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 ([email protected])
   7  *              Pavel Shilovsky ([email protected]) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/uuid.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/xattr.h>
  39 #include "smb2pdu.h"
  40 #include "cifsglob.h"
  41 #include "cifsacl.h"
  42 #include "cifsproto.h"
  43 #include "smb2proto.h"
  44 #include "cifs_unicode.h"
  45 #include "cifs_debug.h"
  46 #include "ntlmssp.h"
  47 #include "smb2status.h"
  48 #include "smb2glob.h"
  49 #include "cifspdu.h"
  50 #include "cifs_spnego.h"
  51 #include "smbdirect.h"
  52 #include "trace.h"
  53 #ifdef CONFIG_CIFS_DFS_UPCALL
  54 #include "dfs_cache.h"
  55 #endif
  56
  57 /*
  58  *  The following table defines the expected "StructureSize" of SMB2 requests
  59  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  60  *
  61  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  62  *  indexed by command in host byte order.
  63  */
  64 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  65         /* SMB2_NEGOTIATE */ 36,
  66         /* SMB2_SESSION_SETUP */ 25,
  67         /* SMB2_LOGOFF */ 4,
  68         /* SMB2_TREE_CONNECT */ 9,
  69         /* SMB2_TREE_DISCONNECT */ 4,
  70         /* SMB2_CREATE */ 57,
  71         /* SMB2_CLOSE */ 24,
  72         /* SMB2_FLUSH */ 24,
  73         /* SMB2_READ */ 49,
  74         /* SMB2_WRITE */ 49,
  75         /* SMB2_LOCK */ 48,
  76         /* SMB2_IOCTL */ 57,
  77         /* SMB2_CANCEL */ 4,
  78         /* SMB2_ECHO */ 4,
  79         /* SMB2_QUERY_DIRECTORY */ 33,
  80         /* SMB2_CHANGE_NOTIFY */ 32,
  81         /* SMB2_QUERY_INFO */ 41,
  82         /* SMB2_SET_INFO */ 33,
  83         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  84 };
  85
  86 int smb3_encryption_required(const struct cifs_tcon *tcon)
  87 {
  88         if (!tcon)
  89                 return 0;
  90         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  91             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  92                 return 1;
  93         if (tcon->seal &&
  94             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  95                 return 1;
  96         return 0;
  97 }
  98
  99 static void
 100 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
 101                   const struct cifs_tcon *tcon)
 102 {
 103         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 104         shdr->StructureSize = cpu_to_le16(64);
 105         shdr->Command = smb2_cmd;
 106         if (tcon && tcon->ses && tcon->ses->server) {
 107                 struct TCP_Server_Info *server = tcon->ses->server;
 108
 109                 spin_lock(&server->req_lock);
 110                 /* Request up to 10 credits but don't go over the limit. */
 111                 if (server->credits >= server->max_credits)
 112                         shdr->CreditRequest = cpu_to_le16(0);
 113                 else
 114                         shdr->CreditRequest = cpu_to_le16(
 115                                 min_t(int, server->max_credits -
 116                                                 server->credits, 10));
 117                 spin_unlock(&server->req_lock);
 118         } else {
 119                 shdr->CreditRequest = cpu_to_le16(2);
 120         }
 121         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 122
 123         if (!tcon)
 124                 goto out;
 125
 126         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 127         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 128         if ((tcon->ses) && (tcon->ses->server) &&
 129             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 130                 shdr->CreditCharge = cpu_to_le16(1);
 131         /* else CreditCharge MBZ */
 132
 133         shdr->TreeId = tcon->tid;
 134         /* Uid is not converted */
 135         if (tcon->ses)
 136                 shdr->SessionId = tcon->ses->Suid;
 137
 138         /*
 139          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 140          * to pass the path on the Open SMB prefixed by \\server\share.
 141          * Not sure when we would need to do the augmented path (if ever) and
 142          * setting this flag breaks the SMB2 open operation since it is
 143          * illegal to send an empty path name (without \\server\share prefix)
 144          * when the DFS flag is set in the SMB open header. We could
 145          * consider setting the flag on all operations other than open
 146          * but it is safer to net set it for now.
 147          */
 148 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 149                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 150
 151         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
 152             !smb3_encryption_required(tcon))
 153                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 154 out:
 155         return;
 156 }
 157
 158 #ifdef CONFIG_CIFS_DFS_UPCALL
 159 static int __smb2_reconnect(const struct nls_table *nlsc,
 160                             struct cifs_tcon *tcon)
 161 {
 162         int rc;
 163         struct dfs_cache_tgt_list tl;
 164         struct dfs_cache_tgt_iterator *it = NULL;
 165         char *tree;
 166         const char *tcp_host;
 167         size_t tcp_host_len;
 168         const char *dfs_host;
 169         size_t dfs_host_len;
 170
 171         tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL);
 172         if (!tree)
 173                 return -ENOMEM;
 174
 175         if (tcon->ipc) {
 176                 scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$",
 177                           tcon->ses->server->hostname);
 178                 rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
 179                 goto out;
 180         }
 181
 182         if (!tcon->dfs_path) {
 183                 rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
 184                 goto out;
 185         }
 186
 187         rc = dfs_cache_noreq_find(tcon->dfs_path + 1, NULL, &tl);
 188         if (rc)
 189                 goto out;
 190
 191         extract_unc_hostname(tcon->ses->server->hostname, &tcp_host,
 192                              &tcp_host_len);
 193
 194         for (it = dfs_cache_get_tgt_iterator(&tl); it;
 195              it = dfs_cache_get_next_tgt(&tl, it)) {
 196                 const char *tgt = dfs_cache_get_tgt_name(it);
 197
 198                 extract_unc_hostname(tgt, &dfs_host, &dfs_host_len);
 199
 200                 if (dfs_host_len != tcp_host_len
 201                     || strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) {
 202                         cifs_dbg(FYI, "%s: skipping %.*s, doesn't match %.*s",
 203                                  __func__,
 204                                  (int)dfs_host_len, dfs_host,
 205                                  (int)tcp_host_len, tcp_host);
 206                         continue;
 207                 }
 208
 209                 scnprintf(tree, MAX_TREE_SIZE, "\\%s", tgt);
 210
 211                 rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
 212                 if (!rc)
 213                         break;
 214                 if (rc == -EREMOTE)
 215                         break;
 216         }
 217
 218         if (!rc) {
 219                 if (it)
 220                         rc = dfs_cache_noreq_update_tgthint(tcon->dfs_path + 1,
 221                                                             it);
 222                 else
 223                         rc = -ENOENT;
 224         }
 225         dfs_cache_free_tgts(&tl);
 226 out:
 227         kfree(tree);
 228         return rc;
 229 }
 230 #else
 231 static inline int __smb2_reconnect(const struct nls_table *nlsc,
 232                                    struct cifs_tcon *tcon)
 233 {
 234         return SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
 235 }
 236 #endif
 237
 238 static int
 239 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 240 {
 241         int rc;
 242         struct nls_table *nls_codepage;
 243         struct cifs_ses *ses;
 244         struct TCP_Server_Info *server;
 245         int retries;
 246
 247         /*
 248          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 249          * check for tcp and smb session status done differently
 250          * for those three - in the calling routine.
 251          */
 252         if (tcon == NULL)
 253                 return 0;
 254
 255         if (smb2_command == SMB2_TREE_CONNECT)
 256                 return 0;
 257
 258         if (tcon->tidStatus == CifsExiting) {
 259                 /*
 260                  * only tree disconnect, open, and write,
 261                  * (and ulogoff which does not have tcon)
 262                  * are allowed as we start force umount.
 263                  */
 264                 if ((smb2_command != SMB2_WRITE) &&
 265                    (smb2_command != SMB2_CREATE) &&
 266                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 267                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 268                                  smb2_command);
 269                         return -ENODEV;
 270                 }
 271         }
 272         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 273             (!tcon->ses->server))
 274                 return -EIO;
 275
 276         ses = tcon->ses;
 277         server = ses->server;
 278
 279         retries = server->nr_targets;
 280
 281         /*
 282          * Give demultiplex thread up to 10 seconds to each target available for
 283          * reconnect -- should be greater than cifs socket timeout which is 7
 284          * seconds.
 285          */
 286         while (server->tcpStatus == CifsNeedReconnect) {
 287                 /*
 288                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 289                  * here since they are implicitly done when session drops.
 290                  */
 291                 switch (smb2_command) {
 292                 /*
 293                  * BB Should we keep oplock break and add flush to exceptions?
 294                  */
 295                 case SMB2_TREE_DISCONNECT:
 296                 case SMB2_CANCEL:
 297                 case SMB2_CLOSE:
 298                 case SMB2_OPLOCK_BREAK:
 299                         return -EAGAIN;
 300                 }
 301
 302                 rc = wait_event_interruptible_timeout(server->response_q,
 303                                                       (server->tcpStatus != CifsNeedReconnect),
 304                                                       10 * HZ);
 305                 if (rc < 0) {
 306                         cifs_dbg(FYI, "%s: aborting reconnect due to a received"
 307                                  " signal by the process\n", __func__);
 308                         return -ERESTARTSYS;
 309                 }
 310
 311                 /* are we still trying to reconnect? */
 312                 if (server->tcpStatus != CifsNeedReconnect)
 313                         break;
 314
 315                 if (--retries)
 316                         continue;
 317
 318                 /*
 319                  * on "soft" mounts we wait once. Hard mounts keep
 320                  * retrying until process is killed or server comes
 321                  * back on-line
 322                  */
 323                 if (!tcon->retry) {
 324                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 325                         return -EHOSTDOWN;
 326                 }
 327                 retries = server->nr_targets;
 328         }
 329
 330         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 331                 return 0;
 332
 333         nls_codepage = load_nls_default();
 334
 335         /*
 336          * need to prevent multiple threads trying to simultaneously reconnect
 337          * the same SMB session
 338          */
 339         mutex_lock(&tcon->ses->session_mutex);
 340
 341         /*
 342          * Recheck after acquire mutex. If another thread is negotiating
 343          * and the server never sends an answer the socket will be closed
 344          * and tcpStatus set to reconnect.
 345          */
 346         if (server->tcpStatus == CifsNeedReconnect) {
 347                 rc = -EHOSTDOWN;
 348                 mutex_unlock(&tcon->ses->session_mutex);
 349                 goto out;
 350         }
 351
 352         rc = cifs_negotiate_protocol(0, tcon->ses);
 353         if (!rc && tcon->ses->need_reconnect)
 354                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 355
 356         if (rc || !tcon->need_reconnect) {
 357                 mutex_unlock(&tcon->ses->session_mutex);
 358                 goto out;
 359         }
 360
 361         cifs_mark_open_files_invalid(tcon);
 362         if (tcon->use_persistent)
 363                 tcon->need_reopen_files = true;
 364
 365         rc = __smb2_reconnect(nls_codepage, tcon);
 366         mutex_unlock(&tcon->ses->session_mutex);
 367
 368         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 369         if (rc) {
 370                 /* If sess reconnected but tcon didn't, something strange ... */
 371                 printk_once(KERN_WARNING "reconnect tcon failed rc = %d\n", rc);
 372                 goto out;
 373         }
 374
 375         if (smb2_command != SMB2_INTERNAL_CMD)
 376                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
 377
 378         atomic_inc(&tconInfoReconnectCount);
 379 out:
 380         /*
 381          * Check if handle based operation so we know whether we can continue
 382          * or not without returning to caller to reset file handle.
 383          */
 384         /*
 385          * BB Is flush done by server on drop of tcp session? Should we special
 386          * case it and skip above?
 387          */
 388         switch (smb2_command) {
 389         case SMB2_FLUSH:
 390         case SMB2_READ:
 391         case SMB2_WRITE:
 392         case SMB2_LOCK:
 393         case SMB2_IOCTL:
 394         case SMB2_QUERY_DIRECTORY:
 395         case SMB2_CHANGE_NOTIFY:
 396         case SMB2_QUERY_INFO:
 397         case SMB2_SET_INFO:
 398                 rc = -EAGAIN;
 399         }
 400         unload_nls(nls_codepage);
 401         return rc;
 402 }
 403
 404 static void
 405 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
 406                unsigned int *total_len)
 407 {
 408         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 409         /* lookup word count ie StructureSize from table */
 410         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 411
 412         /*
 413          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 414          * largest operations (Create)
 415          */
 416         memset(buf, 0, 256);
 417
 418         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
 419         spdu->StructureSize2 = cpu_to_le16(parmsize);
 420
 421         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 422 }
 423
 424 /*
 425  * Allocate and return pointer to an SMB request hdr, and set basic
 426  * SMB information in the SMB header. If the return code is zero, this
 427  * function must have filled in request_buf pointer.
 428  */
 429 static int
 430 smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 431                     void **request_buf, unsigned int *total_len)
 432 {
 433         int rc;
 434
 435         rc = smb2_reconnect(smb2_command, tcon);
 436         if (rc)
 437                 return rc;
 438
 439         /* BB eventually switch this to SMB2 specific small buf size */
 440         if (smb2_command == SMB2_SET_INFO)
 441                 *request_buf = cifs_buf_get();
 442         else
 443                 *request_buf = cifs_small_buf_get();
 444         if (*request_buf == NULL) {
 445                 /* BB should we add a retry in here if not a writepage? */
 446                 return -ENOMEM;
 447         }
 448
 449         fill_small_buf(smb2_command, tcon,
 450                        (struct smb2_sync_hdr *)(*request_buf),
 451                        total_len);
 452
 453         if (tcon != NULL) {
 454                 uint16_t com_code = le16_to_cpu(smb2_command);
 455                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 456                 cifs_stats_inc(&tcon->num_smbs_sent);
 457         }
 458
 459         return rc;
 460 }
 461
 462
 463 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
 464 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
 465 #define SMB2_POSIX_EXTENSIONS_AVAILABLE         cpu_to_le16(0x100)
 466
 467 static void
 468 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 469 {
 470         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 471         pneg_ctxt->DataLength = cpu_to_le16(38);
 472         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 473         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 474         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 475         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 476 }
 477
 478 static void
 479 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 480 {
 481         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 482         pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + le16 cipher */
 483         pneg_ctxt->CipherCount = cpu_to_le16(1);
 484 /* pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;*/ /* not supported yet */
 485         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_CCM;
 486 }
 487
 488 static void
 489 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 490 {
 491         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 492         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 493         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 494         pneg_ctxt->Name[0] = 0x93;
 495         pneg_ctxt->Name[1] = 0xAD;
 496         pneg_ctxt->Name[2] = 0x25;
 497         pneg_ctxt->Name[3] = 0x50;
 498         pneg_ctxt->Name[4] = 0x9C;
 499         pneg_ctxt->Name[5] = 0xB4;
 500         pneg_ctxt->Name[6] = 0x11;
 501         pneg_ctxt->Name[7] = 0xE7;
 502         pneg_ctxt->Name[8] = 0xB4;
 503         pneg_ctxt->Name[9] = 0x23;
 504         pneg_ctxt->Name[10] = 0x83;
 505         pneg_ctxt->Name[11] = 0xDE;
 506         pneg_ctxt->Name[12] = 0x96;
 507         pneg_ctxt->Name[13] = 0x8B;
 508         pneg_ctxt->Name[14] = 0xCD;
 509         pneg_ctxt->Name[15] = 0x7C;
 510 }
 511
 512 static void
 513 assemble_neg_contexts(struct smb2_negotiate_req *req,
 514                       unsigned int *total_len)
 515 {
 516         char *pneg_ctxt = (char *)req;
 517         unsigned int ctxt_len;
 518
 519         if (*total_len > 200) {
 520                 /* In case length corrupted don't want to overrun smb buffer */
 521                 cifs_dbg(VFS, "Bad frame length assembling neg contexts\n");
 522                 return;
 523         }
 524
 525         /*
 526          * round up total_len of fixed part of SMB3 negotiate request to 8
 527          * byte boundary before adding negotiate contexts
 528          */
 529         *total_len = roundup(*total_len, 8);
 530
 531         pneg_ctxt = (*total_len) + (char *)req;
 532         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 533
 534         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 535         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 536         *total_len += ctxt_len;
 537         pneg_ctxt += ctxt_len;
 538
 539         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 540         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 541         *total_len += ctxt_len;
 542         pneg_ctxt += ctxt_len;
 543
 544         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 545         *total_len += sizeof(struct smb2_posix_neg_context);
 546
 547         req->NegotiateContextCount = cpu_to_le16(3);
 548 }
 549
 550 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 551 {
 552         unsigned int len = le16_to_cpu(ctxt->DataLength);
 553
 554         /* If invalid preauth context warn but use what we requested, SHA-512 */
 555         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 556                 printk_once(KERN_WARNING "server sent bad preauth context\n");
 557                 return;
 558         }
 559         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 560                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
 561         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 562                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
 563 }
 564
 565 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 566                               struct smb2_encryption_neg_context *ctxt)
 567 {
 568         unsigned int len = le16_to_cpu(ctxt->DataLength);
 569
 570         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 571         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 572                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
 573                 return -EINVAL;
 574         }
 575
 576         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 577                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
 578                 return -EINVAL;
 579         }
 580         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 581         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 582             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 583                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
 584                 return -EINVAL;
 585         }
 586         server->cipher_type = ctxt->Ciphers[0];
 587         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 588         return 0;
 589 }
 590
 591 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 592                                      struct TCP_Server_Info *server,
 593                                      unsigned int len_of_smb)
 594 {
 595         struct smb2_neg_context *pctx;
 596         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 597         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 598         unsigned int len_of_ctxts, i;
 599         int rc = 0;
 600
 601         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 602         if (len_of_smb <= offset) {
 603                 cifs_dbg(VFS, "Invalid response: negotiate context offset\n");
 604                 return -EINVAL;
 605         }
 606
 607         len_of_ctxts = len_of_smb - offset;
 608
 609         for (i = 0; i < ctxt_cnt; i++) {
 610                 int clen;
 611                 /* check that offset is not beyond end of SMB */
 612                 if (len_of_ctxts == 0)
 613                         break;
 614
 615                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 616                         break;
 617
 618                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 619                 clen = le16_to_cpu(pctx->DataLength);
 620                 if (clen > len_of_ctxts)
 621                         break;
 622
 623                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 624                         decode_preauth_context(
 625                                 (struct smb2_preauth_neg_context *)pctx);
 626                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 627                         rc = decode_encrypt_ctx(server,
 628                                 (struct smb2_encryption_neg_context *)pctx);
 629                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 630                         server->posix_ext_supported = true;
 631                 else
 632                         cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
 633                                 le16_to_cpu(pctx->ContextType));
 634
 635                 if (rc)
 636                         break;
 637                 /* offsets must be 8 byte aligned */
 638                 clen = (clen + 7) & ~0x7;
 639                 offset += clen + sizeof(struct smb2_neg_context);
 640                 len_of_ctxts -= clen;
 641         }
 642         return rc;
 643 }
 644
 645 static struct create_posix *
 646 create_posix_buf(umode_t mode)
 647 {
 648         struct create_posix *buf;
 649
 650         buf = kzalloc(sizeof(struct create_posix),
 651                         GFP_KERNEL);
 652         if (!buf)
 653                 return NULL;
 654
 655         buf->ccontext.DataOffset =
 656                 cpu_to_le16(offsetof(struct create_posix, Mode));
 657         buf->ccontext.DataLength = cpu_to_le32(4);
 658         buf->ccontext.NameOffset =
 659                 cpu_to_le16(offsetof(struct create_posix, Name));
 660         buf->ccontext.NameLength = cpu_to_le16(16);
 661
 662         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 663         buf->Name[0] = 0x93;
 664         buf->Name[1] = 0xAD;
 665         buf->Name[2] = 0x25;
 666         buf->Name[3] = 0x50;
 667         buf->Name[4] = 0x9C;
 668         buf->Name[5] = 0xB4;
 669         buf->Name[6] = 0x11;
 670         buf->Name[7] = 0xE7;
 671         buf->Name[8] = 0xB4;
 672         buf->Name[9] = 0x23;
 673         buf->Name[10] = 0x83;
 674         buf->Name[11] = 0xDE;
 675         buf->Name[12] = 0x96;
 676         buf->Name[13] = 0x8B;
 677         buf->Name[14] = 0xCD;
 678         buf->Name[15] = 0x7C;
 679         buf->Mode = cpu_to_le32(mode);
 680         cifs_dbg(FYI, "mode on posix create 0%o", mode);
 681         return buf;
 682 }
 683
 684 static int
 685 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 686 {
 687         struct smb2_create_req *req = iov[0].iov_base;
 688         unsigned int num = *num_iovec;
 689
 690         iov[num].iov_base = create_posix_buf(mode);
 691         if (iov[num].iov_base == NULL)
 692                 return -ENOMEM;
 693         iov[num].iov_len = sizeof(struct create_posix);
 694         if (!req->CreateContextsOffset)
 695                 req->CreateContextsOffset = cpu_to_le32(
 696                                 sizeof(struct smb2_create_req) +
 697                                 iov[num - 1].iov_len);
 698         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 699         *num_iovec = num + 1;
 700         return 0;
 701 }
 702
 703
 704 /*
 705  *
 706  *      SMB2 Worker functions follow:
 707  *
 708  *      The general structure of the worker functions is:
 709  *      1) Call smb2_init (assembles SMB2 header)
 710  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 711  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 712  *      4) Decode SMB2 command specific fields in the fixed length area
 713  *      5) Decode variable length data area (if any for this SMB2 command type)
 714  *      6) Call free smb buffer
 715  *      7) return
 716  *
 717  */
 718
 719 int
 720 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 721 {
 722         struct smb_rqst rqst;
 723         struct smb2_negotiate_req *req;
 724         struct smb2_negotiate_rsp *rsp;
 725         struct kvec iov[1];
 726         struct kvec rsp_iov;
 727         int rc = 0;
 728         int resp_buftype;
 729         struct TCP_Server_Info *server = ses->server;
 730         int blob_offset, blob_length;
 731         char *security_blob;
 732         int flags = CIFS_NEG_OP;
 733         unsigned int total_len;
 734
 735         cifs_dbg(FYI, "Negotiate protocol\n");
 736
 737         if (!server) {
 738                 WARN(1, "%s: server is NULL!\n", __func__);
 739                 return -EIO;
 740         }
 741
 742         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 743         if (rc)
 744                 return rc;
 745
 746         req->sync_hdr.SessionId = 0;
 747
 748         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 749         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 750
 751         if (strcmp(ses->server->vals->version_string,
 752                    SMB3ANY_VERSION_STRING) == 0) {
 753                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 754                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 755                 req->DialectCount = cpu_to_le16(2);
 756                 total_len += 4;
 757         } else if (strcmp(ses->server->vals->version_string,
 758                    SMBDEFAULT_VERSION_STRING) == 0) {
 759                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 760                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 761                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 762                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 763                 req->DialectCount = cpu_to_le16(4);
 764                 total_len += 8;
 765         } else {
 766                 /* otherwise send specific dialect */
 767                 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 768                 req->DialectCount = cpu_to_le16(1);
 769                 total_len += 2;
 770         }
 771
 772         /* only one of SMB2 signing flags may be set in SMB2 request */
 773         if (ses->sign)
 774                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 775         else if (global_secflags & CIFSSEC_MAY_SIGN)
 776                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 777         else
 778                 req->SecurityMode = 0;
 779
 780         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 781
 782         /* ClientGUID must be zero for SMB2.02 dialect */
 783         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 784                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 785         else {
 786                 memcpy(req->ClientGUID, server->client_guid,
 787                         SMB2_CLIENT_GUID_SIZE);
 788                 if ((ses->server->vals->protocol_id == SMB311_PROT_ID) ||
 789                     (strcmp(ses->server->vals->version_string,
 790                      SMBDEFAULT_VERSION_STRING) == 0))
 791                         assemble_neg_contexts(req, &total_len);
 792         }
 793         iov[0].iov_base = (char *)req;
 794         iov[0].iov_len = total_len;
 795
 796         memset(&rqst, 0, sizeof(struct smb_rqst));
 797         rqst.rq_iov = iov;
 798         rqst.rq_nvec = 1;
 799
 800         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
 801         cifs_small_buf_release(req);
 802         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 803         /*
 804          * No tcon so can't do
 805          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 806          */
 807         if (rc == -EOPNOTSUPP) {
 808                 cifs_dbg(VFS, "Dialect not supported by server. Consider "
 809                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 810                         " older servers\n");
 811                 goto neg_exit;
 812         } else if (rc != 0)
 813                 goto neg_exit;
 814
 815         if (strcmp(ses->server->vals->version_string,
 816                    SMB3ANY_VERSION_STRING) == 0) {
 817                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 818                         cifs_dbg(VFS,
 819                                 "SMB2 dialect returned but not requested\n");
 820                         return -EIO;
 821                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 822                         cifs_dbg(VFS,
 823                                 "SMB2.1 dialect returned but not requested\n");
 824                         return -EIO;
 825                 }
 826         } else if (strcmp(ses->server->vals->version_string,
 827                    SMBDEFAULT_VERSION_STRING) == 0) {
 828                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 829                         cifs_dbg(VFS,
 830                                 "SMB2 dialect returned but not requested\n");
 831                         return -EIO;
 832                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 833                         /* ops set to 3.0 by default for default so update */
 834                         ses->server->ops = &smb21_operations;
 835                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 836                         ses->server->ops = &smb311_operations;
 837         } else if (le16_to_cpu(rsp->DialectRevision) !=
 838                                 ses->server->vals->protocol_id) {
 839                 /* if requested single dialect ensure returned dialect matched */
 840                 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 841                         le16_to_cpu(rsp->DialectRevision));
 842                 return -EIO;
 843         }
 844
 845         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 846
 847         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 848                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 849         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 850                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 851         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 852                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 853         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 854                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 855         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 856                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 857         else {
 858                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 859                          le16_to_cpu(rsp->DialectRevision));
 860                 rc = -EIO;
 861                 goto neg_exit;
 862         }
 863         server->dialect = le16_to_cpu(rsp->DialectRevision);
 864
 865         /*
 866          * Keep a copy of the hash after negprot. This hash will be
 867          * the starting hash value for all sessions made from this
 868          * server.
 869          */
 870         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 871                SMB2_PREAUTH_HASH_SIZE);
 872
 873         /* SMB2 only has an extended negflavor */
 874         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 875         /* set it to the maximum buffer size value we can send with 1 credit */
 876         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 877                                SMB2_MAX_BUFFER_SIZE);
 878         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 879         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 880         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 881         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 882                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 883                                 server->sec_mode);
 884         server->capabilities = le32_to_cpu(rsp->Capabilities);
 885         /* Internal types */
 886         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 887
 888         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 889                                                (struct smb2_sync_hdr *)rsp);
 890         /*
 891          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 892          * for us will be
 893          *      ses->sectype = RawNTLMSSP;
 894          * but for time being this is our only auth choice so doesn't matter.
 895          * We just found a server which sets blob length to zero expecting raw.
 896          */
 897         if (blob_length == 0) {
 898                 cifs_dbg(FYI, "missing security blob on negprot\n");
 899                 server->sec_ntlmssp = true;
 900         }
 901
 902         rc = cifs_enable_signing(server, ses->sign);
 903         if (rc)
 904                 goto neg_exit;
 905         if (blob_length) {
 906                 rc = decode_negTokenInit(security_blob, blob_length, server);
 907                 if (rc == 1)
 908                         rc = 0;
 909                 else if (rc == 0)
 910                         rc = -EIO;
 911         }
 912
 913         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 914                 if (rsp->NegotiateContextCount)
 915                         rc = smb311_decode_neg_context(rsp, server,
 916                                                        rsp_iov.iov_len);
 917                 else
 918                         cifs_dbg(VFS, "Missing expected negotiate contexts\n");
 919         }
 920 neg_exit:
 921         free_rsp_buf(resp_buftype, rsp);
 922         return rc;
 923 }
 924
 925 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 926 {
 927         int rc;
 928         struct validate_negotiate_info_req *pneg_inbuf;
 929         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 930         u32 rsplen;
 931         u32 inbuflen; /* max of 4 dialects */
 932
 933         cifs_dbg(FYI, "validate negotiate\n");
 934
 935         /* In SMB3.11 preauth integrity supersedes validate negotiate */
 936         if (tcon->ses->server->dialect == SMB311_PROT_ID)
 937                 return 0;
 938
 939         /*
 940          * validation ioctl must be signed, so no point sending this if we
 941          * can not sign it (ie are not known user).  Even if signing is not
 942          * required (enabled but not negotiated), in those cases we selectively
 943          * sign just this, the first and only signed request on a connection.
 944          * Having validation of negotiate info  helps reduce attack vectors.
 945          */
 946         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
 947                 return 0; /* validation requires signing */
 948
 949         if (tcon->ses->user_name == NULL) {
 950                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
 951                 return 0; /* validation requires signing */
 952         }
 953
 954         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
 955                 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
 956
 957         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
 958         if (!pneg_inbuf)
 959                 return -ENOMEM;
 960
 961         pneg_inbuf->Capabilities =
 962                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 963         memcpy(pneg_inbuf->Guid, tcon->ses->server->client_guid,
 964                                         SMB2_CLIENT_GUID_SIZE);
 965
 966         if (tcon->ses->sign)
 967                 pneg_inbuf->SecurityMode =
 968                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 969         else if (global_secflags & CIFSSEC_MAY_SIGN)
 970                 pneg_inbuf->SecurityMode =
 971                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 972         else
 973                 pneg_inbuf->SecurityMode = 0;
 974
 975
 976         if (strcmp(tcon->ses->server->vals->version_string,
 977                 SMB3ANY_VERSION_STRING) == 0) {
 978                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 979                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 980                 pneg_inbuf->DialectCount = cpu_to_le16(2);
 981                 /* structure is big enough for 3 dialects, sending only 2 */
 982                 inbuflen = sizeof(*pneg_inbuf) -
 983                                 (2 * sizeof(pneg_inbuf->Dialects[0]));
 984         } else if (strcmp(tcon->ses->server->vals->version_string,
 985                 SMBDEFAULT_VERSION_STRING) == 0) {
 986                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 987                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 988                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 989                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 990                 pneg_inbuf->DialectCount = cpu_to_le16(4);
 991                 /* structure is big enough for 3 dialects */
 992                 inbuflen = sizeof(*pneg_inbuf);
 993         } else {
 994                 /* otherwise specific dialect was requested */
 995                 pneg_inbuf->Dialects[0] =
 996                         cpu_to_le16(tcon->ses->server->vals->protocol_id);
 997                 pneg_inbuf->DialectCount = cpu_to_le16(1);
 998                 /* structure is big enough for 3 dialects, sending only 1 */
 999                 inbuflen = sizeof(*pneg_inbuf) -
1000                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
1001         }
1002
1003         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1004                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1005                 (char *)pneg_inbuf, inbuflen, (char **)&pneg_rsp, &rsplen);
1006         if (rc == -EOPNOTSUPP) {
1007                 /*
1008                  * Old Windows versions or Netapp SMB server can return
1009                  * not supported error. Client should accept it.
1010                  */
1011                 cifs_dbg(VFS, "Server does not support validate negotiate\n");
1012                 return 0;
1013         } else if (rc != 0) {
1014                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
1015                 rc = -EIO;
1016                 goto out_free_inbuf;
1017         }
1018
1019         rc = -EIO;
1020         if (rsplen != sizeof(*pneg_rsp)) {
1021                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
1022                          rsplen);
1023
1024                 /* relax check since Mac returns max bufsize allowed on ioctl */
1025                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1026                         goto out_free_rsp;
1027         }
1028
1029         /* check validate negotiate info response matches what we got earlier */
1030         if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
1031                 goto vneg_out;
1032
1033         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
1034                 goto vneg_out;
1035
1036         /* do not validate server guid because not saved at negprot time yet */
1037
1038         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1039               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
1040                 goto vneg_out;
1041
1042         /* validate negotiate successful */
1043         rc = 0;
1044         cifs_dbg(FYI, "validate negotiate info successful\n");
1045         goto out_free_rsp;
1046
1047 vneg_out:
1048         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1049 out_free_rsp:
1050         kfree(pneg_rsp);
1051 out_free_inbuf:
1052         kfree(pneg_inbuf);
1053         return rc;
1054 }
1055
1056 enum securityEnum
1057 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1058 {
1059         switch (requested) {
1060         case Kerberos:
1061         case RawNTLMSSP:
1062                 return requested;
1063         case NTLMv2:
1064                 return RawNTLMSSP;
1065         case Unspecified:
1066                 if (server->sec_ntlmssp &&
1067                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1068                         return RawNTLMSSP;
1069                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1070                         (global_secflags & CIFSSEC_MAY_KRB5))
1071                         return Kerberos;
1072                 /* Fallthrough */
1073         default:
1074                 return Unspecified;
1075         }
1076 }
1077
1078 struct SMB2_sess_data {
1079         unsigned int xid;
1080         struct cifs_ses *ses;
1081         struct nls_table *nls_cp;
1082         void (*func)(struct SMB2_sess_data *);
1083         int result;
1084         u64 previous_session;
1085
1086         /* we will send the SMB in three pieces:
1087          * a fixed length beginning part, an optional
1088          * SPNEGO blob (which can be zero length), and a
1089          * last part which will include the strings
1090          * and rest of bcc area. This allows us to avoid
1091          * a large buffer 17K allocation
1092          */
1093         int buf0_type;
1094         struct kvec iov[2];
1095 };
1096
1097 static int
1098 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1099 {
1100         int rc;
1101         struct cifs_ses *ses = sess_data->ses;
1102         struct smb2_sess_setup_req *req;
1103         struct TCP_Server_Info *server = ses->server;
1104         unsigned int total_len;
1105
1106         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
1107                              &total_len);
1108         if (rc)
1109                 return rc;
1110
1111         /* First session, not a reauthenticate */
1112         req->sync_hdr.SessionId = 0;
1113
1114         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
1115         req->PreviousSessionId = sess_data->previous_session;
1116
1117         req->Flags = 0; /* MBZ */
1118
1119         /* enough to enable echos and oplocks and one max size write */
1120         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1121
1122         /* only one of SMB2 signing flags may be set in SMB2 request */
1123         if (server->sign)
1124                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1125         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1126                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1127         else
1128                 req->SecurityMode = 0;
1129
1130         req->Capabilities = 0;
1131         req->Channel = 0; /* MBZ */
1132
1133         sess_data->iov[0].iov_base = (char *)req;
1134         /* 1 for pad */
1135         sess_data->iov[0].iov_len = total_len - 1;
1136         /*
1137          * This variable will be used to clear the buffer
1138          * allocated above in case of any error in the calling function.
1139          */
1140         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1141
1142         return 0;
1143 }
1144
1145 static void
1146 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1147 {
1148         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1149         sess_data->buf0_type = CIFS_NO_BUFFER;
1150 }
1151
1152 static int
1153 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1154 {
1155         int rc;
1156         struct smb_rqst rqst;
1157         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1158         struct kvec rsp_iov = { NULL, 0 };
1159
1160         /* Testing shows that buffer offset must be at location of Buffer[0] */
1161         req->SecurityBufferOffset =
1162                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1163         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1164
1165         memset(&rqst, 0, sizeof(struct smb_rqst));
1166         rqst.rq_iov = sess_data->iov;
1167         rqst.rq_nvec = 2;
1168
1169         /* BB add code to build os and lm fields */
1170         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1171                             &rqst,
1172                             &sess_data->buf0_type,
1173                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1174         cifs_small_buf_release(sess_data->iov[0].iov_base);
1175         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1176
1177         return rc;
1178 }
1179
1180 static int
1181 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1182 {
1183         int rc = 0;
1184         struct cifs_ses *ses = sess_data->ses;
1185
1186         mutex_lock(&ses->server->srv_mutex);
1187         if (ses->server->ops->generate_signingkey) {
1188                 rc = ses->server->ops->generate_signingkey(ses);
1189                 if (rc) {
1190                         cifs_dbg(FYI,
1191                                 "SMB3 session key generation failed\n");
1192                         mutex_unlock(&ses->server->srv_mutex);
1193                         return rc;
1194                 }
1195         }
1196         if (!ses->server->session_estab) {
1197                 ses->server->sequence_number = 0x2;
1198                 ses->server->session_estab = true;
1199         }
1200         mutex_unlock(&ses->server->srv_mutex);
1201
1202         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1203         spin_lock(&GlobalMid_Lock);
1204         ses->status = CifsGood;
1205         ses->need_reconnect = false;
1206         spin_unlock(&GlobalMid_Lock);
1207         return rc;
1208 }
1209
1210 #ifdef CONFIG_CIFS_UPCALL
1211 static void
1212 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1213 {
1214         int rc;
1215         struct cifs_ses *ses = sess_data->ses;
1216         struct cifs_spnego_msg *msg;
1217         struct key *spnego_key = NULL;
1218         struct smb2_sess_setup_rsp *rsp = NULL;
1219
1220         rc = SMB2_sess_alloc_buffer(sess_data);
1221         if (rc)
1222                 goto out;
1223
1224         spnego_key = cifs_get_spnego_key(ses);
1225         if (IS_ERR(spnego_key)) {
1226                 rc = PTR_ERR(spnego_key);
1227                 spnego_key = NULL;
1228                 goto out;
1229         }
1230
1231         msg = spnego_key->payload.data[0];
1232         /*
1233          * check version field to make sure that cifs.upcall is
1234          * sending us a response in an expected form
1235          */
1236         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1237                 cifs_dbg(VFS,
1238                           "bad cifs.upcall version. Expected %d got %d",
1239                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1240                 rc = -EKEYREJECTED;
1241                 goto out_put_spnego_key;
1242         }
1243
1244         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1245                                          GFP_KERNEL);
1246         if (!ses->auth_key.response) {
1247                 cifs_dbg(VFS,
1248                         "Kerberos can't allocate (%u bytes) memory",
1249                         msg->sesskey_len);
1250                 rc = -ENOMEM;
1251                 goto out_put_spnego_key;
1252         }
1253         ses->auth_key.len = msg->sesskey_len;
1254
1255         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1256         sess_data->iov[1].iov_len = msg->secblob_len;
1257
1258         rc = SMB2_sess_sendreceive(sess_data);
1259         if (rc)
1260                 goto out_put_spnego_key;
1261
1262         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1263         ses->Suid = rsp->sync_hdr.SessionId;
1264
1265         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1266
1267         rc = SMB2_sess_establish_session(sess_data);
1268 out_put_spnego_key:
1269         key_invalidate(spnego_key);
1270         key_put(spnego_key);
1271 out:
1272         sess_data->result = rc;
1273         sess_data->func = NULL;
1274         SMB2_sess_free_buffer(sess_data);
1275 }
1276 #else
1277 static void
1278 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1279 {
1280         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1281         sess_data->result = -EOPNOTSUPP;
1282         sess_data->func = NULL;
1283 }
1284 #endif
1285
1286 static void
1287 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1288
1289 static void
1290 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1291 {
1292         int rc;
1293         struct cifs_ses *ses = sess_data->ses;
1294         struct smb2_sess_setup_rsp *rsp = NULL;
1295         char *ntlmssp_blob = NULL;
1296         bool use_spnego = false; /* else use raw ntlmssp */
1297         u16 blob_length = 0;
1298
1299         /*
1300          * If memory allocation is successful, caller of this function
1301          * frees it.
1302          */
1303         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1304         if (!ses->ntlmssp) {
1305                 rc = -ENOMEM;
1306                 goto out_err;
1307         }
1308         ses->ntlmssp->sesskey_per_smbsess = true;
1309
1310         rc = SMB2_sess_alloc_buffer(sess_data);
1311         if (rc)
1312                 goto out_err;
1313
1314         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1315                                GFP_KERNEL);
1316         if (ntlmssp_blob == NULL) {
1317                 rc = -ENOMEM;
1318                 goto out;
1319         }
1320
1321         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1322         if (use_spnego) {
1323                 /* BB eventually need to add this */
1324                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1325                 rc = -EOPNOTSUPP;
1326                 goto out;
1327         } else {
1328                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1329                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1330         }
1331         sess_data->iov[1].iov_base = ntlmssp_blob;
1332         sess_data->iov[1].iov_len = blob_length;
1333
1334         rc = SMB2_sess_sendreceive(sess_data);
1335         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1336
1337         /* If true, rc here is expected and not an error */
1338         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1339                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1340                 rc = 0;
1341
1342         if (rc)
1343                 goto out;
1344
1345         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1346                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1347                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1348                         le16_to_cpu(rsp->SecurityBufferOffset));
1349                 rc = -EIO;
1350                 goto out;
1351         }
1352         rc = decode_ntlmssp_challenge(rsp->Buffer,
1353                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1354         if (rc)
1355                 goto out;
1356
1357         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1358
1359
1360         ses->Suid = rsp->sync_hdr.SessionId;
1361         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1362
1363 out:
1364         kfree(ntlmssp_blob);
1365         SMB2_sess_free_buffer(sess_data);
1366         if (!rc) {
1367                 sess_data->result = 0;
1368                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1369                 return;
1370         }
1371 out_err:
1372         kfree(ses->ntlmssp);
1373         ses->ntlmssp = NULL;
1374         sess_data->result = rc;
1375         sess_data->func = NULL;
1376 }
1377
1378 static void
1379 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1380 {
1381         int rc;
1382         struct cifs_ses *ses = sess_data->ses;
1383         struct smb2_sess_setup_req *req;
1384         struct smb2_sess_setup_rsp *rsp = NULL;
1385         unsigned char *ntlmssp_blob = NULL;
1386         bool use_spnego = false; /* else use raw ntlmssp */
1387         u16 blob_length = 0;
1388
1389         rc = SMB2_sess_alloc_buffer(sess_data);
1390         if (rc)
1391                 goto out;
1392
1393         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1394         req->sync_hdr.SessionId = ses->Suid;
1395
1396         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1397                                         sess_data->nls_cp);
1398         if (rc) {
1399                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1400                 goto out;
1401         }
1402
1403         if (use_spnego) {
1404                 /* BB eventually need to add this */
1405                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1406                 rc = -EOPNOTSUPP;
1407                 goto out;
1408         }
1409         sess_data->iov[1].iov_base = ntlmssp_blob;
1410         sess_data->iov[1].iov_len = blob_length;
1411
1412         rc = SMB2_sess_sendreceive(sess_data);
1413         if (rc)
1414                 goto out;
1415
1416         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1417
1418         ses->Suid = rsp->sync_hdr.SessionId;
1419         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1420
1421         rc = SMB2_sess_establish_session(sess_data);
1422 out:
1423         kfree(ntlmssp_blob);
1424         SMB2_sess_free_buffer(sess_data);
1425         kfree(ses->ntlmssp);
1426         ses->ntlmssp = NULL;
1427         sess_data->result = rc;
1428         sess_data->func = NULL;
1429 }
1430
1431 static int
1432 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1433 {
1434         int type;
1435
1436         type = smb2_select_sectype(ses->server, ses->sectype);
1437         cifs_dbg(FYI, "sess setup type %d\n", type);
1438         if (type == Unspecified) {
1439                 cifs_dbg(VFS,
1440                         "Unable to select appropriate authentication method!");
1441                 return -EINVAL;
1442         }
1443
1444         switch (type) {
1445         case Kerberos:
1446                 sess_data->func = SMB2_auth_kerberos;
1447                 break;
1448         case RawNTLMSSP:
1449                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1450                 break;
1451         default:
1452                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1453                 return -EOPNOTSUPP;
1454         }
1455
1456         return 0;
1457 }
1458
1459 int
1460 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1461                 const struct nls_table *nls_cp)
1462 {
1463         int rc = 0;
1464         struct TCP_Server_Info *server = ses->server;
1465         struct SMB2_sess_data *sess_data;
1466
1467         cifs_dbg(FYI, "Session Setup\n");
1468
1469         if (!server) {
1470                 WARN(1, "%s: server is NULL!\n", __func__);
1471                 return -EIO;
1472         }
1473
1474         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1475         if (!sess_data)
1476                 return -ENOMEM;
1477
1478         rc = SMB2_select_sec(ses, sess_data);
1479         if (rc)
1480                 goto out;
1481         sess_data->xid = xid;
1482         sess_data->ses = ses;
1483         sess_data->buf0_type = CIFS_NO_BUFFER;
1484         sess_data->nls_cp = (struct nls_table *) nls_cp;
1485         sess_data->previous_session = ses->Suid;
1486
1487         /*
1488          * Initialize the session hash with the server one.
1489          */
1490         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1491                SMB2_PREAUTH_HASH_SIZE);
1492
1493         while (sess_data->func)
1494                 sess_data->func(sess_data);
1495
1496         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1497                 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1498         rc = sess_data->result;
1499 out:
1500         kfree(sess_data);
1501         return rc;
1502 }
1503
1504 int
1505 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1506 {
1507         struct smb_rqst rqst;
1508         struct smb2_logoff_req *req; /* response is also trivial struct */
1509         int rc = 0;
1510         struct TCP_Server_Info *server;
1511         int flags = 0;
1512         unsigned int total_len;
1513         struct kvec iov[1];
1514         struct kvec rsp_iov;
1515         int resp_buf_type;
1516
1517         cifs_dbg(FYI, "disconnect session %p\n", ses);
1518
1519         if (ses && (ses->server))
1520                 server = ses->server;
1521         else
1522                 return -EIO;
1523
1524         /* no need to send SMB logoff if uid already closed due to reconnect */
1525         if (ses->need_reconnect)
1526                 goto smb2_session_already_dead;
1527
1528         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1529         if (rc)
1530                 return rc;
1531
1532          /* since no tcon, smb2_init can not do this, so do here */
1533         req->sync_hdr.SessionId = ses->Suid;
1534
1535         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1536                 flags |= CIFS_TRANSFORM_REQ;
1537         else if (server->sign)
1538                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1539
1540         flags |= CIFS_NO_RESP;
1541
1542         iov[0].iov_base = (char *)req;
1543         iov[0].iov_len = total_len;
1544
1545         memset(&rqst, 0, sizeof(struct smb_rqst));
1546         rqst.rq_iov = iov;
1547         rqst.rq_nvec = 1;
1548
1549         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1550         cifs_small_buf_release(req);
1551         /*
1552          * No tcon so can't do
1553          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1554          */
1555
1556 smb2_session_already_dead:
1557         return rc;
1558 }
1559
1560 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1561 {
1562         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1563 }
1564
1565 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1566
1567 /* These are similar values to what Windows uses */
1568 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1569 {
1570         tcon->max_chunks = 256;
1571         tcon->max_bytes_chunk = 1048576;
1572         tcon->max_bytes_copy = 16777216;
1573 }
1574
1575 int
1576 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1577           struct cifs_tcon *tcon, const struct nls_table *cp)
1578 {
1579         struct smb_rqst rqst;
1580         struct smb2_tree_connect_req *req;
1581         struct smb2_tree_connect_rsp *rsp = NULL;
1582         struct kvec iov[2];
1583         struct kvec rsp_iov = { NULL, 0 };
1584         int rc = 0;
1585         int resp_buftype;
1586         int unc_path_len;
1587         __le16 *unc_path = NULL;
1588         int flags = 0;
1589         unsigned int total_len;
1590
1591         cifs_dbg(FYI, "TCON\n");
1592
1593         if (!(ses->server) || !tree)
1594                 return -EIO;
1595
1596         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1597         if (unc_path == NULL)
1598                 return -ENOMEM;
1599
1600         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1601         unc_path_len *= 2;
1602         if (unc_path_len < 2) {
1603                 kfree(unc_path);
1604                 return -EINVAL;
1605         }
1606
1607         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1608         tcon->tid = 0;
1609         atomic_set(&tcon->num_remote_opens, 0);
1610         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1611                              &total_len);
1612         if (rc) {
1613                 kfree(unc_path);
1614                 return rc;
1615         }
1616
1617         if (smb3_encryption_required(tcon))
1618                 flags |= CIFS_TRANSFORM_REQ;
1619
1620         iov[0].iov_base = (char *)req;
1621         /* 1 for pad */
1622         iov[0].iov_len = total_len - 1;
1623
1624         /* Testing shows that buffer offset must be at location of Buffer[0] */
1625         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1626                         - 1 /* pad */);
1627         req->PathLength = cpu_to_le16(unc_path_len - 2);
1628         iov[1].iov_base = unc_path;
1629         iov[1].iov_len = unc_path_len;
1630
1631         /* 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1 */
1632         if ((ses->server->dialect == SMB311_PROT_ID) &&
1633             !smb3_encryption_required(tcon))
1634                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1635
1636         memset(&rqst, 0, sizeof(struct smb_rqst));
1637         rqst.rq_iov = iov;
1638         rqst.rq_nvec = 2;
1639
1640         /* Need 64 for max size write so ask for more in case not there yet */
1641         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1642
1643         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1644         cifs_small_buf_release(req);
1645         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1646         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1647         if (rc != 0) {
1648                 if (tcon) {
1649                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1650                         tcon->need_reconnect = true;
1651                 }
1652                 goto tcon_error_exit;
1653         }
1654
1655         switch (rsp->ShareType) {
1656         case SMB2_SHARE_TYPE_DISK:
1657                 cifs_dbg(FYI, "connection to disk share\n");
1658                 break;
1659         case SMB2_SHARE_TYPE_PIPE:
1660                 tcon->pipe = true;
1661                 cifs_dbg(FYI, "connection to pipe share\n");
1662                 break;
1663         case SMB2_SHARE_TYPE_PRINT:
1664                 tcon->print = true;
1665                 cifs_dbg(FYI, "connection to printer\n");
1666                 break;
1667         default:
1668                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1669                 rc = -EOPNOTSUPP;
1670                 goto tcon_error_exit;
1671         }
1672
1673         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1674         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1675         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1676         tcon->tidStatus = CifsGood;
1677         tcon->need_reconnect = false;
1678         tcon->tid = rsp->sync_hdr.TreeId;
1679         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1680
1681         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1682             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1683                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1684
1685         if (tcon->seal &&
1686             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1687                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1688
1689         init_copy_chunk_defaults(tcon);
1690         if (tcon->ses->server->ops->validate_negotiate)
1691                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1692 tcon_exit:
1693
1694         free_rsp_buf(resp_buftype, rsp);
1695         kfree(unc_path);
1696         return rc;
1697
1698 tcon_error_exit:
1699         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1700                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1701         }
1702         goto tcon_exit;
1703 }
1704
1705 int
1706 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1707 {
1708         struct smb_rqst rqst;
1709         struct smb2_tree_disconnect_req *req; /* response is trivial */
1710         int rc = 0;
1711         struct cifs_ses *ses = tcon->ses;
1712         int flags = 0;
1713         unsigned int total_len;
1714         struct kvec iov[1];
1715         struct kvec rsp_iov;
1716         int resp_buf_type;
1717
1718         cifs_dbg(FYI, "Tree Disconnect\n");
1719
1720         if (!ses || !(ses->server))
1721                 return -EIO;
1722
1723         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1724                 return 0;
1725
1726         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1727                              &total_len);
1728         if (rc)
1729                 return rc;
1730
1731         if (smb3_encryption_required(tcon))
1732                 flags |= CIFS_TRANSFORM_REQ;
1733
1734         flags |= CIFS_NO_RESP;
1735
1736         iov[0].iov_base = (char *)req;
1737         iov[0].iov_len = total_len;
1738
1739         memset(&rqst, 0, sizeof(struct smb_rqst));
1740         rqst.rq_iov = iov;
1741         rqst.rq_nvec = 1;
1742
1743         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1744         cifs_small_buf_release(req);
1745         if (rc)
1746                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1747
1748         return rc;
1749 }
1750
1751
1752 static struct create_durable *
1753 create_durable_buf(void)
1754 {
1755         struct create_durable *buf;
1756
1757         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1758         if (!buf)
1759                 return NULL;
1760
1761         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1762                                         (struct create_durable, Data));
1763         buf->ccontext.DataLength = cpu_to_le32(16);
1764         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1765                                 (struct create_durable, Name));
1766         buf->ccontext.NameLength = cpu_to_le16(4);
1767         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1768         buf->Name[0] = 'D';
1769         buf->Name[1] = 'H';
1770         buf->Name[2] = 'n';
1771         buf->Name[3] = 'Q';
1772         return buf;
1773 }
1774
1775 static struct create_durable *
1776 create_reconnect_durable_buf(struct cifs_fid *fid)
1777 {
1778         struct create_durable *buf;
1779
1780         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1781         if (!buf)
1782                 return NULL;
1783
1784         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1785                                         (struct create_durable, Data));
1786         buf->ccontext.DataLength = cpu_to_le32(16);
1787         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1788                                 (struct create_durable, Name));
1789         buf->ccontext.NameLength = cpu_to_le16(4);
1790         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1791         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1792         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1793         buf->Name[0] = 'D';
1794         buf->Name[1] = 'H';
1795         buf->Name[2] = 'n';
1796         buf->Name[3] = 'C';
1797         return buf;
1798 }
1799
1800 __u8
1801 smb2_parse_lease_state(struct TCP_Server_Info *server,
1802                        struct smb2_create_rsp *rsp,
1803                        unsigned int *epoch, char *lease_key)
1804 {
1805         char *data_offset;
1806         struct create_context *cc;
1807         unsigned int next;
1808         unsigned int remaining;
1809         char *name;
1810
1811         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1812         remaining = le32_to_cpu(rsp->CreateContextsLength);
1813         cc = (struct create_context *)data_offset;
1814         while (remaining >= sizeof(struct create_context)) {
1815                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1816                 if (le16_to_cpu(cc->NameLength) == 4 &&
1817                     strncmp(name, "RqLs", 4) == 0)
1818                         return server->ops->parse_lease_buf(cc, epoch,
1819                                                             lease_key);
1820
1821                 next = le32_to_cpu(cc->Next);
1822                 if (!next)
1823                         break;
1824                 remaining -= next;
1825                 cc = (struct create_context *)((char *)cc + next);
1826         }
1827
1828         return 0;
1829 }
1830
1831 static int
1832 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1833                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1834 {
1835         struct smb2_create_req *req = iov[0].iov_base;
1836         unsigned int num = *num_iovec;
1837
1838         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1839         if (iov[num].iov_base == NULL)
1840                 return -ENOMEM;
1841         iov[num].iov_len = server->vals->create_lease_size;
1842         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1843         if (!req->CreateContextsOffset)
1844                 req->CreateContextsOffset = cpu_to_le32(
1845                                 sizeof(struct smb2_create_req) +
1846                                 iov[num - 1].iov_len);
1847         le32_add_cpu(&req->CreateContextsLength,
1848                      server->vals->create_lease_size);
1849         *num_iovec = num + 1;
1850         return 0;
1851 }
1852
1853 static struct create_durable_v2 *
1854 create_durable_v2_buf(struct cifs_fid *pfid)
1855 {
1856         struct create_durable_v2 *buf;
1857
1858         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1859         if (!buf)
1860                 return NULL;
1861
1862         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1863                                         (struct create_durable_v2, dcontext));
1864         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1865         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1866                                 (struct create_durable_v2, Name));
1867         buf->ccontext.NameLength = cpu_to_le16(4);
1868
1869         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1870         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1871         generate_random_uuid(buf->dcontext.CreateGuid);
1872         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1873
1874         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1875         buf->Name[0] = 'D';
1876         buf->Name[1] = 'H';
1877         buf->Name[2] = '2';
1878         buf->Name[3] = 'Q';
1879         return buf;
1880 }
1881
1882 static struct create_durable_handle_reconnect_v2 *
1883 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1884 {
1885         struct create_durable_handle_reconnect_v2 *buf;
1886
1887         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1888                         GFP_KERNEL);
1889         if (!buf)
1890                 return NULL;
1891
1892         buf->ccontext.DataOffset =
1893                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1894                                      dcontext));
1895         buf->ccontext.DataLength =
1896                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1897         buf->ccontext.NameOffset =
1898                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1899                             Name));
1900         buf->ccontext.NameLength = cpu_to_le16(4);
1901
1902         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1903         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1904         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1905         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1906
1907         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1908         buf->Name[0] = 'D';
1909         buf->Name[1] = 'H';
1910         buf->Name[2] = '2';
1911         buf->Name[3] = 'C';
1912         return buf;
1913 }
1914
1915 static int
1916 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1917                     struct cifs_open_parms *oparms)
1918 {
1919         struct smb2_create_req *req = iov[0].iov_base;
1920         unsigned int num = *num_iovec;
1921
1922         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1923         if (iov[num].iov_base == NULL)
1924                 return -ENOMEM;
1925         iov[num].iov_len = sizeof(struct create_durable_v2);
1926         if (!req->CreateContextsOffset)
1927                 req->CreateContextsOffset =
1928                         cpu_to_le32(sizeof(struct smb2_create_req) +
1929                                                                 iov[1].iov_len);
1930         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1931         *num_iovec = num + 1;
1932         return 0;
1933 }
1934
1935 static int
1936 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1937                     struct cifs_open_parms *oparms)
1938 {
1939         struct smb2_create_req *req = iov[0].iov_base;
1940         unsigned int num = *num_iovec;
1941
1942         /* indicate that we don't need to relock the file */
1943         oparms->reconnect = false;
1944
1945         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1946         if (iov[num].iov_base == NULL)
1947                 return -ENOMEM;
1948         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1949         if (!req->CreateContextsOffset)
1950                 req->CreateContextsOffset =
1951                         cpu_to_le32(sizeof(struct smb2_create_req) +
1952                                                                 iov[1].iov_len);
1953         le32_add_cpu(&req->CreateContextsLength,
1954                         sizeof(struct create_durable_handle_reconnect_v2));
1955         *num_iovec = num + 1;
1956         return 0;
1957 }
1958
1959 static int
1960 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1961                     struct cifs_open_parms *oparms, bool use_persistent)
1962 {
1963         struct smb2_create_req *req = iov[0].iov_base;
1964         unsigned int num = *num_iovec;
1965
1966         if (use_persistent) {
1967                 if (oparms->reconnect)
1968                         return add_durable_reconnect_v2_context(iov, num_iovec,
1969                                                                 oparms);
1970                 else
1971                         return add_durable_v2_context(iov, num_iovec, oparms);
1972         }
1973
1974         if (oparms->reconnect) {
1975                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1976                 /* indicate that we don't need to relock the file */
1977                 oparms->reconnect = false;
1978         } else
1979                 iov[num].iov_base = create_durable_buf();
1980         if (iov[num].iov_base == NULL)
1981                 return -ENOMEM;
1982         iov[num].iov_len = sizeof(struct create_durable);
1983         if (!req->CreateContextsOffset)
1984                 req->CreateContextsOffset =
1985                         cpu_to_le32(sizeof(struct smb2_create_req) +
1986                                                                 iov[1].iov_len);
1987         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1988         *num_iovec = num + 1;
1989         return 0;
1990 }
1991
1992 /* See MS-SMB2 2.2.13.2.7 */
1993 static struct crt_twarp_ctxt *
1994 create_twarp_buf(__u64 timewarp)
1995 {
1996         struct crt_twarp_ctxt *buf;
1997
1998         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
1999         if (!buf)
2000                 return NULL;
2001
2002         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2003                                         (struct crt_twarp_ctxt, Timestamp));
2004         buf->ccontext.DataLength = cpu_to_le32(8);
2005         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2006                                 (struct crt_twarp_ctxt, Name));
2007         buf->ccontext.NameLength = cpu_to_le16(4);
2008         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2009         buf->Name[0] = 'T';
2010         buf->Name[1] = 'W';
2011         buf->Name[2] = 'r';
2012         buf->Name[3] = 'p';
2013         buf->Timestamp = cpu_to_le64(timewarp);
2014         return buf;
2015 }
2016
2017 /* See MS-SMB2 2.2.13.2.7 */
2018 static int
2019 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2020 {
2021         struct smb2_create_req *req = iov[0].iov_base;
2022         unsigned int num = *num_iovec;
2023
2024         iov[num].iov_base = create_twarp_buf(timewarp);
2025         if (iov[num].iov_base == NULL)
2026                 return -ENOMEM;
2027         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2028         if (!req->CreateContextsOffset)
2029                 req->CreateContextsOffset = cpu_to_le32(
2030                                 sizeof(struct smb2_create_req) +
2031                                 iov[num - 1].iov_len);
2032         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2033         *num_iovec = num + 1;
2034         return 0;
2035 }
2036
2037 static int
2038 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2039                             const char *treename, const __le16 *path)
2040 {
2041         int treename_len, path_len;
2042         struct nls_table *cp;
2043         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2044
2045         /*
2046          * skip leading "\\"
2047          */
2048         treename_len = strlen(treename);
2049         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2050                 return -EINVAL;
2051
2052         treename += 2;
2053         treename_len -= 2;
2054
2055         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2056
2057         /*
2058          * make room for one path separator between the treename and
2059          * path
2060          */
2061         *out_len = treename_len + 1 + path_len;
2062
2063         /*
2064          * final path needs to be null-terminated UTF16 with a
2065          * size aligned to 8
2066          */
2067
2068         *out_size = roundup((*out_len+1)*2, 8);
2069         *out_path = kzalloc(*out_size, GFP_KERNEL);
2070         if (!*out_path)
2071                 return -ENOMEM;
2072
2073         cp = load_nls_default();
2074         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2075         UniStrcat(*out_path, sep);
2076         UniStrcat(*out_path, path);
2077         unload_nls(cp);
2078
2079         return 0;
2080 }
2081
2082 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2083                                umode_t mode, struct cifs_tcon *tcon,
2084                                const char *full_path,
2085                                struct cifs_sb_info *cifs_sb)
2086 {
2087         struct smb_rqst rqst;
2088         struct smb2_create_req *req;
2089         struct smb2_create_rsp *rsp = NULL;
2090         struct cifs_ses *ses = tcon->ses;
2091         struct kvec iov[3]; /* make sure at least one for each open context */
2092         struct kvec rsp_iov = {NULL, 0};
2093         int resp_buftype;
2094         int uni_path_len;
2095         __le16 *copy_path = NULL;
2096         int copy_size;
2097         int rc = 0;
2098         unsigned int n_iov = 2;
2099         __u32 file_attributes = 0;
2100         char *pc_buf = NULL;
2101         int flags = 0;
2102         unsigned int total_len;
2103         __le16 *utf16_path = NULL;
2104
2105         cifs_dbg(FYI, "mkdir\n");
2106
2107         /* resource #1: path allocation */
2108         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2109         if (!utf16_path)
2110                 return -ENOMEM;
2111
2112         if (!ses || !(ses->server)) {
2113                 rc = -EIO;
2114                 goto err_free_path;
2115         }
2116
2117         /* resource #2: request */
2118         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2119         if (rc)
2120                 goto err_free_path;
2121
2122
2123         if (smb3_encryption_required(tcon))
2124                 flags |= CIFS_TRANSFORM_REQ;
2125
2126         req->ImpersonationLevel = IL_IMPERSONATION;
2127         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2128         /* File attributes ignored on open (used in create though) */
2129         req->FileAttributes = cpu_to_le32(file_attributes);
2130         req->ShareAccess = FILE_SHARE_ALL_LE;
2131         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2132         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2133
2134         iov[0].iov_base = (char *)req;
2135         /* -1 since last byte is buf[0] which is sent below (path) */
2136         iov[0].iov_len = total_len - 1;
2137
2138         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2139
2140         /* [MS-SMB2] 2.2.13 NameOffset:
2141          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2142          * the SMB2 header, the file name includes a prefix that will
2143          * be processed during DFS name normalization as specified in
2144          * section 3.3.5.9. Otherwise, the file name is relative to
2145          * the share that is identified by the TreeId in the SMB2
2146          * header.
2147          */
2148         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2149                 int name_len;
2150
2151                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2152                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2153                                                  &name_len,
2154                                                  tcon->treeName, utf16_path);
2155                 if (rc)
2156                         goto err_free_req;
2157
2158                 req->NameLength = cpu_to_le16(name_len * 2);
2159                 uni_path_len = copy_size;
2160                 /* free before overwriting resource */
2161                 kfree(utf16_path);
2162                 utf16_path = copy_path;
2163         } else {
2164                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2165                 /* MUST set path len (NameLength) to 0 opening root of share */
2166                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2167                 if (uni_path_len % 8 != 0) {
2168                         copy_size = roundup(uni_path_len, 8);
2169                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2170                         if (!copy_path) {
2171                                 rc = -ENOMEM;
2172                                 goto err_free_req;
2173                         }
2174                         memcpy((char *)copy_path, (const char *)utf16_path,
2175                                uni_path_len);
2176                         uni_path_len = copy_size;
2177                         /* free before overwriting resource */
2178                         kfree(utf16_path);
2179                         utf16_path = copy_path;
2180                 }
2181         }
2182
2183         iov[1].iov_len = uni_path_len;
2184         iov[1].iov_base = utf16_path;
2185         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2186
2187         if (tcon->posix_extensions) {
2188                 /* resource #3: posix buf */
2189                 rc = add_posix_context(iov, &n_iov, mode);
2190                 if (rc)
2191                         goto err_free_req;
2192                 pc_buf = iov[n_iov-1].iov_base;
2193         }
2194
2195
2196         memset(&rqst, 0, sizeof(struct smb_rqst));
2197         rqst.rq_iov = iov;
2198         rqst.rq_nvec = n_iov;
2199
2200         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2201                                     FILE_WRITE_ATTRIBUTES);
2202         /* resource #4: response buffer */
2203         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2204         if (rc) {
2205                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2206                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2207                                            CREATE_NOT_FILE,
2208                                            FILE_WRITE_ATTRIBUTES, rc);
2209                 goto err_free_rsp_buf;
2210         }
2211
2212         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2213         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2214                                     ses->Suid, CREATE_NOT_FILE,
2215                                     FILE_WRITE_ATTRIBUTES);
2216
2217         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2218
2219         /* Eventually save off posix specific response info and timestaps */
2220
2221 err_free_rsp_buf:
2222         free_rsp_buf(resp_buftype, rsp);
2223         kfree(pc_buf);
2224 err_free_req:
2225         cifs_small_buf_release(req);
2226 err_free_path:
2227         kfree(utf16_path);
2228         return rc;
2229 }
2230
2231 int
2232 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2233                struct cifs_open_parms *oparms, __le16 *path)
2234 {
2235         struct TCP_Server_Info *server = tcon->ses->server;
2236         struct smb2_create_req *req;
2237         unsigned int n_iov = 2;
2238         __u32 file_attributes = 0;
2239         int copy_size;
2240         int uni_path_len;
2241         unsigned int total_len;
2242         struct kvec *iov = rqst->rq_iov;
2243         __le16 *copy_path;
2244         int rc;
2245
2246         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2247         if (rc)
2248                 return rc;
2249
2250         iov[0].iov_base = (char *)req;
2251         /* -1 since last byte is buf[0] which is sent below (path) */
2252         iov[0].iov_len = total_len - 1;
2253
2254         if (oparms->create_options & CREATE_OPTION_READONLY)
2255                 file_attributes |= ATTR_READONLY;
2256         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2257                 file_attributes |= ATTR_SYSTEM;
2258
2259         req->ImpersonationLevel = IL_IMPERSONATION;
2260         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2261         /* File attributes ignored on open (used in create though) */
2262         req->FileAttributes = cpu_to_le32(file_attributes);
2263         req->ShareAccess = FILE_SHARE_ALL_LE;
2264         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2265         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2266         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2267
2268         /* [MS-SMB2] 2.2.13 NameOffset:
2269          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2270          * the SMB2 header, the file name includes a prefix that will
2271          * be processed during DFS name normalization as specified in
2272          * section 3.3.5.9. Otherwise, the file name is relative to
2273          * the share that is identified by the TreeId in the SMB2
2274          * header.
2275          */
2276         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2277                 int name_len;
2278
2279                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2280                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2281                                                  &name_len,
2282                                                  tcon->treeName, path);
2283                 if (rc)
2284                         return rc;
2285                 req->NameLength = cpu_to_le16(name_len * 2);
2286                 uni_path_len = copy_size;
2287                 path = copy_path;
2288         } else {
2289                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2290                 /* MUST set path len (NameLength) to 0 opening root of share */
2291                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2292                 copy_size = uni_path_len;
2293                 if (copy_size % 8 != 0)
2294                         copy_size = roundup(copy_size, 8);
2295                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2296                 if (!copy_path)
2297                         return -ENOMEM;
2298                 memcpy((char *)copy_path, (const char *)path,
2299                        uni_path_len);
2300                 uni_path_len = copy_size;
2301                 path = copy_path;
2302         }
2303
2304         iov[1].iov_len = uni_path_len;
2305         iov[1].iov_base = path;
2306
2307         if (!server->oplocks)
2308                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2309
2310         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2311             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2312                 req->RequestedOplockLevel = *oplock;
2313         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2314                   (oparms->create_options & CREATE_NOT_FILE))
2315                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2316         else {
2317                 rc = add_lease_context(server, iov, &n_iov,
2318                                        oparms->fid->lease_key, oplock);
2319                 if (rc)
2320                         return rc;
2321         }
2322
2323         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2324                 /* need to set Next field of lease context if we request it */
2325                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2326                         struct create_context *ccontext =
2327                             (struct create_context *)iov[n_iov-1].iov_base;
2328                         ccontext->Next =
2329                                 cpu_to_le32(server->vals->create_lease_size);
2330                 }
2331
2332                 rc = add_durable_context(iov, &n_iov, oparms,
2333                                         tcon->use_persistent);
2334                 if (rc)
2335                         return rc;
2336         }
2337
2338         if (tcon->posix_extensions) {
2339                 if (n_iov > 2) {
2340                         struct create_context *ccontext =
2341                             (struct create_context *)iov[n_iov-1].iov_base;
2342                         ccontext->Next =
2343                                 cpu_to_le32(iov[n_iov-1].iov_len);
2344                 }
2345
2346                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2347                 if (rc)
2348                         return rc;
2349         }
2350
2351         if (tcon->snapshot_time) {
2352                 cifs_dbg(FYI, "adding snapshot context\n");
2353                 if (n_iov > 2) {
2354                         struct create_context *ccontext =
2355                             (struct create_context *)iov[n_iov-1].iov_base;
2356                         ccontext->Next =
2357                                 cpu_to_le32(iov[n_iov-1].iov_len);
2358                 }
2359
2360                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2361                 if (rc)
2362                         return rc;
2363         }
2364
2365
2366         rqst->rq_nvec = n_iov;
2367         return 0;
2368 }
2369
2370 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2371  * All other vectors are freed by kfree().
2372  */
2373 void
2374 SMB2_open_free(struct smb_rqst *rqst)
2375 {
2376         int i;
2377
2378         if (rqst && rqst->rq_iov) {
2379                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2380                 for (i = 1; i < rqst->rq_nvec; i++)
2381                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2382                                 kfree(rqst->rq_iov[i].iov_base);
2383         }
2384 }
2385
2386 int
2387 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2388           __u8 *oplock, struct smb2_file_all_info *buf,
2389           struct kvec *err_iov, int *buftype)
2390 {
2391         struct smb_rqst rqst;
2392         struct smb2_create_rsp *rsp = NULL;
2393         struct TCP_Server_Info *server;
2394         struct cifs_tcon *tcon = oparms->tcon;
2395         struct cifs_ses *ses = tcon->ses;
2396         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2397         struct kvec rsp_iov = {NULL, 0};
2398         int resp_buftype = CIFS_NO_BUFFER;
2399         int rc = 0;
2400         int flags = 0;
2401
2402         cifs_dbg(FYI, "create/open\n");
2403         if (ses && (ses->server))
2404                 server = ses->server;
2405         else
2406                 return -EIO;
2407
2408         if (smb3_encryption_required(tcon))
2409                 flags |= CIFS_TRANSFORM_REQ;
2410
2411         memset(&rqst, 0, sizeof(struct smb_rqst));
2412         memset(&iov, 0, sizeof(iov));
2413         rqst.rq_iov = iov;
2414         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2415
2416         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2417         if (rc)
2418                 goto creat_exit;
2419
2420         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2421                 oparms->create_options, oparms->desired_access);
2422
2423         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2424                             &rsp_iov);
2425         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2426
2427         if (rc != 0) {
2428                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2429                 if (err_iov && rsp) {
2430                         *err_iov = rsp_iov;
2431                         *buftype = resp_buftype;
2432                         resp_buftype = CIFS_NO_BUFFER;
2433                         rsp = NULL;
2434                 }
2435                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2436                                     oparms->create_options, oparms->desired_access, rc);
2437                 goto creat_exit;
2438         } else
2439                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2440                                      ses->Suid, oparms->create_options,
2441                                      oparms->desired_access);
2442
2443         atomic_inc(&tcon->num_remote_opens);
2444         oparms->fid->persistent_fid = rsp->PersistentFileId;
2445         oparms->fid->volatile_fid = rsp->VolatileFileId;
2446 #ifdef CONFIG_CIFS_DEBUG2
2447         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2448 #endif /* CIFS_DEBUG2 */
2449
2450         if (buf) {
2451                 memcpy(buf, &rsp->CreationTime, 32);
2452                 buf->AllocationSize = rsp->AllocationSize;
2453                 buf->EndOfFile = rsp->EndofFile;
2454                 buf->Attributes = rsp->FileAttributes;
2455                 buf->NumberOfLinks = cpu_to_le32(1);
2456                 buf->DeletePending = 0;
2457         }
2458
2459         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
2460                 *oplock = smb2_parse_lease_state(server, rsp,
2461                                                  &oparms->fid->epoch,
2462                                                  oparms->fid->lease_key);
2463         else
2464                 *oplock = rsp->OplockLevel;
2465 creat_exit:
2466         SMB2_open_free(&rqst);
2467         free_rsp_buf(resp_buftype, rsp);
2468         return rc;
2469 }
2470
2471 int
2472 SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2473                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2474                 bool is_fsctl, char *in_data, u32 indatalen)
2475 {
2476         struct smb2_ioctl_req *req;
2477         struct kvec *iov = rqst->rq_iov;
2478         unsigned int total_len;
2479         int rc;
2480
2481         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2482         if (rc)
2483                 return rc;
2484
2485         req->CtlCode = cpu_to_le32(opcode);
2486         req->PersistentFileId = persistent_fid;
2487         req->VolatileFileId = volatile_fid;
2488
2489         iov[0].iov_base = (char *)req;
2490         /*
2491          * If no input data, the size of ioctl struct in
2492          * protocol spec still includes a 1 byte data buffer,
2493          * but if input data passed to ioctl, we do not
2494          * want to double count this, so we do not send
2495          * the dummy one byte of data in iovec[0] if sending
2496          * input data (in iovec[1]).
2497          */
2498         if (indatalen) {
2499                 req->InputCount = cpu_to_le32(indatalen);
2500                 /* do not set InputOffset if no input data */
2501                 req->InputOffset =
2502                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2503                 rqst->rq_nvec = 2;
2504                 iov[0].iov_len = total_len - 1;
2505                 iov[1].iov_base = in_data;
2506                 iov[1].iov_len = indatalen;
2507         } else {
2508                 rqst->rq_nvec = 1;
2509                 iov[0].iov_len = total_len;
2510         }
2511
2512         req->OutputOffset = 0;
2513         req->OutputCount = 0; /* MBZ */
2514
2515         /*
2516          * Could increase MaxOutputResponse, but that would require more
2517          * than one credit. Windows typically sets this smaller, but for some
2518          * ioctls it may be useful to allow server to send more. No point
2519          * limiting what the server can send as long as fits in one credit
2520          * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
2521          * (by default, note that it can be overridden to make max larger)
2522          * in responses (except for read responses which can be bigger.
2523          * We may want to bump this limit up
2524          */
2525         req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
2526
2527         if (is_fsctl)
2528                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2529         else
2530                 req->Flags = 0;
2531
2532         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2533         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2534                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2535
2536         return 0;
2537 }
2538
2539 void
2540 SMB2_ioctl_free(struct smb_rqst *rqst)
2541 {
2542         if (rqst && rqst->rq_iov)
2543                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2544 }
2545
2546 /*
2547  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2548  */
2549 int
2550 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2551            u64 volatile_fid, u32 opcode, bool is_fsctl,
2552            char *in_data, u32 indatalen,
2553            char **out_data, u32 *plen /* returned data len */)
2554 {
2555         struct smb_rqst rqst;
2556         struct smb2_ioctl_rsp *rsp = NULL;
2557         struct cifs_ses *ses;
2558         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
2559         struct kvec rsp_iov = {NULL, 0};
2560         int resp_buftype = CIFS_NO_BUFFER;
2561         int rc = 0;
2562         int flags = 0;
2563
2564         cifs_dbg(FYI, "SMB2 IOCTL\n");
2565
2566         if (out_data != NULL)
2567                 *out_data = NULL;
2568
2569         /* zero out returned data len, in case of error */
2570         if (plen)
2571                 *plen = 0;
2572
2573         if (tcon)
2574                 ses = tcon->ses;
2575         else
2576                 return -EIO;
2577
2578         if (!ses || !(ses->server))
2579                 return -EIO;
2580
2581         if (smb3_encryption_required(tcon))
2582                 flags |= CIFS_TRANSFORM_REQ;
2583
2584         memset(&rqst, 0, sizeof(struct smb_rqst));
2585         memset(&iov, 0, sizeof(iov));
2586         rqst.rq_iov = iov;
2587         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
2588
2589         rc = SMB2_ioctl_init(tcon, &rqst, persistent_fid, volatile_fid,
2590                              opcode, is_fsctl, in_data, indatalen);
2591         if (rc)
2592                 goto ioctl_exit;
2593
2594         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2595                             &rsp_iov);
2596         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2597
2598         if (rc != 0)
2599                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2600                                 ses->Suid, 0, opcode, rc);
2601
2602         if ((rc != 0) && (rc != -EINVAL)) {
2603                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2604                 goto ioctl_exit;
2605         } else if (rc == -EINVAL) {
2606                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2607                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2608                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2609                         goto ioctl_exit;
2610                 }
2611         }
2612
2613         /* check if caller wants to look at return data or just return rc */
2614         if ((plen == NULL) || (out_data == NULL))
2615                 goto ioctl_exit;
2616
2617         *plen = le32_to_cpu(rsp->OutputCount);
2618
2619         /* We check for obvious errors in the output buffer length and offset */
2620         if (*plen == 0)
2621                 goto ioctl_exit; /* server returned no data */
2622         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
2623                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2624                 *plen = 0;
2625                 rc = -EIO;
2626                 goto ioctl_exit;
2627         }
2628
2629         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
2630                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2631                         le32_to_cpu(rsp->OutputOffset));
2632                 *plen = 0;
2633                 rc = -EIO;
2634                 goto ioctl_exit;
2635         }
2636
2637         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
2638                             *plen, GFP_KERNEL);
2639         if (*out_data == NULL) {
2640                 rc = -ENOMEM;
2641                 goto ioctl_exit;
2642         }
2643
2644 ioctl_exit:
2645         SMB2_ioctl_free(&rqst);
2646         free_rsp_buf(resp_buftype, rsp);
2647         return rc;
2648 }
2649
2650 /*
2651  *   Individual callers to ioctl worker function follow
2652  */
2653
2654 int
2655 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2656                      u64 persistent_fid, u64 volatile_fid)
2657 {
2658         int rc;
2659         struct  compress_ioctl fsctl_input;
2660         char *ret_data = NULL;
2661
2662         fsctl_input.CompressionState =
2663                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2664
2665         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2666                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2667                         (char *)&fsctl_input /* data input */,
2668                         2 /* in data len */, &ret_data /* out data */, NULL);
2669
2670         cifs_dbg(FYI, "set compression rc %d\n", rc);
2671
2672         return rc;
2673 }
2674
2675 int
2676 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2677                 u64 persistent_fid, u64 volatile_fid)
2678 {
2679         struct smb2_close_req *req;
2680         struct kvec *iov = rqst->rq_iov;
2681         unsigned int total_len;
2682         int rc;
2683
2684         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2685         if (rc)
2686                 return rc;
2687
2688         req->PersistentFileId = persistent_fid;
2689         req->VolatileFileId = volatile_fid;
2690         iov[0].iov_base = (char *)req;
2691         iov[0].iov_len = total_len;
2692
2693         return 0;
2694 }
2695
2696 void
2697 SMB2_close_free(struct smb_rqst *rqst)
2698 {
2699         if (rqst && rqst->rq_iov)
2700                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2701 }
2702
2703 int
2704 SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2705                  u64 persistent_fid, u64 volatile_fid, int flags)
2706 {
2707         struct smb_rqst rqst;
2708         struct smb2_close_rsp *rsp = NULL;
2709         struct cifs_ses *ses = tcon->ses;
2710         struct kvec iov[1];
2711         struct kvec rsp_iov;
2712         int resp_buftype = CIFS_NO_BUFFER;
2713         int rc = 0;
2714
2715         cifs_dbg(FYI, "Close\n");
2716
2717         if (!ses || !(ses->server))
2718                 return -EIO;
2719
2720         if (smb3_encryption_required(tcon))
2721                 flags |= CIFS_TRANSFORM_REQ;
2722
2723         memset(&rqst, 0, sizeof(struct smb_rqst));
2724         memset(&iov, 0, sizeof(iov));
2725         rqst.rq_iov = iov;
2726         rqst.rq_nvec = 1;
2727
2728         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
2729         if (rc)
2730                 goto close_exit;
2731
2732         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2733         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2734
2735         if (rc != 0) {
2736                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2737                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2738                                      rc);
2739                 goto close_exit;
2740         }
2741
2742         atomic_dec(&tcon->num_remote_opens);
2743
2744         /* BB FIXME - decode close response, update inode for caching */
2745
2746 close_exit:
2747         SMB2_close_free(&rqst);
2748         free_rsp_buf(resp_buftype, rsp);
2749         return rc;
2750 }
2751
2752 int
2753 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2754            u64 persistent_fid, u64 volatile_fid)
2755 {
2756         return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2757 }
2758
2759 int
2760 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
2761                   struct kvec *iov, unsigned int min_buf_size)
2762 {
2763         unsigned int smb_len = iov->iov_len;
2764         char *end_of_smb = smb_len + (char *)iov->iov_base;
2765         char *begin_of_buf = offset + (char *)iov->iov_base;
2766         char *end_of_buf = begin_of_buf + buffer_length;
2767
2768
2769         if (buffer_length < min_buf_size) {
2770                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2771                          buffer_length, min_buf_size);
2772                 return -EINVAL;
2773         }
2774
2775         /* check if beyond RFC1001 maximum length */
2776         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2777                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2778                          buffer_length, smb_len);
2779                 return -EINVAL;
2780         }
2781
2782         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2783                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2784                 return -EINVAL;
2785         }
2786
2787         return 0;
2788 }
2789
2790 /*
2791  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2792  * Caller must free buffer.
2793  */
2794 int
2795 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
2796                            struct kvec *iov, unsigned int minbufsize,
2797                            char *data)
2798 {
2799         char *begin_of_buf = offset + (char *)iov->iov_base;
2800         int rc;
2801
2802         if (!data)
2803                 return -EINVAL;
2804
2805         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
2806         if (rc)
2807                 return rc;
2808
2809         memcpy(data, begin_of_buf, buffer_length);
2810
2811         return 0;
2812 }
2813
2814 int
2815 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2816                      u64 persistent_fid, u64 volatile_fid,
2817                      u8 info_class, u8 info_type, u32 additional_info,
2818                      size_t output_len, size_t input_len, void *input)
2819 {
2820         struct smb2_query_info_req *req;
2821         struct kvec *iov = rqst->rq_iov;
2822         unsigned int total_len;
2823         int rc;
2824
2825         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2826                              &total_len);
2827         if (rc)
2828                 return rc;
2829
2830         req->InfoType = info_type;
2831         req->FileInfoClass = info_class;
2832         req->PersistentFileId = persistent_fid;
2833         req->VolatileFileId = volatile_fid;
2834         req->AdditionalInformation = cpu_to_le32(additional_info);
2835
2836         req->OutputBufferLength = cpu_to_le32(output_len);
2837         if (input_len) {
2838                 req->InputBufferLength = cpu_to_le32(input_len);
2839                 /* total_len for smb query request never close to le16 max */
2840                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
2841                 memcpy(req->Buffer, input, input_len);
2842         }
2843
2844         iov[0].iov_base = (char *)req;
2845         /* 1 for Buffer */
2846         iov[0].iov_len = total_len - 1 + input_len;
2847         return 0;
2848 }
2849
2850 void
2851 SMB2_query_info_free(struct smb_rqst *rqst)
2852 {
2853         if (rqst && rqst->rq_iov)
2854                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2855 }
2856
2857 static int
2858 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2859            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2860            u32 additional_info, size_t output_len, size_t min_len, void **data,
2861                 u32 *dlen)
2862 {
2863         struct smb_rqst rqst;
2864         struct smb2_query_info_rsp *rsp = NULL;
2865         struct kvec iov[1];
2866         struct kvec rsp_iov;
2867         int rc = 0;
2868         int resp_buftype = CIFS_NO_BUFFER;
2869         struct cifs_ses *ses = tcon->ses;
2870         int flags = 0;
2871         bool allocated = false;
2872
2873         cifs_dbg(FYI, "Query Info\n");
2874
2875         if (!ses || !(ses->server))
2876                 return -EIO;
2877
2878         if (smb3_encryption_required(tcon))
2879                 flags |= CIFS_TRANSFORM_REQ;
2880
2881         memset(&rqst, 0, sizeof(struct smb_rqst));
2882         memset(&iov, 0, sizeof(iov));
2883         rqst.rq_iov = iov;
2884         rqst.rq_nvec = 1;
2885
2886         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
2887                                   info_class, info_type, additional_info,
2888                                   output_len, 0, NULL);
2889         if (rc)
2890                 goto qinf_exit;
2891
2892         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
2893                                     ses->Suid, info_class, (__u32)info_type);
2894
2895         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2896         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2897
2898         if (rc) {
2899                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2900                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
2901                                 ses->Suid, info_class, (__u32)info_type, rc);
2902                 goto qinf_exit;
2903         }
2904
2905         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
2906                                 ses->Suid, info_class, (__u32)info_type);
2907
2908         if (dlen) {
2909                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2910                 if (!*data) {
2911                         *data = kmalloc(*dlen, GFP_KERNEL);
2912                         if (!*data) {
2913                                 cifs_dbg(VFS,
2914                                         "Error %d allocating memory for acl\n",
2915                                         rc);
2916                                 *dlen = 0;
2917                                 rc = -ENOMEM;
2918                                 goto qinf_exit;
2919                         }
2920                         allocated = true;
2921                 }
2922         }
2923
2924         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
2925                                         le32_to_cpu(rsp->OutputBufferLength),
2926                                         &rsp_iov, min_len, *data);
2927         if (rc && allocated) {
2928                 kfree(*data);
2929                 *data = NULL;
2930                 *dlen = 0;
2931         }
2932
2933 qinf_exit:
2934         SMB2_query_info_free(&rqst);
2935         free_rsp_buf(resp_buftype, rsp);
2936         return rc;
2937 }
2938
2939 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2940         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2941 {
2942         return query_info(xid, tcon, persistent_fid, volatile_fid,
2943                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2944                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2945                           sizeof(struct smb2_file_all_info), (void **)&data,
2946                           NULL);
2947 }
2948
2949 int
2950 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2951                 u64 persistent_fid, u64 volatile_fid,
2952                 void **data, u32 *plen)
2953 {
2954         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2955         *plen = 0;
2956
2957         return query_info(xid, tcon, persistent_fid, volatile_fid,
2958                           0, SMB2_O_INFO_SECURITY, additional_info,
2959                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
2960 }
2961
2962 int
2963 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2964                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2965 {
2966         return query_info(xid, tcon, persistent_fid, volatile_fid,
2967                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2968                           sizeof(struct smb2_file_internal_info),
2969                           sizeof(struct smb2_file_internal_info),
2970                           (void **)&uniqueid, NULL);
2971 }
2972
2973 /*
2974  * This is a no-op for now. We're not really interested in the reply, but
2975  * rather in the fact that the server sent one and that server->lstrp
2976  * gets updated.
2977  *
2978  * FIXME: maybe we should consider checking that the reply matches request?
2979  */
2980 static void
2981 smb2_echo_callback(struct mid_q_entry *mid)
2982 {
2983         struct TCP_Server_Info *server = mid->callback_data;
2984         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2985         struct cifs_credits credits = { .value = 0, .instance = 0 };
2986
2987         if (mid->mid_state == MID_RESPONSE_RECEIVED
2988             || mid->mid_state == MID_RESPONSE_MALFORMED) {
2989                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
2990                 credits.instance = server->reconnect_instance;
2991         }
2992
2993         DeleteMidQEntry(mid);
2994         add_credits(server, &credits, CIFS_ECHO_OP);
2995 }
2996
2997 void smb2_reconnect_server(struct work_struct *work)
2998 {
2999         struct TCP_Server_Info *server = container_of(work,
3000                                         struct TCP_Server_Info, reconnect.work);
3001         struct cifs_ses *ses;
3002         struct cifs_tcon *tcon, *tcon2;
3003         struct list_head tmp_list;
3004         int tcon_exist = false;
3005         int rc;
3006         int resched = false;
3007
3008
3009         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3010         mutex_lock(&server->reconnect_mutex);
3011
3012         INIT_LIST_HEAD(&tmp_list);
3013         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3014
3015         spin_lock(&cifs_tcp_ses_lock);
3016         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3017                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3018                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3019                                 tcon->tc_count++;
3020                                 list_add_tail(&tcon->rlist, &tmp_list);
3021                                 tcon_exist = true;
3022                         }
3023                 }
3024                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3025                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3026                         tcon_exist = true;
3027                 }
3028         }
3029         /*
3030          * Get the reference to server struct to be sure that the last call of
3031          * cifs_put_tcon() in the loop below won't release the server pointer.
3032          */
3033         if (tcon_exist)
3034                 server->srv_count++;
3035
3036         spin_unlock(&cifs_tcp_ses_lock);
3037
3038         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3039                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
3040                 if (!rc)
3041                         cifs_reopen_persistent_handles(tcon);
3042                 else
3043                         resched = true;
3044                 list_del_init(&tcon->rlist);
3045                 cifs_put_tcon(tcon);
3046         }
3047
3048         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3049         if (resched)
3050                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3051         mutex_unlock(&server->reconnect_mutex);
3052
3053         /* now we can safely release srv struct */
3054         if (tcon_exist)
3055                 cifs_put_tcp_session(server, 1);
3056 }
3057
3058 int
3059 SMB2_echo(struct TCP_Server_Info *server)
3060 {
3061         struct smb2_echo_req *req;
3062         int rc = 0;
3063         struct kvec iov[1];
3064         struct smb_rqst rqst = { .rq_iov = iov,
3065                                  .rq_nvec = 1 };
3066         unsigned int total_len;
3067
3068         cifs_dbg(FYI, "In echo request\n");
3069
3070         if (server->tcpStatus == CifsNeedNegotiate) {
3071                 /* No need to send echo on newly established connections */
3072                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
3073                 return rc;
3074         }
3075
3076         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
3077         if (rc)
3078                 return rc;
3079
3080         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3081
3082         iov[0].iov_len = total_len;
3083         iov[0].iov_base = (char *)req;
3084
3085         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3086                              server, CIFS_ECHO_OP, NULL);
3087         if (rc)
3088                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3089
3090         cifs_small_buf_release(req);
3091         return rc;
3092 }
3093
3094 int
3095 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3096            u64 volatile_fid)
3097 {
3098         struct smb_rqst rqst;
3099         struct smb2_flush_req *req;
3100         struct cifs_ses *ses = tcon->ses;
3101         struct kvec iov[1];
3102         struct kvec rsp_iov;
3103         int resp_buftype;
3104         int rc = 0;
3105         int flags = 0;
3106         unsigned int total_len;
3107
3108         cifs_dbg(FYI, "Flush\n");
3109
3110         if (!ses || !(ses->server))
3111                 return -EIO;
3112
3113         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
3114         if (rc)
3115                 return rc;
3116
3117         if (smb3_encryption_required(tcon))
3118                 flags |= CIFS_TRANSFORM_REQ;
3119
3120         req->PersistentFileId = persistent_fid;
3121         req->VolatileFileId = volatile_fid;
3122
3123         iov[0].iov_base = (char *)req;
3124         iov[0].iov_len = total_len;
3125
3126         memset(&rqst, 0, sizeof(struct smb_rqst));
3127         rqst.rq_iov = iov;
3128         rqst.rq_nvec = 1;
3129
3130         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3131         cifs_small_buf_release(req);
3132
3133         if (rc != 0) {
3134                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3135                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3136                                      rc);
3137         }
3138
3139         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3140         return rc;
3141 }
3142
3143 /*
3144  * To form a chain of read requests, any read requests after the first should
3145  * have the end_of_chain boolean set to true.
3146  */
3147 static int
3148 smb2_new_read_req(void **buf, unsigned int *total_len,
3149         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3150         unsigned int remaining_bytes, int request_type)
3151 {
3152         int rc = -EACCES;
3153         struct smb2_read_plain_req *req = NULL;
3154         struct smb2_sync_hdr *shdr;
3155         struct TCP_Server_Info *server;
3156
3157         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
3158                                  total_len);
3159         if (rc)
3160                 return rc;
3161
3162         server = io_parms->tcon->ses->server;
3163         if (server == NULL)
3164                 return -ECONNABORTED;
3165
3166         shdr = &req->sync_hdr;
3167         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3168
3169         req->PersistentFileId = io_parms->persistent_fid;
3170         req->VolatileFileId = io_parms->volatile_fid;
3171         req->ReadChannelInfoOffset = 0; /* reserved */
3172         req->ReadChannelInfoLength = 0; /* reserved */
3173         req->Channel = 0; /* reserved */
3174         req->MinimumCount = 0;
3175         req->Length = cpu_to_le32(io_parms->length);
3176         req->Offset = cpu_to_le64(io_parms->offset);
3177
3178         trace_smb3_read_enter(0 /* xid */,
3179                         io_parms->persistent_fid,
3180                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3181                         io_parms->offset, io_parms->length);
3182 #ifdef CONFIG_CIFS_SMB_DIRECT
3183         /*
3184          * If we want to do a RDMA write, fill in and append
3185          * smbd_buffer_descriptor_v1 to the end of read request
3186          */
3187         if (server->rdma && rdata && !server->sign &&
3188                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3189
3190                 struct smbd_buffer_descriptor_v1 *v1;
3191                 bool need_invalidate =
3192                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3193
3194                 rdata->mr = smbd_register_mr(
3195                                 server->smbd_conn, rdata->pages,
3196                                 rdata->nr_pages, rdata->page_offset,
3197                                 rdata->tailsz, true, need_invalidate);
3198                 if (!rdata->mr)
3199                         return -ENOBUFS;
3200
3201                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3202                 if (need_invalidate)
3203                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3204                 req->ReadChannelInfoOffset =
3205                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3206                 req->ReadChannelInfoLength =
3207                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3208                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3209                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3210                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3211                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3212
3213                 *total_len += sizeof(*v1) - 1;
3214         }
3215 #endif
3216         if (request_type & CHAINED_REQUEST) {
3217                 if (!(request_type & END_OF_CHAIN)) {
3218                         /* next 8-byte aligned request */
3219                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3220                         shdr->NextCommand = cpu_to_le32(*total_len);
3221                 } else /* END_OF_CHAIN */
3222                         shdr->NextCommand = 0;
3223                 if (request_type & RELATED_REQUEST) {
3224                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3225                         /*
3226                          * Related requests use info from previous read request
3227                          * in chain.
3228                          */
3229                         shdr->SessionId = 0xFFFFFFFF;
3230                         shdr->TreeId = 0xFFFFFFFF;
3231                         req->PersistentFileId = 0xFFFFFFFF;
3232                         req->VolatileFileId = 0xFFFFFFFF;
3233                 }
3234         }
3235         if (remaining_bytes > io_parms->length)
3236                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3237         else
3238                 req->RemainingBytes = 0;
3239
3240         *buf = req;
3241         return rc;
3242 }
3243
3244 static void
3245 smb2_readv_callback(struct mid_q_entry *mid)
3246 {
3247         struct cifs_readdata *rdata = mid->callback_data;
3248         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3249         struct TCP_Server_Info *server = tcon->ses->server;
3250         struct smb2_sync_hdr *shdr =
3251                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3252         struct cifs_credits credits = { .value = 0, .instance = 0 };
3253         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3254                                  .rq_nvec = 2,
3255                                  .rq_pages = rdata->pages,
3256                                  .rq_offset = rdata->page_offset,
3257                                  .rq_npages = rdata->nr_pages,
3258                                  .rq_pagesz = rdata->pagesz,
3259                                  .rq_tailsz = rdata->tailsz };
3260
3261         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3262                  __func__, mid->mid, mid->mid_state, rdata->result,
3263                  rdata->bytes);
3264
3265         switch (mid->mid_state) {
3266         case MID_RESPONSE_RECEIVED:
3267                 credits.value = le16_to_cpu(shdr->CreditRequest);
3268                 credits.instance = server->reconnect_instance;
3269                 /* result already set, check signature */
3270                 if (server->sign && !mid->decrypted) {
3271                         int rc;
3272
3273                         rc = smb2_verify_signature(&rqst, server);
3274                         if (rc)
3275                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
3276                                          rc);
3277                 }
3278                 /* FIXME: should this be counted toward the initiating task? */
3279                 task_io_account_read(rdata->got_bytes);
3280                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3281                 break;
3282         case MID_REQUEST_SUBMITTED:
3283         case MID_RETRY_NEEDED:
3284                 rdata->result = -EAGAIN;
3285                 if (server->sign && rdata->got_bytes)
3286                         /* reset bytes number since we can not check a sign */
3287                         rdata->got_bytes = 0;
3288                 /* FIXME: should this be counted toward the initiating task? */
3289                 task_io_account_read(rdata->got_bytes);
3290                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3291                 break;
3292         case MID_RESPONSE_MALFORMED:
3293                 credits.value = le16_to_cpu(shdr->CreditRequest);
3294                 credits.instance = server->reconnect_instance;
3295                 /* fall through */
3296         default:
3297                 rdata->result = -EIO;
3298         }
3299 #ifdef CONFIG_CIFS_SMB_DIRECT
3300         /*
3301          * If this rdata has a memmory registered, the MR can be freed
3302          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3303          * because they have limited number and are used for future I/Os
3304          */
3305         if (rdata->mr) {
3306                 smbd_deregister_mr(rdata->mr);
3307                 rdata->mr = NULL;
3308         }
3309 #endif
3310         if (rdata->result && rdata->result != -ENODATA) {
3311                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3312                 trace_smb3_read_err(0 /* xid */,
3313                                     rdata->cfile->fid.persistent_fid,
3314                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3315                                     rdata->bytes, rdata->result);
3316         } else
3317                 trace_smb3_read_done(0 /* xid */,
3318                                      rdata->cfile->fid.persistent_fid,
3319                                      tcon->tid, tcon->ses->Suid,
3320                                      rdata->offset, rdata->got_bytes);
3321
3322         queue_work(cifsiod_wq, &rdata->work);
3323         DeleteMidQEntry(mid);
3324         add_credits(server, &credits, 0);
3325 }
3326
3327 /* smb2_async_readv - send an async read, and set up mid to handle result */
3328 int
3329 smb2_async_readv(struct cifs_readdata *rdata)
3330 {
3331         int rc, flags = 0;
3332         char *buf;
3333         struct smb2_sync_hdr *shdr;
3334         struct cifs_io_parms io_parms;
3335         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3336                                  .rq_nvec = 1 };
3337         struct TCP_Server_Info *server;
3338         unsigned int total_len;
3339
3340         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3341                  __func__, rdata->offset, rdata->bytes);
3342
3343         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3344         io_parms.offset = rdata->offset;
3345         io_parms.length = rdata->bytes;
3346         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3347         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3348         io_parms.pid = rdata->pid;
3349
3350         server = io_parms.tcon->ses->server;
3351
3352         rc = smb2_new_read_req(
3353                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3354         if (rc)
3355                 return rc;
3356
3357         if (smb3_encryption_required(io_parms.tcon))
3358                 flags |= CIFS_TRANSFORM_REQ;
3359
3360         rdata->iov[0].iov_base = buf;
3361         rdata->iov[0].iov_len = total_len;
3362
3363         shdr = (struct smb2_sync_hdr *)buf;
3364
3365         if (rdata->credits.value > 0) {
3366                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3367                                                 SMB2_MAX_BUFFER_SIZE));
3368                 shdr->CreditRequest =
3369                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3370
3371                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
3372                 if (rc)
3373                         goto async_readv_out;
3374
3375                 flags |= CIFS_HAS_CREDITS;
3376         }
3377
3378         kref_get(&rdata->refcount);
3379         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3380                              cifs_readv_receive, smb2_readv_callback,
3381                              smb3_handle_read_data, rdata, flags,
3382                              &rdata->credits);
3383         if (rc) {
3384                 kref_put(&rdata->refcount, cifs_readdata_release);
3385                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3386                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
3387                                     io_parms.tcon->tid,
3388                                     io_parms.tcon->ses->Suid,
3389                                     io_parms.offset, io_parms.length, rc);
3390         }
3391
3392 async_readv_out:
3393         cifs_small_buf_release(buf);
3394         return rc;
3395 }
3396
3397 int
3398 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3399           unsigned int *nbytes, char **buf, int *buf_type)
3400 {
3401         struct smb_rqst rqst;
3402         int resp_buftype, rc = -EACCES;
3403         struct smb2_read_plain_req *req = NULL;
3404         struct smb2_read_rsp *rsp = NULL;
3405         struct kvec iov[1];
3406         struct kvec rsp_iov;
3407         unsigned int total_len;
3408         int flags = CIFS_LOG_ERROR;
3409         struct cifs_ses *ses = io_parms->tcon->ses;
3410
3411         *nbytes = 0;
3412         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3413         if (rc)
3414                 return rc;
3415
3416         if (smb3_encryption_required(io_parms->tcon))
3417                 flags |= CIFS_TRANSFORM_REQ;
3418
3419         iov[0].iov_base = (char *)req;
3420         iov[0].iov_len = total_len;
3421
3422         memset(&rqst, 0, sizeof(struct smb_rqst));
3423         rqst.rq_iov = iov;
3424         rqst.rq_nvec = 1;
3425
3426         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3427         cifs_small_buf_release(req);
3428
3429         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3430
3431         if (rc) {
3432                 if (rc != -ENODATA) {
3433                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3434                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3435                         trace_smb3_read_err(xid, req->PersistentFileId,
3436                                             io_parms->tcon->tid, ses->Suid,
3437                                             io_parms->offset, io_parms->length,
3438                                             rc);
3439                 } else
3440                         trace_smb3_read_done(xid, req->PersistentFileId,
3441                                     io_parms->tcon->tid, ses->Suid,
3442                                     io_parms->offset, 0);
3443                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3444                 return rc == -ENODATA ? 0 : rc;
3445         } else
3446                 trace_smb3_read_done(xid, req->PersistentFileId,
3447                                     io_parms->tcon->tid, ses->Suid,
3448                                     io_parms->offset, io_parms->length);
3449
3450         *nbytes = le32_to_cpu(rsp->DataLength);
3451         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3452             (*nbytes > io_parms->length)) {
3453                 cifs_dbg(FYI, "bad length %d for count %d\n",
3454                          *nbytes, io_parms->length);
3455                 rc = -EIO;
3456                 *nbytes = 0;
3457         }
3458
3459         if (*buf) {
3460                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3461                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3462         } else if (resp_buftype != CIFS_NO_BUFFER) {
3463                 *buf = rsp_iov.iov_base;
3464                 if (resp_buftype == CIFS_SMALL_BUFFER)
3465                         *buf_type = CIFS_SMALL_BUFFER;
3466                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3467                         *buf_type = CIFS_LARGE_BUFFER;
3468         }
3469         return rc;
3470 }
3471
3472 /*
3473  * Check the mid_state and signature on received buffer (if any), and queue the
3474  * workqueue completion task.
3475  */
3476 static void
3477 smb2_writev_callback(struct mid_q_entry *mid)
3478 {
3479         struct cifs_writedata *wdata = mid->callback_data;
3480         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3481         struct TCP_Server_Info *server = tcon->ses->server;
3482         unsigned int written;
3483         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3484         struct cifs_credits credits = { .value = 0, .instance = 0 };
3485
3486         switch (mid->mid_state) {
3487         case MID_RESPONSE_RECEIVED:
3488                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3489                 credits.instance = server->reconnect_instance;
3490                 wdata->result = smb2_check_receive(mid, server, 0);
3491                 if (wdata->result != 0)
3492                         break;
3493
3494                 written = le32_to_cpu(rsp->DataLength);
3495                 /*
3496                  * Mask off high 16 bits when bytes written as returned
3497                  * by the server is greater than bytes requested by the
3498                  * client. OS/2 servers are known to set incorrect
3499                  * CountHigh values.
3500                  */
3501                 if (written > wdata->bytes)
3502                         written &= 0xFFFF;
3503
3504                 if (written < wdata->bytes)
3505                         wdata->result = -ENOSPC;
3506                 else
3507                         wdata->bytes = written;
3508                 break;
3509         case MID_REQUEST_SUBMITTED:
3510         case MID_RETRY_NEEDED:
3511                 wdata->result = -EAGAIN;
3512                 break;
3513         case MID_RESPONSE_MALFORMED:
3514                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3515                 credits.instance = server->reconnect_instance;
3516                 /* fall through */
3517         default:
3518                 wdata->result = -EIO;
3519                 break;
3520         }
3521 #ifdef CONFIG_CIFS_SMB_DIRECT
3522         /*
3523          * If this wdata has a memory registered, the MR can be freed
3524          * The number of MRs available is limited, it's important to recover
3525          * used MR as soon as I/O is finished. Hold MR longer in the later
3526          * I/O process can possibly result in I/O deadlock due to lack of MR
3527          * to send request on I/O retry
3528          */
3529         if (wdata->mr) {
3530                 smbd_deregister_mr(wdata->mr);
3531                 wdata->mr = NULL;
3532         }
3533 #endif
3534         if (wdata->result) {
3535                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3536                 trace_smb3_write_err(0 /* no xid */,
3537                                      wdata->cfile->fid.persistent_fid,
3538                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3539                                      wdata->bytes, wdata->result);
3540         } else
3541                 trace_smb3_write_done(0 /* no xid */,
3542                                       wdata->cfile->fid.persistent_fid,
3543                                       tcon->tid, tcon->ses->Suid,
3544                                       wdata->offset, wdata->bytes);
3545
3546         queue_work(cifsiod_wq, &wdata->work);
3547         DeleteMidQEntry(mid);
3548         add_credits(server, &credits, 0);
3549 }
3550
3551 /* smb2_async_writev - send an async write, and set up mid to handle result */
3552 int
3553 smb2_async_writev(struct cifs_writedata *wdata,
3554                   void (*release)(struct kref *kref))
3555 {
3556         int rc = -EACCES, flags = 0;
3557         struct smb2_write_req *req = NULL;
3558         struct smb2_sync_hdr *shdr;
3559         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3560         struct TCP_Server_Info *server = tcon->ses->server;
3561         struct kvec iov[1];
3562         struct smb_rqst rqst = { };
3563         unsigned int total_len;
3564
3565         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3566         if (rc)
3567                 return rc;
3568
3569         if (smb3_encryption_required(tcon))
3570                 flags |= CIFS_TRANSFORM_REQ;
3571
3572         shdr = (struct smb2_sync_hdr *)req;
3573         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3574
3575         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3576         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3577         req->WriteChannelInfoOffset = 0;
3578         req->WriteChannelInfoLength = 0;
3579         req->Channel = 0;
3580         req->Offset = cpu_to_le64(wdata->offset);
3581         req->DataOffset = cpu_to_le16(
3582                                 offsetof(struct smb2_write_req, Buffer));
3583         req->RemainingBytes = 0;
3584
3585         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
3586                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
3587 #ifdef CONFIG_CIFS_SMB_DIRECT
3588         /*
3589          * If we want to do a server RDMA read, fill in and append
3590          * smbd_buffer_descriptor_v1 to the end of write request
3591          */
3592         if (server->rdma && !server->sign && wdata->bytes >=
3593                 server->smbd_conn->rdma_readwrite_threshold) {
3594
3595                 struct smbd_buffer_descriptor_v1 *v1;
3596                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3597
3598                 wdata->mr = smbd_register_mr(
3599                                 server->smbd_conn, wdata->pages,
3600                                 wdata->nr_pages, wdata->page_offset,
3601                                 wdata->tailsz, false, need_invalidate);
3602                 if (!wdata->mr) {
3603                         rc = -ENOBUFS;
3604                         goto async_writev_out;
3605                 }
3606                 req->Length = 0;
3607                 req->DataOffset = 0;
3608                 if (wdata->nr_pages > 1)
3609                         req->RemainingBytes =
3610                                 cpu_to_le32(
3611                                         (wdata->nr_pages - 1) * wdata->pagesz -
3612                                         wdata->page_offset + wdata->tailsz
3613                                 );
3614                 else
3615                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3616                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3617                 if (need_invalidate)
3618                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3619                 req->WriteChannelInfoOffset =
3620                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3621                 req->WriteChannelInfoLength =
3622                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3623                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3624                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3625                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3626                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3627         }
3628 #endif
3629         iov[0].iov_len = total_len - 1;
3630         iov[0].iov_base = (char *)req;
3631
3632         rqst.rq_iov = iov;
3633         rqst.rq_nvec = 1;
3634         rqst.rq_pages = wdata->pages;
3635         rqst.rq_offset = wdata->page_offset;
3636         rqst.rq_npages = wdata->nr_pages;
3637         rqst.rq_pagesz = wdata->pagesz;
3638         rqst.rq_tailsz = wdata->tailsz;
3639 #ifdef CONFIG_CIFS_SMB_DIRECT
3640         if (wdata->mr) {
3641                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3642                 rqst.rq_npages = 0;
3643         }
3644 #endif
3645         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3646                  wdata->offset, wdata->bytes);
3647
3648 #ifdef CONFIG_CIFS_SMB_DIRECT
3649         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3650         if (!wdata->mr)
3651                 req->Length = cpu_to_le32(wdata->bytes);
3652 #else
3653         req->Length = cpu_to_le32(wdata->bytes);
3654 #endif
3655
3656         if (wdata->credits.value > 0) {
3657                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3658                                                     SMB2_MAX_BUFFER_SIZE));
3659                 shdr->CreditRequest =
3660                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3661
3662                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
3663                 if (rc)
3664                         goto async_writev_out;
3665
3666                 flags |= CIFS_HAS_CREDITS;
3667         }
3668
3669         kref_get(&wdata->refcount);
3670         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3671                              wdata, flags, &wdata->credits);
3672
3673         if (rc) {
3674                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
3675                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3676                                      wdata->bytes, rc);
3677                 kref_put(&wdata->refcount, release);
3678                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3679         }
3680
3681 async_writev_out:
3682         cifs_small_buf_release(req);
3683         return rc;
3684 }
3685
3686 /*
3687  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
3688  * The length field from io_parms must be at least 1 and indicates a number of
3689  * elements with data to write that begins with position 1 in iov array. All
3690  * data length is specified by count.
3691  */
3692 int
3693 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
3694            unsigned int *nbytes, struct kvec *iov, int n_vec)
3695 {
3696         struct smb_rqst rqst;
3697         int rc = 0;
3698         struct smb2_write_req *req = NULL;
3699         struct smb2_write_rsp *rsp = NULL;
3700         int resp_buftype;
3701         struct kvec rsp_iov;
3702         int flags = 0;
3703         unsigned int total_len;
3704
3705         *nbytes = 0;
3706
3707         if (n_vec < 1)
3708                 return rc;
3709
3710         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
3711                              &total_len);
3712         if (rc)
3713                 return rc;
3714
3715         if (io_parms->tcon->ses->server == NULL)
3716                 return -ECONNABORTED;
3717
3718         if (smb3_encryption_required(io_parms->tcon))
3719                 flags |= CIFS_TRANSFORM_REQ;
3720
3721         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3722
3723         req->PersistentFileId = io_parms->persistent_fid;
3724         req->VolatileFileId = io_parms->volatile_fid;
3725         req->WriteChannelInfoOffset = 0;
3726         req->WriteChannelInfoLength = 0;
3727         req->Channel = 0;
3728         req->Length = cpu_to_le32(io_parms->length);
3729         req->Offset = cpu_to_le64(io_parms->offset);
3730         req->DataOffset = cpu_to_le16(
3731                                 offsetof(struct smb2_write_req, Buffer));
3732         req->RemainingBytes = 0;
3733
3734         trace_smb3_write_enter(xid, io_parms->persistent_fid,
3735                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3736                 io_parms->offset, io_parms->length);
3737
3738         iov[0].iov_base = (char *)req;
3739         /* 1 for Buffer */
3740         iov[0].iov_len = total_len - 1;
3741
3742         memset(&rqst, 0, sizeof(struct smb_rqst));
3743         rqst.rq_iov = iov;
3744         rqst.rq_nvec = n_vec + 1;
3745
3746         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
3747                             &resp_buftype, flags, &rsp_iov);
3748         cifs_small_buf_release(req);
3749         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3750
3751         if (rc) {
3752                 trace_smb3_write_err(xid, req->PersistentFileId,
3753                                      io_parms->tcon->tid,
3754                                      io_parms->tcon->ses->Suid,
3755                                      io_parms->offset, io_parms->length, rc);
3756                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3757                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
3758         } else {
3759                 *nbytes = le32_to_cpu(rsp->DataLength);
3760                 trace_smb3_write_done(xid, req->PersistentFileId,
3761                                      io_parms->tcon->tid,
3762                                      io_parms->tcon->ses->Suid,
3763                                      io_parms->offset, *nbytes);
3764         }
3765
3766         free_rsp_buf(resp_buftype, rsp);
3767         return rc;
3768 }
3769
3770 static unsigned int
3771 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
3772 {
3773         int len;
3774         unsigned int entrycount = 0;
3775         unsigned int next_offset = 0;
3776         char *entryptr;
3777         FILE_DIRECTORY_INFO *dir_info;
3778
3779         if (bufstart == NULL)
3780                 return 0;
3781
3782         entryptr = bufstart;
3783
3784         while (1) {
3785                 if (entryptr + next_offset < entryptr ||
3786                     entryptr + next_offset > end_of_buf ||
3787                     entryptr + next_offset + size > end_of_buf) {
3788                         cifs_dbg(VFS, "malformed search entry would overflow\n");
3789                         break;
3790                 }
3791
3792                 entryptr = entryptr + next_offset;
3793                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
3794
3795                 len = le32_to_cpu(dir_info->FileNameLength);
3796                 if (entryptr + len < entryptr ||
3797                     entryptr + len > end_of_buf ||
3798                     entryptr + len + size > end_of_buf) {
3799                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
3800                                  end_of_buf);
3801                         break;
3802                 }
3803
3804                 *lastentry = entryptr;
3805                 entrycount++;
3806
3807                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
3808                 if (!next_offset)
3809                         break;
3810         }
3811
3812         return entrycount;
3813 }
3814
3815 /*
3816  * Readdir/FindFirst
3817  */
3818 int
3819 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
3820                      u64 persistent_fid, u64 volatile_fid, int index,
3821                      struct cifs_search_info *srch_inf)
3822 {
3823         struct smb_rqst rqst;
3824         struct smb2_query_directory_req *req;
3825         struct smb2_query_directory_rsp *rsp = NULL;
3826         struct kvec iov[2];
3827         struct kvec rsp_iov;
3828         int rc = 0;
3829         int len;
3830         int resp_buftype = CIFS_NO_BUFFER;
3831         unsigned char *bufptr;
3832         struct TCP_Server_Info *server;
3833         struct cifs_ses *ses = tcon->ses;
3834         __le16 asteriks = cpu_to_le16('*');
3835         char *end_of_smb;
3836         unsigned int output_size = CIFSMaxBufSize;
3837         size_t info_buf_size;
3838         int flags = 0;
3839         unsigned int total_len;
3840
3841         if (ses && (ses->server))
3842                 server = ses->server;
3843         else
3844                 return -EIO;
3845
3846         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
3847                              &total_len);
3848         if (rc)
3849                 return rc;
3850
3851         if (smb3_encryption_required(tcon))
3852                 flags |= CIFS_TRANSFORM_REQ;
3853
3854         switch (srch_inf->info_level) {
3855         case SMB_FIND_FILE_DIRECTORY_INFO:
3856                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3857                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3858                 break;
3859         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3860                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3861                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3862                 break;
3863         default:
3864                 cifs_dbg(VFS, "info level %u isn't supported\n",
3865                          srch_inf->info_level);
3866                 rc = -EINVAL;
3867                 goto qdir_exit;
3868         }
3869
3870         req->FileIndex = cpu_to_le32(index);
3871         req->PersistentFileId = persistent_fid;
3872         req->VolatileFileId = volatile_fid;
3873
3874         len = 0x2;
3875         bufptr = req->Buffer;
3876         memcpy(bufptr, &asteriks, len);
3877
3878         req->FileNameOffset =
3879                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3880         req->FileNameLength = cpu_to_le16(len);
3881         /*
3882          * BB could be 30 bytes or so longer if we used SMB2 specific
3883          * buffer lengths, but this is safe and close enough.
3884          */
3885         output_size = min_t(unsigned int, output_size, server->maxBuf);
3886         output_size = min_t(unsigned int, output_size, 2 << 15);
3887         req->OutputBufferLength = cpu_to_le32(output_size);
3888
3889         iov[0].iov_base = (char *)req;
3890         /* 1 for Buffer */
3891         iov[0].iov_len = total_len - 1;
3892
3893         iov[1].iov_base = (char *)(req->Buffer);
3894         iov[1].iov_len = len;
3895
3896         memset(&rqst, 0, sizeof(struct smb_rqst));
3897         rqst.rq_iov = iov;
3898         rqst.rq_nvec = 2;
3899
3900         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
3901                         tcon->ses->Suid, index, output_size);
3902
3903         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3904         cifs_small_buf_release(req);
3905         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3906
3907         if (rc) {
3908                 if (rc == -ENODATA &&
3909                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
3910                         trace_smb3_query_dir_done(xid, persistent_fid,
3911                                 tcon->tid, tcon->ses->Suid, index, 0);
3912                         srch_inf->endOfSearch = true;
3913                         rc = 0;
3914                 } else {
3915                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
3916                                 tcon->ses->Suid, index, 0, rc);
3917                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
3918                 }
3919                 goto qdir_exit;
3920         }
3921
3922         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
3923                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
3924                                info_buf_size);
3925         if (rc) {
3926                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
3927                         tcon->ses->Suid, index, 0, rc);
3928                 goto qdir_exit;
3929         }
3930
3931         srch_inf->unicode = true;
3932
3933         if (srch_inf->ntwrk_buf_start) {
3934                 if (srch_inf->smallBuf)
3935                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
3936                 else
3937                         cifs_buf_release(srch_inf->ntwrk_buf_start);
3938         }
3939         srch_inf->ntwrk_buf_start = (char *)rsp;
3940         srch_inf->srch_entries_start = srch_inf->last_entry =
3941                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
3942         end_of_smb = rsp_iov.iov_len + (char *)rsp;
3943         srch_inf->entries_in_buffer =
3944                         num_entries(srch_inf->srch_entries_start, end_of_smb,
3945                                     &srch_inf->last_entry, info_buf_size);
3946         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
3947         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
3948                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
3949                  srch_inf->srch_entries_start, srch_inf->last_entry);
3950         if (resp_buftype == CIFS_LARGE_BUFFER)
3951                 srch_inf->smallBuf = false;
3952         else if (resp_buftype == CIFS_SMALL_BUFFER)
3953                 srch_inf->smallBuf = true;
3954         else
3955                 cifs_dbg(VFS, "illegal search buffer type\n");
3956
3957         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
3958                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
3959         return rc;
3960
3961 qdir_exit:
3962         free_rsp_buf(resp_buftype, rsp);
3963         return rc;
3964 }
3965
3966 int
3967 SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
3968                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3969                u8 info_type, u32 additional_info,
3970                 void **data, unsigned int *size)
3971 {
3972         struct smb2_set_info_req *req;
3973         struct kvec *iov = rqst->rq_iov;
3974         unsigned int i, total_len;
3975         int rc;
3976
3977         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
3978         if (rc)
3979                 return rc;
3980
3981         req->sync_hdr.ProcessId = cpu_to_le32(pid);
3982         req->InfoType = info_type;
3983         req->FileInfoClass = info_class;
3984         req->PersistentFileId = persistent_fid;
3985         req->VolatileFileId = volatile_fid;
3986         req->AdditionalInformation = cpu_to_le32(additional_info);
3987
3988         req->BufferOffset =
3989                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
3990         req->BufferLength = cpu_to_le32(*size);
3991
3992         memcpy(req->Buffer, *data, *size);
3993         total_len += *size;
3994
3995         iov[0].iov_base = (char *)req;
3996         /* 1 for Buffer */
3997         iov[0].iov_len = total_len - 1;
3998
3999         for (i = 1; i < rqst->rq_nvec; i++) {
4000                 le32_add_cpu(&req->BufferLength, size[i]);
4001                 iov[i].iov_base = (char *)data[i];
4002                 iov[i].iov_len = size[i];
4003         }
4004
4005         return 0;
4006 }
4007
4008 void
4009 SMB2_set_info_free(struct smb_rqst *rqst)
4010 {
4011         if (rqst && rqst->rq_iov)
4012                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4013 }
4014
4015 static int
4016 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4017                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4018                u8 info_type, u32 additional_info, unsigned int num,
4019                 void **data, unsigned int *size)
4020 {
4021         struct smb_rqst rqst;
4022         struct smb2_set_info_rsp *rsp = NULL;
4023         struct kvec *iov;
4024         struct kvec rsp_iov;
4025         int rc = 0;
4026         int resp_buftype;
4027         struct cifs_ses *ses = tcon->ses;
4028         int flags = 0;
4029
4030         if (!ses || !(ses->server))
4031                 return -EIO;
4032
4033         if (!num)
4034                 return -EINVAL;
4035
4036         if (smb3_encryption_required(tcon))
4037                 flags |= CIFS_TRANSFORM_REQ;
4038
4039         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4040         if (!iov)
4041                 return -ENOMEM;
4042
4043         memset(&rqst, 0, sizeof(struct smb_rqst));
4044         rqst.rq_iov = iov;
4045         rqst.rq_nvec = num;
4046
4047         rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid,
4048                                 info_class, info_type, additional_info,
4049                                 data, size);
4050         if (rc) {
4051                 kfree(iov);
4052                 return rc;
4053         }
4054
4055
4056         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
4057                             &rsp_iov);
4058         SMB2_set_info_free(&rqst);
4059         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4060
4061         if (rc != 0) {
4062                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4063                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4064                                 ses->Suid, info_class, (__u32)info_type, rc);
4065         }
4066
4067         free_rsp_buf(resp_buftype, rsp);
4068         kfree(iov);
4069         return rc;
4070 }
4071
4072 int
4073 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4074              u64 volatile_fid, u32 pid, __le64 *eof)
4075 {
4076         struct smb2_file_eof_info info;
4077         void *data;
4078         unsigned int size;
4079
4080         info.EndOfFile = *eof;
4081
4082         data = &info;
4083         size = sizeof(struct smb2_file_eof_info);
4084
4085         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4086                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4087                         0, 1, &data, &size);
4088 }
4089
4090 int
4091 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4092                 u64 persistent_fid, u64 volatile_fid,
4093                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4094 {
4095         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4096                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4097                         1, (void **)&pnntsd, &pacllen);
4098 }
4099
4100 int
4101 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4102             u64 persistent_fid, u64 volatile_fid,
4103             struct smb2_file_full_ea_info *buf, int len)
4104 {
4105         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4106                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4107                 0, 1, (void **)&buf, &len);
4108 }
4109
4110 int
4111 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4112                   const u64 persistent_fid, const u64 volatile_fid,
4113                   __u8 oplock_level)
4114 {
4115         struct smb_rqst rqst;
4116         int rc;
4117         struct smb2_oplock_break *req = NULL;
4118         struct cifs_ses *ses = tcon->ses;
4119         int flags = CIFS_OBREAK_OP;
4120         unsigned int total_len;
4121         struct kvec iov[1];
4122         struct kvec rsp_iov;
4123         int resp_buf_type;
4124
4125         cifs_dbg(FYI, "SMB2_oplock_break\n");
4126         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4127                              &total_len);
4128         if (rc)
4129                 return rc;
4130
4131         if (smb3_encryption_required(tcon))
4132                 flags |= CIFS_TRANSFORM_REQ;
4133
4134         req->VolatileFid = volatile_fid;
4135         req->PersistentFid = persistent_fid;
4136         req->OplockLevel = oplock_level;
4137         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4138
4139         flags |= CIFS_NO_RESP;
4140
4141         iov[0].iov_base = (char *)req;
4142         iov[0].iov_len = total_len;
4143
4144         memset(&rqst, 0, sizeof(struct smb_rqst));
4145         rqst.rq_iov = iov;
4146         rqst.rq_nvec = 1;
4147
4148         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4149         cifs_small_buf_release(req);
4150
4151         if (rc) {
4152                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4153                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
4154         }
4155
4156         return rc;
4157 }
4158
4159 void
4160 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
4161                              struct kstatfs *kst)
4162 {
4163         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
4164                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
4165         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
4166         kst->f_bfree  = kst->f_bavail =
4167                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
4168         return;
4169 }
4170
4171 static void
4172 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
4173                         struct kstatfs *kst)
4174 {
4175         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
4176         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
4177         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
4178         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
4179                 kst->f_bavail = kst->f_bfree;
4180         else
4181                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
4182         if (response_data->TotalFileNodes != cpu_to_le64(-1))
4183                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
4184         if (response_data->FreeFileNodes != cpu_to_le64(-1))
4185                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
4186
4187         return;
4188 }
4189
4190 static int
4191 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
4192                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
4193 {
4194         int rc;
4195         struct smb2_query_info_req *req;
4196         unsigned int total_len;
4197
4198         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
4199
4200         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
4201                 return -EIO;
4202
4203         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
4204                              &total_len);
4205         if (rc)
4206                 return rc;
4207
4208         req->InfoType = SMB2_O_INFO_FILESYSTEM;
4209         req->FileInfoClass = level;
4210         req->PersistentFileId = persistent_fid;
4211         req->VolatileFileId = volatile_fid;
4212         /* 1 for pad */
4213         req->InputBufferOffset =
4214                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4215         req->OutputBufferLength = cpu_to_le32(
4216                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4217
4218         iov->iov_base = (char *)req;
4219         iov->iov_len = total_len;
4220         return 0;
4221 }
4222
4223 int
4224 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4225               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4226 {
4227         struct smb_rqst rqst;
4228         struct smb2_query_info_rsp *rsp = NULL;
4229         struct kvec iov;
4230         struct kvec rsp_iov;
4231         int rc = 0;
4232         int resp_buftype;
4233         struct cifs_ses *ses = tcon->ses;
4234         FILE_SYSTEM_POSIX_INFO *info = NULL;
4235         int flags = 0;
4236
4237         rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4238                                 sizeof(FILE_SYSTEM_POSIX_INFO),
4239                                 persistent_fid, volatile_fid);
4240         if (rc)
4241                 return rc;
4242
4243         if (smb3_encryption_required(tcon))
4244                 flags |= CIFS_TRANSFORM_REQ;
4245
4246         memset(&rqst, 0, sizeof(struct smb_rqst));
4247         rqst.rq_iov = &iov;
4248         rqst.rq_nvec = 1;
4249
4250         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4251         cifs_small_buf_release(iov.iov_base);
4252         if (rc) {
4253                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4254                 goto posix_qfsinf_exit;
4255         }
4256         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4257
4258         info = (FILE_SYSTEM_POSIX_INFO *)(
4259                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4260         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4261                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4262                                sizeof(FILE_SYSTEM_POSIX_INFO));
4263         if (!rc)
4264                 copy_posix_fs_info_to_kstatfs(info, fsdata);
4265
4266 posix_qfsinf_exit:
4267         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4268         return rc;
4269 }
4270
4271 int
4272 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
4273               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4274 {
4275         struct smb_rqst rqst;
4276         struct smb2_query_info_rsp *rsp = NULL;
4277         struct kvec iov;
4278         struct kvec rsp_iov;
4279         int rc = 0;
4280         int resp_buftype;
4281         struct cifs_ses *ses = tcon->ses;
4282         struct smb2_fs_full_size_info *info = NULL;
4283         int flags = 0;
4284
4285         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
4286                                 sizeof(struct smb2_fs_full_size_info),
4287                                 persistent_fid, volatile_fid);
4288         if (rc)
4289                 return rc;
4290
4291         if (smb3_encryption_required(tcon))
4292                 flags |= CIFS_TRANSFORM_REQ;
4293
4294         memset(&rqst, 0, sizeof(struct smb_rqst));
4295         rqst.rq_iov = &iov;
4296         rqst.rq_nvec = 1;
4297
4298         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4299         cifs_small_buf_release(iov.iov_base);
4300         if (rc) {
4301                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4302                 goto qfsinf_exit;
4303         }
4304         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4305
4306         info = (struct smb2_fs_full_size_info *)(
4307                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4308         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4309                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4310                                sizeof(struct smb2_fs_full_size_info));
4311         if (!rc)
4312                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
4313
4314 qfsinf_exit:
4315         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4316         return rc;
4317 }
4318
4319 int
4320 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4321               u64 persistent_fid, u64 volatile_fid, int level)
4322 {
4323         struct smb_rqst rqst;
4324         struct smb2_query_info_rsp *rsp = NULL;
4325         struct kvec iov;
4326         struct kvec rsp_iov;
4327         int rc = 0;
4328         int resp_buftype, max_len, min_len;
4329         struct cifs_ses *ses = tcon->ses;
4330         unsigned int rsp_len, offset;
4331         int flags = 0;
4332
4333         if (level == FS_DEVICE_INFORMATION) {
4334                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4335                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4336         } else if (level == FS_ATTRIBUTE_INFORMATION) {
4337                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4338                 min_len = MIN_FS_ATTR_INFO_SIZE;
4339         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4340                 max_len = sizeof(struct smb3_fs_ss_info);
4341                 min_len = sizeof(struct smb3_fs_ss_info);
4342         } else if (level == FS_VOLUME_INFORMATION) {
4343                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
4344                 min_len = sizeof(struct smb3_fs_vol_info);
4345         } else {
4346                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4347                 return -EINVAL;
4348         }
4349
4350         rc = build_qfs_info_req(&iov, tcon, level, max_len,
4351                                 persistent_fid, volatile_fid);
4352         if (rc)
4353                 return rc;
4354
4355         if (smb3_encryption_required(tcon))
4356                 flags |= CIFS_TRANSFORM_REQ;
4357
4358         memset(&rqst, 0, sizeof(struct smb_rqst));
4359         rqst.rq_iov = &iov;
4360         rqst.rq_nvec = 1;
4361
4362         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4363         cifs_small_buf_release(iov.iov_base);
4364         if (rc) {
4365                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4366                 goto qfsattr_exit;
4367         }
4368         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4369
4370         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4371         offset = le16_to_cpu(rsp->OutputBufferOffset);
4372         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
4373         if (rc)
4374                 goto qfsattr_exit;
4375
4376         if (level == FS_ATTRIBUTE_INFORMATION)
4377                 memcpy(&tcon->fsAttrInfo, offset
4378                         + (char *)rsp, min_t(unsigned int,
4379                         rsp_len, max_len));
4380         else if (level == FS_DEVICE_INFORMATION)
4381                 memcpy(&tcon->fsDevInfo, offset
4382                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4383         else if (level == FS_SECTOR_SIZE_INFORMATION) {
4384                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4385                         (offset + (char *)rsp);
4386                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4387                 tcon->perf_sector_size =
4388                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4389         } else if (level == FS_VOLUME_INFORMATION) {
4390                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
4391                         (offset + (char *)rsp);
4392                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
4393                 tcon->vol_create_time = vol_info->VolumeCreationTime;
4394         }
4395
4396 qfsattr_exit:
4397         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4398         return rc;
4399 }
4400
4401 int
4402 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4403            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4404            const __u32 num_lock, struct smb2_lock_element *buf)
4405 {
4406         struct smb_rqst rqst;
4407         int rc = 0;
4408         struct smb2_lock_req *req = NULL;
4409         struct kvec iov[2];
4410         struct kvec rsp_iov;
4411         int resp_buf_type;
4412         unsigned int count;
4413         int flags = CIFS_NO_RESP;
4414         unsigned int total_len;
4415
4416         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4417
4418         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4419         if (rc)
4420                 return rc;
4421
4422         if (smb3_encryption_required(tcon))
4423                 flags |= CIFS_TRANSFORM_REQ;
4424
4425         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4426         req->LockCount = cpu_to_le16(num_lock);
4427
4428         req->PersistentFileId = persist_fid;
4429         req->VolatileFileId = volatile_fid;
4430
4431         count = num_lock * sizeof(struct smb2_lock_element);
4432
4433         iov[0].iov_base = (char *)req;
4434         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4435         iov[1].iov_base = (char *)buf;
4436         iov[1].iov_len = count;
4437
4438         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4439
4440         memset(&rqst, 0, sizeof(struct smb_rqst));
4441         rqst.rq_iov = iov;
4442         rqst.rq_nvec = 2;
4443
4444         rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4445                             &rsp_iov);
4446         cifs_small_buf_release(req);
4447         if (rc) {
4448                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4449                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4450                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4451                                     tcon->ses->Suid, rc);
4452         }
4453
4454         return rc;
4455 }
4456
4457 int
4458 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
4459           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4460           const __u64 length, const __u64 offset, const __u32 lock_flags,
4461           const bool wait)
4462 {
4463         struct smb2_lock_element lock;
4464
4465         lock.Offset = cpu_to_le64(offset);
4466         lock.Length = cpu_to_le64(length);
4467         lock.Flags = cpu_to_le32(lock_flags);
4468         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
4469                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
4470
4471         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
4472 }
4473
4474 int
4475 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
4476                  __u8 *lease_key, const __le32 lease_state)
4477 {
4478         struct smb_rqst rqst;
4479         int rc;
4480         struct smb2_lease_ack *req = NULL;
4481         struct cifs_ses *ses = tcon->ses;
4482         int flags = CIFS_OBREAK_OP;
4483         unsigned int total_len;
4484         struct kvec iov[1];
4485         struct kvec rsp_iov;
4486         int resp_buf_type;
4487         __u64 *please_key_high;
4488         __u64 *please_key_low;
4489
4490         cifs_dbg(FYI, "SMB2_lease_break\n");
4491         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4492                              &total_len);
4493         if (rc)
4494                 return rc;
4495
4496         if (smb3_encryption_required(tcon))
4497                 flags |= CIFS_TRANSFORM_REQ;
4498
4499         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4500         req->StructureSize = cpu_to_le16(36);
4501         total_len += 12;
4502
4503         memcpy(req->LeaseKey, lease_key, 16);
4504         req->LeaseState = lease_state;
4505
4506         flags |= CIFS_NO_RESP;
4507
4508         iov[0].iov_base = (char *)req;
4509         iov[0].iov_len = total_len;
4510
4511         memset(&rqst, 0, sizeof(struct smb_rqst));
4512         rqst.rq_iov = iov;
4513         rqst.rq_nvec = 1;
4514
4515         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4516         cifs_small_buf_release(req);
4517
4518         please_key_low = (__u64 *)lease_key;
4519         please_key_high = (__u64 *)(lease_key+8);
4520         if (rc) {
4521                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4522                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
4523                         ses->Suid, *please_key_low, *please_key_high, rc);
4524                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
4525         } else
4526                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
4527                         ses->Suid, *please_key_low, *please_key_high);
4528
4529         return rc;
4530 }