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         /* set it to the maximum buffer size value we can send with 1 credit */
 412         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 413                                SMB2_MAX_BUFFER_SIZE);
 414         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 415         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 416         /* BB Do we need to validate the SecurityMode? */
 417         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 418         server->capabilities = le32_to_cpu(rsp->Capabilities);
 419         /* Internal types */
 420         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 421
 422         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 423                                                &rsp->hdr);
 424         if (blob_length == 0) {
 425                 cifs_dbg(VFS, "missing security blob on negprot\n");
 426                 rc = -EIO;
 427                 goto neg_exit;
 428         }
 429
 430         cifs_dbg(FYI, "sec_flags 0x%x\n", sec_flags);
 431         if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) {
 432                 cifs_dbg(FYI, "Signing required\n");
 433                 if (!(server->sec_mode & (SMB2_NEGOTIATE_SIGNING_REQUIRED |
 434                       SMB2_NEGOTIATE_SIGNING_ENABLED))) {
 435                         cifs_dbg(VFS, "signing required but server lacks support\n");
 436                         rc = -EOPNOTSUPP;
 437                         goto neg_exit;
 438                 }
 439                 server->sec_mode |= SECMODE_SIGN_REQUIRED;
 440         } else if (sec_flags & CIFSSEC_MAY_SIGN) {
 441                 cifs_dbg(FYI, "Signing optional\n");
 442                 if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
 443                         cifs_dbg(FYI, "Server requires signing\n");
 444                         server->sec_mode |= SECMODE_SIGN_REQUIRED;
 445                 } else {
 446                         server->sec_mode &=
 447                                 ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
 448                 }
 449         } else {
 450                 cifs_dbg(FYI, "Signing disabled\n");
 451                 if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
 452                         cifs_dbg(VFS, "Server requires packet signing to be enabled in /proc/fs/cifs/SecurityFlags\n");
 453                         rc = -EOPNOTSUPP;
 454                         goto neg_exit;
 455                 }
 456                 server->sec_mode &=
 457                         ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
 458         }
 459
 460 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
 461         rc = decode_neg_token_init(security_blob, blob_length,
 462                                    &server->sec_type);
 463         if (rc == 1)
 464                 rc = 0;
 465         else if (rc == 0) {
 466                 rc = -EIO;
 467                 goto neg_exit;
 468         }
 469 #endif
 470
 471 neg_exit:
 472         free_rsp_buf(resp_buftype, rsp);
 473         return rc;
 474 }
 475
 476 int
 477 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 478                 const struct nls_table *nls_cp)
 479 {
 480         struct smb2_sess_setup_req *req;
 481         struct smb2_sess_setup_rsp *rsp = NULL;
 482         struct kvec iov[2];
 483         int rc = 0;
 484         int resp_buftype;
 485         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 486         struct TCP_Server_Info *server;
 487         unsigned int sec_flags;
 488         u8 temp = 0;
 489         u16 blob_length = 0;
 490         char *security_blob;
 491         char *ntlmssp_blob = NULL;
 492         bool use_spnego = false; /* else use raw ntlmssp */
 493
 494         cifs_dbg(FYI, "Session Setup\n");
 495
 496         if (ses->server)
 497                 server = ses->server;
 498         else {
 499                 rc = -EIO;
 500                 return rc;
 501         }
 502
 503         /*
 504          * If memory allocation is successful, caller of this function
 505          * frees it.
 506          */
 507         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 508         if (!ses->ntlmssp)
 509                 return -ENOMEM;
 510
 511         ses->server->secType = RawNTLMSSP;
 512
 513 ssetup_ntlmssp_authenticate:
 514         if (phase == NtLmChallenge)
 515                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 516
 517         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 518         if (rc)
 519                 return rc;
 520
 521         /* if any of auth flags (ie not sign or seal) are overriden use them */
 522         if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
 523                 sec_flags = ses->overrideSecFlg;  /* BB FIXME fix sign flags?*/
 524         else /* if override flags set only sign/seal OR them with global auth */
 525                 sec_flags = global_secflags | ses->overrideSecFlg;
 526
 527         cifs_dbg(FYI, "sec_flags 0x%x\n", sec_flags);
 528
 529         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 530         req->VcNumber = 0; /* MBZ */
 531         /* to enable echos and oplocks */
 532         req->hdr.CreditRequest = cpu_to_le16(3);
 533
 534         /* only one of SMB2 signing flags may be set in SMB2 request */
 535         if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
 536                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 537         else if (ses->server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED)
 538                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 539         else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
 540                 temp = SMB2_NEGOTIATE_SIGNING_ENABLED;
 541
 542         req->SecurityMode = temp;
 543         req->Capabilities = 0;
 544         req->Channel = 0; /* MBZ */
 545
 546         iov[0].iov_base = (char *)req;
 547         /* 4 for rfc1002 length field and 1 for pad */
 548         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 549         if (phase == NtLmNegotiate) {
 550                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 551                                        GFP_KERNEL);
 552                 if (ntlmssp_blob == NULL) {
 553                         rc = -ENOMEM;
 554                         goto ssetup_exit;
 555                 }
 556                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 557                 if (use_spnego) {
 558                         /* blob_length = build_spnego_ntlmssp_blob(
 559                                         &security_blob,
 560                                         sizeof(struct _NEGOTIATE_MESSAGE),
 561                                         ntlmssp_blob); */
 562                         /* BB eventually need to add this */
 563                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 564                         rc = -EOPNOTSUPP;
 565                         kfree(ntlmssp_blob);
 566                         goto ssetup_exit;
 567                 } else {
 568                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 569                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 570                         security_blob = ntlmssp_blob;
 571                 }
 572         } else if (phase == NtLmAuthenticate) {
 573                 req->hdr.SessionId = ses->Suid;
 574                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 575                                        GFP_KERNEL);
 576                 if (ntlmssp_blob == NULL) {
 577                         rc = -ENOMEM;
 578                         goto ssetup_exit;
 579                 }
 580                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 581                                              nls_cp);
 582                 if (rc) {
 583                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
 584                                  rc);
 585                         goto ssetup_exit; /* BB double check error handling */
 586                 }
 587                 if (use_spnego) {
 588                         /* blob_length = build_spnego_ntlmssp_blob(
 589                                                         &security_blob,
 590                                                         blob_length,
 591                                                         ntlmssp_blob); */
 592                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 593                         rc = -EOPNOTSUPP;
 594                         kfree(ntlmssp_blob);
 595                         goto ssetup_exit;
 596                 } else {
 597                         security_blob = ntlmssp_blob;
 598                 }
 599         } else {
 600                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
 601                 rc = -EIO;
 602                 goto ssetup_exit;
 603         }
 604
 605         /* Testing shows that buffer offset must be at location of Buffer[0] */
 606         req->SecurityBufferOffset =
 607                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 608                                             1 /* pad */ - 4 /* rfc1001 len */);
 609         req->SecurityBufferLength = cpu_to_le16(blob_length);
 610         iov[1].iov_base = security_blob;
 611         iov[1].iov_len = blob_length;
 612
 613         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 614
 615         /* BB add code to build os and lm fields */
 616
 617         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 618                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 619
 620         kfree(security_blob);
 621         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 622         if (resp_buftype != CIFS_NO_BUFFER &&
 623             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 624                 if (phase != NtLmNegotiate) {
 625                         cifs_dbg(VFS, "Unexpected more processing error\n");
 626                         goto ssetup_exit;
 627                 }
 628                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 629                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 630                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 631                                  le16_to_cpu(rsp->SecurityBufferOffset));
 632                         rc = -EIO;
 633                         goto ssetup_exit;
 634                 }
 635
 636                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 637                 phase = NtLmChallenge; /* process ntlmssp challenge */
 638                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 639                 ses->Suid = rsp->hdr.SessionId;
 640                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 641                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 642         }
 643
 644         /*
 645          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 646          * but at least the raw NTLMSSP case works.
 647          */
 648         /*
 649          * No tcon so can't do
 650          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 651          */
 652         if (rc != 0)
 653                 goto ssetup_exit;
 654
 655         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 656 ssetup_exit:
 657         free_rsp_buf(resp_buftype, rsp);
 658
 659         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 660         if ((phase == NtLmChallenge) && (rc == 0))
 661                 goto ssetup_ntlmssp_authenticate;
 662         return rc;
 663 }
 664
 665 int
 666 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 667 {
 668         struct smb2_logoff_req *req; /* response is also trivial struct */
 669         int rc = 0;
 670         struct TCP_Server_Info *server;
 671
 672         cifs_dbg(FYI, "disconnect session %p\n", ses);
 673
 674         if (ses && (ses->server))
 675                 server = ses->server;
 676         else
 677                 return -EIO;
 678
 679         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 680         if (rc)
 681                 return rc;
 682
 683          /* since no tcon, smb2_init can not do this, so do here */
 684         req->hdr.SessionId = ses->Suid;
 685         if (server->sec_mode & SECMODE_SIGN_REQUIRED)
 686                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 687
 688         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 689         /*
 690          * No tcon so can't do
 691          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 692          */
 693         return rc;
 694 }
 695
 696 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 697 {
 698         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 699 }
 700
 701 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 702
 703 int
 704 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 705           struct cifs_tcon *tcon, const struct nls_table *cp)
 706 {
 707         struct smb2_tree_connect_req *req;
 708         struct smb2_tree_connect_rsp *rsp = NULL;
 709         struct kvec iov[2];
 710         int rc = 0;
 711         int resp_buftype;
 712         int unc_path_len;
 713         struct TCP_Server_Info *server;
 714         __le16 *unc_path = NULL;
 715
 716         cifs_dbg(FYI, "TCON\n");
 717
 718         if ((ses->server) && tree)
 719                 server = ses->server;
 720         else
 721                 return -EIO;
 722
 723         if (tcon && tcon->bad_network_name)
 724                 return -ENOENT;
 725
 726         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 727         if (unc_path == NULL)
 728                 return -ENOMEM;
 729
 730         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 731         unc_path_len *= 2;
 732         if (unc_path_len < 2) {
 733                 kfree(unc_path);
 734                 return -EINVAL;
 735         }
 736
 737         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 738         if (rc) {
 739                 kfree(unc_path);
 740                 return rc;
 741         }
 742
 743         if (tcon == NULL) {
 744                 /* since no tcon, smb2_init can not do this, so do here */
 745                 req->hdr.SessionId = ses->Suid;
 746                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 747                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 748         }
 749
 750         iov[0].iov_base = (char *)req;
 751         /* 4 for rfc1002 length field and 1 for pad */
 752         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 753
 754         /* Testing shows that buffer offset must be at location of Buffer[0] */
 755         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 756                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 757         req->PathLength = cpu_to_le16(unc_path_len - 2);
 758         iov[1].iov_base = unc_path;
 759         iov[1].iov_len = unc_path_len;
 760
 761         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 762
 763         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 764         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 765
 766         if (rc != 0) {
 767                 if (tcon) {
 768                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 769                         tcon->need_reconnect = true;
 770                 }
 771                 goto tcon_error_exit;
 772         }
 773
 774         if (tcon == NULL) {
 775                 ses->ipc_tid = rsp->hdr.TreeId;
 776                 goto tcon_exit;
 777         }
 778
 779         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 780                 cifs_dbg(FYI, "connection to disk share\n");
 781         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 782                 tcon->ipc = true;
 783                 cifs_dbg(FYI, "connection to pipe share\n");
 784         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 785                 tcon->print = true;
 786                 cifs_dbg(FYI, "connection to printer\n");
 787         } else {
 788                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 789                 rc = -EOPNOTSUPP;
 790                 goto tcon_error_exit;
 791         }
 792
 793         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 794         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 795         tcon->tidStatus = CifsGood;
 796         tcon->need_reconnect = false;
 797         tcon->tid = rsp->hdr.TreeId;
 798         strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
 799
 800         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 801             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 802                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
 803
 804 tcon_exit:
 805         free_rsp_buf(resp_buftype, rsp);
 806         kfree(unc_path);
 807         return rc;
 808
 809 tcon_error_exit:
 810         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 811                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
 812                 if (tcon)
 813                         tcon->bad_network_name = true;
 814         }
 815         goto tcon_exit;
 816 }
 817
 818 int
 819 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 820 {
 821         struct smb2_tree_disconnect_req *req; /* response is trivial */
 822         int rc = 0;
 823         struct TCP_Server_Info *server;
 824         struct cifs_ses *ses = tcon->ses;
 825
 826         cifs_dbg(FYI, "Tree Disconnect\n");
 827
 828         if (ses && (ses->server))
 829                 server = ses->server;
 830         else
 831                 return -EIO;
 832
 833         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 834                 return 0;
 835
 836         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 837         if (rc)
 838                 return rc;
 839
 840         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 841         if (rc)
 842                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 843
 844         return rc;
 845 }
 846
 847 static struct create_lease *
 848 create_lease_buf(u8 *lease_key, u8 oplock)
 849 {
 850         struct create_lease *buf;
 851
 852         buf = kzalloc(sizeof(struct create_lease), GFP_KERNEL);
 853         if (!buf)
 854                 return NULL;
 855
 856         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
 857         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
 858         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
 859                 buf->lcontext.LeaseState = SMB2_LEASE_WRITE_CACHING |
 860                                            SMB2_LEASE_READ_CACHING;
 861         else if (oplock == SMB2_OPLOCK_LEVEL_II)
 862                 buf->lcontext.LeaseState = SMB2_LEASE_READ_CACHING;
 863         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
 864                 buf->lcontext.LeaseState = SMB2_LEASE_HANDLE_CACHING |
 865                                            SMB2_LEASE_READ_CACHING |
 866                                            SMB2_LEASE_WRITE_CACHING;
 867
 868         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 869                                         (struct create_lease, lcontext));
 870         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
 871         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 872                                 (struct create_lease, Name));
 873         buf->ccontext.NameLength = cpu_to_le16(4);
 874         buf->Name[0] = 'R';
 875         buf->Name[1] = 'q';
 876         buf->Name[2] = 'L';
 877         buf->Name[3] = 's';
 878         return buf;
 879 }
 880
 881 static __u8
 882 parse_lease_state(struct smb2_create_rsp *rsp)
 883 {
 884         char *data_offset;
 885         struct create_lease *lc;
 886         bool found = false;
 887
 888         data_offset = (char *)rsp;
 889         data_offset += 4 + le32_to_cpu(rsp->CreateContextsOffset);
 890         lc = (struct create_lease *)data_offset;
 891         do {
 892                 char *name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;
 893                 if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||
 894                     strncmp(name, "RqLs", 4)) {
 895                         lc = (struct create_lease *)((char *)lc
 896                                         + le32_to_cpu(lc->ccontext.Next));
 897                         continue;
 898                 }
 899                 if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
 900                         return SMB2_OPLOCK_LEVEL_NOCHANGE;
 901                 found = true;
 902                 break;
 903         } while (le32_to_cpu(lc->ccontext.Next) != 0);
 904
 905         if (!found)
 906                 return 0;
 907
 908         return smb2_map_lease_to_oplock(lc->lcontext.LeaseState);
 909 }
 910
 911 int
 912 SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
 913           u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
 914           __u32 create_disposition, __u32 file_attributes, __u32 create_options,
 915           __u8 *oplock, struct smb2_file_all_info *buf)
 916 {
 917         struct smb2_create_req *req;
 918         struct smb2_create_rsp *rsp;
 919         struct TCP_Server_Info *server;
 920         struct cifs_ses *ses = tcon->ses;
 921         struct kvec iov[3];
 922         int resp_buftype;
 923         int uni_path_len;
 924         __le16 *copy_path = NULL;
 925         int copy_size;
 926         int rc = 0;
 927         int num_iovecs = 2;
 928
 929         cifs_dbg(FYI, "create/open\n");
 930
 931         if (ses && (ses->server))
 932                 server = ses->server;
 933         else
 934                 return -EIO;
 935
 936         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
 937         if (rc)
 938                 return rc;
 939
 940         req->ImpersonationLevel = IL_IMPERSONATION;
 941         req->DesiredAccess = cpu_to_le32(desired_access);
 942         /* File attributes ignored on open (used in create though) */
 943         req->FileAttributes = cpu_to_le32(file_attributes);
 944         req->ShareAccess = FILE_SHARE_ALL_LE;
 945         req->CreateDisposition = cpu_to_le32(create_disposition);
 946         req->CreateOptions = cpu_to_le32(create_options);
 947         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
 948         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)
 949                         - 8 /* pad */ - 4 /* do not count rfc1001 len field */);
 950
 951         iov[0].iov_base = (char *)req;
 952         /* 4 for rfc1002 length field */
 953         iov[0].iov_len = get_rfc1002_length(req) + 4;
 954
 955         /* MUST set path len (NameLength) to 0 opening root of share */
 956         if (uni_path_len >= 4) {
 957                 req->NameLength = cpu_to_le16(uni_path_len - 2);
 958                 /* -1 since last byte is buf[0] which is sent below (path) */
 959                 iov[0].iov_len--;
 960                 if (uni_path_len % 8 != 0) {
 961                         copy_size = uni_path_len / 8 * 8;
 962                         if (copy_size < uni_path_len)
 963                                 copy_size += 8;
 964
 965                         copy_path = kzalloc(copy_size, GFP_KERNEL);
 966                         if (!copy_path)
 967                                 return -ENOMEM;
 968                         memcpy((char *)copy_path, (const char *)path,
 969                                 uni_path_len);
 970                         uni_path_len = copy_size;
 971                         path = copy_path;
 972                 }
 973
 974                 iov[1].iov_len = uni_path_len;
 975                 iov[1].iov_base = path;
 976                 /*
 977                  * -1 since last byte is buf[0] which was counted in
 978                  * smb2_buf_len.
 979                  */
 980                 inc_rfc1001_len(req, uni_path_len - 1);
 981         } else {
 982                 iov[0].iov_len += 7;
 983                 req->hdr.smb2_buf_length = cpu_to_be32(be32_to_cpu(
 984                                 req->hdr.smb2_buf_length) + 8 - 1);
 985                 num_iovecs = 1;
 986                 req->NameLength = 0;
 987         }
 988
 989         if (!server->oplocks)
 990                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
 991
 992         if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
 993             *oplock == SMB2_OPLOCK_LEVEL_NONE)
 994                 req->RequestedOplockLevel = *oplock;
 995         else {
 996                 iov[num_iovecs].iov_base = create_lease_buf(oplock+1, *oplock);
 997                 if (iov[num_iovecs].iov_base == NULL) {
 998                         cifs_small_buf_release(req);
 999                         kfree(copy_path);
1000                         return -ENOMEM;
1001                 }
1002                 iov[num_iovecs].iov_len = sizeof(struct create_lease);
1003                 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1004                 req->CreateContextsOffset = cpu_to_le32(
1005                         sizeof(struct smb2_create_req) - 4 - 8 +
1006                         iov[num_iovecs-1].iov_len);
1007                 req->CreateContextsLength = cpu_to_le32(
1008                         sizeof(struct create_lease));
1009                 inc_rfc1001_len(&req->hdr, sizeof(struct create_lease));
1010                 num_iovecs++;
1011         }
1012
1013         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1014         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1015
1016         if (rc != 0) {
1017                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1018                 goto creat_exit;
1019         }
1020
1021         *persistent_fid = rsp->PersistentFileId;
1022         *volatile_fid = rsp->VolatileFileId;
1023
1024         if (buf) {
1025                 memcpy(buf, &rsp->CreationTime, 32);
1026                 buf->AllocationSize = rsp->AllocationSize;
1027                 buf->EndOfFile = rsp->EndofFile;
1028                 buf->Attributes = rsp->FileAttributes;
1029                 buf->NumberOfLinks = cpu_to_le32(1);
1030                 buf->DeletePending = 0;
1031         }
1032
1033         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1034                 *oplock = parse_lease_state(rsp);
1035         else
1036                 *oplock = rsp->OplockLevel;
1037 creat_exit:
1038         kfree(copy_path);
1039         free_rsp_buf(resp_buftype, rsp);
1040         return rc;
1041 }
1042
1043 int
1044 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1045            u64 persistent_fid, u64 volatile_fid)
1046 {
1047         struct smb2_close_req *req;
1048         struct smb2_close_rsp *rsp;
1049         struct TCP_Server_Info *server;
1050         struct cifs_ses *ses = tcon->ses;
1051         struct kvec iov[1];
1052         int resp_buftype;
1053         int rc = 0;
1054
1055         cifs_dbg(FYI, "Close\n");
1056
1057         if (ses && (ses->server))
1058                 server = ses->server;
1059         else
1060                 return -EIO;
1061
1062         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1063         if (rc)
1064                 return rc;
1065
1066         req->PersistentFileId = persistent_fid;
1067         req->VolatileFileId = volatile_fid;
1068
1069         iov[0].iov_base = (char *)req;
1070         /* 4 for rfc1002 length field */
1071         iov[0].iov_len = get_rfc1002_length(req) + 4;
1072
1073         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1074         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1075
1076         if (rc != 0) {
1077                 if (tcon)
1078                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1079                 goto close_exit;
1080         }
1081
1082         /* BB FIXME - decode close response, update inode for caching */
1083
1084 close_exit:
1085         free_rsp_buf(resp_buftype, rsp);
1086         return rc;
1087 }
1088
1089 static int
1090 validate_buf(unsigned int offset, unsigned int buffer_length,
1091              struct smb2_hdr *hdr, unsigned int min_buf_size)
1092
1093 {
1094         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1095         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1096         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1097         char *end_of_buf = begin_of_buf + buffer_length;
1098
1099
1100         if (buffer_length < min_buf_size) {
1101                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1102                          buffer_length, min_buf_size);
1103                 return -EINVAL;
1104         }
1105
1106         /* check if beyond RFC1001 maximum length */
1107         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1108                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1109                          buffer_length, smb_len);
1110                 return -EINVAL;
1111         }
1112
1113         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1114                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1115                 return -EINVAL;
1116         }
1117
1118         return 0;
1119 }
1120
1121 /*
1122  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1123  * Caller must free buffer.
1124  */
1125 static int
1126 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1127                       struct smb2_hdr *hdr, unsigned int minbufsize,
1128                       char *data)
1129
1130 {
1131         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1132         int rc;
1133
1134         if (!data)
1135                 return -EINVAL;
1136
1137         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1138         if (rc)
1139                 return rc;
1140
1141         memcpy(data, begin_of_buf, buffer_length);
1142
1143         return 0;
1144 }
1145
1146 static int
1147 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1148            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1149            size_t output_len, size_t min_len, void *data)
1150 {
1151         struct smb2_query_info_req *req;
1152         struct smb2_query_info_rsp *rsp = NULL;
1153         struct kvec iov[2];
1154         int rc = 0;
1155         int resp_buftype;
1156         struct TCP_Server_Info *server;
1157         struct cifs_ses *ses = tcon->ses;
1158
1159         cifs_dbg(FYI, "Query Info\n");
1160
1161         if (ses && (ses->server))
1162                 server = ses->server;
1163         else
1164                 return -EIO;
1165
1166         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1167         if (rc)
1168                 return rc;
1169
1170         req->InfoType = SMB2_O_INFO_FILE;
1171         req->FileInfoClass = info_class;
1172         req->PersistentFileId = persistent_fid;
1173         req->VolatileFileId = volatile_fid;
1174         /* 4 for rfc1002 length field and 1 for Buffer */
1175         req->InputBufferOffset =
1176                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1177         req->OutputBufferLength = cpu_to_le32(output_len);
1178
1179         iov[0].iov_base = (char *)req;
1180         /* 4 for rfc1002 length field */
1181         iov[0].iov_len = get_rfc1002_length(req) + 4;
1182
1183         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1184         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1185
1186         if (rc) {
1187                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1188                 goto qinf_exit;
1189         }
1190
1191         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1192                                    le32_to_cpu(rsp->OutputBufferLength),
1193                                    &rsp->hdr, min_len, data);
1194
1195 qinf_exit:
1196         free_rsp_buf(resp_buftype, rsp);
1197         return rc;
1198 }
1199
1200 int
1201 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1202                 u64 persistent_fid, u64 volatile_fid,
1203                 struct smb2_file_all_info *data)
1204 {
1205         return query_info(xid, tcon, persistent_fid, volatile_fid,
1206                           FILE_ALL_INFORMATION,
1207                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
1208                           sizeof(struct smb2_file_all_info), data);
1209 }
1210
1211 int
1212 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1213                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1214 {
1215         return query_info(xid, tcon, persistent_fid, volatile_fid,
1216                           FILE_INTERNAL_INFORMATION,
1217                           sizeof(struct smb2_file_internal_info),
1218                           sizeof(struct smb2_file_internal_info), uniqueid);
1219 }
1220
1221 /*
1222  * This is a no-op for now. We're not really interested in the reply, but
1223  * rather in the fact that the server sent one and that server->lstrp
1224  * gets updated.
1225  *
1226  * FIXME: maybe we should consider checking that the reply matches request?
1227  */
1228 static void
1229 smb2_echo_callback(struct mid_q_entry *mid)
1230 {
1231         struct TCP_Server_Info *server = mid->callback_data;
1232         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1233         unsigned int credits_received = 1;
1234
1235         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1236                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1237
1238         DeleteMidQEntry(mid);
1239         add_credits(server, credits_received, CIFS_ECHO_OP);
1240 }
1241
1242 int
1243 SMB2_echo(struct TCP_Server_Info *server)
1244 {
1245         struct smb2_echo_req *req;
1246         int rc = 0;
1247         struct kvec iov;
1248         struct smb_rqst rqst = { .rq_iov = &iov,
1249                                  .rq_nvec = 1 };
1250
1251         cifs_dbg(FYI, "In echo request\n");
1252
1253         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1254         if (rc)
1255                 return rc;
1256
1257         req->hdr.CreditRequest = cpu_to_le16(1);
1258
1259         iov.iov_base = (char *)req;
1260         /* 4 for rfc1002 length field */
1261         iov.iov_len = get_rfc1002_length(req) + 4;
1262
1263         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1264                              CIFS_ECHO_OP);
1265         if (rc)
1266                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1267
1268         cifs_small_buf_release(req);
1269         return rc;
1270 }
1271
1272 int
1273 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1274            u64 volatile_fid)
1275 {
1276         struct smb2_flush_req *req;
1277         struct TCP_Server_Info *server;
1278         struct cifs_ses *ses = tcon->ses;
1279         struct kvec iov[1];
1280         int resp_buftype;
1281         int rc = 0;
1282
1283         cifs_dbg(FYI, "Flush\n");
1284
1285         if (ses && (ses->server))
1286                 server = ses->server;
1287         else
1288                 return -EIO;
1289
1290         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1291         if (rc)
1292                 return rc;
1293
1294         req->PersistentFileId = persistent_fid;
1295         req->VolatileFileId = volatile_fid;
1296
1297         iov[0].iov_base = (char *)req;
1298         /* 4 for rfc1002 length field */
1299         iov[0].iov_len = get_rfc1002_length(req) + 4;
1300
1301         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1302
1303         if ((rc != 0) && tcon)
1304                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1305
1306         free_rsp_buf(resp_buftype, iov[0].iov_base);
1307         return rc;
1308 }
1309
1310 /*
1311  * To form a chain of read requests, any read requests after the first should
1312  * have the end_of_chain boolean set to true.
1313  */
1314 static int
1315 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1316                   unsigned int remaining_bytes, int request_type)
1317 {
1318         int rc = -EACCES;
1319         struct smb2_read_req *req = NULL;
1320
1321         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1322         if (rc)
1323                 return rc;
1324         if (io_parms->tcon->ses->server == NULL)
1325                 return -ECONNABORTED;
1326
1327         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1328
1329         req->PersistentFileId = io_parms->persistent_fid;
1330         req->VolatileFileId = io_parms->volatile_fid;
1331         req->ReadChannelInfoOffset = 0; /* reserved */
1332         req->ReadChannelInfoLength = 0; /* reserved */
1333         req->Channel = 0; /* reserved */
1334         req->MinimumCount = 0;
1335         req->Length = cpu_to_le32(io_parms->length);
1336         req->Offset = cpu_to_le64(io_parms->offset);
1337
1338         if (request_type & CHAINED_REQUEST) {
1339                 if (!(request_type & END_OF_CHAIN)) {
1340                         /* 4 for rfc1002 length field */
1341                         req->hdr.NextCommand =
1342                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1343                 } else /* END_OF_CHAIN */
1344                         req->hdr.NextCommand = 0;
1345                 if (request_type & RELATED_REQUEST) {
1346                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1347                         /*
1348                          * Related requests use info from previous read request
1349                          * in chain.
1350                          */
1351                         req->hdr.SessionId = 0xFFFFFFFF;
1352                         req->hdr.TreeId = 0xFFFFFFFF;
1353                         req->PersistentFileId = 0xFFFFFFFF;
1354                         req->VolatileFileId = 0xFFFFFFFF;
1355                 }
1356         }
1357         if (remaining_bytes > io_parms->length)
1358                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1359         else
1360                 req->RemainingBytes = 0;
1361
1362         iov[0].iov_base = (char *)req;
1363         /* 4 for rfc1002 length field */
1364         iov[0].iov_len = get_rfc1002_length(req) + 4;
1365         return rc;
1366 }
1367
1368 static void
1369 smb2_readv_callback(struct mid_q_entry *mid)
1370 {
1371         struct cifs_readdata *rdata = mid->callback_data;
1372         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1373         struct TCP_Server_Info *server = tcon->ses->server;
1374         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1375         unsigned int credits_received = 1;
1376         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1377                                  .rq_nvec = 1,
1378                                  .rq_pages = rdata->pages,
1379                                  .rq_npages = rdata->nr_pages,
1380                                  .rq_pagesz = rdata->pagesz,
1381                                  .rq_tailsz = rdata->tailsz };
1382
1383         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1384                  __func__, mid->mid, mid->mid_state, rdata->result,
1385                  rdata->bytes);
1386
1387         switch (mid->mid_state) {
1388         case MID_RESPONSE_RECEIVED:
1389                 credits_received = le16_to_cpu(buf->CreditRequest);
1390                 /* result already set, check signature */
1391                 if (server->sec_mode &
1392                     (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
1393                         int rc;
1394
1395                         rc = smb2_verify_signature(&rqst, server);
1396                         if (rc)
1397                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1398                                          rc);
1399                 }
1400                 /* FIXME: should this be counted toward the initiating task? */
1401                 task_io_account_read(rdata->bytes);
1402                 cifs_stats_bytes_read(tcon, rdata->bytes);
1403                 break;
1404         case MID_REQUEST_SUBMITTED:
1405         case MID_RETRY_NEEDED:
1406                 rdata->result = -EAGAIN;
1407                 break;
1408         default:
1409                 if (rdata->result != -ENODATA)
1410                         rdata->result = -EIO;
1411         }
1412
1413         if (rdata->result)
1414                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1415
1416         queue_work(cifsiod_wq, &rdata->work);
1417         DeleteMidQEntry(mid);
1418         add_credits(server, credits_received, 0);
1419 }
1420
1421 /* smb2_async_readv - send an async write, and set up mid to handle result */
1422 int
1423 smb2_async_readv(struct cifs_readdata *rdata)
1424 {
1425         int rc;
1426         struct smb2_hdr *buf;
1427         struct cifs_io_parms io_parms;
1428         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1429                                  .rq_nvec = 1 };
1430
1431         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1432                  __func__, rdata->offset, rdata->bytes);
1433
1434         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1435         io_parms.offset = rdata->offset;
1436         io_parms.length = rdata->bytes;
1437         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1438         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1439         io_parms.pid = rdata->pid;
1440         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1441         if (rc)
1442                 return rc;
1443
1444         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1445         /* 4 for rfc1002 length field */
1446         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1447
1448         kref_get(&rdata->refcount);
1449         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1450                              cifs_readv_receive, smb2_readv_callback,
1451                              rdata, 0);
1452         if (rc) {
1453                 kref_put(&rdata->refcount, cifs_readdata_release);
1454                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1455         }
1456
1457         cifs_small_buf_release(buf);
1458         return rc;
1459 }
1460
1461 int
1462 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1463           unsigned int *nbytes, char **buf, int *buf_type)
1464 {
1465         int resp_buftype, rc = -EACCES;
1466         struct smb2_read_rsp *rsp = NULL;
1467         struct kvec iov[1];
1468
1469         *nbytes = 0;
1470         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1471         if (rc)
1472                 return rc;
1473
1474         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1475                           &resp_buftype, CIFS_LOG_ERROR);
1476
1477         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1478
1479         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1480                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1481                 return 0;
1482         }
1483
1484         if (rc) {
1485                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1486                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1487         } else {
1488                 *nbytes = le32_to_cpu(rsp->DataLength);
1489                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1490                     (*nbytes > io_parms->length)) {
1491                         cifs_dbg(FYI, "bad length %d for count %d\n",
1492                                  *nbytes, io_parms->length);
1493                         rc = -EIO;
1494                         *nbytes = 0;
1495                 }
1496         }
1497
1498         if (*buf) {
1499                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1500                        *nbytes);
1501                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1502         } else if (resp_buftype != CIFS_NO_BUFFER) {
1503                 *buf = iov[0].iov_base;
1504                 if (resp_buftype == CIFS_SMALL_BUFFER)
1505                         *buf_type = CIFS_SMALL_BUFFER;
1506                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1507                         *buf_type = CIFS_LARGE_BUFFER;
1508         }
1509         return rc;
1510 }
1511
1512 /*
1513  * Check the mid_state and signature on received buffer (if any), and queue the
1514  * workqueue completion task.
1515  */
1516 static void
1517 smb2_writev_callback(struct mid_q_entry *mid)
1518 {
1519         struct cifs_writedata *wdata = mid->callback_data;
1520         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1521         unsigned int written;
1522         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1523         unsigned int credits_received = 1;
1524
1525         switch (mid->mid_state) {
1526         case MID_RESPONSE_RECEIVED:
1527                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1528                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1529                 if (wdata->result != 0)
1530                         break;
1531
1532                 written = le32_to_cpu(rsp->DataLength);
1533                 /*
1534                  * Mask off high 16 bits when bytes written as returned
1535                  * by the server is greater than bytes requested by the
1536                  * client. OS/2 servers are known to set incorrect
1537                  * CountHigh values.
1538                  */
1539                 if (written > wdata->bytes)
1540                         written &= 0xFFFF;
1541
1542                 if (written < wdata->bytes)
1543                         wdata->result = -ENOSPC;
1544                 else
1545                         wdata->bytes = written;
1546                 break;
1547         case MID_REQUEST_SUBMITTED:
1548         case MID_RETRY_NEEDED:
1549                 wdata->result = -EAGAIN;
1550                 break;
1551         default:
1552                 wdata->result = -EIO;
1553                 break;
1554         }
1555
1556         if (wdata->result)
1557                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1558
1559         queue_work(cifsiod_wq, &wdata->work);
1560         DeleteMidQEntry(mid);
1561         add_credits(tcon->ses->server, credits_received, 0);
1562 }
1563
1564 /* smb2_async_writev - send an async write, and set up mid to handle result */
1565 int
1566 smb2_async_writev(struct cifs_writedata *wdata)
1567 {
1568         int rc = -EACCES;
1569         struct smb2_write_req *req = NULL;
1570         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1571         struct kvec iov;
1572         struct smb_rqst rqst;
1573
1574         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1575         if (rc)
1576                 goto async_writev_out;
1577
1578         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1579
1580         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1581         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1582         req->WriteChannelInfoOffset = 0;
1583         req->WriteChannelInfoLength = 0;
1584         req->Channel = 0;
1585         req->Offset = cpu_to_le64(wdata->offset);
1586         /* 4 for rfc1002 length field */
1587         req->DataOffset = cpu_to_le16(
1588                                 offsetof(struct smb2_write_req, Buffer) - 4);
1589         req->RemainingBytes = 0;
1590
1591         /* 4 for rfc1002 length field and 1 for Buffer */
1592         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1593         iov.iov_base = req;
1594
1595         rqst.rq_iov = &iov;
1596         rqst.rq_nvec = 1;
1597         rqst.rq_pages = wdata->pages;
1598         rqst.rq_npages = wdata->nr_pages;
1599         rqst.rq_pagesz = wdata->pagesz;
1600         rqst.rq_tailsz = wdata->tailsz;
1601
1602         cifs_dbg(FYI, "async write at %llu %u bytes\n",
1603                  wdata->offset, wdata->bytes);
1604
1605         req->Length = cpu_to_le32(wdata->bytes);
1606
1607         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1608
1609         kref_get(&wdata->refcount);
1610         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1611                                 smb2_writev_callback, wdata, 0);
1612
1613         if (rc) {
1614                 kref_put(&wdata->refcount, cifs_writedata_release);
1615                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1616         }
1617
1618 async_writev_out:
1619         cifs_small_buf_release(req);
1620         return rc;
1621 }
1622
1623 /*
1624  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1625  * The length field from io_parms must be at least 1 and indicates a number of
1626  * elements with data to write that begins with position 1 in iov array. All
1627  * data length is specified by count.
1628  */
1629 int
1630 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1631            unsigned int *nbytes, struct kvec *iov, int n_vec)
1632 {
1633         int rc = 0;
1634         struct smb2_write_req *req = NULL;
1635         struct smb2_write_rsp *rsp = NULL;
1636         int resp_buftype;
1637         *nbytes = 0;
1638
1639         if (n_vec < 1)
1640                 return rc;
1641
1642         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1643         if (rc)
1644                 return rc;
1645
1646         if (io_parms->tcon->ses->server == NULL)
1647                 return -ECONNABORTED;
1648
1649         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1650
1651         req->PersistentFileId = io_parms->persistent_fid;
1652         req->VolatileFileId = io_parms->volatile_fid;
1653         req->WriteChannelInfoOffset = 0;
1654         req->WriteChannelInfoLength = 0;
1655         req->Channel = 0;
1656         req->Length = cpu_to_le32(io_parms->length);
1657         req->Offset = cpu_to_le64(io_parms->offset);
1658         /* 4 for rfc1002 length field */
1659         req->DataOffset = cpu_to_le16(
1660                                 offsetof(struct smb2_write_req, Buffer) - 4);
1661         req->RemainingBytes = 0;
1662
1663         iov[0].iov_base = (char *)req;
1664         /* 4 for rfc1002 length field and 1 for Buffer */
1665         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1666
1667         /* length of entire message including data to be written */
1668         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1669
1670         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1671                           &resp_buftype, 0);
1672         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1673
1674         if (rc) {
1675                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1676                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
1677         } else
1678                 *nbytes = le32_to_cpu(rsp->DataLength);
1679
1680         free_rsp_buf(resp_buftype, rsp);
1681         return rc;
1682 }
1683
1684 static unsigned int
1685 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1686 {
1687         int len;
1688         unsigned int entrycount = 0;
1689         unsigned int next_offset = 0;
1690         FILE_DIRECTORY_INFO *entryptr;
1691
1692         if (bufstart == NULL)
1693                 return 0;
1694
1695         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1696
1697         while (1) {
1698                 entryptr = (FILE_DIRECTORY_INFO *)
1699                                         ((char *)entryptr + next_offset);
1700
1701                 if ((char *)entryptr + size > end_of_buf) {
1702                         cifs_dbg(VFS, "malformed search entry would overflow\n");
1703                         break;
1704                 }
1705
1706                 len = le32_to_cpu(entryptr->FileNameLength);
1707                 if ((char *)entryptr + len + size > end_of_buf) {
1708                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
1709                                  end_of_buf);
1710                         break;
1711                 }
1712
1713                 *lastentry = (char *)entryptr;
1714                 entrycount++;
1715
1716                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1717                 if (!next_offset)
1718                         break;
1719         }
1720
1721         return entrycount;
1722 }
1723
1724 /*
1725  * Readdir/FindFirst
1726  */
1727 int
1728 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1729                      u64 persistent_fid, u64 volatile_fid, int index,
1730                      struct cifs_search_info *srch_inf)
1731 {
1732         struct smb2_query_directory_req *req;
1733         struct smb2_query_directory_rsp *rsp = NULL;
1734         struct kvec iov[2];
1735         int rc = 0;
1736         int len;
1737         int resp_buftype;
1738         unsigned char *bufptr;
1739         struct TCP_Server_Info *server;
1740         struct cifs_ses *ses = tcon->ses;
1741         __le16 asteriks = cpu_to_le16('*');
1742         char *end_of_smb;
1743         unsigned int output_size = CIFSMaxBufSize;
1744         size_t info_buf_size;
1745
1746         if (ses && (ses->server))
1747                 server = ses->server;
1748         else
1749                 return -EIO;
1750
1751         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1752         if (rc)
1753                 return rc;
1754
1755         switch (srch_inf->info_level) {
1756         case SMB_FIND_FILE_DIRECTORY_INFO:
1757                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1758                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1759                 break;
1760         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1761                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1762                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1763                 break;
1764         default:
1765                 cifs_dbg(VFS, "info level %u isn't supported\n",
1766                          srch_inf->info_level);
1767                 rc = -EINVAL;
1768                 goto qdir_exit;
1769         }
1770
1771         req->FileIndex = cpu_to_le32(index);
1772         req->PersistentFileId = persistent_fid;
1773         req->VolatileFileId = volatile_fid;
1774
1775         len = 0x2;
1776         bufptr = req->Buffer;
1777         memcpy(bufptr, &asteriks, len);
1778
1779         req->FileNameOffset =
1780                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
1781         req->FileNameLength = cpu_to_le16(len);
1782         /*
1783          * BB could be 30 bytes or so longer if we used SMB2 specific
1784          * buffer lengths, but this is safe and close enough.
1785          */
1786         output_size = min_t(unsigned int, output_size, server->maxBuf);
1787         output_size = min_t(unsigned int, output_size, 2 << 15);
1788         req->OutputBufferLength = cpu_to_le32(output_size);
1789
1790         iov[0].iov_base = (char *)req;
1791         /* 4 for RFC1001 length and 1 for Buffer */
1792         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1793
1794         iov[1].iov_base = (char *)(req->Buffer);
1795         iov[1].iov_len = len;
1796
1797         inc_rfc1001_len(req, len - 1 /* Buffer */);
1798
1799         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
1800         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
1801
1802         if (rc) {
1803                 if (rc == -ENODATA && rsp->hdr.Status == STATUS_NO_MORE_FILES) {
1804                         srch_inf->endOfSearch = true;
1805                         rc = 0;
1806                 }
1807                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
1808                 goto qdir_exit;
1809         }
1810
1811         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
1812                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
1813                           info_buf_size);
1814         if (rc)
1815                 goto qdir_exit;
1816
1817         srch_inf->unicode = true;
1818
1819         if (srch_inf->ntwrk_buf_start) {
1820                 if (srch_inf->smallBuf)
1821                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
1822                 else
1823                         cifs_buf_release(srch_inf->ntwrk_buf_start);
1824         }
1825         srch_inf->ntwrk_buf_start = (char *)rsp;
1826         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
1827                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
1828         /* 4 for rfc1002 length field */
1829         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
1830         srch_inf->entries_in_buffer =
1831                         num_entries(srch_inf->srch_entries_start, end_of_smb,
1832                                     &srch_inf->last_entry, info_buf_size);
1833         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
1834         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
1835                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
1836                  srch_inf->srch_entries_start, srch_inf->last_entry);
1837         if (resp_buftype == CIFS_LARGE_BUFFER)
1838                 srch_inf->smallBuf = false;
1839         else if (resp_buftype == CIFS_SMALL_BUFFER)
1840                 srch_inf->smallBuf = true;
1841         else
1842                 cifs_dbg(VFS, "illegal search buffer type\n");
1843
1844         return rc;
1845
1846 qdir_exit:
1847         free_rsp_buf(resp_buftype, rsp);
1848         return rc;
1849 }
1850
1851 static int
1852 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
1853                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
1854                unsigned int num, void **data, unsigned int *size)
1855 {
1856         struct smb2_set_info_req *req;
1857         struct smb2_set_info_rsp *rsp = NULL;
1858         struct kvec *iov;
1859         int rc = 0;
1860         int resp_buftype;
1861         unsigned int i;
1862         struct TCP_Server_Info *server;
1863         struct cifs_ses *ses = tcon->ses;
1864
1865         if (ses && (ses->server))
1866                 server = ses->server;
1867         else
1868                 return -EIO;
1869
1870         if (!num)
1871                 return -EINVAL;
1872
1873         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
1874         if (!iov)
1875                 return -ENOMEM;
1876
1877         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
1878         if (rc) {
1879                 kfree(iov);
1880                 return rc;
1881         }
1882
1883         req->hdr.ProcessId = cpu_to_le32(pid);
1884
1885         req->InfoType = SMB2_O_INFO_FILE;
1886         req->FileInfoClass = info_class;
1887         req->PersistentFileId = persistent_fid;
1888         req->VolatileFileId = volatile_fid;
1889
1890         /* 4 for RFC1001 length and 1 for Buffer */
1891         req->BufferOffset =
1892                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
1893         req->BufferLength = cpu_to_le32(*size);
1894
1895         inc_rfc1001_len(req, *size - 1 /* Buffer */);
1896
1897         memcpy(req->Buffer, *data, *size);
1898
1899         iov[0].iov_base = (char *)req;
1900         /* 4 for RFC1001 length */
1901         iov[0].iov_len = get_rfc1002_length(req) + 4;
1902
1903         for (i = 1; i < num; i++) {
1904                 inc_rfc1001_len(req, size[i]);
1905                 le32_add_cpu(&req->BufferLength, size[i]);
1906                 iov[i].iov_base = (char *)data[i];
1907                 iov[i].iov_len = size[i];
1908         }
1909
1910         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
1911         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
1912
1913         if (rc != 0) {
1914                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
1915                 goto out;
1916         }
1917 out:
1918         free_rsp_buf(resp_buftype, rsp);
1919         kfree(iov);
1920         return rc;
1921 }
1922
1923 int
1924 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
1925             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
1926 {
1927         struct smb2_file_rename_info info;
1928         void **data;
1929         unsigned int size[2];
1930         int rc;
1931         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
1932
1933         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
1934         if (!data)
1935                 return -ENOMEM;
1936
1937         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
1938                               /* 0 = fail if target already exists */
1939         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
1940         info.FileNameLength = cpu_to_le32(len);
1941
1942         data[0] = &info;
1943         size[0] = sizeof(struct smb2_file_rename_info);
1944
1945         data[1] = target_file;
1946         size[1] = len + 2 /* null */;
1947
1948         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
1949                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
1950                            size);
1951         kfree(data);
1952         return rc;
1953 }
1954
1955 int
1956 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
1957                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
1958 {
1959         struct smb2_file_link_info info;
1960         void **data;
1961         unsigned int size[2];
1962         int rc;
1963         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
1964
1965         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
1966         if (!data)
1967                 return -ENOMEM;
1968
1969         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
1970                               /* 0 = fail if link already exists */
1971         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
1972         info.FileNameLength = cpu_to_le32(len);
1973
1974         data[0] = &info;
1975         size[0] = sizeof(struct smb2_file_link_info);
1976
1977         data[1] = target_file;
1978         size[1] = len + 2 /* null */;
1979
1980         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
1981                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
1982         kfree(data);
1983         return rc;
1984 }
1985
1986 int
1987 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1988              u64 volatile_fid, u32 pid, __le64 *eof)
1989 {
1990         struct smb2_file_eof_info info;
1991         void *data;
1992         unsigned int size;
1993
1994         info.EndOfFile = *eof;
1995
1996         data = &info;
1997         size = sizeof(struct smb2_file_eof_info);
1998
1999         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2000                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2001 }
2002
2003 int
2004 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2005               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2006 {
2007         unsigned int size;
2008         size = sizeof(FILE_BASIC_INFO);
2009         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2010                              current->tgid, FILE_BASIC_INFORMATION, 1,
2011                              (void **)&buf, &size);
2012 }
2013
2014 int
2015 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2016                   const u64 persistent_fid, const u64 volatile_fid,
2017                   __u8 oplock_level)
2018 {
2019         int rc;
2020         struct smb2_oplock_break *req = NULL;
2021
2022         cifs_dbg(FYI, "SMB2_oplock_break\n");
2023         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2024
2025         if (rc)
2026                 return rc;
2027
2028         req->VolatileFid = volatile_fid;
2029         req->PersistentFid = persistent_fid;
2030         req->OplockLevel = oplock_level;
2031         req->hdr.CreditRequest = cpu_to_le16(1);
2032
2033         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2034         /* SMB2 buffer freed by function above */
2035
2036         if (rc) {
2037                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2038                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2039         }
2040
2041         return rc;
2042 }
2043
2044 static void
2045 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2046                         struct kstatfs *kst)
2047 {
2048         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2049                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2050         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2051         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2052         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2053         return;
2054 }
2055
2056 static int
2057 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2058                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2059 {
2060         int rc;
2061         struct smb2_query_info_req *req;
2062
2063         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2064
2065         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2066                 return -EIO;
2067
2068         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2069         if (rc)
2070                 return rc;
2071
2072         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2073         req->FileInfoClass = level;
2074         req->PersistentFileId = persistent_fid;
2075         req->VolatileFileId = volatile_fid;
2076         /* 4 for rfc1002 length field and 1 for pad */
2077         req->InputBufferOffset =
2078                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2079         req->OutputBufferLength = cpu_to_le32(
2080                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2081
2082         iov->iov_base = (char *)req;
2083         /* 4 for rfc1002 length field */
2084         iov->iov_len = get_rfc1002_length(req) + 4;
2085         return 0;
2086 }
2087
2088 int
2089 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2090               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2091 {
2092         struct smb2_query_info_rsp *rsp = NULL;
2093         struct kvec iov;
2094         int rc = 0;
2095         int resp_buftype;
2096         struct cifs_ses *ses = tcon->ses;
2097         struct smb2_fs_full_size_info *info = NULL;
2098
2099         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2100                                 sizeof(struct smb2_fs_full_size_info),
2101                                 persistent_fid, volatile_fid);
2102         if (rc)
2103                 return rc;
2104
2105         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2106         if (rc) {
2107                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2108                 goto qinf_exit;
2109         }
2110         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2111
2112         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2113                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2114         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2115                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2116                           sizeof(struct smb2_fs_full_size_info));
2117         if (!rc)
2118                 copy_fs_info_to_kstatfs(info, fsdata);
2119
2120 qinf_exit:
2121         free_rsp_buf(resp_buftype, iov.iov_base);
2122         return rc;
2123 }
2124
2125 int
2126 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2127            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2128            const __u32 num_lock, struct smb2_lock_element *buf)
2129 {
2130         int rc = 0;
2131         struct smb2_lock_req *req = NULL;
2132         struct kvec iov[2];
2133         int resp_buf_type;
2134         unsigned int count;
2135
2136         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2137
2138         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2139         if (rc)
2140                 return rc;
2141
2142         req->hdr.ProcessId = cpu_to_le32(pid);
2143         req->LockCount = cpu_to_le16(num_lock);
2144
2145         req->PersistentFileId = persist_fid;
2146         req->VolatileFileId = volatile_fid;
2147
2148         count = num_lock * sizeof(struct smb2_lock_element);
2149         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2150
2151         iov[0].iov_base = (char *)req;
2152         /* 4 for rfc1002 length field and count for all locks */
2153         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2154         iov[1].iov_base = (char *)buf;
2155         iov[1].iov_len = count;
2156
2157         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2158         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2159         if (rc) {
2160                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2161                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2162         }
2163
2164         return rc;
2165 }
2166
2167 int
2168 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2169           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2170           const __u64 length, const __u64 offset, const __u32 lock_flags,
2171           const bool wait)
2172 {
2173         struct smb2_lock_element lock;
2174
2175         lock.Offset = cpu_to_le64(offset);
2176         lock.Length = cpu_to_le64(length);
2177         lock.Flags = cpu_to_le32(lock_flags);
2178         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2179                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2180
2181         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2182 }
2183
2184 int
2185 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2186                  __u8 *lease_key, const __le32 lease_state)
2187 {
2188         int rc;
2189         struct smb2_lease_ack *req = NULL;
2190
2191         cifs_dbg(FYI, "SMB2_lease_break\n");
2192         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2193
2194         if (rc)
2195                 return rc;
2196
2197         req->hdr.CreditRequest = cpu_to_le16(1);
2198         req->StructureSize = cpu_to_le16(36);
2199         inc_rfc1001_len(req, 12);
2200
2201         memcpy(req->LeaseKey, lease_key, 16);
2202         req->LeaseState = lease_state;
2203
2204         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2205         /* SMB2 buffer freed by function above */
2206
2207         if (rc) {
2208                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2209                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2210         }
2211
2212         return rc;
2213 }