fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   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 #include "cifs_spnego.h"
  50
  51 /*
  52  *  The following table defines the expected "StructureSize" of SMB2 requests
  53  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  54  *
  55  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  56  *  indexed by command in host byte order.
  57  */
  58 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  59         /* SMB2_NEGOTIATE */ 36,
  60         /* SMB2_SESSION_SETUP */ 25,
  61         /* SMB2_LOGOFF */ 4,
  62         /* SMB2_TREE_CONNECT */ 9,
  63         /* SMB2_TREE_DISCONNECT */ 4,
  64         /* SMB2_CREATE */ 57,
  65         /* SMB2_CLOSE */ 24,
  66         /* SMB2_FLUSH */ 24,
  67         /* SMB2_READ */ 49,
  68         /* SMB2_WRITE */ 49,
  69         /* SMB2_LOCK */ 48,
  70         /* SMB2_IOCTL */ 57,
  71         /* SMB2_CANCEL */ 4,
  72         /* SMB2_ECHO */ 4,
  73         /* SMB2_QUERY_DIRECTORY */ 33,
  74         /* SMB2_CHANGE_NOTIFY */ 32,
  75         /* SMB2_QUERY_INFO */ 41,
  76         /* SMB2_SET_INFO */ 33,
  77         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  78 };
  79
  80
  81 static void
  82 smb2_hdr_assemble(struct smb2_hdr *hdr, __le16 smb2_cmd /* command */ ,
  83                   const struct cifs_tcon *tcon)
  84 {
  85         struct smb2_pdu *pdu = (struct smb2_pdu *)hdr;
  86         char *temp = (char *)hdr;
  87         /* lookup word count ie StructureSize from table */
  88         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_cmd)];
  89
  90         /*
  91          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
  92          * largest operations (Create)
  93          */
  94         memset(temp, 0, 256);
  95
  96         /* Note this is only network field converted to big endian */
  97         hdr->smb2_buf_length = cpu_to_be32(parmsize + sizeof(struct smb2_hdr)
  98                         - 4 /*  RFC 1001 length field itself not counted */);
  99
 100         hdr->ProtocolId[0] = 0xFE;
 101         hdr->ProtocolId[1] = 'S';
 102         hdr->ProtocolId[2] = 'M';
 103         hdr->ProtocolId[3] = 'B';
 104         hdr->StructureSize = cpu_to_le16(64);
 105         hdr->Command = smb2_cmd;
 106         hdr->CreditRequest = cpu_to_le16(2); /* BB make this dynamic */
 107         hdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 108
 109         if (!tcon)
 110                 goto out;
 111
 112         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 113         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 114         if ((tcon->ses) && (tcon->ses->server) &&
 115             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 116                 hdr->CreditCharge = cpu_to_le16(1);
 117         /* else CreditCharge MBZ */
 118
 119         hdr->TreeId = tcon->tid;
 120         /* Uid is not converted */
 121         if (tcon->ses)
 122                 hdr->SessionId = tcon->ses->Suid;
 123
 124         /*
 125          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 126          * to pass the path on the Open SMB prefixed by \\server\share.
 127          * Not sure when we would need to do the augmented path (if ever) and
 128          * setting this flag breaks the SMB2 open operation since it is
 129          * illegal to send an empty path name (without \\server\share prefix)
 130          * when the DFS flag is set in the SMB open header. We could
 131          * consider setting the flag on all operations other than open
 132          * but it is safer to net set it for now.
 133          */
 134 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 135                 hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 136
 137         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign)
 138                 hdr->Flags |= SMB2_FLAGS_SIGNED;
 139 out:
 140         pdu->StructureSize2 = cpu_to_le16(parmsize);
 141         return;
 142 }
 143
 144 static int
 145 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 146 {
 147         int rc = 0;
 148         struct nls_table *nls_codepage;
 149         struct cifs_ses *ses;
 150         struct TCP_Server_Info *server;
 151
 152         /*
 153          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 154          * check for tcp and smb session status done differently
 155          * for those three - in the calling routine.
 156          */
 157         if (tcon == NULL)
 158                 return rc;
 159
 160         if (smb2_command == SMB2_TREE_CONNECT)
 161                 return rc;
 162
 163         if (tcon->tidStatus == CifsExiting) {
 164                 /*
 165                  * only tree disconnect, open, and write,
 166                  * (and ulogoff which does not have tcon)
 167                  * are allowed as we start force umount.
 168                  */
 169                 if ((smb2_command != SMB2_WRITE) &&
 170                    (smb2_command != SMB2_CREATE) &&
 171                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 172                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 173                                  smb2_command);
 174                         return -ENODEV;
 175                 }
 176         }
 177         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 178             (!tcon->ses->server))
 179                 return -EIO;
 180
 181         ses = tcon->ses;
 182         server = ses->server;
 183
 184         /*
 185          * Give demultiplex thread up to 10 seconds to reconnect, should be
 186          * greater than cifs socket timeout which is 7 seconds
 187          */
 188         while (server->tcpStatus == CifsNeedReconnect) {
 189                 /*
 190                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 191                  * here since they are implicitly done when session drops.
 192                  */
 193                 switch (smb2_command) {
 194                 /*
 195                  * BB Should we keep oplock break and add flush to exceptions?
 196                  */
 197                 case SMB2_TREE_DISCONNECT:
 198                 case SMB2_CANCEL:
 199                 case SMB2_CLOSE:
 200                 case SMB2_OPLOCK_BREAK:
 201                         return -EAGAIN;
 202                 }
 203
 204                 wait_event_interruptible_timeout(server->response_q,
 205                         (server->tcpStatus != CifsNeedReconnect), 10 * HZ);
 206
 207                 /* are we still trying to reconnect? */
 208                 if (server->tcpStatus != CifsNeedReconnect)
 209                         break;
 210
 211                 /*
 212                  * on "soft" mounts we wait once. Hard mounts keep
 213                  * retrying until process is killed or server comes
 214                  * back on-line
 215                  */
 216                 if (!tcon->retry) {
 217                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 218                         return -EHOSTDOWN;
 219                 }
 220         }
 221
 222         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 223                 return rc;
 224
 225         nls_codepage = load_nls_default();
 226
 227         /*
 228          * need to prevent multiple threads trying to simultaneously reconnect
 229          * the same SMB session
 230          */
 231         mutex_lock(&tcon->ses->session_mutex);
 232         rc = cifs_negotiate_protocol(0, tcon->ses);
 233         if (!rc && tcon->ses->need_reconnect)
 234                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 235
 236         if (rc || !tcon->need_reconnect) {
 237                 mutex_unlock(&tcon->ses->session_mutex);
 238                 goto out;
 239         }
 240
 241         cifs_mark_open_files_invalid(tcon);
 242         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 243         mutex_unlock(&tcon->ses->session_mutex);
 244         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 245         if (rc)
 246                 goto out;
 247         atomic_inc(&tconInfoReconnectCount);
 248 out:
 249         /*
 250          * Check if handle based operation so we know whether we can continue
 251          * or not without returning to caller to reset file handle.
 252          */
 253         /*
 254          * BB Is flush done by server on drop of tcp session? Should we special
 255          * case it and skip above?
 256          */
 257         switch (smb2_command) {
 258         case SMB2_FLUSH:
 259         case SMB2_READ:
 260         case SMB2_WRITE:
 261         case SMB2_LOCK:
 262         case SMB2_IOCTL:
 263         case SMB2_QUERY_DIRECTORY:
 264         case SMB2_CHANGE_NOTIFY:
 265         case SMB2_QUERY_INFO:
 266         case SMB2_SET_INFO:
 267                 return -EAGAIN;
 268         }
 269         unload_nls(nls_codepage);
 270         return rc;
 271 }
 272
 273 /*
 274  * Allocate and return pointer to an SMB request hdr, and set basic
 275  * SMB information in the SMB header. If the return code is zero, this
 276  * function must have filled in request_buf pointer.
 277  */
 278 static int
 279 small_smb2_init(__le16 smb2_command, struct cifs_tcon *tcon,
 280                 void **request_buf)
 281 {
 282         int rc = 0;
 283
 284         rc = smb2_reconnect(smb2_command, tcon);
 285         if (rc)
 286                 return rc;
 287
 288         /* BB eventually switch this to SMB2 specific small buf size */
 289         *request_buf = cifs_small_buf_get();
 290         if (*request_buf == NULL) {
 291                 /* BB should we add a retry in here if not a writepage? */
 292                 return -ENOMEM;
 293         }
 294
 295         smb2_hdr_assemble((struct smb2_hdr *) *request_buf, smb2_command, tcon);
 296
 297         if (tcon != NULL) {
 298 #ifdef CONFIG_CIFS_STATS2
 299                 uint16_t com_code = le16_to_cpu(smb2_command);
 300                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 301 #endif
 302                 cifs_stats_inc(&tcon->num_smbs_sent);
 303         }
 304
 305         return rc;
 306 }
 307
 308 #ifdef CONFIG_CIFS_SMB311
 309 /* offset is sizeof smb2_negotiate_req - 4 but rounded up to 8 bytes */
 310 #define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) - 4 */
 311
 312
 313 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
 314 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
 315
 316 static void
 317 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 318 {
 319         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 320         pneg_ctxt->DataLength = cpu_to_le16(38);
 321         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 322         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 323         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 324         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 325 }
 326
 327 static void
 328 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 329 {
 330         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 331         pneg_ctxt->DataLength = cpu_to_le16(6);
 332         pneg_ctxt->CipherCount = cpu_to_le16(2);
 333         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 334         pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 335 }
 336
 337 static void
 338 assemble_neg_contexts(struct smb2_negotiate_req *req)
 339 {
 340
 341         /* +4 is to account for the RFC1001 len field */
 342         char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT + 4;
 343
 344         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 345         /* Add 2 to size to round to 8 byte boundary */
 346         pneg_ctxt += 2 + sizeof(struct smb2_preauth_neg_context);
 347         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 348         req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
 349         req->NegotiateContextCount = cpu_to_le16(2);
 350         inc_rfc1001_len(req, 4 + sizeof(struct smb2_preauth_neg_context) + 2
 351                         + sizeof(struct smb2_encryption_neg_context)); /* calculate hash */
 352 }
 353 #else
 354 static void assemble_neg_contexts(struct smb2_negotiate_req *req)
 355 {
 356         return;
 357 }
 358 #endif /* SMB311 */
 359
 360
 361 /*
 362  *
 363  *      SMB2 Worker functions follow:
 364  *
 365  *      The general structure of the worker functions is:
 366  *      1) Call smb2_init (assembles SMB2 header)
 367  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 368  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 369  *      4) Decode SMB2 command specific fields in the fixed length area
 370  *      5) Decode variable length data area (if any for this SMB2 command type)
 371  *      6) Call free smb buffer
 372  *      7) return
 373  *
 374  */
 375
 376 int
 377 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 378 {
 379         struct smb2_negotiate_req *req;
 380         struct smb2_negotiate_rsp *rsp;
 381         struct kvec iov[1];
 382         int rc = 0;
 383         int resp_buftype;
 384         struct TCP_Server_Info *server = ses->server;
 385         int blob_offset, blob_length;
 386         char *security_blob;
 387         int flags = CIFS_NEG_OP;
 388
 389         cifs_dbg(FYI, "Negotiate protocol\n");
 390
 391         if (!server) {
 392                 WARN(1, "%s: server is NULL!\n", __func__);
 393                 return -EIO;
 394         }
 395
 396         rc = small_smb2_init(SMB2_NEGOTIATE, NULL, (void **) &req);
 397         if (rc)
 398                 return rc;
 399
 400         req->hdr.SessionId = 0;
 401
 402         req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 403
 404         req->DialectCount = cpu_to_le16(1); /* One vers= at a time for now */
 405         inc_rfc1001_len(req, 2);
 406
 407         /* only one of SMB2 signing flags may be set in SMB2 request */
 408         if (ses->sign)
 409                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 410         else if (global_secflags & CIFSSEC_MAY_SIGN)
 411                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 412         else
 413                 req->SecurityMode = 0;
 414
 415         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 416
 417         /* ClientGUID must be zero for SMB2.02 dialect */
 418         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 419                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 420         else {
 421                 memcpy(req->ClientGUID, server->client_guid,
 422                         SMB2_CLIENT_GUID_SIZE);
 423                 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
 424                         assemble_neg_contexts(req);
 425         }
 426         iov[0].iov_base = (char *)req;
 427         /* 4 for rfc1002 length field */
 428         iov[0].iov_len = get_rfc1002_length(req) + 4;
 429
 430         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, flags);
 431
 432         rsp = (struct smb2_negotiate_rsp *)iov[0].iov_base;
 433         /*
 434          * No tcon so can't do
 435          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 436          */
 437         if (rc != 0)
 438                 goto neg_exit;
 439
 440         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 441
 442         /* BB we may eventually want to match the negotiated vs. requested
 443            dialect, even though we are only requesting one at a time */
 444         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 445                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 446         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 447                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 448         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 449                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 450         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 451                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 452 #ifdef CONFIG_CIFS_SMB311
 453         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 454                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 455 #endif /* SMB311 */
 456         else {
 457                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 458                          le16_to_cpu(rsp->DialectRevision));
 459                 rc = -EIO;
 460                 goto neg_exit;
 461         }
 462         server->dialect = le16_to_cpu(rsp->DialectRevision);
 463
 464         /* SMB2 only has an extended negflavor */
 465         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 466         /* set it to the maximum buffer size value we can send with 1 credit */
 467         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 468                                SMB2_MAX_BUFFER_SIZE);
 469         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 470         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 471         /* BB Do we need to validate the SecurityMode? */
 472         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 473         server->capabilities = le32_to_cpu(rsp->Capabilities);
 474         /* Internal types */
 475         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 476
 477         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 478                                                &rsp->hdr);
 479         /*
 480          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 481          * for us will be
 482          *      ses->sectype = RawNTLMSSP;
 483          * but for time being this is our only auth choice so doesn't matter.
 484          * We just found a server which sets blob length to zero expecting raw.
 485          */
 486         if (blob_length == 0)
 487                 cifs_dbg(FYI, "missing security blob on negprot\n");
 488
 489         rc = cifs_enable_signing(server, ses->sign);
 490         if (rc)
 491                 goto neg_exit;
 492         if (blob_length) {
 493                 rc = decode_negTokenInit(security_blob, blob_length, server);
 494                 if (rc == 1)
 495                         rc = 0;
 496                 else if (rc == 0)
 497                         rc = -EIO;
 498         }
 499 neg_exit:
 500         free_rsp_buf(resp_buftype, rsp);
 501         return rc;
 502 }
 503
 504 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 505 {
 506         int rc = 0;
 507         struct validate_negotiate_info_req vneg_inbuf;
 508         struct validate_negotiate_info_rsp *pneg_rsp;
 509         u32 rsplen;
 510
 511         cifs_dbg(FYI, "validate negotiate\n");
 512
 513         /*
 514          * validation ioctl must be signed, so no point sending this if we
 515          * can not sign it.  We could eventually change this to selectively
 516          * sign just this, the first and only signed request on a connection.
 517          * This is good enough for now since a user who wants better security
 518          * would also enable signing on the mount. Having validation of
 519          * negotiate info for signed connections helps reduce attack vectors
 520          */
 521         if (tcon->ses->server->sign == false)
 522                 return 0; /* validation requires signing */
 523
 524         vneg_inbuf.Capabilities =
 525                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 526         memcpy(vneg_inbuf.Guid, tcon->ses->server->client_guid,
 527                                         SMB2_CLIENT_GUID_SIZE);
 528
 529         if (tcon->ses->sign)
 530                 vneg_inbuf.SecurityMode =
 531                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 532         else if (global_secflags & CIFSSEC_MAY_SIGN)
 533                 vneg_inbuf.SecurityMode =
 534                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 535         else
 536                 vneg_inbuf.SecurityMode = 0;
 537
 538         vneg_inbuf.DialectCount = cpu_to_le16(1);
 539         vneg_inbuf.Dialects[0] =
 540                 cpu_to_le16(tcon->ses->server->vals->protocol_id);
 541
 542         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 543                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 544                 (char *)&vneg_inbuf, sizeof(struct validate_negotiate_info_req),
 545                 (char **)&pneg_rsp, &rsplen);
 546
 547         if (rc != 0) {
 548                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 549                 return -EIO;
 550         }
 551
 552         if (rsplen != sizeof(struct validate_negotiate_info_rsp)) {
 553                 cifs_dbg(VFS, "invalid size of protocol negotiate response\n");
 554                 return -EIO;
 555         }
 556
 557         /* check validate negotiate info response matches what we got earlier */
 558         if (pneg_rsp->Dialect !=
 559                         cpu_to_le16(tcon->ses->server->vals->protocol_id))
 560                 goto vneg_out;
 561
 562         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 563                 goto vneg_out;
 564
 565         /* do not validate server guid because not saved at negprot time yet */
 566
 567         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 568               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 569                 goto vneg_out;
 570
 571         /* validate negotiate successful */
 572         cifs_dbg(FYI, "validate negotiate info successful\n");
 573         return 0;
 574
 575 vneg_out:
 576         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 577         return -EIO;
 578 }
 579
 580 int
 581 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
 582                 const struct nls_table *nls_cp)
 583 {
 584         struct smb2_sess_setup_req *req;
 585         struct smb2_sess_setup_rsp *rsp = NULL;
 586         struct kvec iov[2];
 587         int rc = 0;
 588         int resp_buftype = CIFS_NO_BUFFER;
 589         __le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
 590         struct TCP_Server_Info *server = ses->server;
 591         u16 blob_length = 0;
 592         struct key *spnego_key = NULL;
 593         char *security_blob = NULL;
 594         char *ntlmssp_blob = NULL;
 595         bool use_spnego = false; /* else use raw ntlmssp */
 596
 597         cifs_dbg(FYI, "Session Setup\n");
 598
 599         if (!server) {
 600                 WARN(1, "%s: server is NULL!\n", __func__);
 601                 return -EIO;
 602         }
 603
 604         /*
 605          * If we are here due to reconnect, free per-smb session key
 606          * in case signing was required.
 607          */
 608         kfree(ses->auth_key.response);
 609         ses->auth_key.response = NULL;
 610
 611         /*
 612          * If memory allocation is successful, caller of this function
 613          * frees it.
 614          */
 615         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
 616         if (!ses->ntlmssp)
 617                 return -ENOMEM;
 618         ses->ntlmssp->sesskey_per_smbsess = true;
 619
 620         /* FIXME: allow for other auth types besides NTLMSSP (e.g. krb5) */
 621         if (ses->sectype != Kerberos && ses->sectype != RawNTLMSSP)
 622                 ses->sectype = RawNTLMSSP;
 623
 624 ssetup_ntlmssp_authenticate:
 625         if (phase == NtLmChallenge)
 626                 phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
 627
 628         rc = small_smb2_init(SMB2_SESSION_SETUP, NULL, (void **) &req);
 629         if (rc)
 630                 return rc;
 631
 632         req->hdr.SessionId = 0; /* First session, not a reauthenticate */
 633         req->Flags = 0; /* MBZ */
 634         /* to enable echos and oplocks */
 635         req->hdr.CreditRequest = cpu_to_le16(3);
 636
 637         /* only one of SMB2 signing flags may be set in SMB2 request */
 638         if (server->sign)
 639                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
 640         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
 641                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
 642         else
 643                 req->SecurityMode = 0;
 644
 645         req->Capabilities = 0;
 646         req->Channel = 0; /* MBZ */
 647
 648         iov[0].iov_base = (char *)req;
 649         /* 4 for rfc1002 length field and 1 for pad */
 650         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 651
 652         if (ses->sectype == Kerberos) {
 653 #ifdef CONFIG_CIFS_UPCALL
 654                 struct cifs_spnego_msg *msg;
 655
 656                 spnego_key = cifs_get_spnego_key(ses);
 657                 if (IS_ERR(spnego_key)) {
 658                         rc = PTR_ERR(spnego_key);
 659                         spnego_key = NULL;
 660                         goto ssetup_exit;
 661                 }
 662
 663                 msg = spnego_key->payload.data;
 664                 /*
 665                  * check version field to make sure that cifs.upcall is
 666                  * sending us a response in an expected form
 667                  */
 668                 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
 669                         cifs_dbg(VFS,
 670                                   "bad cifs.upcall version. Expected %d got %d",
 671                                   CIFS_SPNEGO_UPCALL_VERSION, msg->version);
 672                         rc = -EKEYREJECTED;
 673                         goto ssetup_exit;
 674                 }
 675                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
 676                                                  GFP_KERNEL);
 677                 if (!ses->auth_key.response) {
 678                         cifs_dbg(VFS,
 679                                 "Kerberos can't allocate (%u bytes) memory",
 680                                 msg->sesskey_len);
 681                         rc = -ENOMEM;
 682                         goto ssetup_exit;
 683                 }
 684                 ses->auth_key.len = msg->sesskey_len;
 685                 blob_length = msg->secblob_len;
 686                 iov[1].iov_base = msg->data + msg->sesskey_len;
 687                 iov[1].iov_len = blob_length;
 688 #else
 689                 rc = -EOPNOTSUPP;
 690                 goto ssetup_exit;
 691 #endif /* CONFIG_CIFS_UPCALL */
 692         } else if (phase == NtLmNegotiate) { /* if not krb5 must be ntlmssp */
 693                 ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
 694                                        GFP_KERNEL);
 695                 if (ntlmssp_blob == NULL) {
 696                         rc = -ENOMEM;
 697                         goto ssetup_exit;
 698                 }
 699                 build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
 700                 if (use_spnego) {
 701                         /* blob_length = build_spnego_ntlmssp_blob(
 702                                         &security_blob,
 703                                         sizeof(struct _NEGOTIATE_MESSAGE),
 704                                         ntlmssp_blob); */
 705                         /* BB eventually need to add this */
 706                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 707                         rc = -EOPNOTSUPP;
 708                         kfree(ntlmssp_blob);
 709                         goto ssetup_exit;
 710                 } else {
 711                         blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
 712                         /* with raw NTLMSSP we don't encapsulate in SPNEGO */
 713                         security_blob = ntlmssp_blob;
 714                 }
 715                 iov[1].iov_base = security_blob;
 716                 iov[1].iov_len = blob_length;
 717         } else if (phase == NtLmAuthenticate) {
 718                 req->hdr.SessionId = ses->Suid;
 719                 ntlmssp_blob = kzalloc(sizeof(struct _NEGOTIATE_MESSAGE) + 500,
 720                                        GFP_KERNEL);
 721                 if (ntlmssp_blob == NULL) {
 722                         rc = -ENOMEM;
 723                         goto ssetup_exit;
 724                 }
 725                 rc = build_ntlmssp_auth_blob(ntlmssp_blob, &blob_length, ses,
 726                                              nls_cp);
 727                 if (rc) {
 728                         cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n",
 729                                  rc);
 730                         goto ssetup_exit; /* BB double check error handling */
 731                 }
 732                 if (use_spnego) {
 733                         /* blob_length = build_spnego_ntlmssp_blob(
 734                                                         &security_blob,
 735                                                         blob_length,
 736                                                         ntlmssp_blob); */
 737                         cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
 738                         rc = -EOPNOTSUPP;
 739                         kfree(ntlmssp_blob);
 740                         goto ssetup_exit;
 741                 } else {
 742                         security_blob = ntlmssp_blob;
 743                 }
 744                 iov[1].iov_base = security_blob;
 745                 iov[1].iov_len = blob_length;
 746         } else {
 747                 cifs_dbg(VFS, "illegal ntlmssp phase\n");
 748                 rc = -EIO;
 749                 goto ssetup_exit;
 750         }
 751
 752         /* Testing shows that buffer offset must be at location of Buffer[0] */
 753         req->SecurityBufferOffset =
 754                                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) -
 755                                             1 /* pad */ - 4 /* rfc1001 len */);
 756         req->SecurityBufferLength = cpu_to_le16(blob_length);
 757
 758         inc_rfc1001_len(req, blob_length - 1 /* pad */);
 759
 760         /* BB add code to build os and lm fields */
 761
 762         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype,
 763                           CIFS_LOG_ERROR | CIFS_NEG_OP);
 764
 765         kfree(security_blob);
 766         rsp = (struct smb2_sess_setup_rsp *)iov[0].iov_base;
 767         ses->Suid = rsp->hdr.SessionId;
 768         if (resp_buftype != CIFS_NO_BUFFER &&
 769             rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED) {
 770                 if (phase != NtLmNegotiate) {
 771                         cifs_dbg(VFS, "Unexpected more processing error\n");
 772                         goto ssetup_exit;
 773                 }
 774                 if (offsetof(struct smb2_sess_setup_rsp, Buffer) - 4 !=
 775                                 le16_to_cpu(rsp->SecurityBufferOffset)) {
 776                         cifs_dbg(VFS, "Invalid security buffer offset %d\n",
 777                                  le16_to_cpu(rsp->SecurityBufferOffset));
 778                         rc = -EIO;
 779                         goto ssetup_exit;
 780                 }
 781
 782                 /* NTLMSSP Negotiate sent now processing challenge (response) */
 783                 phase = NtLmChallenge; /* process ntlmssp challenge */
 784                 rc = 0; /* MORE_PROCESSING is not an error here but expected */
 785                 rc = decode_ntlmssp_challenge(rsp->Buffer,
 786                                 le16_to_cpu(rsp->SecurityBufferLength), ses);
 787         }
 788
 789         /*
 790          * BB eventually add code for SPNEGO decoding of NtlmChallenge blob,
 791          * but at least the raw NTLMSSP case works.
 792          */
 793         /*
 794          * No tcon so can't do
 795          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 796          */
 797         if (rc != 0)
 798                 goto ssetup_exit;
 799
 800         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
 801         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
 802                 cifs_dbg(VFS, "SMB3 encryption not supported yet\n");
 803 ssetup_exit:
 804         free_rsp_buf(resp_buftype, rsp);
 805
 806         /* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
 807         if ((phase == NtLmChallenge) && (rc == 0))
 808                 goto ssetup_ntlmssp_authenticate;
 809
 810         if (!rc) {
 811                 mutex_lock(&server->srv_mutex);
 812                 if (server->sign && server->ops->generate_signingkey) {
 813                         rc = server->ops->generate_signingkey(ses);
 814                         kfree(ses->auth_key.response);
 815                         ses->auth_key.response = NULL;
 816                         if (rc) {
 817                                 cifs_dbg(FYI,
 818                                         "SMB3 session key generation failed\n");
 819                                 mutex_unlock(&server->srv_mutex);
 820                                 goto keygen_exit;
 821                         }
 822                 }
 823                 if (!server->session_estab) {
 824                         server->sequence_number = 0x2;
 825                         server->session_estab = true;
 826                 }
 827                 mutex_unlock(&server->srv_mutex);
 828
 829                 cifs_dbg(FYI, "SMB2/3 session established successfully\n");
 830                 spin_lock(&GlobalMid_Lock);
 831                 ses->status = CifsGood;
 832                 ses->need_reconnect = false;
 833                 spin_unlock(&GlobalMid_Lock);
 834         }
 835
 836 keygen_exit:
 837         if (!server->sign) {
 838                 kfree(ses->auth_key.response);
 839                 ses->auth_key.response = NULL;
 840         }
 841         if (spnego_key) {
 842                 key_invalidate(spnego_key);
 843                 key_put(spnego_key);
 844         }
 845         kfree(ses->ntlmssp);
 846
 847         return rc;
 848 }
 849
 850 int
 851 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
 852 {
 853         struct smb2_logoff_req *req; /* response is also trivial struct */
 854         int rc = 0;
 855         struct TCP_Server_Info *server;
 856
 857         cifs_dbg(FYI, "disconnect session %p\n", ses);
 858
 859         if (ses && (ses->server))
 860                 server = ses->server;
 861         else
 862                 return -EIO;
 863
 864         /* no need to send SMB logoff if uid already closed due to reconnect */
 865         if (ses->need_reconnect)
 866                 goto smb2_session_already_dead;
 867
 868         rc = small_smb2_init(SMB2_LOGOFF, NULL, (void **) &req);
 869         if (rc)
 870                 return rc;
 871
 872          /* since no tcon, smb2_init can not do this, so do here */
 873         req->hdr.SessionId = ses->Suid;
 874         if (server->sign)
 875                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
 876
 877         rc = SendReceiveNoRsp(xid, ses, (char *) &req->hdr, 0);
 878         /*
 879          * No tcon so can't do
 880          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 881          */
 882
 883 smb2_session_already_dead:
 884         return rc;
 885 }
 886
 887 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
 888 {
 889         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
 890 }
 891
 892 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
 893
 894 /* These are similar values to what Windows uses */
 895 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
 896 {
 897         tcon->max_chunks = 256;
 898         tcon->max_bytes_chunk = 1048576;
 899         tcon->max_bytes_copy = 16777216;
 900 }
 901
 902 int
 903 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
 904           struct cifs_tcon *tcon, const struct nls_table *cp)
 905 {
 906         struct smb2_tree_connect_req *req;
 907         struct smb2_tree_connect_rsp *rsp = NULL;
 908         struct kvec iov[2];
 909         int rc = 0;
 910         int resp_buftype;
 911         int unc_path_len;
 912         struct TCP_Server_Info *server;
 913         __le16 *unc_path = NULL;
 914
 915         cifs_dbg(FYI, "TCON\n");
 916
 917         if ((ses->server) && tree)
 918                 server = ses->server;
 919         else
 920                 return -EIO;
 921
 922         if (tcon && tcon->bad_network_name)
 923                 return -ENOENT;
 924
 925         if ((tcon && tcon->seal) &&
 926             ((ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION) == 0)) {
 927                 cifs_dbg(VFS, "encryption requested but no server support");
 928                 return -EOPNOTSUPP;
 929         }
 930
 931         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
 932         if (unc_path == NULL)
 933                 return -ENOMEM;
 934
 935         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
 936         unc_path_len *= 2;
 937         if (unc_path_len < 2) {
 938                 kfree(unc_path);
 939                 return -EINVAL;
 940         }
 941
 942         rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
 943         if (rc) {
 944                 kfree(unc_path);
 945                 return rc;
 946         }
 947
 948         if (tcon == NULL) {
 949                 /* since no tcon, smb2_init can not do this, so do here */
 950                 req->hdr.SessionId = ses->Suid;
 951                 /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
 952                         req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
 953         }
 954
 955         iov[0].iov_base = (char *)req;
 956         /* 4 for rfc1002 length field and 1 for pad */
 957         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
 958
 959         /* Testing shows that buffer offset must be at location of Buffer[0] */
 960         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
 961                         - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
 962         req->PathLength = cpu_to_le16(unc_path_len - 2);
 963         iov[1].iov_base = unc_path;
 964         iov[1].iov_len = unc_path_len;
 965
 966         inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
 967
 968         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
 969         rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
 970
 971         if (rc != 0) {
 972                 if (tcon) {
 973                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
 974                         tcon->need_reconnect = true;
 975                 }
 976                 goto tcon_error_exit;
 977         }
 978
 979         if (tcon == NULL) {
 980                 ses->ipc_tid = rsp->hdr.TreeId;
 981                 goto tcon_exit;
 982         }
 983
 984         if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
 985                 cifs_dbg(FYI, "connection to disk share\n");
 986         else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
 987                 tcon->ipc = true;
 988                 cifs_dbg(FYI, "connection to pipe share\n");
 989         } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
 990                 tcon->print = true;
 991                 cifs_dbg(FYI, "connection to printer\n");
 992         } else {
 993                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
 994                 rc = -EOPNOTSUPP;
 995                 goto tcon_error_exit;
 996         }
 997
 998         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
 999         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1000         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1001         tcon->tidStatus = CifsGood;
1002         tcon->need_reconnect = false;
1003         tcon->tid = rsp->hdr.TreeId;
1004         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1005
1006         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1007             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1008                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1009         init_copy_chunk_defaults(tcon);
1010         if (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA)
1011                 cifs_dbg(VFS, "Encrypted shares not supported");
1012         if (tcon->ses->server->ops->validate_negotiate)
1013                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1014 tcon_exit:
1015         free_rsp_buf(resp_buftype, rsp);
1016         kfree(unc_path);
1017         return rc;
1018
1019 tcon_error_exit:
1020         if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
1021                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1022                 if (tcon)
1023                         tcon->bad_network_name = true;
1024         }
1025         goto tcon_exit;
1026 }
1027
1028 int
1029 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1030 {
1031         struct smb2_tree_disconnect_req *req; /* response is trivial */
1032         int rc = 0;
1033         struct TCP_Server_Info *server;
1034         struct cifs_ses *ses = tcon->ses;
1035
1036         cifs_dbg(FYI, "Tree Disconnect\n");
1037
1038         if (ses && (ses->server))
1039                 server = ses->server;
1040         else
1041                 return -EIO;
1042
1043         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1044                 return 0;
1045
1046         rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
1047         if (rc)
1048                 return rc;
1049
1050         rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
1051         if (rc)
1052                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1053
1054         return rc;
1055 }
1056
1057
1058 static struct create_durable *
1059 create_durable_buf(void)
1060 {
1061         struct create_durable *buf;
1062
1063         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1064         if (!buf)
1065                 return NULL;
1066
1067         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1068                                         (struct create_durable, Data));
1069         buf->ccontext.DataLength = cpu_to_le32(16);
1070         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1071                                 (struct create_durable, Name));
1072         buf->ccontext.NameLength = cpu_to_le16(4);
1073         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1074         buf->Name[0] = 'D';
1075         buf->Name[1] = 'H';
1076         buf->Name[2] = 'n';
1077         buf->Name[3] = 'Q';
1078         return buf;
1079 }
1080
1081 static struct create_durable *
1082 create_reconnect_durable_buf(struct cifs_fid *fid)
1083 {
1084         struct create_durable *buf;
1085
1086         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1087         if (!buf)
1088                 return NULL;
1089
1090         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1091                                         (struct create_durable, Data));
1092         buf->ccontext.DataLength = cpu_to_le32(16);
1093         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1094                                 (struct create_durable, Name));
1095         buf->ccontext.NameLength = cpu_to_le16(4);
1096         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1097         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1098         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1099         buf->Name[0] = 'D';
1100         buf->Name[1] = 'H';
1101         buf->Name[2] = 'n';
1102         buf->Name[3] = 'C';
1103         return buf;
1104 }
1105
1106 static __u8
1107 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1108                   unsigned int *epoch)
1109 {
1110         char *data_offset;
1111         struct create_context *cc;
1112         unsigned int next = 0;
1113         char *name;
1114
1115         data_offset = (char *)rsp + 4 + le32_to_cpu(rsp->CreateContextsOffset);
1116         cc = (struct create_context *)data_offset;
1117         do {
1118                 cc = (struct create_context *)((char *)cc + next);
1119                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1120                 if (le16_to_cpu(cc->NameLength) != 4 ||
1121                     strncmp(name, "RqLs", 4)) {
1122                         next = le32_to_cpu(cc->Next);
1123                         continue;
1124                 }
1125                 return server->ops->parse_lease_buf(cc, epoch);
1126         } while (next != 0);
1127
1128         return 0;
1129 }
1130
1131 static int
1132 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1133                   unsigned int *num_iovec, __u8 *oplock)
1134 {
1135         struct smb2_create_req *req = iov[0].iov_base;
1136         unsigned int num = *num_iovec;
1137
1138         iov[num].iov_base = server->ops->create_lease_buf(oplock+1, *oplock);
1139         if (iov[num].iov_base == NULL)
1140                 return -ENOMEM;
1141         iov[num].iov_len = server->vals->create_lease_size;
1142         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1143         if (!req->CreateContextsOffset)
1144                 req->CreateContextsOffset = cpu_to_le32(
1145                                 sizeof(struct smb2_create_req) - 4 +
1146                                 iov[num - 1].iov_len);
1147         le32_add_cpu(&req->CreateContextsLength,
1148                      server->vals->create_lease_size);
1149         inc_rfc1001_len(&req->hdr, server->vals->create_lease_size);
1150         *num_iovec = num + 1;
1151         return 0;
1152 }
1153
1154 static int
1155 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1156                     struct cifs_open_parms *oparms)
1157 {
1158         struct smb2_create_req *req = iov[0].iov_base;
1159         unsigned int num = *num_iovec;
1160
1161         if (oparms->reconnect) {
1162                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1163                 /* indicate that we don't need to relock the file */
1164                 oparms->reconnect = false;
1165         } else
1166                 iov[num].iov_base = create_durable_buf();
1167         if (iov[num].iov_base == NULL)
1168                 return -ENOMEM;
1169         iov[num].iov_len = sizeof(struct create_durable);
1170         if (!req->CreateContextsOffset)
1171                 req->CreateContextsOffset =
1172                         cpu_to_le32(sizeof(struct smb2_create_req) - 4 +
1173                                                                 iov[1].iov_len);
1174         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1175         inc_rfc1001_len(&req->hdr, sizeof(struct create_durable));
1176         *num_iovec = num + 1;
1177         return 0;
1178 }
1179
1180 int
1181 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
1182           __u8 *oplock, struct smb2_file_all_info *buf,
1183           struct smb2_err_rsp **err_buf)
1184 {
1185         struct smb2_create_req *req;
1186         struct smb2_create_rsp *rsp;
1187         struct TCP_Server_Info *server;
1188         struct cifs_tcon *tcon = oparms->tcon;
1189         struct cifs_ses *ses = tcon->ses;
1190         struct kvec iov[4];
1191         int resp_buftype;
1192         int uni_path_len;
1193         __le16 *copy_path = NULL;
1194         int copy_size;
1195         int rc = 0;
1196         unsigned int num_iovecs = 2;
1197         __u32 file_attributes = 0;
1198         char *dhc_buf = NULL, *lc_buf = NULL;
1199
1200         cifs_dbg(FYI, "create/open\n");
1201
1202         if (ses && (ses->server))
1203                 server = ses->server;
1204         else
1205                 return -EIO;
1206
1207         rc = small_smb2_init(SMB2_CREATE, tcon, (void **) &req);
1208         if (rc)
1209                 return rc;
1210
1211         if (oparms->create_options & CREATE_OPTION_READONLY)
1212                 file_attributes |= ATTR_READONLY;
1213         if (oparms->create_options & CREATE_OPTION_SPECIAL)
1214                 file_attributes |= ATTR_SYSTEM;
1215
1216         req->ImpersonationLevel = IL_IMPERSONATION;
1217         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
1218         /* File attributes ignored on open (used in create though) */
1219         req->FileAttributes = cpu_to_le32(file_attributes);
1220         req->ShareAccess = FILE_SHARE_ALL_LE;
1221         req->CreateDisposition = cpu_to_le32(oparms->disposition);
1222         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
1223         uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
1224         /* do not count rfc1001 len field */
1225         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req) - 4);
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         /* MUST set path len (NameLength) to 0 opening root of share */
1232         req->NameLength = cpu_to_le16(uni_path_len - 2);
1233         /* -1 since last byte is buf[0] which is sent below (path) */
1234         iov[0].iov_len--;
1235         if (uni_path_len % 8 != 0) {
1236                 copy_size = uni_path_len / 8 * 8;
1237                 if (copy_size < uni_path_len)
1238                         copy_size += 8;
1239
1240                 copy_path = kzalloc(copy_size, GFP_KERNEL);
1241                 if (!copy_path)
1242                         return -ENOMEM;
1243                 memcpy((char *)copy_path, (const char *)path,
1244                         uni_path_len);
1245                 uni_path_len = copy_size;
1246                 path = copy_path;
1247         }
1248
1249         iov[1].iov_len = uni_path_len;
1250         iov[1].iov_base = path;
1251         /* -1 since last byte is buf[0] which was counted in smb2_buf_len */
1252         inc_rfc1001_len(req, uni_path_len - 1);
1253
1254         if (!server->oplocks)
1255                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
1256
1257         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
1258             *oplock == SMB2_OPLOCK_LEVEL_NONE)
1259                 req->RequestedOplockLevel = *oplock;
1260         else {
1261                 rc = add_lease_context(server, iov, &num_iovecs, oplock);
1262                 if (rc) {
1263                         cifs_small_buf_release(req);
1264                         kfree(copy_path);
1265                         return rc;
1266                 }
1267                 lc_buf = iov[num_iovecs-1].iov_base;
1268         }
1269
1270         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
1271                 /* need to set Next field of lease context if we request it */
1272                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
1273                         struct create_context *ccontext =
1274                             (struct create_context *)iov[num_iovecs-1].iov_base;
1275                         ccontext->Next =
1276                                 cpu_to_le32(server->vals->create_lease_size);
1277                 }
1278                 rc = add_durable_context(iov, &num_iovecs, oparms);
1279                 if (rc) {
1280                         cifs_small_buf_release(req);
1281                         kfree(copy_path);
1282                         kfree(lc_buf);
1283                         return rc;
1284                 }
1285                 dhc_buf = iov[num_iovecs-1].iov_base;
1286         }
1287
1288         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1289         rsp = (struct smb2_create_rsp *)iov[0].iov_base;
1290
1291         if (rc != 0) {
1292                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
1293                 if (err_buf)
1294                         *err_buf = kmemdup(rsp, get_rfc1002_length(rsp) + 4,
1295                                            GFP_KERNEL);
1296                 goto creat_exit;
1297         }
1298
1299         oparms->fid->persistent_fid = rsp->PersistentFileId;
1300         oparms->fid->volatile_fid = rsp->VolatileFileId;
1301
1302         if (buf) {
1303                 memcpy(buf, &rsp->CreationTime, 32);
1304                 buf->AllocationSize = rsp->AllocationSize;
1305                 buf->EndOfFile = rsp->EndofFile;
1306                 buf->Attributes = rsp->FileAttributes;
1307                 buf->NumberOfLinks = cpu_to_le32(1);
1308                 buf->DeletePending = 0;
1309         }
1310
1311         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
1312                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
1313         else
1314                 *oplock = rsp->OplockLevel;
1315 creat_exit:
1316         kfree(copy_path);
1317         kfree(lc_buf);
1318         kfree(dhc_buf);
1319         free_rsp_buf(resp_buftype, rsp);
1320         return rc;
1321 }
1322
1323 /*
1324  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
1325  */
1326 int
1327 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1328            u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
1329            u32 indatalen, char **out_data, u32 *plen /* returned data len */)
1330 {
1331         struct smb2_ioctl_req *req;
1332         struct smb2_ioctl_rsp *rsp;
1333         struct TCP_Server_Info *server;
1334         struct cifs_ses *ses;
1335         struct kvec iov[2];
1336         int resp_buftype;
1337         int num_iovecs;
1338         int rc = 0;
1339
1340         cifs_dbg(FYI, "SMB2 IOCTL\n");
1341
1342         if (out_data != NULL)
1343                 *out_data = NULL;
1344
1345         /* zero out returned data len, in case of error */
1346         if (plen)
1347                 *plen = 0;
1348
1349         if (tcon)
1350                 ses = tcon->ses;
1351         else
1352                 return -EIO;
1353
1354         if (ses && (ses->server))
1355                 server = ses->server;
1356         else
1357                 return -EIO;
1358
1359         rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
1360         if (rc)
1361                 return rc;
1362
1363         req->CtlCode = cpu_to_le32(opcode);
1364         req->PersistentFileId = persistent_fid;
1365         req->VolatileFileId = volatile_fid;
1366
1367         if (indatalen) {
1368                 req->InputCount = cpu_to_le32(indatalen);
1369                 /* do not set InputOffset if no input data */
1370                 req->InputOffset =
1371                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
1372                 iov[1].iov_base = in_data;
1373                 iov[1].iov_len = indatalen;
1374                 num_iovecs = 2;
1375         } else
1376                 num_iovecs = 1;
1377
1378         req->OutputOffset = 0;
1379         req->OutputCount = 0; /* MBZ */
1380
1381         /*
1382          * Could increase MaxOutputResponse, but that would require more
1383          * than one credit. Windows typically sets this smaller, but for some
1384          * ioctls it may be useful to allow server to send more. No point
1385          * limiting what the server can send as long as fits in one credit
1386          */
1387         req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
1388
1389         if (is_fsctl)
1390                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
1391         else
1392                 req->Flags = 0;
1393
1394         iov[0].iov_base = (char *)req;
1395
1396         /*
1397          * If no input data, the size of ioctl struct in
1398          * protocol spec still includes a 1 byte data buffer,
1399          * but if input data passed to ioctl, we do not
1400          * want to double count this, so we do not send
1401          * the dummy one byte of data in iovec[0] if sending
1402          * input data (in iovec[1]). We also must add 4 bytes
1403          * in first iovec to allow for rfc1002 length field.
1404          */
1405
1406         if (indatalen) {
1407                 iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
1408                 inc_rfc1001_len(req, indatalen - 1);
1409         } else
1410                 iov[0].iov_len = get_rfc1002_length(req) + 4;
1411
1412
1413         rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
1414         rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
1415
1416         if ((rc != 0) && (rc != -EINVAL)) {
1417                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1418                 goto ioctl_exit;
1419         } else if (rc == -EINVAL) {
1420                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
1421                     (opcode != FSCTL_SRV_COPYCHUNK)) {
1422                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
1423                         goto ioctl_exit;
1424                 }
1425         }
1426
1427         /* check if caller wants to look at return data or just return rc */
1428         if ((plen == NULL) || (out_data == NULL))
1429                 goto ioctl_exit;
1430
1431         *plen = le32_to_cpu(rsp->OutputCount);
1432
1433         /* We check for obvious errors in the output buffer length and offset */
1434         if (*plen == 0)
1435                 goto ioctl_exit; /* server returned no data */
1436         else if (*plen > 0xFF00) {
1437                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
1438                 *plen = 0;
1439                 rc = -EIO;
1440                 goto ioctl_exit;
1441         }
1442
1443         if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
1444                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
1445                         le32_to_cpu(rsp->OutputOffset));
1446                 *plen = 0;
1447                 rc = -EIO;
1448                 goto ioctl_exit;
1449         }
1450
1451         *out_data = kmalloc(*plen, GFP_KERNEL);
1452         if (*out_data == NULL) {
1453                 rc = -ENOMEM;
1454                 goto ioctl_exit;
1455         }
1456
1457         memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
1458                *plen);
1459 ioctl_exit:
1460         free_rsp_buf(resp_buftype, rsp);
1461         return rc;
1462 }
1463
1464 /*
1465  *   Individual callers to ioctl worker function follow
1466  */
1467
1468 int
1469 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
1470                      u64 persistent_fid, u64 volatile_fid)
1471 {
1472         int rc;
1473         struct  compress_ioctl fsctl_input;
1474         char *ret_data = NULL;
1475
1476         fsctl_input.CompressionState =
1477                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
1478
1479         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
1480                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
1481                         (char *)&fsctl_input /* data input */,
1482                         2 /* in data len */, &ret_data /* out data */, NULL);
1483
1484         cifs_dbg(FYI, "set compression rc %d\n", rc);
1485
1486         return rc;
1487 }
1488
1489 int
1490 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
1491            u64 persistent_fid, u64 volatile_fid)
1492 {
1493         struct smb2_close_req *req;
1494         struct smb2_close_rsp *rsp;
1495         struct TCP_Server_Info *server;
1496         struct cifs_ses *ses = tcon->ses;
1497         struct kvec iov[1];
1498         int resp_buftype;
1499         int rc = 0;
1500
1501         cifs_dbg(FYI, "Close\n");
1502
1503         if (ses && (ses->server))
1504                 server = ses->server;
1505         else
1506                 return -EIO;
1507
1508         rc = small_smb2_init(SMB2_CLOSE, tcon, (void **) &req);
1509         if (rc)
1510                 return rc;
1511
1512         req->PersistentFileId = persistent_fid;
1513         req->VolatileFileId = volatile_fid;
1514
1515         iov[0].iov_base = (char *)req;
1516         /* 4 for rfc1002 length field */
1517         iov[0].iov_len = get_rfc1002_length(req) + 4;
1518
1519         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1520         rsp = (struct smb2_close_rsp *)iov[0].iov_base;
1521
1522         if (rc != 0) {
1523                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
1524                 goto close_exit;
1525         }
1526
1527         /* BB FIXME - decode close response, update inode for caching */
1528
1529 close_exit:
1530         free_rsp_buf(resp_buftype, rsp);
1531         return rc;
1532 }
1533
1534 static int
1535 validate_buf(unsigned int offset, unsigned int buffer_length,
1536              struct smb2_hdr *hdr, unsigned int min_buf_size)
1537
1538 {
1539         unsigned int smb_len = be32_to_cpu(hdr->smb2_buf_length);
1540         char *end_of_smb = smb_len + 4 /* RFC1001 length field */ + (char *)hdr;
1541         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1542         char *end_of_buf = begin_of_buf + buffer_length;
1543
1544
1545         if (buffer_length < min_buf_size) {
1546                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
1547                          buffer_length, min_buf_size);
1548                 return -EINVAL;
1549         }
1550
1551         /* check if beyond RFC1001 maximum length */
1552         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
1553                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
1554                          buffer_length, smb_len);
1555                 return -EINVAL;
1556         }
1557
1558         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
1559                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
1560                 return -EINVAL;
1561         }
1562
1563         return 0;
1564 }
1565
1566 /*
1567  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
1568  * Caller must free buffer.
1569  */
1570 static int
1571 validate_and_copy_buf(unsigned int offset, unsigned int buffer_length,
1572                       struct smb2_hdr *hdr, unsigned int minbufsize,
1573                       char *data)
1574
1575 {
1576         char *begin_of_buf = 4 /* RFC1001 len field */ + offset + (char *)hdr;
1577         int rc;
1578
1579         if (!data)
1580                 return -EINVAL;
1581
1582         rc = validate_buf(offset, buffer_length, hdr, minbufsize);
1583         if (rc)
1584                 return rc;
1585
1586         memcpy(data, begin_of_buf, buffer_length);
1587
1588         return 0;
1589 }
1590
1591 static int
1592 query_info(const unsigned int xid, struct cifs_tcon *tcon,
1593            u64 persistent_fid, u64 volatile_fid, u8 info_class,
1594            size_t output_len, size_t min_len, void *data)
1595 {
1596         struct smb2_query_info_req *req;
1597         struct smb2_query_info_rsp *rsp = NULL;
1598         struct kvec iov[2];
1599         int rc = 0;
1600         int resp_buftype;
1601         struct TCP_Server_Info *server;
1602         struct cifs_ses *ses = tcon->ses;
1603
1604         cifs_dbg(FYI, "Query Info\n");
1605
1606         if (ses && (ses->server))
1607                 server = ses->server;
1608         else
1609                 return -EIO;
1610
1611         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
1612         if (rc)
1613                 return rc;
1614
1615         req->InfoType = SMB2_O_INFO_FILE;
1616         req->FileInfoClass = info_class;
1617         req->PersistentFileId = persistent_fid;
1618         req->VolatileFileId = volatile_fid;
1619         /* 4 for rfc1002 length field and 1 for Buffer */
1620         req->InputBufferOffset =
1621                 cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
1622         req->OutputBufferLength = cpu_to_le32(output_len);
1623
1624         iov[0].iov_base = (char *)req;
1625         /* 4 for rfc1002 length field */
1626         iov[0].iov_len = get_rfc1002_length(req) + 4;
1627
1628         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1629         rsp = (struct smb2_query_info_rsp *)iov[0].iov_base;
1630
1631         if (rc) {
1632                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
1633                 goto qinf_exit;
1634         }
1635
1636         rc = validate_and_copy_buf(le16_to_cpu(rsp->OutputBufferOffset),
1637                                    le32_to_cpu(rsp->OutputBufferLength),
1638                                    &rsp->hdr, min_len, data);
1639
1640 qinf_exit:
1641         free_rsp_buf(resp_buftype, rsp);
1642         return rc;
1643 }
1644
1645 int
1646 SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
1647                 u64 persistent_fid, u64 volatile_fid,
1648                 struct smb2_file_all_info *data)
1649 {
1650         return query_info(xid, tcon, persistent_fid, volatile_fid,
1651                           FILE_ALL_INFORMATION,
1652                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
1653                           sizeof(struct smb2_file_all_info), data);
1654 }
1655
1656 int
1657 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
1658                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
1659 {
1660         return query_info(xid, tcon, persistent_fid, volatile_fid,
1661                           FILE_INTERNAL_INFORMATION,
1662                           sizeof(struct smb2_file_internal_info),
1663                           sizeof(struct smb2_file_internal_info), uniqueid);
1664 }
1665
1666 /*
1667  * This is a no-op for now. We're not really interested in the reply, but
1668  * rather in the fact that the server sent one and that server->lstrp
1669  * gets updated.
1670  *
1671  * FIXME: maybe we should consider checking that the reply matches request?
1672  */
1673 static void
1674 smb2_echo_callback(struct mid_q_entry *mid)
1675 {
1676         struct TCP_Server_Info *server = mid->callback_data;
1677         struct smb2_echo_rsp *smb2 = (struct smb2_echo_rsp *)mid->resp_buf;
1678         unsigned int credits_received = 1;
1679
1680         if (mid->mid_state == MID_RESPONSE_RECEIVED)
1681                 credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
1682
1683         mutex_lock(&server->srv_mutex);
1684         DeleteMidQEntry(mid);
1685         mutex_unlock(&server->srv_mutex);
1686         add_credits(server, credits_received, CIFS_ECHO_OP);
1687 }
1688
1689 int
1690 SMB2_echo(struct TCP_Server_Info *server)
1691 {
1692         struct smb2_echo_req *req;
1693         int rc = 0;
1694         struct kvec iov;
1695         struct smb_rqst rqst = { .rq_iov = &iov,
1696                                  .rq_nvec = 1 };
1697
1698         cifs_dbg(FYI, "In echo request\n");
1699
1700         rc = small_smb2_init(SMB2_ECHO, NULL, (void **)&req);
1701         if (rc)
1702                 return rc;
1703
1704         req->hdr.CreditRequest = cpu_to_le16(1);
1705
1706         iov.iov_base = (char *)req;
1707         /* 4 for rfc1002 length field */
1708         iov.iov_len = get_rfc1002_length(req) + 4;
1709
1710         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, server,
1711                              CIFS_ECHO_OP);
1712         if (rc)
1713                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
1714
1715         cifs_small_buf_release(req);
1716         return rc;
1717 }
1718
1719 int
1720 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
1721            u64 volatile_fid)
1722 {
1723         struct smb2_flush_req *req;
1724         struct TCP_Server_Info *server;
1725         struct cifs_ses *ses = tcon->ses;
1726         struct kvec iov[1];
1727         int resp_buftype;
1728         int rc = 0;
1729
1730         cifs_dbg(FYI, "Flush\n");
1731
1732         if (ses && (ses->server))
1733                 server = ses->server;
1734         else
1735                 return -EIO;
1736
1737         rc = small_smb2_init(SMB2_FLUSH, tcon, (void **) &req);
1738         if (rc)
1739                 return rc;
1740
1741         req->PersistentFileId = persistent_fid;
1742         req->VolatileFileId = volatile_fid;
1743
1744         iov[0].iov_base = (char *)req;
1745         /* 4 for rfc1002 length field */
1746         iov[0].iov_len = get_rfc1002_length(req) + 4;
1747
1748         rc = SendReceive2(xid, ses, iov, 1, &resp_buftype, 0);
1749
1750         if (rc != 0)
1751                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
1752
1753         free_rsp_buf(resp_buftype, iov[0].iov_base);
1754         return rc;
1755 }
1756
1757 /*
1758  * To form a chain of read requests, any read requests after the first should
1759  * have the end_of_chain boolean set to true.
1760  */
1761 static int
1762 smb2_new_read_req(struct kvec *iov, struct cifs_io_parms *io_parms,
1763                   unsigned int remaining_bytes, int request_type)
1764 {
1765         int rc = -EACCES;
1766         struct smb2_read_req *req = NULL;
1767
1768         rc = small_smb2_init(SMB2_READ, io_parms->tcon, (void **) &req);
1769         if (rc)
1770                 return rc;
1771         if (io_parms->tcon->ses->server == NULL)
1772                 return -ECONNABORTED;
1773
1774         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
1775
1776         req->PersistentFileId = io_parms->persistent_fid;
1777         req->VolatileFileId = io_parms->volatile_fid;
1778         req->ReadChannelInfoOffset = 0; /* reserved */
1779         req->ReadChannelInfoLength = 0; /* reserved */
1780         req->Channel = 0; /* reserved */
1781         req->MinimumCount = 0;
1782         req->Length = cpu_to_le32(io_parms->length);
1783         req->Offset = cpu_to_le64(io_parms->offset);
1784
1785         if (request_type & CHAINED_REQUEST) {
1786                 if (!(request_type & END_OF_CHAIN)) {
1787                         /* 4 for rfc1002 length field */
1788                         req->hdr.NextCommand =
1789                                 cpu_to_le32(get_rfc1002_length(req) + 4);
1790                 } else /* END_OF_CHAIN */
1791                         req->hdr.NextCommand = 0;
1792                 if (request_type & RELATED_REQUEST) {
1793                         req->hdr.Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
1794                         /*
1795                          * Related requests use info from previous read request
1796                          * in chain.
1797                          */
1798                         req->hdr.SessionId = 0xFFFFFFFF;
1799                         req->hdr.TreeId = 0xFFFFFFFF;
1800                         req->PersistentFileId = 0xFFFFFFFF;
1801                         req->VolatileFileId = 0xFFFFFFFF;
1802                 }
1803         }
1804         if (remaining_bytes > io_parms->length)
1805                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
1806         else
1807                 req->RemainingBytes = 0;
1808
1809         iov[0].iov_base = (char *)req;
1810         /* 4 for rfc1002 length field */
1811         iov[0].iov_len = get_rfc1002_length(req) + 4;
1812         return rc;
1813 }
1814
1815 static void
1816 smb2_readv_callback(struct mid_q_entry *mid)
1817 {
1818         struct cifs_readdata *rdata = mid->callback_data;
1819         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
1820         struct TCP_Server_Info *server = tcon->ses->server;
1821         struct smb2_hdr *buf = (struct smb2_hdr *)rdata->iov.iov_base;
1822         unsigned int credits_received = 1;
1823         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1824                                  .rq_nvec = 1,
1825                                  .rq_pages = rdata->pages,
1826                                  .rq_npages = rdata->nr_pages,
1827                                  .rq_pagesz = rdata->pagesz,
1828                                  .rq_tailsz = rdata->tailsz };
1829
1830         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
1831                  __func__, mid->mid, mid->mid_state, rdata->result,
1832                  rdata->bytes);
1833
1834         switch (mid->mid_state) {
1835         case MID_RESPONSE_RECEIVED:
1836                 credits_received = le16_to_cpu(buf->CreditRequest);
1837                 /* result already set, check signature */
1838                 if (server->sign) {
1839                         int rc;
1840
1841                         rc = smb2_verify_signature(&rqst, server);
1842                         if (rc)
1843                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
1844                                          rc);
1845                 }
1846                 /* FIXME: should this be counted toward the initiating task? */
1847                 task_io_account_read(rdata->got_bytes);
1848                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
1849                 break;
1850         case MID_REQUEST_SUBMITTED:
1851         case MID_RETRY_NEEDED:
1852                 rdata->result = -EAGAIN;
1853                 if (server->sign && rdata->got_bytes)
1854                         /* reset bytes number since we can not check a sign */
1855                         rdata->got_bytes = 0;
1856                 /* FIXME: should this be counted toward the initiating task? */
1857                 task_io_account_read(rdata->got_bytes);
1858                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
1859                 break;
1860         default:
1861                 if (rdata->result != -ENODATA)
1862                         rdata->result = -EIO;
1863         }
1864
1865         if (rdata->result)
1866                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
1867
1868         queue_work(cifsiod_wq, &rdata->work);
1869         mutex_lock(&server->srv_mutex);
1870         DeleteMidQEntry(mid);
1871         mutex_unlock(&server->srv_mutex);
1872         add_credits(server, credits_received, 0);
1873 }
1874
1875 /* smb2_async_readv - send an async write, and set up mid to handle result */
1876 int
1877 smb2_async_readv(struct cifs_readdata *rdata)
1878 {
1879         int rc, flags = 0;
1880         struct smb2_hdr *buf;
1881         struct cifs_io_parms io_parms;
1882         struct smb_rqst rqst = { .rq_iov = &rdata->iov,
1883                                  .rq_nvec = 1 };
1884         struct TCP_Server_Info *server;
1885
1886         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
1887                  __func__, rdata->offset, rdata->bytes);
1888
1889         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
1890         io_parms.offset = rdata->offset;
1891         io_parms.length = rdata->bytes;
1892         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
1893         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
1894         io_parms.pid = rdata->pid;
1895
1896         server = io_parms.tcon->ses->server;
1897
1898         rc = smb2_new_read_req(&rdata->iov, &io_parms, 0, 0);
1899         if (rc) {
1900                 if (rc == -EAGAIN && rdata->credits) {
1901                         /* credits was reset by reconnect */
1902                         rdata->credits = 0;
1903                         /* reduce in_flight value since we won't send the req */
1904                         spin_lock(&server->req_lock);
1905                         server->in_flight--;
1906                         spin_unlock(&server->req_lock);
1907                 }
1908                 return rc;
1909         }
1910
1911         buf = (struct smb2_hdr *)rdata->iov.iov_base;
1912         /* 4 for rfc1002 length field */
1913         rdata->iov.iov_len = get_rfc1002_length(rdata->iov.iov_base) + 4;
1914
1915         if (rdata->credits) {
1916                 buf->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
1917                                                 SMB2_MAX_BUFFER_SIZE));
1918                 spin_lock(&server->req_lock);
1919                 server->credits += rdata->credits -
1920                                                 le16_to_cpu(buf->CreditCharge);
1921                 spin_unlock(&server->req_lock);
1922                 wake_up(&server->request_q);
1923                 flags = CIFS_HAS_CREDITS;
1924         }
1925
1926         kref_get(&rdata->refcount);
1927         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
1928                              cifs_readv_receive, smb2_readv_callback,
1929                              rdata, flags);
1930         if (rc) {
1931                 kref_put(&rdata->refcount, cifs_readdata_release);
1932                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
1933         }
1934
1935         cifs_small_buf_release(buf);
1936         return rc;
1937 }
1938
1939 int
1940 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
1941           unsigned int *nbytes, char **buf, int *buf_type)
1942 {
1943         int resp_buftype, rc = -EACCES;
1944         struct smb2_read_rsp *rsp = NULL;
1945         struct kvec iov[1];
1946
1947         *nbytes = 0;
1948         rc = smb2_new_read_req(iov, io_parms, 0, 0);
1949         if (rc)
1950                 return rc;
1951
1952         rc = SendReceive2(xid, io_parms->tcon->ses, iov, 1,
1953                           &resp_buftype, CIFS_LOG_ERROR);
1954
1955         rsp = (struct smb2_read_rsp *)iov[0].iov_base;
1956
1957         if (rsp->hdr.Status == STATUS_END_OF_FILE) {
1958                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1959                 return 0;
1960         }
1961
1962         if (rc) {
1963                 cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
1964                 cifs_dbg(VFS, "Send error in read = %d\n", rc);
1965         } else {
1966                 *nbytes = le32_to_cpu(rsp->DataLength);
1967                 if ((*nbytes > CIFS_MAX_MSGSIZE) ||
1968                     (*nbytes > io_parms->length)) {
1969                         cifs_dbg(FYI, "bad length %d for count %d\n",
1970                                  *nbytes, io_parms->length);
1971                         rc = -EIO;
1972                         *nbytes = 0;
1973                 }
1974         }
1975
1976         if (*buf) {
1977                 memcpy(*buf, (char *)rsp->hdr.ProtocolId + rsp->DataOffset,
1978                        *nbytes);
1979                 free_rsp_buf(resp_buftype, iov[0].iov_base);
1980         } else if (resp_buftype != CIFS_NO_BUFFER) {
1981                 *buf = iov[0].iov_base;
1982                 if (resp_buftype == CIFS_SMALL_BUFFER)
1983                         *buf_type = CIFS_SMALL_BUFFER;
1984                 else if (resp_buftype == CIFS_LARGE_BUFFER)
1985                         *buf_type = CIFS_LARGE_BUFFER;
1986         }
1987         return rc;
1988 }
1989
1990 /*
1991  * Check the mid_state and signature on received buffer (if any), and queue the
1992  * workqueue completion task.
1993  */
1994 static void
1995 smb2_writev_callback(struct mid_q_entry *mid)
1996 {
1997         struct cifs_writedata *wdata = mid->callback_data;
1998         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
1999         struct TCP_Server_Info *server = tcon->ses->server;
2000         unsigned int written;
2001         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
2002         unsigned int credits_received = 1;
2003
2004         switch (mid->mid_state) {
2005         case MID_RESPONSE_RECEIVED:
2006                 credits_received = le16_to_cpu(rsp->hdr.CreditRequest);
2007                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
2008                 if (wdata->result != 0)
2009                         break;
2010
2011                 written = le32_to_cpu(rsp->DataLength);
2012                 /*
2013                  * Mask off high 16 bits when bytes written as returned
2014                  * by the server is greater than bytes requested by the
2015                  * client. OS/2 servers are known to set incorrect
2016                  * CountHigh values.
2017                  */
2018                 if (written > wdata->bytes)
2019                         written &= 0xFFFF;
2020
2021                 if (written < wdata->bytes)
2022                         wdata->result = -ENOSPC;
2023                 else
2024                         wdata->bytes = written;
2025                 break;
2026         case MID_REQUEST_SUBMITTED:
2027         case MID_RETRY_NEEDED:
2028                 wdata->result = -EAGAIN;
2029                 break;
2030         default:
2031                 wdata->result = -EIO;
2032                 break;
2033         }
2034
2035         if (wdata->result)
2036                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2037
2038         queue_work(cifsiod_wq, &wdata->work);
2039         mutex_lock(&server->srv_mutex);
2040         DeleteMidQEntry(mid);
2041         mutex_unlock(&server->srv_mutex);
2042         add_credits(tcon->ses->server, credits_received, 0);
2043 }
2044
2045 /* smb2_async_writev - send an async write, and set up mid to handle result */
2046 int
2047 smb2_async_writev(struct cifs_writedata *wdata,
2048                   void (*release)(struct kref *kref))
2049 {
2050         int rc = -EACCES, flags = 0;
2051         struct smb2_write_req *req = NULL;
2052         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
2053         struct TCP_Server_Info *server = tcon->ses->server;
2054         struct kvec iov;
2055         struct smb_rqst rqst;
2056
2057         rc = small_smb2_init(SMB2_WRITE, tcon, (void **) &req);
2058         if (rc) {
2059                 if (rc == -EAGAIN && wdata->credits) {
2060                         /* credits was reset by reconnect */
2061                         wdata->credits = 0;
2062                         /* reduce in_flight value since we won't send the req */
2063                         spin_lock(&server->req_lock);
2064                         server->in_flight--;
2065                         spin_unlock(&server->req_lock);
2066                 }
2067                 goto async_writev_out;
2068         }
2069
2070         req->hdr.ProcessId = cpu_to_le32(wdata->cfile->pid);
2071
2072         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
2073         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
2074         req->WriteChannelInfoOffset = 0;
2075         req->WriteChannelInfoLength = 0;
2076         req->Channel = 0;
2077         req->Offset = cpu_to_le64(wdata->offset);
2078         /* 4 for rfc1002 length field */
2079         req->DataOffset = cpu_to_le16(
2080                                 offsetof(struct smb2_write_req, Buffer) - 4);
2081         req->RemainingBytes = 0;
2082
2083         /* 4 for rfc1002 length field and 1 for Buffer */
2084         iov.iov_len = get_rfc1002_length(req) + 4 - 1;
2085         iov.iov_base = req;
2086
2087         rqst.rq_iov = &iov;
2088         rqst.rq_nvec = 1;
2089         rqst.rq_pages = wdata->pages;
2090         rqst.rq_npages = wdata->nr_pages;
2091         rqst.rq_pagesz = wdata->pagesz;
2092         rqst.rq_tailsz = wdata->tailsz;
2093
2094         cifs_dbg(FYI, "async write at %llu %u bytes\n",
2095                  wdata->offset, wdata->bytes);
2096
2097         req->Length = cpu_to_le32(wdata->bytes);
2098
2099         inc_rfc1001_len(&req->hdr, wdata->bytes - 1 /* Buffer */);
2100
2101         if (wdata->credits) {
2102                 req->hdr.CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
2103                                                     SMB2_MAX_BUFFER_SIZE));
2104                 spin_lock(&server->req_lock);
2105                 server->credits += wdata->credits -
2106                                         le16_to_cpu(req->hdr.CreditCharge);
2107                 spin_unlock(&server->req_lock);
2108                 wake_up(&server->request_q);
2109                 flags = CIFS_HAS_CREDITS;
2110         }
2111
2112         kref_get(&wdata->refcount);
2113         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, wdata,
2114                              flags);
2115
2116         if (rc) {
2117                 kref_put(&wdata->refcount, release);
2118                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
2119         }
2120
2121 async_writev_out:
2122         cifs_small_buf_release(req);
2123         return rc;
2124 }
2125
2126 /*
2127  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
2128  * The length field from io_parms must be at least 1 and indicates a number of
2129  * elements with data to write that begins with position 1 in iov array. All
2130  * data length is specified by count.
2131  */
2132 int
2133 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
2134            unsigned int *nbytes, struct kvec *iov, int n_vec)
2135 {
2136         int rc = 0;
2137         struct smb2_write_req *req = NULL;
2138         struct smb2_write_rsp *rsp = NULL;
2139         int resp_buftype;
2140         *nbytes = 0;
2141
2142         if (n_vec < 1)
2143                 return rc;
2144
2145         rc = small_smb2_init(SMB2_WRITE, io_parms->tcon, (void **) &req);
2146         if (rc)
2147                 return rc;
2148
2149         if (io_parms->tcon->ses->server == NULL)
2150                 return -ECONNABORTED;
2151
2152         req->hdr.ProcessId = cpu_to_le32(io_parms->pid);
2153
2154         req->PersistentFileId = io_parms->persistent_fid;
2155         req->VolatileFileId = io_parms->volatile_fid;
2156         req->WriteChannelInfoOffset = 0;
2157         req->WriteChannelInfoLength = 0;
2158         req->Channel = 0;
2159         req->Length = cpu_to_le32(io_parms->length);
2160         req->Offset = cpu_to_le64(io_parms->offset);
2161         /* 4 for rfc1002 length field */
2162         req->DataOffset = cpu_to_le16(
2163                                 offsetof(struct smb2_write_req, Buffer) - 4);
2164         req->RemainingBytes = 0;
2165
2166         iov[0].iov_base = (char *)req;
2167         /* 4 for rfc1002 length field and 1 for Buffer */
2168         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2169
2170         /* length of entire message including data to be written */
2171         inc_rfc1001_len(req, io_parms->length - 1 /* Buffer */);
2172
2173         rc = SendReceive2(xid, io_parms->tcon->ses, iov, n_vec + 1,
2174                           &resp_buftype, 0);
2175         rsp = (struct smb2_write_rsp *)iov[0].iov_base;
2176
2177         if (rc) {
2178                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
2179                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
2180         } else
2181                 *nbytes = le32_to_cpu(rsp->DataLength);
2182
2183         free_rsp_buf(resp_buftype, rsp);
2184         return rc;
2185 }
2186
2187 static unsigned int
2188 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
2189 {
2190         int len;
2191         unsigned int entrycount = 0;
2192         unsigned int next_offset = 0;
2193         FILE_DIRECTORY_INFO *entryptr;
2194
2195         if (bufstart == NULL)
2196                 return 0;
2197
2198         entryptr = (FILE_DIRECTORY_INFO *)bufstart;
2199
2200         while (1) {
2201                 entryptr = (FILE_DIRECTORY_INFO *)
2202                                         ((char *)entryptr + next_offset);
2203
2204                 if ((char *)entryptr + size > end_of_buf) {
2205                         cifs_dbg(VFS, "malformed search entry would overflow\n");
2206                         break;
2207                 }
2208
2209                 len = le32_to_cpu(entryptr->FileNameLength);
2210                 if ((char *)entryptr + len + size > end_of_buf) {
2211                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
2212                                  end_of_buf);
2213                         break;
2214                 }
2215
2216                 *lastentry = (char *)entryptr;
2217                 entrycount++;
2218
2219                 next_offset = le32_to_cpu(entryptr->NextEntryOffset);
2220                 if (!next_offset)
2221                         break;
2222         }
2223
2224         return entrycount;
2225 }
2226
2227 /*
2228  * Readdir/FindFirst
2229  */
2230 int
2231 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
2232                      u64 persistent_fid, u64 volatile_fid, int index,
2233                      struct cifs_search_info *srch_inf)
2234 {
2235         struct smb2_query_directory_req *req;
2236         struct smb2_query_directory_rsp *rsp = NULL;
2237         struct kvec iov[2];
2238         int rc = 0;
2239         int len;
2240         int resp_buftype = CIFS_NO_BUFFER;
2241         unsigned char *bufptr;
2242         struct TCP_Server_Info *server;
2243         struct cifs_ses *ses = tcon->ses;
2244         __le16 asteriks = cpu_to_le16('*');
2245         char *end_of_smb;
2246         unsigned int output_size = CIFSMaxBufSize;
2247         size_t info_buf_size;
2248
2249         if (ses && (ses->server))
2250                 server = ses->server;
2251         else
2252                 return -EIO;
2253
2254         rc = small_smb2_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req);
2255         if (rc)
2256                 return rc;
2257
2258         switch (srch_inf->info_level) {
2259         case SMB_FIND_FILE_DIRECTORY_INFO:
2260                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
2261                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
2262                 break;
2263         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
2264                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
2265                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
2266                 break;
2267         default:
2268                 cifs_dbg(VFS, "info level %u isn't supported\n",
2269                          srch_inf->info_level);
2270                 rc = -EINVAL;
2271                 goto qdir_exit;
2272         }
2273
2274         req->FileIndex = cpu_to_le32(index);
2275         req->PersistentFileId = persistent_fid;
2276         req->VolatileFileId = volatile_fid;
2277
2278         len = 0x2;
2279         bufptr = req->Buffer;
2280         memcpy(bufptr, &asteriks, len);
2281
2282         req->FileNameOffset =
2283                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1 - 4);
2284         req->FileNameLength = cpu_to_le16(len);
2285         /*
2286          * BB could be 30 bytes or so longer if we used SMB2 specific
2287          * buffer lengths, but this is safe and close enough.
2288          */
2289         output_size = min_t(unsigned int, output_size, server->maxBuf);
2290         output_size = min_t(unsigned int, output_size, 2 << 15);
2291         req->OutputBufferLength = cpu_to_le32(output_size);
2292
2293         iov[0].iov_base = (char *)req;
2294         /* 4 for RFC1001 length and 1 for Buffer */
2295         iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
2296
2297         iov[1].iov_base = (char *)(req->Buffer);
2298         iov[1].iov_len = len;
2299
2300         inc_rfc1001_len(req, len - 1 /* Buffer */);
2301
2302         rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
2303         rsp = (struct smb2_query_directory_rsp *)iov[0].iov_base;
2304
2305         if (rc) {
2306                 if (rc == -ENODATA && rsp->hdr.Status == STATUS_NO_MORE_FILES) {
2307                         srch_inf->endOfSearch = true;
2308                         rc = 0;
2309                 }
2310                 cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
2311                 goto qdir_exit;
2312         }
2313
2314         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2315                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2316                           info_buf_size);
2317         if (rc)
2318                 goto qdir_exit;
2319
2320         srch_inf->unicode = true;
2321
2322         if (srch_inf->ntwrk_buf_start) {
2323                 if (srch_inf->smallBuf)
2324                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
2325                 else
2326                         cifs_buf_release(srch_inf->ntwrk_buf_start);
2327         }
2328         srch_inf->ntwrk_buf_start = (char *)rsp;
2329         srch_inf->srch_entries_start = srch_inf->last_entry = 4 /* rfclen */ +
2330                 (char *)&rsp->hdr + le16_to_cpu(rsp->OutputBufferOffset);
2331         /* 4 for rfc1002 length field */
2332         end_of_smb = get_rfc1002_length(rsp) + 4 + (char *)&rsp->hdr;
2333         srch_inf->entries_in_buffer =
2334                         num_entries(srch_inf->srch_entries_start, end_of_smb,
2335                                     &srch_inf->last_entry, info_buf_size);
2336         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
2337         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
2338                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
2339                  srch_inf->srch_entries_start, srch_inf->last_entry);
2340         if (resp_buftype == CIFS_LARGE_BUFFER)
2341                 srch_inf->smallBuf = false;
2342         else if (resp_buftype == CIFS_SMALL_BUFFER)
2343                 srch_inf->smallBuf = true;
2344         else
2345                 cifs_dbg(VFS, "illegal search buffer type\n");
2346
2347         return rc;
2348
2349 qdir_exit:
2350         free_rsp_buf(resp_buftype, rsp);
2351         return rc;
2352 }
2353
2354 static int
2355 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2356                u64 persistent_fid, u64 volatile_fid, u32 pid, int info_class,
2357                unsigned int num, void **data, unsigned int *size)
2358 {
2359         struct smb2_set_info_req *req;
2360         struct smb2_set_info_rsp *rsp = NULL;
2361         struct kvec *iov;
2362         int rc = 0;
2363         int resp_buftype;
2364         unsigned int i;
2365         struct TCP_Server_Info *server;
2366         struct cifs_ses *ses = tcon->ses;
2367
2368         if (ses && (ses->server))
2369                 server = ses->server;
2370         else
2371                 return -EIO;
2372
2373         if (!num)
2374                 return -EINVAL;
2375
2376         iov = kmalloc(sizeof(struct kvec) * num, GFP_KERNEL);
2377         if (!iov)
2378                 return -ENOMEM;
2379
2380         rc = small_smb2_init(SMB2_SET_INFO, tcon, (void **) &req);
2381         if (rc) {
2382                 kfree(iov);
2383                 return rc;
2384         }
2385
2386         req->hdr.ProcessId = cpu_to_le32(pid);
2387
2388         req->InfoType = SMB2_O_INFO_FILE;
2389         req->FileInfoClass = info_class;
2390         req->PersistentFileId = persistent_fid;
2391         req->VolatileFileId = volatile_fid;
2392
2393         /* 4 for RFC1001 length and 1 for Buffer */
2394         req->BufferOffset =
2395                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1 - 4);
2396         req->BufferLength = cpu_to_le32(*size);
2397
2398         inc_rfc1001_len(req, *size - 1 /* Buffer */);
2399
2400         memcpy(req->Buffer, *data, *size);
2401
2402         iov[0].iov_base = (char *)req;
2403         /* 4 for RFC1001 length */
2404         iov[0].iov_len = get_rfc1002_length(req) + 4;
2405
2406         for (i = 1; i < num; i++) {
2407                 inc_rfc1001_len(req, size[i]);
2408                 le32_add_cpu(&req->BufferLength, size[i]);
2409                 iov[i].iov_base = (char *)data[i];
2410                 iov[i].iov_len = size[i];
2411         }
2412
2413         rc = SendReceive2(xid, ses, iov, num, &resp_buftype, 0);
2414         rsp = (struct smb2_set_info_rsp *)iov[0].iov_base;
2415
2416         if (rc != 0)
2417                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
2418
2419         free_rsp_buf(resp_buftype, rsp);
2420         kfree(iov);
2421         return rc;
2422 }
2423
2424 int
2425 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
2426             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2427 {
2428         struct smb2_file_rename_info info;
2429         void **data;
2430         unsigned int size[2];
2431         int rc;
2432         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2433
2434         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2435         if (!data)
2436                 return -ENOMEM;
2437
2438         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
2439                               /* 0 = fail if target already exists */
2440         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2441         info.FileNameLength = cpu_to_le32(len);
2442
2443         data[0] = &info;
2444         size[0] = sizeof(struct smb2_file_rename_info);
2445
2446         data[1] = target_file;
2447         size[1] = len + 2 /* null */;
2448
2449         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2450                            current->tgid, FILE_RENAME_INFORMATION, 2, data,
2451                            size);
2452         kfree(data);
2453         return rc;
2454 }
2455
2456 int
2457 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
2458                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
2459 {
2460         struct smb2_file_link_info info;
2461         void **data;
2462         unsigned int size[2];
2463         int rc;
2464         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
2465
2466         data = kmalloc(sizeof(void *) * 2, GFP_KERNEL);
2467         if (!data)
2468                 return -ENOMEM;
2469
2470         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
2471                               /* 0 = fail if link already exists */
2472         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
2473         info.FileNameLength = cpu_to_le32(len);
2474
2475         data[0] = &info;
2476         size[0] = sizeof(struct smb2_file_link_info);
2477
2478         data[1] = target_file;
2479         size[1] = len + 2 /* null */;
2480
2481         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
2482                            current->tgid, FILE_LINK_INFORMATION, 2, data, size);
2483         kfree(data);
2484         return rc;
2485 }
2486
2487 int
2488 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2489              u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
2490 {
2491         struct smb2_file_eof_info info;
2492         void *data;
2493         unsigned int size;
2494
2495         info.EndOfFile = *eof;
2496
2497         data = &info;
2498         size = sizeof(struct smb2_file_eof_info);
2499
2500         if (is_falloc)
2501                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2502                         pid, FILE_ALLOCATION_INFORMATION, 1, &data, &size);
2503         else
2504                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2505                         pid, FILE_END_OF_FILE_INFORMATION, 1, &data, &size);
2506 }
2507
2508 int
2509 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
2510               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
2511 {
2512         unsigned int size;
2513         size = sizeof(FILE_BASIC_INFO);
2514         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
2515                              current->tgid, FILE_BASIC_INFORMATION, 1,
2516                              (void **)&buf, &size);
2517 }
2518
2519 int
2520 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
2521                   const u64 persistent_fid, const u64 volatile_fid,
2522                   __u8 oplock_level)
2523 {
2524         int rc;
2525         struct smb2_oplock_break *req = NULL;
2526
2527         cifs_dbg(FYI, "SMB2_oplock_break\n");
2528         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2529
2530         if (rc)
2531                 return rc;
2532
2533         req->VolatileFid = volatile_fid;
2534         req->PersistentFid = persistent_fid;
2535         req->OplockLevel = oplock_level;
2536         req->hdr.CreditRequest = cpu_to_le16(1);
2537
2538         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2539         /* SMB2 buffer freed by function above */
2540
2541         if (rc) {
2542                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2543                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
2544         }
2545
2546         return rc;
2547 }
2548
2549 static void
2550 copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
2551                         struct kstatfs *kst)
2552 {
2553         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
2554                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
2555         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
2556         kst->f_bfree  = le64_to_cpu(pfs_inf->ActualAvailableAllocationUnits);
2557         kst->f_bavail = le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
2558         return;
2559 }
2560
2561 static int
2562 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
2563                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
2564 {
2565         int rc;
2566         struct smb2_query_info_req *req;
2567
2568         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
2569
2570         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
2571                 return -EIO;
2572
2573         rc = small_smb2_init(SMB2_QUERY_INFO, tcon, (void **) &req);
2574         if (rc)
2575                 return rc;
2576
2577         req->InfoType = SMB2_O_INFO_FILESYSTEM;
2578         req->FileInfoClass = level;
2579         req->PersistentFileId = persistent_fid;
2580         req->VolatileFileId = volatile_fid;
2581         /* 4 for rfc1002 length field and 1 for pad */
2582         req->InputBufferOffset =
2583                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1 - 4);
2584         req->OutputBufferLength = cpu_to_le32(
2585                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1 - 4);
2586
2587         iov->iov_base = (char *)req;
2588         /* 4 for rfc1002 length field */
2589         iov->iov_len = get_rfc1002_length(req) + 4;
2590         return 0;
2591 }
2592
2593 int
2594 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
2595               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
2596 {
2597         struct smb2_query_info_rsp *rsp = NULL;
2598         struct kvec iov;
2599         int rc = 0;
2600         int resp_buftype;
2601         struct cifs_ses *ses = tcon->ses;
2602         struct smb2_fs_full_size_info *info = NULL;
2603
2604         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
2605                                 sizeof(struct smb2_fs_full_size_info),
2606                                 persistent_fid, volatile_fid);
2607         if (rc)
2608                 return rc;
2609
2610         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2611         if (rc) {
2612                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2613                 goto qfsinf_exit;
2614         }
2615         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2616
2617         info = (struct smb2_fs_full_size_info *)(4 /* RFC1001 len */ +
2618                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)&rsp->hdr);
2619         rc = validate_buf(le16_to_cpu(rsp->OutputBufferOffset),
2620                           le32_to_cpu(rsp->OutputBufferLength), &rsp->hdr,
2621                           sizeof(struct smb2_fs_full_size_info));
2622         if (!rc)
2623                 copy_fs_info_to_kstatfs(info, fsdata);
2624
2625 qfsinf_exit:
2626         free_rsp_buf(resp_buftype, iov.iov_base);
2627         return rc;
2628 }
2629
2630 int
2631 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
2632               u64 persistent_fid, u64 volatile_fid, int level)
2633 {
2634         struct smb2_query_info_rsp *rsp = NULL;
2635         struct kvec iov;
2636         int rc = 0;
2637         int resp_buftype, max_len, min_len;
2638         struct cifs_ses *ses = tcon->ses;
2639         unsigned int rsp_len, offset;
2640
2641         if (level == FS_DEVICE_INFORMATION) {
2642                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2643                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
2644         } else if (level == FS_ATTRIBUTE_INFORMATION) {
2645                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
2646                 min_len = MIN_FS_ATTR_INFO_SIZE;
2647         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
2648                 max_len = sizeof(struct smb3_fs_ss_info);
2649                 min_len = sizeof(struct smb3_fs_ss_info);
2650         } else {
2651                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
2652                 return -EINVAL;
2653         }
2654
2655         rc = build_qfs_info_req(&iov, tcon, level, max_len,
2656                                 persistent_fid, volatile_fid);
2657         if (rc)
2658                 return rc;
2659
2660         rc = SendReceive2(xid, ses, &iov, 1, &resp_buftype, 0);
2661         if (rc) {
2662                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2663                 goto qfsattr_exit;
2664         }
2665         rsp = (struct smb2_query_info_rsp *)iov.iov_base;
2666
2667         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
2668         offset = le16_to_cpu(rsp->OutputBufferOffset);
2669         rc = validate_buf(offset, rsp_len, &rsp->hdr, min_len);
2670         if (rc)
2671                 goto qfsattr_exit;
2672
2673         if (level == FS_ATTRIBUTE_INFORMATION)
2674                 memcpy(&tcon->fsAttrInfo, 4 /* RFC1001 len */ + offset
2675                         + (char *)&rsp->hdr, min_t(unsigned int,
2676                         rsp_len, max_len));
2677         else if (level == FS_DEVICE_INFORMATION)
2678                 memcpy(&tcon->fsDevInfo, 4 /* RFC1001 len */ + offset
2679                         + (char *)&rsp->hdr, sizeof(FILE_SYSTEM_DEVICE_INFO));
2680         else if (level == FS_SECTOR_SIZE_INFORMATION) {
2681                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
2682                         (4 /* RFC1001 len */ + offset + (char *)&rsp->hdr);
2683                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
2684                 tcon->perf_sector_size =
2685                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
2686         }
2687
2688 qfsattr_exit:
2689         free_rsp_buf(resp_buftype, iov.iov_base);
2690         return rc;
2691 }
2692
2693 int
2694 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
2695            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2696            const __u32 num_lock, struct smb2_lock_element *buf)
2697 {
2698         int rc = 0;
2699         struct smb2_lock_req *req = NULL;
2700         struct kvec iov[2];
2701         int resp_buf_type;
2702         unsigned int count;
2703
2704         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
2705
2706         rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
2707         if (rc)
2708                 return rc;
2709
2710         req->hdr.ProcessId = cpu_to_le32(pid);
2711         req->LockCount = cpu_to_le16(num_lock);
2712
2713         req->PersistentFileId = persist_fid;
2714         req->VolatileFileId = volatile_fid;
2715
2716         count = num_lock * sizeof(struct smb2_lock_element);
2717         inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
2718
2719         iov[0].iov_base = (char *)req;
2720         /* 4 for rfc1002 length field and count for all locks */
2721         iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
2722         iov[1].iov_base = (char *)buf;
2723         iov[1].iov_len = count;
2724
2725         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
2726         rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
2727         if (rc) {
2728                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
2729                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
2730         }
2731
2732         return rc;
2733 }
2734
2735 int
2736 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
2737           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
2738           const __u64 length, const __u64 offset, const __u32 lock_flags,
2739           const bool wait)
2740 {
2741         struct smb2_lock_element lock;
2742
2743         lock.Offset = cpu_to_le64(offset);
2744         lock.Length = cpu_to_le64(length);
2745         lock.Flags = cpu_to_le32(lock_flags);
2746         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
2747                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
2748
2749         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
2750 }
2751
2752 int
2753 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
2754                  __u8 *lease_key, const __le32 lease_state)
2755 {
2756         int rc;
2757         struct smb2_lease_ack *req = NULL;
2758
2759         cifs_dbg(FYI, "SMB2_lease_break\n");
2760         rc = small_smb2_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req);
2761
2762         if (rc)
2763                 return rc;
2764
2765         req->hdr.CreditRequest = cpu_to_le16(1);
2766         req->StructureSize = cpu_to_le16(36);
2767         inc_rfc1001_len(req, 12);
2768
2769         memcpy(req->LeaseKey, lease_key, 16);
2770         req->LeaseState = lease_state;
2771
2772         rc = SendReceiveNoRsp(xid, tcon->ses, (char *) req, CIFS_OBREAK_OP);
2773         /* SMB2 buffer freed by function above */
2774
2775         if (rc) {
2776                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
2777                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
2778         }
2779
2780         return rc;
2781 }