fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2012
   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         hdr->TreeId = tcon->tid;
 112         /* Uid is not converted */
 113         if (tcon->ses)
 114                 hdr->SessionId = tcon->ses->Suid;
 115         /* BB check following DFS flags BB */
 116         /* BB do we have to add check for SHI1005_FLAGS_DFS_ROOT too? */
 117         if (tcon->share_flags & SHI1005_FLAGS_DFS)
 118                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS;
 119         /* BB how does SMB2 do case sensitive? */
 120         /* if (tcon->nocase)
 121                 hdr->Flags |= SMBFLG_CASELESS; */
 122         if (tcon->ses && tcon->ses->server &&
 123             (tcon->ses->server->sec_mode & SECMODE_SIGN_REQUIRED))
 124                 hdr->Flags |= SMB2_FLAGS_SIGNED;
 125 out:
 126         pdu->StructureSize2 = cpu_to_le16(parmsize);
 127         return;
 128 }
 129
 130 static int
 131 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 132 {
 133         int rc = 0;
 134         struct nls_table *nls_codepage;
 135         struct cifs_ses *ses;
 136         struct TCP_Server_Info *server;
 137
 138         /*
 139          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 140          * check for tcp and smb session status done differently
 141          * for those three - in the calling routine.
 142          */
 143         if (tcon == NULL)
 144                 return rc;
 145
 146         if (smb2_command == SMB2_TREE_CONNECT)
 147                 return rc;
 148
 149         if (tcon->tidStatus == CifsExiting) {
 150                 /*
 151                  * only tree disconnect, open, and write,
 152                  * (and ulogoff which does not have tcon)
 153                  * are allowed as we start force umount.
 154                  */
 155                 if ((smb2_command != SMB2_WRITE) &&
 156                    (smb2_command != SMB2_CREATE) &&
 157                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 158                         cFYI(1, "can not send cmd %d while umounting",
 159                                 smb2_command);
 160                         return -ENODEV;
 161                 }
 162         }
 163         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 164             (!tcon->ses->server))
 165                 return -EIO;
 166
 167         ses = tcon->ses;
 168         server = ses->server;
 169
 170         /*
 171          * Give demultiplex thread up to 10 seconds to reconnect, should be
 172          * greater than cifs socket timeout which is 7 seconds
 173          */
 174         while (server->tcpStatus == CifsNeedReconnect) {
 175                 /*
 176                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 177                  * here since they are implicitly done when session drops.
 178                  */
 179                 switch (smb2_command) {
 180                 /*
 181                  * BB Should we keep oplock break and add flush to exceptions?
 182                  */
 183                 case SMB2_TREE_DISCONNECT:
 184                 case SMB2_CANCEL:
 185                 case SMB2_CLOSE:
 186                 case SMB2_OPLOCK_BREAK:
 187                         return -EAGAIN;
 188                 }
 189
 190                 wait_event_interruptible_timeout(server->response_q,
 191                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 192
 193                 /* are we still trying to reconnect? */
 194                 if (server->tcpStatus != CifsNeedReconnect)
 195                         break;
 196
 197                 /*
 198                  * on "soft" mounts we wait once. Hard mounts keep
 199                  * retrying until process is killed or server comes
 200                  * back on-line
 201                  */
 202                 if (!tcon->retry) {
 203                         cFYI(1, "gave up waiting on reconnect in smb_init");
 204                         return -EHOSTDOWN;
 205                 }
 206         }
 207
 208         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 209                 return rc;
 210
 211         nls_codepage = load_nls_default();
 212
 213         /*
 214          * need to prevent multiple threads trying to simultaneously reconnect
 215          * the same SMB session
 216          */
 217         mutex_lock(&tcon->ses->session_mutex);
 218         rc = cifs_negotiate_protocol(0, tcon->ses);
 219         if (!rc && tcon->ses->need_reconnect)
 220                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 221
 222         if (rc || !tcon->need_reconnect) {
 223                 mutex_unlock(&tcon->ses->session_mutex);
 224                 goto out;
 225         }
 226
 227         cifs_mark_open_files_invalid(tcon);
 228         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 229         mutex_unlock(&tcon->ses->session_mutex);
 230         cFYI(1, "reconnect tcon rc = %d", rc);
 231         if (rc)
 232                 goto out;
 233         atomic_inc(&tconInfoReconnectCount);
 234         /*
 235          * BB FIXME add code to check if wsize needs update due to negotiated
 236          * smb buffer size shrinking.
 237          */
 238 out:
 239         /*
 240          * Check if handle based operation so we know whether we can continue
 241          * or not without returning to caller to reset file handle.
 242          */
 243         /*
 244          * BB Is flush done by server on drop of tcp session? Should we special
 245          * case it and skip above?
 246          */
 247         switch (smb2_command) {
 248         case SMB2_FLUSH:
 249         case SMB2_READ:
 250         case SMB2_WRITE:
 251         case SMB2_LOCK:
 252         case SMB2_IOCTL:
 253         case SMB2_QUERY_DIRECTORY:
 254         case SMB2_CHANGE_NOTIFY:
 255         case SMB2_QUERY_INFO:
 256         case SMB2_SET_INFO:
 257                 return -EAGAIN;
 258         }
 259         unload_nls(nls_codepage);
 260         return rc;
 261 }
 262
 263 /*
 264  * Allocate and return pointer to an SMB request hdr, and set basic
 265  * SMB information in the SMB header. If the return code is zero, this
 266  * function must have filled in request_buf pointer.
 267  */
 268 static int
 269 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 270                 void **request_buf)
 271 {
 272         int rc = 0;
 273
 274         rc = smb2_reconnect(smb2_command, tcon);
 275         if (rc)
 276                 return rc;
 277
 278         /* BB eventually switch this to SMB2 specific small buf size */
 279         *request_buf = cifs_small_buf_get();
 280         if (*request_buf == NULL) {
 281                 /* BB should we add a retry in here if not a writepage? */
 282                 return -ENOMEM;
 283         }
 284
 285         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
 286
 287         if (tcon != NULL) {
 288 #ifdef CONFIG_CIFS_STATS2
 289                 uint16_t com_code = le16_to_cpu(smb2_command);
 290                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 291 #endif
 292                 cifs_stats_inc(&tcon->num_smbs_sent);
 293         }
 294
 295         return rc;
 296 }
 297
 298 static void
 299 free_rsp_buf(int resp_buftype, void *rsp)
 300 {
 301         if (resp_buftype == CIFS_SMALL_BUFFER)
 302                 cifs_small_buf_release(rsp);
 303         else if (resp_buftype == CIFS_LARGE_BUFFER)
 304                 cifs_buf_release(rsp);
 305 }
 306
 307
 308 /*
 309  *
 310  *      SMB2 Worker functions follow:
 311  *
 312  *      The general structure of the worker functions is:
 313  *      1) Call smb2_init (assembles SMB2 header)
 314  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 315  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 316  *      4) Decode SMB2 command specific fields in the fixed length area
 317  *      5) Decode variable length data area (if any for this SMB2 command type)
 318  *      6) Call free smb buffer
 319  *      7) return
 320  *
 321  */
 322
 323 int
 324 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 325 {
 326         struct smb2_negotiate_req *req;
 327         struct smb2_negotiate_rsp *rsp;
 328         struct kvec iov[1];
 329         int rc = 0;
 330         int resp_buftype;
 331         struct TCP_Server_Info *server;
 332         unsigned int sec_flags;
 333         u16 temp = 0;
 334         int blob_offset, blob_length;
 335         char *security_blob;
 336         int flags = CIFS_NEG_OP;
 337
 338         cFYI(1, "Negotiate protocol");
 339
 340         if (ses->server)
 341                 server = ses->server;
 342         else {
 343                 rc = -EIO;
 344                 return rc;
 345         }
 346
 347         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 348         if (rc)
 349                 return rc;
 350
 351         /* if any of auth flags (ie not sign or seal) are overriden use them */
 352         if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
 353                 sec_flags = ses->overrideSecFlg;  /* BB FIXME fix sign flags?*/
 354         else /* if override flags set only sign/seal OR them with global auth */
 355                 sec_flags = global_secflags | ses->overrideSecFlg;
 356
 357         cFYI(1, "sec_flags 0x%x", sec_flags);
 358
 359         req->hdr.SessionId = 0;
 360
 361         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 362
 363         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
 364         inc_rfc1001_len(req, 2);
 365
 366         /* only one of SMB2 signing flags may be set in SMB2 request */
 367         if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
 368                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 369         else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
 370                 temp = SMB2_NEGOTIATE_SIGNING_ENABLED;
 371
 372         req->SecurityMode = cpu_to_le16(temp);
 373
 374         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 375
 376         memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
 377
 378         iov[0].iov_base = (char *)req;
 379         /* 4 for rfc1002 length field */
 380         iov[0].iov_len = get_rfc1002_length(req) + 4;
 381
 382         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 383
 384         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 385         /*
 386          * No tcon so can't do
 387          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 388          */
 389         if (rc != 0)
 390                 goto neg_exit;
 391
 392         cFYI(1, "mode 0x%x", rsp->SecurityMode);
 393
 394         /* BB we may eventually want to match the negotiated vs. requested
 395            dialect, even though we are only requesting one at a time */
 396         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 397                 cFYI(1, "negotiated smb2.0 dialect");
 398         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 399                 cFYI(1, "negotiated smb2.1 dialect");
 400         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 401                 cFYI(1, "negotiated smb3.0 dialect");
 402         else {
 403                 cERROR(1, "Illegal dialect returned by server %d",
 404                            le16_to_cpu(rsp->DialectRevision));
 405                 rc = -EIO;
 406                 goto neg_exit;
 407         }
 408         server->dialect = le16_to_cpu(rsp->DialectRevision);
 409
 410         server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
 411         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 412         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 413         /* BB Do we need to validate the SecurityMode? */
 414         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 415         server->capabilities = le32_to_cpu(rsp->Capabilities);
 416         /* Internal types */
 417         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 418
 419         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 420                                                &rsp->hdr);
 421         if (blob_length == 0) {
 422                 cERROR(1, "missing security blob on negprot");
 423                 rc = -EIO;
 424                 goto neg_exit;
 425         }
 426
 427         cFYI(1, "sec_flags 0x%x", sec_flags);
 428         if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) {
 429                 cFYI(1, "Signing required");
 430                 if (!(server->sec_mode & (SMB2_NEGOTIATE_SIGNING_REQUIRED |
 431                       SMB2_NEGOTIATE_SIGNING_ENABLED))) {
 432                         cERROR(1, "signing required but server lacks support");
 433                         rc = -EOPNOTSUPP;
 434                         goto neg_exit;
 435                 }
 436                 server->sec_mode |= SECMODE_SIGN_REQUIRED;
 437         } else if (sec_flags & CIFSSEC_MAY_SIGN) {
 438                 cFYI(1, "Signing optional");
 439                 if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
 440                         cFYI(1, "Server requires signing");
 441                         server->sec_mode |= SECMODE_SIGN_REQUIRED;
 442                 } else {
 443                         server->sec_mode &=
 444                                 ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
 445                 }
 446         } else {
 447                 cFYI(1, "Signing disabled");
 448                 if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
 449                         cERROR(1, "Server requires packet signing to be enabled"
 450                                   " in /proc/fs/cifs/SecurityFlags.");
 451                         rc = -EOPNOTSUPP;
 452                         goto neg_exit;
 453                 }
 454                 server->sec_mode &=
 455                         ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
 456         }
 457
 458 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
 459         rc = decode_neg_token_init(security_blob, blob_length,
 460                                    &server->sec_type);
 461         if (rc == 1)
 462                 rc = 0;
 463         else if (rc == 0) {
 464                 rc = -EIO;
 465                 goto neg_exit;
 466         }
 467 #endif
 468
 469 neg_exit:
 470         free_rsp_buf(resp_buftype, rsp);
 471         return rc;
 472 }
 473
 474 int
 475 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 476                 const struct nls_table *nls_cp)
 477 {
 478         struct smb2_sess_setup_req *req;
 479         struct smb2_sess_setup_rsp *rsp = NULL;
 480         struct kvec iov[2];
 481         int rc = 0;
 482         int resp_buftype;
 483         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 484         struct TCP_Server_Info *server;
 485         unsigned int sec_flags;
 486         u8 temp = 0;
 487         u16 blob_length = 0;
 488         char *security_blob;
 489         char *ntlmssp_blob = NULL;
 490         bool use_spnego = false; /* else use raw ntlmssp */
 491
 492         cFYI(1, "Session Setup");
 493
 494         if (ses->server)
 495                 server = ses->server;
 496         else {
 497                 rc = -EIO;
 498                 return rc;
 499         }
 500
 501         /*
 502          * If memory allocation is successful, caller of this function
 503          * frees it.
 504          */
 505         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 506         if (!ses->ntlmssp)
 507                 return -ENOMEM;
 508
 509         ses->server->secType = RawNTLMSSP;
 510
 511 ssetup_ntlmssp_authenticate:
 512         if (phase == NtLmChallenge)
 513                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 514
 515         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 516         if (rc)
 517                 return rc;
 518
 519         /* if any of auth flags (ie not sign or seal) are overriden use them */
 520         if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
 521                 sec_flags = ses->overrideSecFlg;  /* BB FIXME fix sign flags?*/
 522         else /* if override flags set only sign/seal OR them with global auth */
 523                 sec_flags = global_secflags | ses->overrideSecFlg;
 524
 525         cFYI(1, "sec_flags 0x%x", sec_flags);
 526
 527         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 528         req->VcNumber = 0; /* MBZ */
 529         /* to enable echos and oplocks */
 530         req->hdr.CreditRequest = cpu_to_le16(3);
 531
 532         /* only one of SMB2 signing flags may be set in SMB2 request */
 533         if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
 534                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 535         else if (ses->server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED)
 536                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 537         else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
 538                 temp = SMB2_NEGOTIATE_SIGNING_ENABLED;
 539
 540         req->SecurityMode = temp;
 541         req->Capabilities = 0;
 542         req->Channel = 0; /* MBZ */
 543
 544         iov[0].iov_base = (char *)req;
 545         /* 4 for rfc1002 length field and 1 for pad */
 546         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 547         if (phase == NtLmNegotiate) {
 548                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 549                                        GFP_KERNEL);
 550                 if (ntlmssp_blob == NULL) {
 551                         rc = -ENOMEM;
 552                         goto ssetup_exit;
 553                 }
 554                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 555                 if (use_spnego) {
 556                         /* blob_length = build_spnego_ntlmssp_blob(
 557                                         &security_blob,
 558                                         sizeof(struct _NEGOTIATE_MESSAGE),
 559                                         ntlmssp_blob); */
 560                         /* BB eventually need to add this */
 561                         cERROR(1, "spnego not supported for SMB2 yet");
 562                         rc = -EOPNOTSUPP;
 563                         kfree(ntlmssp_blob);
 564                         goto ssetup_exit;
 565                 } else {
 566                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 567                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 568                         security_blob = ntlmssp_blob;
 569                 }
 570         } else if (phase == NtLmAuthenticate) {
 571                 req->hdr.SessionId = ses->Suid;
 572                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 573                                        GFP_KERNEL);
 574                 if (ntlmssp_blob == NULL) {
 575                         cERROR(1, "failed to malloc ntlmssp blob");
 576                         rc = -ENOMEM;
 577                         goto ssetup_exit;
 578                 }
 579                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 580                                              nls_cp);
 581                 if (rc) {
 582                         cFYI(1, "build_ntlmssp_auth_blob failed %d", rc);
 583                         goto ssetup_exit; /* BB double check error handling */
 584                 }
 585                 if (use_spnego) {
 586                         /* blob_length = build_spnego_ntlmssp_blob(
 587                                                         &security_blob,
 588                                                         blob_length,
 589                                                         ntlmssp_blob); */
 590                         cERROR(1, "spnego not supported for SMB2 yet");
 591                         rc = -EOPNOTSUPP;
 592                         kfree(ntlmssp_blob);
 593                         goto ssetup_exit;
 594                 } else {
 595                         security_blob = ntlmssp_blob;
 596                 }
 597         } else {
 598                 cERROR(1, "illegal ntlmssp phase");
 599                 rc = -EIO;
 600                 goto ssetup_exit;
 601         }
 602
 603         /* Testing shows that buffer offset must be at location of Buffer[0] */
 604         req->SecurityBufferOffset =
 605                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 606                                             1 /* pad */ - 4 /* rfc1001 len */);
 607         req->SecurityBufferLength = cpu_to_le16(blob_length);
 608         iov[1].iov_base = security_blob;
 609         iov[1].iov_len = blob_length;
 610
 611         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 612
 613         /* BB add code to build os and lm fields */
 614
 615         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 616                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 617
 618         kfree(security_blob);
 619         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 620         if (resp_buftype != CIFS_NO_BUFFER &&
 621             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 622                 if (phase != NtLmNegotiate) {
 623                         cERROR(1, "Unexpected more processing error");
 624                         goto ssetup_exit;
 625                 }
 626                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 627                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 628                         cERROR(1, "Invalid security buffer offset %d",
 629                                   le16_to_cpu(rsp->SecurityBufferOffset));
 630                         rc = -EIO;
 631                         goto ssetup_exit;
 632                 }
 633
 634                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 635                 phase = NtLmChallenge; /* process ntlmssp challenge */
 636                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 637                 ses->Suid = rsp->hdr.SessionId;
 638                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 639                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 640         }
 641
 642         /*
 643          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 644          * but at least the raw NTLMSSP case works.
 645          */
 646         /*
 647          * No tcon so can't do
 648          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 649          */
 650         if (rc != 0)
 651                 goto ssetup_exit;
 652
 653         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 654 ssetup_exit:
 655         free_rsp_buf(resp_buftype, rsp);
 656
 657         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 658         if ((phase == NtLmChallenge) && (rc == 0))
 659                 goto ssetup_ntlmssp_authenticate;
 660         return rc;
 661 }
 662
 663 int
 664 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 665 {
 666         struct smb2_logoff_req *req; /* response is also trivial struct */
 667         int rc = 0;
 668         struct TCP_Server_Info *server;
 669
 670         cFYI(1, "disconnect session %p", ses);
 671
 672         if (ses && (ses->server))
 673                 server = ses->server;
 674         else
 675                 return -EIO;
 676
 677         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 678         if (rc)
 679                 return rc;
 680
 681          /* since no tcon, smb2_init can not do this, so do here */
 682         req->hdr.SessionId = ses->Suid;
 683         if (server->sec_mode & SECMODE_SIGN_REQUIRED)
 684                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 685
 686         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 687         /*
 688          * No tcon so can't do
 689          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 690          */
 691         return rc;
 692 }
 693
 694 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 695 {
 696         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 697 }
 698
 699 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 700
 701 int
 702 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 703           struct cifs_tcon *tcon, const struct nls_table *cp)
 704 {
 705         struct smb2_tree_connect_req *req;
 706         struct smb2_tree_connect_rsp *rsp = NULL;
 707         struct kvec iov[2];
 708         int rc = 0;
 709         int resp_buftype;
 710         int unc_path_len;
 711         struct TCP_Server_Info *server;
 712         __le16 *unc_path = NULL;
 713
 714         cFYI(1, "TCON");
 715
 716         if ((ses->server) && tree)
 717                 server = ses->server;
 718         else
 719                 return -EIO;
 720
 721         if (tcon && tcon->bad_network_name)
 722                 return -ENOENT;
 723
 724         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 725         if (unc_path == NULL)
 726                 return -ENOMEM;
 727
 728         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 729         unc_path_len *= 2;
 730         if (unc_path_len < 2) {
 731                 kfree(unc_path);
 732                 return -EINVAL;
 733         }
 734
 735         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 736         if (rc) {
 737                 kfree(unc_path);
 738                 return rc;
 739         }
 740
 741         if (tcon == NULL) {
 742                 /* since no tcon, smb2_init can not do this, so do here */
 743                 req->hdr.SessionId = ses->Suid;
 744                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 745                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 746         }
 747
 748         iov[0].iov_base = (char *)req;
 749         /* 4 for rfc1002 length field and 1 for pad */
 750         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 751
 752         /* Testing shows that buffer offset must be at location of Buffer[0] */
 753         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 754                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 755         req->PathLength = cpu_to_le16(unc_path_len - 2);
 756         iov[1].iov_base = unc_path;
 757         iov[1].iov_len = unc_path_len;
 758
 759         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 760
 761         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 762         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 763
 764         if (rc != 0) {
 765                 if (tcon) {
 766                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 767                         tcon->need_reconnect = true;
 768                 }
 769                 goto tcon_error_exit;
 770         }
 771
 772         if (tcon == NULL) {
 773                 ses->ipc_tid = rsp->hdr.TreeId;
 774                 goto tcon_exit;
 775         }
 776
 777         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 778                 cFYI(1, "connection to disk share");
 779         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 780                 tcon->ipc = true;
 781                 cFYI(1, "connection to pipe share");
 782         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 783                 tcon->print = true;
 784                 cFYI(1, "connection to printer");
 785         } else {
 786                 cERROR(1, "unknown share type %d", rsp->ShareType);
 787                 rc = -EOPNOTSUPP;
 788                 goto tcon_error_exit;
 789         }
 790
 791         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 792         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 793         tcon->tidStatus = CifsGood;
 794         tcon->need_reconnect = false;
 795         tcon->tid = rsp->hdr.TreeId;
 796         strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
 797
 798         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 799             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 800                 cERROR(1, "DFS capability contradicts DFS flag");
 801
 802 tcon_exit:
 803         free_rsp_buf(resp_buftype, rsp);
 804         kfree(unc_path);
 805         return rc;
 806
 807 tcon_error_exit:
 808         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 809                 cERROR(1, "BAD_NETWORK_NAME: %s", tree);
 810                 tcon->bad_network_name = true;
 811         }
 812         goto tcon_exit;
 813 }
 814
 815 int
 816 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 817 {
 818         struct smb2_tree_disconnect_req *req; /* response is trivial */
 819         int rc = 0;
 820         struct TCP_Server_Info *server;
 821         struct cifs_ses *ses = tcon->ses;
 822
 823         cFYI(1, "Tree Disconnect");
 824
 825         if (ses && (ses->server))
 826                 server = ses->server;
 827         else
 828                 return -EIO;
 829
 830         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 831                 return 0;
 832
 833         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 834         if (rc)
 835                 return rc;
 836
 837         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 838         if (rc)
 839                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 840
 841         return rc;
 842 }
 843
 844 static struct create_lease *
 845 create_lease_buf(u8 *lease_key, u8 oplock)
 846 {
 847         struct create_lease *buf;
 848
 849         buf = kmalloc(sizeof(struct create_lease), GFP_KERNEL);
 850         if (!buf)
 851                 return NULL;
 852
 853         memset(buf, 0, sizeof(struct create_lease));
 854
 855         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
 856         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
 857         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
 858                 buf->lcontext.LeaseState = SMB2_LEASE_WRITE_CACHING |
 859                                            SMB2_LEASE_READ_CACHING;
 860         else if (oplock == SMB2_OPLOCK_LEVEL_II)
 861                 buf->lcontext.LeaseState = SMB2_LEASE_READ_CACHING;
 862         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
 863                 buf->lcontext.LeaseState = SMB2_LEASE_HANDLE_CACHING |
 864                                            SMB2_LEASE_READ_CACHING |
 865                                            SMB2_LEASE_WRITE_CACHING;
 866
 867         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 868                                         (struct create_lease, lcontext));
 869         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
 870         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 871                                 (struct create_lease, Name));
 872         buf->ccontext.NameLength = cpu_to_le16(4);
 873         buf->Name[0] = 'R';
 874         buf->Name[1] = 'q';
 875         buf->Name[2] = 'L';
 876         buf->Name[3] = 's';
 877         return buf;
 878 }
 879
 880 static __u8
 881 parse_lease_state(struct smb2_create_rsp *rsp)
 882 {
 883         char *data_offset;
 884         struct create_lease *lc;
 885         bool found = false;
 886
 887         data_offset = (char *)rsp;
 888         data_offset += 4 + le32_to_cpu(rsp->CreateContextsOffset);
 889         lc = (struct create_lease *)data_offset;
 890         do {
 891                 char *name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;
 892                 if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||
 893                     strncmp(name, "RqLs", 4)) {
 894                         lc = (struct create_lease *)((char *)lc
 895                                         + le32_to_cpu(lc->ccontext.Next));
 896                         continue;
 897                 }
 898                 if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
 899                         return SMB2_OPLOCK_LEVEL_NOCHANGE;
 900                 found = true;
 901                 break;
 902         } while (le32_to_cpu(lc->ccontext.Next) != 0);
 903
 904         if (!found)
 905                 return 0;
 906
 907         return smb2_map_lease_to_oplock(lc->lcontext.LeaseState);
 908 }
 909
 910 int
 911 SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
 912           u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
 913           __u32 create_disposition, __u32 file_attributes, __u32 create_options,
 914           __u8 *oplock, struct smb2_file_all_info *buf)
 915 {
 916         struct smb2_create_req *req;
 917         struct smb2_create_rsp *rsp;
 918         struct TCP_Server_Info *server;
 919         struct cifs_ses *ses = tcon->ses;
 920         struct kvec iov[3];
 921         int resp_buftype;
 922         int uni_path_len;
 923         __le16 *copy_path = NULL;
 924         int copy_size;
 925         int rc = 0;
 926         int num_iovecs = 2;
 927
 928         cFYI(1, "create/open");
 929
 930         if (ses && (ses->server))
 931                 server = ses->server;
 932         else
 933                 return -EIO;
 934
 935         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
 936         if (rc)
 937                 return rc;
 938
 939         req->ImpersonationLevel = IL_IMPERSONATION;
 940         req->DesiredAccess = cpu_to_le32(desired_access);
 941         /* File attributes ignored on open (used in create though) */
 942         req->FileAttributes = cpu_to_le32(file_attributes);
 943         req->ShareAccess = FILE_SHARE_ALL_LE;
 944         req->CreateDisposition = cpu_to_le32(create_disposition);
 945         req->CreateOptions = cpu_to_le32(create_options);
 946         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
 947         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)
 948                         - 8 /* pad */ - 4 /* do not count rfc1001 len field */);
 949
 950         iov[0].iov_base = (char *)req;
 951         /* 4 for rfc1002 length field */
 952         iov[0].iov_len = get_rfc1002_length(req) + 4;
 953
 954         /* MUST set path len (NameLength) to 0 opening root of share */
 955         if (uni_path_len >= 4) {
 956                 req->NameLength = cpu_to_le16(uni_path_len - 2);
 957                 /* -1 since last byte is buf[0] which is sent below (path) */
 958                 iov[0].iov_len--;
 959                 if (uni_path_len % 8 != 0) {
 960                         copy_size = uni_path_len / 8 * 8;
 961                         if (copy_size < uni_path_len)
 962                                 copy_size += 8;
 963
 964                         copy_path = kzalloc(copy_size, GFP_KERNEL);
 965                         if (!copy_path)
 966                                 return -ENOMEM;
 967                         memcpy((char *)copy_path, (const char *)path,
 968                                 uni_path_len);
 969                         uni_path_len = copy_size;
 970                         path = copy_path;
 971                 }
 972
 973                 iov[1].iov_len = uni_path_len;
 974                 iov[1].iov_base = path;
 975                 /*
 976                  * -1 since last byte is buf[0] which was counted in
 977                  * smb2_buf_len.
 978                  */
 979                 inc_rfc1001_len(req, uni_path_len - 1);
 980         } else {
 981                 iov[0].iov_len += 7;
 982                 req->hdr.smb2_buf_length = cpu_to_be32(be32_to_cpu(
 983                                 req->hdr.smb2_buf_length) + 8 - 1);
 984                 num_iovecs = 1;
 985                 req->NameLength = 0;
 986         }
 987
 988         if (!server->oplocks)
 989                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
 990
 991         if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
 992             *oplock == SMB2_OPLOCK_LEVEL_NONE)
 993                 req->RequestedOplockLevel = *oplock;
 994         else {
 995                 iov[num_iovecs].iov_base = create_lease_buf(oplock+1, *oplock);
 996                 if (iov[num_iovecs].iov_base == NULL) {
 997                         cifs_small_buf_release(req);
 998                         kfree(copy_path);
 999                         return -ENOMEM;
1000                 }
1001                 iov[num_iovecs].iov_len = sizeof(struct create_lease);
1002                 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1003                 req->CreateContextsOffset = cpu_to_le32(
1004                         sizeof(struct smb2_create_req) - 4 - 8 +
1005                         iov[num_iovecs-1].iov_len);
1006                 req->CreateContextsLength = cpu_to_le32(
1007                         sizeof(struct create_lease));
1008                 inc_rfc1001_len(&req->hdr, sizeof(struct create_lease));
1009                 num_iovecs++;
1010         }
1011
1012         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1013         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1014
1015         if (rc != 0) {
1016                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1017                 goto creat_exit;
1018         }
1019
1020         *persistent_fid = rsp->PersistentFileId;
1021         *volatile_fid = rsp->VolatileFileId;
1022
1023         if (buf) {
1024                 memcpy(buf, &rsp->CreationTime, 32);
1025                 buf->AllocationSize = rsp->AllocationSize;
1026                 buf->EndOfFile = rsp->EndofFile;
1027                 buf->Attributes = rsp->FileAttributes;
1028                 buf->NumberOfLinks = cpu_to_le32(1);
1029                 buf->DeletePending = 0;
1030         }
1031
1032         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1033                 *oplock = parse_lease_state(rsp);
1034         else
1035                 *oplock = rsp->OplockLevel;
1036 creat_exit:
1037         kfree(copy_path);
1038         free_rsp_buf(resp_buftype, rsp);
1039         return rc;
1040 }
1041
1042 int
1043 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1044            u64 persistent_fid, u64 volatile_fid)
1045 {
1046         struct smb2_close_req *req;
1047         struct smb2_close_rsp *rsp;
1048         struct TCP_Server_Info *server;
1049         struct cifs_ses *ses = tcon->ses;
1050         struct kvec iov[1];
1051         int resp_buftype;
1052         int rc = 0;
1053
1054         cFYI(1, "Close");
1055
1056         if (ses && (ses->server))
1057                 server = ses->server;
1058         else
1059                 return -EIO;
1060
1061         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1062         if (rc)
1063                 return rc;
1064
1065         req->PersistentFileId = persistent_fid;
1066         req->VolatileFileId = volatile_fid;
1067
1068         iov[0].iov_base = (char *)req;
1069         /* 4 for rfc1002 length field */
1070         iov[0].iov_len = get_rfc1002_length(req) + 4;
1071
1072         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1073         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1074
1075         if (rc != 0) {
1076                 if (tcon)
1077                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1078                 goto close_exit;
1079         }
1080
1081         /* BB FIXME - decode close response, update inode for caching */
1082
1083 close_exit:
1084         free_rsp_buf(resp_buftype, rsp);
1085         return rc;
1086 }
1087
1088 static int
1089 validate_buf(unsigned int offset, unsigned int buffer_length,
1090              struct smb2_hdr *hdr, unsigned int min_buf_size)
1091
1092 {
1093         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1094         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1095         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1096         char *end_of_buf = begin_of_buf + buffer_length;
1097
1098
1099         if (buffer_length < min_buf_size) {
1100                 cERROR(1, "buffer length %d smaller than minimum size %d",
1101                            buffer_length, min_buf_size);
1102                 return -EINVAL;
1103         }
1104
1105         /* check if beyond RFC1001 maximum length */
1106         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1107                 cERROR(1, "buffer length %d or smb length %d too large",
1108                            buffer_length, smb_len);
1109                 return -EINVAL;
1110         }
1111
1112         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1113                 cERROR(1, "illegal server response, bad offset to data");
1114                 return -EINVAL;
1115         }
1116
1117         return 0;
1118 }
1119
1120 /*
1121  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1122  * Caller must free buffer.
1123  */
1124 static int
1125 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1126                       struct smb2_hdr *hdr, unsigned int minbufsize,
1127                       char *data)
1128
1129 {
1130         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1131         int rc;
1132
1133         if (!data)
1134                 return -EINVAL;
1135
1136         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1137         if (rc)
1138                 return rc;
1139
1140         memcpy(data, begin_of_buf, buffer_length);
1141
1142         return 0;
1143 }
1144
1145 static int
1146 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1147            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1148            size_t output_len, size_t min_len, void *data)
1149 {
1150         struct smb2_query_info_req *req;
1151         struct smb2_query_info_rsp *rsp = NULL;
1152         struct kvec iov[2];
1153         int rc = 0;
1154         int resp_buftype;
1155         struct TCP_Server_Info *server;
1156         struct cifs_ses *ses = tcon->ses;
1157
1158         cFYI(1, "Query Info");
1159
1160         if (ses && (ses->server))
1161                 server = ses->server;
1162         else
1163                 return -EIO;
1164
1165         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1166         if (rc)
1167                 return rc;
1168
1169         req->InfoType = SMB2_O_INFO_FILE;
1170         req->FileInfoClass = info_class;
1171         req->PersistentFileId = persistent_fid;
1172         req->VolatileFileId = volatile_fid;
1173         /* 4 for rfc1002 length field and 1 for Buffer */
1174         req->InputBufferOffset =
1175                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1176         req->OutputBufferLength = cpu_to_le32(output_len);
1177
1178         iov[0].iov_base = (char *)req;
1179         /* 4 for rfc1002 length field */
1180         iov[0].iov_len = get_rfc1002_length(req) + 4;
1181
1182         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1183         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1184
1185         if (rc) {
1186                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1187                 goto qinf_exit;
1188         }
1189
1190         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1191                                    le32_to_cpu(rsp->OutputBufferLength),
1192                                    &rsp->hdr, min_len, data);
1193
1194 qinf_exit:
1195         free_rsp_buf(resp_buftype, rsp);
1196         return rc;
1197 }
1198
1199 int
1200 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1201                 u64 persistent_fid, u64 volatile_fid,
1202                 struct smb2_file_all_info *data)
1203 {
1204         return query_info(xid, tcon, persistent_fid, volatile_fid,
1205                           FILE_ALL_INFORMATION,
1206                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1207                           sizeof(struct smb2_file_all_info), data);
1208 }
1209
1210 int
1211 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1212                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1213 {
1214         return query_info(xid, tcon, persistent_fid, volatile_fid,
1215                           FILE_INTERNAL_INFORMATION,
1216                           sizeof(struct smb2_file_internal_info),
1217                           sizeof(struct smb2_file_internal_info), uniqueid);
1218 }
1219
1220 /*
1221  * This is a no-op for now. We're not really interested in the reply, but
1222  * rather in the fact that the server sent one and that server->lstrp
1223  * gets updated.
1224  *
1225  * FIXME: maybe we should consider checking that the reply matches request?
1226  */
1227 static void
1228 smb2_echo_callback(struct mid_q_entry *mid)
1229 {
1230         struct TCP_Server_Info *server = mid->callback_data;
1231         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1232         unsigned int credits_received = 1;
1233
1234         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1235                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1236
1237         DeleteMidQEntry(mid);
1238         add_credits(server, credits_received, CIFS_ECHO_OP);
1239 }
1240
1241 int
1242 SMB2_echo(struct TCP_Server_Info *server)
1243 {
1244         struct smb2_echo_req *req;
1245         int rc = 0;
1246         struct kvec iov;
1247         struct smb_rqst rqst = { .rq_iov = &iov,
1248                                  .rq_nvec = 1 };
1249
1250         cFYI(1, "In echo request");
1251
1252         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1253         if (rc)
1254                 return rc;
1255
1256         req->hdr.CreditRequest = cpu_to_le16(1);
1257
1258         iov.iov_base = (char *)req;
1259         /* 4 for rfc1002 length field */
1260         iov.iov_len = get_rfc1002_length(req) + 4;
1261
1262         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1263                              CIFS_ECHO_OP);
1264         if (rc)
1265                 cFYI(1, "Echo request failed: %d", rc);
1266
1267         cifs_small_buf_release(req);
1268         return rc;
1269 }
1270
1271 int
1272 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1273            u64 volatile_fid)
1274 {
1275         struct smb2_flush_req *req;
1276         struct TCP_Server_Info *server;
1277         struct cifs_ses *ses = tcon->ses;
1278         struct kvec iov[1];
1279         int resp_buftype;
1280         int rc = 0;
1281
1282         cFYI(1, "Flush");
1283
1284         if (ses && (ses->server))
1285                 server = ses->server;
1286         else
1287                 return -EIO;
1288
1289         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1290         if (rc)
1291                 return rc;
1292
1293         req->PersistentFileId = persistent_fid;
1294         req->VolatileFileId = volatile_fid;
1295
1296         iov[0].iov_base = (char *)req;
1297         /* 4 for rfc1002 length field */
1298         iov[0].iov_len = get_rfc1002_length(req) + 4;
1299
1300         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1301
1302         if ((rc != 0) && tcon)
1303                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1304
1305         free_rsp_buf(resp_buftype, iov[0].iov_base);
1306         return rc;
1307 }
1308
1309 /*
1310  * To form a chain of read requests, any read requests after the first should
1311  * have the end_of_chain boolean set to true.
1312  */
1313 static int
1314 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1315                   unsigned int remaining_bytes, int request_type)
1316 {
1317         int rc = -EACCES;
1318         struct smb2_read_req *req = NULL;
1319
1320         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1321         if (rc)
1322                 return rc;
1323         if (io_parms->tcon->ses->server == NULL)
1324                 return -ECONNABORTED;
1325
1326         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1327
1328         req->PersistentFileId = io_parms->persistent_fid;
1329         req->VolatileFileId = io_parms->volatile_fid;
1330         req->ReadChannelInfoOffset = 0; /* reserved */
1331         req->ReadChannelInfoLength = 0; /* reserved */
1332         req->Channel = 0; /* reserved */
1333         req->MinimumCount = 0;
1334         req->Length = cpu_to_le32(io_parms->length);
1335         req->Offset = cpu_to_le64(io_parms->offset);
1336
1337         if (request_type & CHAINED_REQUEST) {
1338                 if (!(request_type & END_OF_CHAIN)) {
1339                         /* 4 for rfc1002 length field */
1340                         req->hdr.NextCommand =
1341                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1342                 } else /* END_OF_CHAIN */
1343                         req->hdr.NextCommand = 0;
1344                 if (request_type & RELATED_REQUEST) {
1345                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1346                         /*
1347                          * Related requests use info from previous read request
1348                          * in chain.
1349                          */
1350                         req->hdr.SessionId = 0xFFFFFFFF;
1351                         req->hdr.TreeId = 0xFFFFFFFF;
1352                         req->PersistentFileId = 0xFFFFFFFF;
1353                         req->VolatileFileId = 0xFFFFFFFF;
1354                 }
1355         }
1356         if (remaining_bytes > io_parms->length)
1357                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1358         else
1359                 req->RemainingBytes = 0;
1360
1361         iov[0].iov_base = (char *)req;
1362         /* 4 for rfc1002 length field */
1363         iov[0].iov_len = get_rfc1002_length(req) + 4;
1364         return rc;
1365 }
1366
1367 static void
1368 smb2_readv_callback(struct mid_q_entry *mid)
1369 {
1370         struct cifs_readdata *rdata = mid->callback_data;
1371         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1372         struct TCP_Server_Info *server = tcon->ses->server;
1373         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1374         unsigned int credits_received = 1;
1375         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1376                                  .rq_nvec = 1,
1377                                  .rq_pages = rdata->pages,
1378                                  .rq_npages = rdata->nr_pages,
1379                                  .rq_pagesz = rdata->pagesz,
1380                                  .rq_tailsz = rdata->tailsz };
1381
1382         cFYI(1, "%s: mid=%llu state=%d result=%d bytes=%u", __func__,
1383                 mid->mid, mid->mid_state, rdata->result, rdata->bytes);
1384
1385         switch (mid->mid_state) {
1386         case MID_RESPONSE_RECEIVED:
1387                 credits_received = le16_to_cpu(buf->CreditRequest);
1388                 /* result already set, check signature */
1389                 if (server->sec_mode &
1390                     (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
1391                         int rc;
1392
1393                         rc = smb2_verify_signature(&rqst, server);
1394                         if (rc)
1395                                 cERROR(1, "SMB signature verification returned "
1396                                        "error = %d", rc);
1397                 }
1398                 /* FIXME: should this be counted toward the initiating task? */
1399                 task_io_account_read(rdata->bytes);
1400                 cifs_stats_bytes_read(tcon, rdata->bytes);
1401                 break;
1402         case MID_REQUEST_SUBMITTED:
1403         case MID_RETRY_NEEDED:
1404                 rdata->result = -EAGAIN;
1405                 break;
1406         default:
1407                 if (rdata->result != -ENODATA)
1408                         rdata->result = -EIO;
1409         }
1410
1411         if (rdata->result)
1412                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1413
1414         queue_work(cifsiod_wq, &rdata->work);
1415         DeleteMidQEntry(mid);
1416         add_credits(server, credits_received, 0);
1417 }
1418
1419 /* smb2_async_readv - send an async write, and set up mid to handle result */
1420 int
1421 smb2_async_readv(struct cifs_readdata *rdata)
1422 {
1423         int rc;
1424         struct smb2_hdr *buf;
1425         struct cifs_io_parms io_parms;
1426         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1427                                  .rq_nvec = 1 };
1428
1429         cFYI(1, "%s: offset=%llu bytes=%u", __func__,
1430                 rdata->offset, rdata->bytes);
1431
1432         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1433         io_parms.offset = rdata->offset;
1434         io_parms.length = rdata->bytes;
1435         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1436         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1437         io_parms.pid = rdata->pid;
1438         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1439         if (rc)
1440                 return rc;
1441
1442         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1443         /* 4 for rfc1002 length field */
1444         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1445
1446         kref_get(&rdata->refcount);
1447         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1448                              cifs_readv_receive, smb2_readv_callback,
1449                              rdata, 0);
1450         if (rc) {
1451                 kref_put(&rdata->refcount, cifs_readdata_release);
1452                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1453         }
1454
1455         cifs_small_buf_release(buf);
1456         return rc;
1457 }
1458
1459 int
1460 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1461           unsigned int *nbytes, char **buf, int *buf_type)
1462 {
1463         int resp_buftype, rc = -EACCES;
1464         struct smb2_read_rsp *rsp = NULL;
1465         struct kvec iov[1];
1466
1467         *nbytes = 0;
1468         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1469         if (rc)
1470                 return rc;
1471
1472         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1473                           &resp_buftype, CIFS_LOG_ERROR);
1474
1475         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1476
1477         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1478                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1479                 return 0;
1480         }
1481
1482         if (rc) {
1483                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1484                 cERROR(1, "Send error in read = %d", rc);
1485         } else {
1486                 *nbytes = le32_to_cpu(rsp->DataLength);
1487                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1488                     (*nbytes > io_parms->length)) {
1489                         cFYI(1, "bad length %d for count %d", *nbytes,
1490                                 io_parms->length);
1491                         rc = -EIO;
1492                         *nbytes = 0;
1493                 }
1494         }
1495
1496         if (*buf) {
1497                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1498                        *nbytes);
1499                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1500         } else if (resp_buftype != CIFS_NO_BUFFER) {
1501                 *buf = iov[0].iov_base;
1502                 if (resp_buftype == CIFS_SMALL_BUFFER)
1503                         *buf_type = CIFS_SMALL_BUFFER;
1504                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1505                         *buf_type = CIFS_LARGE_BUFFER;
1506         }
1507         return rc;
1508 }
1509
1510 /*
1511  * Check the mid_state and signature on received buffer (if any), and queue the
1512  * workqueue completion task.
1513  */
1514 static void
1515 smb2_writev_callback(struct mid_q_entry *mid)
1516 {
1517         struct cifs_writedata *wdata = mid->callback_data;
1518         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1519         unsigned int written;
1520         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1521         unsigned int credits_received = 1;
1522
1523         switch (mid->mid_state) {
1524         case MID_RESPONSE_RECEIVED:
1525                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1526                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1527                 if (wdata->result != 0)
1528                         break;
1529
1530                 written = le32_to_cpu(rsp->DataLength);
1531                 /*
1532                  * Mask off high 16 bits when bytes written as returned
1533                  * by the server is greater than bytes requested by the
1534                  * client. OS/2 servers are known to set incorrect
1535                  * CountHigh values.
1536                  */
1537                 if (written > wdata->bytes)
1538                         written &= 0xFFFF;
1539
1540                 if (written < wdata->bytes)
1541                         wdata->result = -ENOSPC;
1542                 else
1543                         wdata->bytes = written;
1544                 break;
1545         case MID_REQUEST_SUBMITTED:
1546         case MID_RETRY_NEEDED:
1547                 wdata->result = -EAGAIN;
1548                 break;
1549         default:
1550                 wdata->result = -EIO;
1551                 break;
1552         }
1553
1554         if (wdata->result)
1555                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1556
1557         queue_work(cifsiod_wq, &wdata->work);
1558         DeleteMidQEntry(mid);
1559         add_credits(tcon->ses->server, credits_received, 0);
1560 }
1561
1562 /* smb2_async_writev - send an async write, and set up mid to handle result */
1563 int
1564 smb2_async_writev(struct cifs_writedata *wdata)
1565 {
1566         int rc = -EACCES;
1567         struct smb2_write_req *req = NULL;
1568         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1569         struct kvec iov;
1570         struct smb_rqst rqst;
1571
1572         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1573         if (rc)
1574                 goto async_writev_out;
1575
1576         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1577
1578         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1579         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1580         req->WriteChannelInfoOffset = 0;
1581         req->WriteChannelInfoLength = 0;
1582         req->Channel = 0;
1583         req->Offset = cpu_to_le64(wdata->offset);
1584         /* 4 for rfc1002 length field */
1585         req->DataOffset = cpu_to_le16(
1586                                 offsetof(struct smb2_write_req, Buffer) - 4);
1587         req->RemainingBytes = 0;
1588
1589         /* 4 for rfc1002 length field and 1 for Buffer */
1590         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1591         iov.iov_base = req;
1592
1593         rqst.rq_iov = &iov;
1594         rqst.rq_nvec = 1;
1595         rqst.rq_pages = wdata->pages;
1596         rqst.rq_npages = wdata->nr_pages;
1597         rqst.rq_pagesz = wdata->pagesz;
1598         rqst.rq_tailsz = wdata->tailsz;
1599
1600         cFYI(1, "async write at %llu %u bytes", wdata->offset, wdata->bytes);
1601
1602         req->Length = cpu_to_le32(wdata->bytes);
1603
1604         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1605
1606         kref_get(&wdata->refcount);
1607         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1608                                 smb2_writev_callback, wdata, 0);
1609
1610         if (rc) {
1611                 kref_put(&wdata->refcount, cifs_writedata_release);
1612                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1613         }
1614
1615 async_writev_out:
1616         cifs_small_buf_release(req);
1617         return rc;
1618 }
1619
1620 /*
1621  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1622  * The length field from io_parms must be at least 1 and indicates a number of
1623  * elements with data to write that begins with position 1 in iov array. All
1624  * data length is specified by count.
1625  */
1626 int
1627 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1628            unsigned int *nbytes, struct kvec *iov, int n_vec)
1629 {
1630         int rc = 0;
1631         struct smb2_write_req *req = NULL;
1632         struct smb2_write_rsp *rsp = NULL;
1633         int resp_buftype;
1634         *nbytes = 0;
1635
1636         if (n_vec < 1)
1637                 return rc;
1638
1639         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1640         if (rc)
1641                 return rc;
1642
1643         if (io_parms->tcon->ses->server == NULL)
1644                 return -ECONNABORTED;
1645
1646         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1647
1648         req->PersistentFileId = io_parms->persistent_fid;
1649         req->VolatileFileId = io_parms->volatile_fid;
1650         req->WriteChannelInfoOffset = 0;
1651         req->WriteChannelInfoLength = 0;
1652         req->Channel = 0;
1653         req->Length = cpu_to_le32(io_parms->length);
1654         req->Offset = cpu_to_le64(io_parms->offset);
1655         /* 4 for rfc1002 length field */
1656         req->DataOffset = cpu_to_le16(
1657                                 offsetof(struct smb2_write_req, Buffer) - 4);
1658         req->RemainingBytes = 0;
1659
1660         iov[0].iov_base = (char *)req;
1661         /* 4 for rfc1002 length field and 1 for Buffer */
1662         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1663
1664         /* length of entire message including data to be written */
1665         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1666
1667         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1668                           &resp_buftype, 0);
1669         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1670
1671         if (rc) {
1672                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1673                 cERROR(1, "Send error in write = %d", rc);
1674         } else
1675                 *nbytes = le32_to_cpu(rsp->DataLength);
1676
1677         free_rsp_buf(resp_buftype, rsp);
1678         return rc;
1679 }
1680
1681 static unsigned int
1682 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1683 {
1684         int len;
1685         unsigned int entrycount = 0;
1686         unsigned int next_offset = 0;
1687         FILE_DIRECTORY_INFO *entryptr;
1688
1689         if (bufstart == NULL)
1690                 return 0;
1691
1692         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1693
1694         while (1) {
1695                 entryptr = (FILE_DIRECTORY_INFO *)
1696                                         ((char *)entryptr + next_offset);
1697
1698                 if ((char *)entryptr + size > end_of_buf) {
1699                         cERROR(1, "malformed search entry would overflow");
1700                         break;
1701                 }
1702
1703                 len = le32_to_cpu(entryptr->FileNameLength);
1704                 if ((char *)entryptr + len + size > end_of_buf) {
1705                         cERROR(1, "directory entry name would overflow frame "
1706                                   "end of buf %p", end_of_buf);
1707                         break;
1708                 }
1709
1710                 *lastentry = (char *)entryptr;
1711                 entrycount++;
1712
1713                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1714                 if (!next_offset)
1715                         break;
1716         }
1717
1718         return entrycount;
1719 }
1720
1721 /*
1722  * Readdir/FindFirst
1723  */
1724 int
1725 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1726                      u64 persistent_fid, u64 volatile_fid, int index,
1727                      struct cifs_search_info *srch_inf)
1728 {
1729         struct smb2_query_directory_req *req;
1730         struct smb2_query_directory_rsp *rsp = NULL;
1731         struct kvec iov[2];
1732         int rc = 0;
1733         int len;
1734         int resp_buftype;
1735         unsigned char *bufptr;
1736         struct TCP_Server_Info *server;
1737         struct cifs_ses *ses = tcon->ses;
1738         __le16 asteriks = cpu_to_le16('*');
1739         char *end_of_smb;
1740         unsigned int output_size = CIFSMaxBufSize;
1741         size_t info_buf_size;
1742
1743         if (ses && (ses->server))
1744                 server = ses->server;
1745         else
1746                 return -EIO;
1747
1748         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1749         if (rc)
1750                 return rc;
1751
1752         switch (srch_inf->info_level) {
1753         case SMB_FIND_FILE_DIRECTORY_INFO:
1754                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1755                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1756                 break;
1757         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1758                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1759                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1760                 break;
1761         default:
1762                 cERROR(1, "info level %u isn't supported",
1763                        srch_inf->info_level);
1764                 rc = -EINVAL;
1765                 goto qdir_exit;
1766         }
1767
1768         req->FileIndex = cpu_to_le32(index);
1769         req->PersistentFileId = persistent_fid;
1770         req->VolatileFileId = volatile_fid;
1771
1772         len = 0x2;
1773         bufptr = req->Buffer;
1774         memcpy(bufptr, &asteriks, len);
1775
1776         req->FileNameOffset =
1777                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
1778         req->FileNameLength = cpu_to_le16(len);
1779         /*
1780          * BB could be 30 bytes or so longer if we used SMB2 specific
1781          * buffer lengths, but this is safe and close enough.
1782          */
1783         output_size = min_t(unsigned int, output_size, server->maxBuf);
1784         output_size = min_t(unsigned int, output_size, 2 << 15);
1785         req->OutputBufferLength = cpu_to_le32(output_size);
1786
1787         iov[0].iov_base = (char *)req;
1788         /* 4 for RFC1001 length and 1 for Buffer */
1789         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1790
1791         iov[1].iov_base = (char *)(req->Buffer);
1792         iov[1].iov_len = len;
1793
1794         inc_rfc1001_len(req, len - 1 /* Buffer */);
1795
1796         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
1797         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
1798
1799         if (rc) {
1800                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
1801                 goto qdir_exit;
1802         }
1803
1804         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
1805                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
1806                           info_buf_size);
1807         if (rc)
1808                 goto qdir_exit;
1809
1810         srch_inf->unicode = true;
1811
1812         if (srch_inf->ntwrk_buf_start) {
1813                 if (srch_inf->smallBuf)
1814                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
1815                 else
1816                         cifs_buf_release(srch_inf->ntwrk_buf_start);
1817         }
1818         srch_inf->ntwrk_buf_start = (char *)rsp;
1819         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
1820                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
1821         /* 4 for rfc1002 length field */
1822         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
1823         srch_inf->entries_in_buffer =
1824                         num_entries(srch_inf->srch_entries_start, end_of_smb,
1825                                     &srch_inf->last_entry, info_buf_size);
1826         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
1827         cFYI(1, "num entries %d last_index %lld srch start %p srch end %p",
1828                 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
1829                 srch_inf->srch_entries_start, srch_inf->last_entry);
1830         if (resp_buftype == CIFS_LARGE_BUFFER)
1831                 srch_inf->smallBuf = false;
1832         else if (resp_buftype == CIFS_SMALL_BUFFER)
1833                 srch_inf->smallBuf = true;
1834         else
1835                 cERROR(1, "illegal search buffer type");
1836
1837         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
1838                 srch_inf->endOfSearch = 1;
1839         else
1840                 srch_inf->endOfSearch = 0;
1841
1842         return rc;
1843
1844 qdir_exit:
1845         free_rsp_buf(resp_buftype, rsp);
1846         return rc;
1847 }
1848
1849 static int
1850 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
1851                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
1852                unsigned int num, void **data, unsigned int *size)
1853 {
1854         struct smb2_set_info_req *req;
1855         struct smb2_set_info_rsp *rsp = NULL;
1856         struct kvec *iov;
1857         int rc = 0;
1858         int resp_buftype;
1859         unsigned int i;
1860         struct TCP_Server_Info *server;
1861         struct cifs_ses *ses = tcon->ses;
1862
1863         if (ses && (ses->server))
1864                 server = ses->server;
1865         else
1866                 return -EIO;
1867
1868         if (!num)
1869                 return -EINVAL;
1870
1871         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
1872         if (!iov)
1873                 return -ENOMEM;
1874
1875         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
1876         if (rc) {
1877                 kfree(iov);
1878                 return rc;
1879         }
1880
1881         req->hdr.ProcessId = cpu_to_le32(pid);
1882
1883         req->InfoType = SMB2_O_INFO_FILE;
1884         req->FileInfoClass = info_class;
1885         req->PersistentFileId = persistent_fid;
1886         req->VolatileFileId = volatile_fid;
1887
1888         /* 4 for RFC1001 length and 1 for Buffer */
1889         req->BufferOffset =
1890                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
1891         req->BufferLength = cpu_to_le32(*size);
1892
1893         inc_rfc1001_len(req, *size - 1 /* Buffer */);
1894
1895         memcpy(req->Buffer, *data, *size);
1896
1897         iov[0].iov_base = (char *)req;
1898         /* 4 for RFC1001 length */
1899         iov[0].iov_len = get_rfc1002_length(req) + 4;
1900
1901         for (i = 1; i < num; i++) {
1902                 inc_rfc1001_len(req, size[i]);
1903                 le32_add_cpu(&req->BufferLength, size[i]);
1904                 iov[i].iov_base = (char *)data[i];
1905                 iov[i].iov_len = size[i];
1906         }
1907
1908         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
1909         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
1910
1911         if (rc != 0) {
1912                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
1913                 goto out;
1914         }
1915 out:
1916         free_rsp_buf(resp_buftype, rsp);
1917         kfree(iov);
1918         return rc;
1919 }
1920
1921 int
1922 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
1923             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
1924 {
1925         struct smb2_file_rename_info info;
1926         void **data;
1927         unsigned int size[2];
1928         int rc;
1929         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
1930
1931         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
1932         if (!data)
1933                 return -ENOMEM;
1934
1935         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
1936                               /* 0 = fail if target already exists */
1937         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
1938         info.FileNameLength = cpu_to_le32(len);
1939
1940         data[0] = &info;
1941         size[0] = sizeof(struct smb2_file_rename_info);
1942
1943         data[1] = target_file;
1944         size[1] = len + 2 /* null */;
1945
1946         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
1947                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
1948                            size);
1949         kfree(data);
1950         return rc;
1951 }
1952
1953 int
1954 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
1955                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
1956 {
1957         struct smb2_file_link_info info;
1958         void **data;
1959         unsigned int size[2];
1960         int rc;
1961         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
1962
1963         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
1964         if (!data)
1965                 return -ENOMEM;
1966
1967         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
1968                               /* 0 = fail if link already exists */
1969         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
1970         info.FileNameLength = cpu_to_le32(len);
1971
1972         data[0] = &info;
1973         size[0] = sizeof(struct smb2_file_link_info);
1974
1975         data[1] = target_file;
1976         size[1] = len + 2 /* null */;
1977
1978         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
1979                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
1980         kfree(data);
1981         return rc;
1982 }
1983
1984 int
1985 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1986              u64 volatile_fid, u32 pid, __le64 *eof)
1987 {
1988         struct smb2_file_eof_info info;
1989         void *data;
1990         unsigned int size;
1991
1992         info.EndOfFile = *eof;
1993
1994         data = &info;
1995         size = sizeof(struct smb2_file_eof_info);
1996
1997         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
1998                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
1999 }
2000
2001 int
2002 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2003               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2004 {
2005         unsigned int size;
2006         size = sizeof(FILE_BASIC_INFO);
2007         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2008                              current->tgid, FILE_BASIC_INFORMATION, 1,
2009                              (void **)&buf, &size);
2010 }
2011
2012 int
2013 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2014                   const u64 persistent_fid, const u64 volatile_fid,
2015                   __u8 oplock_level)
2016 {
2017         int rc;
2018         struct smb2_oplock_break *req = NULL;
2019
2020         cFYI(1, "SMB2_oplock_break");
2021         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2022
2023         if (rc)
2024                 return rc;
2025
2026         req->VolatileFid = volatile_fid;
2027         req->PersistentFid = persistent_fid;
2028         req->OplockLevel = oplock_level;
2029         req->hdr.CreditRequest = cpu_to_le16(1);
2030
2031         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2032         /* SMB2 buffer freed by function above */
2033
2034         if (rc) {
2035                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2036                 cFYI(1, "Send error in Oplock Break = %d", rc);
2037         }
2038
2039         return rc;
2040 }
2041
2042 static void
2043 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2044                         struct kstatfs *kst)
2045 {
2046         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2047                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2048         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2049         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2050         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2051         return;
2052 }
2053
2054 static int
2055 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2056                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2057 {
2058         int rc;
2059         struct smb2_query_info_req *req;
2060
2061         cFYI(1, "Query FSInfo level %d", level);
2062
2063         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2064                 return -EIO;
2065
2066         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2067         if (rc)
2068                 return rc;
2069
2070         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2071         req->FileInfoClass = level;
2072         req->PersistentFileId = persistent_fid;
2073         req->VolatileFileId = volatile_fid;
2074         /* 4 for rfc1002 length field and 1 for pad */
2075         req->InputBufferOffset =
2076                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2077         req->OutputBufferLength = cpu_to_le32(
2078                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2079
2080         iov->iov_base = (char *)req;
2081         /* 4 for rfc1002 length field */
2082         iov->iov_len = get_rfc1002_length(req) + 4;
2083         return 0;
2084 }
2085
2086 int
2087 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2088               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2089 {
2090         struct smb2_query_info_rsp *rsp = NULL;
2091         struct kvec iov;
2092         int rc = 0;
2093         int resp_buftype;
2094         struct cifs_ses *ses = tcon->ses;
2095         struct smb2_fs_full_size_info *info = NULL;
2096
2097         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2098                                 sizeof(struct smb2_fs_full_size_info),
2099                                 persistent_fid, volatile_fid);
2100         if (rc)
2101                 return rc;
2102
2103         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2104         if (rc) {
2105                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2106                 goto qinf_exit;
2107         }
2108         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2109
2110         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2111                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2112         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2113                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2114                           sizeof(struct smb2_fs_full_size_info));
2115         if (!rc)
2116                 copy_fs_info_to_kstatfs(info, fsdata);
2117
2118 qinf_exit:
2119         free_rsp_buf(resp_buftype, iov.iov_base);
2120         return rc;
2121 }
2122
2123 int
2124 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2125            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2126            const __u32 num_lock, struct smb2_lock_element *buf)
2127 {
2128         int rc = 0;
2129         struct smb2_lock_req *req = NULL;
2130         struct kvec iov[2];
2131         int resp_buf_type;
2132         unsigned int count;
2133
2134         cFYI(1, "smb2_lockv num lock %d", num_lock);
2135
2136         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2137         if (rc)
2138                 return rc;
2139
2140         req->hdr.ProcessId = cpu_to_le32(pid);
2141         req->LockCount = cpu_to_le16(num_lock);
2142
2143         req->PersistentFileId = persist_fid;
2144         req->VolatileFileId = volatile_fid;
2145
2146         count = num_lock * sizeof(struct smb2_lock_element);
2147         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2148
2149         iov[0].iov_base = (char *)req;
2150         /* 4 for rfc1002 length field and count for all locks */
2151         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2152         iov[1].iov_base = (char *)buf;
2153         iov[1].iov_len = count;
2154
2155         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2156         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2157         if (rc) {
2158                 cFYI(1, "Send error in smb2_lockv = %d", rc);
2159                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2160         }
2161
2162         return rc;
2163 }
2164
2165 int
2166 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2167           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2168           const __u64 length, const __u64 offset, const __u32 lock_flags,
2169           const bool wait)
2170 {
2171         struct smb2_lock_element lock;
2172
2173         lock.Offset = cpu_to_le64(offset);
2174         lock.Length = cpu_to_le64(length);
2175         lock.Flags = cpu_to_le32(lock_flags);
2176         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2177                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2178
2179         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2180 }
2181
2182 int
2183 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2184                  __u8 *lease_key, const __le32 lease_state)
2185 {
2186         int rc;
2187         struct smb2_lease_ack *req = NULL;
2188
2189         cFYI(1, "SMB2_lease_break");
2190         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2191
2192         if (rc)
2193                 return rc;
2194
2195         req->hdr.CreditRequest = cpu_to_le16(1);
2196         req->StructureSize = cpu_to_le16(36);
2197         inc_rfc1001_len(req, 12);
2198
2199         memcpy(req->LeaseKey, lease_key, 16);
2200         req->LeaseState = lease_state;
2201
2202         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2203         /* SMB2 buffer freed by function above */
2204
2205         if (rc) {
2206                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2207                 cFYI(1, "Send error in Lease Break = %d", rc);
2208         }
2209
2210         return rc;
2211 }