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 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 507         /* context size is DataLength + minimal smb2_neg_context */
 508         return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
 509                         sizeof(struct smb2_neg_context), 8) * 8;
 510 }
 511
 512 static void
 513 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 514 {
 515         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 516         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 517         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 518         pneg_ctxt->Name[0] = 0x93;
 519         pneg_ctxt->Name[1] = 0xAD;
 520         pneg_ctxt->Name[2] = 0x25;
 521         pneg_ctxt->Name[3] = 0x50;
 522         pneg_ctxt->Name[4] = 0x9C;
 523         pneg_ctxt->Name[5] = 0xB4;
 524         pneg_ctxt->Name[6] = 0x11;
 525         pneg_ctxt->Name[7] = 0xE7;
 526         pneg_ctxt->Name[8] = 0xB4;
 527         pneg_ctxt->Name[9] = 0x23;
 528         pneg_ctxt->Name[10] = 0x83;
 529         pneg_ctxt->Name[11] = 0xDE;
 530         pneg_ctxt->Name[12] = 0x96;
 531         pneg_ctxt->Name[13] = 0x8B;
 532         pneg_ctxt->Name[14] = 0xCD;
 533         pneg_ctxt->Name[15] = 0x7C;
 534 }
 535
 536 static void
 537 assemble_neg_contexts(struct smb2_negotiate_req *req,
 538                       struct TCP_Server_Info *server, unsigned int *total_len)
 539 {
 540         char *pneg_ctxt = (char *)req;
 541         unsigned int ctxt_len;
 542
 543         if (*total_len > 200) {
 544                 /* In case length corrupted don't want to overrun smb buffer */
 545                 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 546                 return;
 547         }
 548
 549         /*
 550          * round up total_len of fixed part of SMB3 negotiate request to 8
 551          * byte boundary before adding negotiate contexts
 552          */
 553         *total_len = roundup(*total_len, 8);
 554
 555         pneg_ctxt = (*total_len) + (char *)req;
 556         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 557
 558         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 559         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 560         *total_len += ctxt_len;
 561         pneg_ctxt += ctxt_len;
 562
 563         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 564         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 565         *total_len += ctxt_len;
 566         pneg_ctxt += ctxt_len;
 567
 568         if (server->compress_algorithm) {
 569                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 570                                 pneg_ctxt);
 571                 ctxt_len = DIV_ROUND_UP(
 572                         sizeof(struct smb2_compression_capabilities_context),
 573                                 8) * 8;
 574                 *total_len += ctxt_len;
 575                 pneg_ctxt += ctxt_len;
 576                 req->NegotiateContextCount = cpu_to_le16(5);
 577         } else
 578                 req->NegotiateContextCount = cpu_to_le16(4);
 579
 580         ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 581                                         server->hostname);
 582         *total_len += ctxt_len;
 583         pneg_ctxt += ctxt_len;
 584
 585         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 586         *total_len += sizeof(struct smb2_posix_neg_context);
 587 }
 588
 589 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 590 {
 591         unsigned int len = le16_to_cpu(ctxt->DataLength);
 592
 593         /* If invalid preauth context warn but use what we requested, SHA-512 */
 594         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 595                 printk_once(KERN_WARNING "server sent bad preauth context\n");
 596                 return;
 597         }
 598         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 599                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
 600         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 601                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
 602 }
 603
 604 static void decode_compress_ctx(struct TCP_Server_Info *server,
 605                          struct smb2_compression_capabilities_context *ctxt)
 606 {
 607         unsigned int len = le16_to_cpu(ctxt->DataLength);
 608
 609         /* sizeof compress context is a one element compression capbility struct */
 610         if (len < 10) {
 611                 printk_once(KERN_WARNING "server sent bad compression cntxt\n");
 612                 return;
 613         }
 614         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 615                 printk_once(KERN_WARNING "illegal SMB3 compress algorithm count\n");
 616                 return;
 617         }
 618         if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 619                 printk_once(KERN_WARNING "unknown compression algorithm\n");
 620                 return;
 621         }
 622         server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 623 }
 624
 625 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 626                               struct smb2_encryption_neg_context *ctxt)
 627 {
 628         unsigned int len = le16_to_cpu(ctxt->DataLength);
 629
 630         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 631         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 632                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
 633                 return -EINVAL;
 634         }
 635
 636         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 637                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
 638                 return -EINVAL;
 639         }
 640         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 641         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 642             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 643                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
 644                 return -EINVAL;
 645         }
 646         server->cipher_type = ctxt->Ciphers[0];
 647         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 648         return 0;
 649 }
 650
 651 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 652                                      struct TCP_Server_Info *server,
 653                                      unsigned int len_of_smb)
 654 {
 655         struct smb2_neg_context *pctx;
 656         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 657         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 658         unsigned int len_of_ctxts, i;
 659         int rc = 0;
 660
 661         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 662         if (len_of_smb <= offset) {
 663                 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 664                 return -EINVAL;
 665         }
 666
 667         len_of_ctxts = len_of_smb - offset;
 668
 669         for (i = 0; i < ctxt_cnt; i++) {
 670                 int clen;
 671                 /* check that offset is not beyond end of SMB */
 672                 if (len_of_ctxts == 0)
 673                         break;
 674
 675                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 676                         break;
 677
 678                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 679                 clen = le16_to_cpu(pctx->DataLength);
 680                 if (clen > len_of_ctxts)
 681                         break;
 682
 683                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 684                         decode_preauth_context(
 685                                 (struct smb2_preauth_neg_context *)pctx);
 686                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 687                         rc = decode_encrypt_ctx(server,
 688                                 (struct smb2_encryption_neg_context *)pctx);
 689                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 690                         decode_compress_ctx(server,
 691                                 (struct smb2_compression_capabilities_context *)pctx);
 692                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 693                         server->posix_ext_supported = true;
 694                 else
 695                         cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 696                                 le16_to_cpu(pctx->ContextType));
 697
 698                 if (rc)
 699                         break;
 700                 /* offsets must be 8 byte aligned */
 701                 clen = (clen + 7) & ~0x7;
 702                 offset += clen + sizeof(struct smb2_neg_context);
 703                 len_of_ctxts -= clen;
 704         }
 705         return rc;
 706 }
 707
 708 static struct create_posix *
 709 create_posix_buf(umode_t mode)
 710 {
 711         struct create_posix *buf;
 712
 713         buf = kzalloc(sizeof(struct create_posix),
 714                         GFP_KERNEL);
 715         if (!buf)
 716                 return NULL;
 717
 718         buf->ccontext.DataOffset =
 719                 cpu_to_le16(offsetof(struct create_posix, Mode));
 720         buf->ccontext.DataLength = cpu_to_le32(4);
 721         buf->ccontext.NameOffset =
 722                 cpu_to_le16(offsetof(struct create_posix, Name));
 723         buf->ccontext.NameLength = cpu_to_le16(16);
 724
 725         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 726         buf->Name[0] = 0x93;
 727         buf->Name[1] = 0xAD;
 728         buf->Name[2] = 0x25;
 729         buf->Name[3] = 0x50;
 730         buf->Name[4] = 0x9C;
 731         buf->Name[5] = 0xB4;
 732         buf->Name[6] = 0x11;
 733         buf->Name[7] = 0xE7;
 734         buf->Name[8] = 0xB4;
 735         buf->Name[9] = 0x23;
 736         buf->Name[10] = 0x83;
 737         buf->Name[11] = 0xDE;
 738         buf->Name[12] = 0x96;
 739         buf->Name[13] = 0x8B;
 740         buf->Name[14] = 0xCD;
 741         buf->Name[15] = 0x7C;
 742         buf->Mode = cpu_to_le32(mode);
 743         cifs_dbg(FYI, "mode on posix create 0%o", mode);
 744         return buf;
 745 }
 746
 747 static int
 748 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 749 {
 750         struct smb2_create_req *req = iov[0].iov_base;
 751         unsigned int num = *num_iovec;
 752
 753         iov[num].iov_base = create_posix_buf(mode);
 754         if (mode == -1)
 755                 cifs_dbg(VFS, "illegal mode\n"); /* BB REMOVEME */
 756         if (iov[num].iov_base == NULL)
 757                 return -ENOMEM;
 758         iov[num].iov_len = sizeof(struct create_posix);
 759         if (!req->CreateContextsOffset)
 760                 req->CreateContextsOffset = cpu_to_le32(
 761                                 sizeof(struct smb2_create_req) +
 762                                 iov[num - 1].iov_len);
 763         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 764         *num_iovec = num + 1;
 765         return 0;
 766 }
 767
 768
 769 /*
 770  *
 771  *      SMB2 Worker functions follow:
 772  *
 773  *      The general structure of the worker functions is:
 774  *      1) Call smb2_init (assembles SMB2 header)
 775  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 776  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 777  *      4) Decode SMB2 command specific fields in the fixed length area
 778  *      5) Decode variable length data area (if any for this SMB2 command type)
 779  *      6) Call free smb buffer
 780  *      7) return
 781  *
 782  */
 783
 784 int
 785 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 786 {
 787         struct smb_rqst rqst;
 788         struct smb2_negotiate_req *req;
 789         struct smb2_negotiate_rsp *rsp;
 790         struct kvec iov[1];
 791         struct kvec rsp_iov;
 792         int rc = 0;
 793         int resp_buftype;
 794         struct TCP_Server_Info *server = ses->server;
 795         int blob_offset, blob_length;
 796         char *security_blob;
 797         int flags = CIFS_NEG_OP;
 798         unsigned int total_len;
 799
 800         cifs_dbg(FYI, "Negotiate protocol\n");
 801
 802         if (!server) {
 803                 WARN(1, "%s: server is NULL!\n", __func__);
 804                 return -EIO;
 805         }
 806
 807         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 808         if (rc)
 809                 return rc;
 810
 811         req->sync_hdr.SessionId = 0;
 812
 813         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 814         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 815
 816         if (strcmp(ses->server->vals->version_string,
 817                    SMB3ANY_VERSION_STRING) == 0) {
 818                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 819                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 820                 req->DialectCount = cpu_to_le16(2);
 821                 total_len += 4;
 822         } else if (strcmp(server->vals->version_string,
 823                    SMBDEFAULT_VERSION_STRING) == 0) {
 824                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 825                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 826                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 827                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 828                 req->DialectCount = cpu_to_le16(4);
 829                 total_len += 8;
 830         } else {
 831                 /* otherwise send specific dialect */
 832                 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 833                 req->DialectCount = cpu_to_le16(1);
 834                 total_len += 2;
 835         }
 836
 837         /* only one of SMB2 signing flags may be set in SMB2 request */
 838         if (ses->sign)
 839                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 840         else if (global_secflags & CIFSSEC_MAY_SIGN)
 841                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 842         else
 843                 req->SecurityMode = 0;
 844
 845         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
 846
 847         /* ClientGUID must be zero for SMB2.02 dialect */
 848         if (server->vals->protocol_id == SMB20_PROT_ID)
 849                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 850         else {
 851                 memcpy(req->ClientGUID, server->client_guid,
 852                         SMB2_CLIENT_GUID_SIZE);
 853                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
 854                     (strcmp(server->vals->version_string,
 855                      SMBDEFAULT_VERSION_STRING) == 0))
 856                         assemble_neg_contexts(req, server, &total_len);
 857         }
 858         iov[0].iov_base = (char *)req;
 859         iov[0].iov_len = total_len;
 860
 861         memset(&rqst, 0, sizeof(struct smb_rqst));
 862         rqst.rq_iov = iov;
 863         rqst.rq_nvec = 1;
 864
 865         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
 866         cifs_small_buf_release(req);
 867         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 868         /*
 869          * No tcon so can't do
 870          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 871          */
 872         if (rc == -EOPNOTSUPP) {
 873                 cifs_server_dbg(VFS, "Dialect not supported by server. Consider "
 874                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 875                         " older servers\n");
 876                 goto neg_exit;
 877         } else if (rc != 0)
 878                 goto neg_exit;
 879
 880         if (strcmp(server->vals->version_string,
 881                    SMB3ANY_VERSION_STRING) == 0) {
 882                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 883                         cifs_server_dbg(VFS,
 884                                 "SMB2 dialect returned but not requested\n");
 885                         return -EIO;
 886                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 887                         cifs_server_dbg(VFS,
 888                                 "SMB2.1 dialect returned but not requested\n");
 889                         return -EIO;
 890                 }
 891         } else if (strcmp(server->vals->version_string,
 892                    SMBDEFAULT_VERSION_STRING) == 0) {
 893                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 894                         cifs_server_dbg(VFS,
 895                                 "SMB2 dialect returned but not requested\n");
 896                         return -EIO;
 897                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 898                         /* ops set to 3.0 by default for default so update */
 899                         server->ops = &smb21_operations;
 900                         server->vals = &smb21_values;
 901                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 902                         server->ops = &smb311_operations;
 903                         server->vals = &smb311_values;
 904                 }
 905         } else if (le16_to_cpu(rsp->DialectRevision) !=
 906                                 server->vals->protocol_id) {
 907                 /* if requested single dialect ensure returned dialect matched */
 908                 cifs_server_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 909                         le16_to_cpu(rsp->DialectRevision));
 910                 return -EIO;
 911         }
 912
 913         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 914
 915         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 916                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 917         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 918                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 919         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 920                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 921         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 922                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 923         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 924                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 925         else {
 926                 cifs_server_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 927                          le16_to_cpu(rsp->DialectRevision));
 928                 rc = -EIO;
 929                 goto neg_exit;
 930         }
 931         server->dialect = le16_to_cpu(rsp->DialectRevision);
 932
 933         /*
 934          * Keep a copy of the hash after negprot. This hash will be
 935          * the starting hash value for all sessions made from this
 936          * server.
 937          */
 938         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 939                SMB2_PREAUTH_HASH_SIZE);
 940
 941         /* SMB2 only has an extended negflavor */
 942         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 943         /* set it to the maximum buffer size value we can send with 1 credit */
 944         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 945                                SMB2_MAX_BUFFER_SIZE);
 946         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 947         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 948         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 949         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 950                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 951                                 server->sec_mode);
 952         server->capabilities = le32_to_cpu(rsp->Capabilities);
 953         /* Internal types */
 954         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 955
 956         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 957                                                (struct smb2_sync_hdr *)rsp);
 958         /*
 959          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 960          * for us will be
 961          *      ses->sectype = RawNTLMSSP;
 962          * but for time being this is our only auth choice so doesn't matter.
 963          * We just found a server which sets blob length to zero expecting raw.
 964          */
 965         if (blob_length == 0) {
 966                 cifs_dbg(FYI, "missing security blob on negprot\n");
 967                 server->sec_ntlmssp = true;
 968         }
 969
 970         rc = cifs_enable_signing(server, ses->sign);
 971         if (rc)
 972                 goto neg_exit;
 973         if (blob_length) {
 974                 rc = decode_negTokenInit(security_blob, blob_length, server);
 975                 if (rc == 1)
 976                         rc = 0;
 977                 else if (rc == 0)
 978                         rc = -EIO;
 979         }
 980
 981         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 982                 if (rsp->NegotiateContextCount)
 983                         rc = smb311_decode_neg_context(rsp, server,
 984                                                        rsp_iov.iov_len);
 985                 else
 986                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
 987         }
 988 neg_exit:
 989         free_rsp_buf(resp_buftype, rsp);
 990         return rc;
 991 }
 992
 993 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 994 {
 995         int rc;
 996         struct validate_negotiate_info_req *pneg_inbuf;
 997         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 998         u32 rsplen;
 999         u32 inbuflen; /* max of 4 dialects */
1000         struct TCP_Server_Info *server = tcon->ses->server;
1001
1002         cifs_dbg(FYI, "validate negotiate\n");
1003
1004         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1005         if (server->dialect == SMB311_PROT_ID)
1006                 return 0;
1007
1008         /*
1009          * validation ioctl must be signed, so no point sending this if we
1010          * can not sign it (ie are not known user).  Even if signing is not
1011          * required (enabled but not negotiated), in those cases we selectively
1012          * sign just this, the first and only signed request on a connection.
1013          * Having validation of negotiate info  helps reduce attack vectors.
1014          */
1015         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1016                 return 0; /* validation requires signing */
1017
1018         if (tcon->ses->user_name == NULL) {
1019                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1020                 return 0; /* validation requires signing */
1021         }
1022
1023         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1024                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1025
1026         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1027         if (!pneg_inbuf)
1028                 return -ENOMEM;
1029
1030         pneg_inbuf->Capabilities =
1031                         cpu_to_le32(server->vals->req_capabilities);
1032         memcpy(pneg_inbuf->Guid, server->client_guid,
1033                                         SMB2_CLIENT_GUID_SIZE);
1034
1035         if (tcon->ses->sign)
1036                 pneg_inbuf->SecurityMode =
1037                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1038         else if (global_secflags & CIFSSEC_MAY_SIGN)
1039                 pneg_inbuf->SecurityMode =
1040                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1041         else
1042                 pneg_inbuf->SecurityMode = 0;
1043
1044
1045         if (strcmp(server->vals->version_string,
1046                 SMB3ANY_VERSION_STRING) == 0) {
1047                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1048                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1049                 pneg_inbuf->DialectCount = cpu_to_le16(2);
1050                 /* structure is big enough for 3 dialects, sending only 2 */
1051                 inbuflen = sizeof(*pneg_inbuf) -
1052                                 (2 * sizeof(pneg_inbuf->Dialects[0]));
1053         } else if (strcmp(server->vals->version_string,
1054                 SMBDEFAULT_VERSION_STRING) == 0) {
1055                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1056                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1057                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1058                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1059                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1060                 /* structure is big enough for 3 dialects */
1061                 inbuflen = sizeof(*pneg_inbuf);
1062         } else {
1063                 /* otherwise specific dialect was requested */
1064                 pneg_inbuf->Dialects[0] =
1065                         cpu_to_le16(server->vals->protocol_id);
1066                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1067                 /* structure is big enough for 3 dialects, sending only 1 */
1068                 inbuflen = sizeof(*pneg_inbuf) -
1069                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
1070         }
1071
1072         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1073                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1074                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1075                 (char **)&pneg_rsp, &rsplen);
1076         if (rc == -EOPNOTSUPP) {
1077                 /*
1078                  * Old Windows versions or Netapp SMB server can return
1079                  * not supported error. Client should accept it.
1080                  */
1081                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1082                 rc = 0;
1083                 goto out_free_inbuf;
1084         } else if (rc != 0) {
1085                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
1086                 rc = -EIO;
1087                 goto out_free_inbuf;
1088         }
1089
1090         rc = -EIO;
1091         if (rsplen != sizeof(*pneg_rsp)) {
1092                 cifs_tcon_dbg(VFS, "invalid protocol negotiate response size: %d\n",
1093                          rsplen);
1094
1095                 /* relax check since Mac returns max bufsize allowed on ioctl */
1096                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1097                         goto out_free_rsp;
1098         }
1099
1100         /* check validate negotiate info response matches what we got earlier */
1101         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1102                 goto vneg_out;
1103
1104         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1105                 goto vneg_out;
1106
1107         /* do not validate server guid because not saved at negprot time yet */
1108
1109         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1110               SMB2_LARGE_FILES) != server->capabilities)
1111                 goto vneg_out;
1112
1113         /* validate negotiate successful */
1114         rc = 0;
1115         cifs_dbg(FYI, "validate negotiate info successful\n");
1116         goto out_free_rsp;
1117
1118 vneg_out:
1119         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1120 out_free_rsp:
1121         kfree(pneg_rsp);
1122 out_free_inbuf:
1123         kfree(pneg_inbuf);
1124         return rc;
1125 }
1126
1127 enum securityEnum
1128 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1129 {
1130         switch (requested) {
1131         case Kerberos:
1132         case RawNTLMSSP:
1133                 return requested;
1134         case NTLMv2:
1135                 return RawNTLMSSP;
1136         case Unspecified:
1137                 if (server->sec_ntlmssp &&
1138                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1139                         return RawNTLMSSP;
1140                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1141                         (global_secflags & CIFSSEC_MAY_KRB5))
1142                         return Kerberos;
1143                 /* Fallthrough */
1144         default:
1145                 return Unspecified;
1146         }
1147 }
1148
1149 struct SMB2_sess_data {
1150         unsigned int xid;
1151         struct cifs_ses *ses;
1152         struct nls_table *nls_cp;
1153         void (*func)(struct SMB2_sess_data *);
1154         int result;
1155         u64 previous_session;
1156
1157         /* we will send the SMB in three pieces:
1158          * a fixed length beginning part, an optional
1159          * SPNEGO blob (which can be zero length), and a
1160          * last part which will include the strings
1161          * and rest of bcc area. This allows us to avoid
1162          * a large buffer 17K allocation
1163          */
1164         int buf0_type;
1165         struct kvec iov[2];
1166 };
1167
1168 static int
1169 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1170 {
1171         int rc;
1172         struct cifs_ses *ses = sess_data->ses;
1173         struct smb2_sess_setup_req *req;
1174         struct TCP_Server_Info *server = ses->server;
1175         unsigned int total_len;
1176
1177         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
1178                              &total_len);
1179         if (rc)
1180                 return rc;
1181
1182         /* First session, not a reauthenticate */
1183         req->sync_hdr.SessionId = 0;
1184
1185         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
1186         req->PreviousSessionId = sess_data->previous_session;
1187
1188         req->Flags = 0; /* MBZ */
1189
1190         /* enough to enable echos and oplocks and one max size write */
1191         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1192
1193         /* only one of SMB2 signing flags may be set in SMB2 request */
1194         if (server->sign)
1195                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1196         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1197                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1198         else
1199                 req->SecurityMode = 0;
1200
1201 #ifdef CONFIG_CIFS_DFS_UPCALL
1202         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1203 #else
1204         req->Capabilities = 0;
1205 #endif /* DFS_UPCALL */
1206
1207         req->Channel = 0; /* MBZ */
1208
1209         sess_data->iov[0].iov_base = (char *)req;
1210         /* 1 for pad */
1211         sess_data->iov[0].iov_len = total_len - 1;
1212         /*
1213          * This variable will be used to clear the buffer
1214          * allocated above in case of any error in the calling function.
1215          */
1216         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1217
1218         return 0;
1219 }
1220
1221 static void
1222 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1223 {
1224         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1225         sess_data->buf0_type = CIFS_NO_BUFFER;
1226 }
1227
1228 static int
1229 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1230 {
1231         int rc;
1232         struct smb_rqst rqst;
1233         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1234         struct kvec rsp_iov = { NULL, 0 };
1235
1236         /* Testing shows that buffer offset must be at location of Buffer[0] */
1237         req->SecurityBufferOffset =
1238                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1239         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1240
1241         memset(&rqst, 0, sizeof(struct smb_rqst));
1242         rqst.rq_iov = sess_data->iov;
1243         rqst.rq_nvec = 2;
1244
1245         /* BB add code to build os and lm fields */
1246         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1247                             &rqst,
1248                             &sess_data->buf0_type,
1249                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1250         cifs_small_buf_release(sess_data->iov[0].iov_base);
1251         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1252
1253         return rc;
1254 }
1255
1256 static int
1257 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1258 {
1259         int rc = 0;
1260         struct cifs_ses *ses = sess_data->ses;
1261
1262         mutex_lock(&ses->server->srv_mutex);
1263         if (ses->server->ops->generate_signingkey) {
1264                 rc = ses->server->ops->generate_signingkey(ses);
1265                 if (rc) {
1266                         cifs_dbg(FYI,
1267                                 "SMB3 session key generation failed\n");
1268                         mutex_unlock(&ses->server->srv_mutex);
1269                         return rc;
1270                 }
1271         }
1272         if (!ses->server->session_estab) {
1273                 ses->server->sequence_number = 0x2;
1274                 ses->server->session_estab = true;
1275         }
1276         mutex_unlock(&ses->server->srv_mutex);
1277
1278         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1279         spin_lock(&GlobalMid_Lock);
1280         ses->status = CifsGood;
1281         ses->need_reconnect = false;
1282         spin_unlock(&GlobalMid_Lock);
1283         return rc;
1284 }
1285
1286 #ifdef CONFIG_CIFS_UPCALL
1287 static void
1288 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1289 {
1290         int rc;
1291         struct cifs_ses *ses = sess_data->ses;
1292         struct cifs_spnego_msg *msg;
1293         struct key *spnego_key = NULL;
1294         struct smb2_sess_setup_rsp *rsp = NULL;
1295
1296         rc = SMB2_sess_alloc_buffer(sess_data);
1297         if (rc)
1298                 goto out;
1299
1300         spnego_key = cifs_get_spnego_key(ses);
1301         if (IS_ERR(spnego_key)) {
1302                 rc = PTR_ERR(spnego_key);
1303                 spnego_key = NULL;
1304                 goto out;
1305         }
1306
1307         msg = spnego_key->payload.data[0];
1308         /*
1309          * check version field to make sure that cifs.upcall is
1310          * sending us a response in an expected form
1311          */
1312         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1313                 cifs_dbg(VFS,
1314                           "bad cifs.upcall version. Expected %d got %d",
1315                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1316                 rc = -EKEYREJECTED;
1317                 goto out_put_spnego_key;
1318         }
1319
1320         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1321                                          GFP_KERNEL);
1322         if (!ses->auth_key.response) {
1323                 cifs_dbg(VFS,
1324                         "Kerberos can't allocate (%u bytes) memory",
1325                         msg->sesskey_len);
1326                 rc = -ENOMEM;
1327                 goto out_put_spnego_key;
1328         }
1329         ses->auth_key.len = msg->sesskey_len;
1330
1331         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1332         sess_data->iov[1].iov_len = msg->secblob_len;
1333
1334         rc = SMB2_sess_sendreceive(sess_data);
1335         if (rc)
1336                 goto out_put_spnego_key;
1337
1338         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1339         ses->Suid = rsp->sync_hdr.SessionId;
1340
1341         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1342
1343         rc = SMB2_sess_establish_session(sess_data);
1344 out_put_spnego_key:
1345         key_invalidate(spnego_key);
1346         key_put(spnego_key);
1347 out:
1348         sess_data->result = rc;
1349         sess_data->func = NULL;
1350         SMB2_sess_free_buffer(sess_data);
1351 }
1352 #else
1353 static void
1354 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1355 {
1356         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1357         sess_data->result = -EOPNOTSUPP;
1358         sess_data->func = NULL;
1359 }
1360 #endif
1361
1362 static void
1363 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1364
1365 static void
1366 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1367 {
1368         int rc;
1369         struct cifs_ses *ses = sess_data->ses;
1370         struct smb2_sess_setup_rsp *rsp = NULL;
1371         char *ntlmssp_blob = NULL;
1372         bool use_spnego = false; /* else use raw ntlmssp */
1373         u16 blob_length = 0;
1374
1375         /*
1376          * If memory allocation is successful, caller of this function
1377          * frees it.
1378          */
1379         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1380         if (!ses->ntlmssp) {
1381                 rc = -ENOMEM;
1382                 goto out_err;
1383         }
1384         ses->ntlmssp->sesskey_per_smbsess = true;
1385
1386         rc = SMB2_sess_alloc_buffer(sess_data);
1387         if (rc)
1388                 goto out_err;
1389
1390         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1391                                GFP_KERNEL);
1392         if (ntlmssp_blob == NULL) {
1393                 rc = -ENOMEM;
1394                 goto out;
1395         }
1396
1397         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1398         if (use_spnego) {
1399                 /* BB eventually need to add this */
1400                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1401                 rc = -EOPNOTSUPP;
1402                 goto out;
1403         } else {
1404                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1405                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1406         }
1407         sess_data->iov[1].iov_base = ntlmssp_blob;
1408         sess_data->iov[1].iov_len = blob_length;
1409
1410         rc = SMB2_sess_sendreceive(sess_data);
1411         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1412
1413         /* If true, rc here is expected and not an error */
1414         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1415                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1416                 rc = 0;
1417
1418         if (rc)
1419                 goto out;
1420
1421         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1422                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1423                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1424                         le16_to_cpu(rsp->SecurityBufferOffset));
1425                 rc = -EIO;
1426                 goto out;
1427         }
1428         rc = decode_ntlmssp_challenge(rsp->Buffer,
1429                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1430         if (rc)
1431                 goto out;
1432
1433         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1434
1435
1436         ses->Suid = rsp->sync_hdr.SessionId;
1437         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1438
1439 out:
1440         kfree(ntlmssp_blob);
1441         SMB2_sess_free_buffer(sess_data);
1442         if (!rc) {
1443                 sess_data->result = 0;
1444                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1445                 return;
1446         }
1447 out_err:
1448         kfree(ses->ntlmssp);
1449         ses->ntlmssp = NULL;
1450         sess_data->result = rc;
1451         sess_data->func = NULL;
1452 }
1453
1454 static void
1455 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1456 {
1457         int rc;
1458         struct cifs_ses *ses = sess_data->ses;
1459         struct smb2_sess_setup_req *req;
1460         struct smb2_sess_setup_rsp *rsp = NULL;
1461         unsigned char *ntlmssp_blob = NULL;
1462         bool use_spnego = false; /* else use raw ntlmssp */
1463         u16 blob_length = 0;
1464
1465         rc = SMB2_sess_alloc_buffer(sess_data);
1466         if (rc)
1467                 goto out;
1468
1469         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1470         req->sync_hdr.SessionId = ses->Suid;
1471
1472         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1473                                         sess_data->nls_cp);
1474         if (rc) {
1475                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1476                 goto out;
1477         }
1478
1479         if (use_spnego) {
1480                 /* BB eventually need to add this */
1481                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1482                 rc = -EOPNOTSUPP;
1483                 goto out;
1484         }
1485         sess_data->iov[1].iov_base = ntlmssp_blob;
1486         sess_data->iov[1].iov_len = blob_length;
1487
1488         rc = SMB2_sess_sendreceive(sess_data);
1489         if (rc)
1490                 goto out;
1491
1492         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1493
1494         ses->Suid = rsp->sync_hdr.SessionId;
1495         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1496
1497         rc = SMB2_sess_establish_session(sess_data);
1498 out:
1499         kfree(ntlmssp_blob);
1500         SMB2_sess_free_buffer(sess_data);
1501         kfree(ses->ntlmssp);
1502         ses->ntlmssp = NULL;
1503         sess_data->result = rc;
1504         sess_data->func = NULL;
1505 }
1506
1507 static int
1508 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1509 {
1510         int type;
1511
1512         type = smb2_select_sectype(ses->server, ses->sectype);
1513         cifs_dbg(FYI, "sess setup type %d\n", type);
1514         if (type == Unspecified) {
1515                 cifs_dbg(VFS,
1516                         "Unable to select appropriate authentication method!");
1517                 return -EINVAL;
1518         }
1519
1520         switch (type) {
1521         case Kerberos:
1522                 sess_data->func = SMB2_auth_kerberos;
1523                 break;
1524         case RawNTLMSSP:
1525                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1526                 break;
1527         default:
1528                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1529                 return -EOPNOTSUPP;
1530         }
1531
1532         return 0;
1533 }
1534
1535 int
1536 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1537                 const struct nls_table *nls_cp)
1538 {
1539         int rc = 0;
1540         struct TCP_Server_Info *server = ses->server;
1541         struct SMB2_sess_data *sess_data;
1542
1543         cifs_dbg(FYI, "Session Setup\n");
1544
1545         if (!server) {
1546                 WARN(1, "%s: server is NULL!\n", __func__);
1547                 return -EIO;
1548         }
1549
1550         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1551         if (!sess_data)
1552                 return -ENOMEM;
1553
1554         rc = SMB2_select_sec(ses, sess_data);
1555         if (rc)
1556                 goto out;
1557         sess_data->xid = xid;
1558         sess_data->ses = ses;
1559         sess_data->buf0_type = CIFS_NO_BUFFER;
1560         sess_data->nls_cp = (struct nls_table *) nls_cp;
1561         sess_data->previous_session = ses->Suid;
1562
1563         /*
1564          * Initialize the session hash with the server one.
1565          */
1566         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1567                SMB2_PREAUTH_HASH_SIZE);
1568
1569         while (sess_data->func)
1570                 sess_data->func(sess_data);
1571
1572         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1573                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1574         rc = sess_data->result;
1575 out:
1576         kfree(sess_data);
1577         return rc;
1578 }
1579
1580 int
1581 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1582 {
1583         struct smb_rqst rqst;
1584         struct smb2_logoff_req *req; /* response is also trivial struct */
1585         int rc = 0;
1586         struct TCP_Server_Info *server;
1587         int flags = 0;
1588         unsigned int total_len;
1589         struct kvec iov[1];
1590         struct kvec rsp_iov;
1591         int resp_buf_type;
1592
1593         cifs_dbg(FYI, "disconnect session %p\n", ses);
1594
1595         if (ses && (ses->server))
1596                 server = ses->server;
1597         else
1598                 return -EIO;
1599
1600         /* no need to send SMB logoff if uid already closed due to reconnect */
1601         if (ses->need_reconnect)
1602                 goto smb2_session_already_dead;
1603
1604         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1605         if (rc)
1606                 return rc;
1607
1608          /* since no tcon, smb2_init can not do this, so do here */
1609         req->sync_hdr.SessionId = ses->Suid;
1610
1611         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1612                 flags |= CIFS_TRANSFORM_REQ;
1613         else if (server->sign)
1614                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1615
1616         flags |= CIFS_NO_RSP_BUF;
1617
1618         iov[0].iov_base = (char *)req;
1619         iov[0].iov_len = total_len;
1620
1621         memset(&rqst, 0, sizeof(struct smb_rqst));
1622         rqst.rq_iov = iov;
1623         rqst.rq_nvec = 1;
1624
1625         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1626         cifs_small_buf_release(req);
1627         /*
1628          * No tcon so can't do
1629          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1630          */
1631
1632 smb2_session_already_dead:
1633         return rc;
1634 }
1635
1636 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1637 {
1638         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1639 }
1640
1641 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1642
1643 /* These are similar values to what Windows uses */
1644 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1645 {
1646         tcon->max_chunks = 256;
1647         tcon->max_bytes_chunk = 1048576;
1648         tcon->max_bytes_copy = 16777216;
1649 }
1650
1651 int
1652 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1653           struct cifs_tcon *tcon, const struct nls_table *cp)
1654 {
1655         struct smb_rqst rqst;
1656         struct smb2_tree_connect_req *req;
1657         struct smb2_tree_connect_rsp *rsp = NULL;
1658         struct kvec iov[2];
1659         struct kvec rsp_iov = { NULL, 0 };
1660         int rc = 0;
1661         int resp_buftype;
1662         int unc_path_len;
1663         __le16 *unc_path = NULL;
1664         int flags = 0;
1665         unsigned int total_len;
1666         struct TCP_Server_Info *server = ses->server;
1667
1668         cifs_dbg(FYI, "TCON\n");
1669
1670         if (!server || !tree)
1671                 return -EIO;
1672
1673         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1674         if (unc_path == NULL)
1675                 return -ENOMEM;
1676
1677         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1678         unc_path_len *= 2;
1679         if (unc_path_len < 2) {
1680                 kfree(unc_path);
1681                 return -EINVAL;
1682         }
1683
1684         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1685         tcon->tid = 0;
1686         atomic_set(&tcon->num_remote_opens, 0);
1687         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1688                              &total_len);
1689         if (rc) {
1690                 kfree(unc_path);
1691                 return rc;
1692         }
1693
1694         if (smb3_encryption_required(tcon))
1695                 flags |= CIFS_TRANSFORM_REQ;
1696
1697         iov[0].iov_base = (char *)req;
1698         /* 1 for pad */
1699         iov[0].iov_len = total_len - 1;
1700
1701         /* Testing shows that buffer offset must be at location of Buffer[0] */
1702         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1703                         - 1 /* pad */);
1704         req->PathLength = cpu_to_le16(unc_path_len - 2);
1705         iov[1].iov_base = unc_path;
1706         iov[1].iov_len = unc_path_len;
1707
1708         /*
1709          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1710          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1711          * (Samba servers don't always set the flag so also check if null user)
1712          */
1713         if ((server->dialect == SMB311_PROT_ID) &&
1714             !smb3_encryption_required(tcon) &&
1715             !(ses->session_flags &
1716                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1717             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1718                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1719
1720         memset(&rqst, 0, sizeof(struct smb_rqst));
1721         rqst.rq_iov = iov;
1722         rqst.rq_nvec = 2;
1723
1724         /* Need 64 for max size write so ask for more in case not there yet */
1725         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1726
1727         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1728         cifs_small_buf_release(req);
1729         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1730         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1731         if (rc != 0) {
1732                 if (tcon) {
1733                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1734                         tcon->need_reconnect = true;
1735                 }
1736                 goto tcon_error_exit;
1737         }
1738
1739         switch (rsp->ShareType) {
1740         case SMB2_SHARE_TYPE_DISK:
1741                 cifs_dbg(FYI, "connection to disk share\n");
1742                 break;
1743         case SMB2_SHARE_TYPE_PIPE:
1744                 tcon->pipe = true;
1745                 cifs_dbg(FYI, "connection to pipe share\n");
1746                 break;
1747         case SMB2_SHARE_TYPE_PRINT:
1748                 tcon->print = true;
1749                 cifs_dbg(FYI, "connection to printer\n");
1750                 break;
1751         default:
1752                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1753                 rc = -EOPNOTSUPP;
1754                 goto tcon_error_exit;
1755         }
1756
1757         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1758         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1759         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1760         tcon->tidStatus = CifsGood;
1761         tcon->need_reconnect = false;
1762         tcon->tid = rsp->sync_hdr.TreeId;
1763         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1764
1765         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1766             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1767                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1768
1769         if (tcon->seal &&
1770             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1771                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1772
1773         init_copy_chunk_defaults(tcon);
1774         if (server->ops->validate_negotiate)
1775                 rc = server->ops->validate_negotiate(xid, tcon);
1776 tcon_exit:
1777
1778         free_rsp_buf(resp_buftype, rsp);
1779         kfree(unc_path);
1780         return rc;
1781
1782 tcon_error_exit:
1783         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1784                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1785         }
1786         goto tcon_exit;
1787 }
1788
1789 int
1790 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1791 {
1792         struct smb_rqst rqst;
1793         struct smb2_tree_disconnect_req *req; /* response is trivial */
1794         int rc = 0;
1795         struct cifs_ses *ses = tcon->ses;
1796         int flags = 0;
1797         unsigned int total_len;
1798         struct kvec iov[1];
1799         struct kvec rsp_iov;
1800         int resp_buf_type;
1801
1802         cifs_dbg(FYI, "Tree Disconnect\n");
1803
1804         if (!ses || !(ses->server))
1805                 return -EIO;
1806
1807         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1808                 return 0;
1809
1810         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1811                              &total_len);
1812         if (rc)
1813                 return rc;
1814
1815         if (smb3_encryption_required(tcon))
1816                 flags |= CIFS_TRANSFORM_REQ;
1817
1818         flags |= CIFS_NO_RSP_BUF;
1819
1820         iov[0].iov_base = (char *)req;
1821         iov[0].iov_len = total_len;
1822
1823         memset(&rqst, 0, sizeof(struct smb_rqst));
1824         rqst.rq_iov = iov;
1825         rqst.rq_nvec = 1;
1826
1827         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1828         cifs_small_buf_release(req);
1829         if (rc)
1830                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1831
1832         return rc;
1833 }
1834
1835
1836 static struct create_durable *
1837 create_durable_buf(void)
1838 {
1839         struct create_durable *buf;
1840
1841         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1842         if (!buf)
1843                 return NULL;
1844
1845         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1846                                         (struct create_durable, Data));
1847         buf->ccontext.DataLength = cpu_to_le32(16);
1848         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1849                                 (struct create_durable, Name));
1850         buf->ccontext.NameLength = cpu_to_le16(4);
1851         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1852         buf->Name[0] = 'D';
1853         buf->Name[1] = 'H';
1854         buf->Name[2] = 'n';
1855         buf->Name[3] = 'Q';
1856         return buf;
1857 }
1858
1859 static struct create_durable *
1860 create_reconnect_durable_buf(struct cifs_fid *fid)
1861 {
1862         struct create_durable *buf;
1863
1864         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1865         if (!buf)
1866                 return NULL;
1867
1868         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1869                                         (struct create_durable, Data));
1870         buf->ccontext.DataLength = cpu_to_le32(16);
1871         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1872                                 (struct create_durable, Name));
1873         buf->ccontext.NameLength = cpu_to_le16(4);
1874         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1875         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1876         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1877         buf->Name[0] = 'D';
1878         buf->Name[1] = 'H';
1879         buf->Name[2] = 'n';
1880         buf->Name[3] = 'C';
1881         return buf;
1882 }
1883
1884 static void
1885 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
1886 {
1887         struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
1888
1889         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
1890                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
1891         buf->IndexNumber = pdisk_id->DiskFileId;
1892 }
1893
1894 void
1895 smb2_parse_contexts(struct TCP_Server_Info *server,
1896                        struct smb2_create_rsp *rsp,
1897                        unsigned int *epoch, char *lease_key, __u8 *oplock,
1898                        struct smb2_file_all_info *buf)
1899 {
1900         char *data_offset;
1901         struct create_context *cc;
1902         unsigned int next;
1903         unsigned int remaining;
1904         char *name;
1905
1906         *oplock = 0;
1907         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1908         remaining = le32_to_cpu(rsp->CreateContextsLength);
1909         cc = (struct create_context *)data_offset;
1910
1911         /* Initialize inode number to 0 in case no valid data in qfid context */
1912         if (buf)
1913                 buf->IndexNumber = 0;
1914
1915         while (remaining >= sizeof(struct create_context)) {
1916                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1917                 if (le16_to_cpu(cc->NameLength) == 4 &&
1918                     strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
1919                         *oplock = server->ops->parse_lease_buf(cc, epoch,
1920                                                            lease_key);
1921                 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
1922                     strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
1923                         parse_query_id_ctxt(cc, buf);
1924
1925                 next = le32_to_cpu(cc->Next);
1926                 if (!next)
1927                         break;
1928                 remaining -= next;
1929                 cc = (struct create_context *)((char *)cc + next);
1930         }
1931
1932         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
1933                 *oplock = rsp->OplockLevel;
1934
1935         return;
1936 }
1937
1938 static int
1939 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1940                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1941 {
1942         struct smb2_create_req *req = iov[0].iov_base;
1943         unsigned int num = *num_iovec;
1944
1945         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1946         if (iov[num].iov_base == NULL)
1947                 return -ENOMEM;
1948         iov[num].iov_len = server->vals->create_lease_size;
1949         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1950         if (!req->CreateContextsOffset)
1951                 req->CreateContextsOffset = cpu_to_le32(
1952                                 sizeof(struct smb2_create_req) +
1953                                 iov[num - 1].iov_len);
1954         le32_add_cpu(&req->CreateContextsLength,
1955                      server->vals->create_lease_size);
1956         *num_iovec = num + 1;
1957         return 0;
1958 }
1959
1960 static struct create_durable_v2 *
1961 create_durable_v2_buf(struct cifs_open_parms *oparms)
1962 {
1963         struct cifs_fid *pfid = oparms->fid;
1964         struct create_durable_v2 *buf;
1965
1966         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1967         if (!buf)
1968                 return NULL;
1969
1970         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1971                                         (struct create_durable_v2, dcontext));
1972         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1973         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1974                                 (struct create_durable_v2, Name));
1975         buf->ccontext.NameLength = cpu_to_le16(4);
1976
1977         /*
1978          * NB: Handle timeout defaults to 0, which allows server to choose
1979          * (most servers default to 120 seconds) and most clients default to 0.
1980          * This can be overridden at mount ("handletimeout=") if the user wants
1981          * a different persistent (or resilient) handle timeout for all opens
1982          * opens on a particular SMB3 mount.
1983          */
1984         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
1985         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1986         generate_random_uuid(buf->dcontext.CreateGuid);
1987         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1988
1989         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1990         buf->Name[0] = 'D';
1991         buf->Name[1] = 'H';
1992         buf->Name[2] = '2';
1993         buf->Name[3] = 'Q';
1994         return buf;
1995 }
1996
1997 static struct create_durable_handle_reconnect_v2 *
1998 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1999 {
2000         struct create_durable_handle_reconnect_v2 *buf;
2001
2002         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2003                         GFP_KERNEL);
2004         if (!buf)
2005                 return NULL;
2006
2007         buf->ccontext.DataOffset =
2008                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2009                                      dcontext));
2010         buf->ccontext.DataLength =
2011                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2012         buf->ccontext.NameOffset =
2013                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2014                             Name));
2015         buf->ccontext.NameLength = cpu_to_le16(4);
2016
2017         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2018         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2019         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2020         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2021
2022         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2023         buf->Name[0] = 'D';
2024         buf->Name[1] = 'H';
2025         buf->Name[2] = '2';
2026         buf->Name[3] = 'C';
2027         return buf;
2028 }
2029
2030 static int
2031 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2032                     struct cifs_open_parms *oparms)
2033 {
2034         struct smb2_create_req *req = iov[0].iov_base;
2035         unsigned int num = *num_iovec;
2036
2037         iov[num].iov_base = create_durable_v2_buf(oparms);
2038         if (iov[num].iov_base == NULL)
2039                 return -ENOMEM;
2040         iov[num].iov_len = sizeof(struct create_durable_v2);
2041         if (!req->CreateContextsOffset)
2042                 req->CreateContextsOffset =
2043                         cpu_to_le32(sizeof(struct smb2_create_req) +
2044                                                                 iov[1].iov_len);
2045         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2046         *num_iovec = num + 1;
2047         return 0;
2048 }
2049
2050 static int
2051 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2052                     struct cifs_open_parms *oparms)
2053 {
2054         struct smb2_create_req *req = iov[0].iov_base;
2055         unsigned int num = *num_iovec;
2056
2057         /* indicate that we don't need to relock the file */
2058         oparms->reconnect = false;
2059
2060         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2061         if (iov[num].iov_base == NULL)
2062                 return -ENOMEM;
2063         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2064         if (!req->CreateContextsOffset)
2065                 req->CreateContextsOffset =
2066                         cpu_to_le32(sizeof(struct smb2_create_req) +
2067                                                                 iov[1].iov_len);
2068         le32_add_cpu(&req->CreateContextsLength,
2069                         sizeof(struct create_durable_handle_reconnect_v2));
2070         *num_iovec = num + 1;
2071         return 0;
2072 }
2073
2074 static int
2075 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2076                     struct cifs_open_parms *oparms, bool use_persistent)
2077 {
2078         struct smb2_create_req *req = iov[0].iov_base;
2079         unsigned int num = *num_iovec;
2080
2081         if (use_persistent) {
2082                 if (oparms->reconnect)
2083                         return add_durable_reconnect_v2_context(iov, num_iovec,
2084                                                                 oparms);
2085                 else
2086                         return add_durable_v2_context(iov, num_iovec, oparms);
2087         }
2088
2089         if (oparms->reconnect) {
2090                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2091                 /* indicate that we don't need to relock the file */
2092                 oparms->reconnect = false;
2093         } else
2094                 iov[num].iov_base = create_durable_buf();
2095         if (iov[num].iov_base == NULL)
2096                 return -ENOMEM;
2097         iov[num].iov_len = sizeof(struct create_durable);
2098         if (!req->CreateContextsOffset)
2099                 req->CreateContextsOffset =
2100                         cpu_to_le32(sizeof(struct smb2_create_req) +
2101                                                                 iov[1].iov_len);
2102         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2103         *num_iovec = num + 1;
2104         return 0;
2105 }
2106
2107 /* See MS-SMB2 2.2.13.2.7 */
2108 static struct crt_twarp_ctxt *
2109 create_twarp_buf(__u64 timewarp)
2110 {
2111         struct crt_twarp_ctxt *buf;
2112
2113         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2114         if (!buf)
2115                 return NULL;
2116
2117         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2118                                         (struct crt_twarp_ctxt, Timestamp));
2119         buf->ccontext.DataLength = cpu_to_le32(8);
2120         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2121                                 (struct crt_twarp_ctxt, Name));
2122         buf->ccontext.NameLength = cpu_to_le16(4);
2123         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2124         buf->Name[0] = 'T';
2125         buf->Name[1] = 'W';
2126         buf->Name[2] = 'r';
2127         buf->Name[3] = 'p';
2128         buf->Timestamp = cpu_to_le64(timewarp);
2129         return buf;
2130 }
2131
2132 /* See MS-SMB2 2.2.13.2.7 */
2133 static int
2134 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2135 {
2136         struct smb2_create_req *req = iov[0].iov_base;
2137         unsigned int num = *num_iovec;
2138
2139         iov[num].iov_base = create_twarp_buf(timewarp);
2140         if (iov[num].iov_base == NULL)
2141                 return -ENOMEM;
2142         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2143         if (!req->CreateContextsOffset)
2144                 req->CreateContextsOffset = cpu_to_le32(
2145                                 sizeof(struct smb2_create_req) +
2146                                 iov[num - 1].iov_len);
2147         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2148         *num_iovec = num + 1;
2149         return 0;
2150 }
2151
2152 static struct crt_query_id_ctxt *
2153 create_query_id_buf(void)
2154 {
2155         struct crt_query_id_ctxt *buf;
2156
2157         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2158         if (!buf)
2159                 return NULL;
2160
2161         buf->ccontext.DataOffset = cpu_to_le16(0);
2162         buf->ccontext.DataLength = cpu_to_le32(0);
2163         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2164                                 (struct crt_query_id_ctxt, Name));
2165         buf->ccontext.NameLength = cpu_to_le16(4);
2166         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2167         buf->Name[0] = 'Q';
2168         buf->Name[1] = 'F';
2169         buf->Name[2] = 'i';
2170         buf->Name[3] = 'd';
2171         return buf;
2172 }
2173
2174 /* See MS-SMB2 2.2.13.2.9 */
2175 static int
2176 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2177 {
2178         struct smb2_create_req *req = iov[0].iov_base;
2179         unsigned int num = *num_iovec;
2180
2181         iov[num].iov_base = create_query_id_buf();
2182         if (iov[num].iov_base == NULL)
2183                 return -ENOMEM;
2184         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2185         if (!req->CreateContextsOffset)
2186                 req->CreateContextsOffset = cpu_to_le32(
2187                                 sizeof(struct smb2_create_req) +
2188                                 iov[num - 1].iov_len);
2189         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2190         *num_iovec = num + 1;
2191         return 0;
2192 }
2193
2194 static int
2195 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2196                             const char *treename, const __le16 *path)
2197 {
2198         int treename_len, path_len;
2199         struct nls_table *cp;
2200         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2201
2202         /*
2203          * skip leading "\\"
2204          */
2205         treename_len = strlen(treename);
2206         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2207                 return -EINVAL;
2208
2209         treename += 2;
2210         treename_len -= 2;
2211
2212         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2213
2214         /*
2215          * make room for one path separator between the treename and
2216          * path
2217          */
2218         *out_len = treename_len + 1 + path_len;
2219
2220         /*
2221          * final path needs to be null-terminated UTF16 with a
2222          * size aligned to 8
2223          */
2224
2225         *out_size = roundup((*out_len+1)*2, 8);
2226         *out_path = kzalloc(*out_size, GFP_KERNEL);
2227         if (!*out_path)
2228                 return -ENOMEM;
2229
2230         cp = load_nls_default();
2231         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2232         UniStrcat(*out_path, sep);
2233         UniStrcat(*out_path, path);
2234         unload_nls(cp);
2235
2236         return 0;
2237 }
2238
2239 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2240                                umode_t mode, struct cifs_tcon *tcon,
2241                                const char *full_path,
2242                                struct cifs_sb_info *cifs_sb)
2243 {
2244         struct smb_rqst rqst;
2245         struct smb2_create_req *req;
2246         struct smb2_create_rsp *rsp = NULL;
2247         struct cifs_ses *ses = tcon->ses;
2248         struct kvec iov[3]; /* make sure at least one for each open context */
2249         struct kvec rsp_iov = {NULL, 0};
2250         int resp_buftype;
2251         int uni_path_len;
2252         __le16 *copy_path = NULL;
2253         int copy_size;
2254         int rc = 0;
2255         unsigned int n_iov = 2;
2256         __u32 file_attributes = 0;
2257         char *pc_buf = NULL;
2258         int flags = 0;
2259         unsigned int total_len;
2260         __le16 *utf16_path = NULL;
2261
2262         cifs_dbg(FYI, "mkdir\n");
2263
2264         /* resource #1: path allocation */
2265         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2266         if (!utf16_path)
2267                 return -ENOMEM;
2268
2269         if (!ses || !(ses->server)) {
2270                 rc = -EIO;
2271                 goto err_free_path;
2272         }
2273
2274         /* resource #2: request */
2275         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2276         if (rc)
2277                 goto err_free_path;
2278
2279
2280         if (smb3_encryption_required(tcon))
2281                 flags |= CIFS_TRANSFORM_REQ;
2282
2283         req->ImpersonationLevel = IL_IMPERSONATION;
2284         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2285         /* File attributes ignored on open (used in create though) */
2286         req->FileAttributes = cpu_to_le32(file_attributes);
2287         req->ShareAccess = FILE_SHARE_ALL_LE;
2288         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2289         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2290
2291         iov[0].iov_base = (char *)req;
2292         /* -1 since last byte is buf[0] which is sent below (path) */
2293         iov[0].iov_len = total_len - 1;
2294
2295         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2296
2297         /* [MS-SMB2] 2.2.13 NameOffset:
2298          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2299          * the SMB2 header, the file name includes a prefix that will
2300          * be processed during DFS name normalization as specified in
2301          * section 3.3.5.9. Otherwise, the file name is relative to
2302          * the share that is identified by the TreeId in the SMB2
2303          * header.
2304          */
2305         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2306                 int name_len;
2307
2308                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2309                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2310                                                  &name_len,
2311                                                  tcon->treeName, utf16_path);
2312                 if (rc)
2313                         goto err_free_req;
2314
2315                 req->NameLength = cpu_to_le16(name_len * 2);
2316                 uni_path_len = copy_size;
2317                 /* free before overwriting resource */
2318                 kfree(utf16_path);
2319                 utf16_path = copy_path;
2320         } else {
2321                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2322                 /* MUST set path len (NameLength) to 0 opening root of share */
2323                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2324                 if (uni_path_len % 8 != 0) {
2325                         copy_size = roundup(uni_path_len, 8);
2326                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2327                         if (!copy_path) {
2328                                 rc = -ENOMEM;
2329                                 goto err_free_req;
2330                         }
2331                         memcpy((char *)copy_path, (const char *)utf16_path,
2332                                uni_path_len);
2333                         uni_path_len = copy_size;
2334                         /* free before overwriting resource */
2335                         kfree(utf16_path);
2336                         utf16_path = copy_path;
2337                 }
2338         }
2339
2340         iov[1].iov_len = uni_path_len;
2341         iov[1].iov_base = utf16_path;
2342         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2343
2344         if (tcon->posix_extensions) {
2345                 /* resource #3: posix buf */
2346                 rc = add_posix_context(iov, &n_iov, mode);
2347                 if (rc)
2348                         goto err_free_req;
2349                 pc_buf = iov[n_iov-1].iov_base;
2350         }
2351
2352
2353         memset(&rqst, 0, sizeof(struct smb_rqst));
2354         rqst.rq_iov = iov;
2355         rqst.rq_nvec = n_iov;
2356
2357         /* no need to inc num_remote_opens because we close it just below */
2358         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2359                                     FILE_WRITE_ATTRIBUTES);
2360         /* resource #4: response buffer */
2361         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2362         if (rc) {
2363                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2364                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2365                                            CREATE_NOT_FILE,
2366                                            FILE_WRITE_ATTRIBUTES, rc);
2367                 goto err_free_rsp_buf;
2368         }
2369
2370         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2371         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2372                                     ses->Suid, CREATE_NOT_FILE,
2373                                     FILE_WRITE_ATTRIBUTES);
2374
2375         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2376
2377         /* Eventually save off posix specific response info and timestaps */
2378
2379 err_free_rsp_buf:
2380         free_rsp_buf(resp_buftype, rsp);
2381         kfree(pc_buf);
2382 err_free_req:
2383         cifs_small_buf_release(req);
2384 err_free_path:
2385         kfree(utf16_path);
2386         return rc;
2387 }
2388
2389 int
2390 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2391                struct cifs_open_parms *oparms, __le16 *path)
2392 {
2393         struct TCP_Server_Info *server = tcon->ses->server;
2394         struct smb2_create_req *req;
2395         unsigned int n_iov = 2;
2396         __u32 file_attributes = 0;
2397         int copy_size;
2398         int uni_path_len;
2399         unsigned int total_len;
2400         struct kvec *iov = rqst->rq_iov;
2401         __le16 *copy_path;
2402         int rc;
2403
2404         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2405         if (rc)
2406                 return rc;
2407
2408         iov[0].iov_base = (char *)req;
2409         /* -1 since last byte is buf[0] which is sent below (path) */
2410         iov[0].iov_len = total_len - 1;
2411
2412         if (oparms->create_options & CREATE_OPTION_READONLY)
2413                 file_attributes |= ATTR_READONLY;
2414         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2415                 file_attributes |= ATTR_SYSTEM;
2416
2417         req->ImpersonationLevel = IL_IMPERSONATION;
2418         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2419         /* File attributes ignored on open (used in create though) */
2420         req->FileAttributes = cpu_to_le32(file_attributes);
2421         req->ShareAccess = FILE_SHARE_ALL_LE;
2422
2423         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2424         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2425         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2426
2427         /* [MS-SMB2] 2.2.13 NameOffset:
2428          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2429          * the SMB2 header, the file name includes a prefix that will
2430          * be processed during DFS name normalization as specified in
2431          * section 3.3.5.9. Otherwise, the file name is relative to
2432          * the share that is identified by the TreeId in the SMB2
2433          * header.
2434          */
2435         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2436                 int name_len;
2437
2438                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2439                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2440                                                  &name_len,
2441                                                  tcon->treeName, path);
2442                 if (rc)
2443                         return rc;
2444                 req->NameLength = cpu_to_le16(name_len * 2);
2445                 uni_path_len = copy_size;
2446                 path = copy_path;
2447         } else {
2448                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2449                 /* MUST set path len (NameLength) to 0 opening root of share */
2450                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2451                 copy_size = uni_path_len;
2452                 if (copy_size % 8 != 0)
2453                         copy_size = roundup(copy_size, 8);
2454                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2455                 if (!copy_path)
2456                         return -ENOMEM;
2457                 memcpy((char *)copy_path, (const char *)path,
2458                        uni_path_len);
2459                 uni_path_len = copy_size;
2460                 path = copy_path;
2461         }
2462
2463         iov[1].iov_len = uni_path_len;
2464         iov[1].iov_base = path;
2465
2466         if ((!server->oplocks) || (tcon->no_lease))
2467                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2468
2469         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2470             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2471                 req->RequestedOplockLevel = *oplock;
2472         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2473                   (oparms->create_options & CREATE_NOT_FILE))
2474                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2475         else {
2476                 rc = add_lease_context(server, iov, &n_iov,
2477                                        oparms->fid->lease_key, oplock);
2478                 if (rc)
2479                         return rc;
2480         }
2481
2482         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2483                 /* need to set Next field of lease context if we request it */
2484                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2485                         struct create_context *ccontext =
2486                             (struct create_context *)iov[n_iov-1].iov_base;
2487                         ccontext->Next =
2488                                 cpu_to_le32(server->vals->create_lease_size);
2489                 }
2490
2491                 rc = add_durable_context(iov, &n_iov, oparms,
2492                                         tcon->use_persistent);
2493                 if (rc)
2494                         return rc;
2495         }
2496
2497         if (tcon->posix_extensions) {
2498                 if (n_iov > 2) {
2499                         struct create_context *ccontext =
2500                             (struct create_context *)iov[n_iov-1].iov_base;
2501                         ccontext->Next =
2502                                 cpu_to_le32(iov[n_iov-1].iov_len);
2503                 }
2504
2505                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2506                 if (rc)
2507                         return rc;
2508         }
2509
2510         if (tcon->snapshot_time) {
2511                 cifs_dbg(FYI, "adding snapshot context\n");
2512                 if (n_iov > 2) {
2513                         struct create_context *ccontext =
2514                             (struct create_context *)iov[n_iov-1].iov_base;
2515                         ccontext->Next =
2516                                 cpu_to_le32(iov[n_iov-1].iov_len);
2517                 }
2518
2519                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2520                 if (rc)
2521                         return rc;
2522         }
2523
2524         /* TODO: add handling for the mode on create */
2525         if (oparms->disposition == FILE_CREATE)
2526                 cifs_dbg(VFS, "mode is 0x%x\n", oparms->mode); /* BB REMOVEME */
2527
2528         if ((oparms->disposition == FILE_CREATE) && (oparms->mode != -1)) {
2529                 if (n_iov > 2) {
2530                         struct create_context *ccontext =
2531                             (struct create_context *)iov[n_iov-1].iov_base;
2532                         ccontext->Next =
2533                                 cpu_to_le32(iov[n_iov-1].iov_len);
2534                 }
2535
2536                 /* rc = add_sd_context(iov, &n_iov, oparms->mode); */
2537                 if (rc)
2538                         return rc;
2539         }
2540
2541         if (n_iov > 2) {
2542                 struct create_context *ccontext =
2543                         (struct create_context *)iov[n_iov-1].iov_base;
2544                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2545         }
2546         add_query_id_context(iov, &n_iov);
2547
2548         rqst->rq_nvec = n_iov;
2549         return 0;
2550 }
2551
2552 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2553  * All other vectors are freed by kfree().
2554  */
2555 void
2556 SMB2_open_free(struct smb_rqst *rqst)
2557 {
2558         int i;
2559
2560         if (rqst && rqst->rq_iov) {
2561                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2562                 for (i = 1; i < rqst->rq_nvec; i++)
2563                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2564                                 kfree(rqst->rq_iov[i].iov_base);
2565         }
2566 }
2567
2568 int
2569 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2570           __u8 *oplock, struct smb2_file_all_info *buf,
2571           struct kvec *err_iov, int *buftype)
2572 {
2573         struct smb_rqst rqst;
2574         struct smb2_create_rsp *rsp = NULL;
2575         struct TCP_Server_Info *server;
2576         struct cifs_tcon *tcon = oparms->tcon;
2577         struct cifs_ses *ses = tcon->ses;
2578         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2579         struct kvec rsp_iov = {NULL, 0};
2580         int resp_buftype = CIFS_NO_BUFFER;
2581         int rc = 0;
2582         int flags = 0;
2583
2584         cifs_dbg(FYI, "create/open\n");
2585         if (ses && (ses->server))
2586                 server = ses->server;
2587         else
2588                 return -EIO;
2589
2590         if (smb3_encryption_required(tcon))
2591                 flags |= CIFS_TRANSFORM_REQ;
2592
2593         memset(&rqst, 0, sizeof(struct smb_rqst));
2594         memset(&iov, 0, sizeof(iov));
2595         rqst.rq_iov = iov;
2596         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2597
2598         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2599         if (rc)
2600                 goto creat_exit;
2601
2602         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2603                 oparms->create_options, oparms->desired_access);
2604
2605         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2606                             &rsp_iov);
2607         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2608
2609         if (rc != 0) {
2610                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2611                 if (err_iov && rsp) {
2612                         *err_iov = rsp_iov;
2613                         *buftype = resp_buftype;
2614                         resp_buftype = CIFS_NO_BUFFER;
2615                         rsp = NULL;
2616                 }
2617                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2618                                     oparms->create_options, oparms->desired_access, rc);
2619                 if (rc == -EREMCHG) {
2620                         printk_once(KERN_WARNING "server share %s deleted\n",
2621                                     tcon->treeName);
2622                         tcon->need_reconnect = true;
2623                 }
2624                 goto creat_exit;
2625         } else
2626                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2627                                      ses->Suid, oparms->create_options,
2628                                      oparms->desired_access);
2629
2630         atomic_inc(&tcon->num_remote_opens);
2631         oparms->fid->persistent_fid = rsp->PersistentFileId;
2632         oparms->fid->volatile_fid = rsp->VolatileFileId;
2633 #ifdef CONFIG_CIFS_DEBUG2
2634         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2635 #endif /* CIFS_DEBUG2 */
2636
2637         if (buf) {
2638                 memcpy(buf, &rsp->CreationTime, 32);
2639                 buf->AllocationSize = rsp->AllocationSize;
2640                 buf->EndOfFile = rsp->EndofFile;
2641                 buf->Attributes = rsp->FileAttributes;
2642                 buf->NumberOfLinks = cpu_to_le32(1);
2643                 buf->DeletePending = 0;
2644         }
2645
2646
2647         smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
2648                             oparms->fid->lease_key, oplock, buf);
2649 creat_exit:
2650         SMB2_open_free(&rqst);
2651         free_rsp_buf(resp_buftype, rsp);
2652         return rc;
2653 }
2654
2655 int
2656 SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2657                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2658                 bool is_fsctl, char *in_data, u32 indatalen,
2659                 __u32 max_response_size)
2660 {
2661         struct smb2_ioctl_req *req;
2662         struct kvec *iov = rqst->rq_iov;
2663         unsigned int total_len;
2664         int rc;
2665         char *in_data_buf;
2666
2667         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2668         if (rc)
2669                 return rc;
2670
2671         if (indatalen) {
2672                 /*
2673                  * indatalen is usually small at a couple of bytes max, so
2674                  * just allocate through generic pool
2675                  */
2676                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
2677                 if (!in_data_buf) {
2678                         cifs_small_buf_release(req);
2679                         return -ENOMEM;
2680                 }
2681         }
2682
2683         req->CtlCode = cpu_to_le32(opcode);
2684         req->PersistentFileId = persistent_fid;
2685         req->VolatileFileId = volatile_fid;
2686
2687         iov[0].iov_base = (char *)req;
2688         /*
2689          * If no input data, the size of ioctl struct in
2690          * protocol spec still includes a 1 byte data buffer,
2691          * but if input data passed to ioctl, we do not
2692          * want to double count this, so we do not send
2693          * the dummy one byte of data in iovec[0] if sending
2694          * input data (in iovec[1]).
2695          */
2696         if (indatalen) {
2697                 req->InputCount = cpu_to_le32(indatalen);
2698                 /* do not set InputOffset if no input data */
2699                 req->InputOffset =
2700                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2701                 rqst->rq_nvec = 2;
2702                 iov[0].iov_len = total_len - 1;
2703                 iov[1].iov_base = in_data_buf;
2704                 iov[1].iov_len = indatalen;
2705         } else {
2706                 rqst->rq_nvec = 1;
2707                 iov[0].iov_len = total_len;
2708         }
2709
2710         req->OutputOffset = 0;
2711         req->OutputCount = 0; /* MBZ */
2712
2713         /*
2714          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
2715          * We Could increase default MaxOutputResponse, but that could require
2716          * more credits. Windows typically sets this smaller, but for some
2717          * ioctls it may be useful to allow server to send more. No point
2718          * limiting what the server can send as long as fits in one credit
2719          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
2720          * to increase this limit up in the future.
2721          * Note that for snapshot queries that servers like Azure expect that
2722          * the first query be minimal size (and just used to get the number/size
2723          * of previous versions) so response size must be specified as EXACTLY
2724          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2725          * of eight bytes.  Currently that is the only case where we set max
2726          * response size smaller.
2727          */
2728         req->MaxOutputResponse = cpu_to_le32(max_response_size);
2729
2730         if (is_fsctl)
2731                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2732         else
2733                 req->Flags = 0;
2734
2735         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2736         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2737                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2738
2739         return 0;
2740 }
2741
2742 void
2743 SMB2_ioctl_free(struct smb_rqst *rqst)
2744 {
2745         int i;
2746         if (rqst && rqst->rq_iov) {
2747                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2748                 for (i = 1; i < rqst->rq_nvec; i++)
2749                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2750                                 kfree(rqst->rq_iov[i].iov_base);
2751         }
2752 }
2753
2754
2755 /*
2756  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2757  */
2758 int
2759 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2760            u64 volatile_fid, u32 opcode, bool is_fsctl,
2761            char *in_data, u32 indatalen, u32 max_out_data_len,
2762            char **out_data, u32 *plen /* returned data len */)
2763 {
2764         struct smb_rqst rqst;
2765         struct smb2_ioctl_rsp *rsp = NULL;
2766         struct cifs_ses *ses;
2767         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
2768         struct kvec rsp_iov = {NULL, 0};
2769         int resp_buftype = CIFS_NO_BUFFER;
2770         int rc = 0;
2771         int flags = 0;
2772         struct TCP_Server_Info *server;
2773
2774         cifs_dbg(FYI, "SMB2 IOCTL\n");
2775
2776         if (out_data != NULL)
2777                 *out_data = NULL;
2778
2779         /* zero out returned data len, in case of error */
2780         if (plen)
2781                 *plen = 0;
2782
2783         if (tcon)
2784                 ses = tcon->ses;
2785         else
2786                 return -EIO;
2787
2788         if (!ses)
2789                 return -EIO;
2790         server = ses->server;
2791         if (!server)
2792                 return -EIO;
2793
2794         if (smb3_encryption_required(tcon))
2795                 flags |= CIFS_TRANSFORM_REQ;
2796
2797         memset(&rqst, 0, sizeof(struct smb_rqst));
2798         memset(&iov, 0, sizeof(iov));
2799         rqst.rq_iov = iov;
2800         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
2801
2802         rc = SMB2_ioctl_init(tcon, &rqst, persistent_fid, volatile_fid, opcode,
2803                              is_fsctl, in_data, indatalen, max_out_data_len);
2804         if (rc)
2805                 goto ioctl_exit;
2806
2807         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2808                             &rsp_iov);
2809         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2810
2811         if (rc != 0)
2812                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2813                                 ses->Suid, 0, opcode, rc);
2814
2815         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
2816                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2817                 goto ioctl_exit;
2818         } else if (rc == -EINVAL) {
2819                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2820                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2821                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2822                         goto ioctl_exit;
2823                 }
2824         } else if (rc == -E2BIG) {
2825                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
2826                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2827                         goto ioctl_exit;
2828                 }
2829         }
2830
2831         /* check if caller wants to look at return data or just return rc */
2832         if ((plen == NULL) || (out_data == NULL))
2833                 goto ioctl_exit;
2834
2835         *plen = le32_to_cpu(rsp->OutputCount);
2836
2837         /* We check for obvious errors in the output buffer length and offset */
2838         if (*plen == 0)
2839                 goto ioctl_exit; /* server returned no data */
2840         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
2841                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2842                 *plen = 0;
2843                 rc = -EIO;
2844                 goto ioctl_exit;
2845         }
2846
2847         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
2848                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2849                         le32_to_cpu(rsp->OutputOffset));
2850                 *plen = 0;
2851                 rc = -EIO;
2852                 goto ioctl_exit;
2853         }
2854
2855         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
2856                             *plen, GFP_KERNEL);
2857         if (*out_data == NULL) {
2858                 rc = -ENOMEM;
2859                 goto ioctl_exit;
2860         }
2861
2862 ioctl_exit:
2863         SMB2_ioctl_free(&rqst);
2864         free_rsp_buf(resp_buftype, rsp);
2865         return rc;
2866 }
2867
2868 /*
2869  *   Individual callers to ioctl worker function follow
2870  */
2871
2872 int
2873 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2874                      u64 persistent_fid, u64 volatile_fid)
2875 {
2876         int rc;
2877         struct  compress_ioctl fsctl_input;
2878         char *ret_data = NULL;
2879
2880         fsctl_input.CompressionState =
2881                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2882
2883         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2884                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2885                         (char *)&fsctl_input /* data input */,
2886                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
2887                         &ret_data /* out data */, NULL);
2888
2889         cifs_dbg(FYI, "set compression rc %d\n", rc);
2890
2891         return rc;
2892 }
2893
2894 int
2895 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2896                 u64 persistent_fid, u64 volatile_fid)
2897 {
2898         struct smb2_close_req *req;
2899         struct kvec *iov = rqst->rq_iov;
2900         unsigned int total_len;
2901         int rc;
2902
2903         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2904         if (rc)
2905                 return rc;
2906
2907         req->PersistentFileId = persistent_fid;
2908         req->VolatileFileId = volatile_fid;
2909         iov[0].iov_base = (char *)req;
2910         iov[0].iov_len = total_len;
2911
2912         return 0;
2913 }
2914
2915 void
2916 SMB2_close_free(struct smb_rqst *rqst)
2917 {
2918         if (rqst && rqst->rq_iov)
2919                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2920 }
2921
2922 int
2923 SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2924                  u64 persistent_fid, u64 volatile_fid, int flags)
2925 {
2926         struct smb_rqst rqst;
2927         struct smb2_close_rsp *rsp = NULL;
2928         struct cifs_ses *ses = tcon->ses;
2929         struct kvec iov[1];
2930         struct kvec rsp_iov;
2931         int resp_buftype = CIFS_NO_BUFFER;
2932         int rc = 0;
2933
2934         cifs_dbg(FYI, "Close\n");
2935
2936         if (!ses || !(ses->server))
2937                 return -EIO;
2938
2939         if (smb3_encryption_required(tcon))
2940                 flags |= CIFS_TRANSFORM_REQ;
2941
2942         memset(&rqst, 0, sizeof(struct smb_rqst));
2943         memset(&iov, 0, sizeof(iov));
2944         rqst.rq_iov = iov;
2945         rqst.rq_nvec = 1;
2946
2947         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
2948         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
2949         if (rc)
2950                 goto close_exit;
2951
2952         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2953         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2954
2955         if (rc != 0) {
2956                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2957                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2958                                      rc);
2959                 goto close_exit;
2960         } else
2961                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
2962                                       ses->Suid);
2963
2964         atomic_dec(&tcon->num_remote_opens);
2965
2966         /* BB FIXME - decode close response, update inode for caching */
2967
2968 close_exit:
2969         SMB2_close_free(&rqst);
2970         free_rsp_buf(resp_buftype, rsp);
2971         return rc;
2972 }
2973
2974 int
2975 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2976            u64 persistent_fid, u64 volatile_fid)
2977 {
2978         return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2979 }
2980
2981 int
2982 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
2983                   struct kvec *iov, unsigned int min_buf_size)
2984 {
2985         unsigned int smb_len = iov->iov_len;
2986         char *end_of_smb = smb_len + (char *)iov->iov_base;
2987         char *begin_of_buf = offset + (char *)iov->iov_base;
2988         char *end_of_buf = begin_of_buf + buffer_length;
2989
2990
2991         if (buffer_length < min_buf_size) {
2992                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2993                          buffer_length, min_buf_size);
2994                 return -EINVAL;
2995         }
2996
2997         /* check if beyond RFC1001 maximum length */
2998         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2999                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3000                          buffer_length, smb_len);
3001                 return -EINVAL;
3002         }
3003
3004         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3005                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
3006                 return -EINVAL;
3007         }
3008
3009         return 0;
3010 }
3011
3012 /*
3013  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3014  * Caller must free buffer.
3015  */
3016 int
3017 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3018                            struct kvec *iov, unsigned int minbufsize,
3019                            char *data)
3020 {
3021         char *begin_of_buf = offset + (char *)iov->iov_base;
3022         int rc;
3023
3024         if (!data)
3025                 return -EINVAL;
3026
3027         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3028         if (rc)
3029                 return rc;
3030
3031         memcpy(data, begin_of_buf, buffer_length);
3032
3033         return 0;
3034 }
3035
3036 int
3037 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
3038                      u64 persistent_fid, u64 volatile_fid,
3039                      u8 info_class, u8 info_type, u32 additional_info,
3040                      size_t output_len, size_t input_len, void *input)
3041 {
3042         struct smb2_query_info_req *req;
3043         struct kvec *iov = rqst->rq_iov;
3044         unsigned int total_len;
3045         int rc;
3046
3047         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
3048                              &total_len);
3049         if (rc)
3050                 return rc;
3051
3052         req->InfoType = info_type;
3053         req->FileInfoClass = info_class;
3054         req->PersistentFileId = persistent_fid;
3055         req->VolatileFileId = volatile_fid;
3056         req->AdditionalInformation = cpu_to_le32(additional_info);
3057
3058         req->OutputBufferLength = cpu_to_le32(output_len);
3059         if (input_len) {
3060                 req->InputBufferLength = cpu_to_le32(input_len);
3061                 /* total_len for smb query request never close to le16 max */
3062                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3063                 memcpy(req->Buffer, input, input_len);
3064         }
3065
3066         iov[0].iov_base = (char *)req;
3067         /* 1 for Buffer */
3068         iov[0].iov_len = total_len - 1 + input_len;
3069         return 0;
3070 }
3071
3072 void
3073 SMB2_query_info_free(struct smb_rqst *rqst)
3074 {
3075         if (rqst && rqst->rq_iov)
3076                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3077 }
3078
3079 static int
3080 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3081            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3082            u32 additional_info, size_t output_len, size_t min_len, void **data,
3083                 u32 *dlen)
3084 {
3085         struct smb_rqst rqst;
3086         struct smb2_query_info_rsp *rsp = NULL;
3087         struct kvec iov[1];
3088         struct kvec rsp_iov;
3089         int rc = 0;
3090         int resp_buftype = CIFS_NO_BUFFER;
3091         struct cifs_ses *ses = tcon->ses;
3092         struct TCP_Server_Info *server;
3093         int flags = 0;
3094         bool allocated = false;
3095
3096         cifs_dbg(FYI, "Query Info\n");
3097
3098         if (!ses)
3099                 return -EIO;
3100         server = ses->server;
3101         if (!server)
3102                 return -EIO;
3103
3104         if (smb3_encryption_required(tcon))
3105                 flags |= CIFS_TRANSFORM_REQ;
3106
3107         memset(&rqst, 0, sizeof(struct smb_rqst));
3108         memset(&iov, 0, sizeof(iov));
3109         rqst.rq_iov = iov;
3110         rqst.rq_nvec = 1;
3111
3112         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
3113                                   info_class, info_type, additional_info,
3114                                   output_len, 0, NULL);
3115         if (rc)
3116                 goto qinf_exit;
3117
3118         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3119                                     ses->Suid, info_class, (__u32)info_type);
3120
3121         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3122         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3123
3124         if (rc) {
3125                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3126                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3127                                 ses->Suid, info_class, (__u32)info_type, rc);
3128                 goto qinf_exit;
3129         }
3130
3131         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3132                                 ses->Suid, info_class, (__u32)info_type);
3133
3134         if (dlen) {
3135                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3136                 if (!*data) {
3137                         *data = kmalloc(*dlen, GFP_KERNEL);
3138                         if (!*data) {
3139                                 cifs_tcon_dbg(VFS,
3140                                         "Error %d allocating memory for acl\n",
3141                                         rc);
3142                                 *dlen = 0;
3143                                 rc = -ENOMEM;
3144                                 goto qinf_exit;
3145                         }
3146                         allocated = true;
3147                 }
3148         }
3149
3150         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3151                                         le32_to_cpu(rsp->OutputBufferLength),
3152                                         &rsp_iov, min_len, *data);
3153         if (rc && allocated) {
3154                 kfree(*data);
3155                 *data = NULL;
3156                 *dlen = 0;
3157         }
3158
3159 qinf_exit:
3160         SMB2_query_info_free(&rqst);
3161         free_rsp_buf(resp_buftype, rsp);
3162         return rc;
3163 }
3164
3165 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3166         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3167 {
3168         return query_info(xid, tcon, persistent_fid, volatile_fid,
3169                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3170                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3171                           sizeof(struct smb2_file_all_info), (void **)&data,
3172                           NULL);
3173 }
3174
3175 int
3176 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3177                 u64 persistent_fid, u64 volatile_fid,
3178                 void **data, u32 *plen)
3179 {
3180         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
3181         *plen = 0;
3182
3183         return query_info(xid, tcon, persistent_fid, volatile_fid,
3184                           0, SMB2_O_INFO_SECURITY, additional_info,
3185                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3186 }
3187
3188 int
3189 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3190                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3191 {
3192         return query_info(xid, tcon, persistent_fid, volatile_fid,
3193                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3194                           sizeof(struct smb2_file_internal_info),
3195                           sizeof(struct smb2_file_internal_info),
3196                           (void **)&uniqueid, NULL);
3197 }
3198
3199 /*
3200  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3201  * See MS-SMB2 2.2.35 and 2.2.36
3202  */
3203
3204 static int
3205 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3206                 struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid,
3207                 u32 completion_filter, bool watch_tree)
3208 {
3209         struct smb2_change_notify_req *req;
3210         struct kvec *iov = rqst->rq_iov;
3211         unsigned int total_len;
3212         int rc;
3213
3214         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, (void **) &req, &total_len);
3215         if (rc)
3216                 return rc;
3217
3218         req->PersistentFileId = persistent_fid;
3219         req->VolatileFileId = volatile_fid;
3220         req->OutputBufferLength = SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE;
3221         req->CompletionFilter = cpu_to_le32(completion_filter);
3222         if (watch_tree)
3223                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3224         else
3225                 req->Flags = 0;
3226
3227         iov[0].iov_base = (char *)req;
3228         iov[0].iov_len = total_len;
3229
3230         return 0;
3231 }
3232
3233 int
3234 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3235                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3236                 u32 completion_filter)
3237 {
3238         struct cifs_ses *ses = tcon->ses;
3239         struct smb_rqst rqst;
3240         struct kvec iov[1];
3241         struct kvec rsp_iov = {NULL, 0};
3242         int resp_buftype = CIFS_NO_BUFFER;
3243         int flags = 0;
3244         int rc = 0;
3245
3246         cifs_dbg(FYI, "change notify\n");
3247         if (!ses || !(ses->server))
3248                 return -EIO;
3249
3250         if (smb3_encryption_required(tcon))
3251                 flags |= CIFS_TRANSFORM_REQ;
3252
3253         memset(&rqst, 0, sizeof(struct smb_rqst));
3254         memset(&iov, 0, sizeof(iov));
3255         rqst.rq_iov = iov;
3256         rqst.rq_nvec = 1;
3257
3258         rc = SMB2_notify_init(xid, &rqst, tcon, persistent_fid, volatile_fid,
3259                               completion_filter, watch_tree);
3260         if (rc)
3261                 goto cnotify_exit;
3262
3263         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3264                                 (u8)watch_tree, completion_filter);
3265         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3266
3267         if (rc != 0) {
3268                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3269                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3270                                 (u8)watch_tree, completion_filter, rc);
3271         } else
3272                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3273                                 ses->Suid, (u8)watch_tree, completion_filter);
3274
3275  cnotify_exit:
3276         if (rqst.rq_iov)
3277                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3278         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3279         return rc;
3280 }
3281
3282
3283
3284 /*
3285  * This is a no-op for now. We're not really interested in the reply, but
3286  * rather in the fact that the server sent one and that server->lstrp
3287  * gets updated.
3288  *
3289  * FIXME: maybe we should consider checking that the reply matches request?
3290  */
3291 static void
3292 smb2_echo_callback(struct mid_q_entry *mid)
3293 {
3294         struct TCP_Server_Info *server = mid->callback_data;
3295         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3296         struct cifs_credits credits = { .value = 0, .instance = 0 };
3297
3298         if (mid->mid_state == MID_RESPONSE_RECEIVED
3299             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3300                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3301                 credits.instance = server->reconnect_instance;
3302         }
3303
3304         DeleteMidQEntry(mid);
3305         add_credits(server, &credits, CIFS_ECHO_OP);
3306 }
3307
3308 void smb2_reconnect_server(struct work_struct *work)
3309 {
3310         struct TCP_Server_Info *server = container_of(work,
3311                                         struct TCP_Server_Info, reconnect.work);
3312         struct cifs_ses *ses;
3313         struct cifs_tcon *tcon, *tcon2;
3314         struct list_head tmp_list;
3315         int tcon_exist = false;
3316         int rc;
3317         int resched = false;
3318
3319
3320         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3321         mutex_lock(&server->reconnect_mutex);
3322
3323         INIT_LIST_HEAD(&tmp_list);
3324         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3325
3326         spin_lock(&cifs_tcp_ses_lock);
3327         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3328                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3329                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3330                                 tcon->tc_count++;
3331                                 list_add_tail(&tcon->rlist, &tmp_list);
3332                                 tcon_exist = true;
3333                         }
3334                 }
3335                 /*
3336                  * IPC has the same lifetime as its session and uses its
3337                  * refcount.
3338                  */
3339                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3340                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3341                         tcon_exist = true;
3342                         ses->ses_count++;
3343                 }
3344         }
3345         /*
3346          * Get the reference to server struct to be sure that the last call of
3347          * cifs_put_tcon() in the loop below won't release the server pointer.
3348          */
3349         if (tcon_exist)
3350                 server->srv_count++;
3351
3352         spin_unlock(&cifs_tcp_ses_lock);
3353
3354         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3355                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
3356                 if (!rc)
3357                         cifs_reopen_persistent_handles(tcon);
3358                 else
3359                         resched = true;
3360                 list_del_init(&tcon->rlist);
3361                 if (tcon->ipc)
3362                         cifs_put_smb_ses(tcon->ses);
3363                 else
3364                         cifs_put_tcon(tcon);
3365         }
3366
3367         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3368         if (resched)
3369                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3370         mutex_unlock(&server->reconnect_mutex);
3371
3372         /* now we can safely release srv struct */
3373         if (tcon_exist)
3374                 cifs_put_tcp_session(server, 1);
3375 }
3376
3377 int
3378 SMB2_echo(struct TCP_Server_Info *server)
3379 {
3380         struct smb2_echo_req *req;
3381         int rc = 0;
3382         struct kvec iov[1];
3383         struct smb_rqst rqst = { .rq_iov = iov,
3384                                  .rq_nvec = 1 };
3385         unsigned int total_len;
3386
3387         cifs_dbg(FYI, "In echo request\n");
3388
3389         if (server->tcpStatus == CifsNeedNegotiate) {
3390                 /* No need to send echo on newly established connections */
3391                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
3392                 return rc;
3393         }
3394
3395         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
3396         if (rc)
3397                 return rc;
3398
3399         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3400
3401         iov[0].iov_len = total_len;
3402         iov[0].iov_base = (char *)req;
3403
3404         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3405                              server, CIFS_ECHO_OP, NULL);
3406         if (rc)
3407                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3408
3409         cifs_small_buf_release(req);
3410         return rc;
3411 }
3412
3413 void
3414 SMB2_flush_free(struct smb_rqst *rqst)
3415 {
3416         if (rqst && rqst->rq_iov)
3417                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3418 }
3419
3420 int
3421 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3422                 struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid)
3423 {
3424         struct smb2_flush_req *req;
3425         struct kvec *iov = rqst->rq_iov;
3426         unsigned int total_len;
3427         int rc;
3428
3429         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
3430         if (rc)
3431                 return rc;
3432
3433         req->PersistentFileId = persistent_fid;
3434         req->VolatileFileId = volatile_fid;
3435
3436         iov[0].iov_base = (char *)req;
3437         iov[0].iov_len = total_len;
3438
3439         return 0;
3440 }
3441
3442 int
3443 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3444            u64 volatile_fid)
3445 {
3446         struct cifs_ses *ses = tcon->ses;
3447         struct smb_rqst rqst;
3448         struct kvec iov[1];
3449         struct kvec rsp_iov = {NULL, 0};
3450         int resp_buftype = CIFS_NO_BUFFER;
3451         int flags = 0;
3452         int rc = 0;
3453
3454         cifs_dbg(FYI, "flush\n");
3455         if (!ses || !(ses->server))
3456                 return -EIO;
3457
3458         if (smb3_encryption_required(tcon))
3459                 flags |= CIFS_TRANSFORM_REQ;
3460
3461         memset(&rqst, 0, sizeof(struct smb_rqst));
3462         memset(&iov, 0, sizeof(iov));
3463         rqst.rq_iov = iov;
3464         rqst.rq_nvec = 1;
3465
3466         rc = SMB2_flush_init(xid, &rqst, tcon, persistent_fid, volatile_fid);
3467         if (rc)
3468                 goto flush_exit;
3469
3470         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3471         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3472
3473         if (rc != 0) {
3474                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3475                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3476                                      rc);
3477         } else
3478                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
3479                                       ses->Suid);
3480
3481  flush_exit:
3482         SMB2_flush_free(&rqst);
3483         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3484         return rc;
3485 }
3486
3487 /*
3488  * To form a chain of read requests, any read requests after the first should
3489  * have the end_of_chain boolean set to true.
3490  */
3491 static int
3492 smb2_new_read_req(void **buf, unsigned int *total_len,
3493         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3494         unsigned int remaining_bytes, int request_type)
3495 {
3496         int rc = -EACCES;
3497         struct smb2_read_plain_req *req = NULL;
3498         struct smb2_sync_hdr *shdr;
3499         struct TCP_Server_Info *server;
3500
3501         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
3502                                  total_len);
3503         if (rc)
3504                 return rc;
3505
3506         server = io_parms->tcon->ses->server;
3507         if (server == NULL)
3508                 return -ECONNABORTED;
3509
3510         shdr = &req->sync_hdr;
3511         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3512
3513         req->PersistentFileId = io_parms->persistent_fid;
3514         req->VolatileFileId = io_parms->volatile_fid;
3515         req->ReadChannelInfoOffset = 0; /* reserved */
3516         req->ReadChannelInfoLength = 0; /* reserved */
3517         req->Channel = 0; /* reserved */
3518         req->MinimumCount = 0;
3519         req->Length = cpu_to_le32(io_parms->length);
3520         req->Offset = cpu_to_le64(io_parms->offset);
3521
3522         trace_smb3_read_enter(0 /* xid */,
3523                         io_parms->persistent_fid,
3524                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3525                         io_parms->offset, io_parms->length);
3526 #ifdef CONFIG_CIFS_SMB_DIRECT
3527         /*
3528          * If we want to do a RDMA write, fill in and append
3529          * smbd_buffer_descriptor_v1 to the end of read request
3530          */
3531         if (server->rdma && rdata && !server->sign &&
3532                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3533
3534                 struct smbd_buffer_descriptor_v1 *v1;
3535                 bool need_invalidate =
3536                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3537
3538                 rdata->mr = smbd_register_mr(
3539                                 server->smbd_conn, rdata->pages,
3540                                 rdata->nr_pages, rdata->page_offset,
3541                                 rdata->tailsz, true, need_invalidate);
3542                 if (!rdata->mr)
3543                         return -EAGAIN;
3544
3545                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3546                 if (need_invalidate)
3547                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3548                 req->ReadChannelInfoOffset =
3549                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3550                 req->ReadChannelInfoLength =
3551                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3552                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3553                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3554                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3555                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3556
3557                 *total_len += sizeof(*v1) - 1;
3558         }
3559 #endif
3560         if (request_type & CHAINED_REQUEST) {
3561                 if (!(request_type & END_OF_CHAIN)) {
3562                         /* next 8-byte aligned request */
3563                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3564                         shdr->NextCommand = cpu_to_le32(*total_len);
3565                 } else /* END_OF_CHAIN */
3566                         shdr->NextCommand = 0;
3567                 if (request_type & RELATED_REQUEST) {
3568                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3569                         /*
3570                          * Related requests use info from previous read request
3571                          * in chain.
3572                          */
3573                         shdr->SessionId = 0xFFFFFFFF;
3574                         shdr->TreeId = 0xFFFFFFFF;
3575                         req->PersistentFileId = 0xFFFFFFFF;
3576                         req->VolatileFileId = 0xFFFFFFFF;
3577                 }
3578         }
3579         if (remaining_bytes > io_parms->length)
3580                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3581         else
3582                 req->RemainingBytes = 0;
3583
3584         *buf = req;
3585         return rc;
3586 }
3587
3588 static void
3589 smb2_readv_callback(struct mid_q_entry *mid)
3590 {
3591         struct cifs_readdata *rdata = mid->callback_data;
3592         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3593         struct TCP_Server_Info *server = tcon->ses->server;
3594         struct smb2_sync_hdr *shdr =
3595                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3596         struct cifs_credits credits = { .value = 0, .instance = 0 };
3597         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
3598                                  .rq_nvec = 1,
3599                                  .rq_pages = rdata->pages,
3600                                  .rq_offset = rdata->page_offset,
3601                                  .rq_npages = rdata->nr_pages,
3602                                  .rq_pagesz = rdata->pagesz,
3603                                  .rq_tailsz = rdata->tailsz };
3604
3605         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3606                  __func__, mid->mid, mid->mid_state, rdata->result,
3607                  rdata->bytes);
3608
3609         switch (mid->mid_state) {
3610         case MID_RESPONSE_RECEIVED:
3611                 credits.value = le16_to_cpu(shdr->CreditRequest);
3612                 credits.instance = server->reconnect_instance;
3613                 /* result already set, check signature */
3614                 if (server->sign && !mid->decrypted) {
3615                         int rc;
3616
3617                         rc = smb2_verify_signature(&rqst, server);
3618                         if (rc)
3619                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
3620                                          rc);
3621                 }
3622                 /* FIXME: should this be counted toward the initiating task? */
3623                 task_io_account_read(rdata->got_bytes);
3624                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3625                 break;
3626         case MID_REQUEST_SUBMITTED:
3627         case MID_RETRY_NEEDED:
3628                 rdata->result = -EAGAIN;
3629                 if (server->sign && rdata->got_bytes)
3630                         /* reset bytes number since we can not check a sign */
3631                         rdata->got_bytes = 0;
3632                 /* FIXME: should this be counted toward the initiating task? */
3633                 task_io_account_read(rdata->got_bytes);
3634                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3635                 break;
3636         case MID_RESPONSE_MALFORMED:
3637                 credits.value = le16_to_cpu(shdr->CreditRequest);
3638                 credits.instance = server->reconnect_instance;
3639                 /* fall through */
3640         default:
3641                 rdata->result = -EIO;
3642         }
3643 #ifdef CONFIG_CIFS_SMB_DIRECT
3644         /*
3645          * If this rdata has a memmory registered, the MR can be freed
3646          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3647          * because they have limited number and are used for future I/Os
3648          */
3649         if (rdata->mr) {
3650                 smbd_deregister_mr(rdata->mr);
3651                 rdata->mr = NULL;
3652         }
3653 #endif
3654         if (rdata->result && rdata->result != -ENODATA) {
3655                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3656                 trace_smb3_read_err(0 /* xid */,
3657                                     rdata->cfile->fid.persistent_fid,
3658                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3659                                     rdata->bytes, rdata->result);
3660         } else
3661                 trace_smb3_read_done(0 /* xid */,
3662                                      rdata->cfile->fid.persistent_fid,
3663                                      tcon->tid, tcon->ses->Suid,
3664                                      rdata->offset, rdata->got_bytes);
3665
3666         queue_work(cifsiod_wq, &rdata->work);
3667         DeleteMidQEntry(mid);
3668         add_credits(server, &credits, 0);
3669 }
3670
3671 /* smb2_async_readv - send an async read, and set up mid to handle result */
3672 int
3673 smb2_async_readv(struct cifs_readdata *rdata)
3674 {
3675         int rc, flags = 0;
3676         char *buf;
3677         struct smb2_sync_hdr *shdr;
3678         struct cifs_io_parms io_parms;
3679         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3680                                  .rq_nvec = 1 };
3681         struct TCP_Server_Info *server;
3682         unsigned int total_len;
3683
3684         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3685                  __func__, rdata->offset, rdata->bytes);
3686
3687         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3688         io_parms.offset = rdata->offset;
3689         io_parms.length = rdata->bytes;
3690         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3691         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3692         io_parms.pid = rdata->pid;
3693
3694         server = io_parms.tcon->ses->server;
3695
3696         rc = smb2_new_read_req(
3697                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3698         if (rc)
3699                 return rc;
3700
3701         if (smb3_encryption_required(io_parms.tcon))
3702                 flags |= CIFS_TRANSFORM_REQ;
3703
3704         rdata->iov[0].iov_base = buf;
3705         rdata->iov[0].iov_len = total_len;
3706
3707         shdr = (struct smb2_sync_hdr *)buf;
3708
3709         if (rdata->credits.value > 0) {
3710                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3711                                                 SMB2_MAX_BUFFER_SIZE));
3712                 shdr->CreditRequest =
3713                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3714
3715                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
3716                 if (rc)
3717                         goto async_readv_out;
3718
3719                 flags |= CIFS_HAS_CREDITS;
3720         }
3721
3722         kref_get(&rdata->refcount);
3723         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3724                              cifs_readv_receive, smb2_readv_callback,
3725                              smb3_handle_read_data, rdata, flags,
3726                              &rdata->credits);
3727         if (rc) {
3728                 kref_put(&rdata->refcount, cifs_readdata_release);
3729                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3730                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
3731                                     io_parms.tcon->tid,
3732                                     io_parms.tcon->ses->Suid,
3733                                     io_parms.offset, io_parms.length, rc);
3734         }
3735
3736 async_readv_out:
3737         cifs_small_buf_release(buf);
3738         return rc;
3739 }
3740
3741 int
3742 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3743           unsigned int *nbytes, char **buf, int *buf_type)
3744 {
3745         struct smb_rqst rqst;
3746         int resp_buftype, rc;
3747         struct smb2_read_plain_req *req = NULL;
3748         struct smb2_read_rsp *rsp = NULL;
3749         struct kvec iov[1];
3750         struct kvec rsp_iov;
3751         unsigned int total_len;
3752         int flags = CIFS_LOG_ERROR;
3753         struct cifs_ses *ses = io_parms->tcon->ses;
3754
3755         *nbytes = 0;
3756         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3757         if (rc)
3758                 return rc;
3759
3760         if (smb3_encryption_required(io_parms->tcon))
3761                 flags |= CIFS_TRANSFORM_REQ;
3762
3763         iov[0].iov_base = (char *)req;
3764         iov[0].iov_len = total_len;
3765
3766         memset(&rqst, 0, sizeof(struct smb_rqst));
3767         rqst.rq_iov = iov;
3768         rqst.rq_nvec = 1;
3769
3770         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3771         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3772
3773         if (rc) {
3774                 if (rc != -ENODATA) {
3775                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3776                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3777                         trace_smb3_read_err(xid, req->PersistentFileId,
3778                                             io_parms->tcon->tid, ses->Suid,
3779                                             io_parms->offset, io_parms->length,
3780                                             rc);
3781                 } else
3782                         trace_smb3_read_done(xid, req->PersistentFileId,
3783                                     io_parms->tcon->tid, ses->Suid,
3784                                     io_parms->offset, 0);
3785                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3786                 cifs_small_buf_release(req);
3787                 return rc == -ENODATA ? 0 : rc;
3788         } else
3789                 trace_smb3_read_done(xid, req->PersistentFileId,
3790                                     io_parms->tcon->tid, ses->Suid,
3791                                     io_parms->offset, io_parms->length);
3792
3793         cifs_small_buf_release(req);
3794
3795         *nbytes = le32_to_cpu(rsp->DataLength);
3796         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3797             (*nbytes > io_parms->length)) {
3798                 cifs_dbg(FYI, "bad length %d for count %d\n",
3799                          *nbytes, io_parms->length);
3800                 rc = -EIO;
3801                 *nbytes = 0;
3802         }
3803
3804         if (*buf) {
3805                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3806                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3807         } else if (resp_buftype != CIFS_NO_BUFFER) {
3808                 *buf = rsp_iov.iov_base;
3809                 if (resp_buftype == CIFS_SMALL_BUFFER)
3810                         *buf_type = CIFS_SMALL_BUFFER;
3811                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3812                         *buf_type = CIFS_LARGE_BUFFER;
3813         }
3814         return rc;
3815 }
3816
3817 /*
3818  * Check the mid_state and signature on received buffer (if any), and queue the
3819  * workqueue completion task.
3820  */
3821 static void
3822 smb2_writev_callback(struct mid_q_entry *mid)
3823 {
3824         struct cifs_writedata *wdata = mid->callback_data;
3825         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3826         struct TCP_Server_Info *server = tcon->ses->server;
3827         unsigned int written;
3828         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3829         struct cifs_credits credits = { .value = 0, .instance = 0 };
3830
3831         switch (mid->mid_state) {
3832         case MID_RESPONSE_RECEIVED:
3833                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3834                 credits.instance = server->reconnect_instance;
3835                 wdata->result = smb2_check_receive(mid, server, 0);
3836                 if (wdata->result != 0)
3837                         break;
3838
3839                 written = le32_to_cpu(rsp->DataLength);
3840                 /*
3841                  * Mask off high 16 bits when bytes written as returned
3842                  * by the server is greater than bytes requested by the
3843                  * client. OS/2 servers are known to set incorrect
3844                  * CountHigh values.
3845                  */
3846                 if (written > wdata->bytes)
3847                         written &= 0xFFFF;
3848
3849                 if (written < wdata->bytes)
3850                         wdata->result = -ENOSPC;
3851                 else
3852                         wdata->bytes = written;
3853                 break;
3854         case MID_REQUEST_SUBMITTED:
3855         case MID_RETRY_NEEDED:
3856                 wdata->result = -EAGAIN;
3857                 break;
3858         case MID_RESPONSE_MALFORMED:
3859                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3860                 credits.instance = server->reconnect_instance;
3861                 /* fall through */
3862         default:
3863                 wdata->result = -EIO;
3864                 break;
3865         }
3866 #ifdef CONFIG_CIFS_SMB_DIRECT
3867         /*
3868          * If this wdata has a memory registered, the MR can be freed
3869          * The number of MRs available is limited, it's important to recover
3870          * used MR as soon as I/O is finished. Hold MR longer in the later
3871          * I/O process can possibly result in I/O deadlock due to lack of MR
3872          * to send request on I/O retry
3873          */
3874         if (wdata->mr) {
3875                 smbd_deregister_mr(wdata->mr);
3876                 wdata->mr = NULL;
3877         }
3878 #endif
3879         if (wdata->result) {
3880                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3881                 trace_smb3_write_err(0 /* no xid */,
3882                                      wdata->cfile->fid.persistent_fid,
3883                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3884                                      wdata->bytes, wdata->result);
3885         } else
3886                 trace_smb3_write_done(0 /* no xid */,
3887                                       wdata->cfile->fid.persistent_fid,
3888                                       tcon->tid, tcon->ses->Suid,
3889                                       wdata->offset, wdata->bytes);
3890
3891         queue_work(cifsiod_wq, &wdata->work);
3892         DeleteMidQEntry(mid);
3893         add_credits(server, &credits, 0);
3894 }
3895
3896 /* smb2_async_writev - send an async write, and set up mid to handle result */
3897 int
3898 smb2_async_writev(struct cifs_writedata *wdata,
3899                   void (*release)(struct kref *kref))
3900 {
3901         int rc = -EACCES, flags = 0;
3902         struct smb2_write_req *req = NULL;
3903         struct smb2_sync_hdr *shdr;
3904         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3905         struct TCP_Server_Info *server = tcon->ses->server;
3906         struct kvec iov[1];
3907         struct smb_rqst rqst = { };
3908         unsigned int total_len;
3909
3910         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3911         if (rc)
3912                 return rc;
3913
3914         if (smb3_encryption_required(tcon))
3915                 flags |= CIFS_TRANSFORM_REQ;
3916
3917         shdr = (struct smb2_sync_hdr *)req;
3918         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3919
3920         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3921         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3922         req->WriteChannelInfoOffset = 0;
3923         req->WriteChannelInfoLength = 0;
3924         req->Channel = 0;
3925         req->Offset = cpu_to_le64(wdata->offset);
3926         req->DataOffset = cpu_to_le16(
3927                                 offsetof(struct smb2_write_req, Buffer));
3928         req->RemainingBytes = 0;
3929
3930         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
3931                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
3932 #ifdef CONFIG_CIFS_SMB_DIRECT
3933         /*
3934          * If we want to do a server RDMA read, fill in and append
3935          * smbd_buffer_descriptor_v1 to the end of write request
3936          */
3937         if (server->rdma && !server->sign && wdata->bytes >=
3938                 server->smbd_conn->rdma_readwrite_threshold) {
3939
3940                 struct smbd_buffer_descriptor_v1 *v1;
3941                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3942
3943                 wdata->mr = smbd_register_mr(
3944                                 server->smbd_conn, wdata->pages,
3945                                 wdata->nr_pages, wdata->page_offset,
3946                                 wdata->tailsz, false, need_invalidate);
3947                 if (!wdata->mr) {
3948                         rc = -EAGAIN;
3949                         goto async_writev_out;
3950                 }
3951                 req->Length = 0;
3952                 req->DataOffset = 0;
3953                 if (wdata->nr_pages > 1)
3954                         req->RemainingBytes =
3955                                 cpu_to_le32(
3956                                         (wdata->nr_pages - 1) * wdata->pagesz -
3957                                         wdata->page_offset + wdata->tailsz
3958                                 );
3959                 else
3960                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3961                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3962                 if (need_invalidate)
3963                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3964                 req->WriteChannelInfoOffset =
3965                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3966                 req->WriteChannelInfoLength =
3967                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3968                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3969                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3970                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3971                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3972         }
3973 #endif
3974         iov[0].iov_len = total_len - 1;
3975         iov[0].iov_base = (char *)req;
3976
3977         rqst.rq_iov = iov;
3978         rqst.rq_nvec = 1;
3979         rqst.rq_pages = wdata->pages;
3980         rqst.rq_offset = wdata->page_offset;
3981         rqst.rq_npages = wdata->nr_pages;
3982         rqst.rq_pagesz = wdata->pagesz;
3983         rqst.rq_tailsz = wdata->tailsz;
3984 #ifdef CONFIG_CIFS_SMB_DIRECT
3985         if (wdata->mr) {
3986                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3987                 rqst.rq_npages = 0;
3988         }
3989 #endif
3990         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3991                  wdata->offset, wdata->bytes);
3992
3993 #ifdef CONFIG_CIFS_SMB_DIRECT
3994         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3995         if (!wdata->mr)
3996                 req->Length = cpu_to_le32(wdata->bytes);
3997 #else
3998         req->Length = cpu_to_le32(wdata->bytes);
3999 #endif
4000
4001         if (wdata->credits.value > 0) {
4002                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4003                                                     SMB2_MAX_BUFFER_SIZE));
4004                 shdr->CreditRequest =
4005                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
4006
4007                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4008                 if (rc)
4009                         goto async_writev_out;
4010
4011                 flags |= CIFS_HAS_CREDITS;
4012         }
4013
4014         kref_get(&wdata->refcount);
4015         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4016                              wdata, flags, &wdata->credits);
4017
4018         if (rc) {
4019                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
4020                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4021                                      wdata->bytes, rc);
4022                 kref_put(&wdata->refcount, release);
4023                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4024         }
4025
4026 async_writev_out:
4027         cifs_small_buf_release(req);
4028         return rc;
4029 }
4030
4031 /*
4032  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4033  * The length field from io_parms must be at least 1 and indicates a number of
4034  * elements with data to write that begins with position 1 in iov array. All
4035  * data length is specified by count.
4036  */
4037 int
4038 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4039            unsigned int *nbytes, struct kvec *iov, int n_vec)
4040 {
4041         struct smb_rqst rqst;
4042         int rc = 0;
4043         struct smb2_write_req *req = NULL;
4044         struct smb2_write_rsp *rsp = NULL;
4045         int resp_buftype;
4046         struct kvec rsp_iov;
4047         int flags = 0;
4048         unsigned int total_len;
4049
4050         *nbytes = 0;
4051
4052         if (n_vec < 1)
4053                 return rc;
4054
4055         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
4056                              &total_len);
4057         if (rc)
4058                 return rc;
4059
4060         if (io_parms->tcon->ses->server == NULL)
4061                 return -ECONNABORTED;
4062
4063         if (smb3_encryption_required(io_parms->tcon))
4064                 flags |= CIFS_TRANSFORM_REQ;
4065
4066         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
4067
4068         req->PersistentFileId = io_parms->persistent_fid;
4069         req->VolatileFileId = io_parms->volatile_fid;
4070         req->WriteChannelInfoOffset = 0;
4071         req->WriteChannelInfoLength = 0;
4072         req->Channel = 0;
4073         req->Length = cpu_to_le32(io_parms->length);
4074         req->Offset = cpu_to_le64(io_parms->offset);
4075         req->DataOffset = cpu_to_le16(
4076                                 offsetof(struct smb2_write_req, Buffer));
4077         req->RemainingBytes = 0;
4078
4079         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4080                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4081                 io_parms->offset, io_parms->length);
4082
4083         iov[0].iov_base = (char *)req;
4084         /* 1 for Buffer */
4085         iov[0].iov_len = total_len - 1;
4086
4087         memset(&rqst, 0, sizeof(struct smb_rqst));
4088         rqst.rq_iov = iov;
4089         rqst.rq_nvec = n_vec + 1;
4090
4091         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
4092                             &resp_buftype, flags, &rsp_iov);
4093         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4094
4095         if (rc) {
4096                 trace_smb3_write_err(xid, req->PersistentFileId,
4097                                      io_parms->tcon->tid,
4098                                      io_parms->tcon->ses->Suid,
4099                                      io_parms->offset, io_parms->length, rc);
4100                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4101                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4102         } else {
4103                 *nbytes = le32_to_cpu(rsp->DataLength);
4104                 trace_smb3_write_done(xid, req->PersistentFileId,
4105                                      io_parms->tcon->tid,
4106                                      io_parms->tcon->ses->Suid,
4107                                      io_parms->offset, *nbytes);
4108         }
4109
4110         cifs_small_buf_release(req);
4111         free_rsp_buf(resp_buftype, rsp);
4112         return rc;
4113 }
4114
4115 static unsigned int
4116 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
4117 {
4118         int len;
4119         unsigned int entrycount = 0;
4120         unsigned int next_offset = 0;
4121         char *entryptr;
4122         FILE_DIRECTORY_INFO *dir_info;
4123
4124         if (bufstart == NULL)
4125                 return 0;
4126
4127         entryptr = bufstart;
4128
4129         while (1) {
4130                 if (entryptr + next_offset < entryptr ||
4131                     entryptr + next_offset > end_of_buf ||
4132                     entryptr + next_offset + size > end_of_buf) {
4133                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4134                         break;
4135                 }
4136
4137                 entryptr = entryptr + next_offset;
4138                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4139
4140                 len = le32_to_cpu(dir_info->FileNameLength);
4141                 if (entryptr + len < entryptr ||
4142                     entryptr + len > end_of_buf ||
4143                     entryptr + len + size > end_of_buf) {
4144                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4145                                  end_of_buf);
4146                         break;
4147                 }
4148
4149                 *lastentry = entryptr;
4150                 entrycount++;
4151
4152                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4153                 if (!next_offset)
4154                         break;
4155         }
4156
4157         return entrycount;
4158 }
4159
4160 /*
4161  * Readdir/FindFirst
4162  */
4163 int
4164 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4165                      u64 persistent_fid, u64 volatile_fid, int index,
4166                      struct cifs_search_info *srch_inf)
4167 {
4168         struct smb_rqst rqst;
4169         struct smb2_query_directory_req *req;
4170         struct smb2_query_directory_rsp *rsp = NULL;
4171         struct kvec iov[2];
4172         struct kvec rsp_iov;
4173         int rc = 0;
4174         int len;
4175         int resp_buftype = CIFS_NO_BUFFER;
4176         unsigned char *bufptr;
4177         struct TCP_Server_Info *server;
4178         struct cifs_ses *ses = tcon->ses;
4179         __le16 asteriks = cpu_to_le16('*');
4180         char *end_of_smb;
4181         unsigned int output_size = CIFSMaxBufSize;
4182         size_t info_buf_size;
4183         int flags = 0;
4184         unsigned int total_len;
4185
4186         if (ses && (ses->server))
4187                 server = ses->server;
4188         else
4189                 return -EIO;
4190
4191         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
4192                              &total_len);
4193         if (rc)
4194                 return rc;
4195
4196         if (smb3_encryption_required(tcon))
4197                 flags |= CIFS_TRANSFORM_REQ;
4198
4199         switch (srch_inf->info_level) {
4200         case SMB_FIND_FILE_DIRECTORY_INFO:
4201                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4202                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4203                 break;
4204         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4205                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4206                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4207                 break;
4208         default:
4209                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4210                          srch_inf->info_level);
4211                 rc = -EINVAL;
4212                 goto qdir_exit;
4213         }
4214
4215         req->FileIndex = cpu_to_le32(index);
4216         req->PersistentFileId = persistent_fid;
4217         req->VolatileFileId = volatile_fid;
4218
4219         len = 0x2;
4220         bufptr = req->Buffer;
4221         memcpy(bufptr, &asteriks, len);
4222
4223         req->FileNameOffset =
4224                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4225         req->FileNameLength = cpu_to_le16(len);
4226         /*
4227          * BB could be 30 bytes or so longer if we used SMB2 specific
4228          * buffer lengths, but this is safe and close enough.
4229          */
4230         output_size = min_t(unsigned int, output_size, server->maxBuf);
4231         output_size = min_t(unsigned int, output_size, 2 << 15);
4232         req->OutputBufferLength = cpu_to_le32(output_size);
4233
4234         iov[0].iov_base = (char *)req;
4235         /* 1 for Buffer */
4236         iov[0].iov_len = total_len - 1;
4237
4238         iov[1].iov_base = (char *)(req->Buffer);
4239         iov[1].iov_len = len;
4240
4241         memset(&rqst, 0, sizeof(struct smb_rqst));
4242         rqst.rq_iov = iov;
4243         rqst.rq_nvec = 2;
4244
4245         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4246                         tcon->ses->Suid, index, output_size);
4247
4248         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4249         cifs_small_buf_release(req);
4250         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4251
4252         if (rc) {
4253                 if (rc == -ENODATA &&
4254                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4255                         trace_smb3_query_dir_done(xid, persistent_fid,
4256                                 tcon->tid, tcon->ses->Suid, index, 0);
4257                         srch_inf->endOfSearch = true;
4258                         rc = 0;
4259                 } else {
4260                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4261                                 tcon->ses->Suid, index, 0, rc);
4262                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4263                 }
4264                 goto qdir_exit;
4265         }
4266
4267         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4268                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4269                                info_buf_size);
4270         if (rc) {
4271                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4272                         tcon->ses->Suid, index, 0, rc);
4273                 goto qdir_exit;
4274         }
4275
4276         srch_inf->unicode = true;
4277
4278         if (srch_inf->ntwrk_buf_start) {
4279                 if (srch_inf->smallBuf)
4280                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4281                 else
4282                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4283         }
4284         srch_inf->ntwrk_buf_start = (char *)rsp;
4285         srch_inf->srch_entries_start = srch_inf->last_entry =
4286                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4287         end_of_smb = rsp_iov.iov_len + (char *)rsp;
4288         srch_inf->entries_in_buffer =
4289                         num_entries(srch_inf->srch_entries_start, end_of_smb,
4290                                     &srch_inf->last_entry, info_buf_size);
4291         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4292         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4293                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4294                  srch_inf->srch_entries_start, srch_inf->last_entry);
4295         if (resp_buftype == CIFS_LARGE_BUFFER)
4296                 srch_inf->smallBuf = false;
4297         else if (resp_buftype == CIFS_SMALL_BUFFER)
4298                 srch_inf->smallBuf = true;
4299         else
4300                 cifs_tcon_dbg(VFS, "illegal search buffer type\n");
4301
4302         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4303                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4304         return rc;
4305
4306 qdir_exit:
4307         free_rsp_buf(resp_buftype, rsp);
4308         return rc;
4309 }
4310
4311 int
4312 SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
4313                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4314                u8 info_type, u32 additional_info,
4315                 void **data, unsigned int *size)
4316 {
4317         struct smb2_set_info_req *req;
4318         struct kvec *iov = rqst->rq_iov;
4319         unsigned int i, total_len;
4320         int rc;
4321
4322         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
4323         if (rc)
4324                 return rc;
4325
4326         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4327         req->InfoType = info_type;
4328         req->FileInfoClass = info_class;
4329         req->PersistentFileId = persistent_fid;
4330         req->VolatileFileId = volatile_fid;
4331         req->AdditionalInformation = cpu_to_le32(additional_info);
4332
4333         req->BufferOffset =
4334                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4335         req->BufferLength = cpu_to_le32(*size);
4336
4337         memcpy(req->Buffer, *data, *size);
4338         total_len += *size;
4339
4340         iov[0].iov_base = (char *)req;
4341         /* 1 for Buffer */
4342         iov[0].iov_len = total_len - 1;
4343
4344         for (i = 1; i < rqst->rq_nvec; i++) {
4345                 le32_add_cpu(&req->BufferLength, size[i]);
4346                 iov[i].iov_base = (char *)data[i];
4347                 iov[i].iov_len = size[i];
4348         }
4349
4350         return 0;
4351 }
4352
4353 void
4354 SMB2_set_info_free(struct smb_rqst *rqst)
4355 {
4356         if (rqst && rqst->rq_iov)
4357                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4358 }
4359
4360 static int
4361 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4362                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4363                u8 info_type, u32 additional_info, unsigned int num,
4364                 void **data, unsigned int *size)
4365 {
4366         struct smb_rqst rqst;
4367         struct smb2_set_info_rsp *rsp = NULL;
4368         struct kvec *iov;
4369         struct kvec rsp_iov;
4370         int rc = 0;
4371         int resp_buftype;
4372         struct cifs_ses *ses = tcon->ses;
4373         int flags = 0;
4374
4375         if (!ses || !(ses->server))
4376                 return -EIO;
4377
4378         if (!num)
4379                 return -EINVAL;
4380
4381         if (smb3_encryption_required(tcon))
4382                 flags |= CIFS_TRANSFORM_REQ;
4383
4384         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4385         if (!iov)
4386                 return -ENOMEM;
4387
4388         memset(&rqst, 0, sizeof(struct smb_rqst));
4389         rqst.rq_iov = iov;
4390         rqst.rq_nvec = num;
4391
4392         rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid,
4393                                 info_class, info_type, additional_info,
4394                                 data, size);
4395         if (rc) {
4396                 kfree(iov);
4397                 return rc;
4398         }
4399
4400
4401         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
4402                             &rsp_iov);
4403         SMB2_set_info_free(&rqst);
4404         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4405
4406         if (rc != 0) {
4407                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4408                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4409                                 ses->Suid, info_class, (__u32)info_type, rc);
4410         }
4411
4412         free_rsp_buf(resp_buftype, rsp);
4413         kfree(iov);
4414         return rc;
4415 }
4416
4417 int
4418 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4419              u64 volatile_fid, u32 pid, __le64 *eof)
4420 {
4421         struct smb2_file_eof_info info;
4422         void *data;
4423         unsigned int size;
4424
4425         info.EndOfFile = *eof;
4426
4427         data = &info;
4428         size = sizeof(struct smb2_file_eof_info);
4429
4430         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4431                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4432                         0, 1, &data, &size);
4433 }
4434
4435 int
4436 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4437                 u64 persistent_fid, u64 volatile_fid,
4438                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4439 {
4440         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4441                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4442                         1, (void **)&pnntsd, &pacllen);
4443 }
4444
4445 int
4446 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4447             u64 persistent_fid, u64 volatile_fid,
4448             struct smb2_file_full_ea_info *buf, int len)
4449 {
4450         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4451                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4452                 0, 1, (void **)&buf, &len);
4453 }
4454
4455 int
4456 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4457                   const u64 persistent_fid, const u64 volatile_fid,
4458                   __u8 oplock_level)
4459 {
4460         struct smb_rqst rqst;
4461         int rc;
4462         struct smb2_oplock_break *req = NULL;
4463         struct cifs_ses *ses = tcon->ses;
4464         int flags = CIFS_OBREAK_OP;
4465         unsigned int total_len;
4466         struct kvec iov[1];
4467         struct kvec rsp_iov;
4468         int resp_buf_type;
4469
4470         cifs_dbg(FYI, "SMB2_oplock_break\n");
4471         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4472                              &total_len);
4473         if (rc)
4474                 return rc;
4475
4476         if (smb3_encryption_required(tcon))
4477                 flags |= CIFS_TRANSFORM_REQ;
4478
4479         req->VolatileFid = volatile_fid;
4480         req->PersistentFid = persistent_fid;
4481         req->OplockLevel = oplock_level;
4482         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4483
4484         flags |= CIFS_NO_RSP_BUF;
4485
4486         iov[0].iov_base = (char *)req;
4487         iov[0].iov_len = total_len;
4488
4489         memset(&rqst, 0, sizeof(struct smb_rqst));
4490         rqst.rq_iov = iov;
4491         rqst.rq_nvec = 1;
4492
4493         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4494         cifs_small_buf_release(req);
4495
4496         if (rc) {
4497                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4498                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
4499         }
4500
4501         return rc;
4502 }
4503
4504 void
4505 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
4506                              struct kstatfs *kst)
4507 {
4508         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
4509                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
4510         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
4511         kst->f_bfree  = kst->f_bavail =
4512                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
4513         return;
4514 }
4515
4516 static void
4517 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
4518                         struct kstatfs *kst)
4519 {
4520         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
4521         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
4522         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
4523         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
4524                 kst->f_bavail = kst->f_bfree;
4525         else
4526                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
4527         if (response_data->TotalFileNodes != cpu_to_le64(-1))
4528                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
4529         if (response_data->FreeFileNodes != cpu_to_le64(-1))
4530                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
4531
4532         return;
4533 }
4534
4535 static int
4536 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
4537                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
4538 {
4539         int rc;
4540         struct smb2_query_info_req *req;
4541         unsigned int total_len;
4542
4543         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
4544
4545         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
4546                 return -EIO;
4547
4548         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
4549                              &total_len);
4550         if (rc)
4551                 return rc;
4552
4553         req->InfoType = SMB2_O_INFO_FILESYSTEM;
4554         req->FileInfoClass = level;
4555         req->PersistentFileId = persistent_fid;
4556         req->VolatileFileId = volatile_fid;
4557         /* 1 for pad */
4558         req->InputBufferOffset =
4559                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4560         req->OutputBufferLength = cpu_to_le32(
4561                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4562
4563         iov->iov_base = (char *)req;
4564         iov->iov_len = total_len;
4565         return 0;
4566 }
4567
4568 int
4569 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4570               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4571 {
4572         struct smb_rqst rqst;
4573         struct smb2_query_info_rsp *rsp = NULL;
4574         struct kvec iov;
4575         struct kvec rsp_iov;
4576         int rc = 0;
4577         int resp_buftype;
4578         struct cifs_ses *ses = tcon->ses;
4579         FILE_SYSTEM_POSIX_INFO *info = NULL;
4580         int flags = 0;
4581
4582         rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4583                                 sizeof(FILE_SYSTEM_POSIX_INFO),
4584                                 persistent_fid, volatile_fid);
4585         if (rc)
4586                 return rc;
4587
4588         if (smb3_encryption_required(tcon))
4589                 flags |= CIFS_TRANSFORM_REQ;
4590
4591         memset(&rqst, 0, sizeof(struct smb_rqst));
4592         rqst.rq_iov = &iov;
4593         rqst.rq_nvec = 1;
4594
4595         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4596         cifs_small_buf_release(iov.iov_base);
4597         if (rc) {
4598                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4599                 goto posix_qfsinf_exit;
4600         }
4601         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4602
4603         info = (FILE_SYSTEM_POSIX_INFO *)(
4604                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4605         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4606                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4607                                sizeof(FILE_SYSTEM_POSIX_INFO));
4608         if (!rc)
4609                 copy_posix_fs_info_to_kstatfs(info, fsdata);
4610
4611 posix_qfsinf_exit:
4612         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4613         return rc;
4614 }
4615
4616 int
4617 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
4618               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4619 {
4620         struct smb_rqst rqst;
4621         struct smb2_query_info_rsp *rsp = NULL;
4622         struct kvec iov;
4623         struct kvec rsp_iov;
4624         int rc = 0;
4625         int resp_buftype;
4626         struct cifs_ses *ses = tcon->ses;
4627         struct smb2_fs_full_size_info *info = NULL;
4628         int flags = 0;
4629
4630         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
4631                                 sizeof(struct smb2_fs_full_size_info),
4632                                 persistent_fid, volatile_fid);
4633         if (rc)
4634                 return rc;
4635
4636         if (smb3_encryption_required(tcon))
4637                 flags |= CIFS_TRANSFORM_REQ;
4638
4639         memset(&rqst, 0, sizeof(struct smb_rqst));
4640         rqst.rq_iov = &iov;
4641         rqst.rq_nvec = 1;
4642
4643         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4644         cifs_small_buf_release(iov.iov_base);
4645         if (rc) {
4646                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4647                 goto qfsinf_exit;
4648         }
4649         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4650
4651         info = (struct smb2_fs_full_size_info *)(
4652                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4653         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4654                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4655                                sizeof(struct smb2_fs_full_size_info));
4656         if (!rc)
4657                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
4658
4659 qfsinf_exit:
4660         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4661         return rc;
4662 }
4663
4664 int
4665 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4666               u64 persistent_fid, u64 volatile_fid, int level)
4667 {
4668         struct smb_rqst rqst;
4669         struct smb2_query_info_rsp *rsp = NULL;
4670         struct kvec iov;
4671         struct kvec rsp_iov;
4672         int rc = 0;
4673         int resp_buftype, max_len, min_len;
4674         struct cifs_ses *ses = tcon->ses;
4675         unsigned int rsp_len, offset;
4676         int flags = 0;
4677
4678         if (level == FS_DEVICE_INFORMATION) {
4679                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4680                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4681         } else if (level == FS_ATTRIBUTE_INFORMATION) {
4682                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4683                 min_len = MIN_FS_ATTR_INFO_SIZE;
4684         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4685                 max_len = sizeof(struct smb3_fs_ss_info);
4686                 min_len = sizeof(struct smb3_fs_ss_info);
4687         } else if (level == FS_VOLUME_INFORMATION) {
4688                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
4689                 min_len = sizeof(struct smb3_fs_vol_info);
4690         } else {
4691                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4692                 return -EINVAL;
4693         }
4694
4695         rc = build_qfs_info_req(&iov, tcon, level, max_len,
4696                                 persistent_fid, volatile_fid);
4697         if (rc)
4698                 return rc;
4699
4700         if (smb3_encryption_required(tcon))
4701                 flags |= CIFS_TRANSFORM_REQ;
4702
4703         memset(&rqst, 0, sizeof(struct smb_rqst));
4704         rqst.rq_iov = &iov;
4705         rqst.rq_nvec = 1;
4706
4707         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4708         cifs_small_buf_release(iov.iov_base);
4709         if (rc) {
4710                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4711                 goto qfsattr_exit;
4712         }
4713         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4714
4715         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4716         offset = le16_to_cpu(rsp->OutputBufferOffset);
4717         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
4718         if (rc)
4719                 goto qfsattr_exit;
4720
4721         if (level == FS_ATTRIBUTE_INFORMATION)
4722                 memcpy(&tcon->fsAttrInfo, offset
4723                         + (char *)rsp, min_t(unsigned int,
4724                         rsp_len, max_len));
4725         else if (level == FS_DEVICE_INFORMATION)
4726                 memcpy(&tcon->fsDevInfo, offset
4727                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4728         else if (level == FS_SECTOR_SIZE_INFORMATION) {
4729                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4730                         (offset + (char *)rsp);
4731                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4732                 tcon->perf_sector_size =
4733                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4734         } else if (level == FS_VOLUME_INFORMATION) {
4735                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
4736                         (offset + (char *)rsp);
4737                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
4738                 tcon->vol_create_time = vol_info->VolumeCreationTime;
4739         }
4740
4741 qfsattr_exit:
4742         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4743         return rc;
4744 }
4745
4746 int
4747 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4748            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4749            const __u32 num_lock, struct smb2_lock_element *buf)
4750 {
4751         struct smb_rqst rqst;
4752         int rc = 0;
4753         struct smb2_lock_req *req = NULL;
4754         struct kvec iov[2];
4755         struct kvec rsp_iov;
4756         int resp_buf_type;
4757         unsigned int count;
4758         int flags = CIFS_NO_RSP_BUF;
4759         unsigned int total_len;
4760
4761         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4762
4763         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4764         if (rc)
4765                 return rc;
4766
4767         if (smb3_encryption_required(tcon))
4768                 flags |= CIFS_TRANSFORM_REQ;
4769
4770         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4771         req->LockCount = cpu_to_le16(num_lock);
4772
4773         req->PersistentFileId = persist_fid;
4774         req->VolatileFileId = volatile_fid;
4775
4776         count = num_lock * sizeof(struct smb2_lock_element);
4777
4778         iov[0].iov_base = (char *)req;
4779         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4780         iov[1].iov_base = (char *)buf;
4781         iov[1].iov_len = count;
4782
4783         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4784
4785         memset(&rqst, 0, sizeof(struct smb_rqst));
4786         rqst.rq_iov = iov;
4787         rqst.rq_nvec = 2;
4788
4789         rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4790                             &rsp_iov);
4791         cifs_small_buf_release(req);
4792         if (rc) {
4793                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4794                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4795                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4796                                     tcon->ses->Suid, rc);
4797         }
4798
4799         return rc;
4800 }
4801
4802 int
4803 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
4804           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4805           const __u64 length, const __u64 offset, const __u32 lock_flags,
4806           const bool wait)
4807 {
4808         struct smb2_lock_element lock;
4809
4810         lock.Offset = cpu_to_le64(offset);
4811         lock.Length = cpu_to_le64(length);
4812         lock.Flags = cpu_to_le32(lock_flags);
4813         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
4814                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
4815
4816         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
4817 }
4818
4819 int
4820 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
4821                  __u8 *lease_key, const __le32 lease_state)
4822 {
4823         struct smb_rqst rqst;
4824         int rc;
4825         struct smb2_lease_ack *req = NULL;
4826         struct cifs_ses *ses = tcon->ses;
4827         int flags = CIFS_OBREAK_OP;
4828         unsigned int total_len;
4829         struct kvec iov[1];
4830         struct kvec rsp_iov;
4831         int resp_buf_type;
4832         __u64 *please_key_high;
4833         __u64 *please_key_low;
4834
4835         cifs_dbg(FYI, "SMB2_lease_break\n");
4836         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4837                              &total_len);
4838         if (rc)
4839                 return rc;
4840
4841         if (smb3_encryption_required(tcon))
4842                 flags |= CIFS_TRANSFORM_REQ;
4843
4844         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4845         req->StructureSize = cpu_to_le16(36);
4846         total_len += 12;
4847
4848         memcpy(req->LeaseKey, lease_key, 16);
4849         req->LeaseState = lease_state;
4850
4851         flags |= CIFS_NO_RSP_BUF;
4852
4853         iov[0].iov_base = (char *)req;
4854         iov[0].iov_len = total_len;
4855
4856         memset(&rqst, 0, sizeof(struct smb_rqst));
4857         rqst.rq_iov = iov;
4858         rqst.rq_nvec = 1;
4859
4860         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4861         cifs_small_buf_release(req);
4862
4863         please_key_low = (__u64 *)lease_key;
4864         please_key_high = (__u64 *)(lease_key+8);
4865         if (rc) {
4866                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4867                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
4868                         ses->Suid, *please_key_low, *please_key_high, rc);
4869                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
4870         } else
4871                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
4872                         ses->Suid, *please_key_low, *please_key_high);
4873
4874         return rc;
4875 }