fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2011
   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 #define SMB2_NUM_PROT 2
 308
 309 #define SMB2_PROT   0
 310 #define SMB21_PROT  1
 311 #define BAD_PROT 0xFFFF
 312
 313 #define SMB2_PROT_ID  0x0202
 314 #define SMB21_PROT_ID 0x0210
 315 #define BAD_PROT_ID   0xFFFF
 316
 317 static struct {
 318         int index;
 319         __le16 name;
 320 } smb2protocols[] = {
 321         {SMB2_PROT,  cpu_to_le16(SMB2_PROT_ID)},
 322         {SMB21_PROT, cpu_to_le16(SMB21_PROT_ID)},
 323         {BAD_PROT,   cpu_to_le16(BAD_PROT_ID)}
 324 };
 325
 326 /*
 327  *
 328  *      SMB2 Worker functions follow:
 329  *
 330  *      The general structure of the worker functions is:
 331  *      1) Call smb2_init (assembles SMB2 header)
 332  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 333  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 334  *      4) Decode SMB2 command specific fields in the fixed length area
 335  *      5) Decode variable length data area (if any for this SMB2 command type)
 336  *      6) Call free smb buffer
 337  *      7) return
 338  *
 339  */
 340
 341 int
 342 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 343 {
 344         struct smb2_negotiate_req *req;
 345         struct smb2_negotiate_rsp *rsp;
 346         struct kvec iov[1];
 347         int rc = 0;
 348         int resp_buftype;
 349         struct TCP_Server_Info *server;
 350         unsigned int sec_flags;
 351         u16 i;
 352         u16 temp = 0;
 353         int blob_offset, blob_length;
 354         char *security_blob;
 355         int flags = CIFS_NEG_OP;
 356
 357         cFYI(1, "Negotiate protocol");
 358
 359         if (ses->server)
 360                 server = ses->server;
 361         else {
 362                 rc = -EIO;
 363                 return rc;
 364         }
 365
 366         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 367         if (rc)
 368                 return rc;
 369
 370         /* if any of auth flags (ie not sign or seal) are overriden use them */
 371         if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
 372                 sec_flags = ses->overrideSecFlg;  /* BB FIXME fix sign flags?*/
 373         else /* if override flags set only sign/seal OR them with global auth */
 374                 sec_flags = global_secflags | ses->overrideSecFlg;
 375
 376         cFYI(1, "sec_flags 0x%x", sec_flags);
 377
 378         req->hdr.SessionId = 0;
 379
 380         for (i = 0; i < SMB2_NUM_PROT; i++)
 381                 req->Dialects[i] = smb2protocols[i].name;
 382
 383         req->DialectCount = cpu_to_le16(i);
 384         inc_rfc1001_len(req, i * 2);
 385
 386         /* only one of SMB2 signing flags may be set in SMB2 request */
 387         if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
 388                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 389         else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
 390                 temp = SMB2_NEGOTIATE_SIGNING_ENABLED;
 391
 392         req->SecurityMode = cpu_to_le16(temp);
 393
 394         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
 395
 396         memcpy(req->ClientGUID, cifs_client_guid, SMB2_CLIENT_GUID_SIZE);
 397
 398         iov[0].iov_base = (char *)req;
 399         /* 4 for rfc1002 length field */
 400         iov[0].iov_len = get_rfc1002_length(req) + 4;
 401
 402         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 403
 404         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 405         /*
 406          * No tcon so can't do
 407          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 408          */
 409         if (rc != 0)
 410                 goto neg_exit;
 411
 412         if (rsp == NULL) {
 413                 rc = -EIO;
 414                 goto neg_exit;
 415         }
 416
 417         cFYI(1, "mode 0x%x", rsp->SecurityMode);
 418
 419         if (rsp->DialectRevision == smb2protocols[SMB21_PROT].name)
 420                 cFYI(1, "negotiated smb2.1 dialect");
 421         else if (rsp->DialectRevision == smb2protocols[SMB2_PROT].name)
 422                 cFYI(1, "negotiated smb2 dialect");
 423         else {
 424                 cERROR(1, "Illegal dialect returned by server %d",
 425                            le16_to_cpu(rsp->DialectRevision));
 426                 rc = -EIO;
 427                 goto neg_exit;
 428         }
 429         server->dialect = le16_to_cpu(rsp->DialectRevision);
 430
 431         server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
 432         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 433         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 434         /* BB Do we need to validate the SecurityMode? */
 435         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 436         server->capabilities = le32_to_cpu(rsp->Capabilities);
 437         /* Internal types */
 438         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 439
 440         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 441                                                &rsp->hdr);
 442         if (blob_length == 0) {
 443                 cERROR(1, "missing security blob on negprot");
 444                 rc = -EIO;
 445                 goto neg_exit;
 446         }
 447
 448         cFYI(1, "sec_flags 0x%x", sec_flags);
 449         if (sec_flags & CIFSSEC_MUST_SIGN) {
 450                 cFYI(1, "Signing required");
 451                 if (!(server->sec_mode & (SMB2_NEGOTIATE_SIGNING_REQUIRED |
 452                       SMB2_NEGOTIATE_SIGNING_ENABLED))) {
 453                         cERROR(1, "signing required but server lacks support");
 454                         rc = -EOPNOTSUPP;
 455                         goto neg_exit;
 456                 }
 457                 server->sec_mode |= SECMODE_SIGN_REQUIRED;
 458         } else if (sec_flags & CIFSSEC_MAY_SIGN) {
 459                 cFYI(1, "Signing optional");
 460                 if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
 461                         cFYI(1, "Server requires signing");
 462                         server->sec_mode |= SECMODE_SIGN_REQUIRED;
 463                 } else {
 464                         server->sec_mode &=
 465                                 ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
 466                 }
 467         } else {
 468                 cFYI(1, "Signing disabled");
 469                 if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
 470                         cERROR(1, "Server requires packet signing to be enabled"
 471                                   " in /proc/fs/cifs/SecurityFlags.");
 472                         rc = -EOPNOTSUPP;
 473                         goto neg_exit;
 474                 }
 475                 server->sec_mode &=
 476                         ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
 477         }
 478
 479 #ifdef CONFIG_SMB2_ASN1  /* BB REMOVEME when updated asn1.c ready */
 480         rc = decode_neg_token_init(security_blob, blob_length,
 481                                    &server->sec_type);
 482         if (rc == 1)
 483                 rc = 0;
 484         else if (rc == 0) {
 485                 rc = -EIO;
 486                 goto neg_exit;
 487         }
 488 #endif
 489
 490 neg_exit:
 491         free_rsp_buf(resp_buftype, rsp);
 492         return rc;
 493 }
 494
 495 int
 496 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 497                 const struct nls_table *nls_cp)
 498 {
 499         struct smb2_sess_setup_req *req;
 500         struct smb2_sess_setup_rsp *rsp = NULL;
 501         struct kvec iov[2];
 502         int rc = 0;
 503         int resp_buftype;
 504         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 505         struct TCP_Server_Info *server;
 506         unsigned int sec_flags;
 507         u8 temp = 0;
 508         u16 blob_length = 0;
 509         char *security_blob;
 510         char *ntlmssp_blob = NULL;
 511         bool use_spnego = false; /* else use raw ntlmssp */
 512
 513         cFYI(1, "Session Setup");
 514
 515         if (ses->server)
 516                 server = ses->server;
 517         else {
 518                 rc = -EIO;
 519                 return rc;
 520         }
 521
 522         /*
 523          * If memory allocation is successful, caller of this function
 524          * frees it.
 525          */
 526         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 527         if (!ses->ntlmssp)
 528                 return -ENOMEM;
 529
 530         ses->server->secType = RawNTLMSSP;
 531
 532 ssetup_ntlmssp_authenticate:
 533         if (phase == NtLmChallenge)
 534                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 535
 536         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 537         if (rc)
 538                 return rc;
 539
 540         /* if any of auth flags (ie not sign or seal) are overriden use them */
 541         if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
 542                 sec_flags = ses->overrideSecFlg;  /* BB FIXME fix sign flags?*/
 543         else /* if override flags set only sign/seal OR them with global auth */
 544                 sec_flags = global_secflags | ses->overrideSecFlg;
 545
 546         cFYI(1, "sec_flags 0x%x", sec_flags);
 547
 548         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 549         req->VcNumber = 0; /* MBZ */
 550         /* to enable echos and oplocks */
 551         req->hdr.CreditRequest = cpu_to_le16(3);
 552
 553         /* only one of SMB2 signing flags may be set in SMB2 request */
 554         if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN)
 555                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 556         else if (ses->server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED)
 557                 temp = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 558         else if (sec_flags & CIFSSEC_MAY_SIGN) /* MAY_SIGN is a single flag */
 559                 temp = SMB2_NEGOTIATE_SIGNING_ENABLED;
 560
 561         req->SecurityMode = temp;
 562         req->Capabilities = 0;
 563         req->Channel = 0; /* MBZ */
 564
 565         iov[0].iov_base = (char *)req;
 566         /* 4 for rfc1002 length field and 1 for pad */
 567         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 568         if (phase == NtLmNegotiate) {
 569                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 570                                        GFP_KERNEL);
 571                 if (ntlmssp_blob == NULL) {
 572                         rc = -ENOMEM;
 573                         goto ssetup_exit;
 574                 }
 575                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 576                 if (use_spnego) {
 577                         /* blob_length = build_spnego_ntlmssp_blob(
 578                                         &security_blob,
 579                                         sizeof(struct _NEGOTIATE_MESSAGE),
 580                                         ntlmssp_blob); */
 581                         /* BB eventually need to add this */
 582                         cERROR(1, "spnego not supported for SMB2 yet");
 583                         rc = -EOPNOTSUPP;
 584                         kfree(ntlmssp_blob);
 585                         goto ssetup_exit;
 586                 } else {
 587                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 588                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 589                         security_blob = ntlmssp_blob;
 590                 }
 591         } else if (phase == NtLmAuthenticate) {
 592                 req->hdr.SessionId = ses->Suid;
 593                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 594                                        GFP_KERNEL);
 595                 if (ntlmssp_blob == NULL) {
 596                         cERROR(1, "failed to malloc ntlmssp blob");
 597                         rc = -ENOMEM;
 598                         goto ssetup_exit;
 599                 }
 600                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 601                                              nls_cp);
 602                 if (rc) {
 603                         cFYI(1, "build_ntlmssp_auth_blob failed %d", rc);
 604                         goto ssetup_exit; /* BB double check error handling */
 605                 }
 606                 if (use_spnego) {
 607                         /* blob_length = build_spnego_ntlmssp_blob(
 608                                                         &security_blob,
 609                                                         blob_length,
 610                                                         ntlmssp_blob); */
 611                         cERROR(1, "spnego not supported for SMB2 yet");
 612                         rc = -EOPNOTSUPP;
 613                         kfree(ntlmssp_blob);
 614                         goto ssetup_exit;
 615                 } else {
 616                         security_blob = ntlmssp_blob;
 617                 }
 618         } else {
 619                 cERROR(1, "illegal ntlmssp phase");
 620                 rc = -EIO;
 621                 goto ssetup_exit;
 622         }
 623
 624         /* Testing shows that buffer offset must be at location of Buffer[0] */
 625         req->SecurityBufferOffset =
 626                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 627                                             1 /* pad */ - 4 /* rfc1001 len */);
 628         req->SecurityBufferLength = cpu_to_le16(blob_length);
 629         iov[1].iov_base = security_blob;
 630         iov[1].iov_len = blob_length;
 631
 632         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 633
 634         /* BB add code to build os and lm fields */
 635
 636         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, CIFS_LOG_ERROR);
 637
 638         kfree(security_blob);
 639         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 640         if (rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 641                 if (phase != NtLmNegotiate) {
 642                         cERROR(1, "Unexpected more processing error");
 643                         goto ssetup_exit;
 644                 }
 645                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 646                         le16_to_cpu(rsp->SecurityBufferOffset)) {
 647                         cERROR(1, "Invalid security buffer offset %d",
 648                                   le16_to_cpu(rsp->SecurityBufferOffset));
 649                         rc = -EIO;
 650                         goto ssetup_exit;
 651                 }
 652
 653                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 654                 phase = NtLmChallenge; /* process ntlmssp challenge */
 655                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 656                 ses->Suid = rsp->hdr.SessionId;
 657                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 658                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 659         }
 660
 661         /*
 662          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 663          * but at least the raw NTLMSSP case works.
 664          */
 665         /*
 666          * No tcon so can't do
 667          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 668          */
 669         if (rc != 0)
 670                 goto ssetup_exit;
 671
 672         if (rsp == NULL) {
 673                 rc = -EIO;
 674                 goto ssetup_exit;
 675         }
 676
 677         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 678 ssetup_exit:
 679         free_rsp_buf(resp_buftype, rsp);
 680
 681         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 682         if ((phase == NtLmChallenge) && (rc == 0))
 683                 goto ssetup_ntlmssp_authenticate;
 684         return rc;
 685 }
 686
 687 int
 688 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 689 {
 690         struct smb2_logoff_req *req; /* response is also trivial struct */
 691         int rc = 0;
 692         struct TCP_Server_Info *server;
 693
 694         cFYI(1, "disconnect session %p", ses);
 695
 696         if (ses && (ses->server))
 697                 server = ses->server;
 698         else
 699                 return -EIO;
 700
 701         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 702         if (rc)
 703                 return rc;
 704
 705          /* since no tcon, smb2_init can not do this, so do here */
 706         req->hdr.SessionId = ses->Suid;
 707         if (server->sec_mode & SECMODE_SIGN_REQUIRED)
 708                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 709
 710         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 711         /*
 712          * No tcon so can't do
 713          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 714          */
 715         return rc;
 716 }
 717
 718 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 719 {
 720         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 721 }
 722
 723 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 724
 725 int
 726 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 727           struct cifs_tcon *tcon, const struct nls_table *cp)
 728 {
 729         struct smb2_tree_connect_req *req;
 730         struct smb2_tree_connect_rsp *rsp = NULL;
 731         struct kvec iov[2];
 732         int rc = 0;
 733         int resp_buftype;
 734         int unc_path_len;
 735         struct TCP_Server_Info *server;
 736         __le16 *unc_path = NULL;
 737
 738         cFYI(1, "TCON");
 739
 740         if ((ses->server) && tree)
 741                 server = ses->server;
 742         else
 743                 return -EIO;
 744
 745         if (tcon && tcon->bad_network_name)
 746                 return -ENOENT;
 747
 748         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 749         if (unc_path == NULL)
 750                 return -ENOMEM;
 751
 752         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 753         unc_path_len *= 2;
 754         if (unc_path_len < 2) {
 755                 kfree(unc_path);
 756                 return -EINVAL;
 757         }
 758
 759         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 760         if (rc) {
 761                 kfree(unc_path);
 762                 return rc;
 763         }
 764
 765         if (tcon == NULL) {
 766                 /* since no tcon, smb2_init can not do this, so do here */
 767                 req->hdr.SessionId = ses->Suid;
 768                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 769                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 770         }
 771
 772         iov[0].iov_base = (char *)req;
 773         /* 4 for rfc1002 length field and 1 for pad */
 774         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 775
 776         /* Testing shows that buffer offset must be at location of Buffer[0] */
 777         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 778                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 779         req->PathLength = cpu_to_le16(unc_path_len - 2);
 780         iov[1].iov_base = unc_path;
 781         iov[1].iov_len = unc_path_len;
 782
 783         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 784
 785         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 786         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 787
 788         if (rc != 0) {
 789                 if (tcon) {
 790                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 791                         tcon->need_reconnect = true;
 792                 }
 793                 goto tcon_error_exit;
 794         }
 795
 796         if (rsp == NULL) {
 797                 rc = -EIO;
 798                 goto tcon_exit;
 799         }
 800
 801         if (tcon == NULL) {
 802                 ses->ipc_tid = rsp->hdr.TreeId;
 803                 goto tcon_exit;
 804         }
 805
 806         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 807                 cFYI(1, "connection to disk share");
 808         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 809                 tcon->ipc = true;
 810                 cFYI(1, "connection to pipe share");
 811         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 812                 tcon->print = true;
 813                 cFYI(1, "connection to printer");
 814         } else {
 815                 cERROR(1, "unknown share type %d", rsp->ShareType);
 816                 rc = -EOPNOTSUPP;
 817                 goto tcon_error_exit;
 818         }
 819
 820         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 821         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
 822         tcon->tidStatus = CifsGood;
 823         tcon->need_reconnect = false;
 824         tcon->tid = rsp->hdr.TreeId;
 825         strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
 826
 827         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
 828             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
 829                 cERROR(1, "DFS capability contradicts DFS flag");
 830
 831 tcon_exit:
 832         free_rsp_buf(resp_buftype, rsp);
 833         kfree(unc_path);
 834         return rc;
 835
 836 tcon_error_exit:
 837         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
 838                 cERROR(1, "BAD_NETWORK_NAME: %s", tree);
 839                 tcon->bad_network_name = true;
 840         }
 841         goto tcon_exit;
 842 }
 843
 844 int
 845 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
 846 {
 847         struct smb2_tree_disconnect_req *req; /* response is trivial */
 848         int rc = 0;
 849         struct TCP_Server_Info *server;
 850         struct cifs_ses *ses = tcon->ses;
 851
 852         cFYI(1, "Tree Disconnect");
 853
 854         if (ses && (ses->server))
 855                 server = ses->server;
 856         else
 857                 return -EIO;
 858
 859         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
 860                 return 0;
 861
 862         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
 863         if (rc)
 864                 return rc;
 865
 866         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
 867         if (rc)
 868                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
 869
 870         return rc;
 871 }
 872
 873 static struct create_lease *
 874 create_lease_buf(u8 *lease_key, u8 oplock)
 875 {
 876         struct create_lease *buf;
 877
 878         buf = kmalloc(sizeof(struct create_lease), GFP_KERNEL);
 879         if (!buf)
 880                 return NULL;
 881
 882         memset(buf, 0, sizeof(struct create_lease));
 883
 884         buf->lcontext.LeaseKeyLow = cpu_to_le64(*((u64 *)lease_key));
 885         buf->lcontext.LeaseKeyHigh = cpu_to_le64(*((u64 *)(lease_key + 8)));
 886         if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE)
 887                 buf->lcontext.LeaseState = SMB2_LEASE_WRITE_CACHING |
 888                                            SMB2_LEASE_READ_CACHING;
 889         else if (oplock == SMB2_OPLOCK_LEVEL_II)
 890                 buf->lcontext.LeaseState = SMB2_LEASE_READ_CACHING;
 891         else if (oplock == SMB2_OPLOCK_LEVEL_BATCH)
 892                 buf->lcontext.LeaseState = SMB2_LEASE_HANDLE_CACHING |
 893                                            SMB2_LEASE_READ_CACHING |
 894                                            SMB2_LEASE_WRITE_CACHING;
 895
 896         buf->ccontext.DataOffset = cpu_to_le16(offsetof
 897                                         (struct create_lease, lcontext));
 898         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct lease_context));
 899         buf->ccontext.NameOffset = cpu_to_le16(offsetof
 900                                 (struct create_lease, Name));
 901         buf->ccontext.NameLength = cpu_to_le16(4);
 902         buf->Name[0] = 'R';
 903         buf->Name[1] = 'q';
 904         buf->Name[2] = 'L';
 905         buf->Name[3] = 's';
 906         return buf;
 907 }
 908
 909 static __u8
 910 parse_lease_state(struct smb2_create_rsp *rsp)
 911 {
 912         char *data_offset;
 913         struct create_lease *lc;
 914         __u8 oplock = 0;
 915         bool found = false;
 916
 917         data_offset = (char *)rsp;
 918         data_offset += 4 + le32_to_cpu(rsp->CreateContextsOffset);
 919         lc = (struct create_lease *)data_offset;
 920         do {
 921                 char *name = le16_to_cpu(lc->ccontext.NameOffset) + (char *)lc;
 922                 if (le16_to_cpu(lc->ccontext.NameLength) != 4 ||
 923                     strncmp(name, "RqLs", 4)) {
 924                         lc = (struct create_lease *)((char *)lc
 925                                         + le32_to_cpu(lc->ccontext.Next));
 926                         continue;
 927                 }
 928                 if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
 929                         return SMB2_OPLOCK_LEVEL_NOCHANGE;
 930                 found = true;
 931                 break;
 932         } while (le32_to_cpu(lc->ccontext.Next) != 0);
 933
 934         if (!found)
 935                 return oplock;
 936
 937         if (le32_to_cpu(lc->lcontext.LeaseState) & SMB2_LEASE_WRITE_CACHING) {
 938                 if (le32_to_cpu(lc->lcontext.LeaseState) &
 939                                                 SMB2_LEASE_HANDLE_CACHING)
 940                         oplock = SMB2_OPLOCK_LEVEL_BATCH;
 941                 else
 942                         oplock = SMB2_OPLOCK_LEVEL_EXCLUSIVE;
 943         } else if (le32_to_cpu(lc->lcontext.LeaseState) &
 944                                                 SMB2_LEASE_READ_CACHING)
 945                 oplock = SMB2_OPLOCK_LEVEL_II;
 946
 947         return oplock;
 948 }
 949
 950 int
 951 SMB2_open(const unsigned int xid, struct cifs_tcon *tcon, __le16 *path,
 952           u64 *persistent_fid, u64 *volatile_fid, __u32 desired_access,
 953           __u32 create_disposition, __u32 file_attributes, __u32 create_options,
 954           __u8 *oplock, struct smb2_file_all_info *buf)
 955 {
 956         struct smb2_create_req *req;
 957         struct smb2_create_rsp *rsp;
 958         struct TCP_Server_Info *server;
 959         struct cifs_ses *ses = tcon->ses;
 960         struct kvec iov[3];
 961         int resp_buftype;
 962         int uni_path_len;
 963         __le16 *copy_path = NULL;
 964         int copy_size;
 965         int rc = 0;
 966         int num_iovecs = 2;
 967
 968         cFYI(1, "create/open");
 969
 970         if (ses && (ses->server))
 971                 server = ses->server;
 972         else
 973                 return -EIO;
 974
 975         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
 976         if (rc)
 977                 return rc;
 978
 979         req->ImpersonationLevel = IL_IMPERSONATION;
 980         req->DesiredAccess = cpu_to_le32(desired_access);
 981         /* File attributes ignored on open (used in create though) */
 982         req->FileAttributes = cpu_to_le32(file_attributes);
 983         req->ShareAccess = FILE_SHARE_ALL_LE;
 984         req->CreateDisposition = cpu_to_le32(create_disposition);
 985         req->CreateOptions = cpu_to_le32(create_options);
 986         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
 987         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req)
 988                         - 8 /* pad */ - 4 /* do not count rfc1001 len field */);
 989
 990         iov[0].iov_base = (char *)req;
 991         /* 4 for rfc1002 length field */
 992         iov[0].iov_len = get_rfc1002_length(req) + 4;
 993
 994         /* MUST set path len (NameLength) to 0 opening root of share */
 995         if (uni_path_len >= 4) {
 996                 req->NameLength = cpu_to_le16(uni_path_len - 2);
 997                 /* -1 since last byte is buf[0] which is sent below (path) */
 998                 iov[0].iov_len--;
 999                 if (uni_path_len % 8 != 0) {
1000                         copy_size = uni_path_len / 8 * 8;
1001                         if (copy_size < uni_path_len)
1002                                 copy_size += 8;
1003
1004                         copy_path = kzalloc(copy_size, GFP_KERNEL);
1005                         if (!copy_path)
1006                                 return -ENOMEM;
1007                         memcpy((char *)copy_path, (const char *)path,
1008                                 uni_path_len);
1009                         uni_path_len = copy_size;
1010                         path = copy_path;
1011                 }
1012
1013                 iov[1].iov_len = uni_path_len;
1014                 iov[1].iov_base = path;
1015                 /*
1016                  * -1 since last byte is buf[0] which was counted in
1017                  * smb2_buf_len.
1018                  */
1019                 inc_rfc1001_len(req, uni_path_len - 1);
1020         } else {
1021                 iov[0].iov_len += 7;
1022                 req->hdr.smb2_buf_length = cpu_to_be32(be32_to_cpu(
1023                                 req->hdr.smb2_buf_length) + 8 - 1);
1024                 num_iovecs = 1;
1025                 req->NameLength = 0;
1026         }
1027
1028         if (!server->oplocks)
1029                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1030
1031         if (!(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1032             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1033                 req->RequestedOplockLevel = *oplock;
1034         else {
1035                 iov[num_iovecs].iov_base = create_lease_buf(oplock+1, *oplock);
1036                 if (iov[num_iovecs].iov_base == NULL) {
1037                         cifs_small_buf_release(req);
1038                         kfree(copy_path);
1039                         return -ENOMEM;
1040                 }
1041                 iov[num_iovecs].iov_len = sizeof(struct create_lease);
1042                 req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1043                 req->CreateContextsOffset = cpu_to_le32(
1044                         sizeof(struct smb2_create_req) - 4 - 8 +
1045                         iov[num_iovecs-1].iov_len);
1046                 req->CreateContextsLength = cpu_to_le32(
1047                         sizeof(struct create_lease));
1048                 inc_rfc1001_len(&req->hdr, sizeof(struct create_lease));
1049                 num_iovecs++;
1050         }
1051
1052         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1053         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1054
1055         if (rc != 0) {
1056                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1057                 goto creat_exit;
1058         }
1059
1060         if (rsp == NULL) {
1061                 rc = -EIO;
1062                 goto creat_exit;
1063         }
1064         *persistent_fid = rsp->PersistentFileId;
1065         *volatile_fid = rsp->VolatileFileId;
1066
1067         if (buf) {
1068                 memcpy(buf, &rsp->CreationTime, 32);
1069                 buf->AllocationSize = rsp->AllocationSize;
1070                 buf->EndOfFile = rsp->EndofFile;
1071                 buf->Attributes = rsp->FileAttributes;
1072                 buf->NumberOfLinks = cpu_to_le32(1);
1073                 buf->DeletePending = 0;
1074         }
1075
1076         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1077                 *oplock = parse_lease_state(rsp);
1078         else
1079                 *oplock = rsp->OplockLevel;
1080 creat_exit:
1081         kfree(copy_path);
1082         free_rsp_buf(resp_buftype, rsp);
1083         return rc;
1084 }
1085
1086 int
1087 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1088            u64 persistent_fid, u64 volatile_fid)
1089 {
1090         struct smb2_close_req *req;
1091         struct smb2_close_rsp *rsp;
1092         struct TCP_Server_Info *server;
1093         struct cifs_ses *ses = tcon->ses;
1094         struct kvec iov[1];
1095         int resp_buftype;
1096         int rc = 0;
1097
1098         cFYI(1, "Close");
1099
1100         if (ses && (ses->server))
1101                 server = ses->server;
1102         else
1103                 return -EIO;
1104
1105         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1106         if (rc)
1107                 return rc;
1108
1109         req->PersistentFileId = persistent_fid;
1110         req->VolatileFileId = volatile_fid;
1111
1112         iov[0].iov_base = (char *)req;
1113         /* 4 for rfc1002 length field */
1114         iov[0].iov_len = get_rfc1002_length(req) + 4;
1115
1116         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1117         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1118
1119         if (rc != 0) {
1120                 if (tcon)
1121                         cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1122                 goto close_exit;
1123         }
1124
1125         if (rsp == NULL) {
1126                 rc = -EIO;
1127                 goto close_exit;
1128         }
1129
1130         /* BB FIXME - decode close response, update inode for caching */
1131
1132 close_exit:
1133         free_rsp_buf(resp_buftype, rsp);
1134         return rc;
1135 }
1136
1137 static int
1138 validate_buf(unsigned int offset, unsigned int buffer_length,
1139              struct smb2_hdr *hdr, unsigned int min_buf_size)
1140
1141 {
1142         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1143         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1144         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1145         char *end_of_buf = begin_of_buf + buffer_length;
1146
1147
1148         if (buffer_length < min_buf_size) {
1149                 cERROR(1, "buffer length %d smaller than minimum size %d",
1150                            buffer_length, min_buf_size);
1151                 return -EINVAL;
1152         }
1153
1154         /* check if beyond RFC1001 maximum length */
1155         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1156                 cERROR(1, "buffer length %d or smb length %d too large",
1157                            buffer_length, smb_len);
1158                 return -EINVAL;
1159         }
1160
1161         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1162                 cERROR(1, "illegal server response, bad offset to data");
1163                 return -EINVAL;
1164         }
1165
1166         return 0;
1167 }
1168
1169 /*
1170  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1171  * Caller must free buffer.
1172  */
1173 static int
1174 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1175                       struct smb2_hdr *hdr, unsigned int minbufsize,
1176                       char *data)
1177
1178 {
1179         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1180         int rc;
1181
1182         if (!data)
1183                 return -EINVAL;
1184
1185         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1186         if (rc)
1187                 return rc;
1188
1189         memcpy(data, begin_of_buf, buffer_length);
1190
1191         return 0;
1192 }
1193
1194 static int
1195 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1196            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1197            size_t output_len, size_t min_len, void *data)
1198 {
1199         struct smb2_query_info_req *req;
1200         struct smb2_query_info_rsp *rsp = NULL;
1201         struct kvec iov[2];
1202         int rc = 0;
1203         int resp_buftype;
1204         struct TCP_Server_Info *server;
1205         struct cifs_ses *ses = tcon->ses;
1206
1207         cFYI(1, "Query Info");
1208
1209         if (ses && (ses->server))
1210                 server = ses->server;
1211         else
1212                 return -EIO;
1213
1214         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1215         if (rc)
1216                 return rc;
1217
1218         req->InfoType = SMB2_O_INFO_FILE;
1219         req->FileInfoClass = info_class;
1220         req->PersistentFileId = persistent_fid;
1221         req->VolatileFileId = volatile_fid;
1222         /* 4 for rfc1002 length field and 1 for Buffer */
1223         req->InputBufferOffset =
1224                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1225         req->OutputBufferLength = cpu_to_le32(output_len);
1226
1227         iov[0].iov_base = (char *)req;
1228         /* 4 for rfc1002 length field */
1229         iov[0].iov_len = get_rfc1002_length(req) + 4;
1230
1231         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1232         if (rc) {
1233                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1234                 goto qinf_exit;
1235         }
1236
1237         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1238
1239         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1240                                    le32_to_cpu(rsp->OutputBufferLength),
1241                                    &rsp->hdr, min_len, data);
1242
1243 qinf_exit:
1244         free_rsp_buf(resp_buftype, rsp);
1245         return rc;
1246 }
1247
1248 int
1249 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1250                 u64 persistent_fid, u64 volatile_fid,
1251                 struct smb2_file_all_info *data)
1252 {
1253         return query_info(xid, tcon, persistent_fid, volatile_fid,
1254                           FILE_ALL_INFORMATION,
1255                           sizeof(struct smb2_file_all_info) + MAX_NAME * 2,
1256                           sizeof(struct smb2_file_all_info), data);
1257 }
1258
1259 int
1260 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1261                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1262 {
1263         return query_info(xid, tcon, persistent_fid, volatile_fid,
1264                           FILE_INTERNAL_INFORMATION,
1265                           sizeof(struct smb2_file_internal_info),
1266                           sizeof(struct smb2_file_internal_info), uniqueid);
1267 }
1268
1269 /*
1270  * This is a no-op for now. We're not really interested in the reply, but
1271  * rather in the fact that the server sent one and that server->lstrp
1272  * gets updated.
1273  *
1274  * FIXME: maybe we should consider checking that the reply matches request?
1275  */
1276 static void
1277 smb2_echo_callback(struct mid_q_entry *mid)
1278 {
1279         struct TCP_Server_Info *server = mid->callback_data;
1280         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1281         unsigned int credits_received = 1;
1282
1283         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1284                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1285
1286         DeleteMidQEntry(mid);
1287         add_credits(server, credits_received, CIFS_ECHO_OP);
1288 }
1289
1290 int
1291 SMB2_echo(struct TCP_Server_Info *server)
1292 {
1293         struct smb2_echo_req *req;
1294         int rc = 0;
1295         struct kvec iov;
1296         struct smb_rqst rqst = { .rq_iov = &iov,
1297                                  .rq_nvec = 1 };
1298
1299         cFYI(1, "In echo request");
1300
1301         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1302         if (rc)
1303                 return rc;
1304
1305         req->hdr.CreditRequest = cpu_to_le16(1);
1306
1307         iov.iov_base = (char *)req;
1308         /* 4 for rfc1002 length field */
1309         iov.iov_len = get_rfc1002_length(req) + 4;
1310
1311         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1312                              CIFS_ECHO_OP);
1313         if (rc)
1314                 cFYI(1, "Echo request failed: %d", rc);
1315
1316         cifs_small_buf_release(req);
1317         return rc;
1318 }
1319
1320 int
1321 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1322            u64 volatile_fid)
1323 {
1324         struct smb2_flush_req *req;
1325         struct TCP_Server_Info *server;
1326         struct cifs_ses *ses = tcon->ses;
1327         struct kvec iov[1];
1328         int resp_buftype;
1329         int rc = 0;
1330
1331         cFYI(1, "Flush");
1332
1333         if (ses && (ses->server))
1334                 server = ses->server;
1335         else
1336                 return -EIO;
1337
1338         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1339         if (rc)
1340                 return rc;
1341
1342         req->PersistentFileId = persistent_fid;
1343         req->VolatileFileId = volatile_fid;
1344
1345         iov[0].iov_base = (char *)req;
1346         /* 4 for rfc1002 length field */
1347         iov[0].iov_len = get_rfc1002_length(req) + 4;
1348
1349         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1350
1351         if ((rc != 0) && tcon)
1352                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1353
1354         free_rsp_buf(resp_buftype, iov[0].iov_base);
1355         return rc;
1356 }
1357
1358 /*
1359  * To form a chain of read requests, any read requests after the first should
1360  * have the end_of_chain boolean set to true.
1361  */
1362 static int
1363 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1364                   unsigned int remaining_bytes, int request_type)
1365 {
1366         int rc = -EACCES;
1367         struct smb2_read_req *req = NULL;
1368
1369         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1370         if (rc)
1371                 return rc;
1372         if (io_parms->tcon->ses->server == NULL)
1373                 return -ECONNABORTED;
1374
1375         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1376
1377         req->PersistentFileId = io_parms->persistent_fid;
1378         req->VolatileFileId = io_parms->volatile_fid;
1379         req->ReadChannelInfoOffset = 0; /* reserved */
1380         req->ReadChannelInfoLength = 0; /* reserved */
1381         req->Channel = 0; /* reserved */
1382         req->MinimumCount = 0;
1383         req->Length = cpu_to_le32(io_parms->length);
1384         req->Offset = cpu_to_le64(io_parms->offset);
1385
1386         if (request_type & CHAINED_REQUEST) {
1387                 if (!(request_type & END_OF_CHAIN)) {
1388                         /* 4 for rfc1002 length field */
1389                         req->hdr.NextCommand =
1390                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1391                 } else /* END_OF_CHAIN */
1392                         req->hdr.NextCommand = 0;
1393                 if (request_type & RELATED_REQUEST) {
1394                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1395                         /*
1396                          * Related requests use info from previous read request
1397                          * in chain.
1398                          */
1399                         req->hdr.SessionId = 0xFFFFFFFF;
1400                         req->hdr.TreeId = 0xFFFFFFFF;
1401                         req->PersistentFileId = 0xFFFFFFFF;
1402                         req->VolatileFileId = 0xFFFFFFFF;
1403                 }
1404         }
1405         if (remaining_bytes > io_parms->length)
1406                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1407         else
1408                 req->RemainingBytes = 0;
1409
1410         iov[0].iov_base = (char *)req;
1411         /* 4 for rfc1002 length field */
1412         iov[0].iov_len = get_rfc1002_length(req) + 4;
1413         return rc;
1414 }
1415
1416 static void
1417 smb2_readv_callback(struct mid_q_entry *mid)
1418 {
1419         struct cifs_readdata *rdata = mid->callback_data;
1420         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1421         struct TCP_Server_Info *server = tcon->ses->server;
1422         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1423         unsigned int credits_received = 1;
1424         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1425                                  .rq_nvec = 1,
1426                                  .rq_pages = rdata->pages,
1427                                  .rq_npages = rdata->nr_pages,
1428                                  .rq_pagesz = rdata->pagesz,
1429                                  .rq_tailsz = rdata->tailsz };
1430
1431         cFYI(1, "%s: mid=%llu state=%d result=%d bytes=%u", __func__,
1432                 mid->mid, mid->mid_state, rdata->result, rdata->bytes);
1433
1434         switch (mid->mid_state) {
1435         case MID_RESPONSE_RECEIVED:
1436                 credits_received = le16_to_cpu(buf->CreditRequest);
1437                 /* result already set, check signature */
1438                 if (server->sec_mode &
1439                     (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
1440                         int rc;
1441
1442                         rc = smb2_verify_signature(&rqst, server);
1443                         if (rc)
1444                                 cERROR(1, "SMB signature verification returned "
1445                                        "error = %d", rc);
1446                 }
1447                 /* FIXME: should this be counted toward the initiating task? */
1448                 task_io_account_read(rdata->bytes);
1449                 cifs_stats_bytes_read(tcon, rdata->bytes);
1450                 break;
1451         case MID_REQUEST_SUBMITTED:
1452         case MID_RETRY_NEEDED:
1453                 rdata->result = -EAGAIN;
1454                 break;
1455         default:
1456                 if (rdata->result != -ENODATA)
1457                         rdata->result = -EIO;
1458         }
1459
1460         if (rdata->result)
1461                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1462
1463         queue_work(cifsiod_wq, &rdata->work);
1464         DeleteMidQEntry(mid);
1465         add_credits(server, credits_received, 0);
1466 }
1467
1468 /* smb2_async_readv - send an async write, and set up mid to handle result */
1469 int
1470 smb2_async_readv(struct cifs_readdata *rdata)
1471 {
1472         int rc;
1473         struct smb2_hdr *buf;
1474         struct cifs_io_parms io_parms;
1475         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1476                                  .rq_nvec = 1 };
1477
1478         cFYI(1, "%s: offset=%llu bytes=%u", __func__,
1479                 rdata->offset, rdata->bytes);
1480
1481         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1482         io_parms.offset = rdata->offset;
1483         io_parms.length = rdata->bytes;
1484         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1485         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1486         io_parms.pid = rdata->pid;
1487         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1488         if (rc)
1489                 return rc;
1490
1491         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1492         /* 4 for rfc1002 length field */
1493         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1494
1495         kref_get(&rdata->refcount);
1496         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1497                              cifs_readv_receive, smb2_readv_callback,
1498                              rdata, 0);
1499         if (rc)
1500                 kref_put(&rdata->refcount, cifs_readdata_release);
1501
1502         cifs_small_buf_release(buf);
1503         return rc;
1504 }
1505
1506 int
1507 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1508           unsigned int *nbytes, char **buf, int *buf_type)
1509 {
1510         int resp_buftype, rc = -EACCES;
1511         struct smb2_read_rsp *rsp = NULL;
1512         struct kvec iov[1];
1513
1514         *nbytes = 0;
1515         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1516         if (rc)
1517                 return rc;
1518
1519         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1520                           &resp_buftype, CIFS_LOG_ERROR);
1521
1522         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1523
1524         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1525                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1526                 return 0;
1527         }
1528
1529         if (rc) {
1530                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1531                 cERROR(1, "Send error in read = %d", rc);
1532         } else {
1533                 *nbytes = le32_to_cpu(rsp->DataLength);
1534                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1535                     (*nbytes > io_parms->length)) {
1536                         cFYI(1, "bad length %d for count %d", *nbytes,
1537                                 io_parms->length);
1538                         rc = -EIO;
1539                         *nbytes = 0;
1540                 }
1541         }
1542
1543         if (*buf) {
1544                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1545                        *nbytes);
1546                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1547         } else if (resp_buftype != CIFS_NO_BUFFER) {
1548                 *buf = iov[0].iov_base;
1549                 if (resp_buftype == CIFS_SMALL_BUFFER)
1550                         *buf_type = CIFS_SMALL_BUFFER;
1551                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1552                         *buf_type = CIFS_LARGE_BUFFER;
1553         }
1554         return rc;
1555 }
1556
1557 /*
1558  * Check the mid_state and signature on received buffer (if any), and queue the
1559  * workqueue completion task.
1560  */
1561 static void
1562 smb2_writev_callback(struct mid_q_entry *mid)
1563 {
1564         struct cifs_writedata *wdata = mid->callback_data;
1565         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1566         unsigned int written;
1567         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
1568         unsigned int credits_received = 1;
1569
1570         switch (mid->mid_state) {
1571         case MID_RESPONSE_RECEIVED:
1572                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
1573                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
1574                 if (wdata->result != 0)
1575                         break;
1576
1577                 written = le32_to_cpu(rsp->DataLength);
1578                 /*
1579                  * Mask off high 16 bits when bytes written as returned
1580                  * by the server is greater than bytes requested by the
1581                  * client. OS/2 servers are known to set incorrect
1582                  * CountHigh values.
1583                  */
1584                 if (written > wdata->bytes)
1585                         written &= 0xFFFF;
1586
1587                 if (written < wdata->bytes)
1588                         wdata->result = -ENOSPC;
1589                 else
1590                         wdata->bytes = written;
1591                 break;
1592         case MID_REQUEST_SUBMITTED:
1593         case MID_RETRY_NEEDED:
1594                 wdata->result = -EAGAIN;
1595                 break;
1596         default:
1597                 wdata->result = -EIO;
1598                 break;
1599         }
1600
1601         if (wdata->result)
1602                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
1603
1604         queue_work(cifsiod_wq, &wdata->work);
1605         DeleteMidQEntry(mid);
1606         add_credits(tcon->ses->server, credits_received, 0);
1607 }
1608
1609 /* smb2_async_writev - send an async write, and set up mid to handle result */
1610 int
1611 smb2_async_writev(struct cifs_writedata *wdata)
1612 {
1613         int rc = -EACCES;
1614         struct smb2_write_req *req = NULL;
1615         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1616         struct kvec iov;
1617         struct smb_rqst rqst;
1618
1619         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
1620         if (rc)
1621                 goto async_writev_out;
1622
1623         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
1624
1625         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
1626         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
1627         req->WriteChannelInfoOffset = 0;
1628         req->WriteChannelInfoLength = 0;
1629         req->Channel = 0;
1630         req->Offset = cpu_to_le64(wdata->offset);
1631         /* 4 for rfc1002 length field */
1632         req->DataOffset = cpu_to_le16(
1633                                 offsetof(struct smb2_write_req, Buffer) - 4);
1634         req->RemainingBytes = 0;
1635
1636         /* 4 for rfc1002 length field and 1 for Buffer */
1637         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
1638         iov.iov_base = req;
1639
1640         rqst.rq_iov = &iov;
1641         rqst.rq_nvec = 1;
1642         rqst.rq_pages = wdata->pages;
1643         rqst.rq_npages = wdata->nr_pages;
1644         rqst.rq_pagesz = wdata->pagesz;
1645         rqst.rq_tailsz = wdata->tailsz;
1646
1647         cFYI(1, "async write at %llu %u bytes", wdata->offset, wdata->bytes);
1648
1649         req->Length = cpu_to_le32(wdata->bytes);
1650
1651         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
1652
1653         kref_get(&wdata->refcount);
1654         rc = cifs_call_async(tcon->ses->server, &rqst, NULL,
1655                                 smb2_writev_callback, wdata, 0);
1656
1657         if (rc)
1658                 kref_put(&wdata->refcount, cifs_writedata_release);
1659
1660 async_writev_out:
1661         cifs_small_buf_release(req);
1662         return rc;
1663 }
1664
1665 /*
1666  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
1667  * The length field from io_parms must be at least 1 and indicates a number of
1668  * elements with data to write that begins with position 1 in iov array. All
1669  * data length is specified by count.
1670  */
1671 int
1672 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
1673            unsigned int *nbytes, struct kvec *iov, int n_vec)
1674 {
1675         int rc = 0;
1676         struct smb2_write_req *req = NULL;
1677         struct smb2_write_rsp *rsp = NULL;
1678         int resp_buftype;
1679         *nbytes = 0;
1680
1681         if (n_vec < 1)
1682                 return rc;
1683
1684         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
1685         if (rc)
1686                 return rc;
1687
1688         if (io_parms->tcon->ses->server == NULL)
1689                 return -ECONNABORTED;
1690
1691         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1692
1693         req->PersistentFileId = io_parms->persistent_fid;
1694         req->VolatileFileId = io_parms->volatile_fid;
1695         req->WriteChannelInfoOffset = 0;
1696         req->WriteChannelInfoLength = 0;
1697         req->Channel = 0;
1698         req->Length = cpu_to_le32(io_parms->length);
1699         req->Offset = cpu_to_le64(io_parms->offset);
1700         /* 4 for rfc1002 length field */
1701         req->DataOffset = cpu_to_le16(
1702                                 offsetof(struct smb2_write_req, Buffer) - 4);
1703         req->RemainingBytes = 0;
1704
1705         iov[0].iov_base = (char *)req;
1706         /* 4 for rfc1002 length field and 1 for Buffer */
1707         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1708
1709         /* length of entire message including data to be written */
1710         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
1711
1712         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
1713                           &resp_buftype, 0);
1714
1715         if (rc) {
1716                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
1717                 cERROR(1, "Send error in write = %d", rc);
1718         } else {
1719                 rsp = (struct smb2_write_rsp *)iov[0].iov_base;
1720                 *nbytes = le32_to_cpu(rsp->DataLength);
1721                 free_rsp_buf(resp_buftype, rsp);
1722         }
1723         return rc;
1724 }
1725
1726 static unsigned int
1727 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
1728 {
1729         int len;
1730         unsigned int entrycount = 0;
1731         unsigned int next_offset = 0;
1732         FILE_DIRECTORY_INFO *entryptr;
1733
1734         if (bufstart == NULL)
1735                 return 0;
1736
1737         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
1738
1739         while (1) {
1740                 entryptr = (FILE_DIRECTORY_INFO *)
1741                                         ((char *)entryptr + next_offset);
1742
1743                 if ((char *)entryptr + size > end_of_buf) {
1744                         cERROR(1, "malformed search entry would overflow");
1745                         break;
1746                 }
1747
1748                 len = le32_to_cpu(entryptr->FileNameLength);
1749                 if ((char *)entryptr + len + size > end_of_buf) {
1750                         cERROR(1, "directory entry name would overflow frame "
1751                                   "end of buf %p", end_of_buf);
1752                         break;
1753                 }
1754
1755                 *lastentry = (char *)entryptr;
1756                 entrycount++;
1757
1758                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
1759                 if (!next_offset)
1760                         break;
1761         }
1762
1763         return entrycount;
1764 }
1765
1766 /*
1767  * Readdir/FindFirst
1768  */
1769 int
1770 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
1771                      u64 persistent_fid, u64 volatile_fid, int index,
1772                      struct cifs_search_info *srch_inf)
1773 {
1774         struct smb2_query_directory_req *req;
1775         struct smb2_query_directory_rsp *rsp = NULL;
1776         struct kvec iov[2];
1777         int rc = 0;
1778         int len;
1779         int resp_buftype;
1780         unsigned char *bufptr;
1781         struct TCP_Server_Info *server;
1782         struct cifs_ses *ses = tcon->ses;
1783         __le16 asteriks = cpu_to_le16('*');
1784         char *end_of_smb;
1785         unsigned int output_size = CIFSMaxBufSize;
1786         size_t info_buf_size;
1787
1788         if (ses && (ses->server))
1789                 server = ses->server;
1790         else
1791                 return -EIO;
1792
1793         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
1794         if (rc)
1795                 return rc;
1796
1797         switch (srch_inf->info_level) {
1798         case SMB_FIND_FILE_DIRECTORY_INFO:
1799                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
1800                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
1801                 break;
1802         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
1803                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
1804                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
1805                 break;
1806         default:
1807                 cERROR(1, "info level %u isn't supported",
1808                        srch_inf->info_level);
1809                 rc = -EINVAL;
1810                 goto qdir_exit;
1811         }
1812
1813         req->FileIndex = cpu_to_le32(index);
1814         req->PersistentFileId = persistent_fid;
1815         req->VolatileFileId = volatile_fid;
1816
1817         len = 0x2;
1818         bufptr = req->Buffer;
1819         memcpy(bufptr, &asteriks, len);
1820
1821         req->FileNameOffset =
1822                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
1823         req->FileNameLength = cpu_to_le16(len);
1824         /*
1825          * BB could be 30 bytes or so longer if we used SMB2 specific
1826          * buffer lengths, but this is safe and close enough.
1827          */
1828         output_size = min_t(unsigned int, output_size, server->maxBuf);
1829         output_size = min_t(unsigned int, output_size, 2 << 15);
1830         req->OutputBufferLength = cpu_to_le32(output_size);
1831
1832         iov[0].iov_base = (char *)req;
1833         /* 4 for RFC1001 length and 1 for Buffer */
1834         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1835
1836         iov[1].iov_base = (char *)(req->Buffer);
1837         iov[1].iov_len = len;
1838
1839         inc_rfc1001_len(req, len - 1 /* Buffer */);
1840
1841         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
1842         if (rc) {
1843                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
1844                 goto qdir_exit;
1845         }
1846         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
1847
1848         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
1849                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
1850                           info_buf_size);
1851         if (rc)
1852                 goto qdir_exit;
1853
1854         srch_inf->unicode = true;
1855
1856         if (srch_inf->ntwrk_buf_start) {
1857                 if (srch_inf->smallBuf)
1858                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
1859                 else
1860                         cifs_buf_release(srch_inf->ntwrk_buf_start);
1861         }
1862         srch_inf->ntwrk_buf_start = (char *)rsp;
1863         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
1864                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
1865         /* 4 for rfc1002 length field */
1866         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
1867         srch_inf->entries_in_buffer =
1868                         num_entries(srch_inf->srch_entries_start, end_of_smb,
1869                                     &srch_inf->last_entry, info_buf_size);
1870         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
1871         cFYI(1, "num entries %d last_index %lld srch start %p srch end %p",
1872                 srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
1873                 srch_inf->srch_entries_start, srch_inf->last_entry);
1874         if (resp_buftype == CIFS_LARGE_BUFFER)
1875                 srch_inf->smallBuf = false;
1876         else if (resp_buftype == CIFS_SMALL_BUFFER)
1877                 srch_inf->smallBuf = true;
1878         else
1879                 cERROR(1, "illegal search buffer type");
1880
1881         if (rsp->hdr.Status == STATUS_NO_MORE_FILES)
1882                 srch_inf->endOfSearch = 1;
1883         else
1884                 srch_inf->endOfSearch = 0;
1885
1886         return rc;
1887
1888 qdir_exit:
1889         free_rsp_buf(resp_buftype, rsp);
1890         return rc;
1891 }
1892
1893 static int
1894 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
1895                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
1896                unsigned int num, void **data, unsigned int *size)
1897 {
1898         struct smb2_set_info_req *req;
1899         struct smb2_set_info_rsp *rsp = NULL;
1900         struct kvec *iov;
1901         int rc = 0;
1902         int resp_buftype;
1903         unsigned int i;
1904         struct TCP_Server_Info *server;
1905         struct cifs_ses *ses = tcon->ses;
1906
1907         if (ses && (ses->server))
1908                 server = ses->server;
1909         else
1910                 return -EIO;
1911
1912         if (!num)
1913                 return -EINVAL;
1914
1915         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
1916         if (!iov)
1917                 return -ENOMEM;
1918
1919         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
1920         if (rc) {
1921                 kfree(iov);
1922                 return rc;
1923         }
1924
1925         req->hdr.ProcessId = cpu_to_le32(pid);
1926
1927         req->InfoType = SMB2_O_INFO_FILE;
1928         req->FileInfoClass = info_class;
1929         req->PersistentFileId = persistent_fid;
1930         req->VolatileFileId = volatile_fid;
1931
1932         /* 4 for RFC1001 length and 1 for Buffer */
1933         req->BufferOffset =
1934                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
1935         req->BufferLength = cpu_to_le32(*size);
1936
1937         inc_rfc1001_len(req, *size - 1 /* Buffer */);
1938
1939         memcpy(req->Buffer, *data, *size);
1940
1941         iov[0].iov_base = (char *)req;
1942         /* 4 for RFC1001 length */
1943         iov[0].iov_len = get_rfc1002_length(req) + 4;
1944
1945         for (i = 1; i < num; i++) {
1946                 inc_rfc1001_len(req, size[i]);
1947                 le32_add_cpu(&req->BufferLength, size[i]);
1948                 iov[i].iov_base = (char *)data[i];
1949                 iov[i].iov_len = size[i];
1950         }
1951
1952         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
1953         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
1954
1955         if (rc != 0) {
1956                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
1957                 goto out;
1958         }
1959
1960         if (rsp == NULL) {
1961                 rc = -EIO;
1962                 goto out;
1963         }
1964
1965 out:
1966         free_rsp_buf(resp_buftype, rsp);
1967         kfree(iov);
1968         return rc;
1969 }
1970
1971 int
1972 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
1973             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
1974 {
1975         struct smb2_file_rename_info info;
1976         void **data;
1977         unsigned int size[2];
1978         int rc;
1979         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
1980
1981         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
1982         if (!data)
1983                 return -ENOMEM;
1984
1985         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
1986                               /* 0 = fail if target already exists */
1987         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
1988         info.FileNameLength = cpu_to_le32(len);
1989
1990         data[0] = &info;
1991         size[0] = sizeof(struct smb2_file_rename_info);
1992
1993         data[1] = target_file;
1994         size[1] = len + 2 /* null */;
1995
1996         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
1997                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
1998                            size);
1999         kfree(data);
2000         return rc;
2001 }
2002
2003 int
2004 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2005                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2006 {
2007         struct smb2_file_link_info info;
2008         void **data;
2009         unsigned int size[2];
2010         int rc;
2011         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2012
2013         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2014         if (!data)
2015                 return -ENOMEM;
2016
2017         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2018                               /* 0 = fail if link already exists */
2019         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2020         info.FileNameLength = cpu_to_le32(len);
2021
2022         data[0] = &info;
2023         size[0] = sizeof(struct smb2_file_link_info);
2024
2025         data[1] = target_file;
2026         size[1] = len + 2 /* null */;
2027
2028         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2029                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2030         kfree(data);
2031         return rc;
2032 }
2033
2034 int
2035 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2036              u64 volatile_fid, u32 pid, __le64 *eof)
2037 {
2038         struct smb2_file_eof_info info;
2039         void *data;
2040         unsigned int size;
2041
2042         info.EndOfFile = *eof;
2043
2044         data = &info;
2045         size = sizeof(struct smb2_file_eof_info);
2046
2047         return send_set_info(xid, tcon, persistent_fid, volatile_fid, pid,
2048                              FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2049 }
2050
2051 int
2052 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2053               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2054 {
2055         unsigned int size;
2056         size = sizeof(FILE_BASIC_INFO);
2057         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2058                              current->tgid, FILE_BASIC_INFORMATION, 1,
2059                              (void **)&buf, &size);
2060 }
2061
2062 int
2063 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2064                   const u64 persistent_fid, const u64 volatile_fid,
2065                   __u8 oplock_level)
2066 {
2067         int rc;
2068         struct smb2_oplock_break *req = NULL;
2069
2070         cFYI(1, "SMB2_oplock_break");
2071         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2072
2073         if (rc)
2074                 return rc;
2075
2076         req->VolatileFid = volatile_fid;
2077         req->PersistentFid = persistent_fid;
2078         req->OplockLevel = oplock_level;
2079         req->hdr.CreditRequest = cpu_to_le16(1);
2080
2081         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2082         /* SMB2 buffer freed by function above */
2083
2084         if (rc) {
2085                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2086                 cFYI(1, "Send error in Oplock Break = %d", rc);
2087         }
2088
2089         return rc;
2090 }
2091
2092 static void
2093 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2094                         struct kstatfs *kst)
2095 {
2096         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2097                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2098         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2099         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2100         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2101         return;
2102 }
2103
2104 static int
2105 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2106                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2107 {
2108         int rc;
2109         struct smb2_query_info_req *req;
2110
2111         cFYI(1, "Query FSInfo level %d", level);
2112
2113         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2114                 return -EIO;
2115
2116         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2117         if (rc)
2118                 return rc;
2119
2120         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2121         req->FileInfoClass = level;
2122         req->PersistentFileId = persistent_fid;
2123         req->VolatileFileId = volatile_fid;
2124         /* 4 for rfc1002 length field and 1 for pad */
2125         req->InputBufferOffset =
2126                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2127         req->OutputBufferLength = cpu_to_le32(
2128                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2129
2130         iov->iov_base = (char *)req;
2131         /* 4 for rfc1002 length field */
2132         iov->iov_len = get_rfc1002_length(req) + 4;
2133         return 0;
2134 }
2135
2136 int
2137 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2138               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2139 {
2140         struct smb2_query_info_rsp *rsp = NULL;
2141         struct kvec iov;
2142         int rc = 0;
2143         int resp_buftype;
2144         struct cifs_ses *ses = tcon->ses;
2145         struct smb2_fs_full_size_info *info = NULL;
2146
2147         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2148                                 sizeof(struct smb2_fs_full_size_info),
2149                                 persistent_fid, volatile_fid);
2150         if (rc)
2151                 return rc;
2152
2153         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2154         if (rc) {
2155                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2156                 goto qinf_exit;
2157         }
2158         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2159
2160         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2161                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2162         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2163                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2164                           sizeof(struct smb2_fs_full_size_info));
2165         if (!rc)
2166                 copy_fs_info_to_kstatfs(info, fsdata);
2167
2168 qinf_exit:
2169         free_rsp_buf(resp_buftype, iov.iov_base);
2170         return rc;
2171 }
2172
2173 int
2174 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2175            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2176            const __u32 num_lock, struct smb2_lock_element *buf)
2177 {
2178         int rc = 0;
2179         struct smb2_lock_req *req = NULL;
2180         struct kvec iov[2];
2181         int resp_buf_type;
2182         unsigned int count;
2183
2184         cFYI(1, "smb2_lockv num lock %d", num_lock);
2185
2186         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2187         if (rc)
2188                 return rc;
2189
2190         req->hdr.ProcessId = cpu_to_le32(pid);
2191         req->LockCount = cpu_to_le16(num_lock);
2192
2193         req->PersistentFileId = persist_fid;
2194         req->VolatileFileId = volatile_fid;
2195
2196         count = num_lock * sizeof(struct smb2_lock_element);
2197         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2198
2199         iov[0].iov_base = (char *)req;
2200         /* 4 for rfc1002 length field and count for all locks */
2201         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2202         iov[1].iov_base = (char *)buf;
2203         iov[1].iov_len = count;
2204
2205         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2206         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2207         if (rc) {
2208                 cFYI(1, "Send error in smb2_lockv = %d", rc);
2209                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2210         }
2211
2212         return rc;
2213 }
2214
2215 int
2216 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2217           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2218           const __u64 length, const __u64 offset, const __u32 lock_flags,
2219           const bool wait)
2220 {
2221         struct smb2_lock_element lock;
2222
2223         lock.Offset = cpu_to_le64(offset);
2224         lock.Length = cpu_to_le64(length);
2225         lock.Flags = cpu_to_le32(lock_flags);
2226         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2227                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2228
2229         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2230 }