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 ([email protected])
   7  *              Pavel Shilovsky ([email protected]) 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/uuid.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/xattr.h>
  39 #include "smb2pdu.h"
  40 #include "cifsglob.h"
  41 #include "cifsacl.h"
  42 #include "cifsproto.h"
  43 #include "smb2proto.h"
  44 #include "cifs_unicode.h"
  45 #include "cifs_debug.h"
  46 #include "ntlmssp.h"
  47 #include "smb2status.h"
  48 #include "smb2glob.h"
  49 #include "cifspdu.h"
  50 #include "cifs_spnego.h"
  51 #include "smbdirect.h"
  52 #include "trace.h"
  53 #ifdef CONFIG_CIFS_DFS_UPCALL
  54 #include "dfs_cache.h"
  55 #endif
  56
  57 /*
  58  *  The following table defines the expected "StructureSize" of SMB2 requests
  59  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  60  *
  61  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  62  *  indexed by command in host byte order.
  63  */
  64 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  65         /* SMB2_NEGOTIATE */ 36,
  66         /* SMB2_SESSION_SETUP */ 25,
  67         /* SMB2_LOGOFF */ 4,
  68         /* SMB2_TREE_CONNECT */ 9,
  69         /* SMB2_TREE_DISCONNECT */ 4,
  70         /* SMB2_CREATE */ 57,
  71         /* SMB2_CLOSE */ 24,
  72         /* SMB2_FLUSH */ 24,
  73         /* SMB2_READ */ 49,
  74         /* SMB2_WRITE */ 49,
  75         /* SMB2_LOCK */ 48,
  76         /* SMB2_IOCTL */ 57,
  77         /* SMB2_CANCEL */ 4,
  78         /* SMB2_ECHO */ 4,
  79         /* SMB2_QUERY_DIRECTORY */ 33,
  80         /* SMB2_CHANGE_NOTIFY */ 32,
  81         /* SMB2_QUERY_INFO */ 41,
  82         /* SMB2_SET_INFO */ 33,
  83         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  84 };
  85
  86 int smb3_encryption_required(const struct cifs_tcon *tcon)
  87 {
  88         if (!tcon || !tcon->ses)
  89                 return 0;
  90         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  91             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  92                 return 1;
  93         if (tcon->seal &&
  94             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  95                 return 1;
  96         return 0;
  97 }
  98
  99 static void
 100 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
 101                   const struct cifs_tcon *tcon,
 102                   struct TCP_Server_Info *server)
 103 {
 104         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 105         shdr->StructureSize = cpu_to_le16(64);
 106         shdr->Command = smb2_cmd;
 107         if (server) {
 108                 spin_lock(&server->req_lock);
 109                 /* Request up to 10 credits but don't go over the limit. */
 110                 if (server->credits >= server->max_credits)
 111                         shdr->CreditRequest = cpu_to_le16(0);
 112                 else
 113                         shdr->CreditRequest = cpu_to_le16(
 114                                 min_t(int, server->max_credits -
 115                                                 server->credits, 10));
 116                 spin_unlock(&server->req_lock);
 117         } else {
 118                 shdr->CreditRequest = cpu_to_le16(2);
 119         }
 120         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 121
 122         if (!tcon)
 123                 goto out;
 124
 125         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 126         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 127         if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 128                 shdr->CreditCharge = cpu_to_le16(1);
 129         /* else CreditCharge MBZ */
 130
 131         shdr->TreeId = tcon->tid;
 132         /* Uid is not converted */
 133         if (tcon->ses)
 134                 shdr->SessionId = tcon->ses->Suid;
 135
 136         /*
 137          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 138          * to pass the path on the Open SMB prefixed by \\server\share.
 139          * Not sure when we would need to do the augmented path (if ever) and
 140          * setting this flag breaks the SMB2 open operation since it is
 141          * illegal to send an empty path name (without \\server\share prefix)
 142          * when the DFS flag is set in the SMB open header. We could
 143          * consider setting the flag on all operations other than open
 144          * but it is safer to net set it for now.
 145          */
 146 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 147                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 148
 149         if (server && server->sign && !smb3_encryption_required(tcon))
 150                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 151 out:
 152         return;
 153 }
 154
 155 static int
 156 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
 157                struct TCP_Server_Info *server)
 158 {
 159         int rc;
 160         struct nls_table *nls_codepage;
 161         struct cifs_ses *ses;
 162         int retries;
 163
 164         /*
 165          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 166          * check for tcp and smb session status done differently
 167          * for those three - in the calling routine.
 168          */
 169         if (tcon == NULL)
 170                 return 0;
 171
 172         if (smb2_command == SMB2_TREE_CONNECT)
 173                 return 0;
 174
 175         if (tcon->tidStatus == CifsExiting) {
 176                 /*
 177                  * only tree disconnect, open, and write,
 178                  * (and ulogoff which does not have tcon)
 179                  * are allowed as we start force umount.
 180                  */
 181                 if ((smb2_command != SMB2_WRITE) &&
 182                    (smb2_command != SMB2_CREATE) &&
 183                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 184                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 185                                  smb2_command);
 186                         return -ENODEV;
 187                 }
 188         }
 189         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 190             (!tcon->ses->server) || !server)
 191                 return -EIO;
 192
 193         ses = tcon->ses;
 194         retries = server->nr_targets;
 195
 196         /*
 197          * Give demultiplex thread up to 10 seconds to each target available for
 198          * reconnect -- should be greater than cifs socket timeout which is 7
 199          * seconds.
 200          */
 201         while (server->tcpStatus == CifsNeedReconnect) {
 202                 /*
 203                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 204                  * here since they are implicitly done when session drops.
 205                  */
 206                 switch (smb2_command) {
 207                 /*
 208                  * BB Should we keep oplock break and add flush to exceptions?
 209                  */
 210                 case SMB2_TREE_DISCONNECT:
 211                 case SMB2_CANCEL:
 212                 case SMB2_CLOSE:
 213                 case SMB2_OPLOCK_BREAK:
 214                         return -EAGAIN;
 215                 }
 216
 217                 rc = wait_event_interruptible_timeout(server->response_q,
 218                                                       (server->tcpStatus != CifsNeedReconnect),
 219                                                       10 * HZ);
 220                 if (rc < 0) {
 221                         cifs_dbg(FYI, "%s: aborting reconnect due to a received signal by the process\n",
 222                                  __func__);
 223                         return -ERESTARTSYS;
 224                 }
 225
 226                 /* are we still trying to reconnect? */
 227                 if (server->tcpStatus != CifsNeedReconnect)
 228                         break;
 229
 230                 if (retries && --retries)
 231                         continue;
 232
 233                 /*
 234                  * on "soft" mounts we wait once. Hard mounts keep
 235                  * retrying until process is killed or server comes
 236                  * back on-line
 237                  */
 238                 if (!tcon->retry) {
 239                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 240                         return -EHOSTDOWN;
 241                 }
 242                 retries = server->nr_targets;
 243         }
 244
 245         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 246                 return 0;
 247
 248         nls_codepage = load_nls_default();
 249
 250         /*
 251          * need to prevent multiple threads trying to simultaneously reconnect
 252          * the same SMB session
 253          */
 254         mutex_lock(&tcon->ses->session_mutex);
 255
 256         /*
 257          * Recheck after acquire mutex. If another thread is negotiating
 258          * and the server never sends an answer the socket will be closed
 259          * and tcpStatus set to reconnect.
 260          */
 261         if (server->tcpStatus == CifsNeedReconnect) {
 262                 rc = -EHOSTDOWN;
 263                 mutex_unlock(&tcon->ses->session_mutex);
 264                 goto out;
 265         }
 266
 267         /*
 268          * If we are reconnecting an extra channel, bind
 269          */
 270         if (server->is_channel) {
 271                 ses->binding = true;
 272                 ses->binding_chan = cifs_ses_find_chan(ses, server);
 273         }
 274
 275         rc = cifs_negotiate_protocol(0, tcon->ses);
 276         if (!rc && tcon->ses->need_reconnect) {
 277                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 278                 if ((rc == -EACCES) && !tcon->retry) {
 279                         rc = -EHOSTDOWN;
 280                         ses->binding = false;
 281                         ses->binding_chan = NULL;
 282                         mutex_unlock(&tcon->ses->session_mutex);
 283                         goto failed;
 284                 }
 285         }
 286         /*
 287          * End of channel binding
 288          */
 289         ses->binding = false;
 290         ses->binding_chan = NULL;
 291
 292         if (rc || !tcon->need_reconnect) {
 293                 mutex_unlock(&tcon->ses->session_mutex);
 294                 goto out;
 295         }
 296
 297         cifs_mark_open_files_invalid(tcon);
 298         if (tcon->use_persistent)
 299                 tcon->need_reopen_files = true;
 300
 301         rc = cifs_tree_connect(0, tcon, nls_codepage);
 302         mutex_unlock(&tcon->ses->session_mutex);
 303
 304         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 305         if (rc) {
 306                 /* If sess reconnected but tcon didn't, something strange ... */
 307                 pr_warn_once("reconnect tcon failed rc = %d\n", rc);
 308                 goto out;
 309         }
 310
 311         if (smb2_command != SMB2_INTERNAL_CMD)
 312                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
 313
 314         atomic_inc(&tconInfoReconnectCount);
 315 out:
 316         /*
 317          * Check if handle based operation so we know whether we can continue
 318          * or not without returning to caller to reset file handle.
 319          */
 320         /*
 321          * BB Is flush done by server on drop of tcp session? Should we special
 322          * case it and skip above?
 323          */
 324         switch (smb2_command) {
 325         case SMB2_FLUSH:
 326         case SMB2_READ:
 327         case SMB2_WRITE:
 328         case SMB2_LOCK:
 329         case SMB2_IOCTL:
 330         case SMB2_QUERY_DIRECTORY:
 331         case SMB2_CHANGE_NOTIFY:
 332         case SMB2_QUERY_INFO:
 333         case SMB2_SET_INFO:
 334                 rc = -EAGAIN;
 335         }
 336 failed:
 337         unload_nls(nls_codepage);
 338         return rc;
 339 }
 340
 341 static void
 342 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
 343                struct TCP_Server_Info *server,
 344                void *buf,
 345                unsigned int *total_len)
 346 {
 347         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 348         /* lookup word count ie StructureSize from table */
 349         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 350
 351         /*
 352          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 353          * largest operations (Create)
 354          */
 355         memset(buf, 0, 256);
 356
 357         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon, server);
 358         spdu->StructureSize2 = cpu_to_le16(parmsize);
 359
 360         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 361 }
 362
 363 /*
 364  * Allocate and return pointer to an SMB request hdr, and set basic
 365  * SMB information in the SMB header. If the return code is zero, this
 366  * function must have filled in request_buf pointer.
 367  */
 368 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 369                                  struct TCP_Server_Info *server,
 370                                  void **request_buf, unsigned int *total_len)
 371 {
 372         /* BB eventually switch this to SMB2 specific small buf size */
 373         if (smb2_command == SMB2_SET_INFO)
 374                 *request_buf = cifs_buf_get();
 375         else
 376                 *request_buf = cifs_small_buf_get();
 377         if (*request_buf == NULL) {
 378                 /* BB should we add a retry in here if not a writepage? */
 379                 return -ENOMEM;
 380         }
 381
 382         fill_small_buf(smb2_command, tcon, server,
 383                        (struct smb2_sync_hdr *)(*request_buf),
 384                        total_len);
 385
 386         if (tcon != NULL) {
 387                 uint16_t com_code = le16_to_cpu(smb2_command);
 388                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 389                 cifs_stats_inc(&tcon->num_smbs_sent);
 390         }
 391
 392         return 0;
 393 }
 394
 395 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 396                                struct TCP_Server_Info *server,
 397                                void **request_buf, unsigned int *total_len)
 398 {
 399         int rc;
 400
 401         rc = smb2_reconnect(smb2_command, tcon, server);
 402         if (rc)
 403                 return rc;
 404
 405         return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
 406                                      total_len);
 407 }
 408
 409 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 410                                struct TCP_Server_Info *server,
 411                                void **request_buf, unsigned int *total_len)
 412 {
 413         /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
 414         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
 415                 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 416                                              request_buf, total_len);
 417         }
 418         return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 419                                    request_buf, total_len);
 420 }
 421
 422 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 423
 424 static void
 425 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 426 {
 427         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 428         pneg_ctxt->DataLength = cpu_to_le16(38);
 429         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 430         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 431         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 432         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 433 }
 434
 435 static void
 436 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 437 {
 438         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 439         pneg_ctxt->DataLength =
 440                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 441                           - sizeof(struct smb2_neg_context));
 442         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 443         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 444         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 445         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 446 }
 447
 448 static void
 449 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 450 {
 451         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 452         pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + two ciphers */
 453         pneg_ctxt->CipherCount = cpu_to_le16(2);
 454         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 455         pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 456 }
 457
 458 static unsigned int
 459 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 460 {
 461         struct nls_table *cp = load_nls_default();
 462
 463         pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 464
 465         /* copy up to max of first 100 bytes of server name to NetName field */
 466         pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 467         /* context size is DataLength + minimal smb2_neg_context */
 468         return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
 469                         sizeof(struct smb2_neg_context), 8) * 8;
 470 }
 471
 472 static void
 473 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 474 {
 475         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 476         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 477         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 478         pneg_ctxt->Name[0] = 0x93;
 479         pneg_ctxt->Name[1] = 0xAD;
 480         pneg_ctxt->Name[2] = 0x25;
 481         pneg_ctxt->Name[3] = 0x50;
 482         pneg_ctxt->Name[4] = 0x9C;
 483         pneg_ctxt->Name[5] = 0xB4;
 484         pneg_ctxt->Name[6] = 0x11;
 485         pneg_ctxt->Name[7] = 0xE7;
 486         pneg_ctxt->Name[8] = 0xB4;
 487         pneg_ctxt->Name[9] = 0x23;
 488         pneg_ctxt->Name[10] = 0x83;
 489         pneg_ctxt->Name[11] = 0xDE;
 490         pneg_ctxt->Name[12] = 0x96;
 491         pneg_ctxt->Name[13] = 0x8B;
 492         pneg_ctxt->Name[14] = 0xCD;
 493         pneg_ctxt->Name[15] = 0x7C;
 494 }
 495
 496 static void
 497 assemble_neg_contexts(struct smb2_negotiate_req *req,
 498                       struct TCP_Server_Info *server, unsigned int *total_len)
 499 {
 500         char *pneg_ctxt;
 501         unsigned int ctxt_len;
 502
 503         if (*total_len > 200) {
 504                 /* In case length corrupted don't want to overrun smb buffer */
 505                 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 506                 return;
 507         }
 508
 509         /*
 510          * round up total_len of fixed part of SMB3 negotiate request to 8
 511          * byte boundary before adding negotiate contexts
 512          */
 513         *total_len = roundup(*total_len, 8);
 514
 515         pneg_ctxt = (*total_len) + (char *)req;
 516         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 517
 518         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 519         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 520         *total_len += ctxt_len;
 521         pneg_ctxt += ctxt_len;
 522
 523         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 524         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 525         *total_len += ctxt_len;
 526         pneg_ctxt += ctxt_len;
 527
 528         if (server->compress_algorithm) {
 529                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 530                                 pneg_ctxt);
 531                 ctxt_len = DIV_ROUND_UP(
 532                         sizeof(struct smb2_compression_capabilities_context),
 533                                 8) * 8;
 534                 *total_len += ctxt_len;
 535                 pneg_ctxt += ctxt_len;
 536                 req->NegotiateContextCount = cpu_to_le16(5);
 537         } else
 538                 req->NegotiateContextCount = cpu_to_le16(4);
 539
 540         ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 541                                         server->hostname);
 542         *total_len += ctxt_len;
 543         pneg_ctxt += ctxt_len;
 544
 545         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 546         *total_len += sizeof(struct smb2_posix_neg_context);
 547 }
 548
 549 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 550 {
 551         unsigned int len = le16_to_cpu(ctxt->DataLength);
 552
 553         /* If invalid preauth context warn but use what we requested, SHA-512 */
 554         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 555                 pr_warn_once("server sent bad preauth context\n");
 556                 return;
 557         }
 558         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 559                 pr_warn_once("Invalid SMB3 hash algorithm count\n");
 560         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 561                 pr_warn_once("unknown SMB3 hash algorithm\n");
 562 }
 563
 564 static void decode_compress_ctx(struct TCP_Server_Info *server,
 565                          struct smb2_compression_capabilities_context *ctxt)
 566 {
 567         unsigned int len = le16_to_cpu(ctxt->DataLength);
 568
 569         /* sizeof compress context is a one element compression capbility struct */
 570         if (len < 10) {
 571                 pr_warn_once("server sent bad compression cntxt\n");
 572                 return;
 573         }
 574         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 575                 pr_warn_once("Invalid SMB3 compress algorithm count\n");
 576                 return;
 577         }
 578         if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 579                 pr_warn_once("unknown compression algorithm\n");
 580                 return;
 581         }
 582         server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 583 }
 584
 585 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 586                               struct smb2_encryption_neg_context *ctxt)
 587 {
 588         unsigned int len = le16_to_cpu(ctxt->DataLength);
 589
 590         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 591         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 592                 pr_warn_once("server sent bad crypto ctxt len\n");
 593                 return -EINVAL;
 594         }
 595
 596         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 597                 pr_warn_once("Invalid SMB3.11 cipher count\n");
 598                 return -EINVAL;
 599         }
 600         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 601         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 602             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 603                 pr_warn_once("Invalid SMB3.11 cipher returned\n");
 604                 return -EINVAL;
 605         }
 606         server->cipher_type = ctxt->Ciphers[0];
 607         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 608         return 0;
 609 }
 610
 611 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 612                                      struct TCP_Server_Info *server,
 613                                      unsigned int len_of_smb)
 614 {
 615         struct smb2_neg_context *pctx;
 616         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 617         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 618         unsigned int len_of_ctxts, i;
 619         int rc = 0;
 620
 621         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 622         if (len_of_smb <= offset) {
 623                 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 624                 return -EINVAL;
 625         }
 626
 627         len_of_ctxts = len_of_smb - offset;
 628
 629         for (i = 0; i < ctxt_cnt; i++) {
 630                 int clen;
 631                 /* check that offset is not beyond end of SMB */
 632                 if (len_of_ctxts == 0)
 633                         break;
 634
 635                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 636                         break;
 637
 638                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 639                 clen = le16_to_cpu(pctx->DataLength);
 640                 if (clen > len_of_ctxts)
 641                         break;
 642
 643                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 644                         decode_preauth_context(
 645                                 (struct smb2_preauth_neg_context *)pctx);
 646                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 647                         rc = decode_encrypt_ctx(server,
 648                                 (struct smb2_encryption_neg_context *)pctx);
 649                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 650                         decode_compress_ctx(server,
 651                                 (struct smb2_compression_capabilities_context *)pctx);
 652                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 653                         server->posix_ext_supported = true;
 654                 else
 655                         cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 656                                 le16_to_cpu(pctx->ContextType));
 657
 658                 if (rc)
 659                         break;
 660                 /* offsets must be 8 byte aligned */
 661                 clen = (clen + 7) & ~0x7;
 662                 offset += clen + sizeof(struct smb2_neg_context);
 663                 len_of_ctxts -= clen;
 664         }
 665         return rc;
 666 }
 667
 668 static struct create_posix *
 669 create_posix_buf(umode_t mode)
 670 {
 671         struct create_posix *buf;
 672
 673         buf = kzalloc(sizeof(struct create_posix),
 674                         GFP_KERNEL);
 675         if (!buf)
 676                 return NULL;
 677
 678         buf->ccontext.DataOffset =
 679                 cpu_to_le16(offsetof(struct create_posix, Mode));
 680         buf->ccontext.DataLength = cpu_to_le32(4);
 681         buf->ccontext.NameOffset =
 682                 cpu_to_le16(offsetof(struct create_posix, Name));
 683         buf->ccontext.NameLength = cpu_to_le16(16);
 684
 685         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 686         buf->Name[0] = 0x93;
 687         buf->Name[1] = 0xAD;
 688         buf->Name[2] = 0x25;
 689         buf->Name[3] = 0x50;
 690         buf->Name[4] = 0x9C;
 691         buf->Name[5] = 0xB4;
 692         buf->Name[6] = 0x11;
 693         buf->Name[7] = 0xE7;
 694         buf->Name[8] = 0xB4;
 695         buf->Name[9] = 0x23;
 696         buf->Name[10] = 0x83;
 697         buf->Name[11] = 0xDE;
 698         buf->Name[12] = 0x96;
 699         buf->Name[13] = 0x8B;
 700         buf->Name[14] = 0xCD;
 701         buf->Name[15] = 0x7C;
 702         buf->Mode = cpu_to_le32(mode);
 703         cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
 704         return buf;
 705 }
 706
 707 static int
 708 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 709 {
 710         struct smb2_create_req *req = iov[0].iov_base;
 711         unsigned int num = *num_iovec;
 712
 713         iov[num].iov_base = create_posix_buf(mode);
 714         if (mode == ACL_NO_MODE)
 715                 cifs_dbg(FYI, "Invalid mode\n");
 716         if (iov[num].iov_base == NULL)
 717                 return -ENOMEM;
 718         iov[num].iov_len = sizeof(struct create_posix);
 719         if (!req->CreateContextsOffset)
 720                 req->CreateContextsOffset = cpu_to_le32(
 721                                 sizeof(struct smb2_create_req) +
 722                                 iov[num - 1].iov_len);
 723         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 724         *num_iovec = num + 1;
 725         return 0;
 726 }
 727
 728
 729 /*
 730  *
 731  *      SMB2 Worker functions follow:
 732  *
 733  *      The general structure of the worker functions is:
 734  *      1) Call smb2_init (assembles SMB2 header)
 735  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 736  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 737  *      4) Decode SMB2 command specific fields in the fixed length area
 738  *      5) Decode variable length data area (if any for this SMB2 command type)
 739  *      6) Call free smb buffer
 740  *      7) return
 741  *
 742  */
 743
 744 int
 745 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 746 {
 747         struct smb_rqst rqst;
 748         struct smb2_negotiate_req *req;
 749         struct smb2_negotiate_rsp *rsp;
 750         struct kvec iov[1];
 751         struct kvec rsp_iov;
 752         int rc = 0;
 753         int resp_buftype;
 754         struct TCP_Server_Info *server = cifs_ses_server(ses);
 755         int blob_offset, blob_length;
 756         char *security_blob;
 757         int flags = CIFS_NEG_OP;
 758         unsigned int total_len;
 759
 760         cifs_dbg(FYI, "Negotiate protocol\n");
 761
 762         if (!server) {
 763                 WARN(1, "%s: server is NULL!\n", __func__);
 764                 return -EIO;
 765         }
 766
 767         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
 768                                  (void **) &req, &total_len);
 769         if (rc)
 770                 return rc;
 771
 772         req->sync_hdr.SessionId = 0;
 773
 774         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 775         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 776
 777         if (strcmp(server->vals->version_string,
 778                    SMB3ANY_VERSION_STRING) == 0) {
 779                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 780                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 781                 req->DialectCount = cpu_to_le16(2);
 782                 total_len += 4;
 783         } else if (strcmp(server->vals->version_string,
 784                    SMBDEFAULT_VERSION_STRING) == 0) {
 785                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 786                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 787                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 788                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 789                 req->DialectCount = cpu_to_le16(4);
 790                 total_len += 8;
 791         } else {
 792                 /* otherwise send specific dialect */
 793                 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
 794                 req->DialectCount = cpu_to_le16(1);
 795                 total_len += 2;
 796         }
 797
 798         /* only one of SMB2 signing flags may be set in SMB2 request */
 799         if (ses->sign)
 800                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 801         else if (global_secflags & CIFSSEC_MAY_SIGN)
 802                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 803         else
 804                 req->SecurityMode = 0;
 805
 806         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
 807
 808         /* ClientGUID must be zero for SMB2.02 dialect */
 809         if (server->vals->protocol_id == SMB20_PROT_ID)
 810                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 811         else {
 812                 memcpy(req->ClientGUID, server->client_guid,
 813                         SMB2_CLIENT_GUID_SIZE);
 814                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
 815                     (strcmp(server->vals->version_string,
 816                      SMBDEFAULT_VERSION_STRING) == 0))
 817                         assemble_neg_contexts(req, server, &total_len);
 818         }
 819         iov[0].iov_base = (char *)req;
 820         iov[0].iov_len = total_len;
 821
 822         memset(&rqst, 0, sizeof(struct smb_rqst));
 823         rqst.rq_iov = iov;
 824         rqst.rq_nvec = 1;
 825
 826         rc = cifs_send_recv(xid, ses, server,
 827                             &rqst, &resp_buftype, flags, &rsp_iov);
 828         cifs_small_buf_release(req);
 829         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 830         /*
 831          * No tcon so can't do
 832          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 833          */
 834         if (rc == -EOPNOTSUPP) {
 835                 cifs_server_dbg(VFS, "Dialect not supported by server. Consider  specifying vers=1.0 or vers=2.0 on mount for accessing older servers\n");
 836                 goto neg_exit;
 837         } else if (rc != 0)
 838                 goto neg_exit;
 839
 840         if (strcmp(server->vals->version_string,
 841                    SMB3ANY_VERSION_STRING) == 0) {
 842                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 843                         cifs_server_dbg(VFS,
 844                                 "SMB2 dialect returned but not requested\n");
 845                         return -EIO;
 846                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 847                         cifs_server_dbg(VFS,
 848                                 "SMB2.1 dialect returned but not requested\n");
 849                         return -EIO;
 850                 }
 851         } else if (strcmp(server->vals->version_string,
 852                    SMBDEFAULT_VERSION_STRING) == 0) {
 853                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 854                         cifs_server_dbg(VFS,
 855                                 "SMB2 dialect returned but not requested\n");
 856                         return -EIO;
 857                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 858                         /* ops set to 3.0 by default for default so update */
 859                         server->ops = &smb21_operations;
 860                         server->vals = &smb21_values;
 861                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 862                         server->ops = &smb311_operations;
 863                         server->vals = &smb311_values;
 864                 }
 865         } else if (le16_to_cpu(rsp->DialectRevision) !=
 866                                 server->vals->protocol_id) {
 867                 /* if requested single dialect ensure returned dialect matched */
 868                 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
 869                                 le16_to_cpu(rsp->DialectRevision));
 870                 return -EIO;
 871         }
 872
 873         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 874
 875         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 876                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 877         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 878                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 879         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 880                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 881         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 882                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 883         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 884                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 885         else {
 886                 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
 887                                 le16_to_cpu(rsp->DialectRevision));
 888                 rc = -EIO;
 889                 goto neg_exit;
 890         }
 891         server->dialect = le16_to_cpu(rsp->DialectRevision);
 892
 893         /*
 894          * Keep a copy of the hash after negprot. This hash will be
 895          * the starting hash value for all sessions made from this
 896          * server.
 897          */
 898         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 899                SMB2_PREAUTH_HASH_SIZE);
 900
 901         /* SMB2 only has an extended negflavor */
 902         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 903         /* set it to the maximum buffer size value we can send with 1 credit */
 904         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 905                                SMB2_MAX_BUFFER_SIZE);
 906         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 907         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 908         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 909         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 910                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 911                                 server->sec_mode);
 912         server->capabilities = le32_to_cpu(rsp->Capabilities);
 913         /* Internal types */
 914         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 915
 916         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 917                                                (struct smb2_sync_hdr *)rsp);
 918         /*
 919          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 920          * for us will be
 921          *      ses->sectype = RawNTLMSSP;
 922          * but for time being this is our only auth choice so doesn't matter.
 923          * We just found a server which sets blob length to zero expecting raw.
 924          */
 925         if (blob_length == 0) {
 926                 cifs_dbg(FYI, "missing security blob on negprot\n");
 927                 server->sec_ntlmssp = true;
 928         }
 929
 930         rc = cifs_enable_signing(server, ses->sign);
 931         if (rc)
 932                 goto neg_exit;
 933         if (blob_length) {
 934                 rc = decode_negTokenInit(security_blob, blob_length, server);
 935                 if (rc == 1)
 936                         rc = 0;
 937                 else if (rc == 0)
 938                         rc = -EIO;
 939         }
 940
 941         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 942                 if (rsp->NegotiateContextCount)
 943                         rc = smb311_decode_neg_context(rsp, server,
 944                                                        rsp_iov.iov_len);
 945                 else
 946                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
 947         }
 948 neg_exit:
 949         free_rsp_buf(resp_buftype, rsp);
 950         return rc;
 951 }
 952
 953 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 954 {
 955         int rc;
 956         struct validate_negotiate_info_req *pneg_inbuf;
 957         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 958         u32 rsplen;
 959         u32 inbuflen; /* max of 4 dialects */
 960         struct TCP_Server_Info *server = tcon->ses->server;
 961
 962         cifs_dbg(FYI, "validate negotiate\n");
 963
 964         /* In SMB3.11 preauth integrity supersedes validate negotiate */
 965         if (server->dialect == SMB311_PROT_ID)
 966                 return 0;
 967
 968         /*
 969          * validation ioctl must be signed, so no point sending this if we
 970          * can not sign it (ie are not known user).  Even if signing is not
 971          * required (enabled but not negotiated), in those cases we selectively
 972          * sign just this, the first and only signed request on a connection.
 973          * Having validation of negotiate info  helps reduce attack vectors.
 974          */
 975         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
 976                 return 0; /* validation requires signing */
 977
 978         if (tcon->ses->user_name == NULL) {
 979                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
 980                 return 0; /* validation requires signing */
 981         }
 982
 983         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
 984                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
 985
 986         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
 987         if (!pneg_inbuf)
 988                 return -ENOMEM;
 989
 990         pneg_inbuf->Capabilities =
 991                         cpu_to_le32(server->vals->req_capabilities);
 992         memcpy(pneg_inbuf->Guid, server->client_guid,
 993                                         SMB2_CLIENT_GUID_SIZE);
 994
 995         if (tcon->ses->sign)
 996                 pneg_inbuf->SecurityMode =
 997                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 998         else if (global_secflags & CIFSSEC_MAY_SIGN)
 999                 pneg_inbuf->SecurityMode =
1000                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1001         else
1002                 pneg_inbuf->SecurityMode = 0;
1003
1004
1005         if (strcmp(server->vals->version_string,
1006                 SMB3ANY_VERSION_STRING) == 0) {
1007                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1008                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1009                 pneg_inbuf->DialectCount = cpu_to_le16(2);
1010                 /* structure is big enough for 3 dialects, sending only 2 */
1011                 inbuflen = sizeof(*pneg_inbuf) -
1012                                 (2 * sizeof(pneg_inbuf->Dialects[0]));
1013         } else if (strcmp(server->vals->version_string,
1014                 SMBDEFAULT_VERSION_STRING) == 0) {
1015                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1016                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1017                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1018                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1019                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1020                 /* structure is big enough for 3 dialects */
1021                 inbuflen = sizeof(*pneg_inbuf);
1022         } else {
1023                 /* otherwise specific dialect was requested */
1024                 pneg_inbuf->Dialects[0] =
1025                         cpu_to_le16(server->vals->protocol_id);
1026                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1027                 /* structure is big enough for 3 dialects, sending only 1 */
1028                 inbuflen = sizeof(*pneg_inbuf) -
1029                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
1030         }
1031
1032         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1033                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1034                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1035                 (char **)&pneg_rsp, &rsplen);
1036         if (rc == -EOPNOTSUPP) {
1037                 /*
1038                  * Old Windows versions or Netapp SMB server can return
1039                  * not supported error. Client should accept it.
1040                  */
1041                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1042                 rc = 0;
1043                 goto out_free_inbuf;
1044         } else if (rc != 0) {
1045                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1046                               rc);
1047                 rc = -EIO;
1048                 goto out_free_inbuf;
1049         }
1050
1051         rc = -EIO;
1052         if (rsplen != sizeof(*pneg_rsp)) {
1053                 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1054                               rsplen);
1055
1056                 /* relax check since Mac returns max bufsize allowed on ioctl */
1057                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1058                         goto out_free_rsp;
1059         }
1060
1061         /* check validate negotiate info response matches what we got earlier */
1062         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1063                 goto vneg_out;
1064
1065         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1066                 goto vneg_out;
1067
1068         /* do not validate server guid because not saved at negprot time yet */
1069
1070         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1071               SMB2_LARGE_FILES) != server->capabilities)
1072                 goto vneg_out;
1073
1074         /* validate negotiate successful */
1075         rc = 0;
1076         cifs_dbg(FYI, "validate negotiate info successful\n");
1077         goto out_free_rsp;
1078
1079 vneg_out:
1080         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1081 out_free_rsp:
1082         kfree(pneg_rsp);
1083 out_free_inbuf:
1084         kfree(pneg_inbuf);
1085         return rc;
1086 }
1087
1088 enum securityEnum
1089 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1090 {
1091         switch (requested) {
1092         case Kerberos:
1093         case RawNTLMSSP:
1094                 return requested;
1095         case NTLMv2:
1096                 return RawNTLMSSP;
1097         case Unspecified:
1098                 if (server->sec_ntlmssp &&
1099                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1100                         return RawNTLMSSP;
1101                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1102                         (global_secflags & CIFSSEC_MAY_KRB5))
1103                         return Kerberos;
1104                 fallthrough;
1105         default:
1106                 return Unspecified;
1107         }
1108 }
1109
1110 struct SMB2_sess_data {
1111         unsigned int xid;
1112         struct cifs_ses *ses;
1113         struct nls_table *nls_cp;
1114         void (*func)(struct SMB2_sess_data *);
1115         int result;
1116         u64 previous_session;
1117
1118         /* we will send the SMB in three pieces:
1119          * a fixed length beginning part, an optional
1120          * SPNEGO blob (which can be zero length), and a
1121          * last part which will include the strings
1122          * and rest of bcc area. This allows us to avoid
1123          * a large buffer 17K allocation
1124          */
1125         int buf0_type;
1126         struct kvec iov[2];
1127 };
1128
1129 static int
1130 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1131 {
1132         int rc;
1133         struct cifs_ses *ses = sess_data->ses;
1134         struct smb2_sess_setup_req *req;
1135         struct TCP_Server_Info *server = cifs_ses_server(ses);
1136         unsigned int total_len;
1137
1138         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1139                                  (void **) &req,
1140                                  &total_len);
1141         if (rc)
1142                 return rc;
1143
1144         if (sess_data->ses->binding) {
1145                 req->sync_hdr.SessionId = sess_data->ses->Suid;
1146                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1147                 req->PreviousSessionId = 0;
1148                 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1149         } else {
1150                 /* First session, not a reauthenticate */
1151                 req->sync_hdr.SessionId = 0;
1152                 /*
1153                  * if reconnect, we need to send previous sess id
1154                  * otherwise it is 0
1155                  */
1156                 req->PreviousSessionId = sess_data->previous_session;
1157                 req->Flags = 0; /* MBZ */
1158         }
1159
1160         /* enough to enable echos and oplocks and one max size write */
1161         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1162
1163         /* only one of SMB2 signing flags may be set in SMB2 request */
1164         if (server->sign)
1165                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1166         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1167                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1168         else
1169                 req->SecurityMode = 0;
1170
1171 #ifdef CONFIG_CIFS_DFS_UPCALL
1172         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1173 #else
1174         req->Capabilities = 0;
1175 #endif /* DFS_UPCALL */
1176
1177         req->Channel = 0; /* MBZ */
1178
1179         sess_data->iov[0].iov_base = (char *)req;
1180         /* 1 for pad */
1181         sess_data->iov[0].iov_len = total_len - 1;
1182         /*
1183          * This variable will be used to clear the buffer
1184          * allocated above in case of any error in the calling function.
1185          */
1186         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1187
1188         return 0;
1189 }
1190
1191 static void
1192 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1193 {
1194         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1195         sess_data->buf0_type = CIFS_NO_BUFFER;
1196 }
1197
1198 static int
1199 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1200 {
1201         int rc;
1202         struct smb_rqst rqst;
1203         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1204         struct kvec rsp_iov = { NULL, 0 };
1205
1206         /* Testing shows that buffer offset must be at location of Buffer[0] */
1207         req->SecurityBufferOffset =
1208                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1209         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1210
1211         memset(&rqst, 0, sizeof(struct smb_rqst));
1212         rqst.rq_iov = sess_data->iov;
1213         rqst.rq_nvec = 2;
1214
1215         /* BB add code to build os and lm fields */
1216         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1217                             cifs_ses_server(sess_data->ses),
1218                             &rqst,
1219                             &sess_data->buf0_type,
1220                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1221         cifs_small_buf_release(sess_data->iov[0].iov_base);
1222         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1223
1224         return rc;
1225 }
1226
1227 static int
1228 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1229 {
1230         int rc = 0;
1231         struct cifs_ses *ses = sess_data->ses;
1232         struct TCP_Server_Info *server = cifs_ses_server(ses);
1233
1234         mutex_lock(&server->srv_mutex);
1235         if (server->ops->generate_signingkey) {
1236                 rc = server->ops->generate_signingkey(ses);
1237                 if (rc) {
1238                         cifs_dbg(FYI,
1239                                 "SMB3 session key generation failed\n");
1240                         mutex_unlock(&server->srv_mutex);
1241                         return rc;
1242                 }
1243         }
1244         if (!server->session_estab) {
1245                 server->sequence_number = 0x2;
1246                 server->session_estab = true;
1247         }
1248         mutex_unlock(&server->srv_mutex);
1249
1250         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1251         /* keep existing ses state if binding */
1252         if (!ses->binding) {
1253                 spin_lock(&GlobalMid_Lock);
1254                 ses->status = CifsGood;
1255                 ses->need_reconnect = false;
1256                 spin_unlock(&GlobalMid_Lock);
1257         }
1258
1259         return rc;
1260 }
1261
1262 #ifdef CONFIG_CIFS_UPCALL
1263 static void
1264 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1265 {
1266         int rc;
1267         struct cifs_ses *ses = sess_data->ses;
1268         struct cifs_spnego_msg *msg;
1269         struct key *spnego_key = NULL;
1270         struct smb2_sess_setup_rsp *rsp = NULL;
1271
1272         rc = SMB2_sess_alloc_buffer(sess_data);
1273         if (rc)
1274                 goto out;
1275
1276         spnego_key = cifs_get_spnego_key(ses);
1277         if (IS_ERR(spnego_key)) {
1278                 rc = PTR_ERR(spnego_key);
1279                 if (rc == -ENOKEY)
1280                         cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1281                 spnego_key = NULL;
1282                 goto out;
1283         }
1284
1285         msg = spnego_key->payload.data[0];
1286         /*
1287          * check version field to make sure that cifs.upcall is
1288          * sending us a response in an expected form
1289          */
1290         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1291                 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1292                          CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1293                 rc = -EKEYREJECTED;
1294                 goto out_put_spnego_key;
1295         }
1296
1297         /* keep session key if binding */
1298         if (!ses->binding) {
1299                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1300                                                  GFP_KERNEL);
1301                 if (!ses->auth_key.response) {
1302                         cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1303                                  msg->sesskey_len);
1304                         rc = -ENOMEM;
1305                         goto out_put_spnego_key;
1306                 }
1307                 ses->auth_key.len = msg->sesskey_len;
1308         }
1309
1310         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1311         sess_data->iov[1].iov_len = msg->secblob_len;
1312
1313         rc = SMB2_sess_sendreceive(sess_data);
1314         if (rc)
1315                 goto out_put_spnego_key;
1316
1317         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1318         /* keep session id and flags if binding */
1319         if (!ses->binding) {
1320                 ses->Suid = rsp->sync_hdr.SessionId;
1321                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1322         }
1323
1324         rc = SMB2_sess_establish_session(sess_data);
1325 out_put_spnego_key:
1326         key_invalidate(spnego_key);
1327         key_put(spnego_key);
1328 out:
1329         sess_data->result = rc;
1330         sess_data->func = NULL;
1331         SMB2_sess_free_buffer(sess_data);
1332 }
1333 #else
1334 static void
1335 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1336 {
1337         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1338         sess_data->result = -EOPNOTSUPP;
1339         sess_data->func = NULL;
1340 }
1341 #endif
1342
1343 static void
1344 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1345
1346 static void
1347 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1348 {
1349         int rc;
1350         struct cifs_ses *ses = sess_data->ses;
1351         struct smb2_sess_setup_rsp *rsp = NULL;
1352         char *ntlmssp_blob = NULL;
1353         bool use_spnego = false; /* else use raw ntlmssp */
1354         u16 blob_length = 0;
1355
1356         /*
1357          * If memory allocation is successful, caller of this function
1358          * frees it.
1359          */
1360         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1361         if (!ses->ntlmssp) {
1362                 rc = -ENOMEM;
1363                 goto out_err;
1364         }
1365         ses->ntlmssp->sesskey_per_smbsess = true;
1366
1367         rc = SMB2_sess_alloc_buffer(sess_data);
1368         if (rc)
1369                 goto out_err;
1370
1371         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1372                                GFP_KERNEL);
1373         if (ntlmssp_blob == NULL) {
1374                 rc = -ENOMEM;
1375                 goto out;
1376         }
1377
1378         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1379         if (use_spnego) {
1380                 /* BB eventually need to add this */
1381                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1382                 rc = -EOPNOTSUPP;
1383                 goto out;
1384         } else {
1385                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1386                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1387         }
1388         sess_data->iov[1].iov_base = ntlmssp_blob;
1389         sess_data->iov[1].iov_len = blob_length;
1390
1391         rc = SMB2_sess_sendreceive(sess_data);
1392         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1393
1394         /* If true, rc here is expected and not an error */
1395         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1396                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1397                 rc = 0;
1398
1399         if (rc)
1400                 goto out;
1401
1402         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1403                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1404                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1405                         le16_to_cpu(rsp->SecurityBufferOffset));
1406                 rc = -EIO;
1407                 goto out;
1408         }
1409         rc = decode_ntlmssp_challenge(rsp->Buffer,
1410                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1411         if (rc)
1412                 goto out;
1413
1414         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1415
1416         /* keep existing ses id and flags if binding */
1417         if (!ses->binding) {
1418                 ses->Suid = rsp->sync_hdr.SessionId;
1419                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1420         }
1421
1422 out:
1423         kfree(ntlmssp_blob);
1424         SMB2_sess_free_buffer(sess_data);
1425         if (!rc) {
1426                 sess_data->result = 0;
1427                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1428                 return;
1429         }
1430 out_err:
1431         kfree(ses->ntlmssp);
1432         ses->ntlmssp = NULL;
1433         sess_data->result = rc;
1434         sess_data->func = NULL;
1435 }
1436
1437 static void
1438 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1439 {
1440         int rc;
1441         struct cifs_ses *ses = sess_data->ses;
1442         struct smb2_sess_setup_req *req;
1443         struct smb2_sess_setup_rsp *rsp = NULL;
1444         unsigned char *ntlmssp_blob = NULL;
1445         bool use_spnego = false; /* else use raw ntlmssp */
1446         u16 blob_length = 0;
1447
1448         rc = SMB2_sess_alloc_buffer(sess_data);
1449         if (rc)
1450                 goto out;
1451
1452         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1453         req->sync_hdr.SessionId = ses->Suid;
1454
1455         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1456                                         sess_data->nls_cp);
1457         if (rc) {
1458                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1459                 goto out;
1460         }
1461
1462         if (use_spnego) {
1463                 /* BB eventually need to add this */
1464                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1465                 rc = -EOPNOTSUPP;
1466                 goto out;
1467         }
1468         sess_data->iov[1].iov_base = ntlmssp_blob;
1469         sess_data->iov[1].iov_len = blob_length;
1470
1471         rc = SMB2_sess_sendreceive(sess_data);
1472         if (rc)
1473                 goto out;
1474
1475         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1476
1477         /* keep existing ses id and flags if binding */
1478         if (!ses->binding) {
1479                 ses->Suid = rsp->sync_hdr.SessionId;
1480                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1481         }
1482
1483         rc = SMB2_sess_establish_session(sess_data);
1484 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1485         if (ses->server->dialect < SMB30_PROT_ID) {
1486                 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1487                 /*
1488                  * The session id is opaque in terms of endianness, so we can't
1489                  * print it as a long long. we dump it as we got it on the wire
1490                  */
1491                 cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1492                          &ses->Suid);
1493                 cifs_dbg(VFS, "Session Key   %*ph\n",
1494                          SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1495                 cifs_dbg(VFS, "Signing Key   %*ph\n",
1496                          SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1497         }
1498 #endif
1499 out:
1500         kfree(ntlmssp_blob);
1501         SMB2_sess_free_buffer(sess_data);
1502         kfree(ses->ntlmssp);
1503         ses->ntlmssp = NULL;
1504         sess_data->result = rc;
1505         sess_data->func = NULL;
1506 }
1507
1508 static int
1509 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1510 {
1511         int type;
1512
1513         type = smb2_select_sectype(cifs_ses_server(ses), ses->sectype);
1514         cifs_dbg(FYI, "sess setup type %d\n", type);
1515         if (type == Unspecified) {
1516                 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1517                 return -EINVAL;
1518         }
1519
1520         switch (type) {
1521         case Kerberos:
1522                 sess_data->func = SMB2_auth_kerberos;
1523                 break;
1524         case RawNTLMSSP:
1525                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1526                 break;
1527         default:
1528                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1529                 return -EOPNOTSUPP;
1530         }
1531
1532         return 0;
1533 }
1534
1535 int
1536 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1537                 const struct nls_table *nls_cp)
1538 {
1539         int rc = 0;
1540         struct TCP_Server_Info *server = cifs_ses_server(ses);
1541         struct SMB2_sess_data *sess_data;
1542
1543         cifs_dbg(FYI, "Session Setup\n");
1544
1545         if (!server) {
1546                 WARN(1, "%s: server is NULL!\n", __func__);
1547                 return -EIO;
1548         }
1549
1550         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1551         if (!sess_data)
1552                 return -ENOMEM;
1553
1554         rc = SMB2_select_sec(ses, sess_data);
1555         if (rc)
1556                 goto out;
1557         sess_data->xid = xid;
1558         sess_data->ses = ses;
1559         sess_data->buf0_type = CIFS_NO_BUFFER;
1560         sess_data->nls_cp = (struct nls_table *) nls_cp;
1561         sess_data->previous_session = ses->Suid;
1562
1563         /*
1564          * Initialize the session hash with the server one.
1565          */
1566         memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1567                SMB2_PREAUTH_HASH_SIZE);
1568
1569         while (sess_data->func)
1570                 sess_data->func(sess_data);
1571
1572         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1573                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1574         rc = sess_data->result;
1575 out:
1576         kfree(sess_data);
1577         return rc;
1578 }
1579
1580 int
1581 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1582 {
1583         struct smb_rqst rqst;
1584         struct smb2_logoff_req *req; /* response is also trivial struct */
1585         int rc = 0;
1586         struct TCP_Server_Info *server;
1587         int flags = 0;
1588         unsigned int total_len;
1589         struct kvec iov[1];
1590         struct kvec rsp_iov;
1591         int resp_buf_type;
1592
1593         cifs_dbg(FYI, "disconnect session %p\n", ses);
1594
1595         if (ses && (ses->server))
1596                 server = ses->server;
1597         else
1598                 return -EIO;
1599
1600         /* no need to send SMB logoff if uid already closed due to reconnect */
1601         if (ses->need_reconnect)
1602                 goto smb2_session_already_dead;
1603
1604         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1605                                  (void **) &req, &total_len);
1606         if (rc)
1607                 return rc;
1608
1609          /* since no tcon, smb2_init can not do this, so do here */
1610         req->sync_hdr.SessionId = ses->Suid;
1611
1612         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1613                 flags |= CIFS_TRANSFORM_REQ;
1614         else if (server->sign)
1615                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1616
1617         flags |= CIFS_NO_RSP_BUF;
1618
1619         iov[0].iov_base = (char *)req;
1620         iov[0].iov_len = total_len;
1621
1622         memset(&rqst, 0, sizeof(struct smb_rqst));
1623         rqst.rq_iov = iov;
1624         rqst.rq_nvec = 1;
1625
1626         rc = cifs_send_recv(xid, ses, ses->server,
1627                             &rqst, &resp_buf_type, flags, &rsp_iov);
1628         cifs_small_buf_release(req);
1629         /*
1630          * No tcon so can't do
1631          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1632          */
1633
1634 smb2_session_already_dead:
1635         return rc;
1636 }
1637
1638 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1639 {
1640         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1641 }
1642
1643 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1644
1645 /* These are similar values to what Windows uses */
1646 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1647 {
1648         tcon->max_chunks = 256;
1649         tcon->max_bytes_chunk = 1048576;
1650         tcon->max_bytes_copy = 16777216;
1651 }
1652
1653 int
1654 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1655           struct cifs_tcon *tcon, const struct nls_table *cp)
1656 {
1657         struct smb_rqst rqst;
1658         struct smb2_tree_connect_req *req;
1659         struct smb2_tree_connect_rsp *rsp = NULL;
1660         struct kvec iov[2];
1661         struct kvec rsp_iov = { NULL, 0 };
1662         int rc = 0;
1663         int resp_buftype;
1664         int unc_path_len;
1665         __le16 *unc_path = NULL;
1666         int flags = 0;
1667         unsigned int total_len;
1668         struct TCP_Server_Info *server;
1669
1670         /* always use master channel */
1671         server = ses->server;
1672
1673         cifs_dbg(FYI, "TCON\n");
1674
1675         if (!server || !tree)
1676                 return -EIO;
1677
1678         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1679         if (unc_path == NULL)
1680                 return -ENOMEM;
1681
1682         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1683         unc_path_len *= 2;
1684         if (unc_path_len < 2) {
1685                 kfree(unc_path);
1686                 return -EINVAL;
1687         }
1688
1689         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1690         tcon->tid = 0;
1691         atomic_set(&tcon->num_remote_opens, 0);
1692         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
1693                                  (void **) &req, &total_len);
1694         if (rc) {
1695                 kfree(unc_path);
1696                 return rc;
1697         }
1698
1699         if (smb3_encryption_required(tcon))
1700                 flags |= CIFS_TRANSFORM_REQ;
1701
1702         iov[0].iov_base = (char *)req;
1703         /* 1 for pad */
1704         iov[0].iov_len = total_len - 1;
1705
1706         /* Testing shows that buffer offset must be at location of Buffer[0] */
1707         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1708                         - 1 /* pad */);
1709         req->PathLength = cpu_to_le16(unc_path_len - 2);
1710         iov[1].iov_base = unc_path;
1711         iov[1].iov_len = unc_path_len;
1712
1713         /*
1714          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1715          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1716          * (Samba servers don't always set the flag so also check if null user)
1717          */
1718         if ((server->dialect == SMB311_PROT_ID) &&
1719             !smb3_encryption_required(tcon) &&
1720             !(ses->session_flags &
1721                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1722             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1723                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1724
1725         memset(&rqst, 0, sizeof(struct smb_rqst));
1726         rqst.rq_iov = iov;
1727         rqst.rq_nvec = 2;
1728
1729         /* Need 64 for max size write so ask for more in case not there yet */
1730         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1731
1732         rc = cifs_send_recv(xid, ses, server,
1733                             &rqst, &resp_buftype, flags, &rsp_iov);
1734         cifs_small_buf_release(req);
1735         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1736         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1737         if (rc != 0) {
1738                 if (tcon) {
1739                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1740                         tcon->need_reconnect = true;
1741                 }
1742                 goto tcon_error_exit;
1743         }
1744
1745         switch (rsp->ShareType) {
1746         case SMB2_SHARE_TYPE_DISK:
1747                 cifs_dbg(FYI, "connection to disk share\n");
1748                 break;
1749         case SMB2_SHARE_TYPE_PIPE:
1750                 tcon->pipe = true;
1751                 cifs_dbg(FYI, "connection to pipe share\n");
1752                 break;
1753         case SMB2_SHARE_TYPE_PRINT:
1754                 tcon->print = true;
1755                 cifs_dbg(FYI, "connection to printer\n");
1756                 break;
1757         default:
1758                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1759                 rc = -EOPNOTSUPP;
1760                 goto tcon_error_exit;
1761         }
1762
1763         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1764         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1765         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1766         tcon->tidStatus = CifsGood;
1767         tcon->need_reconnect = false;
1768         tcon->tid = rsp->sync_hdr.TreeId;
1769         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1770
1771         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1772             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1773                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1774
1775         if (tcon->seal &&
1776             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1777                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1778
1779         init_copy_chunk_defaults(tcon);
1780         if (server->ops->validate_negotiate)
1781                 rc = server->ops->validate_negotiate(xid, tcon);
1782 tcon_exit:
1783
1784         free_rsp_buf(resp_buftype, rsp);
1785         kfree(unc_path);
1786         return rc;
1787
1788 tcon_error_exit:
1789         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1790                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1791         }
1792         goto tcon_exit;
1793 }
1794
1795 int
1796 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1797 {
1798         struct smb_rqst rqst;
1799         struct smb2_tree_disconnect_req *req; /* response is trivial */
1800         int rc = 0;
1801         struct cifs_ses *ses = tcon->ses;
1802         int flags = 0;
1803         unsigned int total_len;
1804         struct kvec iov[1];
1805         struct kvec rsp_iov;
1806         int resp_buf_type;
1807
1808         cifs_dbg(FYI, "Tree Disconnect\n");
1809
1810         if (!ses || !(ses->server))
1811                 return -EIO;
1812
1813         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1814                 return 0;
1815
1816         close_shroot_lease(&tcon->crfid);
1817
1818         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
1819                                  (void **) &req,
1820                                  &total_len);
1821         if (rc)
1822                 return rc;
1823
1824         if (smb3_encryption_required(tcon))
1825                 flags |= CIFS_TRANSFORM_REQ;
1826
1827         flags |= CIFS_NO_RSP_BUF;
1828
1829         iov[0].iov_base = (char *)req;
1830         iov[0].iov_len = total_len;
1831
1832         memset(&rqst, 0, sizeof(struct smb_rqst));
1833         rqst.rq_iov = iov;
1834         rqst.rq_nvec = 1;
1835
1836         rc = cifs_send_recv(xid, ses, ses->server,
1837                             &rqst, &resp_buf_type, flags, &rsp_iov);
1838         cifs_small_buf_release(req);
1839         if (rc)
1840                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1841
1842         return rc;
1843 }
1844
1845
1846 static struct create_durable *
1847 create_durable_buf(void)
1848 {
1849         struct create_durable *buf;
1850
1851         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1852         if (!buf)
1853                 return NULL;
1854
1855         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1856                                         (struct create_durable, Data));
1857         buf->ccontext.DataLength = cpu_to_le32(16);
1858         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1859                                 (struct create_durable, Name));
1860         buf->ccontext.NameLength = cpu_to_le16(4);
1861         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1862         buf->Name[0] = 'D';
1863         buf->Name[1] = 'H';
1864         buf->Name[2] = 'n';
1865         buf->Name[3] = 'Q';
1866         return buf;
1867 }
1868
1869 static struct create_durable *
1870 create_reconnect_durable_buf(struct cifs_fid *fid)
1871 {
1872         struct create_durable *buf;
1873
1874         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1875         if (!buf)
1876                 return NULL;
1877
1878         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1879                                         (struct create_durable, Data));
1880         buf->ccontext.DataLength = cpu_to_le32(16);
1881         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1882                                 (struct create_durable, Name));
1883         buf->ccontext.NameLength = cpu_to_le16(4);
1884         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1885         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1886         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1887         buf->Name[0] = 'D';
1888         buf->Name[1] = 'H';
1889         buf->Name[2] = 'n';
1890         buf->Name[3] = 'C';
1891         return buf;
1892 }
1893
1894 static void
1895 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
1896 {
1897         struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
1898
1899         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
1900                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
1901         buf->IndexNumber = pdisk_id->DiskFileId;
1902 }
1903
1904 static void
1905 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
1906                  struct create_posix_rsp *posix)
1907 {
1908         int sid_len;
1909         u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
1910         u8 *end = beg + le32_to_cpu(cc->DataLength);
1911         u8 *sid;
1912
1913         memset(posix, 0, sizeof(*posix));
1914
1915         posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
1916         posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
1917         posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
1918
1919         sid = beg + 12;
1920         sid_len = posix_info_sid_size(sid, end);
1921         if (sid_len < 0) {
1922                 cifs_dbg(VFS, "bad owner sid in posix create response\n");
1923                 return;
1924         }
1925         memcpy(&posix->owner, sid, sid_len);
1926
1927         sid = sid + sid_len;
1928         sid_len = posix_info_sid_size(sid, end);
1929         if (sid_len < 0) {
1930                 cifs_dbg(VFS, "bad group sid in posix create response\n");
1931                 return;
1932         }
1933         memcpy(&posix->group, sid, sid_len);
1934
1935         cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
1936                  posix->nlink, posix->mode, posix->reparse_tag);
1937 }
1938
1939 void
1940 smb2_parse_contexts(struct TCP_Server_Info *server,
1941                     struct smb2_create_rsp *rsp,
1942                     unsigned int *epoch, char *lease_key, __u8 *oplock,
1943                     struct smb2_file_all_info *buf,
1944                     struct create_posix_rsp *posix)
1945 {
1946         char *data_offset;
1947         struct create_context *cc;
1948         unsigned int next;
1949         unsigned int remaining;
1950         char *name;
1951         const char smb3_create_tag_posix[] = {0x93, 0xAD, 0x25, 0x50, 0x9C,
1952                                         0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
1953                                         0xDE, 0x96, 0x8B, 0xCD, 0x7C};
1954
1955         *oplock = 0;
1956         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1957         remaining = le32_to_cpu(rsp->CreateContextsLength);
1958         cc = (struct create_context *)data_offset;
1959
1960         /* Initialize inode number to 0 in case no valid data in qfid context */
1961         if (buf)
1962                 buf->IndexNumber = 0;
1963
1964         while (remaining >= sizeof(struct create_context)) {
1965                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1966                 if (le16_to_cpu(cc->NameLength) == 4 &&
1967                     strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
1968                         *oplock = server->ops->parse_lease_buf(cc, epoch,
1969                                                            lease_key);
1970                 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
1971                     strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
1972                         parse_query_id_ctxt(cc, buf);
1973                 else if ((le16_to_cpu(cc->NameLength) == 16)) {
1974                         if (posix &&
1975                             memcmp(name, smb3_create_tag_posix, 16) == 0)
1976                                 parse_posix_ctxt(cc, buf, posix);
1977                 }
1978                 /* else {
1979                         cifs_dbg(FYI, "Context not matched with len %d\n",
1980                                 le16_to_cpu(cc->NameLength));
1981                         cifs_dump_mem("Cctxt name: ", name, 4);
1982                 } */
1983
1984                 next = le32_to_cpu(cc->Next);
1985                 if (!next)
1986                         break;
1987                 remaining -= next;
1988                 cc = (struct create_context *)((char *)cc + next);
1989         }
1990
1991         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
1992                 *oplock = rsp->OplockLevel;
1993
1994         return;
1995 }
1996
1997 static int
1998 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1999                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2000 {
2001         struct smb2_create_req *req = iov[0].iov_base;
2002         unsigned int num = *num_iovec;
2003
2004         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2005         if (iov[num].iov_base == NULL)
2006                 return -ENOMEM;
2007         iov[num].iov_len = server->vals->create_lease_size;
2008         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2009         if (!req->CreateContextsOffset)
2010                 req->CreateContextsOffset = cpu_to_le32(
2011                                 sizeof(struct smb2_create_req) +
2012                                 iov[num - 1].iov_len);
2013         le32_add_cpu(&req->CreateContextsLength,
2014                      server->vals->create_lease_size);
2015         *num_iovec = num + 1;
2016         return 0;
2017 }
2018
2019 static struct create_durable_v2 *
2020 create_durable_v2_buf(struct cifs_open_parms *oparms)
2021 {
2022         struct cifs_fid *pfid = oparms->fid;
2023         struct create_durable_v2 *buf;
2024
2025         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2026         if (!buf)
2027                 return NULL;
2028
2029         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2030                                         (struct create_durable_v2, dcontext));
2031         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2032         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2033                                 (struct create_durable_v2, Name));
2034         buf->ccontext.NameLength = cpu_to_le16(4);
2035
2036         /*
2037          * NB: Handle timeout defaults to 0, which allows server to choose
2038          * (most servers default to 120 seconds) and most clients default to 0.
2039          * This can be overridden at mount ("handletimeout=") if the user wants
2040          * a different persistent (or resilient) handle timeout for all opens
2041          * opens on a particular SMB3 mount.
2042          */
2043         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2044         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2045         generate_random_uuid(buf->dcontext.CreateGuid);
2046         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2047
2048         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2049         buf->Name[0] = 'D';
2050         buf->Name[1] = 'H';
2051         buf->Name[2] = '2';
2052         buf->Name[3] = 'Q';
2053         return buf;
2054 }
2055
2056 static struct create_durable_handle_reconnect_v2 *
2057 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2058 {
2059         struct create_durable_handle_reconnect_v2 *buf;
2060
2061         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2062                         GFP_KERNEL);
2063         if (!buf)
2064                 return NULL;
2065
2066         buf->ccontext.DataOffset =
2067                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2068                                      dcontext));
2069         buf->ccontext.DataLength =
2070                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2071         buf->ccontext.NameOffset =
2072                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2073                             Name));
2074         buf->ccontext.NameLength = cpu_to_le16(4);
2075
2076         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2077         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2078         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2079         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2080
2081         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2082         buf->Name[0] = 'D';
2083         buf->Name[1] = 'H';
2084         buf->Name[2] = '2';
2085         buf->Name[3] = 'C';
2086         return buf;
2087 }
2088
2089 static int
2090 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2091                     struct cifs_open_parms *oparms)
2092 {
2093         struct smb2_create_req *req = iov[0].iov_base;
2094         unsigned int num = *num_iovec;
2095
2096         iov[num].iov_base = create_durable_v2_buf(oparms);
2097         if (iov[num].iov_base == NULL)
2098                 return -ENOMEM;
2099         iov[num].iov_len = sizeof(struct create_durable_v2);
2100         if (!req->CreateContextsOffset)
2101                 req->CreateContextsOffset =
2102                         cpu_to_le32(sizeof(struct smb2_create_req) +
2103                                                                 iov[1].iov_len);
2104         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2105         *num_iovec = num + 1;
2106         return 0;
2107 }
2108
2109 static int
2110 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2111                     struct cifs_open_parms *oparms)
2112 {
2113         struct smb2_create_req *req = iov[0].iov_base;
2114         unsigned int num = *num_iovec;
2115
2116         /* indicate that we don't need to relock the file */
2117         oparms->reconnect = false;
2118
2119         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2120         if (iov[num].iov_base == NULL)
2121                 return -ENOMEM;
2122         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2123         if (!req->CreateContextsOffset)
2124                 req->CreateContextsOffset =
2125                         cpu_to_le32(sizeof(struct smb2_create_req) +
2126                                                                 iov[1].iov_len);
2127         le32_add_cpu(&req->CreateContextsLength,
2128                         sizeof(struct create_durable_handle_reconnect_v2));
2129         *num_iovec = num + 1;
2130         return 0;
2131 }
2132
2133 static int
2134 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2135                     struct cifs_open_parms *oparms, bool use_persistent)
2136 {
2137         struct smb2_create_req *req = iov[0].iov_base;
2138         unsigned int num = *num_iovec;
2139
2140         if (use_persistent) {
2141                 if (oparms->reconnect)
2142                         return add_durable_reconnect_v2_context(iov, num_iovec,
2143                                                                 oparms);
2144                 else
2145                         return add_durable_v2_context(iov, num_iovec, oparms);
2146         }
2147
2148         if (oparms->reconnect) {
2149                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2150                 /* indicate that we don't need to relock the file */
2151                 oparms->reconnect = false;
2152         } else
2153                 iov[num].iov_base = create_durable_buf();
2154         if (iov[num].iov_base == NULL)
2155                 return -ENOMEM;
2156         iov[num].iov_len = sizeof(struct create_durable);
2157         if (!req->CreateContextsOffset)
2158                 req->CreateContextsOffset =
2159                         cpu_to_le32(sizeof(struct smb2_create_req) +
2160                                                                 iov[1].iov_len);
2161         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2162         *num_iovec = num + 1;
2163         return 0;
2164 }
2165
2166 /* See MS-SMB2 2.2.13.2.7 */
2167 static struct crt_twarp_ctxt *
2168 create_twarp_buf(__u64 timewarp)
2169 {
2170         struct crt_twarp_ctxt *buf;
2171
2172         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2173         if (!buf)
2174                 return NULL;
2175
2176         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2177                                         (struct crt_twarp_ctxt, Timestamp));
2178         buf->ccontext.DataLength = cpu_to_le32(8);
2179         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2180                                 (struct crt_twarp_ctxt, Name));
2181         buf->ccontext.NameLength = cpu_to_le16(4);
2182         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2183         buf->Name[0] = 'T';
2184         buf->Name[1] = 'W';
2185         buf->Name[2] = 'r';
2186         buf->Name[3] = 'p';
2187         buf->Timestamp = cpu_to_le64(timewarp);
2188         return buf;
2189 }
2190
2191 /* See MS-SMB2 2.2.13.2.7 */
2192 static int
2193 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2194 {
2195         struct smb2_create_req *req = iov[0].iov_base;
2196         unsigned int num = *num_iovec;
2197
2198         iov[num].iov_base = create_twarp_buf(timewarp);
2199         if (iov[num].iov_base == NULL)
2200                 return -ENOMEM;
2201         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2202         if (!req->CreateContextsOffset)
2203                 req->CreateContextsOffset = cpu_to_le32(
2204                                 sizeof(struct smb2_create_req) +
2205                                 iov[num - 1].iov_len);
2206         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2207         *num_iovec = num + 1;
2208         return 0;
2209 }
2210
2211 /* See See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2212 static void setup_owner_group_sids(char *buf)
2213 {
2214         struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2215
2216         /* Populate the user ownership fields S-1-5-88-1 */
2217         sids->owner.Revision = 1;
2218         sids->owner.NumAuth = 3;
2219         sids->owner.Authority[5] = 5;
2220         sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2221         sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2222         sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2223
2224         /* Populate the group ownership fields S-1-5-88-2 */
2225         sids->group.Revision = 1;
2226         sids->group.NumAuth = 3;
2227         sids->group.Authority[5] = 5;
2228         sids->group.SubAuthorities[0] = cpu_to_le32(88);
2229         sids->group.SubAuthorities[1] = cpu_to_le32(2);
2230         sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2231
2232         cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2233 }
2234
2235 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2236 static struct crt_sd_ctxt *
2237 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2238 {
2239         struct crt_sd_ctxt *buf;
2240         struct cifs_ace *pace;
2241         unsigned int sdlen, acelen;
2242         unsigned int owner_offset = 0;
2243         unsigned int group_offset = 0;
2244
2245         *len = roundup(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 2), 8);
2246
2247         if (set_owner) {
2248                 /* offset fields are from beginning of security descriptor not of create context */
2249                 owner_offset = sizeof(struct smb3_acl) + (sizeof(struct cifs_ace) * 2);
2250
2251                 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2252                 *len += sizeof(struct owner_group_sids);
2253         }
2254
2255         buf = kzalloc(*len, GFP_KERNEL);
2256         if (buf == NULL)
2257                 return buf;
2258
2259         if (set_owner) {
2260                 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2261                 group_offset = owner_offset + sizeof(struct owner_sid);
2262                 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2263         } else {
2264                 buf->sd.OffsetOwner = 0;
2265                 buf->sd.OffsetGroup = 0;
2266         }
2267
2268         sdlen = sizeof(struct smb3_sd) + sizeof(struct smb3_acl) +
2269                  2 * sizeof(struct cifs_ace);
2270         if (set_owner) {
2271                 sdlen += sizeof(struct owner_group_sids);
2272                 setup_owner_group_sids(owner_offset + sizeof(struct create_context) + 8 /* name */
2273                         + (char *)buf);
2274         }
2275
2276         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2277                                         (struct crt_sd_ctxt, sd));
2278         buf->ccontext.DataLength = cpu_to_le32(sdlen);
2279         buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2280         buf->ccontext.NameLength = cpu_to_le16(4);
2281         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2282         buf->Name[0] = 'S';
2283         buf->Name[1] = 'e';
2284         buf->Name[2] = 'c';
2285         buf->Name[3] = 'D';
2286         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2287         /*
2288          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2289          * and "DP" ie the DACL is present
2290          */
2291         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2292
2293         /* offset owner, group and Sbz1 and SACL are all zero */
2294         buf->sd.OffsetDacl = cpu_to_le32(sizeof(struct smb3_sd));
2295         buf->acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2296
2297         /* create one ACE to hold the mode embedded in reserved special SID */
2298         pace = (struct cifs_ace *)(sizeof(struct crt_sd_ctxt) + (char *)buf);
2299         acelen = setup_special_mode_ACE(pace, (__u64)mode);
2300
2301         if (set_owner) {
2302                 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2303                 pace = (struct cifs_ace *)(acelen + (sizeof(struct crt_sd_ctxt) + (char *)buf));
2304                 acelen += setup_special_user_owner_ACE(pace);
2305                 /* it does not appear necessary to add an ACE for the NFS group SID */
2306                 buf->acl.AceCount = cpu_to_le16(3);
2307         } else
2308                 buf->acl.AceCount = cpu_to_le16(2);
2309
2310         /* and one more ACE to allow access for authenticated users */
2311         pace = (struct cifs_ace *)(acelen + (sizeof(struct crt_sd_ctxt) +
2312                 (char *)buf));
2313         acelen += setup_authusers_ACE(pace);
2314
2315         buf->acl.AclSize = cpu_to_le16(sizeof(struct cifs_acl) + acelen);
2316
2317         return buf;
2318 }
2319
2320 static int
2321 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2322 {
2323         struct smb2_create_req *req = iov[0].iov_base;
2324         unsigned int num = *num_iovec;
2325         unsigned int len = 0;
2326
2327         iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2328         if (iov[num].iov_base == NULL)
2329                 return -ENOMEM;
2330         iov[num].iov_len = len;
2331         if (!req->CreateContextsOffset)
2332                 req->CreateContextsOffset = cpu_to_le32(
2333                                 sizeof(struct smb2_create_req) +
2334                                 iov[num - 1].iov_len);
2335         le32_add_cpu(&req->CreateContextsLength, len);
2336         *num_iovec = num + 1;
2337         return 0;
2338 }
2339
2340 static struct crt_query_id_ctxt *
2341 create_query_id_buf(void)
2342 {
2343         struct crt_query_id_ctxt *buf;
2344
2345         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2346         if (!buf)
2347                 return NULL;
2348
2349         buf->ccontext.DataOffset = cpu_to_le16(0);
2350         buf->ccontext.DataLength = cpu_to_le32(0);
2351         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2352                                 (struct crt_query_id_ctxt, Name));
2353         buf->ccontext.NameLength = cpu_to_le16(4);
2354         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2355         buf->Name[0] = 'Q';
2356         buf->Name[1] = 'F';
2357         buf->Name[2] = 'i';
2358         buf->Name[3] = 'd';
2359         return buf;
2360 }
2361
2362 /* See MS-SMB2 2.2.13.2.9 */
2363 static int
2364 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2365 {
2366         struct smb2_create_req *req = iov[0].iov_base;
2367         unsigned int num = *num_iovec;
2368
2369         iov[num].iov_base = create_query_id_buf();
2370         if (iov[num].iov_base == NULL)
2371                 return -ENOMEM;
2372         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2373         if (!req->CreateContextsOffset)
2374                 req->CreateContextsOffset = cpu_to_le32(
2375                                 sizeof(struct smb2_create_req) +
2376                                 iov[num - 1].iov_len);
2377         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2378         *num_iovec = num + 1;
2379         return 0;
2380 }
2381
2382 static int
2383 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2384                             const char *treename, const __le16 *path)
2385 {
2386         int treename_len, path_len;
2387         struct nls_table *cp;
2388         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2389
2390         /*
2391          * skip leading "\\"
2392          */
2393         treename_len = strlen(treename);
2394         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2395                 return -EINVAL;
2396
2397         treename += 2;
2398         treename_len -= 2;
2399
2400         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2401
2402         /*
2403          * make room for one path separator between the treename and
2404          * path
2405          */
2406         *out_len = treename_len + 1 + path_len;
2407
2408         /*
2409          * final path needs to be null-terminated UTF16 with a
2410          * size aligned to 8
2411          */
2412
2413         *out_size = roundup((*out_len+1)*2, 8);
2414         *out_path = kzalloc(*out_size, GFP_KERNEL);
2415         if (!*out_path)
2416                 return -ENOMEM;
2417
2418         cp = load_nls_default();
2419         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2420         UniStrcat(*out_path, sep);
2421         UniStrcat(*out_path, path);
2422         unload_nls(cp);
2423
2424         return 0;
2425 }
2426
2427 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2428                                umode_t mode, struct cifs_tcon *tcon,
2429                                const char *full_path,
2430                                struct cifs_sb_info *cifs_sb)
2431 {
2432         struct smb_rqst rqst;
2433         struct smb2_create_req *req;
2434         struct smb2_create_rsp *rsp = NULL;
2435         struct cifs_ses *ses = tcon->ses;
2436         struct kvec iov[3]; /* make sure at least one for each open context */
2437         struct kvec rsp_iov = {NULL, 0};
2438         int resp_buftype;
2439         int uni_path_len;
2440         __le16 *copy_path = NULL;
2441         int copy_size;
2442         int rc = 0;
2443         unsigned int n_iov = 2;
2444         __u32 file_attributes = 0;
2445         char *pc_buf = NULL;
2446         int flags = 0;
2447         unsigned int total_len;
2448         __le16 *utf16_path = NULL;
2449         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2450
2451         cifs_dbg(FYI, "mkdir\n");
2452
2453         /* resource #1: path allocation */
2454         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2455         if (!utf16_path)
2456                 return -ENOMEM;
2457
2458         if (!ses || !server) {
2459                 rc = -EIO;
2460                 goto err_free_path;
2461         }
2462
2463         /* resource #2: request */
2464         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2465                                  (void **) &req, &total_len);
2466         if (rc)
2467                 goto err_free_path;
2468
2469
2470         if (smb3_encryption_required(tcon))
2471                 flags |= CIFS_TRANSFORM_REQ;
2472
2473         req->ImpersonationLevel = IL_IMPERSONATION;
2474         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2475         /* File attributes ignored on open (used in create though) */
2476         req->FileAttributes = cpu_to_le32(file_attributes);
2477         req->ShareAccess = FILE_SHARE_ALL_LE;
2478         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2479         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2480
2481         iov[0].iov_base = (char *)req;
2482         /* -1 since last byte is buf[0] which is sent below (path) */
2483         iov[0].iov_len = total_len - 1;
2484
2485         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2486
2487         /* [MS-SMB2] 2.2.13 NameOffset:
2488          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2489          * the SMB2 header, the file name includes a prefix that will
2490          * be processed during DFS name normalization as specified in
2491          * section 3.3.5.9. Otherwise, the file name is relative to
2492          * the share that is identified by the TreeId in the SMB2
2493          * header.
2494          */
2495         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2496                 int name_len;
2497
2498                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2499                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2500                                                  &name_len,
2501                                                  tcon->treeName, utf16_path);
2502                 if (rc)
2503                         goto err_free_req;
2504
2505                 req->NameLength = cpu_to_le16(name_len * 2);
2506                 uni_path_len = copy_size;
2507                 /* free before overwriting resource */
2508                 kfree(utf16_path);
2509                 utf16_path = copy_path;
2510         } else {
2511                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2512                 /* MUST set path len (NameLength) to 0 opening root of share */
2513                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2514                 if (uni_path_len % 8 != 0) {
2515                         copy_size = roundup(uni_path_len, 8);
2516                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2517                         if (!copy_path) {
2518                                 rc = -ENOMEM;
2519                                 goto err_free_req;
2520                         }
2521                         memcpy((char *)copy_path, (const char *)utf16_path,
2522                                uni_path_len);
2523                         uni_path_len = copy_size;
2524                         /* free before overwriting resource */
2525                         kfree(utf16_path);
2526                         utf16_path = copy_path;
2527                 }
2528         }
2529
2530         iov[1].iov_len = uni_path_len;
2531         iov[1].iov_base = utf16_path;
2532         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2533
2534         if (tcon->posix_extensions) {
2535                 /* resource #3: posix buf */
2536                 rc = add_posix_context(iov, &n_iov, mode);
2537                 if (rc)
2538                         goto err_free_req;
2539                 pc_buf = iov[n_iov-1].iov_base;
2540         }
2541
2542
2543         memset(&rqst, 0, sizeof(struct smb_rqst));
2544         rqst.rq_iov = iov;
2545         rqst.rq_nvec = n_iov;
2546
2547         /* no need to inc num_remote_opens because we close it just below */
2548         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2549                                     FILE_WRITE_ATTRIBUTES);
2550         /* resource #4: response buffer */
2551         rc = cifs_send_recv(xid, ses, server,
2552                             &rqst, &resp_buftype, flags, &rsp_iov);
2553         if (rc) {
2554                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2555                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2556                                            CREATE_NOT_FILE,
2557                                            FILE_WRITE_ATTRIBUTES, rc);
2558                 goto err_free_rsp_buf;
2559         }
2560
2561         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2562         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2563                                     ses->Suid, CREATE_NOT_FILE,
2564                                     FILE_WRITE_ATTRIBUTES);
2565
2566         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2567
2568         /* Eventually save off posix specific response info and timestaps */
2569
2570 err_free_rsp_buf:
2571         free_rsp_buf(resp_buftype, rsp);
2572         kfree(pc_buf);
2573 err_free_req:
2574         cifs_small_buf_release(req);
2575 err_free_path:
2576         kfree(utf16_path);
2577         return rc;
2578 }
2579
2580 int
2581 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2582                struct smb_rqst *rqst, __u8 *oplock,
2583                struct cifs_open_parms *oparms, __le16 *path)
2584 {
2585         struct smb2_create_req *req;
2586         unsigned int n_iov = 2;
2587         __u32 file_attributes = 0;
2588         int copy_size;
2589         int uni_path_len;
2590         unsigned int total_len;
2591         struct kvec *iov = rqst->rq_iov;
2592         __le16 *copy_path;
2593         int rc;
2594
2595         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2596                                  (void **) &req, &total_len);
2597         if (rc)
2598                 return rc;
2599
2600         iov[0].iov_base = (char *)req;
2601         /* -1 since last byte is buf[0] which is sent below (path) */
2602         iov[0].iov_len = total_len - 1;
2603
2604         if (oparms->create_options & CREATE_OPTION_READONLY)
2605                 file_attributes |= ATTR_READONLY;
2606         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2607                 file_attributes |= ATTR_SYSTEM;
2608
2609         req->ImpersonationLevel = IL_IMPERSONATION;
2610         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2611         /* File attributes ignored on open (used in create though) */
2612         req->FileAttributes = cpu_to_le32(file_attributes);
2613         req->ShareAccess = FILE_SHARE_ALL_LE;
2614
2615         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2616         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2617         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2618
2619         /* [MS-SMB2] 2.2.13 NameOffset:
2620          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2621          * the SMB2 header, the file name includes a prefix that will
2622          * be processed during DFS name normalization as specified in
2623          * section 3.3.5.9. Otherwise, the file name is relative to
2624          * the share that is identified by the TreeId in the SMB2
2625          * header.
2626          */
2627         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2628                 int name_len;
2629
2630                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2631                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2632                                                  &name_len,
2633                                                  tcon->treeName, path);
2634                 if (rc)
2635                         return rc;
2636                 req->NameLength = cpu_to_le16(name_len * 2);
2637                 uni_path_len = copy_size;
2638                 path = copy_path;
2639         } else {
2640                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2641                 /* MUST set path len (NameLength) to 0 opening root of share */
2642                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2643                 copy_size = uni_path_len;
2644                 if (copy_size % 8 != 0)
2645                         copy_size = roundup(copy_size, 8);
2646                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2647                 if (!copy_path)
2648                         return -ENOMEM;
2649                 memcpy((char *)copy_path, (const char *)path,
2650                        uni_path_len);
2651                 uni_path_len = copy_size;
2652                 path = copy_path;
2653         }
2654
2655         iov[1].iov_len = uni_path_len;
2656         iov[1].iov_base = path;
2657
2658         if ((!server->oplocks) || (tcon->no_lease))
2659                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2660
2661         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2662             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2663                 req->RequestedOplockLevel = *oplock;
2664         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2665                   (oparms->create_options & CREATE_NOT_FILE))
2666                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2667         else {
2668                 rc = add_lease_context(server, iov, &n_iov,
2669                                        oparms->fid->lease_key, oplock);
2670                 if (rc)
2671                         return rc;
2672         }
2673
2674         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2675                 /* need to set Next field of lease context if we request it */
2676                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2677                         struct create_context *ccontext =
2678                             (struct create_context *)iov[n_iov-1].iov_base;
2679                         ccontext->Next =
2680                                 cpu_to_le32(server->vals->create_lease_size);
2681                 }
2682
2683                 rc = add_durable_context(iov, &n_iov, oparms,
2684                                         tcon->use_persistent);
2685                 if (rc)
2686                         return rc;
2687         }
2688
2689         if (tcon->posix_extensions) {
2690                 if (n_iov > 2) {
2691                         struct create_context *ccontext =
2692                             (struct create_context *)iov[n_iov-1].iov_base;
2693                         ccontext->Next =
2694                                 cpu_to_le32(iov[n_iov-1].iov_len);
2695                 }
2696
2697                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2698                 if (rc)
2699                         return rc;
2700         }
2701
2702         if (tcon->snapshot_time) {
2703                 cifs_dbg(FYI, "adding snapshot context\n");
2704                 if (n_iov > 2) {
2705                         struct create_context *ccontext =
2706                             (struct create_context *)iov[n_iov-1].iov_base;
2707                         ccontext->Next =
2708                                 cpu_to_le32(iov[n_iov-1].iov_len);
2709                 }
2710
2711                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2712                 if (rc)
2713                         return rc;
2714         }
2715
2716         if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
2717                 bool set_mode;
2718                 bool set_owner;
2719
2720                 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2721                     (oparms->mode != ACL_NO_MODE))
2722                         set_mode = true;
2723                 else {
2724                         set_mode = false;
2725                         oparms->mode = ACL_NO_MODE;
2726                 }
2727
2728                 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
2729                         set_owner = true;
2730                 else
2731                         set_owner = false;
2732
2733                 if (set_owner | set_mode) {
2734                         if (n_iov > 2) {
2735                                 struct create_context *ccontext =
2736                                     (struct create_context *)iov[n_iov-1].iov_base;
2737                                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2738                         }
2739
2740                         cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2741                         rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
2742                         if (rc)
2743                                 return rc;
2744                 }
2745         }
2746
2747         if (n_iov > 2) {
2748                 struct create_context *ccontext =
2749                         (struct create_context *)iov[n_iov-1].iov_base;
2750                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2751         }
2752         add_query_id_context(iov, &n_iov);
2753
2754         rqst->rq_nvec = n_iov;
2755         return 0;
2756 }
2757
2758 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2759  * All other vectors are freed by kfree().
2760  */
2761 void
2762 SMB2_open_free(struct smb_rqst *rqst)
2763 {
2764         int i;
2765
2766         if (rqst && rqst->rq_iov) {
2767                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2768                 for (i = 1; i < rqst->rq_nvec; i++)
2769                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2770                                 kfree(rqst->rq_iov[i].iov_base);
2771         }
2772 }
2773
2774 int
2775 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2776           __u8 *oplock, struct smb2_file_all_info *buf,
2777           struct create_posix_rsp *posix,
2778           struct kvec *err_iov, int *buftype)
2779 {
2780         struct smb_rqst rqst;
2781         struct smb2_create_rsp *rsp = NULL;
2782         struct cifs_tcon *tcon = oparms->tcon;
2783         struct cifs_ses *ses = tcon->ses;
2784         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2785         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2786         struct kvec rsp_iov = {NULL, 0};
2787         int resp_buftype = CIFS_NO_BUFFER;
2788         int rc = 0;
2789         int flags = 0;
2790
2791         cifs_dbg(FYI, "create/open\n");
2792         if (!ses || !server)
2793                 return -EIO;
2794
2795         if (smb3_encryption_required(tcon))
2796                 flags |= CIFS_TRANSFORM_REQ;
2797
2798         memset(&rqst, 0, sizeof(struct smb_rqst));
2799         memset(&iov, 0, sizeof(iov));
2800         rqst.rq_iov = iov;
2801         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2802
2803         rc = SMB2_open_init(tcon, server,
2804                             &rqst, oplock, oparms, path);
2805         if (rc)
2806                 goto creat_exit;
2807
2808         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2809                 oparms->create_options, oparms->desired_access);
2810
2811         rc = cifs_send_recv(xid, ses, server,
2812                             &rqst, &resp_buftype, flags,
2813                             &rsp_iov);
2814         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2815
2816         if (rc != 0) {
2817                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2818                 if (err_iov && rsp) {
2819                         *err_iov = rsp_iov;
2820                         *buftype = resp_buftype;
2821                         resp_buftype = CIFS_NO_BUFFER;
2822                         rsp = NULL;
2823                 }
2824                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2825                                     oparms->create_options, oparms->desired_access, rc);
2826                 if (rc == -EREMCHG) {
2827                         pr_warn_once("server share %s deleted\n",
2828                                      tcon->treeName);
2829                         tcon->need_reconnect = true;
2830                 }
2831                 goto creat_exit;
2832         } else
2833                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2834                                      ses->Suid, oparms->create_options,
2835                                      oparms->desired_access);
2836
2837         atomic_inc(&tcon->num_remote_opens);
2838         oparms->fid->persistent_fid = rsp->PersistentFileId;
2839         oparms->fid->volatile_fid = rsp->VolatileFileId;
2840         oparms->fid->access = oparms->desired_access;
2841 #ifdef CONFIG_CIFS_DEBUG2
2842         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2843 #endif /* CIFS_DEBUG2 */
2844
2845         if (buf) {
2846                 memcpy(buf, &rsp->CreationTime, 32);
2847                 buf->AllocationSize = rsp->AllocationSize;
2848                 buf->EndOfFile = rsp->EndofFile;
2849                 buf->Attributes = rsp->FileAttributes;
2850                 buf->NumberOfLinks = cpu_to_le32(1);
2851                 buf->DeletePending = 0;
2852         }
2853
2854
2855         smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
2856                             oparms->fid->lease_key, oplock, buf, posix);
2857 creat_exit:
2858         SMB2_open_free(&rqst);
2859         free_rsp_buf(resp_buftype, rsp);
2860         return rc;
2861 }
2862
2863 int
2864 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2865                 struct smb_rqst *rqst,
2866                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2867                 bool is_fsctl, char *in_data, u32 indatalen,
2868                 __u32 max_response_size)
2869 {
2870         struct smb2_ioctl_req *req;
2871         struct kvec *iov = rqst->rq_iov;
2872         unsigned int total_len;
2873         int rc;
2874         char *in_data_buf;
2875
2876         rc = smb2_ioctl_req_init(opcode, tcon, server,
2877                                  (void **) &req, &total_len);
2878         if (rc)
2879                 return rc;
2880
2881         if (indatalen) {
2882                 /*
2883                  * indatalen is usually small at a couple of bytes max, so
2884                  * just allocate through generic pool
2885                  */
2886                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
2887                 if (!in_data_buf) {
2888                         cifs_small_buf_release(req);
2889                         return -ENOMEM;
2890                 }
2891         }
2892
2893         req->CtlCode = cpu_to_le32(opcode);
2894         req->PersistentFileId = persistent_fid;
2895         req->VolatileFileId = volatile_fid;
2896
2897         iov[0].iov_base = (char *)req;
2898         /*
2899          * If no input data, the size of ioctl struct in
2900          * protocol spec still includes a 1 byte data buffer,
2901          * but if input data passed to ioctl, we do not
2902          * want to double count this, so we do not send
2903          * the dummy one byte of data in iovec[0] if sending
2904          * input data (in iovec[1]).
2905          */
2906         if (indatalen) {
2907                 req->InputCount = cpu_to_le32(indatalen);
2908                 /* do not set InputOffset if no input data */
2909                 req->InputOffset =
2910                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2911                 rqst->rq_nvec = 2;
2912                 iov[0].iov_len = total_len - 1;
2913                 iov[1].iov_base = in_data_buf;
2914                 iov[1].iov_len = indatalen;
2915         } else {
2916                 rqst->rq_nvec = 1;
2917                 iov[0].iov_len = total_len;
2918         }
2919
2920         req->OutputOffset = 0;
2921         req->OutputCount = 0; /* MBZ */
2922
2923         /*
2924          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
2925          * We Could increase default MaxOutputResponse, but that could require
2926          * more credits. Windows typically sets this smaller, but for some
2927          * ioctls it may be useful to allow server to send more. No point
2928          * limiting what the server can send as long as fits in one credit
2929          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
2930          * to increase this limit up in the future.
2931          * Note that for snapshot queries that servers like Azure expect that
2932          * the first query be minimal size (and just used to get the number/size
2933          * of previous versions) so response size must be specified as EXACTLY
2934          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2935          * of eight bytes.  Currently that is the only case where we set max
2936          * response size smaller.
2937          */
2938         req->MaxOutputResponse = cpu_to_le32(max_response_size);
2939         req->sync_hdr.CreditCharge =
2940                 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
2941                                          SMB2_MAX_BUFFER_SIZE));
2942         if (is_fsctl)
2943                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2944         else
2945                 req->Flags = 0;
2946
2947         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2948         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2949                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2950
2951         return 0;
2952 }
2953
2954 void
2955 SMB2_ioctl_free(struct smb_rqst *rqst)
2956 {
2957         int i;
2958         if (rqst && rqst->rq_iov) {
2959                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2960                 for (i = 1; i < rqst->rq_nvec; i++)
2961                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2962                                 kfree(rqst->rq_iov[i].iov_base);
2963         }
2964 }
2965
2966
2967 /*
2968  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2969  */
2970 int
2971 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2972            u64 volatile_fid, u32 opcode, bool is_fsctl,
2973            char *in_data, u32 indatalen, u32 max_out_data_len,
2974            char **out_data, u32 *plen /* returned data len */)
2975 {
2976         struct smb_rqst rqst;
2977         struct smb2_ioctl_rsp *rsp = NULL;
2978         struct cifs_ses *ses;
2979         struct TCP_Server_Info *server;
2980         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
2981         struct kvec rsp_iov = {NULL, 0};
2982         int resp_buftype = CIFS_NO_BUFFER;
2983         int rc = 0;
2984         int flags = 0;
2985
2986         cifs_dbg(FYI, "SMB2 IOCTL\n");
2987
2988         if (out_data != NULL)
2989                 *out_data = NULL;
2990
2991         /* zero out returned data len, in case of error */
2992         if (plen)
2993                 *plen = 0;
2994
2995         if (!tcon)
2996                 return -EIO;
2997
2998         ses = tcon->ses;
2999         if (!ses)
3000                 return -EIO;
3001
3002         server = cifs_pick_channel(ses);
3003         if (!server)
3004                 return -EIO;
3005
3006         if (smb3_encryption_required(tcon))
3007                 flags |= CIFS_TRANSFORM_REQ;
3008
3009         memset(&rqst, 0, sizeof(struct smb_rqst));
3010         memset(&iov, 0, sizeof(iov));
3011         rqst.rq_iov = iov;
3012         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3013
3014         rc = SMB2_ioctl_init(tcon, server,
3015                              &rqst, persistent_fid, volatile_fid, opcode,
3016                              is_fsctl, in_data, indatalen, max_out_data_len);
3017         if (rc)
3018                 goto ioctl_exit;
3019
3020         rc = cifs_send_recv(xid, ses, server,
3021                             &rqst, &resp_buftype, flags,
3022                             &rsp_iov);
3023         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3024
3025         if (rc != 0)
3026                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3027                                 ses->Suid, 0, opcode, rc);
3028
3029         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3030                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3031                 goto ioctl_exit;
3032         } else if (rc == -EINVAL) {
3033                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3034                     (opcode != FSCTL_SRV_COPYCHUNK)) {
3035                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3036                         goto ioctl_exit;
3037                 }
3038         } else if (rc == -E2BIG) {
3039                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3040                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3041                         goto ioctl_exit;
3042                 }
3043         }
3044
3045         /* check if caller wants to look at return data or just return rc */
3046         if ((plen == NULL) || (out_data == NULL))
3047                 goto ioctl_exit;
3048
3049         *plen = le32_to_cpu(rsp->OutputCount);
3050
3051         /* We check for obvious errors in the output buffer length and offset */
3052         if (*plen == 0)
3053                 goto ioctl_exit; /* server returned no data */
3054         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3055                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3056                 *plen = 0;
3057                 rc = -EIO;
3058                 goto ioctl_exit;
3059         }
3060
3061         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3062                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3063                         le32_to_cpu(rsp->OutputOffset));
3064                 *plen = 0;
3065                 rc = -EIO;
3066                 goto ioctl_exit;
3067         }
3068
3069         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3070                             *plen, GFP_KERNEL);
3071         if (*out_data == NULL) {
3072                 rc = -ENOMEM;
3073                 goto ioctl_exit;
3074         }
3075
3076 ioctl_exit:
3077         SMB2_ioctl_free(&rqst);
3078         free_rsp_buf(resp_buftype, rsp);
3079         return rc;
3080 }
3081
3082 /*
3083  *   Individual callers to ioctl worker function follow
3084  */
3085
3086 int
3087 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3088                      u64 persistent_fid, u64 volatile_fid)
3089 {
3090         int rc;
3091         struct  compress_ioctl fsctl_input;
3092         char *ret_data = NULL;
3093
3094         fsctl_input.CompressionState =
3095                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3096
3097         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3098                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
3099                         (char *)&fsctl_input /* data input */,
3100                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3101                         &ret_data /* out data */, NULL);
3102
3103         cifs_dbg(FYI, "set compression rc %d\n", rc);
3104
3105         return rc;
3106 }
3107
3108 int
3109 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3110                 struct smb_rqst *rqst,
3111                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3112 {
3113         struct smb2_close_req *req;
3114         struct kvec *iov = rqst->rq_iov;
3115         unsigned int total_len;
3116         int rc;
3117
3118         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3119                                  (void **) &req, &total_len);
3120         if (rc)
3121                 return rc;
3122
3123         req->PersistentFileId = persistent_fid;
3124         req->VolatileFileId = volatile_fid;
3125         if (query_attrs)
3126                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3127         else
3128                 req->Flags = 0;
3129         iov[0].iov_base = (char *)req;
3130         iov[0].iov_len = total_len;
3131
3132         return 0;
3133 }
3134
3135 void
3136 SMB2_close_free(struct smb_rqst *rqst)
3137 {
3138         if (rqst && rqst->rq_iov)
3139                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3140 }
3141
3142 int
3143 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3144              u64 persistent_fid, u64 volatile_fid,
3145              struct smb2_file_network_open_info *pbuf)
3146 {
3147         struct smb_rqst rqst;
3148         struct smb2_close_rsp *rsp = NULL;
3149         struct cifs_ses *ses = tcon->ses;
3150         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3151         struct kvec iov[1];
3152         struct kvec rsp_iov;
3153         int resp_buftype = CIFS_NO_BUFFER;
3154         int rc = 0;
3155         int flags = 0;
3156         bool query_attrs = false;
3157
3158         cifs_dbg(FYI, "Close\n");
3159
3160         if (!ses || !server)
3161                 return -EIO;
3162
3163         if (smb3_encryption_required(tcon))
3164                 flags |= CIFS_TRANSFORM_REQ;
3165
3166         memset(&rqst, 0, sizeof(struct smb_rqst));
3167         memset(&iov, 0, sizeof(iov));
3168         rqst.rq_iov = iov;
3169         rqst.rq_nvec = 1;
3170
3171         /* check if need to ask server to return timestamps in close response */
3172         if (pbuf)
3173                 query_attrs = true;
3174
3175         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3176         rc = SMB2_close_init(tcon, server,
3177                              &rqst, persistent_fid, volatile_fid,
3178                              query_attrs);
3179         if (rc)
3180                 goto close_exit;
3181
3182         rc = cifs_send_recv(xid, ses, server,
3183                             &rqst, &resp_buftype, flags, &rsp_iov);
3184         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3185
3186         if (rc != 0) {
3187                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3188                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3189                                      rc);
3190                 goto close_exit;
3191         } else {
3192                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3193                                       ses->Suid);
3194                 /*
3195                  * Note that have to subtract 4 since struct network_open_info
3196                  * has a final 4 byte pad that close response does not have
3197                  */
3198                 if (pbuf)
3199                         memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3200         }
3201
3202         atomic_dec(&tcon->num_remote_opens);
3203 close_exit:
3204         SMB2_close_free(&rqst);
3205         free_rsp_buf(resp_buftype, rsp);
3206
3207         /* retry close in a worker thread if this one is interrupted */
3208         if (rc == -EINTR) {
3209                 int tmp_rc;
3210
3211                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3212                                                      volatile_fid);
3213                 if (tmp_rc)
3214                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3215                                  persistent_fid, tmp_rc);
3216         }
3217         return rc;
3218 }
3219
3220 int
3221 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3222                 u64 persistent_fid, u64 volatile_fid)
3223 {
3224         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3225 }
3226
3227 int
3228 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3229                   struct kvec *iov, unsigned int min_buf_size)
3230 {
3231         unsigned int smb_len = iov->iov_len;
3232         char *end_of_smb = smb_len + (char *)iov->iov_base;
3233         char *begin_of_buf = offset + (char *)iov->iov_base;
3234         char *end_of_buf = begin_of_buf + buffer_length;
3235
3236
3237         if (buffer_length < min_buf_size) {
3238                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3239                          buffer_length, min_buf_size);
3240                 return -EINVAL;
3241         }
3242
3243         /* check if beyond RFC1001 maximum length */
3244         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3245                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3246                          buffer_length, smb_len);
3247                 return -EINVAL;
3248         }
3249
3250         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3251                 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3252                 return -EINVAL;
3253         }
3254
3255         return 0;
3256 }
3257
3258 /*
3259  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3260  * Caller must free buffer.
3261  */
3262 int
3263 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3264                            struct kvec *iov, unsigned int minbufsize,
3265                            char *data)
3266 {
3267         char *begin_of_buf = offset + (char *)iov->iov_base;
3268         int rc;
3269
3270         if (!data)
3271                 return -EINVAL;
3272
3273         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3274         if (rc)
3275                 return rc;
3276
3277         memcpy(data, begin_of_buf, buffer_length);
3278
3279         return 0;
3280 }
3281
3282 int
3283 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3284                      struct smb_rqst *rqst,
3285                      u64 persistent_fid, u64 volatile_fid,
3286                      u8 info_class, u8 info_type, u32 additional_info,
3287                      size_t output_len, size_t input_len, void *input)
3288 {
3289         struct smb2_query_info_req *req;
3290         struct kvec *iov = rqst->rq_iov;
3291         unsigned int total_len;
3292         int rc;
3293
3294         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3295                                  (void **) &req, &total_len);
3296         if (rc)
3297                 return rc;
3298
3299         req->InfoType = info_type;
3300         req->FileInfoClass = info_class;
3301         req->PersistentFileId = persistent_fid;
3302         req->VolatileFileId = volatile_fid;
3303         req->AdditionalInformation = cpu_to_le32(additional_info);
3304
3305         req->OutputBufferLength = cpu_to_le32(output_len);
3306         if (input_len) {
3307                 req->InputBufferLength = cpu_to_le32(input_len);
3308                 /* total_len for smb query request never close to le16 max */
3309                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3310                 memcpy(req->Buffer, input, input_len);
3311         }
3312
3313         iov[0].iov_base = (char *)req;
3314         /* 1 for Buffer */
3315         iov[0].iov_len = total_len - 1 + input_len;
3316         return 0;
3317 }
3318
3319 void
3320 SMB2_query_info_free(struct smb_rqst *rqst)
3321 {
3322         if (rqst && rqst->rq_iov)
3323                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3324 }
3325
3326 static int
3327 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3328            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3329            u32 additional_info, size_t output_len, size_t min_len, void **data,
3330                 u32 *dlen)
3331 {
3332         struct smb_rqst rqst;
3333         struct smb2_query_info_rsp *rsp = NULL;
3334         struct kvec iov[1];
3335         struct kvec rsp_iov;
3336         int rc = 0;
3337         int resp_buftype = CIFS_NO_BUFFER;
3338         struct cifs_ses *ses = tcon->ses;
3339         struct TCP_Server_Info *server;
3340         int flags = 0;
3341         bool allocated = false;
3342
3343         cifs_dbg(FYI, "Query Info\n");
3344
3345         if (!ses)
3346                 return -EIO;
3347         server = cifs_pick_channel(ses);
3348         if (!server)
3349                 return -EIO;
3350
3351         if (smb3_encryption_required(tcon))
3352                 flags |= CIFS_TRANSFORM_REQ;
3353
3354         memset(&rqst, 0, sizeof(struct smb_rqst));
3355         memset(&iov, 0, sizeof(iov));
3356         rqst.rq_iov = iov;
3357         rqst.rq_nvec = 1;
3358
3359         rc = SMB2_query_info_init(tcon, server,
3360                                   &rqst, persistent_fid, volatile_fid,
3361                                   info_class, info_type, additional_info,
3362                                   output_len, 0, NULL);
3363         if (rc)
3364                 goto qinf_exit;
3365
3366         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3367                                     ses->Suid, info_class, (__u32)info_type);
3368
3369         rc = cifs_send_recv(xid, ses, server,
3370                             &rqst, &resp_buftype, flags, &rsp_iov);
3371         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3372
3373         if (rc) {
3374                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3375                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3376                                 ses->Suid, info_class, (__u32)info_type, rc);
3377                 goto qinf_exit;
3378         }
3379
3380         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3381                                 ses->Suid, info_class, (__u32)info_type);
3382
3383         if (dlen) {
3384                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3385                 if (!*data) {
3386                         *data = kmalloc(*dlen, GFP_KERNEL);
3387                         if (!*data) {
3388                                 cifs_tcon_dbg(VFS,
3389                                         "Error %d allocating memory for acl\n",
3390                                         rc);
3391                                 *dlen = 0;
3392                                 rc = -ENOMEM;
3393                                 goto qinf_exit;
3394                         }
3395                         allocated = true;
3396                 }
3397         }
3398
3399         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3400                                         le32_to_cpu(rsp->OutputBufferLength),
3401                                         &rsp_iov, min_len, *data);
3402         if (rc && allocated) {
3403                 kfree(*data);
3404                 *data = NULL;
3405                 *dlen = 0;
3406         }
3407
3408 qinf_exit:
3409         SMB2_query_info_free(&rqst);
3410         free_rsp_buf(resp_buftype, rsp);
3411         return rc;
3412 }
3413
3414 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3415         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3416 {
3417         return query_info(xid, tcon, persistent_fid, volatile_fid,
3418                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3419                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3420                           sizeof(struct smb2_file_all_info), (void **)&data,
3421                           NULL);
3422 }
3423
3424 int
3425 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3426                 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3427 {
3428         size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3429                         (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3430         *plen = 0;
3431
3432         return query_info(xid, tcon, persistent_fid, volatile_fid,
3433                           SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3434                           output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3435 }
3436
3437 int
3438 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3439                 u64 persistent_fid, u64 volatile_fid,
3440                 void **data, u32 *plen)
3441 {
3442         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
3443         *plen = 0;
3444
3445         return query_info(xid, tcon, persistent_fid, volatile_fid,
3446                           0, SMB2_O_INFO_SECURITY, additional_info,
3447                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3448 }
3449
3450 int
3451 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3452                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3453 {
3454         return query_info(xid, tcon, persistent_fid, volatile_fid,
3455                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3456                           sizeof(struct smb2_file_internal_info),
3457                           sizeof(struct smb2_file_internal_info),
3458                           (void **)&uniqueid, NULL);
3459 }
3460
3461 /*
3462  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3463  * See MS-SMB2 2.2.35 and 2.2.36
3464  */
3465
3466 static int
3467 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3468                  struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3469                  u64 persistent_fid, u64 volatile_fid,
3470                  u32 completion_filter, bool watch_tree)
3471 {
3472         struct smb2_change_notify_req *req;
3473         struct kvec *iov = rqst->rq_iov;
3474         unsigned int total_len;
3475         int rc;
3476
3477         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3478                                  (void **) &req, &total_len);
3479         if (rc)
3480                 return rc;
3481
3482         req->PersistentFileId = persistent_fid;
3483         req->VolatileFileId = volatile_fid;
3484         /* See note 354 of MS-SMB2, 64K max */
3485         req->OutputBufferLength =
3486                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3487         req->CompletionFilter = cpu_to_le32(completion_filter);
3488         if (watch_tree)
3489                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3490         else
3491                 req->Flags = 0;
3492
3493         iov[0].iov_base = (char *)req;
3494         iov[0].iov_len = total_len;
3495
3496         return 0;
3497 }
3498
3499 int
3500 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3501                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3502                 u32 completion_filter)
3503 {
3504         struct cifs_ses *ses = tcon->ses;
3505         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3506         struct smb_rqst rqst;
3507         struct kvec iov[1];
3508         struct kvec rsp_iov = {NULL, 0};
3509         int resp_buftype = CIFS_NO_BUFFER;
3510         int flags = 0;
3511         int rc = 0;
3512
3513         cifs_dbg(FYI, "change notify\n");
3514         if (!ses || !server)
3515                 return -EIO;
3516
3517         if (smb3_encryption_required(tcon))
3518                 flags |= CIFS_TRANSFORM_REQ;
3519
3520         memset(&rqst, 0, sizeof(struct smb_rqst));
3521         memset(&iov, 0, sizeof(iov));
3522         rqst.rq_iov = iov;
3523         rqst.rq_nvec = 1;
3524
3525         rc = SMB2_notify_init(xid, &rqst, tcon, server,
3526                               persistent_fid, volatile_fid,
3527                               completion_filter, watch_tree);
3528         if (rc)
3529                 goto cnotify_exit;
3530
3531         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3532                                 (u8)watch_tree, completion_filter);
3533         rc = cifs_send_recv(xid, ses, server,
3534                             &rqst, &resp_buftype, flags, &rsp_iov);
3535
3536         if (rc != 0) {
3537                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3538                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3539                                 (u8)watch_tree, completion_filter, rc);
3540         } else
3541                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3542                                 ses->Suid, (u8)watch_tree, completion_filter);
3543
3544  cnotify_exit:
3545         if (rqst.rq_iov)
3546                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3547         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3548         return rc;
3549 }
3550
3551
3552
3553 /*
3554  * This is a no-op for now. We're not really interested in the reply, but
3555  * rather in the fact that the server sent one and that server->lstrp
3556  * gets updated.
3557  *
3558  * FIXME: maybe we should consider checking that the reply matches request?
3559  */
3560 static void
3561 smb2_echo_callback(struct mid_q_entry *mid)
3562 {
3563         struct TCP_Server_Info *server = mid->callback_data;
3564         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3565         struct cifs_credits credits = { .value = 0, .instance = 0 };
3566
3567         if (mid->mid_state == MID_RESPONSE_RECEIVED
3568             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3569                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3570                 credits.instance = server->reconnect_instance;
3571         }
3572
3573         DeleteMidQEntry(mid);
3574         add_credits(server, &credits, CIFS_ECHO_OP);
3575 }
3576
3577 void smb2_reconnect_server(struct work_struct *work)
3578 {
3579         struct TCP_Server_Info *server = container_of(work,
3580                                         struct TCP_Server_Info, reconnect.work);
3581         struct cifs_ses *ses;
3582         struct cifs_tcon *tcon, *tcon2;
3583         struct list_head tmp_list;
3584         int tcon_exist = false;
3585         int rc;
3586         int resched = false;
3587
3588
3589         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3590         mutex_lock(&server->reconnect_mutex);
3591
3592         INIT_LIST_HEAD(&tmp_list);
3593         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3594
3595         spin_lock(&cifs_tcp_ses_lock);
3596         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3597                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3598                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3599                                 tcon->tc_count++;
3600                                 list_add_tail(&tcon->rlist, &tmp_list);
3601                                 tcon_exist = true;
3602                         }
3603                 }
3604                 /*
3605                  * IPC has the same lifetime as its session and uses its
3606                  * refcount.
3607                  */
3608                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3609                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3610                         tcon_exist = true;
3611                         ses->ses_count++;
3612                 }
3613         }
3614         /*
3615          * Get the reference to server struct to be sure that the last call of
3616          * cifs_put_tcon() in the loop below won't release the server pointer.
3617          */
3618         if (tcon_exist)
3619                 server->srv_count++;
3620
3621         spin_unlock(&cifs_tcp_ses_lock);
3622
3623         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3624                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3625                 if (!rc)
3626                         cifs_reopen_persistent_handles(tcon);
3627                 else
3628                         resched = true;
3629                 list_del_init(&tcon->rlist);
3630                 if (tcon->ipc)
3631                         cifs_put_smb_ses(tcon->ses);
3632                 else
3633                         cifs_put_tcon(tcon);
3634         }
3635
3636         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3637         if (resched)
3638                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3639         mutex_unlock(&server->reconnect_mutex);
3640
3641         /* now we can safely release srv struct */
3642         if (tcon_exist)
3643                 cifs_put_tcp_session(server, 1);
3644 }
3645
3646 int
3647 SMB2_echo(struct TCP_Server_Info *server)
3648 {
3649         struct smb2_echo_req *req;
3650         int rc = 0;
3651         struct kvec iov[1];
3652         struct smb_rqst rqst = { .rq_iov = iov,
3653                                  .rq_nvec = 1 };
3654         unsigned int total_len;
3655
3656         cifs_dbg(FYI, "In echo request\n");
3657
3658         if (server->tcpStatus == CifsNeedNegotiate) {
3659                 /* No need to send echo on newly established connections */
3660                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
3661                 return rc;
3662         }
3663
3664         rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
3665                                  (void **)&req, &total_len);
3666         if (rc)
3667                 return rc;
3668
3669         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3670
3671         iov[0].iov_len = total_len;
3672         iov[0].iov_base = (char *)req;
3673
3674         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3675                              server, CIFS_ECHO_OP, NULL);
3676         if (rc)
3677                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3678
3679         cifs_small_buf_release(req);
3680         return rc;
3681 }
3682
3683 void
3684 SMB2_flush_free(struct smb_rqst *rqst)
3685 {
3686         if (rqst && rqst->rq_iov)
3687                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3688 }
3689
3690 int
3691 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3692                 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3693                 u64 persistent_fid, u64 volatile_fid)
3694 {
3695         struct smb2_flush_req *req;
3696         struct kvec *iov = rqst->rq_iov;
3697         unsigned int total_len;
3698         int rc;
3699
3700         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
3701                                  (void **) &req, &total_len);
3702         if (rc)
3703                 return rc;
3704
3705         req->PersistentFileId = persistent_fid;
3706         req->VolatileFileId = volatile_fid;
3707
3708         iov[0].iov_base = (char *)req;
3709         iov[0].iov_len = total_len;
3710
3711         return 0;
3712 }
3713
3714 int
3715 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3716            u64 volatile_fid)
3717 {
3718         struct cifs_ses *ses = tcon->ses;
3719         struct smb_rqst rqst;
3720         struct kvec iov[1];
3721         struct kvec rsp_iov = {NULL, 0};
3722         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3723         int resp_buftype = CIFS_NO_BUFFER;
3724         int flags = 0;
3725         int rc = 0;
3726
3727         cifs_dbg(FYI, "flush\n");
3728         if (!ses || !(ses->server))
3729                 return -EIO;
3730
3731         if (smb3_encryption_required(tcon))
3732                 flags |= CIFS_TRANSFORM_REQ;
3733
3734         memset(&rqst, 0, sizeof(struct smb_rqst));
3735         memset(&iov, 0, sizeof(iov));
3736         rqst.rq_iov = iov;
3737         rqst.rq_nvec = 1;
3738
3739         rc = SMB2_flush_init(xid, &rqst, tcon, server,
3740                              persistent_fid, volatile_fid);
3741         if (rc)
3742                 goto flush_exit;
3743
3744         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3745         rc = cifs_send_recv(xid, ses, server,
3746                             &rqst, &resp_buftype, flags, &rsp_iov);
3747
3748         if (rc != 0) {
3749                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3750                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3751                                      rc);
3752         } else
3753                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
3754                                       ses->Suid);
3755
3756  flush_exit:
3757         SMB2_flush_free(&rqst);
3758         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3759         return rc;
3760 }
3761
3762 /*
3763  * To form a chain of read requests, any read requests after the first should
3764  * have the end_of_chain boolean set to true.
3765  */
3766 static int
3767 smb2_new_read_req(void **buf, unsigned int *total_len,
3768         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3769         unsigned int remaining_bytes, int request_type)
3770 {
3771         int rc = -EACCES;
3772         struct smb2_read_plain_req *req = NULL;
3773         struct smb2_sync_hdr *shdr;
3774         struct TCP_Server_Info *server = io_parms->server;
3775
3776         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
3777                                  (void **) &req, total_len);
3778         if (rc)
3779                 return rc;
3780
3781         if (server == NULL)
3782                 return -ECONNABORTED;
3783
3784         shdr = &req->sync_hdr;
3785         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3786
3787         req->PersistentFileId = io_parms->persistent_fid;
3788         req->VolatileFileId = io_parms->volatile_fid;
3789         req->ReadChannelInfoOffset = 0; /* reserved */
3790         req->ReadChannelInfoLength = 0; /* reserved */
3791         req->Channel = 0; /* reserved */
3792         req->MinimumCount = 0;
3793         req->Length = cpu_to_le32(io_parms->length);
3794         req->Offset = cpu_to_le64(io_parms->offset);
3795
3796         trace_smb3_read_enter(0 /* xid */,
3797                         io_parms->persistent_fid,
3798                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3799                         io_parms->offset, io_parms->length);
3800 #ifdef CONFIG_CIFS_SMB_DIRECT
3801         /*
3802          * If we want to do a RDMA write, fill in and append
3803          * smbd_buffer_descriptor_v1 to the end of read request
3804          */
3805         if (server->rdma && rdata && !server->sign &&
3806                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3807
3808                 struct smbd_buffer_descriptor_v1 *v1;
3809                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3810
3811                 rdata->mr = smbd_register_mr(
3812                                 server->smbd_conn, rdata->pages,
3813                                 rdata->nr_pages, rdata->page_offset,
3814                                 rdata->tailsz, true, need_invalidate);
3815                 if (!rdata->mr)
3816                         return -EAGAIN;
3817
3818                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3819                 if (need_invalidate)
3820                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3821                 req->ReadChannelInfoOffset =
3822                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3823                 req->ReadChannelInfoLength =
3824                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3825                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3826                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3827                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3828                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3829
3830                 *total_len += sizeof(*v1) - 1;
3831         }
3832 #endif
3833         if (request_type & CHAINED_REQUEST) {
3834                 if (!(request_type & END_OF_CHAIN)) {
3835                         /* next 8-byte aligned request */
3836                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3837                         shdr->NextCommand = cpu_to_le32(*total_len);
3838                 } else /* END_OF_CHAIN */
3839                         shdr->NextCommand = 0;
3840                 if (request_type & RELATED_REQUEST) {
3841                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3842                         /*
3843                          * Related requests use info from previous read request
3844                          * in chain.
3845                          */
3846                         shdr->SessionId = 0xFFFFFFFF;
3847                         shdr->TreeId = 0xFFFFFFFF;
3848                         req->PersistentFileId = 0xFFFFFFFF;
3849                         req->VolatileFileId = 0xFFFFFFFF;
3850                 }
3851         }
3852         if (remaining_bytes > io_parms->length)
3853                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3854         else
3855                 req->RemainingBytes = 0;
3856
3857         *buf = req;
3858         return rc;
3859 }
3860
3861 static void
3862 smb2_readv_callback(struct mid_q_entry *mid)
3863 {
3864         struct cifs_readdata *rdata = mid->callback_data;
3865         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3866         struct TCP_Server_Info *server = rdata->server;
3867         struct smb2_sync_hdr *shdr =
3868                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3869         struct cifs_credits credits = { .value = 0, .instance = 0 };
3870         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
3871                                  .rq_nvec = 1,
3872                                  .rq_pages = rdata->pages,
3873                                  .rq_offset = rdata->page_offset,
3874                                  .rq_npages = rdata->nr_pages,
3875                                  .rq_pagesz = rdata->pagesz,
3876                                  .rq_tailsz = rdata->tailsz };
3877
3878         WARN_ONCE(rdata->server != mid->server,
3879                   "rdata server %p != mid server %p",
3880                   rdata->server, mid->server);
3881
3882         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3883                  __func__, mid->mid, mid->mid_state, rdata->result,
3884                  rdata->bytes);
3885
3886         switch (mid->mid_state) {
3887         case MID_RESPONSE_RECEIVED:
3888                 credits.value = le16_to_cpu(shdr->CreditRequest);
3889                 credits.instance = server->reconnect_instance;
3890                 /* result already set, check signature */
3891                 if (server->sign && !mid->decrypted) {
3892                         int rc;
3893
3894                         rc = smb2_verify_signature(&rqst, server);
3895                         if (rc)
3896                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
3897                                          rc);
3898                 }
3899                 /* FIXME: should this be counted toward the initiating task? */
3900                 task_io_account_read(rdata->got_bytes);
3901                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3902                 break;
3903         case MID_REQUEST_SUBMITTED:
3904         case MID_RETRY_NEEDED:
3905                 rdata->result = -EAGAIN;
3906                 if (server->sign && rdata->got_bytes)
3907                         /* reset bytes number since we can not check a sign */
3908                         rdata->got_bytes = 0;
3909                 /* FIXME: should this be counted toward the initiating task? */
3910                 task_io_account_read(rdata->got_bytes);
3911                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3912                 break;
3913         case MID_RESPONSE_MALFORMED:
3914                 credits.value = le16_to_cpu(shdr->CreditRequest);
3915                 credits.instance = server->reconnect_instance;
3916                 fallthrough;
3917         default:
3918                 rdata->result = -EIO;
3919         }
3920 #ifdef CONFIG_CIFS_SMB_DIRECT
3921         /*
3922          * If this rdata has a memmory registered, the MR can be freed
3923          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3924          * because they have limited number and are used for future I/Os
3925          */
3926         if (rdata->mr) {
3927                 smbd_deregister_mr(rdata->mr);
3928                 rdata->mr = NULL;
3929         }
3930 #endif
3931         if (rdata->result && rdata->result != -ENODATA) {
3932                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3933                 trace_smb3_read_err(0 /* xid */,
3934                                     rdata->cfile->fid.persistent_fid,
3935                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3936                                     rdata->bytes, rdata->result);
3937         } else
3938                 trace_smb3_read_done(0 /* xid */,
3939                                      rdata->cfile->fid.persistent_fid,
3940                                      tcon->tid, tcon->ses->Suid,
3941                                      rdata->offset, rdata->got_bytes);
3942
3943         queue_work(cifsiod_wq, &rdata->work);
3944         DeleteMidQEntry(mid);
3945         add_credits(server, &credits, 0);
3946 }
3947
3948 /* smb2_async_readv - send an async read, and set up mid to handle result */
3949 int
3950 smb2_async_readv(struct cifs_readdata *rdata)
3951 {
3952         int rc, flags = 0;
3953         char *buf;
3954         struct smb2_sync_hdr *shdr;
3955         struct cifs_io_parms io_parms;
3956         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3957                                  .rq_nvec = 1 };
3958         struct TCP_Server_Info *server;
3959         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3960         unsigned int total_len;
3961
3962         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3963                  __func__, rdata->offset, rdata->bytes);
3964
3965         if (!rdata->server)
3966                 rdata->server = cifs_pick_channel(tcon->ses);
3967
3968         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3969         io_parms.server = server = rdata->server;
3970         io_parms.offset = rdata->offset;
3971         io_parms.length = rdata->bytes;
3972         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3973         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3974         io_parms.pid = rdata->pid;
3975
3976         rc = smb2_new_read_req(
3977                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3978         if (rc)
3979                 return rc;
3980
3981         if (smb3_encryption_required(io_parms.tcon))
3982                 flags |= CIFS_TRANSFORM_REQ;
3983
3984         rdata->iov[0].iov_base = buf;
3985         rdata->iov[0].iov_len = total_len;
3986
3987         shdr = (struct smb2_sync_hdr *)buf;
3988
3989         if (rdata->credits.value > 0) {
3990                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3991                                                 SMB2_MAX_BUFFER_SIZE));
3992                 shdr->CreditRequest =
3993                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3994
3995                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
3996                 if (rc)
3997                         goto async_readv_out;
3998
3999                 flags |= CIFS_HAS_CREDITS;
4000         }
4001
4002         kref_get(&rdata->refcount);
4003         rc = cifs_call_async(server, &rqst,
4004                              cifs_readv_receive, smb2_readv_callback,
4005                              smb3_handle_read_data, rdata, flags,
4006                              &rdata->credits);
4007         if (rc) {
4008                 kref_put(&rdata->refcount, cifs_readdata_release);
4009                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4010                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4011                                     io_parms.tcon->tid,
4012                                     io_parms.tcon->ses->Suid,
4013                                     io_parms.offset, io_parms.length, rc);
4014         }
4015
4016 async_readv_out:
4017         cifs_small_buf_release(buf);
4018         return rc;
4019 }
4020
4021 int
4022 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4023           unsigned int *nbytes, char **buf, int *buf_type)
4024 {
4025         struct smb_rqst rqst;
4026         int resp_buftype, rc;
4027         struct smb2_read_plain_req *req = NULL;
4028         struct smb2_read_rsp *rsp = NULL;
4029         struct kvec iov[1];
4030         struct kvec rsp_iov;
4031         unsigned int total_len;
4032         int flags = CIFS_LOG_ERROR;
4033         struct cifs_ses *ses = io_parms->tcon->ses;
4034
4035         if (!io_parms->server)
4036                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4037
4038         *nbytes = 0;
4039         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4040         if (rc)
4041                 return rc;
4042
4043         if (smb3_encryption_required(io_parms->tcon))
4044                 flags |= CIFS_TRANSFORM_REQ;
4045
4046         iov[0].iov_base = (char *)req;
4047         iov[0].iov_len = total_len;
4048
4049         memset(&rqst, 0, sizeof(struct smb_rqst));
4050         rqst.rq_iov = iov;
4051         rqst.rq_nvec = 1;
4052
4053         rc = cifs_send_recv(xid, ses, io_parms->server,
4054                             &rqst, &resp_buftype, flags, &rsp_iov);
4055         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4056
4057         if (rc) {
4058                 if (rc != -ENODATA) {
4059                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4060                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
4061                         trace_smb3_read_err(xid, req->PersistentFileId,
4062                                             io_parms->tcon->tid, ses->Suid,
4063                                             io_parms->offset, io_parms->length,
4064                                             rc);
4065                 } else
4066                         trace_smb3_read_done(xid, req->PersistentFileId,
4067                                     io_parms->tcon->tid, ses->Suid,
4068                                     io_parms->offset, 0);
4069                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4070                 cifs_small_buf_release(req);
4071                 return rc == -ENODATA ? 0 : rc;
4072         } else
4073                 trace_smb3_read_done(xid, req->PersistentFileId,
4074                                     io_parms->tcon->tid, ses->Suid,
4075                                     io_parms->offset, io_parms->length);
4076
4077         cifs_small_buf_release(req);
4078
4079         *nbytes = le32_to_cpu(rsp->DataLength);
4080         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4081             (*nbytes > io_parms->length)) {
4082                 cifs_dbg(FYI, "bad length %d for count %d\n",
4083                          *nbytes, io_parms->length);
4084                 rc = -EIO;
4085                 *nbytes = 0;
4086         }
4087
4088         if (*buf) {
4089                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4090                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4091         } else if (resp_buftype != CIFS_NO_BUFFER) {
4092                 *buf = rsp_iov.iov_base;
4093                 if (resp_buftype == CIFS_SMALL_BUFFER)
4094                         *buf_type = CIFS_SMALL_BUFFER;
4095                 else if (resp_buftype == CIFS_LARGE_BUFFER)
4096                         *buf_type = CIFS_LARGE_BUFFER;
4097         }
4098         return rc;
4099 }
4100
4101 /*
4102  * Check the mid_state and signature on received buffer (if any), and queue the
4103  * workqueue completion task.
4104  */
4105 static void
4106 smb2_writev_callback(struct mid_q_entry *mid)
4107 {
4108         struct cifs_writedata *wdata = mid->callback_data;
4109         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4110         struct TCP_Server_Info *server = wdata->server;
4111         unsigned int written;
4112         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4113         struct cifs_credits credits = { .value = 0, .instance = 0 };
4114
4115         WARN_ONCE(wdata->server != mid->server,
4116                   "wdata server %p != mid server %p",
4117                   wdata->server, mid->server);
4118
4119         switch (mid->mid_state) {
4120         case MID_RESPONSE_RECEIVED:
4121                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4122                 credits.instance = server->reconnect_instance;
4123                 wdata->result = smb2_check_receive(mid, server, 0);
4124                 if (wdata->result != 0)
4125                         break;
4126
4127                 written = le32_to_cpu(rsp->DataLength);
4128                 /*
4129                  * Mask off high 16 bits when bytes written as returned
4130                  * by the server is greater than bytes requested by the
4131                  * client. OS/2 servers are known to set incorrect
4132                  * CountHigh values.
4133                  */
4134                 if (written > wdata->bytes)
4135                         written &= 0xFFFF;
4136
4137                 if (written < wdata->bytes)
4138                         wdata->result = -ENOSPC;
4139                 else
4140                         wdata->bytes = written;
4141                 break;
4142         case MID_REQUEST_SUBMITTED:
4143         case MID_RETRY_NEEDED:
4144                 wdata->result = -EAGAIN;
4145                 break;
4146         case MID_RESPONSE_MALFORMED:
4147                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4148                 credits.instance = server->reconnect_instance;
4149                 fallthrough;
4150         default:
4151                 wdata->result = -EIO;
4152                 break;
4153         }
4154 #ifdef CONFIG_CIFS_SMB_DIRECT
4155         /*
4156          * If this wdata has a memory registered, the MR can be freed
4157          * The number of MRs available is limited, it's important to recover
4158          * used MR as soon as I/O is finished. Hold MR longer in the later
4159          * I/O process can possibly result in I/O deadlock due to lack of MR
4160          * to send request on I/O retry
4161          */
4162         if (wdata->mr) {
4163                 smbd_deregister_mr(wdata->mr);
4164                 wdata->mr = NULL;
4165         }
4166 #endif
4167         if (wdata->result) {
4168                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4169                 trace_smb3_write_err(0 /* no xid */,
4170                                      wdata->cfile->fid.persistent_fid,
4171                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4172                                      wdata->bytes, wdata->result);
4173                 if (wdata->result == -ENOSPC)
4174                         pr_warn_once("Out of space writing to %s\n",
4175                                      tcon->treeName);
4176         } else
4177                 trace_smb3_write_done(0 /* no xid */,
4178                                       wdata->cfile->fid.persistent_fid,
4179                                       tcon->tid, tcon->ses->Suid,
4180                                       wdata->offset, wdata->bytes);
4181
4182         queue_work(cifsiod_wq, &wdata->work);
4183         DeleteMidQEntry(mid);
4184         add_credits(server, &credits, 0);
4185 }
4186
4187 /* smb2_async_writev - send an async write, and set up mid to handle result */
4188 int
4189 smb2_async_writev(struct cifs_writedata *wdata,
4190                   void (*release)(struct kref *kref))
4191 {
4192         int rc = -EACCES, flags = 0;
4193         struct smb2_write_req *req = NULL;
4194         struct smb2_sync_hdr *shdr;
4195         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4196         struct TCP_Server_Info *server = wdata->server;
4197         struct kvec iov[1];
4198         struct smb_rqst rqst = { };
4199         unsigned int total_len;
4200
4201         if (!wdata->server)
4202                 server = wdata->server = cifs_pick_channel(tcon->ses);
4203
4204         rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4205                                  (void **) &req, &total_len);
4206         if (rc)
4207                 return rc;
4208
4209         if (smb3_encryption_required(tcon))
4210                 flags |= CIFS_TRANSFORM_REQ;
4211
4212         shdr = (struct smb2_sync_hdr *)req;
4213         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
4214
4215         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
4216         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
4217         req->WriteChannelInfoOffset = 0;
4218         req->WriteChannelInfoLength = 0;
4219         req->Channel = 0;
4220         req->Offset = cpu_to_le64(wdata->offset);
4221         req->DataOffset = cpu_to_le16(
4222                                 offsetof(struct smb2_write_req, Buffer));
4223         req->RemainingBytes = 0;
4224
4225         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
4226                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
4227 #ifdef CONFIG_CIFS_SMB_DIRECT
4228         /*
4229          * If we want to do a server RDMA read, fill in and append
4230          * smbd_buffer_descriptor_v1 to the end of write request
4231          */
4232         if (server->rdma && !server->sign && wdata->bytes >=
4233                 server->smbd_conn->rdma_readwrite_threshold) {
4234
4235                 struct smbd_buffer_descriptor_v1 *v1;
4236                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4237
4238                 wdata->mr = smbd_register_mr(
4239                                 server->smbd_conn, wdata->pages,
4240                                 wdata->nr_pages, wdata->page_offset,
4241                                 wdata->tailsz, false, need_invalidate);
4242                 if (!wdata->mr) {
4243                         rc = -EAGAIN;
4244                         goto async_writev_out;
4245                 }
4246                 req->Length = 0;
4247                 req->DataOffset = 0;
4248                 if (wdata->nr_pages > 1)
4249                         req->RemainingBytes =
4250                                 cpu_to_le32(
4251                                         (wdata->nr_pages - 1) * wdata->pagesz -
4252                                         wdata->page_offset + wdata->tailsz
4253                                 );
4254                 else
4255                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
4256                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4257                 if (need_invalidate)
4258                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4259                 req->WriteChannelInfoOffset =
4260                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4261                 req->WriteChannelInfoLength =
4262                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4263                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4264                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4265                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4266                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4267         }
4268 #endif
4269         iov[0].iov_len = total_len - 1;
4270         iov[0].iov_base = (char *)req;
4271
4272         rqst.rq_iov = iov;
4273         rqst.rq_nvec = 1;
4274         rqst.rq_pages = wdata->pages;
4275         rqst.rq_offset = wdata->page_offset;
4276         rqst.rq_npages = wdata->nr_pages;
4277         rqst.rq_pagesz = wdata->pagesz;
4278         rqst.rq_tailsz = wdata->tailsz;
4279 #ifdef CONFIG_CIFS_SMB_DIRECT
4280         if (wdata->mr) {
4281                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4282                 rqst.rq_npages = 0;
4283         }
4284 #endif
4285         cifs_dbg(FYI, "async write at %llu %u bytes\n",
4286                  wdata->offset, wdata->bytes);
4287
4288 #ifdef CONFIG_CIFS_SMB_DIRECT
4289         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4290         if (!wdata->mr)
4291                 req->Length = cpu_to_le32(wdata->bytes);
4292 #else
4293         req->Length = cpu_to_le32(wdata->bytes);
4294 #endif
4295
4296         if (wdata->credits.value > 0) {
4297                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4298                                                     SMB2_MAX_BUFFER_SIZE));
4299                 shdr->CreditRequest =
4300                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
4301
4302                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4303                 if (rc)
4304                         goto async_writev_out;
4305
4306                 flags |= CIFS_HAS_CREDITS;
4307         }
4308
4309         kref_get(&wdata->refcount);
4310         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4311                              wdata, flags, &wdata->credits);
4312
4313         if (rc) {
4314                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
4315                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4316                                      wdata->bytes, rc);
4317                 kref_put(&wdata->refcount, release);
4318                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4319         }
4320
4321 async_writev_out:
4322         cifs_small_buf_release(req);
4323         return rc;
4324 }
4325
4326 /*
4327  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4328  * The length field from io_parms must be at least 1 and indicates a number of
4329  * elements with data to write that begins with position 1 in iov array. All
4330  * data length is specified by count.
4331  */
4332 int
4333 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4334            unsigned int *nbytes, struct kvec *iov, int n_vec)
4335 {
4336         struct smb_rqst rqst;
4337         int rc = 0;
4338         struct smb2_write_req *req = NULL;
4339         struct smb2_write_rsp *rsp = NULL;
4340         int resp_buftype;
4341         struct kvec rsp_iov;
4342         int flags = 0;
4343         unsigned int total_len;
4344         struct TCP_Server_Info *server;
4345
4346         *nbytes = 0;
4347
4348         if (n_vec < 1)
4349                 return rc;
4350
4351         if (!io_parms->server)
4352                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4353         server = io_parms->server;
4354         if (server == NULL)
4355                 return -ECONNABORTED;
4356
4357         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
4358                                  (void **) &req, &total_len);
4359         if (rc)
4360                 return rc;
4361
4362         if (smb3_encryption_required(io_parms->tcon))
4363                 flags |= CIFS_TRANSFORM_REQ;
4364
4365         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
4366
4367         req->PersistentFileId = io_parms->persistent_fid;
4368         req->VolatileFileId = io_parms->volatile_fid;
4369         req->WriteChannelInfoOffset = 0;
4370         req->WriteChannelInfoLength = 0;
4371         req->Channel = 0;
4372         req->Length = cpu_to_le32(io_parms->length);
4373         req->Offset = cpu_to_le64(io_parms->offset);
4374         req->DataOffset = cpu_to_le16(
4375                                 offsetof(struct smb2_write_req, Buffer));
4376         req->RemainingBytes = 0;
4377
4378         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4379                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4380                 io_parms->offset, io_parms->length);
4381
4382         iov[0].iov_base = (char *)req;
4383         /* 1 for Buffer */
4384         iov[0].iov_len = total_len - 1;
4385
4386         memset(&rqst, 0, sizeof(struct smb_rqst));
4387         rqst.rq_iov = iov;
4388         rqst.rq_nvec = n_vec + 1;
4389
4390         rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
4391                             &rqst,
4392                             &resp_buftype, flags, &rsp_iov);
4393         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4394
4395         if (rc) {
4396                 trace_smb3_write_err(xid, req->PersistentFileId,
4397                                      io_parms->tcon->tid,
4398                                      io_parms->tcon->ses->Suid,
4399                                      io_parms->offset, io_parms->length, rc);
4400                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4401                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4402         } else {
4403                 *nbytes = le32_to_cpu(rsp->DataLength);
4404                 trace_smb3_write_done(xid, req->PersistentFileId,
4405                                      io_parms->tcon->tid,
4406                                      io_parms->tcon->ses->Suid,
4407                                      io_parms->offset, *nbytes);
4408         }
4409
4410         cifs_small_buf_release(req);
4411         free_rsp_buf(resp_buftype, rsp);
4412         return rc;
4413 }
4414
4415 int posix_info_sid_size(const void *beg, const void *end)
4416 {
4417         size_t subauth;
4418         int total;
4419
4420         if (beg + 1 > end)
4421                 return -1;
4422
4423         subauth = *(u8 *)(beg+1);
4424         if (subauth < 1 || subauth > 15)
4425                 return -1;
4426
4427         total = 1 + 1 + 6 + 4*subauth;
4428         if (beg + total > end)
4429                 return -1;
4430
4431         return total;
4432 }
4433
4434 int posix_info_parse(const void *beg, const void *end,
4435                      struct smb2_posix_info_parsed *out)
4436
4437 {
4438         int total_len = 0;
4439         int sid_len;
4440         int name_len;
4441         const void *owner_sid;
4442         const void *group_sid;
4443         const void *name;
4444
4445         /* if no end bound given, assume payload to be correct */
4446         if (!end) {
4447                 const struct smb2_posix_info *p = beg;
4448
4449                 end = beg + le32_to_cpu(p->NextEntryOffset);
4450                 /* last element will have a 0 offset, pick a sensible bound */
4451                 if (end == beg)
4452                         end += 0xFFFF;
4453         }
4454
4455         /* check base buf */
4456         if (beg + sizeof(struct smb2_posix_info) > end)
4457                 return -1;
4458         total_len = sizeof(struct smb2_posix_info);
4459
4460         /* check owner sid */
4461         owner_sid = beg + total_len;
4462         sid_len = posix_info_sid_size(owner_sid, end);
4463         if (sid_len < 0)
4464                 return -1;
4465         total_len += sid_len;
4466
4467         /* check group sid */
4468         group_sid = beg + total_len;
4469         sid_len = posix_info_sid_size(group_sid, end);
4470         if (sid_len < 0)
4471                 return -1;
4472         total_len += sid_len;
4473
4474         /* check name len */
4475         if (beg + total_len + 4 > end)
4476                 return -1;
4477         name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
4478         if (name_len < 1 || name_len > 0xFFFF)
4479                 return -1;
4480         total_len += 4;
4481
4482         /* check name */
4483         name = beg + total_len;
4484         if (name + name_len > end)
4485                 return -1;
4486         total_len += name_len;
4487
4488         if (out) {
4489                 out->base = beg;
4490                 out->size = total_len;
4491                 out->name_len = name_len;
4492                 out->name = name;
4493                 memcpy(&out->owner, owner_sid,
4494                        posix_info_sid_size(owner_sid, end));
4495                 memcpy(&out->group, group_sid,
4496                        posix_info_sid_size(group_sid, end));
4497         }
4498         return total_len;
4499 }
4500
4501 static int posix_info_extra_size(const void *beg, const void *end)
4502 {
4503         int len = posix_info_parse(beg, end, NULL);
4504
4505         if (len < 0)
4506                 return -1;
4507         return len - sizeof(struct smb2_posix_info);
4508 }
4509
4510 static unsigned int
4511 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
4512             size_t size)
4513 {
4514         int len;
4515         unsigned int entrycount = 0;
4516         unsigned int next_offset = 0;
4517         char *entryptr;
4518         FILE_DIRECTORY_INFO *dir_info;
4519
4520         if (bufstart == NULL)
4521                 return 0;
4522
4523         entryptr = bufstart;
4524
4525         while (1) {
4526                 if (entryptr + next_offset < entryptr ||
4527                     entryptr + next_offset > end_of_buf ||
4528                     entryptr + next_offset + size > end_of_buf) {
4529                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4530                         break;
4531                 }
4532
4533                 entryptr = entryptr + next_offset;
4534                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4535
4536                 if (infotype == SMB_FIND_FILE_POSIX_INFO)
4537                         len = posix_info_extra_size(entryptr, end_of_buf);
4538                 else
4539                         len = le32_to_cpu(dir_info->FileNameLength);
4540
4541                 if (len < 0 ||
4542                     entryptr + len < entryptr ||
4543                     entryptr + len > end_of_buf ||
4544                     entryptr + len + size > end_of_buf) {
4545                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4546                                  end_of_buf);
4547                         break;
4548                 }
4549
4550                 *lastentry = entryptr;
4551                 entrycount++;
4552
4553                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4554                 if (!next_offset)
4555                         break;
4556         }
4557
4558         return entrycount;
4559 }
4560
4561 /*
4562  * Readdir/FindFirst
4563  */
4564 int SMB2_query_directory_init(const unsigned int xid,
4565                               struct cifs_tcon *tcon,
4566                               struct TCP_Server_Info *server,
4567                               struct smb_rqst *rqst,
4568                               u64 persistent_fid, u64 volatile_fid,
4569                               int index, int info_level)
4570 {
4571         struct smb2_query_directory_req *req;
4572         unsigned char *bufptr;
4573         __le16 asteriks = cpu_to_le16('*');
4574         unsigned int output_size = CIFSMaxBufSize -
4575                 MAX_SMB2_CREATE_RESPONSE_SIZE -
4576                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
4577         unsigned int total_len;
4578         struct kvec *iov = rqst->rq_iov;
4579         int len, rc;
4580
4581         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
4582                                  (void **) &req, &total_len);
4583         if (rc)
4584                 return rc;
4585
4586         switch (info_level) {
4587         case SMB_FIND_FILE_DIRECTORY_INFO:
4588                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4589                 break;
4590         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4591                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4592                 break;
4593         case SMB_FIND_FILE_POSIX_INFO:
4594                 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
4595                 break;
4596         default:
4597                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4598                         info_level);
4599                 return -EINVAL;
4600         }
4601
4602         req->FileIndex = cpu_to_le32(index);
4603         req->PersistentFileId = persistent_fid;
4604         req->VolatileFileId = volatile_fid;
4605
4606         len = 0x2;
4607         bufptr = req->Buffer;
4608         memcpy(bufptr, &asteriks, len);
4609
4610         req->FileNameOffset =
4611                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4612         req->FileNameLength = cpu_to_le16(len);
4613         /*
4614          * BB could be 30 bytes or so longer if we used SMB2 specific
4615          * buffer lengths, but this is safe and close enough.
4616          */
4617         output_size = min_t(unsigned int, output_size, server->maxBuf);
4618         output_size = min_t(unsigned int, output_size, 2 << 15);
4619         req->OutputBufferLength = cpu_to_le32(output_size);
4620
4621         iov[0].iov_base = (char *)req;
4622         /* 1 for Buffer */
4623         iov[0].iov_len = total_len - 1;
4624
4625         iov[1].iov_base = (char *)(req->Buffer);
4626         iov[1].iov_len = len;
4627
4628         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4629                         tcon->ses->Suid, index, output_size);
4630
4631         return 0;
4632 }
4633
4634 void SMB2_query_directory_free(struct smb_rqst *rqst)
4635 {
4636         if (rqst && rqst->rq_iov) {
4637                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4638         }
4639 }
4640
4641 int
4642 smb2_parse_query_directory(struct cifs_tcon *tcon,
4643                            struct kvec *rsp_iov,
4644                            int resp_buftype,
4645                            struct cifs_search_info *srch_inf)
4646 {
4647         struct smb2_query_directory_rsp *rsp;
4648         size_t info_buf_size;
4649         char *end_of_smb;
4650         int rc;
4651
4652         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4653
4654         switch (srch_inf->info_level) {
4655         case SMB_FIND_FILE_DIRECTORY_INFO:
4656                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4657                 break;
4658         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4659                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4660                 break;
4661         case SMB_FIND_FILE_POSIX_INFO:
4662                 /* note that posix payload are variable size */
4663                 info_buf_size = sizeof(struct smb2_posix_info);
4664                 break;
4665         default:
4666                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4667                          srch_inf->info_level);
4668                 return -EINVAL;
4669         }
4670
4671         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4672                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4673                                info_buf_size);
4674         if (rc) {
4675                 cifs_tcon_dbg(VFS, "bad info payload");
4676                 return rc;
4677         }
4678
4679         srch_inf->unicode = true;
4680
4681         if (srch_inf->ntwrk_buf_start) {
4682                 if (srch_inf->smallBuf)
4683                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4684                 else
4685                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4686         }
4687         srch_inf->ntwrk_buf_start = (char *)rsp;
4688         srch_inf->srch_entries_start = srch_inf->last_entry =
4689                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4690         end_of_smb = rsp_iov->iov_len + (char *)rsp;
4691
4692         srch_inf->entries_in_buffer = num_entries(
4693                 srch_inf->info_level,
4694                 srch_inf->srch_entries_start,
4695                 end_of_smb,
4696                 &srch_inf->last_entry,
4697                 info_buf_size);
4698
4699         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4700         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4701                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4702                  srch_inf->srch_entries_start, srch_inf->last_entry);
4703         if (resp_buftype == CIFS_LARGE_BUFFER)
4704                 srch_inf->smallBuf = false;
4705         else if (resp_buftype == CIFS_SMALL_BUFFER)
4706                 srch_inf->smallBuf = true;
4707         else
4708                 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
4709
4710         return 0;
4711 }
4712
4713 int
4714 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4715                      u64 persistent_fid, u64 volatile_fid, int index,
4716                      struct cifs_search_info *srch_inf)
4717 {
4718         struct smb_rqst rqst;
4719         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
4720         struct smb2_query_directory_rsp *rsp = NULL;
4721         int resp_buftype = CIFS_NO_BUFFER;
4722         struct kvec rsp_iov;
4723         int rc = 0;
4724         struct cifs_ses *ses = tcon->ses;
4725         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4726         int flags = 0;
4727
4728         if (!ses || !(ses->server))
4729                 return -EIO;
4730
4731         if (smb3_encryption_required(tcon))
4732                 flags |= CIFS_TRANSFORM_REQ;
4733
4734         memset(&rqst, 0, sizeof(struct smb_rqst));
4735         memset(&iov, 0, sizeof(iov));
4736         rqst.rq_iov = iov;
4737         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
4738
4739         rc = SMB2_query_directory_init(xid, tcon, server,
4740                                        &rqst, persistent_fid,
4741                                        volatile_fid, index,
4742                                        srch_inf->info_level);
4743         if (rc)
4744                 goto qdir_exit;
4745
4746         rc = cifs_send_recv(xid, ses, server,
4747                             &rqst, &resp_buftype, flags, &rsp_iov);
4748         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4749
4750         if (rc) {
4751                 if (rc == -ENODATA &&
4752                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4753                         trace_smb3_query_dir_done(xid, persistent_fid,
4754                                 tcon->tid, tcon->ses->Suid, index, 0);
4755                         srch_inf->endOfSearch = true;
4756                         rc = 0;
4757                 } else {
4758                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4759                                 tcon->ses->Suid, index, 0, rc);
4760                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4761                 }
4762                 goto qdir_exit;
4763         }
4764
4765         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
4766                                         srch_inf);
4767         if (rc) {
4768                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4769                         tcon->ses->Suid, index, 0, rc);
4770                 goto qdir_exit;
4771         }
4772         resp_buftype = CIFS_NO_BUFFER;
4773
4774         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4775                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4776
4777 qdir_exit:
4778         SMB2_query_directory_free(&rqst);
4779         free_rsp_buf(resp_buftype, rsp);
4780         return rc;
4781 }
4782
4783 int
4784 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4785                    struct smb_rqst *rqst,
4786                    u64 persistent_fid, u64 volatile_fid, u32 pid,
4787                    u8 info_class, u8 info_type, u32 additional_info,
4788                    void **data, unsigned int *size)
4789 {
4790         struct smb2_set_info_req *req;
4791         struct kvec *iov = rqst->rq_iov;
4792         unsigned int i, total_len;
4793         int rc;
4794
4795         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
4796                                  (void **) &req, &total_len);
4797         if (rc)
4798                 return rc;
4799
4800         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4801         req->InfoType = info_type;
4802         req->FileInfoClass = info_class;
4803         req->PersistentFileId = persistent_fid;
4804         req->VolatileFileId = volatile_fid;
4805         req->AdditionalInformation = cpu_to_le32(additional_info);
4806
4807         req->BufferOffset =
4808                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4809         req->BufferLength = cpu_to_le32(*size);
4810
4811         memcpy(req->Buffer, *data, *size);
4812         total_len += *size;
4813
4814         iov[0].iov_base = (char *)req;
4815         /* 1 for Buffer */
4816         iov[0].iov_len = total_len - 1;
4817
4818         for (i = 1; i < rqst->rq_nvec; i++) {
4819                 le32_add_cpu(&req->BufferLength, size[i]);
4820                 iov[i].iov_base = (char *)data[i];
4821                 iov[i].iov_len = size[i];
4822         }
4823
4824         return 0;
4825 }
4826
4827 void
4828 SMB2_set_info_free(struct smb_rqst *rqst)
4829 {
4830         if (rqst && rqst->rq_iov)
4831                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4832 }
4833
4834 static int
4835 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4836                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4837                u8 info_type, u32 additional_info, unsigned int num,
4838                 void **data, unsigned int *size)
4839 {
4840         struct smb_rqst rqst;
4841         struct smb2_set_info_rsp *rsp = NULL;
4842         struct kvec *iov;
4843         struct kvec rsp_iov;
4844         int rc = 0;
4845         int resp_buftype;
4846         struct cifs_ses *ses = tcon->ses;
4847         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4848         int flags = 0;
4849
4850         if (!ses || !server)
4851                 return -EIO;
4852
4853         if (!num)
4854                 return -EINVAL;
4855
4856         if (smb3_encryption_required(tcon))
4857                 flags |= CIFS_TRANSFORM_REQ;
4858
4859         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4860         if (!iov)
4861                 return -ENOMEM;
4862
4863         memset(&rqst, 0, sizeof(struct smb_rqst));
4864         rqst.rq_iov = iov;
4865         rqst.rq_nvec = num;
4866
4867         rc = SMB2_set_info_init(tcon, server,
4868                                 &rqst, persistent_fid, volatile_fid, pid,
4869                                 info_class, info_type, additional_info,
4870                                 data, size);
4871         if (rc) {
4872                 kfree(iov);
4873                 return rc;
4874         }
4875
4876
4877         rc = cifs_send_recv(xid, ses, server,
4878                             &rqst, &resp_buftype, flags,
4879                             &rsp_iov);
4880         SMB2_set_info_free(&rqst);
4881         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4882
4883         if (rc != 0) {
4884                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4885                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4886                                 ses->Suid, info_class, (__u32)info_type, rc);
4887         }
4888
4889         free_rsp_buf(resp_buftype, rsp);
4890         kfree(iov);
4891         return rc;
4892 }
4893
4894 int
4895 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4896              u64 volatile_fid, u32 pid, __le64 *eof)
4897 {
4898         struct smb2_file_eof_info info;
4899         void *data;
4900         unsigned int size;
4901
4902         info.EndOfFile = *eof;
4903
4904         data = &info;
4905         size = sizeof(struct smb2_file_eof_info);
4906
4907         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4908                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4909                         0, 1, &data, &size);
4910 }
4911
4912 int
4913 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4914                 u64 persistent_fid, u64 volatile_fid,
4915                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4916 {
4917         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4918                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4919                         1, (void **)&pnntsd, &pacllen);
4920 }
4921
4922 int
4923 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4924             u64 persistent_fid, u64 volatile_fid,
4925             struct smb2_file_full_ea_info *buf, int len)
4926 {
4927         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4928                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4929                 0, 1, (void **)&buf, &len);
4930 }
4931
4932 int
4933 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4934                   const u64 persistent_fid, const u64 volatile_fid,
4935                   __u8 oplock_level)
4936 {
4937         struct smb_rqst rqst;
4938         int rc;
4939         struct smb2_oplock_break *req = NULL;
4940         struct cifs_ses *ses = tcon->ses;
4941         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4942         int flags = CIFS_OBREAK_OP;
4943         unsigned int total_len;
4944         struct kvec iov[1];
4945         struct kvec rsp_iov;
4946         int resp_buf_type;
4947
4948         cifs_dbg(FYI, "SMB2_oplock_break\n");
4949         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
4950                                  (void **) &req, &total_len);
4951         if (rc)
4952                 return rc;
4953
4954         if (smb3_encryption_required(tcon))
4955                 flags |= CIFS_TRANSFORM_REQ;
4956
4957         req->VolatileFid = volatile_fid;
4958         req->PersistentFid = persistent_fid;
4959         req->OplockLevel = oplock_level;
4960         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4961
4962         flags |= CIFS_NO_RSP_BUF;
4963
4964         iov[0].iov_base = (char *)req;
4965         iov[0].iov_len = total_len;
4966
4967         memset(&rqst, 0, sizeof(struct smb_rqst));
4968         rqst.rq_iov = iov;
4969         rqst.rq_nvec = 1;
4970
4971         rc = cifs_send_recv(xid, ses, server,
4972                             &rqst, &resp_buf_type, flags, &rsp_iov);
4973         cifs_small_buf_release(req);
4974
4975         if (rc) {
4976                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4977                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
4978         }
4979
4980         return rc;
4981 }
4982
4983 void
4984 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
4985                              struct kstatfs *kst)
4986 {
4987         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
4988                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
4989         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
4990         kst->f_bfree  = kst->f_bavail =
4991                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
4992         return;
4993 }
4994
4995 static void
4996 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
4997                         struct kstatfs *kst)
4998 {
4999         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5000         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5001         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5002         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5003                 kst->f_bavail = kst->f_bfree;
5004         else
5005                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5006         if (response_data->TotalFileNodes != cpu_to_le64(-1))
5007                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5008         if (response_data->FreeFileNodes != cpu_to_le64(-1))
5009                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5010
5011         return;
5012 }
5013
5014 static int
5015 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5016                    struct TCP_Server_Info *server,
5017                    int level, int outbuf_len, u64 persistent_fid,
5018                    u64 volatile_fid)
5019 {
5020         int rc;
5021         struct smb2_query_info_req *req;
5022         unsigned int total_len;
5023
5024         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5025
5026         if ((tcon->ses == NULL) || server == NULL)
5027                 return -EIO;
5028
5029         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5030                                  (void **) &req, &total_len);
5031         if (rc)
5032                 return rc;
5033
5034         req->InfoType = SMB2_O_INFO_FILESYSTEM;
5035         req->FileInfoClass = level;
5036         req->PersistentFileId = persistent_fid;
5037         req->VolatileFileId = volatile_fid;
5038         /* 1 for pad */
5039         req->InputBufferOffset =
5040                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
5041         req->OutputBufferLength = cpu_to_le32(
5042                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
5043
5044         iov->iov_base = (char *)req;
5045         iov->iov_len = total_len;
5046         return 0;
5047 }
5048
5049 int
5050 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5051               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5052 {
5053         struct smb_rqst rqst;
5054         struct smb2_query_info_rsp *rsp = NULL;
5055         struct kvec iov;
5056         struct kvec rsp_iov;
5057         int rc = 0;
5058         int resp_buftype;
5059         struct cifs_ses *ses = tcon->ses;
5060         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5061         FILE_SYSTEM_POSIX_INFO *info = NULL;
5062         int flags = 0;
5063
5064         rc = build_qfs_info_req(&iov, tcon, server,
5065                                 FS_POSIX_INFORMATION,
5066                                 sizeof(FILE_SYSTEM_POSIX_INFO),
5067                                 persistent_fid, volatile_fid);
5068         if (rc)
5069                 return rc;
5070
5071         if (smb3_encryption_required(tcon))
5072                 flags |= CIFS_TRANSFORM_REQ;
5073
5074         memset(&rqst, 0, sizeof(struct smb_rqst));
5075         rqst.rq_iov = &iov;
5076         rqst.rq_nvec = 1;
5077
5078         rc = cifs_send_recv(xid, ses, server,
5079                             &rqst, &resp_buftype, flags, &rsp_iov);
5080         cifs_small_buf_release(iov.iov_base);
5081         if (rc) {
5082                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5083                 goto posix_qfsinf_exit;
5084         }
5085         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5086
5087         info = (FILE_SYSTEM_POSIX_INFO *)(
5088                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5089         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5090                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5091                                sizeof(FILE_SYSTEM_POSIX_INFO));
5092         if (!rc)
5093                 copy_posix_fs_info_to_kstatfs(info, fsdata);
5094
5095 posix_qfsinf_exit:
5096         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5097         return rc;
5098 }
5099
5100 int
5101 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5102               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5103 {
5104         struct smb_rqst rqst;
5105         struct smb2_query_info_rsp *rsp = NULL;
5106         struct kvec iov;
5107         struct kvec rsp_iov;
5108         int rc = 0;
5109         int resp_buftype;
5110         struct cifs_ses *ses = tcon->ses;
5111         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5112         struct smb2_fs_full_size_info *info = NULL;
5113         int flags = 0;
5114
5115         rc = build_qfs_info_req(&iov, tcon, server,
5116                                 FS_FULL_SIZE_INFORMATION,
5117                                 sizeof(struct smb2_fs_full_size_info),
5118                                 persistent_fid, volatile_fid);
5119         if (rc)
5120                 return rc;
5121
5122         if (smb3_encryption_required(tcon))
5123                 flags |= CIFS_TRANSFORM_REQ;
5124
5125         memset(&rqst, 0, sizeof(struct smb_rqst));
5126         rqst.rq_iov = &iov;
5127         rqst.rq_nvec = 1;
5128
5129         rc = cifs_send_recv(xid, ses, server,
5130                             &rqst, &resp_buftype, flags, &rsp_iov);
5131         cifs_small_buf_release(iov.iov_base);
5132         if (rc) {
5133                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5134                 goto qfsinf_exit;
5135         }
5136         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5137
5138         info = (struct smb2_fs_full_size_info *)(
5139                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5140         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5141                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5142                                sizeof(struct smb2_fs_full_size_info));
5143         if (!rc)
5144                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5145
5146 qfsinf_exit:
5147         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5148         return rc;
5149 }
5150
5151 int
5152 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5153               u64 persistent_fid, u64 volatile_fid, int level)
5154 {
5155         struct smb_rqst rqst;
5156         struct smb2_query_info_rsp *rsp = NULL;
5157         struct kvec iov;
5158         struct kvec rsp_iov;
5159         int rc = 0;
5160         int resp_buftype, max_len, min_len;
5161         struct cifs_ses *ses = tcon->ses;
5162         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5163         unsigned int rsp_len, offset;
5164         int flags = 0;
5165
5166         if (level == FS_DEVICE_INFORMATION) {
5167                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5168                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5169         } else if (level == FS_ATTRIBUTE_INFORMATION) {
5170                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5171                 min_len = MIN_FS_ATTR_INFO_SIZE;
5172         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5173                 max_len = sizeof(struct smb3_fs_ss_info);
5174                 min_len = sizeof(struct smb3_fs_ss_info);
5175         } else if (level == FS_VOLUME_INFORMATION) {
5176                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5177                 min_len = sizeof(struct smb3_fs_vol_info);
5178         } else {
5179                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5180                 return -EINVAL;
5181         }
5182
5183         rc = build_qfs_info_req(&iov, tcon, server,
5184                                 level, max_len,
5185                                 persistent_fid, volatile_fid);
5186         if (rc)
5187                 return rc;
5188
5189         if (smb3_encryption_required(tcon))
5190                 flags |= CIFS_TRANSFORM_REQ;
5191
5192         memset(&rqst, 0, sizeof(struct smb_rqst));
5193         rqst.rq_iov = &iov;
5194         rqst.rq_nvec = 1;
5195
5196         rc = cifs_send_recv(xid, ses, server,
5197                             &rqst, &resp_buftype, flags, &rsp_iov);
5198         cifs_small_buf_release(iov.iov_base);
5199         if (rc) {
5200                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5201                 goto qfsattr_exit;
5202         }
5203         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5204
5205         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5206         offset = le16_to_cpu(rsp->OutputBufferOffset);
5207         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5208         if (rc)
5209                 goto qfsattr_exit;
5210
5211         if (level == FS_ATTRIBUTE_INFORMATION)
5212                 memcpy(&tcon->fsAttrInfo, offset
5213                         + (char *)rsp, min_t(unsigned int,
5214                         rsp_len, max_len));
5215         else if (level == FS_DEVICE_INFORMATION)
5216                 memcpy(&tcon->fsDevInfo, offset
5217                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5218         else if (level == FS_SECTOR_SIZE_INFORMATION) {
5219                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5220                         (offset + (char *)rsp);
5221                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5222                 tcon->perf_sector_size =
5223                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5224         } else if (level == FS_VOLUME_INFORMATION) {
5225                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5226                         (offset + (char *)rsp);
5227                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5228                 tcon->vol_create_time = vol_info->VolumeCreationTime;
5229         }
5230
5231 qfsattr_exit:
5232         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5233         return rc;
5234 }
5235
5236 int
5237 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5238            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5239            const __u32 num_lock, struct smb2_lock_element *buf)
5240 {
5241         struct smb_rqst rqst;
5242         int rc = 0;
5243         struct smb2_lock_req *req = NULL;
5244         struct kvec iov[2];
5245         struct kvec rsp_iov;
5246         int resp_buf_type;
5247         unsigned int count;
5248         int flags = CIFS_NO_RSP_BUF;
5249         unsigned int total_len;
5250         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5251
5252         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
5253
5254         rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
5255                                  (void **) &req, &total_len);
5256         if (rc)
5257                 return rc;
5258
5259         if (smb3_encryption_required(tcon))
5260                 flags |= CIFS_TRANSFORM_REQ;
5261
5262         req->sync_hdr.ProcessId = cpu_to_le32(pid);
5263         req->LockCount = cpu_to_le16(num_lock);
5264
5265         req->PersistentFileId = persist_fid;
5266         req->VolatileFileId = volatile_fid;
5267
5268         count = num_lock * sizeof(struct smb2_lock_element);
5269
5270         iov[0].iov_base = (char *)req;
5271         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
5272         iov[1].iov_base = (char *)buf;
5273         iov[1].iov_len = count;
5274
5275         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
5276
5277         memset(&rqst, 0, sizeof(struct smb_rqst));
5278         rqst.rq_iov = iov;
5279         rqst.rq_nvec = 2;
5280
5281         rc = cifs_send_recv(xid, tcon->ses, server,
5282                             &rqst, &resp_buf_type, flags,
5283                             &rsp_iov);
5284         cifs_small_buf_release(req);
5285         if (rc) {
5286                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
5287                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
5288                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
5289                                     tcon->ses->Suid, rc);
5290         }
5291
5292         return rc;
5293 }
5294
5295 int
5296 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5297           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5298           const __u64 length, const __u64 offset, const __u32 lock_flags,
5299           const bool wait)
5300 {
5301         struct smb2_lock_element lock;
5302
5303         lock.Offset = cpu_to_le64(offset);
5304         lock.Length = cpu_to_le64(length);
5305         lock.Flags = cpu_to_le32(lock_flags);
5306         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5307                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5308
5309         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5310 }
5311
5312 int
5313 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5314                  __u8 *lease_key, const __le32 lease_state)
5315 {
5316         struct smb_rqst rqst;
5317         int rc;
5318         struct smb2_lease_ack *req = NULL;
5319         struct cifs_ses *ses = tcon->ses;
5320         int flags = CIFS_OBREAK_OP;
5321         unsigned int total_len;
5322         struct kvec iov[1];
5323         struct kvec rsp_iov;
5324         int resp_buf_type;
5325         __u64 *please_key_high;
5326         __u64 *please_key_low;
5327         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5328
5329         cifs_dbg(FYI, "SMB2_lease_break\n");
5330         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5331                                  (void **) &req, &total_len);
5332         if (rc)
5333                 return rc;
5334
5335         if (smb3_encryption_required(tcon))
5336                 flags |= CIFS_TRANSFORM_REQ;
5337
5338         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5339         req->StructureSize = cpu_to_le16(36);
5340         total_len += 12;
5341
5342         memcpy(req->LeaseKey, lease_key, 16);
5343         req->LeaseState = lease_state;
5344
5345         flags |= CIFS_NO_RSP_BUF;
5346
5347         iov[0].iov_base = (char *)req;
5348         iov[0].iov_len = total_len;
5349
5350         memset(&rqst, 0, sizeof(struct smb_rqst));
5351         rqst.rq_iov = iov;
5352         rqst.rq_nvec = 1;
5353
5354         rc = cifs_send_recv(xid, ses, server,
5355                             &rqst, &resp_buf_type, flags, &rsp_iov);
5356         cifs_small_buf_release(req);
5357
5358         please_key_low = (__u64 *)lease_key;
5359         please_key_high = (__u64 *)(lease_key+8);
5360         if (rc) {
5361                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5362                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5363                         ses->Suid, *please_key_low, *please_key_high, rc);
5364                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5365         } else
5366                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5367                         ses->Suid, *please_key_low, *please_key_high);
5368
5369         return rc;
5370 }