fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/uuid.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/xattr.h>
  39 #include "smb2pdu.h"
  40 #include "cifsglob.h"
  41 #include "cifsacl.h"
  42 #include "cifsproto.h"
  43 #include "smb2proto.h"
  44 #include "cifs_unicode.h"
  45 #include "cifs_debug.h"
  46 #include "ntlmssp.h"
  47 #include "smb2status.h"
  48 #include "smb2glob.h"
  49 #include "cifspdu.h"
  50 #include "cifs_spnego.h"
  51 #include "smbdirect.h"
  52 #include "trace.h"
  53 #ifdef CONFIG_CIFS_DFS_UPCALL
  54 #include "dfs_cache.h"
  55 #endif
  56
  57 /*
  58  *  The following table defines the expected "StructureSize" of SMB2 requests
  59  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  60  *
  61  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  62  *  indexed by command in host byte order.
  63  */
  64 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  65         /* SMB2_NEGOTIATE */ 36,
  66         /* SMB2_SESSION_SETUP */ 25,
  67         /* SMB2_LOGOFF */ 4,
  68         /* SMB2_TREE_CONNECT */ 9,
  69         /* SMB2_TREE_DISCONNECT */ 4,
  70         /* SMB2_CREATE */ 57,
  71         /* SMB2_CLOSE */ 24,
  72         /* SMB2_FLUSH */ 24,
  73         /* SMB2_READ */ 49,
  74         /* SMB2_WRITE */ 49,
  75         /* SMB2_LOCK */ 48,
  76         /* SMB2_IOCTL */ 57,
  77         /* SMB2_CANCEL */ 4,
  78         /* SMB2_ECHO */ 4,
  79         /* SMB2_QUERY_DIRECTORY */ 33,
  80         /* SMB2_CHANGE_NOTIFY */ 32,
  81         /* SMB2_QUERY_INFO */ 41,
  82         /* SMB2_SET_INFO */ 33,
  83         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  84 };
  85
  86 int smb3_encryption_required(const struct cifs_tcon *tcon)
  87 {
  88         if (!tcon)
  89                 return 0;
  90         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  91             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  92                 return 1;
  93         if (tcon->seal &&
  94             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  95                 return 1;
  96         return 0;
  97 }
  98
  99 static void
 100 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
 101                   const struct cifs_tcon *tcon)
 102 {
 103         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 104         shdr->StructureSize = cpu_to_le16(64);
 105         shdr->Command = smb2_cmd;
 106         if (tcon && tcon->ses && tcon->ses->server) {
 107                 struct TCP_Server_Info *server = tcon->ses->server;
 108
 109                 spin_lock(&server->req_lock);
 110                 /* Request up to 10 credits but don't go over the limit. */
 111                 if (server->credits >= server->max_credits)
 112                         shdr->CreditRequest = cpu_to_le16(0);
 113                 else
 114                         shdr->CreditRequest = cpu_to_le16(
 115                                 min_t(int, server->max_credits -
 116                                                 server->credits, 10));
 117                 spin_unlock(&server->req_lock);
 118         } else {
 119                 shdr->CreditRequest = cpu_to_le16(2);
 120         }
 121         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 122
 123         if (!tcon)
 124                 goto out;
 125
 126         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 127         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 128         if ((tcon->ses) && (tcon->ses->server) &&
 129             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 130                 shdr->CreditCharge = cpu_to_le16(1);
 131         /* else CreditCharge MBZ */
 132
 133         shdr->TreeId = tcon->tid;
 134         /* Uid is not converted */
 135         if (tcon->ses)
 136                 shdr->SessionId = tcon->ses->Suid;
 137
 138         /*
 139          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 140          * to pass the path on the Open SMB prefixed by \\server\share.
 141          * Not sure when we would need to do the augmented path (if ever) and
 142          * setting this flag breaks the SMB2 open operation since it is
 143          * illegal to send an empty path name (without \\server\share prefix)
 144          * when the DFS flag is set in the SMB open header. We could
 145          * consider setting the flag on all operations other than open
 146          * but it is safer to net set it for now.
 147          */
 148 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 149                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 150
 151         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
 152             !smb3_encryption_required(tcon))
 153                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 154 out:
 155         return;
 156 }
 157
 158 #ifdef CONFIG_CIFS_DFS_UPCALL
 159 static int __smb2_reconnect(const struct nls_table *nlsc,
 160                             struct cifs_tcon *tcon)
 161 {
 162         int rc;
 163         struct dfs_cache_tgt_list tl;
 164         struct dfs_cache_tgt_iterator *it = NULL;
 165         char *tree;
 166         const char *tcp_host;
 167         size_t tcp_host_len;
 168         const char *dfs_host;
 169         size_t dfs_host_len;
 170
 171         tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL);
 172         if (!tree)
 173                 return -ENOMEM;
 174
 175         if (tcon->ipc) {
 176                 scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$",
 177                           tcon->ses->server->hostname);
 178                 rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
 179                 goto out;
 180         }
 181
 182         if (!tcon->dfs_path) {
 183                 rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
 184                 goto out;
 185         }
 186
 187         rc = dfs_cache_noreq_find(tcon->dfs_path + 1, NULL, &tl);
 188         if (rc)
 189                 goto out;
 190
 191         extract_unc_hostname(tcon->ses->server->hostname, &tcp_host,
 192                              &tcp_host_len);
 193
 194         for (it = dfs_cache_get_tgt_iterator(&tl); it;
 195              it = dfs_cache_get_next_tgt(&tl, it)) {
 196                 const char *tgt = dfs_cache_get_tgt_name(it);
 197
 198                 extract_unc_hostname(tgt, &dfs_host, &dfs_host_len);
 199
 200                 if (dfs_host_len != tcp_host_len
 201                     || strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) {
 202                         cifs_dbg(FYI, "%s: skipping %.*s, doesn't match %.*s",
 203                                  __func__,
 204                                  (int)dfs_host_len, dfs_host,
 205                                  (int)tcp_host_len, tcp_host);
 206                         continue;
 207                 }
 208
 209                 scnprintf(tree, MAX_TREE_SIZE, "\\%s", tgt);
 210
 211                 rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
 212                 if (!rc)
 213                         break;
 214                 if (rc == -EREMOTE)
 215                         break;
 216         }
 217
 218         if (!rc) {
 219                 if (it)
 220                         rc = dfs_cache_noreq_update_tgthint(tcon->dfs_path + 1,
 221                                                             it);
 222                 else
 223                         rc = -ENOENT;
 224         }
 225         dfs_cache_free_tgts(&tl);
 226 out:
 227         kfree(tree);
 228         return rc;
 229 }
 230 #else
 231 static inline int __smb2_reconnect(const struct nls_table *nlsc,
 232                                    struct cifs_tcon *tcon)
 233 {
 234         return SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
 235 }
 236 #endif
 237
 238 static int
 239 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 240 {
 241         int rc;
 242         struct nls_table *nls_codepage;
 243         struct cifs_ses *ses;
 244         struct TCP_Server_Info *server;
 245         int retries;
 246
 247         /*
 248          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 249          * check for tcp and smb session status done differently
 250          * for those three - in the calling routine.
 251          */
 252         if (tcon == NULL)
 253                 return 0;
 254
 255         if (smb2_command == SMB2_TREE_CONNECT || smb2_command == SMB2_IOCTL)
 256                 return 0;
 257
 258         if (tcon->tidStatus == CifsExiting) {
 259                 /*
 260                  * only tree disconnect, open, and write,
 261                  * (and ulogoff which does not have tcon)
 262                  * are allowed as we start force umount.
 263                  */
 264                 if ((smb2_command != SMB2_WRITE) &&
 265                    (smb2_command != SMB2_CREATE) &&
 266                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 267                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 268                                  smb2_command);
 269                         return -ENODEV;
 270                 }
 271         }
 272         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 273             (!tcon->ses->server))
 274                 return -EIO;
 275
 276         ses = tcon->ses;
 277         server = ses->server;
 278
 279         retries = server->nr_targets;
 280
 281         /*
 282          * Give demultiplex thread up to 10 seconds to each target available for
 283          * reconnect -- should be greater than cifs socket timeout which is 7
 284          * seconds.
 285          */
 286         while (server->tcpStatus == CifsNeedReconnect) {
 287                 /*
 288                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 289                  * here since they are implicitly done when session drops.
 290                  */
 291                 switch (smb2_command) {
 292                 /*
 293                  * BB Should we keep oplock break and add flush to exceptions?
 294                  */
 295                 case SMB2_TREE_DISCONNECT:
 296                 case SMB2_CANCEL:
 297                 case SMB2_CLOSE:
 298                 case SMB2_OPLOCK_BREAK:
 299                         return -EAGAIN;
 300                 }
 301
 302                 rc = wait_event_interruptible_timeout(server->response_q,
 303                                                       (server->tcpStatus != CifsNeedReconnect),
 304                                                       10 * HZ);
 305                 if (rc < 0) {
 306                         cifs_dbg(FYI, "%s: aborting reconnect due to a received"
 307                                  " signal by the process\n", __func__);
 308                         return -ERESTARTSYS;
 309                 }
 310
 311                 /* are we still trying to reconnect? */
 312                 if (server->tcpStatus != CifsNeedReconnect)
 313                         break;
 314
 315                 if (--retries)
 316                         continue;
 317
 318                 /*
 319                  * on "soft" mounts we wait once. Hard mounts keep
 320                  * retrying until process is killed or server comes
 321                  * back on-line
 322                  */
 323                 if (!tcon->retry) {
 324                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 325                         return -EHOSTDOWN;
 326                 }
 327                 retries = server->nr_targets;
 328         }
 329
 330         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 331                 return 0;
 332
 333         nls_codepage = load_nls_default();
 334
 335         /*
 336          * need to prevent multiple threads trying to simultaneously reconnect
 337          * the same SMB session
 338          */
 339         mutex_lock(&tcon->ses->session_mutex);
 340
 341         /*
 342          * Recheck after acquire mutex. If another thread is negotiating
 343          * and the server never sends an answer the socket will be closed
 344          * and tcpStatus set to reconnect.
 345          */
 346         if (server->tcpStatus == CifsNeedReconnect) {
 347                 rc = -EHOSTDOWN;
 348                 mutex_unlock(&tcon->ses->session_mutex);
 349                 goto out;
 350         }
 351
 352         rc = cifs_negotiate_protocol(0, tcon->ses);
 353         if (!rc && tcon->ses->need_reconnect)
 354                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 355
 356         if (rc || !tcon->need_reconnect) {
 357                 mutex_unlock(&tcon->ses->session_mutex);
 358                 goto out;
 359         }
 360
 361         cifs_mark_open_files_invalid(tcon);
 362         if (tcon->use_persistent)
 363                 tcon->need_reopen_files = true;
 364
 365         rc = __smb2_reconnect(nls_codepage, tcon);
 366         mutex_unlock(&tcon->ses->session_mutex);
 367
 368         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 369         if (rc) {
 370                 /* If sess reconnected but tcon didn't, something strange ... */
 371                 printk_once(KERN_WARNING "reconnect tcon failed rc = %d\n", rc);
 372                 goto out;
 373         }
 374
 375         if (smb2_command != SMB2_INTERNAL_CMD)
 376                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
 377
 378         atomic_inc(&tconInfoReconnectCount);
 379 out:
 380         /*
 381          * Check if handle based operation so we know whether we can continue
 382          * or not without returning to caller to reset file handle.
 383          */
 384         /*
 385          * BB Is flush done by server on drop of tcp session? Should we special
 386          * case it and skip above?
 387          */
 388         switch (smb2_command) {
 389         case SMB2_FLUSH:
 390         case SMB2_READ:
 391         case SMB2_WRITE:
 392         case SMB2_LOCK:
 393         case SMB2_IOCTL:
 394         case SMB2_QUERY_DIRECTORY:
 395         case SMB2_CHANGE_NOTIFY:
 396         case SMB2_QUERY_INFO:
 397         case SMB2_SET_INFO:
 398                 rc = -EAGAIN;
 399         }
 400         unload_nls(nls_codepage);
 401         return rc;
 402 }
 403
 404 static void
 405 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
 406                unsigned int *total_len)
 407 {
 408         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 409         /* lookup word count ie StructureSize from table */
 410         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 411
 412         /*
 413          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 414          * largest operations (Create)
 415          */
 416         memset(buf, 0, 256);
 417
 418         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
 419         spdu->StructureSize2 = cpu_to_le16(parmsize);
 420
 421         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 422 }
 423
 424 /*
 425  * Allocate and return pointer to an SMB request hdr, and set basic
 426  * SMB information in the SMB header. If the return code is zero, this
 427  * function must have filled in request_buf pointer.
 428  */
 429 static int
 430 smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 431                     void **request_buf, unsigned int *total_len)
 432 {
 433         int rc;
 434
 435         rc = smb2_reconnect(smb2_command, tcon);
 436         if (rc)
 437                 return rc;
 438
 439         /* BB eventually switch this to SMB2 specific small buf size */
 440         if (smb2_command == SMB2_SET_INFO)
 441                 *request_buf = cifs_buf_get();
 442         else
 443                 *request_buf = cifs_small_buf_get();
 444         if (*request_buf == NULL) {
 445                 /* BB should we add a retry in here if not a writepage? */
 446                 return -ENOMEM;
 447         }
 448
 449         fill_small_buf(smb2_command, tcon,
 450                        (struct smb2_sync_hdr *)(*request_buf),
 451                        total_len);
 452
 453         if (tcon != NULL) {
 454                 uint16_t com_code = le16_to_cpu(smb2_command);
 455                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 456                 cifs_stats_inc(&tcon->num_smbs_sent);
 457         }
 458
 459         return rc;
 460 }
 461
 462 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 463
 464 static void
 465 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 466 {
 467         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 468         pneg_ctxt->DataLength = cpu_to_le16(38);
 469         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 470         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 471         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 472         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 473 }
 474
 475 static void
 476 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 477 {
 478         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 479         pneg_ctxt->DataLength =
 480                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 481                           - sizeof(struct smb2_neg_context));
 482         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 483         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 484         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 485         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 486 }
 487
 488 static void
 489 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 490 {
 491         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 492         pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + two ciphers */
 493         pneg_ctxt->CipherCount = cpu_to_le16(2);
 494         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 495         pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 496 }
 497
 498 static unsigned int
 499 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 500 {
 501         struct nls_table *cp = load_nls_default();
 502
 503         pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 504
 505         /* copy up to max of first 100 bytes of server name to NetName field */
 506         pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 507         /* context size is DataLength + minimal smb2_neg_context */
 508         return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
 509                         sizeof(struct smb2_neg_context), 8) * 8;
 510 }
 511
 512 static void
 513 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 514 {
 515         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 516         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 517         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 518         pneg_ctxt->Name[0] = 0x93;
 519         pneg_ctxt->Name[1] = 0xAD;
 520         pneg_ctxt->Name[2] = 0x25;
 521         pneg_ctxt->Name[3] = 0x50;
 522         pneg_ctxt->Name[4] = 0x9C;
 523         pneg_ctxt->Name[5] = 0xB4;
 524         pneg_ctxt->Name[6] = 0x11;
 525         pneg_ctxt->Name[7] = 0xE7;
 526         pneg_ctxt->Name[8] = 0xB4;
 527         pneg_ctxt->Name[9] = 0x23;
 528         pneg_ctxt->Name[10] = 0x83;
 529         pneg_ctxt->Name[11] = 0xDE;
 530         pneg_ctxt->Name[12] = 0x96;
 531         pneg_ctxt->Name[13] = 0x8B;
 532         pneg_ctxt->Name[14] = 0xCD;
 533         pneg_ctxt->Name[15] = 0x7C;
 534 }
 535
 536 static void
 537 assemble_neg_contexts(struct smb2_negotiate_req *req,
 538                       struct TCP_Server_Info *server, unsigned int *total_len)
 539 {
 540         char *pneg_ctxt = (char *)req;
 541         unsigned int ctxt_len;
 542
 543         if (*total_len > 200) {
 544                 /* In case length corrupted don't want to overrun smb buffer */
 545                 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 546                 return;
 547         }
 548
 549         /*
 550          * round up total_len of fixed part of SMB3 negotiate request to 8
 551          * byte boundary before adding negotiate contexts
 552          */
 553         *total_len = roundup(*total_len, 8);
 554
 555         pneg_ctxt = (*total_len) + (char *)req;
 556         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 557
 558         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 559         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 560         *total_len += ctxt_len;
 561         pneg_ctxt += ctxt_len;
 562
 563         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 564         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 565         *total_len += ctxt_len;
 566         pneg_ctxt += ctxt_len;
 567
 568         if (server->compress_algorithm) {
 569                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 570                                 pneg_ctxt);
 571                 ctxt_len = DIV_ROUND_UP(
 572                         sizeof(struct smb2_compression_capabilities_context),
 573                                 8) * 8;
 574                 *total_len += ctxt_len;
 575                 pneg_ctxt += ctxt_len;
 576                 req->NegotiateContextCount = cpu_to_le16(5);
 577         } else
 578                 req->NegotiateContextCount = cpu_to_le16(4);
 579
 580         ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 581                                         server->hostname);
 582         *total_len += ctxt_len;
 583         pneg_ctxt += ctxt_len;
 584
 585         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 586         *total_len += sizeof(struct smb2_posix_neg_context);
 587 }
 588
 589 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 590 {
 591         unsigned int len = le16_to_cpu(ctxt->DataLength);
 592
 593         /* If invalid preauth context warn but use what we requested, SHA-512 */
 594         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 595                 printk_once(KERN_WARNING "server sent bad preauth context\n");
 596                 return;
 597         }
 598         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 599                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
 600         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 601                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
 602 }
 603
 604 static void decode_compress_ctx(struct TCP_Server_Info *server,
 605                          struct smb2_compression_capabilities_context *ctxt)
 606 {
 607         unsigned int len = le16_to_cpu(ctxt->DataLength);
 608
 609         /* sizeof compress context is a one element compression capbility struct */
 610         if (len < 10) {
 611                 printk_once(KERN_WARNING "server sent bad compression cntxt\n");
 612                 return;
 613         }
 614         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 615                 printk_once(KERN_WARNING "illegal SMB3 compress algorithm count\n");
 616                 return;
 617         }
 618         if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 619                 printk_once(KERN_WARNING "unknown compression algorithm\n");
 620                 return;
 621         }
 622         server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 623 }
 624
 625 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 626                               struct smb2_encryption_neg_context *ctxt)
 627 {
 628         unsigned int len = le16_to_cpu(ctxt->DataLength);
 629
 630         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 631         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 632                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
 633                 return -EINVAL;
 634         }
 635
 636         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 637                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
 638                 return -EINVAL;
 639         }
 640         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 641         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 642             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 643                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
 644                 return -EINVAL;
 645         }
 646         server->cipher_type = ctxt->Ciphers[0];
 647         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 648         return 0;
 649 }
 650
 651 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 652                                      struct TCP_Server_Info *server,
 653                                      unsigned int len_of_smb)
 654 {
 655         struct smb2_neg_context *pctx;
 656         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 657         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 658         unsigned int len_of_ctxts, i;
 659         int rc = 0;
 660
 661         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 662         if (len_of_smb <= offset) {
 663                 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 664                 return -EINVAL;
 665         }
 666
 667         len_of_ctxts = len_of_smb - offset;
 668
 669         for (i = 0; i < ctxt_cnt; i++) {
 670                 int clen;
 671                 /* check that offset is not beyond end of SMB */
 672                 if (len_of_ctxts == 0)
 673                         break;
 674
 675                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 676                         break;
 677
 678                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 679                 clen = le16_to_cpu(pctx->DataLength);
 680                 if (clen > len_of_ctxts)
 681                         break;
 682
 683                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 684                         decode_preauth_context(
 685                                 (struct smb2_preauth_neg_context *)pctx);
 686                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 687                         rc = decode_encrypt_ctx(server,
 688                                 (struct smb2_encryption_neg_context *)pctx);
 689                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 690                         decode_compress_ctx(server,
 691                                 (struct smb2_compression_capabilities_context *)pctx);
 692                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 693                         server->posix_ext_supported = true;
 694                 else
 695                         cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 696                                 le16_to_cpu(pctx->ContextType));
 697
 698                 if (rc)
 699                         break;
 700                 /* offsets must be 8 byte aligned */
 701                 clen = (clen + 7) & ~0x7;
 702                 offset += clen + sizeof(struct smb2_neg_context);
 703                 len_of_ctxts -= clen;
 704         }
 705         return rc;
 706 }
 707
 708 static struct create_posix *
 709 create_posix_buf(umode_t mode)
 710 {
 711         struct create_posix *buf;
 712
 713         buf = kzalloc(sizeof(struct create_posix),
 714                         GFP_KERNEL);
 715         if (!buf)
 716                 return NULL;
 717
 718         buf->ccontext.DataOffset =
 719                 cpu_to_le16(offsetof(struct create_posix, Mode));
 720         buf->ccontext.DataLength = cpu_to_le32(4);
 721         buf->ccontext.NameOffset =
 722                 cpu_to_le16(offsetof(struct create_posix, Name));
 723         buf->ccontext.NameLength = cpu_to_le16(16);
 724
 725         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 726         buf->Name[0] = 0x93;
 727         buf->Name[1] = 0xAD;
 728         buf->Name[2] = 0x25;
 729         buf->Name[3] = 0x50;
 730         buf->Name[4] = 0x9C;
 731         buf->Name[5] = 0xB4;
 732         buf->Name[6] = 0x11;
 733         buf->Name[7] = 0xE7;
 734         buf->Name[8] = 0xB4;
 735         buf->Name[9] = 0x23;
 736         buf->Name[10] = 0x83;
 737         buf->Name[11] = 0xDE;
 738         buf->Name[12] = 0x96;
 739         buf->Name[13] = 0x8B;
 740         buf->Name[14] = 0xCD;
 741         buf->Name[15] = 0x7C;
 742         buf->Mode = cpu_to_le32(mode);
 743         cifs_dbg(FYI, "mode on posix create 0%o", mode);
 744         return buf;
 745 }
 746
 747 static int
 748 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 749 {
 750         struct smb2_create_req *req = iov[0].iov_base;
 751         unsigned int num = *num_iovec;
 752
 753         iov[num].iov_base = create_posix_buf(mode);
 754         if (iov[num].iov_base == NULL)
 755                 return -ENOMEM;
 756         iov[num].iov_len = sizeof(struct create_posix);
 757         if (!req->CreateContextsOffset)
 758                 req->CreateContextsOffset = cpu_to_le32(
 759                                 sizeof(struct smb2_create_req) +
 760                                 iov[num - 1].iov_len);
 761         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 762         *num_iovec = num + 1;
 763         return 0;
 764 }
 765
 766
 767 /*
 768  *
 769  *      SMB2 Worker functions follow:
 770  *
 771  *      The general structure of the worker functions is:
 772  *      1) Call smb2_init (assembles SMB2 header)
 773  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 774  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 775  *      4) Decode SMB2 command specific fields in the fixed length area
 776  *      5) Decode variable length data area (if any for this SMB2 command type)
 777  *      6) Call free smb buffer
 778  *      7) return
 779  *
 780  */
 781
 782 int
 783 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 784 {
 785         struct smb_rqst rqst;
 786         struct smb2_negotiate_req *req;
 787         struct smb2_negotiate_rsp *rsp;
 788         struct kvec iov[1];
 789         struct kvec rsp_iov;
 790         int rc = 0;
 791         int resp_buftype;
 792         struct TCP_Server_Info *server = ses->server;
 793         int blob_offset, blob_length;
 794         char *security_blob;
 795         int flags = CIFS_NEG_OP;
 796         unsigned int total_len;
 797
 798         cifs_dbg(FYI, "Negotiate protocol\n");
 799
 800         if (!server) {
 801                 WARN(1, "%s: server is NULL!\n", __func__);
 802                 return -EIO;
 803         }
 804
 805         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 806         if (rc)
 807                 return rc;
 808
 809         req->sync_hdr.SessionId = 0;
 810
 811         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 812         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 813
 814         if (strcmp(ses->server->vals->version_string,
 815                    SMB3ANY_VERSION_STRING) == 0) {
 816                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 817                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 818                 req->DialectCount = cpu_to_le16(2);
 819                 total_len += 4;
 820         } else if (strcmp(server->vals->version_string,
 821                    SMBDEFAULT_VERSION_STRING) == 0) {
 822                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 823                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 824                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 825                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 826                 req->DialectCount = cpu_to_le16(4);
 827                 total_len += 8;
 828         } else {
 829                 /* otherwise send specific dialect */
 830                 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 831                 req->DialectCount = cpu_to_le16(1);
 832                 total_len += 2;
 833         }
 834
 835         /* only one of SMB2 signing flags may be set in SMB2 request */
 836         if (ses->sign)
 837                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 838         else if (global_secflags & CIFSSEC_MAY_SIGN)
 839                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 840         else
 841                 req->SecurityMode = 0;
 842
 843         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
 844
 845         /* ClientGUID must be zero for SMB2.02 dialect */
 846         if (server->vals->protocol_id == SMB20_PROT_ID)
 847                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 848         else {
 849                 memcpy(req->ClientGUID, server->client_guid,
 850                         SMB2_CLIENT_GUID_SIZE);
 851                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
 852                     (strcmp(server->vals->version_string,
 853                      SMBDEFAULT_VERSION_STRING) == 0))
 854                         assemble_neg_contexts(req, server, &total_len);
 855         }
 856         iov[0].iov_base = (char *)req;
 857         iov[0].iov_len = total_len;
 858
 859         memset(&rqst, 0, sizeof(struct smb_rqst));
 860         rqst.rq_iov = iov;
 861         rqst.rq_nvec = 1;
 862
 863         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
 864         cifs_small_buf_release(req);
 865         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 866         /*
 867          * No tcon so can't do
 868          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 869          */
 870         if (rc == -EOPNOTSUPP) {
 871                 cifs_server_dbg(VFS, "Dialect not supported by server. Consider "
 872                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 873                         " older servers\n");
 874                 goto neg_exit;
 875         } else if (rc != 0)
 876                 goto neg_exit;
 877
 878         if (strcmp(server->vals->version_string,
 879                    SMB3ANY_VERSION_STRING) == 0) {
 880                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 881                         cifs_server_dbg(VFS,
 882                                 "SMB2 dialect returned but not requested\n");
 883                         return -EIO;
 884                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 885                         cifs_server_dbg(VFS,
 886                                 "SMB2.1 dialect returned but not requested\n");
 887                         return -EIO;
 888                 }
 889         } else if (strcmp(server->vals->version_string,
 890                    SMBDEFAULT_VERSION_STRING) == 0) {
 891                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 892                         cifs_server_dbg(VFS,
 893                                 "SMB2 dialect returned but not requested\n");
 894                         return -EIO;
 895                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 896                         /* ops set to 3.0 by default for default so update */
 897                         server->ops = &smb21_operations;
 898                         server->vals = &smb21_values;
 899                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 900                         server->ops = &smb311_operations;
 901                         server->vals = &smb311_values;
 902                 }
 903         } else if (le16_to_cpu(rsp->DialectRevision) !=
 904                                 server->vals->protocol_id) {
 905                 /* if requested single dialect ensure returned dialect matched */
 906                 cifs_server_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 907                         le16_to_cpu(rsp->DialectRevision));
 908                 return -EIO;
 909         }
 910
 911         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 912
 913         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 914                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 915         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 916                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 917         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 918                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 919         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 920                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 921         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 922                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 923         else {
 924                 cifs_server_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 925                          le16_to_cpu(rsp->DialectRevision));
 926                 rc = -EIO;
 927                 goto neg_exit;
 928         }
 929         server->dialect = le16_to_cpu(rsp->DialectRevision);
 930
 931         /*
 932          * Keep a copy of the hash after negprot. This hash will be
 933          * the starting hash value for all sessions made from this
 934          * server.
 935          */
 936         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 937                SMB2_PREAUTH_HASH_SIZE);
 938
 939         /* SMB2 only has an extended negflavor */
 940         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 941         /* set it to the maximum buffer size value we can send with 1 credit */
 942         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 943                                SMB2_MAX_BUFFER_SIZE);
 944         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 945         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 946         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 947         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 948                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 949                                 server->sec_mode);
 950         server->capabilities = le32_to_cpu(rsp->Capabilities);
 951         /* Internal types */
 952         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 953
 954         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 955                                                (struct smb2_sync_hdr *)rsp);
 956         /*
 957          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 958          * for us will be
 959          *      ses->sectype = RawNTLMSSP;
 960          * but for time being this is our only auth choice so doesn't matter.
 961          * We just found a server which sets blob length to zero expecting raw.
 962          */
 963         if (blob_length == 0) {
 964                 cifs_dbg(FYI, "missing security blob on negprot\n");
 965                 server->sec_ntlmssp = true;
 966         }
 967
 968         rc = cifs_enable_signing(server, ses->sign);
 969         if (rc)
 970                 goto neg_exit;
 971         if (blob_length) {
 972                 rc = decode_negTokenInit(security_blob, blob_length, server);
 973                 if (rc == 1)
 974                         rc = 0;
 975                 else if (rc == 0)
 976                         rc = -EIO;
 977         }
 978
 979         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 980                 if (rsp->NegotiateContextCount)
 981                         rc = smb311_decode_neg_context(rsp, server,
 982                                                        rsp_iov.iov_len);
 983                 else
 984                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
 985         }
 986 neg_exit:
 987         free_rsp_buf(resp_buftype, rsp);
 988         return rc;
 989 }
 990
 991 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 992 {
 993         int rc;
 994         struct validate_negotiate_info_req *pneg_inbuf;
 995         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 996         u32 rsplen;
 997         u32 inbuflen; /* max of 4 dialects */
 998         struct TCP_Server_Info *server = tcon->ses->server;
 999
1000         cifs_dbg(FYI, "validate negotiate\n");
1001
1002         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1003         if (server->dialect == SMB311_PROT_ID)
1004                 return 0;
1005
1006         /*
1007          * validation ioctl must be signed, so no point sending this if we
1008          * can not sign it (ie are not known user).  Even if signing is not
1009          * required (enabled but not negotiated), in those cases we selectively
1010          * sign just this, the first and only signed request on a connection.
1011          * Having validation of negotiate info  helps reduce attack vectors.
1012          */
1013         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1014                 return 0; /* validation requires signing */
1015
1016         if (tcon->ses->user_name == NULL) {
1017                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1018                 return 0; /* validation requires signing */
1019         }
1020
1021         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1022                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1023
1024         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1025         if (!pneg_inbuf)
1026                 return -ENOMEM;
1027
1028         pneg_inbuf->Capabilities =
1029                         cpu_to_le32(server->vals->req_capabilities);
1030         memcpy(pneg_inbuf->Guid, server->client_guid,
1031                                         SMB2_CLIENT_GUID_SIZE);
1032
1033         if (tcon->ses->sign)
1034                 pneg_inbuf->SecurityMode =
1035                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1036         else if (global_secflags & CIFSSEC_MAY_SIGN)
1037                 pneg_inbuf->SecurityMode =
1038                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1039         else
1040                 pneg_inbuf->SecurityMode = 0;
1041
1042
1043         if (strcmp(server->vals->version_string,
1044                 SMB3ANY_VERSION_STRING) == 0) {
1045                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1046                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1047                 pneg_inbuf->DialectCount = cpu_to_le16(2);
1048                 /* structure is big enough for 3 dialects, sending only 2 */
1049                 inbuflen = sizeof(*pneg_inbuf) -
1050                                 (2 * sizeof(pneg_inbuf->Dialects[0]));
1051         } else if (strcmp(server->vals->version_string,
1052                 SMBDEFAULT_VERSION_STRING) == 0) {
1053                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1054                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1055                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1056                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1057                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1058                 /* structure is big enough for 3 dialects */
1059                 inbuflen = sizeof(*pneg_inbuf);
1060         } else {
1061                 /* otherwise specific dialect was requested */
1062                 pneg_inbuf->Dialects[0] =
1063                         cpu_to_le16(server->vals->protocol_id);
1064                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1065                 /* structure is big enough for 3 dialects, sending only 1 */
1066                 inbuflen = sizeof(*pneg_inbuf) -
1067                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
1068         }
1069
1070         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1071                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1072                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1073                 (char **)&pneg_rsp, &rsplen);
1074         if (rc == -EOPNOTSUPP) {
1075                 /*
1076                  * Old Windows versions or Netapp SMB server can return
1077                  * not supported error. Client should accept it.
1078                  */
1079                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1080                 rc = 0;
1081                 goto out_free_inbuf;
1082         } else if (rc != 0) {
1083                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
1084                 rc = -EIO;
1085                 goto out_free_inbuf;
1086         }
1087
1088         rc = -EIO;
1089         if (rsplen != sizeof(*pneg_rsp)) {
1090                 cifs_tcon_dbg(VFS, "invalid protocol negotiate response size: %d\n",
1091                          rsplen);
1092
1093                 /* relax check since Mac returns max bufsize allowed on ioctl */
1094                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1095                         goto out_free_rsp;
1096         }
1097
1098         /* check validate negotiate info response matches what we got earlier */
1099         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1100                 goto vneg_out;
1101
1102         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1103                 goto vneg_out;
1104
1105         /* do not validate server guid because not saved at negprot time yet */
1106
1107         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1108               SMB2_LARGE_FILES) != server->capabilities)
1109                 goto vneg_out;
1110
1111         /* validate negotiate successful */
1112         rc = 0;
1113         cifs_dbg(FYI, "validate negotiate info successful\n");
1114         goto out_free_rsp;
1115
1116 vneg_out:
1117         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1118 out_free_rsp:
1119         kfree(pneg_rsp);
1120 out_free_inbuf:
1121         kfree(pneg_inbuf);
1122         return rc;
1123 }
1124
1125 enum securityEnum
1126 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1127 {
1128         switch (requested) {
1129         case Kerberos:
1130         case RawNTLMSSP:
1131                 return requested;
1132         case NTLMv2:
1133                 return RawNTLMSSP;
1134         case Unspecified:
1135                 if (server->sec_ntlmssp &&
1136                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1137                         return RawNTLMSSP;
1138                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1139                         (global_secflags & CIFSSEC_MAY_KRB5))
1140                         return Kerberos;
1141                 /* Fallthrough */
1142         default:
1143                 return Unspecified;
1144         }
1145 }
1146
1147 struct SMB2_sess_data {
1148         unsigned int xid;
1149         struct cifs_ses *ses;
1150         struct nls_table *nls_cp;
1151         void (*func)(struct SMB2_sess_data *);
1152         int result;
1153         u64 previous_session;
1154
1155         /* we will send the SMB in three pieces:
1156          * a fixed length beginning part, an optional
1157          * SPNEGO blob (which can be zero length), and a
1158          * last part which will include the strings
1159          * and rest of bcc area. This allows us to avoid
1160          * a large buffer 17K allocation
1161          */
1162         int buf0_type;
1163         struct kvec iov[2];
1164 };
1165
1166 static int
1167 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1168 {
1169         int rc;
1170         struct cifs_ses *ses = sess_data->ses;
1171         struct smb2_sess_setup_req *req;
1172         struct TCP_Server_Info *server = ses->server;
1173         unsigned int total_len;
1174
1175         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
1176                              &total_len);
1177         if (rc)
1178                 return rc;
1179
1180         /* First session, not a reauthenticate */
1181         req->sync_hdr.SessionId = 0;
1182
1183         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
1184         req->PreviousSessionId = sess_data->previous_session;
1185
1186         req->Flags = 0; /* MBZ */
1187
1188         /* enough to enable echos and oplocks and one max size write */
1189         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1190
1191         /* only one of SMB2 signing flags may be set in SMB2 request */
1192         if (server->sign)
1193                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1194         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1195                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1196         else
1197                 req->SecurityMode = 0;
1198
1199 #ifdef CONFIG_CIFS_DFS_UPCALL
1200         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1201 #else
1202         req->Capabilities = 0;
1203 #endif /* DFS_UPCALL */
1204
1205         req->Channel = 0; /* MBZ */
1206
1207         sess_data->iov[0].iov_base = (char *)req;
1208         /* 1 for pad */
1209         sess_data->iov[0].iov_len = total_len - 1;
1210         /*
1211          * This variable will be used to clear the buffer
1212          * allocated above in case of any error in the calling function.
1213          */
1214         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1215
1216         return 0;
1217 }
1218
1219 static void
1220 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1221 {
1222         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1223         sess_data->buf0_type = CIFS_NO_BUFFER;
1224 }
1225
1226 static int
1227 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1228 {
1229         int rc;
1230         struct smb_rqst rqst;
1231         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1232         struct kvec rsp_iov = { NULL, 0 };
1233
1234         /* Testing shows that buffer offset must be at location of Buffer[0] */
1235         req->SecurityBufferOffset =
1236                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1237         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1238
1239         memset(&rqst, 0, sizeof(struct smb_rqst));
1240         rqst.rq_iov = sess_data->iov;
1241         rqst.rq_nvec = 2;
1242
1243         /* BB add code to build os and lm fields */
1244         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1245                             &rqst,
1246                             &sess_data->buf0_type,
1247                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1248         cifs_small_buf_release(sess_data->iov[0].iov_base);
1249         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1250
1251         return rc;
1252 }
1253
1254 static int
1255 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1256 {
1257         int rc = 0;
1258         struct cifs_ses *ses = sess_data->ses;
1259
1260         mutex_lock(&ses->server->srv_mutex);
1261         if (ses->server->ops->generate_signingkey) {
1262                 rc = ses->server->ops->generate_signingkey(ses);
1263                 if (rc) {
1264                         cifs_dbg(FYI,
1265                                 "SMB3 session key generation failed\n");
1266                         mutex_unlock(&ses->server->srv_mutex);
1267                         return rc;
1268                 }
1269         }
1270         if (!ses->server->session_estab) {
1271                 ses->server->sequence_number = 0x2;
1272                 ses->server->session_estab = true;
1273         }
1274         mutex_unlock(&ses->server->srv_mutex);
1275
1276         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1277         spin_lock(&GlobalMid_Lock);
1278         ses->status = CifsGood;
1279         ses->need_reconnect = false;
1280         spin_unlock(&GlobalMid_Lock);
1281         return rc;
1282 }
1283
1284 #ifdef CONFIG_CIFS_UPCALL
1285 static void
1286 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1287 {
1288         int rc;
1289         struct cifs_ses *ses = sess_data->ses;
1290         struct cifs_spnego_msg *msg;
1291         struct key *spnego_key = NULL;
1292         struct smb2_sess_setup_rsp *rsp = NULL;
1293
1294         rc = SMB2_sess_alloc_buffer(sess_data);
1295         if (rc)
1296                 goto out;
1297
1298         spnego_key = cifs_get_spnego_key(ses);
1299         if (IS_ERR(spnego_key)) {
1300                 rc = PTR_ERR(spnego_key);
1301                 spnego_key = NULL;
1302                 goto out;
1303         }
1304
1305         msg = spnego_key->payload.data[0];
1306         /*
1307          * check version field to make sure that cifs.upcall is
1308          * sending us a response in an expected form
1309          */
1310         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1311                 cifs_dbg(VFS,
1312                           "bad cifs.upcall version. Expected %d got %d",
1313                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1314                 rc = -EKEYREJECTED;
1315                 goto out_put_spnego_key;
1316         }
1317
1318         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1319                                          GFP_KERNEL);
1320         if (!ses->auth_key.response) {
1321                 cifs_dbg(VFS,
1322                         "Kerberos can't allocate (%u bytes) memory",
1323                         msg->sesskey_len);
1324                 rc = -ENOMEM;
1325                 goto out_put_spnego_key;
1326         }
1327         ses->auth_key.len = msg->sesskey_len;
1328
1329         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1330         sess_data->iov[1].iov_len = msg->secblob_len;
1331
1332         rc = SMB2_sess_sendreceive(sess_data);
1333         if (rc)
1334                 goto out_put_spnego_key;
1335
1336         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1337         ses->Suid = rsp->sync_hdr.SessionId;
1338
1339         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1340
1341         rc = SMB2_sess_establish_session(sess_data);
1342 out_put_spnego_key:
1343         key_invalidate(spnego_key);
1344         key_put(spnego_key);
1345 out:
1346         sess_data->result = rc;
1347         sess_data->func = NULL;
1348         SMB2_sess_free_buffer(sess_data);
1349 }
1350 #else
1351 static void
1352 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1353 {
1354         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1355         sess_data->result = -EOPNOTSUPP;
1356         sess_data->func = NULL;
1357 }
1358 #endif
1359
1360 static void
1361 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1362
1363 static void
1364 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1365 {
1366         int rc;
1367         struct cifs_ses *ses = sess_data->ses;
1368         struct smb2_sess_setup_rsp *rsp = NULL;
1369         char *ntlmssp_blob = NULL;
1370         bool use_spnego = false; /* else use raw ntlmssp */
1371         u16 blob_length = 0;
1372
1373         /*
1374          * If memory allocation is successful, caller of this function
1375          * frees it.
1376          */
1377         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1378         if (!ses->ntlmssp) {
1379                 rc = -ENOMEM;
1380                 goto out_err;
1381         }
1382         ses->ntlmssp->sesskey_per_smbsess = true;
1383
1384         rc = SMB2_sess_alloc_buffer(sess_data);
1385         if (rc)
1386                 goto out_err;
1387
1388         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1389                                GFP_KERNEL);
1390         if (ntlmssp_blob == NULL) {
1391                 rc = -ENOMEM;
1392                 goto out;
1393         }
1394
1395         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1396         if (use_spnego) {
1397                 /* BB eventually need to add this */
1398                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1399                 rc = -EOPNOTSUPP;
1400                 goto out;
1401         } else {
1402                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1403                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1404         }
1405         sess_data->iov[1].iov_base = ntlmssp_blob;
1406         sess_data->iov[1].iov_len = blob_length;
1407
1408         rc = SMB2_sess_sendreceive(sess_data);
1409         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1410
1411         /* If true, rc here is expected and not an error */
1412         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1413                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1414                 rc = 0;
1415
1416         if (rc)
1417                 goto out;
1418
1419         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1420                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1421                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1422                         le16_to_cpu(rsp->SecurityBufferOffset));
1423                 rc = -EIO;
1424                 goto out;
1425         }
1426         rc = decode_ntlmssp_challenge(rsp->Buffer,
1427                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1428         if (rc)
1429                 goto out;
1430
1431         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1432
1433
1434         ses->Suid = rsp->sync_hdr.SessionId;
1435         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1436
1437 out:
1438         kfree(ntlmssp_blob);
1439         SMB2_sess_free_buffer(sess_data);
1440         if (!rc) {
1441                 sess_data->result = 0;
1442                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1443                 return;
1444         }
1445 out_err:
1446         kfree(ses->ntlmssp);
1447         ses->ntlmssp = NULL;
1448         sess_data->result = rc;
1449         sess_data->func = NULL;
1450 }
1451
1452 static void
1453 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1454 {
1455         int rc;
1456         struct cifs_ses *ses = sess_data->ses;
1457         struct smb2_sess_setup_req *req;
1458         struct smb2_sess_setup_rsp *rsp = NULL;
1459         unsigned char *ntlmssp_blob = NULL;
1460         bool use_spnego = false; /* else use raw ntlmssp */
1461         u16 blob_length = 0;
1462
1463         rc = SMB2_sess_alloc_buffer(sess_data);
1464         if (rc)
1465                 goto out;
1466
1467         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1468         req->sync_hdr.SessionId = ses->Suid;
1469
1470         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1471                                         sess_data->nls_cp);
1472         if (rc) {
1473                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1474                 goto out;
1475         }
1476
1477         if (use_spnego) {
1478                 /* BB eventually need to add this */
1479                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1480                 rc = -EOPNOTSUPP;
1481                 goto out;
1482         }
1483         sess_data->iov[1].iov_base = ntlmssp_blob;
1484         sess_data->iov[1].iov_len = blob_length;
1485
1486         rc = SMB2_sess_sendreceive(sess_data);
1487         if (rc)
1488                 goto out;
1489
1490         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1491
1492         ses->Suid = rsp->sync_hdr.SessionId;
1493         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1494
1495         rc = SMB2_sess_establish_session(sess_data);
1496 out:
1497         kfree(ntlmssp_blob);
1498         SMB2_sess_free_buffer(sess_data);
1499         kfree(ses->ntlmssp);
1500         ses->ntlmssp = NULL;
1501         sess_data->result = rc;
1502         sess_data->func = NULL;
1503 }
1504
1505 static int
1506 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1507 {
1508         int type;
1509
1510         type = smb2_select_sectype(ses->server, ses->sectype);
1511         cifs_dbg(FYI, "sess setup type %d\n", type);
1512         if (type == Unspecified) {
1513                 cifs_dbg(VFS,
1514                         "Unable to select appropriate authentication method!");
1515                 return -EINVAL;
1516         }
1517
1518         switch (type) {
1519         case Kerberos:
1520                 sess_data->func = SMB2_auth_kerberos;
1521                 break;
1522         case RawNTLMSSP:
1523                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1524                 break;
1525         default:
1526                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1527                 return -EOPNOTSUPP;
1528         }
1529
1530         return 0;
1531 }
1532
1533 int
1534 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1535                 const struct nls_table *nls_cp)
1536 {
1537         int rc = 0;
1538         struct TCP_Server_Info *server = ses->server;
1539         struct SMB2_sess_data *sess_data;
1540
1541         cifs_dbg(FYI, "Session Setup\n");
1542
1543         if (!server) {
1544                 WARN(1, "%s: server is NULL!\n", __func__);
1545                 return -EIO;
1546         }
1547
1548         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1549         if (!sess_data)
1550                 return -ENOMEM;
1551
1552         rc = SMB2_select_sec(ses, sess_data);
1553         if (rc)
1554                 goto out;
1555         sess_data->xid = xid;
1556         sess_data->ses = ses;
1557         sess_data->buf0_type = CIFS_NO_BUFFER;
1558         sess_data->nls_cp = (struct nls_table *) nls_cp;
1559         sess_data->previous_session = ses->Suid;
1560
1561         /*
1562          * Initialize the session hash with the server one.
1563          */
1564         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1565                SMB2_PREAUTH_HASH_SIZE);
1566
1567         while (sess_data->func)
1568                 sess_data->func(sess_data);
1569
1570         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1571                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1572         rc = sess_data->result;
1573 out:
1574         kfree(sess_data);
1575         return rc;
1576 }
1577
1578 int
1579 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1580 {
1581         struct smb_rqst rqst;
1582         struct smb2_logoff_req *req; /* response is also trivial struct */
1583         int rc = 0;
1584         struct TCP_Server_Info *server;
1585         int flags = 0;
1586         unsigned int total_len;
1587         struct kvec iov[1];
1588         struct kvec rsp_iov;
1589         int resp_buf_type;
1590
1591         cifs_dbg(FYI, "disconnect session %p\n", ses);
1592
1593         if (ses && (ses->server))
1594                 server = ses->server;
1595         else
1596                 return -EIO;
1597
1598         /* no need to send SMB logoff if uid already closed due to reconnect */
1599         if (ses->need_reconnect)
1600                 goto smb2_session_already_dead;
1601
1602         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1603         if (rc)
1604                 return rc;
1605
1606          /* since no tcon, smb2_init can not do this, so do here */
1607         req->sync_hdr.SessionId = ses->Suid;
1608
1609         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1610                 flags |= CIFS_TRANSFORM_REQ;
1611         else if (server->sign)
1612                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1613
1614         flags |= CIFS_NO_RSP_BUF;
1615
1616         iov[0].iov_base = (char *)req;
1617         iov[0].iov_len = total_len;
1618
1619         memset(&rqst, 0, sizeof(struct smb_rqst));
1620         rqst.rq_iov = iov;
1621         rqst.rq_nvec = 1;
1622
1623         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1624         cifs_small_buf_release(req);
1625         /*
1626          * No tcon so can't do
1627          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1628          */
1629
1630 smb2_session_already_dead:
1631         return rc;
1632 }
1633
1634 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1635 {
1636         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1637 }
1638
1639 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1640
1641 /* These are similar values to what Windows uses */
1642 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1643 {
1644         tcon->max_chunks = 256;
1645         tcon->max_bytes_chunk = 1048576;
1646         tcon->max_bytes_copy = 16777216;
1647 }
1648
1649 int
1650 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1651           struct cifs_tcon *tcon, const struct nls_table *cp)
1652 {
1653         struct smb_rqst rqst;
1654         struct smb2_tree_connect_req *req;
1655         struct smb2_tree_connect_rsp *rsp = NULL;
1656         struct kvec iov[2];
1657         struct kvec rsp_iov = { NULL, 0 };
1658         int rc = 0;
1659         int resp_buftype;
1660         int unc_path_len;
1661         __le16 *unc_path = NULL;
1662         int flags = 0;
1663         unsigned int total_len;
1664         struct TCP_Server_Info *server = ses->server;
1665
1666         cifs_dbg(FYI, "TCON\n");
1667
1668         if (!server || !tree)
1669                 return -EIO;
1670
1671         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1672         if (unc_path == NULL)
1673                 return -ENOMEM;
1674
1675         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1676         unc_path_len *= 2;
1677         if (unc_path_len < 2) {
1678                 kfree(unc_path);
1679                 return -EINVAL;
1680         }
1681
1682         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1683         tcon->tid = 0;
1684         atomic_set(&tcon->num_remote_opens, 0);
1685         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1686                              &total_len);
1687         if (rc) {
1688                 kfree(unc_path);
1689                 return rc;
1690         }
1691
1692         if (smb3_encryption_required(tcon))
1693                 flags |= CIFS_TRANSFORM_REQ;
1694
1695         iov[0].iov_base = (char *)req;
1696         /* 1 for pad */
1697         iov[0].iov_len = total_len - 1;
1698
1699         /* Testing shows that buffer offset must be at location of Buffer[0] */
1700         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1701                         - 1 /* pad */);
1702         req->PathLength = cpu_to_le16(unc_path_len - 2);
1703         iov[1].iov_base = unc_path;
1704         iov[1].iov_len = unc_path_len;
1705
1706         /*
1707          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1708          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1709          * (Samba servers don't always set the flag so also check if null user)
1710          */
1711         if ((server->dialect == SMB311_PROT_ID) &&
1712             !smb3_encryption_required(tcon) &&
1713             !(ses->session_flags &
1714                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1715             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1716                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1717
1718         memset(&rqst, 0, sizeof(struct smb_rqst));
1719         rqst.rq_iov = iov;
1720         rqst.rq_nvec = 2;
1721
1722         /* Need 64 for max size write so ask for more in case not there yet */
1723         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1724
1725         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1726         cifs_small_buf_release(req);
1727         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1728         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1729         if (rc != 0) {
1730                 if (tcon) {
1731                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1732                         tcon->need_reconnect = true;
1733                 }
1734                 goto tcon_error_exit;
1735         }
1736
1737         switch (rsp->ShareType) {
1738         case SMB2_SHARE_TYPE_DISK:
1739                 cifs_dbg(FYI, "connection to disk share\n");
1740                 break;
1741         case SMB2_SHARE_TYPE_PIPE:
1742                 tcon->pipe = true;
1743                 cifs_dbg(FYI, "connection to pipe share\n");
1744                 break;
1745         case SMB2_SHARE_TYPE_PRINT:
1746                 tcon->print = true;
1747                 cifs_dbg(FYI, "connection to printer\n");
1748                 break;
1749         default:
1750                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1751                 rc = -EOPNOTSUPP;
1752                 goto tcon_error_exit;
1753         }
1754
1755         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1756         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1757         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1758         tcon->tidStatus = CifsGood;
1759         tcon->need_reconnect = false;
1760         tcon->tid = rsp->sync_hdr.TreeId;
1761         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1762
1763         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1764             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1765                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1766
1767         if (tcon->seal &&
1768             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1769                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1770
1771         init_copy_chunk_defaults(tcon);
1772         if (server->ops->validate_negotiate)
1773                 rc = server->ops->validate_negotiate(xid, tcon);
1774 tcon_exit:
1775
1776         free_rsp_buf(resp_buftype, rsp);
1777         kfree(unc_path);
1778         return rc;
1779
1780 tcon_error_exit:
1781         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1782                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1783         }
1784         goto tcon_exit;
1785 }
1786
1787 int
1788 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1789 {
1790         struct smb_rqst rqst;
1791         struct smb2_tree_disconnect_req *req; /* response is trivial */
1792         int rc = 0;
1793         struct cifs_ses *ses = tcon->ses;
1794         int flags = 0;
1795         unsigned int total_len;
1796         struct kvec iov[1];
1797         struct kvec rsp_iov;
1798         int resp_buf_type;
1799
1800         cifs_dbg(FYI, "Tree Disconnect\n");
1801
1802         if (!ses || !(ses->server))
1803                 return -EIO;
1804
1805         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1806                 return 0;
1807
1808         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1809                              &total_len);
1810         if (rc)
1811                 return rc;
1812
1813         if (smb3_encryption_required(tcon))
1814                 flags |= CIFS_TRANSFORM_REQ;
1815
1816         flags |= CIFS_NO_RSP_BUF;
1817
1818         iov[0].iov_base = (char *)req;
1819         iov[0].iov_len = total_len;
1820
1821         memset(&rqst, 0, sizeof(struct smb_rqst));
1822         rqst.rq_iov = iov;
1823         rqst.rq_nvec = 1;
1824
1825         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1826         cifs_small_buf_release(req);
1827         if (rc)
1828                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1829
1830         return rc;
1831 }
1832
1833
1834 static struct create_durable *
1835 create_durable_buf(void)
1836 {
1837         struct create_durable *buf;
1838
1839         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1840         if (!buf)
1841                 return NULL;
1842
1843         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1844                                         (struct create_durable, Data));
1845         buf->ccontext.DataLength = cpu_to_le32(16);
1846         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1847                                 (struct create_durable, Name));
1848         buf->ccontext.NameLength = cpu_to_le16(4);
1849         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1850         buf->Name[0] = 'D';
1851         buf->Name[1] = 'H';
1852         buf->Name[2] = 'n';
1853         buf->Name[3] = 'Q';
1854         return buf;
1855 }
1856
1857 static struct create_durable *
1858 create_reconnect_durable_buf(struct cifs_fid *fid)
1859 {
1860         struct create_durable *buf;
1861
1862         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1863         if (!buf)
1864                 return NULL;
1865
1866         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1867                                         (struct create_durable, Data));
1868         buf->ccontext.DataLength = cpu_to_le32(16);
1869         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1870                                 (struct create_durable, Name));
1871         buf->ccontext.NameLength = cpu_to_le16(4);
1872         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1873         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1874         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1875         buf->Name[0] = 'D';
1876         buf->Name[1] = 'H';
1877         buf->Name[2] = 'n';
1878         buf->Name[3] = 'C';
1879         return buf;
1880 }
1881
1882 static void
1883 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
1884 {
1885         struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
1886
1887         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
1888                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
1889         buf->IndexNumber = pdisk_id->DiskFileId;
1890 }
1891
1892 void
1893 smb2_parse_contexts(struct TCP_Server_Info *server,
1894                        struct smb2_create_rsp *rsp,
1895                        unsigned int *epoch, char *lease_key, __u8 *oplock,
1896                        struct smb2_file_all_info *buf)
1897 {
1898         char *data_offset;
1899         struct create_context *cc;
1900         unsigned int next;
1901         unsigned int remaining;
1902         char *name;
1903
1904         *oplock = 0;
1905         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1906         remaining = le32_to_cpu(rsp->CreateContextsLength);
1907         cc = (struct create_context *)data_offset;
1908
1909         /* Initialize inode number to 0 in case no valid data in qfid context */
1910         if (buf)
1911                 buf->IndexNumber = 0;
1912
1913         while (remaining >= sizeof(struct create_context)) {
1914                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1915                 if (le16_to_cpu(cc->NameLength) == 4 &&
1916                     strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
1917                         *oplock = server->ops->parse_lease_buf(cc, epoch,
1918                                                            lease_key);
1919                 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
1920                     strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
1921                         parse_query_id_ctxt(cc, buf);
1922
1923                 next = le32_to_cpu(cc->Next);
1924                 if (!next)
1925                         break;
1926                 remaining -= next;
1927                 cc = (struct create_context *)((char *)cc + next);
1928         }
1929
1930         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
1931                 *oplock = rsp->OplockLevel;
1932
1933         return;
1934 }
1935
1936 static int
1937 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1938                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1939 {
1940         struct smb2_create_req *req = iov[0].iov_base;
1941         unsigned int num = *num_iovec;
1942
1943         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1944         if (iov[num].iov_base == NULL)
1945                 return -ENOMEM;
1946         iov[num].iov_len = server->vals->create_lease_size;
1947         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1948         if (!req->CreateContextsOffset)
1949                 req->CreateContextsOffset = cpu_to_le32(
1950                                 sizeof(struct smb2_create_req) +
1951                                 iov[num - 1].iov_len);
1952         le32_add_cpu(&req->CreateContextsLength,
1953                      server->vals->create_lease_size);
1954         *num_iovec = num + 1;
1955         return 0;
1956 }
1957
1958 static struct create_durable_v2 *
1959 create_durable_v2_buf(struct cifs_open_parms *oparms)
1960 {
1961         struct cifs_fid *pfid = oparms->fid;
1962         struct create_durable_v2 *buf;
1963
1964         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1965         if (!buf)
1966                 return NULL;
1967
1968         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1969                                         (struct create_durable_v2, dcontext));
1970         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1971         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1972                                 (struct create_durable_v2, Name));
1973         buf->ccontext.NameLength = cpu_to_le16(4);
1974
1975         /*
1976          * NB: Handle timeout defaults to 0, which allows server to choose
1977          * (most servers default to 120 seconds) and most clients default to 0.
1978          * This can be overridden at mount ("handletimeout=") if the user wants
1979          * a different persistent (or resilient) handle timeout for all opens
1980          * opens on a particular SMB3 mount.
1981          */
1982         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
1983         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1984         generate_random_uuid(buf->dcontext.CreateGuid);
1985         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1986
1987         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1988         buf->Name[0] = 'D';
1989         buf->Name[1] = 'H';
1990         buf->Name[2] = '2';
1991         buf->Name[3] = 'Q';
1992         return buf;
1993 }
1994
1995 static struct create_durable_handle_reconnect_v2 *
1996 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1997 {
1998         struct create_durable_handle_reconnect_v2 *buf;
1999
2000         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2001                         GFP_KERNEL);
2002         if (!buf)
2003                 return NULL;
2004
2005         buf->ccontext.DataOffset =
2006                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2007                                      dcontext));
2008         buf->ccontext.DataLength =
2009                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2010         buf->ccontext.NameOffset =
2011                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2012                             Name));
2013         buf->ccontext.NameLength = cpu_to_le16(4);
2014
2015         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2016         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2017         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2018         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2019
2020         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2021         buf->Name[0] = 'D';
2022         buf->Name[1] = 'H';
2023         buf->Name[2] = '2';
2024         buf->Name[3] = 'C';
2025         return buf;
2026 }
2027
2028 static int
2029 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2030                     struct cifs_open_parms *oparms)
2031 {
2032         struct smb2_create_req *req = iov[0].iov_base;
2033         unsigned int num = *num_iovec;
2034
2035         iov[num].iov_base = create_durable_v2_buf(oparms);
2036         if (iov[num].iov_base == NULL)
2037                 return -ENOMEM;
2038         iov[num].iov_len = sizeof(struct create_durable_v2);
2039         if (!req->CreateContextsOffset)
2040                 req->CreateContextsOffset =
2041                         cpu_to_le32(sizeof(struct smb2_create_req) +
2042                                                                 iov[1].iov_len);
2043         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2044         *num_iovec = num + 1;
2045         return 0;
2046 }
2047
2048 static int
2049 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2050                     struct cifs_open_parms *oparms)
2051 {
2052         struct smb2_create_req *req = iov[0].iov_base;
2053         unsigned int num = *num_iovec;
2054
2055         /* indicate that we don't need to relock the file */
2056         oparms->reconnect = false;
2057
2058         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2059         if (iov[num].iov_base == NULL)
2060                 return -ENOMEM;
2061         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2062         if (!req->CreateContextsOffset)
2063                 req->CreateContextsOffset =
2064                         cpu_to_le32(sizeof(struct smb2_create_req) +
2065                                                                 iov[1].iov_len);
2066         le32_add_cpu(&req->CreateContextsLength,
2067                         sizeof(struct create_durable_handle_reconnect_v2));
2068         *num_iovec = num + 1;
2069         return 0;
2070 }
2071
2072 static int
2073 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2074                     struct cifs_open_parms *oparms, bool use_persistent)
2075 {
2076         struct smb2_create_req *req = iov[0].iov_base;
2077         unsigned int num = *num_iovec;
2078
2079         if (use_persistent) {
2080                 if (oparms->reconnect)
2081                         return add_durable_reconnect_v2_context(iov, num_iovec,
2082                                                                 oparms);
2083                 else
2084                         return add_durable_v2_context(iov, num_iovec, oparms);
2085         }
2086
2087         if (oparms->reconnect) {
2088                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2089                 /* indicate that we don't need to relock the file */
2090                 oparms->reconnect = false;
2091         } else
2092                 iov[num].iov_base = create_durable_buf();
2093         if (iov[num].iov_base == NULL)
2094                 return -ENOMEM;
2095         iov[num].iov_len = sizeof(struct create_durable);
2096         if (!req->CreateContextsOffset)
2097                 req->CreateContextsOffset =
2098                         cpu_to_le32(sizeof(struct smb2_create_req) +
2099                                                                 iov[1].iov_len);
2100         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2101         *num_iovec = num + 1;
2102         return 0;
2103 }
2104
2105 /* See MS-SMB2 2.2.13.2.7 */
2106 static struct crt_twarp_ctxt *
2107 create_twarp_buf(__u64 timewarp)
2108 {
2109         struct crt_twarp_ctxt *buf;
2110
2111         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2112         if (!buf)
2113                 return NULL;
2114
2115         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2116                                         (struct crt_twarp_ctxt, Timestamp));
2117         buf->ccontext.DataLength = cpu_to_le32(8);
2118         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2119                                 (struct crt_twarp_ctxt, Name));
2120         buf->ccontext.NameLength = cpu_to_le16(4);
2121         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2122         buf->Name[0] = 'T';
2123         buf->Name[1] = 'W';
2124         buf->Name[2] = 'r';
2125         buf->Name[3] = 'p';
2126         buf->Timestamp = cpu_to_le64(timewarp);
2127         return buf;
2128 }
2129
2130 /* See MS-SMB2 2.2.13.2.7 */
2131 static int
2132 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2133 {
2134         struct smb2_create_req *req = iov[0].iov_base;
2135         unsigned int num = *num_iovec;
2136
2137         iov[num].iov_base = create_twarp_buf(timewarp);
2138         if (iov[num].iov_base == NULL)
2139                 return -ENOMEM;
2140         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2141         if (!req->CreateContextsOffset)
2142                 req->CreateContextsOffset = cpu_to_le32(
2143                                 sizeof(struct smb2_create_req) +
2144                                 iov[num - 1].iov_len);
2145         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2146         *num_iovec = num + 1;
2147         return 0;
2148 }
2149
2150 static struct crt_query_id_ctxt *
2151 create_query_id_buf(void)
2152 {
2153         struct crt_query_id_ctxt *buf;
2154
2155         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2156         if (!buf)
2157                 return NULL;
2158
2159         buf->ccontext.DataOffset = cpu_to_le16(0);
2160         buf->ccontext.DataLength = cpu_to_le32(0);
2161         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2162                                 (struct crt_query_id_ctxt, Name));
2163         buf->ccontext.NameLength = cpu_to_le16(4);
2164         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2165         buf->Name[0] = 'Q';
2166         buf->Name[1] = 'F';
2167         buf->Name[2] = 'i';
2168         buf->Name[3] = 'd';
2169         return buf;
2170 }
2171
2172 /* See MS-SMB2 2.2.13.2.9 */
2173 static int
2174 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2175 {
2176         struct smb2_create_req *req = iov[0].iov_base;
2177         unsigned int num = *num_iovec;
2178
2179         iov[num].iov_base = create_query_id_buf();
2180         if (iov[num].iov_base == NULL)
2181                 return -ENOMEM;
2182         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2183         if (!req->CreateContextsOffset)
2184                 req->CreateContextsOffset = cpu_to_le32(
2185                                 sizeof(struct smb2_create_req) +
2186                                 iov[num - 1].iov_len);
2187         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2188         *num_iovec = num + 1;
2189         return 0;
2190 }
2191
2192 static int
2193 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2194                             const char *treename, const __le16 *path)
2195 {
2196         int treename_len, path_len;
2197         struct nls_table *cp;
2198         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2199
2200         /*
2201          * skip leading "\\"
2202          */
2203         treename_len = strlen(treename);
2204         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2205                 return -EINVAL;
2206
2207         treename += 2;
2208         treename_len -= 2;
2209
2210         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2211
2212         /*
2213          * make room for one path separator between the treename and
2214          * path
2215          */
2216         *out_len = treename_len + 1 + path_len;
2217
2218         /*
2219          * final path needs to be null-terminated UTF16 with a
2220          * size aligned to 8
2221          */
2222
2223         *out_size = roundup((*out_len+1)*2, 8);
2224         *out_path = kzalloc(*out_size, GFP_KERNEL);
2225         if (!*out_path)
2226                 return -ENOMEM;
2227
2228         cp = load_nls_default();
2229         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2230         UniStrcat(*out_path, sep);
2231         UniStrcat(*out_path, path);
2232         unload_nls(cp);
2233
2234         return 0;
2235 }
2236
2237 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2238                                umode_t mode, struct cifs_tcon *tcon,
2239                                const char *full_path,
2240                                struct cifs_sb_info *cifs_sb)
2241 {
2242         struct smb_rqst rqst;
2243         struct smb2_create_req *req;
2244         struct smb2_create_rsp *rsp = NULL;
2245         struct cifs_ses *ses = tcon->ses;
2246         struct kvec iov[3]; /* make sure at least one for each open context */
2247         struct kvec rsp_iov = {NULL, 0};
2248         int resp_buftype;
2249         int uni_path_len;
2250         __le16 *copy_path = NULL;
2251         int copy_size;
2252         int rc = 0;
2253         unsigned int n_iov = 2;
2254         __u32 file_attributes = 0;
2255         char *pc_buf = NULL;
2256         int flags = 0;
2257         unsigned int total_len;
2258         __le16 *utf16_path = NULL;
2259
2260         cifs_dbg(FYI, "mkdir\n");
2261
2262         /* resource #1: path allocation */
2263         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2264         if (!utf16_path)
2265                 return -ENOMEM;
2266
2267         if (!ses || !(ses->server)) {
2268                 rc = -EIO;
2269                 goto err_free_path;
2270         }
2271
2272         /* resource #2: request */
2273         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2274         if (rc)
2275                 goto err_free_path;
2276
2277
2278         if (smb3_encryption_required(tcon))
2279                 flags |= CIFS_TRANSFORM_REQ;
2280
2281         req->ImpersonationLevel = IL_IMPERSONATION;
2282         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2283         /* File attributes ignored on open (used in create though) */
2284         req->FileAttributes = cpu_to_le32(file_attributes);
2285         req->ShareAccess = FILE_SHARE_ALL_LE;
2286         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2287         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2288
2289         iov[0].iov_base = (char *)req;
2290         /* -1 since last byte is buf[0] which is sent below (path) */
2291         iov[0].iov_len = total_len - 1;
2292
2293         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2294
2295         /* [MS-SMB2] 2.2.13 NameOffset:
2296          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2297          * the SMB2 header, the file name includes a prefix that will
2298          * be processed during DFS name normalization as specified in
2299          * section 3.3.5.9. Otherwise, the file name is relative to
2300          * the share that is identified by the TreeId in the SMB2
2301          * header.
2302          */
2303         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2304                 int name_len;
2305
2306                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2307                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2308                                                  &name_len,
2309                                                  tcon->treeName, utf16_path);
2310                 if (rc)
2311                         goto err_free_req;
2312
2313                 req->NameLength = cpu_to_le16(name_len * 2);
2314                 uni_path_len = copy_size;
2315                 /* free before overwriting resource */
2316                 kfree(utf16_path);
2317                 utf16_path = copy_path;
2318         } else {
2319                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2320                 /* MUST set path len (NameLength) to 0 opening root of share */
2321                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2322                 if (uni_path_len % 8 != 0) {
2323                         copy_size = roundup(uni_path_len, 8);
2324                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2325                         if (!copy_path) {
2326                                 rc = -ENOMEM;
2327                                 goto err_free_req;
2328                         }
2329                         memcpy((char *)copy_path, (const char *)utf16_path,
2330                                uni_path_len);
2331                         uni_path_len = copy_size;
2332                         /* free before overwriting resource */
2333                         kfree(utf16_path);
2334                         utf16_path = copy_path;
2335                 }
2336         }
2337
2338         iov[1].iov_len = uni_path_len;
2339         iov[1].iov_base = utf16_path;
2340         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2341
2342         if (tcon->posix_extensions) {
2343                 /* resource #3: posix buf */
2344                 rc = add_posix_context(iov, &n_iov, mode);
2345                 if (rc)
2346                         goto err_free_req;
2347                 pc_buf = iov[n_iov-1].iov_base;
2348         }
2349
2350
2351         memset(&rqst, 0, sizeof(struct smb_rqst));
2352         rqst.rq_iov = iov;
2353         rqst.rq_nvec = n_iov;
2354
2355         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2356                                     FILE_WRITE_ATTRIBUTES);
2357         /* resource #4: response buffer */
2358         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2359         if (rc) {
2360                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2361                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2362                                            CREATE_NOT_FILE,
2363                                            FILE_WRITE_ATTRIBUTES, rc);
2364                 goto err_free_rsp_buf;
2365         }
2366
2367         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2368         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2369                                     ses->Suid, CREATE_NOT_FILE,
2370                                     FILE_WRITE_ATTRIBUTES);
2371
2372         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2373
2374         /* Eventually save off posix specific response info and timestaps */
2375
2376 err_free_rsp_buf:
2377         free_rsp_buf(resp_buftype, rsp);
2378         kfree(pc_buf);
2379 err_free_req:
2380         cifs_small_buf_release(req);
2381 err_free_path:
2382         kfree(utf16_path);
2383         return rc;
2384 }
2385
2386 int
2387 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2388                struct cifs_open_parms *oparms, __le16 *path)
2389 {
2390         struct TCP_Server_Info *server = tcon->ses->server;
2391         struct smb2_create_req *req;
2392         unsigned int n_iov = 2;
2393         __u32 file_attributes = 0;
2394         int copy_size;
2395         int uni_path_len;
2396         unsigned int total_len;
2397         struct kvec *iov = rqst->rq_iov;
2398         __le16 *copy_path;
2399         int rc;
2400
2401         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2402         if (rc)
2403                 return rc;
2404
2405         iov[0].iov_base = (char *)req;
2406         /* -1 since last byte is buf[0] which is sent below (path) */
2407         iov[0].iov_len = total_len - 1;
2408
2409         if (oparms->create_options & CREATE_OPTION_READONLY)
2410                 file_attributes |= ATTR_READONLY;
2411         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2412                 file_attributes |= ATTR_SYSTEM;
2413
2414         req->ImpersonationLevel = IL_IMPERSONATION;
2415         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2416         /* File attributes ignored on open (used in create though) */
2417         req->FileAttributes = cpu_to_le32(file_attributes);
2418         req->ShareAccess = FILE_SHARE_ALL_LE;
2419         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2420         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2421         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2422
2423         /* [MS-SMB2] 2.2.13 NameOffset:
2424          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2425          * the SMB2 header, the file name includes a prefix that will
2426          * be processed during DFS name normalization as specified in
2427          * section 3.3.5.9. Otherwise, the file name is relative to
2428          * the share that is identified by the TreeId in the SMB2
2429          * header.
2430          */
2431         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2432                 int name_len;
2433
2434                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2435                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2436                                                  &name_len,
2437                                                  tcon->treeName, path);
2438                 if (rc)
2439                         return rc;
2440                 req->NameLength = cpu_to_le16(name_len * 2);
2441                 uni_path_len = copy_size;
2442                 path = copy_path;
2443         } else {
2444                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2445                 /* MUST set path len (NameLength) to 0 opening root of share */
2446                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2447                 copy_size = uni_path_len;
2448                 if (copy_size % 8 != 0)
2449                         copy_size = roundup(copy_size, 8);
2450                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2451                 if (!copy_path)
2452                         return -ENOMEM;
2453                 memcpy((char *)copy_path, (const char *)path,
2454                        uni_path_len);
2455                 uni_path_len = copy_size;
2456                 path = copy_path;
2457         }
2458
2459         iov[1].iov_len = uni_path_len;
2460         iov[1].iov_base = path;
2461
2462         if ((!server->oplocks) || (tcon->no_lease))
2463                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2464
2465         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2466             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2467                 req->RequestedOplockLevel = *oplock;
2468         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2469                   (oparms->create_options & CREATE_NOT_FILE))
2470                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2471         else {
2472                 rc = add_lease_context(server, iov, &n_iov,
2473                                        oparms->fid->lease_key, oplock);
2474                 if (rc)
2475                         return rc;
2476         }
2477
2478         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2479                 /* need to set Next field of lease context if we request it */
2480                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2481                         struct create_context *ccontext =
2482                             (struct create_context *)iov[n_iov-1].iov_base;
2483                         ccontext->Next =
2484                                 cpu_to_le32(server->vals->create_lease_size);
2485                 }
2486
2487                 rc = add_durable_context(iov, &n_iov, oparms,
2488                                         tcon->use_persistent);
2489                 if (rc)
2490                         return rc;
2491         }
2492
2493         if (tcon->posix_extensions) {
2494                 if (n_iov > 2) {
2495                         struct create_context *ccontext =
2496                             (struct create_context *)iov[n_iov-1].iov_base;
2497                         ccontext->Next =
2498                                 cpu_to_le32(iov[n_iov-1].iov_len);
2499                 }
2500
2501                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2502                 if (rc)
2503                         return rc;
2504         }
2505
2506         if (tcon->snapshot_time) {
2507                 cifs_dbg(FYI, "adding snapshot context\n");
2508                 if (n_iov > 2) {
2509                         struct create_context *ccontext =
2510                             (struct create_context *)iov[n_iov-1].iov_base;
2511                         ccontext->Next =
2512                                 cpu_to_le32(iov[n_iov-1].iov_len);
2513                 }
2514
2515                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2516                 if (rc)
2517                         return rc;
2518         }
2519
2520         if (n_iov > 2) {
2521                 struct create_context *ccontext =
2522                         (struct create_context *)iov[n_iov-1].iov_base;
2523                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2524         }
2525         add_query_id_context(iov, &n_iov);
2526
2527         rqst->rq_nvec = n_iov;
2528         return 0;
2529 }
2530
2531 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2532  * All other vectors are freed by kfree().
2533  */
2534 void
2535 SMB2_open_free(struct smb_rqst *rqst)
2536 {
2537         int i;
2538
2539         if (rqst && rqst->rq_iov) {
2540                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2541                 for (i = 1; i < rqst->rq_nvec; i++)
2542                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2543                                 kfree(rqst->rq_iov[i].iov_base);
2544         }
2545 }
2546
2547 int
2548 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2549           __u8 *oplock, struct smb2_file_all_info *buf,
2550           struct kvec *err_iov, int *buftype)
2551 {
2552         struct smb_rqst rqst;
2553         struct smb2_create_rsp *rsp = NULL;
2554         struct TCP_Server_Info *server;
2555         struct cifs_tcon *tcon = oparms->tcon;
2556         struct cifs_ses *ses = tcon->ses;
2557         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2558         struct kvec rsp_iov = {NULL, 0};
2559         int resp_buftype = CIFS_NO_BUFFER;
2560         int rc = 0;
2561         int flags = 0;
2562
2563         cifs_dbg(FYI, "create/open\n");
2564         if (ses && (ses->server))
2565                 server = ses->server;
2566         else
2567                 return -EIO;
2568
2569         if (smb3_encryption_required(tcon))
2570                 flags |= CIFS_TRANSFORM_REQ;
2571
2572         memset(&rqst, 0, sizeof(struct smb_rqst));
2573         memset(&iov, 0, sizeof(iov));
2574         rqst.rq_iov = iov;
2575         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2576
2577         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2578         if (rc)
2579                 goto creat_exit;
2580
2581         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2582                 oparms->create_options, oparms->desired_access);
2583
2584         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2585                             &rsp_iov);
2586         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2587
2588         if (rc != 0) {
2589                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2590                 if (err_iov && rsp) {
2591                         *err_iov = rsp_iov;
2592                         *buftype = resp_buftype;
2593                         resp_buftype = CIFS_NO_BUFFER;
2594                         rsp = NULL;
2595                 }
2596                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2597                                     oparms->create_options, oparms->desired_access, rc);
2598                 if (rc == -EREMCHG) {
2599                         printk_once(KERN_WARNING "server share %s deleted\n",
2600                                     tcon->treeName);
2601                         tcon->need_reconnect = true;
2602                 }
2603                 goto creat_exit;
2604         } else
2605                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2606                                      ses->Suid, oparms->create_options,
2607                                      oparms->desired_access);
2608
2609         atomic_inc(&tcon->num_remote_opens);
2610         oparms->fid->persistent_fid = rsp->PersistentFileId;
2611         oparms->fid->volatile_fid = rsp->VolatileFileId;
2612 #ifdef CONFIG_CIFS_DEBUG2
2613         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2614 #endif /* CIFS_DEBUG2 */
2615
2616         if (buf) {
2617                 memcpy(buf, &rsp->CreationTime, 32);
2618                 buf->AllocationSize = rsp->AllocationSize;
2619                 buf->EndOfFile = rsp->EndofFile;
2620                 buf->Attributes = rsp->FileAttributes;
2621                 buf->NumberOfLinks = cpu_to_le32(1);
2622                 buf->DeletePending = 0;
2623         }
2624
2625
2626         smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
2627                             oparms->fid->lease_key, oplock, buf);
2628 creat_exit:
2629         SMB2_open_free(&rqst);
2630         free_rsp_buf(resp_buftype, rsp);
2631         return rc;
2632 }
2633
2634 int
2635 SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2636                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2637                 bool is_fsctl, char *in_data, u32 indatalen,
2638                 __u32 max_response_size)
2639 {
2640         struct smb2_ioctl_req *req;
2641         struct kvec *iov = rqst->rq_iov;
2642         unsigned int total_len;
2643         int rc;
2644         char *in_data_buf;
2645
2646         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2647         if (rc)
2648                 return rc;
2649
2650         if (indatalen) {
2651                 /*
2652                  * indatalen is usually small at a couple of bytes max, so
2653                  * just allocate through generic pool
2654                  */
2655                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
2656                 if (!in_data_buf) {
2657                         cifs_small_buf_release(req);
2658                         return -ENOMEM;
2659                 }
2660         }
2661
2662         req->CtlCode = cpu_to_le32(opcode);
2663         req->PersistentFileId = persistent_fid;
2664         req->VolatileFileId = volatile_fid;
2665
2666         iov[0].iov_base = (char *)req;
2667         /*
2668          * If no input data, the size of ioctl struct in
2669          * protocol spec still includes a 1 byte data buffer,
2670          * but if input data passed to ioctl, we do not
2671          * want to double count this, so we do not send
2672          * the dummy one byte of data in iovec[0] if sending
2673          * input data (in iovec[1]).
2674          */
2675         if (indatalen) {
2676                 req->InputCount = cpu_to_le32(indatalen);
2677                 /* do not set InputOffset if no input data */
2678                 req->InputOffset =
2679                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2680                 rqst->rq_nvec = 2;
2681                 iov[0].iov_len = total_len - 1;
2682                 iov[1].iov_base = in_data_buf;
2683                 iov[1].iov_len = indatalen;
2684         } else {
2685                 rqst->rq_nvec = 1;
2686                 iov[0].iov_len = total_len;
2687         }
2688
2689         req->OutputOffset = 0;
2690         req->OutputCount = 0; /* MBZ */
2691
2692         /*
2693          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
2694          * We Could increase default MaxOutputResponse, but that could require
2695          * more credits. Windows typically sets this smaller, but for some
2696          * ioctls it may be useful to allow server to send more. No point
2697          * limiting what the server can send as long as fits in one credit
2698          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
2699          * to increase this limit up in the future.
2700          * Note that for snapshot queries that servers like Azure expect that
2701          * the first query be minimal size (and just used to get the number/size
2702          * of previous versions) so response size must be specified as EXACTLY
2703          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2704          * of eight bytes.  Currently that is the only case where we set max
2705          * response size smaller.
2706          */
2707         req->MaxOutputResponse = cpu_to_le32(max_response_size);
2708
2709         if (is_fsctl)
2710                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2711         else
2712                 req->Flags = 0;
2713
2714         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2715         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2716                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2717
2718         return 0;
2719 }
2720
2721 void
2722 SMB2_ioctl_free(struct smb_rqst *rqst)
2723 {
2724         int i;
2725         if (rqst && rqst->rq_iov) {
2726                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2727                 for (i = 1; i < rqst->rq_nvec; i++)
2728                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2729                                 kfree(rqst->rq_iov[i].iov_base);
2730         }
2731 }
2732
2733
2734 /*
2735  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2736  */
2737 int
2738 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2739            u64 volatile_fid, u32 opcode, bool is_fsctl,
2740            char *in_data, u32 indatalen, u32 max_out_data_len,
2741            char **out_data, u32 *plen /* returned data len */)
2742 {
2743         struct smb_rqst rqst;
2744         struct smb2_ioctl_rsp *rsp = NULL;
2745         struct cifs_ses *ses;
2746         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
2747         struct kvec rsp_iov = {NULL, 0};
2748         int resp_buftype = CIFS_NO_BUFFER;
2749         int rc = 0;
2750         int flags = 0;
2751         struct TCP_Server_Info *server;
2752
2753         cifs_dbg(FYI, "SMB2 IOCTL\n");
2754
2755         if (out_data != NULL)
2756                 *out_data = NULL;
2757
2758         /* zero out returned data len, in case of error */
2759         if (plen)
2760                 *plen = 0;
2761
2762         if (tcon)
2763                 ses = tcon->ses;
2764         else
2765                 return -EIO;
2766
2767         if (!ses)
2768                 return -EIO;
2769         server = ses->server;
2770         if (!server)
2771                 return -EIO;
2772
2773         if (smb3_encryption_required(tcon))
2774                 flags |= CIFS_TRANSFORM_REQ;
2775
2776         memset(&rqst, 0, sizeof(struct smb_rqst));
2777         memset(&iov, 0, sizeof(iov));
2778         rqst.rq_iov = iov;
2779         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
2780
2781         rc = SMB2_ioctl_init(tcon, &rqst, persistent_fid, volatile_fid, opcode,
2782                              is_fsctl, in_data, indatalen, max_out_data_len);
2783         if (rc)
2784                 goto ioctl_exit;
2785
2786         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2787                             &rsp_iov);
2788         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2789
2790         if (rc != 0)
2791                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2792                                 ses->Suid, 0, opcode, rc);
2793
2794         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
2795                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2796                 goto ioctl_exit;
2797         } else if (rc == -EINVAL) {
2798                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2799                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2800                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2801                         goto ioctl_exit;
2802                 }
2803         } else if (rc == -E2BIG) {
2804                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
2805                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2806                         goto ioctl_exit;
2807                 }
2808         }
2809
2810         /* check if caller wants to look at return data or just return rc */
2811         if ((plen == NULL) || (out_data == NULL))
2812                 goto ioctl_exit;
2813
2814         *plen = le32_to_cpu(rsp->OutputCount);
2815
2816         /* We check for obvious errors in the output buffer length and offset */
2817         if (*plen == 0)
2818                 goto ioctl_exit; /* server returned no data */
2819         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
2820                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2821                 *plen = 0;
2822                 rc = -EIO;
2823                 goto ioctl_exit;
2824         }
2825
2826         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
2827                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2828                         le32_to_cpu(rsp->OutputOffset));
2829                 *plen = 0;
2830                 rc = -EIO;
2831                 goto ioctl_exit;
2832         }
2833
2834         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
2835                             *plen, GFP_KERNEL);
2836         if (*out_data == NULL) {
2837                 rc = -ENOMEM;
2838                 goto ioctl_exit;
2839         }
2840
2841 ioctl_exit:
2842         SMB2_ioctl_free(&rqst);
2843         free_rsp_buf(resp_buftype, rsp);
2844         return rc;
2845 }
2846
2847 /*
2848  *   Individual callers to ioctl worker function follow
2849  */
2850
2851 int
2852 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2853                      u64 persistent_fid, u64 volatile_fid)
2854 {
2855         int rc;
2856         struct  compress_ioctl fsctl_input;
2857         char *ret_data = NULL;
2858
2859         fsctl_input.CompressionState =
2860                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2861
2862         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2863                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2864                         (char *)&fsctl_input /* data input */,
2865                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
2866                         &ret_data /* out data */, NULL);
2867
2868         cifs_dbg(FYI, "set compression rc %d\n", rc);
2869
2870         return rc;
2871 }
2872
2873 int
2874 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2875                 u64 persistent_fid, u64 volatile_fid)
2876 {
2877         struct smb2_close_req *req;
2878         struct kvec *iov = rqst->rq_iov;
2879         unsigned int total_len;
2880         int rc;
2881
2882         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2883         if (rc)
2884                 return rc;
2885
2886         req->PersistentFileId = persistent_fid;
2887         req->VolatileFileId = volatile_fid;
2888         iov[0].iov_base = (char *)req;
2889         iov[0].iov_len = total_len;
2890
2891         return 0;
2892 }
2893
2894 void
2895 SMB2_close_free(struct smb_rqst *rqst)
2896 {
2897         if (rqst && rqst->rq_iov)
2898                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2899 }
2900
2901 int
2902 SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2903                  u64 persistent_fid, u64 volatile_fid, int flags)
2904 {
2905         struct smb_rqst rqst;
2906         struct smb2_close_rsp *rsp = NULL;
2907         struct cifs_ses *ses = tcon->ses;
2908         struct kvec iov[1];
2909         struct kvec rsp_iov;
2910         int resp_buftype = CIFS_NO_BUFFER;
2911         int rc = 0;
2912
2913         cifs_dbg(FYI, "Close\n");
2914
2915         if (!ses || !(ses->server))
2916                 return -EIO;
2917
2918         if (smb3_encryption_required(tcon))
2919                 flags |= CIFS_TRANSFORM_REQ;
2920
2921         memset(&rqst, 0, sizeof(struct smb_rqst));
2922         memset(&iov, 0, sizeof(iov));
2923         rqst.rq_iov = iov;
2924         rqst.rq_nvec = 1;
2925
2926         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
2927         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
2928         if (rc)
2929                 goto close_exit;
2930
2931         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2932         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2933
2934         if (rc != 0) {
2935                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2936                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2937                                      rc);
2938                 goto close_exit;
2939         } else
2940                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
2941                                       ses->Suid);
2942
2943         atomic_dec(&tcon->num_remote_opens);
2944
2945         /* BB FIXME - decode close response, update inode for caching */
2946
2947 close_exit:
2948         SMB2_close_free(&rqst);
2949         free_rsp_buf(resp_buftype, rsp);
2950         return rc;
2951 }
2952
2953 int
2954 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2955            u64 persistent_fid, u64 volatile_fid)
2956 {
2957         return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2958 }
2959
2960 int
2961 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
2962                   struct kvec *iov, unsigned int min_buf_size)
2963 {
2964         unsigned int smb_len = iov->iov_len;
2965         char *end_of_smb = smb_len + (char *)iov->iov_base;
2966         char *begin_of_buf = offset + (char *)iov->iov_base;
2967         char *end_of_buf = begin_of_buf + buffer_length;
2968
2969
2970         if (buffer_length < min_buf_size) {
2971                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2972                          buffer_length, min_buf_size);
2973                 return -EINVAL;
2974         }
2975
2976         /* check if beyond RFC1001 maximum length */
2977         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2978                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2979                          buffer_length, smb_len);
2980                 return -EINVAL;
2981         }
2982
2983         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2984                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2985                 return -EINVAL;
2986         }
2987
2988         return 0;
2989 }
2990
2991 /*
2992  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2993  * Caller must free buffer.
2994  */
2995 int
2996 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
2997                            struct kvec *iov, unsigned int minbufsize,
2998                            char *data)
2999 {
3000         char *begin_of_buf = offset + (char *)iov->iov_base;
3001         int rc;
3002
3003         if (!data)
3004                 return -EINVAL;
3005
3006         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3007         if (rc)
3008                 return rc;
3009
3010         memcpy(data, begin_of_buf, buffer_length);
3011
3012         return 0;
3013 }
3014
3015 int
3016 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
3017                      u64 persistent_fid, u64 volatile_fid,
3018                      u8 info_class, u8 info_type, u32 additional_info,
3019                      size_t output_len, size_t input_len, void *input)
3020 {
3021         struct smb2_query_info_req *req;
3022         struct kvec *iov = rqst->rq_iov;
3023         unsigned int total_len;
3024         int rc;
3025
3026         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
3027                              &total_len);
3028         if (rc)
3029                 return rc;
3030
3031         req->InfoType = info_type;
3032         req->FileInfoClass = info_class;
3033         req->PersistentFileId = persistent_fid;
3034         req->VolatileFileId = volatile_fid;
3035         req->AdditionalInformation = cpu_to_le32(additional_info);
3036
3037         req->OutputBufferLength = cpu_to_le32(output_len);
3038         if (input_len) {
3039                 req->InputBufferLength = cpu_to_le32(input_len);
3040                 /* total_len for smb query request never close to le16 max */
3041                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3042                 memcpy(req->Buffer, input, input_len);
3043         }
3044
3045         iov[0].iov_base = (char *)req;
3046         /* 1 for Buffer */
3047         iov[0].iov_len = total_len - 1 + input_len;
3048         return 0;
3049 }
3050
3051 void
3052 SMB2_query_info_free(struct smb_rqst *rqst)
3053 {
3054         if (rqst && rqst->rq_iov)
3055                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3056 }
3057
3058 static int
3059 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3060            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3061            u32 additional_info, size_t output_len, size_t min_len, void **data,
3062                 u32 *dlen)
3063 {
3064         struct smb_rqst rqst;
3065         struct smb2_query_info_rsp *rsp = NULL;
3066         struct kvec iov[1];
3067         struct kvec rsp_iov;
3068         int rc = 0;
3069         int resp_buftype = CIFS_NO_BUFFER;
3070         struct cifs_ses *ses = tcon->ses;
3071         struct TCP_Server_Info *server;
3072         int flags = 0;
3073         bool allocated = false;
3074
3075         cifs_dbg(FYI, "Query Info\n");
3076
3077         if (!ses)
3078                 return -EIO;
3079         server = ses->server;
3080         if (!server)
3081                 return -EIO;
3082
3083         if (smb3_encryption_required(tcon))
3084                 flags |= CIFS_TRANSFORM_REQ;
3085
3086         memset(&rqst, 0, sizeof(struct smb_rqst));
3087         memset(&iov, 0, sizeof(iov));
3088         rqst.rq_iov = iov;
3089         rqst.rq_nvec = 1;
3090
3091         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
3092                                   info_class, info_type, additional_info,
3093                                   output_len, 0, NULL);
3094         if (rc)
3095                 goto qinf_exit;
3096
3097         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3098                                     ses->Suid, info_class, (__u32)info_type);
3099
3100         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3101         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3102
3103         if (rc) {
3104                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3105                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3106                                 ses->Suid, info_class, (__u32)info_type, rc);
3107                 goto qinf_exit;
3108         }
3109
3110         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3111                                 ses->Suid, info_class, (__u32)info_type);
3112
3113         if (dlen) {
3114                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3115                 if (!*data) {
3116                         *data = kmalloc(*dlen, GFP_KERNEL);
3117                         if (!*data) {
3118                                 cifs_tcon_dbg(VFS,
3119                                         "Error %d allocating memory for acl\n",
3120                                         rc);
3121                                 *dlen = 0;
3122                                 rc = -ENOMEM;
3123                                 goto qinf_exit;
3124                         }
3125                         allocated = true;
3126                 }
3127         }
3128
3129         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3130                                         le32_to_cpu(rsp->OutputBufferLength),
3131                                         &rsp_iov, min_len, *data);
3132         if (rc && allocated) {
3133                 kfree(*data);
3134                 *data = NULL;
3135                 *dlen = 0;
3136         }
3137
3138 qinf_exit:
3139         SMB2_query_info_free(&rqst);
3140         free_rsp_buf(resp_buftype, rsp);
3141         return rc;
3142 }
3143
3144 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3145         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3146 {
3147         return query_info(xid, tcon, persistent_fid, volatile_fid,
3148                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3149                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3150                           sizeof(struct smb2_file_all_info), (void **)&data,
3151                           NULL);
3152 }
3153
3154 int
3155 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3156                 u64 persistent_fid, u64 volatile_fid,
3157                 void **data, u32 *plen)
3158 {
3159         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
3160         *plen = 0;
3161
3162         return query_info(xid, tcon, persistent_fid, volatile_fid,
3163                           0, SMB2_O_INFO_SECURITY, additional_info,
3164                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3165 }
3166
3167 int
3168 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3169                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3170 {
3171         return query_info(xid, tcon, persistent_fid, volatile_fid,
3172                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3173                           sizeof(struct smb2_file_internal_info),
3174                           sizeof(struct smb2_file_internal_info),
3175                           (void **)&uniqueid, NULL);
3176 }
3177
3178 /*
3179  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3180  * See MS-SMB2 2.2.35 and 2.2.36
3181  */
3182
3183 int
3184 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3185                 struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid,
3186                 u32 completion_filter, bool watch_tree)
3187 {
3188         struct smb2_change_notify_req *req;
3189         struct kvec *iov = rqst->rq_iov;
3190         unsigned int total_len;
3191         int rc;
3192
3193         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, (void **) &req, &total_len);
3194         if (rc)
3195                 return rc;
3196
3197         req->PersistentFileId = persistent_fid;
3198         req->VolatileFileId = volatile_fid;
3199         req->OutputBufferLength = SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE;
3200         req->CompletionFilter = cpu_to_le32(completion_filter);
3201         if (watch_tree)
3202                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3203         else
3204                 req->Flags = 0;
3205
3206         iov[0].iov_base = (char *)req;
3207         iov[0].iov_len = total_len;
3208
3209         return 0;
3210 }
3211
3212 int
3213 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3214                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3215                 u32 completion_filter)
3216 {
3217         struct cifs_ses *ses = tcon->ses;
3218         struct smb_rqst rqst;
3219         struct kvec iov[1];
3220         struct kvec rsp_iov = {NULL, 0};
3221         int resp_buftype = CIFS_NO_BUFFER;
3222         int flags = 0;
3223         int rc = 0;
3224
3225         cifs_dbg(FYI, "change notify\n");
3226         if (!ses || !(ses->server))
3227                 return -EIO;
3228
3229         if (smb3_encryption_required(tcon))
3230                 flags |= CIFS_TRANSFORM_REQ;
3231
3232         memset(&rqst, 0, sizeof(struct smb_rqst));
3233         memset(&iov, 0, sizeof(iov));
3234         rqst.rq_iov = iov;
3235         rqst.rq_nvec = 1;
3236
3237         rc = SMB2_notify_init(xid, &rqst, tcon, persistent_fid, volatile_fid,
3238                               completion_filter, watch_tree);
3239         if (rc)
3240                 goto cnotify_exit;
3241
3242         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3243                                 (u8)watch_tree, completion_filter);
3244         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3245
3246         if (rc != 0) {
3247                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3248                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3249                                 (u8)watch_tree, completion_filter, rc);
3250         } else
3251                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3252                                 ses->Suid, (u8)watch_tree, completion_filter);
3253
3254  cnotify_exit:
3255         if (rqst.rq_iov)
3256                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3257         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3258         return rc;
3259 }
3260
3261
3262
3263 /*
3264  * This is a no-op for now. We're not really interested in the reply, but
3265  * rather in the fact that the server sent one and that server->lstrp
3266  * gets updated.
3267  *
3268  * FIXME: maybe we should consider checking that the reply matches request?
3269  */
3270 static void
3271 smb2_echo_callback(struct mid_q_entry *mid)
3272 {
3273         struct TCP_Server_Info *server = mid->callback_data;
3274         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3275         struct cifs_credits credits = { .value = 0, .instance = 0 };
3276
3277         if (mid->mid_state == MID_RESPONSE_RECEIVED
3278             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3279                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3280                 credits.instance = server->reconnect_instance;
3281         }
3282
3283         DeleteMidQEntry(mid);
3284         add_credits(server, &credits, CIFS_ECHO_OP);
3285 }
3286
3287 void smb2_reconnect_server(struct work_struct *work)
3288 {
3289         struct TCP_Server_Info *server = container_of(work,
3290                                         struct TCP_Server_Info, reconnect.work);
3291         struct cifs_ses *ses;
3292         struct cifs_tcon *tcon, *tcon2;
3293         struct list_head tmp_list;
3294         int tcon_exist = false;
3295         int rc;
3296         int resched = false;
3297
3298
3299         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3300         mutex_lock(&server->reconnect_mutex);
3301
3302         INIT_LIST_HEAD(&tmp_list);
3303         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3304
3305         spin_lock(&cifs_tcp_ses_lock);
3306         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3307                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3308                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3309                                 tcon->tc_count++;
3310                                 list_add_tail(&tcon->rlist, &tmp_list);
3311                                 tcon_exist = true;
3312                         }
3313                 }
3314                 /*
3315                  * IPC has the same lifetime as its session and uses its
3316                  * refcount.
3317                  */
3318                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3319                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3320                         tcon_exist = true;
3321                         ses->ses_count++;
3322                 }
3323         }
3324         /*
3325          * Get the reference to server struct to be sure that the last call of
3326          * cifs_put_tcon() in the loop below won't release the server pointer.
3327          */
3328         if (tcon_exist)
3329                 server->srv_count++;
3330
3331         spin_unlock(&cifs_tcp_ses_lock);
3332
3333         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3334                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
3335                 if (!rc)
3336                         cifs_reopen_persistent_handles(tcon);
3337                 else
3338                         resched = true;
3339                 list_del_init(&tcon->rlist);
3340                 if (tcon->ipc)
3341                         cifs_put_smb_ses(tcon->ses);
3342                 else
3343                         cifs_put_tcon(tcon);
3344         }
3345
3346         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3347         if (resched)
3348                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3349         mutex_unlock(&server->reconnect_mutex);
3350
3351         /* now we can safely release srv struct */
3352         if (tcon_exist)
3353                 cifs_put_tcp_session(server, 1);
3354 }
3355
3356 int
3357 SMB2_echo(struct TCP_Server_Info *server)
3358 {
3359         struct smb2_echo_req *req;
3360         int rc = 0;
3361         struct kvec iov[1];
3362         struct smb_rqst rqst = { .rq_iov = iov,
3363                                  .rq_nvec = 1 };
3364         unsigned int total_len;
3365
3366         cifs_dbg(FYI, "In echo request\n");
3367
3368         if (server->tcpStatus == CifsNeedNegotiate) {
3369                 /* No need to send echo on newly established connections */
3370                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
3371                 return rc;
3372         }
3373
3374         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
3375         if (rc)
3376                 return rc;
3377
3378         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3379
3380         iov[0].iov_len = total_len;
3381         iov[0].iov_base = (char *)req;
3382
3383         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3384                              server, CIFS_ECHO_OP, NULL);
3385         if (rc)
3386                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3387
3388         cifs_small_buf_release(req);
3389         return rc;
3390 }
3391
3392 void
3393 SMB2_flush_free(struct smb_rqst *rqst)
3394 {
3395         if (rqst && rqst->rq_iov)
3396                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3397 }
3398
3399 int
3400 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3401                 struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid)
3402 {
3403         struct smb2_flush_req *req;
3404         struct kvec *iov = rqst->rq_iov;
3405         unsigned int total_len;
3406         int rc;
3407
3408         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
3409         if (rc)
3410                 return rc;
3411
3412         req->PersistentFileId = persistent_fid;
3413         req->VolatileFileId = volatile_fid;
3414
3415         iov[0].iov_base = (char *)req;
3416         iov[0].iov_len = total_len;
3417
3418         return 0;
3419 }
3420
3421 int
3422 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3423            u64 volatile_fid)
3424 {
3425         struct cifs_ses *ses = tcon->ses;
3426         struct smb_rqst rqst;
3427         struct kvec iov[1];
3428         struct kvec rsp_iov = {NULL, 0};
3429         int resp_buftype = CIFS_NO_BUFFER;
3430         int flags = 0;
3431         int rc = 0;
3432
3433         cifs_dbg(FYI, "flush\n");
3434         if (!ses || !(ses->server))
3435                 return -EIO;
3436
3437         if (smb3_encryption_required(tcon))
3438                 flags |= CIFS_TRANSFORM_REQ;
3439
3440         memset(&rqst, 0, sizeof(struct smb_rqst));
3441         memset(&iov, 0, sizeof(iov));
3442         rqst.rq_iov = iov;
3443         rqst.rq_nvec = 1;
3444
3445         rc = SMB2_flush_init(xid, &rqst, tcon, persistent_fid, volatile_fid);
3446         if (rc)
3447                 goto flush_exit;
3448
3449         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3450         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3451
3452         if (rc != 0) {
3453                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3454                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3455                                      rc);
3456         } else
3457                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
3458                                       ses->Suid);
3459
3460  flush_exit:
3461         SMB2_flush_free(&rqst);
3462         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3463         return rc;
3464 }
3465
3466 /*
3467  * To form a chain of read requests, any read requests after the first should
3468  * have the end_of_chain boolean set to true.
3469  */
3470 static int
3471 smb2_new_read_req(void **buf, unsigned int *total_len,
3472         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3473         unsigned int remaining_bytes, int request_type)
3474 {
3475         int rc = -EACCES;
3476         struct smb2_read_plain_req *req = NULL;
3477         struct smb2_sync_hdr *shdr;
3478         struct TCP_Server_Info *server;
3479
3480         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
3481                                  total_len);
3482         if (rc)
3483                 return rc;
3484
3485         server = io_parms->tcon->ses->server;
3486         if (server == NULL)
3487                 return -ECONNABORTED;
3488
3489         shdr = &req->sync_hdr;
3490         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3491
3492         req->PersistentFileId = io_parms->persistent_fid;
3493         req->VolatileFileId = io_parms->volatile_fid;
3494         req->ReadChannelInfoOffset = 0; /* reserved */
3495         req->ReadChannelInfoLength = 0; /* reserved */
3496         req->Channel = 0; /* reserved */
3497         req->MinimumCount = 0;
3498         req->Length = cpu_to_le32(io_parms->length);
3499         req->Offset = cpu_to_le64(io_parms->offset);
3500
3501         trace_smb3_read_enter(0 /* xid */,
3502                         io_parms->persistent_fid,
3503                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3504                         io_parms->offset, io_parms->length);
3505 #ifdef CONFIG_CIFS_SMB_DIRECT
3506         /*
3507          * If we want to do a RDMA write, fill in and append
3508          * smbd_buffer_descriptor_v1 to the end of read request
3509          */
3510         if (server->rdma && rdata && !server->sign &&
3511                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3512
3513                 struct smbd_buffer_descriptor_v1 *v1;
3514                 bool need_invalidate =
3515                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3516
3517                 rdata->mr = smbd_register_mr(
3518                                 server->smbd_conn, rdata->pages,
3519                                 rdata->nr_pages, rdata->page_offset,
3520                                 rdata->tailsz, true, need_invalidate);
3521                 if (!rdata->mr)
3522                         return -EAGAIN;
3523
3524                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3525                 if (need_invalidate)
3526                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3527                 req->ReadChannelInfoOffset =
3528                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3529                 req->ReadChannelInfoLength =
3530                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3531                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3532                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3533                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3534                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3535
3536                 *total_len += sizeof(*v1) - 1;
3537         }
3538 #endif
3539         if (request_type & CHAINED_REQUEST) {
3540                 if (!(request_type & END_OF_CHAIN)) {
3541                         /* next 8-byte aligned request */
3542                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3543                         shdr->NextCommand = cpu_to_le32(*total_len);
3544                 } else /* END_OF_CHAIN */
3545                         shdr->NextCommand = 0;
3546                 if (request_type & RELATED_REQUEST) {
3547                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3548                         /*
3549                          * Related requests use info from previous read request
3550                          * in chain.
3551                          */
3552                         shdr->SessionId = 0xFFFFFFFF;
3553                         shdr->TreeId = 0xFFFFFFFF;
3554                         req->PersistentFileId = 0xFFFFFFFF;
3555                         req->VolatileFileId = 0xFFFFFFFF;
3556                 }
3557         }
3558         if (remaining_bytes > io_parms->length)
3559                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3560         else
3561                 req->RemainingBytes = 0;
3562
3563         *buf = req;
3564         return rc;
3565 }
3566
3567 static void
3568 smb2_readv_callback(struct mid_q_entry *mid)
3569 {
3570         struct cifs_readdata *rdata = mid->callback_data;
3571         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3572         struct TCP_Server_Info *server = tcon->ses->server;
3573         struct smb2_sync_hdr *shdr =
3574                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3575         struct cifs_credits credits = { .value = 0, .instance = 0 };
3576         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
3577                                  .rq_nvec = 1,
3578                                  .rq_pages = rdata->pages,
3579                                  .rq_offset = rdata->page_offset,
3580                                  .rq_npages = rdata->nr_pages,
3581                                  .rq_pagesz = rdata->pagesz,
3582                                  .rq_tailsz = rdata->tailsz };
3583
3584         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3585                  __func__, mid->mid, mid->mid_state, rdata->result,
3586                  rdata->bytes);
3587
3588         switch (mid->mid_state) {
3589         case MID_RESPONSE_RECEIVED:
3590                 credits.value = le16_to_cpu(shdr->CreditRequest);
3591                 credits.instance = server->reconnect_instance;
3592                 /* result already set, check signature */
3593                 if (server->sign && !mid->decrypted) {
3594                         int rc;
3595
3596                         rc = smb2_verify_signature(&rqst, server);
3597                         if (rc)
3598                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
3599                                          rc);
3600                 }
3601                 /* FIXME: should this be counted toward the initiating task? */
3602                 task_io_account_read(rdata->got_bytes);
3603                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3604                 break;
3605         case MID_REQUEST_SUBMITTED:
3606         case MID_RETRY_NEEDED:
3607                 rdata->result = -EAGAIN;
3608                 if (server->sign && rdata->got_bytes)
3609                         /* reset bytes number since we can not check a sign */
3610                         rdata->got_bytes = 0;
3611                 /* FIXME: should this be counted toward the initiating task? */
3612                 task_io_account_read(rdata->got_bytes);
3613                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3614                 break;
3615         case MID_RESPONSE_MALFORMED:
3616                 credits.value = le16_to_cpu(shdr->CreditRequest);
3617                 credits.instance = server->reconnect_instance;
3618                 /* fall through */
3619         default:
3620                 rdata->result = -EIO;
3621         }
3622 #ifdef CONFIG_CIFS_SMB_DIRECT
3623         /*
3624          * If this rdata has a memmory registered, the MR can be freed
3625          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3626          * because they have limited number and are used for future I/Os
3627          */
3628         if (rdata->mr) {
3629                 smbd_deregister_mr(rdata->mr);
3630                 rdata->mr = NULL;
3631         }
3632 #endif
3633         if (rdata->result && rdata->result != -ENODATA) {
3634                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3635                 trace_smb3_read_err(0 /* xid */,
3636                                     rdata->cfile->fid.persistent_fid,
3637                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3638                                     rdata->bytes, rdata->result);
3639         } else
3640                 trace_smb3_read_done(0 /* xid */,
3641                                      rdata->cfile->fid.persistent_fid,
3642                                      tcon->tid, tcon->ses->Suid,
3643                                      rdata->offset, rdata->got_bytes);
3644
3645         queue_work(cifsiod_wq, &rdata->work);
3646         DeleteMidQEntry(mid);
3647         add_credits(server, &credits, 0);
3648 }
3649
3650 /* smb2_async_readv - send an async read, and set up mid to handle result */
3651 int
3652 smb2_async_readv(struct cifs_readdata *rdata)
3653 {
3654         int rc, flags = 0;
3655         char *buf;
3656         struct smb2_sync_hdr *shdr;
3657         struct cifs_io_parms io_parms;
3658         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3659                                  .rq_nvec = 1 };
3660         struct TCP_Server_Info *server;
3661         unsigned int total_len;
3662
3663         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3664                  __func__, rdata->offset, rdata->bytes);
3665
3666         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3667         io_parms.offset = rdata->offset;
3668         io_parms.length = rdata->bytes;
3669         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3670         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3671         io_parms.pid = rdata->pid;
3672
3673         server = io_parms.tcon->ses->server;
3674
3675         rc = smb2_new_read_req(
3676                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3677         if (rc)
3678                 return rc;
3679
3680         if (smb3_encryption_required(io_parms.tcon))
3681                 flags |= CIFS_TRANSFORM_REQ;
3682
3683         rdata->iov[0].iov_base = buf;
3684         rdata->iov[0].iov_len = total_len;
3685
3686         shdr = (struct smb2_sync_hdr *)buf;
3687
3688         if (rdata->credits.value > 0) {
3689                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3690                                                 SMB2_MAX_BUFFER_SIZE));
3691                 shdr->CreditRequest =
3692                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3693
3694                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
3695                 if (rc)
3696                         goto async_readv_out;
3697
3698                 flags |= CIFS_HAS_CREDITS;
3699         }
3700
3701         kref_get(&rdata->refcount);
3702         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3703                              cifs_readv_receive, smb2_readv_callback,
3704                              smb3_handle_read_data, rdata, flags,
3705                              &rdata->credits);
3706         if (rc) {
3707                 kref_put(&rdata->refcount, cifs_readdata_release);
3708                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3709                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
3710                                     io_parms.tcon->tid,
3711                                     io_parms.tcon->ses->Suid,
3712                                     io_parms.offset, io_parms.length, rc);
3713         }
3714
3715 async_readv_out:
3716         cifs_small_buf_release(buf);
3717         return rc;
3718 }
3719
3720 int
3721 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3722           unsigned int *nbytes, char **buf, int *buf_type)
3723 {
3724         struct smb_rqst rqst;
3725         int resp_buftype, rc;
3726         struct smb2_read_plain_req *req = NULL;
3727         struct smb2_read_rsp *rsp = NULL;
3728         struct kvec iov[1];
3729         struct kvec rsp_iov;
3730         unsigned int total_len;
3731         int flags = CIFS_LOG_ERROR;
3732         struct cifs_ses *ses = io_parms->tcon->ses;
3733
3734         *nbytes = 0;
3735         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3736         if (rc)
3737                 return rc;
3738
3739         if (smb3_encryption_required(io_parms->tcon))
3740                 flags |= CIFS_TRANSFORM_REQ;
3741
3742         iov[0].iov_base = (char *)req;
3743         iov[0].iov_len = total_len;
3744
3745         memset(&rqst, 0, sizeof(struct smb_rqst));
3746         rqst.rq_iov = iov;
3747         rqst.rq_nvec = 1;
3748
3749         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3750         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3751
3752         if (rc) {
3753                 if (rc != -ENODATA) {
3754                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3755                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3756                         trace_smb3_read_err(xid, req->PersistentFileId,
3757                                             io_parms->tcon->tid, ses->Suid,
3758                                             io_parms->offset, io_parms->length,
3759                                             rc);
3760                 } else
3761                         trace_smb3_read_done(xid, req->PersistentFileId,
3762                                     io_parms->tcon->tid, ses->Suid,
3763                                     io_parms->offset, 0);
3764                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3765                 cifs_small_buf_release(req);
3766                 return rc == -ENODATA ? 0 : rc;
3767         } else
3768                 trace_smb3_read_done(xid, req->PersistentFileId,
3769                                     io_parms->tcon->tid, ses->Suid,
3770                                     io_parms->offset, io_parms->length);
3771
3772         cifs_small_buf_release(req);
3773
3774         *nbytes = le32_to_cpu(rsp->DataLength);
3775         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3776             (*nbytes > io_parms->length)) {
3777                 cifs_dbg(FYI, "bad length %d for count %d\n",
3778                          *nbytes, io_parms->length);
3779                 rc = -EIO;
3780                 *nbytes = 0;
3781         }
3782
3783         if (*buf) {
3784                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3785                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3786         } else if (resp_buftype != CIFS_NO_BUFFER) {
3787                 *buf = rsp_iov.iov_base;
3788                 if (resp_buftype == CIFS_SMALL_BUFFER)
3789                         *buf_type = CIFS_SMALL_BUFFER;
3790                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3791                         *buf_type = CIFS_LARGE_BUFFER;
3792         }
3793         return rc;
3794 }
3795
3796 /*
3797  * Check the mid_state and signature on received buffer (if any), and queue the
3798  * workqueue completion task.
3799  */
3800 static void
3801 smb2_writev_callback(struct mid_q_entry *mid)
3802 {
3803         struct cifs_writedata *wdata = mid->callback_data;
3804         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3805         struct TCP_Server_Info *server = tcon->ses->server;
3806         unsigned int written;
3807         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3808         struct cifs_credits credits = { .value = 0, .instance = 0 };
3809
3810         switch (mid->mid_state) {
3811         case MID_RESPONSE_RECEIVED:
3812                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3813                 credits.instance = server->reconnect_instance;
3814                 wdata->result = smb2_check_receive(mid, server, 0);
3815                 if (wdata->result != 0)
3816                         break;
3817
3818                 written = le32_to_cpu(rsp->DataLength);
3819                 /*
3820                  * Mask off high 16 bits when bytes written as returned
3821                  * by the server is greater than bytes requested by the
3822                  * client. OS/2 servers are known to set incorrect
3823                  * CountHigh values.
3824                  */
3825                 if (written > wdata->bytes)
3826                         written &= 0xFFFF;
3827
3828                 if (written < wdata->bytes)
3829                         wdata->result = -ENOSPC;
3830                 else
3831                         wdata->bytes = written;
3832                 break;
3833         case MID_REQUEST_SUBMITTED:
3834         case MID_RETRY_NEEDED:
3835                 wdata->result = -EAGAIN;
3836                 break;
3837         case MID_RESPONSE_MALFORMED:
3838                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3839                 credits.instance = server->reconnect_instance;
3840                 /* fall through */
3841         default:
3842                 wdata->result = -EIO;
3843                 break;
3844         }
3845 #ifdef CONFIG_CIFS_SMB_DIRECT
3846         /*
3847          * If this wdata has a memory registered, the MR can be freed
3848          * The number of MRs available is limited, it's important to recover
3849          * used MR as soon as I/O is finished. Hold MR longer in the later
3850          * I/O process can possibly result in I/O deadlock due to lack of MR
3851          * to send request on I/O retry
3852          */
3853         if (wdata->mr) {
3854                 smbd_deregister_mr(wdata->mr);
3855                 wdata->mr = NULL;
3856         }
3857 #endif
3858         if (wdata->result) {
3859                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3860                 trace_smb3_write_err(0 /* no xid */,
3861                                      wdata->cfile->fid.persistent_fid,
3862                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3863                                      wdata->bytes, wdata->result);
3864         } else
3865                 trace_smb3_write_done(0 /* no xid */,
3866                                       wdata->cfile->fid.persistent_fid,
3867                                       tcon->tid, tcon->ses->Suid,
3868                                       wdata->offset, wdata->bytes);
3869
3870         queue_work(cifsiod_wq, &wdata->work);
3871         DeleteMidQEntry(mid);
3872         add_credits(server, &credits, 0);
3873 }
3874
3875 /* smb2_async_writev - send an async write, and set up mid to handle result */
3876 int
3877 smb2_async_writev(struct cifs_writedata *wdata,
3878                   void (*release)(struct kref *kref))
3879 {
3880         int rc = -EACCES, flags = 0;
3881         struct smb2_write_req *req = NULL;
3882         struct smb2_sync_hdr *shdr;
3883         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3884         struct TCP_Server_Info *server = tcon->ses->server;
3885         struct kvec iov[1];
3886         struct smb_rqst rqst = { };
3887         unsigned int total_len;
3888
3889         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3890         if (rc)
3891                 return rc;
3892
3893         if (smb3_encryption_required(tcon))
3894                 flags |= CIFS_TRANSFORM_REQ;
3895
3896         shdr = (struct smb2_sync_hdr *)req;
3897         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3898
3899         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3900         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3901         req->WriteChannelInfoOffset = 0;
3902         req->WriteChannelInfoLength = 0;
3903         req->Channel = 0;
3904         req->Offset = cpu_to_le64(wdata->offset);
3905         req->DataOffset = cpu_to_le16(
3906                                 offsetof(struct smb2_write_req, Buffer));
3907         req->RemainingBytes = 0;
3908
3909         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
3910                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
3911 #ifdef CONFIG_CIFS_SMB_DIRECT
3912         /*
3913          * If we want to do a server RDMA read, fill in and append
3914          * smbd_buffer_descriptor_v1 to the end of write request
3915          */
3916         if (server->rdma && !server->sign && wdata->bytes >=
3917                 server->smbd_conn->rdma_readwrite_threshold) {
3918
3919                 struct smbd_buffer_descriptor_v1 *v1;
3920                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3921
3922                 wdata->mr = smbd_register_mr(
3923                                 server->smbd_conn, wdata->pages,
3924                                 wdata->nr_pages, wdata->page_offset,
3925                                 wdata->tailsz, false, need_invalidate);
3926                 if (!wdata->mr) {
3927                         rc = -EAGAIN;
3928                         goto async_writev_out;
3929                 }
3930                 req->Length = 0;
3931                 req->DataOffset = 0;
3932                 if (wdata->nr_pages > 1)
3933                         req->RemainingBytes =
3934                                 cpu_to_le32(
3935                                         (wdata->nr_pages - 1) * wdata->pagesz -
3936                                         wdata->page_offset + wdata->tailsz
3937                                 );
3938                 else
3939                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3940                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3941                 if (need_invalidate)
3942                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3943                 req->WriteChannelInfoOffset =
3944                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3945                 req->WriteChannelInfoLength =
3946                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3947                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3948                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3949                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3950                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3951         }
3952 #endif
3953         iov[0].iov_len = total_len - 1;
3954         iov[0].iov_base = (char *)req;
3955
3956         rqst.rq_iov = iov;
3957         rqst.rq_nvec = 1;
3958         rqst.rq_pages = wdata->pages;
3959         rqst.rq_offset = wdata->page_offset;
3960         rqst.rq_npages = wdata->nr_pages;
3961         rqst.rq_pagesz = wdata->pagesz;
3962         rqst.rq_tailsz = wdata->tailsz;
3963 #ifdef CONFIG_CIFS_SMB_DIRECT
3964         if (wdata->mr) {
3965                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3966                 rqst.rq_npages = 0;
3967         }
3968 #endif
3969         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3970                  wdata->offset, wdata->bytes);
3971
3972 #ifdef CONFIG_CIFS_SMB_DIRECT
3973         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3974         if (!wdata->mr)
3975                 req->Length = cpu_to_le32(wdata->bytes);
3976 #else
3977         req->Length = cpu_to_le32(wdata->bytes);
3978 #endif
3979
3980         if (wdata->credits.value > 0) {
3981                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3982                                                     SMB2_MAX_BUFFER_SIZE));
3983                 shdr->CreditRequest =
3984                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3985
3986                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
3987                 if (rc)
3988                         goto async_writev_out;
3989
3990                 flags |= CIFS_HAS_CREDITS;
3991         }
3992
3993         kref_get(&wdata->refcount);
3994         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3995                              wdata, flags, &wdata->credits);
3996
3997         if (rc) {
3998                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
3999                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4000                                      wdata->bytes, rc);
4001                 kref_put(&wdata->refcount, release);
4002                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4003         }
4004
4005 async_writev_out:
4006         cifs_small_buf_release(req);
4007         return rc;
4008 }
4009
4010 /*
4011  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4012  * The length field from io_parms must be at least 1 and indicates a number of
4013  * elements with data to write that begins with position 1 in iov array. All
4014  * data length is specified by count.
4015  */
4016 int
4017 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4018            unsigned int *nbytes, struct kvec *iov, int n_vec)
4019 {
4020         struct smb_rqst rqst;
4021         int rc = 0;
4022         struct smb2_write_req *req = NULL;
4023         struct smb2_write_rsp *rsp = NULL;
4024         int resp_buftype;
4025         struct kvec rsp_iov;
4026         int flags = 0;
4027         unsigned int total_len;
4028
4029         *nbytes = 0;
4030
4031         if (n_vec < 1)
4032                 return rc;
4033
4034         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
4035                              &total_len);
4036         if (rc)
4037                 return rc;
4038
4039         if (io_parms->tcon->ses->server == NULL)
4040                 return -ECONNABORTED;
4041
4042         if (smb3_encryption_required(io_parms->tcon))
4043                 flags |= CIFS_TRANSFORM_REQ;
4044
4045         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
4046
4047         req->PersistentFileId = io_parms->persistent_fid;
4048         req->VolatileFileId = io_parms->volatile_fid;
4049         req->WriteChannelInfoOffset = 0;
4050         req->WriteChannelInfoLength = 0;
4051         req->Channel = 0;
4052         req->Length = cpu_to_le32(io_parms->length);
4053         req->Offset = cpu_to_le64(io_parms->offset);
4054         req->DataOffset = cpu_to_le16(
4055                                 offsetof(struct smb2_write_req, Buffer));
4056         req->RemainingBytes = 0;
4057
4058         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4059                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4060                 io_parms->offset, io_parms->length);
4061
4062         iov[0].iov_base = (char *)req;
4063         /* 1 for Buffer */
4064         iov[0].iov_len = total_len - 1;
4065
4066         memset(&rqst, 0, sizeof(struct smb_rqst));
4067         rqst.rq_iov = iov;
4068         rqst.rq_nvec = n_vec + 1;
4069
4070         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
4071                             &resp_buftype, flags, &rsp_iov);
4072         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4073
4074         if (rc) {
4075                 trace_smb3_write_err(xid, req->PersistentFileId,
4076                                      io_parms->tcon->tid,
4077                                      io_parms->tcon->ses->Suid,
4078                                      io_parms->offset, io_parms->length, rc);
4079                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4080                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4081         } else {
4082                 *nbytes = le32_to_cpu(rsp->DataLength);
4083                 trace_smb3_write_done(xid, req->PersistentFileId,
4084                                      io_parms->tcon->tid,
4085                                      io_parms->tcon->ses->Suid,
4086                                      io_parms->offset, *nbytes);
4087         }
4088
4089         cifs_small_buf_release(req);
4090         free_rsp_buf(resp_buftype, rsp);
4091         return rc;
4092 }
4093
4094 static unsigned int
4095 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
4096 {
4097         int len;
4098         unsigned int entrycount = 0;
4099         unsigned int next_offset = 0;
4100         char *entryptr;
4101         FILE_DIRECTORY_INFO *dir_info;
4102
4103         if (bufstart == NULL)
4104                 return 0;
4105
4106         entryptr = bufstart;
4107
4108         while (1) {
4109                 if (entryptr + next_offset < entryptr ||
4110                     entryptr + next_offset > end_of_buf ||
4111                     entryptr + next_offset + size > end_of_buf) {
4112                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4113                         break;
4114                 }
4115
4116                 entryptr = entryptr + next_offset;
4117                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4118
4119                 len = le32_to_cpu(dir_info->FileNameLength);
4120                 if (entryptr + len < entryptr ||
4121                     entryptr + len > end_of_buf ||
4122                     entryptr + len + size > end_of_buf) {
4123                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4124                                  end_of_buf);
4125                         break;
4126                 }
4127
4128                 *lastentry = entryptr;
4129                 entrycount++;
4130
4131                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4132                 if (!next_offset)
4133                         break;
4134         }
4135
4136         return entrycount;
4137 }
4138
4139 /*
4140  * Readdir/FindFirst
4141  */
4142 int
4143 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4144                      u64 persistent_fid, u64 volatile_fid, int index,
4145                      struct cifs_search_info *srch_inf)
4146 {
4147         struct smb_rqst rqst;
4148         struct smb2_query_directory_req *req;
4149         struct smb2_query_directory_rsp *rsp = NULL;
4150         struct kvec iov[2];
4151         struct kvec rsp_iov;
4152         int rc = 0;
4153         int len;
4154         int resp_buftype = CIFS_NO_BUFFER;
4155         unsigned char *bufptr;
4156         struct TCP_Server_Info *server;
4157         struct cifs_ses *ses = tcon->ses;
4158         __le16 asteriks = cpu_to_le16('*');
4159         char *end_of_smb;
4160         unsigned int output_size = CIFSMaxBufSize;
4161         size_t info_buf_size;
4162         int flags = 0;
4163         unsigned int total_len;
4164
4165         if (ses && (ses->server))
4166                 server = ses->server;
4167         else
4168                 return -EIO;
4169
4170         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
4171                              &total_len);
4172         if (rc)
4173                 return rc;
4174
4175         if (smb3_encryption_required(tcon))
4176                 flags |= CIFS_TRANSFORM_REQ;
4177
4178         switch (srch_inf->info_level) {
4179         case SMB_FIND_FILE_DIRECTORY_INFO:
4180                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4181                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4182                 break;
4183         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4184                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4185                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4186                 break;
4187         default:
4188                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4189                          srch_inf->info_level);
4190                 rc = -EINVAL;
4191                 goto qdir_exit;
4192         }
4193
4194         req->FileIndex = cpu_to_le32(index);
4195         req->PersistentFileId = persistent_fid;
4196         req->VolatileFileId = volatile_fid;
4197
4198         len = 0x2;
4199         bufptr = req->Buffer;
4200         memcpy(bufptr, &asteriks, len);
4201
4202         req->FileNameOffset =
4203                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4204         req->FileNameLength = cpu_to_le16(len);
4205         /*
4206          * BB could be 30 bytes or so longer if we used SMB2 specific
4207          * buffer lengths, but this is safe and close enough.
4208          */
4209         output_size = min_t(unsigned int, output_size, server->maxBuf);
4210         output_size = min_t(unsigned int, output_size, 2 << 15);
4211         req->OutputBufferLength = cpu_to_le32(output_size);
4212
4213         iov[0].iov_base = (char *)req;
4214         /* 1 for Buffer */
4215         iov[0].iov_len = total_len - 1;
4216
4217         iov[1].iov_base = (char *)(req->Buffer);
4218         iov[1].iov_len = len;
4219
4220         memset(&rqst, 0, sizeof(struct smb_rqst));
4221         rqst.rq_iov = iov;
4222         rqst.rq_nvec = 2;
4223
4224         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4225                         tcon->ses->Suid, index, output_size);
4226
4227         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4228         cifs_small_buf_release(req);
4229         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4230
4231         if (rc) {
4232                 if (rc == -ENODATA &&
4233                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4234                         trace_smb3_query_dir_done(xid, persistent_fid,
4235                                 tcon->tid, tcon->ses->Suid, index, 0);
4236                         srch_inf->endOfSearch = true;
4237                         rc = 0;
4238                 } else {
4239                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4240                                 tcon->ses->Suid, index, 0, rc);
4241                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4242                 }
4243                 goto qdir_exit;
4244         }
4245
4246         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4247                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4248                                info_buf_size);
4249         if (rc) {
4250                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4251                         tcon->ses->Suid, index, 0, rc);
4252                 goto qdir_exit;
4253         }
4254
4255         srch_inf->unicode = true;
4256
4257         if (srch_inf->ntwrk_buf_start) {
4258                 if (srch_inf->smallBuf)
4259                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4260                 else
4261                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4262         }
4263         srch_inf->ntwrk_buf_start = (char *)rsp;
4264         srch_inf->srch_entries_start = srch_inf->last_entry =
4265                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4266         end_of_smb = rsp_iov.iov_len + (char *)rsp;
4267         srch_inf->entries_in_buffer =
4268                         num_entries(srch_inf->srch_entries_start, end_of_smb,
4269                                     &srch_inf->last_entry, info_buf_size);
4270         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4271         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4272                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4273                  srch_inf->srch_entries_start, srch_inf->last_entry);
4274         if (resp_buftype == CIFS_LARGE_BUFFER)
4275                 srch_inf->smallBuf = false;
4276         else if (resp_buftype == CIFS_SMALL_BUFFER)
4277                 srch_inf->smallBuf = true;
4278         else
4279                 cifs_tcon_dbg(VFS, "illegal search buffer type\n");
4280
4281         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4282                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4283         return rc;
4284
4285 qdir_exit:
4286         free_rsp_buf(resp_buftype, rsp);
4287         return rc;
4288 }
4289
4290 int
4291 SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
4292                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4293                u8 info_type, u32 additional_info,
4294                 void **data, unsigned int *size)
4295 {
4296         struct smb2_set_info_req *req;
4297         struct kvec *iov = rqst->rq_iov;
4298         unsigned int i, total_len;
4299         int rc;
4300
4301         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
4302         if (rc)
4303                 return rc;
4304
4305         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4306         req->InfoType = info_type;
4307         req->FileInfoClass = info_class;
4308         req->PersistentFileId = persistent_fid;
4309         req->VolatileFileId = volatile_fid;
4310         req->AdditionalInformation = cpu_to_le32(additional_info);
4311
4312         req->BufferOffset =
4313                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4314         req->BufferLength = cpu_to_le32(*size);
4315
4316         memcpy(req->Buffer, *data, *size);
4317         total_len += *size;
4318
4319         iov[0].iov_base = (char *)req;
4320         /* 1 for Buffer */
4321         iov[0].iov_len = total_len - 1;
4322
4323         for (i = 1; i < rqst->rq_nvec; i++) {
4324                 le32_add_cpu(&req->BufferLength, size[i]);
4325                 iov[i].iov_base = (char *)data[i];
4326                 iov[i].iov_len = size[i];
4327         }
4328
4329         return 0;
4330 }
4331
4332 void
4333 SMB2_set_info_free(struct smb_rqst *rqst)
4334 {
4335         if (rqst && rqst->rq_iov)
4336                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4337 }
4338
4339 static int
4340 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4341                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4342                u8 info_type, u32 additional_info, unsigned int num,
4343                 void **data, unsigned int *size)
4344 {
4345         struct smb_rqst rqst;
4346         struct smb2_set_info_rsp *rsp = NULL;
4347         struct kvec *iov;
4348         struct kvec rsp_iov;
4349         int rc = 0;
4350         int resp_buftype;
4351         struct cifs_ses *ses = tcon->ses;
4352         int flags = 0;
4353
4354         if (!ses || !(ses->server))
4355                 return -EIO;
4356
4357         if (!num)
4358                 return -EINVAL;
4359
4360         if (smb3_encryption_required(tcon))
4361                 flags |= CIFS_TRANSFORM_REQ;
4362
4363         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4364         if (!iov)
4365                 return -ENOMEM;
4366
4367         memset(&rqst, 0, sizeof(struct smb_rqst));
4368         rqst.rq_iov = iov;
4369         rqst.rq_nvec = num;
4370
4371         rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid,
4372                                 info_class, info_type, additional_info,
4373                                 data, size);
4374         if (rc) {
4375                 kfree(iov);
4376                 return rc;
4377         }
4378
4379
4380         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
4381                             &rsp_iov);
4382         SMB2_set_info_free(&rqst);
4383         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4384
4385         if (rc != 0) {
4386                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4387                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4388                                 ses->Suid, info_class, (__u32)info_type, rc);
4389         }
4390
4391         free_rsp_buf(resp_buftype, rsp);
4392         kfree(iov);
4393         return rc;
4394 }
4395
4396 int
4397 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4398              u64 volatile_fid, u32 pid, __le64 *eof)
4399 {
4400         struct smb2_file_eof_info info;
4401         void *data;
4402         unsigned int size;
4403
4404         info.EndOfFile = *eof;
4405
4406         data = &info;
4407         size = sizeof(struct smb2_file_eof_info);
4408
4409         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4410                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4411                         0, 1, &data, &size);
4412 }
4413
4414 int
4415 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4416                 u64 persistent_fid, u64 volatile_fid,
4417                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4418 {
4419         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4420                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4421                         1, (void **)&pnntsd, &pacllen);
4422 }
4423
4424 int
4425 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4426             u64 persistent_fid, u64 volatile_fid,
4427             struct smb2_file_full_ea_info *buf, int len)
4428 {
4429         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4430                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4431                 0, 1, (void **)&buf, &len);
4432 }
4433
4434 int
4435 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4436                   const u64 persistent_fid, const u64 volatile_fid,
4437                   __u8 oplock_level)
4438 {
4439         struct smb_rqst rqst;
4440         int rc;
4441         struct smb2_oplock_break *req = NULL;
4442         struct cifs_ses *ses = tcon->ses;
4443         int flags = CIFS_OBREAK_OP;
4444         unsigned int total_len;
4445         struct kvec iov[1];
4446         struct kvec rsp_iov;
4447         int resp_buf_type;
4448
4449         cifs_dbg(FYI, "SMB2_oplock_break\n");
4450         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4451                              &total_len);
4452         if (rc)
4453                 return rc;
4454
4455         if (smb3_encryption_required(tcon))
4456                 flags |= CIFS_TRANSFORM_REQ;
4457
4458         req->VolatileFid = volatile_fid;
4459         req->PersistentFid = persistent_fid;
4460         req->OplockLevel = oplock_level;
4461         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4462
4463         flags |= CIFS_NO_RSP_BUF;
4464
4465         iov[0].iov_base = (char *)req;
4466         iov[0].iov_len = total_len;
4467
4468         memset(&rqst, 0, sizeof(struct smb_rqst));
4469         rqst.rq_iov = iov;
4470         rqst.rq_nvec = 1;
4471
4472         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4473         cifs_small_buf_release(req);
4474
4475         if (rc) {
4476                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4477                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
4478         }
4479
4480         return rc;
4481 }
4482
4483 void
4484 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
4485                              struct kstatfs *kst)
4486 {
4487         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
4488                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
4489         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
4490         kst->f_bfree  = kst->f_bavail =
4491                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
4492         return;
4493 }
4494
4495 static void
4496 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
4497                         struct kstatfs *kst)
4498 {
4499         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
4500         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
4501         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
4502         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
4503                 kst->f_bavail = kst->f_bfree;
4504         else
4505                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
4506         if (response_data->TotalFileNodes != cpu_to_le64(-1))
4507                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
4508         if (response_data->FreeFileNodes != cpu_to_le64(-1))
4509                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
4510
4511         return;
4512 }
4513
4514 static int
4515 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
4516                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
4517 {
4518         int rc;
4519         struct smb2_query_info_req *req;
4520         unsigned int total_len;
4521
4522         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
4523
4524         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
4525                 return -EIO;
4526
4527         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
4528                              &total_len);
4529         if (rc)
4530                 return rc;
4531
4532         req->InfoType = SMB2_O_INFO_FILESYSTEM;
4533         req->FileInfoClass = level;
4534         req->PersistentFileId = persistent_fid;
4535         req->VolatileFileId = volatile_fid;
4536         /* 1 for pad */
4537         req->InputBufferOffset =
4538                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4539         req->OutputBufferLength = cpu_to_le32(
4540                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4541
4542         iov->iov_base = (char *)req;
4543         iov->iov_len = total_len;
4544         return 0;
4545 }
4546
4547 int
4548 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4549               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4550 {
4551         struct smb_rqst rqst;
4552         struct smb2_query_info_rsp *rsp = NULL;
4553         struct kvec iov;
4554         struct kvec rsp_iov;
4555         int rc = 0;
4556         int resp_buftype;
4557         struct cifs_ses *ses = tcon->ses;
4558         FILE_SYSTEM_POSIX_INFO *info = NULL;
4559         int flags = 0;
4560
4561         rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4562                                 sizeof(FILE_SYSTEM_POSIX_INFO),
4563                                 persistent_fid, volatile_fid);
4564         if (rc)
4565                 return rc;
4566
4567         if (smb3_encryption_required(tcon))
4568                 flags |= CIFS_TRANSFORM_REQ;
4569
4570         memset(&rqst, 0, sizeof(struct smb_rqst));
4571         rqst.rq_iov = &iov;
4572         rqst.rq_nvec = 1;
4573
4574         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4575         cifs_small_buf_release(iov.iov_base);
4576         if (rc) {
4577                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4578                 goto posix_qfsinf_exit;
4579         }
4580         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4581
4582         info = (FILE_SYSTEM_POSIX_INFO *)(
4583                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4584         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4585                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4586                                sizeof(FILE_SYSTEM_POSIX_INFO));
4587         if (!rc)
4588                 copy_posix_fs_info_to_kstatfs(info, fsdata);
4589
4590 posix_qfsinf_exit:
4591         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4592         return rc;
4593 }
4594
4595 int
4596 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
4597               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4598 {
4599         struct smb_rqst rqst;
4600         struct smb2_query_info_rsp *rsp = NULL;
4601         struct kvec iov;
4602         struct kvec rsp_iov;
4603         int rc = 0;
4604         int resp_buftype;
4605         struct cifs_ses *ses = tcon->ses;
4606         struct smb2_fs_full_size_info *info = NULL;
4607         int flags = 0;
4608
4609         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
4610                                 sizeof(struct smb2_fs_full_size_info),
4611                                 persistent_fid, volatile_fid);
4612         if (rc)
4613                 return rc;
4614
4615         if (smb3_encryption_required(tcon))
4616                 flags |= CIFS_TRANSFORM_REQ;
4617
4618         memset(&rqst, 0, sizeof(struct smb_rqst));
4619         rqst.rq_iov = &iov;
4620         rqst.rq_nvec = 1;
4621
4622         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4623         cifs_small_buf_release(iov.iov_base);
4624         if (rc) {
4625                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4626                 goto qfsinf_exit;
4627         }
4628         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4629
4630         info = (struct smb2_fs_full_size_info *)(
4631                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4632         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4633                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4634                                sizeof(struct smb2_fs_full_size_info));
4635         if (!rc)
4636                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
4637
4638 qfsinf_exit:
4639         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4640         return rc;
4641 }
4642
4643 int
4644 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4645               u64 persistent_fid, u64 volatile_fid, int level)
4646 {
4647         struct smb_rqst rqst;
4648         struct smb2_query_info_rsp *rsp = NULL;
4649         struct kvec iov;
4650         struct kvec rsp_iov;
4651         int rc = 0;
4652         int resp_buftype, max_len, min_len;
4653         struct cifs_ses *ses = tcon->ses;
4654         unsigned int rsp_len, offset;
4655         int flags = 0;
4656
4657         if (level == FS_DEVICE_INFORMATION) {
4658                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4659                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4660         } else if (level == FS_ATTRIBUTE_INFORMATION) {
4661                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4662                 min_len = MIN_FS_ATTR_INFO_SIZE;
4663         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4664                 max_len = sizeof(struct smb3_fs_ss_info);
4665                 min_len = sizeof(struct smb3_fs_ss_info);
4666         } else if (level == FS_VOLUME_INFORMATION) {
4667                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
4668                 min_len = sizeof(struct smb3_fs_vol_info);
4669         } else {
4670                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4671                 return -EINVAL;
4672         }
4673
4674         rc = build_qfs_info_req(&iov, tcon, level, max_len,
4675                                 persistent_fid, volatile_fid);
4676         if (rc)
4677                 return rc;
4678
4679         if (smb3_encryption_required(tcon))
4680                 flags |= CIFS_TRANSFORM_REQ;
4681
4682         memset(&rqst, 0, sizeof(struct smb_rqst));
4683         rqst.rq_iov = &iov;
4684         rqst.rq_nvec = 1;
4685
4686         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4687         cifs_small_buf_release(iov.iov_base);
4688         if (rc) {
4689                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4690                 goto qfsattr_exit;
4691         }
4692         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4693
4694         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4695         offset = le16_to_cpu(rsp->OutputBufferOffset);
4696         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
4697         if (rc)
4698                 goto qfsattr_exit;
4699
4700         if (level == FS_ATTRIBUTE_INFORMATION)
4701                 memcpy(&tcon->fsAttrInfo, offset
4702                         + (char *)rsp, min_t(unsigned int,
4703                         rsp_len, max_len));
4704         else if (level == FS_DEVICE_INFORMATION)
4705                 memcpy(&tcon->fsDevInfo, offset
4706                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4707         else if (level == FS_SECTOR_SIZE_INFORMATION) {
4708                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4709                         (offset + (char *)rsp);
4710                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4711                 tcon->perf_sector_size =
4712                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4713         } else if (level == FS_VOLUME_INFORMATION) {
4714                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
4715                         (offset + (char *)rsp);
4716                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
4717                 tcon->vol_create_time = vol_info->VolumeCreationTime;
4718         }
4719
4720 qfsattr_exit:
4721         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4722         return rc;
4723 }
4724
4725 int
4726 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4727            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4728            const __u32 num_lock, struct smb2_lock_element *buf)
4729 {
4730         struct smb_rqst rqst;
4731         int rc = 0;
4732         struct smb2_lock_req *req = NULL;
4733         struct kvec iov[2];
4734         struct kvec rsp_iov;
4735         int resp_buf_type;
4736         unsigned int count;
4737         int flags = CIFS_NO_RSP_BUF;
4738         unsigned int total_len;
4739
4740         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4741
4742         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4743         if (rc)
4744                 return rc;
4745
4746         if (smb3_encryption_required(tcon))
4747                 flags |= CIFS_TRANSFORM_REQ;
4748
4749         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4750         req->LockCount = cpu_to_le16(num_lock);
4751
4752         req->PersistentFileId = persist_fid;
4753         req->VolatileFileId = volatile_fid;
4754
4755         count = num_lock * sizeof(struct smb2_lock_element);
4756
4757         iov[0].iov_base = (char *)req;
4758         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4759         iov[1].iov_base = (char *)buf;
4760         iov[1].iov_len = count;
4761
4762         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4763
4764         memset(&rqst, 0, sizeof(struct smb_rqst));
4765         rqst.rq_iov = iov;
4766         rqst.rq_nvec = 2;
4767
4768         rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4769                             &rsp_iov);
4770         cifs_small_buf_release(req);
4771         if (rc) {
4772                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4773                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4774                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4775                                     tcon->ses->Suid, rc);
4776         }
4777
4778         return rc;
4779 }
4780
4781 int
4782 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
4783           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4784           const __u64 length, const __u64 offset, const __u32 lock_flags,
4785           const bool wait)
4786 {
4787         struct smb2_lock_element lock;
4788
4789         lock.Offset = cpu_to_le64(offset);
4790         lock.Length = cpu_to_le64(length);
4791         lock.Flags = cpu_to_le32(lock_flags);
4792         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
4793                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
4794
4795         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
4796 }
4797
4798 int
4799 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
4800                  __u8 *lease_key, const __le32 lease_state)
4801 {
4802         struct smb_rqst rqst;
4803         int rc;
4804         struct smb2_lease_ack *req = NULL;
4805         struct cifs_ses *ses = tcon->ses;
4806         int flags = CIFS_OBREAK_OP;
4807         unsigned int total_len;
4808         struct kvec iov[1];
4809         struct kvec rsp_iov;
4810         int resp_buf_type;
4811         __u64 *please_key_high;
4812         __u64 *please_key_low;
4813
4814         cifs_dbg(FYI, "SMB2_lease_break\n");
4815         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4816                              &total_len);
4817         if (rc)
4818                 return rc;
4819
4820         if (smb3_encryption_required(tcon))
4821                 flags |= CIFS_TRANSFORM_REQ;
4822
4823         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4824         req->StructureSize = cpu_to_le16(36);
4825         total_len += 12;
4826
4827         memcpy(req->LeaseKey, lease_key, 16);
4828         req->LeaseState = lease_state;
4829
4830         flags |= CIFS_NO_RSP_BUF;
4831
4832         iov[0].iov_base = (char *)req;
4833         iov[0].iov_len = total_len;
4834
4835         memset(&rqst, 0, sizeof(struct smb_rqst));
4836         rqst.rq_iov = iov;
4837         rqst.rq_nvec = 1;
4838
4839         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4840         cifs_small_buf_release(req);
4841
4842         please_key_low = (__u64 *)lease_key;
4843         please_key_high = (__u64 *)(lease_key+8);
4844         if (rc) {
4845                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4846                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
4847                         ses->Suid, *please_key_low, *please_key_high, rc);
4848                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
4849         } else
4850                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
4851                         ses->Suid, *please_key_low, *please_key_high);
4852
4853         return rc;
4854 }