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
 463 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
 464 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
 465 #define SMB2_POSIX_EXTENSIONS_AVAILABLE         cpu_to_le16(0x100)
 466
 467 static void
 468 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 469 {
 470         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 471         pneg_ctxt->DataLength = cpu_to_le16(38);
 472         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 473         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 474         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 475         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 476 }
 477
 478 static void
 479 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 480 {
 481         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 482         pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + le16 cipher */
 483         pneg_ctxt->CipherCount = cpu_to_le16(1);
 484 /* pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;*/ /* not supported yet */
 485         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_CCM;
 486 }
 487
 488 static void
 489 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 490 {
 491         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 492         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 493         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 494         pneg_ctxt->Name[0] = 0x93;
 495         pneg_ctxt->Name[1] = 0xAD;
 496         pneg_ctxt->Name[2] = 0x25;
 497         pneg_ctxt->Name[3] = 0x50;
 498         pneg_ctxt->Name[4] = 0x9C;
 499         pneg_ctxt->Name[5] = 0xB4;
 500         pneg_ctxt->Name[6] = 0x11;
 501         pneg_ctxt->Name[7] = 0xE7;
 502         pneg_ctxt->Name[8] = 0xB4;
 503         pneg_ctxt->Name[9] = 0x23;
 504         pneg_ctxt->Name[10] = 0x83;
 505         pneg_ctxt->Name[11] = 0xDE;
 506         pneg_ctxt->Name[12] = 0x96;
 507         pneg_ctxt->Name[13] = 0x8B;
 508         pneg_ctxt->Name[14] = 0xCD;
 509         pneg_ctxt->Name[15] = 0x7C;
 510 }
 511
 512 static void
 513 assemble_neg_contexts(struct smb2_negotiate_req *req,
 514                       unsigned int *total_len)
 515 {
 516         char *pneg_ctxt = (char *)req;
 517         unsigned int ctxt_len;
 518
 519         if (*total_len > 200) {
 520                 /* In case length corrupted don't want to overrun smb buffer */
 521                 cifs_dbg(VFS, "Bad frame length assembling neg contexts\n");
 522                 return;
 523         }
 524
 525         /*
 526          * round up total_len of fixed part of SMB3 negotiate request to 8
 527          * byte boundary before adding negotiate contexts
 528          */
 529         *total_len = roundup(*total_len, 8);
 530
 531         pneg_ctxt = (*total_len) + (char *)req;
 532         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 533
 534         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 535         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 536         *total_len += ctxt_len;
 537         pneg_ctxt += ctxt_len;
 538
 539         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 540         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 541         *total_len += ctxt_len;
 542         pneg_ctxt += ctxt_len;
 543
 544         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 545         *total_len += sizeof(struct smb2_posix_neg_context);
 546
 547         req->NegotiateContextCount = cpu_to_le16(3);
 548 }
 549
 550 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 551 {
 552         unsigned int len = le16_to_cpu(ctxt->DataLength);
 553
 554         /* If invalid preauth context warn but use what we requested, SHA-512 */
 555         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 556                 printk_once(KERN_WARNING "server sent bad preauth context\n");
 557                 return;
 558         }
 559         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 560                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
 561         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 562                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
 563 }
 564
 565 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 566                               struct smb2_encryption_neg_context *ctxt)
 567 {
 568         unsigned int len = le16_to_cpu(ctxt->DataLength);
 569
 570         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 571         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 572                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
 573                 return -EINVAL;
 574         }
 575
 576         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 577                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
 578                 return -EINVAL;
 579         }
 580         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 581         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 582             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 583                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
 584                 return -EINVAL;
 585         }
 586         server->cipher_type = ctxt->Ciphers[0];
 587         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 588         return 0;
 589 }
 590
 591 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 592                                      struct TCP_Server_Info *server,
 593                                      unsigned int len_of_smb)
 594 {
 595         struct smb2_neg_context *pctx;
 596         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 597         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 598         unsigned int len_of_ctxts, i;
 599         int rc = 0;
 600
 601         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 602         if (len_of_smb <= offset) {
 603                 cifs_dbg(VFS, "Invalid response: negotiate context offset\n");
 604                 return -EINVAL;
 605         }
 606
 607         len_of_ctxts = len_of_smb - offset;
 608
 609         for (i = 0; i < ctxt_cnt; i++) {
 610                 int clen;
 611                 /* check that offset is not beyond end of SMB */
 612                 if (len_of_ctxts == 0)
 613                         break;
 614
 615                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 616                         break;
 617
 618                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 619                 clen = le16_to_cpu(pctx->DataLength);
 620                 if (clen > len_of_ctxts)
 621                         break;
 622
 623                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 624                         decode_preauth_context(
 625                                 (struct smb2_preauth_neg_context *)pctx);
 626                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 627                         rc = decode_encrypt_ctx(server,
 628                                 (struct smb2_encryption_neg_context *)pctx);
 629                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 630                         server->posix_ext_supported = true;
 631                 else
 632                         cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
 633                                 le16_to_cpu(pctx->ContextType));
 634
 635                 if (rc)
 636                         break;
 637                 /* offsets must be 8 byte aligned */
 638                 clen = (clen + 7) & ~0x7;
 639                 offset += clen + sizeof(struct smb2_neg_context);
 640                 len_of_ctxts -= clen;
 641         }
 642         return rc;
 643 }
 644
 645 static struct create_posix *
 646 create_posix_buf(umode_t mode)
 647 {
 648         struct create_posix *buf;
 649
 650         buf = kzalloc(sizeof(struct create_posix),
 651                         GFP_KERNEL);
 652         if (!buf)
 653                 return NULL;
 654
 655         buf->ccontext.DataOffset =
 656                 cpu_to_le16(offsetof(struct create_posix, Mode));
 657         buf->ccontext.DataLength = cpu_to_le32(4);
 658         buf->ccontext.NameOffset =
 659                 cpu_to_le16(offsetof(struct create_posix, Name));
 660         buf->ccontext.NameLength = cpu_to_le16(16);
 661
 662         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 663         buf->Name[0] = 0x93;
 664         buf->Name[1] = 0xAD;
 665         buf->Name[2] = 0x25;
 666         buf->Name[3] = 0x50;
 667         buf->Name[4] = 0x9C;
 668         buf->Name[5] = 0xB4;
 669         buf->Name[6] = 0x11;
 670         buf->Name[7] = 0xE7;
 671         buf->Name[8] = 0xB4;
 672         buf->Name[9] = 0x23;
 673         buf->Name[10] = 0x83;
 674         buf->Name[11] = 0xDE;
 675         buf->Name[12] = 0x96;
 676         buf->Name[13] = 0x8B;
 677         buf->Name[14] = 0xCD;
 678         buf->Name[15] = 0x7C;
 679         buf->Mode = cpu_to_le32(mode);
 680         cifs_dbg(FYI, "mode on posix create 0%o", mode);
 681         return buf;
 682 }
 683
 684 static int
 685 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 686 {
 687         struct smb2_create_req *req = iov[0].iov_base;
 688         unsigned int num = *num_iovec;
 689
 690         iov[num].iov_base = create_posix_buf(mode);
 691         if (iov[num].iov_base == NULL)
 692                 return -ENOMEM;
 693         iov[num].iov_len = sizeof(struct create_posix);
 694         if (!req->CreateContextsOffset)
 695                 req->CreateContextsOffset = cpu_to_le32(
 696                                 sizeof(struct smb2_create_req) +
 697                                 iov[num - 1].iov_len);
 698         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 699         *num_iovec = num + 1;
 700         return 0;
 701 }
 702
 703
 704 /*
 705  *
 706  *      SMB2 Worker functions follow:
 707  *
 708  *      The general structure of the worker functions is:
 709  *      1) Call smb2_init (assembles SMB2 header)
 710  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 711  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 712  *      4) Decode SMB2 command specific fields in the fixed length area
 713  *      5) Decode variable length data area (if any for this SMB2 command type)
 714  *      6) Call free smb buffer
 715  *      7) return
 716  *
 717  */
 718
 719 int
 720 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 721 {
 722         struct smb_rqst rqst;
 723         struct smb2_negotiate_req *req;
 724         struct smb2_negotiate_rsp *rsp;
 725         struct kvec iov[1];
 726         struct kvec rsp_iov;
 727         int rc = 0;
 728         int resp_buftype;
 729         struct TCP_Server_Info *server = ses->server;
 730         int blob_offset, blob_length;
 731         char *security_blob;
 732         int flags = CIFS_NEG_OP;
 733         unsigned int total_len;
 734
 735         cifs_dbg(FYI, "Negotiate protocol\n");
 736
 737         if (!server) {
 738                 WARN(1, "%s: server is NULL!\n", __func__);
 739                 return -EIO;
 740         }
 741
 742         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 743         if (rc)
 744                 return rc;
 745
 746         req->sync_hdr.SessionId = 0;
 747
 748         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 749         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 750
 751         if (strcmp(ses->server->vals->version_string,
 752                    SMB3ANY_VERSION_STRING) == 0) {
 753                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 754                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 755                 req->DialectCount = cpu_to_le16(2);
 756                 total_len += 4;
 757         } else if (strcmp(ses->server->vals->version_string,
 758                    SMBDEFAULT_VERSION_STRING) == 0) {
 759                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 760                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 761                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 762                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 763                 req->DialectCount = cpu_to_le16(4);
 764                 total_len += 8;
 765         } else {
 766                 /* otherwise send specific dialect */
 767                 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 768                 req->DialectCount = cpu_to_le16(1);
 769                 total_len += 2;
 770         }
 771
 772         /* only one of SMB2 signing flags may be set in SMB2 request */
 773         if (ses->sign)
 774                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 775         else if (global_secflags & CIFSSEC_MAY_SIGN)
 776                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 777         else
 778                 req->SecurityMode = 0;
 779
 780         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 781
 782         /* ClientGUID must be zero for SMB2.02 dialect */
 783         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 784                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 785         else {
 786                 memcpy(req->ClientGUID, server->client_guid,
 787                         SMB2_CLIENT_GUID_SIZE);
 788                 if ((ses->server->vals->protocol_id == SMB311_PROT_ID) ||
 789                     (strcmp(ses->server->vals->version_string,
 790                      SMBDEFAULT_VERSION_STRING) == 0))
 791                         assemble_neg_contexts(req, &total_len);
 792         }
 793         iov[0].iov_base = (char *)req;
 794         iov[0].iov_len = total_len;
 795
 796         memset(&rqst, 0, sizeof(struct smb_rqst));
 797         rqst.rq_iov = iov;
 798         rqst.rq_nvec = 1;
 799
 800         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
 801         cifs_small_buf_release(req);
 802         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 803         /*
 804          * No tcon so can't do
 805          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 806          */
 807         if (rc == -EOPNOTSUPP) {
 808                 cifs_dbg(VFS, "Dialect not supported by server. Consider "
 809                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 810                         " older servers\n");
 811                 goto neg_exit;
 812         } else if (rc != 0)
 813                 goto neg_exit;
 814
 815         if (strcmp(ses->server->vals->version_string,
 816                    SMB3ANY_VERSION_STRING) == 0) {
 817                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 818                         cifs_dbg(VFS,
 819                                 "SMB2 dialect returned but not requested\n");
 820                         return -EIO;
 821                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 822                         cifs_dbg(VFS,
 823                                 "SMB2.1 dialect returned but not requested\n");
 824                         return -EIO;
 825                 }
 826         } else if (strcmp(ses->server->vals->version_string,
 827                    SMBDEFAULT_VERSION_STRING) == 0) {
 828                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 829                         cifs_dbg(VFS,
 830                                 "SMB2 dialect returned but not requested\n");
 831                         return -EIO;
 832                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 833                         /* ops set to 3.0 by default for default so update */
 834                         ses->server->ops = &smb21_operations;
 835                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 836                         ses->server->ops = &smb311_operations;
 837         } else if (le16_to_cpu(rsp->DialectRevision) !=
 838                                 ses->server->vals->protocol_id) {
 839                 /* if requested single dialect ensure returned dialect matched */
 840                 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 841                         le16_to_cpu(rsp->DialectRevision));
 842                 return -EIO;
 843         }
 844
 845         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 846
 847         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 848                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 849         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 850                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 851         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 852                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 853         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 854                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 855         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 856                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 857         else {
 858                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 859                          le16_to_cpu(rsp->DialectRevision));
 860                 rc = -EIO;
 861                 goto neg_exit;
 862         }
 863         server->dialect = le16_to_cpu(rsp->DialectRevision);
 864
 865         /*
 866          * Keep a copy of the hash after negprot. This hash will be
 867          * the starting hash value for all sessions made from this
 868          * server.
 869          */
 870         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 871                SMB2_PREAUTH_HASH_SIZE);
 872
 873         /* SMB2 only has an extended negflavor */
 874         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 875         /* set it to the maximum buffer size value we can send with 1 credit */
 876         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 877                                SMB2_MAX_BUFFER_SIZE);
 878         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 879         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 880         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 881         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 882                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 883                                 server->sec_mode);
 884         server->capabilities = le32_to_cpu(rsp->Capabilities);
 885         /* Internal types */
 886         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 887
 888         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 889                                                (struct smb2_sync_hdr *)rsp);
 890         /*
 891          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 892          * for us will be
 893          *      ses->sectype = RawNTLMSSP;
 894          * but for time being this is our only auth choice so doesn't matter.
 895          * We just found a server which sets blob length to zero expecting raw.
 896          */
 897         if (blob_length == 0) {
 898                 cifs_dbg(FYI, "missing security blob on negprot\n");
 899                 server->sec_ntlmssp = true;
 900         }
 901
 902         rc = cifs_enable_signing(server, ses->sign);
 903         if (rc)
 904                 goto neg_exit;
 905         if (blob_length) {
 906                 rc = decode_negTokenInit(security_blob, blob_length, server);
 907                 if (rc == 1)
 908                         rc = 0;
 909                 else if (rc == 0)
 910                         rc = -EIO;
 911         }
 912
 913         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 914                 if (rsp->NegotiateContextCount)
 915                         rc = smb311_decode_neg_context(rsp, server,
 916                                                        rsp_iov.iov_len);
 917                 else
 918                         cifs_dbg(VFS, "Missing expected negotiate contexts\n");
 919         }
 920 neg_exit:
 921         free_rsp_buf(resp_buftype, rsp);
 922         return rc;
 923 }
 924
 925 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 926 {
 927         int rc;
 928         struct validate_negotiate_info_req *pneg_inbuf;
 929         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 930         u32 rsplen;
 931         u32 inbuflen; /* max of 4 dialects */
 932
 933         cifs_dbg(FYI, "validate negotiate\n");
 934
 935         /* In SMB3.11 preauth integrity supersedes validate negotiate */
 936         if (tcon->ses->server->dialect == SMB311_PROT_ID)
 937                 return 0;
 938
 939         /*
 940          * validation ioctl must be signed, so no point sending this if we
 941          * can not sign it (ie are not known user).  Even if signing is not
 942          * required (enabled but not negotiated), in those cases we selectively
 943          * sign just this, the first and only signed request on a connection.
 944          * Having validation of negotiate info  helps reduce attack vectors.
 945          */
 946         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
 947                 return 0; /* validation requires signing */
 948
 949         if (tcon->ses->user_name == NULL) {
 950                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
 951                 return 0; /* validation requires signing */
 952         }
 953
 954         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
 955                 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
 956
 957         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
 958         if (!pneg_inbuf)
 959                 return -ENOMEM;
 960
 961         pneg_inbuf->Capabilities =
 962                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 963         memcpy(pneg_inbuf->Guid, tcon->ses->server->client_guid,
 964                                         SMB2_CLIENT_GUID_SIZE);
 965
 966         if (tcon->ses->sign)
 967                 pneg_inbuf->SecurityMode =
 968                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 969         else if (global_secflags & CIFSSEC_MAY_SIGN)
 970                 pneg_inbuf->SecurityMode =
 971                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 972         else
 973                 pneg_inbuf->SecurityMode = 0;
 974
 975
 976         if (strcmp(tcon->ses->server->vals->version_string,
 977                 SMB3ANY_VERSION_STRING) == 0) {
 978                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 979                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 980                 pneg_inbuf->DialectCount = cpu_to_le16(2);
 981                 /* structure is big enough for 3 dialects, sending only 2 */
 982                 inbuflen = sizeof(*pneg_inbuf) -
 983                                 (2 * sizeof(pneg_inbuf->Dialects[0]));
 984         } else if (strcmp(tcon->ses->server->vals->version_string,
 985                 SMBDEFAULT_VERSION_STRING) == 0) {
 986                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 987                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 988                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 989                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 990                 pneg_inbuf->DialectCount = cpu_to_le16(4);
 991                 /* structure is big enough for 3 dialects */
 992                 inbuflen = sizeof(*pneg_inbuf);
 993         } else {
 994                 /* otherwise specific dialect was requested */
 995                 pneg_inbuf->Dialects[0] =
 996                         cpu_to_le16(tcon->ses->server->vals->protocol_id);
 997                 pneg_inbuf->DialectCount = cpu_to_le16(1);
 998                 /* structure is big enough for 3 dialects, sending only 1 */
 999                 inbuflen = sizeof(*pneg_inbuf) -
1000                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
1001         }
1002
1003         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1004                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1005                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1006                 (char **)&pneg_rsp, &rsplen);
1007         if (rc == -EOPNOTSUPP) {
1008                 /*
1009                  * Old Windows versions or Netapp SMB server can return
1010                  * not supported error. Client should accept it.
1011                  */
1012                 cifs_dbg(VFS, "Server does not support validate negotiate\n");
1013                 return 0;
1014         } else if (rc != 0) {
1015                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
1016                 rc = -EIO;
1017                 goto out_free_inbuf;
1018         }
1019
1020         rc = -EIO;
1021         if (rsplen != sizeof(*pneg_rsp)) {
1022                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
1023                          rsplen);
1024
1025                 /* relax check since Mac returns max bufsize allowed on ioctl */
1026                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1027                         goto out_free_rsp;
1028         }
1029
1030         /* check validate negotiate info response matches what we got earlier */
1031         if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
1032                 goto vneg_out;
1033
1034         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
1035                 goto vneg_out;
1036
1037         /* do not validate server guid because not saved at negprot time yet */
1038
1039         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1040               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
1041                 goto vneg_out;
1042
1043         /* validate negotiate successful */
1044         rc = 0;
1045         cifs_dbg(FYI, "validate negotiate info successful\n");
1046         goto out_free_rsp;
1047
1048 vneg_out:
1049         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1050 out_free_rsp:
1051         kfree(pneg_rsp);
1052 out_free_inbuf:
1053         kfree(pneg_inbuf);
1054         return rc;
1055 }
1056
1057 enum securityEnum
1058 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1059 {
1060         switch (requested) {
1061         case Kerberos:
1062         case RawNTLMSSP:
1063                 return requested;
1064         case NTLMv2:
1065                 return RawNTLMSSP;
1066         case Unspecified:
1067                 if (server->sec_ntlmssp &&
1068                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1069                         return RawNTLMSSP;
1070                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1071                         (global_secflags & CIFSSEC_MAY_KRB5))
1072                         return Kerberos;
1073                 /* Fallthrough */
1074         default:
1075                 return Unspecified;
1076         }
1077 }
1078
1079 struct SMB2_sess_data {
1080         unsigned int xid;
1081         struct cifs_ses *ses;
1082         struct nls_table *nls_cp;
1083         void (*func)(struct SMB2_sess_data *);
1084         int result;
1085         u64 previous_session;
1086
1087         /* we will send the SMB in three pieces:
1088          * a fixed length beginning part, an optional
1089          * SPNEGO blob (which can be zero length), and a
1090          * last part which will include the strings
1091          * and rest of bcc area. This allows us to avoid
1092          * a large buffer 17K allocation
1093          */
1094         int buf0_type;
1095         struct kvec iov[2];
1096 };
1097
1098 static int
1099 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1100 {
1101         int rc;
1102         struct cifs_ses *ses = sess_data->ses;
1103         struct smb2_sess_setup_req *req;
1104         struct TCP_Server_Info *server = ses->server;
1105         unsigned int total_len;
1106
1107         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
1108                              &total_len);
1109         if (rc)
1110                 return rc;
1111
1112         /* First session, not a reauthenticate */
1113         req->sync_hdr.SessionId = 0;
1114
1115         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
1116         req->PreviousSessionId = sess_data->previous_session;
1117
1118         req->Flags = 0; /* MBZ */
1119
1120         /* enough to enable echos and oplocks and one max size write */
1121         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1122
1123         /* only one of SMB2 signing flags may be set in SMB2 request */
1124         if (server->sign)
1125                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1126         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1127                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1128         else
1129                 req->SecurityMode = 0;
1130
1131         req->Capabilities = 0;
1132         req->Channel = 0; /* MBZ */
1133
1134         sess_data->iov[0].iov_base = (char *)req;
1135         /* 1 for pad */
1136         sess_data->iov[0].iov_len = total_len - 1;
1137         /*
1138          * This variable will be used to clear the buffer
1139          * allocated above in case of any error in the calling function.
1140          */
1141         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1142
1143         return 0;
1144 }
1145
1146 static void
1147 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1148 {
1149         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1150         sess_data->buf0_type = CIFS_NO_BUFFER;
1151 }
1152
1153 static int
1154 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1155 {
1156         int rc;
1157         struct smb_rqst rqst;
1158         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1159         struct kvec rsp_iov = { NULL, 0 };
1160
1161         /* Testing shows that buffer offset must be at location of Buffer[0] */
1162         req->SecurityBufferOffset =
1163                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1164         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1165
1166         memset(&rqst, 0, sizeof(struct smb_rqst));
1167         rqst.rq_iov = sess_data->iov;
1168         rqst.rq_nvec = 2;
1169
1170         /* BB add code to build os and lm fields */
1171         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1172                             &rqst,
1173                             &sess_data->buf0_type,
1174                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1175         cifs_small_buf_release(sess_data->iov[0].iov_base);
1176         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1177
1178         return rc;
1179 }
1180
1181 static int
1182 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1183 {
1184         int rc = 0;
1185         struct cifs_ses *ses = sess_data->ses;
1186
1187         mutex_lock(&ses->server->srv_mutex);
1188         if (ses->server->ops->generate_signingkey) {
1189                 rc = ses->server->ops->generate_signingkey(ses);
1190                 if (rc) {
1191                         cifs_dbg(FYI,
1192                                 "SMB3 session key generation failed\n");
1193                         mutex_unlock(&ses->server->srv_mutex);
1194                         return rc;
1195                 }
1196         }
1197         if (!ses->server->session_estab) {
1198                 ses->server->sequence_number = 0x2;
1199                 ses->server->session_estab = true;
1200         }
1201         mutex_unlock(&ses->server->srv_mutex);
1202
1203         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1204         spin_lock(&GlobalMid_Lock);
1205         ses->status = CifsGood;
1206         ses->need_reconnect = false;
1207         spin_unlock(&GlobalMid_Lock);
1208         return rc;
1209 }
1210
1211 #ifdef CONFIG_CIFS_UPCALL
1212 static void
1213 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1214 {
1215         int rc;
1216         struct cifs_ses *ses = sess_data->ses;
1217         struct cifs_spnego_msg *msg;
1218         struct key *spnego_key = NULL;
1219         struct smb2_sess_setup_rsp *rsp = NULL;
1220
1221         rc = SMB2_sess_alloc_buffer(sess_data);
1222         if (rc)
1223                 goto out;
1224
1225         spnego_key = cifs_get_spnego_key(ses);
1226         if (IS_ERR(spnego_key)) {
1227                 rc = PTR_ERR(spnego_key);
1228                 spnego_key = NULL;
1229                 goto out;
1230         }
1231
1232         msg = spnego_key->payload.data[0];
1233         /*
1234          * check version field to make sure that cifs.upcall is
1235          * sending us a response in an expected form
1236          */
1237         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1238                 cifs_dbg(VFS,
1239                           "bad cifs.upcall version. Expected %d got %d",
1240                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1241                 rc = -EKEYREJECTED;
1242                 goto out_put_spnego_key;
1243         }
1244
1245         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1246                                          GFP_KERNEL);
1247         if (!ses->auth_key.response) {
1248                 cifs_dbg(VFS,
1249                         "Kerberos can't allocate (%u bytes) memory",
1250                         msg->sesskey_len);
1251                 rc = -ENOMEM;
1252                 goto out_put_spnego_key;
1253         }
1254         ses->auth_key.len = msg->sesskey_len;
1255
1256         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1257         sess_data->iov[1].iov_len = msg->secblob_len;
1258
1259         rc = SMB2_sess_sendreceive(sess_data);
1260         if (rc)
1261                 goto out_put_spnego_key;
1262
1263         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1264         ses->Suid = rsp->sync_hdr.SessionId;
1265
1266         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1267
1268         rc = SMB2_sess_establish_session(sess_data);
1269 out_put_spnego_key:
1270         key_invalidate(spnego_key);
1271         key_put(spnego_key);
1272 out:
1273         sess_data->result = rc;
1274         sess_data->func = NULL;
1275         SMB2_sess_free_buffer(sess_data);
1276 }
1277 #else
1278 static void
1279 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1280 {
1281         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1282         sess_data->result = -EOPNOTSUPP;
1283         sess_data->func = NULL;
1284 }
1285 #endif
1286
1287 static void
1288 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1289
1290 static void
1291 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1292 {
1293         int rc;
1294         struct cifs_ses *ses = sess_data->ses;
1295         struct smb2_sess_setup_rsp *rsp = NULL;
1296         char *ntlmssp_blob = NULL;
1297         bool use_spnego = false; /* else use raw ntlmssp */
1298         u16 blob_length = 0;
1299
1300         /*
1301          * If memory allocation is successful, caller of this function
1302          * frees it.
1303          */
1304         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1305         if (!ses->ntlmssp) {
1306                 rc = -ENOMEM;
1307                 goto out_err;
1308         }
1309         ses->ntlmssp->sesskey_per_smbsess = true;
1310
1311         rc = SMB2_sess_alloc_buffer(sess_data);
1312         if (rc)
1313                 goto out_err;
1314
1315         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1316                                GFP_KERNEL);
1317         if (ntlmssp_blob == NULL) {
1318                 rc = -ENOMEM;
1319                 goto out;
1320         }
1321
1322         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1323         if (use_spnego) {
1324                 /* BB eventually need to add this */
1325                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1326                 rc = -EOPNOTSUPP;
1327                 goto out;
1328         } else {
1329                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1330                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1331         }
1332         sess_data->iov[1].iov_base = ntlmssp_blob;
1333         sess_data->iov[1].iov_len = blob_length;
1334
1335         rc = SMB2_sess_sendreceive(sess_data);
1336         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1337
1338         /* If true, rc here is expected and not an error */
1339         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1340                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1341                 rc = 0;
1342
1343         if (rc)
1344                 goto out;
1345
1346         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1347                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1348                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1349                         le16_to_cpu(rsp->SecurityBufferOffset));
1350                 rc = -EIO;
1351                 goto out;
1352         }
1353         rc = decode_ntlmssp_challenge(rsp->Buffer,
1354                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1355         if (rc)
1356                 goto out;
1357
1358         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1359
1360
1361         ses->Suid = rsp->sync_hdr.SessionId;
1362         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1363
1364 out:
1365         kfree(ntlmssp_blob);
1366         SMB2_sess_free_buffer(sess_data);
1367         if (!rc) {
1368                 sess_data->result = 0;
1369                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1370                 return;
1371         }
1372 out_err:
1373         kfree(ses->ntlmssp);
1374         ses->ntlmssp = NULL;
1375         sess_data->result = rc;
1376         sess_data->func = NULL;
1377 }
1378
1379 static void
1380 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1381 {
1382         int rc;
1383         struct cifs_ses *ses = sess_data->ses;
1384         struct smb2_sess_setup_req *req;
1385         struct smb2_sess_setup_rsp *rsp = NULL;
1386         unsigned char *ntlmssp_blob = NULL;
1387         bool use_spnego = false; /* else use raw ntlmssp */
1388         u16 blob_length = 0;
1389
1390         rc = SMB2_sess_alloc_buffer(sess_data);
1391         if (rc)
1392                 goto out;
1393
1394         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1395         req->sync_hdr.SessionId = ses->Suid;
1396
1397         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1398                                         sess_data->nls_cp);
1399         if (rc) {
1400                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1401                 goto out;
1402         }
1403
1404         if (use_spnego) {
1405                 /* BB eventually need to add this */
1406                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1407                 rc = -EOPNOTSUPP;
1408                 goto out;
1409         }
1410         sess_data->iov[1].iov_base = ntlmssp_blob;
1411         sess_data->iov[1].iov_len = blob_length;
1412
1413         rc = SMB2_sess_sendreceive(sess_data);
1414         if (rc)
1415                 goto out;
1416
1417         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1418
1419         ses->Suid = rsp->sync_hdr.SessionId;
1420         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1421
1422         rc = SMB2_sess_establish_session(sess_data);
1423 out:
1424         kfree(ntlmssp_blob);
1425         SMB2_sess_free_buffer(sess_data);
1426         kfree(ses->ntlmssp);
1427         ses->ntlmssp = NULL;
1428         sess_data->result = rc;
1429         sess_data->func = NULL;
1430 }
1431
1432 static int
1433 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1434 {
1435         int type;
1436
1437         type = smb2_select_sectype(ses->server, ses->sectype);
1438         cifs_dbg(FYI, "sess setup type %d\n", type);
1439         if (type == Unspecified) {
1440                 cifs_dbg(VFS,
1441                         "Unable to select appropriate authentication method!");
1442                 return -EINVAL;
1443         }
1444
1445         switch (type) {
1446         case Kerberos:
1447                 sess_data->func = SMB2_auth_kerberos;
1448                 break;
1449         case RawNTLMSSP:
1450                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1451                 break;
1452         default:
1453                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1454                 return -EOPNOTSUPP;
1455         }
1456
1457         return 0;
1458 }
1459
1460 int
1461 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1462                 const struct nls_table *nls_cp)
1463 {
1464         int rc = 0;
1465         struct TCP_Server_Info *server = ses->server;
1466         struct SMB2_sess_data *sess_data;
1467
1468         cifs_dbg(FYI, "Session Setup\n");
1469
1470         if (!server) {
1471                 WARN(1, "%s: server is NULL!\n", __func__);
1472                 return -EIO;
1473         }
1474
1475         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1476         if (!sess_data)
1477                 return -ENOMEM;
1478
1479         rc = SMB2_select_sec(ses, sess_data);
1480         if (rc)
1481                 goto out;
1482         sess_data->xid = xid;
1483         sess_data->ses = ses;
1484         sess_data->buf0_type = CIFS_NO_BUFFER;
1485         sess_data->nls_cp = (struct nls_table *) nls_cp;
1486         sess_data->previous_session = ses->Suid;
1487
1488         /*
1489          * Initialize the session hash with the server one.
1490          */
1491         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1492                SMB2_PREAUTH_HASH_SIZE);
1493
1494         while (sess_data->func)
1495                 sess_data->func(sess_data);
1496
1497         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1498                 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1499         rc = sess_data->result;
1500 out:
1501         kfree(sess_data);
1502         return rc;
1503 }
1504
1505 int
1506 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1507 {
1508         struct smb_rqst rqst;
1509         struct smb2_logoff_req *req; /* response is also trivial struct */
1510         int rc = 0;
1511         struct TCP_Server_Info *server;
1512         int flags = 0;
1513         unsigned int total_len;
1514         struct kvec iov[1];
1515         struct kvec rsp_iov;
1516         int resp_buf_type;
1517
1518         cifs_dbg(FYI, "disconnect session %p\n", ses);
1519
1520         if (ses && (ses->server))
1521                 server = ses->server;
1522         else
1523                 return -EIO;
1524
1525         /* no need to send SMB logoff if uid already closed due to reconnect */
1526         if (ses->need_reconnect)
1527                 goto smb2_session_already_dead;
1528
1529         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1530         if (rc)
1531                 return rc;
1532
1533          /* since no tcon, smb2_init can not do this, so do here */
1534         req->sync_hdr.SessionId = ses->Suid;
1535
1536         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1537                 flags |= CIFS_TRANSFORM_REQ;
1538         else if (server->sign)
1539                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1540
1541         flags |= CIFS_NO_RESP;
1542
1543         iov[0].iov_base = (char *)req;
1544         iov[0].iov_len = total_len;
1545
1546         memset(&rqst, 0, sizeof(struct smb_rqst));
1547         rqst.rq_iov = iov;
1548         rqst.rq_nvec = 1;
1549
1550         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1551         cifs_small_buf_release(req);
1552         /*
1553          * No tcon so can't do
1554          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1555          */
1556
1557 smb2_session_already_dead:
1558         return rc;
1559 }
1560
1561 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1562 {
1563         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1564 }
1565
1566 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1567
1568 /* These are similar values to what Windows uses */
1569 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1570 {
1571         tcon->max_chunks = 256;
1572         tcon->max_bytes_chunk = 1048576;
1573         tcon->max_bytes_copy = 16777216;
1574 }
1575
1576 int
1577 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1578           struct cifs_tcon *tcon, const struct nls_table *cp)
1579 {
1580         struct smb_rqst rqst;
1581         struct smb2_tree_connect_req *req;
1582         struct smb2_tree_connect_rsp *rsp = NULL;
1583         struct kvec iov[2];
1584         struct kvec rsp_iov = { NULL, 0 };
1585         int rc = 0;
1586         int resp_buftype;
1587         int unc_path_len;
1588         __le16 *unc_path = NULL;
1589         int flags = 0;
1590         unsigned int total_len;
1591
1592         cifs_dbg(FYI, "TCON\n");
1593
1594         if (!(ses->server) || !tree)
1595                 return -EIO;
1596
1597         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1598         if (unc_path == NULL)
1599                 return -ENOMEM;
1600
1601         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1602         unc_path_len *= 2;
1603         if (unc_path_len < 2) {
1604                 kfree(unc_path);
1605                 return -EINVAL;
1606         }
1607
1608         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1609         tcon->tid = 0;
1610         atomic_set(&tcon->num_remote_opens, 0);
1611         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1612                              &total_len);
1613         if (rc) {
1614                 kfree(unc_path);
1615                 return rc;
1616         }
1617
1618         if (smb3_encryption_required(tcon))
1619                 flags |= CIFS_TRANSFORM_REQ;
1620
1621         iov[0].iov_base = (char *)req;
1622         /* 1 for pad */
1623         iov[0].iov_len = total_len - 1;
1624
1625         /* Testing shows that buffer offset must be at location of Buffer[0] */
1626         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1627                         - 1 /* pad */);
1628         req->PathLength = cpu_to_le16(unc_path_len - 2);
1629         iov[1].iov_base = unc_path;
1630         iov[1].iov_len = unc_path_len;
1631
1632         /*
1633          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1634          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1635          * (Samba servers don't always set the flag so also check if null user)
1636          */
1637         if ((ses->server->dialect == SMB311_PROT_ID) &&
1638             !smb3_encryption_required(tcon) &&
1639             !(ses->session_flags &
1640                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1641             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1642                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1643
1644         memset(&rqst, 0, sizeof(struct smb_rqst));
1645         rqst.rq_iov = iov;
1646         rqst.rq_nvec = 2;
1647
1648         /* Need 64 for max size write so ask for more in case not there yet */
1649         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1650
1651         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1652         cifs_small_buf_release(req);
1653         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1654         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1655         if (rc != 0) {
1656                 if (tcon) {
1657                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1658                         tcon->need_reconnect = true;
1659                 }
1660                 goto tcon_error_exit;
1661         }
1662
1663         switch (rsp->ShareType) {
1664         case SMB2_SHARE_TYPE_DISK:
1665                 cifs_dbg(FYI, "connection to disk share\n");
1666                 break;
1667         case SMB2_SHARE_TYPE_PIPE:
1668                 tcon->pipe = true;
1669                 cifs_dbg(FYI, "connection to pipe share\n");
1670                 break;
1671         case SMB2_SHARE_TYPE_PRINT:
1672                 tcon->print = true;
1673                 cifs_dbg(FYI, "connection to printer\n");
1674                 break;
1675         default:
1676                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1677                 rc = -EOPNOTSUPP;
1678                 goto tcon_error_exit;
1679         }
1680
1681         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1682         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1683         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1684         tcon->tidStatus = CifsGood;
1685         tcon->need_reconnect = false;
1686         tcon->tid = rsp->sync_hdr.TreeId;
1687         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1688
1689         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1690             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1691                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1692
1693         if (tcon->seal &&
1694             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1695                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1696
1697         init_copy_chunk_defaults(tcon);
1698         if (tcon->ses->server->ops->validate_negotiate)
1699                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1700 tcon_exit:
1701
1702         free_rsp_buf(resp_buftype, rsp);
1703         kfree(unc_path);
1704         return rc;
1705
1706 tcon_error_exit:
1707         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1708                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1709         }
1710         goto tcon_exit;
1711 }
1712
1713 int
1714 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1715 {
1716         struct smb_rqst rqst;
1717         struct smb2_tree_disconnect_req *req; /* response is trivial */
1718         int rc = 0;
1719         struct cifs_ses *ses = tcon->ses;
1720         int flags = 0;
1721         unsigned int total_len;
1722         struct kvec iov[1];
1723         struct kvec rsp_iov;
1724         int resp_buf_type;
1725
1726         cifs_dbg(FYI, "Tree Disconnect\n");
1727
1728         if (!ses || !(ses->server))
1729                 return -EIO;
1730
1731         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1732                 return 0;
1733
1734         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1735                              &total_len);
1736         if (rc)
1737                 return rc;
1738
1739         if (smb3_encryption_required(tcon))
1740                 flags |= CIFS_TRANSFORM_REQ;
1741
1742         flags |= CIFS_NO_RESP;
1743
1744         iov[0].iov_base = (char *)req;
1745         iov[0].iov_len = total_len;
1746
1747         memset(&rqst, 0, sizeof(struct smb_rqst));
1748         rqst.rq_iov = iov;
1749         rqst.rq_nvec = 1;
1750
1751         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1752         cifs_small_buf_release(req);
1753         if (rc)
1754                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1755
1756         return rc;
1757 }
1758
1759
1760 static struct create_durable *
1761 create_durable_buf(void)
1762 {
1763         struct create_durable *buf;
1764
1765         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1766         if (!buf)
1767                 return NULL;
1768
1769         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1770                                         (struct create_durable, Data));
1771         buf->ccontext.DataLength = cpu_to_le32(16);
1772         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1773                                 (struct create_durable, Name));
1774         buf->ccontext.NameLength = cpu_to_le16(4);
1775         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1776         buf->Name[0] = 'D';
1777         buf->Name[1] = 'H';
1778         buf->Name[2] = 'n';
1779         buf->Name[3] = 'Q';
1780         return buf;
1781 }
1782
1783 static struct create_durable *
1784 create_reconnect_durable_buf(struct cifs_fid *fid)
1785 {
1786         struct create_durable *buf;
1787
1788         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1789         if (!buf)
1790                 return NULL;
1791
1792         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1793                                         (struct create_durable, Data));
1794         buf->ccontext.DataLength = cpu_to_le32(16);
1795         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1796                                 (struct create_durable, Name));
1797         buf->ccontext.NameLength = cpu_to_le16(4);
1798         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1799         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1800         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1801         buf->Name[0] = 'D';
1802         buf->Name[1] = 'H';
1803         buf->Name[2] = 'n';
1804         buf->Name[3] = 'C';
1805         return buf;
1806 }
1807
1808 __u8
1809 smb2_parse_lease_state(struct TCP_Server_Info *server,
1810                        struct smb2_create_rsp *rsp,
1811                        unsigned int *epoch, char *lease_key)
1812 {
1813         char *data_offset;
1814         struct create_context *cc;
1815         unsigned int next;
1816         unsigned int remaining;
1817         char *name;
1818
1819         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1820         remaining = le32_to_cpu(rsp->CreateContextsLength);
1821         cc = (struct create_context *)data_offset;
1822         while (remaining >= sizeof(struct create_context)) {
1823                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1824                 if (le16_to_cpu(cc->NameLength) == 4 &&
1825                     strncmp(name, "RqLs", 4) == 0)
1826                         return server->ops->parse_lease_buf(cc, epoch,
1827                                                             lease_key);
1828
1829                 next = le32_to_cpu(cc->Next);
1830                 if (!next)
1831                         break;
1832                 remaining -= next;
1833                 cc = (struct create_context *)((char *)cc + next);
1834         }
1835
1836         return 0;
1837 }
1838
1839 static int
1840 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1841                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1842 {
1843         struct smb2_create_req *req = iov[0].iov_base;
1844         unsigned int num = *num_iovec;
1845
1846         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1847         if (iov[num].iov_base == NULL)
1848                 return -ENOMEM;
1849         iov[num].iov_len = server->vals->create_lease_size;
1850         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1851         if (!req->CreateContextsOffset)
1852                 req->CreateContextsOffset = cpu_to_le32(
1853                                 sizeof(struct smb2_create_req) +
1854                                 iov[num - 1].iov_len);
1855         le32_add_cpu(&req->CreateContextsLength,
1856                      server->vals->create_lease_size);
1857         *num_iovec = num + 1;
1858         return 0;
1859 }
1860
1861 static struct create_durable_v2 *
1862 create_durable_v2_buf(struct cifs_open_parms *oparms)
1863 {
1864         struct cifs_fid *pfid = oparms->fid;
1865         struct create_durable_v2 *buf;
1866
1867         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1868         if (!buf)
1869                 return NULL;
1870
1871         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1872                                         (struct create_durable_v2, dcontext));
1873         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1874         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1875                                 (struct create_durable_v2, Name));
1876         buf->ccontext.NameLength = cpu_to_le16(4);
1877
1878         /*
1879          * NB: Handle timeout defaults to 0, which allows server to choose
1880          * (most servers default to 120 seconds) and most clients default to 0.
1881          * This can be overridden at mount ("handletimeout=") if the user wants
1882          * a different persistent (or resilient) handle timeout for all opens
1883          * opens on a particular SMB3 mount.
1884          */
1885         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
1886         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1887         generate_random_uuid(buf->dcontext.CreateGuid);
1888         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1889
1890         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1891         buf->Name[0] = 'D';
1892         buf->Name[1] = 'H';
1893         buf->Name[2] = '2';
1894         buf->Name[3] = 'Q';
1895         return buf;
1896 }
1897
1898 static struct create_durable_handle_reconnect_v2 *
1899 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1900 {
1901         struct create_durable_handle_reconnect_v2 *buf;
1902
1903         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1904                         GFP_KERNEL);
1905         if (!buf)
1906                 return NULL;
1907
1908         buf->ccontext.DataOffset =
1909                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1910                                      dcontext));
1911         buf->ccontext.DataLength =
1912                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1913         buf->ccontext.NameOffset =
1914                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1915                             Name));
1916         buf->ccontext.NameLength = cpu_to_le16(4);
1917
1918         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1919         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1920         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1921         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1922
1923         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1924         buf->Name[0] = 'D';
1925         buf->Name[1] = 'H';
1926         buf->Name[2] = '2';
1927         buf->Name[3] = 'C';
1928         return buf;
1929 }
1930
1931 static int
1932 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1933                     struct cifs_open_parms *oparms)
1934 {
1935         struct smb2_create_req *req = iov[0].iov_base;
1936         unsigned int num = *num_iovec;
1937
1938         iov[num].iov_base = create_durable_v2_buf(oparms);
1939         if (iov[num].iov_base == NULL)
1940                 return -ENOMEM;
1941         iov[num].iov_len = sizeof(struct create_durable_v2);
1942         if (!req->CreateContextsOffset)
1943                 req->CreateContextsOffset =
1944                         cpu_to_le32(sizeof(struct smb2_create_req) +
1945                                                                 iov[1].iov_len);
1946         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1947         *num_iovec = num + 1;
1948         return 0;
1949 }
1950
1951 static int
1952 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1953                     struct cifs_open_parms *oparms)
1954 {
1955         struct smb2_create_req *req = iov[0].iov_base;
1956         unsigned int num = *num_iovec;
1957
1958         /* indicate that we don't need to relock the file */
1959         oparms->reconnect = false;
1960
1961         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1962         if (iov[num].iov_base == NULL)
1963                 return -ENOMEM;
1964         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1965         if (!req->CreateContextsOffset)
1966                 req->CreateContextsOffset =
1967                         cpu_to_le32(sizeof(struct smb2_create_req) +
1968                                                                 iov[1].iov_len);
1969         le32_add_cpu(&req->CreateContextsLength,
1970                         sizeof(struct create_durable_handle_reconnect_v2));
1971         *num_iovec = num + 1;
1972         return 0;
1973 }
1974
1975 static int
1976 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1977                     struct cifs_open_parms *oparms, bool use_persistent)
1978 {
1979         struct smb2_create_req *req = iov[0].iov_base;
1980         unsigned int num = *num_iovec;
1981
1982         if (use_persistent) {
1983                 if (oparms->reconnect)
1984                         return add_durable_reconnect_v2_context(iov, num_iovec,
1985                                                                 oparms);
1986                 else
1987                         return add_durable_v2_context(iov, num_iovec, oparms);
1988         }
1989
1990         if (oparms->reconnect) {
1991                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1992                 /* indicate that we don't need to relock the file */
1993                 oparms->reconnect = false;
1994         } else
1995                 iov[num].iov_base = create_durable_buf();
1996         if (iov[num].iov_base == NULL)
1997                 return -ENOMEM;
1998         iov[num].iov_len = sizeof(struct create_durable);
1999         if (!req->CreateContextsOffset)
2000                 req->CreateContextsOffset =
2001                         cpu_to_le32(sizeof(struct smb2_create_req) +
2002                                                                 iov[1].iov_len);
2003         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2004         *num_iovec = num + 1;
2005         return 0;
2006 }
2007
2008 /* See MS-SMB2 2.2.13.2.7 */
2009 static struct crt_twarp_ctxt *
2010 create_twarp_buf(__u64 timewarp)
2011 {
2012         struct crt_twarp_ctxt *buf;
2013
2014         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2015         if (!buf)
2016                 return NULL;
2017
2018         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2019                                         (struct crt_twarp_ctxt, Timestamp));
2020         buf->ccontext.DataLength = cpu_to_le32(8);
2021         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2022                                 (struct crt_twarp_ctxt, Name));
2023         buf->ccontext.NameLength = cpu_to_le16(4);
2024         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2025         buf->Name[0] = 'T';
2026         buf->Name[1] = 'W';
2027         buf->Name[2] = 'r';
2028         buf->Name[3] = 'p';
2029         buf->Timestamp = cpu_to_le64(timewarp);
2030         return buf;
2031 }
2032
2033 /* See MS-SMB2 2.2.13.2.7 */
2034 static int
2035 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2036 {
2037         struct smb2_create_req *req = iov[0].iov_base;
2038         unsigned int num = *num_iovec;
2039
2040         iov[num].iov_base = create_twarp_buf(timewarp);
2041         if (iov[num].iov_base == NULL)
2042                 return -ENOMEM;
2043         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2044         if (!req->CreateContextsOffset)
2045                 req->CreateContextsOffset = cpu_to_le32(
2046                                 sizeof(struct smb2_create_req) +
2047                                 iov[num - 1].iov_len);
2048         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2049         *num_iovec = num + 1;
2050         return 0;
2051 }
2052
2053 static int
2054 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2055                             const char *treename, const __le16 *path)
2056 {
2057         int treename_len, path_len;
2058         struct nls_table *cp;
2059         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2060
2061         /*
2062          * skip leading "\\"
2063          */
2064         treename_len = strlen(treename);
2065         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2066                 return -EINVAL;
2067
2068         treename += 2;
2069         treename_len -= 2;
2070
2071         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2072
2073         /*
2074          * make room for one path separator between the treename and
2075          * path
2076          */
2077         *out_len = treename_len + 1 + path_len;
2078
2079         /*
2080          * final path needs to be null-terminated UTF16 with a
2081          * size aligned to 8
2082          */
2083
2084         *out_size = roundup((*out_len+1)*2, 8);
2085         *out_path = kzalloc(*out_size, GFP_KERNEL);
2086         if (!*out_path)
2087                 return -ENOMEM;
2088
2089         cp = load_nls_default();
2090         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2091         UniStrcat(*out_path, sep);
2092         UniStrcat(*out_path, path);
2093         unload_nls(cp);
2094
2095         return 0;
2096 }
2097
2098 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2099                                umode_t mode, struct cifs_tcon *tcon,
2100                                const char *full_path,
2101                                struct cifs_sb_info *cifs_sb)
2102 {
2103         struct smb_rqst rqst;
2104         struct smb2_create_req *req;
2105         struct smb2_create_rsp *rsp = NULL;
2106         struct cifs_ses *ses = tcon->ses;
2107         struct kvec iov[3]; /* make sure at least one for each open context */
2108         struct kvec rsp_iov = {NULL, 0};
2109         int resp_buftype;
2110         int uni_path_len;
2111         __le16 *copy_path = NULL;
2112         int copy_size;
2113         int rc = 0;
2114         unsigned int n_iov = 2;
2115         __u32 file_attributes = 0;
2116         char *pc_buf = NULL;
2117         int flags = 0;
2118         unsigned int total_len;
2119         __le16 *utf16_path = NULL;
2120
2121         cifs_dbg(FYI, "mkdir\n");
2122
2123         /* resource #1: path allocation */
2124         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2125         if (!utf16_path)
2126                 return -ENOMEM;
2127
2128         if (!ses || !(ses->server)) {
2129                 rc = -EIO;
2130                 goto err_free_path;
2131         }
2132
2133         /* resource #2: request */
2134         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2135         if (rc)
2136                 goto err_free_path;
2137
2138
2139         if (smb3_encryption_required(tcon))
2140                 flags |= CIFS_TRANSFORM_REQ;
2141
2142         req->ImpersonationLevel = IL_IMPERSONATION;
2143         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2144         /* File attributes ignored on open (used in create though) */
2145         req->FileAttributes = cpu_to_le32(file_attributes);
2146         req->ShareAccess = FILE_SHARE_ALL_LE;
2147         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2148         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2149
2150         iov[0].iov_base = (char *)req;
2151         /* -1 since last byte is buf[0] which is sent below (path) */
2152         iov[0].iov_len = total_len - 1;
2153
2154         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2155
2156         /* [MS-SMB2] 2.2.13 NameOffset:
2157          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2158          * the SMB2 header, the file name includes a prefix that will
2159          * be processed during DFS name normalization as specified in
2160          * section 3.3.5.9. Otherwise, the file name is relative to
2161          * the share that is identified by the TreeId in the SMB2
2162          * header.
2163          */
2164         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2165                 int name_len;
2166
2167                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2168                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2169                                                  &name_len,
2170                                                  tcon->treeName, utf16_path);
2171                 if (rc)
2172                         goto err_free_req;
2173
2174                 req->NameLength = cpu_to_le16(name_len * 2);
2175                 uni_path_len = copy_size;
2176                 /* free before overwriting resource */
2177                 kfree(utf16_path);
2178                 utf16_path = copy_path;
2179         } else {
2180                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2181                 /* MUST set path len (NameLength) to 0 opening root of share */
2182                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2183                 if (uni_path_len % 8 != 0) {
2184                         copy_size = roundup(uni_path_len, 8);
2185                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2186                         if (!copy_path) {
2187                                 rc = -ENOMEM;
2188                                 goto err_free_req;
2189                         }
2190                         memcpy((char *)copy_path, (const char *)utf16_path,
2191                                uni_path_len);
2192                         uni_path_len = copy_size;
2193                         /* free before overwriting resource */
2194                         kfree(utf16_path);
2195                         utf16_path = copy_path;
2196                 }
2197         }
2198
2199         iov[1].iov_len = uni_path_len;
2200         iov[1].iov_base = utf16_path;
2201         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2202
2203         if (tcon->posix_extensions) {
2204                 /* resource #3: posix buf */
2205                 rc = add_posix_context(iov, &n_iov, mode);
2206                 if (rc)
2207                         goto err_free_req;
2208                 pc_buf = iov[n_iov-1].iov_base;
2209         }
2210
2211
2212         memset(&rqst, 0, sizeof(struct smb_rqst));
2213         rqst.rq_iov = iov;
2214         rqst.rq_nvec = n_iov;
2215
2216         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2217                                     FILE_WRITE_ATTRIBUTES);
2218         /* resource #4: response buffer */
2219         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2220         if (rc) {
2221                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2222                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2223                                            CREATE_NOT_FILE,
2224                                            FILE_WRITE_ATTRIBUTES, rc);
2225                 goto err_free_rsp_buf;
2226         }
2227
2228         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2229         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2230                                     ses->Suid, CREATE_NOT_FILE,
2231                                     FILE_WRITE_ATTRIBUTES);
2232
2233         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2234
2235         /* Eventually save off posix specific response info and timestaps */
2236
2237 err_free_rsp_buf:
2238         free_rsp_buf(resp_buftype, rsp);
2239         kfree(pc_buf);
2240 err_free_req:
2241         cifs_small_buf_release(req);
2242 err_free_path:
2243         kfree(utf16_path);
2244         return rc;
2245 }
2246
2247 int
2248 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2249                struct cifs_open_parms *oparms, __le16 *path)
2250 {
2251         struct TCP_Server_Info *server = tcon->ses->server;
2252         struct smb2_create_req *req;
2253         unsigned int n_iov = 2;
2254         __u32 file_attributes = 0;
2255         int copy_size;
2256         int uni_path_len;
2257         unsigned int total_len;
2258         struct kvec *iov = rqst->rq_iov;
2259         __le16 *copy_path;
2260         int rc;
2261
2262         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2263         if (rc)
2264                 return rc;
2265
2266         iov[0].iov_base = (char *)req;
2267         /* -1 since last byte is buf[0] which is sent below (path) */
2268         iov[0].iov_len = total_len - 1;
2269
2270         if (oparms->create_options & CREATE_OPTION_READONLY)
2271                 file_attributes |= ATTR_READONLY;
2272         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2273                 file_attributes |= ATTR_SYSTEM;
2274
2275         req->ImpersonationLevel = IL_IMPERSONATION;
2276         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
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(oparms->disposition);
2281         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2282         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2283
2284         /* [MS-SMB2] 2.2.13 NameOffset:
2285          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2286          * the SMB2 header, the file name includes a prefix that will
2287          * be processed during DFS name normalization as specified in
2288          * section 3.3.5.9. Otherwise, the file name is relative to
2289          * the share that is identified by the TreeId in the SMB2
2290          * header.
2291          */
2292         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2293                 int name_len;
2294
2295                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2296                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2297                                                  &name_len,
2298                                                  tcon->treeName, path);
2299                 if (rc)
2300                         return rc;
2301                 req->NameLength = cpu_to_le16(name_len * 2);
2302                 uni_path_len = copy_size;
2303                 path = copy_path;
2304         } else {
2305                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2306                 /* MUST set path len (NameLength) to 0 opening root of share */
2307                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2308                 copy_size = uni_path_len;
2309                 if (copy_size % 8 != 0)
2310                         copy_size = roundup(copy_size, 8);
2311                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2312                 if (!copy_path)
2313                         return -ENOMEM;
2314                 memcpy((char *)copy_path, (const char *)path,
2315                        uni_path_len);
2316                 uni_path_len = copy_size;
2317                 path = copy_path;
2318         }
2319
2320         iov[1].iov_len = uni_path_len;
2321         iov[1].iov_base = path;
2322
2323         if (!server->oplocks)
2324                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2325
2326         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2327             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2328                 req->RequestedOplockLevel = *oplock;
2329         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2330                   (oparms->create_options & CREATE_NOT_FILE))
2331                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2332         else {
2333                 rc = add_lease_context(server, iov, &n_iov,
2334                                        oparms->fid->lease_key, oplock);
2335                 if (rc)
2336                         return rc;
2337         }
2338
2339         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2340                 /* need to set Next field of lease context if we request it */
2341                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2342                         struct create_context *ccontext =
2343                             (struct create_context *)iov[n_iov-1].iov_base;
2344                         ccontext->Next =
2345                                 cpu_to_le32(server->vals->create_lease_size);
2346                 }
2347
2348                 rc = add_durable_context(iov, &n_iov, oparms,
2349                                         tcon->use_persistent);
2350                 if (rc)
2351                         return rc;
2352         }
2353
2354         if (tcon->posix_extensions) {
2355                 if (n_iov > 2) {
2356                         struct create_context *ccontext =
2357                             (struct create_context *)iov[n_iov-1].iov_base;
2358                         ccontext->Next =
2359                                 cpu_to_le32(iov[n_iov-1].iov_len);
2360                 }
2361
2362                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2363                 if (rc)
2364                         return rc;
2365         }
2366
2367         if (tcon->snapshot_time) {
2368                 cifs_dbg(FYI, "adding snapshot context\n");
2369                 if (n_iov > 2) {
2370                         struct create_context *ccontext =
2371                             (struct create_context *)iov[n_iov-1].iov_base;
2372                         ccontext->Next =
2373                                 cpu_to_le32(iov[n_iov-1].iov_len);
2374                 }
2375
2376                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2377                 if (rc)
2378                         return rc;
2379         }
2380
2381
2382         rqst->rq_nvec = n_iov;
2383         return 0;
2384 }
2385
2386 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2387  * All other vectors are freed by kfree().
2388  */
2389 void
2390 SMB2_open_free(struct smb_rqst *rqst)
2391 {
2392         int i;
2393
2394         if (rqst && rqst->rq_iov) {
2395                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2396                 for (i = 1; i < rqst->rq_nvec; i++)
2397                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2398                                 kfree(rqst->rq_iov[i].iov_base);
2399         }
2400 }
2401
2402 int
2403 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2404           __u8 *oplock, struct smb2_file_all_info *buf,
2405           struct kvec *err_iov, int *buftype)
2406 {
2407         struct smb_rqst rqst;
2408         struct smb2_create_rsp *rsp = NULL;
2409         struct TCP_Server_Info *server;
2410         struct cifs_tcon *tcon = oparms->tcon;
2411         struct cifs_ses *ses = tcon->ses;
2412         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2413         struct kvec rsp_iov = {NULL, 0};
2414         int resp_buftype = CIFS_NO_BUFFER;
2415         int rc = 0;
2416         int flags = 0;
2417
2418         cifs_dbg(FYI, "create/open\n");
2419         if (ses && (ses->server))
2420                 server = ses->server;
2421         else
2422                 return -EIO;
2423
2424         if (smb3_encryption_required(tcon))
2425                 flags |= CIFS_TRANSFORM_REQ;
2426
2427         memset(&rqst, 0, sizeof(struct smb_rqst));
2428         memset(&iov, 0, sizeof(iov));
2429         rqst.rq_iov = iov;
2430         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2431
2432         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2433         if (rc)
2434                 goto creat_exit;
2435
2436         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2437                 oparms->create_options, oparms->desired_access);
2438
2439         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2440                             &rsp_iov);
2441         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2442
2443         if (rc != 0) {
2444                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2445                 if (err_iov && rsp) {
2446                         *err_iov = rsp_iov;
2447                         *buftype = resp_buftype;
2448                         resp_buftype = CIFS_NO_BUFFER;
2449                         rsp = NULL;
2450                 }
2451                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2452                                     oparms->create_options, oparms->desired_access, rc);
2453                 goto creat_exit;
2454         } else
2455                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2456                                      ses->Suid, oparms->create_options,
2457                                      oparms->desired_access);
2458
2459         atomic_inc(&tcon->num_remote_opens);
2460         oparms->fid->persistent_fid = rsp->PersistentFileId;
2461         oparms->fid->volatile_fid = rsp->VolatileFileId;
2462 #ifdef CONFIG_CIFS_DEBUG2
2463         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2464 #endif /* CIFS_DEBUG2 */
2465
2466         if (buf) {
2467                 memcpy(buf, &rsp->CreationTime, 32);
2468                 buf->AllocationSize = rsp->AllocationSize;
2469                 buf->EndOfFile = rsp->EndofFile;
2470                 buf->Attributes = rsp->FileAttributes;
2471                 buf->NumberOfLinks = cpu_to_le32(1);
2472                 buf->DeletePending = 0;
2473         }
2474
2475         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
2476                 *oplock = smb2_parse_lease_state(server, rsp,
2477                                                  &oparms->fid->epoch,
2478                                                  oparms->fid->lease_key);
2479         else
2480                 *oplock = rsp->OplockLevel;
2481 creat_exit:
2482         SMB2_open_free(&rqst);
2483         free_rsp_buf(resp_buftype, rsp);
2484         return rc;
2485 }
2486
2487 int
2488 SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2489                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2490                 bool is_fsctl, char *in_data, u32 indatalen,
2491                 __u32 max_response_size)
2492 {
2493         struct smb2_ioctl_req *req;
2494         struct kvec *iov = rqst->rq_iov;
2495         unsigned int total_len;
2496         int rc;
2497
2498         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2499         if (rc)
2500                 return rc;
2501
2502         req->CtlCode = cpu_to_le32(opcode);
2503         req->PersistentFileId = persistent_fid;
2504         req->VolatileFileId = volatile_fid;
2505
2506         iov[0].iov_base = (char *)req;
2507         /*
2508          * If no input data, the size of ioctl struct in
2509          * protocol spec still includes a 1 byte data buffer,
2510          * but if input data passed to ioctl, we do not
2511          * want to double count this, so we do not send
2512          * the dummy one byte of data in iovec[0] if sending
2513          * input data (in iovec[1]).
2514          */
2515         if (indatalen) {
2516                 req->InputCount = cpu_to_le32(indatalen);
2517                 /* do not set InputOffset if no input data */
2518                 req->InputOffset =
2519                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2520                 rqst->rq_nvec = 2;
2521                 iov[0].iov_len = total_len - 1;
2522                 iov[1].iov_base = in_data;
2523                 iov[1].iov_len = indatalen;
2524         } else {
2525                 rqst->rq_nvec = 1;
2526                 iov[0].iov_len = total_len;
2527         }
2528
2529         req->OutputOffset = 0;
2530         req->OutputCount = 0; /* MBZ */
2531
2532         /*
2533          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
2534          * We Could increase default MaxOutputResponse, but that could require
2535          * more credits. Windows typically sets this smaller, but for some
2536          * ioctls it may be useful to allow server to send more. No point
2537          * limiting what the server can send as long as fits in one credit
2538          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
2539          * to increase this limit up in the future.
2540          * Note that for snapshot queries that servers like Azure expect that
2541          * the first query be minimal size (and just used to get the number/size
2542          * of previous versions) so response size must be specified as EXACTLY
2543          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2544          * of eight bytes.  Currently that is the only case where we set max
2545          * response size smaller.
2546          */
2547         req->MaxOutputResponse = cpu_to_le32(max_response_size);
2548
2549         if (is_fsctl)
2550                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2551         else
2552                 req->Flags = 0;
2553
2554         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2555         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2556                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2557
2558         return 0;
2559 }
2560
2561 void
2562 SMB2_ioctl_free(struct smb_rqst *rqst)
2563 {
2564         if (rqst && rqst->rq_iov)
2565                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2566 }
2567
2568
2569 /*
2570  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2571  */
2572 int
2573 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2574            u64 volatile_fid, u32 opcode, bool is_fsctl,
2575            char *in_data, u32 indatalen, u32 max_out_data_len,
2576            char **out_data, u32 *plen /* returned data len */)
2577 {
2578         struct smb_rqst rqst;
2579         struct smb2_ioctl_rsp *rsp = NULL;
2580         struct cifs_ses *ses;
2581         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
2582         struct kvec rsp_iov = {NULL, 0};
2583         int resp_buftype = CIFS_NO_BUFFER;
2584         int rc = 0;
2585         int flags = 0;
2586
2587         cifs_dbg(FYI, "SMB2 IOCTL\n");
2588
2589         if (out_data != NULL)
2590                 *out_data = NULL;
2591
2592         /* zero out returned data len, in case of error */
2593         if (plen)
2594                 *plen = 0;
2595
2596         if (tcon)
2597                 ses = tcon->ses;
2598         else
2599                 return -EIO;
2600
2601         if (!ses || !(ses->server))
2602                 return -EIO;
2603
2604         if (smb3_encryption_required(tcon))
2605                 flags |= CIFS_TRANSFORM_REQ;
2606
2607         memset(&rqst, 0, sizeof(struct smb_rqst));
2608         memset(&iov, 0, sizeof(iov));
2609         rqst.rq_iov = iov;
2610         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
2611
2612         rc = SMB2_ioctl_init(tcon, &rqst, persistent_fid, volatile_fid, opcode,
2613                              is_fsctl, in_data, indatalen, max_out_data_len);
2614         if (rc)
2615                 goto ioctl_exit;
2616
2617         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2618                             &rsp_iov);
2619         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2620
2621         if (rc != 0)
2622                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2623                                 ses->Suid, 0, opcode, rc);
2624
2625         if ((rc != 0) && (rc != -EINVAL)) {
2626                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2627                 goto ioctl_exit;
2628         } else if (rc == -EINVAL) {
2629                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2630                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2631                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2632                         goto ioctl_exit;
2633                 }
2634         }
2635
2636         /* check if caller wants to look at return data or just return rc */
2637         if ((plen == NULL) || (out_data == NULL))
2638                 goto ioctl_exit;
2639
2640         *plen = le32_to_cpu(rsp->OutputCount);
2641
2642         /* We check for obvious errors in the output buffer length and offset */
2643         if (*plen == 0)
2644                 goto ioctl_exit; /* server returned no data */
2645         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
2646                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2647                 *plen = 0;
2648                 rc = -EIO;
2649                 goto ioctl_exit;
2650         }
2651
2652         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
2653                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2654                         le32_to_cpu(rsp->OutputOffset));
2655                 *plen = 0;
2656                 rc = -EIO;
2657                 goto ioctl_exit;
2658         }
2659
2660         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
2661                             *plen, GFP_KERNEL);
2662         if (*out_data == NULL) {
2663                 rc = -ENOMEM;
2664                 goto ioctl_exit;
2665         }
2666
2667 ioctl_exit:
2668         SMB2_ioctl_free(&rqst);
2669         free_rsp_buf(resp_buftype, rsp);
2670         return rc;
2671 }
2672
2673 /*
2674  *   Individual callers to ioctl worker function follow
2675  */
2676
2677 int
2678 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2679                      u64 persistent_fid, u64 volatile_fid)
2680 {
2681         int rc;
2682         struct  compress_ioctl fsctl_input;
2683         char *ret_data = NULL;
2684
2685         fsctl_input.CompressionState =
2686                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2687
2688         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2689                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2690                         (char *)&fsctl_input /* data input */,
2691                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
2692                         &ret_data /* out data */, NULL);
2693
2694         cifs_dbg(FYI, "set compression rc %d\n", rc);
2695
2696         return rc;
2697 }
2698
2699 int
2700 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2701                 u64 persistent_fid, u64 volatile_fid)
2702 {
2703         struct smb2_close_req *req;
2704         struct kvec *iov = rqst->rq_iov;
2705         unsigned int total_len;
2706         int rc;
2707
2708         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2709         if (rc)
2710                 return rc;
2711
2712         req->PersistentFileId = persistent_fid;
2713         req->VolatileFileId = volatile_fid;
2714         iov[0].iov_base = (char *)req;
2715         iov[0].iov_len = total_len;
2716
2717         return 0;
2718 }
2719
2720 void
2721 SMB2_close_free(struct smb_rqst *rqst)
2722 {
2723         if (rqst && rqst->rq_iov)
2724                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2725 }
2726
2727 int
2728 SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2729                  u64 persistent_fid, u64 volatile_fid, int flags)
2730 {
2731         struct smb_rqst rqst;
2732         struct smb2_close_rsp *rsp = NULL;
2733         struct cifs_ses *ses = tcon->ses;
2734         struct kvec iov[1];
2735         struct kvec rsp_iov;
2736         int resp_buftype = CIFS_NO_BUFFER;
2737         int rc = 0;
2738
2739         cifs_dbg(FYI, "Close\n");
2740
2741         if (!ses || !(ses->server))
2742                 return -EIO;
2743
2744         if (smb3_encryption_required(tcon))
2745                 flags |= CIFS_TRANSFORM_REQ;
2746
2747         memset(&rqst, 0, sizeof(struct smb_rqst));
2748         memset(&iov, 0, sizeof(iov));
2749         rqst.rq_iov = iov;
2750         rqst.rq_nvec = 1;
2751
2752         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
2753         if (rc)
2754                 goto close_exit;
2755
2756         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2757         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2758
2759         if (rc != 0) {
2760                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2761                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2762                                      rc);
2763                 goto close_exit;
2764         }
2765
2766         atomic_dec(&tcon->num_remote_opens);
2767
2768         /* BB FIXME - decode close response, update inode for caching */
2769
2770 close_exit:
2771         SMB2_close_free(&rqst);
2772         free_rsp_buf(resp_buftype, rsp);
2773         return rc;
2774 }
2775
2776 int
2777 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2778            u64 persistent_fid, u64 volatile_fid)
2779 {
2780         return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2781 }
2782
2783 int
2784 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
2785                   struct kvec *iov, unsigned int min_buf_size)
2786 {
2787         unsigned int smb_len = iov->iov_len;
2788         char *end_of_smb = smb_len + (char *)iov->iov_base;
2789         char *begin_of_buf = offset + (char *)iov->iov_base;
2790         char *end_of_buf = begin_of_buf + buffer_length;
2791
2792
2793         if (buffer_length < min_buf_size) {
2794                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2795                          buffer_length, min_buf_size);
2796                 return -EINVAL;
2797         }
2798
2799         /* check if beyond RFC1001 maximum length */
2800         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2801                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2802                          buffer_length, smb_len);
2803                 return -EINVAL;
2804         }
2805
2806         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2807                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2808                 return -EINVAL;
2809         }
2810
2811         return 0;
2812 }
2813
2814 /*
2815  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2816  * Caller must free buffer.
2817  */
2818 int
2819 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
2820                            struct kvec *iov, unsigned int minbufsize,
2821                            char *data)
2822 {
2823         char *begin_of_buf = offset + (char *)iov->iov_base;
2824         int rc;
2825
2826         if (!data)
2827                 return -EINVAL;
2828
2829         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
2830         if (rc)
2831                 return rc;
2832
2833         memcpy(data, begin_of_buf, buffer_length);
2834
2835         return 0;
2836 }
2837
2838 int
2839 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2840                      u64 persistent_fid, u64 volatile_fid,
2841                      u8 info_class, u8 info_type, u32 additional_info,
2842                      size_t output_len, size_t input_len, void *input)
2843 {
2844         struct smb2_query_info_req *req;
2845         struct kvec *iov = rqst->rq_iov;
2846         unsigned int total_len;
2847         int rc;
2848
2849         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2850                              &total_len);
2851         if (rc)
2852                 return rc;
2853
2854         req->InfoType = info_type;
2855         req->FileInfoClass = info_class;
2856         req->PersistentFileId = persistent_fid;
2857         req->VolatileFileId = volatile_fid;
2858         req->AdditionalInformation = cpu_to_le32(additional_info);
2859
2860         req->OutputBufferLength = cpu_to_le32(output_len);
2861         if (input_len) {
2862                 req->InputBufferLength = cpu_to_le32(input_len);
2863                 /* total_len for smb query request never close to le16 max */
2864                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
2865                 memcpy(req->Buffer, input, input_len);
2866         }
2867
2868         iov[0].iov_base = (char *)req;
2869         /* 1 for Buffer */
2870         iov[0].iov_len = total_len - 1 + input_len;
2871         return 0;
2872 }
2873
2874 void
2875 SMB2_query_info_free(struct smb_rqst *rqst)
2876 {
2877         if (rqst && rqst->rq_iov)
2878                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2879 }
2880
2881 static int
2882 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2883            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2884            u32 additional_info, size_t output_len, size_t min_len, void **data,
2885                 u32 *dlen)
2886 {
2887         struct smb_rqst rqst;
2888         struct smb2_query_info_rsp *rsp = NULL;
2889         struct kvec iov[1];
2890         struct kvec rsp_iov;
2891         int rc = 0;
2892         int resp_buftype = CIFS_NO_BUFFER;
2893         struct cifs_ses *ses = tcon->ses;
2894         int flags = 0;
2895         bool allocated = false;
2896
2897         cifs_dbg(FYI, "Query Info\n");
2898
2899         if (!ses || !(ses->server))
2900                 return -EIO;
2901
2902         if (smb3_encryption_required(tcon))
2903                 flags |= CIFS_TRANSFORM_REQ;
2904
2905         memset(&rqst, 0, sizeof(struct smb_rqst));
2906         memset(&iov, 0, sizeof(iov));
2907         rqst.rq_iov = iov;
2908         rqst.rq_nvec = 1;
2909
2910         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
2911                                   info_class, info_type, additional_info,
2912                                   output_len, 0, NULL);
2913         if (rc)
2914                 goto qinf_exit;
2915
2916         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
2917                                     ses->Suid, info_class, (__u32)info_type);
2918
2919         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2920         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2921
2922         if (rc) {
2923                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2924                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
2925                                 ses->Suid, info_class, (__u32)info_type, rc);
2926                 goto qinf_exit;
2927         }
2928
2929         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
2930                                 ses->Suid, info_class, (__u32)info_type);
2931
2932         if (dlen) {
2933                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2934                 if (!*data) {
2935                         *data = kmalloc(*dlen, GFP_KERNEL);
2936                         if (!*data) {
2937                                 cifs_dbg(VFS,
2938                                         "Error %d allocating memory for acl\n",
2939                                         rc);
2940                                 *dlen = 0;
2941                                 rc = -ENOMEM;
2942                                 goto qinf_exit;
2943                         }
2944                         allocated = true;
2945                 }
2946         }
2947
2948         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
2949                                         le32_to_cpu(rsp->OutputBufferLength),
2950                                         &rsp_iov, min_len, *data);
2951         if (rc && allocated) {
2952                 kfree(*data);
2953                 *data = NULL;
2954                 *dlen = 0;
2955         }
2956
2957 qinf_exit:
2958         SMB2_query_info_free(&rqst);
2959         free_rsp_buf(resp_buftype, rsp);
2960         return rc;
2961 }
2962
2963 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2964         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2965 {
2966         return query_info(xid, tcon, persistent_fid, volatile_fid,
2967                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2968                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2969                           sizeof(struct smb2_file_all_info), (void **)&data,
2970                           NULL);
2971 }
2972
2973 int
2974 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2975                 u64 persistent_fid, u64 volatile_fid,
2976                 void **data, u32 *plen)
2977 {
2978         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2979         *plen = 0;
2980
2981         return query_info(xid, tcon, persistent_fid, volatile_fid,
2982                           0, SMB2_O_INFO_SECURITY, additional_info,
2983                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
2984 }
2985
2986 int
2987 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2988                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2989 {
2990         return query_info(xid, tcon, persistent_fid, volatile_fid,
2991                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2992                           sizeof(struct smb2_file_internal_info),
2993                           sizeof(struct smb2_file_internal_info),
2994                           (void **)&uniqueid, NULL);
2995 }
2996
2997 /*
2998  * This is a no-op for now. We're not really interested in the reply, but
2999  * rather in the fact that the server sent one and that server->lstrp
3000  * gets updated.
3001  *
3002  * FIXME: maybe we should consider checking that the reply matches request?
3003  */
3004 static void
3005 smb2_echo_callback(struct mid_q_entry *mid)
3006 {
3007         struct TCP_Server_Info *server = mid->callback_data;
3008         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3009         struct cifs_credits credits = { .value = 0, .instance = 0 };
3010
3011         if (mid->mid_state == MID_RESPONSE_RECEIVED
3012             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3013                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3014                 credits.instance = server->reconnect_instance;
3015         }
3016
3017         DeleteMidQEntry(mid);
3018         add_credits(server, &credits, CIFS_ECHO_OP);
3019 }
3020
3021 void smb2_reconnect_server(struct work_struct *work)
3022 {
3023         struct TCP_Server_Info *server = container_of(work,
3024                                         struct TCP_Server_Info, reconnect.work);
3025         struct cifs_ses *ses;
3026         struct cifs_tcon *tcon, *tcon2;
3027         struct list_head tmp_list;
3028         int tcon_exist = false;
3029         int rc;
3030         int resched = false;
3031
3032
3033         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3034         mutex_lock(&server->reconnect_mutex);
3035
3036         INIT_LIST_HEAD(&tmp_list);
3037         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3038
3039         spin_lock(&cifs_tcp_ses_lock);
3040         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3041                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3042                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3043                                 tcon->tc_count++;
3044                                 list_add_tail(&tcon->rlist, &tmp_list);
3045                                 tcon_exist = true;
3046                         }
3047                 }
3048                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3049                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3050                         tcon_exist = true;
3051                 }
3052         }
3053         /*
3054          * Get the reference to server struct to be sure that the last call of
3055          * cifs_put_tcon() in the loop below won't release the server pointer.
3056          */
3057         if (tcon_exist)
3058                 server->srv_count++;
3059
3060         spin_unlock(&cifs_tcp_ses_lock);
3061
3062         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3063                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
3064                 if (!rc)
3065                         cifs_reopen_persistent_handles(tcon);
3066                 else
3067                         resched = true;
3068                 list_del_init(&tcon->rlist);
3069                 cifs_put_tcon(tcon);
3070         }
3071
3072         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3073         if (resched)
3074                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3075         mutex_unlock(&server->reconnect_mutex);
3076
3077         /* now we can safely release srv struct */
3078         if (tcon_exist)
3079                 cifs_put_tcp_session(server, 1);
3080 }
3081
3082 int
3083 SMB2_echo(struct TCP_Server_Info *server)
3084 {
3085         struct smb2_echo_req *req;
3086         int rc = 0;
3087         struct kvec iov[1];
3088         struct smb_rqst rqst = { .rq_iov = iov,
3089                                  .rq_nvec = 1 };
3090         unsigned int total_len;
3091
3092         cifs_dbg(FYI, "In echo request\n");
3093
3094         if (server->tcpStatus == CifsNeedNegotiate) {
3095                 /* No need to send echo on newly established connections */
3096                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
3097                 return rc;
3098         }
3099
3100         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
3101         if (rc)
3102                 return rc;
3103
3104         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3105
3106         iov[0].iov_len = total_len;
3107         iov[0].iov_base = (char *)req;
3108
3109         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3110                              server, CIFS_ECHO_OP, NULL);
3111         if (rc)
3112                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3113
3114         cifs_small_buf_release(req);
3115         return rc;
3116 }
3117
3118 int
3119 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3120            u64 volatile_fid)
3121 {
3122         struct smb_rqst rqst;
3123         struct smb2_flush_req *req;
3124         struct cifs_ses *ses = tcon->ses;
3125         struct kvec iov[1];
3126         struct kvec rsp_iov;
3127         int resp_buftype;
3128         int rc = 0;
3129         int flags = 0;
3130         unsigned int total_len;
3131
3132         cifs_dbg(FYI, "Flush\n");
3133
3134         if (!ses || !(ses->server))
3135                 return -EIO;
3136
3137         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
3138         if (rc)
3139                 return rc;
3140
3141         if (smb3_encryption_required(tcon))
3142                 flags |= CIFS_TRANSFORM_REQ;
3143
3144         req->PersistentFileId = persistent_fid;
3145         req->VolatileFileId = volatile_fid;
3146
3147         iov[0].iov_base = (char *)req;
3148         iov[0].iov_len = total_len;
3149
3150         memset(&rqst, 0, sizeof(struct smb_rqst));
3151         rqst.rq_iov = iov;
3152         rqst.rq_nvec = 1;
3153
3154         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3155         cifs_small_buf_release(req);
3156
3157         if (rc != 0) {
3158                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3159                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3160                                      rc);
3161         }
3162
3163         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3164         return rc;
3165 }
3166
3167 /*
3168  * To form a chain of read requests, any read requests after the first should
3169  * have the end_of_chain boolean set to true.
3170  */
3171 static int
3172 smb2_new_read_req(void **buf, unsigned int *total_len,
3173         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3174         unsigned int remaining_bytes, int request_type)
3175 {
3176         int rc = -EACCES;
3177         struct smb2_read_plain_req *req = NULL;
3178         struct smb2_sync_hdr *shdr;
3179         struct TCP_Server_Info *server;
3180
3181         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
3182                                  total_len);
3183         if (rc)
3184                 return rc;
3185
3186         server = io_parms->tcon->ses->server;
3187         if (server == NULL)
3188                 return -ECONNABORTED;
3189
3190         shdr = &req->sync_hdr;
3191         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3192
3193         req->PersistentFileId = io_parms->persistent_fid;
3194         req->VolatileFileId = io_parms->volatile_fid;
3195         req->ReadChannelInfoOffset = 0; /* reserved */
3196         req->ReadChannelInfoLength = 0; /* reserved */
3197         req->Channel = 0; /* reserved */
3198         req->MinimumCount = 0;
3199         req->Length = cpu_to_le32(io_parms->length);
3200         req->Offset = cpu_to_le64(io_parms->offset);
3201
3202         trace_smb3_read_enter(0 /* xid */,
3203                         io_parms->persistent_fid,
3204                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3205                         io_parms->offset, io_parms->length);
3206 #ifdef CONFIG_CIFS_SMB_DIRECT
3207         /*
3208          * If we want to do a RDMA write, fill in and append
3209          * smbd_buffer_descriptor_v1 to the end of read request
3210          */
3211         if (server->rdma && rdata && !server->sign &&
3212                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3213
3214                 struct smbd_buffer_descriptor_v1 *v1;
3215                 bool need_invalidate =
3216                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3217
3218                 rdata->mr = smbd_register_mr(
3219                                 server->smbd_conn, rdata->pages,
3220                                 rdata->nr_pages, rdata->page_offset,
3221                                 rdata->tailsz, true, need_invalidate);
3222                 if (!rdata->mr)
3223                         return -ENOBUFS;
3224
3225                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3226                 if (need_invalidate)
3227                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3228                 req->ReadChannelInfoOffset =
3229                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3230                 req->ReadChannelInfoLength =
3231                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3232                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3233                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3234                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3235                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3236
3237                 *total_len += sizeof(*v1) - 1;
3238         }
3239 #endif
3240         if (request_type & CHAINED_REQUEST) {
3241                 if (!(request_type & END_OF_CHAIN)) {
3242                         /* next 8-byte aligned request */
3243                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3244                         shdr->NextCommand = cpu_to_le32(*total_len);
3245                 } else /* END_OF_CHAIN */
3246                         shdr->NextCommand = 0;
3247                 if (request_type & RELATED_REQUEST) {
3248                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3249                         /*
3250                          * Related requests use info from previous read request
3251                          * in chain.
3252                          */
3253                         shdr->SessionId = 0xFFFFFFFF;
3254                         shdr->TreeId = 0xFFFFFFFF;
3255                         req->PersistentFileId = 0xFFFFFFFF;
3256                         req->VolatileFileId = 0xFFFFFFFF;
3257                 }
3258         }
3259         if (remaining_bytes > io_parms->length)
3260                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3261         else
3262                 req->RemainingBytes = 0;
3263
3264         *buf = req;
3265         return rc;
3266 }
3267
3268 static void
3269 smb2_readv_callback(struct mid_q_entry *mid)
3270 {
3271         struct cifs_readdata *rdata = mid->callback_data;
3272         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3273         struct TCP_Server_Info *server = tcon->ses->server;
3274         struct smb2_sync_hdr *shdr =
3275                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3276         struct cifs_credits credits = { .value = 0, .instance = 0 };
3277         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3278                                  .rq_nvec = 2,
3279                                  .rq_pages = rdata->pages,
3280                                  .rq_offset = rdata->page_offset,
3281                                  .rq_npages = rdata->nr_pages,
3282                                  .rq_pagesz = rdata->pagesz,
3283                                  .rq_tailsz = rdata->tailsz };
3284
3285         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3286                  __func__, mid->mid, mid->mid_state, rdata->result,
3287                  rdata->bytes);
3288
3289         switch (mid->mid_state) {
3290         case MID_RESPONSE_RECEIVED:
3291                 credits.value = le16_to_cpu(shdr->CreditRequest);
3292                 credits.instance = server->reconnect_instance;
3293                 /* result already set, check signature */
3294                 if (server->sign && !mid->decrypted) {
3295                         int rc;
3296
3297                         rc = smb2_verify_signature(&rqst, server);
3298                         if (rc)
3299                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
3300                                          rc);
3301                 }
3302                 /* FIXME: should this be counted toward the initiating task? */
3303                 task_io_account_read(rdata->got_bytes);
3304                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3305                 break;
3306         case MID_REQUEST_SUBMITTED:
3307         case MID_RETRY_NEEDED:
3308                 rdata->result = -EAGAIN;
3309                 if (server->sign && rdata->got_bytes)
3310                         /* reset bytes number since we can not check a sign */
3311                         rdata->got_bytes = 0;
3312                 /* FIXME: should this be counted toward the initiating task? */
3313                 task_io_account_read(rdata->got_bytes);
3314                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3315                 break;
3316         case MID_RESPONSE_MALFORMED:
3317                 credits.value = le16_to_cpu(shdr->CreditRequest);
3318                 credits.instance = server->reconnect_instance;
3319                 /* fall through */
3320         default:
3321                 rdata->result = -EIO;
3322         }
3323 #ifdef CONFIG_CIFS_SMB_DIRECT
3324         /*
3325          * If this rdata has a memmory registered, the MR can be freed
3326          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3327          * because they have limited number and are used for future I/Os
3328          */
3329         if (rdata->mr) {
3330                 smbd_deregister_mr(rdata->mr);
3331                 rdata->mr = NULL;
3332         }
3333 #endif
3334         if (rdata->result && rdata->result != -ENODATA) {
3335                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3336                 trace_smb3_read_err(0 /* xid */,
3337                                     rdata->cfile->fid.persistent_fid,
3338                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3339                                     rdata->bytes, rdata->result);
3340         } else
3341                 trace_smb3_read_done(0 /* xid */,
3342                                      rdata->cfile->fid.persistent_fid,
3343                                      tcon->tid, tcon->ses->Suid,
3344                                      rdata->offset, rdata->got_bytes);
3345
3346         queue_work(cifsiod_wq, &rdata->work);
3347         DeleteMidQEntry(mid);
3348         add_credits(server, &credits, 0);
3349 }
3350
3351 /* smb2_async_readv - send an async read, and set up mid to handle result */
3352 int
3353 smb2_async_readv(struct cifs_readdata *rdata)
3354 {
3355         int rc, flags = 0;
3356         char *buf;
3357         struct smb2_sync_hdr *shdr;
3358         struct cifs_io_parms io_parms;
3359         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3360                                  .rq_nvec = 1 };
3361         struct TCP_Server_Info *server;
3362         unsigned int total_len;
3363
3364         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3365                  __func__, rdata->offset, rdata->bytes);
3366
3367         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3368         io_parms.offset = rdata->offset;
3369         io_parms.length = rdata->bytes;
3370         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3371         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3372         io_parms.pid = rdata->pid;
3373
3374         server = io_parms.tcon->ses->server;
3375
3376         rc = smb2_new_read_req(
3377                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3378         if (rc)
3379                 return rc;
3380
3381         if (smb3_encryption_required(io_parms.tcon))
3382                 flags |= CIFS_TRANSFORM_REQ;
3383
3384         rdata->iov[0].iov_base = buf;
3385         rdata->iov[0].iov_len = total_len;
3386
3387         shdr = (struct smb2_sync_hdr *)buf;
3388
3389         if (rdata->credits.value > 0) {
3390                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3391                                                 SMB2_MAX_BUFFER_SIZE));
3392                 shdr->CreditRequest =
3393                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3394
3395                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
3396                 if (rc)
3397                         goto async_readv_out;
3398
3399                 flags |= CIFS_HAS_CREDITS;
3400         }
3401
3402         kref_get(&rdata->refcount);
3403         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3404                              cifs_readv_receive, smb2_readv_callback,
3405                              smb3_handle_read_data, rdata, flags,
3406                              &rdata->credits);
3407         if (rc) {
3408                 kref_put(&rdata->refcount, cifs_readdata_release);
3409                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3410                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
3411                                     io_parms.tcon->tid,
3412                                     io_parms.tcon->ses->Suid,
3413                                     io_parms.offset, io_parms.length, rc);
3414         }
3415
3416 async_readv_out:
3417         cifs_small_buf_release(buf);
3418         return rc;
3419 }
3420
3421 int
3422 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3423           unsigned int *nbytes, char **buf, int *buf_type)
3424 {
3425         struct smb_rqst rqst;
3426         int resp_buftype, rc = -EACCES;
3427         struct smb2_read_plain_req *req = NULL;
3428         struct smb2_read_rsp *rsp = NULL;
3429         struct kvec iov[1];
3430         struct kvec rsp_iov;
3431         unsigned int total_len;
3432         int flags = CIFS_LOG_ERROR;
3433         struct cifs_ses *ses = io_parms->tcon->ses;
3434
3435         *nbytes = 0;
3436         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3437         if (rc)
3438                 return rc;
3439
3440         if (smb3_encryption_required(io_parms->tcon))
3441                 flags |= CIFS_TRANSFORM_REQ;
3442
3443         iov[0].iov_base = (char *)req;
3444         iov[0].iov_len = total_len;
3445
3446         memset(&rqst, 0, sizeof(struct smb_rqst));
3447         rqst.rq_iov = iov;
3448         rqst.rq_nvec = 1;
3449
3450         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3451         cifs_small_buf_release(req);
3452
3453         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3454
3455         if (rc) {
3456                 if (rc != -ENODATA) {
3457                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3458                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3459                         trace_smb3_read_err(xid, req->PersistentFileId,
3460                                             io_parms->tcon->tid, ses->Suid,
3461                                             io_parms->offset, io_parms->length,
3462                                             rc);
3463                 } else
3464                         trace_smb3_read_done(xid, req->PersistentFileId,
3465                                     io_parms->tcon->tid, ses->Suid,
3466                                     io_parms->offset, 0);
3467                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3468                 return rc == -ENODATA ? 0 : rc;
3469         } else
3470                 trace_smb3_read_done(xid, req->PersistentFileId,
3471                                     io_parms->tcon->tid, ses->Suid,
3472                                     io_parms->offset, io_parms->length);
3473
3474         *nbytes = le32_to_cpu(rsp->DataLength);
3475         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3476             (*nbytes > io_parms->length)) {
3477                 cifs_dbg(FYI, "bad length %d for count %d\n",
3478                          *nbytes, io_parms->length);
3479                 rc = -EIO;
3480                 *nbytes = 0;
3481         }
3482
3483         if (*buf) {
3484                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3485                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3486         } else if (resp_buftype != CIFS_NO_BUFFER) {
3487                 *buf = rsp_iov.iov_base;
3488                 if (resp_buftype == CIFS_SMALL_BUFFER)
3489                         *buf_type = CIFS_SMALL_BUFFER;
3490                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3491                         *buf_type = CIFS_LARGE_BUFFER;
3492         }
3493         return rc;
3494 }
3495
3496 /*
3497  * Check the mid_state and signature on received buffer (if any), and queue the
3498  * workqueue completion task.
3499  */
3500 static void
3501 smb2_writev_callback(struct mid_q_entry *mid)
3502 {
3503         struct cifs_writedata *wdata = mid->callback_data;
3504         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3505         struct TCP_Server_Info *server = tcon->ses->server;
3506         unsigned int written;
3507         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3508         struct cifs_credits credits = { .value = 0, .instance = 0 };
3509
3510         switch (mid->mid_state) {
3511         case MID_RESPONSE_RECEIVED:
3512                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3513                 credits.instance = server->reconnect_instance;
3514                 wdata->result = smb2_check_receive(mid, server, 0);
3515                 if (wdata->result != 0)
3516                         break;
3517
3518                 written = le32_to_cpu(rsp->DataLength);
3519                 /*
3520                  * Mask off high 16 bits when bytes written as returned
3521                  * by the server is greater than bytes requested by the
3522                  * client. OS/2 servers are known to set incorrect
3523                  * CountHigh values.
3524                  */
3525                 if (written > wdata->bytes)
3526                         written &= 0xFFFF;
3527
3528                 if (written < wdata->bytes)
3529                         wdata->result = -ENOSPC;
3530                 else
3531                         wdata->bytes = written;
3532                 break;
3533         case MID_REQUEST_SUBMITTED:
3534         case MID_RETRY_NEEDED:
3535                 wdata->result = -EAGAIN;
3536                 break;
3537         case MID_RESPONSE_MALFORMED:
3538                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3539                 credits.instance = server->reconnect_instance;
3540                 /* fall through */
3541         default:
3542                 wdata->result = -EIO;
3543                 break;
3544         }
3545 #ifdef CONFIG_CIFS_SMB_DIRECT
3546         /*
3547          * If this wdata has a memory registered, the MR can be freed
3548          * The number of MRs available is limited, it's important to recover
3549          * used MR as soon as I/O is finished. Hold MR longer in the later
3550          * I/O process can possibly result in I/O deadlock due to lack of MR
3551          * to send request on I/O retry
3552          */
3553         if (wdata->mr) {
3554                 smbd_deregister_mr(wdata->mr);
3555                 wdata->mr = NULL;
3556         }
3557 #endif
3558         if (wdata->result) {
3559                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3560                 trace_smb3_write_err(0 /* no xid */,
3561                                      wdata->cfile->fid.persistent_fid,
3562                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3563                                      wdata->bytes, wdata->result);
3564         } else
3565                 trace_smb3_write_done(0 /* no xid */,
3566                                       wdata->cfile->fid.persistent_fid,
3567                                       tcon->tid, tcon->ses->Suid,
3568                                       wdata->offset, wdata->bytes);
3569
3570         queue_work(cifsiod_wq, &wdata->work);
3571         DeleteMidQEntry(mid);
3572         add_credits(server, &credits, 0);
3573 }
3574
3575 /* smb2_async_writev - send an async write, and set up mid to handle result */
3576 int
3577 smb2_async_writev(struct cifs_writedata *wdata,
3578                   void (*release)(struct kref *kref))
3579 {
3580         int rc = -EACCES, flags = 0;
3581         struct smb2_write_req *req = NULL;
3582         struct smb2_sync_hdr *shdr;
3583         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3584         struct TCP_Server_Info *server = tcon->ses->server;
3585         struct kvec iov[1];
3586         struct smb_rqst rqst = { };
3587         unsigned int total_len;
3588
3589         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3590         if (rc)
3591                 return rc;
3592
3593         if (smb3_encryption_required(tcon))
3594                 flags |= CIFS_TRANSFORM_REQ;
3595
3596         shdr = (struct smb2_sync_hdr *)req;
3597         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3598
3599         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3600         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3601         req->WriteChannelInfoOffset = 0;
3602         req->WriteChannelInfoLength = 0;
3603         req->Channel = 0;
3604         req->Offset = cpu_to_le64(wdata->offset);
3605         req->DataOffset = cpu_to_le16(
3606                                 offsetof(struct smb2_write_req, Buffer));
3607         req->RemainingBytes = 0;
3608
3609         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
3610                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
3611 #ifdef CONFIG_CIFS_SMB_DIRECT
3612         /*
3613          * If we want to do a server RDMA read, fill in and append
3614          * smbd_buffer_descriptor_v1 to the end of write request
3615          */
3616         if (server->rdma && !server->sign && wdata->bytes >=
3617                 server->smbd_conn->rdma_readwrite_threshold) {
3618
3619                 struct smbd_buffer_descriptor_v1 *v1;
3620                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3621
3622                 wdata->mr = smbd_register_mr(
3623                                 server->smbd_conn, wdata->pages,
3624                                 wdata->nr_pages, wdata->page_offset,
3625                                 wdata->tailsz, false, need_invalidate);
3626                 if (!wdata->mr) {
3627                         rc = -ENOBUFS;
3628                         goto async_writev_out;
3629                 }
3630                 req->Length = 0;
3631                 req->DataOffset = 0;
3632                 if (wdata->nr_pages > 1)
3633                         req->RemainingBytes =
3634                                 cpu_to_le32(
3635                                         (wdata->nr_pages - 1) * wdata->pagesz -
3636                                         wdata->page_offset + wdata->tailsz
3637                                 );
3638                 else
3639                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3640                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3641                 if (need_invalidate)
3642                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3643                 req->WriteChannelInfoOffset =
3644                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3645                 req->WriteChannelInfoLength =
3646                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3647                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3648                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3649                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3650                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3651         }
3652 #endif
3653         iov[0].iov_len = total_len - 1;
3654         iov[0].iov_base = (char *)req;
3655
3656         rqst.rq_iov = iov;
3657         rqst.rq_nvec = 1;
3658         rqst.rq_pages = wdata->pages;
3659         rqst.rq_offset = wdata->page_offset;
3660         rqst.rq_npages = wdata->nr_pages;
3661         rqst.rq_pagesz = wdata->pagesz;
3662         rqst.rq_tailsz = wdata->tailsz;
3663 #ifdef CONFIG_CIFS_SMB_DIRECT
3664         if (wdata->mr) {
3665                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3666                 rqst.rq_npages = 0;
3667         }
3668 #endif
3669         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3670                  wdata->offset, wdata->bytes);
3671
3672 #ifdef CONFIG_CIFS_SMB_DIRECT
3673         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3674         if (!wdata->mr)
3675                 req->Length = cpu_to_le32(wdata->bytes);
3676 #else
3677         req->Length = cpu_to_le32(wdata->bytes);
3678 #endif
3679
3680         if (wdata->credits.value > 0) {
3681                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3682                                                     SMB2_MAX_BUFFER_SIZE));
3683                 shdr->CreditRequest =
3684                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3685
3686                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
3687                 if (rc)
3688                         goto async_writev_out;
3689
3690                 flags |= CIFS_HAS_CREDITS;
3691         }
3692
3693         kref_get(&wdata->refcount);
3694         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3695                              wdata, flags, &wdata->credits);
3696
3697         if (rc) {
3698                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
3699                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3700                                      wdata->bytes, rc);
3701                 kref_put(&wdata->refcount, release);
3702                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3703         }
3704
3705 async_writev_out:
3706         cifs_small_buf_release(req);
3707         return rc;
3708 }
3709
3710 /*
3711  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
3712  * The length field from io_parms must be at least 1 and indicates a number of
3713  * elements with data to write that begins with position 1 in iov array. All
3714  * data length is specified by count.
3715  */
3716 int
3717 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
3718            unsigned int *nbytes, struct kvec *iov, int n_vec)
3719 {
3720         struct smb_rqst rqst;
3721         int rc = 0;
3722         struct smb2_write_req *req = NULL;
3723         struct smb2_write_rsp *rsp = NULL;
3724         int resp_buftype;
3725         struct kvec rsp_iov;
3726         int flags = 0;
3727         unsigned int total_len;
3728
3729         *nbytes = 0;
3730
3731         if (n_vec < 1)
3732                 return rc;
3733
3734         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
3735                              &total_len);
3736         if (rc)
3737                 return rc;
3738
3739         if (io_parms->tcon->ses->server == NULL)
3740                 return -ECONNABORTED;
3741
3742         if (smb3_encryption_required(io_parms->tcon))
3743                 flags |= CIFS_TRANSFORM_REQ;
3744
3745         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3746
3747         req->PersistentFileId = io_parms->persistent_fid;
3748         req->VolatileFileId = io_parms->volatile_fid;
3749         req->WriteChannelInfoOffset = 0;
3750         req->WriteChannelInfoLength = 0;
3751         req->Channel = 0;
3752         req->Length = cpu_to_le32(io_parms->length);
3753         req->Offset = cpu_to_le64(io_parms->offset);
3754         req->DataOffset = cpu_to_le16(
3755                                 offsetof(struct smb2_write_req, Buffer));
3756         req->RemainingBytes = 0;
3757
3758         trace_smb3_write_enter(xid, io_parms->persistent_fid,
3759                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3760                 io_parms->offset, io_parms->length);
3761
3762         iov[0].iov_base = (char *)req;
3763         /* 1 for Buffer */
3764         iov[0].iov_len = total_len - 1;
3765
3766         memset(&rqst, 0, sizeof(struct smb_rqst));
3767         rqst.rq_iov = iov;
3768         rqst.rq_nvec = n_vec + 1;
3769
3770         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
3771                             &resp_buftype, flags, &rsp_iov);
3772         cifs_small_buf_release(req);
3773         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3774
3775         if (rc) {
3776                 trace_smb3_write_err(xid, req->PersistentFileId,
3777                                      io_parms->tcon->tid,
3778                                      io_parms->tcon->ses->Suid,
3779                                      io_parms->offset, io_parms->length, rc);
3780                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3781                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
3782         } else {
3783                 *nbytes = le32_to_cpu(rsp->DataLength);
3784                 trace_smb3_write_done(xid, req->PersistentFileId,
3785                                      io_parms->tcon->tid,
3786                                      io_parms->tcon->ses->Suid,
3787                                      io_parms->offset, *nbytes);
3788         }
3789
3790         free_rsp_buf(resp_buftype, rsp);
3791         return rc;
3792 }
3793
3794 static unsigned int
3795 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
3796 {
3797         int len;
3798         unsigned int entrycount = 0;
3799         unsigned int next_offset = 0;
3800         char *entryptr;
3801         FILE_DIRECTORY_INFO *dir_info;
3802
3803         if (bufstart == NULL)
3804                 return 0;
3805
3806         entryptr = bufstart;
3807
3808         while (1) {
3809                 if (entryptr + next_offset < entryptr ||
3810                     entryptr + next_offset > end_of_buf ||
3811                     entryptr + next_offset + size > end_of_buf) {
3812                         cifs_dbg(VFS, "malformed search entry would overflow\n");
3813                         break;
3814                 }
3815
3816                 entryptr = entryptr + next_offset;
3817                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
3818
3819                 len = le32_to_cpu(dir_info->FileNameLength);
3820                 if (entryptr + len < entryptr ||
3821                     entryptr + len > end_of_buf ||
3822                     entryptr + len + size > end_of_buf) {
3823                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
3824                                  end_of_buf);
3825                         break;
3826                 }
3827
3828                 *lastentry = entryptr;
3829                 entrycount++;
3830
3831                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
3832                 if (!next_offset)
3833                         break;
3834         }
3835
3836         return entrycount;
3837 }
3838
3839 /*
3840  * Readdir/FindFirst
3841  */
3842 int
3843 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
3844                      u64 persistent_fid, u64 volatile_fid, int index,
3845                      struct cifs_search_info *srch_inf)
3846 {
3847         struct smb_rqst rqst;
3848         struct smb2_query_directory_req *req;
3849         struct smb2_query_directory_rsp *rsp = NULL;
3850         struct kvec iov[2];
3851         struct kvec rsp_iov;
3852         int rc = 0;
3853         int len;
3854         int resp_buftype = CIFS_NO_BUFFER;
3855         unsigned char *bufptr;
3856         struct TCP_Server_Info *server;
3857         struct cifs_ses *ses = tcon->ses;
3858         __le16 asteriks = cpu_to_le16('*');
3859         char *end_of_smb;
3860         unsigned int output_size = CIFSMaxBufSize;
3861         size_t info_buf_size;
3862         int flags = 0;
3863         unsigned int total_len;
3864
3865         if (ses && (ses->server))
3866                 server = ses->server;
3867         else
3868                 return -EIO;
3869
3870         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
3871                              &total_len);
3872         if (rc)
3873                 return rc;
3874
3875         if (smb3_encryption_required(tcon))
3876                 flags |= CIFS_TRANSFORM_REQ;
3877
3878         switch (srch_inf->info_level) {
3879         case SMB_FIND_FILE_DIRECTORY_INFO:
3880                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3881                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3882                 break;
3883         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3884                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3885                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3886                 break;
3887         default:
3888                 cifs_dbg(VFS, "info level %u isn't supported\n",
3889                          srch_inf->info_level);
3890                 rc = -EINVAL;
3891                 goto qdir_exit;
3892         }
3893
3894         req->FileIndex = cpu_to_le32(index);
3895         req->PersistentFileId = persistent_fid;
3896         req->VolatileFileId = volatile_fid;
3897
3898         len = 0x2;
3899         bufptr = req->Buffer;
3900         memcpy(bufptr, &asteriks, len);
3901
3902         req->FileNameOffset =
3903                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3904         req->FileNameLength = cpu_to_le16(len);
3905         /*
3906          * BB could be 30 bytes or so longer if we used SMB2 specific
3907          * buffer lengths, but this is safe and close enough.
3908          */
3909         output_size = min_t(unsigned int, output_size, server->maxBuf);
3910         output_size = min_t(unsigned int, output_size, 2 << 15);
3911         req->OutputBufferLength = cpu_to_le32(output_size);
3912
3913         iov[0].iov_base = (char *)req;
3914         /* 1 for Buffer */
3915         iov[0].iov_len = total_len - 1;
3916
3917         iov[1].iov_base = (char *)(req->Buffer);
3918         iov[1].iov_len = len;
3919
3920         memset(&rqst, 0, sizeof(struct smb_rqst));
3921         rqst.rq_iov = iov;
3922         rqst.rq_nvec = 2;
3923
3924         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
3925                         tcon->ses->Suid, index, output_size);
3926
3927         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3928         cifs_small_buf_release(req);
3929         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3930
3931         if (rc) {
3932                 if (rc == -ENODATA &&
3933                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
3934                         trace_smb3_query_dir_done(xid, persistent_fid,
3935                                 tcon->tid, tcon->ses->Suid, index, 0);
3936                         srch_inf->endOfSearch = true;
3937                         rc = 0;
3938                 } else {
3939                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
3940                                 tcon->ses->Suid, index, 0, rc);
3941                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
3942                 }
3943                 goto qdir_exit;
3944         }
3945
3946         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
3947                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
3948                                info_buf_size);
3949         if (rc) {
3950                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
3951                         tcon->ses->Suid, index, 0, rc);
3952                 goto qdir_exit;
3953         }
3954
3955         srch_inf->unicode = true;
3956
3957         if (srch_inf->ntwrk_buf_start) {
3958                 if (srch_inf->smallBuf)
3959                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
3960                 else
3961                         cifs_buf_release(srch_inf->ntwrk_buf_start);
3962         }
3963         srch_inf->ntwrk_buf_start = (char *)rsp;
3964         srch_inf->srch_entries_start = srch_inf->last_entry =
3965                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
3966         end_of_smb = rsp_iov.iov_len + (char *)rsp;
3967         srch_inf->entries_in_buffer =
3968                         num_entries(srch_inf->srch_entries_start, end_of_smb,
3969                                     &srch_inf->last_entry, info_buf_size);
3970         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
3971         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
3972                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
3973                  srch_inf->srch_entries_start, srch_inf->last_entry);
3974         if (resp_buftype == CIFS_LARGE_BUFFER)
3975                 srch_inf->smallBuf = false;
3976         else if (resp_buftype == CIFS_SMALL_BUFFER)
3977                 srch_inf->smallBuf = true;
3978         else
3979                 cifs_dbg(VFS, "illegal search buffer type\n");
3980
3981         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
3982                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
3983         return rc;
3984
3985 qdir_exit:
3986         free_rsp_buf(resp_buftype, rsp);
3987         return rc;
3988 }
3989
3990 int
3991 SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
3992                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3993                u8 info_type, u32 additional_info,
3994                 void **data, unsigned int *size)
3995 {
3996         struct smb2_set_info_req *req;
3997         struct kvec *iov = rqst->rq_iov;
3998         unsigned int i, total_len;
3999         int rc;
4000
4001         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
4002         if (rc)
4003                 return rc;
4004
4005         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4006         req->InfoType = info_type;
4007         req->FileInfoClass = info_class;
4008         req->PersistentFileId = persistent_fid;
4009         req->VolatileFileId = volatile_fid;
4010         req->AdditionalInformation = cpu_to_le32(additional_info);
4011
4012         req->BufferOffset =
4013                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4014         req->BufferLength = cpu_to_le32(*size);
4015
4016         memcpy(req->Buffer, *data, *size);
4017         total_len += *size;
4018
4019         iov[0].iov_base = (char *)req;
4020         /* 1 for Buffer */
4021         iov[0].iov_len = total_len - 1;
4022
4023         for (i = 1; i < rqst->rq_nvec; i++) {
4024                 le32_add_cpu(&req->BufferLength, size[i]);
4025                 iov[i].iov_base = (char *)data[i];
4026                 iov[i].iov_len = size[i];
4027         }
4028
4029         return 0;
4030 }
4031
4032 void
4033 SMB2_set_info_free(struct smb_rqst *rqst)
4034 {
4035         if (rqst && rqst->rq_iov)
4036                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4037 }
4038
4039 static int
4040 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4041                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4042                u8 info_type, u32 additional_info, unsigned int num,
4043                 void **data, unsigned int *size)
4044 {
4045         struct smb_rqst rqst;
4046         struct smb2_set_info_rsp *rsp = NULL;
4047         struct kvec *iov;
4048         struct kvec rsp_iov;
4049         int rc = 0;
4050         int resp_buftype;
4051         struct cifs_ses *ses = tcon->ses;
4052         int flags = 0;
4053
4054         if (!ses || !(ses->server))
4055                 return -EIO;
4056
4057         if (!num)
4058                 return -EINVAL;
4059
4060         if (smb3_encryption_required(tcon))
4061                 flags |= CIFS_TRANSFORM_REQ;
4062
4063         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4064         if (!iov)
4065                 return -ENOMEM;
4066
4067         memset(&rqst, 0, sizeof(struct smb_rqst));
4068         rqst.rq_iov = iov;
4069         rqst.rq_nvec = num;
4070
4071         rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid,
4072                                 info_class, info_type, additional_info,
4073                                 data, size);
4074         if (rc) {
4075                 kfree(iov);
4076                 return rc;
4077         }
4078
4079
4080         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
4081                             &rsp_iov);
4082         SMB2_set_info_free(&rqst);
4083         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4084
4085         if (rc != 0) {
4086                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4087                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4088                                 ses->Suid, info_class, (__u32)info_type, rc);
4089         }
4090
4091         free_rsp_buf(resp_buftype, rsp);
4092         kfree(iov);
4093         return rc;
4094 }
4095
4096 int
4097 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4098              u64 volatile_fid, u32 pid, __le64 *eof)
4099 {
4100         struct smb2_file_eof_info info;
4101         void *data;
4102         unsigned int size;
4103
4104         info.EndOfFile = *eof;
4105
4106         data = &info;
4107         size = sizeof(struct smb2_file_eof_info);
4108
4109         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4110                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4111                         0, 1, &data, &size);
4112 }
4113
4114 int
4115 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4116                 u64 persistent_fid, u64 volatile_fid,
4117                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4118 {
4119         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4120                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4121                         1, (void **)&pnntsd, &pacllen);
4122 }
4123
4124 int
4125 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4126             u64 persistent_fid, u64 volatile_fid,
4127             struct smb2_file_full_ea_info *buf, int len)
4128 {
4129         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4130                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4131                 0, 1, (void **)&buf, &len);
4132 }
4133
4134 int
4135 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4136                   const u64 persistent_fid, const u64 volatile_fid,
4137                   __u8 oplock_level)
4138 {
4139         struct smb_rqst rqst;
4140         int rc;
4141         struct smb2_oplock_break *req = NULL;
4142         struct cifs_ses *ses = tcon->ses;
4143         int flags = CIFS_OBREAK_OP;
4144         unsigned int total_len;
4145         struct kvec iov[1];
4146         struct kvec rsp_iov;
4147         int resp_buf_type;
4148
4149         cifs_dbg(FYI, "SMB2_oplock_break\n");
4150         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4151                              &total_len);
4152         if (rc)
4153                 return rc;
4154
4155         if (smb3_encryption_required(tcon))
4156                 flags |= CIFS_TRANSFORM_REQ;
4157
4158         req->VolatileFid = volatile_fid;
4159         req->PersistentFid = persistent_fid;
4160         req->OplockLevel = oplock_level;
4161         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4162
4163         flags |= CIFS_NO_RESP;
4164
4165         iov[0].iov_base = (char *)req;
4166         iov[0].iov_len = total_len;
4167
4168         memset(&rqst, 0, sizeof(struct smb_rqst));
4169         rqst.rq_iov = iov;
4170         rqst.rq_nvec = 1;
4171
4172         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4173         cifs_small_buf_release(req);
4174
4175         if (rc) {
4176                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4177                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
4178         }
4179
4180         return rc;
4181 }
4182
4183 void
4184 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
4185                              struct kstatfs *kst)
4186 {
4187         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
4188                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
4189         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
4190         kst->f_bfree  = kst->f_bavail =
4191                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
4192         return;
4193 }
4194
4195 static void
4196 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
4197                         struct kstatfs *kst)
4198 {
4199         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
4200         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
4201         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
4202         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
4203                 kst->f_bavail = kst->f_bfree;
4204         else
4205                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
4206         if (response_data->TotalFileNodes != cpu_to_le64(-1))
4207                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
4208         if (response_data->FreeFileNodes != cpu_to_le64(-1))
4209                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
4210
4211         return;
4212 }
4213
4214 static int
4215 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
4216                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
4217 {
4218         int rc;
4219         struct smb2_query_info_req *req;
4220         unsigned int total_len;
4221
4222         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
4223
4224         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
4225                 return -EIO;
4226
4227         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
4228                              &total_len);
4229         if (rc)
4230                 return rc;
4231
4232         req->InfoType = SMB2_O_INFO_FILESYSTEM;
4233         req->FileInfoClass = level;
4234         req->PersistentFileId = persistent_fid;
4235         req->VolatileFileId = volatile_fid;
4236         /* 1 for pad */
4237         req->InputBufferOffset =
4238                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4239         req->OutputBufferLength = cpu_to_le32(
4240                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4241
4242         iov->iov_base = (char *)req;
4243         iov->iov_len = total_len;
4244         return 0;
4245 }
4246
4247 int
4248 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4249               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4250 {
4251         struct smb_rqst rqst;
4252         struct smb2_query_info_rsp *rsp = NULL;
4253         struct kvec iov;
4254         struct kvec rsp_iov;
4255         int rc = 0;
4256         int resp_buftype;
4257         struct cifs_ses *ses = tcon->ses;
4258         FILE_SYSTEM_POSIX_INFO *info = NULL;
4259         int flags = 0;
4260
4261         rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4262                                 sizeof(FILE_SYSTEM_POSIX_INFO),
4263                                 persistent_fid, volatile_fid);
4264         if (rc)
4265                 return rc;
4266
4267         if (smb3_encryption_required(tcon))
4268                 flags |= CIFS_TRANSFORM_REQ;
4269
4270         memset(&rqst, 0, sizeof(struct smb_rqst));
4271         rqst.rq_iov = &iov;
4272         rqst.rq_nvec = 1;
4273
4274         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4275         cifs_small_buf_release(iov.iov_base);
4276         if (rc) {
4277                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4278                 goto posix_qfsinf_exit;
4279         }
4280         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4281
4282         info = (FILE_SYSTEM_POSIX_INFO *)(
4283                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4284         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4285                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4286                                sizeof(FILE_SYSTEM_POSIX_INFO));
4287         if (!rc)
4288                 copy_posix_fs_info_to_kstatfs(info, fsdata);
4289
4290 posix_qfsinf_exit:
4291         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4292         return rc;
4293 }
4294
4295 int
4296 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
4297               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4298 {
4299         struct smb_rqst rqst;
4300         struct smb2_query_info_rsp *rsp = NULL;
4301         struct kvec iov;
4302         struct kvec rsp_iov;
4303         int rc = 0;
4304         int resp_buftype;
4305         struct cifs_ses *ses = tcon->ses;
4306         struct smb2_fs_full_size_info *info = NULL;
4307         int flags = 0;
4308
4309         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
4310                                 sizeof(struct smb2_fs_full_size_info),
4311                                 persistent_fid, volatile_fid);
4312         if (rc)
4313                 return rc;
4314
4315         if (smb3_encryption_required(tcon))
4316                 flags |= CIFS_TRANSFORM_REQ;
4317
4318         memset(&rqst, 0, sizeof(struct smb_rqst));
4319         rqst.rq_iov = &iov;
4320         rqst.rq_nvec = 1;
4321
4322         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4323         cifs_small_buf_release(iov.iov_base);
4324         if (rc) {
4325                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4326                 goto qfsinf_exit;
4327         }
4328         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4329
4330         info = (struct smb2_fs_full_size_info *)(
4331                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4332         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4333                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4334                                sizeof(struct smb2_fs_full_size_info));
4335         if (!rc)
4336                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
4337
4338 qfsinf_exit:
4339         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4340         return rc;
4341 }
4342
4343 int
4344 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4345               u64 persistent_fid, u64 volatile_fid, int level)
4346 {
4347         struct smb_rqst rqst;
4348         struct smb2_query_info_rsp *rsp = NULL;
4349         struct kvec iov;
4350         struct kvec rsp_iov;
4351         int rc = 0;
4352         int resp_buftype, max_len, min_len;
4353         struct cifs_ses *ses = tcon->ses;
4354         unsigned int rsp_len, offset;
4355         int flags = 0;
4356
4357         if (level == FS_DEVICE_INFORMATION) {
4358                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4359                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4360         } else if (level == FS_ATTRIBUTE_INFORMATION) {
4361                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4362                 min_len = MIN_FS_ATTR_INFO_SIZE;
4363         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4364                 max_len = sizeof(struct smb3_fs_ss_info);
4365                 min_len = sizeof(struct smb3_fs_ss_info);
4366         } else if (level == FS_VOLUME_INFORMATION) {
4367                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
4368                 min_len = sizeof(struct smb3_fs_vol_info);
4369         } else {
4370                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4371                 return -EINVAL;
4372         }
4373
4374         rc = build_qfs_info_req(&iov, tcon, level, max_len,
4375                                 persistent_fid, volatile_fid);
4376         if (rc)
4377                 return rc;
4378
4379         if (smb3_encryption_required(tcon))
4380                 flags |= CIFS_TRANSFORM_REQ;
4381
4382         memset(&rqst, 0, sizeof(struct smb_rqst));
4383         rqst.rq_iov = &iov;
4384         rqst.rq_nvec = 1;
4385
4386         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4387         cifs_small_buf_release(iov.iov_base);
4388         if (rc) {
4389                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4390                 goto qfsattr_exit;
4391         }
4392         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4393
4394         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4395         offset = le16_to_cpu(rsp->OutputBufferOffset);
4396         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
4397         if (rc)
4398                 goto qfsattr_exit;
4399
4400         if (level == FS_ATTRIBUTE_INFORMATION)
4401                 memcpy(&tcon->fsAttrInfo, offset
4402                         + (char *)rsp, min_t(unsigned int,
4403                         rsp_len, max_len));
4404         else if (level == FS_DEVICE_INFORMATION)
4405                 memcpy(&tcon->fsDevInfo, offset
4406                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4407         else if (level == FS_SECTOR_SIZE_INFORMATION) {
4408                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4409                         (offset + (char *)rsp);
4410                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4411                 tcon->perf_sector_size =
4412                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4413         } else if (level == FS_VOLUME_INFORMATION) {
4414                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
4415                         (offset + (char *)rsp);
4416                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
4417                 tcon->vol_create_time = vol_info->VolumeCreationTime;
4418         }
4419
4420 qfsattr_exit:
4421         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4422         return rc;
4423 }
4424
4425 int
4426 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4427            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4428            const __u32 num_lock, struct smb2_lock_element *buf)
4429 {
4430         struct smb_rqst rqst;
4431         int rc = 0;
4432         struct smb2_lock_req *req = NULL;
4433         struct kvec iov[2];
4434         struct kvec rsp_iov;
4435         int resp_buf_type;
4436         unsigned int count;
4437         int flags = CIFS_NO_RESP;
4438         unsigned int total_len;
4439
4440         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4441
4442         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4443         if (rc)
4444                 return rc;
4445
4446         if (smb3_encryption_required(tcon))
4447                 flags |= CIFS_TRANSFORM_REQ;
4448
4449         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4450         req->LockCount = cpu_to_le16(num_lock);
4451
4452         req->PersistentFileId = persist_fid;
4453         req->VolatileFileId = volatile_fid;
4454
4455         count = num_lock * sizeof(struct smb2_lock_element);
4456
4457         iov[0].iov_base = (char *)req;
4458         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4459         iov[1].iov_base = (char *)buf;
4460         iov[1].iov_len = count;
4461
4462         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4463
4464         memset(&rqst, 0, sizeof(struct smb_rqst));
4465         rqst.rq_iov = iov;
4466         rqst.rq_nvec = 2;
4467
4468         rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4469                             &rsp_iov);
4470         cifs_small_buf_release(req);
4471         if (rc) {
4472                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4473                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4474                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4475                                     tcon->ses->Suid, rc);
4476         }
4477
4478         return rc;
4479 }
4480
4481 int
4482 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
4483           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4484           const __u64 length, const __u64 offset, const __u32 lock_flags,
4485           const bool wait)
4486 {
4487         struct smb2_lock_element lock;
4488
4489         lock.Offset = cpu_to_le64(offset);
4490         lock.Length = cpu_to_le64(length);
4491         lock.Flags = cpu_to_le32(lock_flags);
4492         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
4493                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
4494
4495         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
4496 }
4497
4498 int
4499 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
4500                  __u8 *lease_key, const __le32 lease_state)
4501 {
4502         struct smb_rqst rqst;
4503         int rc;
4504         struct smb2_lease_ack *req = NULL;
4505         struct cifs_ses *ses = tcon->ses;
4506         int flags = CIFS_OBREAK_OP;
4507         unsigned int total_len;
4508         struct kvec iov[1];
4509         struct kvec rsp_iov;
4510         int resp_buf_type;
4511         __u64 *please_key_high;
4512         __u64 *please_key_low;
4513
4514         cifs_dbg(FYI, "SMB2_lease_break\n");
4515         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4516                              &total_len);
4517         if (rc)
4518                 return rc;
4519
4520         if (smb3_encryption_required(tcon))
4521                 flags |= CIFS_TRANSFORM_REQ;
4522
4523         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4524         req->StructureSize = cpu_to_le16(36);
4525         total_len += 12;
4526
4527         memcpy(req->LeaseKey, lease_key, 16);
4528         req->LeaseState = lease_state;
4529
4530         flags |= CIFS_NO_RESP;
4531
4532         iov[0].iov_base = (char *)req;
4533         iov[0].iov_len = total_len;
4534
4535         memset(&rqst, 0, sizeof(struct smb_rqst));
4536         rqst.rq_iov = iov;
4537         rqst.rq_nvec = 1;
4538
4539         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4540         cifs_small_buf_release(req);
4541
4542         please_key_low = (__u64 *)lease_key;
4543         please_key_high = (__u64 *)(lease_key+8);
4544         if (rc) {
4545                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4546                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
4547                         ses->Suid, *please_key_low, *please_key_high, rc);
4548                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
4549         } else
4550                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
4551                         ses->Suid, *please_key_low, *please_key_high);
4552
4553         return rc;
4554 }