
1990         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1991
1992         req->PersistentFileId = io_parms->persistent_fid;
1993         req->VolatileFileId = io_parms->volatile_fid;
1994         req->WriteChannelInfoOffset = 0;
1995         req->WriteChannelInfoLength = 0;
1996         req->Channel = 0;
1997         req->Length = cpu_to_le32(io_parms->length);
1998         req->Offset = cpu_to_le64(io_parms->offset);
1999         /* 4 for rfc1002 length field */
2000         req->DataOffset = cpu_to_le16(
2001                                 offsetof(struct smb2_write_req, Buffer) - 4);
2002         req->RemainingBytes = 0;
2003
2004         iov[0].iov_base = (char *)req;
2005         /* 4 for rfc1002 length field and 1 for Buffer */
2006         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2007
2008         /* length of entire message including data to be written */
2009         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2010
2011         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2012                           &resp_buftype, 0);
2013         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
2014
2015         if (rc) {
2016                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2017                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2018         } else
2019                 *nbytes = le32_to_cpu(rsp->DataLength);
2020
2021         free_rsp_buf(resp_buftype, rsp);
2022         return rc;
2023 }
2024
2025 static unsigned int
2026 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2027 {
2028         int len;
2029         unsigned int entrycount = 0;
2030         unsigned int next_offset = 0;
2031         FILE_DIRECTORY_INFO *entryptr;
2032
2033         if (bufstart == NULL)
2034                 return 0;
2035
2036         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2037
2038         while (1) {
2039                 entryptr = (FILE_DIRECTORY_INFO *)
2040                                         ((char *)entryptr + next_offset);
2041
2042                 if ((char *)entryptr + size > end_of_buf) {
2043                         cifs_dbg(VFS, "malformed search entry would overflow\n");
2044                         break;
2045                 }
2046
2047                 len = le32_to_cpu(entryptr->FileNameLength);
2048                 if ((char *)entryptr + len + size > end_of_buf) {
2049                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2050                                  end_of_buf);
2051                         break;
2052                 }
2053
2054                 *lastentry = (char *)entryptr;
2055                 entrycount++;
2056
2057                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2058                 if (!next_offset)
2059                         break;
2060         }
2061
2062         return entrycount;
2063 }
2064
2065 /*
2066  * Readdir/FindFirst
2067  */
2068 int
2069 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2070                      u64 persistent_fid, u64 volatile_fid, int index,
2071                      struct cifs_search_info *srch_inf)
2072 {
2073         struct smb2_query_directory_req *req;
2074         struct smb2_query_directory_rsp *rsp = NULL;
2075         struct kvec iov[2];
2076         int rc = 0;
2077         int len;
2078         int resp_buftype;
2079         unsigned char *bufptr;
2080         struct TCP_Server_Info *server;
2081         struct cifs_ses *ses = tcon->ses;
2082         __le16 asteriks = cpu_to_le16('*');
2083         char *end_of_smb;
2084         unsigned int output_size = CIFSMaxBufSize;
2085         size_t info_buf_size;
2086
2087         if (ses && (ses->server))
2088                 server = ses->server;
2089         else
2090                 return -EIO;
2091
2092         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2093         if (rc)
2094                 return rc;
2095
2096         switch (srch_inf->info_level) {
2097         case SMB_FIND_FILE_DIRECTORY_INFO:
2098                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2099                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2100                 break;
2101         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2102                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2103                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2104                 break;
2105         default:
2106                 cifs_dbg(VFS, "info level %u isn't supported\n",
2107                          srch_inf->info_level);
2108                 rc = -EINVAL;
2109                 goto qdir_exit;
2110         }
2111
2112         req->FileIndex = cpu_to_le32(index);
2113         req->PersistentFileId = persistent_fid;
2114         req->VolatileFileId = volatile_fid;
2115
2116         len = 0x2;
2117         bufptr = req->Buffer;
2118         memcpy(bufptr, &asteriks, len);
2119
2120         req->FileNameOffset =
2121                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2122         req->FileNameLength = cpu_to_le16(len);
2123         /*
2124          * BB could be 30 bytes or so longer if we used SMB2 specific
2125          * buffer lengths, but this is safe and close enough.
2126          */
2127         output_size = min_t(unsigned int, output_size, server->maxBuf);
2128         output_size = min_t(unsigned int, output_size, 2 << 15);
2129         req->OutputBufferLength = cpu_to_le32(output_size);
2130
2131         iov[0].iov_base = (char *)req;
2132         /* 4 for RFC1001 length and 1 for Buffer */
2133         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2134
2135         iov[1].iov_base = (char *)(req->Buffer);
2136         iov[1].iov_len = len;
2137
2138         inc_rfc1001_len(req, len - 1 /* Buffer */);
2139
2140         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2141         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2142
2143         if (rc) {
2144                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2145                 goto qdir_exit;
2146         }
2147
2148         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2149                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2150                           info_buf_size);
2151         if (rc)
2152                 goto qdir_exit;
2153
2154         srch_inf->unicode = true;
2155
2156         if (srch_inf->ntwrk_buf_start) {
2157                 if (srch_inf->smallBuf)
2158                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2159                 else
2160                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2161         }
2162         srch_inf->ntwrk_buf_start = (char *)rsp;
2163         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2164                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2165         /* 4 for rfc1002 length field */
2166         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2167         srch_inf->entries_in_buffer =
2168                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2169                                     &srch_inf->last_entry, info_buf_size);
2170         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2171         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2172                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2173                  srch_inf->srch_entries_start, srch_inf->last_entry);
2174         if (resp_buftype == CIFS_LARGE_BUFFER)
2175                 srch_inf->smallBuf = false;
2176         else if (resp_buftype == CIFS_SMALL_BUFFER)
2177                 srch_inf->smallBuf = true;
2178         else
2179                 cifs_dbg(VFS, "illegal search buffer type\n");
2180
2181         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
2182                 srch_inf->endOfSearch = 1;
2183         else
2184                 srch_inf->endOfSearch = 0;
2185
2186         return rc;
2187
2188 qdir_exit:
2189         free_rsp_buf(resp_buftype, rsp);
2190         return rc;
2191 }
2192
2193 static int
2194 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2195                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2196                unsigned int num, void **data, unsigned int *size)
2197 {
2198         struct smb2_set_info_req *req;
2199         struct smb2_set_info_rsp *rsp = NULL;
2200         struct kvec *iov;
2201         int rc = 0;
2202         int resp_buftype;
2203         unsigned int i;
2204         struct TCP_Server_Info *server;
2205         struct cifs_ses *ses = tcon->ses;
2206
2207         if (ses && (ses->server))
2208                 server = ses->server;
2209         else
2210                 return -EIO;
2211
2212         if (!num)
2213                 return -EINVAL;
2214
2215         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2216         if (!iov)
2217                 return -ENOMEM;
2218
2219         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2220         if (rc) {
2221                 kfree(iov);
2222                 return rc;
2223         }
2224
2225         req->hdr.ProcessId = cpu_to_le32(pid);
2226
2227         req->InfoType = SMB2_O_INFO_FILE;
2228         req->FileInfoClass = info_class;
2229         req->PersistentFileId = persistent_fid;
2230         req->VolatileFileId = volatile_fid;
2231
2232         /* 4 for RFC1001 length and 1 for Buffer */
2233         req->BufferOffset =
2234                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2235         req->BufferLength = cpu_to_le32(*size);
2236
2237         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2238
2239         memcpy(req->Buffer, *data, *size);
2240
2241         iov[0].iov_base = (char *)req;
2242         /* 4 for RFC1001 length */
2243         iov[0].iov_len = get_rfc1002_length(req) + 4;
2244
2245         for (i = 1; i < num; i++) {
2246                 inc_rfc1001_len(req, size[i]);
2247                 le32_add_cpu(&req->BufferLength, size[i]);
2248                 iov[i].iov_base = (char *)data[i];
2249                 iov[i].iov_len = size[i];
2250         }
2251
2252         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2253         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2254
2255         if (rc != 0)
2256                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2257
2258         free_rsp_buf(resp_buftype, rsp);
2259         kfree(iov);
2260         return rc;
2261 }
2262
2263 int
2264 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2265             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2266 {
2267         struct smb2_file_rename_info info;
2268         void **data;
2269         unsigned int size[2];
2270         int rc;
2271         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2272
2273         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2274         if (!data)
2275                 return -ENOMEM;
2276
2277         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2278                               /* 0 = fail if target already exists */
2279         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2280         info.FileNameLength = cpu_to_le32(len);
2281
2282         data[0] = &info;
2283         size[0] = sizeof(struct smb2_file_rename_info);
2284
2285         data[1] = target_file;
2286         size[1] = len + 2 /* null */;
2287
2288         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2289                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2290                            size);
2291         kfree(data);
2292         return rc;
2293 }
2294
2295 int
2296 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2297                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2298 {
2299         struct smb2_file_link_info info;
2300         void **data;
2301         unsigned int size[2];
2302         int rc;
2303         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2304
2305         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2306         if (!data)
2307                 return -ENOMEM;
2308
2309         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2310                               /* 0 = fail if link already exists */
2311         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2312         info.FileNameLength = cpu_to_le32(len);
2313
2314         data[0] = &info;
2315         size[0] = sizeof(struct smb2_file_link_info);
2316
2317         data[1] = target_file;
2318         size[1] = len + 2 /* null */;
2319
2320         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2321                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2322         kfree(data);
2323         return rc;
2324 }
2325
2326 int
2327 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2328              u64 volatile_fid, u32 pid, __le64 *eof)
2329 {
2330         struct smb2_file_eof_info info;
2331         void *data;
2332         unsigned int size;
2333
2334         info.EndOfFile = *eof;
2335
2336         data = &info;
2337         size = sizeof(struct smb2_file_eof_info);
2338
2339         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2340                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2341 }
2342
2343 int
2344 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2345               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2346 {
2347         unsigned int size;
2348         size = sizeof(FILE_BASIC_INFO);
2349         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2350                              current->tgid, FILE_BASIC_INFORMATION, 1,
2351                              (void **)&buf, &size);
2352 }
2353
2354 int
2355 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2356                   const u64 persistent_fid, const u64 volatile_fid,
2357                   __u8 oplock_level)
2358 {
2359         int rc;
2360         struct smb2_oplock_break *req = NULL;
2361
2362         cifs_dbg(FYI, "SMB2_oplock_break\n");
2363         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2364
2365         if (rc)
2366                 return rc;
2367
2368         req->VolatileFid = volatile_fid;
2369         req->PersistentFid = persistent_fid;
2370         req->OplockLevel = oplock_level;
2371         req->hdr.CreditRequest = cpu_to_le16(1);
2372
2373         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2374         /* SMB2 buffer freed by function above */
2375
2376         if (rc) {
2377                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2378                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2379         }
2380
2381         return rc;
2382 }
2383
2384 static void
2385 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2386                         struct kstatfs *kst)
2387 {
2388         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2389                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2390         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2391         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2392         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2393         return;
2394 }
2395
2396 static int
2397 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2398                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2399 {
2400         int rc;
2401         struct smb2_query_info_req *req;
2402
2403         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2404
2405         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2406                 return -EIO;
2407
2408         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2409         if (rc)
2410                 return rc;
2411
2412         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2413         req->FileInfoClass = level;
2414         req->PersistentFileId = persistent_fid;
2415         req->VolatileFileId = volatile_fid;
2416         /* 4 for rfc1002 length field and 1 for pad */
2417         req->InputBufferOffset =
2418                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2419         req->OutputBufferLength = cpu_to_le32(
2420                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2421
2422         iov->iov_base = (char *)req;
2423         /* 4 for rfc1002 length field */
2424         iov->iov_len = get_rfc1002_length(req) + 4;
2425         return 0;
2426 }
2427
2428 int
2429 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2430               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2431 {
2432         struct smb2_query_info_rsp *rsp = NULL;
2433         struct kvec iov;
2434         int rc = 0;
2435         int resp_buftype;
2436         struct cifs_ses *ses = tcon->ses;
2437         struct smb2_fs_full_size_info *info = NULL;
2438
2439         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2440                                 sizeof(struct smb2_fs_full_size_info),
2441                                 persistent_fid, volatile_fid);
2442         if (rc)
2443                 return rc;
2444
2445         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2446         if (rc) {
2447                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2448                 goto qfsinf_exit;
2449         }
2450         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2451
2452         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2453                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2454         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2455                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2456                           sizeof(struct smb2_fs_full_size_info));
2457         if (!rc)
2458                 copy_fs_info_to_kstatfs(info, fsdata);
2459
2460 qfsinf_exit:
2461         free_rsp_buf(resp_buftype, iov.iov_base);
2462         return rc;
2463 }
2464
2465 int
2466 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
2467               u64 persistent_fid, u64 volatile_fid, int level)
2468 {
2469         struct smb2_query_info_rsp *rsp = NULL;
2470         struct kvec iov;
2471         int rc = 0;
2472         int resp_buftype, max_len, min_len;
2473         struct cifs_ses *ses = tcon->ses;
2474         unsigned int rsp_len, offset;
2475
2476         if (level == FS_DEVICE_INFORMATION) {
2477                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2478                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2479         } else if (level == FS_ATTRIBUTE_INFORMATION) {
2480                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
2481                 min_len = MIN_FS_ATTR_INFO_SIZE;
2482         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
2483                 max_len = sizeof(struct smb3_fs_ss_info);
2484                 min_len = sizeof(struct smb3_fs_ss_info);
2485         } else {
2486                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
2487                 return -EINVAL;
2488         }
2489
2490         rc = build_qfs_info_req(&iov, tcon, level, max_len,
2491                                 persistent_fid, volatile_fid);
2492         if (rc)
2493                 return rc;
2494
2495         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2496         if (rc) {
2497                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2498                 goto qfsattr_exit;
2499         }
2500         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2501
2502         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
2503         offset = le16_to_cpu(rsp->OutputBufferOffset);
2504         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
2505         if (rc)
2506                 goto qfsattr_exit;
2507
2508         if (level == FS_ATTRIBUTE_INFORMATION)
2509                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
2510                         + (char *)&rsp->hdr, min_t(unsigned int,
2511                         rsp_len, max_len));
2512         else if (level == FS_DEVICE_INFORMATION)
2513                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
2514                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
2515         else if (level == FS_SECTOR_SIZE_INFORMATION) {
2516                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
2517                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
2518                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
2519                 tcon->perf_sector_size =
2520                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
2521         }
2522
2523 qfsattr_exit:
2524         free_rsp_buf(resp_buftype, iov.iov_base);
2525         return rc;
2526 }
2527
2528 int
2529 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2530            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2531            const __u32 num_lock, struct smb2_lock_element *buf)
2532 {
2533         int rc = 0;
2534         struct smb2_lock_req *req = NULL;
2535         struct kvec iov[2];
2536         int resp_buf_type;
2537         unsigned int count;
2538
2539         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2540
2541         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2542         if (rc)
2543                 return rc;
2544
2545         req->hdr.ProcessId = cpu_to_le32(pid);
2546         req->LockCount = cpu_to_le16(num_lock);
2547
2548         req->PersistentFileId = persist_fid;
2549         req->VolatileFileId = volatile_fid;
2550
2551         count = num_lock * sizeof(struct smb2_lock_element);
2552         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2553
2554         iov[0].iov_base = (char *)req;
2555         /* 4 for rfc1002 length field and count for all locks */
2556         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2557         iov[1].iov_base = (char *)buf;
2558         iov[1].iov_len = count;
2559
2560         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2561         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2562         if (rc) {
2563                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2564                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2565         }
2566
2567         return rc;
2568 }
2569
2570 int
2571 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2572           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2573           const __u64 length, const __u64 offset, const __u32 lock_flags,
2574           const bool wait)
2575 {
2576         struct smb2_lock_element lock;
2577
2578         lock.Offset = cpu_to_le64(offset);
2579         lock.Length = cpu_to_le64(length);
2580         lock.Flags = cpu_to_le32(lock_flags);
2581         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2582                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2583
2584         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2585 }
2586
2587 int
2588 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2589                  __u8 *lease_key, const __le32 lease_state)
2590 {
2591         int rc;
2592         struct smb2_lease_ack *req = NULL;
2593
2594         cifs_dbg(FYI, "SMB2_lease_break\n");
2595         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2596
2597         if (rc)
2598                 return rc;
2599
2600         req->hdr.CreditRequest = cpu_to_le16(1);
2601         req->StructureSize = cpu_to_le16(36);
2602         inc_rfc1001_len(req, 12);
2603
2604         memcpy(req->LeaseKey, lease_key, 16);
2605         req->LeaseState = lease_state;
2606
2607         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2608         /* SMB2 buffer freed by function above */
2609
2610         if (rc) {
2611                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2612                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2613         }
2614
2615         return rc;
2616 }