fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/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)
  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 {
 103         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 104         shdr->StructureSize = cpu_to_le16(64);
 105         shdr->Command = smb2_cmd;
 106         if (tcon && tcon->ses && tcon->ses->server) {
 107                 struct TCP_Server_Info *server = tcon->ses->server;
 108
 109                 spin_lock(&server->req_lock);
 110                 /* Request up to 10 credits but don't go over the limit. */
 111                 if (server->credits >= server->max_credits)
 112                         shdr->CreditRequest = cpu_to_le16(0);
 113                 else
 114                         shdr->CreditRequest = cpu_to_le16(
 115                                 min_t(int, server->max_credits -
 116                                                 server->credits, 10));
 117                 spin_unlock(&server->req_lock);
 118         } else {
 119                 shdr->CreditRequest = cpu_to_le16(2);
 120         }
 121         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 122
 123         if (!tcon)
 124                 goto out;
 125
 126         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 127         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 128         if ((tcon->ses) && (tcon->ses->server) &&
 129             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 130                 shdr->CreditCharge = cpu_to_le16(1);
 131         /* else CreditCharge MBZ */
 132
 133         shdr->TreeId = tcon->tid;
 134         /* Uid is not converted */
 135         if (tcon->ses)
 136                 shdr->SessionId = tcon->ses->Suid;
 137
 138         /*
 139          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 140          * to pass the path on the Open SMB prefixed by \\server\share.
 141          * Not sure when we would need to do the augmented path (if ever) and
 142          * setting this flag breaks the SMB2 open operation since it is
 143          * illegal to send an empty path name (without \\server\share prefix)
 144          * when the DFS flag is set in the SMB open header. We could
 145          * consider setting the flag on all operations other than open
 146          * but it is safer to net set it for now.
 147          */
 148 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 149                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 150
 151         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
 152             !smb3_encryption_required(tcon))
 153                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 154 out:
 155         return;
 156 }
 157
 158 #ifdef CONFIG_CIFS_DFS_UPCALL
 159 static int __smb2_reconnect(const struct nls_table *nlsc,
 160                             struct cifs_tcon *tcon)
 161 {
 162         int rc;
 163         struct dfs_cache_tgt_list tl;
 164         struct dfs_cache_tgt_iterator *it = NULL;
 165         char *tree;
 166         const char *tcp_host;
 167         size_t tcp_host_len;
 168         const char *dfs_host;
 169         size_t dfs_host_len;
 170
 171         tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL);
 172         if (!tree)
 173                 return -ENOMEM;
 174
 175         if (tcon->ipc) {
 176                 scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$",
 177                           tcon->ses->server->hostname);
 178                 rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
 179                 goto out;
 180         }
 181
 182         if (!tcon->dfs_path) {
 183                 rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
 184                 goto out;
 185         }
 186
 187         rc = dfs_cache_noreq_find(tcon->dfs_path + 1, NULL, &tl);
 188         if (rc)
 189                 goto out;
 190
 191         extract_unc_hostname(tcon->ses->server->hostname, &tcp_host,
 192                              &tcp_host_len);
 193
 194         for (it = dfs_cache_get_tgt_iterator(&tl); it;
 195              it = dfs_cache_get_next_tgt(&tl, it)) {
 196                 const char *tgt = dfs_cache_get_tgt_name(it);
 197
 198                 extract_unc_hostname(tgt, &dfs_host, &dfs_host_len);
 199
 200                 if (dfs_host_len != tcp_host_len
 201                     || strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) {
 202                         cifs_dbg(FYI, "%s: skipping %.*s, doesn't match %.*s",
 203                                  __func__,
 204                                  (int)dfs_host_len, dfs_host,
 205                                  (int)tcp_host_len, tcp_host);
 206                         continue;
 207                 }
 208
 209                 scnprintf(tree, MAX_TREE_SIZE, "\\%s", tgt);
 210
 211                 rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
 212                 if (!rc)
 213                         break;
 214                 if (rc == -EREMOTE)
 215                         break;
 216         }
 217
 218         if (!rc) {
 219                 if (it)
 220                         rc = dfs_cache_noreq_update_tgthint(tcon->dfs_path + 1,
 221                                                             it);
 222                 else
 223                         rc = -ENOENT;
 224         }
 225         dfs_cache_free_tgts(&tl);
 226 out:
 227         kfree(tree);
 228         return rc;
 229 }
 230 #else
 231 static inline int __smb2_reconnect(const struct nls_table *nlsc,
 232                                    struct cifs_tcon *tcon)
 233 {
 234         return SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
 235 }
 236 #endif
 237
 238 static int
 239 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 240 {
 241         int rc;
 242         struct nls_table *nls_codepage;
 243         struct cifs_ses *ses;
 244         struct TCP_Server_Info *server;
 245         int retries;
 246
 247         /*
 248          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 249          * check for tcp and smb session status done differently
 250          * for those three - in the calling routine.
 251          */
 252         if (tcon == NULL)
 253                 return 0;
 254
 255         if (smb2_command == SMB2_TREE_CONNECT || smb2_command == SMB2_IOCTL)
 256                 return 0;
 257
 258         if (tcon->tidStatus == CifsExiting) {
 259                 /*
 260                  * only tree disconnect, open, and write,
 261                  * (and ulogoff which does not have tcon)
 262                  * are allowed as we start force umount.
 263                  */
 264                 if ((smb2_command != SMB2_WRITE) &&
 265                    (smb2_command != SMB2_CREATE) &&
 266                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 267                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 268                                  smb2_command);
 269                         return -ENODEV;
 270                 }
 271         }
 272         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 273             (!tcon->ses->server))
 274                 return -EIO;
 275
 276         ses = tcon->ses;
 277         server = ses->server;
 278
 279         retries = server->nr_targets;
 280
 281         /*
 282          * Give demultiplex thread up to 10 seconds to each target available for
 283          * reconnect -- should be greater than cifs socket timeout which is 7
 284          * seconds.
 285          */
 286         while (server->tcpStatus == CifsNeedReconnect) {
 287                 /*
 288                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 289                  * here since they are implicitly done when session drops.
 290                  */
 291                 switch (smb2_command) {
 292                 /*
 293                  * BB Should we keep oplock break and add flush to exceptions?
 294                  */
 295                 case SMB2_TREE_DISCONNECT:
 296                 case SMB2_CANCEL:
 297                 case SMB2_CLOSE:
 298                 case SMB2_OPLOCK_BREAK:
 299                         return -EAGAIN;
 300                 }
 301
 302                 rc = wait_event_interruptible_timeout(server->response_q,
 303                                                       (server->tcpStatus != CifsNeedReconnect),
 304                                                       10 * HZ);
 305                 if (rc < 0) {
 306                         cifs_dbg(FYI, "%s: aborting reconnect due to a received"
 307                                  " signal by the process\n", __func__);
 308                         return -ERESTARTSYS;
 309                 }
 310
 311                 /* are we still trying to reconnect? */
 312                 if (server->tcpStatus != CifsNeedReconnect)
 313                         break;
 314
 315                 if (--retries)
 316                         continue;
 317
 318                 /*
 319                  * on "soft" mounts we wait once. Hard mounts keep
 320                  * retrying until process is killed or server comes
 321                  * back on-line
 322                  */
 323                 if (!tcon->retry) {
 324                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 325                         return -EHOSTDOWN;
 326                 }
 327                 retries = server->nr_targets;
 328         }
 329
 330         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 331                 return 0;
 332
 333         nls_codepage = load_nls_default();
 334
 335         /*
 336          * need to prevent multiple threads trying to simultaneously reconnect
 337          * the same SMB session
 338          */
 339         mutex_lock(&tcon->ses->session_mutex);
 340
 341         /*
 342          * Recheck after acquire mutex. If another thread is negotiating
 343          * and the server never sends an answer the socket will be closed
 344          * and tcpStatus set to reconnect.
 345          */
 346         if (server->tcpStatus == CifsNeedReconnect) {
 347                 rc = -EHOSTDOWN;
 348                 mutex_unlock(&tcon->ses->session_mutex);
 349                 goto out;
 350         }
 351
 352         rc = cifs_negotiate_protocol(0, tcon->ses);
 353         if (!rc && tcon->ses->need_reconnect)
 354                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 355
 356         if (rc || !tcon->need_reconnect) {
 357                 mutex_unlock(&tcon->ses->session_mutex);
 358                 goto out;
 359         }
 360
 361         cifs_mark_open_files_invalid(tcon);
 362         if (tcon->use_persistent)
 363                 tcon->need_reopen_files = true;
 364
 365         rc = __smb2_reconnect(nls_codepage, tcon);
 366         mutex_unlock(&tcon->ses->session_mutex);
 367
 368         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 369         if (rc) {
 370                 /* If sess reconnected but tcon didn't, something strange ... */
 371                 printk_once(KERN_WARNING "reconnect tcon failed rc = %d\n", rc);
 372                 goto out;
 373         }
 374
 375         if (smb2_command != SMB2_INTERNAL_CMD)
 376                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
 377
 378         atomic_inc(&tconInfoReconnectCount);
 379 out:
 380         /*
 381          * Check if handle based operation so we know whether we can continue
 382          * or not without returning to caller to reset file handle.
 383          */
 384         /*
 385          * BB Is flush done by server on drop of tcp session? Should we special
 386          * case it and skip above?
 387          */
 388         switch (smb2_command) {
 389         case SMB2_FLUSH:
 390         case SMB2_READ:
 391         case SMB2_WRITE:
 392         case SMB2_LOCK:
 393         case SMB2_IOCTL:
 394         case SMB2_QUERY_DIRECTORY:
 395         case SMB2_CHANGE_NOTIFY:
 396         case SMB2_QUERY_INFO:
 397         case SMB2_SET_INFO:
 398                 rc = -EAGAIN;
 399         }
 400         unload_nls(nls_codepage);
 401         return rc;
 402 }
 403
 404 static void
 405 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
 406                unsigned int *total_len)
 407 {
 408         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 409         /* lookup word count ie StructureSize from table */
 410         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 411
 412         /*
 413          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 414          * largest operations (Create)
 415          */
 416         memset(buf, 0, 256);
 417
 418         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
 419         spdu->StructureSize2 = cpu_to_le16(parmsize);
 420
 421         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 422 }
 423
 424 /*
 425  * Allocate and return pointer to an SMB request hdr, and set basic
 426  * SMB information in the SMB header. If the return code is zero, this
 427  * function must have filled in request_buf pointer.
 428  */
 429 static int
 430 smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 431                     void **request_buf, unsigned int *total_len)
 432 {
 433         int rc;
 434
 435         rc = smb2_reconnect(smb2_command, tcon);
 436         if (rc)
 437                 return rc;
 438
 439         /* BB eventually switch this to SMB2 specific small buf size */
 440         if (smb2_command == SMB2_SET_INFO)
 441                 *request_buf = cifs_buf_get();
 442         else
 443                 *request_buf = cifs_small_buf_get();
 444         if (*request_buf == NULL) {
 445                 /* BB should we add a retry in here if not a writepage? */
 446                 return -ENOMEM;
 447         }
 448
 449         fill_small_buf(smb2_command, tcon,
 450                        (struct smb2_sync_hdr *)(*request_buf),
 451                        total_len);
 452
 453         if (tcon != NULL) {
 454                 uint16_t com_code = le16_to_cpu(smb2_command);
 455                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 456                 cifs_stats_inc(&tcon->num_smbs_sent);
 457         }
 458
 459         return rc;
 460 }
 461
 462 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 463
 464 static void
 465 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 466 {
 467         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 468         pneg_ctxt->DataLength = cpu_to_le16(38);
 469         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 470         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 471         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 472         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 473 }
 474
 475 static void
 476 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 477 {
 478         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 479         pneg_ctxt->DataLength =
 480                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 481                           - sizeof(struct smb2_neg_context));
 482         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 483         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 484         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 485         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 486 }
 487
 488 static void
 489 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 490 {
 491         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 492         pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + two ciphers */
 493         pneg_ctxt->CipherCount = cpu_to_le16(2);
 494         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 495         pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 496 }
 497
 498 static unsigned int
 499 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 500 {
 501         struct nls_table *cp = load_nls_default();
 502
 503         pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 504
 505         /* copy up to max of first 100 bytes of server name to NetName field */
 506         pneg_ctxt->DataLength = cpu_to_le16(2 +
 507                 (2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp)));
 508         /* context size is DataLength + minimal smb2_neg_context */
 509         return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
 510                         sizeof(struct smb2_neg_context), 8) * 8;
 511 }
 512
 513 static void
 514 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 515 {
 516         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 517         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 518         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 519         pneg_ctxt->Name[0] = 0x93;
 520         pneg_ctxt->Name[1] = 0xAD;
 521         pneg_ctxt->Name[2] = 0x25;
 522         pneg_ctxt->Name[3] = 0x50;
 523         pneg_ctxt->Name[4] = 0x9C;
 524         pneg_ctxt->Name[5] = 0xB4;
 525         pneg_ctxt->Name[6] = 0x11;
 526         pneg_ctxt->Name[7] = 0xE7;
 527         pneg_ctxt->Name[8] = 0xB4;
 528         pneg_ctxt->Name[9] = 0x23;
 529         pneg_ctxt->Name[10] = 0x83;
 530         pneg_ctxt->Name[11] = 0xDE;
 531         pneg_ctxt->Name[12] = 0x96;
 532         pneg_ctxt->Name[13] = 0x8B;
 533         pneg_ctxt->Name[14] = 0xCD;
 534         pneg_ctxt->Name[15] = 0x7C;
 535 }
 536
 537 static void
 538 assemble_neg_contexts(struct smb2_negotiate_req *req,
 539                       struct TCP_Server_Info *server, unsigned int *total_len)
 540 {
 541         char *pneg_ctxt = (char *)req;
 542         unsigned int ctxt_len;
 543
 544         if (*total_len > 200) {
 545                 /* In case length corrupted don't want to overrun smb buffer */
 546                 cifs_dbg(VFS, "Bad frame length assembling neg contexts\n");
 547                 return;
 548         }
 549
 550         /*
 551          * round up total_len of fixed part of SMB3 negotiate request to 8
 552          * byte boundary before adding negotiate contexts
 553          */
 554         *total_len = roundup(*total_len, 8);
 555
 556         pneg_ctxt = (*total_len) + (char *)req;
 557         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 558
 559         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 560         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 561         *total_len += ctxt_len;
 562         pneg_ctxt += ctxt_len;
 563
 564         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 565         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 566         *total_len += ctxt_len;
 567         pneg_ctxt += ctxt_len;
 568
 569         if (server->compress_algorithm) {
 570                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 571                                 pneg_ctxt);
 572                 ctxt_len = DIV_ROUND_UP(
 573                         sizeof(struct smb2_compression_capabilities_context),
 574                                 8) * 8;
 575                 *total_len += ctxt_len;
 576                 pneg_ctxt += ctxt_len;
 577                 req->NegotiateContextCount = cpu_to_le16(5);
 578         } else
 579                 req->NegotiateContextCount = cpu_to_le16(4);
 580
 581         ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 582                                         server->hostname);
 583         *total_len += ctxt_len;
 584         pneg_ctxt += ctxt_len;
 585
 586         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 587         *total_len += sizeof(struct smb2_posix_neg_context);
 588 }
 589
 590 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 591 {
 592         unsigned int len = le16_to_cpu(ctxt->DataLength);
 593
 594         /* If invalid preauth context warn but use what we requested, SHA-512 */
 595         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 596                 printk_once(KERN_WARNING "server sent bad preauth context\n");
 597                 return;
 598         }
 599         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 600                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
 601         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 602                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
 603 }
 604
 605 static void decode_compress_ctx(struct TCP_Server_Info *server,
 606                          struct smb2_compression_capabilities_context *ctxt)
 607 {
 608         unsigned int len = le16_to_cpu(ctxt->DataLength);
 609
 610         /* sizeof compress context is a one element compression capbility struct */
 611         if (len < 10) {
 612                 printk_once(KERN_WARNING "server sent bad compression cntxt\n");
 613                 return;
 614         }
 615         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 616                 printk_once(KERN_WARNING "illegal SMB3 compress algorithm count\n");
 617                 return;
 618         }
 619         if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 620                 printk_once(KERN_WARNING "unknown compression algorithm\n");
 621                 return;
 622         }
 623         server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 624 }
 625
 626 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 627                               struct smb2_encryption_neg_context *ctxt)
 628 {
 629         unsigned int len = le16_to_cpu(ctxt->DataLength);
 630
 631         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 632         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 633                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
 634                 return -EINVAL;
 635         }
 636
 637         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 638                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
 639                 return -EINVAL;
 640         }
 641         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 642         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 643             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 644                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
 645                 return -EINVAL;
 646         }
 647         server->cipher_type = ctxt->Ciphers[0];
 648         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 649         return 0;
 650 }
 651
 652 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 653                                      struct TCP_Server_Info *server,
 654                                      unsigned int len_of_smb)
 655 {
 656         struct smb2_neg_context *pctx;
 657         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 658         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 659         unsigned int len_of_ctxts, i;
 660         int rc = 0;
 661
 662         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 663         if (len_of_smb <= offset) {
 664                 cifs_dbg(VFS, "Invalid response: negotiate context offset\n");
 665                 return -EINVAL;
 666         }
 667
 668         len_of_ctxts = len_of_smb - offset;
 669
 670         for (i = 0; i < ctxt_cnt; i++) {
 671                 int clen;
 672                 /* check that offset is not beyond end of SMB */
 673                 if (len_of_ctxts == 0)
 674                         break;
 675
 676                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 677                         break;
 678
 679                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 680                 clen = le16_to_cpu(pctx->DataLength);
 681                 if (clen > len_of_ctxts)
 682                         break;
 683
 684                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 685                         decode_preauth_context(
 686                                 (struct smb2_preauth_neg_context *)pctx);
 687                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 688                         rc = decode_encrypt_ctx(server,
 689                                 (struct smb2_encryption_neg_context *)pctx);
 690                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 691                         decode_compress_ctx(server,
 692                                 (struct smb2_compression_capabilities_context *)pctx);
 693                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 694                         server->posix_ext_supported = true;
 695                 else
 696                         cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
 697                                 le16_to_cpu(pctx->ContextType));
 698
 699                 if (rc)
 700                         break;
 701                 /* offsets must be 8 byte aligned */
 702                 clen = (clen + 7) & ~0x7;
 703                 offset += clen + sizeof(struct smb2_neg_context);
 704                 len_of_ctxts -= clen;
 705         }
 706         return rc;
 707 }
 708
 709 static struct create_posix *
 710 create_posix_buf(umode_t mode)
 711 {
 712         struct create_posix *buf;
 713
 714         buf = kzalloc(sizeof(struct create_posix),
 715                         GFP_KERNEL);
 716         if (!buf)
 717                 return NULL;
 718
 719         buf->ccontext.DataOffset =
 720                 cpu_to_le16(offsetof(struct create_posix, Mode));
 721         buf->ccontext.DataLength = cpu_to_le32(4);
 722         buf->ccontext.NameOffset =
 723                 cpu_to_le16(offsetof(struct create_posix, Name));
 724         buf->ccontext.NameLength = cpu_to_le16(16);
 725
 726         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 727         buf->Name[0] = 0x93;
 728         buf->Name[1] = 0xAD;
 729         buf->Name[2] = 0x25;
 730         buf->Name[3] = 0x50;
 731         buf->Name[4] = 0x9C;
 732         buf->Name[5] = 0xB4;
 733         buf->Name[6] = 0x11;
 734         buf->Name[7] = 0xE7;
 735         buf->Name[8] = 0xB4;
 736         buf->Name[9] = 0x23;
 737         buf->Name[10] = 0x83;
 738         buf->Name[11] = 0xDE;
 739         buf->Name[12] = 0x96;
 740         buf->Name[13] = 0x8B;
 741         buf->Name[14] = 0xCD;
 742         buf->Name[15] = 0x7C;
 743         buf->Mode = cpu_to_le32(mode);
 744         cifs_dbg(FYI, "mode on posix create 0%o", mode);
 745         return buf;
 746 }
 747
 748 static int
 749 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 750 {
 751         struct smb2_create_req *req = iov[0].iov_base;
 752         unsigned int num = *num_iovec;
 753
 754         iov[num].iov_base = create_posix_buf(mode);
 755         if (iov[num].iov_base == NULL)
 756                 return -ENOMEM;
 757         iov[num].iov_len = sizeof(struct create_posix);
 758         if (!req->CreateContextsOffset)
 759                 req->CreateContextsOffset = cpu_to_le32(
 760                                 sizeof(struct smb2_create_req) +
 761                                 iov[num - 1].iov_len);
 762         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 763         *num_iovec = num + 1;
 764         return 0;
 765 }
 766
 767
 768 /*
 769  *
 770  *      SMB2 Worker functions follow:
 771  *
 772  *      The general structure of the worker functions is:
 773  *      1) Call smb2_init (assembles SMB2 header)
 774  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 775  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 776  *      4) Decode SMB2 command specific fields in the fixed length area
 777  *      5) Decode variable length data area (if any for this SMB2 command type)
 778  *      6) Call free smb buffer
 779  *      7) return
 780  *
 781  */
 782
 783 int
 784 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 785 {
 786         struct smb_rqst rqst;
 787         struct smb2_negotiate_req *req;
 788         struct smb2_negotiate_rsp *rsp;
 789         struct kvec iov[1];
 790         struct kvec rsp_iov;
 791         int rc = 0;
 792         int resp_buftype;
 793         struct TCP_Server_Info *server = ses->server;
 794         int blob_offset, blob_length;
 795         char *security_blob;
 796         int flags = CIFS_NEG_OP;
 797         unsigned int total_len;
 798
 799         cifs_dbg(FYI, "Negotiate protocol\n");
 800
 801         if (!server) {
 802                 WARN(1, "%s: server is NULL!\n", __func__);
 803                 return -EIO;
 804         }
 805
 806         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 807         if (rc)
 808                 return rc;
 809
 810         req->sync_hdr.SessionId = 0;
 811
 812         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 813         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 814
 815         if (strcmp(ses->server->vals->version_string,
 816                    SMB3ANY_VERSION_STRING) == 0) {
 817                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 818                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 819                 req->DialectCount = cpu_to_le16(2);
 820                 total_len += 4;
 821         } else if (strcmp(ses->server->vals->version_string,
 822                    SMBDEFAULT_VERSION_STRING) == 0) {
 823                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 824                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 825                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 826                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 827                 req->DialectCount = cpu_to_le16(4);
 828                 total_len += 8;
 829         } else {
 830                 /* otherwise send specific dialect */
 831                 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 832                 req->DialectCount = cpu_to_le16(1);
 833                 total_len += 2;
 834         }
 835
 836         /* only one of SMB2 signing flags may be set in SMB2 request */
 837         if (ses->sign)
 838                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 839         else if (global_secflags & CIFSSEC_MAY_SIGN)
 840                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 841         else
 842                 req->SecurityMode = 0;
 843
 844         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 845
 846         /* ClientGUID must be zero for SMB2.02 dialect */
 847         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 848                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 849         else {
 850                 memcpy(req->ClientGUID, server->client_guid,
 851                         SMB2_CLIENT_GUID_SIZE);
 852                 if ((ses->server->vals->protocol_id == SMB311_PROT_ID) ||
 853                     (strcmp(ses->server->vals->version_string,
 854                      SMBDEFAULT_VERSION_STRING) == 0))
 855                         assemble_neg_contexts(req, server, &total_len);
 856         }
 857         iov[0].iov_base = (char *)req;
 858         iov[0].iov_len = total_len;
 859
 860         memset(&rqst, 0, sizeof(struct smb_rqst));
 861         rqst.rq_iov = iov;
 862         rqst.rq_nvec = 1;
 863
 864         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
 865         cifs_small_buf_release(req);
 866         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 867         /*
 868          * No tcon so can't do
 869          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 870          */
 871         if (rc == -EOPNOTSUPP) {
 872                 cifs_dbg(VFS, "Dialect not supported by server. Consider "
 873                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 874                         " older servers\n");
 875                 goto neg_exit;
 876         } else if (rc != 0)
 877                 goto neg_exit;
 878
 879         if (strcmp(ses->server->vals->version_string,
 880                    SMB3ANY_VERSION_STRING) == 0) {
 881                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 882                         cifs_dbg(VFS,
 883                                 "SMB2 dialect returned but not requested\n");
 884                         return -EIO;
 885                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 886                         cifs_dbg(VFS,
 887                                 "SMB2.1 dialect returned but not requested\n");
 888                         return -EIO;
 889                 }
 890         } else if (strcmp(ses->server->vals->version_string,
 891                    SMBDEFAULT_VERSION_STRING) == 0) {
 892                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 893                         cifs_dbg(VFS,
 894                                 "SMB2 dialect returned but not requested\n");
 895                         return -EIO;
 896                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 897                         /* ops set to 3.0 by default for default so update */
 898                         ses->server->ops = &smb21_operations;
 899                         ses->server->vals = &smb21_values;
 900                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 901                         ses->server->ops = &smb311_operations;
 902                         ses->server->vals = &smb311_values;
 903                 }
 904         } else if (le16_to_cpu(rsp->DialectRevision) !=
 905                                 ses->server->vals->protocol_id) {
 906                 /* if requested single dialect ensure returned dialect matched */
 907                 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 908                         le16_to_cpu(rsp->DialectRevision));
 909                 return -EIO;
 910         }
 911
 912         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 913
 914         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 915                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 916         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 917                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 918         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 919                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 920         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 921                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 922         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 923                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 924         else {
 925                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 926                          le16_to_cpu(rsp->DialectRevision));
 927                 rc = -EIO;
 928                 goto neg_exit;
 929         }
 930         server->dialect = le16_to_cpu(rsp->DialectRevision);
 931
 932         /*
 933          * Keep a copy of the hash after negprot. This hash will be
 934          * the starting hash value for all sessions made from this
 935          * server.
 936          */
 937         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 938                SMB2_PREAUTH_HASH_SIZE);
 939
 940         /* SMB2 only has an extended negflavor */
 941         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 942         /* set it to the maximum buffer size value we can send with 1 credit */
 943         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 944                                SMB2_MAX_BUFFER_SIZE);
 945         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 946         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 947         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 948         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 949                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 950                                 server->sec_mode);
 951         server->capabilities = le32_to_cpu(rsp->Capabilities);
 952         /* Internal types */
 953         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 954
 955         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 956                                                (struct smb2_sync_hdr *)rsp);
 957         /*
 958          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 959          * for us will be
 960          *      ses->sectype = RawNTLMSSP;
 961          * but for time being this is our only auth choice so doesn't matter.
 962          * We just found a server which sets blob length to zero expecting raw.
 963          */
 964         if (blob_length == 0) {
 965                 cifs_dbg(FYI, "missing security blob on negprot\n");
 966                 server->sec_ntlmssp = true;
 967         }
 968
 969         rc = cifs_enable_signing(server, ses->sign);
 970         if (rc)
 971                 goto neg_exit;
 972         if (blob_length) {
 973                 rc = decode_negTokenInit(security_blob, blob_length, server);
 974                 if (rc == 1)
 975                         rc = 0;
 976                 else if (rc == 0)
 977                         rc = -EIO;
 978         }
 979
 980         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 981                 if (rsp->NegotiateContextCount)
 982                         rc = smb311_decode_neg_context(rsp, server,
 983                                                        rsp_iov.iov_len);
 984                 else
 985                         cifs_dbg(VFS, "Missing expected negotiate contexts\n");
 986         }
 987 neg_exit:
 988         free_rsp_buf(resp_buftype, rsp);
 989         return rc;
 990 }
 991
 992 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 993 {
 994         int rc;
 995         struct validate_negotiate_info_req *pneg_inbuf;
 996         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 997         u32 rsplen;
 998         u32 inbuflen; /* max of 4 dialects */
 999
1000         cifs_dbg(FYI, "validate negotiate\n");
1001
1002         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1003         if (tcon->ses->server->dialect == SMB311_PROT_ID)
1004                 return 0;
1005
1006         /*
1007          * validation ioctl must be signed, so no point sending this if we
1008          * can not sign it (ie are not known user).  Even if signing is not
1009          * required (enabled but not negotiated), in those cases we selectively
1010          * sign just this, the first and only signed request on a connection.
1011          * Having validation of negotiate info  helps reduce attack vectors.
1012          */
1013         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1014                 return 0; /* validation requires signing */
1015
1016         if (tcon->ses->user_name == NULL) {
1017                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1018                 return 0; /* validation requires signing */
1019         }
1020
1021         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1022                 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1023
1024         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1025         if (!pneg_inbuf)
1026                 return -ENOMEM;
1027
1028         pneg_inbuf->Capabilities =
1029                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
1030         memcpy(pneg_inbuf->Guid, tcon->ses->server->client_guid,
1031                                         SMB2_CLIENT_GUID_SIZE);
1032
1033         if (tcon->ses->sign)
1034                 pneg_inbuf->SecurityMode =
1035                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1036         else if (global_secflags & CIFSSEC_MAY_SIGN)
1037                 pneg_inbuf->SecurityMode =
1038                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1039         else
1040                 pneg_inbuf->SecurityMode = 0;
1041
1042
1043         if (strcmp(tcon->ses->server->vals->version_string,
1044                 SMB3ANY_VERSION_STRING) == 0) {
1045                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1046                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1047                 pneg_inbuf->DialectCount = cpu_to_le16(2);
1048                 /* structure is big enough for 3 dialects, sending only 2 */
1049                 inbuflen = sizeof(*pneg_inbuf) -
1050                                 (2 * sizeof(pneg_inbuf->Dialects[0]));
1051         } else if (strcmp(tcon->ses->server->vals->version_string,
1052                 SMBDEFAULT_VERSION_STRING) == 0) {
1053                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1054                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1055                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1056                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1057                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1058                 /* structure is big enough for 3 dialects */
1059                 inbuflen = sizeof(*pneg_inbuf);
1060         } else {
1061                 /* otherwise specific dialect was requested */
1062                 pneg_inbuf->Dialects[0] =
1063                         cpu_to_le16(tcon->ses->server->vals->protocol_id);
1064                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1065                 /* structure is big enough for 3 dialects, sending only 1 */
1066                 inbuflen = sizeof(*pneg_inbuf) -
1067                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
1068         }
1069
1070         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1071                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1072                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1073                 (char **)&pneg_rsp, &rsplen);
1074         if (rc == -EOPNOTSUPP) {
1075                 /*
1076                  * Old Windows versions or Netapp SMB server can return
1077                  * not supported error. Client should accept it.
1078                  */
1079                 cifs_dbg(VFS, "Server does not support validate negotiate\n");
1080                 rc = 0;
1081                 goto out_free_inbuf;
1082         } else if (rc != 0) {
1083                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
1084                 rc = -EIO;
1085                 goto out_free_inbuf;
1086         }
1087
1088         rc = -EIO;
1089         if (rsplen != sizeof(*pneg_rsp)) {
1090                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
1091                          rsplen);
1092
1093                 /* relax check since Mac returns max bufsize allowed on ioctl */
1094                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1095                         goto out_free_rsp;
1096         }
1097
1098         /* check validate negotiate info response matches what we got earlier */
1099         if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
1100                 goto vneg_out;
1101
1102         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
1103                 goto vneg_out;
1104
1105         /* do not validate server guid because not saved at negprot time yet */
1106
1107         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1108               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
1109                 goto vneg_out;
1110
1111         /* validate negotiate successful */
1112         rc = 0;
1113         cifs_dbg(FYI, "validate negotiate info successful\n");
1114         goto out_free_rsp;
1115
1116 vneg_out:
1117         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1118 out_free_rsp:
1119         kfree(pneg_rsp);
1120 out_free_inbuf:
1121         kfree(pneg_inbuf);
1122         return rc;
1123 }
1124
1125 enum securityEnum
1126 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1127 {
1128         switch (requested) {
1129         case Kerberos:
1130         case RawNTLMSSP:
1131                 return requested;
1132         case NTLMv2:
1133                 return RawNTLMSSP;
1134         case Unspecified:
1135                 if (server->sec_ntlmssp &&
1136                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1137                         return RawNTLMSSP;
1138                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1139                         (global_secflags & CIFSSEC_MAY_KRB5))
1140                         return Kerberos;
1141                 /* Fallthrough */
1142         default:
1143                 return Unspecified;
1144         }
1145 }
1146
1147 struct SMB2_sess_data {
1148         unsigned int xid;
1149         struct cifs_ses *ses;
1150         struct nls_table *nls_cp;
1151         void (*func)(struct SMB2_sess_data *);
1152         int result;
1153         u64 previous_session;
1154
1155         /* we will send the SMB in three pieces:
1156          * a fixed length beginning part, an optional
1157          * SPNEGO blob (which can be zero length), and a
1158          * last part which will include the strings
1159          * and rest of bcc area. This allows us to avoid
1160          * a large buffer 17K allocation
1161          */
1162         int buf0_type;
1163         struct kvec iov[2];
1164 };
1165
1166 static int
1167 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1168 {
1169         int rc;
1170         struct cifs_ses *ses = sess_data->ses;
1171         struct smb2_sess_setup_req *req;
1172         struct TCP_Server_Info *server = ses->server;
1173         unsigned int total_len;
1174
1175         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
1176                              &total_len);
1177         if (rc)
1178                 return rc;
1179
1180         /* First session, not a reauthenticate */
1181         req->sync_hdr.SessionId = 0;
1182
1183         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
1184         req->PreviousSessionId = sess_data->previous_session;
1185
1186         req->Flags = 0; /* MBZ */
1187
1188         /* enough to enable echos and oplocks and one max size write */
1189         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1190
1191         /* only one of SMB2 signing flags may be set in SMB2 request */
1192         if (server->sign)
1193                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1194         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1195                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1196         else
1197                 req->SecurityMode = 0;
1198
1199 #ifdef CONFIG_CIFS_DFS_UPCALL
1200         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1201 #else
1202         req->Capabilities = 0;
1203 #endif /* DFS_UPCALL */
1204
1205         req->Channel = 0; /* MBZ */
1206
1207         sess_data->iov[0].iov_base = (char *)req;
1208         /* 1 for pad */
1209         sess_data->iov[0].iov_len = total_len - 1;
1210         /*
1211          * This variable will be used to clear the buffer
1212          * allocated above in case of any error in the calling function.
1213          */
1214         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1215
1216         return 0;
1217 }
1218
1219 static void
1220 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1221 {
1222         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1223         sess_data->buf0_type = CIFS_NO_BUFFER;
1224 }
1225
1226 static int
1227 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1228 {
1229         int rc;
1230         struct smb_rqst rqst;
1231         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1232         struct kvec rsp_iov = { NULL, 0 };
1233
1234         /* Testing shows that buffer offset must be at location of Buffer[0] */
1235         req->SecurityBufferOffset =
1236                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1237         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1238
1239         memset(&rqst, 0, sizeof(struct smb_rqst));
1240         rqst.rq_iov = sess_data->iov;
1241         rqst.rq_nvec = 2;
1242
1243         /* BB add code to build os and lm fields */
1244         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1245                             &rqst,
1246                             &sess_data->buf0_type,
1247                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1248         cifs_small_buf_release(sess_data->iov[0].iov_base);
1249         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1250
1251         return rc;
1252 }
1253
1254 static int
1255 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1256 {
1257         int rc = 0;
1258         struct cifs_ses *ses = sess_data->ses;
1259
1260         mutex_lock(&ses->server->srv_mutex);
1261         if (ses->server->ops->generate_signingkey) {
1262                 rc = ses->server->ops->generate_signingkey(ses);
1263                 if (rc) {
1264                         cifs_dbg(FYI,
1265                                 "SMB3 session key generation failed\n");
1266                         mutex_unlock(&ses->server->srv_mutex);
1267                         return rc;
1268                 }
1269         }
1270         if (!ses->server->session_estab) {
1271                 ses->server->sequence_number = 0x2;
1272                 ses->server->session_estab = true;
1273         }
1274         mutex_unlock(&ses->server->srv_mutex);
1275
1276         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1277         spin_lock(&GlobalMid_Lock);
1278         ses->status = CifsGood;
1279         ses->need_reconnect = false;
1280         spin_unlock(&GlobalMid_Lock);
1281         return rc;
1282 }
1283
1284 #ifdef CONFIG_CIFS_UPCALL
1285 static void
1286 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1287 {
1288         int rc;
1289         struct cifs_ses *ses = sess_data->ses;
1290         struct cifs_spnego_msg *msg;
1291         struct key *spnego_key = NULL;
1292         struct smb2_sess_setup_rsp *rsp = NULL;
1293
1294         rc = SMB2_sess_alloc_buffer(sess_data);
1295         if (rc)
1296                 goto out;
1297
1298         spnego_key = cifs_get_spnego_key(ses);
1299         if (IS_ERR(spnego_key)) {
1300                 rc = PTR_ERR(spnego_key);
1301                 spnego_key = NULL;
1302                 goto out;
1303         }
1304
1305         msg = spnego_key->payload.data[0];
1306         /*
1307          * check version field to make sure that cifs.upcall is
1308          * sending us a response in an expected form
1309          */
1310         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1311                 cifs_dbg(VFS,
1312                           "bad cifs.upcall version. Expected %d got %d",
1313                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1314                 rc = -EKEYREJECTED;
1315                 goto out_put_spnego_key;
1316         }
1317
1318         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1319                                          GFP_KERNEL);
1320         if (!ses->auth_key.response) {
1321                 cifs_dbg(VFS,
1322                         "Kerberos can't allocate (%u bytes) memory",
1323                         msg->sesskey_len);
1324                 rc = -ENOMEM;
1325                 goto out_put_spnego_key;
1326         }
1327         ses->auth_key.len = msg->sesskey_len;
1328
1329         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1330         sess_data->iov[1].iov_len = msg->secblob_len;
1331
1332         rc = SMB2_sess_sendreceive(sess_data);
1333         if (rc)
1334                 goto out_put_spnego_key;
1335
1336         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1337         ses->Suid = rsp->sync_hdr.SessionId;
1338
1339         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1340
1341         rc = SMB2_sess_establish_session(sess_data);
1342 out_put_spnego_key:
1343         key_invalidate(spnego_key);
1344         key_put(spnego_key);
1345 out:
1346         sess_data->result = rc;
1347         sess_data->func = NULL;
1348         SMB2_sess_free_buffer(sess_data);
1349 }
1350 #else
1351 static void
1352 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1353 {
1354         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1355         sess_data->result = -EOPNOTSUPP;
1356         sess_data->func = NULL;
1357 }
1358 #endif
1359
1360 static void
1361 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1362
1363 static void
1364 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1365 {
1366         int rc;
1367         struct cifs_ses *ses = sess_data->ses;
1368         struct smb2_sess_setup_rsp *rsp = NULL;
1369         char *ntlmssp_blob = NULL;
1370         bool use_spnego = false; /* else use raw ntlmssp */
1371         u16 blob_length = 0;
1372
1373         /*
1374          * If memory allocation is successful, caller of this function
1375          * frees it.
1376          */
1377         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1378         if (!ses->ntlmssp) {
1379                 rc = -ENOMEM;
1380                 goto out_err;
1381         }
1382         ses->ntlmssp->sesskey_per_smbsess = true;
1383
1384         rc = SMB2_sess_alloc_buffer(sess_data);
1385         if (rc)
1386                 goto out_err;
1387
1388         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1389                                GFP_KERNEL);
1390         if (ntlmssp_blob == NULL) {
1391                 rc = -ENOMEM;
1392                 goto out;
1393         }
1394
1395         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1396         if (use_spnego) {
1397                 /* BB eventually need to add this */
1398                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1399                 rc = -EOPNOTSUPP;
1400                 goto out;
1401         } else {
1402                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1403                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1404         }
1405         sess_data->iov[1].iov_base = ntlmssp_blob;
1406         sess_data->iov[1].iov_len = blob_length;
1407
1408         rc = SMB2_sess_sendreceive(sess_data);
1409         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1410
1411         /* If true, rc here is expected and not an error */
1412         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1413                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1414                 rc = 0;
1415
1416         if (rc)
1417                 goto out;
1418
1419         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1420                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1421                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1422                         le16_to_cpu(rsp->SecurityBufferOffset));
1423                 rc = -EIO;
1424                 goto out;
1425         }
1426         rc = decode_ntlmssp_challenge(rsp->Buffer,
1427                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1428         if (rc)
1429                 goto out;
1430
1431         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1432
1433
1434         ses->Suid = rsp->sync_hdr.SessionId;
1435         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1436
1437 out:
1438         kfree(ntlmssp_blob);
1439         SMB2_sess_free_buffer(sess_data);
1440         if (!rc) {
1441                 sess_data->result = 0;
1442                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1443                 return;
1444         }
1445 out_err:
1446         kfree(ses->ntlmssp);
1447         ses->ntlmssp = NULL;
1448         sess_data->result = rc;
1449         sess_data->func = NULL;
1450 }
1451
1452 static void
1453 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1454 {
1455         int rc;
1456         struct cifs_ses *ses = sess_data->ses;
1457         struct smb2_sess_setup_req *req;
1458         struct smb2_sess_setup_rsp *rsp = NULL;
1459         unsigned char *ntlmssp_blob = NULL;
1460         bool use_spnego = false; /* else use raw ntlmssp */
1461         u16 blob_length = 0;
1462
1463         rc = SMB2_sess_alloc_buffer(sess_data);
1464         if (rc)
1465                 goto out;
1466
1467         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1468         req->sync_hdr.SessionId = ses->Suid;
1469
1470         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1471                                         sess_data->nls_cp);
1472         if (rc) {
1473                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1474                 goto out;
1475         }
1476
1477         if (use_spnego) {
1478                 /* BB eventually need to add this */
1479                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1480                 rc = -EOPNOTSUPP;
1481                 goto out;
1482         }
1483         sess_data->iov[1].iov_base = ntlmssp_blob;
1484         sess_data->iov[1].iov_len = blob_length;
1485
1486         rc = SMB2_sess_sendreceive(sess_data);
1487         if (rc)
1488                 goto out;
1489
1490         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1491
1492         ses->Suid = rsp->sync_hdr.SessionId;
1493         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1494
1495         rc = SMB2_sess_establish_session(sess_data);
1496 out:
1497         kfree(ntlmssp_blob);
1498         SMB2_sess_free_buffer(sess_data);
1499         kfree(ses->ntlmssp);
1500         ses->ntlmssp = NULL;
1501         sess_data->result = rc;
1502         sess_data->func = NULL;
1503 }
1504
1505 static int
1506 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1507 {
1508         int type;
1509
1510         type = smb2_select_sectype(ses->server, ses->sectype);
1511         cifs_dbg(FYI, "sess setup type %d\n", type);
1512         if (type == Unspecified) {
1513                 cifs_dbg(VFS,
1514                         "Unable to select appropriate authentication method!");
1515                 return -EINVAL;
1516         }
1517
1518         switch (type) {
1519         case Kerberos:
1520                 sess_data->func = SMB2_auth_kerberos;
1521                 break;
1522         case RawNTLMSSP:
1523                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1524                 break;
1525         default:
1526                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1527                 return -EOPNOTSUPP;
1528         }
1529
1530         return 0;
1531 }
1532
1533 int
1534 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1535                 const struct nls_table *nls_cp)
1536 {
1537         int rc = 0;
1538         struct TCP_Server_Info *server = ses->server;
1539         struct SMB2_sess_data *sess_data;
1540
1541         cifs_dbg(FYI, "Session Setup\n");
1542
1543         if (!server) {
1544                 WARN(1, "%s: server is NULL!\n", __func__);
1545                 return -EIO;
1546         }
1547
1548         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1549         if (!sess_data)
1550                 return -ENOMEM;
1551
1552         rc = SMB2_select_sec(ses, sess_data);
1553         if (rc)
1554                 goto out;
1555         sess_data->xid = xid;
1556         sess_data->ses = ses;
1557         sess_data->buf0_type = CIFS_NO_BUFFER;
1558         sess_data->nls_cp = (struct nls_table *) nls_cp;
1559         sess_data->previous_session = ses->Suid;
1560
1561         /*
1562          * Initialize the session hash with the server one.
1563          */
1564         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1565                SMB2_PREAUTH_HASH_SIZE);
1566
1567         while (sess_data->func)
1568                 sess_data->func(sess_data);
1569
1570         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1571                 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1572         rc = sess_data->result;
1573 out:
1574         kfree(sess_data);
1575         return rc;
1576 }
1577
1578 int
1579 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1580 {
1581         struct smb_rqst rqst;
1582         struct smb2_logoff_req *req; /* response is also trivial struct */
1583         int rc = 0;
1584         struct TCP_Server_Info *server;
1585         int flags = 0;
1586         unsigned int total_len;
1587         struct kvec iov[1];
1588         struct kvec rsp_iov;
1589         int resp_buf_type;
1590
1591         cifs_dbg(FYI, "disconnect session %p\n", ses);
1592
1593         if (ses && (ses->server))
1594                 server = ses->server;
1595         else
1596                 return -EIO;
1597
1598         /* no need to send SMB logoff if uid already closed due to reconnect */
1599         if (ses->need_reconnect)
1600                 goto smb2_session_already_dead;
1601
1602         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1603         if (rc)
1604                 return rc;
1605
1606          /* since no tcon, smb2_init can not do this, so do here */
1607         req->sync_hdr.SessionId = ses->Suid;
1608
1609         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1610                 flags |= CIFS_TRANSFORM_REQ;
1611         else if (server->sign)
1612                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1613
1614         flags |= CIFS_NO_RSP_BUF;
1615
1616         iov[0].iov_base = (char *)req;
1617         iov[0].iov_len = total_len;
1618
1619         memset(&rqst, 0, sizeof(struct smb_rqst));
1620         rqst.rq_iov = iov;
1621         rqst.rq_nvec = 1;
1622
1623         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1624         cifs_small_buf_release(req);
1625         /*
1626          * No tcon so can't do
1627          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1628          */
1629
1630 smb2_session_already_dead:
1631         return rc;
1632 }
1633
1634 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1635 {
1636         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1637 }
1638
1639 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1640
1641 /* These are similar values to what Windows uses */
1642 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1643 {
1644         tcon->max_chunks = 256;
1645         tcon->max_bytes_chunk = 1048576;
1646         tcon->max_bytes_copy = 16777216;
1647 }
1648
1649 int
1650 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1651           struct cifs_tcon *tcon, const struct nls_table *cp)
1652 {
1653         struct smb_rqst rqst;
1654         struct smb2_tree_connect_req *req;
1655         struct smb2_tree_connect_rsp *rsp = NULL;
1656         struct kvec iov[2];
1657         struct kvec rsp_iov = { NULL, 0 };
1658         int rc = 0;
1659         int resp_buftype;
1660         int unc_path_len;
1661         __le16 *unc_path = NULL;
1662         int flags = 0;
1663         unsigned int total_len;
1664
1665         cifs_dbg(FYI, "TCON\n");
1666
1667         if (!(ses->server) || !tree)
1668                 return -EIO;
1669
1670         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1671         if (unc_path == NULL)
1672                 return -ENOMEM;
1673
1674         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1675         unc_path_len *= 2;
1676         if (unc_path_len < 2) {
1677                 kfree(unc_path);
1678                 return -EINVAL;
1679         }
1680
1681         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1682         tcon->tid = 0;
1683         atomic_set(&tcon->num_remote_opens, 0);
1684         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1685                              &total_len);
1686         if (rc) {
1687                 kfree(unc_path);
1688                 return rc;
1689         }
1690
1691         if (smb3_encryption_required(tcon))
1692                 flags |= CIFS_TRANSFORM_REQ;
1693
1694         iov[0].iov_base = (char *)req;
1695         /* 1 for pad */
1696         iov[0].iov_len = total_len - 1;
1697
1698         /* Testing shows that buffer offset must be at location of Buffer[0] */
1699         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1700                         - 1 /* pad */);
1701         req->PathLength = cpu_to_le16(unc_path_len - 2);
1702         iov[1].iov_base = unc_path;
1703         iov[1].iov_len = unc_path_len;
1704
1705         /*
1706          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1707          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1708          * (Samba servers don't always set the flag so also check if null user)
1709          */
1710         if ((ses->server->dialect == SMB311_PROT_ID) &&
1711             !smb3_encryption_required(tcon) &&
1712             !(ses->session_flags &
1713                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1714             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1715                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1716
1717         memset(&rqst, 0, sizeof(struct smb_rqst));
1718         rqst.rq_iov = iov;
1719         rqst.rq_nvec = 2;
1720
1721         /* Need 64 for max size write so ask for more in case not there yet */
1722         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1723
1724         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1725         cifs_small_buf_release(req);
1726         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1727         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1728         if (rc != 0) {
1729                 if (tcon) {
1730                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1731                         tcon->need_reconnect = true;
1732                 }
1733                 goto tcon_error_exit;
1734         }
1735
1736         switch (rsp->ShareType) {
1737         case SMB2_SHARE_TYPE_DISK:
1738                 cifs_dbg(FYI, "connection to disk share\n");
1739                 break;
1740         case SMB2_SHARE_TYPE_PIPE:
1741                 tcon->pipe = true;
1742                 cifs_dbg(FYI, "connection to pipe share\n");
1743                 break;
1744         case SMB2_SHARE_TYPE_PRINT:
1745                 tcon->print = true;
1746                 cifs_dbg(FYI, "connection to printer\n");
1747                 break;
1748         default:
1749                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1750                 rc = -EOPNOTSUPP;
1751                 goto tcon_error_exit;
1752         }
1753
1754         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1755         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1756         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1757         tcon->tidStatus = CifsGood;
1758         tcon->need_reconnect = false;
1759         tcon->tid = rsp->sync_hdr.TreeId;
1760         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1761
1762         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1763             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1764                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1765
1766         if (tcon->seal &&
1767             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1768                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1769
1770         init_copy_chunk_defaults(tcon);
1771         if (tcon->ses->server->ops->validate_negotiate)
1772                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1773 tcon_exit:
1774
1775         free_rsp_buf(resp_buftype, rsp);
1776         kfree(unc_path);
1777         return rc;
1778
1779 tcon_error_exit:
1780         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1781                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1782         }
1783         goto tcon_exit;
1784 }
1785
1786 int
1787 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1788 {
1789         struct smb_rqst rqst;
1790         struct smb2_tree_disconnect_req *req; /* response is trivial */
1791         int rc = 0;
1792         struct cifs_ses *ses = tcon->ses;
1793         int flags = 0;
1794         unsigned int total_len;
1795         struct kvec iov[1];
1796         struct kvec rsp_iov;
1797         int resp_buf_type;
1798
1799         cifs_dbg(FYI, "Tree Disconnect\n");
1800
1801         if (!ses || !(ses->server))
1802                 return -EIO;
1803
1804         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1805                 return 0;
1806
1807         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1808                              &total_len);
1809         if (rc)
1810                 return rc;
1811
1812         if (smb3_encryption_required(tcon))
1813                 flags |= CIFS_TRANSFORM_REQ;
1814
1815         flags |= CIFS_NO_RSP_BUF;
1816
1817         iov[0].iov_base = (char *)req;
1818         iov[0].iov_len = total_len;
1819
1820         memset(&rqst, 0, sizeof(struct smb_rqst));
1821         rqst.rq_iov = iov;
1822         rqst.rq_nvec = 1;
1823
1824         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1825         cifs_small_buf_release(req);
1826         if (rc)
1827                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1828
1829         return rc;
1830 }
1831
1832
1833 static struct create_durable *
1834 create_durable_buf(void)
1835 {
1836         struct create_durable *buf;
1837
1838         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1839         if (!buf)
1840                 return NULL;
1841
1842         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1843                                         (struct create_durable, Data));
1844         buf->ccontext.DataLength = cpu_to_le32(16);
1845         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1846                                 (struct create_durable, Name));
1847         buf->ccontext.NameLength = cpu_to_le16(4);
1848         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1849         buf->Name[0] = 'D';
1850         buf->Name[1] = 'H';
1851         buf->Name[2] = 'n';
1852         buf->Name[3] = 'Q';
1853         return buf;
1854 }
1855
1856 static struct create_durable *
1857 create_reconnect_durable_buf(struct cifs_fid *fid)
1858 {
1859         struct create_durable *buf;
1860
1861         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1862         if (!buf)
1863                 return NULL;
1864
1865         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1866                                         (struct create_durable, Data));
1867         buf->ccontext.DataLength = cpu_to_le32(16);
1868         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1869                                 (struct create_durable, Name));
1870         buf->ccontext.NameLength = cpu_to_le16(4);
1871         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1872         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1873         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1874         buf->Name[0] = 'D';
1875         buf->Name[1] = 'H';
1876         buf->Name[2] = 'n';
1877         buf->Name[3] = 'C';
1878         return buf;
1879 }
1880
1881 static void
1882 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
1883 {
1884         struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
1885
1886         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
1887                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
1888         buf->IndexNumber = pdisk_id->DiskFileId;
1889 }
1890
1891 void
1892 smb2_parse_contexts(struct TCP_Server_Info *server,
1893                        struct smb2_create_rsp *rsp,
1894                        unsigned int *epoch, char *lease_key, __u8 *oplock,
1895                        struct smb2_file_all_info *buf)
1896 {
1897         char *data_offset;
1898         struct create_context *cc;
1899         unsigned int next;
1900         unsigned int remaining;
1901         char *name;
1902
1903         *oplock = 0;
1904         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1905         remaining = le32_to_cpu(rsp->CreateContextsLength);
1906         cc = (struct create_context *)data_offset;
1907
1908         /* Initialize inode number to 0 in case no valid data in qfid context */
1909         if (buf)
1910                 buf->IndexNumber = 0;
1911
1912         while (remaining >= sizeof(struct create_context)) {
1913                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1914                 if (le16_to_cpu(cc->NameLength) == 4 &&
1915                     strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
1916                         *oplock = server->ops->parse_lease_buf(cc, epoch,
1917                                                            lease_key);
1918                 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
1919                     strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
1920                         parse_query_id_ctxt(cc, buf);
1921
1922                 next = le32_to_cpu(cc->Next);
1923                 if (!next)
1924                         break;
1925                 remaining -= next;
1926                 cc = (struct create_context *)((char *)cc + next);
1927         }
1928
1929         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
1930                 *oplock = rsp->OplockLevel;
1931
1932         return;
1933 }
1934
1935 static int
1936 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1937                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1938 {
1939         struct smb2_create_req *req = iov[0].iov_base;
1940         unsigned int num = *num_iovec;
1941
1942         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1943         if (iov[num].iov_base == NULL)
1944                 return -ENOMEM;
1945         iov[num].iov_len = server->vals->create_lease_size;
1946         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1947         if (!req->CreateContextsOffset)
1948                 req->CreateContextsOffset = cpu_to_le32(
1949                                 sizeof(struct smb2_create_req) +
1950                                 iov[num - 1].iov_len);
1951         le32_add_cpu(&req->CreateContextsLength,
1952                      server->vals->create_lease_size);
1953         *num_iovec = num + 1;
1954         return 0;
1955 }
1956
1957 static struct create_durable_v2 *
1958 create_durable_v2_buf(struct cifs_open_parms *oparms)
1959 {
1960         struct cifs_fid *pfid = oparms->fid;
1961         struct create_durable_v2 *buf;
1962
1963         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1964         if (!buf)
1965                 return NULL;
1966
1967         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1968                                         (struct create_durable_v2, dcontext));
1969         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1970         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1971                                 (struct create_durable_v2, Name));
1972         buf->ccontext.NameLength = cpu_to_le16(4);
1973
1974         /*
1975          * NB: Handle timeout defaults to 0, which allows server to choose
1976          * (most servers default to 120 seconds) and most clients default to 0.
1977          * This can be overridden at mount ("handletimeout=") if the user wants
1978          * a different persistent (or resilient) handle timeout for all opens
1979          * opens on a particular SMB3 mount.
1980          */
1981         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
1982         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1983         generate_random_uuid(buf->dcontext.CreateGuid);
1984         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1985
1986         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1987         buf->Name[0] = 'D';
1988         buf->Name[1] = 'H';
1989         buf->Name[2] = '2';
1990         buf->Name[3] = 'Q';
1991         return buf;
1992 }
1993
1994 static struct create_durable_handle_reconnect_v2 *
1995 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1996 {
1997         struct create_durable_handle_reconnect_v2 *buf;
1998
1999         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2000                         GFP_KERNEL);
2001         if (!buf)
2002                 return NULL;
2003
2004         buf->ccontext.DataOffset =
2005                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2006                                      dcontext));
2007         buf->ccontext.DataLength =
2008                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2009         buf->ccontext.NameOffset =
2010                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2011                             Name));
2012         buf->ccontext.NameLength = cpu_to_le16(4);
2013
2014         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2015         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2016         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2017         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2018
2019         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2020         buf->Name[0] = 'D';
2021         buf->Name[1] = 'H';
2022         buf->Name[2] = '2';
2023         buf->Name[3] = 'C';
2024         return buf;
2025 }
2026
2027 static int
2028 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2029                     struct cifs_open_parms *oparms)
2030 {
2031         struct smb2_create_req *req = iov[0].iov_base;
2032         unsigned int num = *num_iovec;
2033
2034         iov[num].iov_base = create_durable_v2_buf(oparms);
2035         if (iov[num].iov_base == NULL)
2036                 return -ENOMEM;
2037         iov[num].iov_len = sizeof(struct create_durable_v2);
2038         if (!req->CreateContextsOffset)
2039                 req->CreateContextsOffset =
2040                         cpu_to_le32(sizeof(struct smb2_create_req) +
2041                                                                 iov[1].iov_len);
2042         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2043         *num_iovec = num + 1;
2044         return 0;
2045 }
2046
2047 static int
2048 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2049                     struct cifs_open_parms *oparms)
2050 {
2051         struct smb2_create_req *req = iov[0].iov_base;
2052         unsigned int num = *num_iovec;
2053
2054         /* indicate that we don't need to relock the file */
2055         oparms->reconnect = false;
2056
2057         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2058         if (iov[num].iov_base == NULL)
2059                 return -ENOMEM;
2060         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2061         if (!req->CreateContextsOffset)
2062                 req->CreateContextsOffset =
2063                         cpu_to_le32(sizeof(struct smb2_create_req) +
2064                                                                 iov[1].iov_len);
2065         le32_add_cpu(&req->CreateContextsLength,
2066                         sizeof(struct create_durable_handle_reconnect_v2));
2067         *num_iovec = num + 1;
2068         return 0;
2069 }
2070
2071 static int
2072 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2073                     struct cifs_open_parms *oparms, bool use_persistent)
2074 {
2075         struct smb2_create_req *req = iov[0].iov_base;
2076         unsigned int num = *num_iovec;
2077
2078         if (use_persistent) {
2079                 if (oparms->reconnect)
2080                         return add_durable_reconnect_v2_context(iov, num_iovec,
2081                                                                 oparms);
2082                 else
2083                         return add_durable_v2_context(iov, num_iovec, oparms);
2084         }
2085
2086         if (oparms->reconnect) {
2087                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2088                 /* indicate that we don't need to relock the file */
2089                 oparms->reconnect = false;
2090         } else
2091                 iov[num].iov_base = create_durable_buf();
2092         if (iov[num].iov_base == NULL)
2093                 return -ENOMEM;
2094         iov[num].iov_len = sizeof(struct create_durable);
2095         if (!req->CreateContextsOffset)
2096                 req->CreateContextsOffset =
2097                         cpu_to_le32(sizeof(struct smb2_create_req) +
2098                                                                 iov[1].iov_len);
2099         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2100         *num_iovec = num + 1;
2101         return 0;
2102 }
2103
2104 /* See MS-SMB2 2.2.13.2.7 */
2105 static struct crt_twarp_ctxt *
2106 create_twarp_buf(__u64 timewarp)
2107 {
2108         struct crt_twarp_ctxt *buf;
2109
2110         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2111         if (!buf)
2112                 return NULL;
2113
2114         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2115                                         (struct crt_twarp_ctxt, Timestamp));
2116         buf->ccontext.DataLength = cpu_to_le32(8);
2117         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2118                                 (struct crt_twarp_ctxt, Name));
2119         buf->ccontext.NameLength = cpu_to_le16(4);
2120         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2121         buf->Name[0] = 'T';
2122         buf->Name[1] = 'W';
2123         buf->Name[2] = 'r';
2124         buf->Name[3] = 'p';
2125         buf->Timestamp = cpu_to_le64(timewarp);
2126         return buf;
2127 }
2128
2129 /* See MS-SMB2 2.2.13.2.7 */
2130 static int
2131 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2132 {
2133         struct smb2_create_req *req = iov[0].iov_base;
2134         unsigned int num = *num_iovec;
2135
2136         iov[num].iov_base = create_twarp_buf(timewarp);
2137         if (iov[num].iov_base == NULL)
2138                 return -ENOMEM;
2139         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2140         if (!req->CreateContextsOffset)
2141                 req->CreateContextsOffset = cpu_to_le32(
2142                                 sizeof(struct smb2_create_req) +
2143                                 iov[num - 1].iov_len);
2144         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2145         *num_iovec = num + 1;
2146         return 0;
2147 }
2148
2149 static struct crt_query_id_ctxt *
2150 create_query_id_buf(void)
2151 {
2152         struct crt_query_id_ctxt *buf;
2153
2154         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2155         if (!buf)
2156                 return NULL;
2157
2158         buf->ccontext.DataOffset = cpu_to_le16(0);
2159         buf->ccontext.DataLength = cpu_to_le32(0);
2160         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2161                                 (struct crt_query_id_ctxt, Name));
2162         buf->ccontext.NameLength = cpu_to_le16(4);
2163         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2164         buf->Name[0] = 'Q';
2165         buf->Name[1] = 'F';
2166         buf->Name[2] = 'i';
2167         buf->Name[3] = 'd';
2168         return buf;
2169 }
2170
2171 /* See MS-SMB2 2.2.13.2.9 */
2172 static int
2173 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2174 {
2175         struct smb2_create_req *req = iov[0].iov_base;
2176         unsigned int num = *num_iovec;
2177
2178         iov[num].iov_base = create_query_id_buf();
2179         if (iov[num].iov_base == NULL)
2180                 return -ENOMEM;
2181         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2182         if (!req->CreateContextsOffset)
2183                 req->CreateContextsOffset = cpu_to_le32(
2184                                 sizeof(struct smb2_create_req) +
2185                                 iov[num - 1].iov_len);
2186         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2187         *num_iovec = num + 1;
2188         return 0;
2189 }
2190
2191 static int
2192 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2193                             const char *treename, const __le16 *path)
2194 {
2195         int treename_len, path_len;
2196         struct nls_table *cp;
2197         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2198
2199         /*
2200          * skip leading "\\"
2201          */
2202         treename_len = strlen(treename);
2203         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2204                 return -EINVAL;
2205
2206         treename += 2;
2207         treename_len -= 2;
2208
2209         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2210
2211         /*
2212          * make room for one path separator between the treename and
2213          * path
2214          */
2215         *out_len = treename_len + 1 + path_len;
2216
2217         /*
2218          * final path needs to be null-terminated UTF16 with a
2219          * size aligned to 8
2220          */
2221
2222         *out_size = roundup((*out_len+1)*2, 8);
2223         *out_path = kzalloc(*out_size, GFP_KERNEL);
2224         if (!*out_path)
2225                 return -ENOMEM;
2226
2227         cp = load_nls_default();
2228         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2229         UniStrcat(*out_path, sep);
2230         UniStrcat(*out_path, path);
2231         unload_nls(cp);
2232
2233         return 0;
2234 }
2235
2236 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2237                                umode_t mode, struct cifs_tcon *tcon,
2238                                const char *full_path,
2239                                struct cifs_sb_info *cifs_sb)
2240 {
2241         struct smb_rqst rqst;
2242         struct smb2_create_req *req;
2243         struct smb2_create_rsp *rsp = NULL;
2244         struct cifs_ses *ses = tcon->ses;
2245         struct kvec iov[3]; /* make sure at least one for each open context */
2246         struct kvec rsp_iov = {NULL, 0};
2247         int resp_buftype;
2248         int uni_path_len;
2249         __le16 *copy_path = NULL;
2250         int copy_size;
2251         int rc = 0;
2252         unsigned int n_iov = 2;
2253         __u32 file_attributes = 0;
2254         char *pc_buf = NULL;
2255         int flags = 0;
2256         unsigned int total_len;
2257         __le16 *utf16_path = NULL;
2258
2259         cifs_dbg(FYI, "mkdir\n");
2260
2261         /* resource #1: path allocation */
2262         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2263         if (!utf16_path)
2264                 return -ENOMEM;
2265
2266         if (!ses || !(ses->server)) {
2267                 rc = -EIO;
2268                 goto err_free_path;
2269         }
2270
2271         /* resource #2: request */
2272         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2273         if (rc)
2274                 goto err_free_path;
2275
2276
2277         if (smb3_encryption_required(tcon))
2278                 flags |= CIFS_TRANSFORM_REQ;
2279
2280         req->ImpersonationLevel = IL_IMPERSONATION;
2281         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2282         /* File attributes ignored on open (used in create though) */
2283         req->FileAttributes = cpu_to_le32(file_attributes);
2284         req->ShareAccess = FILE_SHARE_ALL_LE;
2285         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2286         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2287
2288         iov[0].iov_base = (char *)req;
2289         /* -1 since last byte is buf[0] which is sent below (path) */
2290         iov[0].iov_len = total_len - 1;
2291
2292         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2293
2294         /* [MS-SMB2] 2.2.13 NameOffset:
2295          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2296          * the SMB2 header, the file name includes a prefix that will
2297          * be processed during DFS name normalization as specified in
2298          * section 3.3.5.9. Otherwise, the file name is relative to
2299          * the share that is identified by the TreeId in the SMB2
2300          * header.
2301          */
2302         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2303                 int name_len;
2304
2305                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2306                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2307                                                  &name_len,
2308                                                  tcon->treeName, utf16_path);
2309                 if (rc)
2310                         goto err_free_req;
2311
2312                 req->NameLength = cpu_to_le16(name_len * 2);
2313                 uni_path_len = copy_size;
2314                 /* free before overwriting resource */
2315                 kfree(utf16_path);
2316                 utf16_path = copy_path;
2317         } else {
2318                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2319                 /* MUST set path len (NameLength) to 0 opening root of share */
2320                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2321                 if (uni_path_len % 8 != 0) {
2322                         copy_size = roundup(uni_path_len, 8);
2323                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2324                         if (!copy_path) {
2325                                 rc = -ENOMEM;
2326                                 goto err_free_req;
2327                         }
2328                         memcpy((char *)copy_path, (const char *)utf16_path,
2329                                uni_path_len);
2330                         uni_path_len = copy_size;
2331                         /* free before overwriting resource */
2332                         kfree(utf16_path);
2333                         utf16_path = copy_path;
2334                 }
2335         }
2336
2337         iov[1].iov_len = uni_path_len;
2338         iov[1].iov_base = utf16_path;
2339         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2340
2341         if (tcon->posix_extensions) {
2342                 /* resource #3: posix buf */
2343                 rc = add_posix_context(iov, &n_iov, mode);
2344                 if (rc)
2345                         goto err_free_req;
2346                 pc_buf = iov[n_iov-1].iov_base;
2347         }
2348
2349
2350         memset(&rqst, 0, sizeof(struct smb_rqst));
2351         rqst.rq_iov = iov;
2352         rqst.rq_nvec = n_iov;
2353
2354         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2355                                     FILE_WRITE_ATTRIBUTES);
2356         /* resource #4: response buffer */
2357         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2358         if (rc) {
2359                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2360                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2361                                            CREATE_NOT_FILE,
2362                                            FILE_WRITE_ATTRIBUTES, rc);
2363                 goto err_free_rsp_buf;
2364         }
2365
2366         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2367         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2368                                     ses->Suid, CREATE_NOT_FILE,
2369                                     FILE_WRITE_ATTRIBUTES);
2370
2371         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2372
2373         /* Eventually save off posix specific response info and timestaps */
2374
2375 err_free_rsp_buf:
2376         free_rsp_buf(resp_buftype, rsp);
2377         kfree(pc_buf);
2378 err_free_req:
2379         cifs_small_buf_release(req);
2380 err_free_path:
2381         kfree(utf16_path);
2382         return rc;
2383 }
2384
2385 int
2386 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2387                struct cifs_open_parms *oparms, __le16 *path)
2388 {
2389         struct TCP_Server_Info *server = tcon->ses->server;
2390         struct smb2_create_req *req;
2391         unsigned int n_iov = 2;
2392         __u32 file_attributes = 0;
2393         int copy_size;
2394         int uni_path_len;
2395         unsigned int total_len;
2396         struct kvec *iov = rqst->rq_iov;
2397         __le16 *copy_path;
2398         int rc;
2399
2400         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2401         if (rc)
2402                 return rc;
2403
2404         iov[0].iov_base = (char *)req;
2405         /* -1 since last byte is buf[0] which is sent below (path) */
2406         iov[0].iov_len = total_len - 1;
2407
2408         if (oparms->create_options & CREATE_OPTION_READONLY)
2409                 file_attributes |= ATTR_READONLY;
2410         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2411                 file_attributes |= ATTR_SYSTEM;
2412
2413         req->ImpersonationLevel = IL_IMPERSONATION;
2414         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2415         /* File attributes ignored on open (used in create though) */
2416         req->FileAttributes = cpu_to_le32(file_attributes);
2417         req->ShareAccess = FILE_SHARE_ALL_LE;
2418         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2419         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2420         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2421
2422         /* [MS-SMB2] 2.2.13 NameOffset:
2423          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2424          * the SMB2 header, the file name includes a prefix that will
2425          * be processed during DFS name normalization as specified in
2426          * section 3.3.5.9. Otherwise, the file name is relative to
2427          * the share that is identified by the TreeId in the SMB2
2428          * header.
2429          */
2430         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2431                 int name_len;
2432
2433                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2434                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2435                                                  &name_len,
2436                                                  tcon->treeName, path);
2437                 if (rc)
2438                         return rc;
2439                 req->NameLength = cpu_to_le16(name_len * 2);
2440                 uni_path_len = copy_size;
2441                 path = copy_path;
2442         } else {
2443                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2444                 /* MUST set path len (NameLength) to 0 opening root of share */
2445                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2446                 copy_size = uni_path_len;
2447                 if (copy_size % 8 != 0)
2448                         copy_size = roundup(copy_size, 8);
2449                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2450                 if (!copy_path)
2451                         return -ENOMEM;
2452                 memcpy((char *)copy_path, (const char *)path,
2453                        uni_path_len);
2454                 uni_path_len = copy_size;
2455                 path = copy_path;
2456         }
2457
2458         iov[1].iov_len = uni_path_len;
2459         iov[1].iov_base = path;
2460
2461         if (!server->oplocks)
2462                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2463
2464         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2465             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2466                 req->RequestedOplockLevel = *oplock;
2467         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2468                   (oparms->create_options & CREATE_NOT_FILE))
2469                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2470         else {
2471                 rc = add_lease_context(server, iov, &n_iov,
2472                                        oparms->fid->lease_key, oplock);
2473                 if (rc)
2474                         return rc;
2475         }
2476
2477         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2478                 /* need to set Next field of lease context if we request it */
2479                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2480                         struct create_context *ccontext =
2481                             (struct create_context *)iov[n_iov-1].iov_base;
2482                         ccontext->Next =
2483                                 cpu_to_le32(server->vals->create_lease_size);
2484                 }
2485
2486                 rc = add_durable_context(iov, &n_iov, oparms,
2487                                         tcon->use_persistent);
2488                 if (rc)
2489                         return rc;
2490         }
2491
2492         if (tcon->posix_extensions) {
2493                 if (n_iov > 2) {
2494                         struct create_context *ccontext =
2495                             (struct create_context *)iov[n_iov-1].iov_base;
2496                         ccontext->Next =
2497                                 cpu_to_le32(iov[n_iov-1].iov_len);
2498                 }
2499
2500                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2501                 if (rc)
2502                         return rc;
2503         }
2504
2505         if (tcon->snapshot_time) {
2506                 cifs_dbg(FYI, "adding snapshot context\n");
2507                 if (n_iov > 2) {
2508                         struct create_context *ccontext =
2509                             (struct create_context *)iov[n_iov-1].iov_base;
2510                         ccontext->Next =
2511                                 cpu_to_le32(iov[n_iov-1].iov_len);
2512                 }
2513
2514                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2515                 if (rc)
2516                         return rc;
2517         }
2518
2519         if (n_iov > 2) {
2520                 struct create_context *ccontext =
2521                         (struct create_context *)iov[n_iov-1].iov_base;
2522                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2523         }
2524         add_query_id_context(iov, &n_iov);
2525
2526         rqst->rq_nvec = n_iov;
2527         return 0;
2528 }
2529
2530 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2531  * All other vectors are freed by kfree().
2532  */
2533 void
2534 SMB2_open_free(struct smb_rqst *rqst)
2535 {
2536         int i;
2537
2538         if (rqst && rqst->rq_iov) {
2539                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2540                 for (i = 1; i < rqst->rq_nvec; i++)
2541                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2542                                 kfree(rqst->rq_iov[i].iov_base);
2543         }
2544 }
2545
2546 int
2547 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2548           __u8 *oplock, struct smb2_file_all_info *buf,
2549           struct kvec *err_iov, int *buftype)
2550 {
2551         struct smb_rqst rqst;
2552         struct smb2_create_rsp *rsp = NULL;
2553         struct TCP_Server_Info *server;
2554         struct cifs_tcon *tcon = oparms->tcon;
2555         struct cifs_ses *ses = tcon->ses;
2556         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2557         struct kvec rsp_iov = {NULL, 0};
2558         int resp_buftype = CIFS_NO_BUFFER;
2559         int rc = 0;
2560         int flags = 0;
2561
2562         cifs_dbg(FYI, "create/open\n");
2563         if (ses && (ses->server))
2564                 server = ses->server;
2565         else
2566                 return -EIO;
2567
2568         if (smb3_encryption_required(tcon))
2569                 flags |= CIFS_TRANSFORM_REQ;
2570
2571         memset(&rqst, 0, sizeof(struct smb_rqst));
2572         memset(&iov, 0, sizeof(iov));
2573         rqst.rq_iov = iov;
2574         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2575
2576         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2577         if (rc)
2578                 goto creat_exit;
2579
2580         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2581                 oparms->create_options, oparms->desired_access);
2582
2583         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2584                             &rsp_iov);
2585         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2586
2587         if (rc != 0) {
2588                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2589                 if (err_iov && rsp) {
2590                         *err_iov = rsp_iov;
2591                         *buftype = resp_buftype;
2592                         resp_buftype = CIFS_NO_BUFFER;
2593                         rsp = NULL;
2594                 }
2595                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2596                                     oparms->create_options, oparms->desired_access, rc);
2597                 goto creat_exit;
2598         } else
2599                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2600                                      ses->Suid, oparms->create_options,
2601                                      oparms->desired_access);
2602
2603         atomic_inc(&tcon->num_remote_opens);
2604         oparms->fid->persistent_fid = rsp->PersistentFileId;
2605         oparms->fid->volatile_fid = rsp->VolatileFileId;
2606 #ifdef CONFIG_CIFS_DEBUG2
2607         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2608 #endif /* CIFS_DEBUG2 */
2609
2610         if (buf) {
2611                 memcpy(buf, &rsp->CreationTime, 32);
2612                 buf->AllocationSize = rsp->AllocationSize;
2613                 buf->EndOfFile = rsp->EndofFile;
2614                 buf->Attributes = rsp->FileAttributes;
2615                 buf->NumberOfLinks = cpu_to_le32(1);
2616                 buf->DeletePending = 0;
2617         }
2618
2619
2620         smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
2621                             oparms->fid->lease_key, oplock, buf);
2622 creat_exit:
2623         SMB2_open_free(&rqst);
2624         free_rsp_buf(resp_buftype, rsp);
2625         return rc;
2626 }
2627
2628 int
2629 SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2630                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2631                 bool is_fsctl, char *in_data, u32 indatalen,
2632                 __u32 max_response_size)
2633 {
2634         struct smb2_ioctl_req *req;
2635         struct kvec *iov = rqst->rq_iov;
2636         unsigned int total_len;
2637         int rc;
2638         char *in_data_buf;
2639
2640         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2641         if (rc)
2642                 return rc;
2643
2644         if (indatalen) {
2645                 /*
2646                  * indatalen is usually small at a couple of bytes max, so
2647                  * just allocate through generic pool
2648                  */
2649                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
2650                 if (!in_data_buf) {
2651                         cifs_small_buf_release(req);
2652                         return -ENOMEM;
2653                 }
2654         }
2655
2656         req->CtlCode = cpu_to_le32(opcode);
2657         req->PersistentFileId = persistent_fid;
2658         req->VolatileFileId = volatile_fid;
2659
2660         iov[0].iov_base = (char *)req;
2661         /*
2662          * If no input data, the size of ioctl struct in
2663          * protocol spec still includes a 1 byte data buffer,
2664          * but if input data passed to ioctl, we do not
2665          * want to double count this, so we do not send
2666          * the dummy one byte of data in iovec[0] if sending
2667          * input data (in iovec[1]).
2668          */
2669         if (indatalen) {
2670                 req->InputCount = cpu_to_le32(indatalen);
2671                 /* do not set InputOffset if no input data */
2672                 req->InputOffset =
2673                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2674                 rqst->rq_nvec = 2;
2675                 iov[0].iov_len = total_len - 1;
2676                 iov[1].iov_base = in_data_buf;
2677                 iov[1].iov_len = indatalen;
2678         } else {
2679                 rqst->rq_nvec = 1;
2680                 iov[0].iov_len = total_len;
2681         }
2682
2683         req->OutputOffset = 0;
2684         req->OutputCount = 0; /* MBZ */
2685
2686         /*
2687          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
2688          * We Could increase default MaxOutputResponse, but that could require
2689          * more credits. Windows typically sets this smaller, but for some
2690          * ioctls it may be useful to allow server to send more. No point
2691          * limiting what the server can send as long as fits in one credit
2692          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
2693          * to increase this limit up in the future.
2694          * Note that for snapshot queries that servers like Azure expect that
2695          * the first query be minimal size (and just used to get the number/size
2696          * of previous versions) so response size must be specified as EXACTLY
2697          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2698          * of eight bytes.  Currently that is the only case where we set max
2699          * response size smaller.
2700          */
2701         req->MaxOutputResponse = cpu_to_le32(max_response_size);
2702
2703         if (is_fsctl)
2704                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2705         else
2706                 req->Flags = 0;
2707
2708         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2709         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2710                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2711
2712         return 0;
2713 }
2714
2715 void
2716 SMB2_ioctl_free(struct smb_rqst *rqst)
2717 {
2718         int i;
2719         if (rqst && rqst->rq_iov) {
2720                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2721                 for (i = 1; i < rqst->rq_nvec; i++)
2722                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2723                                 kfree(rqst->rq_iov[i].iov_base);
2724         }
2725 }
2726
2727
2728 /*
2729  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2730  */
2731 int
2732 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2733            u64 volatile_fid, u32 opcode, bool is_fsctl,
2734            char *in_data, u32 indatalen, u32 max_out_data_len,
2735            char **out_data, u32 *plen /* returned data len */)
2736 {
2737         struct smb_rqst rqst;
2738         struct smb2_ioctl_rsp *rsp = NULL;
2739         struct cifs_ses *ses;
2740         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
2741         struct kvec rsp_iov = {NULL, 0};
2742         int resp_buftype = CIFS_NO_BUFFER;
2743         int rc = 0;
2744         int flags = 0;
2745
2746         cifs_dbg(FYI, "SMB2 IOCTL\n");
2747
2748         if (out_data != NULL)
2749                 *out_data = NULL;
2750
2751         /* zero out returned data len, in case of error */
2752         if (plen)
2753                 *plen = 0;
2754
2755         if (tcon)
2756                 ses = tcon->ses;
2757         else
2758                 return -EIO;
2759
2760         if (!ses || !(ses->server))
2761                 return -EIO;
2762
2763         if (smb3_encryption_required(tcon))
2764                 flags |= CIFS_TRANSFORM_REQ;
2765
2766         memset(&rqst, 0, sizeof(struct smb_rqst));
2767         memset(&iov, 0, sizeof(iov));
2768         rqst.rq_iov = iov;
2769         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
2770
2771         rc = SMB2_ioctl_init(tcon, &rqst, persistent_fid, volatile_fid, opcode,
2772                              is_fsctl, in_data, indatalen, max_out_data_len);
2773         if (rc)
2774                 goto ioctl_exit;
2775
2776         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2777                             &rsp_iov);
2778         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2779
2780         if (rc != 0)
2781                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2782                                 ses->Suid, 0, opcode, rc);
2783
2784         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
2785                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2786                 goto ioctl_exit;
2787         } else if (rc == -EINVAL) {
2788                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2789                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2790                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2791                         goto ioctl_exit;
2792                 }
2793         } else if (rc == -E2BIG) {
2794                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
2795                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2796                         goto ioctl_exit;
2797                 }
2798         }
2799
2800         /* check if caller wants to look at return data or just return rc */
2801         if ((plen == NULL) || (out_data == NULL))
2802                 goto ioctl_exit;
2803
2804         *plen = le32_to_cpu(rsp->OutputCount);
2805
2806         /* We check for obvious errors in the output buffer length and offset */
2807         if (*plen == 0)
2808                 goto ioctl_exit; /* server returned no data */
2809         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
2810                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2811                 *plen = 0;
2812                 rc = -EIO;
2813                 goto ioctl_exit;
2814         }
2815
2816         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
2817                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2818                         le32_to_cpu(rsp->OutputOffset));
2819                 *plen = 0;
2820                 rc = -EIO;
2821                 goto ioctl_exit;
2822         }
2823
2824         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
2825                             *plen, GFP_KERNEL);
2826         if (*out_data == NULL) {
2827                 rc = -ENOMEM;
2828                 goto ioctl_exit;
2829         }
2830
2831 ioctl_exit:
2832         SMB2_ioctl_free(&rqst);
2833         free_rsp_buf(resp_buftype, rsp);
2834         return rc;
2835 }
2836
2837 /*
2838  *   Individual callers to ioctl worker function follow
2839  */
2840
2841 int
2842 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2843                      u64 persistent_fid, u64 volatile_fid)
2844 {
2845         int rc;
2846         struct  compress_ioctl fsctl_input;
2847         char *ret_data = NULL;
2848
2849         fsctl_input.CompressionState =
2850                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2851
2852         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2853                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2854                         (char *)&fsctl_input /* data input */,
2855                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
2856                         &ret_data /* out data */, NULL);
2857
2858         cifs_dbg(FYI, "set compression rc %d\n", rc);
2859
2860         return rc;
2861 }
2862
2863 int
2864 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2865                 u64 persistent_fid, u64 volatile_fid)
2866 {
2867         struct smb2_close_req *req;
2868         struct kvec *iov = rqst->rq_iov;
2869         unsigned int total_len;
2870         int rc;
2871
2872         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2873         if (rc)
2874                 return rc;
2875
2876         req->PersistentFileId = persistent_fid;
2877         req->VolatileFileId = volatile_fid;
2878         iov[0].iov_base = (char *)req;
2879         iov[0].iov_len = total_len;
2880
2881         return 0;
2882 }
2883
2884 void
2885 SMB2_close_free(struct smb_rqst *rqst)
2886 {
2887         if (rqst && rqst->rq_iov)
2888                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2889 }
2890
2891 int
2892 SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2893                  u64 persistent_fid, u64 volatile_fid, int flags)
2894 {
2895         struct smb_rqst rqst;
2896         struct smb2_close_rsp *rsp = NULL;
2897         struct cifs_ses *ses = tcon->ses;
2898         struct kvec iov[1];
2899         struct kvec rsp_iov;
2900         int resp_buftype = CIFS_NO_BUFFER;
2901         int rc = 0;
2902
2903         cifs_dbg(FYI, "Close\n");
2904
2905         if (!ses || !(ses->server))
2906                 return -EIO;
2907
2908         if (smb3_encryption_required(tcon))
2909                 flags |= CIFS_TRANSFORM_REQ;
2910
2911         memset(&rqst, 0, sizeof(struct smb_rqst));
2912         memset(&iov, 0, sizeof(iov));
2913         rqst.rq_iov = iov;
2914         rqst.rq_nvec = 1;
2915
2916         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
2917         if (rc)
2918                 goto close_exit;
2919
2920         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2921         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2922
2923         if (rc != 0) {
2924                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2925                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2926                                      rc);
2927                 goto close_exit;
2928         }
2929
2930         atomic_dec(&tcon->num_remote_opens);
2931
2932         /* BB FIXME - decode close response, update inode for caching */
2933
2934 close_exit:
2935         SMB2_close_free(&rqst);
2936         free_rsp_buf(resp_buftype, rsp);
2937         return rc;
2938 }
2939
2940 int
2941 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2942            u64 persistent_fid, u64 volatile_fid)
2943 {
2944         return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2945 }
2946
2947 int
2948 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
2949                   struct kvec *iov, unsigned int min_buf_size)
2950 {
2951         unsigned int smb_len = iov->iov_len;
2952         char *end_of_smb = smb_len + (char *)iov->iov_base;
2953         char *begin_of_buf = offset + (char *)iov->iov_base;
2954         char *end_of_buf = begin_of_buf + buffer_length;
2955
2956
2957         if (buffer_length < min_buf_size) {
2958                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2959                          buffer_length, min_buf_size);
2960                 return -EINVAL;
2961         }
2962
2963         /* check if beyond RFC1001 maximum length */
2964         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2965                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2966                          buffer_length, smb_len);
2967                 return -EINVAL;
2968         }
2969
2970         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2971                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2972                 return -EINVAL;
2973         }
2974
2975         return 0;
2976 }
2977
2978 /*
2979  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2980  * Caller must free buffer.
2981  */
2982 int
2983 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
2984                            struct kvec *iov, unsigned int minbufsize,
2985                            char *data)
2986 {
2987         char *begin_of_buf = offset + (char *)iov->iov_base;
2988         int rc;
2989
2990         if (!data)
2991                 return -EINVAL;
2992
2993         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
2994         if (rc)
2995                 return rc;
2996
2997         memcpy(data, begin_of_buf, buffer_length);
2998
2999         return 0;
3000 }
3001
3002 int
3003 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
3004                      u64 persistent_fid, u64 volatile_fid,
3005                      u8 info_class, u8 info_type, u32 additional_info,
3006                      size_t output_len, size_t input_len, void *input)
3007 {
3008         struct smb2_query_info_req *req;
3009         struct kvec *iov = rqst->rq_iov;
3010         unsigned int total_len;
3011         int rc;
3012
3013         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
3014                              &total_len);
3015         if (rc)
3016                 return rc;
3017
3018         req->InfoType = info_type;
3019         req->FileInfoClass = info_class;
3020         req->PersistentFileId = persistent_fid;
3021         req->VolatileFileId = volatile_fid;
3022         req->AdditionalInformation = cpu_to_le32(additional_info);
3023
3024         req->OutputBufferLength = cpu_to_le32(output_len);
3025         if (input_len) {
3026                 req->InputBufferLength = cpu_to_le32(input_len);
3027                 /* total_len for smb query request never close to le16 max */
3028                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3029                 memcpy(req->Buffer, input, input_len);
3030         }
3031
3032         iov[0].iov_base = (char *)req;
3033         /* 1 for Buffer */
3034         iov[0].iov_len = total_len - 1 + input_len;
3035         return 0;
3036 }
3037
3038 void
3039 SMB2_query_info_free(struct smb_rqst *rqst)
3040 {
3041         if (rqst && rqst->rq_iov)
3042                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3043 }
3044
3045 static int
3046 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3047            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3048            u32 additional_info, size_t output_len, size_t min_len, void **data,
3049                 u32 *dlen)
3050 {
3051         struct smb_rqst rqst;
3052         struct smb2_query_info_rsp *rsp = NULL;
3053         struct kvec iov[1];
3054         struct kvec rsp_iov;
3055         int rc = 0;
3056         int resp_buftype = CIFS_NO_BUFFER;
3057         struct cifs_ses *ses = tcon->ses;
3058         int flags = 0;
3059         bool allocated = false;
3060
3061         cifs_dbg(FYI, "Query Info\n");
3062
3063         if (!ses || !(ses->server))
3064                 return -EIO;
3065
3066         if (smb3_encryption_required(tcon))
3067                 flags |= CIFS_TRANSFORM_REQ;
3068
3069         memset(&rqst, 0, sizeof(struct smb_rqst));
3070         memset(&iov, 0, sizeof(iov));
3071         rqst.rq_iov = iov;
3072         rqst.rq_nvec = 1;
3073
3074         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
3075                                   info_class, info_type, additional_info,
3076                                   output_len, 0, NULL);
3077         if (rc)
3078                 goto qinf_exit;
3079
3080         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3081                                     ses->Suid, info_class, (__u32)info_type);
3082
3083         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3084         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3085
3086         if (rc) {
3087                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3088                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3089                                 ses->Suid, info_class, (__u32)info_type, rc);
3090                 goto qinf_exit;
3091         }
3092
3093         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3094                                 ses->Suid, info_class, (__u32)info_type);
3095
3096         if (dlen) {
3097                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3098                 if (!*data) {
3099                         *data = kmalloc(*dlen, GFP_KERNEL);
3100                         if (!*data) {
3101                                 cifs_dbg(VFS,
3102                                         "Error %d allocating memory for acl\n",
3103                                         rc);
3104                                 *dlen = 0;
3105                                 rc = -ENOMEM;
3106                                 goto qinf_exit;
3107                         }
3108                         allocated = true;
3109                 }
3110         }
3111
3112         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3113                                         le32_to_cpu(rsp->OutputBufferLength),
3114                                         &rsp_iov, min_len, *data);
3115         if (rc && allocated) {
3116                 kfree(*data);
3117                 *data = NULL;
3118                 *dlen = 0;
3119         }
3120
3121 qinf_exit:
3122         SMB2_query_info_free(&rqst);
3123         free_rsp_buf(resp_buftype, rsp);
3124         return rc;
3125 }
3126
3127 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3128         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3129 {
3130         return query_info(xid, tcon, persistent_fid, volatile_fid,
3131                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3132                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3133                           sizeof(struct smb2_file_all_info), (void **)&data,
3134                           NULL);
3135 }
3136
3137 int
3138 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3139                 u64 persistent_fid, u64 volatile_fid,
3140                 void **data, u32 *plen)
3141 {
3142         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
3143         *plen = 0;
3144
3145         return query_info(xid, tcon, persistent_fid, volatile_fid,
3146                           0, SMB2_O_INFO_SECURITY, additional_info,
3147                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3148 }
3149
3150 int
3151 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3152                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3153 {
3154         return query_info(xid, tcon, persistent_fid, volatile_fid,
3155                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3156                           sizeof(struct smb2_file_internal_info),
3157                           sizeof(struct smb2_file_internal_info),
3158                           (void **)&uniqueid, NULL);
3159 }
3160
3161 /*
3162  * This is a no-op for now. We're not really interested in the reply, but
3163  * rather in the fact that the server sent one and that server->lstrp
3164  * gets updated.
3165  *
3166  * FIXME: maybe we should consider checking that the reply matches request?
3167  */
3168 static void
3169 smb2_echo_callback(struct mid_q_entry *mid)
3170 {
3171         struct TCP_Server_Info *server = mid->callback_data;
3172         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3173         struct cifs_credits credits = { .value = 0, .instance = 0 };
3174
3175         if (mid->mid_state == MID_RESPONSE_RECEIVED
3176             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3177                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3178                 credits.instance = server->reconnect_instance;
3179         }
3180
3181         DeleteMidQEntry(mid);
3182         add_credits(server, &credits, CIFS_ECHO_OP);
3183 }
3184
3185 void smb2_reconnect_server(struct work_struct *work)
3186 {
3187         struct TCP_Server_Info *server = container_of(work,
3188                                         struct TCP_Server_Info, reconnect.work);
3189         struct cifs_ses *ses;
3190         struct cifs_tcon *tcon, *tcon2;
3191         struct list_head tmp_list;
3192         int tcon_exist = false;
3193         int rc;
3194         int resched = false;
3195
3196
3197         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3198         mutex_lock(&server->reconnect_mutex);
3199
3200         INIT_LIST_HEAD(&tmp_list);
3201         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3202
3203         spin_lock(&cifs_tcp_ses_lock);
3204         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3205                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3206                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3207                                 tcon->tc_count++;
3208                                 list_add_tail(&tcon->rlist, &tmp_list);
3209                                 tcon_exist = true;
3210                         }
3211                 }
3212                 /*
3213                  * IPC has the same lifetime as its session and uses its
3214                  * refcount.
3215                  */
3216                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3217                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3218                         tcon_exist = true;
3219                         ses->ses_count++;
3220                 }
3221         }
3222         /*
3223          * Get the reference to server struct to be sure that the last call of
3224          * cifs_put_tcon() in the loop below won't release the server pointer.
3225          */
3226         if (tcon_exist)
3227                 server->srv_count++;
3228
3229         spin_unlock(&cifs_tcp_ses_lock);
3230
3231         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3232                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
3233                 if (!rc)
3234                         cifs_reopen_persistent_handles(tcon);
3235                 else
3236                         resched = true;
3237                 list_del_init(&tcon->rlist);
3238                 if (tcon->ipc)
3239                         cifs_put_smb_ses(tcon->ses);
3240                 else
3241                         cifs_put_tcon(tcon);
3242         }
3243
3244         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3245         if (resched)
3246                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3247         mutex_unlock(&server->reconnect_mutex);
3248
3249         /* now we can safely release srv struct */
3250         if (tcon_exist)
3251                 cifs_put_tcp_session(server, 1);
3252 }
3253
3254 int
3255 SMB2_echo(struct TCP_Server_Info *server)
3256 {
3257         struct smb2_echo_req *req;
3258         int rc = 0;
3259         struct kvec iov[1];
3260         struct smb_rqst rqst = { .rq_iov = iov,
3261                                  .rq_nvec = 1 };
3262         unsigned int total_len;
3263
3264         cifs_dbg(FYI, "In echo request\n");
3265
3266         if (server->tcpStatus == CifsNeedNegotiate) {
3267                 /* No need to send echo on newly established connections */
3268                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
3269                 return rc;
3270         }
3271
3272         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
3273         if (rc)
3274                 return rc;
3275
3276         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3277
3278         iov[0].iov_len = total_len;
3279         iov[0].iov_base = (char *)req;
3280
3281         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3282                              server, CIFS_ECHO_OP, NULL);
3283         if (rc)
3284                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3285
3286         cifs_small_buf_release(req);
3287         return rc;
3288 }
3289
3290 void
3291 SMB2_flush_free(struct smb_rqst *rqst)
3292 {
3293         if (rqst && rqst->rq_iov)
3294                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3295 }
3296
3297 int
3298 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3299                 struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid)
3300 {
3301         struct smb2_flush_req *req;
3302         struct kvec *iov = rqst->rq_iov;
3303         unsigned int total_len;
3304         int rc;
3305
3306         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
3307         if (rc)
3308                 return rc;
3309
3310         req->PersistentFileId = persistent_fid;
3311         req->VolatileFileId = volatile_fid;
3312
3313         iov[0].iov_base = (char *)req;
3314         iov[0].iov_len = total_len;
3315
3316         return 0;
3317 }
3318
3319 int
3320 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3321            u64 volatile_fid)
3322 {
3323         struct cifs_ses *ses = tcon->ses;
3324         struct smb_rqst rqst;
3325         struct kvec iov[1];
3326         struct kvec rsp_iov = {NULL, 0};
3327         int resp_buftype = CIFS_NO_BUFFER;
3328         int flags = 0;
3329         int rc = 0;
3330
3331         cifs_dbg(FYI, "flush\n");
3332         if (!ses || !(ses->server))
3333                 return -EIO;
3334
3335         if (smb3_encryption_required(tcon))
3336                 flags |= CIFS_TRANSFORM_REQ;
3337
3338         memset(&rqst, 0, sizeof(struct smb_rqst));
3339         memset(&iov, 0, sizeof(iov));
3340         rqst.rq_iov = iov;
3341         rqst.rq_nvec = 1;
3342
3343         rc = SMB2_flush_init(xid, &rqst, tcon, persistent_fid, volatile_fid);
3344         if (rc)
3345                 goto flush_exit;
3346
3347         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3348
3349         if (rc != 0) {
3350                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3351                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3352                                      rc);
3353         }
3354
3355  flush_exit:
3356         SMB2_flush_free(&rqst);
3357         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3358         return rc;
3359 }
3360
3361 /*
3362  * To form a chain of read requests, any read requests after the first should
3363  * have the end_of_chain boolean set to true.
3364  */
3365 static int
3366 smb2_new_read_req(void **buf, unsigned int *total_len,
3367         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3368         unsigned int remaining_bytes, int request_type)
3369 {
3370         int rc = -EACCES;
3371         struct smb2_read_plain_req *req = NULL;
3372         struct smb2_sync_hdr *shdr;
3373         struct TCP_Server_Info *server;
3374
3375         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
3376                                  total_len);
3377         if (rc)
3378                 return rc;
3379
3380         server = io_parms->tcon->ses->server;
3381         if (server == NULL)
3382                 return -ECONNABORTED;
3383
3384         shdr = &req->sync_hdr;
3385         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3386
3387         req->PersistentFileId = io_parms->persistent_fid;
3388         req->VolatileFileId = io_parms->volatile_fid;
3389         req->ReadChannelInfoOffset = 0; /* reserved */
3390         req->ReadChannelInfoLength = 0; /* reserved */
3391         req->Channel = 0; /* reserved */
3392         req->MinimumCount = 0;
3393         req->Length = cpu_to_le32(io_parms->length);
3394         req->Offset = cpu_to_le64(io_parms->offset);
3395
3396         trace_smb3_read_enter(0 /* xid */,
3397                         io_parms->persistent_fid,
3398                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3399                         io_parms->offset, io_parms->length);
3400 #ifdef CONFIG_CIFS_SMB_DIRECT
3401         /*
3402          * If we want to do a RDMA write, fill in and append
3403          * smbd_buffer_descriptor_v1 to the end of read request
3404          */
3405         if (server->rdma && rdata && !server->sign &&
3406                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3407
3408                 struct smbd_buffer_descriptor_v1 *v1;
3409                 bool need_invalidate =
3410                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3411
3412                 rdata->mr = smbd_register_mr(
3413                                 server->smbd_conn, rdata->pages,
3414                                 rdata->nr_pages, rdata->page_offset,
3415                                 rdata->tailsz, true, need_invalidate);
3416                 if (!rdata->mr)
3417                         return -EAGAIN;
3418
3419                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3420                 if (need_invalidate)
3421                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3422                 req->ReadChannelInfoOffset =
3423                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3424                 req->ReadChannelInfoLength =
3425                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3426                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3427                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3428                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3429                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3430
3431                 *total_len += sizeof(*v1) - 1;
3432         }
3433 #endif
3434         if (request_type & CHAINED_REQUEST) {
3435                 if (!(request_type & END_OF_CHAIN)) {
3436                         /* next 8-byte aligned request */
3437                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3438                         shdr->NextCommand = cpu_to_le32(*total_len);
3439                 } else /* END_OF_CHAIN */
3440                         shdr->NextCommand = 0;
3441                 if (request_type & RELATED_REQUEST) {
3442                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3443                         /*
3444                          * Related requests use info from previous read request
3445                          * in chain.
3446                          */
3447                         shdr->SessionId = 0xFFFFFFFF;
3448                         shdr->TreeId = 0xFFFFFFFF;
3449                         req->PersistentFileId = 0xFFFFFFFF;
3450                         req->VolatileFileId = 0xFFFFFFFF;
3451                 }
3452         }
3453         if (remaining_bytes > io_parms->length)
3454                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3455         else
3456                 req->RemainingBytes = 0;
3457
3458         *buf = req;
3459         return rc;
3460 }
3461
3462 static void
3463 smb2_readv_callback(struct mid_q_entry *mid)
3464 {
3465         struct cifs_readdata *rdata = mid->callback_data;
3466         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3467         struct TCP_Server_Info *server = tcon->ses->server;
3468         struct smb2_sync_hdr *shdr =
3469                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3470         struct cifs_credits credits = { .value = 0, .instance = 0 };
3471         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3472                                  .rq_nvec = 2,
3473                                  .rq_pages = rdata->pages,
3474                                  .rq_offset = rdata->page_offset,
3475                                  .rq_npages = rdata->nr_pages,
3476                                  .rq_pagesz = rdata->pagesz,
3477                                  .rq_tailsz = rdata->tailsz };
3478
3479         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3480                  __func__, mid->mid, mid->mid_state, rdata->result,
3481                  rdata->bytes);
3482
3483         switch (mid->mid_state) {
3484         case MID_RESPONSE_RECEIVED:
3485                 credits.value = le16_to_cpu(shdr->CreditRequest);
3486                 credits.instance = server->reconnect_instance;
3487                 /* result already set, check signature */
3488                 if (server->sign && !mid->decrypted) {
3489                         int rc;
3490
3491                         rc = smb2_verify_signature(&rqst, server);
3492                         if (rc)
3493                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
3494                                          rc);
3495                 }
3496                 /* FIXME: should this be counted toward the initiating task? */
3497                 task_io_account_read(rdata->got_bytes);
3498                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3499                 break;
3500         case MID_REQUEST_SUBMITTED:
3501         case MID_RETRY_NEEDED:
3502                 rdata->result = -EAGAIN;
3503                 if (server->sign && rdata->got_bytes)
3504                         /* reset bytes number since we can not check a sign */
3505                         rdata->got_bytes = 0;
3506                 /* FIXME: should this be counted toward the initiating task? */
3507                 task_io_account_read(rdata->got_bytes);
3508                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3509                 break;
3510         case MID_RESPONSE_MALFORMED:
3511                 credits.value = le16_to_cpu(shdr->CreditRequest);
3512                 credits.instance = server->reconnect_instance;
3513                 /* fall through */
3514         default:
3515                 rdata->result = -EIO;
3516         }
3517 #ifdef CONFIG_CIFS_SMB_DIRECT
3518         /*
3519          * If this rdata has a memmory registered, the MR can be freed
3520          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3521          * because they have limited number and are used for future I/Os
3522          */
3523         if (rdata->mr) {
3524                 smbd_deregister_mr(rdata->mr);
3525                 rdata->mr = NULL;
3526         }
3527 #endif
3528         if (rdata->result && rdata->result != -ENODATA) {
3529                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3530                 trace_smb3_read_err(0 /* xid */,
3531                                     rdata->cfile->fid.persistent_fid,
3532                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3533                                     rdata->bytes, rdata->result);
3534         } else
3535                 trace_smb3_read_done(0 /* xid */,
3536                                      rdata->cfile->fid.persistent_fid,
3537                                      tcon->tid, tcon->ses->Suid,
3538                                      rdata->offset, rdata->got_bytes);
3539
3540         queue_work(cifsiod_wq, &rdata->work);
3541         DeleteMidQEntry(mid);
3542         add_credits(server, &credits, 0);
3543 }
3544
3545 /* smb2_async_readv - send an async read, and set up mid to handle result */
3546 int
3547 smb2_async_readv(struct cifs_readdata *rdata)
3548 {
3549         int rc, flags = 0;
3550         char *buf;
3551         struct smb2_sync_hdr *shdr;
3552         struct cifs_io_parms io_parms;
3553         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3554                                  .rq_nvec = 1 };
3555         struct TCP_Server_Info *server;
3556         unsigned int total_len;
3557
3558         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3559                  __func__, rdata->offset, rdata->bytes);
3560
3561         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3562         io_parms.offset = rdata->offset;
3563         io_parms.length = rdata->bytes;
3564         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3565         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3566         io_parms.pid = rdata->pid;
3567
3568         server = io_parms.tcon->ses->server;
3569
3570         rc = smb2_new_read_req(
3571                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3572         if (rc)
3573                 return rc;
3574
3575         if (smb3_encryption_required(io_parms.tcon))
3576                 flags |= CIFS_TRANSFORM_REQ;
3577
3578         rdata->iov[0].iov_base = buf;
3579         rdata->iov[0].iov_len = total_len;
3580
3581         shdr = (struct smb2_sync_hdr *)buf;
3582
3583         if (rdata->credits.value > 0) {
3584                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3585                                                 SMB2_MAX_BUFFER_SIZE));
3586                 shdr->CreditRequest =
3587                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3588
3589                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
3590                 if (rc)
3591                         goto async_readv_out;
3592
3593                 flags |= CIFS_HAS_CREDITS;
3594         }
3595
3596         kref_get(&rdata->refcount);
3597         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3598                              cifs_readv_receive, smb2_readv_callback,
3599                              smb3_handle_read_data, rdata, flags,
3600                              &rdata->credits);
3601         if (rc) {
3602                 kref_put(&rdata->refcount, cifs_readdata_release);
3603                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3604                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
3605                                     io_parms.tcon->tid,
3606                                     io_parms.tcon->ses->Suid,
3607                                     io_parms.offset, io_parms.length, rc);
3608         }
3609
3610 async_readv_out:
3611         cifs_small_buf_release(buf);
3612         return rc;
3613 }
3614
3615 int
3616 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3617           unsigned int *nbytes, char **buf, int *buf_type)
3618 {
3619         struct smb_rqst rqst;
3620         int resp_buftype, rc = -EACCES;
3621         struct smb2_read_plain_req *req = NULL;
3622         struct smb2_read_rsp *rsp = NULL;
3623         struct kvec iov[1];
3624         struct kvec rsp_iov;
3625         unsigned int total_len;
3626         int flags = CIFS_LOG_ERROR;
3627         struct cifs_ses *ses = io_parms->tcon->ses;
3628
3629         *nbytes = 0;
3630         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3631         if (rc)
3632                 return rc;
3633
3634         if (smb3_encryption_required(io_parms->tcon))
3635                 flags |= CIFS_TRANSFORM_REQ;
3636
3637         iov[0].iov_base = (char *)req;
3638         iov[0].iov_len = total_len;
3639
3640         memset(&rqst, 0, sizeof(struct smb_rqst));
3641         rqst.rq_iov = iov;
3642         rqst.rq_nvec = 1;
3643
3644         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3645         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3646
3647         if (rc) {
3648                 if (rc != -ENODATA) {
3649                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3650                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3651                         trace_smb3_read_err(xid, req->PersistentFileId,
3652                                             io_parms->tcon->tid, ses->Suid,
3653                                             io_parms->offset, io_parms->length,
3654                                             rc);
3655                 } else
3656                         trace_smb3_read_done(xid, req->PersistentFileId,
3657                                     io_parms->tcon->tid, ses->Suid,
3658                                     io_parms->offset, 0);
3659                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3660                 cifs_small_buf_release(req);
3661                 return rc == -ENODATA ? 0 : rc;
3662         } else
3663                 trace_smb3_read_done(xid, req->PersistentFileId,
3664                                     io_parms->tcon->tid, ses->Suid,
3665                                     io_parms->offset, io_parms->length);
3666
3667         cifs_small_buf_release(req);
3668
3669         *nbytes = le32_to_cpu(rsp->DataLength);
3670         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3671             (*nbytes > io_parms->length)) {
3672                 cifs_dbg(FYI, "bad length %d for count %d\n",
3673                          *nbytes, io_parms->length);
3674                 rc = -EIO;
3675                 *nbytes = 0;
3676         }
3677
3678         if (*buf) {
3679                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3680                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3681         } else if (resp_buftype != CIFS_NO_BUFFER) {
3682                 *buf = rsp_iov.iov_base;
3683                 if (resp_buftype == CIFS_SMALL_BUFFER)
3684                         *buf_type = CIFS_SMALL_BUFFER;
3685                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3686                         *buf_type = CIFS_LARGE_BUFFER;
3687         }
3688         return rc;
3689 }
3690
3691 /*
3692  * Check the mid_state and signature on received buffer (if any), and queue the
3693  * workqueue completion task.
3694  */
3695 static void
3696 smb2_writev_callback(struct mid_q_entry *mid)
3697 {
3698         struct cifs_writedata *wdata = mid->callback_data;
3699         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3700         struct TCP_Server_Info *server = tcon->ses->server;
3701         unsigned int written;
3702         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3703         struct cifs_credits credits = { .value = 0, .instance = 0 };
3704
3705         switch (mid->mid_state) {
3706         case MID_RESPONSE_RECEIVED:
3707                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3708                 credits.instance = server->reconnect_instance;
3709                 wdata->result = smb2_check_receive(mid, server, 0);
3710                 if (wdata->result != 0)
3711                         break;
3712
3713                 written = le32_to_cpu(rsp->DataLength);
3714                 /*
3715                  * Mask off high 16 bits when bytes written as returned
3716                  * by the server is greater than bytes requested by the
3717                  * client. OS/2 servers are known to set incorrect
3718                  * CountHigh values.
3719                  */
3720                 if (written > wdata->bytes)
3721                         written &= 0xFFFF;
3722
3723                 if (written < wdata->bytes)
3724                         wdata->result = -ENOSPC;
3725                 else
3726                         wdata->bytes = written;
3727                 break;
3728         case MID_REQUEST_SUBMITTED:
3729         case MID_RETRY_NEEDED:
3730                 wdata->result = -EAGAIN;
3731                 break;
3732         case MID_RESPONSE_MALFORMED:
3733                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3734                 credits.instance = server->reconnect_instance;
3735                 /* fall through */
3736         default:
3737                 wdata->result = -EIO;
3738                 break;
3739         }
3740 #ifdef CONFIG_CIFS_SMB_DIRECT
3741         /*
3742          * If this wdata has a memory registered, the MR can be freed
3743          * The number of MRs available is limited, it's important to recover
3744          * used MR as soon as I/O is finished. Hold MR longer in the later
3745          * I/O process can possibly result in I/O deadlock due to lack of MR
3746          * to send request on I/O retry
3747          */
3748         if (wdata->mr) {
3749                 smbd_deregister_mr(wdata->mr);
3750                 wdata->mr = NULL;
3751         }
3752 #endif
3753         if (wdata->result) {
3754                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3755                 trace_smb3_write_err(0 /* no xid */,
3756                                      wdata->cfile->fid.persistent_fid,
3757                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3758                                      wdata->bytes, wdata->result);
3759         } else
3760                 trace_smb3_write_done(0 /* no xid */,
3761                                       wdata->cfile->fid.persistent_fid,
3762                                       tcon->tid, tcon->ses->Suid,
3763                                       wdata->offset, wdata->bytes);
3764
3765         queue_work(cifsiod_wq, &wdata->work);
3766         DeleteMidQEntry(mid);
3767         add_credits(server, &credits, 0);
3768 }
3769
3770 /* smb2_async_writev - send an async write, and set up mid to handle result */
3771 int
3772 smb2_async_writev(struct cifs_writedata *wdata,
3773                   void (*release)(struct kref *kref))
3774 {
3775         int rc = -EACCES, flags = 0;
3776         struct smb2_write_req *req = NULL;
3777         struct smb2_sync_hdr *shdr;
3778         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3779         struct TCP_Server_Info *server = tcon->ses->server;
3780         struct kvec iov[1];
3781         struct smb_rqst rqst = { };
3782         unsigned int total_len;
3783
3784         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3785         if (rc)
3786                 return rc;
3787
3788         if (smb3_encryption_required(tcon))
3789                 flags |= CIFS_TRANSFORM_REQ;
3790
3791         shdr = (struct smb2_sync_hdr *)req;
3792         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3793
3794         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3795         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3796         req->WriteChannelInfoOffset = 0;
3797         req->WriteChannelInfoLength = 0;
3798         req->Channel = 0;
3799         req->Offset = cpu_to_le64(wdata->offset);
3800         req->DataOffset = cpu_to_le16(
3801                                 offsetof(struct smb2_write_req, Buffer));
3802         req->RemainingBytes = 0;
3803
3804         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
3805                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
3806 #ifdef CONFIG_CIFS_SMB_DIRECT
3807         /*
3808          * If we want to do a server RDMA read, fill in and append
3809          * smbd_buffer_descriptor_v1 to the end of write request
3810          */
3811         if (server->rdma && !server->sign && wdata->bytes >=
3812                 server->smbd_conn->rdma_readwrite_threshold) {
3813
3814                 struct smbd_buffer_descriptor_v1 *v1;
3815                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3816
3817                 wdata->mr = smbd_register_mr(
3818                                 server->smbd_conn, wdata->pages,
3819                                 wdata->nr_pages, wdata->page_offset,
3820                                 wdata->tailsz, false, need_invalidate);
3821                 if (!wdata->mr) {
3822                         rc = -EAGAIN;
3823                         goto async_writev_out;
3824                 }
3825                 req->Length = 0;
3826                 req->DataOffset = 0;
3827                 if (wdata->nr_pages > 1)
3828                         req->RemainingBytes =
3829                                 cpu_to_le32(
3830                                         (wdata->nr_pages - 1) * wdata->pagesz -
3831                                         wdata->page_offset + wdata->tailsz
3832                                 );
3833                 else
3834                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3835                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3836                 if (need_invalidate)
3837                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3838                 req->WriteChannelInfoOffset =
3839                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3840                 req->WriteChannelInfoLength =
3841                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3842                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3843                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3844                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3845                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3846         }
3847 #endif
3848         iov[0].iov_len = total_len - 1;
3849         iov[0].iov_base = (char *)req;
3850
3851         rqst.rq_iov = iov;
3852         rqst.rq_nvec = 1;
3853         rqst.rq_pages = wdata->pages;
3854         rqst.rq_offset = wdata->page_offset;
3855         rqst.rq_npages = wdata->nr_pages;
3856         rqst.rq_pagesz = wdata->pagesz;
3857         rqst.rq_tailsz = wdata->tailsz;
3858 #ifdef CONFIG_CIFS_SMB_DIRECT
3859         if (wdata->mr) {
3860                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3861                 rqst.rq_npages = 0;
3862         }
3863 #endif
3864         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3865                  wdata->offset, wdata->bytes);
3866
3867 #ifdef CONFIG_CIFS_SMB_DIRECT
3868         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3869         if (!wdata->mr)
3870                 req->Length = cpu_to_le32(wdata->bytes);
3871 #else
3872         req->Length = cpu_to_le32(wdata->bytes);
3873 #endif
3874
3875         if (wdata->credits.value > 0) {
3876                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3877                                                     SMB2_MAX_BUFFER_SIZE));
3878                 shdr->CreditRequest =
3879                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3880
3881                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
3882                 if (rc)
3883                         goto async_writev_out;
3884
3885                 flags |= CIFS_HAS_CREDITS;
3886         }
3887
3888         kref_get(&wdata->refcount);
3889         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3890                              wdata, flags, &wdata->credits);
3891
3892         if (rc) {
3893                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
3894                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3895                                      wdata->bytes, rc);
3896                 kref_put(&wdata->refcount, release);
3897                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3898         }
3899
3900 async_writev_out:
3901         cifs_small_buf_release(req);
3902         return rc;
3903 }
3904
3905 /*
3906  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
3907  * The length field from io_parms must be at least 1 and indicates a number of
3908  * elements with data to write that begins with position 1 in iov array. All
3909  * data length is specified by count.
3910  */
3911 int
3912 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
3913            unsigned int *nbytes, struct kvec *iov, int n_vec)
3914 {
3915         struct smb_rqst rqst;
3916         int rc = 0;
3917         struct smb2_write_req *req = NULL;
3918         struct smb2_write_rsp *rsp = NULL;
3919         int resp_buftype;
3920         struct kvec rsp_iov;
3921         int flags = 0;
3922         unsigned int total_len;
3923
3924         *nbytes = 0;
3925
3926         if (n_vec < 1)
3927                 return rc;
3928
3929         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
3930                              &total_len);
3931         if (rc)
3932                 return rc;
3933
3934         if (io_parms->tcon->ses->server == NULL)
3935                 return -ECONNABORTED;
3936
3937         if (smb3_encryption_required(io_parms->tcon))
3938                 flags |= CIFS_TRANSFORM_REQ;
3939
3940         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3941
3942         req->PersistentFileId = io_parms->persistent_fid;
3943         req->VolatileFileId = io_parms->volatile_fid;
3944         req->WriteChannelInfoOffset = 0;
3945         req->WriteChannelInfoLength = 0;
3946         req->Channel = 0;
3947         req->Length = cpu_to_le32(io_parms->length);
3948         req->Offset = cpu_to_le64(io_parms->offset);
3949         req->DataOffset = cpu_to_le16(
3950                                 offsetof(struct smb2_write_req, Buffer));
3951         req->RemainingBytes = 0;
3952
3953         trace_smb3_write_enter(xid, io_parms->persistent_fid,
3954                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3955                 io_parms->offset, io_parms->length);
3956
3957         iov[0].iov_base = (char *)req;
3958         /* 1 for Buffer */
3959         iov[0].iov_len = total_len - 1;
3960
3961         memset(&rqst, 0, sizeof(struct smb_rqst));
3962         rqst.rq_iov = iov;
3963         rqst.rq_nvec = n_vec + 1;
3964
3965         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
3966                             &resp_buftype, flags, &rsp_iov);
3967         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3968
3969         if (rc) {
3970                 trace_smb3_write_err(xid, req->PersistentFileId,
3971                                      io_parms->tcon->tid,
3972                                      io_parms->tcon->ses->Suid,
3973                                      io_parms->offset, io_parms->length, rc);
3974                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3975                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
3976         } else {
3977                 *nbytes = le32_to_cpu(rsp->DataLength);
3978                 trace_smb3_write_done(xid, req->PersistentFileId,
3979                                      io_parms->tcon->tid,
3980                                      io_parms->tcon->ses->Suid,
3981                                      io_parms->offset, *nbytes);
3982         }
3983
3984         cifs_small_buf_release(req);
3985         free_rsp_buf(resp_buftype, rsp);
3986         return rc;
3987 }
3988
3989 static unsigned int
3990 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
3991 {
3992         int len;
3993         unsigned int entrycount = 0;
3994         unsigned int next_offset = 0;
3995         char *entryptr;
3996         FILE_DIRECTORY_INFO *dir_info;
3997
3998         if (bufstart == NULL)
3999                 return 0;
4000
4001         entryptr = bufstart;
4002
4003         while (1) {
4004                 if (entryptr + next_offset < entryptr ||
4005                     entryptr + next_offset > end_of_buf ||
4006                     entryptr + next_offset + size > end_of_buf) {
4007                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4008                         break;
4009                 }
4010
4011                 entryptr = entryptr + next_offset;
4012                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4013
4014                 len = le32_to_cpu(dir_info->FileNameLength);
4015                 if (entryptr + len < entryptr ||
4016                     entryptr + len > end_of_buf ||
4017                     entryptr + len + size > end_of_buf) {
4018                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4019                                  end_of_buf);
4020                         break;
4021                 }
4022
4023                 *lastentry = entryptr;
4024                 entrycount++;
4025
4026                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4027                 if (!next_offset)
4028                         break;
4029         }
4030
4031         return entrycount;
4032 }
4033
4034 /*
4035  * Readdir/FindFirst
4036  */
4037 int
4038 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4039                      u64 persistent_fid, u64 volatile_fid, int index,
4040                      struct cifs_search_info *srch_inf)
4041 {
4042         struct smb_rqst rqst;
4043         struct smb2_query_directory_req *req;
4044         struct smb2_query_directory_rsp *rsp = NULL;
4045         struct kvec iov[2];
4046         struct kvec rsp_iov;
4047         int rc = 0;
4048         int len;
4049         int resp_buftype = CIFS_NO_BUFFER;
4050         unsigned char *bufptr;
4051         struct TCP_Server_Info *server;
4052         struct cifs_ses *ses = tcon->ses;
4053         __le16 asteriks = cpu_to_le16('*');
4054         char *end_of_smb;
4055         unsigned int output_size = CIFSMaxBufSize;
4056         size_t info_buf_size;
4057         int flags = 0;
4058         unsigned int total_len;
4059
4060         if (ses && (ses->server))
4061                 server = ses->server;
4062         else
4063                 return -EIO;
4064
4065         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
4066                              &total_len);
4067         if (rc)
4068                 return rc;
4069
4070         if (smb3_encryption_required(tcon))
4071                 flags |= CIFS_TRANSFORM_REQ;
4072
4073         switch (srch_inf->info_level) {
4074         case SMB_FIND_FILE_DIRECTORY_INFO:
4075                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4076                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4077                 break;
4078         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4079                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4080                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4081                 break;
4082         default:
4083                 cifs_dbg(VFS, "info level %u isn't supported\n",
4084                          srch_inf->info_level);
4085                 rc = -EINVAL;
4086                 goto qdir_exit;
4087         }
4088
4089         req->FileIndex = cpu_to_le32(index);
4090         req->PersistentFileId = persistent_fid;
4091         req->VolatileFileId = volatile_fid;
4092
4093         len = 0x2;
4094         bufptr = req->Buffer;
4095         memcpy(bufptr, &asteriks, len);
4096
4097         req->FileNameOffset =
4098                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4099         req->FileNameLength = cpu_to_le16(len);
4100         /*
4101          * BB could be 30 bytes or so longer if we used SMB2 specific
4102          * buffer lengths, but this is safe and close enough.
4103          */
4104         output_size = min_t(unsigned int, output_size, server->maxBuf);
4105         output_size = min_t(unsigned int, output_size, 2 << 15);
4106         req->OutputBufferLength = cpu_to_le32(output_size);
4107
4108         iov[0].iov_base = (char *)req;
4109         /* 1 for Buffer */
4110         iov[0].iov_len = total_len - 1;
4111
4112         iov[1].iov_base = (char *)(req->Buffer);
4113         iov[1].iov_len = len;
4114
4115         memset(&rqst, 0, sizeof(struct smb_rqst));
4116         rqst.rq_iov = iov;
4117         rqst.rq_nvec = 2;
4118
4119         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4120                         tcon->ses->Suid, index, output_size);
4121
4122         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4123         cifs_small_buf_release(req);
4124         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4125
4126         if (rc) {
4127                 if (rc == -ENODATA &&
4128                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4129                         trace_smb3_query_dir_done(xid, persistent_fid,
4130                                 tcon->tid, tcon->ses->Suid, index, 0);
4131                         srch_inf->endOfSearch = true;
4132                         rc = 0;
4133                 } else {
4134                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4135                                 tcon->ses->Suid, index, 0, rc);
4136                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4137                 }
4138                 goto qdir_exit;
4139         }
4140
4141         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4142                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4143                                info_buf_size);
4144         if (rc) {
4145                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4146                         tcon->ses->Suid, index, 0, rc);
4147                 goto qdir_exit;
4148         }
4149
4150         srch_inf->unicode = true;
4151
4152         if (srch_inf->ntwrk_buf_start) {
4153                 if (srch_inf->smallBuf)
4154                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4155                 else
4156                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4157         }
4158         srch_inf->ntwrk_buf_start = (char *)rsp;
4159         srch_inf->srch_entries_start = srch_inf->last_entry =
4160                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4161         end_of_smb = rsp_iov.iov_len + (char *)rsp;
4162         srch_inf->entries_in_buffer =
4163                         num_entries(srch_inf->srch_entries_start, end_of_smb,
4164                                     &srch_inf->last_entry, info_buf_size);
4165         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4166         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4167                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4168                  srch_inf->srch_entries_start, srch_inf->last_entry);
4169         if (resp_buftype == CIFS_LARGE_BUFFER)
4170                 srch_inf->smallBuf = false;
4171         else if (resp_buftype == CIFS_SMALL_BUFFER)
4172                 srch_inf->smallBuf = true;
4173         else
4174                 cifs_dbg(VFS, "illegal search buffer type\n");
4175
4176         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4177                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4178         return rc;
4179
4180 qdir_exit:
4181         free_rsp_buf(resp_buftype, rsp);
4182         return rc;
4183 }
4184
4185 int
4186 SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
4187                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4188                u8 info_type, u32 additional_info,
4189                 void **data, unsigned int *size)
4190 {
4191         struct smb2_set_info_req *req;
4192         struct kvec *iov = rqst->rq_iov;
4193         unsigned int i, total_len;
4194         int rc;
4195
4196         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
4197         if (rc)
4198                 return rc;
4199
4200         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4201         req->InfoType = info_type;
4202         req->FileInfoClass = info_class;
4203         req->PersistentFileId = persistent_fid;
4204         req->VolatileFileId = volatile_fid;
4205         req->AdditionalInformation = cpu_to_le32(additional_info);
4206
4207         req->BufferOffset =
4208                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4209         req->BufferLength = cpu_to_le32(*size);
4210
4211         memcpy(req->Buffer, *data, *size);
4212         total_len += *size;
4213
4214         iov[0].iov_base = (char *)req;
4215         /* 1 for Buffer */
4216         iov[0].iov_len = total_len - 1;
4217
4218         for (i = 1; i < rqst->rq_nvec; i++) {
4219                 le32_add_cpu(&req->BufferLength, size[i]);
4220                 iov[i].iov_base = (char *)data[i];
4221                 iov[i].iov_len = size[i];
4222         }
4223
4224         return 0;
4225 }
4226
4227 void
4228 SMB2_set_info_free(struct smb_rqst *rqst)
4229 {
4230         if (rqst && rqst->rq_iov)
4231                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4232 }
4233
4234 static int
4235 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4236                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4237                u8 info_type, u32 additional_info, unsigned int num,
4238                 void **data, unsigned int *size)
4239 {
4240         struct smb_rqst rqst;
4241         struct smb2_set_info_rsp *rsp = NULL;
4242         struct kvec *iov;
4243         struct kvec rsp_iov;
4244         int rc = 0;
4245         int resp_buftype;
4246         struct cifs_ses *ses = tcon->ses;
4247         int flags = 0;
4248
4249         if (!ses || !(ses->server))
4250                 return -EIO;
4251
4252         if (!num)
4253                 return -EINVAL;
4254
4255         if (smb3_encryption_required(tcon))
4256                 flags |= CIFS_TRANSFORM_REQ;
4257
4258         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4259         if (!iov)
4260                 return -ENOMEM;
4261
4262         memset(&rqst, 0, sizeof(struct smb_rqst));
4263         rqst.rq_iov = iov;
4264         rqst.rq_nvec = num;
4265
4266         rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid,
4267                                 info_class, info_type, additional_info,
4268                                 data, size);
4269         if (rc) {
4270                 kfree(iov);
4271                 return rc;
4272         }
4273
4274
4275         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
4276                             &rsp_iov);
4277         SMB2_set_info_free(&rqst);
4278         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4279
4280         if (rc != 0) {
4281                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4282                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4283                                 ses->Suid, info_class, (__u32)info_type, rc);
4284         }
4285
4286         free_rsp_buf(resp_buftype, rsp);
4287         kfree(iov);
4288         return rc;
4289 }
4290
4291 int
4292 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4293              u64 volatile_fid, u32 pid, __le64 *eof)
4294 {
4295         struct smb2_file_eof_info info;
4296         void *data;
4297         unsigned int size;
4298
4299         info.EndOfFile = *eof;
4300
4301         data = &info;
4302         size = sizeof(struct smb2_file_eof_info);
4303
4304         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4305                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4306                         0, 1, &data, &size);
4307 }
4308
4309 int
4310 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4311                 u64 persistent_fid, u64 volatile_fid,
4312                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4313 {
4314         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4315                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4316                         1, (void **)&pnntsd, &pacllen);
4317 }
4318
4319 int
4320 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4321             u64 persistent_fid, u64 volatile_fid,
4322             struct smb2_file_full_ea_info *buf, int len)
4323 {
4324         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4325                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4326                 0, 1, (void **)&buf, &len);
4327 }
4328
4329 int
4330 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4331                   const u64 persistent_fid, const u64 volatile_fid,
4332                   __u8 oplock_level)
4333 {
4334         struct smb_rqst rqst;
4335         int rc;
4336         struct smb2_oplock_break *req = NULL;
4337         struct cifs_ses *ses = tcon->ses;
4338         int flags = CIFS_OBREAK_OP;
4339         unsigned int total_len;
4340         struct kvec iov[1];
4341         struct kvec rsp_iov;
4342         int resp_buf_type;
4343
4344         cifs_dbg(FYI, "SMB2_oplock_break\n");
4345         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4346                              &total_len);
4347         if (rc)
4348                 return rc;
4349
4350         if (smb3_encryption_required(tcon))
4351                 flags |= CIFS_TRANSFORM_REQ;
4352
4353         req->VolatileFid = volatile_fid;
4354         req->PersistentFid = persistent_fid;
4355         req->OplockLevel = oplock_level;
4356         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4357
4358         flags |= CIFS_NO_RSP_BUF;
4359
4360         iov[0].iov_base = (char *)req;
4361         iov[0].iov_len = total_len;
4362
4363         memset(&rqst, 0, sizeof(struct smb_rqst));
4364         rqst.rq_iov = iov;
4365         rqst.rq_nvec = 1;
4366
4367         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4368         cifs_small_buf_release(req);
4369
4370         if (rc) {
4371                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4372                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
4373         }
4374
4375         return rc;
4376 }
4377
4378 void
4379 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
4380                              struct kstatfs *kst)
4381 {
4382         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
4383                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
4384         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
4385         kst->f_bfree  = kst->f_bavail =
4386                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
4387         return;
4388 }
4389
4390 static void
4391 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
4392                         struct kstatfs *kst)
4393 {
4394         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
4395         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
4396         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
4397         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
4398                 kst->f_bavail = kst->f_bfree;
4399         else
4400                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
4401         if (response_data->TotalFileNodes != cpu_to_le64(-1))
4402                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
4403         if (response_data->FreeFileNodes != cpu_to_le64(-1))
4404                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
4405
4406         return;
4407 }
4408
4409 static int
4410 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
4411                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
4412 {
4413         int rc;
4414         struct smb2_query_info_req *req;
4415         unsigned int total_len;
4416
4417         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
4418
4419         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
4420                 return -EIO;
4421
4422         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
4423                              &total_len);
4424         if (rc)
4425                 return rc;
4426
4427         req->InfoType = SMB2_O_INFO_FILESYSTEM;
4428         req->FileInfoClass = level;
4429         req->PersistentFileId = persistent_fid;
4430         req->VolatileFileId = volatile_fid;
4431         /* 1 for pad */
4432         req->InputBufferOffset =
4433                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4434         req->OutputBufferLength = cpu_to_le32(
4435                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4436
4437         iov->iov_base = (char *)req;
4438         iov->iov_len = total_len;
4439         return 0;
4440 }
4441
4442 int
4443 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4444               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4445 {
4446         struct smb_rqst rqst;
4447         struct smb2_query_info_rsp *rsp = NULL;
4448         struct kvec iov;
4449         struct kvec rsp_iov;
4450         int rc = 0;
4451         int resp_buftype;
4452         struct cifs_ses *ses = tcon->ses;
4453         FILE_SYSTEM_POSIX_INFO *info = NULL;
4454         int flags = 0;
4455
4456         rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4457                                 sizeof(FILE_SYSTEM_POSIX_INFO),
4458                                 persistent_fid, volatile_fid);
4459         if (rc)
4460                 return rc;
4461
4462         if (smb3_encryption_required(tcon))
4463                 flags |= CIFS_TRANSFORM_REQ;
4464
4465         memset(&rqst, 0, sizeof(struct smb_rqst));
4466         rqst.rq_iov = &iov;
4467         rqst.rq_nvec = 1;
4468
4469         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4470         cifs_small_buf_release(iov.iov_base);
4471         if (rc) {
4472                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4473                 goto posix_qfsinf_exit;
4474         }
4475         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4476
4477         info = (FILE_SYSTEM_POSIX_INFO *)(
4478                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4479         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4480                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4481                                sizeof(FILE_SYSTEM_POSIX_INFO));
4482         if (!rc)
4483                 copy_posix_fs_info_to_kstatfs(info, fsdata);
4484
4485 posix_qfsinf_exit:
4486         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4487         return rc;
4488 }
4489
4490 int
4491 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
4492               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4493 {
4494         struct smb_rqst rqst;
4495         struct smb2_query_info_rsp *rsp = NULL;
4496         struct kvec iov;
4497         struct kvec rsp_iov;
4498         int rc = 0;
4499         int resp_buftype;
4500         struct cifs_ses *ses = tcon->ses;
4501         struct smb2_fs_full_size_info *info = NULL;
4502         int flags = 0;
4503
4504         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
4505                                 sizeof(struct smb2_fs_full_size_info),
4506                                 persistent_fid, volatile_fid);
4507         if (rc)
4508                 return rc;
4509
4510         if (smb3_encryption_required(tcon))
4511                 flags |= CIFS_TRANSFORM_REQ;
4512
4513         memset(&rqst, 0, sizeof(struct smb_rqst));
4514         rqst.rq_iov = &iov;
4515         rqst.rq_nvec = 1;
4516
4517         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4518         cifs_small_buf_release(iov.iov_base);
4519         if (rc) {
4520                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4521                 goto qfsinf_exit;
4522         }
4523         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4524
4525         info = (struct smb2_fs_full_size_info *)(
4526                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4527         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4528                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4529                                sizeof(struct smb2_fs_full_size_info));
4530         if (!rc)
4531                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
4532
4533 qfsinf_exit:
4534         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4535         return rc;
4536 }
4537
4538 int
4539 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4540               u64 persistent_fid, u64 volatile_fid, int level)
4541 {
4542         struct smb_rqst rqst;
4543         struct smb2_query_info_rsp *rsp = NULL;
4544         struct kvec iov;
4545         struct kvec rsp_iov;
4546         int rc = 0;
4547         int resp_buftype, max_len, min_len;
4548         struct cifs_ses *ses = tcon->ses;
4549         unsigned int rsp_len, offset;
4550         int flags = 0;
4551
4552         if (level == FS_DEVICE_INFORMATION) {
4553                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4554                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4555         } else if (level == FS_ATTRIBUTE_INFORMATION) {
4556                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4557                 min_len = MIN_FS_ATTR_INFO_SIZE;
4558         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4559                 max_len = sizeof(struct smb3_fs_ss_info);
4560                 min_len = sizeof(struct smb3_fs_ss_info);
4561         } else if (level == FS_VOLUME_INFORMATION) {
4562                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
4563                 min_len = sizeof(struct smb3_fs_vol_info);
4564         } else {
4565                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4566                 return -EINVAL;
4567         }
4568
4569         rc = build_qfs_info_req(&iov, tcon, level, max_len,
4570                                 persistent_fid, volatile_fid);
4571         if (rc)
4572                 return rc;
4573
4574         if (smb3_encryption_required(tcon))
4575                 flags |= CIFS_TRANSFORM_REQ;
4576
4577         memset(&rqst, 0, sizeof(struct smb_rqst));
4578         rqst.rq_iov = &iov;
4579         rqst.rq_nvec = 1;
4580
4581         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4582         cifs_small_buf_release(iov.iov_base);
4583         if (rc) {
4584                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4585                 goto qfsattr_exit;
4586         }
4587         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4588
4589         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4590         offset = le16_to_cpu(rsp->OutputBufferOffset);
4591         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
4592         if (rc)
4593                 goto qfsattr_exit;
4594
4595         if (level == FS_ATTRIBUTE_INFORMATION)
4596                 memcpy(&tcon->fsAttrInfo, offset
4597                         + (char *)rsp, min_t(unsigned int,
4598                         rsp_len, max_len));
4599         else if (level == FS_DEVICE_INFORMATION)
4600                 memcpy(&tcon->fsDevInfo, offset
4601                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4602         else if (level == FS_SECTOR_SIZE_INFORMATION) {
4603                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4604                         (offset + (char *)rsp);
4605                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4606                 tcon->perf_sector_size =
4607                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4608         } else if (level == FS_VOLUME_INFORMATION) {
4609                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
4610                         (offset + (char *)rsp);
4611                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
4612                 tcon->vol_create_time = vol_info->VolumeCreationTime;
4613         }
4614
4615 qfsattr_exit:
4616         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4617         return rc;
4618 }
4619
4620 int
4621 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4622            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4623            const __u32 num_lock, struct smb2_lock_element *buf)
4624 {
4625         struct smb_rqst rqst;
4626         int rc = 0;
4627         struct smb2_lock_req *req = NULL;
4628         struct kvec iov[2];
4629         struct kvec rsp_iov;
4630         int resp_buf_type;
4631         unsigned int count;
4632         int flags = CIFS_NO_RSP_BUF;
4633         unsigned int total_len;
4634
4635         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4636
4637         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4638         if (rc)
4639                 return rc;
4640
4641         if (smb3_encryption_required(tcon))
4642                 flags |= CIFS_TRANSFORM_REQ;
4643
4644         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4645         req->LockCount = cpu_to_le16(num_lock);
4646
4647         req->PersistentFileId = persist_fid;
4648         req->VolatileFileId = volatile_fid;
4649
4650         count = num_lock * sizeof(struct smb2_lock_element);
4651
4652         iov[0].iov_base = (char *)req;
4653         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4654         iov[1].iov_base = (char *)buf;
4655         iov[1].iov_len = count;
4656
4657         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4658
4659         memset(&rqst, 0, sizeof(struct smb_rqst));
4660         rqst.rq_iov = iov;
4661         rqst.rq_nvec = 2;
4662
4663         rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4664                             &rsp_iov);
4665         cifs_small_buf_release(req);
4666         if (rc) {
4667                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4668                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4669                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4670                                     tcon->ses->Suid, rc);
4671         }
4672
4673         return rc;
4674 }
4675
4676 int
4677 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
4678           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4679           const __u64 length, const __u64 offset, const __u32 lock_flags,
4680           const bool wait)
4681 {
4682         struct smb2_lock_element lock;
4683
4684         lock.Offset = cpu_to_le64(offset);
4685         lock.Length = cpu_to_le64(length);
4686         lock.Flags = cpu_to_le32(lock_flags);
4687         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
4688                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
4689
4690         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
4691 }
4692
4693 int
4694 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
4695                  __u8 *lease_key, const __le32 lease_state)
4696 {
4697         struct smb_rqst rqst;
4698         int rc;
4699         struct smb2_lease_ack *req = NULL;
4700         struct cifs_ses *ses = tcon->ses;
4701         int flags = CIFS_OBREAK_OP;
4702         unsigned int total_len;
4703         struct kvec iov[1];
4704         struct kvec rsp_iov;
4705         int resp_buf_type;
4706         __u64 *please_key_high;
4707         __u64 *please_key_low;
4708
4709         cifs_dbg(FYI, "SMB2_lease_break\n");
4710         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4711                              &total_len);
4712         if (rc)
4713                 return rc;
4714
4715         if (smb3_encryption_required(tcon))
4716                 flags |= CIFS_TRANSFORM_REQ;
4717
4718         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4719         req->StructureSize = cpu_to_le16(36);
4720         total_len += 12;
4721
4722         memcpy(req->LeaseKey, lease_key, 16);
4723         req->LeaseState = lease_state;
4724
4725         flags |= CIFS_NO_RSP_BUF;
4726
4727         iov[0].iov_base = (char *)req;
4728         iov[0].iov_len = total_len;
4729
4730         memset(&rqst, 0, sizeof(struct smb_rqst));
4731         rqst.rq_iov = iov;
4732         rqst.rq_nvec = 1;
4733
4734         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4735         cifs_small_buf_release(req);
4736
4737         please_key_low = (__u64 *)lease_key;
4738         please_key_high = (__u64 *)(lease_key+8);
4739         if (rc) {
4740                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4741                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
4742                         ses->Suid, *please_key_low, *please_key_high, rc);
4743                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
4744         } else
4745                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
4746                         ses->Suid, *please_key_low, *please_key_high);
4747
4748         return rc;
4749 }