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 && --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                 if ((rc == -EACCES) && !tcon->retry) {
 356                         rc = -EHOSTDOWN;
 357                         mutex_unlock(&tcon->ses->session_mutex);
 358                         goto failed;
 359                 }
 360         }
 361         if (rc || !tcon->need_reconnect) {
 362                 mutex_unlock(&tcon->ses->session_mutex);
 363                 goto out;
 364         }
 365
 366         cifs_mark_open_files_invalid(tcon);
 367         if (tcon->use_persistent)
 368                 tcon->need_reopen_files = true;
 369
 370         rc = __smb2_reconnect(nls_codepage, tcon);
 371         mutex_unlock(&tcon->ses->session_mutex);
 372
 373         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 374         if (rc) {
 375                 /* If sess reconnected but tcon didn't, something strange ... */
 376                 printk_once(KERN_WARNING "reconnect tcon failed rc = %d\n", rc);
 377                 goto out;
 378         }
 379
 380         if (smb2_command != SMB2_INTERNAL_CMD)
 381                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
 382
 383         atomic_inc(&tconInfoReconnectCount);
 384 out:
 385         /*
 386          * Check if handle based operation so we know whether we can continue
 387          * or not without returning to caller to reset file handle.
 388          */
 389         /*
 390          * BB Is flush done by server on drop of tcp session? Should we special
 391          * case it and skip above?
 392          */
 393         switch (smb2_command) {
 394         case SMB2_FLUSH:
 395         case SMB2_READ:
 396         case SMB2_WRITE:
 397         case SMB2_LOCK:
 398         case SMB2_IOCTL:
 399         case SMB2_QUERY_DIRECTORY:
 400         case SMB2_CHANGE_NOTIFY:
 401         case SMB2_QUERY_INFO:
 402         case SMB2_SET_INFO:
 403                 rc = -EAGAIN;
 404         }
 405 failed:
 406         unload_nls(nls_codepage);
 407         return rc;
 408 }
 409
 410 static void
 411 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
 412                unsigned int *total_len)
 413 {
 414         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 415         /* lookup word count ie StructureSize from table */
 416         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 417
 418         /*
 419          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 420          * largest operations (Create)
 421          */
 422         memset(buf, 0, 256);
 423
 424         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
 425         spdu->StructureSize2 = cpu_to_le16(parmsize);
 426
 427         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 428 }
 429
 430 /*
 431  * Allocate and return pointer to an SMB request hdr, and set basic
 432  * SMB information in the SMB header. If the return code is zero, this
 433  * function must have filled in request_buf pointer.
 434  */
 435 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 436                                   void **request_buf, unsigned int *total_len)
 437 {
 438         /* BB eventually switch this to SMB2 specific small buf size */
 439         if (smb2_command == SMB2_SET_INFO)
 440                 *request_buf = cifs_buf_get();
 441         else
 442                 *request_buf = cifs_small_buf_get();
 443         if (*request_buf == NULL) {
 444                 /* BB should we add a retry in here if not a writepage? */
 445                 return -ENOMEM;
 446         }
 447
 448         fill_small_buf(smb2_command, tcon,
 449                        (struct smb2_sync_hdr *)(*request_buf),
 450                        total_len);
 451
 452         if (tcon != NULL) {
 453                 uint16_t com_code = le16_to_cpu(smb2_command);
 454                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 455                 cifs_stats_inc(&tcon->num_smbs_sent);
 456         }
 457
 458         return 0;
 459 }
 460
 461 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 462                                void **request_buf, unsigned int *total_len)
 463 {
 464         int rc;
 465
 466         rc = smb2_reconnect(smb2_command, tcon);
 467         if (rc)
 468                 return rc;
 469
 470         return __smb2_plain_req_init(smb2_command, tcon, request_buf,
 471                                      total_len);
 472 }
 473
 474 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 475                                void **request_buf, unsigned int *total_len)
 476 {
 477         /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
 478         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
 479                 return __smb2_plain_req_init(SMB2_IOCTL, tcon, request_buf,
 480                                              total_len);
 481         }
 482         return smb2_plain_req_init(SMB2_IOCTL, tcon, request_buf, total_len);
 483 }
 484
 485 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 486
 487 static void
 488 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 489 {
 490         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 491         pneg_ctxt->DataLength = cpu_to_le16(38);
 492         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 493         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 494         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 495         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 496 }
 497
 498 static void
 499 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 500 {
 501         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 502         pneg_ctxt->DataLength =
 503                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 504                           - sizeof(struct smb2_neg_context));
 505         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 506         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 507         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 508         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 509 }
 510
 511 static void
 512 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 513 {
 514         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 515         pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + two ciphers */
 516         pneg_ctxt->CipherCount = cpu_to_le16(2);
 517         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 518         pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 519 }
 520
 521 static unsigned int
 522 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 523 {
 524         struct nls_table *cp = load_nls_default();
 525
 526         pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 527
 528         /* copy up to max of first 100 bytes of server name to NetName field */
 529         pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 530         /* context size is DataLength + minimal smb2_neg_context */
 531         return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
 532                         sizeof(struct smb2_neg_context), 8) * 8;
 533 }
 534
 535 static void
 536 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 537 {
 538         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 539         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 540         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 541         pneg_ctxt->Name[0] = 0x93;
 542         pneg_ctxt->Name[1] = 0xAD;
 543         pneg_ctxt->Name[2] = 0x25;
 544         pneg_ctxt->Name[3] = 0x50;
 545         pneg_ctxt->Name[4] = 0x9C;
 546         pneg_ctxt->Name[5] = 0xB4;
 547         pneg_ctxt->Name[6] = 0x11;
 548         pneg_ctxt->Name[7] = 0xE7;
 549         pneg_ctxt->Name[8] = 0xB4;
 550         pneg_ctxt->Name[9] = 0x23;
 551         pneg_ctxt->Name[10] = 0x83;
 552         pneg_ctxt->Name[11] = 0xDE;
 553         pneg_ctxt->Name[12] = 0x96;
 554         pneg_ctxt->Name[13] = 0x8B;
 555         pneg_ctxt->Name[14] = 0xCD;
 556         pneg_ctxt->Name[15] = 0x7C;
 557 }
 558
 559 static void
 560 assemble_neg_contexts(struct smb2_negotiate_req *req,
 561                       struct TCP_Server_Info *server, unsigned int *total_len)
 562 {
 563         char *pneg_ctxt;
 564         unsigned int ctxt_len;
 565
 566         if (*total_len > 200) {
 567                 /* In case length corrupted don't want to overrun smb buffer */
 568                 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 569                 return;
 570         }
 571
 572         /*
 573          * round up total_len of fixed part of SMB3 negotiate request to 8
 574          * byte boundary before adding negotiate contexts
 575          */
 576         *total_len = roundup(*total_len, 8);
 577
 578         pneg_ctxt = (*total_len) + (char *)req;
 579         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 580
 581         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 582         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 583         *total_len += ctxt_len;
 584         pneg_ctxt += ctxt_len;
 585
 586         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 587         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 588         *total_len += ctxt_len;
 589         pneg_ctxt += ctxt_len;
 590
 591         if (server->compress_algorithm) {
 592                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 593                                 pneg_ctxt);
 594                 ctxt_len = DIV_ROUND_UP(
 595                         sizeof(struct smb2_compression_capabilities_context),
 596                                 8) * 8;
 597                 *total_len += ctxt_len;
 598                 pneg_ctxt += ctxt_len;
 599                 req->NegotiateContextCount = cpu_to_le16(5);
 600         } else
 601                 req->NegotiateContextCount = cpu_to_le16(4);
 602
 603         ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 604                                         server->hostname);
 605         *total_len += ctxt_len;
 606         pneg_ctxt += ctxt_len;
 607
 608         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 609         *total_len += sizeof(struct smb2_posix_neg_context);
 610 }
 611
 612 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 613 {
 614         unsigned int len = le16_to_cpu(ctxt->DataLength);
 615
 616         /* If invalid preauth context warn but use what we requested, SHA-512 */
 617         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 618                 printk_once(KERN_WARNING "server sent bad preauth context\n");
 619                 return;
 620         }
 621         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 622                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
 623         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 624                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
 625 }
 626
 627 static void decode_compress_ctx(struct TCP_Server_Info *server,
 628                          struct smb2_compression_capabilities_context *ctxt)
 629 {
 630         unsigned int len = le16_to_cpu(ctxt->DataLength);
 631
 632         /* sizeof compress context is a one element compression capbility struct */
 633         if (len < 10) {
 634                 printk_once(KERN_WARNING "server sent bad compression cntxt\n");
 635                 return;
 636         }
 637         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 638                 printk_once(KERN_WARNING "illegal SMB3 compress algorithm count\n");
 639                 return;
 640         }
 641         if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 642                 printk_once(KERN_WARNING "unknown compression algorithm\n");
 643                 return;
 644         }
 645         server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 646 }
 647
 648 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 649                               struct smb2_encryption_neg_context *ctxt)
 650 {
 651         unsigned int len = le16_to_cpu(ctxt->DataLength);
 652
 653         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 654         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 655                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
 656                 return -EINVAL;
 657         }
 658
 659         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 660                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
 661                 return -EINVAL;
 662         }
 663         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 664         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 665             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 666                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
 667                 return -EINVAL;
 668         }
 669         server->cipher_type = ctxt->Ciphers[0];
 670         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 671         return 0;
 672 }
 673
 674 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 675                                      struct TCP_Server_Info *server,
 676                                      unsigned int len_of_smb)
 677 {
 678         struct smb2_neg_context *pctx;
 679         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 680         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 681         unsigned int len_of_ctxts, i;
 682         int rc = 0;
 683
 684         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 685         if (len_of_smb <= offset) {
 686                 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 687                 return -EINVAL;
 688         }
 689
 690         len_of_ctxts = len_of_smb - offset;
 691
 692         for (i = 0; i < ctxt_cnt; i++) {
 693                 int clen;
 694                 /* check that offset is not beyond end of SMB */
 695                 if (len_of_ctxts == 0)
 696                         break;
 697
 698                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 699                         break;
 700
 701                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 702                 clen = le16_to_cpu(pctx->DataLength);
 703                 if (clen > len_of_ctxts)
 704                         break;
 705
 706                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 707                         decode_preauth_context(
 708                                 (struct smb2_preauth_neg_context *)pctx);
 709                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 710                         rc = decode_encrypt_ctx(server,
 711                                 (struct smb2_encryption_neg_context *)pctx);
 712                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 713                         decode_compress_ctx(server,
 714                                 (struct smb2_compression_capabilities_context *)pctx);
 715                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 716                         server->posix_ext_supported = true;
 717                 else
 718                         cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 719                                 le16_to_cpu(pctx->ContextType));
 720
 721                 if (rc)
 722                         break;
 723                 /* offsets must be 8 byte aligned */
 724                 clen = (clen + 7) & ~0x7;
 725                 offset += clen + sizeof(struct smb2_neg_context);
 726                 len_of_ctxts -= clen;
 727         }
 728         return rc;
 729 }
 730
 731 static struct create_posix *
 732 create_posix_buf(umode_t mode)
 733 {
 734         struct create_posix *buf;
 735
 736         buf = kzalloc(sizeof(struct create_posix),
 737                         GFP_KERNEL);
 738         if (!buf)
 739                 return NULL;
 740
 741         buf->ccontext.DataOffset =
 742                 cpu_to_le16(offsetof(struct create_posix, Mode));
 743         buf->ccontext.DataLength = cpu_to_le32(4);
 744         buf->ccontext.NameOffset =
 745                 cpu_to_le16(offsetof(struct create_posix, Name));
 746         buf->ccontext.NameLength = cpu_to_le16(16);
 747
 748         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 749         buf->Name[0] = 0x93;
 750         buf->Name[1] = 0xAD;
 751         buf->Name[2] = 0x25;
 752         buf->Name[3] = 0x50;
 753         buf->Name[4] = 0x9C;
 754         buf->Name[5] = 0xB4;
 755         buf->Name[6] = 0x11;
 756         buf->Name[7] = 0xE7;
 757         buf->Name[8] = 0xB4;
 758         buf->Name[9] = 0x23;
 759         buf->Name[10] = 0x83;
 760         buf->Name[11] = 0xDE;
 761         buf->Name[12] = 0x96;
 762         buf->Name[13] = 0x8B;
 763         buf->Name[14] = 0xCD;
 764         buf->Name[15] = 0x7C;
 765         buf->Mode = cpu_to_le32(mode);
 766         cifs_dbg(FYI, "mode on posix create 0%o", mode);
 767         return buf;
 768 }
 769
 770 static int
 771 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 772 {
 773         struct smb2_create_req *req = iov[0].iov_base;
 774         unsigned int num = *num_iovec;
 775
 776         iov[num].iov_base = create_posix_buf(mode);
 777         if (mode == ACL_NO_MODE)
 778                 cifs_dbg(FYI, "illegal mode\n");
 779         if (iov[num].iov_base == NULL)
 780                 return -ENOMEM;
 781         iov[num].iov_len = sizeof(struct create_posix);
 782         if (!req->CreateContextsOffset)
 783                 req->CreateContextsOffset = cpu_to_le32(
 784                                 sizeof(struct smb2_create_req) +
 785                                 iov[num - 1].iov_len);
 786         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 787         *num_iovec = num + 1;
 788         return 0;
 789 }
 790
 791
 792 /*
 793  *
 794  *      SMB2 Worker functions follow:
 795  *
 796  *      The general structure of the worker functions is:
 797  *      1) Call smb2_init (assembles SMB2 header)
 798  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 799  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 800  *      4) Decode SMB2 command specific fields in the fixed length area
 801  *      5) Decode variable length data area (if any for this SMB2 command type)
 802  *      6) Call free smb buffer
 803  *      7) return
 804  *
 805  */
 806
 807 int
 808 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 809 {
 810         struct smb_rqst rqst;
 811         struct smb2_negotiate_req *req;
 812         struct smb2_negotiate_rsp *rsp;
 813         struct kvec iov[1];
 814         struct kvec rsp_iov;
 815         int rc = 0;
 816         int resp_buftype;
 817         struct TCP_Server_Info *server = cifs_ses_server(ses);
 818         int blob_offset, blob_length;
 819         char *security_blob;
 820         int flags = CIFS_NEG_OP;
 821         unsigned int total_len;
 822
 823         cifs_dbg(FYI, "Negotiate protocol\n");
 824
 825         if (!server) {
 826                 WARN(1, "%s: server is NULL!\n", __func__);
 827                 return -EIO;
 828         }
 829
 830         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 831         if (rc)
 832                 return rc;
 833
 834         req->sync_hdr.SessionId = 0;
 835
 836         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 837         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 838
 839         if (strcmp(server->vals->version_string,
 840                    SMB3ANY_VERSION_STRING) == 0) {
 841                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 842                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 843                 req->DialectCount = cpu_to_le16(2);
 844                 total_len += 4;
 845         } else if (strcmp(server->vals->version_string,
 846                    SMBDEFAULT_VERSION_STRING) == 0) {
 847                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 848                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 849                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 850                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 851                 req->DialectCount = cpu_to_le16(4);
 852                 total_len += 8;
 853         } else {
 854                 /* otherwise send specific dialect */
 855                 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
 856                 req->DialectCount = cpu_to_le16(1);
 857                 total_len += 2;
 858         }
 859
 860         /* only one of SMB2 signing flags may be set in SMB2 request */
 861         if (ses->sign)
 862                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 863         else if (global_secflags & CIFSSEC_MAY_SIGN)
 864                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 865         else
 866                 req->SecurityMode = 0;
 867
 868         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
 869
 870         /* ClientGUID must be zero for SMB2.02 dialect */
 871         if (server->vals->protocol_id == SMB20_PROT_ID)
 872                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 873         else {
 874                 memcpy(req->ClientGUID, server->client_guid,
 875                         SMB2_CLIENT_GUID_SIZE);
 876                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
 877                     (strcmp(server->vals->version_string,
 878                      SMBDEFAULT_VERSION_STRING) == 0))
 879                         assemble_neg_contexts(req, server, &total_len);
 880         }
 881         iov[0].iov_base = (char *)req;
 882         iov[0].iov_len = total_len;
 883
 884         memset(&rqst, 0, sizeof(struct smb_rqst));
 885         rqst.rq_iov = iov;
 886         rqst.rq_nvec = 1;
 887
 888         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
 889         cifs_small_buf_release(req);
 890         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 891         /*
 892          * No tcon so can't do
 893          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 894          */
 895         if (rc == -EOPNOTSUPP) {
 896                 cifs_server_dbg(VFS, "Dialect not supported by server. Consider "
 897                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 898                         " older servers\n");
 899                 goto neg_exit;
 900         } else if (rc != 0)
 901                 goto neg_exit;
 902
 903         if (strcmp(server->vals->version_string,
 904                    SMB3ANY_VERSION_STRING) == 0) {
 905                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 906                         cifs_server_dbg(VFS,
 907                                 "SMB2 dialect returned but not requested\n");
 908                         return -EIO;
 909                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 910                         cifs_server_dbg(VFS,
 911                                 "SMB2.1 dialect returned but not requested\n");
 912                         return -EIO;
 913                 }
 914         } else if (strcmp(server->vals->version_string,
 915                    SMBDEFAULT_VERSION_STRING) == 0) {
 916                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 917                         cifs_server_dbg(VFS,
 918                                 "SMB2 dialect returned but not requested\n");
 919                         return -EIO;
 920                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 921                         /* ops set to 3.0 by default for default so update */
 922                         server->ops = &smb21_operations;
 923                         server->vals = &smb21_values;
 924                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 925                         server->ops = &smb311_operations;
 926                         server->vals = &smb311_values;
 927                 }
 928         } else if (le16_to_cpu(rsp->DialectRevision) !=
 929                                 server->vals->protocol_id) {
 930                 /* if requested single dialect ensure returned dialect matched */
 931                 cifs_server_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 932                         le16_to_cpu(rsp->DialectRevision));
 933                 return -EIO;
 934         }
 935
 936         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 937
 938         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 939                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 940         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 941                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 942         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 943                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 944         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 945                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 946         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 947                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 948         else {
 949                 cifs_server_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 950                          le16_to_cpu(rsp->DialectRevision));
 951                 rc = -EIO;
 952                 goto neg_exit;
 953         }
 954         server->dialect = le16_to_cpu(rsp->DialectRevision);
 955
 956         /*
 957          * Keep a copy of the hash after negprot. This hash will be
 958          * the starting hash value for all sessions made from this
 959          * server.
 960          */
 961         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 962                SMB2_PREAUTH_HASH_SIZE);
 963
 964         /* SMB2 only has an extended negflavor */
 965         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 966         /* set it to the maximum buffer size value we can send with 1 credit */
 967         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 968                                SMB2_MAX_BUFFER_SIZE);
 969         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 970         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 971         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 972         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 973                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 974                                 server->sec_mode);
 975         server->capabilities = le32_to_cpu(rsp->Capabilities);
 976         /* Internal types */
 977         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 978
 979         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 980                                                (struct smb2_sync_hdr *)rsp);
 981         /*
 982          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 983          * for us will be
 984          *      ses->sectype = RawNTLMSSP;
 985          * but for time being this is our only auth choice so doesn't matter.
 986          * We just found a server which sets blob length to zero expecting raw.
 987          */
 988         if (blob_length == 0) {
 989                 cifs_dbg(FYI, "missing security blob on negprot\n");
 990                 server->sec_ntlmssp = true;
 991         }
 992
 993         rc = cifs_enable_signing(server, ses->sign);
 994         if (rc)
 995                 goto neg_exit;
 996         if (blob_length) {
 997                 rc = decode_negTokenInit(security_blob, blob_length, server);
 998                 if (rc == 1)
 999                         rc = 0;
1000                 else if (rc == 0)
1001                         rc = -EIO;
1002         }
1003
1004         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1005                 if (rsp->NegotiateContextCount)
1006                         rc = smb311_decode_neg_context(rsp, server,
1007                                                        rsp_iov.iov_len);
1008                 else
1009                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
1010         }
1011 neg_exit:
1012         free_rsp_buf(resp_buftype, rsp);
1013         return rc;
1014 }
1015
1016 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1017 {
1018         int rc;
1019         struct validate_negotiate_info_req *pneg_inbuf;
1020         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1021         u32 rsplen;
1022         u32 inbuflen; /* max of 4 dialects */
1023         struct TCP_Server_Info *server = tcon->ses->server;
1024
1025         cifs_dbg(FYI, "validate negotiate\n");
1026
1027         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1028         if (server->dialect == SMB311_PROT_ID)
1029                 return 0;
1030
1031         /*
1032          * validation ioctl must be signed, so no point sending this if we
1033          * can not sign it (ie are not known user).  Even if signing is not
1034          * required (enabled but not negotiated), in those cases we selectively
1035          * sign just this, the first and only signed request on a connection.
1036          * Having validation of negotiate info  helps reduce attack vectors.
1037          */
1038         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1039                 return 0; /* validation requires signing */
1040
1041         if (tcon->ses->user_name == NULL) {
1042                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1043                 return 0; /* validation requires signing */
1044         }
1045
1046         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1047                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1048
1049         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1050         if (!pneg_inbuf)
1051                 return -ENOMEM;
1052
1053         pneg_inbuf->Capabilities =
1054                         cpu_to_le32(server->vals->req_capabilities);
1055         memcpy(pneg_inbuf->Guid, server->client_guid,
1056                                         SMB2_CLIENT_GUID_SIZE);
1057
1058         if (tcon->ses->sign)
1059                 pneg_inbuf->SecurityMode =
1060                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1061         else if (global_secflags & CIFSSEC_MAY_SIGN)
1062                 pneg_inbuf->SecurityMode =
1063                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1064         else
1065                 pneg_inbuf->SecurityMode = 0;
1066
1067
1068         if (strcmp(server->vals->version_string,
1069                 SMB3ANY_VERSION_STRING) == 0) {
1070                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1071                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1072                 pneg_inbuf->DialectCount = cpu_to_le16(2);
1073                 /* structure is big enough for 3 dialects, sending only 2 */
1074                 inbuflen = sizeof(*pneg_inbuf) -
1075                                 (2 * sizeof(pneg_inbuf->Dialects[0]));
1076         } else if (strcmp(server->vals->version_string,
1077                 SMBDEFAULT_VERSION_STRING) == 0) {
1078                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1079                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1080                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1081                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1082                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1083                 /* structure is big enough for 3 dialects */
1084                 inbuflen = sizeof(*pneg_inbuf);
1085         } else {
1086                 /* otherwise specific dialect was requested */
1087                 pneg_inbuf->Dialects[0] =
1088                         cpu_to_le16(server->vals->protocol_id);
1089                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1090                 /* structure is big enough for 3 dialects, sending only 1 */
1091                 inbuflen = sizeof(*pneg_inbuf) -
1092                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
1093         }
1094
1095         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1096                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1097                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1098                 (char **)&pneg_rsp, &rsplen);
1099         if (rc == -EOPNOTSUPP) {
1100                 /*
1101                  * Old Windows versions or Netapp SMB server can return
1102                  * not supported error. Client should accept it.
1103                  */
1104                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1105                 rc = 0;
1106                 goto out_free_inbuf;
1107         } else if (rc != 0) {
1108                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
1109                 rc = -EIO;
1110                 goto out_free_inbuf;
1111         }
1112
1113         rc = -EIO;
1114         if (rsplen != sizeof(*pneg_rsp)) {
1115                 cifs_tcon_dbg(VFS, "invalid protocol negotiate response size: %d\n",
1116                          rsplen);
1117
1118                 /* relax check since Mac returns max bufsize allowed on ioctl */
1119                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1120                         goto out_free_rsp;
1121         }
1122
1123         /* check validate negotiate info response matches what we got earlier */
1124         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1125                 goto vneg_out;
1126
1127         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1128                 goto vneg_out;
1129
1130         /* do not validate server guid because not saved at negprot time yet */
1131
1132         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1133               SMB2_LARGE_FILES) != server->capabilities)
1134                 goto vneg_out;
1135
1136         /* validate negotiate successful */
1137         rc = 0;
1138         cifs_dbg(FYI, "validate negotiate info successful\n");
1139         goto out_free_rsp;
1140
1141 vneg_out:
1142         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1143 out_free_rsp:
1144         kfree(pneg_rsp);
1145 out_free_inbuf:
1146         kfree(pneg_inbuf);
1147         return rc;
1148 }
1149
1150 enum securityEnum
1151 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1152 {
1153         switch (requested) {
1154         case Kerberos:
1155         case RawNTLMSSP:
1156                 return requested;
1157         case NTLMv2:
1158                 return RawNTLMSSP;
1159         case Unspecified:
1160                 if (server->sec_ntlmssp &&
1161                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1162                         return RawNTLMSSP;
1163                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1164                         (global_secflags & CIFSSEC_MAY_KRB5))
1165                         return Kerberos;
1166                 /* Fallthrough */
1167         default:
1168                 return Unspecified;
1169         }
1170 }
1171
1172 struct SMB2_sess_data {
1173         unsigned int xid;
1174         struct cifs_ses *ses;
1175         struct nls_table *nls_cp;
1176         void (*func)(struct SMB2_sess_data *);
1177         int result;
1178         u64 previous_session;
1179
1180         /* we will send the SMB in three pieces:
1181          * a fixed length beginning part, an optional
1182          * SPNEGO blob (which can be zero length), and a
1183          * last part which will include the strings
1184          * and rest of bcc area. This allows us to avoid
1185          * a large buffer 17K allocation
1186          */
1187         int buf0_type;
1188         struct kvec iov[2];
1189 };
1190
1191 static int
1192 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1193 {
1194         int rc;
1195         struct cifs_ses *ses = sess_data->ses;
1196         struct smb2_sess_setup_req *req;
1197         struct TCP_Server_Info *server = cifs_ses_server(ses);
1198         unsigned int total_len;
1199
1200         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
1201                              &total_len);
1202         if (rc)
1203                 return rc;
1204
1205         if (sess_data->ses->binding) {
1206                 req->sync_hdr.SessionId = sess_data->ses->Suid;
1207                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1208                 req->PreviousSessionId = 0;
1209                 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1210         } else {
1211                 /* First session, not a reauthenticate */
1212                 req->sync_hdr.SessionId = 0;
1213                 /*
1214                  * if reconnect, we need to send previous sess id
1215                  * otherwise it is 0
1216                  */
1217                 req->PreviousSessionId = sess_data->previous_session;
1218                 req->Flags = 0; /* MBZ */
1219         }
1220
1221         /* enough to enable echos and oplocks and one max size write */
1222         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1223
1224         /* only one of SMB2 signing flags may be set in SMB2 request */
1225         if (server->sign)
1226                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1227         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1228                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1229         else
1230                 req->SecurityMode = 0;
1231
1232 #ifdef CONFIG_CIFS_DFS_UPCALL
1233         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1234 #else
1235         req->Capabilities = 0;
1236 #endif /* DFS_UPCALL */
1237
1238         req->Channel = 0; /* MBZ */
1239
1240         sess_data->iov[0].iov_base = (char *)req;
1241         /* 1 for pad */
1242         sess_data->iov[0].iov_len = total_len - 1;
1243         /*
1244          * This variable will be used to clear the buffer
1245          * allocated above in case of any error in the calling function.
1246          */
1247         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1248
1249         return 0;
1250 }
1251
1252 static void
1253 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1254 {
1255         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1256         sess_data->buf0_type = CIFS_NO_BUFFER;
1257 }
1258
1259 static int
1260 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1261 {
1262         int rc;
1263         struct smb_rqst rqst;
1264         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1265         struct kvec rsp_iov = { NULL, 0 };
1266
1267         /* Testing shows that buffer offset must be at location of Buffer[0] */
1268         req->SecurityBufferOffset =
1269                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1270         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1271
1272         memset(&rqst, 0, sizeof(struct smb_rqst));
1273         rqst.rq_iov = sess_data->iov;
1274         rqst.rq_nvec = 2;
1275
1276         /* BB add code to build os and lm fields */
1277         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1278                             &rqst,
1279                             &sess_data->buf0_type,
1280                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1281         cifs_small_buf_release(sess_data->iov[0].iov_base);
1282         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1283
1284         return rc;
1285 }
1286
1287 static int
1288 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1289 {
1290         int rc = 0;
1291         struct cifs_ses *ses = sess_data->ses;
1292         struct TCP_Server_Info *server = cifs_ses_server(ses);
1293
1294         mutex_lock(&server->srv_mutex);
1295         if (server->ops->generate_signingkey) {
1296                 rc = server->ops->generate_signingkey(ses);
1297                 if (rc) {
1298                         cifs_dbg(FYI,
1299                                 "SMB3 session key generation failed\n");
1300                         mutex_unlock(&server->srv_mutex);
1301                         return rc;
1302                 }
1303         }
1304         if (!server->session_estab) {
1305                 server->sequence_number = 0x2;
1306                 server->session_estab = true;
1307         }
1308         mutex_unlock(&server->srv_mutex);
1309
1310         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1311         /* keep existing ses state if binding */
1312         if (!ses->binding) {
1313                 spin_lock(&GlobalMid_Lock);
1314                 ses->status = CifsGood;
1315                 ses->need_reconnect = false;
1316                 spin_unlock(&GlobalMid_Lock);
1317         }
1318
1319         return rc;
1320 }
1321
1322 #ifdef CONFIG_CIFS_UPCALL
1323 static void
1324 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1325 {
1326         int rc;
1327         struct cifs_ses *ses = sess_data->ses;
1328         struct cifs_spnego_msg *msg;
1329         struct key *spnego_key = NULL;
1330         struct smb2_sess_setup_rsp *rsp = NULL;
1331
1332         rc = SMB2_sess_alloc_buffer(sess_data);
1333         if (rc)
1334                 goto out;
1335
1336         spnego_key = cifs_get_spnego_key(ses);
1337         if (IS_ERR(spnego_key)) {
1338                 rc = PTR_ERR(spnego_key);
1339                 spnego_key = NULL;
1340                 goto out;
1341         }
1342
1343         msg = spnego_key->payload.data[0];
1344         /*
1345          * check version field to make sure that cifs.upcall is
1346          * sending us a response in an expected form
1347          */
1348         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1349                 cifs_dbg(VFS,
1350                           "bad cifs.upcall version. Expected %d got %d",
1351                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1352                 rc = -EKEYREJECTED;
1353                 goto out_put_spnego_key;
1354         }
1355
1356         /* keep session key if binding */
1357         if (!ses->binding) {
1358                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1359                                                  GFP_KERNEL);
1360                 if (!ses->auth_key.response) {
1361                         cifs_dbg(VFS,
1362                                  "Kerberos can't allocate (%u bytes) memory",
1363                                  msg->sesskey_len);
1364                         rc = -ENOMEM;
1365                         goto out_put_spnego_key;
1366                 }
1367                 ses->auth_key.len = msg->sesskey_len;
1368         }
1369
1370         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1371         sess_data->iov[1].iov_len = msg->secblob_len;
1372
1373         rc = SMB2_sess_sendreceive(sess_data);
1374         if (rc)
1375                 goto out_put_spnego_key;
1376
1377         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1378         /* keep session id and flags if binding */
1379         if (!ses->binding) {
1380                 ses->Suid = rsp->sync_hdr.SessionId;
1381                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1382         }
1383
1384         rc = SMB2_sess_establish_session(sess_data);
1385 out_put_spnego_key:
1386         key_invalidate(spnego_key);
1387         key_put(spnego_key);
1388 out:
1389         sess_data->result = rc;
1390         sess_data->func = NULL;
1391         SMB2_sess_free_buffer(sess_data);
1392 }
1393 #else
1394 static void
1395 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1396 {
1397         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1398         sess_data->result = -EOPNOTSUPP;
1399         sess_data->func = NULL;
1400 }
1401 #endif
1402
1403 static void
1404 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1405
1406 static void
1407 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1408 {
1409         int rc;
1410         struct cifs_ses *ses = sess_data->ses;
1411         struct smb2_sess_setup_rsp *rsp = NULL;
1412         char *ntlmssp_blob = NULL;
1413         bool use_spnego = false; /* else use raw ntlmssp */
1414         u16 blob_length = 0;
1415
1416         /*
1417          * If memory allocation is successful, caller of this function
1418          * frees it.
1419          */
1420         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1421         if (!ses->ntlmssp) {
1422                 rc = -ENOMEM;
1423                 goto out_err;
1424         }
1425         ses->ntlmssp->sesskey_per_smbsess = true;
1426
1427         rc = SMB2_sess_alloc_buffer(sess_data);
1428         if (rc)
1429                 goto out_err;
1430
1431         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1432                                GFP_KERNEL);
1433         if (ntlmssp_blob == NULL) {
1434                 rc = -ENOMEM;
1435                 goto out;
1436         }
1437
1438         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1439         if (use_spnego) {
1440                 /* BB eventually need to add this */
1441                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1442                 rc = -EOPNOTSUPP;
1443                 goto out;
1444         } else {
1445                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1446                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1447         }
1448         sess_data->iov[1].iov_base = ntlmssp_blob;
1449         sess_data->iov[1].iov_len = blob_length;
1450
1451         rc = SMB2_sess_sendreceive(sess_data);
1452         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1453
1454         /* If true, rc here is expected and not an error */
1455         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1456                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1457                 rc = 0;
1458
1459         if (rc)
1460                 goto out;
1461
1462         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1463                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1464                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1465                         le16_to_cpu(rsp->SecurityBufferOffset));
1466                 rc = -EIO;
1467                 goto out;
1468         }
1469         rc = decode_ntlmssp_challenge(rsp->Buffer,
1470                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1471         if (rc)
1472                 goto out;
1473
1474         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1475
1476         /* keep existing ses id and flags if binding */
1477         if (!ses->binding) {
1478                 ses->Suid = rsp->sync_hdr.SessionId;
1479                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1480         }
1481
1482 out:
1483         kfree(ntlmssp_blob);
1484         SMB2_sess_free_buffer(sess_data);
1485         if (!rc) {
1486                 sess_data->result = 0;
1487                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1488                 return;
1489         }
1490 out_err:
1491         kfree(ses->ntlmssp);
1492         ses->ntlmssp = NULL;
1493         sess_data->result = rc;
1494         sess_data->func = NULL;
1495 }
1496
1497 static void
1498 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1499 {
1500         int rc;
1501         struct cifs_ses *ses = sess_data->ses;
1502         struct smb2_sess_setup_req *req;
1503         struct smb2_sess_setup_rsp *rsp = NULL;
1504         unsigned char *ntlmssp_blob = NULL;
1505         bool use_spnego = false; /* else use raw ntlmssp */
1506         u16 blob_length = 0;
1507
1508         rc = SMB2_sess_alloc_buffer(sess_data);
1509         if (rc)
1510                 goto out;
1511
1512         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1513         req->sync_hdr.SessionId = ses->Suid;
1514
1515         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1516                                         sess_data->nls_cp);
1517         if (rc) {
1518                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1519                 goto out;
1520         }
1521
1522         if (use_spnego) {
1523                 /* BB eventually need to add this */
1524                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1525                 rc = -EOPNOTSUPP;
1526                 goto out;
1527         }
1528         sess_data->iov[1].iov_base = ntlmssp_blob;
1529         sess_data->iov[1].iov_len = blob_length;
1530
1531         rc = SMB2_sess_sendreceive(sess_data);
1532         if (rc)
1533                 goto out;
1534
1535         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1536
1537         /* keep existing ses id and flags if binding */
1538         if (!ses->binding) {
1539                 ses->Suid = rsp->sync_hdr.SessionId;
1540                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1541         }
1542
1543         rc = SMB2_sess_establish_session(sess_data);
1544 out:
1545         kfree(ntlmssp_blob);
1546         SMB2_sess_free_buffer(sess_data);
1547         kfree(ses->ntlmssp);
1548         ses->ntlmssp = NULL;
1549         sess_data->result = rc;
1550         sess_data->func = NULL;
1551 }
1552
1553 static int
1554 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1555 {
1556         int type;
1557
1558         type = smb2_select_sectype(cifs_ses_server(ses), ses->sectype);
1559         cifs_dbg(FYI, "sess setup type %d\n", type);
1560         if (type == Unspecified) {
1561                 cifs_dbg(VFS,
1562                         "Unable to select appropriate authentication method!");
1563                 return -EINVAL;
1564         }
1565
1566         switch (type) {
1567         case Kerberos:
1568                 sess_data->func = SMB2_auth_kerberos;
1569                 break;
1570         case RawNTLMSSP:
1571                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1572                 break;
1573         default:
1574                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1575                 return -EOPNOTSUPP;
1576         }
1577
1578         return 0;
1579 }
1580
1581 int
1582 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1583                 const struct nls_table *nls_cp)
1584 {
1585         int rc = 0;
1586         struct TCP_Server_Info *server = cifs_ses_server(ses);
1587         struct SMB2_sess_data *sess_data;
1588
1589         cifs_dbg(FYI, "Session Setup\n");
1590
1591         if (!server) {
1592                 WARN(1, "%s: server is NULL!\n", __func__);
1593                 return -EIO;
1594         }
1595
1596         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1597         if (!sess_data)
1598                 return -ENOMEM;
1599
1600         rc = SMB2_select_sec(ses, sess_data);
1601         if (rc)
1602                 goto out;
1603         sess_data->xid = xid;
1604         sess_data->ses = ses;
1605         sess_data->buf0_type = CIFS_NO_BUFFER;
1606         sess_data->nls_cp = (struct nls_table *) nls_cp;
1607         sess_data->previous_session = ses->Suid;
1608
1609         /*
1610          * Initialize the session hash with the server one.
1611          */
1612         memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1613                SMB2_PREAUTH_HASH_SIZE);
1614
1615         while (sess_data->func)
1616                 sess_data->func(sess_data);
1617
1618         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1619                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1620         rc = sess_data->result;
1621 out:
1622         kfree(sess_data);
1623         return rc;
1624 }
1625
1626 int
1627 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1628 {
1629         struct smb_rqst rqst;
1630         struct smb2_logoff_req *req; /* response is also trivial struct */
1631         int rc = 0;
1632         struct TCP_Server_Info *server;
1633         int flags = 0;
1634         unsigned int total_len;
1635         struct kvec iov[1];
1636         struct kvec rsp_iov;
1637         int resp_buf_type;
1638
1639         cifs_dbg(FYI, "disconnect session %p\n", ses);
1640
1641         if (ses && (ses->server))
1642                 server = ses->server;
1643         else
1644                 return -EIO;
1645
1646         /* no need to send SMB logoff if uid already closed due to reconnect */
1647         if (ses->need_reconnect)
1648                 goto smb2_session_already_dead;
1649
1650         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1651         if (rc)
1652                 return rc;
1653
1654          /* since no tcon, smb2_init can not do this, so do here */
1655         req->sync_hdr.SessionId = ses->Suid;
1656
1657         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1658                 flags |= CIFS_TRANSFORM_REQ;
1659         else if (server->sign)
1660                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1661
1662         flags |= CIFS_NO_RSP_BUF;
1663
1664         iov[0].iov_base = (char *)req;
1665         iov[0].iov_len = total_len;
1666
1667         memset(&rqst, 0, sizeof(struct smb_rqst));
1668         rqst.rq_iov = iov;
1669         rqst.rq_nvec = 1;
1670
1671         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1672         cifs_small_buf_release(req);
1673         /*
1674          * No tcon so can't do
1675          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1676          */
1677
1678 smb2_session_already_dead:
1679         return rc;
1680 }
1681
1682 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1683 {
1684         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1685 }
1686
1687 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1688
1689 /* These are similar values to what Windows uses */
1690 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1691 {
1692         tcon->max_chunks = 256;
1693         tcon->max_bytes_chunk = 1048576;
1694         tcon->max_bytes_copy = 16777216;
1695 }
1696
1697 int
1698 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1699           struct cifs_tcon *tcon, const struct nls_table *cp)
1700 {
1701         struct smb_rqst rqst;
1702         struct smb2_tree_connect_req *req;
1703         struct smb2_tree_connect_rsp *rsp = NULL;
1704         struct kvec iov[2];
1705         struct kvec rsp_iov = { NULL, 0 };
1706         int rc = 0;
1707         int resp_buftype;
1708         int unc_path_len;
1709         __le16 *unc_path = NULL;
1710         int flags = 0;
1711         unsigned int total_len;
1712         struct TCP_Server_Info *server = ses->server;
1713
1714         cifs_dbg(FYI, "TCON\n");
1715
1716         if (!server || !tree)
1717                 return -EIO;
1718
1719         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1720         if (unc_path == NULL)
1721                 return -ENOMEM;
1722
1723         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1724         unc_path_len *= 2;
1725         if (unc_path_len < 2) {
1726                 kfree(unc_path);
1727                 return -EINVAL;
1728         }
1729
1730         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1731         tcon->tid = 0;
1732         atomic_set(&tcon->num_remote_opens, 0);
1733         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1734                              &total_len);
1735         if (rc) {
1736                 kfree(unc_path);
1737                 return rc;
1738         }
1739
1740         if (smb3_encryption_required(tcon))
1741                 flags |= CIFS_TRANSFORM_REQ;
1742
1743         iov[0].iov_base = (char *)req;
1744         /* 1 for pad */
1745         iov[0].iov_len = total_len - 1;
1746
1747         /* Testing shows that buffer offset must be at location of Buffer[0] */
1748         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1749                         - 1 /* pad */);
1750         req->PathLength = cpu_to_le16(unc_path_len - 2);
1751         iov[1].iov_base = unc_path;
1752         iov[1].iov_len = unc_path_len;
1753
1754         /*
1755          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1756          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1757          * (Samba servers don't always set the flag so also check if null user)
1758          */
1759         if ((server->dialect == SMB311_PROT_ID) &&
1760             !smb3_encryption_required(tcon) &&
1761             !(ses->session_flags &
1762                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1763             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1764                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1765
1766         memset(&rqst, 0, sizeof(struct smb_rqst));
1767         rqst.rq_iov = iov;
1768         rqst.rq_nvec = 2;
1769
1770         /* Need 64 for max size write so ask for more in case not there yet */
1771         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1772
1773         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1774         cifs_small_buf_release(req);
1775         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1776         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1777         if (rc != 0) {
1778                 if (tcon) {
1779                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1780                         tcon->need_reconnect = true;
1781                 }
1782                 goto tcon_error_exit;
1783         }
1784
1785         switch (rsp->ShareType) {
1786         case SMB2_SHARE_TYPE_DISK:
1787                 cifs_dbg(FYI, "connection to disk share\n");
1788                 break;
1789         case SMB2_SHARE_TYPE_PIPE:
1790                 tcon->pipe = true;
1791                 cifs_dbg(FYI, "connection to pipe share\n");
1792                 break;
1793         case SMB2_SHARE_TYPE_PRINT:
1794                 tcon->print = true;
1795                 cifs_dbg(FYI, "connection to printer\n");
1796                 break;
1797         default:
1798                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1799                 rc = -EOPNOTSUPP;
1800                 goto tcon_error_exit;
1801         }
1802
1803         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1804         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1805         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1806         tcon->tidStatus = CifsGood;
1807         tcon->need_reconnect = false;
1808         tcon->tid = rsp->sync_hdr.TreeId;
1809         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1810
1811         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1812             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1813                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1814
1815         if (tcon->seal &&
1816             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1817                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1818
1819         init_copy_chunk_defaults(tcon);
1820         if (server->ops->validate_negotiate)
1821                 rc = server->ops->validate_negotiate(xid, tcon);
1822 tcon_exit:
1823
1824         free_rsp_buf(resp_buftype, rsp);
1825         kfree(unc_path);
1826         return rc;
1827
1828 tcon_error_exit:
1829         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1830                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1831         }
1832         goto tcon_exit;
1833 }
1834
1835 int
1836 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1837 {
1838         struct smb_rqst rqst;
1839         struct smb2_tree_disconnect_req *req; /* response is trivial */
1840         int rc = 0;
1841         struct cifs_ses *ses = tcon->ses;
1842         int flags = 0;
1843         unsigned int total_len;
1844         struct kvec iov[1];
1845         struct kvec rsp_iov;
1846         int resp_buf_type;
1847
1848         cifs_dbg(FYI, "Tree Disconnect\n");
1849
1850         if (!ses || !(ses->server))
1851                 return -EIO;
1852
1853         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1854                 return 0;
1855
1856         close_shroot_lease(&tcon->crfid);
1857
1858         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1859                              &total_len);
1860         if (rc)
1861                 return rc;
1862
1863         if (smb3_encryption_required(tcon))
1864                 flags |= CIFS_TRANSFORM_REQ;
1865
1866         flags |= CIFS_NO_RSP_BUF;
1867
1868         iov[0].iov_base = (char *)req;
1869         iov[0].iov_len = total_len;
1870
1871         memset(&rqst, 0, sizeof(struct smb_rqst));
1872         rqst.rq_iov = iov;
1873         rqst.rq_nvec = 1;
1874
1875         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1876         cifs_small_buf_release(req);
1877         if (rc)
1878                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1879
1880         return rc;
1881 }
1882
1883
1884 static struct create_durable *
1885 create_durable_buf(void)
1886 {
1887         struct create_durable *buf;
1888
1889         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1890         if (!buf)
1891                 return NULL;
1892
1893         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1894                                         (struct create_durable, Data));
1895         buf->ccontext.DataLength = cpu_to_le32(16);
1896         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1897                                 (struct create_durable, Name));
1898         buf->ccontext.NameLength = cpu_to_le16(4);
1899         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1900         buf->Name[0] = 'D';
1901         buf->Name[1] = 'H';
1902         buf->Name[2] = 'n';
1903         buf->Name[3] = 'Q';
1904         return buf;
1905 }
1906
1907 static struct create_durable *
1908 create_reconnect_durable_buf(struct cifs_fid *fid)
1909 {
1910         struct create_durable *buf;
1911
1912         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1913         if (!buf)
1914                 return NULL;
1915
1916         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1917                                         (struct create_durable, Data));
1918         buf->ccontext.DataLength = cpu_to_le32(16);
1919         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1920                                 (struct create_durable, Name));
1921         buf->ccontext.NameLength = cpu_to_le16(4);
1922         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1923         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1924         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1925         buf->Name[0] = 'D';
1926         buf->Name[1] = 'H';
1927         buf->Name[2] = 'n';
1928         buf->Name[3] = 'C';
1929         return buf;
1930 }
1931
1932 static void
1933 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
1934 {
1935         struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
1936
1937         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
1938                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
1939         buf->IndexNumber = pdisk_id->DiskFileId;
1940 }
1941
1942 void
1943 smb2_parse_contexts(struct TCP_Server_Info *server,
1944                        struct smb2_create_rsp *rsp,
1945                        unsigned int *epoch, char *lease_key, __u8 *oplock,
1946                        struct smb2_file_all_info *buf)
1947 {
1948         char *data_offset;
1949         struct create_context *cc;
1950         unsigned int next;
1951         unsigned int remaining;
1952         char *name;
1953
1954         *oplock = 0;
1955         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1956         remaining = le32_to_cpu(rsp->CreateContextsLength);
1957         cc = (struct create_context *)data_offset;
1958
1959         /* Initialize inode number to 0 in case no valid data in qfid context */
1960         if (buf)
1961                 buf->IndexNumber = 0;
1962
1963         while (remaining >= sizeof(struct create_context)) {
1964                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1965                 if (le16_to_cpu(cc->NameLength) == 4 &&
1966                     strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
1967                         *oplock = server->ops->parse_lease_buf(cc, epoch,
1968                                                            lease_key);
1969                 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
1970                     strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
1971                         parse_query_id_ctxt(cc, buf);
1972
1973                 next = le32_to_cpu(cc->Next);
1974                 if (!next)
1975                         break;
1976                 remaining -= next;
1977                 cc = (struct create_context *)((char *)cc + next);
1978         }
1979
1980         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
1981                 *oplock = rsp->OplockLevel;
1982
1983         return;
1984 }
1985
1986 static int
1987 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1988                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1989 {
1990         struct smb2_create_req *req = iov[0].iov_base;
1991         unsigned int num = *num_iovec;
1992
1993         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1994         if (iov[num].iov_base == NULL)
1995                 return -ENOMEM;
1996         iov[num].iov_len = server->vals->create_lease_size;
1997         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1998         if (!req->CreateContextsOffset)
1999                 req->CreateContextsOffset = cpu_to_le32(
2000                                 sizeof(struct smb2_create_req) +
2001                                 iov[num - 1].iov_len);
2002         le32_add_cpu(&req->CreateContextsLength,
2003                      server->vals->create_lease_size);
2004         *num_iovec = num + 1;
2005         return 0;
2006 }
2007
2008 static struct create_durable_v2 *
2009 create_durable_v2_buf(struct cifs_open_parms *oparms)
2010 {
2011         struct cifs_fid *pfid = oparms->fid;
2012         struct create_durable_v2 *buf;
2013
2014         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2015         if (!buf)
2016                 return NULL;
2017
2018         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2019                                         (struct create_durable_v2, dcontext));
2020         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2021         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2022                                 (struct create_durable_v2, Name));
2023         buf->ccontext.NameLength = cpu_to_le16(4);
2024
2025         /*
2026          * NB: Handle timeout defaults to 0, which allows server to choose
2027          * (most servers default to 120 seconds) and most clients default to 0.
2028          * This can be overridden at mount ("handletimeout=") if the user wants
2029          * a different persistent (or resilient) handle timeout for all opens
2030          * opens on a particular SMB3 mount.
2031          */
2032         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2033         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2034         generate_random_uuid(buf->dcontext.CreateGuid);
2035         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2036
2037         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2038         buf->Name[0] = 'D';
2039         buf->Name[1] = 'H';
2040         buf->Name[2] = '2';
2041         buf->Name[3] = 'Q';
2042         return buf;
2043 }
2044
2045 static struct create_durable_handle_reconnect_v2 *
2046 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2047 {
2048         struct create_durable_handle_reconnect_v2 *buf;
2049
2050         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2051                         GFP_KERNEL);
2052         if (!buf)
2053                 return NULL;
2054
2055         buf->ccontext.DataOffset =
2056                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2057                                      dcontext));
2058         buf->ccontext.DataLength =
2059                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2060         buf->ccontext.NameOffset =
2061                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2062                             Name));
2063         buf->ccontext.NameLength = cpu_to_le16(4);
2064
2065         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2066         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2067         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2068         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2069
2070         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2071         buf->Name[0] = 'D';
2072         buf->Name[1] = 'H';
2073         buf->Name[2] = '2';
2074         buf->Name[3] = 'C';
2075         return buf;
2076 }
2077
2078 static int
2079 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2080                     struct cifs_open_parms *oparms)
2081 {
2082         struct smb2_create_req *req = iov[0].iov_base;
2083         unsigned int num = *num_iovec;
2084
2085         iov[num].iov_base = create_durable_v2_buf(oparms);
2086         if (iov[num].iov_base == NULL)
2087                 return -ENOMEM;
2088         iov[num].iov_len = sizeof(struct create_durable_v2);
2089         if (!req->CreateContextsOffset)
2090                 req->CreateContextsOffset =
2091                         cpu_to_le32(sizeof(struct smb2_create_req) +
2092                                                                 iov[1].iov_len);
2093         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2094         *num_iovec = num + 1;
2095         return 0;
2096 }
2097
2098 static int
2099 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2100                     struct cifs_open_parms *oparms)
2101 {
2102         struct smb2_create_req *req = iov[0].iov_base;
2103         unsigned int num = *num_iovec;
2104
2105         /* indicate that we don't need to relock the file */
2106         oparms->reconnect = false;
2107
2108         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2109         if (iov[num].iov_base == NULL)
2110                 return -ENOMEM;
2111         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2112         if (!req->CreateContextsOffset)
2113                 req->CreateContextsOffset =
2114                         cpu_to_le32(sizeof(struct smb2_create_req) +
2115                                                                 iov[1].iov_len);
2116         le32_add_cpu(&req->CreateContextsLength,
2117                         sizeof(struct create_durable_handle_reconnect_v2));
2118         *num_iovec = num + 1;
2119         return 0;
2120 }
2121
2122 static int
2123 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2124                     struct cifs_open_parms *oparms, bool use_persistent)
2125 {
2126         struct smb2_create_req *req = iov[0].iov_base;
2127         unsigned int num = *num_iovec;
2128
2129         if (use_persistent) {
2130                 if (oparms->reconnect)
2131                         return add_durable_reconnect_v2_context(iov, num_iovec,
2132                                                                 oparms);
2133                 else
2134                         return add_durable_v2_context(iov, num_iovec, oparms);
2135         }
2136
2137         if (oparms->reconnect) {
2138                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2139                 /* indicate that we don't need to relock the file */
2140                 oparms->reconnect = false;
2141         } else
2142                 iov[num].iov_base = create_durable_buf();
2143         if (iov[num].iov_base == NULL)
2144                 return -ENOMEM;
2145         iov[num].iov_len = sizeof(struct create_durable);
2146         if (!req->CreateContextsOffset)
2147                 req->CreateContextsOffset =
2148                         cpu_to_le32(sizeof(struct smb2_create_req) +
2149                                                                 iov[1].iov_len);
2150         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2151         *num_iovec = num + 1;
2152         return 0;
2153 }
2154
2155 /* See MS-SMB2 2.2.13.2.7 */
2156 static struct crt_twarp_ctxt *
2157 create_twarp_buf(__u64 timewarp)
2158 {
2159         struct crt_twarp_ctxt *buf;
2160
2161         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2162         if (!buf)
2163                 return NULL;
2164
2165         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2166                                         (struct crt_twarp_ctxt, Timestamp));
2167         buf->ccontext.DataLength = cpu_to_le32(8);
2168         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2169                                 (struct crt_twarp_ctxt, Name));
2170         buf->ccontext.NameLength = cpu_to_le16(4);
2171         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2172         buf->Name[0] = 'T';
2173         buf->Name[1] = 'W';
2174         buf->Name[2] = 'r';
2175         buf->Name[3] = 'p';
2176         buf->Timestamp = cpu_to_le64(timewarp);
2177         return buf;
2178 }
2179
2180 /* See MS-SMB2 2.2.13.2.7 */
2181 static int
2182 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2183 {
2184         struct smb2_create_req *req = iov[0].iov_base;
2185         unsigned int num = *num_iovec;
2186
2187         iov[num].iov_base = create_twarp_buf(timewarp);
2188         if (iov[num].iov_base == NULL)
2189                 return -ENOMEM;
2190         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2191         if (!req->CreateContextsOffset)
2192                 req->CreateContextsOffset = cpu_to_le32(
2193                                 sizeof(struct smb2_create_req) +
2194                                 iov[num - 1].iov_len);
2195         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2196         *num_iovec = num + 1;
2197         return 0;
2198 }
2199
2200 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2201 static struct crt_sd_ctxt *
2202 create_sd_buf(umode_t mode, unsigned int *len)
2203 {
2204         struct crt_sd_ctxt *buf;
2205         struct cifs_ace *pace;
2206         unsigned int sdlen, acelen;
2207
2208         *len = roundup(sizeof(struct crt_sd_ctxt) + sizeof(struct cifs_ace) * 2,
2209                         8);
2210         buf = kzalloc(*len, GFP_KERNEL);
2211         if (buf == NULL)
2212                 return buf;
2213
2214         sdlen = sizeof(struct smb3_sd) + sizeof(struct smb3_acl) +
2215                  2 * sizeof(struct cifs_ace);
2216
2217         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2218                                         (struct crt_sd_ctxt, sd));
2219         buf->ccontext.DataLength = cpu_to_le32(sdlen);
2220         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2221                                 (struct crt_sd_ctxt, Name));
2222         buf->ccontext.NameLength = cpu_to_le16(4);
2223         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2224         buf->Name[0] = 'S';
2225         buf->Name[1] = 'e';
2226         buf->Name[2] = 'c';
2227         buf->Name[3] = 'D';
2228         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2229         /*
2230          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2231          * and "DP" ie the DACL is present
2232          */
2233         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2234
2235         /* offset owner, group and Sbz1 and SACL are all zero */
2236         buf->sd.OffsetDacl = cpu_to_le32(sizeof(struct smb3_sd));
2237         buf->acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2238
2239         /* create one ACE to hold the mode embedded in reserved special SID */
2240         pace = (struct cifs_ace *)(sizeof(struct crt_sd_ctxt) + (char *)buf);
2241         acelen = setup_special_mode_ACE(pace, (__u64)mode);
2242         /* and one more ACE to allow access for authenticated users */
2243         pace = (struct cifs_ace *)(acelen + (sizeof(struct crt_sd_ctxt) +
2244                 (char *)buf));
2245         acelen += setup_authusers_ACE(pace);
2246         buf->acl.AclSize = cpu_to_le16(sizeof(struct cifs_acl) + acelen);
2247         buf->acl.AceCount = cpu_to_le16(2);
2248         return buf;
2249 }
2250
2251 static int
2252 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
2253 {
2254         struct smb2_create_req *req = iov[0].iov_base;
2255         unsigned int num = *num_iovec;
2256         unsigned int len = 0;
2257
2258         iov[num].iov_base = create_sd_buf(mode, &len);
2259         if (iov[num].iov_base == NULL)
2260                 return -ENOMEM;
2261         iov[num].iov_len = len;
2262         if (!req->CreateContextsOffset)
2263                 req->CreateContextsOffset = cpu_to_le32(
2264                                 sizeof(struct smb2_create_req) +
2265                                 iov[num - 1].iov_len);
2266         le32_add_cpu(&req->CreateContextsLength, len);
2267         *num_iovec = num + 1;
2268         return 0;
2269 }
2270
2271 static struct crt_query_id_ctxt *
2272 create_query_id_buf(void)
2273 {
2274         struct crt_query_id_ctxt *buf;
2275
2276         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2277         if (!buf)
2278                 return NULL;
2279
2280         buf->ccontext.DataOffset = cpu_to_le16(0);
2281         buf->ccontext.DataLength = cpu_to_le32(0);
2282         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2283                                 (struct crt_query_id_ctxt, Name));
2284         buf->ccontext.NameLength = cpu_to_le16(4);
2285         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2286         buf->Name[0] = 'Q';
2287         buf->Name[1] = 'F';
2288         buf->Name[2] = 'i';
2289         buf->Name[3] = 'd';
2290         return buf;
2291 }
2292
2293 /* See MS-SMB2 2.2.13.2.9 */
2294 static int
2295 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2296 {
2297         struct smb2_create_req *req = iov[0].iov_base;
2298         unsigned int num = *num_iovec;
2299
2300         iov[num].iov_base = create_query_id_buf();
2301         if (iov[num].iov_base == NULL)
2302                 return -ENOMEM;
2303         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2304         if (!req->CreateContextsOffset)
2305                 req->CreateContextsOffset = cpu_to_le32(
2306                                 sizeof(struct smb2_create_req) +
2307                                 iov[num - 1].iov_len);
2308         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2309         *num_iovec = num + 1;
2310         return 0;
2311 }
2312
2313 static int
2314 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2315                             const char *treename, const __le16 *path)
2316 {
2317         int treename_len, path_len;
2318         struct nls_table *cp;
2319         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2320
2321         /*
2322          * skip leading "\\"
2323          */
2324         treename_len = strlen(treename);
2325         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2326                 return -EINVAL;
2327
2328         treename += 2;
2329         treename_len -= 2;
2330
2331         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2332
2333         /*
2334          * make room for one path separator between the treename and
2335          * path
2336          */
2337         *out_len = treename_len + 1 + path_len;
2338
2339         /*
2340          * final path needs to be null-terminated UTF16 with a
2341          * size aligned to 8
2342          */
2343
2344         *out_size = roundup((*out_len+1)*2, 8);
2345         *out_path = kzalloc(*out_size, GFP_KERNEL);
2346         if (!*out_path)
2347                 return -ENOMEM;
2348
2349         cp = load_nls_default();
2350         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2351         UniStrcat(*out_path, sep);
2352         UniStrcat(*out_path, path);
2353         unload_nls(cp);
2354
2355         return 0;
2356 }
2357
2358 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2359                                umode_t mode, struct cifs_tcon *tcon,
2360                                const char *full_path,
2361                                struct cifs_sb_info *cifs_sb)
2362 {
2363         struct smb_rqst rqst;
2364         struct smb2_create_req *req;
2365         struct smb2_create_rsp *rsp = NULL;
2366         struct cifs_ses *ses = tcon->ses;
2367         struct kvec iov[3]; /* make sure at least one for each open context */
2368         struct kvec rsp_iov = {NULL, 0};
2369         int resp_buftype;
2370         int uni_path_len;
2371         __le16 *copy_path = NULL;
2372         int copy_size;
2373         int rc = 0;
2374         unsigned int n_iov = 2;
2375         __u32 file_attributes = 0;
2376         char *pc_buf = NULL;
2377         int flags = 0;
2378         unsigned int total_len;
2379         __le16 *utf16_path = NULL;
2380
2381         cifs_dbg(FYI, "mkdir\n");
2382
2383         /* resource #1: path allocation */
2384         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2385         if (!utf16_path)
2386                 return -ENOMEM;
2387
2388         if (!ses || !(ses->server)) {
2389                 rc = -EIO;
2390                 goto err_free_path;
2391         }
2392
2393         /* resource #2: request */
2394         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2395         if (rc)
2396                 goto err_free_path;
2397
2398
2399         if (smb3_encryption_required(tcon))
2400                 flags |= CIFS_TRANSFORM_REQ;
2401
2402         req->ImpersonationLevel = IL_IMPERSONATION;
2403         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2404         /* File attributes ignored on open (used in create though) */
2405         req->FileAttributes = cpu_to_le32(file_attributes);
2406         req->ShareAccess = FILE_SHARE_ALL_LE;
2407         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2408         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2409
2410         iov[0].iov_base = (char *)req;
2411         /* -1 since last byte is buf[0] which is sent below (path) */
2412         iov[0].iov_len = total_len - 1;
2413
2414         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2415
2416         /* [MS-SMB2] 2.2.13 NameOffset:
2417          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2418          * the SMB2 header, the file name includes a prefix that will
2419          * be processed during DFS name normalization as specified in
2420          * section 3.3.5.9. Otherwise, the file name is relative to
2421          * the share that is identified by the TreeId in the SMB2
2422          * header.
2423          */
2424         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2425                 int name_len;
2426
2427                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2428                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2429                                                  &name_len,
2430                                                  tcon->treeName, utf16_path);
2431                 if (rc)
2432                         goto err_free_req;
2433
2434                 req->NameLength = cpu_to_le16(name_len * 2);
2435                 uni_path_len = copy_size;
2436                 /* free before overwriting resource */
2437                 kfree(utf16_path);
2438                 utf16_path = copy_path;
2439         } else {
2440                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2441                 /* MUST set path len (NameLength) to 0 opening root of share */
2442                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2443                 if (uni_path_len % 8 != 0) {
2444                         copy_size = roundup(uni_path_len, 8);
2445                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2446                         if (!copy_path) {
2447                                 rc = -ENOMEM;
2448                                 goto err_free_req;
2449                         }
2450                         memcpy((char *)copy_path, (const char *)utf16_path,
2451                                uni_path_len);
2452                         uni_path_len = copy_size;
2453                         /* free before overwriting resource */
2454                         kfree(utf16_path);
2455                         utf16_path = copy_path;
2456                 }
2457         }
2458
2459         iov[1].iov_len = uni_path_len;
2460         iov[1].iov_base = utf16_path;
2461         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2462
2463         if (tcon->posix_extensions) {
2464                 /* resource #3: posix buf */
2465                 rc = add_posix_context(iov, &n_iov, mode);
2466                 if (rc)
2467                         goto err_free_req;
2468                 pc_buf = iov[n_iov-1].iov_base;
2469         }
2470
2471
2472         memset(&rqst, 0, sizeof(struct smb_rqst));
2473         rqst.rq_iov = iov;
2474         rqst.rq_nvec = n_iov;
2475
2476         /* no need to inc num_remote_opens because we close it just below */
2477         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2478                                     FILE_WRITE_ATTRIBUTES);
2479         /* resource #4: response buffer */
2480         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2481         if (rc) {
2482                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2483                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2484                                            CREATE_NOT_FILE,
2485                                            FILE_WRITE_ATTRIBUTES, rc);
2486                 goto err_free_rsp_buf;
2487         }
2488
2489         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2490         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2491                                     ses->Suid, CREATE_NOT_FILE,
2492                                     FILE_WRITE_ATTRIBUTES);
2493
2494         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2495
2496         /* Eventually save off posix specific response info and timestaps */
2497
2498 err_free_rsp_buf:
2499         free_rsp_buf(resp_buftype, rsp);
2500         kfree(pc_buf);
2501 err_free_req:
2502         cifs_small_buf_release(req);
2503 err_free_path:
2504         kfree(utf16_path);
2505         return rc;
2506 }
2507
2508 int
2509 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2510                struct cifs_open_parms *oparms, __le16 *path)
2511 {
2512         struct TCP_Server_Info *server = tcon->ses->server;
2513         struct smb2_create_req *req;
2514         unsigned int n_iov = 2;
2515         __u32 file_attributes = 0;
2516         int copy_size;
2517         int uni_path_len;
2518         unsigned int total_len;
2519         struct kvec *iov = rqst->rq_iov;
2520         __le16 *copy_path;
2521         int rc;
2522
2523         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2524         if (rc)
2525                 return rc;
2526
2527         iov[0].iov_base = (char *)req;
2528         /* -1 since last byte is buf[0] which is sent below (path) */
2529         iov[0].iov_len = total_len - 1;
2530
2531         if (oparms->create_options & CREATE_OPTION_READONLY)
2532                 file_attributes |= ATTR_READONLY;
2533         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2534                 file_attributes |= ATTR_SYSTEM;
2535
2536         req->ImpersonationLevel = IL_IMPERSONATION;
2537         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2538         /* File attributes ignored on open (used in create though) */
2539         req->FileAttributes = cpu_to_le32(file_attributes);
2540         req->ShareAccess = FILE_SHARE_ALL_LE;
2541
2542         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2543         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2544         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2545
2546         /* [MS-SMB2] 2.2.13 NameOffset:
2547          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2548          * the SMB2 header, the file name includes a prefix that will
2549          * be processed during DFS name normalization as specified in
2550          * section 3.3.5.9. Otherwise, the file name is relative to
2551          * the share that is identified by the TreeId in the SMB2
2552          * header.
2553          */
2554         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2555                 int name_len;
2556
2557                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2558                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2559                                                  &name_len,
2560                                                  tcon->treeName, path);
2561                 if (rc)
2562                         return rc;
2563                 req->NameLength = cpu_to_le16(name_len * 2);
2564                 uni_path_len = copy_size;
2565                 path = copy_path;
2566         } else {
2567                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2568                 /* MUST set path len (NameLength) to 0 opening root of share */
2569                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2570                 copy_size = uni_path_len;
2571                 if (copy_size % 8 != 0)
2572                         copy_size = roundup(copy_size, 8);
2573                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2574                 if (!copy_path)
2575                         return -ENOMEM;
2576                 memcpy((char *)copy_path, (const char *)path,
2577                        uni_path_len);
2578                 uni_path_len = copy_size;
2579                 path = copy_path;
2580         }
2581
2582         iov[1].iov_len = uni_path_len;
2583         iov[1].iov_base = path;
2584
2585         if ((!server->oplocks) || (tcon->no_lease))
2586                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2587
2588         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2589             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2590                 req->RequestedOplockLevel = *oplock;
2591         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2592                   (oparms->create_options & CREATE_NOT_FILE))
2593                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2594         else {
2595                 rc = add_lease_context(server, iov, &n_iov,
2596                                        oparms->fid->lease_key, oplock);
2597                 if (rc)
2598                         return rc;
2599         }
2600
2601         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2602                 /* need to set Next field of lease context if we request it */
2603                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2604                         struct create_context *ccontext =
2605                             (struct create_context *)iov[n_iov-1].iov_base;
2606                         ccontext->Next =
2607                                 cpu_to_le32(server->vals->create_lease_size);
2608                 }
2609
2610                 rc = add_durable_context(iov, &n_iov, oparms,
2611                                         tcon->use_persistent);
2612                 if (rc)
2613                         return rc;
2614         }
2615
2616         if (tcon->posix_extensions) {
2617                 if (n_iov > 2) {
2618                         struct create_context *ccontext =
2619                             (struct create_context *)iov[n_iov-1].iov_base;
2620                         ccontext->Next =
2621                                 cpu_to_le32(iov[n_iov-1].iov_len);
2622                 }
2623
2624                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2625                 if (rc)
2626                         return rc;
2627         }
2628
2629         if (tcon->snapshot_time) {
2630                 cifs_dbg(FYI, "adding snapshot context\n");
2631                 if (n_iov > 2) {
2632                         struct create_context *ccontext =
2633                             (struct create_context *)iov[n_iov-1].iov_base;
2634                         ccontext->Next =
2635                                 cpu_to_le32(iov[n_iov-1].iov_len);
2636                 }
2637
2638                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2639                 if (rc)
2640                         return rc;
2641         }
2642
2643         if ((oparms->disposition != FILE_OPEN) &&
2644             (oparms->cifs_sb) &&
2645             (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2646             (oparms->mode != ACL_NO_MODE)) {
2647                 if (n_iov > 2) {
2648                         struct create_context *ccontext =
2649                             (struct create_context *)iov[n_iov-1].iov_base;
2650                         ccontext->Next =
2651                                 cpu_to_le32(iov[n_iov-1].iov_len);
2652                 }
2653
2654                 cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2655                 rc = add_sd_context(iov, &n_iov, oparms->mode);
2656                 if (rc)
2657                         return rc;
2658         }
2659
2660         if (n_iov > 2) {
2661                 struct create_context *ccontext =
2662                         (struct create_context *)iov[n_iov-1].iov_base;
2663                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2664         }
2665         add_query_id_context(iov, &n_iov);
2666
2667         rqst->rq_nvec = n_iov;
2668         return 0;
2669 }
2670
2671 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2672  * All other vectors are freed by kfree().
2673  */
2674 void
2675 SMB2_open_free(struct smb_rqst *rqst)
2676 {
2677         int i;
2678
2679         if (rqst && rqst->rq_iov) {
2680                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2681                 for (i = 1; i < rqst->rq_nvec; i++)
2682                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2683                                 kfree(rqst->rq_iov[i].iov_base);
2684         }
2685 }
2686
2687 int
2688 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2689           __u8 *oplock, struct smb2_file_all_info *buf,
2690           struct kvec *err_iov, int *buftype)
2691 {
2692         struct smb_rqst rqst;
2693         struct smb2_create_rsp *rsp = NULL;
2694         struct TCP_Server_Info *server;
2695         struct cifs_tcon *tcon = oparms->tcon;
2696         struct cifs_ses *ses = tcon->ses;
2697         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2698         struct kvec rsp_iov = {NULL, 0};
2699         int resp_buftype = CIFS_NO_BUFFER;
2700         int rc = 0;
2701         int flags = 0;
2702
2703         cifs_dbg(FYI, "create/open\n");
2704         if (ses && (ses->server))
2705                 server = ses->server;
2706         else
2707                 return -EIO;
2708
2709         if (smb3_encryption_required(tcon))
2710                 flags |= CIFS_TRANSFORM_REQ;
2711
2712         memset(&rqst, 0, sizeof(struct smb_rqst));
2713         memset(&iov, 0, sizeof(iov));
2714         rqst.rq_iov = iov;
2715         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2716
2717         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2718         if (rc)
2719                 goto creat_exit;
2720
2721         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2722                 oparms->create_options, oparms->desired_access);
2723
2724         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2725                             &rsp_iov);
2726         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2727
2728         if (rc != 0) {
2729                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2730                 if (err_iov && rsp) {
2731                         *err_iov = rsp_iov;
2732                         *buftype = resp_buftype;
2733                         resp_buftype = CIFS_NO_BUFFER;
2734                         rsp = NULL;
2735                 }
2736                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2737                                     oparms->create_options, oparms->desired_access, rc);
2738                 if (rc == -EREMCHG) {
2739                         printk_once(KERN_WARNING "server share %s deleted\n",
2740                                     tcon->treeName);
2741                         tcon->need_reconnect = true;
2742                 }
2743                 goto creat_exit;
2744         } else
2745                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2746                                      ses->Suid, oparms->create_options,
2747                                      oparms->desired_access);
2748
2749         atomic_inc(&tcon->num_remote_opens);
2750         oparms->fid->persistent_fid = rsp->PersistentFileId;
2751         oparms->fid->volatile_fid = rsp->VolatileFileId;
2752 #ifdef CONFIG_CIFS_DEBUG2
2753         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2754 #endif /* CIFS_DEBUG2 */
2755
2756         if (buf) {
2757                 memcpy(buf, &rsp->CreationTime, 32);
2758                 buf->AllocationSize = rsp->AllocationSize;
2759                 buf->EndOfFile = rsp->EndofFile;
2760                 buf->Attributes = rsp->FileAttributes;
2761                 buf->NumberOfLinks = cpu_to_le32(1);
2762                 buf->DeletePending = 0;
2763         }
2764
2765
2766         smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
2767                             oparms->fid->lease_key, oplock, buf);
2768 creat_exit:
2769         SMB2_open_free(&rqst);
2770         free_rsp_buf(resp_buftype, rsp);
2771         return rc;
2772 }
2773
2774 int
2775 SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2776                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2777                 bool is_fsctl, char *in_data, u32 indatalen,
2778                 __u32 max_response_size)
2779 {
2780         struct smb2_ioctl_req *req;
2781         struct kvec *iov = rqst->rq_iov;
2782         unsigned int total_len;
2783         int rc;
2784         char *in_data_buf;
2785
2786         rc = smb2_ioctl_req_init(opcode, tcon, (void **) &req, &total_len);
2787         if (rc)
2788                 return rc;
2789
2790         if (indatalen) {
2791                 /*
2792                  * indatalen is usually small at a couple of bytes max, so
2793                  * just allocate through generic pool
2794                  */
2795                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
2796                 if (!in_data_buf) {
2797                         cifs_small_buf_release(req);
2798                         return -ENOMEM;
2799                 }
2800         }
2801
2802         req->CtlCode = cpu_to_le32(opcode);
2803         req->PersistentFileId = persistent_fid;
2804         req->VolatileFileId = volatile_fid;
2805
2806         iov[0].iov_base = (char *)req;
2807         /*
2808          * If no input data, the size of ioctl struct in
2809          * protocol spec still includes a 1 byte data buffer,
2810          * but if input data passed to ioctl, we do not
2811          * want to double count this, so we do not send
2812          * the dummy one byte of data in iovec[0] if sending
2813          * input data (in iovec[1]).
2814          */
2815         if (indatalen) {
2816                 req->InputCount = cpu_to_le32(indatalen);
2817                 /* do not set InputOffset if no input data */
2818                 req->InputOffset =
2819                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2820                 rqst->rq_nvec = 2;
2821                 iov[0].iov_len = total_len - 1;
2822                 iov[1].iov_base = in_data_buf;
2823                 iov[1].iov_len = indatalen;
2824         } else {
2825                 rqst->rq_nvec = 1;
2826                 iov[0].iov_len = total_len;
2827         }
2828
2829         req->OutputOffset = 0;
2830         req->OutputCount = 0; /* MBZ */
2831
2832         /*
2833          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
2834          * We Could increase default MaxOutputResponse, but that could require
2835          * more credits. Windows typically sets this smaller, but for some
2836          * ioctls it may be useful to allow server to send more. No point
2837          * limiting what the server can send as long as fits in one credit
2838          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
2839          * to increase this limit up in the future.
2840          * Note that for snapshot queries that servers like Azure expect that
2841          * the first query be minimal size (and just used to get the number/size
2842          * of previous versions) so response size must be specified as EXACTLY
2843          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2844          * of eight bytes.  Currently that is the only case where we set max
2845          * response size smaller.
2846          */
2847         req->MaxOutputResponse = cpu_to_le32(max_response_size);
2848
2849         if (is_fsctl)
2850                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2851         else
2852                 req->Flags = 0;
2853
2854         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2855         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2856                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2857
2858         return 0;
2859 }
2860
2861 void
2862 SMB2_ioctl_free(struct smb_rqst *rqst)
2863 {
2864         int i;
2865         if (rqst && rqst->rq_iov) {
2866                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2867                 for (i = 1; i < rqst->rq_nvec; i++)
2868                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2869                                 kfree(rqst->rq_iov[i].iov_base);
2870         }
2871 }
2872
2873
2874 /*
2875  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2876  */
2877 int
2878 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2879            u64 volatile_fid, u32 opcode, bool is_fsctl,
2880            char *in_data, u32 indatalen, u32 max_out_data_len,
2881            char **out_data, u32 *plen /* returned data len */)
2882 {
2883         struct smb_rqst rqst;
2884         struct smb2_ioctl_rsp *rsp = NULL;
2885         struct cifs_ses *ses;
2886         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
2887         struct kvec rsp_iov = {NULL, 0};
2888         int resp_buftype = CIFS_NO_BUFFER;
2889         int rc = 0;
2890         int flags = 0;
2891         struct TCP_Server_Info *server;
2892
2893         cifs_dbg(FYI, "SMB2 IOCTL\n");
2894
2895         if (out_data != NULL)
2896                 *out_data = NULL;
2897
2898         /* zero out returned data len, in case of error */
2899         if (plen)
2900                 *plen = 0;
2901
2902         if (tcon)
2903                 ses = tcon->ses;
2904         else
2905                 return -EIO;
2906
2907         if (!ses)
2908                 return -EIO;
2909         server = ses->server;
2910         if (!server)
2911                 return -EIO;
2912
2913         if (smb3_encryption_required(tcon))
2914                 flags |= CIFS_TRANSFORM_REQ;
2915
2916         memset(&rqst, 0, sizeof(struct smb_rqst));
2917         memset(&iov, 0, sizeof(iov));
2918         rqst.rq_iov = iov;
2919         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
2920
2921         rc = SMB2_ioctl_init(tcon, &rqst, persistent_fid, volatile_fid, opcode,
2922                              is_fsctl, in_data, indatalen, max_out_data_len);
2923         if (rc)
2924                 goto ioctl_exit;
2925
2926         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2927                             &rsp_iov);
2928         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2929
2930         if (rc != 0)
2931                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2932                                 ses->Suid, 0, opcode, rc);
2933
2934         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
2935                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2936                 goto ioctl_exit;
2937         } else if (rc == -EINVAL) {
2938                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2939                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2940                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2941                         goto ioctl_exit;
2942                 }
2943         } else if (rc == -E2BIG) {
2944                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
2945                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2946                         goto ioctl_exit;
2947                 }
2948         }
2949
2950         /* check if caller wants to look at return data or just return rc */
2951         if ((plen == NULL) || (out_data == NULL))
2952                 goto ioctl_exit;
2953
2954         *plen = le32_to_cpu(rsp->OutputCount);
2955
2956         /* We check for obvious errors in the output buffer length and offset */
2957         if (*plen == 0)
2958                 goto ioctl_exit; /* server returned no data */
2959         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
2960                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2961                 *plen = 0;
2962                 rc = -EIO;
2963                 goto ioctl_exit;
2964         }
2965
2966         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
2967                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2968                         le32_to_cpu(rsp->OutputOffset));
2969                 *plen = 0;
2970                 rc = -EIO;
2971                 goto ioctl_exit;
2972         }
2973
2974         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
2975                             *plen, GFP_KERNEL);
2976         if (*out_data == NULL) {
2977                 rc = -ENOMEM;
2978                 goto ioctl_exit;
2979         }
2980
2981 ioctl_exit:
2982         SMB2_ioctl_free(&rqst);
2983         free_rsp_buf(resp_buftype, rsp);
2984         return rc;
2985 }
2986
2987 /*
2988  *   Individual callers to ioctl worker function follow
2989  */
2990
2991 int
2992 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2993                      u64 persistent_fid, u64 volatile_fid)
2994 {
2995         int rc;
2996         struct  compress_ioctl fsctl_input;
2997         char *ret_data = NULL;
2998
2999         fsctl_input.CompressionState =
3000                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3001
3002         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3003                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
3004                         (char *)&fsctl_input /* data input */,
3005                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3006                         &ret_data /* out data */, NULL);
3007
3008         cifs_dbg(FYI, "set compression rc %d\n", rc);
3009
3010         return rc;
3011 }
3012
3013 int
3014 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
3015                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3016 {
3017         struct smb2_close_req *req;
3018         struct kvec *iov = rqst->rq_iov;
3019         unsigned int total_len;
3020         int rc;
3021
3022         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
3023         if (rc)
3024                 return rc;
3025
3026         req->PersistentFileId = persistent_fid;
3027         req->VolatileFileId = volatile_fid;
3028         if (query_attrs)
3029                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3030         else
3031                 req->Flags = 0;
3032         iov[0].iov_base = (char *)req;
3033         iov[0].iov_len = total_len;
3034
3035         return 0;
3036 }
3037
3038 void
3039 SMB2_close_free(struct smb_rqst *rqst)
3040 {
3041         if (rqst && rqst->rq_iov)
3042                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3043 }
3044
3045 int
3046 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3047              u64 persistent_fid, u64 volatile_fid,
3048              struct smb2_file_network_open_info *pbuf)
3049 {
3050         struct smb_rqst rqst;
3051         struct smb2_close_rsp *rsp = NULL;
3052         struct cifs_ses *ses = tcon->ses;
3053         struct kvec iov[1];
3054         struct kvec rsp_iov;
3055         int resp_buftype = CIFS_NO_BUFFER;
3056         int rc = 0;
3057         int flags = 0;
3058         bool query_attrs = false;
3059
3060         cifs_dbg(FYI, "Close\n");
3061
3062         if (!ses || !(ses->server))
3063                 return -EIO;
3064
3065         if (smb3_encryption_required(tcon))
3066                 flags |= CIFS_TRANSFORM_REQ;
3067
3068         memset(&rqst, 0, sizeof(struct smb_rqst));
3069         memset(&iov, 0, sizeof(iov));
3070         rqst.rq_iov = iov;
3071         rqst.rq_nvec = 1;
3072
3073         /* check if need to ask server to return timestamps in close response */
3074         if (pbuf)
3075                 query_attrs = true;
3076
3077         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3078         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid,
3079                              query_attrs);
3080         if (rc)
3081                 goto close_exit;
3082
3083         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3084         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3085
3086         if (rc != 0) {
3087                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3088                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3089                                      rc);
3090                 goto close_exit;
3091         } else {
3092                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3093                                       ses->Suid);
3094                 /*
3095                  * Note that have to subtract 4 since struct network_open_info
3096                  * has a final 4 byte pad that close response does not have
3097                  */
3098                 if (pbuf)
3099                         memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3100         }
3101
3102         atomic_dec(&tcon->num_remote_opens);
3103 close_exit:
3104         SMB2_close_free(&rqst);
3105         free_rsp_buf(resp_buftype, rsp);
3106
3107         /* retry close in a worker thread if this one is interrupted */
3108         if (rc == -EINTR) {
3109                 int tmp_rc;
3110
3111                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3112                                                      volatile_fid);
3113                 if (tmp_rc)
3114                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3115                                  persistent_fid, tmp_rc);
3116         }
3117         return rc;
3118 }
3119
3120 int
3121 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3122                 u64 persistent_fid, u64 volatile_fid)
3123 {
3124         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3125 }
3126
3127 int
3128 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3129                   struct kvec *iov, unsigned int min_buf_size)
3130 {
3131         unsigned int smb_len = iov->iov_len;
3132         char *end_of_smb = smb_len + (char *)iov->iov_base;
3133         char *begin_of_buf = offset + (char *)iov->iov_base;
3134         char *end_of_buf = begin_of_buf + buffer_length;
3135
3136
3137         if (buffer_length < min_buf_size) {
3138                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3139                          buffer_length, min_buf_size);
3140                 return -EINVAL;
3141         }
3142
3143         /* check if beyond RFC1001 maximum length */
3144         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3145                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3146                          buffer_length, smb_len);
3147                 return -EINVAL;
3148         }
3149
3150         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3151                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
3152                 return -EINVAL;
3153         }
3154
3155         return 0;
3156 }
3157
3158 /*
3159  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3160  * Caller must free buffer.
3161  */
3162 int
3163 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3164                            struct kvec *iov, unsigned int minbufsize,
3165                            char *data)
3166 {
3167         char *begin_of_buf = offset + (char *)iov->iov_base;
3168         int rc;
3169
3170         if (!data)
3171                 return -EINVAL;
3172
3173         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3174         if (rc)
3175                 return rc;
3176
3177         memcpy(data, begin_of_buf, buffer_length);
3178
3179         return 0;
3180 }
3181
3182 int
3183 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
3184                      u64 persistent_fid, u64 volatile_fid,
3185                      u8 info_class, u8 info_type, u32 additional_info,
3186                      size_t output_len, size_t input_len, void *input)
3187 {
3188         struct smb2_query_info_req *req;
3189         struct kvec *iov = rqst->rq_iov;
3190         unsigned int total_len;
3191         int rc;
3192
3193         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
3194                              &total_len);
3195         if (rc)
3196                 return rc;
3197
3198         req->InfoType = info_type;
3199         req->FileInfoClass = info_class;
3200         req->PersistentFileId = persistent_fid;
3201         req->VolatileFileId = volatile_fid;
3202         req->AdditionalInformation = cpu_to_le32(additional_info);
3203
3204         req->OutputBufferLength = cpu_to_le32(output_len);
3205         if (input_len) {
3206                 req->InputBufferLength = cpu_to_le32(input_len);
3207                 /* total_len for smb query request never close to le16 max */
3208                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3209                 memcpy(req->Buffer, input, input_len);
3210         }
3211
3212         iov[0].iov_base = (char *)req;
3213         /* 1 for Buffer */
3214         iov[0].iov_len = total_len - 1 + input_len;
3215         return 0;
3216 }
3217
3218 void
3219 SMB2_query_info_free(struct smb_rqst *rqst)
3220 {
3221         if (rqst && rqst->rq_iov)
3222                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3223 }
3224
3225 static int
3226 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3227            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3228            u32 additional_info, size_t output_len, size_t min_len, void **data,
3229                 u32 *dlen)
3230 {
3231         struct smb_rqst rqst;
3232         struct smb2_query_info_rsp *rsp = NULL;
3233         struct kvec iov[1];
3234         struct kvec rsp_iov;
3235         int rc = 0;
3236         int resp_buftype = CIFS_NO_BUFFER;
3237         struct cifs_ses *ses = tcon->ses;
3238         struct TCP_Server_Info *server;
3239         int flags = 0;
3240         bool allocated = false;
3241
3242         cifs_dbg(FYI, "Query Info\n");
3243
3244         if (!ses)
3245                 return -EIO;
3246         server = ses->server;
3247         if (!server)
3248                 return -EIO;
3249
3250         if (smb3_encryption_required(tcon))
3251                 flags |= CIFS_TRANSFORM_REQ;
3252
3253         memset(&rqst, 0, sizeof(struct smb_rqst));
3254         memset(&iov, 0, sizeof(iov));
3255         rqst.rq_iov = iov;
3256         rqst.rq_nvec = 1;
3257
3258         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
3259                                   info_class, info_type, additional_info,
3260                                   output_len, 0, NULL);
3261         if (rc)
3262                 goto qinf_exit;
3263
3264         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3265                                     ses->Suid, info_class, (__u32)info_type);
3266
3267         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3268         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3269
3270         if (rc) {
3271                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3272                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3273                                 ses->Suid, info_class, (__u32)info_type, rc);
3274                 goto qinf_exit;
3275         }
3276
3277         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3278                                 ses->Suid, info_class, (__u32)info_type);
3279
3280         if (dlen) {
3281                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3282                 if (!*data) {
3283                         *data = kmalloc(*dlen, GFP_KERNEL);
3284                         if (!*data) {
3285                                 cifs_tcon_dbg(VFS,
3286                                         "Error %d allocating memory for acl\n",
3287                                         rc);
3288                                 *dlen = 0;
3289                                 rc = -ENOMEM;
3290                                 goto qinf_exit;
3291                         }
3292                         allocated = true;
3293                 }
3294         }
3295
3296         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3297                                         le32_to_cpu(rsp->OutputBufferLength),
3298                                         &rsp_iov, min_len, *data);
3299         if (rc && allocated) {
3300                 kfree(*data);
3301                 *data = NULL;
3302                 *dlen = 0;
3303         }
3304
3305 qinf_exit:
3306         SMB2_query_info_free(&rqst);
3307         free_rsp_buf(resp_buftype, rsp);
3308         return rc;
3309 }
3310
3311 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3312         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3313 {
3314         return query_info(xid, tcon, persistent_fid, volatile_fid,
3315                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3316                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3317                           sizeof(struct smb2_file_all_info), (void **)&data,
3318                           NULL);
3319 }
3320
3321 int
3322 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3323                 u64 persistent_fid, u64 volatile_fid,
3324                 void **data, u32 *plen)
3325 {
3326         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
3327         *plen = 0;
3328
3329         return query_info(xid, tcon, persistent_fid, volatile_fid,
3330                           0, SMB2_O_INFO_SECURITY, additional_info,
3331                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3332 }
3333
3334 int
3335 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3336                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3337 {
3338         return query_info(xid, tcon, persistent_fid, volatile_fid,
3339                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3340                           sizeof(struct smb2_file_internal_info),
3341                           sizeof(struct smb2_file_internal_info),
3342                           (void **)&uniqueid, NULL);
3343 }
3344
3345 /*
3346  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3347  * See MS-SMB2 2.2.35 and 2.2.36
3348  */
3349
3350 static int
3351 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3352                 struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid,
3353                 u32 completion_filter, bool watch_tree)
3354 {
3355         struct smb2_change_notify_req *req;
3356         struct kvec *iov = rqst->rq_iov;
3357         unsigned int total_len;
3358         int rc;
3359
3360         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, (void **) &req, &total_len);
3361         if (rc)
3362                 return rc;
3363
3364         req->PersistentFileId = persistent_fid;
3365         req->VolatileFileId = volatile_fid;
3366         req->OutputBufferLength =
3367                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3368         req->CompletionFilter = cpu_to_le32(completion_filter);
3369         if (watch_tree)
3370                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3371         else
3372                 req->Flags = 0;
3373
3374         iov[0].iov_base = (char *)req;
3375         iov[0].iov_len = total_len;
3376
3377         return 0;
3378 }
3379
3380 int
3381 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3382                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3383                 u32 completion_filter)
3384 {
3385         struct cifs_ses *ses = tcon->ses;
3386         struct smb_rqst rqst;
3387         struct kvec iov[1];
3388         struct kvec rsp_iov = {NULL, 0};
3389         int resp_buftype = CIFS_NO_BUFFER;
3390         int flags = 0;
3391         int rc = 0;
3392
3393         cifs_dbg(FYI, "change notify\n");
3394         if (!ses || !(ses->server))
3395                 return -EIO;
3396
3397         if (smb3_encryption_required(tcon))
3398                 flags |= CIFS_TRANSFORM_REQ;
3399
3400         memset(&rqst, 0, sizeof(struct smb_rqst));
3401         memset(&iov, 0, sizeof(iov));
3402         rqst.rq_iov = iov;
3403         rqst.rq_nvec = 1;
3404
3405         rc = SMB2_notify_init(xid, &rqst, tcon, persistent_fid, volatile_fid,
3406                               completion_filter, watch_tree);
3407         if (rc)
3408                 goto cnotify_exit;
3409
3410         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3411                                 (u8)watch_tree, completion_filter);
3412         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3413
3414         if (rc != 0) {
3415                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3416                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3417                                 (u8)watch_tree, completion_filter, rc);
3418         } else
3419                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3420                                 ses->Suid, (u8)watch_tree, completion_filter);
3421
3422  cnotify_exit:
3423         if (rqst.rq_iov)
3424                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3425         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3426         return rc;
3427 }
3428
3429
3430
3431 /*
3432  * This is a no-op for now. We're not really interested in the reply, but
3433  * rather in the fact that the server sent one and that server->lstrp
3434  * gets updated.
3435  *
3436  * FIXME: maybe we should consider checking that the reply matches request?
3437  */
3438 static void
3439 smb2_echo_callback(struct mid_q_entry *mid)
3440 {
3441         struct TCP_Server_Info *server = mid->callback_data;
3442         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3443         struct cifs_credits credits = { .value = 0, .instance = 0 };
3444
3445         if (mid->mid_state == MID_RESPONSE_RECEIVED
3446             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3447                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3448                 credits.instance = server->reconnect_instance;
3449         }
3450
3451         DeleteMidQEntry(mid);
3452         add_credits(server, &credits, CIFS_ECHO_OP);
3453 }
3454
3455 void smb2_reconnect_server(struct work_struct *work)
3456 {
3457         struct TCP_Server_Info *server = container_of(work,
3458                                         struct TCP_Server_Info, reconnect.work);
3459         struct cifs_ses *ses;
3460         struct cifs_tcon *tcon, *tcon2;
3461         struct list_head tmp_list;
3462         int tcon_exist = false;
3463         int rc;
3464         int resched = false;
3465
3466
3467         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3468         mutex_lock(&server->reconnect_mutex);
3469
3470         INIT_LIST_HEAD(&tmp_list);
3471         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3472
3473         spin_lock(&cifs_tcp_ses_lock);
3474         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3475                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3476                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3477                                 tcon->tc_count++;
3478                                 list_add_tail(&tcon->rlist, &tmp_list);
3479                                 tcon_exist = true;
3480                         }
3481                 }
3482                 /*
3483                  * IPC has the same lifetime as its session and uses its
3484                  * refcount.
3485                  */
3486                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3487                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3488                         tcon_exist = true;
3489                         ses->ses_count++;
3490                 }
3491         }
3492         /*
3493          * Get the reference to server struct to be sure that the last call of
3494          * cifs_put_tcon() in the loop below won't release the server pointer.
3495          */
3496         if (tcon_exist)
3497                 server->srv_count++;
3498
3499         spin_unlock(&cifs_tcp_ses_lock);
3500
3501         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3502                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
3503                 if (!rc)
3504                         cifs_reopen_persistent_handles(tcon);
3505                 else
3506                         resched = true;
3507                 list_del_init(&tcon->rlist);
3508                 if (tcon->ipc)
3509                         cifs_put_smb_ses(tcon->ses);
3510                 else
3511                         cifs_put_tcon(tcon);
3512         }
3513
3514         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3515         if (resched)
3516                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3517         mutex_unlock(&server->reconnect_mutex);
3518
3519         /* now we can safely release srv struct */
3520         if (tcon_exist)
3521                 cifs_put_tcp_session(server, 1);
3522 }
3523
3524 int
3525 SMB2_echo(struct TCP_Server_Info *server)
3526 {
3527         struct smb2_echo_req *req;
3528         int rc = 0;
3529         struct kvec iov[1];
3530         struct smb_rqst rqst = { .rq_iov = iov,
3531                                  .rq_nvec = 1 };
3532         unsigned int total_len;
3533
3534         cifs_dbg(FYI, "In echo request\n");
3535
3536         if (server->tcpStatus == CifsNeedNegotiate) {
3537                 /* No need to send echo on newly established connections */
3538                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
3539                 return rc;
3540         }
3541
3542         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
3543         if (rc)
3544                 return rc;
3545
3546         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3547
3548         iov[0].iov_len = total_len;
3549         iov[0].iov_base = (char *)req;
3550
3551         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3552                              server, CIFS_ECHO_OP, NULL);
3553         if (rc)
3554                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3555
3556         cifs_small_buf_release(req);
3557         return rc;
3558 }
3559
3560 void
3561 SMB2_flush_free(struct smb_rqst *rqst)
3562 {
3563         if (rqst && rqst->rq_iov)
3564                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3565 }
3566
3567 int
3568 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3569                 struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid)
3570 {
3571         struct smb2_flush_req *req;
3572         struct kvec *iov = rqst->rq_iov;
3573         unsigned int total_len;
3574         int rc;
3575
3576         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
3577         if (rc)
3578                 return rc;
3579
3580         req->PersistentFileId = persistent_fid;
3581         req->VolatileFileId = volatile_fid;
3582
3583         iov[0].iov_base = (char *)req;
3584         iov[0].iov_len = total_len;
3585
3586         return 0;
3587 }
3588
3589 int
3590 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3591            u64 volatile_fid)
3592 {
3593         struct cifs_ses *ses = tcon->ses;
3594         struct smb_rqst rqst;
3595         struct kvec iov[1];
3596         struct kvec rsp_iov = {NULL, 0};
3597         int resp_buftype = CIFS_NO_BUFFER;
3598         int flags = 0;
3599         int rc = 0;
3600
3601         cifs_dbg(FYI, "flush\n");
3602         if (!ses || !(ses->server))
3603                 return -EIO;
3604
3605         if (smb3_encryption_required(tcon))
3606                 flags |= CIFS_TRANSFORM_REQ;
3607
3608         memset(&rqst, 0, sizeof(struct smb_rqst));
3609         memset(&iov, 0, sizeof(iov));
3610         rqst.rq_iov = iov;
3611         rqst.rq_nvec = 1;
3612
3613         rc = SMB2_flush_init(xid, &rqst, tcon, persistent_fid, volatile_fid);
3614         if (rc)
3615                 goto flush_exit;
3616
3617         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3618         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3619
3620         if (rc != 0) {
3621                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3622                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3623                                      rc);
3624         } else
3625                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
3626                                       ses->Suid);
3627
3628  flush_exit:
3629         SMB2_flush_free(&rqst);
3630         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3631         return rc;
3632 }
3633
3634 /*
3635  * To form a chain of read requests, any read requests after the first should
3636  * have the end_of_chain boolean set to true.
3637  */
3638 static int
3639 smb2_new_read_req(void **buf, unsigned int *total_len,
3640         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3641         unsigned int remaining_bytes, int request_type)
3642 {
3643         int rc = -EACCES;
3644         struct smb2_read_plain_req *req = NULL;
3645         struct smb2_sync_hdr *shdr;
3646         struct TCP_Server_Info *server;
3647
3648         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
3649                                  total_len);
3650         if (rc)
3651                 return rc;
3652
3653         server = io_parms->tcon->ses->server;
3654         if (server == NULL)
3655                 return -ECONNABORTED;
3656
3657         shdr = &req->sync_hdr;
3658         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3659
3660         req->PersistentFileId = io_parms->persistent_fid;
3661         req->VolatileFileId = io_parms->volatile_fid;
3662         req->ReadChannelInfoOffset = 0; /* reserved */
3663         req->ReadChannelInfoLength = 0; /* reserved */
3664         req->Channel = 0; /* reserved */
3665         req->MinimumCount = 0;
3666         req->Length = cpu_to_le32(io_parms->length);
3667         req->Offset = cpu_to_le64(io_parms->offset);
3668
3669         trace_smb3_read_enter(0 /* xid */,
3670                         io_parms->persistent_fid,
3671                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3672                         io_parms->offset, io_parms->length);
3673 #ifdef CONFIG_CIFS_SMB_DIRECT
3674         /*
3675          * If we want to do a RDMA write, fill in and append
3676          * smbd_buffer_descriptor_v1 to the end of read request
3677          */
3678         if (server->rdma && rdata && !server->sign &&
3679                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3680
3681                 struct smbd_buffer_descriptor_v1 *v1;
3682                 bool need_invalidate =
3683                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3684
3685                 rdata->mr = smbd_register_mr(
3686                                 server->smbd_conn, rdata->pages,
3687                                 rdata->nr_pages, rdata->page_offset,
3688                                 rdata->tailsz, true, need_invalidate);
3689                 if (!rdata->mr)
3690                         return -EAGAIN;
3691
3692                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3693                 if (need_invalidate)
3694                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3695                 req->ReadChannelInfoOffset =
3696                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3697                 req->ReadChannelInfoLength =
3698                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3699                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3700                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3701                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3702                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3703
3704                 *total_len += sizeof(*v1) - 1;
3705         }
3706 #endif
3707         if (request_type & CHAINED_REQUEST) {
3708                 if (!(request_type & END_OF_CHAIN)) {
3709                         /* next 8-byte aligned request */
3710                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3711                         shdr->NextCommand = cpu_to_le32(*total_len);
3712                 } else /* END_OF_CHAIN */
3713                         shdr->NextCommand = 0;
3714                 if (request_type & RELATED_REQUEST) {
3715                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3716                         /*
3717                          * Related requests use info from previous read request
3718                          * in chain.
3719                          */
3720                         shdr->SessionId = 0xFFFFFFFF;
3721                         shdr->TreeId = 0xFFFFFFFF;
3722                         req->PersistentFileId = 0xFFFFFFFF;
3723                         req->VolatileFileId = 0xFFFFFFFF;
3724                 }
3725         }
3726         if (remaining_bytes > io_parms->length)
3727                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3728         else
3729                 req->RemainingBytes = 0;
3730
3731         *buf = req;
3732         return rc;
3733 }
3734
3735 static void
3736 smb2_readv_callback(struct mid_q_entry *mid)
3737 {
3738         struct cifs_readdata *rdata = mid->callback_data;
3739         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3740         struct TCP_Server_Info *server = tcon->ses->server;
3741         struct smb2_sync_hdr *shdr =
3742                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3743         struct cifs_credits credits = { .value = 0, .instance = 0 };
3744         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
3745                                  .rq_nvec = 1,
3746                                  .rq_pages = rdata->pages,
3747                                  .rq_offset = rdata->page_offset,
3748                                  .rq_npages = rdata->nr_pages,
3749                                  .rq_pagesz = rdata->pagesz,
3750                                  .rq_tailsz = rdata->tailsz };
3751
3752         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3753                  __func__, mid->mid, mid->mid_state, rdata->result,
3754                  rdata->bytes);
3755
3756         switch (mid->mid_state) {
3757         case MID_RESPONSE_RECEIVED:
3758                 credits.value = le16_to_cpu(shdr->CreditRequest);
3759                 credits.instance = server->reconnect_instance;
3760                 /* result already set, check signature */
3761                 if (server->sign && !mid->decrypted) {
3762                         int rc;
3763
3764                         rc = smb2_verify_signature(&rqst, server);
3765                         if (rc)
3766                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
3767                                          rc);
3768                 }
3769                 /* FIXME: should this be counted toward the initiating task? */
3770                 task_io_account_read(rdata->got_bytes);
3771                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3772                 break;
3773         case MID_REQUEST_SUBMITTED:
3774         case MID_RETRY_NEEDED:
3775                 rdata->result = -EAGAIN;
3776                 if (server->sign && rdata->got_bytes)
3777                         /* reset bytes number since we can not check a sign */
3778                         rdata->got_bytes = 0;
3779                 /* FIXME: should this be counted toward the initiating task? */
3780                 task_io_account_read(rdata->got_bytes);
3781                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3782                 break;
3783         case MID_RESPONSE_MALFORMED:
3784                 credits.value = le16_to_cpu(shdr->CreditRequest);
3785                 credits.instance = server->reconnect_instance;
3786                 /* fall through */
3787         default:
3788                 rdata->result = -EIO;
3789         }
3790 #ifdef CONFIG_CIFS_SMB_DIRECT
3791         /*
3792          * If this rdata has a memmory registered, the MR can be freed
3793          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3794          * because they have limited number and are used for future I/Os
3795          */
3796         if (rdata->mr) {
3797                 smbd_deregister_mr(rdata->mr);
3798                 rdata->mr = NULL;
3799         }
3800 #endif
3801         if (rdata->result && rdata->result != -ENODATA) {
3802                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3803                 trace_smb3_read_err(0 /* xid */,
3804                                     rdata->cfile->fid.persistent_fid,
3805                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3806                                     rdata->bytes, rdata->result);
3807         } else
3808                 trace_smb3_read_done(0 /* xid */,
3809                                      rdata->cfile->fid.persistent_fid,
3810                                      tcon->tid, tcon->ses->Suid,
3811                                      rdata->offset, rdata->got_bytes);
3812
3813         queue_work(cifsiod_wq, &rdata->work);
3814         DeleteMidQEntry(mid);
3815         add_credits(server, &credits, 0);
3816 }
3817
3818 /* smb2_async_readv - send an async read, and set up mid to handle result */
3819 int
3820 smb2_async_readv(struct cifs_readdata *rdata)
3821 {
3822         int rc, flags = 0;
3823         char *buf;
3824         struct smb2_sync_hdr *shdr;
3825         struct cifs_io_parms io_parms;
3826         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3827                                  .rq_nvec = 1 };
3828         struct TCP_Server_Info *server;
3829         unsigned int total_len;
3830
3831         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3832                  __func__, rdata->offset, rdata->bytes);
3833
3834         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3835         io_parms.offset = rdata->offset;
3836         io_parms.length = rdata->bytes;
3837         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3838         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3839         io_parms.pid = rdata->pid;
3840
3841         server = io_parms.tcon->ses->server;
3842
3843         rc = smb2_new_read_req(
3844                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3845         if (rc)
3846                 return rc;
3847
3848         if (smb3_encryption_required(io_parms.tcon))
3849                 flags |= CIFS_TRANSFORM_REQ;
3850
3851         rdata->iov[0].iov_base = buf;
3852         rdata->iov[0].iov_len = total_len;
3853
3854         shdr = (struct smb2_sync_hdr *)buf;
3855
3856         if (rdata->credits.value > 0) {
3857                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3858                                                 SMB2_MAX_BUFFER_SIZE));
3859                 shdr->CreditRequest =
3860                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3861
3862                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
3863                 if (rc)
3864                         goto async_readv_out;
3865
3866                 flags |= CIFS_HAS_CREDITS;
3867         }
3868
3869         kref_get(&rdata->refcount);
3870         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3871                              cifs_readv_receive, smb2_readv_callback,
3872                              smb3_handle_read_data, rdata, flags,
3873                              &rdata->credits);
3874         if (rc) {
3875                 kref_put(&rdata->refcount, cifs_readdata_release);
3876                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3877                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
3878                                     io_parms.tcon->tid,
3879                                     io_parms.tcon->ses->Suid,
3880                                     io_parms.offset, io_parms.length, rc);
3881         }
3882
3883 async_readv_out:
3884         cifs_small_buf_release(buf);
3885         return rc;
3886 }
3887
3888 int
3889 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3890           unsigned int *nbytes, char **buf, int *buf_type)
3891 {
3892         struct smb_rqst rqst;
3893         int resp_buftype, rc;
3894         struct smb2_read_plain_req *req = NULL;
3895         struct smb2_read_rsp *rsp = NULL;
3896         struct kvec iov[1];
3897         struct kvec rsp_iov;
3898         unsigned int total_len;
3899         int flags = CIFS_LOG_ERROR;
3900         struct cifs_ses *ses = io_parms->tcon->ses;
3901
3902         *nbytes = 0;
3903         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3904         if (rc)
3905                 return rc;
3906
3907         if (smb3_encryption_required(io_parms->tcon))
3908                 flags |= CIFS_TRANSFORM_REQ;
3909
3910         iov[0].iov_base = (char *)req;
3911         iov[0].iov_len = total_len;
3912
3913         memset(&rqst, 0, sizeof(struct smb_rqst));
3914         rqst.rq_iov = iov;
3915         rqst.rq_nvec = 1;
3916
3917         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3918         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3919
3920         if (rc) {
3921                 if (rc != -ENODATA) {
3922                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3923                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3924                         trace_smb3_read_err(xid, req->PersistentFileId,
3925                                             io_parms->tcon->tid, ses->Suid,
3926                                             io_parms->offset, io_parms->length,
3927                                             rc);
3928                 } else
3929                         trace_smb3_read_done(xid, req->PersistentFileId,
3930                                     io_parms->tcon->tid, ses->Suid,
3931                                     io_parms->offset, 0);
3932                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3933                 cifs_small_buf_release(req);
3934                 return rc == -ENODATA ? 0 : rc;
3935         } else
3936                 trace_smb3_read_done(xid, req->PersistentFileId,
3937                                     io_parms->tcon->tid, ses->Suid,
3938                                     io_parms->offset, io_parms->length);
3939
3940         cifs_small_buf_release(req);
3941
3942         *nbytes = le32_to_cpu(rsp->DataLength);
3943         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3944             (*nbytes > io_parms->length)) {
3945                 cifs_dbg(FYI, "bad length %d for count %d\n",
3946                          *nbytes, io_parms->length);
3947                 rc = -EIO;
3948                 *nbytes = 0;
3949         }
3950
3951         if (*buf) {
3952                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3953                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3954         } else if (resp_buftype != CIFS_NO_BUFFER) {
3955                 *buf = rsp_iov.iov_base;
3956                 if (resp_buftype == CIFS_SMALL_BUFFER)
3957                         *buf_type = CIFS_SMALL_BUFFER;
3958                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3959                         *buf_type = CIFS_LARGE_BUFFER;
3960         }
3961         return rc;
3962 }
3963
3964 /*
3965  * Check the mid_state and signature on received buffer (if any), and queue the
3966  * workqueue completion task.
3967  */
3968 static void
3969 smb2_writev_callback(struct mid_q_entry *mid)
3970 {
3971         struct cifs_writedata *wdata = mid->callback_data;
3972         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3973         struct TCP_Server_Info *server = tcon->ses->server;
3974         unsigned int written;
3975         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3976         struct cifs_credits credits = { .value = 0, .instance = 0 };
3977
3978         switch (mid->mid_state) {
3979         case MID_RESPONSE_RECEIVED:
3980                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3981                 credits.instance = server->reconnect_instance;
3982                 wdata->result = smb2_check_receive(mid, server, 0);
3983                 if (wdata->result != 0)
3984                         break;
3985
3986                 written = le32_to_cpu(rsp->DataLength);
3987                 /*
3988                  * Mask off high 16 bits when bytes written as returned
3989                  * by the server is greater than bytes requested by the
3990                  * client. OS/2 servers are known to set incorrect
3991                  * CountHigh values.
3992                  */
3993                 if (written > wdata->bytes)
3994                         written &= 0xFFFF;
3995
3996                 if (written < wdata->bytes)
3997                         wdata->result = -ENOSPC;
3998                 else
3999                         wdata->bytes = written;
4000                 break;
4001         case MID_REQUEST_SUBMITTED:
4002         case MID_RETRY_NEEDED:
4003                 wdata->result = -EAGAIN;
4004                 break;
4005         case MID_RESPONSE_MALFORMED:
4006                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4007                 credits.instance = server->reconnect_instance;
4008                 /* fall through */
4009         default:
4010                 wdata->result = -EIO;
4011                 break;
4012         }
4013 #ifdef CONFIG_CIFS_SMB_DIRECT
4014         /*
4015          * If this wdata has a memory registered, the MR can be freed
4016          * The number of MRs available is limited, it's important to recover
4017          * used MR as soon as I/O is finished. Hold MR longer in the later
4018          * I/O process can possibly result in I/O deadlock due to lack of MR
4019          * to send request on I/O retry
4020          */
4021         if (wdata->mr) {
4022                 smbd_deregister_mr(wdata->mr);
4023                 wdata->mr = NULL;
4024         }
4025 #endif
4026         if (wdata->result) {
4027                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4028                 trace_smb3_write_err(0 /* no xid */,
4029                                      wdata->cfile->fid.persistent_fid,
4030                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4031                                      wdata->bytes, wdata->result);
4032                 if (wdata->result == -ENOSPC)
4033                         printk_once(KERN_WARNING "Out of space writing to %s\n",
4034                                     tcon->treeName);
4035         } else
4036                 trace_smb3_write_done(0 /* no xid */,
4037                                       wdata->cfile->fid.persistent_fid,
4038                                       tcon->tid, tcon->ses->Suid,
4039                                       wdata->offset, wdata->bytes);
4040
4041         queue_work(cifsiod_wq, &wdata->work);
4042         DeleteMidQEntry(mid);
4043         add_credits(server, &credits, 0);
4044 }
4045
4046 /* smb2_async_writev - send an async write, and set up mid to handle result */
4047 int
4048 smb2_async_writev(struct cifs_writedata *wdata,
4049                   void (*release)(struct kref *kref))
4050 {
4051         int rc = -EACCES, flags = 0;
4052         struct smb2_write_req *req = NULL;
4053         struct smb2_sync_hdr *shdr;
4054         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4055         struct TCP_Server_Info *server = tcon->ses->server;
4056         struct kvec iov[1];
4057         struct smb_rqst rqst = { };
4058         unsigned int total_len;
4059
4060         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
4061         if (rc)
4062                 return rc;
4063
4064         if (smb3_encryption_required(tcon))
4065                 flags |= CIFS_TRANSFORM_REQ;
4066
4067         shdr = (struct smb2_sync_hdr *)req;
4068         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
4069
4070         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
4071         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
4072         req->WriteChannelInfoOffset = 0;
4073         req->WriteChannelInfoLength = 0;
4074         req->Channel = 0;
4075         req->Offset = cpu_to_le64(wdata->offset);
4076         req->DataOffset = cpu_to_le16(
4077                                 offsetof(struct smb2_write_req, Buffer));
4078         req->RemainingBytes = 0;
4079
4080         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
4081                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
4082 #ifdef CONFIG_CIFS_SMB_DIRECT
4083         /*
4084          * If we want to do a server RDMA read, fill in and append
4085          * smbd_buffer_descriptor_v1 to the end of write request
4086          */
4087         if (server->rdma && !server->sign && wdata->bytes >=
4088                 server->smbd_conn->rdma_readwrite_threshold) {
4089
4090                 struct smbd_buffer_descriptor_v1 *v1;
4091                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4092
4093                 wdata->mr = smbd_register_mr(
4094                                 server->smbd_conn, wdata->pages,
4095                                 wdata->nr_pages, wdata->page_offset,
4096                                 wdata->tailsz, false, need_invalidate);
4097                 if (!wdata->mr) {
4098                         rc = -EAGAIN;
4099                         goto async_writev_out;
4100                 }
4101                 req->Length = 0;
4102                 req->DataOffset = 0;
4103                 if (wdata->nr_pages > 1)
4104                         req->RemainingBytes =
4105                                 cpu_to_le32(
4106                                         (wdata->nr_pages - 1) * wdata->pagesz -
4107                                         wdata->page_offset + wdata->tailsz
4108                                 );
4109                 else
4110                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
4111                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4112                 if (need_invalidate)
4113                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4114                 req->WriteChannelInfoOffset =
4115                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4116                 req->WriteChannelInfoLength =
4117                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4118                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4119                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4120                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4121                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4122         }
4123 #endif
4124         iov[0].iov_len = total_len - 1;
4125         iov[0].iov_base = (char *)req;
4126
4127         rqst.rq_iov = iov;
4128         rqst.rq_nvec = 1;
4129         rqst.rq_pages = wdata->pages;
4130         rqst.rq_offset = wdata->page_offset;
4131         rqst.rq_npages = wdata->nr_pages;
4132         rqst.rq_pagesz = wdata->pagesz;
4133         rqst.rq_tailsz = wdata->tailsz;
4134 #ifdef CONFIG_CIFS_SMB_DIRECT
4135         if (wdata->mr) {
4136                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4137                 rqst.rq_npages = 0;
4138         }
4139 #endif
4140         cifs_dbg(FYI, "async write at %llu %u bytes\n",
4141                  wdata->offset, wdata->bytes);
4142
4143 #ifdef CONFIG_CIFS_SMB_DIRECT
4144         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4145         if (!wdata->mr)
4146                 req->Length = cpu_to_le32(wdata->bytes);
4147 #else
4148         req->Length = cpu_to_le32(wdata->bytes);
4149 #endif
4150
4151         if (wdata->credits.value > 0) {
4152                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4153                                                     SMB2_MAX_BUFFER_SIZE));
4154                 shdr->CreditRequest =
4155                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
4156
4157                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4158                 if (rc)
4159                         goto async_writev_out;
4160
4161                 flags |= CIFS_HAS_CREDITS;
4162         }
4163
4164         kref_get(&wdata->refcount);
4165         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4166                              wdata, flags, &wdata->credits);
4167
4168         if (rc) {
4169                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
4170                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4171                                      wdata->bytes, rc);
4172                 kref_put(&wdata->refcount, release);
4173                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4174         }
4175
4176 async_writev_out:
4177         cifs_small_buf_release(req);
4178         return rc;
4179 }
4180
4181 /*
4182  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4183  * The length field from io_parms must be at least 1 and indicates a number of
4184  * elements with data to write that begins with position 1 in iov array. All
4185  * data length is specified by count.
4186  */
4187 int
4188 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4189            unsigned int *nbytes, struct kvec *iov, int n_vec)
4190 {
4191         struct smb_rqst rqst;
4192         int rc = 0;
4193         struct smb2_write_req *req = NULL;
4194         struct smb2_write_rsp *rsp = NULL;
4195         int resp_buftype;
4196         struct kvec rsp_iov;
4197         int flags = 0;
4198         unsigned int total_len;
4199
4200         *nbytes = 0;
4201
4202         if (n_vec < 1)
4203                 return rc;
4204
4205         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
4206                              &total_len);
4207         if (rc)
4208                 return rc;
4209
4210         if (io_parms->tcon->ses->server == NULL)
4211                 return -ECONNABORTED;
4212
4213         if (smb3_encryption_required(io_parms->tcon))
4214                 flags |= CIFS_TRANSFORM_REQ;
4215
4216         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
4217
4218         req->PersistentFileId = io_parms->persistent_fid;
4219         req->VolatileFileId = io_parms->volatile_fid;
4220         req->WriteChannelInfoOffset = 0;
4221         req->WriteChannelInfoLength = 0;
4222         req->Channel = 0;
4223         req->Length = cpu_to_le32(io_parms->length);
4224         req->Offset = cpu_to_le64(io_parms->offset);
4225         req->DataOffset = cpu_to_le16(
4226                                 offsetof(struct smb2_write_req, Buffer));
4227         req->RemainingBytes = 0;
4228
4229         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4230                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4231                 io_parms->offset, io_parms->length);
4232
4233         iov[0].iov_base = (char *)req;
4234         /* 1 for Buffer */
4235         iov[0].iov_len = total_len - 1;
4236
4237         memset(&rqst, 0, sizeof(struct smb_rqst));
4238         rqst.rq_iov = iov;
4239         rqst.rq_nvec = n_vec + 1;
4240
4241         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
4242                             &resp_buftype, flags, &rsp_iov);
4243         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4244
4245         if (rc) {
4246                 trace_smb3_write_err(xid, req->PersistentFileId,
4247                                      io_parms->tcon->tid,
4248                                      io_parms->tcon->ses->Suid,
4249                                      io_parms->offset, io_parms->length, rc);
4250                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4251                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4252         } else {
4253                 *nbytes = le32_to_cpu(rsp->DataLength);
4254                 trace_smb3_write_done(xid, req->PersistentFileId,
4255                                      io_parms->tcon->tid,
4256                                      io_parms->tcon->ses->Suid,
4257                                      io_parms->offset, *nbytes);
4258         }
4259
4260         cifs_small_buf_release(req);
4261         free_rsp_buf(resp_buftype, rsp);
4262         return rc;
4263 }
4264
4265 static unsigned int
4266 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
4267 {
4268         int len;
4269         unsigned int entrycount = 0;
4270         unsigned int next_offset = 0;
4271         char *entryptr;
4272         FILE_DIRECTORY_INFO *dir_info;
4273
4274         if (bufstart == NULL)
4275                 return 0;
4276
4277         entryptr = bufstart;
4278
4279         while (1) {
4280                 if (entryptr + next_offset < entryptr ||
4281                     entryptr + next_offset > end_of_buf ||
4282                     entryptr + next_offset + size > end_of_buf) {
4283                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4284                         break;
4285                 }
4286
4287                 entryptr = entryptr + next_offset;
4288                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4289
4290                 len = le32_to_cpu(dir_info->FileNameLength);
4291                 if (entryptr + len < entryptr ||
4292                     entryptr + len > end_of_buf ||
4293                     entryptr + len + size > end_of_buf) {
4294                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4295                                  end_of_buf);
4296                         break;
4297                 }
4298
4299                 *lastentry = entryptr;
4300                 entrycount++;
4301
4302                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4303                 if (!next_offset)
4304                         break;
4305         }
4306
4307         return entrycount;
4308 }
4309
4310 /*
4311  * Readdir/FindFirst
4312  */
4313 int SMB2_query_directory_init(const unsigned int xid,
4314                               struct cifs_tcon *tcon, struct smb_rqst *rqst,
4315                               u64 persistent_fid, u64 volatile_fid,
4316                               int index, int info_level)
4317 {
4318         struct TCP_Server_Info *server = tcon->ses->server;
4319         struct smb2_query_directory_req *req;
4320         unsigned char *bufptr;
4321         __le16 asteriks = cpu_to_le16('*');
4322         unsigned int output_size = CIFSMaxBufSize -
4323                 MAX_SMB2_CREATE_RESPONSE_SIZE -
4324                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
4325         unsigned int total_len;
4326         struct kvec *iov = rqst->rq_iov;
4327         int len, rc;
4328
4329         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
4330                              &total_len);
4331         if (rc)
4332                 return rc;
4333
4334         switch (info_level) {
4335         case SMB_FIND_FILE_DIRECTORY_INFO:
4336                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4337                 break;
4338         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4339                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4340                 break;
4341         default:
4342                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4343                         info_level);
4344                 return -EINVAL;
4345         }
4346
4347         req->FileIndex = cpu_to_le32(index);
4348         req->PersistentFileId = persistent_fid;
4349         req->VolatileFileId = volatile_fid;
4350
4351         len = 0x2;
4352         bufptr = req->Buffer;
4353         memcpy(bufptr, &asteriks, len);
4354
4355         req->FileNameOffset =
4356                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4357         req->FileNameLength = cpu_to_le16(len);
4358         /*
4359          * BB could be 30 bytes or so longer if we used SMB2 specific
4360          * buffer lengths, but this is safe and close enough.
4361          */
4362         output_size = min_t(unsigned int, output_size, server->maxBuf);
4363         output_size = min_t(unsigned int, output_size, 2 << 15);
4364         req->OutputBufferLength = cpu_to_le32(output_size);
4365
4366         iov[0].iov_base = (char *)req;
4367         /* 1 for Buffer */
4368         iov[0].iov_len = total_len - 1;
4369
4370         iov[1].iov_base = (char *)(req->Buffer);
4371         iov[1].iov_len = len;
4372
4373         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4374                         tcon->ses->Suid, index, output_size);
4375
4376         return 0;
4377 }
4378
4379 void SMB2_query_directory_free(struct smb_rqst *rqst)
4380 {
4381         if (rqst && rqst->rq_iov) {
4382                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4383         }
4384 }
4385
4386 int
4387 smb2_parse_query_directory(struct cifs_tcon *tcon,
4388                            struct kvec *rsp_iov,
4389                            int resp_buftype,
4390                            struct cifs_search_info *srch_inf)
4391 {
4392         struct smb2_query_directory_rsp *rsp;
4393         size_t info_buf_size;
4394         char *end_of_smb;
4395         int rc;
4396
4397         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4398
4399         switch (srch_inf->info_level) {
4400         case SMB_FIND_FILE_DIRECTORY_INFO:
4401                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4402                 break;
4403         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4404                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4405                 break;
4406         default:
4407                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4408                          srch_inf->info_level);
4409                 return -EINVAL;
4410         }
4411
4412         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4413                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4414                                info_buf_size);
4415         if (rc)
4416                 return rc;
4417
4418         srch_inf->unicode = true;
4419
4420         if (srch_inf->ntwrk_buf_start) {
4421                 if (srch_inf->smallBuf)
4422                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4423                 else
4424                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4425         }
4426         srch_inf->ntwrk_buf_start = (char *)rsp;
4427         srch_inf->srch_entries_start = srch_inf->last_entry =
4428                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4429         end_of_smb = rsp_iov->iov_len + (char *)rsp;
4430         srch_inf->entries_in_buffer =
4431                         num_entries(srch_inf->srch_entries_start, end_of_smb,
4432                                     &srch_inf->last_entry, info_buf_size);
4433         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4434         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4435                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4436                  srch_inf->srch_entries_start, srch_inf->last_entry);
4437         if (resp_buftype == CIFS_LARGE_BUFFER)
4438                 srch_inf->smallBuf = false;
4439         else if (resp_buftype == CIFS_SMALL_BUFFER)
4440                 srch_inf->smallBuf = true;
4441         else
4442                 cifs_tcon_dbg(VFS, "illegal search buffer type\n");
4443
4444         return 0;
4445 }
4446
4447 int
4448 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4449                      u64 persistent_fid, u64 volatile_fid, int index,
4450                      struct cifs_search_info *srch_inf)
4451 {
4452         struct smb_rqst rqst;
4453         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
4454         struct smb2_query_directory_rsp *rsp = NULL;
4455         int resp_buftype = CIFS_NO_BUFFER;
4456         struct kvec rsp_iov;
4457         int rc = 0;
4458         struct cifs_ses *ses = tcon->ses;
4459         int flags = 0;
4460
4461         if (!ses || !(ses->server))
4462                 return -EIO;
4463
4464         if (smb3_encryption_required(tcon))
4465                 flags |= CIFS_TRANSFORM_REQ;
4466
4467         memset(&rqst, 0, sizeof(struct smb_rqst));
4468         memset(&iov, 0, sizeof(iov));
4469         rqst.rq_iov = iov;
4470         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
4471
4472         rc = SMB2_query_directory_init(xid, tcon, &rqst, persistent_fid,
4473                                        volatile_fid, index,
4474                                        srch_inf->info_level);
4475         if (rc)
4476                 goto qdir_exit;
4477
4478         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4479         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4480
4481         if (rc) {
4482                 if (rc == -ENODATA &&
4483                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4484                         trace_smb3_query_dir_done(xid, persistent_fid,
4485                                 tcon->tid, tcon->ses->Suid, index, 0);
4486                         srch_inf->endOfSearch = true;
4487                         rc = 0;
4488                 } else {
4489                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4490                                 tcon->ses->Suid, index, 0, rc);
4491                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4492                 }
4493                 goto qdir_exit;
4494         }
4495
4496         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
4497                                         srch_inf);
4498         if (rc) {
4499                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4500                         tcon->ses->Suid, index, 0, rc);
4501                 goto qdir_exit;
4502         }
4503         resp_buftype = CIFS_NO_BUFFER;
4504
4505         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4506                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4507
4508 qdir_exit:
4509         SMB2_query_directory_free(&rqst);
4510         free_rsp_buf(resp_buftype, rsp);
4511         return rc;
4512 }
4513
4514 int
4515 SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
4516                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4517                u8 info_type, u32 additional_info,
4518                 void **data, unsigned int *size)
4519 {
4520         struct smb2_set_info_req *req;
4521         struct kvec *iov = rqst->rq_iov;
4522         unsigned int i, total_len;
4523         int rc;
4524
4525         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
4526         if (rc)
4527                 return rc;
4528
4529         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4530         req->InfoType = info_type;
4531         req->FileInfoClass = info_class;
4532         req->PersistentFileId = persistent_fid;
4533         req->VolatileFileId = volatile_fid;
4534         req->AdditionalInformation = cpu_to_le32(additional_info);
4535
4536         req->BufferOffset =
4537                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4538         req->BufferLength = cpu_to_le32(*size);
4539
4540         memcpy(req->Buffer, *data, *size);
4541         total_len += *size;
4542
4543         iov[0].iov_base = (char *)req;
4544         /* 1 for Buffer */
4545         iov[0].iov_len = total_len - 1;
4546
4547         for (i = 1; i < rqst->rq_nvec; i++) {
4548                 le32_add_cpu(&req->BufferLength, size[i]);
4549                 iov[i].iov_base = (char *)data[i];
4550                 iov[i].iov_len = size[i];
4551         }
4552
4553         return 0;
4554 }
4555
4556 void
4557 SMB2_set_info_free(struct smb_rqst *rqst)
4558 {
4559         if (rqst && rqst->rq_iov)
4560                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4561 }
4562
4563 static int
4564 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4565                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4566                u8 info_type, u32 additional_info, unsigned int num,
4567                 void **data, unsigned int *size)
4568 {
4569         struct smb_rqst rqst;
4570         struct smb2_set_info_rsp *rsp = NULL;
4571         struct kvec *iov;
4572         struct kvec rsp_iov;
4573         int rc = 0;
4574         int resp_buftype;
4575         struct cifs_ses *ses = tcon->ses;
4576         int flags = 0;
4577
4578         if (!ses || !(ses->server))
4579                 return -EIO;
4580
4581         if (!num)
4582                 return -EINVAL;
4583
4584         if (smb3_encryption_required(tcon))
4585                 flags |= CIFS_TRANSFORM_REQ;
4586
4587         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4588         if (!iov)
4589                 return -ENOMEM;
4590
4591         memset(&rqst, 0, sizeof(struct smb_rqst));
4592         rqst.rq_iov = iov;
4593         rqst.rq_nvec = num;
4594
4595         rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid,
4596                                 info_class, info_type, additional_info,
4597                                 data, size);
4598         if (rc) {
4599                 kfree(iov);
4600                 return rc;
4601         }
4602
4603
4604         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
4605                             &rsp_iov);
4606         SMB2_set_info_free(&rqst);
4607         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4608
4609         if (rc != 0) {
4610                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4611                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4612                                 ses->Suid, info_class, (__u32)info_type, rc);
4613         }
4614
4615         free_rsp_buf(resp_buftype, rsp);
4616         kfree(iov);
4617         return rc;
4618 }
4619
4620 int
4621 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4622              u64 volatile_fid, u32 pid, __le64 *eof)
4623 {
4624         struct smb2_file_eof_info info;
4625         void *data;
4626         unsigned int size;
4627
4628         info.EndOfFile = *eof;
4629
4630         data = &info;
4631         size = sizeof(struct smb2_file_eof_info);
4632
4633         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4634                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4635                         0, 1, &data, &size);
4636 }
4637
4638 int
4639 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4640                 u64 persistent_fid, u64 volatile_fid,
4641                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4642 {
4643         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4644                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4645                         1, (void **)&pnntsd, &pacllen);
4646 }
4647
4648 int
4649 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4650             u64 persistent_fid, u64 volatile_fid,
4651             struct smb2_file_full_ea_info *buf, int len)
4652 {
4653         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4654                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4655                 0, 1, (void **)&buf, &len);
4656 }
4657
4658 int
4659 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4660                   const u64 persistent_fid, const u64 volatile_fid,
4661                   __u8 oplock_level)
4662 {
4663         struct smb_rqst rqst;
4664         int rc;
4665         struct smb2_oplock_break *req = NULL;
4666         struct cifs_ses *ses = tcon->ses;
4667         int flags = CIFS_OBREAK_OP;
4668         unsigned int total_len;
4669         struct kvec iov[1];
4670         struct kvec rsp_iov;
4671         int resp_buf_type;
4672
4673         cifs_dbg(FYI, "SMB2_oplock_break\n");
4674         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4675                              &total_len);
4676         if (rc)
4677                 return rc;
4678
4679         if (smb3_encryption_required(tcon))
4680                 flags |= CIFS_TRANSFORM_REQ;
4681
4682         req->VolatileFid = volatile_fid;
4683         req->PersistentFid = persistent_fid;
4684         req->OplockLevel = oplock_level;
4685         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4686
4687         flags |= CIFS_NO_RSP_BUF;
4688
4689         iov[0].iov_base = (char *)req;
4690         iov[0].iov_len = total_len;
4691
4692         memset(&rqst, 0, sizeof(struct smb_rqst));
4693         rqst.rq_iov = iov;
4694         rqst.rq_nvec = 1;
4695
4696         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4697         cifs_small_buf_release(req);
4698
4699         if (rc) {
4700                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4701                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
4702         }
4703
4704         return rc;
4705 }
4706
4707 void
4708 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
4709                              struct kstatfs *kst)
4710 {
4711         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
4712                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
4713         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
4714         kst->f_bfree  = kst->f_bavail =
4715                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
4716         return;
4717 }
4718
4719 static void
4720 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
4721                         struct kstatfs *kst)
4722 {
4723         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
4724         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
4725         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
4726         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
4727                 kst->f_bavail = kst->f_bfree;
4728         else
4729                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
4730         if (response_data->TotalFileNodes != cpu_to_le64(-1))
4731                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
4732         if (response_data->FreeFileNodes != cpu_to_le64(-1))
4733                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
4734
4735         return;
4736 }
4737
4738 static int
4739 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
4740                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
4741 {
4742         int rc;
4743         struct smb2_query_info_req *req;
4744         unsigned int total_len;
4745
4746         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
4747
4748         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
4749                 return -EIO;
4750
4751         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
4752                              &total_len);
4753         if (rc)
4754                 return rc;
4755
4756         req->InfoType = SMB2_O_INFO_FILESYSTEM;
4757         req->FileInfoClass = level;
4758         req->PersistentFileId = persistent_fid;
4759         req->VolatileFileId = volatile_fid;
4760         /* 1 for pad */
4761         req->InputBufferOffset =
4762                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4763         req->OutputBufferLength = cpu_to_le32(
4764                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4765
4766         iov->iov_base = (char *)req;
4767         iov->iov_len = total_len;
4768         return 0;
4769 }
4770
4771 int
4772 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4773               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4774 {
4775         struct smb_rqst rqst;
4776         struct smb2_query_info_rsp *rsp = NULL;
4777         struct kvec iov;
4778         struct kvec rsp_iov;
4779         int rc = 0;
4780         int resp_buftype;
4781         struct cifs_ses *ses = tcon->ses;
4782         FILE_SYSTEM_POSIX_INFO *info = NULL;
4783         int flags = 0;
4784
4785         rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4786                                 sizeof(FILE_SYSTEM_POSIX_INFO),
4787                                 persistent_fid, volatile_fid);
4788         if (rc)
4789                 return rc;
4790
4791         if (smb3_encryption_required(tcon))
4792                 flags |= CIFS_TRANSFORM_REQ;
4793
4794         memset(&rqst, 0, sizeof(struct smb_rqst));
4795         rqst.rq_iov = &iov;
4796         rqst.rq_nvec = 1;
4797
4798         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4799         cifs_small_buf_release(iov.iov_base);
4800         if (rc) {
4801                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4802                 goto posix_qfsinf_exit;
4803         }
4804         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4805
4806         info = (FILE_SYSTEM_POSIX_INFO *)(
4807                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4808         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4809                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4810                                sizeof(FILE_SYSTEM_POSIX_INFO));
4811         if (!rc)
4812                 copy_posix_fs_info_to_kstatfs(info, fsdata);
4813
4814 posix_qfsinf_exit:
4815         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4816         return rc;
4817 }
4818
4819 int
4820 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
4821               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4822 {
4823         struct smb_rqst rqst;
4824         struct smb2_query_info_rsp *rsp = NULL;
4825         struct kvec iov;
4826         struct kvec rsp_iov;
4827         int rc = 0;
4828         int resp_buftype;
4829         struct cifs_ses *ses = tcon->ses;
4830         struct smb2_fs_full_size_info *info = NULL;
4831         int flags = 0;
4832
4833         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
4834                                 sizeof(struct smb2_fs_full_size_info),
4835                                 persistent_fid, volatile_fid);
4836         if (rc)
4837                 return rc;
4838
4839         if (smb3_encryption_required(tcon))
4840                 flags |= CIFS_TRANSFORM_REQ;
4841
4842         memset(&rqst, 0, sizeof(struct smb_rqst));
4843         rqst.rq_iov = &iov;
4844         rqst.rq_nvec = 1;
4845
4846         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4847         cifs_small_buf_release(iov.iov_base);
4848         if (rc) {
4849                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4850                 goto qfsinf_exit;
4851         }
4852         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4853
4854         info = (struct smb2_fs_full_size_info *)(
4855                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4856         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4857                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4858                                sizeof(struct smb2_fs_full_size_info));
4859         if (!rc)
4860                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
4861
4862 qfsinf_exit:
4863         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4864         return rc;
4865 }
4866
4867 int
4868 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4869               u64 persistent_fid, u64 volatile_fid, int level)
4870 {
4871         struct smb_rqst rqst;
4872         struct smb2_query_info_rsp *rsp = NULL;
4873         struct kvec iov;
4874         struct kvec rsp_iov;
4875         int rc = 0;
4876         int resp_buftype, max_len, min_len;
4877         struct cifs_ses *ses = tcon->ses;
4878         unsigned int rsp_len, offset;
4879         int flags = 0;
4880
4881         if (level == FS_DEVICE_INFORMATION) {
4882                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4883                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4884         } else if (level == FS_ATTRIBUTE_INFORMATION) {
4885                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4886                 min_len = MIN_FS_ATTR_INFO_SIZE;
4887         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4888                 max_len = sizeof(struct smb3_fs_ss_info);
4889                 min_len = sizeof(struct smb3_fs_ss_info);
4890         } else if (level == FS_VOLUME_INFORMATION) {
4891                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
4892                 min_len = sizeof(struct smb3_fs_vol_info);
4893         } else {
4894                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4895                 return -EINVAL;
4896         }
4897
4898         rc = build_qfs_info_req(&iov, tcon, level, max_len,
4899                                 persistent_fid, volatile_fid);
4900         if (rc)
4901                 return rc;
4902
4903         if (smb3_encryption_required(tcon))
4904                 flags |= CIFS_TRANSFORM_REQ;
4905
4906         memset(&rqst, 0, sizeof(struct smb_rqst));
4907         rqst.rq_iov = &iov;
4908         rqst.rq_nvec = 1;
4909
4910         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4911         cifs_small_buf_release(iov.iov_base);
4912         if (rc) {
4913                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4914                 goto qfsattr_exit;
4915         }
4916         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4917
4918         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4919         offset = le16_to_cpu(rsp->OutputBufferOffset);
4920         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
4921         if (rc)
4922                 goto qfsattr_exit;
4923
4924         if (level == FS_ATTRIBUTE_INFORMATION)
4925                 memcpy(&tcon->fsAttrInfo, offset
4926                         + (char *)rsp, min_t(unsigned int,
4927                         rsp_len, max_len));
4928         else if (level == FS_DEVICE_INFORMATION)
4929                 memcpy(&tcon->fsDevInfo, offset
4930                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4931         else if (level == FS_SECTOR_SIZE_INFORMATION) {
4932                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4933                         (offset + (char *)rsp);
4934                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4935                 tcon->perf_sector_size =
4936                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4937         } else if (level == FS_VOLUME_INFORMATION) {
4938                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
4939                         (offset + (char *)rsp);
4940                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
4941                 tcon->vol_create_time = vol_info->VolumeCreationTime;
4942         }
4943
4944 qfsattr_exit:
4945         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4946         return rc;
4947 }
4948
4949 int
4950 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4951            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4952            const __u32 num_lock, struct smb2_lock_element *buf)
4953 {
4954         struct smb_rqst rqst;
4955         int rc = 0;
4956         struct smb2_lock_req *req = NULL;
4957         struct kvec iov[2];
4958         struct kvec rsp_iov;
4959         int resp_buf_type;
4960         unsigned int count;
4961         int flags = CIFS_NO_RSP_BUF;
4962         unsigned int total_len;
4963
4964         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4965
4966         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4967         if (rc)
4968                 return rc;
4969
4970         if (smb3_encryption_required(tcon))
4971                 flags |= CIFS_TRANSFORM_REQ;
4972
4973         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4974         req->LockCount = cpu_to_le16(num_lock);
4975
4976         req->PersistentFileId = persist_fid;
4977         req->VolatileFileId = volatile_fid;
4978
4979         count = num_lock * sizeof(struct smb2_lock_element);
4980
4981         iov[0].iov_base = (char *)req;
4982         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4983         iov[1].iov_base = (char *)buf;
4984         iov[1].iov_len = count;
4985
4986         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4987
4988         memset(&rqst, 0, sizeof(struct smb_rqst));
4989         rqst.rq_iov = iov;
4990         rqst.rq_nvec = 2;
4991
4992         rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4993                             &rsp_iov);
4994         cifs_small_buf_release(req);
4995         if (rc) {
4996                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4997                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4998                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4999                                     tcon->ses->Suid, rc);
5000         }
5001
5002         return rc;
5003 }
5004
5005 int
5006 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5007           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5008           const __u64 length, const __u64 offset, const __u32 lock_flags,
5009           const bool wait)
5010 {
5011         struct smb2_lock_element lock;
5012
5013         lock.Offset = cpu_to_le64(offset);
5014         lock.Length = cpu_to_le64(length);
5015         lock.Flags = cpu_to_le32(lock_flags);
5016         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5017                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5018
5019         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5020 }
5021
5022 int
5023 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5024                  __u8 *lease_key, const __le32 lease_state)
5025 {
5026         struct smb_rqst rqst;
5027         int rc;
5028         struct smb2_lease_ack *req = NULL;
5029         struct cifs_ses *ses = tcon->ses;
5030         int flags = CIFS_OBREAK_OP;
5031         unsigned int total_len;
5032         struct kvec iov[1];
5033         struct kvec rsp_iov;
5034         int resp_buf_type;
5035         __u64 *please_key_high;
5036         __u64 *please_key_low;
5037
5038         cifs_dbg(FYI, "SMB2_lease_break\n");
5039         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
5040                              &total_len);
5041         if (rc)
5042                 return rc;
5043
5044         if (smb3_encryption_required(tcon))
5045                 flags |= CIFS_TRANSFORM_REQ;
5046
5047         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5048         req->StructureSize = cpu_to_le16(36);
5049         total_len += 12;
5050
5051         memcpy(req->LeaseKey, lease_key, 16);
5052         req->LeaseState = lease_state;
5053
5054         flags |= CIFS_NO_RSP_BUF;
5055
5056         iov[0].iov_base = (char *)req;
5057         iov[0].iov_len = total_len;
5058
5059         memset(&rqst, 0, sizeof(struct smb_rqst));
5060         rqst.rq_iov = iov;
5061         rqst.rq_nvec = 1;
5062
5063         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
5064         cifs_small_buf_release(req);
5065
5066         please_key_low = (__u64 *)lease_key;
5067         please_key_high = (__u64 *)(lease_key+8);
5068         if (rc) {
5069                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5070                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5071                         ses->Suid, *please_key_low, *please_key_high, rc);
5072                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5073         } else
5074                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5075                         ses->Suid, *please_key_low, *please_key_high);
5076
5077         return rc;
5078 }