fs/cifs/smb2pdu.c

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