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 ([email protected])
   7  *              Pavel Shilovsky ([email protected]) 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 || !tcon->ses)
  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                   struct TCP_Server_Info *server)
 103 {
 104         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 105         shdr->StructureSize = cpu_to_le16(64);
 106         shdr->Command = smb2_cmd;
 107         if (server) {
 108                 spin_lock(&server->req_lock);
 109                 /* Request up to 10 credits but don't go over the limit. */
 110                 if (server->credits >= server->max_credits)
 111                         shdr->CreditRequest = cpu_to_le16(0);
 112                 else
 113                         shdr->CreditRequest = cpu_to_le16(
 114                                 min_t(int, server->max_credits -
 115                                                 server->credits, 10));
 116                 spin_unlock(&server->req_lock);
 117         } else {
 118                 shdr->CreditRequest = cpu_to_le16(2);
 119         }
 120         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 121
 122         if (!tcon)
 123                 goto out;
 124
 125         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 126         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 127         if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 128                 shdr->CreditCharge = cpu_to_le16(1);
 129         /* else CreditCharge MBZ */
 130
 131         shdr->TreeId = tcon->tid;
 132         /* Uid is not converted */
 133         if (tcon->ses)
 134                 shdr->SessionId = tcon->ses->Suid;
 135
 136         /*
 137          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 138          * to pass the path on the Open SMB prefixed by \\server\share.
 139          * Not sure when we would need to do the augmented path (if ever) and
 140          * setting this flag breaks the SMB2 open operation since it is
 141          * illegal to send an empty path name (without \\server\share prefix)
 142          * when the DFS flag is set in the SMB open header. We could
 143          * consider setting the flag on all operations other than open
 144          * but it is safer to net set it for now.
 145          */
 146 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 147                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 148
 149         if (server && server->sign && !smb3_encryption_required(tcon))
 150                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 151 out:
 152         return;
 153 }
 154
 155 static int
 156 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
 157                struct TCP_Server_Info *server)
 158 {
 159         int rc;
 160         struct nls_table *nls_codepage;
 161         struct cifs_ses *ses;
 162         int retries;
 163
 164         /*
 165          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 166          * check for tcp and smb session status done differently
 167          * for those three - in the calling routine.
 168          */
 169         if (tcon == NULL)
 170                 return 0;
 171
 172         if (smb2_command == SMB2_TREE_CONNECT)
 173                 return 0;
 174
 175         if (tcon->tidStatus == CifsExiting) {
 176                 /*
 177                  * only tree disconnect, open, and write,
 178                  * (and ulogoff which does not have tcon)
 179                  * are allowed as we start force umount.
 180                  */
 181                 if ((smb2_command != SMB2_WRITE) &&
 182                    (smb2_command != SMB2_CREATE) &&
 183                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 184                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 185                                  smb2_command);
 186                         return -ENODEV;
 187                 }
 188         }
 189         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 190             (!tcon->ses->server) || !server)
 191                 return -EIO;
 192
 193         ses = tcon->ses;
 194         retries = server->nr_targets;
 195
 196         /*
 197          * Give demultiplex thread up to 10 seconds to each target available for
 198          * reconnect -- should be greater than cifs socket timeout which is 7
 199          * seconds.
 200          */
 201         while (server->tcpStatus == CifsNeedReconnect) {
 202                 /*
 203                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 204                  * here since they are implicitly done when session drops.
 205                  */
 206                 switch (smb2_command) {
 207                 /*
 208                  * BB Should we keep oplock break and add flush to exceptions?
 209                  */
 210                 case SMB2_TREE_DISCONNECT:
 211                 case SMB2_CANCEL:
 212                 case SMB2_CLOSE:
 213                 case SMB2_OPLOCK_BREAK:
 214                         return -EAGAIN;
 215                 }
 216
 217                 rc = wait_event_interruptible_timeout(server->response_q,
 218                                                       (server->tcpStatus != CifsNeedReconnect),
 219                                                       10 * HZ);
 220                 if (rc < 0) {
 221                         cifs_dbg(FYI, "%s: aborting reconnect due to a received signal by the process\n",
 222                                  __func__);
 223                         return -ERESTARTSYS;
 224                 }
 225
 226                 /* are we still trying to reconnect? */
 227                 if (server->tcpStatus != CifsNeedReconnect)
 228                         break;
 229
 230                 if (retries && --retries)
 231                         continue;
 232
 233                 /*
 234                  * on "soft" mounts we wait once. Hard mounts keep
 235                  * retrying until process is killed or server comes
 236                  * back on-line
 237                  */
 238                 if (!tcon->retry) {
 239                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 240                         return -EHOSTDOWN;
 241                 }
 242                 retries = server->nr_targets;
 243         }
 244
 245         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 246                 return 0;
 247
 248         nls_codepage = load_nls_default();
 249
 250         /*
 251          * need to prevent multiple threads trying to simultaneously reconnect
 252          * the same SMB session
 253          */
 254         mutex_lock(&tcon->ses->session_mutex);
 255
 256         /*
 257          * Recheck after acquire mutex. If another thread is negotiating
 258          * and the server never sends an answer the socket will be closed
 259          * and tcpStatus set to reconnect.
 260          */
 261         if (server->tcpStatus == CifsNeedReconnect) {
 262                 rc = -EHOSTDOWN;
 263                 mutex_unlock(&tcon->ses->session_mutex);
 264                 goto out;
 265         }
 266
 267         /*
 268          * If we are reconnecting an extra channel, bind
 269          */
 270         if (server->is_channel) {
 271                 ses->binding = true;
 272                 ses->binding_chan = cifs_ses_find_chan(ses, server);
 273         }
 274
 275         rc = cifs_negotiate_protocol(0, tcon->ses);
 276         if (!rc && tcon->ses->need_reconnect) {
 277                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 278                 if ((rc == -EACCES) && !tcon->retry) {
 279                         rc = -EHOSTDOWN;
 280                         ses->binding = false;
 281                         ses->binding_chan = NULL;
 282                         mutex_unlock(&tcon->ses->session_mutex);
 283                         goto failed;
 284                 }
 285         }
 286         /*
 287          * End of channel binding
 288          */
 289         ses->binding = false;
 290         ses->binding_chan = NULL;
 291
 292         if (rc || !tcon->need_reconnect) {
 293                 mutex_unlock(&tcon->ses->session_mutex);
 294                 goto out;
 295         }
 296
 297         cifs_mark_open_files_invalid(tcon);
 298         if (tcon->use_persistent)
 299                 tcon->need_reopen_files = true;
 300
 301         rc = cifs_tree_connect(0, tcon, nls_codepage);
 302         mutex_unlock(&tcon->ses->session_mutex);
 303
 304         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 305         if (rc) {
 306                 /* If sess reconnected but tcon didn't, something strange ... */
 307                 pr_warn_once("reconnect tcon failed rc = %d\n", rc);
 308                 goto out;
 309         }
 310
 311         if (smb2_command != SMB2_INTERNAL_CMD)
 312                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
 313
 314         atomic_inc(&tconInfoReconnectCount);
 315 out:
 316         /*
 317          * Check if handle based operation so we know whether we can continue
 318          * or not without returning to caller to reset file handle.
 319          */
 320         /*
 321          * BB Is flush done by server on drop of tcp session? Should we special
 322          * case it and skip above?
 323          */
 324         switch (smb2_command) {
 325         case SMB2_FLUSH:
 326         case SMB2_READ:
 327         case SMB2_WRITE:
 328         case SMB2_LOCK:
 329         case SMB2_IOCTL:
 330         case SMB2_QUERY_DIRECTORY:
 331         case SMB2_CHANGE_NOTIFY:
 332         case SMB2_QUERY_INFO:
 333         case SMB2_SET_INFO:
 334                 rc = -EAGAIN;
 335         }
 336 failed:
 337         unload_nls(nls_codepage);
 338         return rc;
 339 }
 340
 341 static void
 342 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
 343                struct TCP_Server_Info *server,
 344                void *buf,
 345                unsigned int *total_len)
 346 {
 347         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 348         /* lookup word count ie StructureSize from table */
 349         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 350
 351         /*
 352          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 353          * largest operations (Create)
 354          */
 355         memset(buf, 0, 256);
 356
 357         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon, server);
 358         spdu->StructureSize2 = cpu_to_le16(parmsize);
 359
 360         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 361 }
 362
 363 /*
 364  * Allocate and return pointer to an SMB request hdr, and set basic
 365  * SMB information in the SMB header. If the return code is zero, this
 366  * function must have filled in request_buf pointer.
 367  */
 368 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 369                                  struct TCP_Server_Info *server,
 370                                  void **request_buf, unsigned int *total_len)
 371 {
 372         /* BB eventually switch this to SMB2 specific small buf size */
 373         if (smb2_command == SMB2_SET_INFO)
 374                 *request_buf = cifs_buf_get();
 375         else
 376                 *request_buf = cifs_small_buf_get();
 377         if (*request_buf == NULL) {
 378                 /* BB should we add a retry in here if not a writepage? */
 379                 return -ENOMEM;
 380         }
 381
 382         fill_small_buf(smb2_command, tcon, server,
 383                        (struct smb2_sync_hdr *)(*request_buf),
 384                        total_len);
 385
 386         if (tcon != NULL) {
 387                 uint16_t com_code = le16_to_cpu(smb2_command);
 388                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 389                 cifs_stats_inc(&tcon->num_smbs_sent);
 390         }
 391
 392         return 0;
 393 }
 394
 395 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 396                                struct TCP_Server_Info *server,
 397                                void **request_buf, unsigned int *total_len)
 398 {
 399         int rc;
 400
 401         rc = smb2_reconnect(smb2_command, tcon, server);
 402         if (rc)
 403                 return rc;
 404
 405         return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
 406                                      total_len);
 407 }
 408
 409 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 410                                struct TCP_Server_Info *server,
 411                                void **request_buf, unsigned int *total_len)
 412 {
 413         /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
 414         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
 415                 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 416                                              request_buf, total_len);
 417         }
 418         return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 419                                    request_buf, total_len);
 420 }
 421
 422 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 423
 424 static void
 425 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 426 {
 427         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 428         pneg_ctxt->DataLength = cpu_to_le16(38);
 429         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 430         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_LINUX_CLIENT_SALT_SIZE);
 431         get_random_bytes(pneg_ctxt->Salt, SMB311_LINUX_CLIENT_SALT_SIZE);
 432         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 433 }
 434
 435 static void
 436 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 437 {
 438         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 439         pneg_ctxt->DataLength =
 440                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 441                           - sizeof(struct smb2_neg_context));
 442         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 443         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 444         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 445         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 446 }
 447
 448 static void
 449 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 450 {
 451         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 452         if (require_gcm_256) {
 453                 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
 454                 pneg_ctxt->CipherCount = cpu_to_le16(1);
 455                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
 456         } else if (enable_gcm_256) {
 457                 pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
 458                 pneg_ctxt->CipherCount = cpu_to_le16(3);
 459                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 460                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
 461                 pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
 462         } else {
 463                 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
 464                 pneg_ctxt->CipherCount = cpu_to_le16(2);
 465                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 466                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 467         }
 468 }
 469
 470 static unsigned int
 471 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 472 {
 473         struct nls_table *cp = load_nls_default();
 474
 475         pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 476
 477         /* copy up to max of first 100 bytes of server name to NetName field */
 478         pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 479         /* context size is DataLength + minimal smb2_neg_context */
 480         return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
 481                         sizeof(struct smb2_neg_context), 8) * 8;
 482 }
 483
 484 static void
 485 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 486 {
 487         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 488         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 489         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 490         pneg_ctxt->Name[0] = 0x93;
 491         pneg_ctxt->Name[1] = 0xAD;
 492         pneg_ctxt->Name[2] = 0x25;
 493         pneg_ctxt->Name[3] = 0x50;
 494         pneg_ctxt->Name[4] = 0x9C;
 495         pneg_ctxt->Name[5] = 0xB4;
 496         pneg_ctxt->Name[6] = 0x11;
 497         pneg_ctxt->Name[7] = 0xE7;
 498         pneg_ctxt->Name[8] = 0xB4;
 499         pneg_ctxt->Name[9] = 0x23;
 500         pneg_ctxt->Name[10] = 0x83;
 501         pneg_ctxt->Name[11] = 0xDE;
 502         pneg_ctxt->Name[12] = 0x96;
 503         pneg_ctxt->Name[13] = 0x8B;
 504         pneg_ctxt->Name[14] = 0xCD;
 505         pneg_ctxt->Name[15] = 0x7C;
 506 }
 507
 508 static void
 509 assemble_neg_contexts(struct smb2_negotiate_req *req,
 510                       struct TCP_Server_Info *server, unsigned int *total_len)
 511 {
 512         char *pneg_ctxt;
 513         unsigned int ctxt_len;
 514
 515         if (*total_len > 200) {
 516                 /* In case length corrupted don't want to overrun smb buffer */
 517                 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 518                 return;
 519         }
 520
 521         /*
 522          * round up total_len of fixed part of SMB3 negotiate request to 8
 523          * byte boundary before adding negotiate contexts
 524          */
 525         *total_len = roundup(*total_len, 8);
 526
 527         pneg_ctxt = (*total_len) + (char *)req;
 528         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 529
 530         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 531         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 532         *total_len += ctxt_len;
 533         pneg_ctxt += ctxt_len;
 534
 535         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 536         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 537         *total_len += ctxt_len;
 538         pneg_ctxt += ctxt_len;
 539
 540         if (server->compress_algorithm) {
 541                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 542                                 pneg_ctxt);
 543                 ctxt_len = DIV_ROUND_UP(
 544                         sizeof(struct smb2_compression_capabilities_context),
 545                                 8) * 8;
 546                 *total_len += ctxt_len;
 547                 pneg_ctxt += ctxt_len;
 548                 req->NegotiateContextCount = cpu_to_le16(5);
 549         } else
 550                 req->NegotiateContextCount = cpu_to_le16(4);
 551
 552         ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 553                                         server->hostname);
 554         *total_len += ctxt_len;
 555         pneg_ctxt += ctxt_len;
 556
 557         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 558         *total_len += sizeof(struct smb2_posix_neg_context);
 559 }
 560
 561 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 562 {
 563         unsigned int len = le16_to_cpu(ctxt->DataLength);
 564
 565         /* If invalid preauth context warn but use what we requested, SHA-512 */
 566         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 567                 pr_warn_once("server sent bad preauth context\n");
 568                 return;
 569         } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
 570                 pr_warn_once("server sent invalid SaltLength\n");
 571                 return;
 572         }
 573         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 574                 pr_warn_once("Invalid SMB3 hash algorithm count\n");
 575         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 576                 pr_warn_once("unknown SMB3 hash algorithm\n");
 577 }
 578
 579 static void decode_compress_ctx(struct TCP_Server_Info *server,
 580                          struct smb2_compression_capabilities_context *ctxt)
 581 {
 582         unsigned int len = le16_to_cpu(ctxt->DataLength);
 583
 584         /* sizeof compress context is a one element compression capbility struct */
 585         if (len < 10) {
 586                 pr_warn_once("server sent bad compression cntxt\n");
 587                 return;
 588         }
 589         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 590                 pr_warn_once("Invalid SMB3 compress algorithm count\n");
 591                 return;
 592         }
 593         if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 594                 pr_warn_once("unknown compression algorithm\n");
 595                 return;
 596         }
 597         server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 598 }
 599
 600 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 601                               struct smb2_encryption_neg_context *ctxt)
 602 {
 603         unsigned int len = le16_to_cpu(ctxt->DataLength);
 604
 605         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 606         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 607                 pr_warn_once("server sent bad crypto ctxt len\n");
 608                 return -EINVAL;
 609         }
 610
 611         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 612                 pr_warn_once("Invalid SMB3.11 cipher count\n");
 613                 return -EINVAL;
 614         }
 615         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 616         if (require_gcm_256) {
 617                 if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
 618                         cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
 619                         return -EOPNOTSUPP;
 620                 }
 621         } else if (ctxt->Ciphers[0] == 0) {
 622                 /*
 623                  * e.g. if server only supported AES256_CCM (very unlikely)
 624                  * or server supported no encryption types or had all disabled.
 625                  * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
 626                  * in which mount requested encryption ("seal") checks later
 627                  * on during tree connection will return proper rc, but if
 628                  * seal not requested by client, since server is allowed to
 629                  * return 0 to indicate no supported cipher, we can't fail here
 630                  */
 631                 server->cipher_type = 0;
 632                 server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
 633                 pr_warn_once("Server does not support requested encryption types\n");
 634                 return 0;
 635         } else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 636                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
 637                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
 638                 /* server returned a cipher we didn't ask for */
 639                 pr_warn_once("Invalid SMB3.11 cipher returned\n");
 640                 return -EINVAL;
 641         }
 642         server->cipher_type = ctxt->Ciphers[0];
 643         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 644         return 0;
 645 }
 646
 647 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 648                                      struct TCP_Server_Info *server,
 649                                      unsigned int len_of_smb)
 650 {
 651         struct smb2_neg_context *pctx;
 652         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 653         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 654         unsigned int len_of_ctxts, i;
 655         int rc = 0;
 656
 657         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 658         if (len_of_smb <= offset) {
 659                 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 660                 return -EINVAL;
 661         }
 662
 663         len_of_ctxts = len_of_smb - offset;
 664
 665         for (i = 0; i < ctxt_cnt; i++) {
 666                 int clen;
 667                 /* check that offset is not beyond end of SMB */
 668                 if (len_of_ctxts == 0)
 669                         break;
 670
 671                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 672                         break;
 673
 674                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 675                 clen = le16_to_cpu(pctx->DataLength);
 676                 if (clen > len_of_ctxts)
 677                         break;
 678
 679                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 680                         decode_preauth_context(
 681                                 (struct smb2_preauth_neg_context *)pctx);
 682                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 683                         rc = decode_encrypt_ctx(server,
 684                                 (struct smb2_encryption_neg_context *)pctx);
 685                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 686                         decode_compress_ctx(server,
 687                                 (struct smb2_compression_capabilities_context *)pctx);
 688                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 689                         server->posix_ext_supported = true;
 690                 else
 691                         cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 692                                 le16_to_cpu(pctx->ContextType));
 693
 694                 if (rc)
 695                         break;
 696                 /* offsets must be 8 byte aligned */
 697                 clen = (clen + 7) & ~0x7;
 698                 offset += clen + sizeof(struct smb2_neg_context);
 699                 len_of_ctxts -= clen;
 700         }
 701         return rc;
 702 }
 703
 704 static struct create_posix *
 705 create_posix_buf(umode_t mode)
 706 {
 707         struct create_posix *buf;
 708
 709         buf = kzalloc(sizeof(struct create_posix),
 710                         GFP_KERNEL);
 711         if (!buf)
 712                 return NULL;
 713
 714         buf->ccontext.DataOffset =
 715                 cpu_to_le16(offsetof(struct create_posix, Mode));
 716         buf->ccontext.DataLength = cpu_to_le32(4);
 717         buf->ccontext.NameOffset =
 718                 cpu_to_le16(offsetof(struct create_posix, Name));
 719         buf->ccontext.NameLength = cpu_to_le16(16);
 720
 721         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 722         buf->Name[0] = 0x93;
 723         buf->Name[1] = 0xAD;
 724         buf->Name[2] = 0x25;
 725         buf->Name[3] = 0x50;
 726         buf->Name[4] = 0x9C;
 727         buf->Name[5] = 0xB4;
 728         buf->Name[6] = 0x11;
 729         buf->Name[7] = 0xE7;
 730         buf->Name[8] = 0xB4;
 731         buf->Name[9] = 0x23;
 732         buf->Name[10] = 0x83;
 733         buf->Name[11] = 0xDE;
 734         buf->Name[12] = 0x96;
 735         buf->Name[13] = 0x8B;
 736         buf->Name[14] = 0xCD;
 737         buf->Name[15] = 0x7C;
 738         buf->Mode = cpu_to_le32(mode);
 739         cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
 740         return buf;
 741 }
 742
 743 static int
 744 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 745 {
 746         struct smb2_create_req *req = iov[0].iov_base;
 747         unsigned int num = *num_iovec;
 748
 749         iov[num].iov_base = create_posix_buf(mode);
 750         if (mode == ACL_NO_MODE)
 751                 cifs_dbg(FYI, "Invalid mode\n");
 752         if (iov[num].iov_base == NULL)
 753                 return -ENOMEM;
 754         iov[num].iov_len = sizeof(struct create_posix);
 755         if (!req->CreateContextsOffset)
 756                 req->CreateContextsOffset = cpu_to_le32(
 757                                 sizeof(struct smb2_create_req) +
 758                                 iov[num - 1].iov_len);
 759         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 760         *num_iovec = num + 1;
 761         return 0;
 762 }
 763
 764
 765 /*
 766  *
 767  *      SMB2 Worker functions follow:
 768  *
 769  *      The general structure of the worker functions is:
 770  *      1) Call smb2_init (assembles SMB2 header)
 771  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 772  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 773  *      4) Decode SMB2 command specific fields in the fixed length area
 774  *      5) Decode variable length data area (if any for this SMB2 command type)
 775  *      6) Call free smb buffer
 776  *      7) return
 777  *
 778  */
 779
 780 int
 781 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 782 {
 783         struct smb_rqst rqst;
 784         struct smb2_negotiate_req *req;
 785         struct smb2_negotiate_rsp *rsp;
 786         struct kvec iov[1];
 787         struct kvec rsp_iov;
 788         int rc = 0;
 789         int resp_buftype;
 790         struct TCP_Server_Info *server = cifs_ses_server(ses);
 791         int blob_offset, blob_length;
 792         char *security_blob;
 793         int flags = CIFS_NEG_OP;
 794         unsigned int total_len;
 795
 796         cifs_dbg(FYI, "Negotiate protocol\n");
 797
 798         if (!server) {
 799                 WARN(1, "%s: server is NULL!\n", __func__);
 800                 return -EIO;
 801         }
 802
 803         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
 804                                  (void **) &req, &total_len);
 805         if (rc)
 806                 return rc;
 807
 808         req->sync_hdr.SessionId = 0;
 809
 810         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 811         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 812
 813         if (strcmp(server->vals->version_string,
 814                    SMB3ANY_VERSION_STRING) == 0) {
 815                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 816                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 817                 req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
 818                 req->DialectCount = cpu_to_le16(3);
 819                 total_len += 6;
 820         } else if (strcmp(server->vals->version_string,
 821                    SMBDEFAULT_VERSION_STRING) == 0) {
 822                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 823                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 824                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 825                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 826                 req->DialectCount = cpu_to_le16(4);
 827                 total_len += 8;
 828         } else {
 829                 /* otherwise send specific dialect */
 830                 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
 831                 req->DialectCount = cpu_to_le16(1);
 832                 total_len += 2;
 833         }
 834
 835         /* only one of SMB2 signing flags may be set in SMB2 request */
 836         if (ses->sign)
 837                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 838         else if (global_secflags & CIFSSEC_MAY_SIGN)
 839                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 840         else
 841                 req->SecurityMode = 0;
 842
 843         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
 844
 845         /* ClientGUID must be zero for SMB2.02 dialect */
 846         if (server->vals->protocol_id == SMB20_PROT_ID)
 847                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 848         else {
 849                 memcpy(req->ClientGUID, server->client_guid,
 850                         SMB2_CLIENT_GUID_SIZE);
 851                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
 852                     (strcmp(server->vals->version_string,
 853                      SMB3ANY_VERSION_STRING) == 0) ||
 854                     (strcmp(server->vals->version_string,
 855                      SMBDEFAULT_VERSION_STRING) == 0))
 856                         assemble_neg_contexts(req, server, &total_len);
 857         }
 858         iov[0].iov_base = (char *)req;
 859         iov[0].iov_len = total_len;
 860
 861         memset(&rqst, 0, sizeof(struct smb_rqst));
 862         rqst.rq_iov = iov;
 863         rqst.rq_nvec = 1;
 864
 865         rc = cifs_send_recv(xid, ses, server,
 866                             &rqst, &resp_buftype, flags, &rsp_iov);
 867         cifs_small_buf_release(req);
 868         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 869         /*
 870          * No tcon so can't do
 871          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 872          */
 873         if (rc == -EOPNOTSUPP) {
 874                 cifs_server_dbg(VFS, "Dialect not supported by server. Consider  specifying vers=1.0 or vers=2.0 on mount for accessing older servers\n");
 875                 goto neg_exit;
 876         } else if (rc != 0)
 877                 goto neg_exit;
 878
 879         if (strcmp(server->vals->version_string,
 880                    SMB3ANY_VERSION_STRING) == 0) {
 881                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 882                         cifs_server_dbg(VFS,
 883                                 "SMB2 dialect returned but not requested\n");
 884                         return -EIO;
 885                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 886                         cifs_server_dbg(VFS,
 887                                 "SMB2.1 dialect returned but not requested\n");
 888                         return -EIO;
 889                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 890                         /* ops set to 3.0 by default for default so update */
 891                         server->ops = &smb311_operations;
 892                         server->vals = &smb311_values;
 893                 }
 894         } else if (strcmp(server->vals->version_string,
 895                    SMBDEFAULT_VERSION_STRING) == 0) {
 896                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 897                         cifs_server_dbg(VFS,
 898                                 "SMB2 dialect returned but not requested\n");
 899                         return -EIO;
 900                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 901                         /* ops set to 3.0 by default for default so update */
 902                         server->ops = &smb21_operations;
 903                         server->vals = &smb21_values;
 904                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 905                         server->ops = &smb311_operations;
 906                         server->vals = &smb311_values;
 907                 }
 908         } else if (le16_to_cpu(rsp->DialectRevision) !=
 909                                 server->vals->protocol_id) {
 910                 /* if requested single dialect ensure returned dialect matched */
 911                 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
 912                                 le16_to_cpu(rsp->DialectRevision));
 913                 return -EIO;
 914         }
 915
 916         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 917
 918         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 919                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 920         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 921                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 922         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 923                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 924         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 925                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 926         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 927                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 928         else {
 929                 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
 930                                 le16_to_cpu(rsp->DialectRevision));
 931                 rc = -EIO;
 932                 goto neg_exit;
 933         }
 934         server->dialect = le16_to_cpu(rsp->DialectRevision);
 935
 936         /*
 937          * Keep a copy of the hash after negprot. This hash will be
 938          * the starting hash value for all sessions made from this
 939          * server.
 940          */
 941         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 942                SMB2_PREAUTH_HASH_SIZE);
 943
 944         /* SMB2 only has an extended negflavor */
 945         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 946         /* set it to the maximum buffer size value we can send with 1 credit */
 947         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 948                                SMB2_MAX_BUFFER_SIZE);
 949         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 950         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 951         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 952         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 953                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 954                                 server->sec_mode);
 955         server->capabilities = le32_to_cpu(rsp->Capabilities);
 956         /* Internal types */
 957         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 958
 959         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 960                                                (struct smb2_sync_hdr *)rsp);
 961         /*
 962          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 963          * for us will be
 964          *      ses->sectype = RawNTLMSSP;
 965          * but for time being this is our only auth choice so doesn't matter.
 966          * We just found a server which sets blob length to zero expecting raw.
 967          */
 968         if (blob_length == 0) {
 969                 cifs_dbg(FYI, "missing security blob on negprot\n");
 970                 server->sec_ntlmssp = true;
 971         }
 972
 973         rc = cifs_enable_signing(server, ses->sign);
 974         if (rc)
 975                 goto neg_exit;
 976         if (blob_length) {
 977                 rc = decode_negTokenInit(security_blob, blob_length, server);
 978                 if (rc == 1)
 979                         rc = 0;
 980                 else if (rc == 0)
 981                         rc = -EIO;
 982         }
 983
 984         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 985                 if (rsp->NegotiateContextCount)
 986                         rc = smb311_decode_neg_context(rsp, server,
 987                                                        rsp_iov.iov_len);
 988                 else
 989                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
 990         }
 991 neg_exit:
 992         free_rsp_buf(resp_buftype, rsp);
 993         return rc;
 994 }
 995
 996 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 997 {
 998         int rc;
 999         struct validate_negotiate_info_req *pneg_inbuf;
1000         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1001         u32 rsplen;
1002         u32 inbuflen; /* max of 4 dialects */
1003         struct TCP_Server_Info *server = tcon->ses->server;
1004
1005         cifs_dbg(FYI, "validate negotiate\n");
1006
1007         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1008         if (server->dialect == SMB311_PROT_ID)
1009                 return 0;
1010
1011         /*
1012          * validation ioctl must be signed, so no point sending this if we
1013          * can not sign it (ie are not known user).  Even if signing is not
1014          * required (enabled but not negotiated), in those cases we selectively
1015          * sign just this, the first and only signed request on a connection.
1016          * Having validation of negotiate info  helps reduce attack vectors.
1017          */
1018         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1019                 return 0; /* validation requires signing */
1020
1021         if (tcon->ses->user_name == NULL) {
1022                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1023                 return 0; /* validation requires signing */
1024         }
1025
1026         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1027                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1028
1029         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1030         if (!pneg_inbuf)
1031                 return -ENOMEM;
1032
1033         pneg_inbuf->Capabilities =
1034                         cpu_to_le32(server->vals->req_capabilities);
1035         memcpy(pneg_inbuf->Guid, server->client_guid,
1036                                         SMB2_CLIENT_GUID_SIZE);
1037
1038         if (tcon->ses->sign)
1039                 pneg_inbuf->SecurityMode =
1040                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1041         else if (global_secflags & CIFSSEC_MAY_SIGN)
1042                 pneg_inbuf->SecurityMode =
1043                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1044         else
1045                 pneg_inbuf->SecurityMode = 0;
1046
1047
1048         if (strcmp(server->vals->version_string,
1049                 SMB3ANY_VERSION_STRING) == 0) {
1050                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1051                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1052                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1053                 pneg_inbuf->DialectCount = cpu_to_le16(3);
1054                 /* SMB 2.1 not included so subtract one dialect from len */
1055                 inbuflen = sizeof(*pneg_inbuf) -
1056                                 (sizeof(pneg_inbuf->Dialects[0]));
1057         } else if (strcmp(server->vals->version_string,
1058                 SMBDEFAULT_VERSION_STRING) == 0) {
1059                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1060                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1061                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1062                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1063                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1064                 /* structure is big enough for 4 dialects */
1065                 inbuflen = sizeof(*pneg_inbuf);
1066         } else {
1067                 /* otherwise specific dialect was requested */
1068                 pneg_inbuf->Dialects[0] =
1069                         cpu_to_le16(server->vals->protocol_id);
1070                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1071                 /* structure is big enough for 3 dialects, sending only 1 */
1072                 inbuflen = sizeof(*pneg_inbuf) -
1073                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
1074         }
1075
1076         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1077                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1078                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1079                 (char **)&pneg_rsp, &rsplen);
1080         if (rc == -EOPNOTSUPP) {
1081                 /*
1082                  * Old Windows versions or Netapp SMB server can return
1083                  * not supported error. Client should accept it.
1084                  */
1085                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1086                 rc = 0;
1087                 goto out_free_inbuf;
1088         } else if (rc != 0) {
1089                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1090                               rc);
1091                 rc = -EIO;
1092                 goto out_free_inbuf;
1093         }
1094
1095         rc = -EIO;
1096         if (rsplen != sizeof(*pneg_rsp)) {
1097                 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1098                               rsplen);
1099
1100                 /* relax check since Mac returns max bufsize allowed on ioctl */
1101                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1102                         goto out_free_rsp;
1103         }
1104
1105         /* check validate negotiate info response matches what we got earlier */
1106         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1107                 goto vneg_out;
1108
1109         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1110                 goto vneg_out;
1111
1112         /* do not validate server guid because not saved at negprot time yet */
1113
1114         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1115               SMB2_LARGE_FILES) != server->capabilities)
1116                 goto vneg_out;
1117
1118         /* validate negotiate successful */
1119         rc = 0;
1120         cifs_dbg(FYI, "validate negotiate info successful\n");
1121         goto out_free_rsp;
1122
1123 vneg_out:
1124         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1125 out_free_rsp:
1126         kfree(pneg_rsp);
1127 out_free_inbuf:
1128         kfree(pneg_inbuf);
1129         return rc;
1130 }
1131
1132 enum securityEnum
1133 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1134 {
1135         switch (requested) {
1136         case Kerberos:
1137         case RawNTLMSSP:
1138                 return requested;
1139         case NTLMv2:
1140                 return RawNTLMSSP;
1141         case Unspecified:
1142                 if (server->sec_ntlmssp &&
1143                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1144                         return RawNTLMSSP;
1145                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1146                         (global_secflags & CIFSSEC_MAY_KRB5))
1147                         return Kerberos;
1148                 fallthrough;
1149         default:
1150                 return Unspecified;
1151         }
1152 }
1153
1154 struct SMB2_sess_data {
1155         unsigned int xid;
1156         struct cifs_ses *ses;
1157         struct nls_table *nls_cp;
1158         void (*func)(struct SMB2_sess_data *);
1159         int result;
1160         u64 previous_session;
1161
1162         /* we will send the SMB in three pieces:
1163          * a fixed length beginning part, an optional
1164          * SPNEGO blob (which can be zero length), and a
1165          * last part which will include the strings
1166          * and rest of bcc area. This allows us to avoid
1167          * a large buffer 17K allocation
1168          */
1169         int buf0_type;
1170         struct kvec iov[2];
1171 };
1172
1173 static int
1174 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1175 {
1176         int rc;
1177         struct cifs_ses *ses = sess_data->ses;
1178         struct smb2_sess_setup_req *req;
1179         struct TCP_Server_Info *server = cifs_ses_server(ses);
1180         unsigned int total_len;
1181
1182         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1183                                  (void **) &req,
1184                                  &total_len);
1185         if (rc)
1186                 return rc;
1187
1188         if (sess_data->ses->binding) {
1189                 req->sync_hdr.SessionId = sess_data->ses->Suid;
1190                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1191                 req->PreviousSessionId = 0;
1192                 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1193         } else {
1194                 /* First session, not a reauthenticate */
1195                 req->sync_hdr.SessionId = 0;
1196                 /*
1197                  * if reconnect, we need to send previous sess id
1198                  * otherwise it is 0
1199                  */
1200                 req->PreviousSessionId = sess_data->previous_session;
1201                 req->Flags = 0; /* MBZ */
1202         }
1203
1204         /* enough to enable echos and oplocks and one max size write */
1205         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1206
1207         /* only one of SMB2 signing flags may be set in SMB2 request */
1208         if (server->sign)
1209                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1210         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1211                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1212         else
1213                 req->SecurityMode = 0;
1214
1215 #ifdef CONFIG_CIFS_DFS_UPCALL
1216         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1217 #else
1218         req->Capabilities = 0;
1219 #endif /* DFS_UPCALL */
1220
1221         req->Channel = 0; /* MBZ */
1222
1223         sess_data->iov[0].iov_base = (char *)req;
1224         /* 1 for pad */
1225         sess_data->iov[0].iov_len = total_len - 1;
1226         /*
1227          * This variable will be used to clear the buffer
1228          * allocated above in case of any error in the calling function.
1229          */
1230         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1231
1232         return 0;
1233 }
1234
1235 static void
1236 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1237 {
1238         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1239         sess_data->buf0_type = CIFS_NO_BUFFER;
1240 }
1241
1242 static int
1243 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1244 {
1245         int rc;
1246         struct smb_rqst rqst;
1247         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1248         struct kvec rsp_iov = { NULL, 0 };
1249
1250         /* Testing shows that buffer offset must be at location of Buffer[0] */
1251         req->SecurityBufferOffset =
1252                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1253         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1254
1255         memset(&rqst, 0, sizeof(struct smb_rqst));
1256         rqst.rq_iov = sess_data->iov;
1257         rqst.rq_nvec = 2;
1258
1259         /* BB add code to build os and lm fields */
1260         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1261                             cifs_ses_server(sess_data->ses),
1262                             &rqst,
1263                             &sess_data->buf0_type,
1264                             CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);
1265         cifs_small_buf_release(sess_data->iov[0].iov_base);
1266         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1267
1268         return rc;
1269 }
1270
1271 static int
1272 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1273 {
1274         int rc = 0;
1275         struct cifs_ses *ses = sess_data->ses;
1276         struct TCP_Server_Info *server = cifs_ses_server(ses);
1277
1278         mutex_lock(&server->srv_mutex);
1279         if (server->ops->generate_signingkey) {
1280                 rc = server->ops->generate_signingkey(ses);
1281                 if (rc) {
1282                         cifs_dbg(FYI,
1283                                 "SMB3 session key generation failed\n");
1284                         mutex_unlock(&server->srv_mutex);
1285                         return rc;
1286                 }
1287         }
1288         if (!server->session_estab) {
1289                 server->sequence_number = 0x2;
1290                 server->session_estab = true;
1291         }
1292         mutex_unlock(&server->srv_mutex);
1293
1294         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1295         /* keep existing ses state if binding */
1296         if (!ses->binding) {
1297                 spin_lock(&GlobalMid_Lock);
1298                 ses->status = CifsGood;
1299                 ses->need_reconnect = false;
1300                 spin_unlock(&GlobalMid_Lock);
1301         }
1302
1303         return rc;
1304 }
1305
1306 #ifdef CONFIG_CIFS_UPCALL
1307 static void
1308 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1309 {
1310         int rc;
1311         struct cifs_ses *ses = sess_data->ses;
1312         struct cifs_spnego_msg *msg;
1313         struct key *spnego_key = NULL;
1314         struct smb2_sess_setup_rsp *rsp = NULL;
1315
1316         rc = SMB2_sess_alloc_buffer(sess_data);
1317         if (rc)
1318                 goto out;
1319
1320         spnego_key = cifs_get_spnego_key(ses);
1321         if (IS_ERR(spnego_key)) {
1322                 rc = PTR_ERR(spnego_key);
1323                 if (rc == -ENOKEY)
1324                         cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1325                 spnego_key = NULL;
1326                 goto out;
1327         }
1328
1329         msg = spnego_key->payload.data[0];
1330         /*
1331          * check version field to make sure that cifs.upcall is
1332          * sending us a response in an expected form
1333          */
1334         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1335                 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1336                          CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1337                 rc = -EKEYREJECTED;
1338                 goto out_put_spnego_key;
1339         }
1340
1341         /* keep session key if binding */
1342         if (!ses->binding) {
1343                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1344                                                  GFP_KERNEL);
1345                 if (!ses->auth_key.response) {
1346                         cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1347                                  msg->sesskey_len);
1348                         rc = -ENOMEM;
1349                         goto out_put_spnego_key;
1350                 }
1351                 ses->auth_key.len = msg->sesskey_len;
1352         }
1353
1354         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1355         sess_data->iov[1].iov_len = msg->secblob_len;
1356
1357         rc = SMB2_sess_sendreceive(sess_data);
1358         if (rc)
1359                 goto out_put_spnego_key;
1360
1361         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1362         /* keep session id and flags if binding */
1363         if (!ses->binding) {
1364                 ses->Suid = rsp->sync_hdr.SessionId;
1365                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1366         }
1367
1368         rc = SMB2_sess_establish_session(sess_data);
1369 out_put_spnego_key:
1370         key_invalidate(spnego_key);
1371         key_put(spnego_key);
1372 out:
1373         sess_data->result = rc;
1374         sess_data->func = NULL;
1375         SMB2_sess_free_buffer(sess_data);
1376 }
1377 #else
1378 static void
1379 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1380 {
1381         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1382         sess_data->result = -EOPNOTSUPP;
1383         sess_data->func = NULL;
1384 }
1385 #endif
1386
1387 static void
1388 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1389
1390 static void
1391 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1392 {
1393         int rc;
1394         struct cifs_ses *ses = sess_data->ses;
1395         struct smb2_sess_setup_rsp *rsp = NULL;
1396         char *ntlmssp_blob = NULL;
1397         bool use_spnego = false; /* else use raw ntlmssp */
1398         u16 blob_length = 0;
1399
1400         /*
1401          * If memory allocation is successful, caller of this function
1402          * frees it.
1403          */
1404         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1405         if (!ses->ntlmssp) {
1406                 rc = -ENOMEM;
1407                 goto out_err;
1408         }
1409         ses->ntlmssp->sesskey_per_smbsess = true;
1410
1411         rc = SMB2_sess_alloc_buffer(sess_data);
1412         if (rc)
1413                 goto out_err;
1414
1415         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1416                                GFP_KERNEL);
1417         if (ntlmssp_blob == NULL) {
1418                 rc = -ENOMEM;
1419                 goto out;
1420         }
1421
1422         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1423         if (use_spnego) {
1424                 /* BB eventually need to add this */
1425                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1426                 rc = -EOPNOTSUPP;
1427                 goto out;
1428         } else {
1429                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1430                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1431         }
1432         sess_data->iov[1].iov_base = ntlmssp_blob;
1433         sess_data->iov[1].iov_len = blob_length;
1434
1435         rc = SMB2_sess_sendreceive(sess_data);
1436         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1437
1438         /* If true, rc here is expected and not an error */
1439         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1440                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1441                 rc = 0;
1442
1443         if (rc)
1444                 goto out;
1445
1446         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1447                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1448                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1449                         le16_to_cpu(rsp->SecurityBufferOffset));
1450                 rc = -EIO;
1451                 goto out;
1452         }
1453         rc = decode_ntlmssp_challenge(rsp->Buffer,
1454                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1455         if (rc)
1456                 goto out;
1457
1458         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1459
1460         /* keep existing ses id and flags if binding */
1461         if (!ses->binding) {
1462                 ses->Suid = rsp->sync_hdr.SessionId;
1463                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1464         }
1465
1466 out:
1467         kfree(ntlmssp_blob);
1468         SMB2_sess_free_buffer(sess_data);
1469         if (!rc) {
1470                 sess_data->result = 0;
1471                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1472                 return;
1473         }
1474 out_err:
1475         kfree(ses->ntlmssp);
1476         ses->ntlmssp = NULL;
1477         sess_data->result = rc;
1478         sess_data->func = NULL;
1479 }
1480
1481 static void
1482 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1483 {
1484         int rc;
1485         struct cifs_ses *ses = sess_data->ses;
1486         struct smb2_sess_setup_req *req;
1487         struct smb2_sess_setup_rsp *rsp = NULL;
1488         unsigned char *ntlmssp_blob = NULL;
1489         bool use_spnego = false; /* else use raw ntlmssp */
1490         u16 blob_length = 0;
1491
1492         rc = SMB2_sess_alloc_buffer(sess_data);
1493         if (rc)
1494                 goto out;
1495
1496         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1497         req->sync_hdr.SessionId = ses->Suid;
1498
1499         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1500                                         sess_data->nls_cp);
1501         if (rc) {
1502                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1503                 goto out;
1504         }
1505
1506         if (use_spnego) {
1507                 /* BB eventually need to add this */
1508                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1509                 rc = -EOPNOTSUPP;
1510                 goto out;
1511         }
1512         sess_data->iov[1].iov_base = ntlmssp_blob;
1513         sess_data->iov[1].iov_len = blob_length;
1514
1515         rc = SMB2_sess_sendreceive(sess_data);
1516         if (rc)
1517                 goto out;
1518
1519         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1520
1521         /* keep existing ses id and flags if binding */
1522         if (!ses->binding) {
1523                 ses->Suid = rsp->sync_hdr.SessionId;
1524                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1525         }
1526
1527         rc = SMB2_sess_establish_session(sess_data);
1528 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1529         if (ses->server->dialect < SMB30_PROT_ID) {
1530                 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1531                 /*
1532                  * The session id is opaque in terms of endianness, so we can't
1533                  * print it as a long long. we dump it as we got it on the wire
1534                  */
1535                 cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1536                          &ses->Suid);
1537                 cifs_dbg(VFS, "Session Key   %*ph\n",
1538                          SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1539                 cifs_dbg(VFS, "Signing Key   %*ph\n",
1540                          SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1541         }
1542 #endif
1543 out:
1544         kfree(ntlmssp_blob);
1545         SMB2_sess_free_buffer(sess_data);
1546         kfree(ses->ntlmssp);
1547         ses->ntlmssp = NULL;
1548         sess_data->result = rc;
1549         sess_data->func = NULL;
1550 }
1551
1552 static int
1553 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1554 {
1555         int type;
1556
1557         type = smb2_select_sectype(cifs_ses_server(ses), ses->sectype);
1558         cifs_dbg(FYI, "sess setup type %d\n", type);
1559         if (type == Unspecified) {
1560                 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1561                 return -EINVAL;
1562         }
1563
1564         switch (type) {
1565         case Kerberos:
1566                 sess_data->func = SMB2_auth_kerberos;
1567                 break;
1568         case RawNTLMSSP:
1569                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1570                 break;
1571         default:
1572                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1573                 return -EOPNOTSUPP;
1574         }
1575
1576         return 0;
1577 }
1578
1579 int
1580 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1581                 const struct nls_table *nls_cp)
1582 {
1583         int rc = 0;
1584         struct TCP_Server_Info *server = cifs_ses_server(ses);
1585         struct SMB2_sess_data *sess_data;
1586
1587         cifs_dbg(FYI, "Session Setup\n");
1588
1589         if (!server) {
1590                 WARN(1, "%s: server is NULL!\n", __func__);
1591                 return -EIO;
1592         }
1593
1594         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1595         if (!sess_data)
1596                 return -ENOMEM;
1597
1598         rc = SMB2_select_sec(ses, sess_data);
1599         if (rc)
1600                 goto out;
1601         sess_data->xid = xid;
1602         sess_data->ses = ses;
1603         sess_data->buf0_type = CIFS_NO_BUFFER;
1604         sess_data->nls_cp = (struct nls_table *) nls_cp;
1605         sess_data->previous_session = ses->Suid;
1606
1607         /*
1608          * Initialize the session hash with the server one.
1609          */
1610         memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1611                SMB2_PREAUTH_HASH_SIZE);
1612
1613         while (sess_data->func)
1614                 sess_data->func(sess_data);
1615
1616         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1617                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1618         rc = sess_data->result;
1619 out:
1620         kfree(sess_data);
1621         return rc;
1622 }
1623
1624 int
1625 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1626 {
1627         struct smb_rqst rqst;
1628         struct smb2_logoff_req *req; /* response is also trivial struct */
1629         int rc = 0;
1630         struct TCP_Server_Info *server;
1631         int flags = 0;
1632         unsigned int total_len;
1633         struct kvec iov[1];
1634         struct kvec rsp_iov;
1635         int resp_buf_type;
1636
1637         cifs_dbg(FYI, "disconnect session %p\n", ses);
1638
1639         if (ses && (ses->server))
1640                 server = ses->server;
1641         else
1642                 return -EIO;
1643
1644         /* no need to send SMB logoff if uid already closed due to reconnect */
1645         if (ses->need_reconnect)
1646                 goto smb2_session_already_dead;
1647
1648         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1649                                  (void **) &req, &total_len);
1650         if (rc)
1651                 return rc;
1652
1653          /* since no tcon, smb2_init can not do this, so do here */
1654         req->sync_hdr.SessionId = ses->Suid;
1655
1656         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1657                 flags |= CIFS_TRANSFORM_REQ;
1658         else if (server->sign)
1659                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1660
1661         flags |= CIFS_NO_RSP_BUF;
1662
1663         iov[0].iov_base = (char *)req;
1664         iov[0].iov_len = total_len;
1665
1666         memset(&rqst, 0, sizeof(struct smb_rqst));
1667         rqst.rq_iov = iov;
1668         rqst.rq_nvec = 1;
1669
1670         rc = cifs_send_recv(xid, ses, ses->server,
1671                             &rqst, &resp_buf_type, flags, &rsp_iov);
1672         cifs_small_buf_release(req);
1673         /*
1674          * No tcon so can't do
1675          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1676          */
1677
1678 smb2_session_already_dead:
1679         return rc;
1680 }
1681
1682 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1683 {
1684         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1685 }
1686
1687 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1688
1689 /* These are similar values to what Windows uses */
1690 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1691 {
1692         tcon->max_chunks = 256;
1693         tcon->max_bytes_chunk = 1048576;
1694         tcon->max_bytes_copy = 16777216;
1695 }
1696
1697 int
1698 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1699           struct cifs_tcon *tcon, const struct nls_table *cp)
1700 {
1701         struct smb_rqst rqst;
1702         struct smb2_tree_connect_req *req;
1703         struct smb2_tree_connect_rsp *rsp = NULL;
1704         struct kvec iov[2];
1705         struct kvec rsp_iov = { NULL, 0 };
1706         int rc = 0;
1707         int resp_buftype;
1708         int unc_path_len;
1709         __le16 *unc_path = NULL;
1710         int flags = 0;
1711         unsigned int total_len;
1712         struct TCP_Server_Info *server;
1713
1714         /* always use master channel */
1715         server = ses->server;
1716
1717         cifs_dbg(FYI, "TCON\n");
1718
1719         if (!server || !tree)
1720                 return -EIO;
1721
1722         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1723         if (unc_path == NULL)
1724                 return -ENOMEM;
1725
1726         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1727         unc_path_len *= 2;
1728         if (unc_path_len < 2) {
1729                 kfree(unc_path);
1730                 return -EINVAL;
1731         }
1732
1733         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1734         tcon->tid = 0;
1735         atomic_set(&tcon->num_remote_opens, 0);
1736         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
1737                                  (void **) &req, &total_len);
1738         if (rc) {
1739                 kfree(unc_path);
1740                 return rc;
1741         }
1742
1743         if (smb3_encryption_required(tcon))
1744                 flags |= CIFS_TRANSFORM_REQ;
1745
1746         iov[0].iov_base = (char *)req;
1747         /* 1 for pad */
1748         iov[0].iov_len = total_len - 1;
1749
1750         /* Testing shows that buffer offset must be at location of Buffer[0] */
1751         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1752                         - 1 /* pad */);
1753         req->PathLength = cpu_to_le16(unc_path_len - 2);
1754         iov[1].iov_base = unc_path;
1755         iov[1].iov_len = unc_path_len;
1756
1757         /*
1758          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1759          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1760          * (Samba servers don't always set the flag so also check if null user)
1761          */
1762         if ((server->dialect == SMB311_PROT_ID) &&
1763             !smb3_encryption_required(tcon) &&
1764             !(ses->session_flags &
1765                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1766             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1767                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1768
1769         memset(&rqst, 0, sizeof(struct smb_rqst));
1770         rqst.rq_iov = iov;
1771         rqst.rq_nvec = 2;
1772
1773         /* Need 64 for max size write so ask for more in case not there yet */
1774         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1775
1776         rc = cifs_send_recv(xid, ses, server,
1777                             &rqst, &resp_buftype, flags, &rsp_iov);
1778         cifs_small_buf_release(req);
1779         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1780         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1781         if (rc != 0) {
1782                 if (tcon) {
1783                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1784                         tcon->need_reconnect = true;
1785                 }
1786                 goto tcon_error_exit;
1787         }
1788
1789         switch (rsp->ShareType) {
1790         case SMB2_SHARE_TYPE_DISK:
1791                 cifs_dbg(FYI, "connection to disk share\n");
1792                 break;
1793         case SMB2_SHARE_TYPE_PIPE:
1794                 tcon->pipe = true;
1795                 cifs_dbg(FYI, "connection to pipe share\n");
1796                 break;
1797         case SMB2_SHARE_TYPE_PRINT:
1798                 tcon->print = true;
1799                 cifs_dbg(FYI, "connection to printer\n");
1800                 break;
1801         default:
1802                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1803                 rc = -EOPNOTSUPP;
1804                 goto tcon_error_exit;
1805         }
1806
1807         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1808         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1809         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1810         tcon->tidStatus = CifsGood;
1811         tcon->need_reconnect = false;
1812         tcon->tid = rsp->sync_hdr.TreeId;
1813         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1814
1815         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1816             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1817                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1818
1819         if (tcon->seal &&
1820             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1821                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1822
1823         init_copy_chunk_defaults(tcon);
1824         if (server->ops->validate_negotiate)
1825                 rc = server->ops->validate_negotiate(xid, tcon);
1826 tcon_exit:
1827
1828         free_rsp_buf(resp_buftype, rsp);
1829         kfree(unc_path);
1830         return rc;
1831
1832 tcon_error_exit:
1833         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1834                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1835         }
1836         goto tcon_exit;
1837 }
1838
1839 int
1840 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1841 {
1842         struct smb_rqst rqst;
1843         struct smb2_tree_disconnect_req *req; /* response is trivial */
1844         int rc = 0;
1845         struct cifs_ses *ses = tcon->ses;
1846         int flags = 0;
1847         unsigned int total_len;
1848         struct kvec iov[1];
1849         struct kvec rsp_iov;
1850         int resp_buf_type;
1851
1852         cifs_dbg(FYI, "Tree Disconnect\n");
1853
1854         if (!ses || !(ses->server))
1855                 return -EIO;
1856
1857         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1858                 return 0;
1859
1860         close_cached_dir_lease(&tcon->crfid);
1861
1862         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
1863                                  (void **) &req,
1864                                  &total_len);
1865         if (rc)
1866                 return rc;
1867
1868         if (smb3_encryption_required(tcon))
1869                 flags |= CIFS_TRANSFORM_REQ;
1870
1871         flags |= CIFS_NO_RSP_BUF;
1872
1873         iov[0].iov_base = (char *)req;
1874         iov[0].iov_len = total_len;
1875
1876         memset(&rqst, 0, sizeof(struct smb_rqst));
1877         rqst.rq_iov = iov;
1878         rqst.rq_nvec = 1;
1879
1880         rc = cifs_send_recv(xid, ses, ses->server,
1881                             &rqst, &resp_buf_type, flags, &rsp_iov);
1882         cifs_small_buf_release(req);
1883         if (rc)
1884                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1885
1886         return rc;
1887 }
1888
1889
1890 static struct create_durable *
1891 create_durable_buf(void)
1892 {
1893         struct create_durable *buf;
1894
1895         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1896         if (!buf)
1897                 return NULL;
1898
1899         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1900                                         (struct create_durable, Data));
1901         buf->ccontext.DataLength = cpu_to_le32(16);
1902         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1903                                 (struct create_durable, Name));
1904         buf->ccontext.NameLength = cpu_to_le16(4);
1905         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1906         buf->Name[0] = 'D';
1907         buf->Name[1] = 'H';
1908         buf->Name[2] = 'n';
1909         buf->Name[3] = 'Q';
1910         return buf;
1911 }
1912
1913 static struct create_durable *
1914 create_reconnect_durable_buf(struct cifs_fid *fid)
1915 {
1916         struct create_durable *buf;
1917
1918         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1919         if (!buf)
1920                 return NULL;
1921
1922         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1923                                         (struct create_durable, Data));
1924         buf->ccontext.DataLength = cpu_to_le32(16);
1925         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1926                                 (struct create_durable, Name));
1927         buf->ccontext.NameLength = cpu_to_le16(4);
1928         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1929         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1930         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1931         buf->Name[0] = 'D';
1932         buf->Name[1] = 'H';
1933         buf->Name[2] = 'n';
1934         buf->Name[3] = 'C';
1935         return buf;
1936 }
1937
1938 static void
1939 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
1940 {
1941         struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
1942
1943         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
1944                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
1945         buf->IndexNumber = pdisk_id->DiskFileId;
1946 }
1947
1948 static void
1949 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
1950                  struct create_posix_rsp *posix)
1951 {
1952         int sid_len;
1953         u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
1954         u8 *end = beg + le32_to_cpu(cc->DataLength);
1955         u8 *sid;
1956
1957         memset(posix, 0, sizeof(*posix));
1958
1959         posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
1960         posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
1961         posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
1962
1963         sid = beg + 12;
1964         sid_len = posix_info_sid_size(sid, end);
1965         if (sid_len < 0) {
1966                 cifs_dbg(VFS, "bad owner sid in posix create response\n");
1967                 return;
1968         }
1969         memcpy(&posix->owner, sid, sid_len);
1970
1971         sid = sid + sid_len;
1972         sid_len = posix_info_sid_size(sid, end);
1973         if (sid_len < 0) {
1974                 cifs_dbg(VFS, "bad group sid in posix create response\n");
1975                 return;
1976         }
1977         memcpy(&posix->group, sid, sid_len);
1978
1979         cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
1980                  posix->nlink, posix->mode, posix->reparse_tag);
1981 }
1982
1983 void
1984 smb2_parse_contexts(struct TCP_Server_Info *server,
1985                     struct smb2_create_rsp *rsp,
1986                     unsigned int *epoch, char *lease_key, __u8 *oplock,
1987                     struct smb2_file_all_info *buf,
1988                     struct create_posix_rsp *posix)
1989 {
1990         char *data_offset;
1991         struct create_context *cc;
1992         unsigned int next;
1993         unsigned int remaining;
1994         char *name;
1995         static const char smb3_create_tag_posix[] = {
1996                 0x93, 0xAD, 0x25, 0x50, 0x9C,
1997                 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
1998                 0xDE, 0x96, 0x8B, 0xCD, 0x7C
1999         };
2000
2001         *oplock = 0;
2002         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
2003         remaining = le32_to_cpu(rsp->CreateContextsLength);
2004         cc = (struct create_context *)data_offset;
2005
2006         /* Initialize inode number to 0 in case no valid data in qfid context */
2007         if (buf)
2008                 buf->IndexNumber = 0;
2009
2010         while (remaining >= sizeof(struct create_context)) {
2011                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
2012                 if (le16_to_cpu(cc->NameLength) == 4 &&
2013                     strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
2014                         *oplock = server->ops->parse_lease_buf(cc, epoch,
2015                                                            lease_key);
2016                 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
2017                     strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
2018                         parse_query_id_ctxt(cc, buf);
2019                 else if ((le16_to_cpu(cc->NameLength) == 16)) {
2020                         if (posix &&
2021                             memcmp(name, smb3_create_tag_posix, 16) == 0)
2022                                 parse_posix_ctxt(cc, buf, posix);
2023                 }
2024                 /* else {
2025                         cifs_dbg(FYI, "Context not matched with len %d\n",
2026                                 le16_to_cpu(cc->NameLength));
2027                         cifs_dump_mem("Cctxt name: ", name, 4);
2028                 } */
2029
2030                 next = le32_to_cpu(cc->Next);
2031                 if (!next)
2032                         break;
2033                 remaining -= next;
2034                 cc = (struct create_context *)((char *)cc + next);
2035         }
2036
2037         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2038                 *oplock = rsp->OplockLevel;
2039
2040         return;
2041 }
2042
2043 static int
2044 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
2045                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2046 {
2047         struct smb2_create_req *req = iov[0].iov_base;
2048         unsigned int num = *num_iovec;
2049
2050         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2051         if (iov[num].iov_base == NULL)
2052                 return -ENOMEM;
2053         iov[num].iov_len = server->vals->create_lease_size;
2054         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2055         if (!req->CreateContextsOffset)
2056                 req->CreateContextsOffset = cpu_to_le32(
2057                                 sizeof(struct smb2_create_req) +
2058                                 iov[num - 1].iov_len);
2059         le32_add_cpu(&req->CreateContextsLength,
2060                      server->vals->create_lease_size);
2061         *num_iovec = num + 1;
2062         return 0;
2063 }
2064
2065 static struct create_durable_v2 *
2066 create_durable_v2_buf(struct cifs_open_parms *oparms)
2067 {
2068         struct cifs_fid *pfid = oparms->fid;
2069         struct create_durable_v2 *buf;
2070
2071         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2072         if (!buf)
2073                 return NULL;
2074
2075         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2076                                         (struct create_durable_v2, dcontext));
2077         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2078         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2079                                 (struct create_durable_v2, Name));
2080         buf->ccontext.NameLength = cpu_to_le16(4);
2081
2082         /*
2083          * NB: Handle timeout defaults to 0, which allows server to choose
2084          * (most servers default to 120 seconds) and most clients default to 0.
2085          * This can be overridden at mount ("handletimeout=") if the user wants
2086          * a different persistent (or resilient) handle timeout for all opens
2087          * opens on a particular SMB3 mount.
2088          */
2089         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2090         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2091         generate_random_uuid(buf->dcontext.CreateGuid);
2092         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2093
2094         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2095         buf->Name[0] = 'D';
2096         buf->Name[1] = 'H';
2097         buf->Name[2] = '2';
2098         buf->Name[3] = 'Q';
2099         return buf;
2100 }
2101
2102 static struct create_durable_handle_reconnect_v2 *
2103 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2104 {
2105         struct create_durable_handle_reconnect_v2 *buf;
2106
2107         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2108                         GFP_KERNEL);
2109         if (!buf)
2110                 return NULL;
2111
2112         buf->ccontext.DataOffset =
2113                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2114                                      dcontext));
2115         buf->ccontext.DataLength =
2116                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2117         buf->ccontext.NameOffset =
2118                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2119                             Name));
2120         buf->ccontext.NameLength = cpu_to_le16(4);
2121
2122         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2123         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2124         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2125         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2126
2127         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2128         buf->Name[0] = 'D';
2129         buf->Name[1] = 'H';
2130         buf->Name[2] = '2';
2131         buf->Name[3] = 'C';
2132         return buf;
2133 }
2134
2135 static int
2136 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2137                     struct cifs_open_parms *oparms)
2138 {
2139         struct smb2_create_req *req = iov[0].iov_base;
2140         unsigned int num = *num_iovec;
2141
2142         iov[num].iov_base = create_durable_v2_buf(oparms);
2143         if (iov[num].iov_base == NULL)
2144                 return -ENOMEM;
2145         iov[num].iov_len = sizeof(struct create_durable_v2);
2146         if (!req->CreateContextsOffset)
2147                 req->CreateContextsOffset =
2148                         cpu_to_le32(sizeof(struct smb2_create_req) +
2149                                                                 iov[1].iov_len);
2150         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2151         *num_iovec = num + 1;
2152         return 0;
2153 }
2154
2155 static int
2156 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2157                     struct cifs_open_parms *oparms)
2158 {
2159         struct smb2_create_req *req = iov[0].iov_base;
2160         unsigned int num = *num_iovec;
2161
2162         /* indicate that we don't need to relock the file */
2163         oparms->reconnect = false;
2164
2165         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2166         if (iov[num].iov_base == NULL)
2167                 return -ENOMEM;
2168         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2169         if (!req->CreateContextsOffset)
2170                 req->CreateContextsOffset =
2171                         cpu_to_le32(sizeof(struct smb2_create_req) +
2172                                                                 iov[1].iov_len);
2173         le32_add_cpu(&req->CreateContextsLength,
2174                         sizeof(struct create_durable_handle_reconnect_v2));
2175         *num_iovec = num + 1;
2176         return 0;
2177 }
2178
2179 static int
2180 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2181                     struct cifs_open_parms *oparms, bool use_persistent)
2182 {
2183         struct smb2_create_req *req = iov[0].iov_base;
2184         unsigned int num = *num_iovec;
2185
2186         if (use_persistent) {
2187                 if (oparms->reconnect)
2188                         return add_durable_reconnect_v2_context(iov, num_iovec,
2189                                                                 oparms);
2190                 else
2191                         return add_durable_v2_context(iov, num_iovec, oparms);
2192         }
2193
2194         if (oparms->reconnect) {
2195                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2196                 /* indicate that we don't need to relock the file */
2197                 oparms->reconnect = false;
2198         } else
2199                 iov[num].iov_base = create_durable_buf();
2200         if (iov[num].iov_base == NULL)
2201                 return -ENOMEM;
2202         iov[num].iov_len = sizeof(struct create_durable);
2203         if (!req->CreateContextsOffset)
2204                 req->CreateContextsOffset =
2205                         cpu_to_le32(sizeof(struct smb2_create_req) +
2206                                                                 iov[1].iov_len);
2207         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2208         *num_iovec = num + 1;
2209         return 0;
2210 }
2211
2212 /* See MS-SMB2 2.2.13.2.7 */
2213 static struct crt_twarp_ctxt *
2214 create_twarp_buf(__u64 timewarp)
2215 {
2216         struct crt_twarp_ctxt *buf;
2217
2218         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2219         if (!buf)
2220                 return NULL;
2221
2222         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2223                                         (struct crt_twarp_ctxt, Timestamp));
2224         buf->ccontext.DataLength = cpu_to_le32(8);
2225         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2226                                 (struct crt_twarp_ctxt, Name));
2227         buf->ccontext.NameLength = cpu_to_le16(4);
2228         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2229         buf->Name[0] = 'T';
2230         buf->Name[1] = 'W';
2231         buf->Name[2] = 'r';
2232         buf->Name[3] = 'p';
2233         buf->Timestamp = cpu_to_le64(timewarp);
2234         return buf;
2235 }
2236
2237 /* See MS-SMB2 2.2.13.2.7 */
2238 static int
2239 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2240 {
2241         struct smb2_create_req *req = iov[0].iov_base;
2242         unsigned int num = *num_iovec;
2243
2244         iov[num].iov_base = create_twarp_buf(timewarp);
2245         if (iov[num].iov_base == NULL)
2246                 return -ENOMEM;
2247         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2248         if (!req->CreateContextsOffset)
2249                 req->CreateContextsOffset = cpu_to_le32(
2250                                 sizeof(struct smb2_create_req) +
2251                                 iov[num - 1].iov_len);
2252         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2253         *num_iovec = num + 1;
2254         return 0;
2255 }
2256
2257 /* See See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2258 static void setup_owner_group_sids(char *buf)
2259 {
2260         struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2261
2262         /* Populate the user ownership fields S-1-5-88-1 */
2263         sids->owner.Revision = 1;
2264         sids->owner.NumAuth = 3;
2265         sids->owner.Authority[5] = 5;
2266         sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2267         sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2268         sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2269
2270         /* Populate the group ownership fields S-1-5-88-2 */
2271         sids->group.Revision = 1;
2272         sids->group.NumAuth = 3;
2273         sids->group.Authority[5] = 5;
2274         sids->group.SubAuthorities[0] = cpu_to_le32(88);
2275         sids->group.SubAuthorities[1] = cpu_to_le32(2);
2276         sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2277
2278         cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2279 }
2280
2281 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2282 static struct crt_sd_ctxt *
2283 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2284 {
2285         struct crt_sd_ctxt *buf;
2286         __u8 *ptr, *aclptr;
2287         unsigned int acelen, acl_size, ace_count;
2288         unsigned int owner_offset = 0;
2289         unsigned int group_offset = 0;
2290         struct smb3_acl acl;
2291
2292         *len = roundup(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
2293
2294         if (set_owner) {
2295                 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2296                 *len += sizeof(struct owner_group_sids);
2297         }
2298
2299         buf = kzalloc(*len, GFP_KERNEL);
2300         if (buf == NULL)
2301                 return buf;
2302
2303         ptr = (__u8 *)&buf[1];
2304         if (set_owner) {
2305                 /* offset fields are from beginning of security descriptor not of create context */
2306                 owner_offset = ptr - (__u8 *)&buf->sd;
2307                 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2308                 group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2309                 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2310
2311                 setup_owner_group_sids(ptr);
2312                 ptr += sizeof(struct owner_group_sids);
2313         } else {
2314                 buf->sd.OffsetOwner = 0;
2315                 buf->sd.OffsetGroup = 0;
2316         }
2317
2318         buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2319         buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2320         buf->ccontext.NameLength = cpu_to_le16(4);
2321         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2322         buf->Name[0] = 'S';
2323         buf->Name[1] = 'e';
2324         buf->Name[2] = 'c';
2325         buf->Name[3] = 'D';
2326         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2327
2328         /*
2329          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2330          * and "DP" ie the DACL is present
2331          */
2332         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2333
2334         /* offset owner, group and Sbz1 and SACL are all zero */
2335         buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2336         /* Ship the ACL for now. we will copy it into buf later. */
2337         aclptr = ptr;
2338         ptr += sizeof(struct cifs_acl);
2339
2340         /* create one ACE to hold the mode embedded in reserved special SID */
2341         acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode);
2342         ptr += acelen;
2343         acl_size = acelen + sizeof(struct smb3_acl);
2344         ace_count = 1;
2345
2346         if (set_owner) {
2347                 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2348                 acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr);
2349                 ptr += acelen;
2350                 acl_size += acelen;
2351                 ace_count += 1;
2352         }
2353
2354         /* and one more ACE to allow access for authenticated users */
2355         acelen = setup_authusers_ACE((struct cifs_ace *)ptr);
2356         ptr += acelen;
2357         acl_size += acelen;
2358         ace_count += 1;
2359
2360         acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2361         acl.AclSize = cpu_to_le16(acl_size);
2362         acl.AceCount = cpu_to_le16(ace_count);
2363         memcpy(aclptr, &acl, sizeof(struct cifs_acl));
2364
2365         buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2366         *len = ptr - (__u8 *)buf;
2367
2368         return buf;
2369 }
2370
2371 static int
2372 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2373 {
2374         struct smb2_create_req *req = iov[0].iov_base;
2375         unsigned int num = *num_iovec;
2376         unsigned int len = 0;
2377
2378         iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2379         if (iov[num].iov_base == NULL)
2380                 return -ENOMEM;
2381         iov[num].iov_len = len;
2382         if (!req->CreateContextsOffset)
2383                 req->CreateContextsOffset = cpu_to_le32(
2384                                 sizeof(struct smb2_create_req) +
2385                                 iov[num - 1].iov_len);
2386         le32_add_cpu(&req->CreateContextsLength, len);
2387         *num_iovec = num + 1;
2388         return 0;
2389 }
2390
2391 static struct crt_query_id_ctxt *
2392 create_query_id_buf(void)
2393 {
2394         struct crt_query_id_ctxt *buf;
2395
2396         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2397         if (!buf)
2398                 return NULL;
2399
2400         buf->ccontext.DataOffset = cpu_to_le16(0);
2401         buf->ccontext.DataLength = cpu_to_le32(0);
2402         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2403                                 (struct crt_query_id_ctxt, Name));
2404         buf->ccontext.NameLength = cpu_to_le16(4);
2405         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2406         buf->Name[0] = 'Q';
2407         buf->Name[1] = 'F';
2408         buf->Name[2] = 'i';
2409         buf->Name[3] = 'd';
2410         return buf;
2411 }
2412
2413 /* See MS-SMB2 2.2.13.2.9 */
2414 static int
2415 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2416 {
2417         struct smb2_create_req *req = iov[0].iov_base;
2418         unsigned int num = *num_iovec;
2419
2420         iov[num].iov_base = create_query_id_buf();
2421         if (iov[num].iov_base == NULL)
2422                 return -ENOMEM;
2423         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2424         if (!req->CreateContextsOffset)
2425                 req->CreateContextsOffset = cpu_to_le32(
2426                                 sizeof(struct smb2_create_req) +
2427                                 iov[num - 1].iov_len);
2428         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2429         *num_iovec = num + 1;
2430         return 0;
2431 }
2432
2433 static int
2434 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2435                             const char *treename, const __le16 *path)
2436 {
2437         int treename_len, path_len;
2438         struct nls_table *cp;
2439         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2440
2441         /*
2442          * skip leading "\\"
2443          */
2444         treename_len = strlen(treename);
2445         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2446                 return -EINVAL;
2447
2448         treename += 2;
2449         treename_len -= 2;
2450
2451         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2452
2453         /*
2454          * make room for one path separator between the treename and
2455          * path
2456          */
2457         *out_len = treename_len + 1 + path_len;
2458
2459         /*
2460          * final path needs to be null-terminated UTF16 with a
2461          * size aligned to 8
2462          */
2463
2464         *out_size = roundup((*out_len+1)*2, 8);
2465         *out_path = kzalloc(*out_size, GFP_KERNEL);
2466         if (!*out_path)
2467                 return -ENOMEM;
2468
2469         cp = load_nls_default();
2470         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2471         UniStrcat(*out_path, sep);
2472         UniStrcat(*out_path, path);
2473         unload_nls(cp);
2474
2475         return 0;
2476 }
2477
2478 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2479                                umode_t mode, struct cifs_tcon *tcon,
2480                                const char *full_path,
2481                                struct cifs_sb_info *cifs_sb)
2482 {
2483         struct smb_rqst rqst;
2484         struct smb2_create_req *req;
2485         struct smb2_create_rsp *rsp = NULL;
2486         struct cifs_ses *ses = tcon->ses;
2487         struct kvec iov[3]; /* make sure at least one for each open context */
2488         struct kvec rsp_iov = {NULL, 0};
2489         int resp_buftype;
2490         int uni_path_len;
2491         __le16 *copy_path = NULL;
2492         int copy_size;
2493         int rc = 0;
2494         unsigned int n_iov = 2;
2495         __u32 file_attributes = 0;
2496         char *pc_buf = NULL;
2497         int flags = 0;
2498         unsigned int total_len;
2499         __le16 *utf16_path = NULL;
2500         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2501
2502         cifs_dbg(FYI, "mkdir\n");
2503
2504         /* resource #1: path allocation */
2505         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2506         if (!utf16_path)
2507                 return -ENOMEM;
2508
2509         if (!ses || !server) {
2510                 rc = -EIO;
2511                 goto err_free_path;
2512         }
2513
2514         /* resource #2: request */
2515         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2516                                  (void **) &req, &total_len);
2517         if (rc)
2518                 goto err_free_path;
2519
2520
2521         if (smb3_encryption_required(tcon))
2522                 flags |= CIFS_TRANSFORM_REQ;
2523
2524         req->ImpersonationLevel = IL_IMPERSONATION;
2525         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2526         /* File attributes ignored on open (used in create though) */
2527         req->FileAttributes = cpu_to_le32(file_attributes);
2528         req->ShareAccess = FILE_SHARE_ALL_LE;
2529         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2530         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2531
2532         iov[0].iov_base = (char *)req;
2533         /* -1 since last byte is buf[0] which is sent below (path) */
2534         iov[0].iov_len = total_len - 1;
2535
2536         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2537
2538         /* [MS-SMB2] 2.2.13 NameOffset:
2539          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2540          * the SMB2 header, the file name includes a prefix that will
2541          * be processed during DFS name normalization as specified in
2542          * section 3.3.5.9. Otherwise, the file name is relative to
2543          * the share that is identified by the TreeId in the SMB2
2544          * header.
2545          */
2546         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2547                 int name_len;
2548
2549                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2550                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2551                                                  &name_len,
2552                                                  tcon->treeName, utf16_path);
2553                 if (rc)
2554                         goto err_free_req;
2555
2556                 req->NameLength = cpu_to_le16(name_len * 2);
2557                 uni_path_len = copy_size;
2558                 /* free before overwriting resource */
2559                 kfree(utf16_path);
2560                 utf16_path = copy_path;
2561         } else {
2562                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2563                 /* MUST set path len (NameLength) to 0 opening root of share */
2564                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2565                 if (uni_path_len % 8 != 0) {
2566                         copy_size = roundup(uni_path_len, 8);
2567                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2568                         if (!copy_path) {
2569                                 rc = -ENOMEM;
2570                                 goto err_free_req;
2571                         }
2572                         memcpy((char *)copy_path, (const char *)utf16_path,
2573                                uni_path_len);
2574                         uni_path_len = copy_size;
2575                         /* free before overwriting resource */
2576                         kfree(utf16_path);
2577                         utf16_path = copy_path;
2578                 }
2579         }
2580
2581         iov[1].iov_len = uni_path_len;
2582         iov[1].iov_base = utf16_path;
2583         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2584
2585         if (tcon->posix_extensions) {
2586                 /* resource #3: posix buf */
2587                 rc = add_posix_context(iov, &n_iov, mode);
2588                 if (rc)
2589                         goto err_free_req;
2590                 pc_buf = iov[n_iov-1].iov_base;
2591         }
2592
2593
2594         memset(&rqst, 0, sizeof(struct smb_rqst));
2595         rqst.rq_iov = iov;
2596         rqst.rq_nvec = n_iov;
2597
2598         /* no need to inc num_remote_opens because we close it just below */
2599         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2600                                     FILE_WRITE_ATTRIBUTES);
2601         /* resource #4: response buffer */
2602         rc = cifs_send_recv(xid, ses, server,
2603                             &rqst, &resp_buftype, flags, &rsp_iov);
2604         if (rc) {
2605                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2606                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2607                                            CREATE_NOT_FILE,
2608                                            FILE_WRITE_ATTRIBUTES, rc);
2609                 goto err_free_rsp_buf;
2610         }
2611
2612         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2613         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2614                                     ses->Suid, CREATE_NOT_FILE,
2615                                     FILE_WRITE_ATTRIBUTES);
2616
2617         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2618
2619         /* Eventually save off posix specific response info and timestaps */
2620
2621 err_free_rsp_buf:
2622         free_rsp_buf(resp_buftype, rsp);
2623         kfree(pc_buf);
2624 err_free_req:
2625         cifs_small_buf_release(req);
2626 err_free_path:
2627         kfree(utf16_path);
2628         return rc;
2629 }
2630
2631 int
2632 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2633                struct smb_rqst *rqst, __u8 *oplock,
2634                struct cifs_open_parms *oparms, __le16 *path)
2635 {
2636         struct smb2_create_req *req;
2637         unsigned int n_iov = 2;
2638         __u32 file_attributes = 0;
2639         int copy_size;
2640         int uni_path_len;
2641         unsigned int total_len;
2642         struct kvec *iov = rqst->rq_iov;
2643         __le16 *copy_path;
2644         int rc;
2645
2646         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2647                                  (void **) &req, &total_len);
2648         if (rc)
2649                 return rc;
2650
2651         iov[0].iov_base = (char *)req;
2652         /* -1 since last byte is buf[0] which is sent below (path) */
2653         iov[0].iov_len = total_len - 1;
2654
2655         if (oparms->create_options & CREATE_OPTION_READONLY)
2656                 file_attributes |= ATTR_READONLY;
2657         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2658                 file_attributes |= ATTR_SYSTEM;
2659
2660         req->ImpersonationLevel = IL_IMPERSONATION;
2661         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2662         /* File attributes ignored on open (used in create though) */
2663         req->FileAttributes = cpu_to_le32(file_attributes);
2664         req->ShareAccess = FILE_SHARE_ALL_LE;
2665
2666         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2667         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2668         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2669
2670         /* [MS-SMB2] 2.2.13 NameOffset:
2671          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2672          * the SMB2 header, the file name includes a prefix that will
2673          * be processed during DFS name normalization as specified in
2674          * section 3.3.5.9. Otherwise, the file name is relative to
2675          * the share that is identified by the TreeId in the SMB2
2676          * header.
2677          */
2678         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2679                 int name_len;
2680
2681                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2682                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2683                                                  &name_len,
2684                                                  tcon->treeName, path);
2685                 if (rc)
2686                         return rc;
2687                 req->NameLength = cpu_to_le16(name_len * 2);
2688                 uni_path_len = copy_size;
2689                 path = copy_path;
2690         } else {
2691                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2692                 /* MUST set path len (NameLength) to 0 opening root of share */
2693                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2694                 copy_size = uni_path_len;
2695                 if (copy_size % 8 != 0)
2696                         copy_size = roundup(copy_size, 8);
2697                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2698                 if (!copy_path)
2699                         return -ENOMEM;
2700                 memcpy((char *)copy_path, (const char *)path,
2701                        uni_path_len);
2702                 uni_path_len = copy_size;
2703                 path = copy_path;
2704         }
2705
2706         iov[1].iov_len = uni_path_len;
2707         iov[1].iov_base = path;
2708
2709         if ((!server->oplocks) || (tcon->no_lease))
2710                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2711
2712         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2713             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2714                 req->RequestedOplockLevel = *oplock;
2715         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2716                   (oparms->create_options & CREATE_NOT_FILE))
2717                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2718         else {
2719                 rc = add_lease_context(server, iov, &n_iov,
2720                                        oparms->fid->lease_key, oplock);
2721                 if (rc)
2722                         return rc;
2723         }
2724
2725         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2726                 /* need to set Next field of lease context if we request it */
2727                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2728                         struct create_context *ccontext =
2729                             (struct create_context *)iov[n_iov-1].iov_base;
2730                         ccontext->Next =
2731                                 cpu_to_le32(server->vals->create_lease_size);
2732                 }
2733
2734                 rc = add_durable_context(iov, &n_iov, oparms,
2735                                         tcon->use_persistent);
2736                 if (rc)
2737                         return rc;
2738         }
2739
2740         if (tcon->posix_extensions) {
2741                 if (n_iov > 2) {
2742                         struct create_context *ccontext =
2743                             (struct create_context *)iov[n_iov-1].iov_base;
2744                         ccontext->Next =
2745                                 cpu_to_le32(iov[n_iov-1].iov_len);
2746                 }
2747
2748                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2749                 if (rc)
2750                         return rc;
2751         }
2752
2753         if (tcon->snapshot_time) {
2754                 cifs_dbg(FYI, "adding snapshot context\n");
2755                 if (n_iov > 2) {
2756                         struct create_context *ccontext =
2757                             (struct create_context *)iov[n_iov-1].iov_base;
2758                         ccontext->Next =
2759                                 cpu_to_le32(iov[n_iov-1].iov_len);
2760                 }
2761
2762                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2763                 if (rc)
2764                         return rc;
2765         }
2766
2767         if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
2768                 bool set_mode;
2769                 bool set_owner;
2770
2771                 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2772                     (oparms->mode != ACL_NO_MODE))
2773                         set_mode = true;
2774                 else {
2775                         set_mode = false;
2776                         oparms->mode = ACL_NO_MODE;
2777                 }
2778
2779                 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
2780                         set_owner = true;
2781                 else
2782                         set_owner = false;
2783
2784                 if (set_owner | set_mode) {
2785                         if (n_iov > 2) {
2786                                 struct create_context *ccontext =
2787                                     (struct create_context *)iov[n_iov-1].iov_base;
2788                                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2789                         }
2790
2791                         cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2792                         rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
2793                         if (rc)
2794                                 return rc;
2795                 }
2796         }
2797
2798         if (n_iov > 2) {
2799                 struct create_context *ccontext =
2800                         (struct create_context *)iov[n_iov-1].iov_base;
2801                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2802         }
2803         add_query_id_context(iov, &n_iov);
2804
2805         rqst->rq_nvec = n_iov;
2806         return 0;
2807 }
2808
2809 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2810  * All other vectors are freed by kfree().
2811  */
2812 void
2813 SMB2_open_free(struct smb_rqst *rqst)
2814 {
2815         int i;
2816
2817         if (rqst && rqst->rq_iov) {
2818                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2819                 for (i = 1; i < rqst->rq_nvec; i++)
2820                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2821                                 kfree(rqst->rq_iov[i].iov_base);
2822         }
2823 }
2824
2825 int
2826 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2827           __u8 *oplock, struct smb2_file_all_info *buf,
2828           struct create_posix_rsp *posix,
2829           struct kvec *err_iov, int *buftype)
2830 {
2831         struct smb_rqst rqst;
2832         struct smb2_create_rsp *rsp = NULL;
2833         struct cifs_tcon *tcon = oparms->tcon;
2834         struct cifs_ses *ses = tcon->ses;
2835         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2836         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2837         struct kvec rsp_iov = {NULL, 0};
2838         int resp_buftype = CIFS_NO_BUFFER;
2839         int rc = 0;
2840         int flags = 0;
2841
2842         cifs_dbg(FYI, "create/open\n");
2843         if (!ses || !server)
2844                 return -EIO;
2845
2846         if (smb3_encryption_required(tcon))
2847                 flags |= CIFS_TRANSFORM_REQ;
2848
2849         memset(&rqst, 0, sizeof(struct smb_rqst));
2850         memset(&iov, 0, sizeof(iov));
2851         rqst.rq_iov = iov;
2852         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2853
2854         rc = SMB2_open_init(tcon, server,
2855                             &rqst, oplock, oparms, path);
2856         if (rc)
2857                 goto creat_exit;
2858
2859         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2860                 oparms->create_options, oparms->desired_access);
2861
2862         rc = cifs_send_recv(xid, ses, server,
2863                             &rqst, &resp_buftype, flags,
2864                             &rsp_iov);
2865         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2866
2867         if (rc != 0) {
2868                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2869                 if (err_iov && rsp) {
2870                         *err_iov = rsp_iov;
2871                         *buftype = resp_buftype;
2872                         resp_buftype = CIFS_NO_BUFFER;
2873                         rsp = NULL;
2874                 }
2875                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2876                                     oparms->create_options, oparms->desired_access, rc);
2877                 if (rc == -EREMCHG) {
2878                         pr_warn_once("server share %s deleted\n",
2879                                      tcon->treeName);
2880                         tcon->need_reconnect = true;
2881                 }
2882                 goto creat_exit;
2883         } else
2884                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2885                                      ses->Suid, oparms->create_options,
2886                                      oparms->desired_access);
2887
2888         atomic_inc(&tcon->num_remote_opens);
2889         oparms->fid->persistent_fid = rsp->PersistentFileId;
2890         oparms->fid->volatile_fid = rsp->VolatileFileId;
2891         oparms->fid->access = oparms->desired_access;
2892 #ifdef CONFIG_CIFS_DEBUG2
2893         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2894 #endif /* CIFS_DEBUG2 */
2895
2896         if (buf) {
2897                 memcpy(buf, &rsp->CreationTime, 32);
2898                 buf->AllocationSize = rsp->AllocationSize;
2899                 buf->EndOfFile = rsp->EndofFile;
2900                 buf->Attributes = rsp->FileAttributes;
2901                 buf->NumberOfLinks = cpu_to_le32(1);
2902                 buf->DeletePending = 0;
2903         }
2904
2905
2906         smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
2907                             oparms->fid->lease_key, oplock, buf, posix);
2908 creat_exit:
2909         SMB2_open_free(&rqst);
2910         free_rsp_buf(resp_buftype, rsp);
2911         return rc;
2912 }
2913
2914 int
2915 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2916                 struct smb_rqst *rqst,
2917                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2918                 bool is_fsctl, char *in_data, u32 indatalen,
2919                 __u32 max_response_size)
2920 {
2921         struct smb2_ioctl_req *req;
2922         struct kvec *iov = rqst->rq_iov;
2923         unsigned int total_len;
2924         int rc;
2925         char *in_data_buf;
2926
2927         rc = smb2_ioctl_req_init(opcode, tcon, server,
2928                                  (void **) &req, &total_len);
2929         if (rc)
2930                 return rc;
2931
2932         if (indatalen) {
2933                 /*
2934                  * indatalen is usually small at a couple of bytes max, so
2935                  * just allocate through generic pool
2936                  */
2937                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
2938                 if (!in_data_buf) {
2939                         cifs_small_buf_release(req);
2940                         return -ENOMEM;
2941                 }
2942         }
2943
2944         req->CtlCode = cpu_to_le32(opcode);
2945         req->PersistentFileId = persistent_fid;
2946         req->VolatileFileId = volatile_fid;
2947
2948         iov[0].iov_base = (char *)req;
2949         /*
2950          * If no input data, the size of ioctl struct in
2951          * protocol spec still includes a 1 byte data buffer,
2952          * but if input data passed to ioctl, we do not
2953          * want to double count this, so we do not send
2954          * the dummy one byte of data in iovec[0] if sending
2955          * input data (in iovec[1]).
2956          */
2957         if (indatalen) {
2958                 req->InputCount = cpu_to_le32(indatalen);
2959                 /* do not set InputOffset if no input data */
2960                 req->InputOffset =
2961                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2962                 rqst->rq_nvec = 2;
2963                 iov[0].iov_len = total_len - 1;
2964                 iov[1].iov_base = in_data_buf;
2965                 iov[1].iov_len = indatalen;
2966         } else {
2967                 rqst->rq_nvec = 1;
2968                 iov[0].iov_len = total_len;
2969         }
2970
2971         req->OutputOffset = 0;
2972         req->OutputCount = 0; /* MBZ */
2973
2974         /*
2975          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
2976          * We Could increase default MaxOutputResponse, but that could require
2977          * more credits. Windows typically sets this smaller, but for some
2978          * ioctls it may be useful to allow server to send more. No point
2979          * limiting what the server can send as long as fits in one credit
2980          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
2981          * to increase this limit up in the future.
2982          * Note that for snapshot queries that servers like Azure expect that
2983          * the first query be minimal size (and just used to get the number/size
2984          * of previous versions) so response size must be specified as EXACTLY
2985          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2986          * of eight bytes.  Currently that is the only case where we set max
2987          * response size smaller.
2988          */
2989         req->MaxOutputResponse = cpu_to_le32(max_response_size);
2990         req->sync_hdr.CreditCharge =
2991                 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
2992                                          SMB2_MAX_BUFFER_SIZE));
2993         if (is_fsctl)
2994                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2995         else
2996                 req->Flags = 0;
2997
2998         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2999         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3000                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
3001
3002         return 0;
3003 }
3004
3005 void
3006 SMB2_ioctl_free(struct smb_rqst *rqst)
3007 {
3008         int i;
3009         if (rqst && rqst->rq_iov) {
3010                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3011                 for (i = 1; i < rqst->rq_nvec; i++)
3012                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3013                                 kfree(rqst->rq_iov[i].iov_base);
3014         }
3015 }
3016
3017
3018 /*
3019  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
3020  */
3021 int
3022 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3023            u64 volatile_fid, u32 opcode, bool is_fsctl,
3024            char *in_data, u32 indatalen, u32 max_out_data_len,
3025            char **out_data, u32 *plen /* returned data len */)
3026 {
3027         struct smb_rqst rqst;
3028         struct smb2_ioctl_rsp *rsp = NULL;
3029         struct cifs_ses *ses;
3030         struct TCP_Server_Info *server;
3031         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3032         struct kvec rsp_iov = {NULL, 0};
3033         int resp_buftype = CIFS_NO_BUFFER;
3034         int rc = 0;
3035         int flags = 0;
3036
3037         cifs_dbg(FYI, "SMB2 IOCTL\n");
3038
3039         if (out_data != NULL)
3040                 *out_data = NULL;
3041
3042         /* zero out returned data len, in case of error */
3043         if (plen)
3044                 *plen = 0;
3045
3046         if (!tcon)
3047                 return -EIO;
3048
3049         ses = tcon->ses;
3050         if (!ses)
3051                 return -EIO;
3052
3053         server = cifs_pick_channel(ses);
3054         if (!server)
3055                 return -EIO;
3056
3057         if (smb3_encryption_required(tcon))
3058                 flags |= CIFS_TRANSFORM_REQ;
3059
3060         memset(&rqst, 0, sizeof(struct smb_rqst));
3061         memset(&iov, 0, sizeof(iov));
3062         rqst.rq_iov = iov;
3063         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3064
3065         rc = SMB2_ioctl_init(tcon, server,
3066                              &rqst, persistent_fid, volatile_fid, opcode,
3067                              is_fsctl, in_data, indatalen, max_out_data_len);
3068         if (rc)
3069                 goto ioctl_exit;
3070
3071         rc = cifs_send_recv(xid, ses, server,
3072                             &rqst, &resp_buftype, flags,
3073                             &rsp_iov);
3074         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3075
3076         if (rc != 0)
3077                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3078                                 ses->Suid, 0, opcode, rc);
3079
3080         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3081                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3082                 goto ioctl_exit;
3083         } else if (rc == -EINVAL) {
3084                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3085                     (opcode != FSCTL_SRV_COPYCHUNK)) {
3086                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3087                         goto ioctl_exit;
3088                 }
3089         } else if (rc == -E2BIG) {
3090                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3091                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3092                         goto ioctl_exit;
3093                 }
3094         }
3095
3096         /* check if caller wants to look at return data or just return rc */
3097         if ((plen == NULL) || (out_data == NULL))
3098                 goto ioctl_exit;
3099
3100         *plen = le32_to_cpu(rsp->OutputCount);
3101
3102         /* We check for obvious errors in the output buffer length and offset */
3103         if (*plen == 0)
3104                 goto ioctl_exit; /* server returned no data */
3105         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3106                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3107                 *plen = 0;
3108                 rc = -EIO;
3109                 goto ioctl_exit;
3110         }
3111
3112         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3113                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3114                         le32_to_cpu(rsp->OutputOffset));
3115                 *plen = 0;
3116                 rc = -EIO;
3117                 goto ioctl_exit;
3118         }
3119
3120         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3121                             *plen, GFP_KERNEL);
3122         if (*out_data == NULL) {
3123                 rc = -ENOMEM;
3124                 goto ioctl_exit;
3125         }
3126
3127 ioctl_exit:
3128         SMB2_ioctl_free(&rqst);
3129         free_rsp_buf(resp_buftype, rsp);
3130         return rc;
3131 }
3132
3133 /*
3134  *   Individual callers to ioctl worker function follow
3135  */
3136
3137 int
3138 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3139                      u64 persistent_fid, u64 volatile_fid)
3140 {
3141         int rc;
3142         struct  compress_ioctl fsctl_input;
3143         char *ret_data = NULL;
3144
3145         fsctl_input.CompressionState =
3146                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3147
3148         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3149                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
3150                         (char *)&fsctl_input /* data input */,
3151                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3152                         &ret_data /* out data */, NULL);
3153
3154         cifs_dbg(FYI, "set compression rc %d\n", rc);
3155
3156         return rc;
3157 }
3158
3159 int
3160 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3161                 struct smb_rqst *rqst,
3162                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3163 {
3164         struct smb2_close_req *req;
3165         struct kvec *iov = rqst->rq_iov;
3166         unsigned int total_len;
3167         int rc;
3168
3169         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3170                                  (void **) &req, &total_len);
3171         if (rc)
3172                 return rc;
3173
3174         req->PersistentFileId = persistent_fid;
3175         req->VolatileFileId = volatile_fid;
3176         if (query_attrs)
3177                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3178         else
3179                 req->Flags = 0;
3180         iov[0].iov_base = (char *)req;
3181         iov[0].iov_len = total_len;
3182
3183         return 0;
3184 }
3185
3186 void
3187 SMB2_close_free(struct smb_rqst *rqst)
3188 {
3189         if (rqst && rqst->rq_iov)
3190                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3191 }
3192
3193 int
3194 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3195              u64 persistent_fid, u64 volatile_fid,
3196              struct smb2_file_network_open_info *pbuf)
3197 {
3198         struct smb_rqst rqst;
3199         struct smb2_close_rsp *rsp = NULL;
3200         struct cifs_ses *ses = tcon->ses;
3201         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3202         struct kvec iov[1];
3203         struct kvec rsp_iov;
3204         int resp_buftype = CIFS_NO_BUFFER;
3205         int rc = 0;
3206         int flags = 0;
3207         bool query_attrs = false;
3208
3209         cifs_dbg(FYI, "Close\n");
3210
3211         if (!ses || !server)
3212                 return -EIO;
3213
3214         if (smb3_encryption_required(tcon))
3215                 flags |= CIFS_TRANSFORM_REQ;
3216
3217         memset(&rqst, 0, sizeof(struct smb_rqst));
3218         memset(&iov, 0, sizeof(iov));
3219         rqst.rq_iov = iov;
3220         rqst.rq_nvec = 1;
3221
3222         /* check if need to ask server to return timestamps in close response */
3223         if (pbuf)
3224                 query_attrs = true;
3225
3226         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3227         rc = SMB2_close_init(tcon, server,
3228                              &rqst, persistent_fid, volatile_fid,
3229                              query_attrs);
3230         if (rc)
3231                 goto close_exit;
3232
3233         rc = cifs_send_recv(xid, ses, server,
3234                             &rqst, &resp_buftype, flags, &rsp_iov);
3235         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3236
3237         if (rc != 0) {
3238                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3239                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3240                                      rc);
3241                 goto close_exit;
3242         } else {
3243                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3244                                       ses->Suid);
3245                 /*
3246                  * Note that have to subtract 4 since struct network_open_info
3247                  * has a final 4 byte pad that close response does not have
3248                  */
3249                 if (pbuf)
3250                         memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3251         }
3252
3253         atomic_dec(&tcon->num_remote_opens);
3254 close_exit:
3255         SMB2_close_free(&rqst);
3256         free_rsp_buf(resp_buftype, rsp);
3257
3258         /* retry close in a worker thread if this one is interrupted */
3259         if (is_interrupt_error(rc)) {
3260                 int tmp_rc;
3261
3262                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3263                                                      volatile_fid);
3264                 if (tmp_rc)
3265                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3266                                  persistent_fid, tmp_rc);
3267         }
3268         return rc;
3269 }
3270
3271 int
3272 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3273                 u64 persistent_fid, u64 volatile_fid)
3274 {
3275         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3276 }
3277
3278 int
3279 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3280                   struct kvec *iov, unsigned int min_buf_size)
3281 {
3282         unsigned int smb_len = iov->iov_len;
3283         char *end_of_smb = smb_len + (char *)iov->iov_base;
3284         char *begin_of_buf = offset + (char *)iov->iov_base;
3285         char *end_of_buf = begin_of_buf + buffer_length;
3286
3287
3288         if (buffer_length < min_buf_size) {
3289                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3290                          buffer_length, min_buf_size);
3291                 return -EINVAL;
3292         }
3293
3294         /* check if beyond RFC1001 maximum length */
3295         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3296                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3297                          buffer_length, smb_len);
3298                 return -EINVAL;
3299         }
3300
3301         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3302                 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3303                 return -EINVAL;
3304         }
3305
3306         return 0;
3307 }
3308
3309 /*
3310  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3311  * Caller must free buffer.
3312  */
3313 int
3314 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3315                            struct kvec *iov, unsigned int minbufsize,
3316                            char *data)
3317 {
3318         char *begin_of_buf = offset + (char *)iov->iov_base;
3319         int rc;
3320
3321         if (!data)
3322                 return -EINVAL;
3323
3324         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3325         if (rc)
3326                 return rc;
3327
3328         memcpy(data, begin_of_buf, buffer_length);
3329
3330         return 0;
3331 }
3332
3333 int
3334 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3335                      struct smb_rqst *rqst,
3336                      u64 persistent_fid, u64 volatile_fid,
3337                      u8 info_class, u8 info_type, u32 additional_info,
3338                      size_t output_len, size_t input_len, void *input)
3339 {
3340         struct smb2_query_info_req *req;
3341         struct kvec *iov = rqst->rq_iov;
3342         unsigned int total_len;
3343         int rc;
3344
3345         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3346                                  (void **) &req, &total_len);
3347         if (rc)
3348                 return rc;
3349
3350         req->InfoType = info_type;
3351         req->FileInfoClass = info_class;
3352         req->PersistentFileId = persistent_fid;
3353         req->VolatileFileId = volatile_fid;
3354         req->AdditionalInformation = cpu_to_le32(additional_info);
3355
3356         req->OutputBufferLength = cpu_to_le32(output_len);
3357         if (input_len) {
3358                 req->InputBufferLength = cpu_to_le32(input_len);
3359                 /* total_len for smb query request never close to le16 max */
3360                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3361                 memcpy(req->Buffer, input, input_len);
3362         }
3363
3364         iov[0].iov_base = (char *)req;
3365         /* 1 for Buffer */
3366         iov[0].iov_len = total_len - 1 + input_len;
3367         return 0;
3368 }
3369
3370 void
3371 SMB2_query_info_free(struct smb_rqst *rqst)
3372 {
3373         if (rqst && rqst->rq_iov)
3374                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3375 }
3376
3377 static int
3378 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3379            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3380            u32 additional_info, size_t output_len, size_t min_len, void **data,
3381                 u32 *dlen)
3382 {
3383         struct smb_rqst rqst;
3384         struct smb2_query_info_rsp *rsp = NULL;
3385         struct kvec iov[1];
3386         struct kvec rsp_iov;
3387         int rc = 0;
3388         int resp_buftype = CIFS_NO_BUFFER;
3389         struct cifs_ses *ses = tcon->ses;
3390         struct TCP_Server_Info *server;
3391         int flags = 0;
3392         bool allocated = false;
3393
3394         cifs_dbg(FYI, "Query Info\n");
3395
3396         if (!ses)
3397                 return -EIO;
3398         server = cifs_pick_channel(ses);
3399         if (!server)
3400                 return -EIO;
3401
3402         if (smb3_encryption_required(tcon))
3403                 flags |= CIFS_TRANSFORM_REQ;
3404
3405         memset(&rqst, 0, sizeof(struct smb_rqst));
3406         memset(&iov, 0, sizeof(iov));
3407         rqst.rq_iov = iov;
3408         rqst.rq_nvec = 1;
3409
3410         rc = SMB2_query_info_init(tcon, server,
3411                                   &rqst, persistent_fid, volatile_fid,
3412                                   info_class, info_type, additional_info,
3413                                   output_len, 0, NULL);
3414         if (rc)
3415                 goto qinf_exit;
3416
3417         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3418                                     ses->Suid, info_class, (__u32)info_type);
3419
3420         rc = cifs_send_recv(xid, ses, server,
3421                             &rqst, &resp_buftype, flags, &rsp_iov);
3422         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3423
3424         if (rc) {
3425                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3426                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3427                                 ses->Suid, info_class, (__u32)info_type, rc);
3428                 goto qinf_exit;
3429         }
3430
3431         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3432                                 ses->Suid, info_class, (__u32)info_type);
3433
3434         if (dlen) {
3435                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3436                 if (!*data) {
3437                         *data = kmalloc(*dlen, GFP_KERNEL);
3438                         if (!*data) {
3439                                 cifs_tcon_dbg(VFS,
3440                                         "Error %d allocating memory for acl\n",
3441                                         rc);
3442                                 *dlen = 0;
3443                                 rc = -ENOMEM;
3444                                 goto qinf_exit;
3445                         }
3446                         allocated = true;
3447                 }
3448         }
3449
3450         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3451                                         le32_to_cpu(rsp->OutputBufferLength),
3452                                         &rsp_iov, min_len, *data);
3453         if (rc && allocated) {
3454                 kfree(*data);
3455                 *data = NULL;
3456                 *dlen = 0;
3457         }
3458
3459 qinf_exit:
3460         SMB2_query_info_free(&rqst);
3461         free_rsp_buf(resp_buftype, rsp);
3462         return rc;
3463 }
3464
3465 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3466         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3467 {
3468         return query_info(xid, tcon, persistent_fid, volatile_fid,
3469                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3470                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3471                           sizeof(struct smb2_file_all_info), (void **)&data,
3472                           NULL);
3473 }
3474
3475 int
3476 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3477                 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3478 {
3479         size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3480                         (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3481         *plen = 0;
3482
3483         return query_info(xid, tcon, persistent_fid, volatile_fid,
3484                           SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3485                           output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3486 }
3487
3488 int
3489 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3490                u64 persistent_fid, u64 volatile_fid,
3491                void **data, u32 *plen, u32 extra_info)
3492 {
3493         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO |
3494                                 extra_info;
3495         *plen = 0;
3496
3497         return query_info(xid, tcon, persistent_fid, volatile_fid,
3498                           0, SMB2_O_INFO_SECURITY, additional_info,
3499                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3500 }
3501
3502 int
3503 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3504                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3505 {
3506         return query_info(xid, tcon, persistent_fid, volatile_fid,
3507                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3508                           sizeof(struct smb2_file_internal_info),
3509                           sizeof(struct smb2_file_internal_info),
3510                           (void **)&uniqueid, NULL);
3511 }
3512
3513 /*
3514  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3515  * See MS-SMB2 2.2.35 and 2.2.36
3516  */
3517
3518 static int
3519 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3520                  struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3521                  u64 persistent_fid, u64 volatile_fid,
3522                  u32 completion_filter, bool watch_tree)
3523 {
3524         struct smb2_change_notify_req *req;
3525         struct kvec *iov = rqst->rq_iov;
3526         unsigned int total_len;
3527         int rc;
3528
3529         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3530                                  (void **) &req, &total_len);
3531         if (rc)
3532                 return rc;
3533
3534         req->PersistentFileId = persistent_fid;
3535         req->VolatileFileId = volatile_fid;
3536         /* See note 354 of MS-SMB2, 64K max */
3537         req->OutputBufferLength =
3538                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3539         req->CompletionFilter = cpu_to_le32(completion_filter);
3540         if (watch_tree)
3541                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3542         else
3543                 req->Flags = 0;
3544
3545         iov[0].iov_base = (char *)req;
3546         iov[0].iov_len = total_len;
3547
3548         return 0;
3549 }
3550
3551 int
3552 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3553                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3554                 u32 completion_filter)
3555 {
3556         struct cifs_ses *ses = tcon->ses;
3557         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3558         struct smb_rqst rqst;
3559         struct kvec iov[1];
3560         struct kvec rsp_iov = {NULL, 0};
3561         int resp_buftype = CIFS_NO_BUFFER;
3562         int flags = 0;
3563         int rc = 0;
3564
3565         cifs_dbg(FYI, "change notify\n");
3566         if (!ses || !server)
3567                 return -EIO;
3568
3569         if (smb3_encryption_required(tcon))
3570                 flags |= CIFS_TRANSFORM_REQ;
3571
3572         memset(&rqst, 0, sizeof(struct smb_rqst));
3573         memset(&iov, 0, sizeof(iov));
3574         rqst.rq_iov = iov;
3575         rqst.rq_nvec = 1;
3576
3577         rc = SMB2_notify_init(xid, &rqst, tcon, server,
3578                               persistent_fid, volatile_fid,
3579                               completion_filter, watch_tree);
3580         if (rc)
3581                 goto cnotify_exit;
3582
3583         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3584                                 (u8)watch_tree, completion_filter);
3585         rc = cifs_send_recv(xid, ses, server,
3586                             &rqst, &resp_buftype, flags, &rsp_iov);
3587
3588         if (rc != 0) {
3589                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3590                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3591                                 (u8)watch_tree, completion_filter, rc);
3592         } else
3593                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3594                                 ses->Suid, (u8)watch_tree, completion_filter);
3595
3596  cnotify_exit:
3597         if (rqst.rq_iov)
3598                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3599         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3600         return rc;
3601 }
3602
3603
3604
3605 /*
3606  * This is a no-op for now. We're not really interested in the reply, but
3607  * rather in the fact that the server sent one and that server->lstrp
3608  * gets updated.
3609  *
3610  * FIXME: maybe we should consider checking that the reply matches request?
3611  */
3612 static void
3613 smb2_echo_callback(struct mid_q_entry *mid)
3614 {
3615         struct TCP_Server_Info *server = mid->callback_data;
3616         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3617         struct cifs_credits credits = { .value = 0, .instance = 0 };
3618
3619         if (mid->mid_state == MID_RESPONSE_RECEIVED
3620             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3621                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3622                 credits.instance = server->reconnect_instance;
3623         }
3624
3625         DeleteMidQEntry(mid);
3626         add_credits(server, &credits, CIFS_ECHO_OP);
3627 }
3628
3629 void smb2_reconnect_server(struct work_struct *work)
3630 {
3631         struct TCP_Server_Info *server = container_of(work,
3632                                         struct TCP_Server_Info, reconnect.work);
3633         struct cifs_ses *ses;
3634         struct cifs_tcon *tcon, *tcon2;
3635         struct list_head tmp_list;
3636         int tcon_exist = false;
3637         int rc;
3638         int resched = false;
3639
3640
3641         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3642         mutex_lock(&server->reconnect_mutex);
3643
3644         INIT_LIST_HEAD(&tmp_list);
3645         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3646
3647         spin_lock(&cifs_tcp_ses_lock);
3648         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3649                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3650                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3651                                 tcon->tc_count++;
3652                                 list_add_tail(&tcon->rlist, &tmp_list);
3653                                 tcon_exist = true;
3654                         }
3655                 }
3656                 /*
3657                  * IPC has the same lifetime as its session and uses its
3658                  * refcount.
3659                  */
3660                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3661                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3662                         tcon_exist = true;
3663                         ses->ses_count++;
3664                 }
3665         }
3666         /*
3667          * Get the reference to server struct to be sure that the last call of
3668          * cifs_put_tcon() in the loop below won't release the server pointer.
3669          */
3670         if (tcon_exist)
3671                 server->srv_count++;
3672
3673         spin_unlock(&cifs_tcp_ses_lock);
3674
3675         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3676                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3677                 if (!rc)
3678                         cifs_reopen_persistent_handles(tcon);
3679                 else
3680                         resched = true;
3681                 list_del_init(&tcon->rlist);
3682                 if (tcon->ipc)
3683                         cifs_put_smb_ses(tcon->ses);
3684                 else
3685                         cifs_put_tcon(tcon);
3686         }
3687
3688         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3689         if (resched)
3690                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3691         mutex_unlock(&server->reconnect_mutex);
3692
3693         /* now we can safely release srv struct */
3694         if (tcon_exist)
3695                 cifs_put_tcp_session(server, 1);
3696 }
3697
3698 int
3699 SMB2_echo(struct TCP_Server_Info *server)
3700 {
3701         struct smb2_echo_req *req;
3702         int rc = 0;
3703         struct kvec iov[1];
3704         struct smb_rqst rqst = { .rq_iov = iov,
3705                                  .rq_nvec = 1 };
3706         unsigned int total_len;
3707
3708         cifs_dbg(FYI, "In echo request\n");
3709
3710         if (server->tcpStatus == CifsNeedNegotiate) {
3711                 /* No need to send echo on newly established connections */
3712                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
3713                 return rc;
3714         }
3715
3716         rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
3717                                  (void **)&req, &total_len);
3718         if (rc)
3719                 return rc;
3720
3721         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3722
3723         iov[0].iov_len = total_len;
3724         iov[0].iov_base = (char *)req;
3725
3726         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3727                              server, CIFS_ECHO_OP, NULL);
3728         if (rc)
3729                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3730
3731         cifs_small_buf_release(req);
3732         return rc;
3733 }
3734
3735 void
3736 SMB2_flush_free(struct smb_rqst *rqst)
3737 {
3738         if (rqst && rqst->rq_iov)
3739                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3740 }
3741
3742 int
3743 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3744                 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3745                 u64 persistent_fid, u64 volatile_fid)
3746 {
3747         struct smb2_flush_req *req;
3748         struct kvec *iov = rqst->rq_iov;
3749         unsigned int total_len;
3750         int rc;
3751
3752         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
3753                                  (void **) &req, &total_len);
3754         if (rc)
3755                 return rc;
3756
3757         req->PersistentFileId = persistent_fid;
3758         req->VolatileFileId = volatile_fid;
3759
3760         iov[0].iov_base = (char *)req;
3761         iov[0].iov_len = total_len;
3762
3763         return 0;
3764 }
3765
3766 int
3767 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3768            u64 volatile_fid)
3769 {
3770         struct cifs_ses *ses = tcon->ses;
3771         struct smb_rqst rqst;
3772         struct kvec iov[1];
3773         struct kvec rsp_iov = {NULL, 0};
3774         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3775         int resp_buftype = CIFS_NO_BUFFER;
3776         int flags = 0;
3777         int rc = 0;
3778
3779         cifs_dbg(FYI, "flush\n");
3780         if (!ses || !(ses->server))
3781                 return -EIO;
3782
3783         if (smb3_encryption_required(tcon))
3784                 flags |= CIFS_TRANSFORM_REQ;
3785
3786         memset(&rqst, 0, sizeof(struct smb_rqst));
3787         memset(&iov, 0, sizeof(iov));
3788         rqst.rq_iov = iov;
3789         rqst.rq_nvec = 1;
3790
3791         rc = SMB2_flush_init(xid, &rqst, tcon, server,
3792                              persistent_fid, volatile_fid);
3793         if (rc)
3794                 goto flush_exit;
3795
3796         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3797         rc = cifs_send_recv(xid, ses, server,
3798                             &rqst, &resp_buftype, flags, &rsp_iov);
3799
3800         if (rc != 0) {
3801                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3802                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3803                                      rc);
3804         } else
3805                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
3806                                       ses->Suid);
3807
3808  flush_exit:
3809         SMB2_flush_free(&rqst);
3810         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3811         return rc;
3812 }
3813
3814 /*
3815  * To form a chain of read requests, any read requests after the first should
3816  * have the end_of_chain boolean set to true.
3817  */
3818 static int
3819 smb2_new_read_req(void **buf, unsigned int *total_len,
3820         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3821         unsigned int remaining_bytes, int request_type)
3822 {
3823         int rc = -EACCES;
3824         struct smb2_read_plain_req *req = NULL;
3825         struct smb2_sync_hdr *shdr;
3826         struct TCP_Server_Info *server = io_parms->server;
3827
3828         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
3829                                  (void **) &req, total_len);
3830         if (rc)
3831                 return rc;
3832
3833         if (server == NULL)
3834                 return -ECONNABORTED;
3835
3836         shdr = &req->sync_hdr;
3837         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3838
3839         req->PersistentFileId = io_parms->persistent_fid;
3840         req->VolatileFileId = io_parms->volatile_fid;
3841         req->ReadChannelInfoOffset = 0; /* reserved */
3842         req->ReadChannelInfoLength = 0; /* reserved */
3843         req->Channel = 0; /* reserved */
3844         req->MinimumCount = 0;
3845         req->Length = cpu_to_le32(io_parms->length);
3846         req->Offset = cpu_to_le64(io_parms->offset);
3847
3848         trace_smb3_read_enter(0 /* xid */,
3849                         io_parms->persistent_fid,
3850                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3851                         io_parms->offset, io_parms->length);
3852 #ifdef CONFIG_CIFS_SMB_DIRECT
3853         /*
3854          * If we want to do a RDMA write, fill in and append
3855          * smbd_buffer_descriptor_v1 to the end of read request
3856          */
3857         if (server->rdma && rdata && !server->sign &&
3858                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3859
3860                 struct smbd_buffer_descriptor_v1 *v1;
3861                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3862
3863                 rdata->mr = smbd_register_mr(
3864                                 server->smbd_conn, rdata->pages,
3865                                 rdata->nr_pages, rdata->page_offset,
3866                                 rdata->tailsz, true, need_invalidate);
3867                 if (!rdata->mr)
3868                         return -EAGAIN;
3869
3870                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3871                 if (need_invalidate)
3872                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3873                 req->ReadChannelInfoOffset =
3874                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3875                 req->ReadChannelInfoLength =
3876                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3877                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3878                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3879                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3880                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3881
3882                 *total_len += sizeof(*v1) - 1;
3883         }
3884 #endif
3885         if (request_type & CHAINED_REQUEST) {
3886                 if (!(request_type & END_OF_CHAIN)) {
3887                         /* next 8-byte aligned request */
3888                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3889                         shdr->NextCommand = cpu_to_le32(*total_len);
3890                 } else /* END_OF_CHAIN */
3891                         shdr->NextCommand = 0;
3892                 if (request_type & RELATED_REQUEST) {
3893                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3894                         /*
3895                          * Related requests use info from previous read request
3896                          * in chain.
3897                          */
3898                         shdr->SessionId = 0xFFFFFFFF;
3899                         shdr->TreeId = 0xFFFFFFFF;
3900                         req->PersistentFileId = 0xFFFFFFFF;
3901                         req->VolatileFileId = 0xFFFFFFFF;
3902                 }
3903         }
3904         if (remaining_bytes > io_parms->length)
3905                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3906         else
3907                 req->RemainingBytes = 0;
3908
3909         *buf = req;
3910         return rc;
3911 }
3912
3913 static void
3914 smb2_readv_callback(struct mid_q_entry *mid)
3915 {
3916         struct cifs_readdata *rdata = mid->callback_data;
3917         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3918         struct TCP_Server_Info *server = rdata->server;
3919         struct smb2_sync_hdr *shdr =
3920                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3921         struct cifs_credits credits = { .value = 0, .instance = 0 };
3922         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
3923                                  .rq_nvec = 1,
3924                                  .rq_pages = rdata->pages,
3925                                  .rq_offset = rdata->page_offset,
3926                                  .rq_npages = rdata->nr_pages,
3927                                  .rq_pagesz = rdata->pagesz,
3928                                  .rq_tailsz = rdata->tailsz };
3929
3930         WARN_ONCE(rdata->server != mid->server,
3931                   "rdata server %p != mid server %p",
3932                   rdata->server, mid->server);
3933
3934         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3935                  __func__, mid->mid, mid->mid_state, rdata->result,
3936                  rdata->bytes);
3937
3938         switch (mid->mid_state) {
3939         case MID_RESPONSE_RECEIVED:
3940                 credits.value = le16_to_cpu(shdr->CreditRequest);
3941                 credits.instance = server->reconnect_instance;
3942                 /* result already set, check signature */
3943                 if (server->sign && !mid->decrypted) {
3944                         int rc;
3945
3946                         rc = smb2_verify_signature(&rqst, server);
3947                         if (rc)
3948                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
3949                                          rc);
3950                 }
3951                 /* FIXME: should this be counted toward the initiating task? */
3952                 task_io_account_read(rdata->got_bytes);
3953                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3954                 break;
3955         case MID_REQUEST_SUBMITTED:
3956         case MID_RETRY_NEEDED:
3957                 rdata->result = -EAGAIN;
3958                 if (server->sign && rdata->got_bytes)
3959                         /* reset bytes number since we can not check a sign */
3960                         rdata->got_bytes = 0;
3961                 /* FIXME: should this be counted toward the initiating task? */
3962                 task_io_account_read(rdata->got_bytes);
3963                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3964                 break;
3965         case MID_RESPONSE_MALFORMED:
3966                 credits.value = le16_to_cpu(shdr->CreditRequest);
3967                 credits.instance = server->reconnect_instance;
3968                 fallthrough;
3969         default:
3970                 rdata->result = -EIO;
3971         }
3972 #ifdef CONFIG_CIFS_SMB_DIRECT
3973         /*
3974          * If this rdata has a memmory registered, the MR can be freed
3975          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3976          * because they have limited number and are used for future I/Os
3977          */
3978         if (rdata->mr) {
3979                 smbd_deregister_mr(rdata->mr);
3980                 rdata->mr = NULL;
3981         }
3982 #endif
3983         if (rdata->result && rdata->result != -ENODATA) {
3984                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3985                 trace_smb3_read_err(0 /* xid */,
3986                                     rdata->cfile->fid.persistent_fid,
3987                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3988                                     rdata->bytes, rdata->result);
3989         } else
3990                 trace_smb3_read_done(0 /* xid */,
3991                                      rdata->cfile->fid.persistent_fid,
3992                                      tcon->tid, tcon->ses->Suid,
3993                                      rdata->offset, rdata->got_bytes);
3994
3995         queue_work(cifsiod_wq, &rdata->work);
3996         DeleteMidQEntry(mid);
3997         add_credits(server, &credits, 0);
3998 }
3999
4000 /* smb2_async_readv - send an async read, and set up mid to handle result */
4001 int
4002 smb2_async_readv(struct cifs_readdata *rdata)
4003 {
4004         int rc, flags = 0;
4005         char *buf;
4006         struct smb2_sync_hdr *shdr;
4007         struct cifs_io_parms io_parms;
4008         struct smb_rqst rqst = { .rq_iov = rdata->iov,
4009                                  .rq_nvec = 1 };
4010         struct TCP_Server_Info *server;
4011         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4012         unsigned int total_len;
4013
4014         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
4015                  __func__, rdata->offset, rdata->bytes);
4016
4017         if (!rdata->server)
4018                 rdata->server = cifs_pick_channel(tcon->ses);
4019
4020         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
4021         io_parms.server = server = rdata->server;
4022         io_parms.offset = rdata->offset;
4023         io_parms.length = rdata->bytes;
4024         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
4025         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
4026         io_parms.pid = rdata->pid;
4027
4028         rc = smb2_new_read_req(
4029                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4030         if (rc)
4031                 return rc;
4032
4033         if (smb3_encryption_required(io_parms.tcon))
4034                 flags |= CIFS_TRANSFORM_REQ;
4035
4036         rdata->iov[0].iov_base = buf;
4037         rdata->iov[0].iov_len = total_len;
4038
4039         shdr = (struct smb2_sync_hdr *)buf;
4040
4041         if (rdata->credits.value > 0) {
4042                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
4043                                                 SMB2_MAX_BUFFER_SIZE));
4044                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4045
4046                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
4047                 if (rc)
4048                         goto async_readv_out;
4049
4050                 flags |= CIFS_HAS_CREDITS;
4051         }
4052
4053         kref_get(&rdata->refcount);
4054         rc = cifs_call_async(server, &rqst,
4055                              cifs_readv_receive, smb2_readv_callback,
4056                              smb3_handle_read_data, rdata, flags,
4057                              &rdata->credits);
4058         if (rc) {
4059                 kref_put(&rdata->refcount, cifs_readdata_release);
4060                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4061                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4062                                     io_parms.tcon->tid,
4063                                     io_parms.tcon->ses->Suid,
4064                                     io_parms.offset, io_parms.length, rc);
4065         }
4066
4067 async_readv_out:
4068         cifs_small_buf_release(buf);
4069         return rc;
4070 }
4071
4072 int
4073 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4074           unsigned int *nbytes, char **buf, int *buf_type)
4075 {
4076         struct smb_rqst rqst;
4077         int resp_buftype, rc;
4078         struct smb2_read_plain_req *req = NULL;
4079         struct smb2_read_rsp *rsp = NULL;
4080         struct kvec iov[1];
4081         struct kvec rsp_iov;
4082         unsigned int total_len;
4083         int flags = CIFS_LOG_ERROR;
4084         struct cifs_ses *ses = io_parms->tcon->ses;
4085
4086         if (!io_parms->server)
4087                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4088
4089         *nbytes = 0;
4090         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4091         if (rc)
4092                 return rc;
4093
4094         if (smb3_encryption_required(io_parms->tcon))
4095                 flags |= CIFS_TRANSFORM_REQ;
4096
4097         iov[0].iov_base = (char *)req;
4098         iov[0].iov_len = total_len;
4099
4100         memset(&rqst, 0, sizeof(struct smb_rqst));
4101         rqst.rq_iov = iov;
4102         rqst.rq_nvec = 1;
4103
4104         rc = cifs_send_recv(xid, ses, io_parms->server,
4105                             &rqst, &resp_buftype, flags, &rsp_iov);
4106         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4107
4108         if (rc) {
4109                 if (rc != -ENODATA) {
4110                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4111                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
4112                         trace_smb3_read_err(xid, req->PersistentFileId,
4113                                             io_parms->tcon->tid, ses->Suid,
4114                                             io_parms->offset, io_parms->length,
4115                                             rc);
4116                 } else
4117                         trace_smb3_read_done(xid, req->PersistentFileId,
4118                                     io_parms->tcon->tid, ses->Suid,
4119                                     io_parms->offset, 0);
4120                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4121                 cifs_small_buf_release(req);
4122                 return rc == -ENODATA ? 0 : rc;
4123         } else
4124                 trace_smb3_read_done(xid, req->PersistentFileId,
4125                                     io_parms->tcon->tid, ses->Suid,
4126                                     io_parms->offset, io_parms->length);
4127
4128         cifs_small_buf_release(req);
4129
4130         *nbytes = le32_to_cpu(rsp->DataLength);
4131         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4132             (*nbytes > io_parms->length)) {
4133                 cifs_dbg(FYI, "bad length %d for count %d\n",
4134                          *nbytes, io_parms->length);
4135                 rc = -EIO;
4136                 *nbytes = 0;
4137         }
4138
4139         if (*buf) {
4140                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4141                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4142         } else if (resp_buftype != CIFS_NO_BUFFER) {
4143                 *buf = rsp_iov.iov_base;
4144                 if (resp_buftype == CIFS_SMALL_BUFFER)
4145                         *buf_type = CIFS_SMALL_BUFFER;
4146                 else if (resp_buftype == CIFS_LARGE_BUFFER)
4147                         *buf_type = CIFS_LARGE_BUFFER;
4148         }
4149         return rc;
4150 }
4151
4152 /*
4153  * Check the mid_state and signature on received buffer (if any), and queue the
4154  * workqueue completion task.
4155  */
4156 static void
4157 smb2_writev_callback(struct mid_q_entry *mid)
4158 {
4159         struct cifs_writedata *wdata = mid->callback_data;
4160         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4161         struct TCP_Server_Info *server = wdata->server;
4162         unsigned int written;
4163         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4164         struct cifs_credits credits = { .value = 0, .instance = 0 };
4165
4166         WARN_ONCE(wdata->server != mid->server,
4167                   "wdata server %p != mid server %p",
4168                   wdata->server, mid->server);
4169
4170         switch (mid->mid_state) {
4171         case MID_RESPONSE_RECEIVED:
4172                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4173                 credits.instance = server->reconnect_instance;
4174                 wdata->result = smb2_check_receive(mid, server, 0);
4175                 if (wdata->result != 0)
4176                         break;
4177
4178                 written = le32_to_cpu(rsp->DataLength);
4179                 /*
4180                  * Mask off high 16 bits when bytes written as returned
4181                  * by the server is greater than bytes requested by the
4182                  * client. OS/2 servers are known to set incorrect
4183                  * CountHigh values.
4184                  */
4185                 if (written > wdata->bytes)
4186                         written &= 0xFFFF;
4187
4188                 if (written < wdata->bytes)
4189                         wdata->result = -ENOSPC;
4190                 else
4191                         wdata->bytes = written;
4192                 break;
4193         case MID_REQUEST_SUBMITTED:
4194         case MID_RETRY_NEEDED:
4195                 wdata->result = -EAGAIN;
4196                 break;
4197         case MID_RESPONSE_MALFORMED:
4198                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4199                 credits.instance = server->reconnect_instance;
4200                 fallthrough;
4201         default:
4202                 wdata->result = -EIO;
4203                 break;
4204         }
4205 #ifdef CONFIG_CIFS_SMB_DIRECT
4206         /*
4207          * If this wdata has a memory registered, the MR can be freed
4208          * The number of MRs available is limited, it's important to recover
4209          * used MR as soon as I/O is finished. Hold MR longer in the later
4210          * I/O process can possibly result in I/O deadlock due to lack of MR
4211          * to send request on I/O retry
4212          */
4213         if (wdata->mr) {
4214                 smbd_deregister_mr(wdata->mr);
4215                 wdata->mr = NULL;
4216         }
4217 #endif
4218         if (wdata->result) {
4219                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4220                 trace_smb3_write_err(0 /* no xid */,
4221                                      wdata->cfile->fid.persistent_fid,
4222                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4223                                      wdata->bytes, wdata->result);
4224                 if (wdata->result == -ENOSPC)
4225                         pr_warn_once("Out of space writing to %s\n",
4226                                      tcon->treeName);
4227         } else
4228                 trace_smb3_write_done(0 /* no xid */,
4229                                       wdata->cfile->fid.persistent_fid,
4230                                       tcon->tid, tcon->ses->Suid,
4231                                       wdata->offset, wdata->bytes);
4232
4233         queue_work(cifsiod_wq, &wdata->work);
4234         DeleteMidQEntry(mid);
4235         add_credits(server, &credits, 0);
4236 }
4237
4238 /* smb2_async_writev - send an async write, and set up mid to handle result */
4239 int
4240 smb2_async_writev(struct cifs_writedata *wdata,
4241                   void (*release)(struct kref *kref))
4242 {
4243         int rc = -EACCES, flags = 0;
4244         struct smb2_write_req *req = NULL;
4245         struct smb2_sync_hdr *shdr;
4246         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4247         struct TCP_Server_Info *server = wdata->server;
4248         struct kvec iov[1];
4249         struct smb_rqst rqst = { };
4250         unsigned int total_len;
4251
4252         if (!wdata->server)
4253                 server = wdata->server = cifs_pick_channel(tcon->ses);
4254
4255         rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4256                                  (void **) &req, &total_len);
4257         if (rc)
4258                 return rc;
4259
4260         if (smb3_encryption_required(tcon))
4261                 flags |= CIFS_TRANSFORM_REQ;
4262
4263         shdr = (struct smb2_sync_hdr *)req;
4264         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
4265
4266         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
4267         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
4268         req->WriteChannelInfoOffset = 0;
4269         req->WriteChannelInfoLength = 0;
4270         req->Channel = 0;
4271         req->Offset = cpu_to_le64(wdata->offset);
4272         req->DataOffset = cpu_to_le16(
4273                                 offsetof(struct smb2_write_req, Buffer));
4274         req->RemainingBytes = 0;
4275
4276         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
4277                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
4278 #ifdef CONFIG_CIFS_SMB_DIRECT
4279         /*
4280          * If we want to do a server RDMA read, fill in and append
4281          * smbd_buffer_descriptor_v1 to the end of write request
4282          */
4283         if (server->rdma && !server->sign && wdata->bytes >=
4284                 server->smbd_conn->rdma_readwrite_threshold) {
4285
4286                 struct smbd_buffer_descriptor_v1 *v1;
4287                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4288
4289                 wdata->mr = smbd_register_mr(
4290                                 server->smbd_conn, wdata->pages,
4291                                 wdata->nr_pages, wdata->page_offset,
4292                                 wdata->tailsz, false, need_invalidate);
4293                 if (!wdata->mr) {
4294                         rc = -EAGAIN;
4295                         goto async_writev_out;
4296                 }
4297                 req->Length = 0;
4298                 req->DataOffset = 0;
4299                 if (wdata->nr_pages > 1)
4300                         req->RemainingBytes =
4301                                 cpu_to_le32(
4302                                         (wdata->nr_pages - 1) * wdata->pagesz -
4303                                         wdata->page_offset + wdata->tailsz
4304                                 );
4305                 else
4306                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
4307                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4308                 if (need_invalidate)
4309                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4310                 req->WriteChannelInfoOffset =
4311                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4312                 req->WriteChannelInfoLength =
4313                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4314                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4315                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4316                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4317                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4318         }
4319 #endif
4320         iov[0].iov_len = total_len - 1;
4321         iov[0].iov_base = (char *)req;
4322
4323         rqst.rq_iov = iov;
4324         rqst.rq_nvec = 1;
4325         rqst.rq_pages = wdata->pages;
4326         rqst.rq_offset = wdata->page_offset;
4327         rqst.rq_npages = wdata->nr_pages;
4328         rqst.rq_pagesz = wdata->pagesz;
4329         rqst.rq_tailsz = wdata->tailsz;
4330 #ifdef CONFIG_CIFS_SMB_DIRECT
4331         if (wdata->mr) {
4332                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4333                 rqst.rq_npages = 0;
4334         }
4335 #endif
4336         cifs_dbg(FYI, "async write at %llu %u bytes\n",
4337                  wdata->offset, wdata->bytes);
4338
4339 #ifdef CONFIG_CIFS_SMB_DIRECT
4340         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4341         if (!wdata->mr)
4342                 req->Length = cpu_to_le32(wdata->bytes);
4343 #else
4344         req->Length = cpu_to_le32(wdata->bytes);
4345 #endif
4346
4347         if (wdata->credits.value > 0) {
4348                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4349                                                     SMB2_MAX_BUFFER_SIZE));
4350                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4351
4352                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4353                 if (rc)
4354                         goto async_writev_out;
4355
4356                 flags |= CIFS_HAS_CREDITS;
4357         }
4358
4359         kref_get(&wdata->refcount);
4360         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4361                              wdata, flags, &wdata->credits);
4362
4363         if (rc) {
4364                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
4365                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4366                                      wdata->bytes, rc);
4367                 kref_put(&wdata->refcount, release);
4368                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4369         }
4370
4371 async_writev_out:
4372         cifs_small_buf_release(req);
4373         return rc;
4374 }
4375
4376 /*
4377  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4378  * The length field from io_parms must be at least 1 and indicates a number of
4379  * elements with data to write that begins with position 1 in iov array. All
4380  * data length is specified by count.
4381  */
4382 int
4383 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4384            unsigned int *nbytes, struct kvec *iov, int n_vec)
4385 {
4386         struct smb_rqst rqst;
4387         int rc = 0;
4388         struct smb2_write_req *req = NULL;
4389         struct smb2_write_rsp *rsp = NULL;
4390         int resp_buftype;
4391         struct kvec rsp_iov;
4392         int flags = 0;
4393         unsigned int total_len;
4394         struct TCP_Server_Info *server;
4395
4396         *nbytes = 0;
4397
4398         if (n_vec < 1)
4399                 return rc;
4400
4401         if (!io_parms->server)
4402                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4403         server = io_parms->server;
4404         if (server == NULL)
4405                 return -ECONNABORTED;
4406
4407         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
4408                                  (void **) &req, &total_len);
4409         if (rc)
4410                 return rc;
4411
4412         if (smb3_encryption_required(io_parms->tcon))
4413                 flags |= CIFS_TRANSFORM_REQ;
4414
4415         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
4416
4417         req->PersistentFileId = io_parms->persistent_fid;
4418         req->VolatileFileId = io_parms->volatile_fid;
4419         req->WriteChannelInfoOffset = 0;
4420         req->WriteChannelInfoLength = 0;
4421         req->Channel = 0;
4422         req->Length = cpu_to_le32(io_parms->length);
4423         req->Offset = cpu_to_le64(io_parms->offset);
4424         req->DataOffset = cpu_to_le16(
4425                                 offsetof(struct smb2_write_req, Buffer));
4426         req->RemainingBytes = 0;
4427
4428         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4429                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4430                 io_parms->offset, io_parms->length);
4431
4432         iov[0].iov_base = (char *)req;
4433         /* 1 for Buffer */
4434         iov[0].iov_len = total_len - 1;
4435
4436         memset(&rqst, 0, sizeof(struct smb_rqst));
4437         rqst.rq_iov = iov;
4438         rqst.rq_nvec = n_vec + 1;
4439
4440         rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
4441                             &rqst,
4442                             &resp_buftype, flags, &rsp_iov);
4443         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4444
4445         if (rc) {
4446                 trace_smb3_write_err(xid, req->PersistentFileId,
4447                                      io_parms->tcon->tid,
4448                                      io_parms->tcon->ses->Suid,
4449                                      io_parms->offset, io_parms->length, rc);
4450                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4451                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4452         } else {
4453                 *nbytes = le32_to_cpu(rsp->DataLength);
4454                 trace_smb3_write_done(xid, req->PersistentFileId,
4455                                      io_parms->tcon->tid,
4456                                      io_parms->tcon->ses->Suid,
4457                                      io_parms->offset, *nbytes);
4458         }
4459
4460         cifs_small_buf_release(req);
4461         free_rsp_buf(resp_buftype, rsp);
4462         return rc;
4463 }
4464
4465 int posix_info_sid_size(const void *beg, const void *end)
4466 {
4467         size_t subauth;
4468         int total;
4469
4470         if (beg + 1 > end)
4471                 return -1;
4472
4473         subauth = *(u8 *)(beg+1);
4474         if (subauth < 1 || subauth > 15)
4475                 return -1;
4476
4477         total = 1 + 1 + 6 + 4*subauth;
4478         if (beg + total > end)
4479                 return -1;
4480
4481         return total;
4482 }
4483
4484 int posix_info_parse(const void *beg, const void *end,
4485                      struct smb2_posix_info_parsed *out)
4486
4487 {
4488         int total_len = 0;
4489         int sid_len;
4490         int name_len;
4491         const void *owner_sid;
4492         const void *group_sid;
4493         const void *name;
4494
4495         /* if no end bound given, assume payload to be correct */
4496         if (!end) {
4497                 const struct smb2_posix_info *p = beg;
4498
4499                 end = beg + le32_to_cpu(p->NextEntryOffset);
4500                 /* last element will have a 0 offset, pick a sensible bound */
4501                 if (end == beg)
4502                         end += 0xFFFF;
4503         }
4504
4505         /* check base buf */
4506         if (beg + sizeof(struct smb2_posix_info) > end)
4507                 return -1;
4508         total_len = sizeof(struct smb2_posix_info);
4509
4510         /* check owner sid */
4511         owner_sid = beg + total_len;
4512         sid_len = posix_info_sid_size(owner_sid, end);
4513         if (sid_len < 0)
4514                 return -1;
4515         total_len += sid_len;
4516
4517         /* check group sid */
4518         group_sid = beg + total_len;
4519         sid_len = posix_info_sid_size(group_sid, end);
4520         if (sid_len < 0)
4521                 return -1;
4522         total_len += sid_len;
4523
4524         /* check name len */
4525         if (beg + total_len + 4 > end)
4526                 return -1;
4527         name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
4528         if (name_len < 1 || name_len > 0xFFFF)
4529                 return -1;
4530         total_len += 4;
4531
4532         /* check name */
4533         name = beg + total_len;
4534         if (name + name_len > end)
4535                 return -1;
4536         total_len += name_len;
4537
4538         if (out) {
4539                 out->base = beg;
4540                 out->size = total_len;
4541                 out->name_len = name_len;
4542                 out->name = name;
4543                 memcpy(&out->owner, owner_sid,
4544                        posix_info_sid_size(owner_sid, end));
4545                 memcpy(&out->group, group_sid,
4546                        posix_info_sid_size(group_sid, end));
4547         }
4548         return total_len;
4549 }
4550
4551 static int posix_info_extra_size(const void *beg, const void *end)
4552 {
4553         int len = posix_info_parse(beg, end, NULL);
4554
4555         if (len < 0)
4556                 return -1;
4557         return len - sizeof(struct smb2_posix_info);
4558 }
4559
4560 static unsigned int
4561 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
4562             size_t size)
4563 {
4564         int len;
4565         unsigned int entrycount = 0;
4566         unsigned int next_offset = 0;
4567         char *entryptr;
4568         FILE_DIRECTORY_INFO *dir_info;
4569
4570         if (bufstart == NULL)
4571                 return 0;
4572
4573         entryptr = bufstart;
4574
4575         while (1) {
4576                 if (entryptr + next_offset < entryptr ||
4577                     entryptr + next_offset > end_of_buf ||
4578                     entryptr + next_offset + size > end_of_buf) {
4579                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4580                         break;
4581                 }
4582
4583                 entryptr = entryptr + next_offset;
4584                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4585
4586                 if (infotype == SMB_FIND_FILE_POSIX_INFO)
4587                         len = posix_info_extra_size(entryptr, end_of_buf);
4588                 else
4589                         len = le32_to_cpu(dir_info->FileNameLength);
4590
4591                 if (len < 0 ||
4592                     entryptr + len < entryptr ||
4593                     entryptr + len > end_of_buf ||
4594                     entryptr + len + size > end_of_buf) {
4595                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4596                                  end_of_buf);
4597                         break;
4598                 }
4599
4600                 *lastentry = entryptr;
4601                 entrycount++;
4602
4603                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4604                 if (!next_offset)
4605                         break;
4606         }
4607
4608         return entrycount;
4609 }
4610
4611 /*
4612  * Readdir/FindFirst
4613  */
4614 int SMB2_query_directory_init(const unsigned int xid,
4615                               struct cifs_tcon *tcon,
4616                               struct TCP_Server_Info *server,
4617                               struct smb_rqst *rqst,
4618                               u64 persistent_fid, u64 volatile_fid,
4619                               int index, int info_level)
4620 {
4621         struct smb2_query_directory_req *req;
4622         unsigned char *bufptr;
4623         __le16 asteriks = cpu_to_le16('*');
4624         unsigned int output_size = CIFSMaxBufSize -
4625                 MAX_SMB2_CREATE_RESPONSE_SIZE -
4626                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
4627         unsigned int total_len;
4628         struct kvec *iov = rqst->rq_iov;
4629         int len, rc;
4630
4631         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
4632                                  (void **) &req, &total_len);
4633         if (rc)
4634                 return rc;
4635
4636         switch (info_level) {
4637         case SMB_FIND_FILE_DIRECTORY_INFO:
4638                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4639                 break;
4640         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4641                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4642                 break;
4643         case SMB_FIND_FILE_POSIX_INFO:
4644                 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
4645                 break;
4646         default:
4647                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4648                         info_level);
4649                 return -EINVAL;
4650         }
4651
4652         req->FileIndex = cpu_to_le32(index);
4653         req->PersistentFileId = persistent_fid;
4654         req->VolatileFileId = volatile_fid;
4655
4656         len = 0x2;
4657         bufptr = req->Buffer;
4658         memcpy(bufptr, &asteriks, len);
4659
4660         req->FileNameOffset =
4661                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4662         req->FileNameLength = cpu_to_le16(len);
4663         /*
4664          * BB could be 30 bytes or so longer if we used SMB2 specific
4665          * buffer lengths, but this is safe and close enough.
4666          */
4667         output_size = min_t(unsigned int, output_size, server->maxBuf);
4668         output_size = min_t(unsigned int, output_size, 2 << 15);
4669         req->OutputBufferLength = cpu_to_le32(output_size);
4670
4671         iov[0].iov_base = (char *)req;
4672         /* 1 for Buffer */
4673         iov[0].iov_len = total_len - 1;
4674
4675         iov[1].iov_base = (char *)(req->Buffer);
4676         iov[1].iov_len = len;
4677
4678         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4679                         tcon->ses->Suid, index, output_size);
4680
4681         return 0;
4682 }
4683
4684 void SMB2_query_directory_free(struct smb_rqst *rqst)
4685 {
4686         if (rqst && rqst->rq_iov) {
4687                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4688         }
4689 }
4690
4691 int
4692 smb2_parse_query_directory(struct cifs_tcon *tcon,
4693                            struct kvec *rsp_iov,
4694                            int resp_buftype,
4695                            struct cifs_search_info *srch_inf)
4696 {
4697         struct smb2_query_directory_rsp *rsp;
4698         size_t info_buf_size;
4699         char *end_of_smb;
4700         int rc;
4701
4702         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4703
4704         switch (srch_inf->info_level) {
4705         case SMB_FIND_FILE_DIRECTORY_INFO:
4706                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4707                 break;
4708         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4709                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4710                 break;
4711         case SMB_FIND_FILE_POSIX_INFO:
4712                 /* note that posix payload are variable size */
4713                 info_buf_size = sizeof(struct smb2_posix_info);
4714                 break;
4715         default:
4716                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4717                          srch_inf->info_level);
4718                 return -EINVAL;
4719         }
4720
4721         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4722                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4723                                info_buf_size);
4724         if (rc) {
4725                 cifs_tcon_dbg(VFS, "bad info payload");
4726                 return rc;
4727         }
4728
4729         srch_inf->unicode = true;
4730
4731         if (srch_inf->ntwrk_buf_start) {
4732                 if (srch_inf->smallBuf)
4733                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4734                 else
4735                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4736         }
4737         srch_inf->ntwrk_buf_start = (char *)rsp;
4738         srch_inf->srch_entries_start = srch_inf->last_entry =
4739                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4740         end_of_smb = rsp_iov->iov_len + (char *)rsp;
4741
4742         srch_inf->entries_in_buffer = num_entries(
4743                 srch_inf->info_level,
4744                 srch_inf->srch_entries_start,
4745                 end_of_smb,
4746                 &srch_inf->last_entry,
4747                 info_buf_size);
4748
4749         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4750         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4751                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4752                  srch_inf->srch_entries_start, srch_inf->last_entry);
4753         if (resp_buftype == CIFS_LARGE_BUFFER)
4754                 srch_inf->smallBuf = false;
4755         else if (resp_buftype == CIFS_SMALL_BUFFER)
4756                 srch_inf->smallBuf = true;
4757         else
4758                 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
4759
4760         return 0;
4761 }
4762
4763 int
4764 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4765                      u64 persistent_fid, u64 volatile_fid, int index,
4766                      struct cifs_search_info *srch_inf)
4767 {
4768         struct smb_rqst rqst;
4769         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
4770         struct smb2_query_directory_rsp *rsp = NULL;
4771         int resp_buftype = CIFS_NO_BUFFER;
4772         struct kvec rsp_iov;
4773         int rc = 0;
4774         struct cifs_ses *ses = tcon->ses;
4775         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4776         int flags = 0;
4777
4778         if (!ses || !(ses->server))
4779                 return -EIO;
4780
4781         if (smb3_encryption_required(tcon))
4782                 flags |= CIFS_TRANSFORM_REQ;
4783
4784         memset(&rqst, 0, sizeof(struct smb_rqst));
4785         memset(&iov, 0, sizeof(iov));
4786         rqst.rq_iov = iov;
4787         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
4788
4789         rc = SMB2_query_directory_init(xid, tcon, server,
4790                                        &rqst, persistent_fid,
4791                                        volatile_fid, index,
4792                                        srch_inf->info_level);
4793         if (rc)
4794                 goto qdir_exit;
4795
4796         rc = cifs_send_recv(xid, ses, server,
4797                             &rqst, &resp_buftype, flags, &rsp_iov);
4798         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4799
4800         if (rc) {
4801                 if (rc == -ENODATA &&
4802                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4803                         trace_smb3_query_dir_done(xid, persistent_fid,
4804                                 tcon->tid, tcon->ses->Suid, index, 0);
4805                         srch_inf->endOfSearch = true;
4806                         rc = 0;
4807                 } else {
4808                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4809                                 tcon->ses->Suid, index, 0, rc);
4810                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4811                 }
4812                 goto qdir_exit;
4813         }
4814
4815         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
4816                                         srch_inf);
4817         if (rc) {
4818                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4819                         tcon->ses->Suid, index, 0, rc);
4820                 goto qdir_exit;
4821         }
4822         resp_buftype = CIFS_NO_BUFFER;
4823
4824         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4825                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4826
4827 qdir_exit:
4828         SMB2_query_directory_free(&rqst);
4829         free_rsp_buf(resp_buftype, rsp);
4830         return rc;
4831 }
4832
4833 int
4834 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4835                    struct smb_rqst *rqst,
4836                    u64 persistent_fid, u64 volatile_fid, u32 pid,
4837                    u8 info_class, u8 info_type, u32 additional_info,
4838                    void **data, unsigned int *size)
4839 {
4840         struct smb2_set_info_req *req;
4841         struct kvec *iov = rqst->rq_iov;
4842         unsigned int i, total_len;
4843         int rc;
4844
4845         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
4846                                  (void **) &req, &total_len);
4847         if (rc)
4848                 return rc;
4849
4850         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4851         req->InfoType = info_type;
4852         req->FileInfoClass = info_class;
4853         req->PersistentFileId = persistent_fid;
4854         req->VolatileFileId = volatile_fid;
4855         req->AdditionalInformation = cpu_to_le32(additional_info);
4856
4857         req->BufferOffset =
4858                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4859         req->BufferLength = cpu_to_le32(*size);
4860
4861         memcpy(req->Buffer, *data, *size);
4862         total_len += *size;
4863
4864         iov[0].iov_base = (char *)req;
4865         /* 1 for Buffer */
4866         iov[0].iov_len = total_len - 1;
4867
4868         for (i = 1; i < rqst->rq_nvec; i++) {
4869                 le32_add_cpu(&req->BufferLength, size[i]);
4870                 iov[i].iov_base = (char *)data[i];
4871                 iov[i].iov_len = size[i];
4872         }
4873
4874         return 0;
4875 }
4876
4877 void
4878 SMB2_set_info_free(struct smb_rqst *rqst)
4879 {
4880         if (rqst && rqst->rq_iov)
4881                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4882 }
4883
4884 static int
4885 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4886                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4887                u8 info_type, u32 additional_info, unsigned int num,
4888                 void **data, unsigned int *size)
4889 {
4890         struct smb_rqst rqst;
4891         struct smb2_set_info_rsp *rsp = NULL;
4892         struct kvec *iov;
4893         struct kvec rsp_iov;
4894         int rc = 0;
4895         int resp_buftype;
4896         struct cifs_ses *ses = tcon->ses;
4897         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4898         int flags = 0;
4899
4900         if (!ses || !server)
4901                 return -EIO;
4902
4903         if (!num)
4904                 return -EINVAL;
4905
4906         if (smb3_encryption_required(tcon))
4907                 flags |= CIFS_TRANSFORM_REQ;
4908
4909         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4910         if (!iov)
4911                 return -ENOMEM;
4912
4913         memset(&rqst, 0, sizeof(struct smb_rqst));
4914         rqst.rq_iov = iov;
4915         rqst.rq_nvec = num;
4916
4917         rc = SMB2_set_info_init(tcon, server,
4918                                 &rqst, persistent_fid, volatile_fid, pid,
4919                                 info_class, info_type, additional_info,
4920                                 data, size);
4921         if (rc) {
4922                 kfree(iov);
4923                 return rc;
4924         }
4925
4926
4927         rc = cifs_send_recv(xid, ses, server,
4928                             &rqst, &resp_buftype, flags,
4929                             &rsp_iov);
4930         SMB2_set_info_free(&rqst);
4931         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4932
4933         if (rc != 0) {
4934                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4935                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4936                                 ses->Suid, info_class, (__u32)info_type, rc);
4937         }
4938
4939         free_rsp_buf(resp_buftype, rsp);
4940         kfree(iov);
4941         return rc;
4942 }
4943
4944 int
4945 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4946              u64 volatile_fid, u32 pid, __le64 *eof)
4947 {
4948         struct smb2_file_eof_info info;
4949         void *data;
4950         unsigned int size;
4951
4952         info.EndOfFile = *eof;
4953
4954         data = &info;
4955         size = sizeof(struct smb2_file_eof_info);
4956
4957         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4958                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4959                         0, 1, &data, &size);
4960 }
4961
4962 int
4963 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4964                 u64 persistent_fid, u64 volatile_fid,
4965                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4966 {
4967         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4968                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4969                         1, (void **)&pnntsd, &pacllen);
4970 }
4971
4972 int
4973 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4974             u64 persistent_fid, u64 volatile_fid,
4975             struct smb2_file_full_ea_info *buf, int len)
4976 {
4977         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4978                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4979                 0, 1, (void **)&buf, &len);
4980 }
4981
4982 int
4983 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4984                   const u64 persistent_fid, const u64 volatile_fid,
4985                   __u8 oplock_level)
4986 {
4987         struct smb_rqst rqst;
4988         int rc;
4989         struct smb2_oplock_break *req = NULL;
4990         struct cifs_ses *ses = tcon->ses;
4991         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4992         int flags = CIFS_OBREAK_OP;
4993         unsigned int total_len;
4994         struct kvec iov[1];
4995         struct kvec rsp_iov;
4996         int resp_buf_type;
4997
4998         cifs_dbg(FYI, "SMB2_oplock_break\n");
4999         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5000                                  (void **) &req, &total_len);
5001         if (rc)
5002                 return rc;
5003
5004         if (smb3_encryption_required(tcon))
5005                 flags |= CIFS_TRANSFORM_REQ;
5006
5007         req->VolatileFid = volatile_fid;
5008         req->PersistentFid = persistent_fid;
5009         req->OplockLevel = oplock_level;
5010         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5011
5012         flags |= CIFS_NO_RSP_BUF;
5013
5014         iov[0].iov_base = (char *)req;
5015         iov[0].iov_len = total_len;
5016
5017         memset(&rqst, 0, sizeof(struct smb_rqst));
5018         rqst.rq_iov = iov;
5019         rqst.rq_nvec = 1;
5020
5021         rc = cifs_send_recv(xid, ses, server,
5022                             &rqst, &resp_buf_type, flags, &rsp_iov);
5023         cifs_small_buf_release(req);
5024
5025         if (rc) {
5026                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5027                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5028         }
5029
5030         return rc;
5031 }
5032
5033 void
5034 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5035                              struct kstatfs *kst)
5036 {
5037         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5038                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5039         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5040         kst->f_bfree  = kst->f_bavail =
5041                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5042         return;
5043 }
5044
5045 static void
5046 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5047                         struct kstatfs *kst)
5048 {
5049         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5050         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5051         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5052         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5053                 kst->f_bavail = kst->f_bfree;
5054         else
5055                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5056         if (response_data->TotalFileNodes != cpu_to_le64(-1))
5057                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5058         if (response_data->FreeFileNodes != cpu_to_le64(-1))
5059                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5060
5061         return;
5062 }
5063
5064 static int
5065 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5066                    struct TCP_Server_Info *server,
5067                    int level, int outbuf_len, u64 persistent_fid,
5068                    u64 volatile_fid)
5069 {
5070         int rc;
5071         struct smb2_query_info_req *req;
5072         unsigned int total_len;
5073
5074         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5075
5076         if ((tcon->ses == NULL) || server == NULL)
5077                 return -EIO;
5078
5079         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5080                                  (void **) &req, &total_len);
5081         if (rc)
5082                 return rc;
5083
5084         req->InfoType = SMB2_O_INFO_FILESYSTEM;
5085         req->FileInfoClass = level;
5086         req->PersistentFileId = persistent_fid;
5087         req->VolatileFileId = volatile_fid;
5088         /* 1 for pad */
5089         req->InputBufferOffset =
5090                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
5091         req->OutputBufferLength = cpu_to_le32(
5092                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
5093
5094         iov->iov_base = (char *)req;
5095         iov->iov_len = total_len;
5096         return 0;
5097 }
5098
5099 int
5100 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5101               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5102 {
5103         struct smb_rqst rqst;
5104         struct smb2_query_info_rsp *rsp = NULL;
5105         struct kvec iov;
5106         struct kvec rsp_iov;
5107         int rc = 0;
5108         int resp_buftype;
5109         struct cifs_ses *ses = tcon->ses;
5110         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5111         FILE_SYSTEM_POSIX_INFO *info = NULL;
5112         int flags = 0;
5113
5114         rc = build_qfs_info_req(&iov, tcon, server,
5115                                 FS_POSIX_INFORMATION,
5116                                 sizeof(FILE_SYSTEM_POSIX_INFO),
5117                                 persistent_fid, volatile_fid);
5118         if (rc)
5119                 return rc;
5120
5121         if (smb3_encryption_required(tcon))
5122                 flags |= CIFS_TRANSFORM_REQ;
5123
5124         memset(&rqst, 0, sizeof(struct smb_rqst));
5125         rqst.rq_iov = &iov;
5126         rqst.rq_nvec = 1;
5127
5128         rc = cifs_send_recv(xid, ses, server,
5129                             &rqst, &resp_buftype, flags, &rsp_iov);
5130         cifs_small_buf_release(iov.iov_base);
5131         if (rc) {
5132                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5133                 goto posix_qfsinf_exit;
5134         }
5135         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5136
5137         info = (FILE_SYSTEM_POSIX_INFO *)(
5138                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5139         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5140                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5141                                sizeof(FILE_SYSTEM_POSIX_INFO));
5142         if (!rc)
5143                 copy_posix_fs_info_to_kstatfs(info, fsdata);
5144
5145 posix_qfsinf_exit:
5146         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5147         return rc;
5148 }
5149
5150 int
5151 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5152               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5153 {
5154         struct smb_rqst rqst;
5155         struct smb2_query_info_rsp *rsp = NULL;
5156         struct kvec iov;
5157         struct kvec rsp_iov;
5158         int rc = 0;
5159         int resp_buftype;
5160         struct cifs_ses *ses = tcon->ses;
5161         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5162         struct smb2_fs_full_size_info *info = NULL;
5163         int flags = 0;
5164
5165         rc = build_qfs_info_req(&iov, tcon, server,
5166                                 FS_FULL_SIZE_INFORMATION,
5167                                 sizeof(struct smb2_fs_full_size_info),
5168                                 persistent_fid, volatile_fid);
5169         if (rc)
5170                 return rc;
5171
5172         if (smb3_encryption_required(tcon))
5173                 flags |= CIFS_TRANSFORM_REQ;
5174
5175         memset(&rqst, 0, sizeof(struct smb_rqst));
5176         rqst.rq_iov = &iov;
5177         rqst.rq_nvec = 1;
5178
5179         rc = cifs_send_recv(xid, ses, server,
5180                             &rqst, &resp_buftype, flags, &rsp_iov);
5181         cifs_small_buf_release(iov.iov_base);
5182         if (rc) {
5183                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5184                 goto qfsinf_exit;
5185         }
5186         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5187
5188         info = (struct smb2_fs_full_size_info *)(
5189                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5190         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5191                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5192                                sizeof(struct smb2_fs_full_size_info));
5193         if (!rc)
5194                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5195
5196 qfsinf_exit:
5197         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5198         return rc;
5199 }
5200
5201 int
5202 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5203               u64 persistent_fid, u64 volatile_fid, int level)
5204 {
5205         struct smb_rqst rqst;
5206         struct smb2_query_info_rsp *rsp = NULL;
5207         struct kvec iov;
5208         struct kvec rsp_iov;
5209         int rc = 0;
5210         int resp_buftype, max_len, min_len;
5211         struct cifs_ses *ses = tcon->ses;
5212         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5213         unsigned int rsp_len, offset;
5214         int flags = 0;
5215
5216         if (level == FS_DEVICE_INFORMATION) {
5217                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5218                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5219         } else if (level == FS_ATTRIBUTE_INFORMATION) {
5220                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5221                 min_len = MIN_FS_ATTR_INFO_SIZE;
5222         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5223                 max_len = sizeof(struct smb3_fs_ss_info);
5224                 min_len = sizeof(struct smb3_fs_ss_info);
5225         } else if (level == FS_VOLUME_INFORMATION) {
5226                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5227                 min_len = sizeof(struct smb3_fs_vol_info);
5228         } else {
5229                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5230                 return -EINVAL;
5231         }
5232
5233         rc = build_qfs_info_req(&iov, tcon, server,
5234                                 level, max_len,
5235                                 persistent_fid, volatile_fid);
5236         if (rc)
5237                 return rc;
5238
5239         if (smb3_encryption_required(tcon))
5240                 flags |= CIFS_TRANSFORM_REQ;
5241
5242         memset(&rqst, 0, sizeof(struct smb_rqst));
5243         rqst.rq_iov = &iov;
5244         rqst.rq_nvec = 1;
5245
5246         rc = cifs_send_recv(xid, ses, server,
5247                             &rqst, &resp_buftype, flags, &rsp_iov);
5248         cifs_small_buf_release(iov.iov_base);
5249         if (rc) {
5250                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5251                 goto qfsattr_exit;
5252         }
5253         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5254
5255         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5256         offset = le16_to_cpu(rsp->OutputBufferOffset);
5257         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5258         if (rc)
5259                 goto qfsattr_exit;
5260
5261         if (level == FS_ATTRIBUTE_INFORMATION)
5262                 memcpy(&tcon->fsAttrInfo, offset
5263                         + (char *)rsp, min_t(unsigned int,
5264                         rsp_len, max_len));
5265         else if (level == FS_DEVICE_INFORMATION)
5266                 memcpy(&tcon->fsDevInfo, offset
5267                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5268         else if (level == FS_SECTOR_SIZE_INFORMATION) {
5269                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5270                         (offset + (char *)rsp);
5271                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5272                 tcon->perf_sector_size =
5273                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5274         } else if (level == FS_VOLUME_INFORMATION) {
5275                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5276                         (offset + (char *)rsp);
5277                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5278                 tcon->vol_create_time = vol_info->VolumeCreationTime;
5279         }
5280
5281 qfsattr_exit:
5282         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5283         return rc;
5284 }
5285
5286 int
5287 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5288            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5289            const __u32 num_lock, struct smb2_lock_element *buf)
5290 {
5291         struct smb_rqst rqst;
5292         int rc = 0;
5293         struct smb2_lock_req *req = NULL;
5294         struct kvec iov[2];
5295         struct kvec rsp_iov;
5296         int resp_buf_type;
5297         unsigned int count;
5298         int flags = CIFS_NO_RSP_BUF;
5299         unsigned int total_len;
5300         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5301
5302         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
5303
5304         rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
5305                                  (void **) &req, &total_len);
5306         if (rc)
5307                 return rc;
5308
5309         if (smb3_encryption_required(tcon))
5310                 flags |= CIFS_TRANSFORM_REQ;
5311
5312         req->sync_hdr.ProcessId = cpu_to_le32(pid);
5313         req->LockCount = cpu_to_le16(num_lock);
5314
5315         req->PersistentFileId = persist_fid;
5316         req->VolatileFileId = volatile_fid;
5317
5318         count = num_lock * sizeof(struct smb2_lock_element);
5319
5320         iov[0].iov_base = (char *)req;
5321         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
5322         iov[1].iov_base = (char *)buf;
5323         iov[1].iov_len = count;
5324
5325         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
5326
5327         memset(&rqst, 0, sizeof(struct smb_rqst));
5328         rqst.rq_iov = iov;
5329         rqst.rq_nvec = 2;
5330
5331         rc = cifs_send_recv(xid, tcon->ses, server,
5332                             &rqst, &resp_buf_type, flags,
5333                             &rsp_iov);
5334         cifs_small_buf_release(req);
5335         if (rc) {
5336                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
5337                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
5338                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
5339                                     tcon->ses->Suid, rc);
5340         }
5341
5342         return rc;
5343 }
5344
5345 int
5346 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5347           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5348           const __u64 length, const __u64 offset, const __u32 lock_flags,
5349           const bool wait)
5350 {
5351         struct smb2_lock_element lock;
5352
5353         lock.Offset = cpu_to_le64(offset);
5354         lock.Length = cpu_to_le64(length);
5355         lock.Flags = cpu_to_le32(lock_flags);
5356         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5357                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5358
5359         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5360 }
5361
5362 int
5363 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5364                  __u8 *lease_key, const __le32 lease_state)
5365 {
5366         struct smb_rqst rqst;
5367         int rc;
5368         struct smb2_lease_ack *req = NULL;
5369         struct cifs_ses *ses = tcon->ses;
5370         int flags = CIFS_OBREAK_OP;
5371         unsigned int total_len;
5372         struct kvec iov[1];
5373         struct kvec rsp_iov;
5374         int resp_buf_type;
5375         __u64 *please_key_high;
5376         __u64 *please_key_low;
5377         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5378
5379         cifs_dbg(FYI, "SMB2_lease_break\n");
5380         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5381                                  (void **) &req, &total_len);
5382         if (rc)
5383                 return rc;
5384
5385         if (smb3_encryption_required(tcon))
5386                 flags |= CIFS_TRANSFORM_REQ;
5387
5388         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5389         req->StructureSize = cpu_to_le16(36);
5390         total_len += 12;
5391
5392         memcpy(req->LeaseKey, lease_key, 16);
5393         req->LeaseState = lease_state;
5394
5395         flags |= CIFS_NO_RSP_BUF;
5396
5397         iov[0].iov_base = (char *)req;
5398         iov[0].iov_len = total_len;
5399
5400         memset(&rqst, 0, sizeof(struct smb_rqst));
5401         rqst.rq_iov = iov;
5402         rqst.rq_nvec = 1;
5403
5404         rc = cifs_send_recv(xid, ses, server,
5405                             &rqst, &resp_buf_type, flags, &rsp_iov);
5406         cifs_small_buf_release(req);
5407
5408         please_key_low = (__u64 *)lease_key;
5409         please_key_high = (__u64 *)(lease_key+8);
5410         if (rc) {
5411                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5412                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5413                         ses->Suid, *please_key_low, *please_key_high, rc);
5414                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5415         } else
5416                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5417                         ses->Suid, *please_key_low, *please_key_high);
5418
5419         return rc;
5420 }