fs/cifs/smb2pdu.c

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