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