fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/uuid.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/xattr.h>
  39 #include "smb2pdu.h"
  40 #include "cifsglob.h"
  41 #include "cifsacl.h"
  42 #include "cifsproto.h"
  43 #include "smb2proto.h"
  44 #include "cifs_unicode.h"
  45 #include "cifs_debug.h"
  46 #include "ntlmssp.h"
  47 #include "smb2status.h"
  48 #include "smb2glob.h"
  49 #include "cifspdu.h"
  50 #include "cifs_spnego.h"
  51 #include "smbdirect.h"
  52 #include "trace.h"
  53 #ifdef CONFIG_CIFS_DFS_UPCALL
  54 #include "dfs_cache.h"
  55 #endif
  56
  57 /*
  58  *  The following table defines the expected "StructureSize" of SMB2 requests
  59  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  60  *
  61  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  62  *  indexed by command in host byte order.
  63  */
  64 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  65         /* SMB2_NEGOTIATE */ 36,
  66         /* SMB2_SESSION_SETUP */ 25,
  67         /* SMB2_LOGOFF */ 4,
  68         /* SMB2_TREE_CONNECT */ 9,
  69         /* SMB2_TREE_DISCONNECT */ 4,
  70         /* SMB2_CREATE */ 57,
  71         /* SMB2_CLOSE */ 24,
  72         /* SMB2_FLUSH */ 24,
  73         /* SMB2_READ */ 49,
  74         /* SMB2_WRITE */ 49,
  75         /* SMB2_LOCK */ 48,
  76         /* SMB2_IOCTL */ 57,
  77         /* SMB2_CANCEL */ 4,
  78         /* SMB2_ECHO */ 4,
  79         /* SMB2_QUERY_DIRECTORY */ 33,
  80         /* SMB2_CHANGE_NOTIFY */ 32,
  81         /* SMB2_QUERY_INFO */ 41,
  82         /* SMB2_SET_INFO */ 33,
  83         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  84 };
  85
  86 int smb3_encryption_required(const struct cifs_tcon *tcon)
  87 {
  88         if (!tcon)
  89                 return 0;
  90         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  91             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  92                 return 1;
  93         if (tcon->seal &&
  94             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  95                 return 1;
  96         return 0;
  97 }
  98
  99 static void
 100 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
 101                   const struct cifs_tcon *tcon)
 102 {
 103         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 104         shdr->StructureSize = cpu_to_le16(64);
 105         shdr->Command = smb2_cmd;
 106         if (tcon && tcon->ses && tcon->ses->server) {
 107                 struct TCP_Server_Info *server = tcon->ses->server;
 108
 109                 spin_lock(&server->req_lock);
 110                 /* Request up to 10 credits but don't go over the limit. */
 111                 if (server->credits >= server->max_credits)
 112                         shdr->CreditRequest = cpu_to_le16(0);
 113                 else
 114                         shdr->CreditRequest = cpu_to_le16(
 115                                 min_t(int, server->max_credits -
 116                                                 server->credits, 10));
 117                 spin_unlock(&server->req_lock);
 118         } else {
 119                 shdr->CreditRequest = cpu_to_le16(2);
 120         }
 121         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 122
 123         if (!tcon)
 124                 goto out;
 125
 126         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 127         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 128         if ((tcon->ses) && (tcon->ses->server) &&
 129             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 130                 shdr->CreditCharge = cpu_to_le16(1);
 131         /* else CreditCharge MBZ */
 132
 133         shdr->TreeId = tcon->tid;
 134         /* Uid is not converted */
 135         if (tcon->ses)
 136                 shdr->SessionId = tcon->ses->Suid;
 137
 138         /*
 139          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 140          * to pass the path on the Open SMB prefixed by \\server\share.
 141          * Not sure when we would need to do the augmented path (if ever) and
 142          * setting this flag breaks the SMB2 open operation since it is
 143          * illegal to send an empty path name (without \\server\share prefix)
 144          * when the DFS flag is set in the SMB open header. We could
 145          * consider setting the flag on all operations other than open
 146          * but it is safer to net set it for now.
 147          */
 148 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 149                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 150
 151         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
 152             !smb3_encryption_required(tcon))
 153                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 154 out:
 155         return;
 156 }
 157
 158 #ifdef CONFIG_CIFS_DFS_UPCALL
 159 static int __smb2_reconnect(const struct nls_table *nlsc,
 160                             struct cifs_tcon *tcon)
 161 {
 162         int rc;
 163         struct dfs_cache_tgt_list tl;
 164         struct dfs_cache_tgt_iterator *it = NULL;
 165         char *tree;
 166         const char *tcp_host;
 167         size_t tcp_host_len;
 168         const char *dfs_host;
 169         size_t dfs_host_len;
 170
 171         tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL);
 172         if (!tree)
 173                 return -ENOMEM;
 174
 175         if (tcon->ipc) {
 176                 scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$",
 177                           tcon->ses->server->hostname);
 178                 rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
 179                 goto out;
 180         }
 181
 182         if (!tcon->dfs_path) {
 183                 rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
 184                 goto out;
 185         }
 186
 187         rc = dfs_cache_noreq_find(tcon->dfs_path + 1, NULL, &tl);
 188         if (rc)
 189                 goto out;
 190
 191         extract_unc_hostname(tcon->ses->server->hostname, &tcp_host,
 192                              &tcp_host_len);
 193
 194         for (it = dfs_cache_get_tgt_iterator(&tl); it;
 195              it = dfs_cache_get_next_tgt(&tl, it)) {
 196                 const char *tgt = dfs_cache_get_tgt_name(it);
 197
 198                 extract_unc_hostname(tgt, &dfs_host, &dfs_host_len);
 199
 200                 if (dfs_host_len != tcp_host_len
 201                     || strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) {
 202                         cifs_dbg(FYI, "%s: skipping %.*s, doesn't match %.*s",
 203                                  __func__,
 204                                  (int)dfs_host_len, dfs_host,
 205                                  (int)tcp_host_len, tcp_host);
 206                         continue;
 207                 }
 208
 209                 scnprintf(tree, MAX_TREE_SIZE, "\\%s", tgt);
 210
 211                 rc = SMB2_tcon(0, tcon->ses, tree, tcon, nlsc);
 212                 if (!rc)
 213                         break;
 214                 if (rc == -EREMOTE)
 215                         break;
 216         }
 217
 218         if (!rc) {
 219                 if (it)
 220                         rc = dfs_cache_noreq_update_tgthint(tcon->dfs_path + 1,
 221                                                             it);
 222                 else
 223                         rc = -ENOENT;
 224         }
 225         dfs_cache_free_tgts(&tl);
 226 out:
 227         kfree(tree);
 228         return rc;
 229 }
 230 #else
 231 static inline int __smb2_reconnect(const struct nls_table *nlsc,
 232                                    struct cifs_tcon *tcon)
 233 {
 234         return SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nlsc);
 235 }
 236 #endif
 237
 238 static int
 239 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 240 {
 241         int rc;
 242         struct nls_table *nls_codepage;
 243         struct cifs_ses *ses;
 244         struct TCP_Server_Info *server;
 245         int retries;
 246
 247         /*
 248          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 249          * check for tcp and smb session status done differently
 250          * for those three - in the calling routine.
 251          */
 252         if (tcon == NULL)
 253                 return 0;
 254
 255         if (smb2_command == SMB2_TREE_CONNECT)
 256                 return 0;
 257
 258         if (tcon->tidStatus == CifsExiting) {
 259                 /*
 260                  * only tree disconnect, open, and write,
 261                  * (and ulogoff which does not have tcon)
 262                  * are allowed as we start force umount.
 263                  */
 264                 if ((smb2_command != SMB2_WRITE) &&
 265                    (smb2_command != SMB2_CREATE) &&
 266                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 267                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 268                                  smb2_command);
 269                         return -ENODEV;
 270                 }
 271         }
 272         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 273             (!tcon->ses->server))
 274                 return -EIO;
 275
 276         ses = tcon->ses;
 277         server = ses->server;
 278
 279         retries = server->nr_targets;
 280
 281         /*
 282          * Give demultiplex thread up to 10 seconds to each target available for
 283          * reconnect -- should be greater than cifs socket timeout which is 7
 284          * seconds.
 285          */
 286         while (server->tcpStatus == CifsNeedReconnect) {
 287                 /*
 288                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 289                  * here since they are implicitly done when session drops.
 290                  */
 291                 switch (smb2_command) {
 292                 /*
 293                  * BB Should we keep oplock break and add flush to exceptions?
 294                  */
 295                 case SMB2_TREE_DISCONNECT:
 296                 case SMB2_CANCEL:
 297                 case SMB2_CLOSE:
 298                 case SMB2_OPLOCK_BREAK:
 299                         return -EAGAIN;
 300                 }
 301
 302                 rc = wait_event_interruptible_timeout(server->response_q,
 303                                                       (server->tcpStatus != CifsNeedReconnect),
 304                                                       10 * HZ);
 305                 if (rc < 0) {
 306                         cifs_dbg(FYI, "%s: aborting reconnect due to a received"
 307                                  " signal by the process\n", __func__);
 308                         return -ERESTARTSYS;
 309                 }
 310
 311                 /* are we still trying to reconnect? */
 312                 if (server->tcpStatus != CifsNeedReconnect)
 313                         break;
 314
 315                 if (retries && --retries)
 316                         continue;
 317
 318                 /*
 319                  * on "soft" mounts we wait once. Hard mounts keep
 320                  * retrying until process is killed or server comes
 321                  * back on-line
 322                  */
 323                 if (!tcon->retry) {
 324                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 325                         return -EHOSTDOWN;
 326                 }
 327                 retries = server->nr_targets;
 328         }
 329
 330         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 331                 return 0;
 332
 333         nls_codepage = load_nls_default();
 334
 335         /*
 336          * need to prevent multiple threads trying to simultaneously reconnect
 337          * the same SMB session
 338          */
 339         mutex_lock(&tcon->ses->session_mutex);
 340
 341         /*
 342          * Recheck after acquire mutex. If another thread is negotiating
 343          * and the server never sends an answer the socket will be closed
 344          * and tcpStatus set to reconnect.
 345          */
 346         if (server->tcpStatus == CifsNeedReconnect) {
 347                 rc = -EHOSTDOWN;
 348                 mutex_unlock(&tcon->ses->session_mutex);
 349                 goto out;
 350         }
 351
 352         rc = cifs_negotiate_protocol(0, tcon->ses);
 353         if (!rc && tcon->ses->need_reconnect)
 354                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 355
 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 __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 430                                   void **request_buf, unsigned int *total_len)
 431 {
 432         /* BB eventually switch this to SMB2 specific small buf size */
 433         if (smb2_command == SMB2_SET_INFO)
 434                 *request_buf = cifs_buf_get();
 435         else
 436                 *request_buf = cifs_small_buf_get();
 437         if (*request_buf == NULL) {
 438                 /* BB should we add a retry in here if not a writepage? */
 439                 return -ENOMEM;
 440         }
 441
 442         fill_small_buf(smb2_command, tcon,
 443                        (struct smb2_sync_hdr *)(*request_buf),
 444                        total_len);
 445
 446         if (tcon != NULL) {
 447                 uint16_t com_code = le16_to_cpu(smb2_command);
 448                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 449                 cifs_stats_inc(&tcon->num_smbs_sent);
 450         }
 451
 452         return 0;
 453 }
 454
 455 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 456                                void **request_buf, unsigned int *total_len)
 457 {
 458         int rc;
 459
 460         rc = smb2_reconnect(smb2_command, tcon);
 461         if (rc)
 462                 return rc;
 463
 464         return __smb2_plain_req_init(smb2_command, tcon, request_buf,
 465                                      total_len);
 466 }
 467
 468 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 469                                void **request_buf, unsigned int *total_len)
 470 {
 471         /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
 472         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
 473                 return __smb2_plain_req_init(SMB2_IOCTL, tcon, request_buf,
 474                                              total_len);
 475         }
 476         return smb2_plain_req_init(SMB2_IOCTL, tcon, request_buf, total_len);
 477 }
 478
 479 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 480
 481 static void
 482 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 483 {
 484         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 485         pneg_ctxt->DataLength = cpu_to_le16(38);
 486         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 487         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 488         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 489         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 490 }
 491
 492 static void
 493 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 494 {
 495         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 496         pneg_ctxt->DataLength =
 497                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 498                           - sizeof(struct smb2_neg_context));
 499         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 500         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 501         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 502         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 503 }
 504
 505 static void
 506 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 507 {
 508         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 509         pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + two ciphers */
 510         pneg_ctxt->CipherCount = cpu_to_le16(2);
 511         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 512         pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 513 }
 514
 515 static unsigned int
 516 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 517 {
 518         struct nls_table *cp = load_nls_default();
 519
 520         pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 521
 522         /* copy up to max of first 100 bytes of server name to NetName field */
 523         pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 524         /* context size is DataLength + minimal smb2_neg_context */
 525         return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
 526                         sizeof(struct smb2_neg_context), 8) * 8;
 527 }
 528
 529 static void
 530 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 531 {
 532         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 533         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 534         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 535         pneg_ctxt->Name[0] = 0x93;
 536         pneg_ctxt->Name[1] = 0xAD;
 537         pneg_ctxt->Name[2] = 0x25;
 538         pneg_ctxt->Name[3] = 0x50;
 539         pneg_ctxt->Name[4] = 0x9C;
 540         pneg_ctxt->Name[5] = 0xB4;
 541         pneg_ctxt->Name[6] = 0x11;
 542         pneg_ctxt->Name[7] = 0xE7;
 543         pneg_ctxt->Name[8] = 0xB4;
 544         pneg_ctxt->Name[9] = 0x23;
 545         pneg_ctxt->Name[10] = 0x83;
 546         pneg_ctxt->Name[11] = 0xDE;
 547         pneg_ctxt->Name[12] = 0x96;
 548         pneg_ctxt->Name[13] = 0x8B;
 549         pneg_ctxt->Name[14] = 0xCD;
 550         pneg_ctxt->Name[15] = 0x7C;
 551 }
 552
 553 static void
 554 assemble_neg_contexts(struct smb2_negotiate_req *req,
 555                       struct TCP_Server_Info *server, unsigned int *total_len)
 556 {
 557         char *pneg_ctxt;
 558         unsigned int ctxt_len;
 559
 560         if (*total_len > 200) {
 561                 /* In case length corrupted don't want to overrun smb buffer */
 562                 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 563                 return;
 564         }
 565
 566         /*
 567          * round up total_len of fixed part of SMB3 negotiate request to 8
 568          * byte boundary before adding negotiate contexts
 569          */
 570         *total_len = roundup(*total_len, 8);
 571
 572         pneg_ctxt = (*total_len) + (char *)req;
 573         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 574
 575         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 576         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 577         *total_len += ctxt_len;
 578         pneg_ctxt += ctxt_len;
 579
 580         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 581         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 582         *total_len += ctxt_len;
 583         pneg_ctxt += ctxt_len;
 584
 585         if (server->compress_algorithm) {
 586                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 587                                 pneg_ctxt);
 588                 ctxt_len = DIV_ROUND_UP(
 589                         sizeof(struct smb2_compression_capabilities_context),
 590                                 8) * 8;
 591                 *total_len += ctxt_len;
 592                 pneg_ctxt += ctxt_len;
 593                 req->NegotiateContextCount = cpu_to_le16(5);
 594         } else
 595                 req->NegotiateContextCount = cpu_to_le16(4);
 596
 597         ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 598                                         server->hostname);
 599         *total_len += ctxt_len;
 600         pneg_ctxt += ctxt_len;
 601
 602         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 603         *total_len += sizeof(struct smb2_posix_neg_context);
 604 }
 605
 606 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 607 {
 608         unsigned int len = le16_to_cpu(ctxt->DataLength);
 609
 610         /* If invalid preauth context warn but use what we requested, SHA-512 */
 611         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 612                 printk_once(KERN_WARNING "server sent bad preauth context\n");
 613                 return;
 614         }
 615         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 616                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
 617         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 618                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
 619 }
 620
 621 static void decode_compress_ctx(struct TCP_Server_Info *server,
 622                          struct smb2_compression_capabilities_context *ctxt)
 623 {
 624         unsigned int len = le16_to_cpu(ctxt->DataLength);
 625
 626         /* sizeof compress context is a one element compression capbility struct */
 627         if (len < 10) {
 628                 printk_once(KERN_WARNING "server sent bad compression cntxt\n");
 629                 return;
 630         }
 631         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 632                 printk_once(KERN_WARNING "illegal SMB3 compress algorithm count\n");
 633                 return;
 634         }
 635         if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 636                 printk_once(KERN_WARNING "unknown compression algorithm\n");
 637                 return;
 638         }
 639         server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 640 }
 641
 642 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 643                               struct smb2_encryption_neg_context *ctxt)
 644 {
 645         unsigned int len = le16_to_cpu(ctxt->DataLength);
 646
 647         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 648         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 649                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
 650                 return -EINVAL;
 651         }
 652
 653         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 654                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
 655                 return -EINVAL;
 656         }
 657         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 658         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 659             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 660                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
 661                 return -EINVAL;
 662         }
 663         server->cipher_type = ctxt->Ciphers[0];
 664         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 665         return 0;
 666 }
 667
 668 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 669                                      struct TCP_Server_Info *server,
 670                                      unsigned int len_of_smb)
 671 {
 672         struct smb2_neg_context *pctx;
 673         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 674         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 675         unsigned int len_of_ctxts, i;
 676         int rc = 0;
 677
 678         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 679         if (len_of_smb <= offset) {
 680                 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 681                 return -EINVAL;
 682         }
 683
 684         len_of_ctxts = len_of_smb - offset;
 685
 686         for (i = 0; i < ctxt_cnt; i++) {
 687                 int clen;
 688                 /* check that offset is not beyond end of SMB */
 689                 if (len_of_ctxts == 0)
 690                         break;
 691
 692                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 693                         break;
 694
 695                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 696                 clen = le16_to_cpu(pctx->DataLength);
 697                 if (clen > len_of_ctxts)
 698                         break;
 699
 700                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 701                         decode_preauth_context(
 702                                 (struct smb2_preauth_neg_context *)pctx);
 703                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 704                         rc = decode_encrypt_ctx(server,
 705                                 (struct smb2_encryption_neg_context *)pctx);
 706                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 707                         decode_compress_ctx(server,
 708                                 (struct smb2_compression_capabilities_context *)pctx);
 709                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 710                         server->posix_ext_supported = true;
 711                 else
 712                         cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 713                                 le16_to_cpu(pctx->ContextType));
 714
 715                 if (rc)
 716                         break;
 717                 /* offsets must be 8 byte aligned */
 718                 clen = (clen + 7) & ~0x7;
 719                 offset += clen + sizeof(struct smb2_neg_context);
 720                 len_of_ctxts -= clen;
 721         }
 722         return rc;
 723 }
 724
 725 static struct create_posix *
 726 create_posix_buf(umode_t mode)
 727 {
 728         struct create_posix *buf;
 729
 730         buf = kzalloc(sizeof(struct create_posix),
 731                         GFP_KERNEL);
 732         if (!buf)
 733                 return NULL;
 734
 735         buf->ccontext.DataOffset =
 736                 cpu_to_le16(offsetof(struct create_posix, Mode));
 737         buf->ccontext.DataLength = cpu_to_le32(4);
 738         buf->ccontext.NameOffset =
 739                 cpu_to_le16(offsetof(struct create_posix, Name));
 740         buf->ccontext.NameLength = cpu_to_le16(16);
 741
 742         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 743         buf->Name[0] = 0x93;
 744         buf->Name[1] = 0xAD;
 745         buf->Name[2] = 0x25;
 746         buf->Name[3] = 0x50;
 747         buf->Name[4] = 0x9C;
 748         buf->Name[5] = 0xB4;
 749         buf->Name[6] = 0x11;
 750         buf->Name[7] = 0xE7;
 751         buf->Name[8] = 0xB4;
 752         buf->Name[9] = 0x23;
 753         buf->Name[10] = 0x83;
 754         buf->Name[11] = 0xDE;
 755         buf->Name[12] = 0x96;
 756         buf->Name[13] = 0x8B;
 757         buf->Name[14] = 0xCD;
 758         buf->Name[15] = 0x7C;
 759         buf->Mode = cpu_to_le32(mode);
 760         cifs_dbg(FYI, "mode on posix create 0%o", mode);
 761         return buf;
 762 }
 763
 764 static int
 765 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 766 {
 767         struct smb2_create_req *req = iov[0].iov_base;
 768         unsigned int num = *num_iovec;
 769
 770         iov[num].iov_base = create_posix_buf(mode);
 771         if (mode == ACL_NO_MODE)
 772                 cifs_dbg(FYI, "illegal mode\n");
 773         if (iov[num].iov_base == NULL)
 774                 return -ENOMEM;
 775         iov[num].iov_len = sizeof(struct create_posix);
 776         if (!req->CreateContextsOffset)
 777                 req->CreateContextsOffset = cpu_to_le32(
 778                                 sizeof(struct smb2_create_req) +
 779                                 iov[num - 1].iov_len);
 780         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 781         *num_iovec = num + 1;
 782         return 0;
 783 }
 784
 785
 786 /*
 787  *
 788  *      SMB2 Worker functions follow:
 789  *
 790  *      The general structure of the worker functions is:
 791  *      1) Call smb2_init (assembles SMB2 header)
 792  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 793  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 794  *      4) Decode SMB2 command specific fields in the fixed length area
 795  *      5) Decode variable length data area (if any for this SMB2 command type)
 796  *      6) Call free smb buffer
 797  *      7) return
 798  *
 799  */
 800
 801 int
 802 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 803 {
 804         struct smb_rqst rqst;
 805         struct smb2_negotiate_req *req;
 806         struct smb2_negotiate_rsp *rsp;
 807         struct kvec iov[1];
 808         struct kvec rsp_iov;
 809         int rc = 0;
 810         int resp_buftype;
 811         struct TCP_Server_Info *server = cifs_ses_server(ses);
 812         int blob_offset, blob_length;
 813         char *security_blob;
 814         int flags = CIFS_NEG_OP;
 815         unsigned int total_len;
 816
 817         cifs_dbg(FYI, "Negotiate protocol\n");
 818
 819         if (!server) {
 820                 WARN(1, "%s: server is NULL!\n", __func__);
 821                 return -EIO;
 822         }
 823
 824         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 825         if (rc)
 826                 return rc;
 827
 828         req->sync_hdr.SessionId = 0;
 829
 830         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 831         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 832
 833         if (strcmp(server->vals->version_string,
 834                    SMB3ANY_VERSION_STRING) == 0) {
 835                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 836                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 837                 req->DialectCount = cpu_to_le16(2);
 838                 total_len += 4;
 839         } else if (strcmp(server->vals->version_string,
 840                    SMBDEFAULT_VERSION_STRING) == 0) {
 841                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 842                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 843                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 844                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 845                 req->DialectCount = cpu_to_le16(4);
 846                 total_len += 8;
 847         } else {
 848                 /* otherwise send specific dialect */
 849                 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
 850                 req->DialectCount = cpu_to_le16(1);
 851                 total_len += 2;
 852         }
 853
 854         /* only one of SMB2 signing flags may be set in SMB2 request */
 855         if (ses->sign)
 856                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 857         else if (global_secflags & CIFSSEC_MAY_SIGN)
 858                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 859         else
 860                 req->SecurityMode = 0;
 861
 862         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
 863
 864         /* ClientGUID must be zero for SMB2.02 dialect */
 865         if (server->vals->protocol_id == SMB20_PROT_ID)
 866                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 867         else {
 868                 memcpy(req->ClientGUID, server->client_guid,
 869                         SMB2_CLIENT_GUID_SIZE);
 870                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
 871                     (strcmp(server->vals->version_string,
 872                      SMBDEFAULT_VERSION_STRING) == 0))
 873                         assemble_neg_contexts(req, server, &total_len);
 874         }
 875         iov[0].iov_base = (char *)req;
 876         iov[0].iov_len = total_len;
 877
 878         memset(&rqst, 0, sizeof(struct smb_rqst));
 879         rqst.rq_iov = iov;
 880         rqst.rq_nvec = 1;
 881
 882         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
 883         cifs_small_buf_release(req);
 884         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 885         /*
 886          * No tcon so can't do
 887          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 888          */
 889         if (rc == -EOPNOTSUPP) {
 890                 cifs_server_dbg(VFS, "Dialect not supported by server. Consider "
 891                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 892                         " older servers\n");
 893                 goto neg_exit;
 894         } else if (rc != 0)
 895                 goto neg_exit;
 896
 897         if (strcmp(server->vals->version_string,
 898                    SMB3ANY_VERSION_STRING) == 0) {
 899                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 900                         cifs_server_dbg(VFS,
 901                                 "SMB2 dialect returned but not requested\n");
 902                         return -EIO;
 903                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 904                         cifs_server_dbg(VFS,
 905                                 "SMB2.1 dialect returned but not requested\n");
 906                         return -EIO;
 907                 }
 908         } else if (strcmp(server->vals->version_string,
 909                    SMBDEFAULT_VERSION_STRING) == 0) {
 910                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 911                         cifs_server_dbg(VFS,
 912                                 "SMB2 dialect returned but not requested\n");
 913                         return -EIO;
 914                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 915                         /* ops set to 3.0 by default for default so update */
 916                         server->ops = &smb21_operations;
 917                         server->vals = &smb21_values;
 918                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 919                         server->ops = &smb311_operations;
 920                         server->vals = &smb311_values;
 921                 }
 922         } else if (le16_to_cpu(rsp->DialectRevision) !=
 923                                 server->vals->protocol_id) {
 924                 /* if requested single dialect ensure returned dialect matched */
 925                 cifs_server_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 926                         le16_to_cpu(rsp->DialectRevision));
 927                 return -EIO;
 928         }
 929
 930         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 931
 932         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 933                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 934         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 935                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 936         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 937                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 938         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 939                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 940         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 941                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 942         else {
 943                 cifs_server_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 944                          le16_to_cpu(rsp->DialectRevision));
 945                 rc = -EIO;
 946                 goto neg_exit;
 947         }
 948         server->dialect = le16_to_cpu(rsp->DialectRevision);
 949
 950         /*
 951          * Keep a copy of the hash after negprot. This hash will be
 952          * the starting hash value for all sessions made from this
 953          * server.
 954          */
 955         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 956                SMB2_PREAUTH_HASH_SIZE);
 957
 958         /* SMB2 only has an extended negflavor */
 959         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 960         /* set it to the maximum buffer size value we can send with 1 credit */
 961         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 962                                SMB2_MAX_BUFFER_SIZE);
 963         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 964         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 965         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 966         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 967                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 968                                 server->sec_mode);
 969         server->capabilities = le32_to_cpu(rsp->Capabilities);
 970         /* Internal types */
 971         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 972
 973         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 974                                                (struct smb2_sync_hdr *)rsp);
 975         /*
 976          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 977          * for us will be
 978          *      ses->sectype = RawNTLMSSP;
 979          * but for time being this is our only auth choice so doesn't matter.
 980          * We just found a server which sets blob length to zero expecting raw.
 981          */
 982         if (blob_length == 0) {
 983                 cifs_dbg(FYI, "missing security blob on negprot\n");
 984                 server->sec_ntlmssp = true;
 985         }
 986
 987         rc = cifs_enable_signing(server, ses->sign);
 988         if (rc)
 989                 goto neg_exit;
 990         if (blob_length) {
 991                 rc = decode_negTokenInit(security_blob, blob_length, server);
 992                 if (rc == 1)
 993                         rc = 0;
 994                 else if (rc == 0)
 995                         rc = -EIO;
 996         }
 997
 998         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 999                 if (rsp->NegotiateContextCount)
1000                         rc = smb311_decode_neg_context(rsp, server,
1001                                                        rsp_iov.iov_len);
1002                 else
1003                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
1004         }
1005 neg_exit:
1006         free_rsp_buf(resp_buftype, rsp);
1007         return rc;
1008 }
1009
1010 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1011 {
1012         int rc;
1013         struct validate_negotiate_info_req *pneg_inbuf;
1014         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1015         u32 rsplen;
1016         u32 inbuflen; /* max of 4 dialects */
1017         struct TCP_Server_Info *server = tcon->ses->server;
1018
1019         cifs_dbg(FYI, "validate negotiate\n");
1020
1021         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1022         if (server->dialect == SMB311_PROT_ID)
1023                 return 0;
1024
1025         /*
1026          * validation ioctl must be signed, so no point sending this if we
1027          * can not sign it (ie are not known user).  Even if signing is not
1028          * required (enabled but not negotiated), in those cases we selectively
1029          * sign just this, the first and only signed request on a connection.
1030          * Having validation of negotiate info  helps reduce attack vectors.
1031          */
1032         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1033                 return 0; /* validation requires signing */
1034
1035         if (tcon->ses->user_name == NULL) {
1036                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1037                 return 0; /* validation requires signing */
1038         }
1039
1040         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1041                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1042
1043         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1044         if (!pneg_inbuf)
1045                 return -ENOMEM;
1046
1047         pneg_inbuf->Capabilities =
1048                         cpu_to_le32(server->vals->req_capabilities);
1049         memcpy(pneg_inbuf->Guid, server->client_guid,
1050                                         SMB2_CLIENT_GUID_SIZE);
1051
1052         if (tcon->ses->sign)
1053                 pneg_inbuf->SecurityMode =
1054                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1055         else if (global_secflags & CIFSSEC_MAY_SIGN)
1056                 pneg_inbuf->SecurityMode =
1057                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1058         else
1059                 pneg_inbuf->SecurityMode = 0;
1060
1061
1062         if (strcmp(server->vals->version_string,
1063                 SMB3ANY_VERSION_STRING) == 0) {
1064                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1065                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1066                 pneg_inbuf->DialectCount = cpu_to_le16(2);
1067                 /* structure is big enough for 3 dialects, sending only 2 */
1068                 inbuflen = sizeof(*pneg_inbuf) -
1069                                 (2 * sizeof(pneg_inbuf->Dialects[0]));
1070         } else if (strcmp(server->vals->version_string,
1071                 SMBDEFAULT_VERSION_STRING) == 0) {
1072                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1073                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1074                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1075                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1076                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1077                 /* structure is big enough for 3 dialects */
1078                 inbuflen = sizeof(*pneg_inbuf);
1079         } else {
1080                 /* otherwise specific dialect was requested */
1081                 pneg_inbuf->Dialects[0] =
1082                         cpu_to_le16(server->vals->protocol_id);
1083                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1084                 /* structure is big enough for 3 dialects, sending only 1 */
1085                 inbuflen = sizeof(*pneg_inbuf) -
1086                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
1087         }
1088
1089         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1090                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1091                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1092                 (char **)&pneg_rsp, &rsplen);
1093         if (rc == -EOPNOTSUPP) {
1094                 /*
1095                  * Old Windows versions or Netapp SMB server can return
1096                  * not supported error. Client should accept it.
1097                  */
1098                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1099                 rc = 0;
1100                 goto out_free_inbuf;
1101         } else if (rc != 0) {
1102                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
1103                 rc = -EIO;
1104                 goto out_free_inbuf;
1105         }
1106
1107         rc = -EIO;
1108         if (rsplen != sizeof(*pneg_rsp)) {
1109                 cifs_tcon_dbg(VFS, "invalid protocol negotiate response size: %d\n",
1110                          rsplen);
1111
1112                 /* relax check since Mac returns max bufsize allowed on ioctl */
1113                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1114                         goto out_free_rsp;
1115         }
1116
1117         /* check validate negotiate info response matches what we got earlier */
1118         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1119                 goto vneg_out;
1120
1121         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1122                 goto vneg_out;
1123
1124         /* do not validate server guid because not saved at negprot time yet */
1125
1126         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1127               SMB2_LARGE_FILES) != server->capabilities)
1128                 goto vneg_out;
1129
1130         /* validate negotiate successful */
1131         rc = 0;
1132         cifs_dbg(FYI, "validate negotiate info successful\n");
1133         goto out_free_rsp;
1134
1135 vneg_out:
1136         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1137 out_free_rsp:
1138         kfree(pneg_rsp);
1139 out_free_inbuf:
1140         kfree(pneg_inbuf);
1141         return rc;
1142 }
1143
1144 enum securityEnum
1145 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1146 {
1147         switch (requested) {
1148         case Kerberos:
1149         case RawNTLMSSP:
1150                 return requested;
1151         case NTLMv2:
1152                 return RawNTLMSSP;
1153         case Unspecified:
1154                 if (server->sec_ntlmssp &&
1155                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1156                         return RawNTLMSSP;
1157                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1158                         (global_secflags & CIFSSEC_MAY_KRB5))
1159                         return Kerberos;
1160                 /* Fallthrough */
1161         default:
1162                 return Unspecified;
1163         }
1164 }
1165
1166 struct SMB2_sess_data {
1167         unsigned int xid;
1168         struct cifs_ses *ses;
1169         struct nls_table *nls_cp;
1170         void (*func)(struct SMB2_sess_data *);
1171         int result;
1172         u64 previous_session;
1173
1174         /* we will send the SMB in three pieces:
1175          * a fixed length beginning part, an optional
1176          * SPNEGO blob (which can be zero length), and a
1177          * last part which will include the strings
1178          * and rest of bcc area. This allows us to avoid
1179          * a large buffer 17K allocation
1180          */
1181         int buf0_type;
1182         struct kvec iov[2];
1183 };
1184
1185 static int
1186 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1187 {
1188         int rc;
1189         struct cifs_ses *ses = sess_data->ses;
1190         struct smb2_sess_setup_req *req;
1191         struct TCP_Server_Info *server = cifs_ses_server(ses);
1192         unsigned int total_len;
1193
1194         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
1195                              &total_len);
1196         if (rc)
1197                 return rc;
1198
1199         if (sess_data->ses->binding) {
1200                 req->sync_hdr.SessionId = sess_data->ses->Suid;
1201                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1202                 req->PreviousSessionId = 0;
1203                 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1204         } else {
1205                 /* First session, not a reauthenticate */
1206                 req->sync_hdr.SessionId = 0;
1207                 /*
1208                  * if reconnect, we need to send previous sess id
1209                  * otherwise it is 0
1210                  */
1211                 req->PreviousSessionId = sess_data->previous_session;
1212                 req->Flags = 0; /* MBZ */
1213         }
1214
1215         /* enough to enable echos and oplocks and one max size write */
1216         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1217
1218         /* only one of SMB2 signing flags may be set in SMB2 request */
1219         if (server->sign)
1220                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1221         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1222                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1223         else
1224                 req->SecurityMode = 0;
1225
1226 #ifdef CONFIG_CIFS_DFS_UPCALL
1227         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1228 #else
1229         req->Capabilities = 0;
1230 #endif /* DFS_UPCALL */
1231
1232         req->Channel = 0; /* MBZ */
1233
1234         sess_data->iov[0].iov_base = (char *)req;
1235         /* 1 for pad */
1236         sess_data->iov[0].iov_len = total_len - 1;
1237         /*
1238          * This variable will be used to clear the buffer
1239          * allocated above in case of any error in the calling function.
1240          */
1241         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1242
1243         return 0;
1244 }
1245
1246 static void
1247 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1248 {
1249         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1250         sess_data->buf0_type = CIFS_NO_BUFFER;
1251 }
1252
1253 static int
1254 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1255 {
1256         int rc;
1257         struct smb_rqst rqst;
1258         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1259         struct kvec rsp_iov = { NULL, 0 };
1260
1261         /* Testing shows that buffer offset must be at location of Buffer[0] */
1262         req->SecurityBufferOffset =
1263                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1264         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1265
1266         memset(&rqst, 0, sizeof(struct smb_rqst));
1267         rqst.rq_iov = sess_data->iov;
1268         rqst.rq_nvec = 2;
1269
1270         /* BB add code to build os and lm fields */
1271         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1272                             &rqst,
1273                             &sess_data->buf0_type,
1274                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1275         cifs_small_buf_release(sess_data->iov[0].iov_base);
1276         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1277
1278         return rc;
1279 }
1280
1281 static int
1282 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1283 {
1284         int rc = 0;
1285         struct cifs_ses *ses = sess_data->ses;
1286         struct TCP_Server_Info *server = cifs_ses_server(ses);
1287
1288         mutex_lock(&server->srv_mutex);
1289         if (server->ops->generate_signingkey) {
1290                 rc = server->ops->generate_signingkey(ses);
1291                 if (rc) {
1292                         cifs_dbg(FYI,
1293                                 "SMB3 session key generation failed\n");
1294                         mutex_unlock(&server->srv_mutex);
1295                         return rc;
1296                 }
1297         }
1298         if (!server->session_estab) {
1299                 server->sequence_number = 0x2;
1300                 server->session_estab = true;
1301         }
1302         mutex_unlock(&server->srv_mutex);
1303
1304         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1305         /* keep existing ses state if binding */
1306         if (!ses->binding) {
1307                 spin_lock(&GlobalMid_Lock);
1308                 ses->status = CifsGood;
1309                 ses->need_reconnect = false;
1310                 spin_unlock(&GlobalMid_Lock);
1311         }
1312
1313         return rc;
1314 }
1315
1316 #ifdef CONFIG_CIFS_UPCALL
1317 static void
1318 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1319 {
1320         int rc;
1321         struct cifs_ses *ses = sess_data->ses;
1322         struct cifs_spnego_msg *msg;
1323         struct key *spnego_key = NULL;
1324         struct smb2_sess_setup_rsp *rsp = NULL;
1325
1326         rc = SMB2_sess_alloc_buffer(sess_data);
1327         if (rc)
1328                 goto out;
1329
1330         spnego_key = cifs_get_spnego_key(ses);
1331         if (IS_ERR(spnego_key)) {
1332                 rc = PTR_ERR(spnego_key);
1333                 spnego_key = NULL;
1334                 goto out;
1335         }
1336
1337         msg = spnego_key->payload.data[0];
1338         /*
1339          * check version field to make sure that cifs.upcall is
1340          * sending us a response in an expected form
1341          */
1342         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1343                 cifs_dbg(VFS,
1344                           "bad cifs.upcall version. Expected %d got %d",
1345                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1346                 rc = -EKEYREJECTED;
1347                 goto out_put_spnego_key;
1348         }
1349
1350         /* keep session key if binding */
1351         if (!ses->binding) {
1352                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1353                                                  GFP_KERNEL);
1354                 if (!ses->auth_key.response) {
1355                         cifs_dbg(VFS,
1356                                  "Kerberos can't allocate (%u bytes) memory",
1357                                  msg->sesskey_len);
1358                         rc = -ENOMEM;
1359                         goto out_put_spnego_key;
1360                 }
1361                 ses->auth_key.len = msg->sesskey_len;
1362         }
1363
1364         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1365         sess_data->iov[1].iov_len = msg->secblob_len;
1366
1367         rc = SMB2_sess_sendreceive(sess_data);
1368         if (rc)
1369                 goto out_put_spnego_key;
1370
1371         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1372         /* keep session id and flags if binding */
1373         if (!ses->binding) {
1374                 ses->Suid = rsp->sync_hdr.SessionId;
1375                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1376         }
1377
1378         rc = SMB2_sess_establish_session(sess_data);
1379 out_put_spnego_key:
1380         key_invalidate(spnego_key);
1381         key_put(spnego_key);
1382 out:
1383         sess_data->result = rc;
1384         sess_data->func = NULL;
1385         SMB2_sess_free_buffer(sess_data);
1386 }
1387 #else
1388 static void
1389 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1390 {
1391         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1392         sess_data->result = -EOPNOTSUPP;
1393         sess_data->func = NULL;
1394 }
1395 #endif
1396
1397 static void
1398 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1399
1400 static void
1401 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1402 {
1403         int rc;
1404         struct cifs_ses *ses = sess_data->ses;
1405         struct smb2_sess_setup_rsp *rsp = NULL;
1406         char *ntlmssp_blob = NULL;
1407         bool use_spnego = false; /* else use raw ntlmssp */
1408         u16 blob_length = 0;
1409
1410         /*
1411          * If memory allocation is successful, caller of this function
1412          * frees it.
1413          */
1414         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1415         if (!ses->ntlmssp) {
1416                 rc = -ENOMEM;
1417                 goto out_err;
1418         }
1419         ses->ntlmssp->sesskey_per_smbsess = true;
1420
1421         rc = SMB2_sess_alloc_buffer(sess_data);
1422         if (rc)
1423                 goto out_err;
1424
1425         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1426                                GFP_KERNEL);
1427         if (ntlmssp_blob == NULL) {
1428                 rc = -ENOMEM;
1429                 goto out;
1430         }
1431
1432         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1433         if (use_spnego) {
1434                 /* BB eventually need to add this */
1435                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1436                 rc = -EOPNOTSUPP;
1437                 goto out;
1438         } else {
1439                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1440                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1441         }
1442         sess_data->iov[1].iov_base = ntlmssp_blob;
1443         sess_data->iov[1].iov_len = blob_length;
1444
1445         rc = SMB2_sess_sendreceive(sess_data);
1446         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1447
1448         /* If true, rc here is expected and not an error */
1449         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1450                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1451                 rc = 0;
1452
1453         if (rc)
1454                 goto out;
1455
1456         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1457                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1458                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1459                         le16_to_cpu(rsp->SecurityBufferOffset));
1460                 rc = -EIO;
1461                 goto out;
1462         }
1463         rc = decode_ntlmssp_challenge(rsp->Buffer,
1464                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1465         if (rc)
1466                 goto out;
1467
1468         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1469
1470         /* keep existing ses id and flags if binding */
1471         if (!ses->binding) {
1472                 ses->Suid = rsp->sync_hdr.SessionId;
1473                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1474         }
1475
1476 out:
1477         kfree(ntlmssp_blob);
1478         SMB2_sess_free_buffer(sess_data);
1479         if (!rc) {
1480                 sess_data->result = 0;
1481                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1482                 return;
1483         }
1484 out_err:
1485         kfree(ses->ntlmssp);
1486         ses->ntlmssp = NULL;
1487         sess_data->result = rc;
1488         sess_data->func = NULL;
1489 }
1490
1491 static void
1492 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1493 {
1494         int rc;
1495         struct cifs_ses *ses = sess_data->ses;
1496         struct smb2_sess_setup_req *req;
1497         struct smb2_sess_setup_rsp *rsp = NULL;
1498         unsigned char *ntlmssp_blob = NULL;
1499         bool use_spnego = false; /* else use raw ntlmssp */
1500         u16 blob_length = 0;
1501
1502         rc = SMB2_sess_alloc_buffer(sess_data);
1503         if (rc)
1504                 goto out;
1505
1506         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1507         req->sync_hdr.SessionId = ses->Suid;
1508
1509         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1510                                         sess_data->nls_cp);
1511         if (rc) {
1512                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1513                 goto out;
1514         }
1515
1516         if (use_spnego) {
1517                 /* BB eventually need to add this */
1518                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1519                 rc = -EOPNOTSUPP;
1520                 goto out;
1521         }
1522         sess_data->iov[1].iov_base = ntlmssp_blob;
1523         sess_data->iov[1].iov_len = blob_length;
1524
1525         rc = SMB2_sess_sendreceive(sess_data);
1526         if (rc)
1527                 goto out;
1528
1529         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1530
1531         /* keep existing ses id and flags if binding */
1532         if (!ses->binding) {
1533                 ses->Suid = rsp->sync_hdr.SessionId;
1534                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1535         }
1536
1537         rc = SMB2_sess_establish_session(sess_data);
1538 out:
1539         kfree(ntlmssp_blob);
1540         SMB2_sess_free_buffer(sess_data);
1541         kfree(ses->ntlmssp);
1542         ses->ntlmssp = NULL;
1543         sess_data->result = rc;
1544         sess_data->func = NULL;
1545 }
1546
1547 static int
1548 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1549 {
1550         int type;
1551
1552         type = smb2_select_sectype(cifs_ses_server(ses), ses->sectype);
1553         cifs_dbg(FYI, "sess setup type %d\n", type);
1554         if (type == Unspecified) {
1555                 cifs_dbg(VFS,
1556                         "Unable to select appropriate authentication method!");
1557                 return -EINVAL;
1558         }
1559
1560         switch (type) {
1561         case Kerberos:
1562                 sess_data->func = SMB2_auth_kerberos;
1563                 break;
1564         case RawNTLMSSP:
1565                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1566                 break;
1567         default:
1568                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1569                 return -EOPNOTSUPP;
1570         }
1571
1572         return 0;
1573 }
1574
1575 int
1576 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1577                 const struct nls_table *nls_cp)
1578 {
1579         int rc = 0;
1580         struct TCP_Server_Info *server = cifs_ses_server(ses);
1581         struct SMB2_sess_data *sess_data;
1582
1583         cifs_dbg(FYI, "Session Setup\n");
1584
1585         if (!server) {
1586                 WARN(1, "%s: server is NULL!\n", __func__);
1587                 return -EIO;
1588         }
1589
1590         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1591         if (!sess_data)
1592                 return -ENOMEM;
1593
1594         rc = SMB2_select_sec(ses, sess_data);
1595         if (rc)
1596                 goto out;
1597         sess_data->xid = xid;
1598         sess_data->ses = ses;
1599         sess_data->buf0_type = CIFS_NO_BUFFER;
1600         sess_data->nls_cp = (struct nls_table *) nls_cp;
1601         sess_data->previous_session = ses->Suid;
1602
1603         /*
1604          * Initialize the session hash with the server one.
1605          */
1606         memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1607                SMB2_PREAUTH_HASH_SIZE);
1608
1609         while (sess_data->func)
1610                 sess_data->func(sess_data);
1611
1612         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1613                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1614         rc = sess_data->result;
1615 out:
1616         kfree(sess_data);
1617         return rc;
1618 }
1619
1620 int
1621 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1622 {
1623         struct smb_rqst rqst;
1624         struct smb2_logoff_req *req; /* response is also trivial struct */
1625         int rc = 0;
1626         struct TCP_Server_Info *server;
1627         int flags = 0;
1628         unsigned int total_len;
1629         struct kvec iov[1];
1630         struct kvec rsp_iov;
1631         int resp_buf_type;
1632
1633         cifs_dbg(FYI, "disconnect session %p\n", ses);
1634
1635         if (ses && (ses->server))
1636                 server = ses->server;
1637         else
1638                 return -EIO;
1639
1640         /* no need to send SMB logoff if uid already closed due to reconnect */
1641         if (ses->need_reconnect)
1642                 goto smb2_session_already_dead;
1643
1644         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1645         if (rc)
1646                 return rc;
1647
1648          /* since no tcon, smb2_init can not do this, so do here */
1649         req->sync_hdr.SessionId = ses->Suid;
1650
1651         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1652                 flags |= CIFS_TRANSFORM_REQ;
1653         else if (server->sign)
1654                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1655
1656         flags |= CIFS_NO_RSP_BUF;
1657
1658         iov[0].iov_base = (char *)req;
1659         iov[0].iov_len = total_len;
1660
1661         memset(&rqst, 0, sizeof(struct smb_rqst));
1662         rqst.rq_iov = iov;
1663         rqst.rq_nvec = 1;
1664
1665         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1666         cifs_small_buf_release(req);
1667         /*
1668          * No tcon so can't do
1669          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1670          */
1671
1672 smb2_session_already_dead:
1673         return rc;
1674 }
1675
1676 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1677 {
1678         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1679 }
1680
1681 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1682
1683 /* These are similar values to what Windows uses */
1684 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1685 {
1686         tcon->max_chunks = 256;
1687         tcon->max_bytes_chunk = 1048576;
1688         tcon->max_bytes_copy = 16777216;
1689 }
1690
1691 int
1692 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1693           struct cifs_tcon *tcon, const struct nls_table *cp)
1694 {
1695         struct smb_rqst rqst;
1696         struct smb2_tree_connect_req *req;
1697         struct smb2_tree_connect_rsp *rsp = NULL;
1698         struct kvec iov[2];
1699         struct kvec rsp_iov = { NULL, 0 };
1700         int rc = 0;
1701         int resp_buftype;
1702         int unc_path_len;
1703         __le16 *unc_path = NULL;
1704         int flags = 0;
1705         unsigned int total_len;
1706         struct TCP_Server_Info *server = ses->server;
1707
1708         cifs_dbg(FYI, "TCON\n");
1709
1710         if (!server || !tree)
1711                 return -EIO;
1712
1713         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1714         if (unc_path == NULL)
1715                 return -ENOMEM;
1716
1717         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1718         unc_path_len *= 2;
1719         if (unc_path_len < 2) {
1720                 kfree(unc_path);
1721                 return -EINVAL;
1722         }
1723
1724         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1725         tcon->tid = 0;
1726         atomic_set(&tcon->num_remote_opens, 0);
1727         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1728                              &total_len);
1729         if (rc) {
1730                 kfree(unc_path);
1731                 return rc;
1732         }
1733
1734         if (smb3_encryption_required(tcon))
1735                 flags |= CIFS_TRANSFORM_REQ;
1736
1737         iov[0].iov_base = (char *)req;
1738         /* 1 for pad */
1739         iov[0].iov_len = total_len - 1;
1740
1741         /* Testing shows that buffer offset must be at location of Buffer[0] */
1742         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1743                         - 1 /* pad */);
1744         req->PathLength = cpu_to_le16(unc_path_len - 2);
1745         iov[1].iov_base = unc_path;
1746         iov[1].iov_len = unc_path_len;
1747
1748         /*
1749          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1750          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1751          * (Samba servers don't always set the flag so also check if null user)
1752          */
1753         if ((server->dialect == SMB311_PROT_ID) &&
1754             !smb3_encryption_required(tcon) &&
1755             !(ses->session_flags &
1756                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1757             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1758                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1759
1760         memset(&rqst, 0, sizeof(struct smb_rqst));
1761         rqst.rq_iov = iov;
1762         rqst.rq_nvec = 2;
1763
1764         /* Need 64 for max size write so ask for more in case not there yet */
1765         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1766
1767         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1768         cifs_small_buf_release(req);
1769         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1770         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1771         if (rc != 0) {
1772                 if (tcon) {
1773                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1774                         tcon->need_reconnect = true;
1775                 }
1776                 goto tcon_error_exit;
1777         }
1778
1779         switch (rsp->ShareType) {
1780         case SMB2_SHARE_TYPE_DISK:
1781                 cifs_dbg(FYI, "connection to disk share\n");
1782                 break;
1783         case SMB2_SHARE_TYPE_PIPE:
1784                 tcon->pipe = true;
1785                 cifs_dbg(FYI, "connection to pipe share\n");
1786                 break;
1787         case SMB2_SHARE_TYPE_PRINT:
1788                 tcon->print = true;
1789                 cifs_dbg(FYI, "connection to printer\n");
1790                 break;
1791         default:
1792                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1793                 rc = -EOPNOTSUPP;
1794                 goto tcon_error_exit;
1795         }
1796
1797         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1798         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1799         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1800         tcon->tidStatus = CifsGood;
1801         tcon->need_reconnect = false;
1802         tcon->tid = rsp->sync_hdr.TreeId;
1803         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1804
1805         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1806             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1807                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1808
1809         if (tcon->seal &&
1810             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1811                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1812
1813         init_copy_chunk_defaults(tcon);
1814         if (server->ops->validate_negotiate)
1815                 rc = server->ops->validate_negotiate(xid, tcon);
1816 tcon_exit:
1817
1818         free_rsp_buf(resp_buftype, rsp);
1819         kfree(unc_path);
1820         return rc;
1821
1822 tcon_error_exit:
1823         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1824                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1825         }
1826         goto tcon_exit;
1827 }
1828
1829 int
1830 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1831 {
1832         struct smb_rqst rqst;
1833         struct smb2_tree_disconnect_req *req; /* response is trivial */
1834         int rc = 0;
1835         struct cifs_ses *ses = tcon->ses;
1836         int flags = 0;
1837         unsigned int total_len;
1838         struct kvec iov[1];
1839         struct kvec rsp_iov;
1840         int resp_buf_type;
1841
1842         cifs_dbg(FYI, "Tree Disconnect\n");
1843
1844         if (!ses || !(ses->server))
1845                 return -EIO;
1846
1847         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1848                 return 0;
1849
1850         close_shroot_lease(&tcon->crfid);
1851
1852         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1853                              &total_len);
1854         if (rc)
1855                 return rc;
1856
1857         if (smb3_encryption_required(tcon))
1858                 flags |= CIFS_TRANSFORM_REQ;
1859
1860         flags |= CIFS_NO_RSP_BUF;
1861
1862         iov[0].iov_base = (char *)req;
1863         iov[0].iov_len = total_len;
1864
1865         memset(&rqst, 0, sizeof(struct smb_rqst));
1866         rqst.rq_iov = iov;
1867         rqst.rq_nvec = 1;
1868
1869         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1870         cifs_small_buf_release(req);
1871         if (rc)
1872                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1873
1874         return rc;
1875 }
1876
1877
1878 static struct create_durable *
1879 create_durable_buf(void)
1880 {
1881         struct create_durable *buf;
1882
1883         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1884         if (!buf)
1885                 return NULL;
1886
1887         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1888                                         (struct create_durable, Data));
1889         buf->ccontext.DataLength = cpu_to_le32(16);
1890         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1891                                 (struct create_durable, Name));
1892         buf->ccontext.NameLength = cpu_to_le16(4);
1893         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1894         buf->Name[0] = 'D';
1895         buf->Name[1] = 'H';
1896         buf->Name[2] = 'n';
1897         buf->Name[3] = 'Q';
1898         return buf;
1899 }
1900
1901 static struct create_durable *
1902 create_reconnect_durable_buf(struct cifs_fid *fid)
1903 {
1904         struct create_durable *buf;
1905
1906         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1907         if (!buf)
1908                 return NULL;
1909
1910         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1911                                         (struct create_durable, Data));
1912         buf->ccontext.DataLength = cpu_to_le32(16);
1913         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1914                                 (struct create_durable, Name));
1915         buf->ccontext.NameLength = cpu_to_le16(4);
1916         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1917         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1918         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1919         buf->Name[0] = 'D';
1920         buf->Name[1] = 'H';
1921         buf->Name[2] = 'n';
1922         buf->Name[3] = 'C';
1923         return buf;
1924 }
1925
1926 static void
1927 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
1928 {
1929         struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
1930
1931         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
1932                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
1933         buf->IndexNumber = pdisk_id->DiskFileId;
1934 }
1935
1936 void
1937 smb2_parse_contexts(struct TCP_Server_Info *server,
1938                        struct smb2_create_rsp *rsp,
1939                        unsigned int *epoch, char *lease_key, __u8 *oplock,
1940                        struct smb2_file_all_info *buf)
1941 {
1942         char *data_offset;
1943         struct create_context *cc;
1944         unsigned int next;
1945         unsigned int remaining;
1946         char *name;
1947
1948         *oplock = 0;
1949         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1950         remaining = le32_to_cpu(rsp->CreateContextsLength);
1951         cc = (struct create_context *)data_offset;
1952
1953         /* Initialize inode number to 0 in case no valid data in qfid context */
1954         if (buf)
1955                 buf->IndexNumber = 0;
1956
1957         while (remaining >= sizeof(struct create_context)) {
1958                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1959                 if (le16_to_cpu(cc->NameLength) == 4 &&
1960                     strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
1961                         *oplock = server->ops->parse_lease_buf(cc, epoch,
1962                                                            lease_key);
1963                 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
1964                     strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
1965                         parse_query_id_ctxt(cc, buf);
1966
1967                 next = le32_to_cpu(cc->Next);
1968                 if (!next)
1969                         break;
1970                 remaining -= next;
1971                 cc = (struct create_context *)((char *)cc + next);
1972         }
1973
1974         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
1975                 *oplock = rsp->OplockLevel;
1976
1977         return;
1978 }
1979
1980 static int
1981 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1982                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1983 {
1984         struct smb2_create_req *req = iov[0].iov_base;
1985         unsigned int num = *num_iovec;
1986
1987         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1988         if (iov[num].iov_base == NULL)
1989                 return -ENOMEM;
1990         iov[num].iov_len = server->vals->create_lease_size;
1991         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1992         if (!req->CreateContextsOffset)
1993                 req->CreateContextsOffset = cpu_to_le32(
1994                                 sizeof(struct smb2_create_req) +
1995                                 iov[num - 1].iov_len);
1996         le32_add_cpu(&req->CreateContextsLength,
1997                      server->vals->create_lease_size);
1998         *num_iovec = num + 1;
1999         return 0;
2000 }
2001
2002 static struct create_durable_v2 *
2003 create_durable_v2_buf(struct cifs_open_parms *oparms)
2004 {
2005         struct cifs_fid *pfid = oparms->fid;
2006         struct create_durable_v2 *buf;
2007
2008         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2009         if (!buf)
2010                 return NULL;
2011
2012         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2013                                         (struct create_durable_v2, dcontext));
2014         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2015         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2016                                 (struct create_durable_v2, Name));
2017         buf->ccontext.NameLength = cpu_to_le16(4);
2018
2019         /*
2020          * NB: Handle timeout defaults to 0, which allows server to choose
2021          * (most servers default to 120 seconds) and most clients default to 0.
2022          * This can be overridden at mount ("handletimeout=") if the user wants
2023          * a different persistent (or resilient) handle timeout for all opens
2024          * opens on a particular SMB3 mount.
2025          */
2026         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2027         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2028         generate_random_uuid(buf->dcontext.CreateGuid);
2029         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2030
2031         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2032         buf->Name[0] = 'D';
2033         buf->Name[1] = 'H';
2034         buf->Name[2] = '2';
2035         buf->Name[3] = 'Q';
2036         return buf;
2037 }
2038
2039 static struct create_durable_handle_reconnect_v2 *
2040 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2041 {
2042         struct create_durable_handle_reconnect_v2 *buf;
2043
2044         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2045                         GFP_KERNEL);
2046         if (!buf)
2047                 return NULL;
2048
2049         buf->ccontext.DataOffset =
2050                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2051                                      dcontext));
2052         buf->ccontext.DataLength =
2053                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2054         buf->ccontext.NameOffset =
2055                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2056                             Name));
2057         buf->ccontext.NameLength = cpu_to_le16(4);
2058
2059         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2060         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2061         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2062         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2063
2064         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2065         buf->Name[0] = 'D';
2066         buf->Name[1] = 'H';
2067         buf->Name[2] = '2';
2068         buf->Name[3] = 'C';
2069         return buf;
2070 }
2071
2072 static int
2073 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2074                     struct cifs_open_parms *oparms)
2075 {
2076         struct smb2_create_req *req = iov[0].iov_base;
2077         unsigned int num = *num_iovec;
2078
2079         iov[num].iov_base = create_durable_v2_buf(oparms);
2080         if (iov[num].iov_base == NULL)
2081                 return -ENOMEM;
2082         iov[num].iov_len = sizeof(struct create_durable_v2);
2083         if (!req->CreateContextsOffset)
2084                 req->CreateContextsOffset =
2085                         cpu_to_le32(sizeof(struct smb2_create_req) +
2086                                                                 iov[1].iov_len);
2087         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2088         *num_iovec = num + 1;
2089         return 0;
2090 }
2091
2092 static int
2093 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2094                     struct cifs_open_parms *oparms)
2095 {
2096         struct smb2_create_req *req = iov[0].iov_base;
2097         unsigned int num = *num_iovec;
2098
2099         /* indicate that we don't need to relock the file */
2100         oparms->reconnect = false;
2101
2102         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2103         if (iov[num].iov_base == NULL)
2104                 return -ENOMEM;
2105         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2106         if (!req->CreateContextsOffset)
2107                 req->CreateContextsOffset =
2108                         cpu_to_le32(sizeof(struct smb2_create_req) +
2109                                                                 iov[1].iov_len);
2110         le32_add_cpu(&req->CreateContextsLength,
2111                         sizeof(struct create_durable_handle_reconnect_v2));
2112         *num_iovec = num + 1;
2113         return 0;
2114 }
2115
2116 static int
2117 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2118                     struct cifs_open_parms *oparms, bool use_persistent)
2119 {
2120         struct smb2_create_req *req = iov[0].iov_base;
2121         unsigned int num = *num_iovec;
2122
2123         if (use_persistent) {
2124                 if (oparms->reconnect)
2125                         return add_durable_reconnect_v2_context(iov, num_iovec,
2126                                                                 oparms);
2127                 else
2128                         return add_durable_v2_context(iov, num_iovec, oparms);
2129         }
2130
2131         if (oparms->reconnect) {
2132                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2133                 /* indicate that we don't need to relock the file */
2134                 oparms->reconnect = false;
2135         } else
2136                 iov[num].iov_base = create_durable_buf();
2137         if (iov[num].iov_base == NULL)
2138                 return -ENOMEM;
2139         iov[num].iov_len = sizeof(struct create_durable);
2140         if (!req->CreateContextsOffset)
2141                 req->CreateContextsOffset =
2142                         cpu_to_le32(sizeof(struct smb2_create_req) +
2143                                                                 iov[1].iov_len);
2144         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2145         *num_iovec = num + 1;
2146         return 0;
2147 }
2148
2149 /* See MS-SMB2 2.2.13.2.7 */
2150 static struct crt_twarp_ctxt *
2151 create_twarp_buf(__u64 timewarp)
2152 {
2153         struct crt_twarp_ctxt *buf;
2154
2155         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2156         if (!buf)
2157                 return NULL;
2158
2159         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2160                                         (struct crt_twarp_ctxt, Timestamp));
2161         buf->ccontext.DataLength = cpu_to_le32(8);
2162         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2163                                 (struct crt_twarp_ctxt, Name));
2164         buf->ccontext.NameLength = cpu_to_le16(4);
2165         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2166         buf->Name[0] = 'T';
2167         buf->Name[1] = 'W';
2168         buf->Name[2] = 'r';
2169         buf->Name[3] = 'p';
2170         buf->Timestamp = cpu_to_le64(timewarp);
2171         return buf;
2172 }
2173
2174 /* See MS-SMB2 2.2.13.2.7 */
2175 static int
2176 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2177 {
2178         struct smb2_create_req *req = iov[0].iov_base;
2179         unsigned int num = *num_iovec;
2180
2181         iov[num].iov_base = create_twarp_buf(timewarp);
2182         if (iov[num].iov_base == NULL)
2183                 return -ENOMEM;
2184         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2185         if (!req->CreateContextsOffset)
2186                 req->CreateContextsOffset = cpu_to_le32(
2187                                 sizeof(struct smb2_create_req) +
2188                                 iov[num - 1].iov_len);
2189         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2190         *num_iovec = num + 1;
2191         return 0;
2192 }
2193
2194 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2195 static struct crt_sd_ctxt *
2196 create_sd_buf(umode_t mode, unsigned int *len)
2197 {
2198         struct crt_sd_ctxt *buf;
2199         struct cifs_ace *pace;
2200         unsigned int sdlen, acelen;
2201
2202         *len = roundup(sizeof(struct crt_sd_ctxt) + sizeof(struct cifs_ace) * 2,
2203                         8);
2204         buf = kzalloc(*len, GFP_KERNEL);
2205         if (buf == NULL)
2206                 return buf;
2207
2208         sdlen = sizeof(struct smb3_sd) + sizeof(struct smb3_acl) +
2209                  2 * sizeof(struct cifs_ace);
2210
2211         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2212                                         (struct crt_sd_ctxt, sd));
2213         buf->ccontext.DataLength = cpu_to_le32(sdlen);
2214         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2215                                 (struct crt_sd_ctxt, Name));
2216         buf->ccontext.NameLength = cpu_to_le16(4);
2217         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2218         buf->Name[0] = 'S';
2219         buf->Name[1] = 'e';
2220         buf->Name[2] = 'c';
2221         buf->Name[3] = 'D';
2222         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2223         /*
2224          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2225          * and "DP" ie the DACL is present
2226          */
2227         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2228
2229         /* offset owner, group and Sbz1 and SACL are all zero */
2230         buf->sd.OffsetDacl = cpu_to_le32(sizeof(struct smb3_sd));
2231         buf->acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2232
2233         /* create one ACE to hold the mode embedded in reserved special SID */
2234         pace = (struct cifs_ace *)(sizeof(struct crt_sd_ctxt) + (char *)buf);
2235         acelen = setup_special_mode_ACE(pace, (__u64)mode);
2236         /* and one more ACE to allow access for authenticated users */
2237         pace = (struct cifs_ace *)(acelen + (sizeof(struct crt_sd_ctxt) +
2238                 (char *)buf));
2239         acelen += setup_authusers_ACE(pace);
2240         buf->acl.AclSize = cpu_to_le16(sizeof(struct cifs_acl) + acelen);
2241         buf->acl.AceCount = cpu_to_le16(2);
2242         return buf;
2243 }
2244
2245 static int
2246 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
2247 {
2248         struct smb2_create_req *req = iov[0].iov_base;
2249         unsigned int num = *num_iovec;
2250         unsigned int len = 0;
2251
2252         iov[num].iov_base = create_sd_buf(mode, &len);
2253         if (iov[num].iov_base == NULL)
2254                 return -ENOMEM;
2255         iov[num].iov_len = len;
2256         if (!req->CreateContextsOffset)
2257                 req->CreateContextsOffset = cpu_to_le32(
2258                                 sizeof(struct smb2_create_req) +
2259                                 iov[num - 1].iov_len);
2260         le32_add_cpu(&req->CreateContextsLength, len);
2261         *num_iovec = num + 1;
2262         return 0;
2263 }
2264
2265 static struct crt_query_id_ctxt *
2266 create_query_id_buf(void)
2267 {
2268         struct crt_query_id_ctxt *buf;
2269
2270         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2271         if (!buf)
2272                 return NULL;
2273
2274         buf->ccontext.DataOffset = cpu_to_le16(0);
2275         buf->ccontext.DataLength = cpu_to_le32(0);
2276         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2277                                 (struct crt_query_id_ctxt, Name));
2278         buf->ccontext.NameLength = cpu_to_le16(4);
2279         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2280         buf->Name[0] = 'Q';
2281         buf->Name[1] = 'F';
2282         buf->Name[2] = 'i';
2283         buf->Name[3] = 'd';
2284         return buf;
2285 }
2286
2287 /* See MS-SMB2 2.2.13.2.9 */
2288 static int
2289 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2290 {
2291         struct smb2_create_req *req = iov[0].iov_base;
2292         unsigned int num = *num_iovec;
2293
2294         iov[num].iov_base = create_query_id_buf();
2295         if (iov[num].iov_base == NULL)
2296                 return -ENOMEM;
2297         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2298         if (!req->CreateContextsOffset)
2299                 req->CreateContextsOffset = cpu_to_le32(
2300                                 sizeof(struct smb2_create_req) +
2301                                 iov[num - 1].iov_len);
2302         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2303         *num_iovec = num + 1;
2304         return 0;
2305 }
2306
2307 static int
2308 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2309                             const char *treename, const __le16 *path)
2310 {
2311         int treename_len, path_len;
2312         struct nls_table *cp;
2313         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2314
2315         /*
2316          * skip leading "\\"
2317          */
2318         treename_len = strlen(treename);
2319         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2320                 return -EINVAL;
2321
2322         treename += 2;
2323         treename_len -= 2;
2324
2325         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2326
2327         /*
2328          * make room for one path separator between the treename and
2329          * path
2330          */
2331         *out_len = treename_len + 1 + path_len;
2332
2333         /*
2334          * final path needs to be null-terminated UTF16 with a
2335          * size aligned to 8
2336          */
2337
2338         *out_size = roundup((*out_len+1)*2, 8);
2339         *out_path = kzalloc(*out_size, GFP_KERNEL);
2340         if (!*out_path)
2341                 return -ENOMEM;
2342
2343         cp = load_nls_default();
2344         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2345         UniStrcat(*out_path, sep);
2346         UniStrcat(*out_path, path);
2347         unload_nls(cp);
2348
2349         return 0;
2350 }
2351
2352 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2353                                umode_t mode, struct cifs_tcon *tcon,
2354                                const char *full_path,
2355                                struct cifs_sb_info *cifs_sb)
2356 {
2357         struct smb_rqst rqst;
2358         struct smb2_create_req *req;
2359         struct smb2_create_rsp *rsp = NULL;
2360         struct cifs_ses *ses = tcon->ses;
2361         struct kvec iov[3]; /* make sure at least one for each open context */
2362         struct kvec rsp_iov = {NULL, 0};
2363         int resp_buftype;
2364         int uni_path_len;
2365         __le16 *copy_path = NULL;
2366         int copy_size;
2367         int rc = 0;
2368         unsigned int n_iov = 2;
2369         __u32 file_attributes = 0;
2370         char *pc_buf = NULL;
2371         int flags = 0;
2372         unsigned int total_len;
2373         __le16 *utf16_path = NULL;
2374
2375         cifs_dbg(FYI, "mkdir\n");
2376
2377         /* resource #1: path allocation */
2378         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2379         if (!utf16_path)
2380                 return -ENOMEM;
2381
2382         if (!ses || !(ses->server)) {
2383                 rc = -EIO;
2384                 goto err_free_path;
2385         }
2386
2387         /* resource #2: request */
2388         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2389         if (rc)
2390                 goto err_free_path;
2391
2392
2393         if (smb3_encryption_required(tcon))
2394                 flags |= CIFS_TRANSFORM_REQ;
2395
2396         req->ImpersonationLevel = IL_IMPERSONATION;
2397         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2398         /* File attributes ignored on open (used in create though) */
2399         req->FileAttributes = cpu_to_le32(file_attributes);
2400         req->ShareAccess = FILE_SHARE_ALL_LE;
2401         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2402         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2403
2404         iov[0].iov_base = (char *)req;
2405         /* -1 since last byte is buf[0] which is sent below (path) */
2406         iov[0].iov_len = total_len - 1;
2407
2408         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2409
2410         /* [MS-SMB2] 2.2.13 NameOffset:
2411          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2412          * the SMB2 header, the file name includes a prefix that will
2413          * be processed during DFS name normalization as specified in
2414          * section 3.3.5.9. Otherwise, the file name is relative to
2415          * the share that is identified by the TreeId in the SMB2
2416          * header.
2417          */
2418         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2419                 int name_len;
2420
2421                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2422                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2423                                                  &name_len,
2424                                                  tcon->treeName, utf16_path);
2425                 if (rc)
2426                         goto err_free_req;
2427
2428                 req->NameLength = cpu_to_le16(name_len * 2);
2429                 uni_path_len = copy_size;
2430                 /* free before overwriting resource */
2431                 kfree(utf16_path);
2432                 utf16_path = copy_path;
2433         } else {
2434                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2435                 /* MUST set path len (NameLength) to 0 opening root of share */
2436                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2437                 if (uni_path_len % 8 != 0) {
2438                         copy_size = roundup(uni_path_len, 8);
2439                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2440                         if (!copy_path) {
2441                                 rc = -ENOMEM;
2442                                 goto err_free_req;
2443                         }
2444                         memcpy((char *)copy_path, (const char *)utf16_path,
2445                                uni_path_len);
2446                         uni_path_len = copy_size;
2447                         /* free before overwriting resource */
2448                         kfree(utf16_path);
2449                         utf16_path = copy_path;
2450                 }
2451         }
2452
2453         iov[1].iov_len = uni_path_len;
2454         iov[1].iov_base = utf16_path;
2455         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2456
2457         if (tcon->posix_extensions) {
2458                 /* resource #3: posix buf */
2459                 rc = add_posix_context(iov, &n_iov, mode);
2460                 if (rc)
2461                         goto err_free_req;
2462                 pc_buf = iov[n_iov-1].iov_base;
2463         }
2464
2465
2466         memset(&rqst, 0, sizeof(struct smb_rqst));
2467         rqst.rq_iov = iov;
2468         rqst.rq_nvec = n_iov;
2469
2470         /* no need to inc num_remote_opens because we close it just below */
2471         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2472                                     FILE_WRITE_ATTRIBUTES);
2473         /* resource #4: response buffer */
2474         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2475         if (rc) {
2476                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2477                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2478                                            CREATE_NOT_FILE,
2479                                            FILE_WRITE_ATTRIBUTES, rc);
2480                 goto err_free_rsp_buf;
2481         }
2482
2483         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2484         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2485                                     ses->Suid, CREATE_NOT_FILE,
2486                                     FILE_WRITE_ATTRIBUTES);
2487
2488         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2489
2490         /* Eventually save off posix specific response info and timestaps */
2491
2492 err_free_rsp_buf:
2493         free_rsp_buf(resp_buftype, rsp);
2494         kfree(pc_buf);
2495 err_free_req:
2496         cifs_small_buf_release(req);
2497 err_free_path:
2498         kfree(utf16_path);
2499         return rc;
2500 }
2501
2502 int
2503 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2504                struct cifs_open_parms *oparms, __le16 *path)
2505 {
2506         struct TCP_Server_Info *server = tcon->ses->server;
2507         struct smb2_create_req *req;
2508         unsigned int n_iov = 2;
2509         __u32 file_attributes = 0;
2510         int copy_size;
2511         int uni_path_len;
2512         unsigned int total_len;
2513         struct kvec *iov = rqst->rq_iov;
2514         __le16 *copy_path;
2515         int rc;
2516
2517         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2518         if (rc)
2519                 return rc;
2520
2521         iov[0].iov_base = (char *)req;
2522         /* -1 since last byte is buf[0] which is sent below (path) */
2523         iov[0].iov_len = total_len - 1;
2524
2525         if (oparms->create_options & CREATE_OPTION_READONLY)
2526                 file_attributes |= ATTR_READONLY;
2527         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2528                 file_attributes |= ATTR_SYSTEM;
2529
2530         req->ImpersonationLevel = IL_IMPERSONATION;
2531         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2532         /* File attributes ignored on open (used in create though) */
2533         req->FileAttributes = cpu_to_le32(file_attributes);
2534         req->ShareAccess = FILE_SHARE_ALL_LE;
2535
2536         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2537         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2538         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2539
2540         /* [MS-SMB2] 2.2.13 NameOffset:
2541          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2542          * the SMB2 header, the file name includes a prefix that will
2543          * be processed during DFS name normalization as specified in
2544          * section 3.3.5.9. Otherwise, the file name is relative to
2545          * the share that is identified by the TreeId in the SMB2
2546          * header.
2547          */
2548         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2549                 int name_len;
2550
2551                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2552                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2553                                                  &name_len,
2554                                                  tcon->treeName, path);
2555                 if (rc)
2556                         return rc;
2557                 req->NameLength = cpu_to_le16(name_len * 2);
2558                 uni_path_len = copy_size;
2559                 path = copy_path;
2560         } else {
2561                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2562                 /* MUST set path len (NameLength) to 0 opening root of share */
2563                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2564                 copy_size = uni_path_len;
2565                 if (copy_size % 8 != 0)
2566                         copy_size = roundup(copy_size, 8);
2567                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2568                 if (!copy_path)
2569                         return -ENOMEM;
2570                 memcpy((char *)copy_path, (const char *)path,
2571                        uni_path_len);
2572                 uni_path_len = copy_size;
2573                 path = copy_path;
2574         }
2575
2576         iov[1].iov_len = uni_path_len;
2577         iov[1].iov_base = path;
2578
2579         if ((!server->oplocks) || (tcon->no_lease))
2580                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2581
2582         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2583             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2584                 req->RequestedOplockLevel = *oplock;
2585         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2586                   (oparms->create_options & CREATE_NOT_FILE))
2587                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2588         else {
2589                 rc = add_lease_context(server, iov, &n_iov,
2590                                        oparms->fid->lease_key, oplock);
2591                 if (rc)
2592                         return rc;
2593         }
2594
2595         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2596                 /* need to set Next field of lease context if we request it */
2597                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2598                         struct create_context *ccontext =
2599                             (struct create_context *)iov[n_iov-1].iov_base;
2600                         ccontext->Next =
2601                                 cpu_to_le32(server->vals->create_lease_size);
2602                 }
2603
2604                 rc = add_durable_context(iov, &n_iov, oparms,
2605                                         tcon->use_persistent);
2606                 if (rc)
2607                         return rc;
2608         }
2609
2610         if (tcon->posix_extensions) {
2611                 if (n_iov > 2) {
2612                         struct create_context *ccontext =
2613                             (struct create_context *)iov[n_iov-1].iov_base;
2614                         ccontext->Next =
2615                                 cpu_to_le32(iov[n_iov-1].iov_len);
2616                 }
2617
2618                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2619                 if (rc)
2620                         return rc;
2621         }
2622
2623         if (tcon->snapshot_time) {
2624                 cifs_dbg(FYI, "adding snapshot context\n");
2625                 if (n_iov > 2) {
2626                         struct create_context *ccontext =
2627                             (struct create_context *)iov[n_iov-1].iov_base;
2628                         ccontext->Next =
2629                                 cpu_to_le32(iov[n_iov-1].iov_len);
2630                 }
2631
2632                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2633                 if (rc)
2634                         return rc;
2635         }
2636
2637         if ((oparms->disposition != FILE_OPEN) &&
2638             (oparms->cifs_sb) &&
2639             (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2640             (oparms->mode != ACL_NO_MODE)) {
2641                 if (n_iov > 2) {
2642                         struct create_context *ccontext =
2643                             (struct create_context *)iov[n_iov-1].iov_base;
2644                         ccontext->Next =
2645                                 cpu_to_le32(iov[n_iov-1].iov_len);
2646                 }
2647
2648                 cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2649                 rc = add_sd_context(iov, &n_iov, oparms->mode);
2650                 if (rc)
2651                         return rc;
2652         }
2653
2654         if (n_iov > 2) {
2655                 struct create_context *ccontext =
2656                         (struct create_context *)iov[n_iov-1].iov_base;
2657                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2658         }
2659         add_query_id_context(iov, &n_iov);
2660
2661         rqst->rq_nvec = n_iov;
2662         return 0;
2663 }
2664
2665 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2666  * All other vectors are freed by kfree().
2667  */
2668 void
2669 SMB2_open_free(struct smb_rqst *rqst)
2670 {
2671         int i;
2672
2673         if (rqst && rqst->rq_iov) {
2674                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2675                 for (i = 1; i < rqst->rq_nvec; i++)
2676                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2677                                 kfree(rqst->rq_iov[i].iov_base);
2678         }
2679 }
2680
2681 int
2682 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2683           __u8 *oplock, struct smb2_file_all_info *buf,
2684           struct kvec *err_iov, int *buftype)
2685 {
2686         struct smb_rqst rqst;
2687         struct smb2_create_rsp *rsp = NULL;
2688         struct TCP_Server_Info *server;
2689         struct cifs_tcon *tcon = oparms->tcon;
2690         struct cifs_ses *ses = tcon->ses;
2691         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2692         struct kvec rsp_iov = {NULL, 0};
2693         int resp_buftype = CIFS_NO_BUFFER;
2694         int rc = 0;
2695         int flags = 0;
2696
2697         cifs_dbg(FYI, "create/open\n");
2698         if (ses && (ses->server))
2699                 server = ses->server;
2700         else
2701                 return -EIO;
2702
2703         if (smb3_encryption_required(tcon))
2704                 flags |= CIFS_TRANSFORM_REQ;
2705
2706         memset(&rqst, 0, sizeof(struct smb_rqst));
2707         memset(&iov, 0, sizeof(iov));
2708         rqst.rq_iov = iov;
2709         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2710
2711         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2712         if (rc)
2713                 goto creat_exit;
2714
2715         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2716                 oparms->create_options, oparms->desired_access);
2717
2718         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2719                             &rsp_iov);
2720         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2721
2722         if (rc != 0) {
2723                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2724                 if (err_iov && rsp) {
2725                         *err_iov = rsp_iov;
2726                         *buftype = resp_buftype;
2727                         resp_buftype = CIFS_NO_BUFFER;
2728                         rsp = NULL;
2729                 }
2730                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2731                                     oparms->create_options, oparms->desired_access, rc);
2732                 if (rc == -EREMCHG) {
2733                         printk_once(KERN_WARNING "server share %s deleted\n",
2734                                     tcon->treeName);
2735                         tcon->need_reconnect = true;
2736                 }
2737                 goto creat_exit;
2738         } else
2739                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2740                                      ses->Suid, oparms->create_options,
2741                                      oparms->desired_access);
2742
2743         atomic_inc(&tcon->num_remote_opens);
2744         oparms->fid->persistent_fid = rsp->PersistentFileId;
2745         oparms->fid->volatile_fid = rsp->VolatileFileId;
2746 #ifdef CONFIG_CIFS_DEBUG2
2747         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2748 #endif /* CIFS_DEBUG2 */
2749
2750         if (buf) {
2751                 memcpy(buf, &rsp->CreationTime, 32);
2752                 buf->AllocationSize = rsp->AllocationSize;
2753                 buf->EndOfFile = rsp->EndofFile;
2754                 buf->Attributes = rsp->FileAttributes;
2755                 buf->NumberOfLinks = cpu_to_le32(1);
2756                 buf->DeletePending = 0;
2757         }
2758
2759
2760         smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
2761                             oparms->fid->lease_key, oplock, buf);
2762 creat_exit:
2763         SMB2_open_free(&rqst);
2764         free_rsp_buf(resp_buftype, rsp);
2765         return rc;
2766 }
2767
2768 int
2769 SMB2_ioctl_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2770                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2771                 bool is_fsctl, char *in_data, u32 indatalen,
2772                 __u32 max_response_size)
2773 {
2774         struct smb2_ioctl_req *req;
2775         struct kvec *iov = rqst->rq_iov;
2776         unsigned int total_len;
2777         int rc;
2778         char *in_data_buf;
2779
2780         rc = smb2_ioctl_req_init(opcode, tcon, (void **) &req, &total_len);
2781         if (rc)
2782                 return rc;
2783
2784         if (indatalen) {
2785                 /*
2786                  * indatalen is usually small at a couple of bytes max, so
2787                  * just allocate through generic pool
2788                  */
2789                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
2790                 if (!in_data_buf) {
2791                         cifs_small_buf_release(req);
2792                         return -ENOMEM;
2793                 }
2794         }
2795
2796         req->CtlCode = cpu_to_le32(opcode);
2797         req->PersistentFileId = persistent_fid;
2798         req->VolatileFileId = volatile_fid;
2799
2800         iov[0].iov_base = (char *)req;
2801         /*
2802          * If no input data, the size of ioctl struct in
2803          * protocol spec still includes a 1 byte data buffer,
2804          * but if input data passed to ioctl, we do not
2805          * want to double count this, so we do not send
2806          * the dummy one byte of data in iovec[0] if sending
2807          * input data (in iovec[1]).
2808          */
2809         if (indatalen) {
2810                 req->InputCount = cpu_to_le32(indatalen);
2811                 /* do not set InputOffset if no input data */
2812                 req->InputOffset =
2813                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2814                 rqst->rq_nvec = 2;
2815                 iov[0].iov_len = total_len - 1;
2816                 iov[1].iov_base = in_data_buf;
2817                 iov[1].iov_len = indatalen;
2818         } else {
2819                 rqst->rq_nvec = 1;
2820                 iov[0].iov_len = total_len;
2821         }
2822
2823         req->OutputOffset = 0;
2824         req->OutputCount = 0; /* MBZ */
2825
2826         /*
2827          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
2828          * We Could increase default MaxOutputResponse, but that could require
2829          * more credits. Windows typically sets this smaller, but for some
2830          * ioctls it may be useful to allow server to send more. No point
2831          * limiting what the server can send as long as fits in one credit
2832          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
2833          * to increase this limit up in the future.
2834          * Note that for snapshot queries that servers like Azure expect that
2835          * the first query be minimal size (and just used to get the number/size
2836          * of previous versions) so response size must be specified as EXACTLY
2837          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2838          * of eight bytes.  Currently that is the only case where we set max
2839          * response size smaller.
2840          */
2841         req->MaxOutputResponse = cpu_to_le32(max_response_size);
2842
2843         if (is_fsctl)
2844                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2845         else
2846                 req->Flags = 0;
2847
2848         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2849         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2850                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2851
2852         return 0;
2853 }
2854
2855 void
2856 SMB2_ioctl_free(struct smb_rqst *rqst)
2857 {
2858         int i;
2859         if (rqst && rqst->rq_iov) {
2860                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2861                 for (i = 1; i < rqst->rq_nvec; i++)
2862                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2863                                 kfree(rqst->rq_iov[i].iov_base);
2864         }
2865 }
2866
2867
2868 /*
2869  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2870  */
2871 int
2872 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2873            u64 volatile_fid, u32 opcode, bool is_fsctl,
2874            char *in_data, u32 indatalen, u32 max_out_data_len,
2875            char **out_data, u32 *plen /* returned data len */)
2876 {
2877         struct smb_rqst rqst;
2878         struct smb2_ioctl_rsp *rsp = NULL;
2879         struct cifs_ses *ses;
2880         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
2881         struct kvec rsp_iov = {NULL, 0};
2882         int resp_buftype = CIFS_NO_BUFFER;
2883         int rc = 0;
2884         int flags = 0;
2885         struct TCP_Server_Info *server;
2886
2887         cifs_dbg(FYI, "SMB2 IOCTL\n");
2888
2889         if (out_data != NULL)
2890                 *out_data = NULL;
2891
2892         /* zero out returned data len, in case of error */
2893         if (plen)
2894                 *plen = 0;
2895
2896         if (tcon)
2897                 ses = tcon->ses;
2898         else
2899                 return -EIO;
2900
2901         if (!ses)
2902                 return -EIO;
2903         server = ses->server;
2904         if (!server)
2905                 return -EIO;
2906
2907         if (smb3_encryption_required(tcon))
2908                 flags |= CIFS_TRANSFORM_REQ;
2909
2910         memset(&rqst, 0, sizeof(struct smb_rqst));
2911         memset(&iov, 0, sizeof(iov));
2912         rqst.rq_iov = iov;
2913         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
2914
2915         rc = SMB2_ioctl_init(tcon, &rqst, persistent_fid, volatile_fid, opcode,
2916                              is_fsctl, in_data, indatalen, max_out_data_len);
2917         if (rc)
2918                 goto ioctl_exit;
2919
2920         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2921                             &rsp_iov);
2922         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2923
2924         if (rc != 0)
2925                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2926                                 ses->Suid, 0, opcode, rc);
2927
2928         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
2929                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2930                 goto ioctl_exit;
2931         } else if (rc == -EINVAL) {
2932                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2933                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2934                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2935                         goto ioctl_exit;
2936                 }
2937         } else if (rc == -E2BIG) {
2938                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
2939                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2940                         goto ioctl_exit;
2941                 }
2942         }
2943
2944         /* check if caller wants to look at return data or just return rc */
2945         if ((plen == NULL) || (out_data == NULL))
2946                 goto ioctl_exit;
2947
2948         *plen = le32_to_cpu(rsp->OutputCount);
2949
2950         /* We check for obvious errors in the output buffer length and offset */
2951         if (*plen == 0)
2952                 goto ioctl_exit; /* server returned no data */
2953         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
2954                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2955                 *plen = 0;
2956                 rc = -EIO;
2957                 goto ioctl_exit;
2958         }
2959
2960         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
2961                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2962                         le32_to_cpu(rsp->OutputOffset));
2963                 *plen = 0;
2964                 rc = -EIO;
2965                 goto ioctl_exit;
2966         }
2967
2968         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
2969                             *plen, GFP_KERNEL);
2970         if (*out_data == NULL) {
2971                 rc = -ENOMEM;
2972                 goto ioctl_exit;
2973         }
2974
2975 ioctl_exit:
2976         SMB2_ioctl_free(&rqst);
2977         free_rsp_buf(resp_buftype, rsp);
2978         return rc;
2979 }
2980
2981 /*
2982  *   Individual callers to ioctl worker function follow
2983  */
2984
2985 int
2986 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2987                      u64 persistent_fid, u64 volatile_fid)
2988 {
2989         int rc;
2990         struct  compress_ioctl fsctl_input;
2991         char *ret_data = NULL;
2992
2993         fsctl_input.CompressionState =
2994                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2995
2996         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2997                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2998                         (char *)&fsctl_input /* data input */,
2999                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3000                         &ret_data /* out data */, NULL);
3001
3002         cifs_dbg(FYI, "set compression rc %d\n", rc);
3003
3004         return rc;
3005 }
3006
3007 int
3008 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
3009                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3010 {
3011         struct smb2_close_req *req;
3012         struct kvec *iov = rqst->rq_iov;
3013         unsigned int total_len;
3014         int rc;
3015
3016         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
3017         if (rc)
3018                 return rc;
3019
3020         req->PersistentFileId = persistent_fid;
3021         req->VolatileFileId = volatile_fid;
3022         if (query_attrs)
3023                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3024         else
3025                 req->Flags = 0;
3026         iov[0].iov_base = (char *)req;
3027         iov[0].iov_len = total_len;
3028
3029         return 0;
3030 }
3031
3032 void
3033 SMB2_close_free(struct smb_rqst *rqst)
3034 {
3035         if (rqst && rqst->rq_iov)
3036                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3037 }
3038
3039 int
3040 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3041              u64 persistent_fid, u64 volatile_fid,
3042              struct smb2_file_network_open_info *pbuf)
3043 {
3044         struct smb_rqst rqst;
3045         struct smb2_close_rsp *rsp = NULL;
3046         struct cifs_ses *ses = tcon->ses;
3047         struct kvec iov[1];
3048         struct kvec rsp_iov;
3049         int resp_buftype = CIFS_NO_BUFFER;
3050         int rc = 0;
3051         int flags = 0;
3052         bool query_attrs = false;
3053
3054         cifs_dbg(FYI, "Close\n");
3055
3056         if (!ses || !(ses->server))
3057                 return -EIO;
3058
3059         if (smb3_encryption_required(tcon))
3060                 flags |= CIFS_TRANSFORM_REQ;
3061
3062         memset(&rqst, 0, sizeof(struct smb_rqst));
3063         memset(&iov, 0, sizeof(iov));
3064         rqst.rq_iov = iov;
3065         rqst.rq_nvec = 1;
3066
3067         /* check if need to ask server to return timestamps in close response */
3068         if (pbuf)
3069                 query_attrs = true;
3070
3071         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3072         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid,
3073                              query_attrs);
3074         if (rc)
3075                 goto close_exit;
3076
3077         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3078         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3079
3080         if (rc != 0) {
3081                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3082                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3083                                      rc);
3084                 goto close_exit;
3085         } else {
3086                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3087                                       ses->Suid);
3088                 /*
3089                  * Note that have to subtract 4 since struct network_open_info
3090                  * has a final 4 byte pad that close response does not have
3091                  */
3092                 if (pbuf)
3093                         memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3094         }
3095
3096         atomic_dec(&tcon->num_remote_opens);
3097 close_exit:
3098         SMB2_close_free(&rqst);
3099         free_rsp_buf(resp_buftype, rsp);
3100
3101         /* retry close in a worker thread if this one is interrupted */
3102         if (rc == -EINTR) {
3103                 int tmp_rc;
3104
3105                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3106                                                      volatile_fid);
3107                 if (tmp_rc)
3108                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3109                                  persistent_fid, tmp_rc);
3110         }
3111         return rc;
3112 }
3113
3114 int
3115 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3116                 u64 persistent_fid, u64 volatile_fid)
3117 {
3118         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3119 }
3120
3121 int
3122 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3123                   struct kvec *iov, unsigned int min_buf_size)
3124 {
3125         unsigned int smb_len = iov->iov_len;
3126         char *end_of_smb = smb_len + (char *)iov->iov_base;
3127         char *begin_of_buf = offset + (char *)iov->iov_base;
3128         char *end_of_buf = begin_of_buf + buffer_length;
3129
3130
3131         if (buffer_length < min_buf_size) {
3132                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3133                          buffer_length, min_buf_size);
3134                 return -EINVAL;
3135         }
3136
3137         /* check if beyond RFC1001 maximum length */
3138         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3139                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3140                          buffer_length, smb_len);
3141                 return -EINVAL;
3142         }
3143
3144         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3145                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
3146                 return -EINVAL;
3147         }
3148
3149         return 0;
3150 }
3151
3152 /*
3153  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3154  * Caller must free buffer.
3155  */
3156 int
3157 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3158                            struct kvec *iov, unsigned int minbufsize,
3159                            char *data)
3160 {
3161         char *begin_of_buf = offset + (char *)iov->iov_base;
3162         int rc;
3163
3164         if (!data)
3165                 return -EINVAL;
3166
3167         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3168         if (rc)
3169                 return rc;
3170
3171         memcpy(data, begin_of_buf, buffer_length);
3172
3173         return 0;
3174 }
3175
3176 int
3177 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
3178                      u64 persistent_fid, u64 volatile_fid,
3179                      u8 info_class, u8 info_type, u32 additional_info,
3180                      size_t output_len, size_t input_len, void *input)
3181 {
3182         struct smb2_query_info_req *req;
3183         struct kvec *iov = rqst->rq_iov;
3184         unsigned int total_len;
3185         int rc;
3186
3187         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
3188                              &total_len);
3189         if (rc)
3190                 return rc;
3191
3192         req->InfoType = info_type;
3193         req->FileInfoClass = info_class;
3194         req->PersistentFileId = persistent_fid;
3195         req->VolatileFileId = volatile_fid;
3196         req->AdditionalInformation = cpu_to_le32(additional_info);
3197
3198         req->OutputBufferLength = cpu_to_le32(output_len);
3199         if (input_len) {
3200                 req->InputBufferLength = cpu_to_le32(input_len);
3201                 /* total_len for smb query request never close to le16 max */
3202                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3203                 memcpy(req->Buffer, input, input_len);
3204         }
3205
3206         iov[0].iov_base = (char *)req;
3207         /* 1 for Buffer */
3208         iov[0].iov_len = total_len - 1 + input_len;
3209         return 0;
3210 }
3211
3212 void
3213 SMB2_query_info_free(struct smb_rqst *rqst)
3214 {
3215         if (rqst && rqst->rq_iov)
3216                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3217 }
3218
3219 static int
3220 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3221            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3222            u32 additional_info, size_t output_len, size_t min_len, void **data,
3223                 u32 *dlen)
3224 {
3225         struct smb_rqst rqst;
3226         struct smb2_query_info_rsp *rsp = NULL;
3227         struct kvec iov[1];
3228         struct kvec rsp_iov;
3229         int rc = 0;
3230         int resp_buftype = CIFS_NO_BUFFER;
3231         struct cifs_ses *ses = tcon->ses;
3232         struct TCP_Server_Info *server;
3233         int flags = 0;
3234         bool allocated = false;
3235
3236         cifs_dbg(FYI, "Query Info\n");
3237
3238         if (!ses)
3239                 return -EIO;
3240         server = ses->server;
3241         if (!server)
3242                 return -EIO;
3243
3244         if (smb3_encryption_required(tcon))
3245                 flags |= CIFS_TRANSFORM_REQ;
3246
3247         memset(&rqst, 0, sizeof(struct smb_rqst));
3248         memset(&iov, 0, sizeof(iov));
3249         rqst.rq_iov = iov;
3250         rqst.rq_nvec = 1;
3251
3252         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
3253                                   info_class, info_type, additional_info,
3254                                   output_len, 0, NULL);
3255         if (rc)
3256                 goto qinf_exit;
3257
3258         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3259                                     ses->Suid, info_class, (__u32)info_type);
3260
3261         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3262         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3263
3264         if (rc) {
3265                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3266                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3267                                 ses->Suid, info_class, (__u32)info_type, rc);
3268                 goto qinf_exit;
3269         }
3270
3271         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3272                                 ses->Suid, info_class, (__u32)info_type);
3273
3274         if (dlen) {
3275                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3276                 if (!*data) {
3277                         *data = kmalloc(*dlen, GFP_KERNEL);
3278                         if (!*data) {
3279                                 cifs_tcon_dbg(VFS,
3280                                         "Error %d allocating memory for acl\n",
3281                                         rc);
3282                                 *dlen = 0;
3283                                 rc = -ENOMEM;
3284                                 goto qinf_exit;
3285                         }
3286                         allocated = true;
3287                 }
3288         }
3289
3290         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3291                                         le32_to_cpu(rsp->OutputBufferLength),
3292                                         &rsp_iov, min_len, *data);
3293         if (rc && allocated) {
3294                 kfree(*data);
3295                 *data = NULL;
3296                 *dlen = 0;
3297         }
3298
3299 qinf_exit:
3300         SMB2_query_info_free(&rqst);
3301         free_rsp_buf(resp_buftype, rsp);
3302         return rc;
3303 }
3304
3305 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3306         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3307 {
3308         return query_info(xid, tcon, persistent_fid, volatile_fid,
3309                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3310                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3311                           sizeof(struct smb2_file_all_info), (void **)&data,
3312                           NULL);
3313 }
3314
3315 int
3316 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3317                 u64 persistent_fid, u64 volatile_fid,
3318                 void **data, u32 *plen)
3319 {
3320         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
3321         *plen = 0;
3322
3323         return query_info(xid, tcon, persistent_fid, volatile_fid,
3324                           0, SMB2_O_INFO_SECURITY, additional_info,
3325                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3326 }
3327
3328 int
3329 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3330                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3331 {
3332         return query_info(xid, tcon, persistent_fid, volatile_fid,
3333                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3334                           sizeof(struct smb2_file_internal_info),
3335                           sizeof(struct smb2_file_internal_info),
3336                           (void **)&uniqueid, NULL);
3337 }
3338
3339 /*
3340  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3341  * See MS-SMB2 2.2.35 and 2.2.36
3342  */
3343
3344 static int
3345 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3346                 struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid,
3347                 u32 completion_filter, bool watch_tree)
3348 {
3349         struct smb2_change_notify_req *req;
3350         struct kvec *iov = rqst->rq_iov;
3351         unsigned int total_len;
3352         int rc;
3353
3354         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, (void **) &req, &total_len);
3355         if (rc)
3356                 return rc;
3357
3358         req->PersistentFileId = persistent_fid;
3359         req->VolatileFileId = volatile_fid;
3360         req->OutputBufferLength =
3361                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3362         req->CompletionFilter = cpu_to_le32(completion_filter);
3363         if (watch_tree)
3364                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3365         else
3366                 req->Flags = 0;
3367
3368         iov[0].iov_base = (char *)req;
3369         iov[0].iov_len = total_len;
3370
3371         return 0;
3372 }
3373
3374 int
3375 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3376                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3377                 u32 completion_filter)
3378 {
3379         struct cifs_ses *ses = tcon->ses;
3380         struct smb_rqst rqst;
3381         struct kvec iov[1];
3382         struct kvec rsp_iov = {NULL, 0};
3383         int resp_buftype = CIFS_NO_BUFFER;
3384         int flags = 0;
3385         int rc = 0;
3386
3387         cifs_dbg(FYI, "change notify\n");
3388         if (!ses || !(ses->server))
3389                 return -EIO;
3390
3391         if (smb3_encryption_required(tcon))
3392                 flags |= CIFS_TRANSFORM_REQ;
3393
3394         memset(&rqst, 0, sizeof(struct smb_rqst));
3395         memset(&iov, 0, sizeof(iov));
3396         rqst.rq_iov = iov;
3397         rqst.rq_nvec = 1;
3398
3399         rc = SMB2_notify_init(xid, &rqst, tcon, persistent_fid, volatile_fid,
3400                               completion_filter, watch_tree);
3401         if (rc)
3402                 goto cnotify_exit;
3403
3404         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3405                                 (u8)watch_tree, completion_filter);
3406         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3407
3408         if (rc != 0) {
3409                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3410                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3411                                 (u8)watch_tree, completion_filter, rc);
3412         } else
3413                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3414                                 ses->Suid, (u8)watch_tree, completion_filter);
3415
3416  cnotify_exit:
3417         if (rqst.rq_iov)
3418                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3419         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3420         return rc;
3421 }
3422
3423
3424
3425 /*
3426  * This is a no-op for now. We're not really interested in the reply, but
3427  * rather in the fact that the server sent one and that server->lstrp
3428  * gets updated.
3429  *
3430  * FIXME: maybe we should consider checking that the reply matches request?
3431  */
3432 static void
3433 smb2_echo_callback(struct mid_q_entry *mid)
3434 {
3435         struct TCP_Server_Info *server = mid->callback_data;
3436         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3437         struct cifs_credits credits = { .value = 0, .instance = 0 };
3438
3439         if (mid->mid_state == MID_RESPONSE_RECEIVED
3440             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3441                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3442                 credits.instance = server->reconnect_instance;
3443         }
3444
3445         DeleteMidQEntry(mid);
3446         add_credits(server, &credits, CIFS_ECHO_OP);
3447 }
3448
3449 void smb2_reconnect_server(struct work_struct *work)
3450 {
3451         struct TCP_Server_Info *server = container_of(work,
3452                                         struct TCP_Server_Info, reconnect.work);
3453         struct cifs_ses *ses;
3454         struct cifs_tcon *tcon, *tcon2;
3455         struct list_head tmp_list;
3456         int tcon_exist = false;
3457         int rc;
3458         int resched = false;
3459
3460
3461         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3462         mutex_lock(&server->reconnect_mutex);
3463
3464         INIT_LIST_HEAD(&tmp_list);
3465         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3466
3467         spin_lock(&cifs_tcp_ses_lock);
3468         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3469                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3470                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3471                                 tcon->tc_count++;
3472                                 list_add_tail(&tcon->rlist, &tmp_list);
3473                                 tcon_exist = true;
3474                         }
3475                 }
3476                 /*
3477                  * IPC has the same lifetime as its session and uses its
3478                  * refcount.
3479                  */
3480                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3481                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3482                         tcon_exist = true;
3483                         ses->ses_count++;
3484                 }
3485         }
3486         /*
3487          * Get the reference to server struct to be sure that the last call of
3488          * cifs_put_tcon() in the loop below won't release the server pointer.
3489          */
3490         if (tcon_exist)
3491                 server->srv_count++;
3492
3493         spin_unlock(&cifs_tcp_ses_lock);
3494
3495         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3496                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
3497                 if (!rc)
3498                         cifs_reopen_persistent_handles(tcon);
3499                 else
3500                         resched = true;
3501                 list_del_init(&tcon->rlist);
3502                 if (tcon->ipc)
3503                         cifs_put_smb_ses(tcon->ses);
3504                 else
3505                         cifs_put_tcon(tcon);
3506         }
3507
3508         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3509         if (resched)
3510                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3511         mutex_unlock(&server->reconnect_mutex);
3512
3513         /* now we can safely release srv struct */
3514         if (tcon_exist)
3515                 cifs_put_tcp_session(server, 1);
3516 }
3517
3518 int
3519 SMB2_echo(struct TCP_Server_Info *server)
3520 {
3521         struct smb2_echo_req *req;
3522         int rc = 0;
3523         struct kvec iov[1];
3524         struct smb_rqst rqst = { .rq_iov = iov,
3525                                  .rq_nvec = 1 };
3526         unsigned int total_len;
3527
3528         cifs_dbg(FYI, "In echo request\n");
3529
3530         if (server->tcpStatus == CifsNeedNegotiate) {
3531                 /* No need to send echo on newly established connections */
3532                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
3533                 return rc;
3534         }
3535
3536         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
3537         if (rc)
3538                 return rc;
3539
3540         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3541
3542         iov[0].iov_len = total_len;
3543         iov[0].iov_base = (char *)req;
3544
3545         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3546                              server, CIFS_ECHO_OP, NULL);
3547         if (rc)
3548                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3549
3550         cifs_small_buf_release(req);
3551         return rc;
3552 }
3553
3554 void
3555 SMB2_flush_free(struct smb_rqst *rqst)
3556 {
3557         if (rqst && rqst->rq_iov)
3558                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3559 }
3560
3561 int
3562 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3563                 struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid)
3564 {
3565         struct smb2_flush_req *req;
3566         struct kvec *iov = rqst->rq_iov;
3567         unsigned int total_len;
3568         int rc;
3569
3570         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
3571         if (rc)
3572                 return rc;
3573
3574         req->PersistentFileId = persistent_fid;
3575         req->VolatileFileId = volatile_fid;
3576
3577         iov[0].iov_base = (char *)req;
3578         iov[0].iov_len = total_len;
3579
3580         return 0;
3581 }
3582
3583 int
3584 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3585            u64 volatile_fid)
3586 {
3587         struct cifs_ses *ses = tcon->ses;
3588         struct smb_rqst rqst;
3589         struct kvec iov[1];
3590         struct kvec rsp_iov = {NULL, 0};
3591         int resp_buftype = CIFS_NO_BUFFER;
3592         int flags = 0;
3593         int rc = 0;
3594
3595         cifs_dbg(FYI, "flush\n");
3596         if (!ses || !(ses->server))
3597                 return -EIO;
3598
3599         if (smb3_encryption_required(tcon))
3600                 flags |= CIFS_TRANSFORM_REQ;
3601
3602         memset(&rqst, 0, sizeof(struct smb_rqst));
3603         memset(&iov, 0, sizeof(iov));
3604         rqst.rq_iov = iov;
3605         rqst.rq_nvec = 1;
3606
3607         rc = SMB2_flush_init(xid, &rqst, tcon, persistent_fid, volatile_fid);
3608         if (rc)
3609                 goto flush_exit;
3610
3611         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3612         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3613
3614         if (rc != 0) {
3615                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3616                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3617                                      rc);
3618         } else
3619                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
3620                                       ses->Suid);
3621
3622  flush_exit:
3623         SMB2_flush_free(&rqst);
3624         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3625         return rc;
3626 }
3627
3628 /*
3629  * To form a chain of read requests, any read requests after the first should
3630  * have the end_of_chain boolean set to true.
3631  */
3632 static int
3633 smb2_new_read_req(void **buf, unsigned int *total_len,
3634         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3635         unsigned int remaining_bytes, int request_type)
3636 {
3637         int rc = -EACCES;
3638         struct smb2_read_plain_req *req = NULL;
3639         struct smb2_sync_hdr *shdr;
3640         struct TCP_Server_Info *server;
3641
3642         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
3643                                  total_len);
3644         if (rc)
3645                 return rc;
3646
3647         server = io_parms->tcon->ses->server;
3648         if (server == NULL)
3649                 return -ECONNABORTED;
3650
3651         shdr = &req->sync_hdr;
3652         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3653
3654         req->PersistentFileId = io_parms->persistent_fid;
3655         req->VolatileFileId = io_parms->volatile_fid;
3656         req->ReadChannelInfoOffset = 0; /* reserved */
3657         req->ReadChannelInfoLength = 0; /* reserved */
3658         req->Channel = 0; /* reserved */
3659         req->MinimumCount = 0;
3660         req->Length = cpu_to_le32(io_parms->length);
3661         req->Offset = cpu_to_le64(io_parms->offset);
3662
3663         trace_smb3_read_enter(0 /* xid */,
3664                         io_parms->persistent_fid,
3665                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3666                         io_parms->offset, io_parms->length);
3667 #ifdef CONFIG_CIFS_SMB_DIRECT
3668         /*
3669          * If we want to do a RDMA write, fill in and append
3670          * smbd_buffer_descriptor_v1 to the end of read request
3671          */
3672         if (server->rdma && rdata && !server->sign &&
3673                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3674
3675                 struct smbd_buffer_descriptor_v1 *v1;
3676                 bool need_invalidate =
3677                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3678
3679                 rdata->mr = smbd_register_mr(
3680                                 server->smbd_conn, rdata->pages,
3681                                 rdata->nr_pages, rdata->page_offset,
3682                                 rdata->tailsz, true, need_invalidate);
3683                 if (!rdata->mr)
3684                         return -EAGAIN;
3685
3686                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3687                 if (need_invalidate)
3688                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3689                 req->ReadChannelInfoOffset =
3690                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3691                 req->ReadChannelInfoLength =
3692                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3693                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3694                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3695                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3696                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3697
3698                 *total_len += sizeof(*v1) - 1;
3699         }
3700 #endif
3701         if (request_type & CHAINED_REQUEST) {
3702                 if (!(request_type & END_OF_CHAIN)) {
3703                         /* next 8-byte aligned request */
3704                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3705                         shdr->NextCommand = cpu_to_le32(*total_len);
3706                 } else /* END_OF_CHAIN */
3707                         shdr->NextCommand = 0;
3708                 if (request_type & RELATED_REQUEST) {
3709                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3710                         /*
3711                          * Related requests use info from previous read request
3712                          * in chain.
3713                          */
3714                         shdr->SessionId = 0xFFFFFFFF;
3715                         shdr->TreeId = 0xFFFFFFFF;
3716                         req->PersistentFileId = 0xFFFFFFFF;
3717                         req->VolatileFileId = 0xFFFFFFFF;
3718                 }
3719         }
3720         if (remaining_bytes > io_parms->length)
3721                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3722         else
3723                 req->RemainingBytes = 0;
3724
3725         *buf = req;
3726         return rc;
3727 }
3728
3729 static void
3730 smb2_readv_callback(struct mid_q_entry *mid)
3731 {
3732         struct cifs_readdata *rdata = mid->callback_data;
3733         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3734         struct TCP_Server_Info *server = tcon->ses->server;
3735         struct smb2_sync_hdr *shdr =
3736                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3737         struct cifs_credits credits = { .value = 0, .instance = 0 };
3738         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
3739                                  .rq_nvec = 1,
3740                                  .rq_pages = rdata->pages,
3741                                  .rq_offset = rdata->page_offset,
3742                                  .rq_npages = rdata->nr_pages,
3743                                  .rq_pagesz = rdata->pagesz,
3744                                  .rq_tailsz = rdata->tailsz };
3745
3746         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3747                  __func__, mid->mid, mid->mid_state, rdata->result,
3748                  rdata->bytes);
3749
3750         switch (mid->mid_state) {
3751         case MID_RESPONSE_RECEIVED:
3752                 credits.value = le16_to_cpu(shdr->CreditRequest);
3753                 credits.instance = server->reconnect_instance;
3754                 /* result already set, check signature */
3755                 if (server->sign && !mid->decrypted) {
3756                         int rc;
3757
3758                         rc = smb2_verify_signature(&rqst, server);
3759                         if (rc)
3760                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
3761                                          rc);
3762                 }
3763                 /* FIXME: should this be counted toward the initiating task? */
3764                 task_io_account_read(rdata->got_bytes);
3765                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3766                 break;
3767         case MID_REQUEST_SUBMITTED:
3768         case MID_RETRY_NEEDED:
3769                 rdata->result = -EAGAIN;
3770                 if (server->sign && rdata->got_bytes)
3771                         /* reset bytes number since we can not check a sign */
3772                         rdata->got_bytes = 0;
3773                 /* FIXME: should this be counted toward the initiating task? */
3774                 task_io_account_read(rdata->got_bytes);
3775                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3776                 break;
3777         case MID_RESPONSE_MALFORMED:
3778                 credits.value = le16_to_cpu(shdr->CreditRequest);
3779                 credits.instance = server->reconnect_instance;
3780                 /* fall through */
3781         default:
3782                 rdata->result = -EIO;
3783         }
3784 #ifdef CONFIG_CIFS_SMB_DIRECT
3785         /*
3786          * If this rdata has a memmory registered, the MR can be freed
3787          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3788          * because they have limited number and are used for future I/Os
3789          */
3790         if (rdata->mr) {
3791                 smbd_deregister_mr(rdata->mr);
3792                 rdata->mr = NULL;
3793         }
3794 #endif
3795         if (rdata->result && rdata->result != -ENODATA) {
3796                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3797                 trace_smb3_read_err(0 /* xid */,
3798                                     rdata->cfile->fid.persistent_fid,
3799                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3800                                     rdata->bytes, rdata->result);
3801         } else
3802                 trace_smb3_read_done(0 /* xid */,
3803                                      rdata->cfile->fid.persistent_fid,
3804                                      tcon->tid, tcon->ses->Suid,
3805                                      rdata->offset, rdata->got_bytes);
3806
3807         queue_work(cifsiod_wq, &rdata->work);
3808         DeleteMidQEntry(mid);
3809         add_credits(server, &credits, 0);
3810 }
3811
3812 /* smb2_async_readv - send an async read, and set up mid to handle result */
3813 int
3814 smb2_async_readv(struct cifs_readdata *rdata)
3815 {
3816         int rc, flags = 0;
3817         char *buf;
3818         struct smb2_sync_hdr *shdr;
3819         struct cifs_io_parms io_parms;
3820         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3821                                  .rq_nvec = 1 };
3822         struct TCP_Server_Info *server;
3823         unsigned int total_len;
3824
3825         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3826                  __func__, rdata->offset, rdata->bytes);
3827
3828         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3829         io_parms.offset = rdata->offset;
3830         io_parms.length = rdata->bytes;
3831         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3832         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3833         io_parms.pid = rdata->pid;
3834
3835         server = io_parms.tcon->ses->server;
3836
3837         rc = smb2_new_read_req(
3838                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3839         if (rc)
3840                 return rc;
3841
3842         if (smb3_encryption_required(io_parms.tcon))
3843                 flags |= CIFS_TRANSFORM_REQ;
3844
3845         rdata->iov[0].iov_base = buf;
3846         rdata->iov[0].iov_len = total_len;
3847
3848         shdr = (struct smb2_sync_hdr *)buf;
3849
3850         if (rdata->credits.value > 0) {
3851                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3852                                                 SMB2_MAX_BUFFER_SIZE));
3853                 shdr->CreditRequest =
3854                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3855
3856                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
3857                 if (rc)
3858                         goto async_readv_out;
3859
3860                 flags |= CIFS_HAS_CREDITS;
3861         }
3862
3863         kref_get(&rdata->refcount);
3864         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3865                              cifs_readv_receive, smb2_readv_callback,
3866                              smb3_handle_read_data, rdata, flags,
3867                              &rdata->credits);
3868         if (rc) {
3869                 kref_put(&rdata->refcount, cifs_readdata_release);
3870                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3871                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
3872                                     io_parms.tcon->tid,
3873                                     io_parms.tcon->ses->Suid,
3874                                     io_parms.offset, io_parms.length, rc);
3875         }
3876
3877 async_readv_out:
3878         cifs_small_buf_release(buf);
3879         return rc;
3880 }
3881
3882 int
3883 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3884           unsigned int *nbytes, char **buf, int *buf_type)
3885 {
3886         struct smb_rqst rqst;
3887         int resp_buftype, rc;
3888         struct smb2_read_plain_req *req = NULL;
3889         struct smb2_read_rsp *rsp = NULL;
3890         struct kvec iov[1];
3891         struct kvec rsp_iov;
3892         unsigned int total_len;
3893         int flags = CIFS_LOG_ERROR;
3894         struct cifs_ses *ses = io_parms->tcon->ses;
3895
3896         *nbytes = 0;
3897         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3898         if (rc)
3899                 return rc;
3900
3901         if (smb3_encryption_required(io_parms->tcon))
3902                 flags |= CIFS_TRANSFORM_REQ;
3903
3904         iov[0].iov_base = (char *)req;
3905         iov[0].iov_len = total_len;
3906
3907         memset(&rqst, 0, sizeof(struct smb_rqst));
3908         rqst.rq_iov = iov;
3909         rqst.rq_nvec = 1;
3910
3911         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3912         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3913
3914         if (rc) {
3915                 if (rc != -ENODATA) {
3916                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3917                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3918                         trace_smb3_read_err(xid, req->PersistentFileId,
3919                                             io_parms->tcon->tid, ses->Suid,
3920                                             io_parms->offset, io_parms->length,
3921                                             rc);
3922                 } else
3923                         trace_smb3_read_done(xid, req->PersistentFileId,
3924                                     io_parms->tcon->tid, ses->Suid,
3925                                     io_parms->offset, 0);
3926                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3927                 cifs_small_buf_release(req);
3928                 return rc == -ENODATA ? 0 : rc;
3929         } else
3930                 trace_smb3_read_done(xid, req->PersistentFileId,
3931                                     io_parms->tcon->tid, ses->Suid,
3932                                     io_parms->offset, io_parms->length);
3933
3934         cifs_small_buf_release(req);
3935
3936         *nbytes = le32_to_cpu(rsp->DataLength);
3937         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3938             (*nbytes > io_parms->length)) {
3939                 cifs_dbg(FYI, "bad length %d for count %d\n",
3940                          *nbytes, io_parms->length);
3941                 rc = -EIO;
3942                 *nbytes = 0;
3943         }
3944
3945         if (*buf) {
3946                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3947                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3948         } else if (resp_buftype != CIFS_NO_BUFFER) {
3949                 *buf = rsp_iov.iov_base;
3950                 if (resp_buftype == CIFS_SMALL_BUFFER)
3951                         *buf_type = CIFS_SMALL_BUFFER;
3952                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3953                         *buf_type = CIFS_LARGE_BUFFER;
3954         }
3955         return rc;
3956 }
3957
3958 /*
3959  * Check the mid_state and signature on received buffer (if any), and queue the
3960  * workqueue completion task.
3961  */
3962 static void
3963 smb2_writev_callback(struct mid_q_entry *mid)
3964 {
3965         struct cifs_writedata *wdata = mid->callback_data;
3966         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3967         struct TCP_Server_Info *server = tcon->ses->server;
3968         unsigned int written;
3969         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3970         struct cifs_credits credits = { .value = 0, .instance = 0 };
3971
3972         switch (mid->mid_state) {
3973         case MID_RESPONSE_RECEIVED:
3974                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3975                 credits.instance = server->reconnect_instance;
3976                 wdata->result = smb2_check_receive(mid, server, 0);
3977                 if (wdata->result != 0)
3978                         break;
3979
3980                 written = le32_to_cpu(rsp->DataLength);
3981                 /*
3982                  * Mask off high 16 bits when bytes written as returned
3983                  * by the server is greater than bytes requested by the
3984                  * client. OS/2 servers are known to set incorrect
3985                  * CountHigh values.
3986                  */
3987                 if (written > wdata->bytes)
3988                         written &= 0xFFFF;
3989
3990                 if (written < wdata->bytes)
3991                         wdata->result = -ENOSPC;
3992                 else
3993                         wdata->bytes = written;
3994                 break;
3995         case MID_REQUEST_SUBMITTED:
3996         case MID_RETRY_NEEDED:
3997                 wdata->result = -EAGAIN;
3998                 break;
3999         case MID_RESPONSE_MALFORMED:
4000                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4001                 credits.instance = server->reconnect_instance;
4002                 /* fall through */
4003         default:
4004                 wdata->result = -EIO;
4005                 break;
4006         }
4007 #ifdef CONFIG_CIFS_SMB_DIRECT
4008         /*
4009          * If this wdata has a memory registered, the MR can be freed
4010          * The number of MRs available is limited, it's important to recover
4011          * used MR as soon as I/O is finished. Hold MR longer in the later
4012          * I/O process can possibly result in I/O deadlock due to lack of MR
4013          * to send request on I/O retry
4014          */
4015         if (wdata->mr) {
4016                 smbd_deregister_mr(wdata->mr);
4017                 wdata->mr = NULL;
4018         }
4019 #endif
4020         if (wdata->result) {
4021                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4022                 trace_smb3_write_err(0 /* no xid */,
4023                                      wdata->cfile->fid.persistent_fid,
4024                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4025                                      wdata->bytes, wdata->result);
4026         } else
4027                 trace_smb3_write_done(0 /* no xid */,
4028                                       wdata->cfile->fid.persistent_fid,
4029                                       tcon->tid, tcon->ses->Suid,
4030                                       wdata->offset, wdata->bytes);
4031
4032         queue_work(cifsiod_wq, &wdata->work);
4033         DeleteMidQEntry(mid);
4034         add_credits(server, &credits, 0);
4035 }
4036
4037 /* smb2_async_writev - send an async write, and set up mid to handle result */
4038 int
4039 smb2_async_writev(struct cifs_writedata *wdata,
4040                   void (*release)(struct kref *kref))
4041 {
4042         int rc = -EACCES, flags = 0;
4043         struct smb2_write_req *req = NULL;
4044         struct smb2_sync_hdr *shdr;
4045         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4046         struct TCP_Server_Info *server = tcon->ses->server;
4047         struct kvec iov[1];
4048         struct smb_rqst rqst = { };
4049         unsigned int total_len;
4050
4051         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
4052         if (rc)
4053                 return rc;
4054
4055         if (smb3_encryption_required(tcon))
4056                 flags |= CIFS_TRANSFORM_REQ;
4057
4058         shdr = (struct smb2_sync_hdr *)req;
4059         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
4060
4061         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
4062         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
4063         req->WriteChannelInfoOffset = 0;
4064         req->WriteChannelInfoLength = 0;
4065         req->Channel = 0;
4066         req->Offset = cpu_to_le64(wdata->offset);
4067         req->DataOffset = cpu_to_le16(
4068                                 offsetof(struct smb2_write_req, Buffer));
4069         req->RemainingBytes = 0;
4070
4071         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
4072                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
4073 #ifdef CONFIG_CIFS_SMB_DIRECT
4074         /*
4075          * If we want to do a server RDMA read, fill in and append
4076          * smbd_buffer_descriptor_v1 to the end of write request
4077          */
4078         if (server->rdma && !server->sign && wdata->bytes >=
4079                 server->smbd_conn->rdma_readwrite_threshold) {
4080
4081                 struct smbd_buffer_descriptor_v1 *v1;
4082                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4083
4084                 wdata->mr = smbd_register_mr(
4085                                 server->smbd_conn, wdata->pages,
4086                                 wdata->nr_pages, wdata->page_offset,
4087                                 wdata->tailsz, false, need_invalidate);
4088                 if (!wdata->mr) {
4089                         rc = -EAGAIN;
4090                         goto async_writev_out;
4091                 }
4092                 req->Length = 0;
4093                 req->DataOffset = 0;
4094                 if (wdata->nr_pages > 1)
4095                         req->RemainingBytes =
4096                                 cpu_to_le32(
4097                                         (wdata->nr_pages - 1) * wdata->pagesz -
4098                                         wdata->page_offset + wdata->tailsz
4099                                 );
4100                 else
4101                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
4102                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4103                 if (need_invalidate)
4104                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4105                 req->WriteChannelInfoOffset =
4106                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4107                 req->WriteChannelInfoLength =
4108                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4109                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4110                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4111                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4112                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4113         }
4114 #endif
4115         iov[0].iov_len = total_len - 1;
4116         iov[0].iov_base = (char *)req;
4117
4118         rqst.rq_iov = iov;
4119         rqst.rq_nvec = 1;
4120         rqst.rq_pages = wdata->pages;
4121         rqst.rq_offset = wdata->page_offset;
4122         rqst.rq_npages = wdata->nr_pages;
4123         rqst.rq_pagesz = wdata->pagesz;
4124         rqst.rq_tailsz = wdata->tailsz;
4125 #ifdef CONFIG_CIFS_SMB_DIRECT
4126         if (wdata->mr) {
4127                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4128                 rqst.rq_npages = 0;
4129         }
4130 #endif
4131         cifs_dbg(FYI, "async write at %llu %u bytes\n",
4132                  wdata->offset, wdata->bytes);
4133
4134 #ifdef CONFIG_CIFS_SMB_DIRECT
4135         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4136         if (!wdata->mr)
4137                 req->Length = cpu_to_le32(wdata->bytes);
4138 #else
4139         req->Length = cpu_to_le32(wdata->bytes);
4140 #endif
4141
4142         if (wdata->credits.value > 0) {
4143                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4144                                                     SMB2_MAX_BUFFER_SIZE));
4145                 shdr->CreditRequest =
4146                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
4147
4148                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4149                 if (rc)
4150                         goto async_writev_out;
4151
4152                 flags |= CIFS_HAS_CREDITS;
4153         }
4154
4155         kref_get(&wdata->refcount);
4156         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4157                              wdata, flags, &wdata->credits);
4158
4159         if (rc) {
4160                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
4161                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4162                                      wdata->bytes, rc);
4163                 kref_put(&wdata->refcount, release);
4164                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4165         }
4166
4167 async_writev_out:
4168         cifs_small_buf_release(req);
4169         return rc;
4170 }
4171
4172 /*
4173  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4174  * The length field from io_parms must be at least 1 and indicates a number of
4175  * elements with data to write that begins with position 1 in iov array. All
4176  * data length is specified by count.
4177  */
4178 int
4179 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4180            unsigned int *nbytes, struct kvec *iov, int n_vec)
4181 {
4182         struct smb_rqst rqst;
4183         int rc = 0;
4184         struct smb2_write_req *req = NULL;
4185         struct smb2_write_rsp *rsp = NULL;
4186         int resp_buftype;
4187         struct kvec rsp_iov;
4188         int flags = 0;
4189         unsigned int total_len;
4190
4191         *nbytes = 0;
4192
4193         if (n_vec < 1)
4194                 return rc;
4195
4196         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
4197                              &total_len);
4198         if (rc)
4199                 return rc;
4200
4201         if (io_parms->tcon->ses->server == NULL)
4202                 return -ECONNABORTED;
4203
4204         if (smb3_encryption_required(io_parms->tcon))
4205                 flags |= CIFS_TRANSFORM_REQ;
4206
4207         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
4208
4209         req->PersistentFileId = io_parms->persistent_fid;
4210         req->VolatileFileId = io_parms->volatile_fid;
4211         req->WriteChannelInfoOffset = 0;
4212         req->WriteChannelInfoLength = 0;
4213         req->Channel = 0;
4214         req->Length = cpu_to_le32(io_parms->length);
4215         req->Offset = cpu_to_le64(io_parms->offset);
4216         req->DataOffset = cpu_to_le16(
4217                                 offsetof(struct smb2_write_req, Buffer));
4218         req->RemainingBytes = 0;
4219
4220         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4221                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4222                 io_parms->offset, io_parms->length);
4223
4224         iov[0].iov_base = (char *)req;
4225         /* 1 for Buffer */
4226         iov[0].iov_len = total_len - 1;
4227
4228         memset(&rqst, 0, sizeof(struct smb_rqst));
4229         rqst.rq_iov = iov;
4230         rqst.rq_nvec = n_vec + 1;
4231
4232         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
4233                             &resp_buftype, flags, &rsp_iov);
4234         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4235
4236         if (rc) {
4237                 trace_smb3_write_err(xid, req->PersistentFileId,
4238                                      io_parms->tcon->tid,
4239                                      io_parms->tcon->ses->Suid,
4240                                      io_parms->offset, io_parms->length, rc);
4241                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4242                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4243         } else {
4244                 *nbytes = le32_to_cpu(rsp->DataLength);
4245                 trace_smb3_write_done(xid, req->PersistentFileId,
4246                                      io_parms->tcon->tid,
4247                                      io_parms->tcon->ses->Suid,
4248                                      io_parms->offset, *nbytes);
4249         }
4250
4251         cifs_small_buf_release(req);
4252         free_rsp_buf(resp_buftype, rsp);
4253         return rc;
4254 }
4255
4256 static unsigned int
4257 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
4258 {
4259         int len;
4260         unsigned int entrycount = 0;
4261         unsigned int next_offset = 0;
4262         char *entryptr;
4263         FILE_DIRECTORY_INFO *dir_info;
4264
4265         if (bufstart == NULL)
4266                 return 0;
4267
4268         entryptr = bufstart;
4269
4270         while (1) {
4271                 if (entryptr + next_offset < entryptr ||
4272                     entryptr + next_offset > end_of_buf ||
4273                     entryptr + next_offset + size > end_of_buf) {
4274                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4275                         break;
4276                 }
4277
4278                 entryptr = entryptr + next_offset;
4279                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4280
4281                 len = le32_to_cpu(dir_info->FileNameLength);
4282                 if (entryptr + len < entryptr ||
4283                     entryptr + len > end_of_buf ||
4284                     entryptr + len + size > end_of_buf) {
4285                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4286                                  end_of_buf);
4287                         break;
4288                 }
4289
4290                 *lastentry = entryptr;
4291                 entrycount++;
4292
4293                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4294                 if (!next_offset)
4295                         break;
4296         }
4297
4298         return entrycount;
4299 }
4300
4301 /*
4302  * Readdir/FindFirst
4303  */
4304 int SMB2_query_directory_init(const unsigned int xid,
4305                               struct cifs_tcon *tcon, struct smb_rqst *rqst,
4306                               u64 persistent_fid, u64 volatile_fid,
4307                               int index, int info_level)
4308 {
4309         struct TCP_Server_Info *server = tcon->ses->server;
4310         struct smb2_query_directory_req *req;
4311         unsigned char *bufptr;
4312         __le16 asteriks = cpu_to_le16('*');
4313         unsigned int output_size = CIFSMaxBufSize -
4314                 MAX_SMB2_CREATE_RESPONSE_SIZE -
4315                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
4316         unsigned int total_len;
4317         struct kvec *iov = rqst->rq_iov;
4318         int len, rc;
4319
4320         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
4321                              &total_len);
4322         if (rc)
4323                 return rc;
4324
4325         switch (info_level) {
4326         case SMB_FIND_FILE_DIRECTORY_INFO:
4327                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4328                 break;
4329         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4330                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4331                 break;
4332         default:
4333                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4334                         info_level);
4335                 return -EINVAL;
4336         }
4337
4338         req->FileIndex = cpu_to_le32(index);
4339         req->PersistentFileId = persistent_fid;
4340         req->VolatileFileId = volatile_fid;
4341
4342         len = 0x2;
4343         bufptr = req->Buffer;
4344         memcpy(bufptr, &asteriks, len);
4345
4346         req->FileNameOffset =
4347                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4348         req->FileNameLength = cpu_to_le16(len);
4349         /*
4350          * BB could be 30 bytes or so longer if we used SMB2 specific
4351          * buffer lengths, but this is safe and close enough.
4352          */
4353         output_size = min_t(unsigned int, output_size, server->maxBuf);
4354         output_size = min_t(unsigned int, output_size, 2 << 15);
4355         req->OutputBufferLength = cpu_to_le32(output_size);
4356
4357         iov[0].iov_base = (char *)req;
4358         /* 1 for Buffer */
4359         iov[0].iov_len = total_len - 1;
4360
4361         iov[1].iov_base = (char *)(req->Buffer);
4362         iov[1].iov_len = len;
4363
4364         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4365                         tcon->ses->Suid, index, output_size);
4366
4367         return 0;
4368 }
4369
4370 void SMB2_query_directory_free(struct smb_rqst *rqst)
4371 {
4372         if (rqst && rqst->rq_iov) {
4373                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4374         }
4375 }
4376
4377 int
4378 smb2_parse_query_directory(struct cifs_tcon *tcon,
4379                            struct kvec *rsp_iov,
4380                            int resp_buftype,
4381                            struct cifs_search_info *srch_inf)
4382 {
4383         struct smb2_query_directory_rsp *rsp;
4384         size_t info_buf_size;
4385         char *end_of_smb;
4386         int rc;
4387
4388         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4389
4390         switch (srch_inf->info_level) {
4391         case SMB_FIND_FILE_DIRECTORY_INFO:
4392                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4393                 break;
4394         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4395                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4396                 break;
4397         default:
4398                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4399                          srch_inf->info_level);
4400                 return -EINVAL;
4401         }
4402
4403         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4404                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4405                                info_buf_size);
4406         if (rc)
4407                 return rc;
4408
4409         srch_inf->unicode = true;
4410
4411         if (srch_inf->ntwrk_buf_start) {
4412                 if (srch_inf->smallBuf)
4413                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4414                 else
4415                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4416         }
4417         srch_inf->ntwrk_buf_start = (char *)rsp;
4418         srch_inf->srch_entries_start = srch_inf->last_entry =
4419                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4420         end_of_smb = rsp_iov->iov_len + (char *)rsp;
4421         srch_inf->entries_in_buffer =
4422                         num_entries(srch_inf->srch_entries_start, end_of_smb,
4423                                     &srch_inf->last_entry, info_buf_size);
4424         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4425         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4426                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4427                  srch_inf->srch_entries_start, srch_inf->last_entry);
4428         if (resp_buftype == CIFS_LARGE_BUFFER)
4429                 srch_inf->smallBuf = false;
4430         else if (resp_buftype == CIFS_SMALL_BUFFER)
4431                 srch_inf->smallBuf = true;
4432         else
4433                 cifs_tcon_dbg(VFS, "illegal search buffer type\n");
4434
4435         return 0;
4436 }
4437
4438 int
4439 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4440                      u64 persistent_fid, u64 volatile_fid, int index,
4441                      struct cifs_search_info *srch_inf)
4442 {
4443         struct smb_rqst rqst;
4444         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
4445         struct smb2_query_directory_rsp *rsp = NULL;
4446         int resp_buftype = CIFS_NO_BUFFER;
4447         struct kvec rsp_iov;
4448         int rc = 0;
4449         struct cifs_ses *ses = tcon->ses;
4450         int flags = 0;
4451
4452         if (!ses || !(ses->server))
4453                 return -EIO;
4454
4455         if (smb3_encryption_required(tcon))
4456                 flags |= CIFS_TRANSFORM_REQ;
4457
4458         memset(&rqst, 0, sizeof(struct smb_rqst));
4459         memset(&iov, 0, sizeof(iov));
4460         rqst.rq_iov = iov;
4461         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
4462
4463         rc = SMB2_query_directory_init(xid, tcon, &rqst, persistent_fid,
4464                                        volatile_fid, index,
4465                                        srch_inf->info_level);
4466         if (rc)
4467                 goto qdir_exit;
4468
4469         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4470         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4471
4472         if (rc) {
4473                 if (rc == -ENODATA &&
4474                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4475                         trace_smb3_query_dir_done(xid, persistent_fid,
4476                                 tcon->tid, tcon->ses->Suid, index, 0);
4477                         srch_inf->endOfSearch = true;
4478                         rc = 0;
4479                 } else {
4480                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4481                                 tcon->ses->Suid, index, 0, rc);
4482                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4483                 }
4484                 goto qdir_exit;
4485         }
4486
4487         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
4488                                         srch_inf);
4489         if (rc) {
4490                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4491                         tcon->ses->Suid, index, 0, rc);
4492                 goto qdir_exit;
4493         }
4494         resp_buftype = CIFS_NO_BUFFER;
4495
4496         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4497                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4498
4499 qdir_exit:
4500         SMB2_query_directory_free(&rqst);
4501         free_rsp_buf(resp_buftype, rsp);
4502         return rc;
4503 }
4504
4505 int
4506 SMB2_set_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
4507                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4508                u8 info_type, u32 additional_info,
4509                 void **data, unsigned int *size)
4510 {
4511         struct smb2_set_info_req *req;
4512         struct kvec *iov = rqst->rq_iov;
4513         unsigned int i, total_len;
4514         int rc;
4515
4516         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
4517         if (rc)
4518                 return rc;
4519
4520         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4521         req->InfoType = info_type;
4522         req->FileInfoClass = info_class;
4523         req->PersistentFileId = persistent_fid;
4524         req->VolatileFileId = volatile_fid;
4525         req->AdditionalInformation = cpu_to_le32(additional_info);
4526
4527         req->BufferOffset =
4528                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4529         req->BufferLength = cpu_to_le32(*size);
4530
4531         memcpy(req->Buffer, *data, *size);
4532         total_len += *size;
4533
4534         iov[0].iov_base = (char *)req;
4535         /* 1 for Buffer */
4536         iov[0].iov_len = total_len - 1;
4537
4538         for (i = 1; i < rqst->rq_nvec; i++) {
4539                 le32_add_cpu(&req->BufferLength, size[i]);
4540                 iov[i].iov_base = (char *)data[i];
4541                 iov[i].iov_len = size[i];
4542         }
4543
4544         return 0;
4545 }
4546
4547 void
4548 SMB2_set_info_free(struct smb_rqst *rqst)
4549 {
4550         if (rqst && rqst->rq_iov)
4551                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4552 }
4553
4554 static int
4555 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4556                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4557                u8 info_type, u32 additional_info, unsigned int num,
4558                 void **data, unsigned int *size)
4559 {
4560         struct smb_rqst rqst;
4561         struct smb2_set_info_rsp *rsp = NULL;
4562         struct kvec *iov;
4563         struct kvec rsp_iov;
4564         int rc = 0;
4565         int resp_buftype;
4566         struct cifs_ses *ses = tcon->ses;
4567         int flags = 0;
4568
4569         if (!ses || !(ses->server))
4570                 return -EIO;
4571
4572         if (!num)
4573                 return -EINVAL;
4574
4575         if (smb3_encryption_required(tcon))
4576                 flags |= CIFS_TRANSFORM_REQ;
4577
4578         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4579         if (!iov)
4580                 return -ENOMEM;
4581
4582         memset(&rqst, 0, sizeof(struct smb_rqst));
4583         rqst.rq_iov = iov;
4584         rqst.rq_nvec = num;
4585
4586         rc = SMB2_set_info_init(tcon, &rqst, persistent_fid, volatile_fid, pid,
4587                                 info_class, info_type, additional_info,
4588                                 data, size);
4589         if (rc) {
4590                 kfree(iov);
4591                 return rc;
4592         }
4593
4594
4595         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
4596                             &rsp_iov);
4597         SMB2_set_info_free(&rqst);
4598         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4599
4600         if (rc != 0) {
4601                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4602                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4603                                 ses->Suid, info_class, (__u32)info_type, rc);
4604         }
4605
4606         free_rsp_buf(resp_buftype, rsp);
4607         kfree(iov);
4608         return rc;
4609 }
4610
4611 int
4612 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4613              u64 volatile_fid, u32 pid, __le64 *eof)
4614 {
4615         struct smb2_file_eof_info info;
4616         void *data;
4617         unsigned int size;
4618
4619         info.EndOfFile = *eof;
4620
4621         data = &info;
4622         size = sizeof(struct smb2_file_eof_info);
4623
4624         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4625                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4626                         0, 1, &data, &size);
4627 }
4628
4629 int
4630 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4631                 u64 persistent_fid, u64 volatile_fid,
4632                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4633 {
4634         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4635                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4636                         1, (void **)&pnntsd, &pacllen);
4637 }
4638
4639 int
4640 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4641             u64 persistent_fid, u64 volatile_fid,
4642             struct smb2_file_full_ea_info *buf, int len)
4643 {
4644         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4645                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4646                 0, 1, (void **)&buf, &len);
4647 }
4648
4649 int
4650 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4651                   const u64 persistent_fid, const u64 volatile_fid,
4652                   __u8 oplock_level)
4653 {
4654         struct smb_rqst rqst;
4655         int rc;
4656         struct smb2_oplock_break *req = NULL;
4657         struct cifs_ses *ses = tcon->ses;
4658         int flags = CIFS_OBREAK_OP;
4659         unsigned int total_len;
4660         struct kvec iov[1];
4661         struct kvec rsp_iov;
4662         int resp_buf_type;
4663
4664         cifs_dbg(FYI, "SMB2_oplock_break\n");
4665         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4666                              &total_len);
4667         if (rc)
4668                 return rc;
4669
4670         if (smb3_encryption_required(tcon))
4671                 flags |= CIFS_TRANSFORM_REQ;
4672
4673         req->VolatileFid = volatile_fid;
4674         req->PersistentFid = persistent_fid;
4675         req->OplockLevel = oplock_level;
4676         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4677
4678         flags |= CIFS_NO_RSP_BUF;
4679
4680         iov[0].iov_base = (char *)req;
4681         iov[0].iov_len = total_len;
4682
4683         memset(&rqst, 0, sizeof(struct smb_rqst));
4684         rqst.rq_iov = iov;
4685         rqst.rq_nvec = 1;
4686
4687         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4688         cifs_small_buf_release(req);
4689
4690         if (rc) {
4691                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4692                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
4693         }
4694
4695         return rc;
4696 }
4697
4698 void
4699 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
4700                              struct kstatfs *kst)
4701 {
4702         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
4703                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
4704         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
4705         kst->f_bfree  = kst->f_bavail =
4706                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
4707         return;
4708 }
4709
4710 static void
4711 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
4712                         struct kstatfs *kst)
4713 {
4714         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
4715         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
4716         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
4717         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
4718                 kst->f_bavail = kst->f_bfree;
4719         else
4720                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
4721         if (response_data->TotalFileNodes != cpu_to_le64(-1))
4722                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
4723         if (response_data->FreeFileNodes != cpu_to_le64(-1))
4724                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
4725
4726         return;
4727 }
4728
4729 static int
4730 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
4731                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
4732 {
4733         int rc;
4734         struct smb2_query_info_req *req;
4735         unsigned int total_len;
4736
4737         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
4738
4739         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
4740                 return -EIO;
4741
4742         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
4743                              &total_len);
4744         if (rc)
4745                 return rc;
4746
4747         req->InfoType = SMB2_O_INFO_FILESYSTEM;
4748         req->FileInfoClass = level;
4749         req->PersistentFileId = persistent_fid;
4750         req->VolatileFileId = volatile_fid;
4751         /* 1 for pad */
4752         req->InputBufferOffset =
4753                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4754         req->OutputBufferLength = cpu_to_le32(
4755                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4756
4757         iov->iov_base = (char *)req;
4758         iov->iov_len = total_len;
4759         return 0;
4760 }
4761
4762 int
4763 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4764               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4765 {
4766         struct smb_rqst rqst;
4767         struct smb2_query_info_rsp *rsp = NULL;
4768         struct kvec iov;
4769         struct kvec rsp_iov;
4770         int rc = 0;
4771         int resp_buftype;
4772         struct cifs_ses *ses = tcon->ses;
4773         FILE_SYSTEM_POSIX_INFO *info = NULL;
4774         int flags = 0;
4775
4776         rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4777                                 sizeof(FILE_SYSTEM_POSIX_INFO),
4778                                 persistent_fid, volatile_fid);
4779         if (rc)
4780                 return rc;
4781
4782         if (smb3_encryption_required(tcon))
4783                 flags |= CIFS_TRANSFORM_REQ;
4784
4785         memset(&rqst, 0, sizeof(struct smb_rqst));
4786         rqst.rq_iov = &iov;
4787         rqst.rq_nvec = 1;
4788
4789         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4790         cifs_small_buf_release(iov.iov_base);
4791         if (rc) {
4792                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4793                 goto posix_qfsinf_exit;
4794         }
4795         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4796
4797         info = (FILE_SYSTEM_POSIX_INFO *)(
4798                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4799         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4800                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4801                                sizeof(FILE_SYSTEM_POSIX_INFO));
4802         if (!rc)
4803                 copy_posix_fs_info_to_kstatfs(info, fsdata);
4804
4805 posix_qfsinf_exit:
4806         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4807         return rc;
4808 }
4809
4810 int
4811 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
4812               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4813 {
4814         struct smb_rqst rqst;
4815         struct smb2_query_info_rsp *rsp = NULL;
4816         struct kvec iov;
4817         struct kvec rsp_iov;
4818         int rc = 0;
4819         int resp_buftype;
4820         struct cifs_ses *ses = tcon->ses;
4821         struct smb2_fs_full_size_info *info = NULL;
4822         int flags = 0;
4823
4824         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
4825                                 sizeof(struct smb2_fs_full_size_info),
4826                                 persistent_fid, volatile_fid);
4827         if (rc)
4828                 return rc;
4829
4830         if (smb3_encryption_required(tcon))
4831                 flags |= CIFS_TRANSFORM_REQ;
4832
4833         memset(&rqst, 0, sizeof(struct smb_rqst));
4834         rqst.rq_iov = &iov;
4835         rqst.rq_nvec = 1;
4836
4837         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4838         cifs_small_buf_release(iov.iov_base);
4839         if (rc) {
4840                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4841                 goto qfsinf_exit;
4842         }
4843         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4844
4845         info = (struct smb2_fs_full_size_info *)(
4846                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4847         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4848                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4849                                sizeof(struct smb2_fs_full_size_info));
4850         if (!rc)
4851                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
4852
4853 qfsinf_exit:
4854         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4855         return rc;
4856 }
4857
4858 int
4859 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4860               u64 persistent_fid, u64 volatile_fid, int level)
4861 {
4862         struct smb_rqst rqst;
4863         struct smb2_query_info_rsp *rsp = NULL;
4864         struct kvec iov;
4865         struct kvec rsp_iov;
4866         int rc = 0;
4867         int resp_buftype, max_len, min_len;
4868         struct cifs_ses *ses = tcon->ses;
4869         unsigned int rsp_len, offset;
4870         int flags = 0;
4871
4872         if (level == FS_DEVICE_INFORMATION) {
4873                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4874                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4875         } else if (level == FS_ATTRIBUTE_INFORMATION) {
4876                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4877                 min_len = MIN_FS_ATTR_INFO_SIZE;
4878         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4879                 max_len = sizeof(struct smb3_fs_ss_info);
4880                 min_len = sizeof(struct smb3_fs_ss_info);
4881         } else if (level == FS_VOLUME_INFORMATION) {
4882                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
4883                 min_len = sizeof(struct smb3_fs_vol_info);
4884         } else {
4885                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4886                 return -EINVAL;
4887         }
4888
4889         rc = build_qfs_info_req(&iov, tcon, level, max_len,
4890                                 persistent_fid, volatile_fid);
4891         if (rc)
4892                 return rc;
4893
4894         if (smb3_encryption_required(tcon))
4895                 flags |= CIFS_TRANSFORM_REQ;
4896
4897         memset(&rqst, 0, sizeof(struct smb_rqst));
4898         rqst.rq_iov = &iov;
4899         rqst.rq_nvec = 1;
4900
4901         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4902         cifs_small_buf_release(iov.iov_base);
4903         if (rc) {
4904                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4905                 goto qfsattr_exit;
4906         }
4907         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4908
4909         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4910         offset = le16_to_cpu(rsp->OutputBufferOffset);
4911         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
4912         if (rc)
4913                 goto qfsattr_exit;
4914
4915         if (level == FS_ATTRIBUTE_INFORMATION)
4916                 memcpy(&tcon->fsAttrInfo, offset
4917                         + (char *)rsp, min_t(unsigned int,
4918                         rsp_len, max_len));
4919         else if (level == FS_DEVICE_INFORMATION)
4920                 memcpy(&tcon->fsDevInfo, offset
4921                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4922         else if (level == FS_SECTOR_SIZE_INFORMATION) {
4923                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4924                         (offset + (char *)rsp);
4925                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4926                 tcon->perf_sector_size =
4927                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4928         } else if (level == FS_VOLUME_INFORMATION) {
4929                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
4930                         (offset + (char *)rsp);
4931                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
4932                 tcon->vol_create_time = vol_info->VolumeCreationTime;
4933         }
4934
4935 qfsattr_exit:
4936         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4937         return rc;
4938 }
4939
4940 int
4941 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4942            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4943            const __u32 num_lock, struct smb2_lock_element *buf)
4944 {
4945         struct smb_rqst rqst;
4946         int rc = 0;
4947         struct smb2_lock_req *req = NULL;
4948         struct kvec iov[2];
4949         struct kvec rsp_iov;
4950         int resp_buf_type;
4951         unsigned int count;
4952         int flags = CIFS_NO_RSP_BUF;
4953         unsigned int total_len;
4954
4955         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4956
4957         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4958         if (rc)
4959                 return rc;
4960
4961         if (smb3_encryption_required(tcon))
4962                 flags |= CIFS_TRANSFORM_REQ;
4963
4964         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4965         req->LockCount = cpu_to_le16(num_lock);
4966
4967         req->PersistentFileId = persist_fid;
4968         req->VolatileFileId = volatile_fid;
4969
4970         count = num_lock * sizeof(struct smb2_lock_element);
4971
4972         iov[0].iov_base = (char *)req;
4973         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4974         iov[1].iov_base = (char *)buf;
4975         iov[1].iov_len = count;
4976
4977         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4978
4979         memset(&rqst, 0, sizeof(struct smb_rqst));
4980         rqst.rq_iov = iov;
4981         rqst.rq_nvec = 2;
4982
4983         rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4984                             &rsp_iov);
4985         cifs_small_buf_release(req);
4986         if (rc) {
4987                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4988                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4989                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4990                                     tcon->ses->Suid, rc);
4991         }
4992
4993         return rc;
4994 }
4995
4996 int
4997 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
4998           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4999           const __u64 length, const __u64 offset, const __u32 lock_flags,
5000           const bool wait)
5001 {
5002         struct smb2_lock_element lock;
5003
5004         lock.Offset = cpu_to_le64(offset);
5005         lock.Length = cpu_to_le64(length);
5006         lock.Flags = cpu_to_le32(lock_flags);
5007         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5008                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5009
5010         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5011 }
5012
5013 int
5014 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5015                  __u8 *lease_key, const __le32 lease_state)
5016 {
5017         struct smb_rqst rqst;
5018         int rc;
5019         struct smb2_lease_ack *req = NULL;
5020         struct cifs_ses *ses = tcon->ses;
5021         int flags = CIFS_OBREAK_OP;
5022         unsigned int total_len;
5023         struct kvec iov[1];
5024         struct kvec rsp_iov;
5025         int resp_buf_type;
5026         __u64 *please_key_high;
5027         __u64 *please_key_low;
5028
5029         cifs_dbg(FYI, "SMB2_lease_break\n");
5030         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
5031                              &total_len);
5032         if (rc)
5033                 return rc;
5034
5035         if (smb3_encryption_required(tcon))
5036                 flags |= CIFS_TRANSFORM_REQ;
5037
5038         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5039         req->StructureSize = cpu_to_le16(36);
5040         total_len += 12;
5041
5042         memcpy(req->LeaseKey, lease_key, 16);
5043         req->LeaseState = lease_state;
5044
5045         flags |= CIFS_NO_RSP_BUF;
5046
5047         iov[0].iov_base = (char *)req;
5048         iov[0].iov_len = total_len;
5049
5050         memset(&rqst, 0, sizeof(struct smb_rqst));
5051         rqst.rq_iov = iov;
5052         rqst.rq_nvec = 1;
5053
5054         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
5055         cifs_small_buf_release(req);
5056
5057         please_key_low = (__u64 *)lease_key;
5058         please_key_high = (__u64 *)(lease_key+8);
5059         if (rc) {
5060                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5061                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5062                         ses->Suid, *please_key_low, *please_key_high, rc);
5063                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5064         } else
5065                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5066                         ses->Suid, *please_key_low, *please_key_high);
5067
5068         return rc;
5069 }