fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/uuid.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/xattr.h>
  39 #include "smb2pdu.h"
  40 #include "cifsglob.h"
  41 #include "cifsacl.h"
  42 #include "cifsproto.h"
  43 #include "smb2proto.h"
  44 #include "cifs_unicode.h"
  45 #include "cifs_debug.h"
  46 #include "ntlmssp.h"
  47 #include "smb2status.h"
  48 #include "smb2glob.h"
  49 #include "cifspdu.h"
  50 #include "cifs_spnego.h"
  51 #include "smbdirect.h"
  52 #include "trace.h"
  53 #ifdef CONFIG_CIFS_DFS_UPCALL
  54 #include "dfs_cache.h"
  55 #endif
  56
  57 /*
  58  *  The following table defines the expected "StructureSize" of SMB2 requests
  59  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  60  *
  61  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  62  *  indexed by command in host byte order.
  63  */
  64 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  65         /* SMB2_NEGOTIATE */ 36,
  66         /* SMB2_SESSION_SETUP */ 25,
  67         /* SMB2_LOGOFF */ 4,
  68         /* SMB2_TREE_CONNECT */ 9,
  69         /* SMB2_TREE_DISCONNECT */ 4,
  70         /* SMB2_CREATE */ 57,
  71         /* SMB2_CLOSE */ 24,
  72         /* SMB2_FLUSH */ 24,
  73         /* SMB2_READ */ 49,
  74         /* SMB2_WRITE */ 49,
  75         /* SMB2_LOCK */ 48,
  76         /* SMB2_IOCTL */ 57,
  77         /* SMB2_CANCEL */ 4,
  78         /* SMB2_ECHO */ 4,
  79         /* SMB2_QUERY_DIRECTORY */ 33,
  80         /* SMB2_CHANGE_NOTIFY */ 32,
  81         /* SMB2_QUERY_INFO */ 41,
  82         /* SMB2_SET_INFO */ 33,
  83         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  84 };
  85
  86 int smb3_encryption_required(const struct cifs_tcon *tcon)
  87 {
  88         if (!tcon)
  89                 return 0;
  90         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  91             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  92                 return 1;
  93         if (tcon->seal &&
  94             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  95                 return 1;
  96         return 0;
  97 }
  98
  99 static void
 100 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
 101                   const struct cifs_tcon *tcon)
 102 {
 103         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 104         shdr->StructureSize = cpu_to_le16(64);
 105         shdr->Command = smb2_cmd;
 106         if (tcon && tcon->ses && tcon->ses->server) {
 107                 struct TCP_Server_Info *server = tcon->ses->server;
 108
 109                 spin_lock(&server->req_lock);
 110                 /* Request up to 10 credits but don't go over the limit. */
 111                 if (server->credits >= server->max_credits)
 112                         shdr->CreditRequest = cpu_to_le16(0);
 113                 else
 114                         shdr->CreditRequest = cpu_to_le16(
 115                                 min_t(int, server->max_credits -
 116                                                 server->credits, 10));
 117                 spin_unlock(&server->req_lock);
 118         } else {
 119                 shdr->CreditRequest = cpu_to_le16(2);
 120         }
 121         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 122
 123         if (!tcon)
 124                 goto out;
 125
 126         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 127         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 128         if ((tcon->ses) && (tcon->ses->server) &&
 129             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 130                 shdr->CreditCharge = cpu_to_le16(1);
 131         /* else CreditCharge MBZ */
 132
 133         shdr->TreeId = tcon->tid;
 134         /* Uid is not converted */
 135         if (tcon->ses)
 136                 shdr->SessionId = tcon->ses->Suid;
 137
 138         /*
 139          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 140          * to pass the path on the Open SMB prefixed by \\server\share.
 141          * Not sure when we would need to do the augmented path (if ever) and
 142          * setting this flag breaks the SMB2 open operation since it is
 143          * illegal to send an empty path name (without \\server\share prefix)
 144          * when the DFS flag is set in the SMB open header. We could
 145          * consider setting the flag on all operations other than open
 146          * but it is safer to net set it for now.
 147          */
 148 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 149                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 150
 151         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
 152             !smb3_encryption_required(tcon))
 153                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 154 out:
 155         return;
 156 }
 157
 158 #ifdef CONFIG_CIFS_DFS_UPCALL
 159 static int __smb2_reconnect(const struct nls_table *nlsc,
 160                             struct cifs_tcon *tcon)
 161 {
 162         int rc;
 163         struct dfs_cache_tgt_list tl;
 164         struct dfs_cache_tgt_iterator *it = NULL;
 165         char *tree;
 166         const char *tcp_host;
 167         size_t tcp_host_len;
 168         const char *dfs_host;
 169         size_t dfs_host_len;
 170
 171         tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL);
 172         if (!tree)
 173                 return -ENOMEM;
 174
 175         if (tcon->ipc) {
 176                 scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$",
 177                           tcon->ses->server->hostname);
 178                 rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
 179                 goto out;
 180         }
 181
 182         if (!tcon->dfs_path) {
 183                 rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
 184                 goto out;
 185         }
 186
 187         rc = dfs_cache_noreq_find(tcon->dfs_path + 1, NULL, &tl);
 188         if (rc)
 189                 goto out;
 190
 191         extract_unc_hostname(tcon->ses->server->hostname, &tcp_host,
 192                              &tcp_host_len);
 193
 194         for (it = dfs_cache_get_tgt_iterator(&tl); it;
 195              it = dfs_cache_get_next_tgt(&tl, it)) {
 196                 const char *tgt = dfs_cache_get_tgt_name(it);
 197
 198                 extract_unc_hostname(tgt, &dfs_host, &dfs_host_len);
 199
 200                 if (dfs_host_len != tcp_host_len
 201                     || strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) {
 202                         cifs_dbg(FYI, "%s: skipping %.*s, doesn't match %.*s",
 203                                  __func__,
 204                                  (int)dfs_host_len, dfs_host,
 205                                  (int)tcp_host_len, tcp_host);
 206                         continue;
 207                 }
 208
 209                 scnprintf(tree, MAX_TREE_SIZE, "\\%s", tgt);
 210
 211                 rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
 212                 if (!rc)
 213                         break;
 214                 if (rc == -EREMOTE)
 215                         break;
 216         }
 217
 218         if (!rc) {
 219                 if (it)
 220                         rc = dfs_cache_noreq_update_tgthint(tcon->dfs_path + 1,
 221                                                             it);
 222                 else
 223                         rc = -ENOENT;
 224         }
 225         dfs_cache_free_tgts(&tl);
 226 out:
 227         kfree(tree);
 228         return rc;
 229 }
 230 #else
 231 static inline int __smb2_reconnect(const struct nls_table *nlsc,
 232                                    struct cifs_tcon *tcon)
 233 {
 234         return SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
 235 }
 236 #endif
 237
 238 static int
 239 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 240 {
 241         int rc;
 242         struct nls_table *nls_codepage;
 243         struct cifs_ses *ses;
 244         struct TCP_Server_Info *server;
 245         int retries;
 246
 247         /*
 248          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 249          * check for tcp and smb session status done differently
 250          * for those three - in the calling routine.
 251          */
 252         if (tcon == NULL)
 253                 return 0;
 254
 255         if (smb2_command == SMB2_TREE_CONNECT)
 256                 return 0;
 257
 258         if (tcon->tidStatus == CifsExiting) {
 259                 /*
 260                  * only tree disconnect, open, and write,
 261                  * (and ulogoff which does not have tcon)
 262                  * are allowed as we start force umount.
 263                  */
 264                 if ((smb2_command != SMB2_WRITE) &&
 265                    (smb2_command != SMB2_CREATE) &&
 266                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 267                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 268                                  smb2_command);
 269                         return -ENODEV;
 270                 }
 271         }
 272         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 273             (!tcon->ses->server))
 274                 return -EIO;
 275
 276         ses = tcon->ses;
 277         server = ses->server;
 278
 279         retries = server->nr_targets;
 280
 281         /*
 282          * Give demultiplex thread up to 10 seconds to each target available for
 283          * reconnect -- should be greater than cifs socket timeout which is 7
 284          * seconds.
 285          */
 286         while (server->tcpStatus == CifsNeedReconnect) {
 287                 /*
 288                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 289                  * here since they are implicitly done when session drops.
 290                  */
 291                 switch (smb2_command) {
 292                 /*
 293                  * BB Should we keep oplock break and add flush to exceptions?
 294                  */
 295                 case SMB2_TREE_DISCONNECT:
 296                 case SMB2_CANCEL:
 297                 case SMB2_CLOSE:
 298                 case SMB2_OPLOCK_BREAK:
 299                         return -EAGAIN;
 300                 }
 301
 302                 rc = wait_event_interruptible_timeout(server->response_q,
 303                                                       (server->tcpStatus != CifsNeedReconnect),
 304                                                       10 * HZ);
 305                 if (rc < 0) {
 306                         cifs_dbg(FYI, "%s: aborting reconnect due to a received"
 307                                  " signal by the process\n", __func__);
 308                         return -ERESTARTSYS;
 309                 }
 310
 311                 /* are we still trying to reconnect? */
 312                 if (server->tcpStatus != CifsNeedReconnect)
 313                         break;
 314
 315                 if (--retries)
 316                         continue;
 317
 318                 /*
 319                  * on "soft" mounts we wait once. Hard mounts keep
 320                  * retrying until process is killed or server comes
 321                  * back on-line
 322                  */
 323                 if (!tcon->retry) {
 324                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 325                         return -EHOSTDOWN;
 326                 }
 327                 retries = server->nr_targets;
 328         }
 329
 330         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 331                 return 0;
 332
 333         nls_codepage = load_nls_default();
 334
 335         /*
 336          * need to prevent multiple threads trying to simultaneously reconnect
 337          * the same SMB session
 338          */
 339         mutex_lock(&tcon->ses->session_mutex);
 340
 341         /*
 342          * Recheck after acquire mutex. If another thread is negotiating
 343          * and the server never sends an answer the socket will be closed
 344          * and tcpStatus set to reconnect.
 345          */
 346         if (server->tcpStatus == CifsNeedReconnect) {
 347                 rc = -EHOSTDOWN;
 348                 mutex_unlock(&tcon->ses->session_mutex);
 349                 goto out;
 350         }
 351
 352         rc = cifs_negotiate_protocol(0, tcon->ses);
 353         if (!rc && tcon->ses->need_reconnect)
 354                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 355
 356         if (rc || !tcon->need_reconnect) {
 357                 mutex_unlock(&tcon->ses->session_mutex);
 358                 goto out;
 359         }
 360
 361         cifs_mark_open_files_invalid(tcon);
 362         if (tcon->use_persistent)
 363                 tcon->need_reopen_files = true;
 364
 365         rc = __smb2_reconnect(nls_codepage, tcon);
 366         mutex_unlock(&tcon->ses->session_mutex);
 367
 368         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 369         if (rc) {
 370                 /* If sess reconnected but tcon didn't, something strange ... */
 371                 printk_once(KERN_WARNING "reconnect tcon failed rc = %d\n", rc);
 372                 goto out;
 373         }
 374
 375         if (smb2_command != SMB2_INTERNAL_CMD)
 376                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
 377
 378         atomic_inc(&tconInfoReconnectCount);
 379 out:
 380         /*
 381          * Check if handle based operation so we know whether we can continue
 382          * or not without returning to caller to reset file handle.
 383          */
 384         /*
 385          * BB Is flush done by server on drop of tcp session? Should we special
 386          * case it and skip above?
 387          */
 388         switch (smb2_command) {
 389         case SMB2_FLUSH:
 390         case SMB2_READ:
 391         case SMB2_WRITE:
 392         case SMB2_LOCK:
 393         case SMB2_IOCTL:
 394         case SMB2_QUERY_DIRECTORY:
 395         case SMB2_CHANGE_NOTIFY:
 396         case SMB2_QUERY_INFO:
 397         case SMB2_SET_INFO:
 398                 rc = -EAGAIN;
 399         }
 400         unload_nls(nls_codepage);
 401         return rc;
 402 }
 403
 404 static void
 405 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
 406                unsigned int *total_len)
 407 {
 408         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 409         /* lookup word count ie StructureSize from table */
 410         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 411
 412         /*
 413          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 414          * largest operations (Create)
 415          */
 416         memset(buf, 0, 256);
 417
 418         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
 419         spdu->StructureSize2 = cpu_to_le16(parmsize);
 420
 421         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 422 }
 423
 424 /*
 425  * Allocate and return pointer to an SMB request hdr, and set basic
 426  * SMB information in the SMB header. If the return code is zero, this
 427  * function must have filled in request_buf pointer.
 428  */
 429 static int
 430 smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 431                     void **request_buf, unsigned int *total_len)
 432 {
 433         int rc;
 434
 435         rc = smb2_reconnect(smb2_command, tcon);
 436         if (rc)
 437                 return rc;
 438
 439         /* BB eventually switch this to SMB2 specific small buf size */
 440         if (smb2_command == SMB2_SET_INFO)
 441                 *request_buf = cifs_buf_get();
 442         else
 443                 *request_buf = cifs_small_buf_get();
 444         if (*request_buf == NULL) {
 445                 /* BB should we add a retry in here if not a writepage? */
 446                 return -ENOMEM;
 447         }
 448
 449         fill_small_buf(smb2_command, tcon,
 450                        (struct smb2_sync_hdr *)(*request_buf),
 451                        total_len);
 452
 453         if (tcon != NULL) {
 454                 uint16_t com_code = le16_to_cpu(smb2_command);
 455                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 456                 cifs_stats_inc(&tcon->num_smbs_sent);
 457         }
 458
 459         return rc;
 460 }
 461
 462
 463 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
 464 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
 465 #define SMB2_POSIX_EXTENSIONS_AVAILABLE         cpu_to_le16(0x100)
 466
 467 static void
 468 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 469 {
 470         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 471         pneg_ctxt->DataLength = cpu_to_le16(38);
 472         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 473         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 474         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 475         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 476 }
 477
 478 static void
 479 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 480 {
 481         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 482         pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + le16 cipher */
 483         pneg_ctxt->CipherCount = cpu_to_le16(1);
 484 /* pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;*/ /* not supported yet */
 485         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_CCM;
 486 }
 487
 488 static void
 489 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 490 {
 491         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 492         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 493         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 494         pneg_ctxt->Name[0] = 0x93;
 495         pneg_ctxt->Name[1] = 0xAD;
 496         pneg_ctxt->Name[2] = 0x25;
 497         pneg_ctxt->Name[3] = 0x50;
 498         pneg_ctxt->Name[4] = 0x9C;
 499         pneg_ctxt->Name[5] = 0xB4;
 500         pneg_ctxt->Name[6] = 0x11;
 501         pneg_ctxt->Name[7] = 0xE7;
 502         pneg_ctxt->Name[8] = 0xB4;
 503         pneg_ctxt->Name[9] = 0x23;
 504         pneg_ctxt->Name[10] = 0x83;
 505         pneg_ctxt->Name[11] = 0xDE;
 506         pneg_ctxt->Name[12] = 0x96;
 507         pneg_ctxt->Name[13] = 0x8B;
 508         pneg_ctxt->Name[14] = 0xCD;
 509         pneg_ctxt->Name[15] = 0x7C;
 510 }
 511
 512 static void
 513 assemble_neg_contexts(struct smb2_negotiate_req *req,
 514                       unsigned int *total_len)
 515 {
 516         char *pneg_ctxt = (char *)req;
 517         unsigned int ctxt_len;
 518
 519         if (*total_len > 200) {
 520                 /* In case length corrupted don't want to overrun smb buffer */
 521                 cifs_dbg(VFS, "Bad frame length assembling neg contexts\n");
 522                 return;
 523         }
 524
 525         /*
 526          * round up total_len of fixed part of SMB3 negotiate request to 8
 527          * byte boundary before adding negotiate contexts
 528          */
 529         *total_len = roundup(*total_len, 8);
 530
 531         pneg_ctxt = (*total_len) + (char *)req;
 532         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 533
 534         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 535         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 536         *total_len += ctxt_len;
 537         pneg_ctxt += ctxt_len;
 538
 539         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 540         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 541         *total_len += ctxt_len;
 542         pneg_ctxt += ctxt_len;
 543
 544         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 545         *total_len += sizeof(struct smb2_posix_neg_context);
 546
 547         req->NegotiateContextCount = cpu_to_le16(3);
 548 }
 549
 550 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 551 {
 552         unsigned int len = le16_to_cpu(ctxt->DataLength);
 553
 554         /* If invalid preauth context warn but use what we requested, SHA-512 */
 555         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 556                 printk_once(KERN_WARNING "server sent bad preauth context\n");
 557                 return;
 558         }
 559         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 560                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
 561         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 562                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
 563 }
 564
 565 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 566                               struct smb2_encryption_neg_context *ctxt)
 567 {
 568         unsigned int len = le16_to_cpu(ctxt->DataLength);
 569
 570         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 571         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 572                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
 573                 return -EINVAL;
 574         }
 575
 576         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 577                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
 578                 return -EINVAL;
 579         }
 580         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 581         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 582             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 583                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
 584                 return -EINVAL;
 585         }
 586         server->cipher_type = ctxt->Ciphers[0];
 587         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 588         return 0;
 589 }
 590
 591 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 592                                      struct TCP_Server_Info *server,
 593                                      unsigned int len_of_smb)
 594 {
 595         struct smb2_neg_context *pctx;
 596         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 597         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 598         unsigned int len_of_ctxts, i;
 599         int rc = 0;
 600
 601         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 602         if (len_of_smb <= offset) {
 603                 cifs_dbg(VFS, "Invalid response: negotiate context offset\n");
 604                 return -EINVAL;
 605         }
 606
 607         len_of_ctxts = len_of_smb - offset;
 608
 609         for (i = 0; i < ctxt_cnt; i++) {
 610                 int clen;
 611                 /* check that offset is not beyond end of SMB */
 612                 if (len_of_ctxts == 0)
 613                         break;
 614
 615                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 616                         break;
 617
 618                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 619                 clen = le16_to_cpu(pctx->DataLength);
 620                 if (clen > len_of_ctxts)
 621                         break;
 622
 623                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 624                         decode_preauth_context(
 625                                 (struct smb2_preauth_neg_context *)pctx);
 626                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 627                         rc = decode_encrypt_ctx(server,
 628                                 (struct smb2_encryption_neg_context *)pctx);
 629                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 630                         server->posix_ext_supported = true;
 631                 else
 632                         cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
 633                                 le16_to_cpu(pctx->ContextType));
 634
 635                 if (rc)
 636                         break;
 637                 /* offsets must be 8 byte aligned */
 638                 clen = (clen + 7) & ~0x7;
 639                 offset += clen + sizeof(struct smb2_neg_context);
 640                 len_of_ctxts -= clen;
 641         }
 642         return rc;
 643 }
 644
 645 static struct create_posix *
 646 create_posix_buf(umode_t mode)
 647 {
 648         struct create_posix *buf;
 649
 650         buf = kzalloc(sizeof(struct create_posix),
 651                         GFP_KERNEL);
 652         if (!buf)
 653                 return NULL;
 654
 655         buf->ccontext.DataOffset =
 656                 cpu_to_le16(offsetof(struct create_posix, Mode));
 657         buf->ccontext.DataLength = cpu_to_le32(4);
 658         buf->ccontext.NameOffset =
 659                 cpu_to_le16(offsetof(struct create_posix, Name));
 660         buf->ccontext.NameLength = cpu_to_le16(16);
 661
 662         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 663         buf->Name[0] = 0x93;
 664         buf->Name[1] = 0xAD;
 665         buf->Name[2] = 0x25;
 666         buf->Name[3] = 0x50;
 667         buf->Name[4] = 0x9C;
 668         buf->Name[5] = 0xB4;
 669         buf->Name[6] = 0x11;
 670         buf->Name[7] = 0xE7;
 671         buf->Name[8] = 0xB4;
 672         buf->Name[9] = 0x23;
 673         buf->Name[10] = 0x83;
 674         buf->Name[11] = 0xDE;
 675         buf->Name[12] = 0x96;
 676         buf->Name[13] = 0x8B;
 677         buf->Name[14] = 0xCD;
 678         buf->Name[15] = 0x7C;
 679         buf->Mode = cpu_to_le32(mode);
 680         cifs_dbg(FYI, "mode on posix create 0%o", mode);
 681         return buf;
 682 }
 683
 684 static int
 685 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 686 {
 687         struct smb2_create_req *req = iov[0].iov_base;
 688         unsigned int num = *num_iovec;
 689
 690         iov[num].iov_base = create_posix_buf(mode);
 691         if (iov[num].iov_base == NULL)
 692                 return -ENOMEM;
 693         iov[num].iov_len = sizeof(struct create_posix);
 694         if (!req->CreateContextsOffset)
 695                 req->CreateContextsOffset = cpu_to_le32(
 696                                 sizeof(struct smb2_create_req) +
 697                                 iov[num - 1].iov_len);
 698         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 699         *num_iovec = num + 1;
 700         return 0;
 701 }
 702
 703
 704 /*
 705  *
 706  *      SMB2 Worker functions follow:
 707  *
 708  *      The general structure of the worker functions is:
 709  *      1) Call smb2_init (assembles SMB2 header)
 710  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 711  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 712  *      4) Decode SMB2 command specific fields in the fixed length area
 713  *      5) Decode variable length data area (if any for this SMB2 command type)
 714  *      6) Call free smb buffer
 715  *      7) return
 716  *
 717  */
 718
 719 int
 720 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 721 {
 722         struct smb_rqst rqst;
 723         struct smb2_negotiate_req *req;
 724         struct smb2_negotiate_rsp *rsp;
 725         struct kvec iov[1];
 726         struct kvec rsp_iov;
 727         int rc = 0;
 728         int resp_buftype;
 729         struct TCP_Server_Info *server = ses->server;
 730         int blob_offset, blob_length;
 731         char *security_blob;
 732         int flags = CIFS_NEG_OP;
 733         unsigned int total_len;
 734
 735         cifs_dbg(FYI, "Negotiate protocol\n");
 736
 737         if (!server) {
 738                 WARN(1, "%s: server is NULL!\n", __func__);
 739                 return -EIO;
 740         }
 741
 742         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 743         if (rc)
 744                 return rc;
 745
 746         req->sync_hdr.SessionId = 0;
 747
 748         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 749         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 750
 751         if (strcmp(ses->server->vals->version_string,
 752                    SMB3ANY_VERSION_STRING) == 0) {
 753                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 754                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 755                 req->DialectCount = cpu_to_le16(2);
 756                 total_len += 4;
 757         } else if (strcmp(ses->server->vals->version_string,
 758                    SMBDEFAULT_VERSION_STRING) == 0) {
 759                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 760                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 761                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 762                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 763                 req->DialectCount = cpu_to_le16(4);
 764                 total_len += 8;
 765         } else {
 766                 /* otherwise send specific dialect */
 767                 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 768                 req->DialectCount = cpu_to_le16(1);
 769                 total_len += 2;
 770         }
 771
 772         /* only one of SMB2 signing flags may be set in SMB2 request */
 773         if (ses->sign)
 774                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 775         else if (global_secflags & CIFSSEC_MAY_SIGN)
 776                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 777         else
 778                 req->SecurityMode = 0;
 779
 780         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 781
 782         /* ClientGUID must be zero for SMB2.02 dialect */
 783         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 784                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 785         else {
 786                 memcpy(req->ClientGUID, server->client_guid,
 787                         SMB2_CLIENT_GUID_SIZE);
 788                 if ((ses->server->vals->protocol_id == SMB311_PROT_ID) ||
 789                     (strcmp(ses->server->vals->version_string,
 790                      SMBDEFAULT_VERSION_STRING) == 0))
 791                         assemble_neg_contexts(req, &total_len);
 792         }
 793         iov[0].iov_base = (char *)req;
 794         iov[0].iov_len = total_len;
 795
 796         memset(&rqst, 0, sizeof(struct smb_rqst));
 797         rqst.rq_iov = iov;
 798         rqst.rq_nvec = 1;
 799
 800         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
 801         cifs_small_buf_release(req);
 802         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 803         /*
 804          * No tcon so can't do
 805          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 806          */
 807         if (rc == -EOPNOTSUPP) {
 808                 cifs_dbg(VFS, "Dialect not supported by server. Consider "
 809                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 810                         " older servers\n");
 811                 goto neg_exit;
 812         } else if (rc != 0)
 813                 goto neg_exit;
 814
 815         if (strcmp(ses->server->vals->version_string,
 816                    SMB3ANY_VERSION_STRING) == 0) {
 817                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 818                         cifs_dbg(VFS,
 819                                 "SMB2 dialect returned but not requested\n");
 820                         return -EIO;
 821                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 822                         cifs_dbg(VFS,
 823                                 "SMB2.1 dialect returned but not requested\n");
 824                         return -EIO;
 825                 }
 826         } else if (strcmp(ses->server->vals->version_string,
 827                    SMBDEFAULT_VERSION_STRING) == 0) {
 828                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 829                         cifs_dbg(VFS,
 830                                 "SMB2 dialect returned but not requested\n");
 831                         return -EIO;
 832                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 833                         /* ops set to 3.0 by default for default so update */
 834                         ses->server->ops = &smb21_operations;
 835                         ses->server->vals = &smb21_values;
 836                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 837                         ses->server->ops = &smb311_operations;
 838                         ses->server->vals = &smb311_values;
 839                 }
 840         } else if (le16_to_cpu(rsp->DialectRevision) !=
 841                                 ses->server->vals->protocol_id) {
 842                 /* if requested single dialect ensure returned dialect matched */
 843                 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 844                         le16_to_cpu(rsp->DialectRevision));
 845                 return -EIO;
 846         }
 847
 848         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 849
 850         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 851                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 852         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 853                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 854         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 855                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 856         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 857                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 858         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 859                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 860         else {
 861                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 862                          le16_to_cpu(rsp->DialectRevision));
 863                 rc = -EIO;
 864                 goto neg_exit;
 865         }
 866         server->dialect = le16_to_cpu(rsp->DialectRevision);
 867
 868         /*
 869          * Keep a copy of the hash after negprot. This hash will be
 870          * the starting hash value for all sessions made from this
 871          * server.
 872          */
 873         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 874                SMB2_PREAUTH_HASH_SIZE);
 875
 876         /* SMB2 only has an extended negflavor */
 877         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 878         /* set it to the maximum buffer size value we can send with 1 credit */
 879         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 880                                SMB2_MAX_BUFFER_SIZE);
 881         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 882         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 883         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 884         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 885                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 886                                 server->sec_mode);
 887         server->capabilities = le32_to_cpu(rsp->Capabilities);
 888         /* Internal types */
 889         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 890
 891         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 892                                                (struct smb2_sync_hdr *)rsp);
 893         /*
 894          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 895          * for us will be
 896          *      ses->sectype = RawNTLMSSP;
 897          * but for time being this is our only auth choice so doesn't matter.
 898          * We just found a server which sets blob length to zero expecting raw.
 899          */
 900         if (blob_length == 0) {
 901                 cifs_dbg(FYI, "missing security blob on negprot\n");
 902                 server->sec_ntlmssp = true;
 903         }
 904
 905         rc = cifs_enable_signing(server, ses->sign);
 906         if (rc)
 907                 goto neg_exit;
 908         if (blob_length) {
 909                 rc = decode_negTokenInit(security_blob, blob_length, server);
 910                 if (rc == 1)
 911                         rc = 0;
 912                 else if (rc == 0)
 913                         rc = -EIO;
 914         }
 915
 916         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 917                 if (rsp->NegotiateContextCount)
 918                         rc = smb311_decode_neg_context(rsp, server,
 919                                                        rsp_iov.iov_len);
 920                 else
 921                         cifs_dbg(VFS, "Missing expected negotiate contexts\n");
 922         }
 923 neg_exit:
 924         free_rsp_buf(resp_buftype, rsp);
 925         return rc;
 926 }
 927
 928 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 929 {
 930         int rc;
 931         struct validate_negotiate_info_req *pneg_inbuf;
 932         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 933         u32 rsplen;
 934         u32 inbuflen; /* max of 4 dialects */
 935
 936         cifs_dbg(FYI, "validate negotiate\n");
 937
 938         /* In SMB3.11 preauth integrity supersedes validate negotiate */
 939         if (tcon->ses->server->dialect == SMB311_PROT_ID)
 940                 return 0;
 941
 942         /*
 943          * validation ioctl must be signed, so no point sending this if we
 944          * can not sign it (ie are not known user).  Even if signing is not
 945          * required (enabled but not negotiated), in those cases we selectively
 946          * sign just this, the first and only signed request on a connection.
 947          * Having validation of negotiate info  helps reduce attack vectors.
 948          */
 949         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
 950                 return 0; /* validation requires signing */
 951
 952         if (tcon->ses->user_name == NULL) {
 953                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
 954                 return 0; /* validation requires signing */
 955         }
 956
 957         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
 958                 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
 959
 960         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
 961         if (!pneg_inbuf)
 962                 return -ENOMEM;
 963
 964         pneg_inbuf->Capabilities =
 965                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 966         memcpy(pneg_inbuf->Guid, tcon->ses->server->client_guid,
 967                                         SMB2_CLIENT_GUID_SIZE);
 968
 969         if (tcon->ses->sign)
 970                 pneg_inbuf->SecurityMode =
 971                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 972         else if (global_secflags & CIFSSEC_MAY_SIGN)
 973                 pneg_inbuf->SecurityMode =
 974                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 975         else
 976                 pneg_inbuf->SecurityMode = 0;
 977
 978
 979         if (strcmp(tcon->ses->server->vals->version_string,
 980                 SMB3ANY_VERSION_STRING) == 0) {
 981                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 982                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 983                 pneg_inbuf->DialectCount = cpu_to_le16(2);
 984                 /* structure is big enough for 3 dialects, sending only 2 */
 985                 inbuflen = sizeof(*pneg_inbuf) -
 986                                 (2 * sizeof(pneg_inbuf->Dialects[0]));
 987         } else if (strcmp(tcon->ses->server->vals->version_string,
 988                 SMBDEFAULT_VERSION_STRING) == 0) {
 989                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 990                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 991                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 992                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 993                 pneg_inbuf->DialectCount = cpu_to_le16(4);
 994                 /* structure is big enough for 3 dialects */
 995                 inbuflen = sizeof(*pneg_inbuf);
 996         } else {
 997                 /* otherwise specific dialect was requested */
 998                 pneg_inbuf->Dialects[0] =
 999                         cpu_to_le16(tcon->ses->server->vals->protocol_id);
1000                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1001                 /* structure is big enough for 3 dialects, sending only 1 */
1002                 inbuflen = sizeof(*pneg_inbuf) -
1003                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
1004         }
1005
1006         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1007                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1008                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1009                 (char **)&pneg_rsp, &rsplen);
1010         if (rc == -EOPNOTSUPP) {
1011                 /*
1012                  * Old Windows versions or Netapp SMB server can return
1013                  * not supported error. Client should accept it.
1014                  */
1015                 cifs_dbg(VFS, "Server does not support validate negotiate\n");
1016                 return 0;
1017         } else if (rc != 0) {
1018                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
1019                 rc = -EIO;
1020                 goto out_free_inbuf;
1021         }
1022
1023         rc = -EIO;
1024         if (rsplen != sizeof(*pneg_rsp)) {
1025                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
1026                          rsplen);
1027
1028                 /* relax check since Mac returns max bufsize allowed on ioctl */
1029                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1030                         goto out_free_rsp;
1031         }
1032
1033         /* check validate negotiate info response matches what we got earlier */
1034         if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
1035                 goto vneg_out;
1036
1037         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
1038                 goto vneg_out;
1039
1040         /* do not validate server guid because not saved at negprot time yet */
1041
1042         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1043               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
1044                 goto vneg_out;
1045
1046         /* validate negotiate successful */
1047         rc = 0;
1048         cifs_dbg(FYI, "validate negotiate info successful\n");
1049         goto out_free_rsp;
1050
1051 vneg_out:
1052         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1053 out_free_rsp:
1054         kfree(pneg_rsp);
1055 out_free_inbuf:
1056         kfree(pneg_inbuf);
1057         return rc;
1058 }
1059
1060 enum securityEnum
1061 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1062 {
1063         switch (requested) {
1064         case Kerberos:
1065         case RawNTLMSSP:
1066                 return requested;
1067         case NTLMv2:
1068                 return RawNTLMSSP;
1069         case Unspecified:
1070                 if (server->sec_ntlmssp &&
1071                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1072                         return RawNTLMSSP;
1073                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1074                         (global_secflags & CIFSSEC_MAY_KRB5))
1075                         return Kerberos;
1076                 /* Fallthrough */
1077         default:
1078                 return Unspecified;
1079         }
1080 }
1081
1082 struct SMB2_sess_data {
1083         unsigned int xid;
1084         struct cifs_ses *ses;
1085         struct nls_table *nls_cp;
1086         void (*func)(struct SMB2_sess_data *);
1087         int result;
1088         u64 previous_session;
1089
1090         /* we will send the SMB in three pieces:
1091          * a fixed length beginning part, an optional
1092          * SPNEGO blob (which can be zero length), and a
1093          * last part which will include the strings
1094          * and rest of bcc area. This allows us to avoid
1095          * a large buffer 17K allocation
1096          */
1097         int buf0_type;
1098         struct kvec iov[2];
1099 };
1100
1101 static int
1102 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1103 {
1104         int rc;
1105         struct cifs_ses *ses = sess_data->ses;
1106         struct smb2_sess_setup_req *req;
1107         struct TCP_Server_Info *server = ses->server;
1108         unsigned int total_len;
1109
1110         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
1111                              &total_len);
1112         if (rc)
1113                 return rc;
1114
1115         /* First session, not a reauthenticate */
1116         req->sync_hdr.SessionId = 0;
1117
1118         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
1119         req->PreviousSessionId = sess_data->previous_session;
1120
1121         req->Flags = 0; /* MBZ */
1122
1123         /* enough to enable echos and oplocks and one max size write */
1124         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1125
1126         /* only one of SMB2 signing flags may be set in SMB2 request */
1127         if (server->sign)
1128                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1129         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1130                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1131         else
1132                 req->SecurityMode = 0;
1133
1134         req->Capabilities = 0;
1135         req->Channel = 0; /* MBZ */
1136
1137         sess_data->iov[0].iov_base = (char *)req;
1138         /* 1 for pad */
1139         sess_data->iov[0].iov_len = total_len - 1;
1140         /*
1141          * This variable will be used to clear the buffer
1142          * allocated above in case of any error in the calling function.
1143          */
1144         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1145
1146         return 0;
1147 }
1148
1149 static void
1150 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1151 {
1152         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1153         sess_data->buf0_type = CIFS_NO_BUFFER;
1154 }
1155
1156 static int
1157 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1158 {
1159         int rc;
1160         struct smb_rqst rqst;
1161         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1162         struct kvec rsp_iov = { NULL, 0 };
1163
1164         /* Testing shows that buffer offset must be at location of Buffer[0] */
1165         req->SecurityBufferOffset =
1166                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1167         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1168
1169         memset(&rqst, 0, sizeof(struct smb_rqst));
1170         rqst.rq_iov = sess_data->iov;
1171         rqst.rq_nvec = 2;
1172
1173         /* BB add code to build os and lm fields */
1174         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1175                             &rqst,
1176                             &sess_data->buf0_type,
1177                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1178         cifs_small_buf_release(sess_data->iov[0].iov_base);
1179         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1180
1181         return rc;
1182 }
1183
1184 static int
1185 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1186 {
1187         int rc = 0;
1188         struct cifs_ses *ses = sess_data->ses;
1189
1190         mutex_lock(&ses->server->srv_mutex);
1191         if (ses->server->ops->generate_signingkey) {
1192                 rc = ses->server->ops->generate_signingkey(ses);
1193                 if (rc) {
1194                         cifs_dbg(FYI,
1195                                 "SMB3 session key generation failed\n");
1196                         mutex_unlock(&ses->server->srv_mutex);
1197                         return rc;
1198                 }
1199         }
1200         if (!ses->server->session_estab) {
1201                 ses->server->sequence_number = 0x2;
1202                 ses->server->session_estab = true;
1203         }
1204         mutex_unlock(&ses->server->srv_mutex);
1205
1206         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1207         spin_lock(&GlobalMid_Lock);
1208         ses->status = CifsGood;
1209         ses->need_reconnect = false;
1210         spin_unlock(&GlobalMid_Lock);
1211         return rc;
1212 }
1213
1214 #ifdef CONFIG_CIFS_UPCALL
1215 static void
1216 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1217 {
1218         int rc;
1219         struct cifs_ses *ses = sess_data->ses;
1220         struct cifs_spnego_msg *msg;
1221         struct key *spnego_key = NULL;
1222         struct smb2_sess_setup_rsp *rsp = NULL;
1223
1224         rc = SMB2_sess_alloc_buffer(sess_data);
1225         if (rc)
1226                 goto out;
1227
1228         spnego_key = cifs_get_spnego_key(ses);
1229         if (IS_ERR(spnego_key)) {
1230                 rc = PTR_ERR(spnego_key);
1231                 spnego_key = NULL;
1232                 goto out;
1233         }
1234
1235         msg = spnego_key->payload.data[0];
1236         /*
1237          * check version field to make sure that cifs.upcall is
1238          * sending us a response in an expected form
1239          */
1240         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1241                 cifs_dbg(VFS,
1242                           "bad cifs.upcall version. Expected %d got %d",
1243                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1244                 rc = -EKEYREJECTED;
1245                 goto out_put_spnego_key;
1246         }
1247
1248         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1249                                          GFP_KERNEL);
1250         if (!ses->auth_key.response) {
1251                 cifs_dbg(VFS,
1252                         "Kerberos can't allocate (%u bytes) memory",
1253                         msg->sesskey_len);
1254                 rc = -ENOMEM;
1255                 goto out_put_spnego_key;
1256         }
1257         ses->auth_key.len = msg->sesskey_len;
1258
1259         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1260         sess_data->iov[1].iov_len = msg->secblob_len;
1261
1262         rc = SMB2_sess_sendreceive(sess_data);
1263         if (rc)
1264                 goto out_put_spnego_key;
1265
1266         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1267         ses->Suid = rsp->sync_hdr.SessionId;
1268
1269         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1270
1271         rc = SMB2_sess_establish_session(sess_data);
1272 out_put_spnego_key:
1273         key_invalidate(spnego_key);
1274         key_put(spnego_key);
1275 out:
1276         sess_data->result = rc;
1277         sess_data->func = NULL;
1278         SMB2_sess_free_buffer(sess_data);
1279 }
1280 #else
1281 static void
1282 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1283 {
1284         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1285         sess_data->result = -EOPNOTSUPP;
1286         sess_data->func = NULL;
1287 }
1288 #endif
1289
1290 static void
1291 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1292
1293 static void
1294 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1295 {
1296         int rc;
1297         struct cifs_ses *ses = sess_data->ses;
1298         struct smb2_sess_setup_rsp *rsp = NULL;
1299         char *ntlmssp_blob = NULL;
1300         bool use_spnego = false; /* else use raw ntlmssp */
1301         u16 blob_length = 0;
1302
1303         /*
1304          * If memory allocation is successful, caller of this function
1305          * frees it.
1306          */
1307         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1308         if (!ses->ntlmssp) {
1309                 rc = -ENOMEM;
1310                 goto out_err;
1311         }
1312         ses->ntlmssp->sesskey_per_smbsess = true;
1313
1314         rc = SMB2_sess_alloc_buffer(sess_data);
1315         if (rc)
1316                 goto out_err;
1317
1318         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1319                                GFP_KERNEL);
1320         if (ntlmssp_blob == NULL) {
1321                 rc = -ENOMEM;
1322                 goto out;
1323         }
1324
1325         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1326         if (use_spnego) {
1327                 /* BB eventually need to add this */
1328                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1329                 rc = -EOPNOTSUPP;
1330                 goto out;
1331         } else {
1332                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1333                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1334         }
1335         sess_data->iov[1].iov_base = ntlmssp_blob;
1336         sess_data->iov[1].iov_len = blob_length;
1337
1338         rc = SMB2_sess_sendreceive(sess_data);
1339         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1340
1341         /* If true, rc here is expected and not an error */
1342         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1343                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1344                 rc = 0;
1345
1346         if (rc)
1347                 goto out;
1348
1349         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1350                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1351                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1352                         le16_to_cpu(rsp->SecurityBufferOffset));
1353                 rc = -EIO;
1354                 goto out;
1355         }
1356         rc = decode_ntlmssp_challenge(rsp->Buffer,
1357                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1358         if (rc)
1359                 goto out;
1360
1361         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1362
1363
1364         ses->Suid = rsp->sync_hdr.SessionId;
1365         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1366
1367 out:
1368         kfree(ntlmssp_blob);
1369         SMB2_sess_free_buffer(sess_data);
1370         if (!rc) {
1371                 sess_data->result = 0;
1372                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1373                 return;
1374         }
1375 out_err:
1376         kfree(ses->ntlmssp);
1377         ses->ntlmssp = NULL;
1378         sess_data->result = rc;
1379         sess_data->func = NULL;
1380 }
1381
1382 static void
1383 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1384 {
1385         int rc;
1386         struct cifs_ses *ses = sess_data->ses;
1387         struct smb2_sess_setup_req *req;
1388         struct smb2_sess_setup_rsp *rsp = NULL;
1389         unsigned char *ntlmssp_blob = NULL;
1390         bool use_spnego = false; /* else use raw ntlmssp */
1391         u16 blob_length = 0;
1392
1393         rc = SMB2_sess_alloc_buffer(sess_data);
1394         if (rc)
1395                 goto out;
1396
1397         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1398         req->sync_hdr.SessionId = ses->Suid;
1399
1400         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1401                                         sess_data->nls_cp);
1402         if (rc) {
1403                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1404                 goto out;
1405         }
1406
1407         if (use_spnego) {
1408                 /* BB eventually need to add this */
1409                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1410                 rc = -EOPNOTSUPP;
1411                 goto out;
1412         }
1413         sess_data->iov[1].iov_base = ntlmssp_blob;
1414         sess_data->iov[1].iov_len = blob_length;
1415
1416         rc = SMB2_sess_sendreceive(sess_data);
1417         if (rc)
1418                 goto out;
1419
1420         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1421
1422         ses->Suid = rsp->sync_hdr.SessionId;
1423         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1424
1425         rc = SMB2_sess_establish_session(sess_data);
1426 out:
1427         kfree(ntlmssp_blob);
1428         SMB2_sess_free_buffer(sess_data);
1429         kfree(ses->ntlmssp);
1430         ses->ntlmssp = NULL;
1431         sess_data->result = rc;
1432         sess_data->func = NULL;
1433 }
1434
1435 static int
1436 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1437 {
1438         int type;
1439
1440         type = smb2_select_sectype(ses->server, ses->sectype);
1441         cifs_dbg(FYI, "sess setup type %d\n", type);
1442         if (type == Unspecified) {
1443                 cifs_dbg(VFS,
1444                         "Unable to select appropriate authentication method!");
1445                 return -EINVAL;
1446         }
1447
1448         switch (type) {
1449         case Kerberos:
1450                 sess_data->func = SMB2_auth_kerberos;
1451                 break;
1452         case RawNTLMSSP:
1453                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1454                 break;
1455         default:
1456                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1457                 return -EOPNOTSUPP;
1458         }
1459
1460         return 0;
1461 }
1462
1463 int
1464 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1465                 const struct nls_table *nls_cp)
1466 {
1467         int rc = 0;
1468         struct TCP_Server_Info *server = ses->server;
1469         struct SMB2_sess_data *sess_data;
1470
1471         cifs_dbg(FYI, "Session Setup\n");
1472
1473         if (!server) {
1474                 WARN(1, "%s: server is NULL!\n", __func__);
1475                 return -EIO;
1476         }
1477
1478         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1479         if (!sess_data)
1480                 return -ENOMEM;
1481
1482         rc = SMB2_select_sec(ses, sess_data);
1483         if (rc)
1484                 goto out;
1485         sess_data->xid = xid;
1486         sess_data->ses = ses;
1487         sess_data->buf0_type = CIFS_NO_BUFFER;
1488         sess_data->nls_cp = (struct nls_table *) nls_cp;
1489         sess_data->previous_session = ses->Suid;
1490
1491         /*
1492          * Initialize the session hash with the server one.
1493          */
1494         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1495                SMB2_PREAUTH_HASH_SIZE);
1496
1497         while (sess_data->func)
1498                 sess_data->func(sess_data);
1499
1500         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1501                 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1502         rc = sess_data->result;
1503 out:
1504         kfree(sess_data);
1505         return rc;
1506 }
1507
1508 int
1509 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1510 {
1511         struct smb_rqst rqst;
1512         struct smb2_logoff_req *req; /* response is also trivial struct */
1513         int rc = 0;
1514         struct TCP_Server_Info *server;
1515         int flags = 0;
1516         unsigned int total_len;
1517         struct kvec iov[1];
1518         struct kvec rsp_iov;
1519         int resp_buf_type;
1520
1521         cifs_dbg(FYI, "disconnect session %p\n", ses);
1522
1523         if (ses && (ses->server))
1524                 server = ses->server;
1525         else
1526                 return -EIO;
1527
1528         /* no need to send SMB logoff if uid already closed due to reconnect */
1529         if (ses->need_reconnect)
1530                 goto smb2_session_already_dead;
1531
1532         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1533         if (rc)
1534                 return rc;
1535
1536          /* since no tcon, smb2_init can not do this, so do here */
1537         req->sync_hdr.SessionId = ses->Suid;
1538
1539         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1540                 flags |= CIFS_TRANSFORM_REQ;
1541         else if (server->sign)
1542                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1543
1544         flags |= CIFS_NO_RESP;
1545
1546         iov[0].iov_base = (char *)req;
1547         iov[0].iov_len = total_len;
1548
1549         memset(&rqst, 0, sizeof(struct smb_rqst));
1550         rqst.rq_iov = iov;
1551         rqst.rq_nvec = 1;
1552
1553         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1554         cifs_small_buf_release(req);
1555         /*
1556          * No tcon so can't do
1557          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1558          */
1559
1560 smb2_session_already_dead:
1561         return rc;
1562 }
1563
1564 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1565 {
1566         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1567 }
1568
1569 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1570
1571 /* These are similar values to what Windows uses */
1572 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1573 {
1574         tcon->max_chunks = 256;
1575         tcon->max_bytes_chunk = 1048576;
1576         tcon->max_bytes_copy = 16777216;
1577 }
1578
1579 int
1580 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1581           struct cifs_tcon *tcon, const struct nls_table *cp)
1582 {
1583         struct smb_rqst rqst;
1584         struct smb2_tree_connect_req *req;
1585         struct smb2_tree_connect_rsp *rsp = NULL;
1586         struct kvec iov[2];
1587         struct kvec rsp_iov = { NULL, 0 };
1588         int rc = 0;
1589         int resp_buftype;
1590         int unc_path_len;
1591         __le16 *unc_path = NULL;
1592         int flags = 0;
1593         unsigned int total_len;
1594
1595         cifs_dbg(FYI, "TCON\n");
1596
1597         if (!(ses->server) || !tree)
1598                 return -EIO;
1599
1600         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1601         if (unc_path == NULL)
1602                 return -ENOMEM;
1603
1604         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1605         unc_path_len *= 2;
1606         if (unc_path_len < 2) {
1607                 kfree(unc_path);
1608                 return -EINVAL;
1609         }
1610
1611         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1612         tcon->tid = 0;
1613         atomic_set(&tcon->num_remote_opens, 0);
1614         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1615                              &total_len);
1616         if (rc) {
1617                 kfree(unc_path);
1618                 return rc;
1619         }
1620
1621         if (smb3_encryption_required(tcon))
1622                 flags |= CIFS_TRANSFORM_REQ;
1623
1624         iov[0].iov_base = (char *)req;
1625         /* 1 for pad */
1626         iov[0].iov_len = total_len - 1;
1627
1628         /* Testing shows that buffer offset must be at location of Buffer[0] */
1629         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1630                         - 1 /* pad */);
1631         req->PathLength = cpu_to_le16(unc_path_len - 2);
1632         iov[1].iov_base = unc_path;
1633         iov[1].iov_len = unc_path_len;
1634
1635         /*
1636          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1637          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1638          * (Samba servers don't always set the flag so also check if null user)
1639          */
1640         if ((ses->server->dialect == SMB311_PROT_ID) &&
1641             !smb3_encryption_required(tcon) &&
1642             !(ses->session_flags &
1643                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1644             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1645                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1646
1647         memset(&rqst, 0, sizeof(struct smb_rqst));
1648         rqst.rq_iov = iov;
1649         rqst.rq_nvec = 2;
1650
1651         /* Need 64 for max size write so ask for more in case not there yet */
1652         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1653
1654         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1655         cifs_small_buf_release(req);
1656         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1657         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1658         if (rc != 0) {
1659                 if (tcon) {
1660                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1661                         tcon->need_reconnect = true;
1662                 }
1663                 goto tcon_error_exit;
1664         }
1665
1666         switch (rsp->ShareType) {
1667         case SMB2_SHARE_TYPE_DISK:
1668                 cifs_dbg(FYI, "connection to disk share\n");
1669                 break;
1670         case SMB2_SHARE_TYPE_PIPE:
1671                 tcon->pipe = true;
1672                 cifs_dbg(FYI, "connection to pipe share\n");
1673                 break;
1674         case SMB2_SHARE_TYPE_PRINT:
1675                 tcon->print = true;
1676                 cifs_dbg(FYI, "connection to printer\n");
1677                 break;
1678         default:
1679                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1680                 rc = -EOPNOTSUPP;
1681                 goto tcon_error_exit;
1682         }
1683
1684         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1685         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1686         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1687         tcon->tidStatus = CifsGood;
1688         tcon->need_reconnect = false;
1689         tcon->tid = rsp->sync_hdr.TreeId;
1690         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1691
1692         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1693             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1694                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1695
1696         if (tcon->seal &&
1697             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1698                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1699
1700         init_copy_chunk_defaults(tcon);
1701         if (tcon->ses->server->ops->validate_negotiate)
1702                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1703 tcon_exit:
1704
1705         free_rsp_buf(resp_buftype, rsp);
1706         kfree(unc_path);
1707         return rc;
1708
1709 tcon_error_exit:
1710         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1711                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1712         }
1713         goto tcon_exit;
1714 }
1715
1716 int
1717 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1718 {
1719         struct smb_rqst rqst;
1720         struct smb2_tree_disconnect_req *req; /* response is trivial */
1721         int rc = 0;
1722         struct cifs_ses *ses = tcon->ses;
1723         int flags = 0;
1724         unsigned int total_len;
1725         struct kvec iov[1];
1726         struct kvec rsp_iov;
1727         int resp_buf_type;
1728
1729         cifs_dbg(FYI, "Tree Disconnect\n");
1730
1731         if (!ses || !(ses->server))
1732                 return -EIO;
1733
1734         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1735                 return 0;
1736
1737         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1738                              &total_len);
1739         if (rc)
1740                 return rc;
1741
1742         if (smb3_encryption_required(tcon))
1743                 flags |= CIFS_TRANSFORM_REQ;
1744
1745         flags |= CIFS_NO_RESP;
1746
1747         iov[0].iov_base = (char *)req;
1748         iov[0].iov_len = total_len;
1749
1750         memset(&rqst, 0, sizeof(struct smb_rqst));
1751         rqst.rq_iov = iov;
1752         rqst.rq_nvec = 1;
1753
1754         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1755         cifs_small_buf_release(req);
1756         if (rc)
1757                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1758
1759         return rc;
1760 }
1761
1762
1763 static struct create_durable *
1764 create_durable_buf(void)
1765 {
1766         struct create_durable *buf;
1767
1768         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1769         if (!buf)
1770                 return NULL;
1771
1772         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1773                                         (struct create_durable, Data));
1774         buf->ccontext.DataLength = cpu_to_le32(16);
1775         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1776                                 (struct create_durable, Name));
1777         buf->ccontext.NameLength = cpu_to_le16(4);
1778         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1779         buf->Name[0] = 'D';
1780         buf->Name[1] = 'H';
1781         buf->Name[2] = 'n';
1782         buf->Name[3] = 'Q';
1783         return buf;
1784 }
1785
1786 static struct create_durable *
1787 create_reconnect_durable_buf(struct cifs_fid *fid)
1788 {
1789         struct create_durable *buf;
1790
1791         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1792         if (!buf)
1793                 return NULL;
1794
1795         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1796                                         (struct create_durable, Data));
1797         buf->ccontext.DataLength = cpu_to_le32(16);
1798         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1799                                 (struct create_durable, Name));
1800         buf->ccontext.NameLength = cpu_to_le16(4);
1801         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1802         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1803         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1804         buf->Name[0] = 'D';
1805         buf->Name[1] = 'H';
1806         buf->Name[2] = 'n';
1807         buf->Name[3] = 'C';
1808         return buf;
1809 }
1810
1811 __u8
1812 smb2_parse_lease_state(struct TCP_Server_Info *server,
1813                        struct smb2_create_rsp *rsp,
1814                        unsigned int *epoch, char *lease_key)
1815 {
1816         char *data_offset;
1817         struct create_context *cc;
1818         unsigned int next;
1819         unsigned int remaining;
1820         char *name;
1821
1822         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1823         remaining = le32_to_cpu(rsp->CreateContextsLength);
1824         cc = (struct create_context *)data_offset;
1825         while (remaining >= sizeof(struct create_context)) {
1826                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1827                 if (le16_to_cpu(cc->NameLength) == 4 &&
1828                     strncmp(name, "RqLs", 4) == 0)
1829                         return server->ops->parse_lease_buf(cc, epoch,
1830                                                             lease_key);
1831
1832                 next = le32_to_cpu(cc->Next);
1833                 if (!next)
1834                         break;
1835                 remaining -= next;
1836                 cc = (struct create_context *)((char *)cc + next);
1837         }
1838
1839         return 0;
1840 }
1841
1842 static int
1843 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1844                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1845 {
1846         struct smb2_create_req *req = iov[0].iov_base;
1847         unsigned int num = *num_iovec;
1848
1849         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1850         if (iov[num].iov_base == NULL)
1851                 return -ENOMEM;
1852         iov[num].iov_len = server->vals->create_lease_size;
1853         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1854         if (!req->CreateContextsOffset)
1855                 req->CreateContextsOffset = cpu_to_le32(
1856                                 sizeof(struct smb2_create_req) +
1857                                 iov[num - 1].iov_len);
1858         le32_add_cpu(&req->CreateContextsLength,
1859                      server->vals->create_lease_size);
1860         *num_iovec = num + 1;
1861         return 0;
1862 }
1863
1864 static struct create_durable_v2 *
1865 create_durable_v2_buf(struct cifs_open_parms *oparms)
1866 {
1867         struct cifs_fid *pfid = oparms->fid;
1868         struct create_durable_v2 *buf;
1869
1870         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1871         if (!buf)
1872                 return NULL;
1873
1874         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1875                                         (struct create_durable_v2, dcontext));
1876         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1877         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1878                                 (struct create_durable_v2, Name));
1879         buf->ccontext.NameLength = cpu_to_le16(4);
1880
1881         /*
1882          * NB: Handle timeout defaults to 0, which allows server to choose
1883          * (most servers default to 120 seconds) and most clients default to 0.
1884          * This can be overridden at mount ("handletimeout=") if the user wants
1885          * a different persistent (or resilient) handle timeout for all opens
1886          * opens on a particular SMB3 mount.
1887          */
1888         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
1889         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1890         generate_random_uuid(buf->dcontext.CreateGuid);
1891         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1892
1893         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1894         buf->Name[0] = 'D';
1895         buf->Name[1] = 'H';
1896         buf->Name[2] = '2';
1897         buf->Name[3] = 'Q';
1898         return buf;
1899 }
1900
1901 static struct create_durable_handle_reconnect_v2 *
1902 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1903 {
1904         struct create_durable_handle_reconnect_v2 *buf;
1905
1906         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1907                         GFP_KERNEL);
1908         if (!buf)
1909                 return NULL;
1910
1911         buf->ccontext.DataOffset =
1912                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1913                                      dcontext));
1914         buf->ccontext.DataLength =
1915                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1916         buf->ccontext.NameOffset =
1917                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1918                             Name));
1919         buf->ccontext.NameLength = cpu_to_le16(4);
1920
1921         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1922         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1923         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1924         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1925
1926         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1927         buf->Name[0] = 'D';
1928         buf->Name[1] = 'H';
1929         buf->Name[2] = '2';
1930         buf->Name[3] = 'C';
1931         return buf;
1932 }
1933
1934 static int
1935 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1936                     struct cifs_open_parms *oparms)
1937 {
1938         struct smb2_create_req *req = iov[0].iov_base;
1939         unsigned int num = *num_iovec;
1940
1941         iov[num].iov_base = create_durable_v2_buf(oparms);
1942         if (iov[num].iov_base == NULL)
1943                 return -ENOMEM;
1944         iov[num].iov_len = sizeof(struct create_durable_v2);
1945         if (!req->CreateContextsOffset)
1946                 req->CreateContextsOffset =
1947                         cpu_to_le32(sizeof(struct smb2_create_req) +
1948                                                                 iov[1].iov_len);
1949         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1950         *num_iovec = num + 1;
1951         return 0;
1952 }
1953
1954 static int
1955 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1956                     struct cifs_open_parms *oparms)
1957 {
1958         struct smb2_create_req *req = iov[0].iov_base;
1959         unsigned int num = *num_iovec;
1960
1961         /* indicate that we don't need to relock the file */
1962         oparms->reconnect = false;
1963
1964         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1965         if (iov[num].iov_base == NULL)
1966                 return -ENOMEM;
1967         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1968         if (!req->CreateContextsOffset)
1969                 req->CreateContextsOffset =
1970                         cpu_to_le32(sizeof(struct smb2_create_req) +
1971                                                                 iov[1].iov_len);
1972         le32_add_cpu(&req->CreateContextsLength,
1973                         sizeof(struct create_durable_handle_reconnect_v2));
1974         *num_iovec = num + 1;
1975         return 0;
1976 }
1977
1978 static int
1979 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1980                     struct cifs_open_parms *oparms, bool use_persistent)
1981 {
1982         struct smb2_create_req *req = iov[0].iov_base;
1983         unsigned int num = *num_iovec;
1984
1985         if (use_persistent) {
1986                 if (oparms->reconnect)
1987                         return add_durable_reconnect_v2_context(iov, num_iovec,
1988                                                                 oparms);
1989                 else
1990                         return add_durable_v2_context(iov, num_iovec, oparms);
1991         }
1992
1993         if (oparms->reconnect) {
1994                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1995                 /* indicate that we don't need to relock the file */
1996                 oparms->reconnect = false;
1997         } else
1998                 iov[num].iov_base = create_durable_buf();
1999         if (iov[num].iov_base == NULL)
2000                 return -ENOMEM;
2001         iov[num].iov_len = sizeof(struct create_durable);
2002         if (!req->CreateContextsOffset)
2003                 req->CreateContextsOffset =
2004                         cpu_to_le32(sizeof(struct smb2_create_req) +
2005                                                                 iov[1].iov_len);
2006         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2007         *num_iovec = num + 1;
2008         return 0;
2009 }
2010
2011 /* See MS-SMB2 2.2.13.2.7 */
2012 static struct crt_twarp_ctxt *
2013 create_twarp_buf(__u64 timewarp)
2014 {
2015         struct crt_twarp_ctxt *buf;
2016
2017         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2018         if (!buf)
2019                 return NULL;
2020
2021         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2022                                         (struct crt_twarp_ctxt, Timestamp));
2023         buf->ccontext.DataLength = cpu_to_le32(8);
2024         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2025                                 (struct crt_twarp_ctxt, Name));
2026         buf->ccontext.NameLength = cpu_to_le16(4);
2027         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2028         buf->Name[0] = 'T';
2029         buf->Name[1] = 'W';
2030         buf->Name[2] = 'r';
2031         buf->Name[3] = 'p';
2032         buf->Timestamp = cpu_to_le64(timewarp);
2033         return buf;
2034 }
2035
2036 /* See MS-SMB2 2.2.13.2.7 */
2037 static int
2038 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2039 {
2040         struct smb2_create_req *req = iov[0].iov_base;
2041         unsigned int num = *num_iovec;
2042
2043         iov[num].iov_base = create_twarp_buf(timewarp);
2044         if (iov[num].iov_base == NULL)
2045                 return -ENOMEM;
2046         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2047         if (!req->CreateContextsOffset)
2048                 req->CreateContextsOffset = cpu_to_le32(
2049                                 sizeof(struct smb2_create_req) +
2050                                 iov[num - 1].iov_len);
2051         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2052         *num_iovec = num + 1;
2053         return 0;
2054 }
2055
2056 static int
2057 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2058                             const char *treename, const __le16 *path)
2059 {
2060         int treename_len, path_len;
2061         struct nls_table *cp;
2062         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2063
2064         /*
2065          * skip leading "\\"
2066          */
2067         treename_len = strlen(treename);
2068         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2069                 return -EINVAL;
2070
2071         treename += 2;
2072         treename_len -= 2;
2073
2074         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2075
2076         /*
2077          * make room for one path separator between the treename and
2078          * path
2079          */
2080         *out_len = treename_len + 1 + path_len;
2081
2082         /*
2083          * final path needs to be null-terminated UTF16 with a
2084          * size aligned to 8
2085          */
2086
2087         *out_size = roundup((*out_len+1)*2, 8);
2088         *out_path = kzalloc(*out_size, GFP_KERNEL);
2089         if (!*out_path)
2090                 return -ENOMEM;
2091
2092         cp = load_nls_default();
2093         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2094         UniStrcat(*out_path, sep);
2095         UniStrcat(*out_path, path);
2096         unload_nls(cp);
2097
2098         return 0;
2099 }
2100
2101 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2102                                umode_t mode, struct cifs_tcon *tcon,
2103                                const char *full_path,
2104                                struct cifs_sb_info *cifs_sb)
2105 {
2106         struct smb_rqst rqst;
2107         struct smb2_create_req *req;
2108         struct smb2_create_rsp *rsp = NULL;
2109         struct cifs_ses *ses = tcon->ses;
2110         struct kvec iov[3]; /* make sure at least one for each open context */
2111         struct kvec rsp_iov = {NULL, 0};
2112         int resp_buftype;
2113         int uni_path_len;
2114         __le16 *copy_path = NULL;
2115         int copy_size;
2116         int rc = 0;
2117         unsigned int n_iov = 2;
2118         __u32 file_attributes = 0;
2119         char *pc_buf = NULL;
2120         int flags = 0;
2121         unsigned int total_len;
2122         __le16 *utf16_path = NULL;
2123
2124         cifs_dbg(FYI, "mkdir\n");
2125
2126         /* resource #1: path allocation */
2127         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2128         if (!utf16_path)
2129                 return -ENOMEM;
2130
2131         if (!ses || !(ses->server)) {
2132                 rc = -EIO;
2133                 goto err_free_path;
2134         }
2135
2136         /* resource #2: request */
2137         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2138         if (rc)
2139                 goto err_free_path;
2140
2141
2142         if (smb3_encryption_required(tcon))
2143                 flags |= CIFS_TRANSFORM_REQ;
2144
2145         req->ImpersonationLevel = IL_IMPERSONATION;
2146         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2147         /* File attributes ignored on open (used in create though) */
2148         req->FileAttributes = cpu_to_le32(file_attributes);
2149         req->ShareAccess = FILE_SHARE_ALL_LE;
2150         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2151         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2152
2153         iov[0].iov_base = (char *)req;
2154         /* -1 since last byte is buf[0] which is sent below (path) */
2155         iov[0].iov_len = total_len - 1;
2156
2157         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2158
2159         /* [MS-SMB2] 2.2.13 NameOffset:
2160          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2161          * the SMB2 header, the file name includes a prefix that will
2162          * be processed during DFS name normalization as specified in
2163          * section 3.3.5.9. Otherwise, the file name is relative to
2164          * the share that is identified by the TreeId in the SMB2
2165          * header.
2166          */
2167         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2168                 int name_len;
2169
2170                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2171                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2172                                                  &name_len,
2173                                                  tcon->treeName, utf16_path);
2174                 if (rc)
2175                         goto err_free_req;
2176
2177                 req->NameLength = cpu_to_le16(name_len * 2);
2178                 uni_path_len = copy_size;
2179                 /* free before overwriting resource */
2180                 kfree(utf16_path);
2181                 utf16_path = copy_path;
2182         } else {
2183                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2184                 /* MUST set path len (NameLength) to 0 opening root of share */
2185                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2186                 if (uni_path_len % 8 != 0) {
2187                         copy_size = roundup(uni_path_len, 8);
2188                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2189                         if (!copy_path) {
2190                                 rc = -ENOMEM;
2191                                 goto err_free_req;
2192                         }
2193                         memcpy((char *)copy_path, (const char *)utf16_path,
2194                                uni_path_len);
2195                         uni_path_len = copy_size;
2196                         /* free before overwriting resource */
2197                         kfree(utf16_path);
2198                         utf16_path = copy_path;
2199                 }
2200         }
2201
2202         iov[1].iov_len = uni_path_len;
2203         iov[1].iov_base = utf16_path;
2204         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2205
2206         if (tcon->posix_extensions) {
2207                 /* resource #3: posix buf */
2208                 rc = add_posix_context(iov, &n_iov, mode);
2209                 if (rc)
2210                         goto err_free_req;
2211                 pc_buf = iov[n_iov-1].iov_base;
2212         }
2213
2214
2215         memset(&rqst, 0, sizeof(struct smb_rqst));
2216         rqst.rq_iov = iov;
2217         rqst.rq_nvec = n_iov;
2218
2219         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2220                                     FILE_WRITE_ATTRIBUTES);
2221         /* resource #4: response buffer */
2222         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2223         if (rc) {
2224                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2225                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2226                                            CREATE_NOT_FILE,
2227                                            FILE_WRITE_ATTRIBUTES, rc);
2228                 goto err_free_rsp_buf;
2229         }
2230
2231         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2232         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2233                                     ses->Suid, CREATE_NOT_FILE,
2234                                     FILE_WRITE_ATTRIBUTES);
2235
2236         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2237
2238         /* Eventually save off posix specific response info and timestaps */
2239
2240 err_free_rsp_buf:
2241         free_rsp_buf(resp_buftype, rsp);
2242         kfree(pc_buf);
2243 err_free_req:
2244         cifs_small_buf_release(req);
2245 err_free_path:
2246         kfree(utf16_path);
2247         return rc;
2248 }
2249
2250 int
2251 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2252                struct cifs_open_parms *oparms, __le16 *path)
2253 {
2254         struct TCP_Server_Info *server = tcon->ses->server;
2255         struct smb2_create_req *req;
2256         unsigned int n_iov = 2;
2257         __u32 file_attributes = 0;
2258         int copy_size;
2259         int uni_path_len;
2260         unsigned int total_len;
2261         struct kvec *iov = rqst->rq_iov;
2262         __le16 *copy_path;
2263         int rc;
2264
2265         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2266         if (rc)
2267                 return rc;
2268
2269         iov[0].iov_base = (char *)req;
2270         /* -1 since last byte is buf[0] which is sent below (path) */
2271         iov[0].iov_len = total_len - 1;
2272
2273         if (oparms->create_options & CREATE_OPTION_READONLY)
2274                 file_attributes |= ATTR_READONLY;
2275         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2276                 file_attributes |= ATTR_SYSTEM;
2277
2278         req->ImpersonationLevel = IL_IMPERSONATION;
2279         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2280         /* File attributes ignored on open (used in create though) */
2281         req->FileAttributes = cpu_to_le32(file_attributes);
2282         req->ShareAccess = FILE_SHARE_ALL_LE;
2283         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2284         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2285         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2286
2287         /* [MS-SMB2] 2.2.13 NameOffset:
2288          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2289          * the SMB2 header, the file name includes a prefix that will
2290          * be processed during DFS name normalization as specified in
2291          * section 3.3.5.9. Otherwise, the file name is relative to
2292          * the share that is identified by the TreeId in the SMB2
2293          * header.
2294          */
2295         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2296                 int name_len;
2297
2298                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2299                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2300                                                  &name_len,
2301                                                  tcon->treeName, path);
2302                 if (rc)
2303                         return rc;
2304                 req->NameLength = cpu_to_le16(name_len * 2);
2305                 uni_path_len = copy_size;
2306                 path = copy_path;
2307         } else {
2308                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2309                 /* MUST set path len (NameLength) to 0 opening root of share */
2310                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2311                 copy_size = uni_path_len;
2312                 if (copy_size % 8 != 0)
2313                         copy_size = roundup(copy_size, 8);
2314                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2315                 if (!copy_path)
2316                         return -ENOMEM;
2317                 memcpy((char *)copy_path, (const char *)path,
2318                        uni_path_len);
2319                 uni_path_len = copy_size;
2320                 path = copy_path;
2321         }
2322
2323         iov[1].iov_len = uni_path_len;
2324         iov[1].iov_base = path;
2325
2326         if (!server->oplocks)
2327                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2328
2329         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2330             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2331                 req->RequestedOplockLevel = *oplock;
2332         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2333                   (oparms->create_options & CREATE_NOT_FILE))
2334                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2335         else {
2336                 rc = add_lease_context(server, iov, &n_iov,
2337                                        oparms->fid->lease_key, oplock);
2338                 if (rc)
2339                         return rc;
2340         }
2341
2342         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2343                 /* need to set Next field of lease context if we request it */
2344                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2345                         struct create_context *ccontext =
2346                             (struct create_context *)iov[n_iov-1].iov_base;
2347                         ccontext->Next =
2348                                 cpu_to_le32(server->vals->create_lease_size);
2349                 }
2350
2351                 rc = add_durable_context(iov, &n_iov, oparms,
2352                                         tcon->use_persistent);
2353                 if (rc)
2354                         return rc;
2355         }
2356
2357         if (tcon->posix_extensions) {
2358                 if (n_iov > 2) {
2359                         struct create_context *ccontext =
2360                             (struct create_context *)iov[n_iov-1].iov_base;
2361                         ccontext->Next =
2362                                 cpu_to_le32(iov[n_iov-1].iov_len);
2363                 }
2364
2365                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2366                 if (rc)
2367                         return rc;
2368         }
2369
2370         if (tcon->snapshot_time) {
2371                 cifs_dbg(FYI, "adding snapshot context\n");
2372                 if (n_iov > 2) {
2373                         struct create_context *ccontext =
2374                             (struct create_context *)iov[n_iov-1].iov_base;
2375                         ccontext->Next =
2376                                 cpu_to_le32(iov[n_iov-1].iov_len);
2377                 }
2378
2379                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2380                 if (rc)
2381                         return rc;
2382         }
2383
2384
2385         rqst->rq_nvec = n_iov;
2386         return 0;
2387 }
2388
2389 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2390  * All other vectors are freed by kfree().
2391  */
2392 void
2393 SMB2_open_free(struct smb_rqst *rqst)
2394 {
2395         int i;
2396
2397         if (rqst && rqst->rq_iov) {
2398                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2399                 for (i = 1; i < rqst->rq_nvec; i++)
2400                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2401                                 kfree(rqst->rq_iov[i].iov_base);
2402         }
2403 }
2404
2405 int
2406 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2407           __u8 *oplock, struct smb2_file_all_info *buf,
2408           struct kvec *err_iov, int *buftype)
2409 {
2410         struct smb_rqst rqst;
2411         struct smb2_create_rsp *rsp = NULL;
2412         struct TCP_Server_Info *server;
2413         struct cifs_tcon *tcon = oparms->tcon;
2414         struct cifs_ses *ses = tcon->ses;
2415         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2416         struct kvec rsp_iov = {NULL, 0};
2417         int resp_buftype = CIFS_NO_BUFFER;
2418         int rc = 0;
2419         int flags = 0;
2420
2421         cifs_dbg(FYI, "create/open\n");
2422         if (ses && (ses->server))
2423                 server = ses->server;
2424         else
2425                 return -EIO;
2426
2427         if (smb3_encryption_required(tcon))
2428                 flags |= CIFS_TRANSFORM_REQ;
2429
2430         memset(&rqst, 0, sizeof(struct smb_rqst));
2431         memset(&iov, 0, sizeof(iov));
2432         rqst.rq_iov = iov;
2433         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2434
2435         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2436         if (rc)
2437                 goto creat_exit;
2438
2439         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2440                 oparms->create_options, oparms->desired_access);
2441
2442         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2443                             &rsp_iov);
2444         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2445
2446         if (rc != 0) {
2447                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2448                 if (err_iov && rsp) {
2449                         *err_iov = rsp_iov;
2450                         *buftype = resp_buftype;
2451                         resp_buftype = CIFS_NO_BUFFER;
2452                         rsp = NULL;
2453                 }
2454                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2455                                     oparms->create_options, oparms->desired_access, rc);
2456                 goto creat_exit;
2457         } else
2458                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2459                                      ses->Suid, oparms->create_options,
2460                                      oparms->desired_access);
2461
2462         atomic_inc(&tcon->num_remote_opens);
2463         oparms->fid->persistent_fid = rsp->PersistentFileId;
2464         oparms->fid->volatile_fid = rsp->VolatileFileId;
2465 #ifdef CONFIG_CIFS_DEBUG2
2466         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2467 #endif /* CIFS_DEBUG2 */
2468
2469         if (buf) {
2470                 memcpy(buf, &rsp->CreationTime, 32);
2471                 buf->AllocationSize = rsp->AllocationSize;
2472                 buf->EndOfFile = rsp->EndofFile;
2473                 buf->Attributes = rsp->FileAttributes;
2474                 buf->NumberOfLinks = cpu_to_le32(1);
2475                 buf->DeletePending = 0;
2476         }
2477
2478         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
2479                 *oplock = smb2_parse_lease_state(server, rsp,
2480                                                  &oparms->fid->epoch,
2481                                                  oparms->fid->lease_key);
2482         else
2483                 *oplock = rsp->OplockLevel;
2484 creat_exit:
2485         SMB2_open_free(&rqst);
2486         free_rsp_buf(resp_buftype, rsp);
2487         return rc;
2488 }
2489
2490 int
2491 SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2492                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2493                 bool is_fsctl, char *in_data, u32 indatalen,
2494                 __u32 max_response_size)
2495 {
2496         struct smb2_ioctl_req *req;
2497         struct kvec *iov = rqst->rq_iov;
2498         unsigned int total_len;
2499         int rc;
2500
2501         rc = smb2_plain_req_init(SMB2_IOCTL, tcon, (void **) &req, &total_len);
2502         if (rc)
2503                 return rc;
2504
2505         req->CtlCode = cpu_to_le32(opcode);
2506         req->PersistentFileId = persistent_fid;
2507         req->VolatileFileId = volatile_fid;
2508
2509         iov[0].iov_base = (char *)req;
2510         /*
2511          * If no input data, the size of ioctl struct in
2512          * protocol spec still includes a 1 byte data buffer,
2513          * but if input data passed to ioctl, we do not
2514          * want to double count this, so we do not send
2515          * the dummy one byte of data in iovec[0] if sending
2516          * input data (in iovec[1]).
2517          */
2518         if (indatalen) {
2519                 req->InputCount = cpu_to_le32(indatalen);
2520                 /* do not set InputOffset if no input data */
2521                 req->InputOffset =
2522                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2523                 rqst->rq_nvec = 2;
2524                 iov[0].iov_len = total_len - 1;
2525                 iov[1].iov_base = in_data;
2526                 iov[1].iov_len = indatalen;
2527         } else {
2528                 rqst->rq_nvec = 1;
2529                 iov[0].iov_len = total_len;
2530         }
2531
2532         req->OutputOffset = 0;
2533         req->OutputCount = 0; /* MBZ */
2534
2535         /*
2536          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
2537          * We Could increase default MaxOutputResponse, but that could require
2538          * more credits. Windows typically sets this smaller, but for some
2539          * ioctls it may be useful to allow server to send more. No point
2540          * limiting what the server can send as long as fits in one credit
2541          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
2542          * to increase this limit up in the future.
2543          * Note that for snapshot queries that servers like Azure expect that
2544          * the first query be minimal size (and just used to get the number/size
2545          * of previous versions) so response size must be specified as EXACTLY
2546          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2547          * of eight bytes.  Currently that is the only case where we set max
2548          * response size smaller.
2549          */
2550         req->MaxOutputResponse = cpu_to_le32(max_response_size);
2551
2552         if (is_fsctl)
2553                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2554         else
2555                 req->Flags = 0;
2556
2557         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2558         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2559                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2560
2561         return 0;
2562 }
2563
2564 void
2565 SMB2_ioctl_free(struct smb_rqst *rqst)
2566 {
2567         if (rqst && rqst->rq_iov)
2568                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2569 }
2570
2571
2572 /*
2573  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2574  */
2575 int
2576 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2577            u64 volatile_fid, u32 opcode, bool is_fsctl,
2578            char *in_data, u32 indatalen, u32 max_out_data_len,
2579            char **out_data, u32 *plen /* returned data len */)
2580 {
2581         struct smb_rqst rqst;
2582         struct smb2_ioctl_rsp *rsp = NULL;
2583         struct cifs_ses *ses;
2584         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
2585         struct kvec rsp_iov = {NULL, 0};
2586         int resp_buftype = CIFS_NO_BUFFER;
2587         int rc = 0;
2588         int flags = 0;
2589
2590         cifs_dbg(FYI, "SMB2 IOCTL\n");
2591
2592         if (out_data != NULL)
2593                 *out_data = NULL;
2594
2595         /* zero out returned data len, in case of error */
2596         if (plen)
2597                 *plen = 0;
2598
2599         if (tcon)
2600                 ses = tcon->ses;
2601         else
2602                 return -EIO;
2603
2604         if (!ses || !(ses->server))
2605                 return -EIO;
2606
2607         if (smb3_encryption_required(tcon))
2608                 flags |= CIFS_TRANSFORM_REQ;
2609
2610         memset(&rqst, 0, sizeof(struct smb_rqst));
2611         memset(&iov, 0, sizeof(iov));
2612         rqst.rq_iov = iov;
2613         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
2614
2615         rc = SMB2_ioctl_init(tcon, &rqst, persistent_fid, volatile_fid, opcode,
2616                              is_fsctl, in_data, indatalen, max_out_data_len);
2617         if (rc)
2618                 goto ioctl_exit;
2619
2620         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2621                             &rsp_iov);
2622         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2623
2624         if (rc != 0)
2625                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2626                                 ses->Suid, 0, opcode, rc);
2627
2628         if ((rc != 0) && (rc != -EINVAL)) {
2629                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2630                 goto ioctl_exit;
2631         } else if (rc == -EINVAL) {
2632                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2633                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2634                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2635                         goto ioctl_exit;
2636                 }
2637         }
2638
2639         /* check if caller wants to look at return data or just return rc */
2640         if ((plen == NULL) || (out_data == NULL))
2641                 goto ioctl_exit;
2642
2643         *plen = le32_to_cpu(rsp->OutputCount);
2644
2645         /* We check for obvious errors in the output buffer length and offset */
2646         if (*plen == 0)
2647                 goto ioctl_exit; /* server returned no data */
2648         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
2649                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2650                 *plen = 0;
2651                 rc = -EIO;
2652                 goto ioctl_exit;
2653         }
2654
2655         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
2656                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2657                         le32_to_cpu(rsp->OutputOffset));
2658                 *plen = 0;
2659                 rc = -EIO;
2660                 goto ioctl_exit;
2661         }
2662
2663         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
2664                             *plen, GFP_KERNEL);
2665         if (*out_data == NULL) {
2666                 rc = -ENOMEM;
2667                 goto ioctl_exit;
2668         }
2669
2670 ioctl_exit:
2671         SMB2_ioctl_free(&rqst);
2672         free_rsp_buf(resp_buftype, rsp);
2673         return rc;
2674 }
2675
2676 /*
2677  *   Individual callers to ioctl worker function follow
2678  */
2679
2680 int
2681 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2682                      u64 persistent_fid, u64 volatile_fid)
2683 {
2684         int rc;
2685         struct  compress_ioctl fsctl_input;
2686         char *ret_data = NULL;
2687
2688         fsctl_input.CompressionState =
2689                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2690
2691         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2692                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2693                         (char *)&fsctl_input /* data input */,
2694                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
2695                         &ret_data /* out data */, NULL);
2696
2697         cifs_dbg(FYI, "set compression rc %d\n", rc);
2698
2699         return rc;
2700 }
2701
2702 int
2703 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2704                 u64 persistent_fid, u64 volatile_fid)
2705 {
2706         struct smb2_close_req *req;
2707         struct kvec *iov = rqst->rq_iov;
2708         unsigned int total_len;
2709         int rc;
2710
2711         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2712         if (rc)
2713                 return rc;
2714
2715         req->PersistentFileId = persistent_fid;
2716         req->VolatileFileId = volatile_fid;
2717         iov[0].iov_base = (char *)req;
2718         iov[0].iov_len = total_len;
2719
2720         return 0;
2721 }
2722
2723 void
2724 SMB2_close_free(struct smb_rqst *rqst)
2725 {
2726         if (rqst && rqst->rq_iov)
2727                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2728 }
2729
2730 int
2731 SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2732                  u64 persistent_fid, u64 volatile_fid, int flags)
2733 {
2734         struct smb_rqst rqst;
2735         struct smb2_close_rsp *rsp = NULL;
2736         struct cifs_ses *ses = tcon->ses;
2737         struct kvec iov[1];
2738         struct kvec rsp_iov;
2739         int resp_buftype = CIFS_NO_BUFFER;
2740         int rc = 0;
2741
2742         cifs_dbg(FYI, "Close\n");
2743
2744         if (!ses || !(ses->server))
2745                 return -EIO;
2746
2747         if (smb3_encryption_required(tcon))
2748                 flags |= CIFS_TRANSFORM_REQ;
2749
2750         memset(&rqst, 0, sizeof(struct smb_rqst));
2751         memset(&iov, 0, sizeof(iov));
2752         rqst.rq_iov = iov;
2753         rqst.rq_nvec = 1;
2754
2755         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
2756         if (rc)
2757                 goto close_exit;
2758
2759         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2760         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2761
2762         if (rc != 0) {
2763                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2764                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2765                                      rc);
2766                 goto close_exit;
2767         }
2768
2769         atomic_dec(&tcon->num_remote_opens);
2770
2771         /* BB FIXME - decode close response, update inode for caching */
2772
2773 close_exit:
2774         SMB2_close_free(&rqst);
2775         free_rsp_buf(resp_buftype, rsp);
2776         return rc;
2777 }
2778
2779 int
2780 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2781            u64 persistent_fid, u64 volatile_fid)
2782 {
2783         return SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2784 }
2785
2786 int
2787 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
2788                   struct kvec *iov, unsigned int min_buf_size)
2789 {
2790         unsigned int smb_len = iov->iov_len;
2791         char *end_of_smb = smb_len + (char *)iov->iov_base;
2792         char *begin_of_buf = offset + (char *)iov->iov_base;
2793         char *end_of_buf = begin_of_buf + buffer_length;
2794
2795
2796         if (buffer_length < min_buf_size) {
2797                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2798                          buffer_length, min_buf_size);
2799                 return -EINVAL;
2800         }
2801
2802         /* check if beyond RFC1001 maximum length */
2803         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2804                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2805                          buffer_length, smb_len);
2806                 return -EINVAL;
2807         }
2808
2809         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2810                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2811                 return -EINVAL;
2812         }
2813
2814         return 0;
2815 }
2816
2817 /*
2818  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2819  * Caller must free buffer.
2820  */
2821 int
2822 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
2823                            struct kvec *iov, unsigned int minbufsize,
2824                            char *data)
2825 {
2826         char *begin_of_buf = offset + (char *)iov->iov_base;
2827         int rc;
2828
2829         if (!data)
2830                 return -EINVAL;
2831
2832         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
2833         if (rc)
2834                 return rc;
2835
2836         memcpy(data, begin_of_buf, buffer_length);
2837
2838         return 0;
2839 }
2840
2841 int
2842 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2843                      u64 persistent_fid, u64 volatile_fid,
2844                      u8 info_class, u8 info_type, u32 additional_info,
2845                      size_t output_len, size_t input_len, void *input)
2846 {
2847         struct smb2_query_info_req *req;
2848         struct kvec *iov = rqst->rq_iov;
2849         unsigned int total_len;
2850         int rc;
2851
2852         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2853                              &total_len);
2854         if (rc)
2855                 return rc;
2856
2857         req->InfoType = info_type;
2858         req->FileInfoClass = info_class;
2859         req->PersistentFileId = persistent_fid;
2860         req->VolatileFileId = volatile_fid;
2861         req->AdditionalInformation = cpu_to_le32(additional_info);
2862
2863         req->OutputBufferLength = cpu_to_le32(output_len);
2864         if (input_len) {
2865                 req->InputBufferLength = cpu_to_le32(input_len);
2866                 /* total_len for smb query request never close to le16 max */
2867                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
2868                 memcpy(req->Buffer, input, input_len);
2869         }
2870
2871         iov[0].iov_base = (char *)req;
2872         /* 1 for Buffer */
2873         iov[0].iov_len = total_len - 1 + input_len;
2874         return 0;
2875 }
2876
2877 void
2878 SMB2_query_info_free(struct smb_rqst *rqst)
2879 {
2880         if (rqst && rqst->rq_iov)
2881                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2882 }
2883
2884 static int
2885 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2886            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2887            u32 additional_info, size_t output_len, size_t min_len, void **data,
2888                 u32 *dlen)
2889 {
2890         struct smb_rqst rqst;
2891         struct smb2_query_info_rsp *rsp = NULL;
2892         struct kvec iov[1];
2893         struct kvec rsp_iov;
2894         int rc = 0;
2895         int resp_buftype = CIFS_NO_BUFFER;
2896         struct cifs_ses *ses = tcon->ses;
2897         int flags = 0;
2898         bool allocated = false;
2899
2900         cifs_dbg(FYI, "Query Info\n");
2901
2902         if (!ses || !(ses->server))
2903                 return -EIO;
2904
2905         if (smb3_encryption_required(tcon))
2906                 flags |= CIFS_TRANSFORM_REQ;
2907
2908         memset(&rqst, 0, sizeof(struct smb_rqst));
2909         memset(&iov, 0, sizeof(iov));
2910         rqst.rq_iov = iov;
2911         rqst.rq_nvec = 1;
2912
2913         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
2914                                   info_class, info_type, additional_info,
2915                                   output_len, 0, NULL);
2916         if (rc)
2917                 goto qinf_exit;
2918
2919         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
2920                                     ses->Suid, info_class, (__u32)info_type);
2921
2922         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2923         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2924
2925         if (rc) {
2926                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2927                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
2928                                 ses->Suid, info_class, (__u32)info_type, rc);
2929                 goto qinf_exit;
2930         }
2931
2932         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
2933                                 ses->Suid, info_class, (__u32)info_type);
2934
2935         if (dlen) {
2936                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2937                 if (!*data) {
2938                         *data = kmalloc(*dlen, GFP_KERNEL);
2939                         if (!*data) {
2940                                 cifs_dbg(VFS,
2941                                         "Error %d allocating memory for acl\n",
2942                                         rc);
2943                                 *dlen = 0;
2944                                 rc = -ENOMEM;
2945                                 goto qinf_exit;
2946                         }
2947                         allocated = true;
2948                 }
2949         }
2950
2951         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
2952                                         le32_to_cpu(rsp->OutputBufferLength),
2953                                         &rsp_iov, min_len, *data);
2954         if (rc && allocated) {
2955                 kfree(*data);
2956                 *data = NULL;
2957                 *dlen = 0;
2958         }
2959
2960 qinf_exit:
2961         SMB2_query_info_free(&rqst);
2962         free_rsp_buf(resp_buftype, rsp);
2963         return rc;
2964 }
2965
2966 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2967         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2968 {
2969         return query_info(xid, tcon, persistent_fid, volatile_fid,
2970                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2971                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2972                           sizeof(struct smb2_file_all_info), (void **)&data,
2973                           NULL);
2974 }
2975
2976 int
2977 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2978                 u64 persistent_fid, u64 volatile_fid,
2979                 void **data, u32 *plen)
2980 {
2981         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2982         *plen = 0;
2983
2984         return query_info(xid, tcon, persistent_fid, volatile_fid,
2985                           0, SMB2_O_INFO_SECURITY, additional_info,
2986                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
2987 }
2988
2989 int
2990 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2991                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2992 {
2993         return query_info(xid, tcon, persistent_fid, volatile_fid,
2994                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2995                           sizeof(struct smb2_file_internal_info),
2996                           sizeof(struct smb2_file_internal_info),
2997                           (void **)&uniqueid, NULL);
2998 }
2999
3000 /*
3001  * This is a no-op for now. We're not really interested in the reply, but
3002  * rather in the fact that the server sent one and that server->lstrp
3003  * gets updated.
3004  *
3005  * FIXME: maybe we should consider checking that the reply matches request?
3006  */
3007 static void
3008 smb2_echo_callback(struct mid_q_entry *mid)
3009 {
3010         struct TCP_Server_Info *server = mid->callback_data;
3011         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3012         struct cifs_credits credits = { .value = 0, .instance = 0 };
3013
3014         if (mid->mid_state == MID_RESPONSE_RECEIVED
3015             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3016                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3017                 credits.instance = server->reconnect_instance;
3018         }
3019
3020         DeleteMidQEntry(mid);
3021         add_credits(server, &credits, CIFS_ECHO_OP);
3022 }
3023
3024 void smb2_reconnect_server(struct work_struct *work)
3025 {
3026         struct TCP_Server_Info *server = container_of(work,
3027                                         struct TCP_Server_Info, reconnect.work);
3028         struct cifs_ses *ses;
3029         struct cifs_tcon *tcon, *tcon2;
3030         struct list_head tmp_list;
3031         int tcon_exist = false;
3032         int rc;
3033         int resched = false;
3034
3035
3036         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3037         mutex_lock(&server->reconnect_mutex);
3038
3039         INIT_LIST_HEAD(&tmp_list);
3040         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3041
3042         spin_lock(&cifs_tcp_ses_lock);
3043         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3044                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3045                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3046                                 tcon->tc_count++;
3047                                 list_add_tail(&tcon->rlist, &tmp_list);
3048                                 tcon_exist = true;
3049                         }
3050                 }
3051                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3052                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3053                         tcon_exist = true;
3054                 }
3055         }
3056         /*
3057          * Get the reference to server struct to be sure that the last call of
3058          * cifs_put_tcon() in the loop below won't release the server pointer.
3059          */
3060         if (tcon_exist)
3061                 server->srv_count++;
3062
3063         spin_unlock(&cifs_tcp_ses_lock);
3064
3065         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3066                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
3067                 if (!rc)
3068                         cifs_reopen_persistent_handles(tcon);
3069                 else
3070                         resched = true;
3071                 list_del_init(&tcon->rlist);
3072                 cifs_put_tcon(tcon);
3073         }
3074
3075         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3076         if (resched)
3077                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3078         mutex_unlock(&server->reconnect_mutex);
3079
3080         /* now we can safely release srv struct */
3081         if (tcon_exist)
3082                 cifs_put_tcp_session(server, 1);
3083 }
3084
3085 int
3086 SMB2_echo(struct TCP_Server_Info *server)
3087 {
3088         struct smb2_echo_req *req;
3089         int rc = 0;
3090         struct kvec iov[1];
3091         struct smb_rqst rqst = { .rq_iov = iov,
3092                                  .rq_nvec = 1 };
3093         unsigned int total_len;
3094
3095         cifs_dbg(FYI, "In echo request\n");
3096
3097         if (server->tcpStatus == CifsNeedNegotiate) {
3098                 /* No need to send echo on newly established connections */
3099                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
3100                 return rc;
3101         }
3102
3103         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
3104         if (rc)
3105                 return rc;
3106
3107         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3108
3109         iov[0].iov_len = total_len;
3110         iov[0].iov_base = (char *)req;
3111
3112         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3113                              server, CIFS_ECHO_OP, NULL);
3114         if (rc)
3115                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3116
3117         cifs_small_buf_release(req);
3118         return rc;
3119 }
3120
3121 int
3122 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3123            u64 volatile_fid)
3124 {
3125         struct smb_rqst rqst;
3126         struct smb2_flush_req *req;
3127         struct cifs_ses *ses = tcon->ses;
3128         struct kvec iov[1];
3129         struct kvec rsp_iov;
3130         int resp_buftype;
3131         int rc = 0;
3132         int flags = 0;
3133         unsigned int total_len;
3134
3135         cifs_dbg(FYI, "Flush\n");
3136
3137         if (!ses || !(ses->server))
3138                 return -EIO;
3139
3140         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
3141         if (rc)
3142                 return rc;
3143
3144         if (smb3_encryption_required(tcon))
3145                 flags |= CIFS_TRANSFORM_REQ;
3146
3147         req->PersistentFileId = persistent_fid;
3148         req->VolatileFileId = volatile_fid;
3149
3150         iov[0].iov_base = (char *)req;
3151         iov[0].iov_len = total_len;
3152
3153         memset(&rqst, 0, sizeof(struct smb_rqst));
3154         rqst.rq_iov = iov;
3155         rqst.rq_nvec = 1;
3156
3157         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3158         cifs_small_buf_release(req);
3159
3160         if (rc != 0) {
3161                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3162                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3163                                      rc);
3164         }
3165
3166         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3167         return rc;
3168 }
3169
3170 /*
3171  * To form a chain of read requests, any read requests after the first should
3172  * have the end_of_chain boolean set to true.
3173  */
3174 static int
3175 smb2_new_read_req(void **buf, unsigned int *total_len,
3176         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3177         unsigned int remaining_bytes, int request_type)
3178 {
3179         int rc = -EACCES;
3180         struct smb2_read_plain_req *req = NULL;
3181         struct smb2_sync_hdr *shdr;
3182         struct TCP_Server_Info *server;
3183
3184         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
3185                                  total_len);
3186         if (rc)
3187                 return rc;
3188
3189         server = io_parms->tcon->ses->server;
3190         if (server == NULL)
3191                 return -ECONNABORTED;
3192
3193         shdr = &req->sync_hdr;
3194         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3195
3196         req->PersistentFileId = io_parms->persistent_fid;
3197         req->VolatileFileId = io_parms->volatile_fid;
3198         req->ReadChannelInfoOffset = 0; /* reserved */
3199         req->ReadChannelInfoLength = 0; /* reserved */
3200         req->Channel = 0; /* reserved */
3201         req->MinimumCount = 0;
3202         req->Length = cpu_to_le32(io_parms->length);
3203         req->Offset = cpu_to_le64(io_parms->offset);
3204
3205         trace_smb3_read_enter(0 /* xid */,
3206                         io_parms->persistent_fid,
3207                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3208                         io_parms->offset, io_parms->length);
3209 #ifdef CONFIG_CIFS_SMB_DIRECT
3210         /*
3211          * If we want to do a RDMA write, fill in and append
3212          * smbd_buffer_descriptor_v1 to the end of read request
3213          */
3214         if (server->rdma && rdata && !server->sign &&
3215                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3216
3217                 struct smbd_buffer_descriptor_v1 *v1;
3218                 bool need_invalidate =
3219                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3220
3221                 rdata->mr = smbd_register_mr(
3222                                 server->smbd_conn, rdata->pages,
3223                                 rdata->nr_pages, rdata->page_offset,
3224                                 rdata->tailsz, true, need_invalidate);
3225                 if (!rdata->mr)
3226                         return -ENOBUFS;
3227
3228                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3229                 if (need_invalidate)
3230                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3231                 req->ReadChannelInfoOffset =
3232                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3233                 req->ReadChannelInfoLength =
3234                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3235                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3236                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3237                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3238                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3239
3240                 *total_len += sizeof(*v1) - 1;
3241         }
3242 #endif
3243         if (request_type & CHAINED_REQUEST) {
3244                 if (!(request_type & END_OF_CHAIN)) {
3245                         /* next 8-byte aligned request */
3246                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3247                         shdr->NextCommand = cpu_to_le32(*total_len);
3248                 } else /* END_OF_CHAIN */
3249                         shdr->NextCommand = 0;
3250                 if (request_type & RELATED_REQUEST) {
3251                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3252                         /*
3253                          * Related requests use info from previous read request
3254                          * in chain.
3255                          */
3256                         shdr->SessionId = 0xFFFFFFFF;
3257                         shdr->TreeId = 0xFFFFFFFF;
3258                         req->PersistentFileId = 0xFFFFFFFF;
3259                         req->VolatileFileId = 0xFFFFFFFF;
3260                 }
3261         }
3262         if (remaining_bytes > io_parms->length)
3263                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3264         else
3265                 req->RemainingBytes = 0;
3266
3267         *buf = req;
3268         return rc;
3269 }
3270
3271 static void
3272 smb2_readv_callback(struct mid_q_entry *mid)
3273 {
3274         struct cifs_readdata *rdata = mid->callback_data;
3275         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3276         struct TCP_Server_Info *server = tcon->ses->server;
3277         struct smb2_sync_hdr *shdr =
3278                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3279         struct cifs_credits credits = { .value = 0, .instance = 0 };
3280         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3281                                  .rq_nvec = 2,
3282                                  .rq_pages = rdata->pages,
3283                                  .rq_offset = rdata->page_offset,
3284                                  .rq_npages = rdata->nr_pages,
3285                                  .rq_pagesz = rdata->pagesz,
3286                                  .rq_tailsz = rdata->tailsz };
3287
3288         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3289                  __func__, mid->mid, mid->mid_state, rdata->result,
3290                  rdata->bytes);
3291
3292         switch (mid->mid_state) {
3293         case MID_RESPONSE_RECEIVED:
3294                 credits.value = le16_to_cpu(shdr->CreditRequest);
3295                 credits.instance = server->reconnect_instance;
3296                 /* result already set, check signature */
3297                 if (server->sign && !mid->decrypted) {
3298                         int rc;
3299
3300                         rc = smb2_verify_signature(&rqst, server);
3301                         if (rc)
3302                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
3303                                          rc);
3304                 }
3305                 /* FIXME: should this be counted toward the initiating task? */
3306                 task_io_account_read(rdata->got_bytes);
3307                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3308                 break;
3309         case MID_REQUEST_SUBMITTED:
3310         case MID_RETRY_NEEDED:
3311                 rdata->result = -EAGAIN;
3312                 if (server->sign && rdata->got_bytes)
3313                         /* reset bytes number since we can not check a sign */
3314                         rdata->got_bytes = 0;
3315                 /* FIXME: should this be counted toward the initiating task? */
3316                 task_io_account_read(rdata->got_bytes);
3317                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3318                 break;
3319         case MID_RESPONSE_MALFORMED:
3320                 credits.value = le16_to_cpu(shdr->CreditRequest);
3321                 credits.instance = server->reconnect_instance;
3322                 /* fall through */
3323         default:
3324                 rdata->result = -EIO;
3325         }
3326 #ifdef CONFIG_CIFS_SMB_DIRECT
3327         /*
3328          * If this rdata has a memmory registered, the MR can be freed
3329          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3330          * because they have limited number and are used for future I/Os
3331          */
3332         if (rdata->mr) {
3333                 smbd_deregister_mr(rdata->mr);
3334                 rdata->mr = NULL;
3335         }
3336 #endif
3337         if (rdata->result && rdata->result != -ENODATA) {
3338                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3339                 trace_smb3_read_err(0 /* xid */,
3340                                     rdata->cfile->fid.persistent_fid,
3341                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3342                                     rdata->bytes, rdata->result);
3343         } else
3344                 trace_smb3_read_done(0 /* xid */,
3345                                      rdata->cfile->fid.persistent_fid,
3346                                      tcon->tid, tcon->ses->Suid,
3347                                      rdata->offset, rdata->got_bytes);
3348
3349         queue_work(cifsiod_wq, &rdata->work);
3350         DeleteMidQEntry(mid);
3351         add_credits(server, &credits, 0);
3352 }
3353
3354 /* smb2_async_readv - send an async read, and set up mid to handle result */
3355 int
3356 smb2_async_readv(struct cifs_readdata *rdata)
3357 {
3358         int rc, flags = 0;
3359         char *buf;
3360         struct smb2_sync_hdr *shdr;
3361         struct cifs_io_parms io_parms;
3362         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3363                                  .rq_nvec = 1 };
3364         struct TCP_Server_Info *server;
3365         unsigned int total_len;
3366
3367         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3368                  __func__, rdata->offset, rdata->bytes);
3369
3370         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3371         io_parms.offset = rdata->offset;
3372         io_parms.length = rdata->bytes;
3373         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3374         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3375         io_parms.pid = rdata->pid;
3376
3377         server = io_parms.tcon->ses->server;
3378
3379         rc = smb2_new_read_req(
3380                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3381         if (rc)
3382                 return rc;
3383
3384         if (smb3_encryption_required(io_parms.tcon))
3385                 flags |= CIFS_TRANSFORM_REQ;
3386
3387         rdata->iov[0].iov_base = buf;
3388         rdata->iov[0].iov_len = total_len;
3389
3390         shdr = (struct smb2_sync_hdr *)buf;
3391
3392         if (rdata->credits.value > 0) {
3393                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3394                                                 SMB2_MAX_BUFFER_SIZE));
3395                 shdr->CreditRequest =
3396                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3397
3398                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
3399                 if (rc)
3400                         goto async_readv_out;
3401
3402                 flags |= CIFS_HAS_CREDITS;
3403         }
3404
3405         kref_get(&rdata->refcount);
3406         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3407                              cifs_readv_receive, smb2_readv_callback,
3408                              smb3_handle_read_data, rdata, flags,
3409                              &rdata->credits);
3410         if (rc) {
3411                 kref_put(&rdata->refcount, cifs_readdata_release);
3412                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3413                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
3414                                     io_parms.tcon->tid,
3415                                     io_parms.tcon->ses->Suid,
3416                                     io_parms.offset, io_parms.length, rc);
3417         }
3418
3419 async_readv_out:
3420         cifs_small_buf_release(buf);
3421         return rc;
3422 }
3423
3424 int
3425 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3426           unsigned int *nbytes, char **buf, int *buf_type)
3427 {
3428         struct smb_rqst rqst;
3429         int resp_buftype, rc = -EACCES;
3430         struct smb2_read_plain_req *req = NULL;
3431         struct smb2_read_rsp *rsp = NULL;
3432         struct kvec iov[1];
3433         struct kvec rsp_iov;
3434         unsigned int total_len;
3435         int flags = CIFS_LOG_ERROR;
3436         struct cifs_ses *ses = io_parms->tcon->ses;
3437
3438         *nbytes = 0;
3439         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3440         if (rc)
3441                 return rc;
3442
3443         if (smb3_encryption_required(io_parms->tcon))
3444                 flags |= CIFS_TRANSFORM_REQ;
3445
3446         iov[0].iov_base = (char *)req;
3447         iov[0].iov_len = total_len;
3448
3449         memset(&rqst, 0, sizeof(struct smb_rqst));
3450         rqst.rq_iov = iov;
3451         rqst.rq_nvec = 1;
3452
3453         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3454         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3455
3456         if (rc) {
3457                 if (rc != -ENODATA) {
3458                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3459                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3460                         trace_smb3_read_err(xid, req->PersistentFileId,
3461                                             io_parms->tcon->tid, ses->Suid,
3462                                             io_parms->offset, io_parms->length,
3463                                             rc);
3464                 } else
3465                         trace_smb3_read_done(xid, req->PersistentFileId,
3466                                     io_parms->tcon->tid, ses->Suid,
3467                                     io_parms->offset, 0);
3468                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3469                 cifs_small_buf_release(req);
3470                 return rc == -ENODATA ? 0 : rc;
3471         } else
3472                 trace_smb3_read_done(xid, req->PersistentFileId,
3473                                     io_parms->tcon->tid, ses->Suid,
3474                                     io_parms->offset, io_parms->length);
3475
3476         cifs_small_buf_release(req);
3477
3478         *nbytes = le32_to_cpu(rsp->DataLength);
3479         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3480             (*nbytes > io_parms->length)) {
3481                 cifs_dbg(FYI, "bad length %d for count %d\n",
3482                          *nbytes, io_parms->length);
3483                 rc = -EIO;
3484                 *nbytes = 0;
3485         }
3486
3487         if (*buf) {
3488                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3489                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3490         } else if (resp_buftype != CIFS_NO_BUFFER) {
3491                 *buf = rsp_iov.iov_base;
3492                 if (resp_buftype == CIFS_SMALL_BUFFER)
3493                         *buf_type = CIFS_SMALL_BUFFER;
3494                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3495                         *buf_type = CIFS_LARGE_BUFFER;
3496         }
3497         return rc;
3498 }
3499
3500 /*
3501  * Check the mid_state and signature on received buffer (if any), and queue the
3502  * workqueue completion task.
3503  */
3504 static void
3505 smb2_writev_callback(struct mid_q_entry *mid)
3506 {
3507         struct cifs_writedata *wdata = mid->callback_data;
3508         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3509         struct TCP_Server_Info *server = tcon->ses->server;
3510         unsigned int written;
3511         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3512         struct cifs_credits credits = { .value = 0, .instance = 0 };
3513
3514         switch (mid->mid_state) {
3515         case MID_RESPONSE_RECEIVED:
3516                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3517                 credits.instance = server->reconnect_instance;
3518                 wdata->result = smb2_check_receive(mid, server, 0);
3519                 if (wdata->result != 0)
3520                         break;
3521
3522                 written = le32_to_cpu(rsp->DataLength);
3523                 /*
3524                  * Mask off high 16 bits when bytes written as returned
3525                  * by the server is greater than bytes requested by the
3526                  * client. OS/2 servers are known to set incorrect
3527                  * CountHigh values.
3528                  */
3529                 if (written > wdata->bytes)
3530                         written &= 0xFFFF;
3531
3532                 if (written < wdata->bytes)
3533                         wdata->result = -ENOSPC;
3534                 else
3535                         wdata->bytes = written;
3536                 break;
3537         case MID_REQUEST_SUBMITTED:
3538         case MID_RETRY_NEEDED:
3539                 wdata->result = -EAGAIN;
3540                 break;
3541         case MID_RESPONSE_MALFORMED:
3542                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3543                 credits.instance = server->reconnect_instance;
3544                 /* fall through */
3545         default:
3546                 wdata->result = -EIO;
3547                 break;
3548         }
3549 #ifdef CONFIG_CIFS_SMB_DIRECT
3550         /*
3551          * If this wdata has a memory registered, the MR can be freed
3552          * The number of MRs available is limited, it's important to recover
3553          * used MR as soon as I/O is finished. Hold MR longer in the later
3554          * I/O process can possibly result in I/O deadlock due to lack of MR
3555          * to send request on I/O retry
3556          */
3557         if (wdata->mr) {
3558                 smbd_deregister_mr(wdata->mr);
3559                 wdata->mr = NULL;
3560         }
3561 #endif
3562         if (wdata->result) {
3563                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3564                 trace_smb3_write_err(0 /* no xid */,
3565                                      wdata->cfile->fid.persistent_fid,
3566                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3567                                      wdata->bytes, wdata->result);
3568         } else
3569                 trace_smb3_write_done(0 /* no xid */,
3570                                       wdata->cfile->fid.persistent_fid,
3571                                       tcon->tid, tcon->ses->Suid,
3572                                       wdata->offset, wdata->bytes);
3573
3574         queue_work(cifsiod_wq, &wdata->work);
3575         DeleteMidQEntry(mid);
3576         add_credits(server, &credits, 0);
3577 }
3578
3579 /* smb2_async_writev - send an async write, and set up mid to handle result */
3580 int
3581 smb2_async_writev(struct cifs_writedata *wdata,
3582                   void (*release)(struct kref *kref))
3583 {
3584         int rc = -EACCES, flags = 0;
3585         struct smb2_write_req *req = NULL;
3586         struct smb2_sync_hdr *shdr;
3587         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3588         struct TCP_Server_Info *server = tcon->ses->server;
3589         struct kvec iov[1];
3590         struct smb_rqst rqst = { };
3591         unsigned int total_len;
3592
3593         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3594         if (rc)
3595                 return rc;
3596
3597         if (smb3_encryption_required(tcon))
3598                 flags |= CIFS_TRANSFORM_REQ;
3599
3600         shdr = (struct smb2_sync_hdr *)req;
3601         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3602
3603         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3604         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3605         req->WriteChannelInfoOffset = 0;
3606         req->WriteChannelInfoLength = 0;
3607         req->Channel = 0;
3608         req->Offset = cpu_to_le64(wdata->offset);
3609         req->DataOffset = cpu_to_le16(
3610                                 offsetof(struct smb2_write_req, Buffer));
3611         req->RemainingBytes = 0;
3612
3613         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
3614                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
3615 #ifdef CONFIG_CIFS_SMB_DIRECT
3616         /*
3617          * If we want to do a server RDMA read, fill in and append
3618          * smbd_buffer_descriptor_v1 to the end of write request
3619          */
3620         if (server->rdma && !server->sign && wdata->bytes >=
3621                 server->smbd_conn->rdma_readwrite_threshold) {
3622
3623                 struct smbd_buffer_descriptor_v1 *v1;
3624                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3625
3626                 wdata->mr = smbd_register_mr(
3627                                 server->smbd_conn, wdata->pages,
3628                                 wdata->nr_pages, wdata->page_offset,
3629                                 wdata->tailsz, false, need_invalidate);
3630                 if (!wdata->mr) {
3631                         rc = -ENOBUFS;
3632                         goto async_writev_out;
3633                 }
3634                 req->Length = 0;
3635                 req->DataOffset = 0;
3636                 if (wdata->nr_pages > 1)
3637                         req->RemainingBytes =
3638                                 cpu_to_le32(
3639                                         (wdata->nr_pages - 1) * wdata->pagesz -
3640                                         wdata->page_offset + wdata->tailsz
3641                                 );
3642                 else
3643                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3644                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3645                 if (need_invalidate)
3646                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3647                 req->WriteChannelInfoOffset =
3648                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3649                 req->WriteChannelInfoLength =
3650                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3651                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3652                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3653                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3654                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3655         }
3656 #endif
3657         iov[0].iov_len = total_len - 1;
3658         iov[0].iov_base = (char *)req;
3659
3660         rqst.rq_iov = iov;
3661         rqst.rq_nvec = 1;
3662         rqst.rq_pages = wdata->pages;
3663         rqst.rq_offset = wdata->page_offset;
3664         rqst.rq_npages = wdata->nr_pages;
3665         rqst.rq_pagesz = wdata->pagesz;
3666         rqst.rq_tailsz = wdata->tailsz;
3667 #ifdef CONFIG_CIFS_SMB_DIRECT
3668         if (wdata->mr) {
3669                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3670                 rqst.rq_npages = 0;
3671         }
3672 #endif
3673         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3674                  wdata->offset, wdata->bytes);
3675
3676 #ifdef CONFIG_CIFS_SMB_DIRECT
3677         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3678         if (!wdata->mr)
3679                 req->Length = cpu_to_le32(wdata->bytes);
3680 #else
3681         req->Length = cpu_to_le32(wdata->bytes);
3682 #endif
3683
3684         if (wdata->credits.value > 0) {
3685                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3686                                                     SMB2_MAX_BUFFER_SIZE));
3687                 shdr->CreditRequest =
3688                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3689
3690                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
3691                 if (rc)
3692                         goto async_writev_out;
3693
3694                 flags |= CIFS_HAS_CREDITS;
3695         }
3696
3697         kref_get(&wdata->refcount);
3698         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3699                              wdata, flags, &wdata->credits);
3700
3701         if (rc) {
3702                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
3703                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3704                                      wdata->bytes, rc);
3705                 kref_put(&wdata->refcount, release);
3706                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3707         }
3708
3709 async_writev_out:
3710         cifs_small_buf_release(req);
3711         return rc;
3712 }
3713
3714 /*
3715  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
3716  * The length field from io_parms must be at least 1 and indicates a number of
3717  * elements with data to write that begins with position 1 in iov array. All
3718  * data length is specified by count.
3719  */
3720 int
3721 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
3722            unsigned int *nbytes, struct kvec *iov, int n_vec)
3723 {
3724         struct smb_rqst rqst;
3725         int rc = 0;
3726         struct smb2_write_req *req = NULL;
3727         struct smb2_write_rsp *rsp = NULL;
3728         int resp_buftype;
3729         struct kvec rsp_iov;
3730         int flags = 0;
3731         unsigned int total_len;
3732
3733         *nbytes = 0;
3734
3735         if (n_vec < 1)
3736                 return rc;
3737
3738         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
3739                              &total_len);
3740         if (rc)
3741                 return rc;
3742
3743         if (io_parms->tcon->ses->server == NULL)
3744                 return -ECONNABORTED;
3745
3746         if (smb3_encryption_required(io_parms->tcon))
3747                 flags |= CIFS_TRANSFORM_REQ;
3748
3749         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3750
3751         req->PersistentFileId = io_parms->persistent_fid;
3752         req->VolatileFileId = io_parms->volatile_fid;
3753         req->WriteChannelInfoOffset = 0;
3754         req->WriteChannelInfoLength = 0;
3755         req->Channel = 0;
3756         req->Length = cpu_to_le32(io_parms->length);
3757         req->Offset = cpu_to_le64(io_parms->offset);
3758         req->DataOffset = cpu_to_le16(
3759                                 offsetof(struct smb2_write_req, Buffer));
3760         req->RemainingBytes = 0;
3761
3762         trace_smb3_write_enter(xid, io_parms->persistent_fid,
3763                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3764                 io_parms->offset, io_parms->length);
3765
3766         iov[0].iov_base = (char *)req;
3767         /* 1 for Buffer */
3768         iov[0].iov_len = total_len - 1;
3769
3770         memset(&rqst, 0, sizeof(struct smb_rqst));
3771         rqst.rq_iov = iov;
3772         rqst.rq_nvec = n_vec + 1;
3773
3774         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
3775                             &resp_buftype, flags, &rsp_iov);
3776         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3777
3778         if (rc) {
3779                 trace_smb3_write_err(xid, req->PersistentFileId,
3780                                      io_parms->tcon->tid,
3781                                      io_parms->tcon->ses->Suid,
3782                                      io_parms->offset, io_parms->length, rc);
3783                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3784                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
3785         } else {
3786                 *nbytes = le32_to_cpu(rsp->DataLength);
3787                 trace_smb3_write_done(xid, req->PersistentFileId,
3788                                      io_parms->tcon->tid,
3789                                      io_parms->tcon->ses->Suid,
3790                                      io_parms->offset, *nbytes);
3791         }
3792
3793         cifs_small_buf_release(req);
3794         free_rsp_buf(resp_buftype, rsp);
3795         return rc;
3796 }
3797
3798 static unsigned int
3799 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
3800 {
3801         int len;
3802         unsigned int entrycount = 0;
3803         unsigned int next_offset = 0;
3804         char *entryptr;
3805         FILE_DIRECTORY_INFO *dir_info;
3806
3807         if (bufstart == NULL)
3808                 return 0;
3809
3810         entryptr = bufstart;
3811
3812         while (1) {
3813                 if (entryptr + next_offset < entryptr ||
3814                     entryptr + next_offset > end_of_buf ||
3815                     entryptr + next_offset + size > end_of_buf) {
3816                         cifs_dbg(VFS, "malformed search entry would overflow\n");
3817                         break;
3818                 }
3819
3820                 entryptr = entryptr + next_offset;
3821                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
3822
3823                 len = le32_to_cpu(dir_info->FileNameLength);
3824                 if (entryptr + len < entryptr ||
3825                     entryptr + len > end_of_buf ||
3826                     entryptr + len + size > end_of_buf) {
3827                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
3828                                  end_of_buf);
3829                         break;
3830                 }
3831
3832                 *lastentry = entryptr;
3833                 entrycount++;
3834
3835                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
3836                 if (!next_offset)
3837                         break;
3838         }
3839
3840         return entrycount;
3841 }
3842
3843 /*
3844  * Readdir/FindFirst
3845  */
3846 int
3847 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
3848                      u64 persistent_fid, u64 volatile_fid, int index,
3849                      struct cifs_search_info *srch_inf)
3850 {
3851         struct smb_rqst rqst;
3852         struct smb2_query_directory_req *req;
3853         struct smb2_query_directory_rsp *rsp = NULL;
3854         struct kvec iov[2];
3855         struct kvec rsp_iov;
3856         int rc = 0;
3857         int len;
3858         int resp_buftype = CIFS_NO_BUFFER;
3859         unsigned char *bufptr;
3860         struct TCP_Server_Info *server;
3861         struct cifs_ses *ses = tcon->ses;
3862         __le16 asteriks = cpu_to_le16('*');
3863         char *end_of_smb;
3864         unsigned int output_size = CIFSMaxBufSize;
3865         size_t info_buf_size;
3866         int flags = 0;
3867         unsigned int total_len;
3868
3869         if (ses && (ses->server))
3870                 server = ses->server;
3871         else
3872                 return -EIO;
3873
3874         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
3875                              &total_len);
3876         if (rc)
3877                 return rc;
3878
3879         if (smb3_encryption_required(tcon))
3880                 flags |= CIFS_TRANSFORM_REQ;
3881
3882         switch (srch_inf->info_level) {
3883         case SMB_FIND_FILE_DIRECTORY_INFO:
3884                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3885                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3886                 break;
3887         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3888                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3889                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3890                 break;
3891         default:
3892                 cifs_dbg(VFS, "info level %u isn't supported\n",
3893                          srch_inf->info_level);
3894                 rc = -EINVAL;
3895                 goto qdir_exit;
3896         }
3897
3898         req->FileIndex = cpu_to_le32(index);
3899         req->PersistentFileId = persistent_fid;
3900         req->VolatileFileId = volatile_fid;
3901
3902         len = 0x2;
3903         bufptr = req->Buffer;
3904         memcpy(bufptr, &asteriks, len);
3905
3906         req->FileNameOffset =
3907                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3908         req->FileNameLength = cpu_to_le16(len);
3909         /*
3910          * BB could be 30 bytes or so longer if we used SMB2 specific
3911          * buffer lengths, but this is safe and close enough.
3912          */
3913         output_size = min_t(unsigned int, output_size, server->maxBuf);
3914         output_size = min_t(unsigned int, output_size, 2 << 15);
3915         req->OutputBufferLength = cpu_to_le32(output_size);
3916
3917         iov[0].iov_base = (char *)req;
3918         /* 1 for Buffer */
3919         iov[0].iov_len = total_len - 1;
3920
3921         iov[1].iov_base = (char *)(req->Buffer);
3922         iov[1].iov_len = len;
3923
3924         memset(&rqst, 0, sizeof(struct smb_rqst));
3925         rqst.rq_iov = iov;
3926         rqst.rq_nvec = 2;
3927
3928         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
3929                         tcon->ses->Suid, index, output_size);
3930
3931         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3932         cifs_small_buf_release(req);
3933         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3934
3935         if (rc) {
3936                 if (rc == -ENODATA &&
3937                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
3938                         trace_smb3_query_dir_done(xid, persistent_fid,
3939                                 tcon->tid, tcon->ses->Suid, index, 0);
3940                         srch_inf->endOfSearch = true;
3941                         rc = 0;
3942                 } else {
3943                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
3944                                 tcon->ses->Suid, index, 0, rc);
3945                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
3946                 }
3947                 goto qdir_exit;
3948         }
3949
3950         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
3951                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
3952                                info_buf_size);
3953         if (rc) {
3954                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
3955                         tcon->ses->Suid, index, 0, rc);
3956                 goto qdir_exit;
3957         }
3958
3959         srch_inf->unicode = true;
3960
3961         if (srch_inf->ntwrk_buf_start) {
3962                 if (srch_inf->smallBuf)
3963                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
3964                 else
3965                         cifs_buf_release(srch_inf->ntwrk_buf_start);
3966         }
3967         srch_inf->ntwrk_buf_start = (char *)rsp;
3968         srch_inf->srch_entries_start = srch_inf->last_entry =
3969                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
3970         end_of_smb = rsp_iov.iov_len + (char *)rsp;
3971         srch_inf->entries_in_buffer =
3972                         num_entries(srch_inf->srch_entries_start, end_of_smb,
3973                                     &srch_inf->last_entry, info_buf_size);
3974         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
3975         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
3976                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
3977                  srch_inf->srch_entries_start, srch_inf->last_entry);
3978         if (resp_buftype == CIFS_LARGE_BUFFER)
3979                 srch_inf->smallBuf = false;
3980         else if (resp_buftype == CIFS_SMALL_BUFFER)
3981                 srch_inf->smallBuf = true;
3982         else
3983                 cifs_dbg(VFS, "illegal search buffer type\n");
3984
3985         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
3986                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
3987         return rc;
3988
3989 qdir_exit:
3990         free_rsp_buf(resp_buftype, rsp);
3991         return rc;
3992 }
3993
3994 int
3995 SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
3996                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3997                u8 info_type, u32 additional_info,
3998                 void **data, unsigned int *size)
3999 {
4000         struct smb2_set_info_req *req;
4001         struct kvec *iov = rqst->rq_iov;
4002         unsigned int i, total_len;
4003         int rc;
4004
4005         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
4006         if (rc)
4007                 return rc;
4008
4009         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4010         req->InfoType = info_type;
4011         req->FileInfoClass = info_class;
4012         req->PersistentFileId = persistent_fid;
4013         req->VolatileFileId = volatile_fid;
4014         req->AdditionalInformation = cpu_to_le32(additional_info);
4015
4016         req->BufferOffset =
4017                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4018         req->BufferLength = cpu_to_le32(*size);
4019
4020         memcpy(req->Buffer, *data, *size);
4021         total_len += *size;
4022
4023         iov[0].iov_base = (char *)req;
4024         /* 1 for Buffer */
4025         iov[0].iov_len = total_len - 1;
4026
4027         for (i = 1; i < rqst->rq_nvec; i++) {
4028                 le32_add_cpu(&req->BufferLength, size[i]);
4029                 iov[i].iov_base = (char *)data[i];
4030                 iov[i].iov_len = size[i];
4031         }
4032
4033         return 0;
4034 }
4035
4036 void
4037 SMB2_set_info_free(struct smb_rqst *rqst)
4038 {
4039         if (rqst && rqst->rq_iov)
4040                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4041 }
4042
4043 static int
4044 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4045                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4046                u8 info_type, u32 additional_info, unsigned int num,
4047                 void **data, unsigned int *size)
4048 {
4049         struct smb_rqst rqst;
4050         struct smb2_set_info_rsp *rsp = NULL;
4051         struct kvec *iov;
4052         struct kvec rsp_iov;
4053         int rc = 0;
4054         int resp_buftype;
4055         struct cifs_ses *ses = tcon->ses;
4056         int flags = 0;
4057
4058         if (!ses || !(ses->server))
4059                 return -EIO;
4060
4061         if (!num)
4062                 return -EINVAL;
4063
4064         if (smb3_encryption_required(tcon))
4065                 flags |= CIFS_TRANSFORM_REQ;
4066
4067         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4068         if (!iov)
4069                 return -ENOMEM;
4070
4071         memset(&rqst, 0, sizeof(struct smb_rqst));
4072         rqst.rq_iov = iov;
4073         rqst.rq_nvec = num;
4074
4075         rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid,
4076                                 info_class, info_type, additional_info,
4077                                 data, size);
4078         if (rc) {
4079                 kfree(iov);
4080                 return rc;
4081         }
4082
4083
4084         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
4085                             &rsp_iov);
4086         SMB2_set_info_free(&rqst);
4087         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4088
4089         if (rc != 0) {
4090                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4091                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4092                                 ses->Suid, info_class, (__u32)info_type, rc);
4093         }
4094
4095         free_rsp_buf(resp_buftype, rsp);
4096         kfree(iov);
4097         return rc;
4098 }
4099
4100 int
4101 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4102              u64 volatile_fid, u32 pid, __le64 *eof)
4103 {
4104         struct smb2_file_eof_info info;
4105         void *data;
4106         unsigned int size;
4107
4108         info.EndOfFile = *eof;
4109
4110         data = &info;
4111         size = sizeof(struct smb2_file_eof_info);
4112
4113         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4114                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4115                         0, 1, &data, &size);
4116 }
4117
4118 int
4119 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4120                 u64 persistent_fid, u64 volatile_fid,
4121                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4122 {
4123         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4124                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4125                         1, (void **)&pnntsd, &pacllen);
4126 }
4127
4128 int
4129 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4130             u64 persistent_fid, u64 volatile_fid,
4131             struct smb2_file_full_ea_info *buf, int len)
4132 {
4133         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4134                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4135                 0, 1, (void **)&buf, &len);
4136 }
4137
4138 int
4139 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4140                   const u64 persistent_fid, const u64 volatile_fid,
4141                   __u8 oplock_level)
4142 {
4143         struct smb_rqst rqst;
4144         int rc;
4145         struct smb2_oplock_break *req = NULL;
4146         struct cifs_ses *ses = tcon->ses;
4147         int flags = CIFS_OBREAK_OP;
4148         unsigned int total_len;
4149         struct kvec iov[1];
4150         struct kvec rsp_iov;
4151         int resp_buf_type;
4152
4153         cifs_dbg(FYI, "SMB2_oplock_break\n");
4154         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4155                              &total_len);
4156         if (rc)
4157                 return rc;
4158
4159         if (smb3_encryption_required(tcon))
4160                 flags |= CIFS_TRANSFORM_REQ;
4161
4162         req->VolatileFid = volatile_fid;
4163         req->PersistentFid = persistent_fid;
4164         req->OplockLevel = oplock_level;
4165         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4166
4167         flags |= CIFS_NO_RESP;
4168
4169         iov[0].iov_base = (char *)req;
4170         iov[0].iov_len = total_len;
4171
4172         memset(&rqst, 0, sizeof(struct smb_rqst));
4173         rqst.rq_iov = iov;
4174         rqst.rq_nvec = 1;
4175
4176         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4177         cifs_small_buf_release(req);
4178
4179         if (rc) {
4180                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4181                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
4182         }
4183
4184         return rc;
4185 }
4186
4187 void
4188 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
4189                              struct kstatfs *kst)
4190 {
4191         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
4192                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
4193         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
4194         kst->f_bfree  = kst->f_bavail =
4195                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
4196         return;
4197 }
4198
4199 static void
4200 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
4201                         struct kstatfs *kst)
4202 {
4203         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
4204         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
4205         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
4206         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
4207                 kst->f_bavail = kst->f_bfree;
4208         else
4209                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
4210         if (response_data->TotalFileNodes != cpu_to_le64(-1))
4211                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
4212         if (response_data->FreeFileNodes != cpu_to_le64(-1))
4213                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
4214
4215         return;
4216 }
4217
4218 static int
4219 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
4220                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
4221 {
4222         int rc;
4223         struct smb2_query_info_req *req;
4224         unsigned int total_len;
4225
4226         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
4227
4228         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
4229                 return -EIO;
4230
4231         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
4232                              &total_len);
4233         if (rc)
4234                 return rc;
4235
4236         req->InfoType = SMB2_O_INFO_FILESYSTEM;
4237         req->FileInfoClass = level;
4238         req->PersistentFileId = persistent_fid;
4239         req->VolatileFileId = volatile_fid;
4240         /* 1 for pad */
4241         req->InputBufferOffset =
4242                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4243         req->OutputBufferLength = cpu_to_le32(
4244                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4245
4246         iov->iov_base = (char *)req;
4247         iov->iov_len = total_len;
4248         return 0;
4249 }
4250
4251 int
4252 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4253               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4254 {
4255         struct smb_rqst rqst;
4256         struct smb2_query_info_rsp *rsp = NULL;
4257         struct kvec iov;
4258         struct kvec rsp_iov;
4259         int rc = 0;
4260         int resp_buftype;
4261         struct cifs_ses *ses = tcon->ses;
4262         FILE_SYSTEM_POSIX_INFO *info = NULL;
4263         int flags = 0;
4264
4265         rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4266                                 sizeof(FILE_SYSTEM_POSIX_INFO),
4267                                 persistent_fid, volatile_fid);
4268         if (rc)
4269                 return rc;
4270
4271         if (smb3_encryption_required(tcon))
4272                 flags |= CIFS_TRANSFORM_REQ;
4273
4274         memset(&rqst, 0, sizeof(struct smb_rqst));
4275         rqst.rq_iov = &iov;
4276         rqst.rq_nvec = 1;
4277
4278         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4279         cifs_small_buf_release(iov.iov_base);
4280         if (rc) {
4281                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4282                 goto posix_qfsinf_exit;
4283         }
4284         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4285
4286         info = (FILE_SYSTEM_POSIX_INFO *)(
4287                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4288         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4289                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4290                                sizeof(FILE_SYSTEM_POSIX_INFO));
4291         if (!rc)
4292                 copy_posix_fs_info_to_kstatfs(info, fsdata);
4293
4294 posix_qfsinf_exit:
4295         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4296         return rc;
4297 }
4298
4299 int
4300 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
4301               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4302 {
4303         struct smb_rqst rqst;
4304         struct smb2_query_info_rsp *rsp = NULL;
4305         struct kvec iov;
4306         struct kvec rsp_iov;
4307         int rc = 0;
4308         int resp_buftype;
4309         struct cifs_ses *ses = tcon->ses;
4310         struct smb2_fs_full_size_info *info = NULL;
4311         int flags = 0;
4312
4313         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
4314                                 sizeof(struct smb2_fs_full_size_info),
4315                                 persistent_fid, volatile_fid);
4316         if (rc)
4317                 return rc;
4318
4319         if (smb3_encryption_required(tcon))
4320                 flags |= CIFS_TRANSFORM_REQ;
4321
4322         memset(&rqst, 0, sizeof(struct smb_rqst));
4323         rqst.rq_iov = &iov;
4324         rqst.rq_nvec = 1;
4325
4326         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4327         cifs_small_buf_release(iov.iov_base);
4328         if (rc) {
4329                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4330                 goto qfsinf_exit;
4331         }
4332         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4333
4334         info = (struct smb2_fs_full_size_info *)(
4335                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4336         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4337                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4338                                sizeof(struct smb2_fs_full_size_info));
4339         if (!rc)
4340                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
4341
4342 qfsinf_exit:
4343         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4344         return rc;
4345 }
4346
4347 int
4348 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4349               u64 persistent_fid, u64 volatile_fid, int level)
4350 {
4351         struct smb_rqst rqst;
4352         struct smb2_query_info_rsp *rsp = NULL;
4353         struct kvec iov;
4354         struct kvec rsp_iov;
4355         int rc = 0;
4356         int resp_buftype, max_len, min_len;
4357         struct cifs_ses *ses = tcon->ses;
4358         unsigned int rsp_len, offset;
4359         int flags = 0;
4360
4361         if (level == FS_DEVICE_INFORMATION) {
4362                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4363                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4364         } else if (level == FS_ATTRIBUTE_INFORMATION) {
4365                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4366                 min_len = MIN_FS_ATTR_INFO_SIZE;
4367         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4368                 max_len = sizeof(struct smb3_fs_ss_info);
4369                 min_len = sizeof(struct smb3_fs_ss_info);
4370         } else if (level == FS_VOLUME_INFORMATION) {
4371                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
4372                 min_len = sizeof(struct smb3_fs_vol_info);
4373         } else {
4374                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4375                 return -EINVAL;
4376         }
4377
4378         rc = build_qfs_info_req(&iov, tcon, level, max_len,
4379                                 persistent_fid, volatile_fid);
4380         if (rc)
4381                 return rc;
4382
4383         if (smb3_encryption_required(tcon))
4384                 flags |= CIFS_TRANSFORM_REQ;
4385
4386         memset(&rqst, 0, sizeof(struct smb_rqst));
4387         rqst.rq_iov = &iov;
4388         rqst.rq_nvec = 1;
4389
4390         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4391         cifs_small_buf_release(iov.iov_base);
4392         if (rc) {
4393                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4394                 goto qfsattr_exit;
4395         }
4396         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4397
4398         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4399         offset = le16_to_cpu(rsp->OutputBufferOffset);
4400         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
4401         if (rc)
4402                 goto qfsattr_exit;
4403
4404         if (level == FS_ATTRIBUTE_INFORMATION)
4405                 memcpy(&tcon->fsAttrInfo, offset
4406                         + (char *)rsp, min_t(unsigned int,
4407                         rsp_len, max_len));
4408         else if (level == FS_DEVICE_INFORMATION)
4409                 memcpy(&tcon->fsDevInfo, offset
4410                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4411         else if (level == FS_SECTOR_SIZE_INFORMATION) {
4412                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4413                         (offset + (char *)rsp);
4414                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4415                 tcon->perf_sector_size =
4416                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4417         } else if (level == FS_VOLUME_INFORMATION) {
4418                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
4419                         (offset + (char *)rsp);
4420                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
4421                 tcon->vol_create_time = vol_info->VolumeCreationTime;
4422         }
4423
4424 qfsattr_exit:
4425         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4426         return rc;
4427 }
4428
4429 int
4430 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4431            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4432            const __u32 num_lock, struct smb2_lock_element *buf)
4433 {
4434         struct smb_rqst rqst;
4435         int rc = 0;
4436         struct smb2_lock_req *req = NULL;
4437         struct kvec iov[2];
4438         struct kvec rsp_iov;
4439         int resp_buf_type;
4440         unsigned int count;
4441         int flags = CIFS_NO_RESP;
4442         unsigned int total_len;
4443
4444         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4445
4446         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4447         if (rc)
4448                 return rc;
4449
4450         if (smb3_encryption_required(tcon))
4451                 flags |= CIFS_TRANSFORM_REQ;
4452
4453         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4454         req->LockCount = cpu_to_le16(num_lock);
4455
4456         req->PersistentFileId = persist_fid;
4457         req->VolatileFileId = volatile_fid;
4458
4459         count = num_lock * sizeof(struct smb2_lock_element);
4460
4461         iov[0].iov_base = (char *)req;
4462         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4463         iov[1].iov_base = (char *)buf;
4464         iov[1].iov_len = count;
4465
4466         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4467
4468         memset(&rqst, 0, sizeof(struct smb_rqst));
4469         rqst.rq_iov = iov;
4470         rqst.rq_nvec = 2;
4471
4472         rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4473                             &rsp_iov);
4474         cifs_small_buf_release(req);
4475         if (rc) {
4476                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4477                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4478                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4479                                     tcon->ses->Suid, rc);
4480         }
4481
4482         return rc;
4483 }
4484
4485 int
4486 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
4487           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4488           const __u64 length, const __u64 offset, const __u32 lock_flags,
4489           const bool wait)
4490 {
4491         struct smb2_lock_element lock;
4492
4493         lock.Offset = cpu_to_le64(offset);
4494         lock.Length = cpu_to_le64(length);
4495         lock.Flags = cpu_to_le32(lock_flags);
4496         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
4497                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
4498
4499         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
4500 }
4501
4502 int
4503 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
4504                  __u8 *lease_key, const __le32 lease_state)
4505 {
4506         struct smb_rqst rqst;
4507         int rc;
4508         struct smb2_lease_ack *req = NULL;
4509         struct cifs_ses *ses = tcon->ses;
4510         int flags = CIFS_OBREAK_OP;
4511         unsigned int total_len;
4512         struct kvec iov[1];
4513         struct kvec rsp_iov;
4514         int resp_buf_type;
4515         __u64 *please_key_high;
4516         __u64 *please_key_low;
4517
4518         cifs_dbg(FYI, "SMB2_lease_break\n");
4519         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4520                              &total_len);
4521         if (rc)
4522                 return rc;
4523
4524         if (smb3_encryption_required(tcon))
4525                 flags |= CIFS_TRANSFORM_REQ;
4526
4527         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4528         req->StructureSize = cpu_to_le16(36);
4529         total_len += 12;
4530
4531         memcpy(req->LeaseKey, lease_key, 16);
4532         req->LeaseState = lease_state;
4533
4534         flags |= CIFS_NO_RESP;
4535
4536         iov[0].iov_base = (char *)req;
4537         iov[0].iov_len = total_len;
4538
4539         memset(&rqst, 0, sizeof(struct smb_rqst));
4540         rqst.rq_iov = iov;
4541         rqst.rq_nvec = 1;
4542
4543         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4544         cifs_small_buf_release(req);
4545
4546         please_key_low = (__u64 *)lease_key;
4547         please_key_high = (__u64 *)(lease_key+8);
4548         if (rc) {
4549                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4550                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
4551                         ses->Suid, *please_key_low, *please_key_high, rc);
4552                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
4553         } else
4554                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
4555                         ses->Suid, *please_key_low, *please_key_high);
4556
4557         return rc;
4558 }