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