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 = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
 850         if (!buf)
 851                 return NULL;
 852
 853         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
 854         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
 855         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
 856                 buf->lcontext.LeaseState = SMB2_LEASE_WRITE_CACHING |
 857                                            SMB2_LEASE_READ_CACHING;
 858         else if (oplock == SMB2_OPLOCK_LEVEL_II)
 859                 buf->lcontext.LeaseState = SMB2_LEASE_READ_CACHING;
 860         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
 861                 buf->lcontext.LeaseState = SMB2_LEASE_HANDLE_CACHING |
 862                                            SMB2_LEASE_READ_CACHING |
 863                                            SMB2_LEASE_WRITE_CACHING;
 864
 865         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 866                                         (struct create_lease, lcontext));
 867         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
 868         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 869                                 (struct create_lease, Name));
 870         buf->ccontext.NameLength = cpu_to_le16(4);
 871         buf->Name[0] = 'R';
 872         buf->Name[1] = 'q';
 873         buf->Name[2] = 'L';
 874         buf->Name[3] = 's';
 875         return buf;
 876 }
 877
 878 static __u8
 879 parse_lease_state(struct smb2_create_rsp *rsp)
 880 {
 881         char *data_offset;
 882         struct create_lease *lc;
 883         bool found = false;
 884
 885         data_offset = (char *)rsp;
 886         data_offset += 4 + le32_to_cpu(rsp->CreateContextsOffset);
 887         lc = (struct create_lease *)data_offset;
 888         do {
 889                 char *name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;
 890                 if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||
 891                     strncmp(name, "RqLs", 4)) {
 892                         lc = (struct create_lease *)((char *)lc
 893                                         + le32_to_cpu(lc->ccontext.Next));
 894                         continue;
 895                 }
 896                 if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
 897                         return SMB2_OPLOCK_LEVEL_NOCHANGE;
 898                 found = true;
 899                 break;
 900         } while (le32_to_cpu(lc->ccontext.Next) != 0);
 901
 902         if (!found)
 903                 return 0;
 904
 905         return smb2_map_lease_to_oplock(lc->lcontext.LeaseState);
 906 }
 907
 908 int
 909 SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
 910           u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
 911           __u32 create_disposition, __u32 file_attributes, __u32 create_options,
 912           __u8 *oplock, struct smb2_file_all_info *buf)
 913 {
 914         struct smb2_create_req *req;
 915         struct smb2_create_rsp *rsp;
 916         struct TCP_Server_Info *server;
 917         struct cifs_ses *ses = tcon->ses;
 918         struct kvec iov[3];
 919         int resp_buftype;
 920         int uni_path_len;
 921         __le16 *copy_path = NULL;
 922         int copy_size;
 923         int rc = 0;
 924         int num_iovecs = 2;
 925
 926         cFYI(1, "create/open");
 927
 928         if (ses && (ses->server))
 929                 server = ses->server;
 930         else
 931                 return -EIO;
 932
 933         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
 934         if (rc)
 935                 return rc;
 936
 937         req->ImpersonationLevel = IL_IMPERSONATION;
 938         req->DesiredAccess = cpu_to_le32(desired_access);
 939         /* File attributes ignored on open (used in create though) */
 940         req->FileAttributes = cpu_to_le32(file_attributes);
 941         req->ShareAccess = FILE_SHARE_ALL_LE;
 942         req->CreateDisposition = cpu_to_le32(create_disposition);
 943         req->CreateOptions = cpu_to_le32(create_options);
 944         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
 945         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)
 946                         - 8 /* pad */ - 4 /* do not count rfc1001 len field */);
 947
 948         iov[0].iov_base = (char *)req;
 949         /* 4 for rfc1002 length field */
 950         iov[0].iov_len = get_rfc1002_length(req) + 4;
 951
 952         /* MUST set path len (NameLength) to 0 opening root of share */
 953         if (uni_path_len >= 4) {
 954                 req->NameLength = cpu_to_le16(uni_path_len - 2);
 955                 /* -1 since last byte is buf[0] which is sent below (path) */
 956                 iov[0].iov_len--;
 957                 if (uni_path_len % 8 != 0) {
 958                         copy_size = uni_path_len / 8 * 8;
 959                         if (copy_size < uni_path_len)
 960                                 copy_size += 8;
 961
 962                         copy_path = kzalloc(copy_size, GFP_KERNEL);
 963                         if (!copy_path)
 964                                 return -ENOMEM;
 965                         memcpy((char *)copy_path, (const char *)path,
 966                                 uni_path_len);
 967                         uni_path_len = copy_size;
 968                         path = copy_path;
 969                 }
 970
 971                 iov[1].iov_len = uni_path_len;
 972                 iov[1].iov_base = path;
 973                 /*
 974                  * -1 since last byte is buf[0] which was counted in
 975                  * smb2_buf_len.
 976                  */
 977                 inc_rfc1001_len(req, uni_path_len - 1);
 978         } else {
 979                 iov[0].iov_len += 7;
 980                 req->hdr.smb2_buf_length = cpu_to_be32(be32_to_cpu(
 981                                 req->hdr.smb2_buf_length) + 8 - 1);
 982                 num_iovecs = 1;
 983                 req->NameLength = 0;
 984         }
 985
 986         if (!server->oplocks)
 987                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
 988
 989         if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
 990             *oplock == SMB2_OPLOCK_LEVEL_NONE)
 991                 req->RequestedOplockLevel = *oplock;
 992         else {
 993                 iov[num_iovecs].iov_base = create_lease_buf(oplock+1, *oplock);
 994                 if (iov[num_iovecs].iov_base == NULL) {
 995                         cifs_small_buf_release(req);
 996                         kfree(copy_path);
 997                         return -ENOMEM;
 998                 }
 999                 iov[num_iovecs].iov_len = sizeof(struct create_lease);
1000                 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1001                 req->CreateContextsOffset = cpu_to_le32(
1002                         sizeof(struct smb2_create_req) - 4 - 8 +
1003                         iov[num_iovecs-1].iov_len);
1004                 req->CreateContextsLength = cpu_to_le32(
1005                         sizeof(struct create_lease));
1006                 inc_rfc1001_len(&req->hdr, sizeof(struct create_lease));
1007                 num_iovecs++;
1008         }
1009
1010         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1011         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1012
1013         if (rc != 0) {
1014                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1015                 goto creat_exit;
1016         }
1017
1018         *persistent_fid = rsp->PersistentFileId;
1019         *volatile_fid = rsp->VolatileFileId;
1020
1021         if (buf) {
1022                 memcpy(buf, &rsp->CreationTime, 32);
1023                 buf->AllocationSize = rsp->AllocationSize;
1024                 buf->EndOfFile = rsp->EndofFile;
1025                 buf->Attributes = rsp->FileAttributes;
1026                 buf->NumberOfLinks = cpu_to_le32(1);
1027                 buf->DeletePending = 0;
1028         }
1029
1030         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1031                 *oplock = parse_lease_state(rsp);
1032         else
1033                 *oplock = rsp->OplockLevel;
1034 creat_exit:
1035         kfree(copy_path);
1036         free_rsp_buf(resp_buftype, rsp);
1037         return rc;
1038 }
1039
1040 int
1041 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1042            u64 persistent_fid, u64 volatile_fid)
1043 {
1044         struct smb2_close_req *req;
1045         struct smb2_close_rsp *rsp;
1046         struct TCP_Server_Info *server;
1047         struct cifs_ses *ses = tcon->ses;
1048         struct kvec iov[1];
1049         int resp_buftype;
1050         int rc = 0;
1051
1052         cFYI(1, "Close");
1053
1054         if (ses && (ses->server))
1055                 server = ses->server;
1056         else
1057                 return -EIO;
1058
1059         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1060         if (rc)
1061                 return rc;
1062
1063         req->PersistentFileId = persistent_fid;
1064         req->VolatileFileId = volatile_fid;
1065
1066         iov[0].iov_base = (char *)req;
1067         /* 4 for rfc1002 length field */
1068         iov[0].iov_len = get_rfc1002_length(req) + 4;
1069
1070         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1071         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1072
1073         if (rc != 0) {
1074                 if (tcon)
1075                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1076                 goto close_exit;
1077         }
1078
1079         /* BB FIXME - decode close response, update inode for caching */
1080
1081 close_exit:
1082         free_rsp_buf(resp_buftype, rsp);
1083         return rc;
1084 }
1085
1086 static int
1087 validate_buf(unsigned int offset, unsigned int buffer_length,
1088              struct smb2_hdr *hdr, unsigned int min_buf_size)
1089
1090 {
1091         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1092         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1093         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1094         char *end_of_buf = begin_of_buf + buffer_length;
1095
1096
1097         if (buffer_length < min_buf_size) {
1098                 cERROR(1, "buffer length %d smaller than minimum size %d",
1099                            buffer_length, min_buf_size);
1100                 return -EINVAL;
1101         }
1102
1103         /* check if beyond RFC1001 maximum length */
1104         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1105                 cERROR(1, "buffer length %d or smb length %d too large",
1106                            buffer_length, smb_len);
1107                 return -EINVAL;
1108         }
1109
1110         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1111                 cERROR(1, "illegal server response, bad offset to data");
1112                 return -EINVAL;
1113         }
1114
1115         return 0;
1116 }
1117
1118 /*
1119  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1120  * Caller must free buffer.
1121  */
1122 static int
1123 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1124                       struct smb2_hdr *hdr, unsigned int minbufsize,
1125                       char *data)
1126
1127 {
1128         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1129         int rc;
1130
1131         if (!data)
1132                 return -EINVAL;
1133
1134         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1135         if (rc)
1136                 return rc;
1137
1138         memcpy(data, begin_of_buf, buffer_length);
1139
1140         return 0;
1141 }
1142
1143 static int
1144 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1145            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1146            size_t output_len, size_t min_len, void *data)
1147 {
1148         struct smb2_query_info_req *req;
1149         struct smb2_query_info_rsp *rsp = NULL;
1150         struct kvec iov[2];
1151         int rc = 0;
1152         int resp_buftype;
1153         struct TCP_Server_Info *server;
1154         struct cifs_ses *ses = tcon->ses;
1155
1156         cFYI(1, "Query Info");
1157
1158         if (ses && (ses->server))
1159                 server = ses->server;
1160         else
1161                 return -EIO;
1162
1163         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1164         if (rc)
1165                 return rc;
1166
1167         req->InfoType = SMB2_O_INFO_FILE;
1168         req->FileInfoClass = info_class;
1169         req->PersistentFileId = persistent_fid;
1170         req->VolatileFileId = volatile_fid;
1171         /* 4 for rfc1002 length field and 1 for Buffer */
1172         req->InputBufferOffset =
1173                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1174         req->OutputBufferLength = cpu_to_le32(output_len);
1175
1176         iov[0].iov_base = (char *)req;
1177         /* 4 for rfc1002 length field */
1178         iov[0].iov_len = get_rfc1002_length(req) + 4;
1179
1180         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1181         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1182
1183         if (rc) {
1184                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1185                 goto qinf_exit;
1186         }
1187
1188         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1189                                    le32_to_cpu(rsp->OutputBufferLength),
1190                                    &rsp->hdr, min_len, data);
1191
1192 qinf_exit:
1193         free_rsp_buf(resp_buftype, rsp);
1194         return rc;
1195 }
1196
1197 int
1198 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1199                 u64 persistent_fid, u64 volatile_fid,
1200                 struct smb2_file_all_info *data)
1201 {
1202         return query_info(xid, tcon, persistent_fid, volatile_fid,
1203                           FILE_ALL_INFORMATION,
1204                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1205                           sizeof(struct smb2_file_all_info), data);
1206 }
1207
1208 int
1209 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1210                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1211 {
1212         return query_info(xid, tcon, persistent_fid, volatile_fid,
1213                           FILE_INTERNAL_INFORMATION,
1214                           sizeof(struct smb2_file_internal_info),
1215                           sizeof(struct smb2_file_internal_info), uniqueid);
1216 }
1217
1218 /*
1219  * This is a no-op for now. We're not really interested in the reply, but
1220  * rather in the fact that the server sent one and that server->lstrp
1221  * gets updated.
1222  *
1223  * FIXME: maybe we should consider checking that the reply matches request?
1224  */
1225 static void
1226 smb2_echo_callback(struct mid_q_entry *mid)
1227 {
1228         struct TCP_Server_Info *server = mid->callback_data;
1229         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1230         unsigned int credits_received = 1;
1231
1232         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1233                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1234
1235         DeleteMidQEntry(mid);
1236         add_credits(server, credits_received, CIFS_ECHO_OP);
1237 }
1238
1239 int
1240 SMB2_echo(struct TCP_Server_Info *server)
1241 {
1242         struct smb2_echo_req *req;
1243         int rc = 0;
1244         struct kvec iov;
1245         struct smb_rqst rqst = { .rq_iov = &iov,
1246                                  .rq_nvec = 1 };
1247
1248         cFYI(1, "In echo request");
1249
1250         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1251         if (rc)
1252                 return rc;
1253
1254         req->hdr.CreditRequest = cpu_to_le16(1);
1255
1256         iov.iov_base = (char *)req;
1257         /* 4 for rfc1002 length field */
1258         iov.iov_len = get_rfc1002_length(req) + 4;
1259
1260         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1261                              CIFS_ECHO_OP);
1262         if (rc)
1263                 cFYI(1, "Echo request failed: %d", rc);
1264
1265         cifs_small_buf_release(req);
1266         return rc;
1267 }
1268
1269 int
1270 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1271            u64 volatile_fid)
1272 {
1273         struct smb2_flush_req *req;
1274         struct TCP_Server_Info *server;
1275         struct cifs_ses *ses = tcon->ses;
1276         struct kvec iov[1];
1277         int resp_buftype;
1278         int rc = 0;
1279
1280         cFYI(1, "Flush");
1281
1282         if (ses && (ses->server))
1283                 server = ses->server;
1284         else
1285                 return -EIO;
1286
1287         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1288         if (rc)
1289                 return rc;
1290
1291         req->PersistentFileId = persistent_fid;
1292         req->VolatileFileId = volatile_fid;
1293
1294         iov[0].iov_base = (char *)req;
1295         /* 4 for rfc1002 length field */
1296         iov[0].iov_len = get_rfc1002_length(req) + 4;
1297
1298         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1299
1300         if ((rc != 0) && tcon)
1301                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1302
1303         free_rsp_buf(resp_buftype, iov[0].iov_base);
1304         return rc;
1305 }
1306
1307 /*
1308  * To form a chain of read requests, any read requests after the first should
1309  * have the end_of_chain boolean set to true.
1310  */
1311 static int
1312 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1313                   unsigned int remaining_bytes, int request_type)
1314 {
1315         int rc = -EACCES;
1316         struct smb2_read_req *req = NULL;
1317
1318         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1319         if (rc)
1320                 return rc;
1321         if (io_parms->tcon->ses->server == NULL)
1322                 return -ECONNABORTED;
1323
1324         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1325
1326         req->PersistentFileId = io_parms->persistent_fid;
1327         req->VolatileFileId = io_parms->volatile_fid;
1328         req->ReadChannelInfoOffset = 0; /* reserved */
1329         req->ReadChannelInfoLength = 0; /* reserved */
1330         req->Channel = 0; /* reserved */
1331         req->MinimumCount = 0;
1332         req->Length = cpu_to_le32(io_parms->length);
1333         req->Offset = cpu_to_le64(io_parms->offset);
1334
1335         if (request_type & CHAINED_REQUEST) {
1336                 if (!(request_type & END_OF_CHAIN)) {
1337                         /* 4 for rfc1002 length field */
1338                         req->hdr.NextCommand =
1339                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1340                 } else /* END_OF_CHAIN */
1341                         req->hdr.NextCommand = 0;
1342                 if (request_type & RELATED_REQUEST) {
1343                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1344                         /*
1345                          * Related requests use info from previous read request
1346                          * in chain.
1347                          */
1348                         req->hdr.SessionId = 0xFFFFFFFF;
1349                         req->hdr.TreeId = 0xFFFFFFFF;
1350                         req->PersistentFileId = 0xFFFFFFFF;
1351                         req->VolatileFileId = 0xFFFFFFFF;
1352                 }
1353         }
1354         if (remaining_bytes > io_parms->length)
1355                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1356         else
1357                 req->RemainingBytes = 0;
1358
1359         iov[0].iov_base = (char *)req;
1360         /* 4 for rfc1002 length field */
1361         iov[0].iov_len = get_rfc1002_length(req) + 4;
1362         return rc;
1363 }
1364
1365 static void
1366 smb2_readv_callback(struct mid_q_entry *mid)
1367 {
1368         struct cifs_readdata *rdata = mid->callback_data;
1369         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1370         struct TCP_Server_Info *server = tcon->ses->server;
1371         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1372         unsigned int credits_received = 1;
1373         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1374                                  .rq_nvec = 1,
1375                                  .rq_pages = rdata->pages,
1376                                  .rq_npages = rdata->nr_pages,
1377                                  .rq_pagesz = rdata->pagesz,
1378                                  .rq_tailsz = rdata->tailsz };
1379
1380         cFYI(1, "%s: mid=%llu state=%d result=%d bytes=%u", __func__,
1381                 mid->mid, mid->mid_state, rdata->result, 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                                 cERROR(1, "SMB signature verification returned "
1394                                        "error = %d", 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         cFYI(1, "%s: offset=%llu bytes=%u", __func__,
1428                 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                 cERROR(1, "Send error in read = %d", rc);
1483         } else {
1484                 *nbytes = le32_to_cpu(rsp->DataLength);
1485                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1486                     (*nbytes > io_parms->length)) {
1487                         cFYI(1, "bad length %d for count %d", *nbytes,
1488                                 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         cFYI(1, "async write at %llu %u bytes", wdata->offset, wdata->bytes);
1599
1600         req->Length = cpu_to_le32(wdata->bytes);
1601
1602         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1603
1604         kref_get(&wdata->refcount);
1605         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1606                                 smb2_writev_callback, wdata, 0);
1607
1608         if (rc) {
1609                 kref_put(&wdata->refcount, cifs_writedata_release);
1610                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1611         }
1612
1613 async_writev_out:
1614         cifs_small_buf_release(req);
1615         return rc;
1616 }
1617
1618 /*
1619  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1620  * The length field from io_parms must be at least 1 and indicates a number of
1621  * elements with data to write that begins with position 1 in iov array. All
1622  * data length is specified by count.
1623  */
1624 int
1625 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1626            unsigned int *nbytes, struct kvec *iov, int n_vec)
1627 {
1628         int rc = 0;
1629         struct smb2_write_req *req = NULL;
1630         struct smb2_write_rsp *rsp = NULL;
1631         int resp_buftype;
1632         *nbytes = 0;
1633
1634         if (n_vec < 1)
1635                 return rc;
1636
1637         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1638         if (rc)
1639                 return rc;
1640
1641         if (io_parms->tcon->ses->server == NULL)
1642                 return -ECONNABORTED;
1643
1644         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1645
1646         req->PersistentFileId = io_parms->persistent_fid;
1647         req->VolatileFileId = io_parms->volatile_fid;
1648         req->WriteChannelInfoOffset = 0;
1649         req->WriteChannelInfoLength = 0;
1650         req->Channel = 0;
1651         req->Length = cpu_to_le32(io_parms->length);
1652         req->Offset = cpu_to_le64(io_parms->offset);
1653         /* 4 for rfc1002 length field */
1654         req->DataOffset = cpu_to_le16(
1655                                 offsetof(struct smb2_write_req, Buffer) - 4);
1656         req->RemainingBytes = 0;
1657
1658         iov[0].iov_base = (char *)req;
1659         /* 4 for rfc1002 length field and 1 for Buffer */
1660         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1661
1662         /* length of entire message including data to be written */
1663         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1664
1665         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1666                           &resp_buftype, 0);
1667         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1668
1669         if (rc) {
1670                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1671                 cERROR(1, "Send error in write = %d", rc);
1672         } else
1673                 *nbytes = le32_to_cpu(rsp->DataLength);
1674
1675         free_rsp_buf(resp_buftype, rsp);
1676         return rc;
1677 }
1678
1679 static unsigned int
1680 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1681 {
1682         int len;
1683         unsigned int entrycount = 0;
1684         unsigned int next_offset = 0;
1685         FILE_DIRECTORY_INFO *entryptr;
1686
1687         if (bufstart == NULL)
1688                 return 0;
1689
1690         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1691
1692         while (1) {
1693                 entryptr = (FILE_DIRECTORY_INFO *)
1694                                         ((char *)entryptr + next_offset);
1695
1696                 if ((char *)entryptr + size > end_of_buf) {
1697                         cERROR(1, "malformed search entry would overflow");
1698                         break;
1699                 }
1700
1701                 len = le32_to_cpu(entryptr->FileNameLength);
1702                 if ((char *)entryptr + len + size > end_of_buf) {
1703                         cERROR(1, "directory entry name would overflow frame "
1704                                   "end of buf %p", end_of_buf);
1705                         break;
1706                 }
1707
1708                 *lastentry = (char *)entryptr;
1709                 entrycount++;
1710
1711                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1712                 if (!next_offset)
1713                         break;
1714         }
1715
1716         return entrycount;
1717 }
1718
1719 /*
1720  * Readdir/FindFirst
1721  */
1722 int
1723 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1724                      u64 persistent_fid, u64 volatile_fid, int index,
1725                      struct cifs_search_info *srch_inf)
1726 {
1727         struct smb2_query_directory_req *req;
1728         struct smb2_query_directory_rsp *rsp = NULL;
1729         struct kvec iov[2];
1730         int rc = 0;
1731         int len;
1732         int resp_buftype;
1733         unsigned char *bufptr;
1734         struct TCP_Server_Info *server;
1735         struct cifs_ses *ses = tcon->ses;
1736         __le16 asteriks = cpu_to_le16('*');
1737         char *end_of_smb;
1738         unsigned int output_size = CIFSMaxBufSize;
1739         size_t info_buf_size;
1740
1741         if (ses && (ses->server))
1742                 server = ses->server;
1743         else
1744                 return -EIO;
1745
1746         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1747         if (rc)
1748                 return rc;
1749
1750         switch (srch_inf->info_level) {
1751         case SMB_FIND_FILE_DIRECTORY_INFO:
1752                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1753                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1754                 break;
1755         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1756                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1757                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1758                 break;
1759         default:
1760                 cERROR(1, "info level %u isn't supported",
1761                        srch_inf->info_level);
1762                 rc = -EINVAL;
1763                 goto qdir_exit;
1764         }
1765
1766         req->FileIndex = cpu_to_le32(index);
1767         req->PersistentFileId = persistent_fid;
1768         req->VolatileFileId = volatile_fid;
1769
1770         len = 0x2;
1771         bufptr = req->Buffer;
1772         memcpy(bufptr, &asteriks, len);
1773
1774         req->FileNameOffset =
1775                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
1776         req->FileNameLength = cpu_to_le16(len);
1777         /*
1778          * BB could be 30 bytes or so longer if we used SMB2 specific
1779          * buffer lengths, but this is safe and close enough.
1780          */
1781         output_size = min_t(unsigned int, output_size, server->maxBuf);
1782         output_size = min_t(unsigned int, output_size, 2 << 15);
1783         req->OutputBufferLength = cpu_to_le32(output_size);
1784
1785         iov[0].iov_base = (char *)req;
1786         /* 4 for RFC1001 length and 1 for Buffer */
1787         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1788
1789         iov[1].iov_base = (char *)(req->Buffer);
1790         iov[1].iov_len = len;
1791
1792         inc_rfc1001_len(req, len - 1 /* Buffer */);
1793
1794         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
1795         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
1796
1797         if (rc) {
1798                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
1799                 goto qdir_exit;
1800         }
1801
1802         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
1803                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
1804                           info_buf_size);
1805         if (rc)
1806                 goto qdir_exit;
1807
1808         srch_inf->unicode = true;
1809
1810         if (srch_inf->ntwrk_buf_start) {
1811                 if (srch_inf->smallBuf)
1812                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
1813                 else
1814                         cifs_buf_release(srch_inf->ntwrk_buf_start);
1815         }
1816         srch_inf->ntwrk_buf_start = (char *)rsp;
1817         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
1818                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
1819         /* 4 for rfc1002 length field */
1820         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
1821         srch_inf->entries_in_buffer =
1822                         num_entries(srch_inf->srch_entries_start, end_of_smb,
1823                                     &srch_inf->last_entry, info_buf_size);
1824         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
1825         cFYI(1, "num entries %d last_index %lld srch start %p srch end %p",
1826                 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
1827                 srch_inf->srch_entries_start, srch_inf->last_entry);
1828         if (resp_buftype == CIFS_LARGE_BUFFER)
1829                 srch_inf->smallBuf = false;
1830         else if (resp_buftype == CIFS_SMALL_BUFFER)
1831                 srch_inf->smallBuf = true;
1832         else
1833                 cERROR(1, "illegal search buffer type");
1834
1835         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
1836                 srch_inf->endOfSearch = 1;
1837         else
1838                 srch_inf->endOfSearch = 0;
1839
1840         return rc;
1841
1842 qdir_exit:
1843         free_rsp_buf(resp_buftype, rsp);
1844         return rc;
1845 }
1846
1847 static int
1848 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
1849                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
1850                unsigned int num, void **data, unsigned int *size)
1851 {
1852         struct smb2_set_info_req *req;
1853         struct smb2_set_info_rsp *rsp = NULL;
1854         struct kvec *iov;
1855         int rc = 0;
1856         int resp_buftype;
1857         unsigned int i;
1858         struct TCP_Server_Info *server;
1859         struct cifs_ses *ses = tcon->ses;
1860
1861         if (ses && (ses->server))
1862                 server = ses->server;
1863         else
1864                 return -EIO;
1865
1866         if (!num)
1867                 return -EINVAL;
1868
1869         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
1870         if (!iov)
1871                 return -ENOMEM;
1872
1873         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
1874         if (rc) {
1875                 kfree(iov);
1876                 return rc;
1877         }
1878
1879         req->hdr.ProcessId = cpu_to_le32(pid);
1880
1881         req->InfoType = SMB2_O_INFO_FILE;
1882         req->FileInfoClass = info_class;
1883         req->PersistentFileId = persistent_fid;
1884         req->VolatileFileId = volatile_fid;
1885
1886         /* 4 for RFC1001 length and 1 for Buffer */
1887         req->BufferOffset =
1888                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
1889         req->BufferLength = cpu_to_le32(*size);
1890
1891         inc_rfc1001_len(req, *size - 1 /* Buffer */);
1892
1893         memcpy(req->Buffer, *data, *size);
1894
1895         iov[0].iov_base = (char *)req;
1896         /* 4 for RFC1001 length */
1897         iov[0].iov_len = get_rfc1002_length(req) + 4;
1898
1899         for (i = 1; i < num; i++) {
1900                 inc_rfc1001_len(req, size[i]);
1901                 le32_add_cpu(&req->BufferLength, size[i]);
1902                 iov[i].iov_base = (char *)data[i];
1903                 iov[i].iov_len = size[i];
1904         }
1905
1906         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
1907         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
1908
1909         if (rc != 0) {
1910                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
1911                 goto out;
1912         }
1913 out:
1914         free_rsp_buf(resp_buftype, rsp);
1915         kfree(iov);
1916         return rc;
1917 }
1918
1919 int
1920 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
1921             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
1922 {
1923         struct smb2_file_rename_info info;
1924         void **data;
1925         unsigned int size[2];
1926         int rc;
1927         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
1928
1929         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
1930         if (!data)
1931                 return -ENOMEM;
1932
1933         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
1934                               /* 0 = fail if target already exists */
1935         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
1936         info.FileNameLength = cpu_to_le32(len);
1937
1938         data[0] = &info;
1939         size[0] = sizeof(struct smb2_file_rename_info);
1940
1941         data[1] = target_file;
1942         size[1] = len + 2 /* null */;
1943
1944         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
1945                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
1946                            size);
1947         kfree(data);
1948         return rc;
1949 }
1950
1951 int
1952 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
1953                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
1954 {
1955         struct smb2_file_link_info info;
1956         void **data;
1957         unsigned int size[2];
1958         int rc;
1959         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
1960
1961         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
1962         if (!data)
1963                 return -ENOMEM;
1964
1965         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
1966                               /* 0 = fail if link already exists */
1967         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
1968         info.FileNameLength = cpu_to_le32(len);
1969
1970         data[0] = &info;
1971         size[0] = sizeof(struct smb2_file_link_info);
1972
1973         data[1] = target_file;
1974         size[1] = len + 2 /* null */;
1975
1976         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
1977                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
1978         kfree(data);
1979         return rc;
1980 }
1981
1982 int
1983 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1984              u64 volatile_fid, u32 pid, __le64 *eof)
1985 {
1986         struct smb2_file_eof_info info;
1987         void *data;
1988         unsigned int size;
1989
1990         info.EndOfFile = *eof;
1991
1992         data = &info;
1993         size = sizeof(struct smb2_file_eof_info);
1994
1995         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
1996                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
1997 }
1998
1999 int
2000 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2001               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2002 {
2003         unsigned int size;
2004         size = sizeof(FILE_BASIC_INFO);
2005         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2006                              current->tgid, FILE_BASIC_INFORMATION, 1,
2007                              (void **)&buf, &size);
2008 }
2009
2010 int
2011 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2012                   const u64 persistent_fid, const u64 volatile_fid,
2013                   __u8 oplock_level)
2014 {
2015         int rc;
2016         struct smb2_oplock_break *req = NULL;
2017
2018         cFYI(1, "SMB2_oplock_break");
2019         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2020
2021         if (rc)
2022                 return rc;
2023
2024         req->VolatileFid = volatile_fid;
2025         req->PersistentFid = persistent_fid;
2026         req->OplockLevel = oplock_level;
2027         req->hdr.CreditRequest = cpu_to_le16(1);
2028
2029         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2030         /* SMB2 buffer freed by function above */
2031
2032         if (rc) {
2033                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2034                 cFYI(1, "Send error in Oplock Break = %d", rc);
2035         }
2036
2037         return rc;
2038 }
2039
2040 static void
2041 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2042                         struct kstatfs *kst)
2043 {
2044         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2045                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2046         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2047         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2048         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2049         return;
2050 }
2051
2052 static int
2053 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2054                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2055 {
2056         int rc;
2057         struct smb2_query_info_req *req;
2058
2059         cFYI(1, "Query FSInfo level %d", level);
2060
2061         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2062                 return -EIO;
2063
2064         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2065         if (rc)
2066                 return rc;
2067
2068         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2069         req->FileInfoClass = level;
2070         req->PersistentFileId = persistent_fid;
2071         req->VolatileFileId = volatile_fid;
2072         /* 4 for rfc1002 length field and 1 for pad */
2073         req->InputBufferOffset =
2074                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2075         req->OutputBufferLength = cpu_to_le32(
2076                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2077
2078         iov->iov_base = (char *)req;
2079         /* 4 for rfc1002 length field */
2080         iov->iov_len = get_rfc1002_length(req) + 4;
2081         return 0;
2082 }
2083
2084 int
2085 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2086               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2087 {
2088         struct smb2_query_info_rsp *rsp = NULL;
2089         struct kvec iov;
2090         int rc = 0;
2091         int resp_buftype;
2092         struct cifs_ses *ses = tcon->ses;
2093         struct smb2_fs_full_size_info *info = NULL;
2094
2095         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2096                                 sizeof(struct smb2_fs_full_size_info),
2097                                 persistent_fid, volatile_fid);
2098         if (rc)
2099                 return rc;
2100
2101         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2102         if (rc) {
2103                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2104                 goto qinf_exit;
2105         }
2106         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2107
2108         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2109                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2110         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2111                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2112                           sizeof(struct smb2_fs_full_size_info));
2113         if (!rc)
2114                 copy_fs_info_to_kstatfs(info, fsdata);
2115
2116 qinf_exit:
2117         free_rsp_buf(resp_buftype, iov.iov_base);
2118         return rc;
2119 }
2120
2121 int
2122 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2123            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2124            const __u32 num_lock, struct smb2_lock_element *buf)
2125 {
2126         int rc = 0;
2127         struct smb2_lock_req *req = NULL;
2128         struct kvec iov[2];
2129         int resp_buf_type;
2130         unsigned int count;
2131
2132         cFYI(1, "smb2_lockv num lock %d", num_lock);
2133
2134         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2135         if (rc)
2136                 return rc;
2137
2138         req->hdr.ProcessId = cpu_to_le32(pid);
2139         req->LockCount = cpu_to_le16(num_lock);
2140
2141         req->PersistentFileId = persist_fid;
2142         req->VolatileFileId = volatile_fid;
2143
2144         count = num_lock * sizeof(struct smb2_lock_element);
2145         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2146
2147         iov[0].iov_base = (char *)req;
2148         /* 4 for rfc1002 length field and count for all locks */
2149         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2150         iov[1].iov_base = (char *)buf;
2151         iov[1].iov_len = count;
2152
2153         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2154         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2155         if (rc) {
2156                 cFYI(1, "Send error in smb2_lockv = %d", rc);
2157                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2158         }
2159
2160         return rc;
2161 }
2162
2163 int
2164 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2165           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2166           const __u64 length, const __u64 offset, const __u32 lock_flags,
2167           const bool wait)
2168 {
2169         struct smb2_lock_element lock;
2170
2171         lock.Offset = cpu_to_le64(offset);
2172         lock.Length = cpu_to_le64(length);
2173         lock.Flags = cpu_to_le32(lock_flags);
2174         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2175                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2176
2177         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2178 }
2179
2180 int
2181 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2182                  __u8 *lease_key, const __le32 lease_state)
2183 {
2184         int rc;
2185         struct smb2_lease_ack *req = NULL;
2186
2187         cFYI(1, "SMB2_lease_break");
2188         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2189
2190         if (rc)
2191                 return rc;
2192
2193         req->hdr.CreditRequest = cpu_to_le16(1);
2194         req->StructureSize = cpu_to_le16(36);
2195         inc_rfc1001_len(req, 12);
2196
2197         memcpy(req->LeaseKey, lease_key, 16);
2198         req->LeaseState = lease_state;
2199
2200         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2201         /* SMB2 buffer freed by function above */
2202
2203         if (rc) {
2204                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2205                 cFYI(1, "Send error in Lease Break = %d", rc);
2206         }
2207
2208         return rc;
2209 }