fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/uuid.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/xattr.h>
  39 #include "smb2pdu.h"
  40 #include "cifsglob.h"
  41 #include "cifsacl.h"
  42 #include "cifsproto.h"
  43 #include "smb2proto.h"
  44 #include "cifs_unicode.h"
  45 #include "cifs_debug.h"
  46 #include "ntlmssp.h"
  47 #include "smb2status.h"
  48 #include "smb2glob.h"
  49 #include "cifspdu.h"
  50 #include "cifs_spnego.h"
  51 #include "smbdirect.h"
  52 #include "trace.h"
  53 #ifdef CONFIG_CIFS_DFS_UPCALL
  54 #include "dfs_cache.h"
  55 #endif
  56
  57 /*
  58  *  The following table defines the expected "StructureSize" of SMB2 requests
  59  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  60  *
  61  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  62  *  indexed by command in host byte order.
  63  */
  64 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  65         /* SMB2_NEGOTIATE */ 36,
  66         /* SMB2_SESSION_SETUP */ 25,
  67         /* SMB2_LOGOFF */ 4,
  68         /* SMB2_TREE_CONNECT */ 9,
  69         /* SMB2_TREE_DISCONNECT */ 4,
  70         /* SMB2_CREATE */ 57,
  71         /* SMB2_CLOSE */ 24,
  72         /* SMB2_FLUSH */ 24,
  73         /* SMB2_READ */ 49,
  74         /* SMB2_WRITE */ 49,
  75         /* SMB2_LOCK */ 48,
  76         /* SMB2_IOCTL */ 57,
  77         /* SMB2_CANCEL */ 4,
  78         /* SMB2_ECHO */ 4,
  79         /* SMB2_QUERY_DIRECTORY */ 33,
  80         /* SMB2_CHANGE_NOTIFY */ 32,
  81         /* SMB2_QUERY_INFO */ 41,
  82         /* SMB2_SET_INFO */ 33,
  83         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  84 };
  85
  86 int smb3_encryption_required(const struct cifs_tcon *tcon)
  87 {
  88         if (!tcon || !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->DialectCount = cpu_to_le16(2);
 818                 total_len += 4;
 819         } else if (strcmp(server->vals->version_string,
 820                    SMBDEFAULT_VERSION_STRING) == 0) {
 821                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 822                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 823                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 824                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 825                 req->DialectCount = cpu_to_le16(4);
 826                 total_len += 8;
 827         } else {
 828                 /* otherwise send specific dialect */
 829                 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
 830                 req->DialectCount = cpu_to_le16(1);
 831                 total_len += 2;
 832         }
 833
 834         /* only one of SMB2 signing flags may be set in SMB2 request */
 835         if (ses->sign)
 836                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 837         else if (global_secflags & CIFSSEC_MAY_SIGN)
 838                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 839         else
 840                 req->SecurityMode = 0;
 841
 842         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
 843
 844         /* ClientGUID must be zero for SMB2.02 dialect */
 845         if (server->vals->protocol_id == SMB20_PROT_ID)
 846                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 847         else {
 848                 memcpy(req->ClientGUID, server->client_guid,
 849                         SMB2_CLIENT_GUID_SIZE);
 850                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
 851                     (strcmp(server->vals->version_string,
 852                      SMBDEFAULT_VERSION_STRING) == 0))
 853                         assemble_neg_contexts(req, server, &total_len);
 854         }
 855         iov[0].iov_base = (char *)req;
 856         iov[0].iov_len = total_len;
 857
 858         memset(&rqst, 0, sizeof(struct smb_rqst));
 859         rqst.rq_iov = iov;
 860         rqst.rq_nvec = 1;
 861
 862         rc = cifs_send_recv(xid, ses, server,
 863                             &rqst, &resp_buftype, flags, &rsp_iov);
 864         cifs_small_buf_release(req);
 865         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 866         /*
 867          * No tcon so can't do
 868          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 869          */
 870         if (rc == -EOPNOTSUPP) {
 871                 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");
 872                 goto neg_exit;
 873         } else if (rc != 0)
 874                 goto neg_exit;
 875
 876         if (strcmp(server->vals->version_string,
 877                    SMB3ANY_VERSION_STRING) == 0) {
 878                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 879                         cifs_server_dbg(VFS,
 880                                 "SMB2 dialect returned but not requested\n");
 881                         return -EIO;
 882                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 883                         cifs_server_dbg(VFS,
 884                                 "SMB2.1 dialect returned but not requested\n");
 885                         return -EIO;
 886                 }
 887         } else if (strcmp(server->vals->version_string,
 888                    SMBDEFAULT_VERSION_STRING) == 0) {
 889                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 890                         cifs_server_dbg(VFS,
 891                                 "SMB2 dialect returned but not requested\n");
 892                         return -EIO;
 893                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 894                         /* ops set to 3.0 by default for default so update */
 895                         server->ops = &smb21_operations;
 896                         server->vals = &smb21_values;
 897                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 898                         server->ops = &smb311_operations;
 899                         server->vals = &smb311_values;
 900                 }
 901         } else if (le16_to_cpu(rsp->DialectRevision) !=
 902                                 server->vals->protocol_id) {
 903                 /* if requested single dialect ensure returned dialect matched */
 904                 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
 905                                 le16_to_cpu(rsp->DialectRevision));
 906                 return -EIO;
 907         }
 908
 909         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 910
 911         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 912                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 913         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 914                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 915         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 916                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 917         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 918                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 919         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 920                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 921         else {
 922                 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
 923                                 le16_to_cpu(rsp->DialectRevision));
 924                 rc = -EIO;
 925                 goto neg_exit;
 926         }
 927         server->dialect = le16_to_cpu(rsp->DialectRevision);
 928
 929         /*
 930          * Keep a copy of the hash after negprot. This hash will be
 931          * the starting hash value for all sessions made from this
 932          * server.
 933          */
 934         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 935                SMB2_PREAUTH_HASH_SIZE);
 936
 937         /* SMB2 only has an extended negflavor */
 938         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 939         /* set it to the maximum buffer size value we can send with 1 credit */
 940         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 941                                SMB2_MAX_BUFFER_SIZE);
 942         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 943         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 944         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 945         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 946                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 947                                 server->sec_mode);
 948         server->capabilities = le32_to_cpu(rsp->Capabilities);
 949         /* Internal types */
 950         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 951
 952         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 953                                                (struct smb2_sync_hdr *)rsp);
 954         /*
 955          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 956          * for us will be
 957          *      ses->sectype = RawNTLMSSP;
 958          * but for time being this is our only auth choice so doesn't matter.
 959          * We just found a server which sets blob length to zero expecting raw.
 960          */
 961         if (blob_length == 0) {
 962                 cifs_dbg(FYI, "missing security blob on negprot\n");
 963                 server->sec_ntlmssp = true;
 964         }
 965
 966         rc = cifs_enable_signing(server, ses->sign);
 967         if (rc)
 968                 goto neg_exit;
 969         if (blob_length) {
 970                 rc = decode_negTokenInit(security_blob, blob_length, server);
 971                 if (rc == 1)
 972                         rc = 0;
 973                 else if (rc == 0)
 974                         rc = -EIO;
 975         }
 976
 977         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 978                 if (rsp->NegotiateContextCount)
 979                         rc = smb311_decode_neg_context(rsp, server,
 980                                                        rsp_iov.iov_len);
 981                 else
 982                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
 983         }
 984 neg_exit:
 985         free_rsp_buf(resp_buftype, rsp);
 986         return rc;
 987 }
 988
 989 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 990 {
 991         int rc;
 992         struct validate_negotiate_info_req *pneg_inbuf;
 993         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 994         u32 rsplen;
 995         u32 inbuflen; /* max of 4 dialects */
 996         struct TCP_Server_Info *server = tcon->ses->server;
 997
 998         cifs_dbg(FYI, "validate negotiate\n");
 999
1000         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1001         if (server->dialect == SMB311_PROT_ID)
1002                 return 0;
1003
1004         /*
1005          * validation ioctl must be signed, so no point sending this if we
1006          * can not sign it (ie are not known user).  Even if signing is not
1007          * required (enabled but not negotiated), in those cases we selectively
1008          * sign just this, the first and only signed request on a connection.
1009          * Having validation of negotiate info  helps reduce attack vectors.
1010          */
1011         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1012                 return 0; /* validation requires signing */
1013
1014         if (tcon->ses->user_name == NULL) {
1015                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1016                 return 0; /* validation requires signing */
1017         }
1018
1019         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1020                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1021
1022         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1023         if (!pneg_inbuf)
1024                 return -ENOMEM;
1025
1026         pneg_inbuf->Capabilities =
1027                         cpu_to_le32(server->vals->req_capabilities);
1028         memcpy(pneg_inbuf->Guid, server->client_guid,
1029                                         SMB2_CLIENT_GUID_SIZE);
1030
1031         if (tcon->ses->sign)
1032                 pneg_inbuf->SecurityMode =
1033                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1034         else if (global_secflags & CIFSSEC_MAY_SIGN)
1035                 pneg_inbuf->SecurityMode =
1036                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1037         else
1038                 pneg_inbuf->SecurityMode = 0;
1039
1040
1041         if (strcmp(server->vals->version_string,
1042                 SMB3ANY_VERSION_STRING) == 0) {
1043                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1044                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1045                 pneg_inbuf->DialectCount = cpu_to_le16(2);
1046                 /* structure is big enough for 3 dialects, sending only 2 */
1047                 inbuflen = sizeof(*pneg_inbuf) -
1048                                 (2 * sizeof(pneg_inbuf->Dialects[0]));
1049         } else if (strcmp(server->vals->version_string,
1050                 SMBDEFAULT_VERSION_STRING) == 0) {
1051                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1052                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1053                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1054                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1055                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1056                 /* structure is big enough for 3 dialects */
1057                 inbuflen = sizeof(*pneg_inbuf);
1058         } else {
1059                 /* otherwise specific dialect was requested */
1060                 pneg_inbuf->Dialects[0] =
1061                         cpu_to_le16(server->vals->protocol_id);
1062                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1063                 /* structure is big enough for 3 dialects, sending only 1 */
1064                 inbuflen = sizeof(*pneg_inbuf) -
1065                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
1066         }
1067
1068         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1069                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1070                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1071                 (char **)&pneg_rsp, &rsplen);
1072         if (rc == -EOPNOTSUPP) {
1073                 /*
1074                  * Old Windows versions or Netapp SMB server can return
1075                  * not supported error. Client should accept it.
1076                  */
1077                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1078                 rc = 0;
1079                 goto out_free_inbuf;
1080         } else if (rc != 0) {
1081                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1082                               rc);
1083                 rc = -EIO;
1084                 goto out_free_inbuf;
1085         }
1086
1087         rc = -EIO;
1088         if (rsplen != sizeof(*pneg_rsp)) {
1089                 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1090                               rsplen);
1091
1092                 /* relax check since Mac returns max bufsize allowed on ioctl */
1093                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1094                         goto out_free_rsp;
1095         }
1096
1097         /* check validate negotiate info response matches what we got earlier */
1098         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1099                 goto vneg_out;
1100
1101         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1102                 goto vneg_out;
1103
1104         /* do not validate server guid because not saved at negprot time yet */
1105
1106         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1107               SMB2_LARGE_FILES) != server->capabilities)
1108                 goto vneg_out;
1109
1110         /* validate negotiate successful */
1111         rc = 0;
1112         cifs_dbg(FYI, "validate negotiate info successful\n");
1113         goto out_free_rsp;
1114
1115 vneg_out:
1116         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1117 out_free_rsp:
1118         kfree(pneg_rsp);
1119 out_free_inbuf:
1120         kfree(pneg_inbuf);
1121         return rc;
1122 }
1123
1124 enum securityEnum
1125 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1126 {
1127         switch (requested) {
1128         case Kerberos:
1129         case RawNTLMSSP:
1130                 return requested;
1131         case NTLMv2:
1132                 return RawNTLMSSP;
1133         case Unspecified:
1134                 if (server->sec_ntlmssp &&
1135                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1136                         return RawNTLMSSP;
1137                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1138                         (global_secflags & CIFSSEC_MAY_KRB5))
1139                         return Kerberos;
1140                 fallthrough;
1141         default:
1142                 return Unspecified;
1143         }
1144 }
1145
1146 struct SMB2_sess_data {
1147         unsigned int xid;
1148         struct cifs_ses *ses;
1149         struct nls_table *nls_cp;
1150         void (*func)(struct SMB2_sess_data *);
1151         int result;
1152         u64 previous_session;
1153
1154         /* we will send the SMB in three pieces:
1155          * a fixed length beginning part, an optional
1156          * SPNEGO blob (which can be zero length), and a
1157          * last part which will include the strings
1158          * and rest of bcc area. This allows us to avoid
1159          * a large buffer 17K allocation
1160          */
1161         int buf0_type;
1162         struct kvec iov[2];
1163 };
1164
1165 static int
1166 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1167 {
1168         int rc;
1169         struct cifs_ses *ses = sess_data->ses;
1170         struct smb2_sess_setup_req *req;
1171         struct TCP_Server_Info *server = cifs_ses_server(ses);
1172         unsigned int total_len;
1173
1174         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1175                                  (void **) &req,
1176                                  &total_len);
1177         if (rc)
1178                 return rc;
1179
1180         if (sess_data->ses->binding) {
1181                 req->sync_hdr.SessionId = sess_data->ses->Suid;
1182                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1183                 req->PreviousSessionId = 0;
1184                 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1185         } else {
1186                 /* First session, not a reauthenticate */
1187                 req->sync_hdr.SessionId = 0;
1188                 /*
1189                  * if reconnect, we need to send previous sess id
1190                  * otherwise it is 0
1191                  */
1192                 req->PreviousSessionId = sess_data->previous_session;
1193                 req->Flags = 0; /* MBZ */
1194         }
1195
1196         /* enough to enable echos and oplocks and one max size write */
1197         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1198
1199         /* only one of SMB2 signing flags may be set in SMB2 request */
1200         if (server->sign)
1201                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1202         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1203                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1204         else
1205                 req->SecurityMode = 0;
1206
1207 #ifdef CONFIG_CIFS_DFS_UPCALL
1208         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1209 #else
1210         req->Capabilities = 0;
1211 #endif /* DFS_UPCALL */
1212
1213         req->Channel = 0; /* MBZ */
1214
1215         sess_data->iov[0].iov_base = (char *)req;
1216         /* 1 for pad */
1217         sess_data->iov[0].iov_len = total_len - 1;
1218         /*
1219          * This variable will be used to clear the buffer
1220          * allocated above in case of any error in the calling function.
1221          */
1222         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1223
1224         return 0;
1225 }
1226
1227 static void
1228 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1229 {
1230         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1231         sess_data->buf0_type = CIFS_NO_BUFFER;
1232 }
1233
1234 static int
1235 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1236 {
1237         int rc;
1238         struct smb_rqst rqst;
1239         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1240         struct kvec rsp_iov = { NULL, 0 };
1241
1242         /* Testing shows that buffer offset must be at location of Buffer[0] */
1243         req->SecurityBufferOffset =
1244                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1245         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1246
1247         memset(&rqst, 0, sizeof(struct smb_rqst));
1248         rqst.rq_iov = sess_data->iov;
1249         rqst.rq_nvec = 2;
1250
1251         /* BB add code to build os and lm fields */
1252         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1253                             cifs_ses_server(sess_data->ses),
1254                             &rqst,
1255                             &sess_data->buf0_type,
1256                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1257         cifs_small_buf_release(sess_data->iov[0].iov_base);
1258         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1259
1260         return rc;
1261 }
1262
1263 static int
1264 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1265 {
1266         int rc = 0;
1267         struct cifs_ses *ses = sess_data->ses;
1268         struct TCP_Server_Info *server = cifs_ses_server(ses);
1269
1270         mutex_lock(&server->srv_mutex);
1271         if (server->ops->generate_signingkey) {
1272                 rc = server->ops->generate_signingkey(ses);
1273                 if (rc) {
1274                         cifs_dbg(FYI,
1275                                 "SMB3 session key generation failed\n");
1276                         mutex_unlock(&server->srv_mutex);
1277                         return rc;
1278                 }
1279         }
1280         if (!server->session_estab) {
1281                 server->sequence_number = 0x2;
1282                 server->session_estab = true;
1283         }
1284         mutex_unlock(&server->srv_mutex);
1285
1286         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1287         /* keep existing ses state if binding */
1288         if (!ses->binding) {
1289                 spin_lock(&GlobalMid_Lock);
1290                 ses->status = CifsGood;
1291                 ses->need_reconnect = false;
1292                 spin_unlock(&GlobalMid_Lock);
1293         }
1294
1295         return rc;
1296 }
1297
1298 #ifdef CONFIG_CIFS_UPCALL
1299 static void
1300 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1301 {
1302         int rc;
1303         struct cifs_ses *ses = sess_data->ses;
1304         struct cifs_spnego_msg *msg;
1305         struct key *spnego_key = NULL;
1306         struct smb2_sess_setup_rsp *rsp = NULL;
1307
1308         rc = SMB2_sess_alloc_buffer(sess_data);
1309         if (rc)
1310                 goto out;
1311
1312         spnego_key = cifs_get_spnego_key(ses);
1313         if (IS_ERR(spnego_key)) {
1314                 rc = PTR_ERR(spnego_key);
1315                 if (rc == -ENOKEY)
1316                         cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1317                 spnego_key = NULL;
1318                 goto out;
1319         }
1320
1321         msg = spnego_key->payload.data[0];
1322         /*
1323          * check version field to make sure that cifs.upcall is
1324          * sending us a response in an expected form
1325          */
1326         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1327                 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1328                          CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1329                 rc = -EKEYREJECTED;
1330                 goto out_put_spnego_key;
1331         }
1332
1333         /* keep session key if binding */
1334         if (!ses->binding) {
1335                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1336                                                  GFP_KERNEL);
1337                 if (!ses->auth_key.response) {
1338                         cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1339                                  msg->sesskey_len);
1340                         rc = -ENOMEM;
1341                         goto out_put_spnego_key;
1342                 }
1343                 ses->auth_key.len = msg->sesskey_len;
1344         }
1345
1346         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1347         sess_data->iov[1].iov_len = msg->secblob_len;
1348
1349         rc = SMB2_sess_sendreceive(sess_data);
1350         if (rc)
1351                 goto out_put_spnego_key;
1352
1353         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1354         /* keep session id and flags if binding */
1355         if (!ses->binding) {
1356                 ses->Suid = rsp->sync_hdr.SessionId;
1357                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1358         }
1359
1360         rc = SMB2_sess_establish_session(sess_data);
1361 out_put_spnego_key:
1362         key_invalidate(spnego_key);
1363         key_put(spnego_key);
1364 out:
1365         sess_data->result = rc;
1366         sess_data->func = NULL;
1367         SMB2_sess_free_buffer(sess_data);
1368 }
1369 #else
1370 static void
1371 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1372 {
1373         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1374         sess_data->result = -EOPNOTSUPP;
1375         sess_data->func = NULL;
1376 }
1377 #endif
1378
1379 static void
1380 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1381
1382 static void
1383 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1384 {
1385         int rc;
1386         struct cifs_ses *ses = sess_data->ses;
1387         struct smb2_sess_setup_rsp *rsp = NULL;
1388         char *ntlmssp_blob = NULL;
1389         bool use_spnego = false; /* else use raw ntlmssp */
1390         u16 blob_length = 0;
1391
1392         /*
1393          * If memory allocation is successful, caller of this function
1394          * frees it.
1395          */
1396         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1397         if (!ses->ntlmssp) {
1398                 rc = -ENOMEM;
1399                 goto out_err;
1400         }
1401         ses->ntlmssp->sesskey_per_smbsess = true;
1402
1403         rc = SMB2_sess_alloc_buffer(sess_data);
1404         if (rc)
1405                 goto out_err;
1406
1407         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1408                                GFP_KERNEL);
1409         if (ntlmssp_blob == NULL) {
1410                 rc = -ENOMEM;
1411                 goto out;
1412         }
1413
1414         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1415         if (use_spnego) {
1416                 /* BB eventually need to add this */
1417                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1418                 rc = -EOPNOTSUPP;
1419                 goto out;
1420         } else {
1421                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1422                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1423         }
1424         sess_data->iov[1].iov_base = ntlmssp_blob;
1425         sess_data->iov[1].iov_len = blob_length;
1426
1427         rc = SMB2_sess_sendreceive(sess_data);
1428         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1429
1430         /* If true, rc here is expected and not an error */
1431         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1432                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1433                 rc = 0;
1434
1435         if (rc)
1436                 goto out;
1437
1438         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1439                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1440                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1441                         le16_to_cpu(rsp->SecurityBufferOffset));
1442                 rc = -EIO;
1443                 goto out;
1444         }
1445         rc = decode_ntlmssp_challenge(rsp->Buffer,
1446                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1447         if (rc)
1448                 goto out;
1449
1450         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1451
1452         /* keep existing ses id and flags if binding */
1453         if (!ses->binding) {
1454                 ses->Suid = rsp->sync_hdr.SessionId;
1455                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1456         }
1457
1458 out:
1459         kfree(ntlmssp_blob);
1460         SMB2_sess_free_buffer(sess_data);
1461         if (!rc) {
1462                 sess_data->result = 0;
1463                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1464                 return;
1465         }
1466 out_err:
1467         kfree(ses->ntlmssp);
1468         ses->ntlmssp = NULL;
1469         sess_data->result = rc;
1470         sess_data->func = NULL;
1471 }
1472
1473 static void
1474 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1475 {
1476         int rc;
1477         struct cifs_ses *ses = sess_data->ses;
1478         struct smb2_sess_setup_req *req;
1479         struct smb2_sess_setup_rsp *rsp = NULL;
1480         unsigned char *ntlmssp_blob = NULL;
1481         bool use_spnego = false; /* else use raw ntlmssp */
1482         u16 blob_length = 0;
1483
1484         rc = SMB2_sess_alloc_buffer(sess_data);
1485         if (rc)
1486                 goto out;
1487
1488         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1489         req->sync_hdr.SessionId = ses->Suid;
1490
1491         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1492                                         sess_data->nls_cp);
1493         if (rc) {
1494                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1495                 goto out;
1496         }
1497
1498         if (use_spnego) {
1499                 /* BB eventually need to add this */
1500                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1501                 rc = -EOPNOTSUPP;
1502                 goto out;
1503         }
1504         sess_data->iov[1].iov_base = ntlmssp_blob;
1505         sess_data->iov[1].iov_len = blob_length;
1506
1507         rc = SMB2_sess_sendreceive(sess_data);
1508         if (rc)
1509                 goto out;
1510
1511         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1512
1513         /* keep existing ses id and flags if binding */
1514         if (!ses->binding) {
1515                 ses->Suid = rsp->sync_hdr.SessionId;
1516                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1517         }
1518
1519         rc = SMB2_sess_establish_session(sess_data);
1520 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1521         if (ses->server->dialect < SMB30_PROT_ID) {
1522                 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1523                 /*
1524                  * The session id is opaque in terms of endianness, so we can't
1525                  * print it as a long long. we dump it as we got it on the wire
1526                  */
1527                 cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1528                          &ses->Suid);
1529                 cifs_dbg(VFS, "Session Key   %*ph\n",
1530                          SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1531                 cifs_dbg(VFS, "Signing Key   %*ph\n",
1532                          SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1533         }
1534 #endif
1535 out:
1536         kfree(ntlmssp_blob);
1537         SMB2_sess_free_buffer(sess_data);
1538         kfree(ses->ntlmssp);
1539         ses->ntlmssp = NULL;
1540         sess_data->result = rc;
1541         sess_data->func = NULL;
1542 }
1543
1544 static int
1545 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1546 {
1547         int type;
1548
1549         type = smb2_select_sectype(cifs_ses_server(ses), ses->sectype);
1550         cifs_dbg(FYI, "sess setup type %d\n", type);
1551         if (type == Unspecified) {
1552                 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1553                 return -EINVAL;
1554         }
1555
1556         switch (type) {
1557         case Kerberos:
1558                 sess_data->func = SMB2_auth_kerberos;
1559                 break;
1560         case RawNTLMSSP:
1561                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1562                 break;
1563         default:
1564                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1565                 return -EOPNOTSUPP;
1566         }
1567
1568         return 0;
1569 }
1570
1571 int
1572 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1573                 const struct nls_table *nls_cp)
1574 {
1575         int rc = 0;
1576         struct TCP_Server_Info *server = cifs_ses_server(ses);
1577         struct SMB2_sess_data *sess_data;
1578
1579         cifs_dbg(FYI, "Session Setup\n");
1580
1581         if (!server) {
1582                 WARN(1, "%s: server is NULL!\n", __func__);
1583                 return -EIO;
1584         }
1585
1586         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1587         if (!sess_data)
1588                 return -ENOMEM;
1589
1590         rc = SMB2_select_sec(ses, sess_data);
1591         if (rc)
1592                 goto out;
1593         sess_data->xid = xid;
1594         sess_data->ses = ses;
1595         sess_data->buf0_type = CIFS_NO_BUFFER;
1596         sess_data->nls_cp = (struct nls_table *) nls_cp;
1597         sess_data->previous_session = ses->Suid;
1598
1599         /*
1600          * Initialize the session hash with the server one.
1601          */
1602         memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1603                SMB2_PREAUTH_HASH_SIZE);
1604
1605         while (sess_data->func)
1606                 sess_data->func(sess_data);
1607
1608         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1609                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1610         rc = sess_data->result;
1611 out:
1612         kfree(sess_data);
1613         return rc;
1614 }
1615
1616 int
1617 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1618 {
1619         struct smb_rqst rqst;
1620         struct smb2_logoff_req *req; /* response is also trivial struct */
1621         int rc = 0;
1622         struct TCP_Server_Info *server;
1623         int flags = 0;
1624         unsigned int total_len;
1625         struct kvec iov[1];
1626         struct kvec rsp_iov;
1627         int resp_buf_type;
1628
1629         cifs_dbg(FYI, "disconnect session %p\n", ses);
1630
1631         if (ses && (ses->server))
1632                 server = ses->server;
1633         else
1634                 return -EIO;
1635
1636         /* no need to send SMB logoff if uid already closed due to reconnect */
1637         if (ses->need_reconnect)
1638                 goto smb2_session_already_dead;
1639
1640         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1641                                  (void **) &req, &total_len);
1642         if (rc)
1643                 return rc;
1644
1645          /* since no tcon, smb2_init can not do this, so do here */
1646         req->sync_hdr.SessionId = ses->Suid;
1647
1648         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1649                 flags |= CIFS_TRANSFORM_REQ;
1650         else if (server->sign)
1651                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1652
1653         flags |= CIFS_NO_RSP_BUF;
1654
1655         iov[0].iov_base = (char *)req;
1656         iov[0].iov_len = total_len;
1657
1658         memset(&rqst, 0, sizeof(struct smb_rqst));
1659         rqst.rq_iov = iov;
1660         rqst.rq_nvec = 1;
1661
1662         rc = cifs_send_recv(xid, ses, ses->server,
1663                             &rqst, &resp_buf_type, flags, &rsp_iov);
1664         cifs_small_buf_release(req);
1665         /*
1666          * No tcon so can't do
1667          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1668          */
1669
1670 smb2_session_already_dead:
1671         return rc;
1672 }
1673
1674 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1675 {
1676         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1677 }
1678
1679 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1680
1681 /* These are similar values to what Windows uses */
1682 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1683 {
1684         tcon->max_chunks = 256;
1685         tcon->max_bytes_chunk = 1048576;
1686         tcon->max_bytes_copy = 16777216;
1687 }
1688
1689 int
1690 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1691           struct cifs_tcon *tcon, const struct nls_table *cp)
1692 {
1693         struct smb_rqst rqst;
1694         struct smb2_tree_connect_req *req;
1695         struct smb2_tree_connect_rsp *rsp = NULL;
1696         struct kvec iov[2];
1697         struct kvec rsp_iov = { NULL, 0 };
1698         int rc = 0;
1699         int resp_buftype;
1700         int unc_path_len;
1701         __le16 *unc_path = NULL;
1702         int flags = 0;
1703         unsigned int total_len;
1704         struct TCP_Server_Info *server;
1705
1706         /* always use master channel */
1707         server = ses->server;
1708
1709         cifs_dbg(FYI, "TCON\n");
1710
1711         if (!server || !tree)
1712                 return -EIO;
1713
1714         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1715         if (unc_path == NULL)
1716                 return -ENOMEM;
1717
1718         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1719         unc_path_len *= 2;
1720         if (unc_path_len < 2) {
1721                 kfree(unc_path);
1722                 return -EINVAL;
1723         }
1724
1725         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1726         tcon->tid = 0;
1727         atomic_set(&tcon->num_remote_opens, 0);
1728         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
1729                                  (void **) &req, &total_len);
1730         if (rc) {
1731                 kfree(unc_path);
1732                 return rc;
1733         }
1734
1735         if (smb3_encryption_required(tcon))
1736                 flags |= CIFS_TRANSFORM_REQ;
1737
1738         iov[0].iov_base = (char *)req;
1739         /* 1 for pad */
1740         iov[0].iov_len = total_len - 1;
1741
1742         /* Testing shows that buffer offset must be at location of Buffer[0] */
1743         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1744                         - 1 /* pad */);
1745         req->PathLength = cpu_to_le16(unc_path_len - 2);
1746         iov[1].iov_base = unc_path;
1747         iov[1].iov_len = unc_path_len;
1748
1749         /*
1750          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1751          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1752          * (Samba servers don't always set the flag so also check if null user)
1753          */
1754         if ((server->dialect == SMB311_PROT_ID) &&
1755             !smb3_encryption_required(tcon) &&
1756             !(ses->session_flags &
1757                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1758             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1759                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1760
1761         memset(&rqst, 0, sizeof(struct smb_rqst));
1762         rqst.rq_iov = iov;
1763         rqst.rq_nvec = 2;
1764
1765         /* Need 64 for max size write so ask for more in case not there yet */
1766         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1767
1768         rc = cifs_send_recv(xid, ses, server,
1769                             &rqst, &resp_buftype, flags, &rsp_iov);
1770         cifs_small_buf_release(req);
1771         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1772         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1773         if (rc != 0) {
1774                 if (tcon) {
1775                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1776                         tcon->need_reconnect = true;
1777                 }
1778                 goto tcon_error_exit;
1779         }
1780
1781         switch (rsp->ShareType) {
1782         case SMB2_SHARE_TYPE_DISK:
1783                 cifs_dbg(FYI, "connection to disk share\n");
1784                 break;
1785         case SMB2_SHARE_TYPE_PIPE:
1786                 tcon->pipe = true;
1787                 cifs_dbg(FYI, "connection to pipe share\n");
1788                 break;
1789         case SMB2_SHARE_TYPE_PRINT:
1790                 tcon->print = true;
1791                 cifs_dbg(FYI, "connection to printer\n");
1792                 break;
1793         default:
1794                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1795                 rc = -EOPNOTSUPP;
1796                 goto tcon_error_exit;
1797         }
1798
1799         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1800         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1801         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1802         tcon->tidStatus = CifsGood;
1803         tcon->need_reconnect = false;
1804         tcon->tid = rsp->sync_hdr.TreeId;
1805         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1806
1807         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1808             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1809                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1810
1811         if (tcon->seal &&
1812             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1813                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1814
1815         init_copy_chunk_defaults(tcon);
1816         if (server->ops->validate_negotiate)
1817                 rc = server->ops->validate_negotiate(xid, tcon);
1818 tcon_exit:
1819
1820         free_rsp_buf(resp_buftype, rsp);
1821         kfree(unc_path);
1822         return rc;
1823
1824 tcon_error_exit:
1825         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1826                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1827         }
1828         goto tcon_exit;
1829 }
1830
1831 int
1832 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1833 {
1834         struct smb_rqst rqst;
1835         struct smb2_tree_disconnect_req *req; /* response is trivial */
1836         int rc = 0;
1837         struct cifs_ses *ses = tcon->ses;
1838         int flags = 0;
1839         unsigned int total_len;
1840         struct kvec iov[1];
1841         struct kvec rsp_iov;
1842         int resp_buf_type;
1843
1844         cifs_dbg(FYI, "Tree Disconnect\n");
1845
1846         if (!ses || !(ses->server))
1847                 return -EIO;
1848
1849         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1850                 return 0;
1851
1852         close_shroot_lease(&tcon->crfid);
1853
1854         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
1855                                  (void **) &req,
1856                                  &total_len);
1857         if (rc)
1858                 return rc;
1859
1860         if (smb3_encryption_required(tcon))
1861                 flags |= CIFS_TRANSFORM_REQ;
1862
1863         flags |= CIFS_NO_RSP_BUF;
1864
1865         iov[0].iov_base = (char *)req;
1866         iov[0].iov_len = total_len;
1867
1868         memset(&rqst, 0, sizeof(struct smb_rqst));
1869         rqst.rq_iov = iov;
1870         rqst.rq_nvec = 1;
1871
1872         rc = cifs_send_recv(xid, ses, ses->server,
1873                             &rqst, &resp_buf_type, flags, &rsp_iov);
1874         cifs_small_buf_release(req);
1875         if (rc)
1876                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1877
1878         return rc;
1879 }
1880
1881
1882 static struct create_durable *
1883 create_durable_buf(void)
1884 {
1885         struct create_durable *buf;
1886
1887         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1888         if (!buf)
1889                 return NULL;
1890
1891         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1892                                         (struct create_durable, Data));
1893         buf->ccontext.DataLength = cpu_to_le32(16);
1894         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1895                                 (struct create_durable, Name));
1896         buf->ccontext.NameLength = cpu_to_le16(4);
1897         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1898         buf->Name[0] = 'D';
1899         buf->Name[1] = 'H';
1900         buf->Name[2] = 'n';
1901         buf->Name[3] = 'Q';
1902         return buf;
1903 }
1904
1905 static struct create_durable *
1906 create_reconnect_durable_buf(struct cifs_fid *fid)
1907 {
1908         struct create_durable *buf;
1909
1910         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1911         if (!buf)
1912                 return NULL;
1913
1914         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1915                                         (struct create_durable, Data));
1916         buf->ccontext.DataLength = cpu_to_le32(16);
1917         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1918                                 (struct create_durable, Name));
1919         buf->ccontext.NameLength = cpu_to_le16(4);
1920         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1921         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1922         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1923         buf->Name[0] = 'D';
1924         buf->Name[1] = 'H';
1925         buf->Name[2] = 'n';
1926         buf->Name[3] = 'C';
1927         return buf;
1928 }
1929
1930 static void
1931 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
1932 {
1933         struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
1934
1935         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
1936                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
1937         buf->IndexNumber = pdisk_id->DiskFileId;
1938 }
1939
1940 static void
1941 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
1942                  struct create_posix_rsp *posix)
1943 {
1944         int sid_len;
1945         u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
1946         u8 *end = beg + le32_to_cpu(cc->DataLength);
1947         u8 *sid;
1948
1949         memset(posix, 0, sizeof(*posix));
1950
1951         posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
1952         posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
1953         posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
1954
1955         sid = beg + 12;
1956         sid_len = posix_info_sid_size(sid, end);
1957         if (sid_len < 0) {
1958                 cifs_dbg(VFS, "bad owner sid in posix create response\n");
1959                 return;
1960         }
1961         memcpy(&posix->owner, sid, sid_len);
1962
1963         sid = sid + sid_len;
1964         sid_len = posix_info_sid_size(sid, end);
1965         if (sid_len < 0) {
1966                 cifs_dbg(VFS, "bad group sid in posix create response\n");
1967                 return;
1968         }
1969         memcpy(&posix->group, sid, sid_len);
1970
1971         cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
1972                  posix->nlink, posix->mode, posix->reparse_tag);
1973 }
1974
1975 void
1976 smb2_parse_contexts(struct TCP_Server_Info *server,
1977                     struct smb2_create_rsp *rsp,
1978                     unsigned int *epoch, char *lease_key, __u8 *oplock,
1979                     struct smb2_file_all_info *buf,
1980                     struct create_posix_rsp *posix)
1981 {
1982         char *data_offset;
1983         struct create_context *cc;
1984         unsigned int next;
1985         unsigned int remaining;
1986         char *name;
1987         static const char smb3_create_tag_posix[] = {
1988                 0x93, 0xAD, 0x25, 0x50, 0x9C,
1989                 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
1990                 0xDE, 0x96, 0x8B, 0xCD, 0x7C
1991         };
1992
1993         *oplock = 0;
1994         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1995         remaining = le32_to_cpu(rsp->CreateContextsLength);
1996         cc = (struct create_context *)data_offset;
1997
1998         /* Initialize inode number to 0 in case no valid data in qfid context */
1999         if (buf)
2000                 buf->IndexNumber = 0;
2001
2002         while (remaining >= sizeof(struct create_context)) {
2003                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
2004                 if (le16_to_cpu(cc->NameLength) == 4 &&
2005                     strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
2006                         *oplock = server->ops->parse_lease_buf(cc, epoch,
2007                                                            lease_key);
2008                 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
2009                     strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
2010                         parse_query_id_ctxt(cc, buf);
2011                 else if ((le16_to_cpu(cc->NameLength) == 16)) {
2012                         if (posix &&
2013                             memcmp(name, smb3_create_tag_posix, 16) == 0)
2014                                 parse_posix_ctxt(cc, buf, posix);
2015                 }
2016                 /* else {
2017                         cifs_dbg(FYI, "Context not matched with len %d\n",
2018                                 le16_to_cpu(cc->NameLength));
2019                         cifs_dump_mem("Cctxt name: ", name, 4);
2020                 } */
2021
2022                 next = le32_to_cpu(cc->Next);
2023                 if (!next)
2024                         break;
2025                 remaining -= next;
2026                 cc = (struct create_context *)((char *)cc + next);
2027         }
2028
2029         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2030                 *oplock = rsp->OplockLevel;
2031
2032         return;
2033 }
2034
2035 static int
2036 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
2037                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2038 {
2039         struct smb2_create_req *req = iov[0].iov_base;
2040         unsigned int num = *num_iovec;
2041
2042         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2043         if (iov[num].iov_base == NULL)
2044                 return -ENOMEM;
2045         iov[num].iov_len = server->vals->create_lease_size;
2046         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2047         if (!req->CreateContextsOffset)
2048                 req->CreateContextsOffset = cpu_to_le32(
2049                                 sizeof(struct smb2_create_req) +
2050                                 iov[num - 1].iov_len);
2051         le32_add_cpu(&req->CreateContextsLength,
2052                      server->vals->create_lease_size);
2053         *num_iovec = num + 1;
2054         return 0;
2055 }
2056
2057 static struct create_durable_v2 *
2058 create_durable_v2_buf(struct cifs_open_parms *oparms)
2059 {
2060         struct cifs_fid *pfid = oparms->fid;
2061         struct create_durable_v2 *buf;
2062
2063         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2064         if (!buf)
2065                 return NULL;
2066
2067         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2068                                         (struct create_durable_v2, dcontext));
2069         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2070         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2071                                 (struct create_durable_v2, Name));
2072         buf->ccontext.NameLength = cpu_to_le16(4);
2073
2074         /*
2075          * NB: Handle timeout defaults to 0, which allows server to choose
2076          * (most servers default to 120 seconds) and most clients default to 0.
2077          * This can be overridden at mount ("handletimeout=") if the user wants
2078          * a different persistent (or resilient) handle timeout for all opens
2079          * opens on a particular SMB3 mount.
2080          */
2081         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2082         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2083         generate_random_uuid(buf->dcontext.CreateGuid);
2084         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2085
2086         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2087         buf->Name[0] = 'D';
2088         buf->Name[1] = 'H';
2089         buf->Name[2] = '2';
2090         buf->Name[3] = 'Q';
2091         return buf;
2092 }
2093
2094 static struct create_durable_handle_reconnect_v2 *
2095 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2096 {
2097         struct create_durable_handle_reconnect_v2 *buf;
2098
2099         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2100                         GFP_KERNEL);
2101         if (!buf)
2102                 return NULL;
2103
2104         buf->ccontext.DataOffset =
2105                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2106                                      dcontext));
2107         buf->ccontext.DataLength =
2108                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2109         buf->ccontext.NameOffset =
2110                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2111                             Name));
2112         buf->ccontext.NameLength = cpu_to_le16(4);
2113
2114         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2115         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2116         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2117         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2118
2119         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2120         buf->Name[0] = 'D';
2121         buf->Name[1] = 'H';
2122         buf->Name[2] = '2';
2123         buf->Name[3] = 'C';
2124         return buf;
2125 }
2126
2127 static int
2128 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2129                     struct cifs_open_parms *oparms)
2130 {
2131         struct smb2_create_req *req = iov[0].iov_base;
2132         unsigned int num = *num_iovec;
2133
2134         iov[num].iov_base = create_durable_v2_buf(oparms);
2135         if (iov[num].iov_base == NULL)
2136                 return -ENOMEM;
2137         iov[num].iov_len = sizeof(struct create_durable_v2);
2138         if (!req->CreateContextsOffset)
2139                 req->CreateContextsOffset =
2140                         cpu_to_le32(sizeof(struct smb2_create_req) +
2141                                                                 iov[1].iov_len);
2142         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2143         *num_iovec = num + 1;
2144         return 0;
2145 }
2146
2147 static int
2148 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2149                     struct cifs_open_parms *oparms)
2150 {
2151         struct smb2_create_req *req = iov[0].iov_base;
2152         unsigned int num = *num_iovec;
2153
2154         /* indicate that we don't need to relock the file */
2155         oparms->reconnect = false;
2156
2157         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2158         if (iov[num].iov_base == NULL)
2159                 return -ENOMEM;
2160         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2161         if (!req->CreateContextsOffset)
2162                 req->CreateContextsOffset =
2163                         cpu_to_le32(sizeof(struct smb2_create_req) +
2164                                                                 iov[1].iov_len);
2165         le32_add_cpu(&req->CreateContextsLength,
2166                         sizeof(struct create_durable_handle_reconnect_v2));
2167         *num_iovec = num + 1;
2168         return 0;
2169 }
2170
2171 static int
2172 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2173                     struct cifs_open_parms *oparms, bool use_persistent)
2174 {
2175         struct smb2_create_req *req = iov[0].iov_base;
2176         unsigned int num = *num_iovec;
2177
2178         if (use_persistent) {
2179                 if (oparms->reconnect)
2180                         return add_durable_reconnect_v2_context(iov, num_iovec,
2181                                                                 oparms);
2182                 else
2183                         return add_durable_v2_context(iov, num_iovec, oparms);
2184         }
2185
2186         if (oparms->reconnect) {
2187                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2188                 /* indicate that we don't need to relock the file */
2189                 oparms->reconnect = false;
2190         } else
2191                 iov[num].iov_base = create_durable_buf();
2192         if (iov[num].iov_base == NULL)
2193                 return -ENOMEM;
2194         iov[num].iov_len = sizeof(struct create_durable);
2195         if (!req->CreateContextsOffset)
2196                 req->CreateContextsOffset =
2197                         cpu_to_le32(sizeof(struct smb2_create_req) +
2198                                                                 iov[1].iov_len);
2199         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2200         *num_iovec = num + 1;
2201         return 0;
2202 }
2203
2204 /* See MS-SMB2 2.2.13.2.7 */
2205 static struct crt_twarp_ctxt *
2206 create_twarp_buf(__u64 timewarp)
2207 {
2208         struct crt_twarp_ctxt *buf;
2209
2210         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2211         if (!buf)
2212                 return NULL;
2213
2214         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2215                                         (struct crt_twarp_ctxt, Timestamp));
2216         buf->ccontext.DataLength = cpu_to_le32(8);
2217         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2218                                 (struct crt_twarp_ctxt, Name));
2219         buf->ccontext.NameLength = cpu_to_le16(4);
2220         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2221         buf->Name[0] = 'T';
2222         buf->Name[1] = 'W';
2223         buf->Name[2] = 'r';
2224         buf->Name[3] = 'p';
2225         buf->Timestamp = cpu_to_le64(timewarp);
2226         return buf;
2227 }
2228
2229 /* See MS-SMB2 2.2.13.2.7 */
2230 static int
2231 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2232 {
2233         struct smb2_create_req *req = iov[0].iov_base;
2234         unsigned int num = *num_iovec;
2235
2236         iov[num].iov_base = create_twarp_buf(timewarp);
2237         if (iov[num].iov_base == NULL)
2238                 return -ENOMEM;
2239         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2240         if (!req->CreateContextsOffset)
2241                 req->CreateContextsOffset = cpu_to_le32(
2242                                 sizeof(struct smb2_create_req) +
2243                                 iov[num - 1].iov_len);
2244         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2245         *num_iovec = num + 1;
2246         return 0;
2247 }
2248
2249 /* See See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2250 static void setup_owner_group_sids(char *buf)
2251 {
2252         struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2253
2254         /* Populate the user ownership fields S-1-5-88-1 */
2255         sids->owner.Revision = 1;
2256         sids->owner.NumAuth = 3;
2257         sids->owner.Authority[5] = 5;
2258         sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2259         sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2260         sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2261
2262         /* Populate the group ownership fields S-1-5-88-2 */
2263         sids->group.Revision = 1;
2264         sids->group.NumAuth = 3;
2265         sids->group.Authority[5] = 5;
2266         sids->group.SubAuthorities[0] = cpu_to_le32(88);
2267         sids->group.SubAuthorities[1] = cpu_to_le32(2);
2268         sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2269
2270         cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2271 }
2272
2273 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2274 static struct crt_sd_ctxt *
2275 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2276 {
2277         struct crt_sd_ctxt *buf;
2278         __u8 *ptr, *aclptr;
2279         unsigned int acelen, acl_size, ace_count;
2280         unsigned int owner_offset = 0;
2281         unsigned int group_offset = 0;
2282         struct smb3_acl acl;
2283
2284         *len = roundup(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
2285
2286         if (set_owner) {
2287                 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2288                 *len += sizeof(struct owner_group_sids);
2289         }
2290
2291         buf = kzalloc(*len, GFP_KERNEL);
2292         if (buf == NULL)
2293                 return buf;
2294
2295         ptr = (__u8 *)&buf[1];
2296         if (set_owner) {
2297                 /* offset fields are from beginning of security descriptor not of create context */
2298                 owner_offset = ptr - (__u8 *)&buf->sd;
2299                 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2300                 group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2301                 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2302
2303                 setup_owner_group_sids(ptr);
2304                 ptr += sizeof(struct owner_group_sids);
2305         } else {
2306                 buf->sd.OffsetOwner = 0;
2307                 buf->sd.OffsetGroup = 0;
2308         }
2309
2310         buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2311         buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2312         buf->ccontext.NameLength = cpu_to_le16(4);
2313         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2314         buf->Name[0] = 'S';
2315         buf->Name[1] = 'e';
2316         buf->Name[2] = 'c';
2317         buf->Name[3] = 'D';
2318         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2319
2320         /*
2321          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2322          * and "DP" ie the DACL is present
2323          */
2324         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2325
2326         /* offset owner, group and Sbz1 and SACL are all zero */
2327         buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2328         /* Ship the ACL for now. we will copy it into buf later. */
2329         aclptr = ptr;
2330         ptr += sizeof(struct cifs_acl);
2331
2332         /* create one ACE to hold the mode embedded in reserved special SID */
2333         acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode);
2334         ptr += acelen;
2335         acl_size = acelen + sizeof(struct smb3_acl);
2336         ace_count = 1;
2337
2338         if (set_owner) {
2339                 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2340                 acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr);
2341                 ptr += acelen;
2342                 acl_size += acelen;
2343                 ace_count += 1;
2344         }
2345
2346         /* and one more ACE to allow access for authenticated users */
2347         acelen = setup_authusers_ACE((struct cifs_ace *)ptr);
2348         ptr += acelen;
2349         acl_size += acelen;
2350         ace_count += 1;
2351
2352         acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2353         acl.AclSize = cpu_to_le16(acl_size);
2354         acl.AceCount = cpu_to_le16(ace_count);
2355         memcpy(aclptr, &acl, sizeof(struct cifs_acl));
2356
2357         buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2358         *len = ptr - (__u8 *)buf;
2359
2360         return buf;
2361 }
2362
2363 static int
2364 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2365 {
2366         struct smb2_create_req *req = iov[0].iov_base;
2367         unsigned int num = *num_iovec;
2368         unsigned int len = 0;
2369
2370         iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2371         if (iov[num].iov_base == NULL)
2372                 return -ENOMEM;
2373         iov[num].iov_len = len;
2374         if (!req->CreateContextsOffset)
2375                 req->CreateContextsOffset = cpu_to_le32(
2376                                 sizeof(struct smb2_create_req) +
2377                                 iov[num - 1].iov_len);
2378         le32_add_cpu(&req->CreateContextsLength, len);
2379         *num_iovec = num + 1;
2380         return 0;
2381 }
2382
2383 static struct crt_query_id_ctxt *
2384 create_query_id_buf(void)
2385 {
2386         struct crt_query_id_ctxt *buf;
2387
2388         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2389         if (!buf)
2390                 return NULL;
2391
2392         buf->ccontext.DataOffset = cpu_to_le16(0);
2393         buf->ccontext.DataLength = cpu_to_le32(0);
2394         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2395                                 (struct crt_query_id_ctxt, Name));
2396         buf->ccontext.NameLength = cpu_to_le16(4);
2397         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2398         buf->Name[0] = 'Q';
2399         buf->Name[1] = 'F';
2400         buf->Name[2] = 'i';
2401         buf->Name[3] = 'd';
2402         return buf;
2403 }
2404
2405 /* See MS-SMB2 2.2.13.2.9 */
2406 static int
2407 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2408 {
2409         struct smb2_create_req *req = iov[0].iov_base;
2410         unsigned int num = *num_iovec;
2411
2412         iov[num].iov_base = create_query_id_buf();
2413         if (iov[num].iov_base == NULL)
2414                 return -ENOMEM;
2415         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2416         if (!req->CreateContextsOffset)
2417                 req->CreateContextsOffset = cpu_to_le32(
2418                                 sizeof(struct smb2_create_req) +
2419                                 iov[num - 1].iov_len);
2420         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2421         *num_iovec = num + 1;
2422         return 0;
2423 }
2424
2425 static int
2426 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2427                             const char *treename, const __le16 *path)
2428 {
2429         int treename_len, path_len;
2430         struct nls_table *cp;
2431         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2432
2433         /*
2434          * skip leading "\\"
2435          */
2436         treename_len = strlen(treename);
2437         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2438                 return -EINVAL;
2439
2440         treename += 2;
2441         treename_len -= 2;
2442
2443         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2444
2445         /*
2446          * make room for one path separator between the treename and
2447          * path
2448          */
2449         *out_len = treename_len + 1 + path_len;
2450
2451         /*
2452          * final path needs to be null-terminated UTF16 with a
2453          * size aligned to 8
2454          */
2455
2456         *out_size = roundup((*out_len+1)*2, 8);
2457         *out_path = kzalloc(*out_size, GFP_KERNEL);
2458         if (!*out_path)
2459                 return -ENOMEM;
2460
2461         cp = load_nls_default();
2462         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2463         UniStrcat(*out_path, sep);
2464         UniStrcat(*out_path, path);
2465         unload_nls(cp);
2466
2467         return 0;
2468 }
2469
2470 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2471                                umode_t mode, struct cifs_tcon *tcon,
2472                                const char *full_path,
2473                                struct cifs_sb_info *cifs_sb)
2474 {
2475         struct smb_rqst rqst;
2476         struct smb2_create_req *req;
2477         struct smb2_create_rsp *rsp = NULL;
2478         struct cifs_ses *ses = tcon->ses;
2479         struct kvec iov[3]; /* make sure at least one for each open context */
2480         struct kvec rsp_iov = {NULL, 0};
2481         int resp_buftype;
2482         int uni_path_len;
2483         __le16 *copy_path = NULL;
2484         int copy_size;
2485         int rc = 0;
2486         unsigned int n_iov = 2;
2487         __u32 file_attributes = 0;
2488         char *pc_buf = NULL;
2489         int flags = 0;
2490         unsigned int total_len;
2491         __le16 *utf16_path = NULL;
2492         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2493
2494         cifs_dbg(FYI, "mkdir\n");
2495
2496         /* resource #1: path allocation */
2497         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2498         if (!utf16_path)
2499                 return -ENOMEM;
2500
2501         if (!ses || !server) {
2502                 rc = -EIO;
2503                 goto err_free_path;
2504         }
2505
2506         /* resource #2: request */
2507         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2508                                  (void **) &req, &total_len);
2509         if (rc)
2510                 goto err_free_path;
2511
2512
2513         if (smb3_encryption_required(tcon))
2514                 flags |= CIFS_TRANSFORM_REQ;
2515
2516         req->ImpersonationLevel = IL_IMPERSONATION;
2517         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2518         /* File attributes ignored on open (used in create though) */
2519         req->FileAttributes = cpu_to_le32(file_attributes);
2520         req->ShareAccess = FILE_SHARE_ALL_LE;
2521         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2522         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2523
2524         iov[0].iov_base = (char *)req;
2525         /* -1 since last byte is buf[0] which is sent below (path) */
2526         iov[0].iov_len = total_len - 1;
2527
2528         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2529
2530         /* [MS-SMB2] 2.2.13 NameOffset:
2531          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2532          * the SMB2 header, the file name includes a prefix that will
2533          * be processed during DFS name normalization as specified in
2534          * section 3.3.5.9. Otherwise, the file name is relative to
2535          * the share that is identified by the TreeId in the SMB2
2536          * header.
2537          */
2538         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2539                 int name_len;
2540
2541                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2542                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2543                                                  &name_len,
2544                                                  tcon->treeName, utf16_path);
2545                 if (rc)
2546                         goto err_free_req;
2547
2548                 req->NameLength = cpu_to_le16(name_len * 2);
2549                 uni_path_len = copy_size;
2550                 /* free before overwriting resource */
2551                 kfree(utf16_path);
2552                 utf16_path = copy_path;
2553         } else {
2554                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2555                 /* MUST set path len (NameLength) to 0 opening root of share */
2556                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2557                 if (uni_path_len % 8 != 0) {
2558                         copy_size = roundup(uni_path_len, 8);
2559                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2560                         if (!copy_path) {
2561                                 rc = -ENOMEM;
2562                                 goto err_free_req;
2563                         }
2564                         memcpy((char *)copy_path, (const char *)utf16_path,
2565                                uni_path_len);
2566                         uni_path_len = copy_size;
2567                         /* free before overwriting resource */
2568                         kfree(utf16_path);
2569                         utf16_path = copy_path;
2570                 }
2571         }
2572
2573         iov[1].iov_len = uni_path_len;
2574         iov[1].iov_base = utf16_path;
2575         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2576
2577         if (tcon->posix_extensions) {
2578                 /* resource #3: posix buf */
2579                 rc = add_posix_context(iov, &n_iov, mode);
2580                 if (rc)
2581                         goto err_free_req;
2582                 pc_buf = iov[n_iov-1].iov_base;
2583         }
2584
2585
2586         memset(&rqst, 0, sizeof(struct smb_rqst));
2587         rqst.rq_iov = iov;
2588         rqst.rq_nvec = n_iov;
2589
2590         /* no need to inc num_remote_opens because we close it just below */
2591         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2592                                     FILE_WRITE_ATTRIBUTES);
2593         /* resource #4: response buffer */
2594         rc = cifs_send_recv(xid, ses, server,
2595                             &rqst, &resp_buftype, flags, &rsp_iov);
2596         if (rc) {
2597                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2598                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2599                                            CREATE_NOT_FILE,
2600                                            FILE_WRITE_ATTRIBUTES, rc);
2601                 goto err_free_rsp_buf;
2602         }
2603
2604         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2605         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2606                                     ses->Suid, CREATE_NOT_FILE,
2607                                     FILE_WRITE_ATTRIBUTES);
2608
2609         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2610
2611         /* Eventually save off posix specific response info and timestaps */
2612
2613 err_free_rsp_buf:
2614         free_rsp_buf(resp_buftype, rsp);
2615         kfree(pc_buf);
2616 err_free_req:
2617         cifs_small_buf_release(req);
2618 err_free_path:
2619         kfree(utf16_path);
2620         return rc;
2621 }
2622
2623 int
2624 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2625                struct smb_rqst *rqst, __u8 *oplock,
2626                struct cifs_open_parms *oparms, __le16 *path)
2627 {
2628         struct smb2_create_req *req;
2629         unsigned int n_iov = 2;
2630         __u32 file_attributes = 0;
2631         int copy_size;
2632         int uni_path_len;
2633         unsigned int total_len;
2634         struct kvec *iov = rqst->rq_iov;
2635         __le16 *copy_path;
2636         int rc;
2637
2638         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2639                                  (void **) &req, &total_len);
2640         if (rc)
2641                 return rc;
2642
2643         iov[0].iov_base = (char *)req;
2644         /* -1 since last byte is buf[0] which is sent below (path) */
2645         iov[0].iov_len = total_len - 1;
2646
2647         if (oparms->create_options & CREATE_OPTION_READONLY)
2648                 file_attributes |= ATTR_READONLY;
2649         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2650                 file_attributes |= ATTR_SYSTEM;
2651
2652         req->ImpersonationLevel = IL_IMPERSONATION;
2653         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2654         /* File attributes ignored on open (used in create though) */
2655         req->FileAttributes = cpu_to_le32(file_attributes);
2656         req->ShareAccess = FILE_SHARE_ALL_LE;
2657
2658         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2659         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2660         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2661
2662         /* [MS-SMB2] 2.2.13 NameOffset:
2663          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2664          * the SMB2 header, the file name includes a prefix that will
2665          * be processed during DFS name normalization as specified in
2666          * section 3.3.5.9. Otherwise, the file name is relative to
2667          * the share that is identified by the TreeId in the SMB2
2668          * header.
2669          */
2670         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2671                 int name_len;
2672
2673                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2674                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2675                                                  &name_len,
2676                                                  tcon->treeName, path);
2677                 if (rc)
2678                         return rc;
2679                 req->NameLength = cpu_to_le16(name_len * 2);
2680                 uni_path_len = copy_size;
2681                 path = copy_path;
2682         } else {
2683                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2684                 /* MUST set path len (NameLength) to 0 opening root of share */
2685                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2686                 copy_size = uni_path_len;
2687                 if (copy_size % 8 != 0)
2688                         copy_size = roundup(copy_size, 8);
2689                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2690                 if (!copy_path)
2691                         return -ENOMEM;
2692                 memcpy((char *)copy_path, (const char *)path,
2693                        uni_path_len);
2694                 uni_path_len = copy_size;
2695                 path = copy_path;
2696         }
2697
2698         iov[1].iov_len = uni_path_len;
2699         iov[1].iov_base = path;
2700
2701         if ((!server->oplocks) || (tcon->no_lease))
2702                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2703
2704         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2705             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2706                 req->RequestedOplockLevel = *oplock;
2707         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2708                   (oparms->create_options & CREATE_NOT_FILE))
2709                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2710         else {
2711                 rc = add_lease_context(server, iov, &n_iov,
2712                                        oparms->fid->lease_key, oplock);
2713                 if (rc)
2714                         return rc;
2715         }
2716
2717         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2718                 /* need to set Next field of lease context if we request it */
2719                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2720                         struct create_context *ccontext =
2721                             (struct create_context *)iov[n_iov-1].iov_base;
2722                         ccontext->Next =
2723                                 cpu_to_le32(server->vals->create_lease_size);
2724                 }
2725
2726                 rc = add_durable_context(iov, &n_iov, oparms,
2727                                         tcon->use_persistent);
2728                 if (rc)
2729                         return rc;
2730         }
2731
2732         if (tcon->posix_extensions) {
2733                 if (n_iov > 2) {
2734                         struct create_context *ccontext =
2735                             (struct create_context *)iov[n_iov-1].iov_base;
2736                         ccontext->Next =
2737                                 cpu_to_le32(iov[n_iov-1].iov_len);
2738                 }
2739
2740                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2741                 if (rc)
2742                         return rc;
2743         }
2744
2745         if (tcon->snapshot_time) {
2746                 cifs_dbg(FYI, "adding snapshot context\n");
2747                 if (n_iov > 2) {
2748                         struct create_context *ccontext =
2749                             (struct create_context *)iov[n_iov-1].iov_base;
2750                         ccontext->Next =
2751                                 cpu_to_le32(iov[n_iov-1].iov_len);
2752                 }
2753
2754                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2755                 if (rc)
2756                         return rc;
2757         }
2758
2759         if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
2760                 bool set_mode;
2761                 bool set_owner;
2762
2763                 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2764                     (oparms->mode != ACL_NO_MODE))
2765                         set_mode = true;
2766                 else {
2767                         set_mode = false;
2768                         oparms->mode = ACL_NO_MODE;
2769                 }
2770
2771                 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
2772                         set_owner = true;
2773                 else
2774                         set_owner = false;
2775
2776                 if (set_owner | set_mode) {
2777                         if (n_iov > 2) {
2778                                 struct create_context *ccontext =
2779                                     (struct create_context *)iov[n_iov-1].iov_base;
2780                                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2781                         }
2782
2783                         cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2784                         rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
2785                         if (rc)
2786                                 return rc;
2787                 }
2788         }
2789
2790         if (n_iov > 2) {
2791                 struct create_context *ccontext =
2792                         (struct create_context *)iov[n_iov-1].iov_base;
2793                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2794         }
2795         add_query_id_context(iov, &n_iov);
2796
2797         rqst->rq_nvec = n_iov;
2798         return 0;
2799 }
2800
2801 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2802  * All other vectors are freed by kfree().
2803  */
2804 void
2805 SMB2_open_free(struct smb_rqst *rqst)
2806 {
2807         int i;
2808
2809         if (rqst && rqst->rq_iov) {
2810                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2811                 for (i = 1; i < rqst->rq_nvec; i++)
2812                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2813                                 kfree(rqst->rq_iov[i].iov_base);
2814         }
2815 }
2816
2817 int
2818 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2819           __u8 *oplock, struct smb2_file_all_info *buf,
2820           struct create_posix_rsp *posix,
2821           struct kvec *err_iov, int *buftype)
2822 {
2823         struct smb_rqst rqst;
2824         struct smb2_create_rsp *rsp = NULL;
2825         struct cifs_tcon *tcon = oparms->tcon;
2826         struct cifs_ses *ses = tcon->ses;
2827         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2828         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2829         struct kvec rsp_iov = {NULL, 0};
2830         int resp_buftype = CIFS_NO_BUFFER;
2831         int rc = 0;
2832         int flags = 0;
2833
2834         cifs_dbg(FYI, "create/open\n");
2835         if (!ses || !server)
2836                 return -EIO;
2837
2838         if (smb3_encryption_required(tcon))
2839                 flags |= CIFS_TRANSFORM_REQ;
2840
2841         memset(&rqst, 0, sizeof(struct smb_rqst));
2842         memset(&iov, 0, sizeof(iov));
2843         rqst.rq_iov = iov;
2844         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2845
2846         rc = SMB2_open_init(tcon, server,
2847                             &rqst, oplock, oparms, path);
2848         if (rc)
2849                 goto creat_exit;
2850
2851         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2852                 oparms->create_options, oparms->desired_access);
2853
2854         rc = cifs_send_recv(xid, ses, server,
2855                             &rqst, &resp_buftype, flags,
2856                             &rsp_iov);
2857         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2858
2859         if (rc != 0) {
2860                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2861                 if (err_iov && rsp) {
2862                         *err_iov = rsp_iov;
2863                         *buftype = resp_buftype;
2864                         resp_buftype = CIFS_NO_BUFFER;
2865                         rsp = NULL;
2866                 }
2867                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2868                                     oparms->create_options, oparms->desired_access, rc);
2869                 if (rc == -EREMCHG) {
2870                         pr_warn_once("server share %s deleted\n",
2871                                      tcon->treeName);
2872                         tcon->need_reconnect = true;
2873                 }
2874                 goto creat_exit;
2875         } else
2876                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2877                                      ses->Suid, oparms->create_options,
2878                                      oparms->desired_access);
2879
2880         atomic_inc(&tcon->num_remote_opens);
2881         oparms->fid->persistent_fid = rsp->PersistentFileId;
2882         oparms->fid->volatile_fid = rsp->VolatileFileId;
2883         oparms->fid->access = oparms->desired_access;
2884 #ifdef CONFIG_CIFS_DEBUG2
2885         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2886 #endif /* CIFS_DEBUG2 */
2887
2888         if (buf) {
2889                 memcpy(buf, &rsp->CreationTime, 32);
2890                 buf->AllocationSize = rsp->AllocationSize;
2891                 buf->EndOfFile = rsp->EndofFile;
2892                 buf->Attributes = rsp->FileAttributes;
2893                 buf->NumberOfLinks = cpu_to_le32(1);
2894                 buf->DeletePending = 0;
2895         }
2896
2897
2898         smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
2899                             oparms->fid->lease_key, oplock, buf, posix);
2900 creat_exit:
2901         SMB2_open_free(&rqst);
2902         free_rsp_buf(resp_buftype, rsp);
2903         return rc;
2904 }
2905
2906 int
2907 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2908                 struct smb_rqst *rqst,
2909                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2910                 bool is_fsctl, char *in_data, u32 indatalen,
2911                 __u32 max_response_size)
2912 {
2913         struct smb2_ioctl_req *req;
2914         struct kvec *iov = rqst->rq_iov;
2915         unsigned int total_len;
2916         int rc;
2917         char *in_data_buf;
2918
2919         rc = smb2_ioctl_req_init(opcode, tcon, server,
2920                                  (void **) &req, &total_len);
2921         if (rc)
2922                 return rc;
2923
2924         if (indatalen) {
2925                 /*
2926                  * indatalen is usually small at a couple of bytes max, so
2927                  * just allocate through generic pool
2928                  */
2929                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
2930                 if (!in_data_buf) {
2931                         cifs_small_buf_release(req);
2932                         return -ENOMEM;
2933                 }
2934         }
2935
2936         req->CtlCode = cpu_to_le32(opcode);
2937         req->PersistentFileId = persistent_fid;
2938         req->VolatileFileId = volatile_fid;
2939
2940         iov[0].iov_base = (char *)req;
2941         /*
2942          * If no input data, the size of ioctl struct in
2943          * protocol spec still includes a 1 byte data buffer,
2944          * but if input data passed to ioctl, we do not
2945          * want to double count this, so we do not send
2946          * the dummy one byte of data in iovec[0] if sending
2947          * input data (in iovec[1]).
2948          */
2949         if (indatalen) {
2950                 req->InputCount = cpu_to_le32(indatalen);
2951                 /* do not set InputOffset if no input data */
2952                 req->InputOffset =
2953                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2954                 rqst->rq_nvec = 2;
2955                 iov[0].iov_len = total_len - 1;
2956                 iov[1].iov_base = in_data_buf;
2957                 iov[1].iov_len = indatalen;
2958         } else {
2959                 rqst->rq_nvec = 1;
2960                 iov[0].iov_len = total_len;
2961         }
2962
2963         req->OutputOffset = 0;
2964         req->OutputCount = 0; /* MBZ */
2965
2966         /*
2967          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
2968          * We Could increase default MaxOutputResponse, but that could require
2969          * more credits. Windows typically sets this smaller, but for some
2970          * ioctls it may be useful to allow server to send more. No point
2971          * limiting what the server can send as long as fits in one credit
2972          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
2973          * to increase this limit up in the future.
2974          * Note that for snapshot queries that servers like Azure expect that
2975          * the first query be minimal size (and just used to get the number/size
2976          * of previous versions) so response size must be specified as EXACTLY
2977          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2978          * of eight bytes.  Currently that is the only case where we set max
2979          * response size smaller.
2980          */
2981         req->MaxOutputResponse = cpu_to_le32(max_response_size);
2982         req->sync_hdr.CreditCharge =
2983                 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
2984                                          SMB2_MAX_BUFFER_SIZE));
2985         if (is_fsctl)
2986                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2987         else
2988                 req->Flags = 0;
2989
2990         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2991         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2992                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2993
2994         return 0;
2995 }
2996
2997 void
2998 SMB2_ioctl_free(struct smb_rqst *rqst)
2999 {
3000         int i;
3001         if (rqst && rqst->rq_iov) {
3002                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3003                 for (i = 1; i < rqst->rq_nvec; i++)
3004                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3005                                 kfree(rqst->rq_iov[i].iov_base);
3006         }
3007 }
3008
3009
3010 /*
3011  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
3012  */
3013 int
3014 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3015            u64 volatile_fid, u32 opcode, bool is_fsctl,
3016            char *in_data, u32 indatalen, u32 max_out_data_len,
3017            char **out_data, u32 *plen /* returned data len */)
3018 {
3019         struct smb_rqst rqst;
3020         struct smb2_ioctl_rsp *rsp = NULL;
3021         struct cifs_ses *ses;
3022         struct TCP_Server_Info *server;
3023         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3024         struct kvec rsp_iov = {NULL, 0};
3025         int resp_buftype = CIFS_NO_BUFFER;
3026         int rc = 0;
3027         int flags = 0;
3028
3029         cifs_dbg(FYI, "SMB2 IOCTL\n");
3030
3031         if (out_data != NULL)
3032                 *out_data = NULL;
3033
3034         /* zero out returned data len, in case of error */
3035         if (plen)
3036                 *plen = 0;
3037
3038         if (!tcon)
3039                 return -EIO;
3040
3041         ses = tcon->ses;
3042         if (!ses)
3043                 return -EIO;
3044
3045         server = cifs_pick_channel(ses);
3046         if (!server)
3047                 return -EIO;
3048
3049         if (smb3_encryption_required(tcon))
3050                 flags |= CIFS_TRANSFORM_REQ;
3051
3052         memset(&rqst, 0, sizeof(struct smb_rqst));
3053         memset(&iov, 0, sizeof(iov));
3054         rqst.rq_iov = iov;
3055         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3056
3057         rc = SMB2_ioctl_init(tcon, server,
3058                              &rqst, persistent_fid, volatile_fid, opcode,
3059                              is_fsctl, in_data, indatalen, max_out_data_len);
3060         if (rc)
3061                 goto ioctl_exit;
3062
3063         rc = cifs_send_recv(xid, ses, server,
3064                             &rqst, &resp_buftype, flags,
3065                             &rsp_iov);
3066         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3067
3068         if (rc != 0)
3069                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3070                                 ses->Suid, 0, opcode, rc);
3071
3072         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3073                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3074                 goto ioctl_exit;
3075         } else if (rc == -EINVAL) {
3076                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3077                     (opcode != FSCTL_SRV_COPYCHUNK)) {
3078                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3079                         goto ioctl_exit;
3080                 }
3081         } else if (rc == -E2BIG) {
3082                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3083                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3084                         goto ioctl_exit;
3085                 }
3086         }
3087
3088         /* check if caller wants to look at return data or just return rc */
3089         if ((plen == NULL) || (out_data == NULL))
3090                 goto ioctl_exit;
3091
3092         *plen = le32_to_cpu(rsp->OutputCount);
3093
3094         /* We check for obvious errors in the output buffer length and offset */
3095         if (*plen == 0)
3096                 goto ioctl_exit; /* server returned no data */
3097         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3098                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3099                 *plen = 0;
3100                 rc = -EIO;
3101                 goto ioctl_exit;
3102         }
3103
3104         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3105                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3106                         le32_to_cpu(rsp->OutputOffset));
3107                 *plen = 0;
3108                 rc = -EIO;
3109                 goto ioctl_exit;
3110         }
3111
3112         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3113                             *plen, GFP_KERNEL);
3114         if (*out_data == NULL) {
3115                 rc = -ENOMEM;
3116                 goto ioctl_exit;
3117         }
3118
3119 ioctl_exit:
3120         SMB2_ioctl_free(&rqst);
3121         free_rsp_buf(resp_buftype, rsp);
3122         return rc;
3123 }
3124
3125 /*
3126  *   Individual callers to ioctl worker function follow
3127  */
3128
3129 int
3130 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3131                      u64 persistent_fid, u64 volatile_fid)
3132 {
3133         int rc;
3134         struct  compress_ioctl fsctl_input;
3135         char *ret_data = NULL;
3136
3137         fsctl_input.CompressionState =
3138                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3139
3140         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3141                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
3142                         (char *)&fsctl_input /* data input */,
3143                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3144                         &ret_data /* out data */, NULL);
3145
3146         cifs_dbg(FYI, "set compression rc %d\n", rc);
3147
3148         return rc;
3149 }
3150
3151 int
3152 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3153                 struct smb_rqst *rqst,
3154                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3155 {
3156         struct smb2_close_req *req;
3157         struct kvec *iov = rqst->rq_iov;
3158         unsigned int total_len;
3159         int rc;
3160
3161         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3162                                  (void **) &req, &total_len);
3163         if (rc)
3164                 return rc;
3165
3166         req->PersistentFileId = persistent_fid;
3167         req->VolatileFileId = volatile_fid;
3168         if (query_attrs)
3169                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3170         else
3171                 req->Flags = 0;
3172         iov[0].iov_base = (char *)req;
3173         iov[0].iov_len = total_len;
3174
3175         return 0;
3176 }
3177
3178 void
3179 SMB2_close_free(struct smb_rqst *rqst)
3180 {
3181         if (rqst && rqst->rq_iov)
3182                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3183 }
3184
3185 int
3186 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3187              u64 persistent_fid, u64 volatile_fid,
3188              struct smb2_file_network_open_info *pbuf)
3189 {
3190         struct smb_rqst rqst;
3191         struct smb2_close_rsp *rsp = NULL;
3192         struct cifs_ses *ses = tcon->ses;
3193         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3194         struct kvec iov[1];
3195         struct kvec rsp_iov;
3196         int resp_buftype = CIFS_NO_BUFFER;
3197         int rc = 0;
3198         int flags = 0;
3199         bool query_attrs = false;
3200
3201         cifs_dbg(FYI, "Close\n");
3202
3203         if (!ses || !server)
3204                 return -EIO;
3205
3206         if (smb3_encryption_required(tcon))
3207                 flags |= CIFS_TRANSFORM_REQ;
3208
3209         memset(&rqst, 0, sizeof(struct smb_rqst));
3210         memset(&iov, 0, sizeof(iov));
3211         rqst.rq_iov = iov;
3212         rqst.rq_nvec = 1;
3213
3214         /* check if need to ask server to return timestamps in close response */
3215         if (pbuf)
3216                 query_attrs = true;
3217
3218         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3219         rc = SMB2_close_init(tcon, server,
3220                              &rqst, persistent_fid, volatile_fid,
3221                              query_attrs);
3222         if (rc)
3223                 goto close_exit;
3224
3225         rc = cifs_send_recv(xid, ses, server,
3226                             &rqst, &resp_buftype, flags, &rsp_iov);
3227         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3228
3229         if (rc != 0) {
3230                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3231                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3232                                      rc);
3233                 goto close_exit;
3234         } else {
3235                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3236                                       ses->Suid);
3237                 /*
3238                  * Note that have to subtract 4 since struct network_open_info
3239                  * has a final 4 byte pad that close response does not have
3240                  */
3241                 if (pbuf)
3242                         memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3243         }
3244
3245         atomic_dec(&tcon->num_remote_opens);
3246 close_exit:
3247         SMB2_close_free(&rqst);
3248         free_rsp_buf(resp_buftype, rsp);
3249
3250         /* retry close in a worker thread if this one is interrupted */
3251         if (rc == -EINTR) {
3252                 int tmp_rc;
3253
3254                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3255                                                      volatile_fid);
3256                 if (tmp_rc)
3257                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3258                                  persistent_fid, tmp_rc);
3259         }
3260         return rc;
3261 }
3262
3263 int
3264 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3265                 u64 persistent_fid, u64 volatile_fid)
3266 {
3267         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3268 }
3269
3270 int
3271 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3272                   struct kvec *iov, unsigned int min_buf_size)
3273 {
3274         unsigned int smb_len = iov->iov_len;
3275         char *end_of_smb = smb_len + (char *)iov->iov_base;
3276         char *begin_of_buf = offset + (char *)iov->iov_base;
3277         char *end_of_buf = begin_of_buf + buffer_length;
3278
3279
3280         if (buffer_length < min_buf_size) {
3281                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3282                          buffer_length, min_buf_size);
3283                 return -EINVAL;
3284         }
3285
3286         /* check if beyond RFC1001 maximum length */
3287         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3288                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3289                          buffer_length, smb_len);
3290                 return -EINVAL;
3291         }
3292
3293         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3294                 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3295                 return -EINVAL;
3296         }
3297
3298         return 0;
3299 }
3300
3301 /*
3302  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3303  * Caller must free buffer.
3304  */
3305 int
3306 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3307                            struct kvec *iov, unsigned int minbufsize,
3308                            char *data)
3309 {
3310         char *begin_of_buf = offset + (char *)iov->iov_base;
3311         int rc;
3312
3313         if (!data)
3314                 return -EINVAL;
3315
3316         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3317         if (rc)
3318                 return rc;
3319
3320         memcpy(data, begin_of_buf, buffer_length);
3321
3322         return 0;
3323 }
3324
3325 int
3326 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3327                      struct smb_rqst *rqst,
3328                      u64 persistent_fid, u64 volatile_fid,
3329                      u8 info_class, u8 info_type, u32 additional_info,
3330                      size_t output_len, size_t input_len, void *input)
3331 {
3332         struct smb2_query_info_req *req;
3333         struct kvec *iov = rqst->rq_iov;
3334         unsigned int total_len;
3335         int rc;
3336
3337         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3338                                  (void **) &req, &total_len);
3339         if (rc)
3340                 return rc;
3341
3342         req->InfoType = info_type;
3343         req->FileInfoClass = info_class;
3344         req->PersistentFileId = persistent_fid;
3345         req->VolatileFileId = volatile_fid;
3346         req->AdditionalInformation = cpu_to_le32(additional_info);
3347
3348         req->OutputBufferLength = cpu_to_le32(output_len);
3349         if (input_len) {
3350                 req->InputBufferLength = cpu_to_le32(input_len);
3351                 /* total_len for smb query request never close to le16 max */
3352                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3353                 memcpy(req->Buffer, input, input_len);
3354         }
3355
3356         iov[0].iov_base = (char *)req;
3357         /* 1 for Buffer */
3358         iov[0].iov_len = total_len - 1 + input_len;
3359         return 0;
3360 }
3361
3362 void
3363 SMB2_query_info_free(struct smb_rqst *rqst)
3364 {
3365         if (rqst && rqst->rq_iov)
3366                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3367 }
3368
3369 static int
3370 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3371            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3372            u32 additional_info, size_t output_len, size_t min_len, void **data,
3373                 u32 *dlen)
3374 {
3375         struct smb_rqst rqst;
3376         struct smb2_query_info_rsp *rsp = NULL;
3377         struct kvec iov[1];
3378         struct kvec rsp_iov;
3379         int rc = 0;
3380         int resp_buftype = CIFS_NO_BUFFER;
3381         struct cifs_ses *ses = tcon->ses;
3382         struct TCP_Server_Info *server;
3383         int flags = 0;
3384         bool allocated = false;
3385
3386         cifs_dbg(FYI, "Query Info\n");
3387
3388         if (!ses)
3389                 return -EIO;
3390         server = cifs_pick_channel(ses);
3391         if (!server)
3392                 return -EIO;
3393
3394         if (smb3_encryption_required(tcon))
3395                 flags |= CIFS_TRANSFORM_REQ;
3396
3397         memset(&rqst, 0, sizeof(struct smb_rqst));
3398         memset(&iov, 0, sizeof(iov));
3399         rqst.rq_iov = iov;
3400         rqst.rq_nvec = 1;
3401
3402         rc = SMB2_query_info_init(tcon, server,
3403                                   &rqst, persistent_fid, volatile_fid,
3404                                   info_class, info_type, additional_info,
3405                                   output_len, 0, NULL);
3406         if (rc)
3407                 goto qinf_exit;
3408
3409         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3410                                     ses->Suid, info_class, (__u32)info_type);
3411
3412         rc = cifs_send_recv(xid, ses, server,
3413                             &rqst, &resp_buftype, flags, &rsp_iov);
3414         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3415
3416         if (rc) {
3417                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3418                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3419                                 ses->Suid, info_class, (__u32)info_type, rc);
3420                 goto qinf_exit;
3421         }
3422
3423         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3424                                 ses->Suid, info_class, (__u32)info_type);
3425
3426         if (dlen) {
3427                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3428                 if (!*data) {
3429                         *data = kmalloc(*dlen, GFP_KERNEL);
3430                         if (!*data) {
3431                                 cifs_tcon_dbg(VFS,
3432                                         "Error %d allocating memory for acl\n",
3433                                         rc);
3434                                 *dlen = 0;
3435                                 rc = -ENOMEM;
3436                                 goto qinf_exit;
3437                         }
3438                         allocated = true;
3439                 }
3440         }
3441
3442         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3443                                         le32_to_cpu(rsp->OutputBufferLength),
3444                                         &rsp_iov, min_len, *data);
3445         if (rc && allocated) {
3446                 kfree(*data);
3447                 *data = NULL;
3448                 *dlen = 0;
3449         }
3450
3451 qinf_exit:
3452         SMB2_query_info_free(&rqst);
3453         free_rsp_buf(resp_buftype, rsp);
3454         return rc;
3455 }
3456
3457 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3458         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3459 {
3460         return query_info(xid, tcon, persistent_fid, volatile_fid,
3461                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3462                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3463                           sizeof(struct smb2_file_all_info), (void **)&data,
3464                           NULL);
3465 }
3466
3467 int
3468 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3469                 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3470 {
3471         size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3472                         (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3473         *plen = 0;
3474
3475         return query_info(xid, tcon, persistent_fid, volatile_fid,
3476                           SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3477                           output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3478 }
3479
3480 int
3481 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3482                 u64 persistent_fid, u64 volatile_fid,
3483                 void **data, u32 *plen)
3484 {
3485         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
3486         *plen = 0;
3487
3488         return query_info(xid, tcon, persistent_fid, volatile_fid,
3489                           0, SMB2_O_INFO_SECURITY, additional_info,
3490                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3491 }
3492
3493 int
3494 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3495                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3496 {
3497         return query_info(xid, tcon, persistent_fid, volatile_fid,
3498                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3499                           sizeof(struct smb2_file_internal_info),
3500                           sizeof(struct smb2_file_internal_info),
3501                           (void **)&uniqueid, NULL);
3502 }
3503
3504 /*
3505  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3506  * See MS-SMB2 2.2.35 and 2.2.36
3507  */
3508
3509 static int
3510 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3511                  struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3512                  u64 persistent_fid, u64 volatile_fid,
3513                  u32 completion_filter, bool watch_tree)
3514 {
3515         struct smb2_change_notify_req *req;
3516         struct kvec *iov = rqst->rq_iov;
3517         unsigned int total_len;
3518         int rc;
3519
3520         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3521                                  (void **) &req, &total_len);
3522         if (rc)
3523                 return rc;
3524
3525         req->PersistentFileId = persistent_fid;
3526         req->VolatileFileId = volatile_fid;
3527         /* See note 354 of MS-SMB2, 64K max */
3528         req->OutputBufferLength =
3529                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3530         req->CompletionFilter = cpu_to_le32(completion_filter);
3531         if (watch_tree)
3532                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3533         else
3534                 req->Flags = 0;
3535
3536         iov[0].iov_base = (char *)req;
3537         iov[0].iov_len = total_len;
3538
3539         return 0;
3540 }
3541
3542 int
3543 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3544                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3545                 u32 completion_filter)
3546 {
3547         struct cifs_ses *ses = tcon->ses;
3548         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3549         struct smb_rqst rqst;
3550         struct kvec iov[1];
3551         struct kvec rsp_iov = {NULL, 0};
3552         int resp_buftype = CIFS_NO_BUFFER;
3553         int flags = 0;
3554         int rc = 0;
3555
3556         cifs_dbg(FYI, "change notify\n");
3557         if (!ses || !server)
3558                 return -EIO;
3559
3560         if (smb3_encryption_required(tcon))
3561                 flags |= CIFS_TRANSFORM_REQ;
3562
3563         memset(&rqst, 0, sizeof(struct smb_rqst));
3564         memset(&iov, 0, sizeof(iov));
3565         rqst.rq_iov = iov;
3566         rqst.rq_nvec = 1;
3567
3568         rc = SMB2_notify_init(xid, &rqst, tcon, server,
3569                               persistent_fid, volatile_fid,
3570                               completion_filter, watch_tree);
3571         if (rc)
3572                 goto cnotify_exit;
3573
3574         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3575                                 (u8)watch_tree, completion_filter);
3576         rc = cifs_send_recv(xid, ses, server,
3577                             &rqst, &resp_buftype, flags, &rsp_iov);
3578
3579         if (rc != 0) {
3580                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3581                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3582                                 (u8)watch_tree, completion_filter, rc);
3583         } else
3584                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3585                                 ses->Suid, (u8)watch_tree, completion_filter);
3586
3587  cnotify_exit:
3588         if (rqst.rq_iov)
3589                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3590         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3591         return rc;
3592 }
3593
3594
3595
3596 /*
3597  * This is a no-op for now. We're not really interested in the reply, but
3598  * rather in the fact that the server sent one and that server->lstrp
3599  * gets updated.
3600  *
3601  * FIXME: maybe we should consider checking that the reply matches request?
3602  */
3603 static void
3604 smb2_echo_callback(struct mid_q_entry *mid)
3605 {
3606         struct TCP_Server_Info *server = mid->callback_data;
3607         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3608         struct cifs_credits credits = { .value = 0, .instance = 0 };
3609
3610         if (mid->mid_state == MID_RESPONSE_RECEIVED
3611             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3612                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3613                 credits.instance = server->reconnect_instance;
3614         }
3615
3616         DeleteMidQEntry(mid);
3617         add_credits(server, &credits, CIFS_ECHO_OP);
3618 }
3619
3620 void smb2_reconnect_server(struct work_struct *work)
3621 {
3622         struct TCP_Server_Info *server = container_of(work,
3623                                         struct TCP_Server_Info, reconnect.work);
3624         struct cifs_ses *ses;
3625         struct cifs_tcon *tcon, *tcon2;
3626         struct list_head tmp_list;
3627         int tcon_exist = false;
3628         int rc;
3629         int resched = false;
3630
3631
3632         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3633         mutex_lock(&server->reconnect_mutex);
3634
3635         INIT_LIST_HEAD(&tmp_list);
3636         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3637
3638         spin_lock(&cifs_tcp_ses_lock);
3639         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3640                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3641                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3642                                 tcon->tc_count++;
3643                                 list_add_tail(&tcon->rlist, &tmp_list);
3644                                 tcon_exist = true;
3645                         }
3646                 }
3647                 /*
3648                  * IPC has the same lifetime as its session and uses its
3649                  * refcount.
3650                  */
3651                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3652                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3653                         tcon_exist = true;
3654                         ses->ses_count++;
3655                 }
3656         }
3657         /*
3658          * Get the reference to server struct to be sure that the last call of
3659          * cifs_put_tcon() in the loop below won't release the server pointer.
3660          */
3661         if (tcon_exist)
3662                 server->srv_count++;
3663
3664         spin_unlock(&cifs_tcp_ses_lock);
3665
3666         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3667                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3668                 if (!rc)
3669                         cifs_reopen_persistent_handles(tcon);
3670                 else
3671                         resched = true;
3672                 list_del_init(&tcon->rlist);
3673                 if (tcon->ipc)
3674                         cifs_put_smb_ses(tcon->ses);
3675                 else
3676                         cifs_put_tcon(tcon);
3677         }
3678
3679         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3680         if (resched)
3681                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3682         mutex_unlock(&server->reconnect_mutex);
3683
3684         /* now we can safely release srv struct */
3685         if (tcon_exist)
3686                 cifs_put_tcp_session(server, 1);
3687 }
3688
3689 int
3690 SMB2_echo(struct TCP_Server_Info *server)
3691 {
3692         struct smb2_echo_req *req;
3693         int rc = 0;
3694         struct kvec iov[1];
3695         struct smb_rqst rqst = { .rq_iov = iov,
3696                                  .rq_nvec = 1 };
3697         unsigned int total_len;
3698
3699         cifs_dbg(FYI, "In echo request\n");
3700
3701         if (server->tcpStatus == CifsNeedNegotiate) {
3702                 /* No need to send echo on newly established connections */
3703                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
3704                 return rc;
3705         }
3706
3707         rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
3708                                  (void **)&req, &total_len);
3709         if (rc)
3710                 return rc;
3711
3712         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3713
3714         iov[0].iov_len = total_len;
3715         iov[0].iov_base = (char *)req;
3716
3717         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3718                              server, CIFS_ECHO_OP, NULL);
3719         if (rc)
3720                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3721
3722         cifs_small_buf_release(req);
3723         return rc;
3724 }
3725
3726 void
3727 SMB2_flush_free(struct smb_rqst *rqst)
3728 {
3729         if (rqst && rqst->rq_iov)
3730                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3731 }
3732
3733 int
3734 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3735                 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3736                 u64 persistent_fid, u64 volatile_fid)
3737 {
3738         struct smb2_flush_req *req;
3739         struct kvec *iov = rqst->rq_iov;
3740         unsigned int total_len;
3741         int rc;
3742
3743         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
3744                                  (void **) &req, &total_len);
3745         if (rc)
3746                 return rc;
3747
3748         req->PersistentFileId = persistent_fid;
3749         req->VolatileFileId = volatile_fid;
3750
3751         iov[0].iov_base = (char *)req;
3752         iov[0].iov_len = total_len;
3753
3754         return 0;
3755 }
3756
3757 int
3758 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3759            u64 volatile_fid)
3760 {
3761         struct cifs_ses *ses = tcon->ses;
3762         struct smb_rqst rqst;
3763         struct kvec iov[1];
3764         struct kvec rsp_iov = {NULL, 0};
3765         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3766         int resp_buftype = CIFS_NO_BUFFER;
3767         int flags = 0;
3768         int rc = 0;
3769
3770         cifs_dbg(FYI, "flush\n");
3771         if (!ses || !(ses->server))
3772                 return -EIO;
3773
3774         if (smb3_encryption_required(tcon))
3775                 flags |= CIFS_TRANSFORM_REQ;
3776
3777         memset(&rqst, 0, sizeof(struct smb_rqst));
3778         memset(&iov, 0, sizeof(iov));
3779         rqst.rq_iov = iov;
3780         rqst.rq_nvec = 1;
3781
3782         rc = SMB2_flush_init(xid, &rqst, tcon, server,
3783                              persistent_fid, volatile_fid);
3784         if (rc)
3785                 goto flush_exit;
3786
3787         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3788         rc = cifs_send_recv(xid, ses, server,
3789                             &rqst, &resp_buftype, flags, &rsp_iov);
3790
3791         if (rc != 0) {
3792                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3793                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3794                                      rc);
3795         } else
3796                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
3797                                       ses->Suid);
3798
3799  flush_exit:
3800         SMB2_flush_free(&rqst);
3801         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3802         return rc;
3803 }
3804
3805 /*
3806  * To form a chain of read requests, any read requests after the first should
3807  * have the end_of_chain boolean set to true.
3808  */
3809 static int
3810 smb2_new_read_req(void **buf, unsigned int *total_len,
3811         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3812         unsigned int remaining_bytes, int request_type)
3813 {
3814         int rc = -EACCES;
3815         struct smb2_read_plain_req *req = NULL;
3816         struct smb2_sync_hdr *shdr;
3817         struct TCP_Server_Info *server = io_parms->server;
3818
3819         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
3820                                  (void **) &req, total_len);
3821         if (rc)
3822                 return rc;
3823
3824         if (server == NULL)
3825                 return -ECONNABORTED;
3826
3827         shdr = &req->sync_hdr;
3828         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3829
3830         req->PersistentFileId = io_parms->persistent_fid;
3831         req->VolatileFileId = io_parms->volatile_fid;
3832         req->ReadChannelInfoOffset = 0; /* reserved */
3833         req->ReadChannelInfoLength = 0; /* reserved */
3834         req->Channel = 0; /* reserved */
3835         req->MinimumCount = 0;
3836         req->Length = cpu_to_le32(io_parms->length);
3837         req->Offset = cpu_to_le64(io_parms->offset);
3838
3839         trace_smb3_read_enter(0 /* xid */,
3840                         io_parms->persistent_fid,
3841                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3842                         io_parms->offset, io_parms->length);
3843 #ifdef CONFIG_CIFS_SMB_DIRECT
3844         /*
3845          * If we want to do a RDMA write, fill in and append
3846          * smbd_buffer_descriptor_v1 to the end of read request
3847          */
3848         if (server->rdma && rdata && !server->sign &&
3849                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3850
3851                 struct smbd_buffer_descriptor_v1 *v1;
3852                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3853
3854                 rdata->mr = smbd_register_mr(
3855                                 server->smbd_conn, rdata->pages,
3856                                 rdata->nr_pages, rdata->page_offset,
3857                                 rdata->tailsz, true, need_invalidate);
3858                 if (!rdata->mr)
3859                         return -EAGAIN;
3860
3861                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3862                 if (need_invalidate)
3863                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3864                 req->ReadChannelInfoOffset =
3865                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3866                 req->ReadChannelInfoLength =
3867                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3868                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3869                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3870                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3871                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3872
3873                 *total_len += sizeof(*v1) - 1;
3874         }
3875 #endif
3876         if (request_type & CHAINED_REQUEST) {
3877                 if (!(request_type & END_OF_CHAIN)) {
3878                         /* next 8-byte aligned request */
3879                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3880                         shdr->NextCommand = cpu_to_le32(*total_len);
3881                 } else /* END_OF_CHAIN */
3882                         shdr->NextCommand = 0;
3883                 if (request_type & RELATED_REQUEST) {
3884                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3885                         /*
3886                          * Related requests use info from previous read request
3887                          * in chain.
3888                          */
3889                         shdr->SessionId = 0xFFFFFFFF;
3890                         shdr->TreeId = 0xFFFFFFFF;
3891                         req->PersistentFileId = 0xFFFFFFFF;
3892                         req->VolatileFileId = 0xFFFFFFFF;
3893                 }
3894         }
3895         if (remaining_bytes > io_parms->length)
3896                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3897         else
3898                 req->RemainingBytes = 0;
3899
3900         *buf = req;
3901         return rc;
3902 }
3903
3904 static void
3905 smb2_readv_callback(struct mid_q_entry *mid)
3906 {
3907         struct cifs_readdata *rdata = mid->callback_data;
3908         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3909         struct TCP_Server_Info *server = rdata->server;
3910         struct smb2_sync_hdr *shdr =
3911                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3912         struct cifs_credits credits = { .value = 0, .instance = 0 };
3913         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
3914                                  .rq_nvec = 1,
3915                                  .rq_pages = rdata->pages,
3916                                  .rq_offset = rdata->page_offset,
3917                                  .rq_npages = rdata->nr_pages,
3918                                  .rq_pagesz = rdata->pagesz,
3919                                  .rq_tailsz = rdata->tailsz };
3920
3921         WARN_ONCE(rdata->server != mid->server,
3922                   "rdata server %p != mid server %p",
3923                   rdata->server, mid->server);
3924
3925         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3926                  __func__, mid->mid, mid->mid_state, rdata->result,
3927                  rdata->bytes);
3928
3929         switch (mid->mid_state) {
3930         case MID_RESPONSE_RECEIVED:
3931                 credits.value = le16_to_cpu(shdr->CreditRequest);
3932                 credits.instance = server->reconnect_instance;
3933                 /* result already set, check signature */
3934                 if (server->sign && !mid->decrypted) {
3935                         int rc;
3936
3937                         rc = smb2_verify_signature(&rqst, server);
3938                         if (rc)
3939                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
3940                                          rc);
3941                 }
3942                 /* FIXME: should this be counted toward the initiating task? */
3943                 task_io_account_read(rdata->got_bytes);
3944                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3945                 break;
3946         case MID_REQUEST_SUBMITTED:
3947         case MID_RETRY_NEEDED:
3948                 rdata->result = -EAGAIN;
3949                 if (server->sign && rdata->got_bytes)
3950                         /* reset bytes number since we can not check a sign */
3951                         rdata->got_bytes = 0;
3952                 /* FIXME: should this be counted toward the initiating task? */
3953                 task_io_account_read(rdata->got_bytes);
3954                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3955                 break;
3956         case MID_RESPONSE_MALFORMED:
3957                 credits.value = le16_to_cpu(shdr->CreditRequest);
3958                 credits.instance = server->reconnect_instance;
3959                 fallthrough;
3960         default:
3961                 rdata->result = -EIO;
3962         }
3963 #ifdef CONFIG_CIFS_SMB_DIRECT
3964         /*
3965          * If this rdata has a memmory registered, the MR can be freed
3966          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3967          * because they have limited number and are used for future I/Os
3968          */
3969         if (rdata->mr) {
3970                 smbd_deregister_mr(rdata->mr);
3971                 rdata->mr = NULL;
3972         }
3973 #endif
3974         if (rdata->result && rdata->result != -ENODATA) {
3975                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3976                 trace_smb3_read_err(0 /* xid */,
3977                                     rdata->cfile->fid.persistent_fid,
3978                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3979                                     rdata->bytes, rdata->result);
3980         } else
3981                 trace_smb3_read_done(0 /* xid */,
3982                                      rdata->cfile->fid.persistent_fid,
3983                                      tcon->tid, tcon->ses->Suid,
3984                                      rdata->offset, rdata->got_bytes);
3985
3986         queue_work(cifsiod_wq, &rdata->work);
3987         DeleteMidQEntry(mid);
3988         add_credits(server, &credits, 0);
3989 }
3990
3991 /* smb2_async_readv - send an async read, and set up mid to handle result */
3992 int
3993 smb2_async_readv(struct cifs_readdata *rdata)
3994 {
3995         int rc, flags = 0;
3996         char *buf;
3997         struct smb2_sync_hdr *shdr;
3998         struct cifs_io_parms io_parms;
3999         struct smb_rqst rqst = { .rq_iov = rdata->iov,
4000                                  .rq_nvec = 1 };
4001         struct TCP_Server_Info *server;
4002         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4003         unsigned int total_len;
4004
4005         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
4006                  __func__, rdata->offset, rdata->bytes);
4007
4008         if (!rdata->server)
4009                 rdata->server = cifs_pick_channel(tcon->ses);
4010
4011         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
4012         io_parms.server = server = rdata->server;
4013         io_parms.offset = rdata->offset;
4014         io_parms.length = rdata->bytes;
4015         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
4016         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
4017         io_parms.pid = rdata->pid;
4018
4019         rc = smb2_new_read_req(
4020                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4021         if (rc)
4022                 return rc;
4023
4024         if (smb3_encryption_required(io_parms.tcon))
4025                 flags |= CIFS_TRANSFORM_REQ;
4026
4027         rdata->iov[0].iov_base = buf;
4028         rdata->iov[0].iov_len = total_len;
4029
4030         shdr = (struct smb2_sync_hdr *)buf;
4031
4032         if (rdata->credits.value > 0) {
4033                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
4034                                                 SMB2_MAX_BUFFER_SIZE));
4035                 shdr->CreditRequest =
4036                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
4037
4038                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
4039                 if (rc)
4040                         goto async_readv_out;
4041
4042                 flags |= CIFS_HAS_CREDITS;
4043         }
4044
4045         kref_get(&rdata->refcount);
4046         rc = cifs_call_async(server, &rqst,
4047                              cifs_readv_receive, smb2_readv_callback,
4048                              smb3_handle_read_data, rdata, flags,
4049                              &rdata->credits);
4050         if (rc) {
4051                 kref_put(&rdata->refcount, cifs_readdata_release);
4052                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4053                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4054                                     io_parms.tcon->tid,
4055                                     io_parms.tcon->ses->Suid,
4056                                     io_parms.offset, io_parms.length, rc);
4057         }
4058
4059 async_readv_out:
4060         cifs_small_buf_release(buf);
4061         return rc;
4062 }
4063
4064 int
4065 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4066           unsigned int *nbytes, char **buf, int *buf_type)
4067 {
4068         struct smb_rqst rqst;
4069         int resp_buftype, rc;
4070         struct smb2_read_plain_req *req = NULL;
4071         struct smb2_read_rsp *rsp = NULL;
4072         struct kvec iov[1];
4073         struct kvec rsp_iov;
4074         unsigned int total_len;
4075         int flags = CIFS_LOG_ERROR;
4076         struct cifs_ses *ses = io_parms->tcon->ses;
4077
4078         if (!io_parms->server)
4079                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4080
4081         *nbytes = 0;
4082         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4083         if (rc)
4084                 return rc;
4085
4086         if (smb3_encryption_required(io_parms->tcon))
4087                 flags |= CIFS_TRANSFORM_REQ;
4088
4089         iov[0].iov_base = (char *)req;
4090         iov[0].iov_len = total_len;
4091
4092         memset(&rqst, 0, sizeof(struct smb_rqst));
4093         rqst.rq_iov = iov;
4094         rqst.rq_nvec = 1;
4095
4096         rc = cifs_send_recv(xid, ses, io_parms->server,
4097                             &rqst, &resp_buftype, flags, &rsp_iov);
4098         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4099
4100         if (rc) {
4101                 if (rc != -ENODATA) {
4102                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4103                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
4104                         trace_smb3_read_err(xid, req->PersistentFileId,
4105                                             io_parms->tcon->tid, ses->Suid,
4106                                             io_parms->offset, io_parms->length,
4107                                             rc);
4108                 } else
4109                         trace_smb3_read_done(xid, req->PersistentFileId,
4110                                     io_parms->tcon->tid, ses->Suid,
4111                                     io_parms->offset, 0);
4112                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4113                 cifs_small_buf_release(req);
4114                 return rc == -ENODATA ? 0 : rc;
4115         } else
4116                 trace_smb3_read_done(xid, req->PersistentFileId,
4117                                     io_parms->tcon->tid, ses->Suid,
4118                                     io_parms->offset, io_parms->length);
4119
4120         cifs_small_buf_release(req);
4121
4122         *nbytes = le32_to_cpu(rsp->DataLength);
4123         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4124             (*nbytes > io_parms->length)) {
4125                 cifs_dbg(FYI, "bad length %d for count %d\n",
4126                          *nbytes, io_parms->length);
4127                 rc = -EIO;
4128                 *nbytes = 0;
4129         }
4130
4131         if (*buf) {
4132                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4133                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4134         } else if (resp_buftype != CIFS_NO_BUFFER) {
4135                 *buf = rsp_iov.iov_base;
4136                 if (resp_buftype == CIFS_SMALL_BUFFER)
4137                         *buf_type = CIFS_SMALL_BUFFER;
4138                 else if (resp_buftype == CIFS_LARGE_BUFFER)
4139                         *buf_type = CIFS_LARGE_BUFFER;
4140         }
4141         return rc;
4142 }
4143
4144 /*
4145  * Check the mid_state and signature on received buffer (if any), and queue the
4146  * workqueue completion task.
4147  */
4148 static void
4149 smb2_writev_callback(struct mid_q_entry *mid)
4150 {
4151         struct cifs_writedata *wdata = mid->callback_data;
4152         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4153         struct TCP_Server_Info *server = wdata->server;
4154         unsigned int written;
4155         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4156         struct cifs_credits credits = { .value = 0, .instance = 0 };
4157
4158         WARN_ONCE(wdata->server != mid->server,
4159                   "wdata server %p != mid server %p",
4160                   wdata->server, mid->server);
4161
4162         switch (mid->mid_state) {
4163         case MID_RESPONSE_RECEIVED:
4164                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4165                 credits.instance = server->reconnect_instance;
4166                 wdata->result = smb2_check_receive(mid, server, 0);
4167                 if (wdata->result != 0)
4168                         break;
4169
4170                 written = le32_to_cpu(rsp->DataLength);
4171                 /*
4172                  * Mask off high 16 bits when bytes written as returned
4173                  * by the server is greater than bytes requested by the
4174                  * client. OS/2 servers are known to set incorrect
4175                  * CountHigh values.
4176                  */
4177                 if (written > wdata->bytes)
4178                         written &= 0xFFFF;
4179
4180                 if (written < wdata->bytes)
4181                         wdata->result = -ENOSPC;
4182                 else
4183                         wdata->bytes = written;
4184                 break;
4185         case MID_REQUEST_SUBMITTED:
4186         case MID_RETRY_NEEDED:
4187                 wdata->result = -EAGAIN;
4188                 break;
4189         case MID_RESPONSE_MALFORMED:
4190                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4191                 credits.instance = server->reconnect_instance;
4192                 fallthrough;
4193         default:
4194                 wdata->result = -EIO;
4195                 break;
4196         }
4197 #ifdef CONFIG_CIFS_SMB_DIRECT
4198         /*
4199          * If this wdata has a memory registered, the MR can be freed
4200          * The number of MRs available is limited, it's important to recover
4201          * used MR as soon as I/O is finished. Hold MR longer in the later
4202          * I/O process can possibly result in I/O deadlock due to lack of MR
4203          * to send request on I/O retry
4204          */
4205         if (wdata->mr) {
4206                 smbd_deregister_mr(wdata->mr);
4207                 wdata->mr = NULL;
4208         }
4209 #endif
4210         if (wdata->result) {
4211                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4212                 trace_smb3_write_err(0 /* no xid */,
4213                                      wdata->cfile->fid.persistent_fid,
4214                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4215                                      wdata->bytes, wdata->result);
4216                 if (wdata->result == -ENOSPC)
4217                         pr_warn_once("Out of space writing to %s\n",
4218                                      tcon->treeName);
4219         } else
4220                 trace_smb3_write_done(0 /* no xid */,
4221                                       wdata->cfile->fid.persistent_fid,
4222                                       tcon->tid, tcon->ses->Suid,
4223                                       wdata->offset, wdata->bytes);
4224
4225         queue_work(cifsiod_wq, &wdata->work);
4226         DeleteMidQEntry(mid);
4227         add_credits(server, &credits, 0);
4228 }
4229
4230 /* smb2_async_writev - send an async write, and set up mid to handle result */
4231 int
4232 smb2_async_writev(struct cifs_writedata *wdata,
4233                   void (*release)(struct kref *kref))
4234 {
4235         int rc = -EACCES, flags = 0;
4236         struct smb2_write_req *req = NULL;
4237         struct smb2_sync_hdr *shdr;
4238         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4239         struct TCP_Server_Info *server = wdata->server;
4240         struct kvec iov[1];
4241         struct smb_rqst rqst = { };
4242         unsigned int total_len;
4243
4244         if (!wdata->server)
4245                 server = wdata->server = cifs_pick_channel(tcon->ses);
4246
4247         rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4248                                  (void **) &req, &total_len);
4249         if (rc)
4250                 return rc;
4251
4252         if (smb3_encryption_required(tcon))
4253                 flags |= CIFS_TRANSFORM_REQ;
4254
4255         shdr = (struct smb2_sync_hdr *)req;
4256         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
4257
4258         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
4259         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
4260         req->WriteChannelInfoOffset = 0;
4261         req->WriteChannelInfoLength = 0;
4262         req->Channel = 0;
4263         req->Offset = cpu_to_le64(wdata->offset);
4264         req->DataOffset = cpu_to_le16(
4265                                 offsetof(struct smb2_write_req, Buffer));
4266         req->RemainingBytes = 0;
4267
4268         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
4269                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
4270 #ifdef CONFIG_CIFS_SMB_DIRECT
4271         /*
4272          * If we want to do a server RDMA read, fill in and append
4273          * smbd_buffer_descriptor_v1 to the end of write request
4274          */
4275         if (server->rdma && !server->sign && wdata->bytes >=
4276                 server->smbd_conn->rdma_readwrite_threshold) {
4277
4278                 struct smbd_buffer_descriptor_v1 *v1;
4279                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4280
4281                 wdata->mr = smbd_register_mr(
4282                                 server->smbd_conn, wdata->pages,
4283                                 wdata->nr_pages, wdata->page_offset,
4284                                 wdata->tailsz, false, need_invalidate);
4285                 if (!wdata->mr) {
4286                         rc = -EAGAIN;
4287                         goto async_writev_out;
4288                 }
4289                 req->Length = 0;
4290                 req->DataOffset = 0;
4291                 if (wdata->nr_pages > 1)
4292                         req->RemainingBytes =
4293                                 cpu_to_le32(
4294                                         (wdata->nr_pages - 1) * wdata->pagesz -
4295                                         wdata->page_offset + wdata->tailsz
4296                                 );
4297                 else
4298                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
4299                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4300                 if (need_invalidate)
4301                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4302                 req->WriteChannelInfoOffset =
4303                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4304                 req->WriteChannelInfoLength =
4305                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4306                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4307                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4308                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4309                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4310         }
4311 #endif
4312         iov[0].iov_len = total_len - 1;
4313         iov[0].iov_base = (char *)req;
4314
4315         rqst.rq_iov = iov;
4316         rqst.rq_nvec = 1;
4317         rqst.rq_pages = wdata->pages;
4318         rqst.rq_offset = wdata->page_offset;
4319         rqst.rq_npages = wdata->nr_pages;
4320         rqst.rq_pagesz = wdata->pagesz;
4321         rqst.rq_tailsz = wdata->tailsz;
4322 #ifdef CONFIG_CIFS_SMB_DIRECT
4323         if (wdata->mr) {
4324                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4325                 rqst.rq_npages = 0;
4326         }
4327 #endif
4328         cifs_dbg(FYI, "async write at %llu %u bytes\n",
4329                  wdata->offset, wdata->bytes);
4330
4331 #ifdef CONFIG_CIFS_SMB_DIRECT
4332         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4333         if (!wdata->mr)
4334                 req->Length = cpu_to_le32(wdata->bytes);
4335 #else
4336         req->Length = cpu_to_le32(wdata->bytes);
4337 #endif
4338
4339         if (wdata->credits.value > 0) {
4340                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4341                                                     SMB2_MAX_BUFFER_SIZE));
4342                 shdr->CreditRequest =
4343                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
4344
4345                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4346                 if (rc)
4347                         goto async_writev_out;
4348
4349                 flags |= CIFS_HAS_CREDITS;
4350         }
4351
4352         kref_get(&wdata->refcount);
4353         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4354                              wdata, flags, &wdata->credits);
4355
4356         if (rc) {
4357                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
4358                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4359                                      wdata->bytes, rc);
4360                 kref_put(&wdata->refcount, release);
4361                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4362         }
4363
4364 async_writev_out:
4365         cifs_small_buf_release(req);
4366         return rc;
4367 }
4368
4369 /*
4370  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4371  * The length field from io_parms must be at least 1 and indicates a number of
4372  * elements with data to write that begins with position 1 in iov array. All
4373  * data length is specified by count.
4374  */
4375 int
4376 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4377            unsigned int *nbytes, struct kvec *iov, int n_vec)
4378 {
4379         struct smb_rqst rqst;
4380         int rc = 0;
4381         struct smb2_write_req *req = NULL;
4382         struct smb2_write_rsp *rsp = NULL;
4383         int resp_buftype;
4384         struct kvec rsp_iov;
4385         int flags = 0;
4386         unsigned int total_len;
4387         struct TCP_Server_Info *server;
4388
4389         *nbytes = 0;
4390
4391         if (n_vec < 1)
4392                 return rc;
4393
4394         if (!io_parms->server)
4395                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4396         server = io_parms->server;
4397         if (server == NULL)
4398                 return -ECONNABORTED;
4399
4400         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
4401                                  (void **) &req, &total_len);
4402         if (rc)
4403                 return rc;
4404
4405         if (smb3_encryption_required(io_parms->tcon))
4406                 flags |= CIFS_TRANSFORM_REQ;
4407
4408         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
4409
4410         req->PersistentFileId = io_parms->persistent_fid;
4411         req->VolatileFileId = io_parms->volatile_fid;
4412         req->WriteChannelInfoOffset = 0;
4413         req->WriteChannelInfoLength = 0;
4414         req->Channel = 0;
4415         req->Length = cpu_to_le32(io_parms->length);
4416         req->Offset = cpu_to_le64(io_parms->offset);
4417         req->DataOffset = cpu_to_le16(
4418                                 offsetof(struct smb2_write_req, Buffer));
4419         req->RemainingBytes = 0;
4420
4421         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4422                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4423                 io_parms->offset, io_parms->length);
4424
4425         iov[0].iov_base = (char *)req;
4426         /* 1 for Buffer */
4427         iov[0].iov_len = total_len - 1;
4428
4429         memset(&rqst, 0, sizeof(struct smb_rqst));
4430         rqst.rq_iov = iov;
4431         rqst.rq_nvec = n_vec + 1;
4432
4433         rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
4434                             &rqst,
4435                             &resp_buftype, flags, &rsp_iov);
4436         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4437
4438         if (rc) {
4439                 trace_smb3_write_err(xid, req->PersistentFileId,
4440                                      io_parms->tcon->tid,
4441                                      io_parms->tcon->ses->Suid,
4442                                      io_parms->offset, io_parms->length, rc);
4443                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4444                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4445         } else {
4446                 *nbytes = le32_to_cpu(rsp->DataLength);
4447                 trace_smb3_write_done(xid, req->PersistentFileId,
4448                                      io_parms->tcon->tid,
4449                                      io_parms->tcon->ses->Suid,
4450                                      io_parms->offset, *nbytes);
4451         }
4452
4453         cifs_small_buf_release(req);
4454         free_rsp_buf(resp_buftype, rsp);
4455         return rc;
4456 }
4457
4458 int posix_info_sid_size(const void *beg, const void *end)
4459 {
4460         size_t subauth;
4461         int total;
4462
4463         if (beg + 1 > end)
4464                 return -1;
4465
4466         subauth = *(u8 *)(beg+1);
4467         if (subauth < 1 || subauth > 15)
4468                 return -1;
4469
4470         total = 1 + 1 + 6 + 4*subauth;
4471         if (beg + total > end)
4472                 return -1;
4473
4474         return total;
4475 }
4476
4477 int posix_info_parse(const void *beg, const void *end,
4478                      struct smb2_posix_info_parsed *out)
4479
4480 {
4481         int total_len = 0;
4482         int sid_len;
4483         int name_len;
4484         const void *owner_sid;
4485         const void *group_sid;
4486         const void *name;
4487
4488         /* if no end bound given, assume payload to be correct */
4489         if (!end) {
4490                 const struct smb2_posix_info *p = beg;
4491
4492                 end = beg + le32_to_cpu(p->NextEntryOffset);
4493                 /* last element will have a 0 offset, pick a sensible bound */
4494                 if (end == beg)
4495                         end += 0xFFFF;
4496         }
4497
4498         /* check base buf */
4499         if (beg + sizeof(struct smb2_posix_info) > end)
4500                 return -1;
4501         total_len = sizeof(struct smb2_posix_info);
4502
4503         /* check owner sid */
4504         owner_sid = beg + total_len;
4505         sid_len = posix_info_sid_size(owner_sid, end);
4506         if (sid_len < 0)
4507                 return -1;
4508         total_len += sid_len;
4509
4510         /* check group sid */
4511         group_sid = beg + total_len;
4512         sid_len = posix_info_sid_size(group_sid, end);
4513         if (sid_len < 0)
4514                 return -1;
4515         total_len += sid_len;
4516
4517         /* check name len */
4518         if (beg + total_len + 4 > end)
4519                 return -1;
4520         name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
4521         if (name_len < 1 || name_len > 0xFFFF)
4522                 return -1;
4523         total_len += 4;
4524
4525         /* check name */
4526         name = beg + total_len;
4527         if (name + name_len > end)
4528                 return -1;
4529         total_len += name_len;
4530
4531         if (out) {
4532                 out->base = beg;
4533                 out->size = total_len;
4534                 out->name_len = name_len;
4535                 out->name = name;
4536                 memcpy(&out->owner, owner_sid,
4537                        posix_info_sid_size(owner_sid, end));
4538                 memcpy(&out->group, group_sid,
4539                        posix_info_sid_size(group_sid, end));
4540         }
4541         return total_len;
4542 }
4543
4544 static int posix_info_extra_size(const void *beg, const void *end)
4545 {
4546         int len = posix_info_parse(beg, end, NULL);
4547
4548         if (len < 0)
4549                 return -1;
4550         return len - sizeof(struct smb2_posix_info);
4551 }
4552
4553 static unsigned int
4554 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
4555             size_t size)
4556 {
4557         int len;
4558         unsigned int entrycount = 0;
4559         unsigned int next_offset = 0;
4560         char *entryptr;
4561         FILE_DIRECTORY_INFO *dir_info;
4562
4563         if (bufstart == NULL)
4564                 return 0;
4565
4566         entryptr = bufstart;
4567
4568         while (1) {
4569                 if (entryptr + next_offset < entryptr ||
4570                     entryptr + next_offset > end_of_buf ||
4571                     entryptr + next_offset + size > end_of_buf) {
4572                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4573                         break;
4574                 }
4575
4576                 entryptr = entryptr + next_offset;
4577                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4578
4579                 if (infotype == SMB_FIND_FILE_POSIX_INFO)
4580                         len = posix_info_extra_size(entryptr, end_of_buf);
4581                 else
4582                         len = le32_to_cpu(dir_info->FileNameLength);
4583
4584                 if (len < 0 ||
4585                     entryptr + len < entryptr ||
4586                     entryptr + len > end_of_buf ||
4587                     entryptr + len + size > end_of_buf) {
4588                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4589                                  end_of_buf);
4590                         break;
4591                 }
4592
4593                 *lastentry = entryptr;
4594                 entrycount++;
4595
4596                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4597                 if (!next_offset)
4598                         break;
4599         }
4600
4601         return entrycount;
4602 }
4603
4604 /*
4605  * Readdir/FindFirst
4606  */
4607 int SMB2_query_directory_init(const unsigned int xid,
4608                               struct cifs_tcon *tcon,
4609                               struct TCP_Server_Info *server,
4610                               struct smb_rqst *rqst,
4611                               u64 persistent_fid, u64 volatile_fid,
4612                               int index, int info_level)
4613 {
4614         struct smb2_query_directory_req *req;
4615         unsigned char *bufptr;
4616         __le16 asteriks = cpu_to_le16('*');
4617         unsigned int output_size = CIFSMaxBufSize -
4618                 MAX_SMB2_CREATE_RESPONSE_SIZE -
4619                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
4620         unsigned int total_len;
4621         struct kvec *iov = rqst->rq_iov;
4622         int len, rc;
4623
4624         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
4625                                  (void **) &req, &total_len);
4626         if (rc)
4627                 return rc;
4628
4629         switch (info_level) {
4630         case SMB_FIND_FILE_DIRECTORY_INFO:
4631                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4632                 break;
4633         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4634                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4635                 break;
4636         case SMB_FIND_FILE_POSIX_INFO:
4637                 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
4638                 break;
4639         default:
4640                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4641                         info_level);
4642                 return -EINVAL;
4643         }
4644
4645         req->FileIndex = cpu_to_le32(index);
4646         req->PersistentFileId = persistent_fid;
4647         req->VolatileFileId = volatile_fid;
4648
4649         len = 0x2;
4650         bufptr = req->Buffer;
4651         memcpy(bufptr, &asteriks, len);
4652
4653         req->FileNameOffset =
4654                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4655         req->FileNameLength = cpu_to_le16(len);
4656         /*
4657          * BB could be 30 bytes or so longer if we used SMB2 specific
4658          * buffer lengths, but this is safe and close enough.
4659          */
4660         output_size = min_t(unsigned int, output_size, server->maxBuf);
4661         output_size = min_t(unsigned int, output_size, 2 << 15);
4662         req->OutputBufferLength = cpu_to_le32(output_size);
4663
4664         iov[0].iov_base = (char *)req;
4665         /* 1 for Buffer */
4666         iov[0].iov_len = total_len - 1;
4667
4668         iov[1].iov_base = (char *)(req->Buffer);
4669         iov[1].iov_len = len;
4670
4671         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4672                         tcon->ses->Suid, index, output_size);
4673
4674         return 0;
4675 }
4676
4677 void SMB2_query_directory_free(struct smb_rqst *rqst)
4678 {
4679         if (rqst && rqst->rq_iov) {
4680                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4681         }
4682 }
4683
4684 int
4685 smb2_parse_query_directory(struct cifs_tcon *tcon,
4686                            struct kvec *rsp_iov,
4687                            int resp_buftype,
4688                            struct cifs_search_info *srch_inf)
4689 {
4690         struct smb2_query_directory_rsp *rsp;
4691         size_t info_buf_size;
4692         char *end_of_smb;
4693         int rc;
4694
4695         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4696
4697         switch (srch_inf->info_level) {
4698         case SMB_FIND_FILE_DIRECTORY_INFO:
4699                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4700                 break;
4701         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4702                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4703                 break;
4704         case SMB_FIND_FILE_POSIX_INFO:
4705                 /* note that posix payload are variable size */
4706                 info_buf_size = sizeof(struct smb2_posix_info);
4707                 break;
4708         default:
4709                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4710                          srch_inf->info_level);
4711                 return -EINVAL;
4712         }
4713
4714         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4715                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4716                                info_buf_size);
4717         if (rc) {
4718                 cifs_tcon_dbg(VFS, "bad info payload");
4719                 return rc;
4720         }
4721
4722         srch_inf->unicode = true;
4723
4724         if (srch_inf->ntwrk_buf_start) {
4725                 if (srch_inf->smallBuf)
4726                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4727                 else
4728                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4729         }
4730         srch_inf->ntwrk_buf_start = (char *)rsp;
4731         srch_inf->srch_entries_start = srch_inf->last_entry =
4732                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4733         end_of_smb = rsp_iov->iov_len + (char *)rsp;
4734
4735         srch_inf->entries_in_buffer = num_entries(
4736                 srch_inf->info_level,
4737                 srch_inf->srch_entries_start,
4738                 end_of_smb,
4739                 &srch_inf->last_entry,
4740                 info_buf_size);
4741
4742         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4743         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4744                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4745                  srch_inf->srch_entries_start, srch_inf->last_entry);
4746         if (resp_buftype == CIFS_LARGE_BUFFER)
4747                 srch_inf->smallBuf = false;
4748         else if (resp_buftype == CIFS_SMALL_BUFFER)
4749                 srch_inf->smallBuf = true;
4750         else
4751                 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
4752
4753         return 0;
4754 }
4755
4756 int
4757 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4758                      u64 persistent_fid, u64 volatile_fid, int index,
4759                      struct cifs_search_info *srch_inf)
4760 {
4761         struct smb_rqst rqst;
4762         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
4763         struct smb2_query_directory_rsp *rsp = NULL;
4764         int resp_buftype = CIFS_NO_BUFFER;
4765         struct kvec rsp_iov;
4766         int rc = 0;
4767         struct cifs_ses *ses = tcon->ses;
4768         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4769         int flags = 0;
4770
4771         if (!ses || !(ses->server))
4772                 return -EIO;
4773
4774         if (smb3_encryption_required(tcon))
4775                 flags |= CIFS_TRANSFORM_REQ;
4776
4777         memset(&rqst, 0, sizeof(struct smb_rqst));
4778         memset(&iov, 0, sizeof(iov));
4779         rqst.rq_iov = iov;
4780         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
4781
4782         rc = SMB2_query_directory_init(xid, tcon, server,
4783                                        &rqst, persistent_fid,
4784                                        volatile_fid, index,
4785                                        srch_inf->info_level);
4786         if (rc)
4787                 goto qdir_exit;
4788
4789         rc = cifs_send_recv(xid, ses, server,
4790                             &rqst, &resp_buftype, flags, &rsp_iov);
4791         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4792
4793         if (rc) {
4794                 if (rc == -ENODATA &&
4795                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4796                         trace_smb3_query_dir_done(xid, persistent_fid,
4797                                 tcon->tid, tcon->ses->Suid, index, 0);
4798                         srch_inf->endOfSearch = true;
4799                         rc = 0;
4800                 } else {
4801                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4802                                 tcon->ses->Suid, index, 0, rc);
4803                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4804                 }
4805                 goto qdir_exit;
4806         }
4807
4808         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
4809                                         srch_inf);
4810         if (rc) {
4811                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4812                         tcon->ses->Suid, index, 0, rc);
4813                 goto qdir_exit;
4814         }
4815         resp_buftype = CIFS_NO_BUFFER;
4816
4817         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4818                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4819
4820 qdir_exit:
4821         SMB2_query_directory_free(&rqst);
4822         free_rsp_buf(resp_buftype, rsp);
4823         return rc;
4824 }
4825
4826 int
4827 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4828                    struct smb_rqst *rqst,
4829                    u64 persistent_fid, u64 volatile_fid, u32 pid,
4830                    u8 info_class, u8 info_type, u32 additional_info,
4831                    void **data, unsigned int *size)
4832 {
4833         struct smb2_set_info_req *req;
4834         struct kvec *iov = rqst->rq_iov;
4835         unsigned int i, total_len;
4836         int rc;
4837
4838         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
4839                                  (void **) &req, &total_len);
4840         if (rc)
4841                 return rc;
4842
4843         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4844         req->InfoType = info_type;
4845         req->FileInfoClass = info_class;
4846         req->PersistentFileId = persistent_fid;
4847         req->VolatileFileId = volatile_fid;
4848         req->AdditionalInformation = cpu_to_le32(additional_info);
4849
4850         req->BufferOffset =
4851                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4852         req->BufferLength = cpu_to_le32(*size);
4853
4854         memcpy(req->Buffer, *data, *size);
4855         total_len += *size;
4856
4857         iov[0].iov_base = (char *)req;
4858         /* 1 for Buffer */
4859         iov[0].iov_len = total_len - 1;
4860
4861         for (i = 1; i < rqst->rq_nvec; i++) {
4862                 le32_add_cpu(&req->BufferLength, size[i]);
4863                 iov[i].iov_base = (char *)data[i];
4864                 iov[i].iov_len = size[i];
4865         }
4866
4867         return 0;
4868 }
4869
4870 void
4871 SMB2_set_info_free(struct smb_rqst *rqst)
4872 {
4873         if (rqst && rqst->rq_iov)
4874                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4875 }
4876
4877 static int
4878 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4879                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4880                u8 info_type, u32 additional_info, unsigned int num,
4881                 void **data, unsigned int *size)
4882 {
4883         struct smb_rqst rqst;
4884         struct smb2_set_info_rsp *rsp = NULL;
4885         struct kvec *iov;
4886         struct kvec rsp_iov;
4887         int rc = 0;
4888         int resp_buftype;
4889         struct cifs_ses *ses = tcon->ses;
4890         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4891         int flags = 0;
4892
4893         if (!ses || !server)
4894                 return -EIO;
4895
4896         if (!num)
4897                 return -EINVAL;
4898
4899         if (smb3_encryption_required(tcon))
4900                 flags |= CIFS_TRANSFORM_REQ;
4901
4902         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4903         if (!iov)
4904                 return -ENOMEM;
4905
4906         memset(&rqst, 0, sizeof(struct smb_rqst));
4907         rqst.rq_iov = iov;
4908         rqst.rq_nvec = num;
4909
4910         rc = SMB2_set_info_init(tcon, server,
4911                                 &rqst, persistent_fid, volatile_fid, pid,
4912                                 info_class, info_type, additional_info,
4913                                 data, size);
4914         if (rc) {
4915                 kfree(iov);
4916                 return rc;
4917         }
4918
4919
4920         rc = cifs_send_recv(xid, ses, server,
4921                             &rqst, &resp_buftype, flags,
4922                             &rsp_iov);
4923         SMB2_set_info_free(&rqst);
4924         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4925
4926         if (rc != 0) {
4927                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4928                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4929                                 ses->Suid, info_class, (__u32)info_type, rc);
4930         }
4931
4932         free_rsp_buf(resp_buftype, rsp);
4933         kfree(iov);
4934         return rc;
4935 }
4936
4937 int
4938 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4939              u64 volatile_fid, u32 pid, __le64 *eof)
4940 {
4941         struct smb2_file_eof_info info;
4942         void *data;
4943         unsigned int size;
4944
4945         info.EndOfFile = *eof;
4946
4947         data = &info;
4948         size = sizeof(struct smb2_file_eof_info);
4949
4950         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4951                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4952                         0, 1, &data, &size);
4953 }
4954
4955 int
4956 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4957                 u64 persistent_fid, u64 volatile_fid,
4958                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4959 {
4960         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4961                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4962                         1, (void **)&pnntsd, &pacllen);
4963 }
4964
4965 int
4966 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4967             u64 persistent_fid, u64 volatile_fid,
4968             struct smb2_file_full_ea_info *buf, int len)
4969 {
4970         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4971                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4972                 0, 1, (void **)&buf, &len);
4973 }
4974
4975 int
4976 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4977                   const u64 persistent_fid, const u64 volatile_fid,
4978                   __u8 oplock_level)
4979 {
4980         struct smb_rqst rqst;
4981         int rc;
4982         struct smb2_oplock_break *req = NULL;
4983         struct cifs_ses *ses = tcon->ses;
4984         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4985         int flags = CIFS_OBREAK_OP;
4986         unsigned int total_len;
4987         struct kvec iov[1];
4988         struct kvec rsp_iov;
4989         int resp_buf_type;
4990
4991         cifs_dbg(FYI, "SMB2_oplock_break\n");
4992         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
4993                                  (void **) &req, &total_len);
4994         if (rc)
4995                 return rc;
4996
4997         if (smb3_encryption_required(tcon))
4998                 flags |= CIFS_TRANSFORM_REQ;
4999
5000         req->VolatileFid = volatile_fid;
5001         req->PersistentFid = persistent_fid;
5002         req->OplockLevel = oplock_level;
5003         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5004
5005         flags |= CIFS_NO_RSP_BUF;
5006
5007         iov[0].iov_base = (char *)req;
5008         iov[0].iov_len = total_len;
5009
5010         memset(&rqst, 0, sizeof(struct smb_rqst));
5011         rqst.rq_iov = iov;
5012         rqst.rq_nvec = 1;
5013
5014         rc = cifs_send_recv(xid, ses, server,
5015                             &rqst, &resp_buf_type, flags, &rsp_iov);
5016         cifs_small_buf_release(req);
5017
5018         if (rc) {
5019                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5020                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5021         }
5022
5023         return rc;
5024 }
5025
5026 void
5027 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5028                              struct kstatfs *kst)
5029 {
5030         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5031                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5032         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5033         kst->f_bfree  = kst->f_bavail =
5034                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5035         return;
5036 }
5037
5038 static void
5039 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5040                         struct kstatfs *kst)
5041 {
5042         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5043         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5044         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5045         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5046                 kst->f_bavail = kst->f_bfree;
5047         else
5048                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5049         if (response_data->TotalFileNodes != cpu_to_le64(-1))
5050                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5051         if (response_data->FreeFileNodes != cpu_to_le64(-1))
5052                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5053
5054         return;
5055 }
5056
5057 static int
5058 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5059                    struct TCP_Server_Info *server,
5060                    int level, int outbuf_len, u64 persistent_fid,
5061                    u64 volatile_fid)
5062 {
5063         int rc;
5064         struct smb2_query_info_req *req;
5065         unsigned int total_len;
5066
5067         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5068
5069         if ((tcon->ses == NULL) || server == NULL)
5070                 return -EIO;
5071
5072         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5073                                  (void **) &req, &total_len);
5074         if (rc)
5075                 return rc;
5076
5077         req->InfoType = SMB2_O_INFO_FILESYSTEM;
5078         req->FileInfoClass = level;
5079         req->PersistentFileId = persistent_fid;
5080         req->VolatileFileId = volatile_fid;
5081         /* 1 for pad */
5082         req->InputBufferOffset =
5083                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
5084         req->OutputBufferLength = cpu_to_le32(
5085                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
5086
5087         iov->iov_base = (char *)req;
5088         iov->iov_len = total_len;
5089         return 0;
5090 }
5091
5092 int
5093 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5094               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5095 {
5096         struct smb_rqst rqst;
5097         struct smb2_query_info_rsp *rsp = NULL;
5098         struct kvec iov;
5099         struct kvec rsp_iov;
5100         int rc = 0;
5101         int resp_buftype;
5102         struct cifs_ses *ses = tcon->ses;
5103         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5104         FILE_SYSTEM_POSIX_INFO *info = NULL;
5105         int flags = 0;
5106
5107         rc = build_qfs_info_req(&iov, tcon, server,
5108                                 FS_POSIX_INFORMATION,
5109                                 sizeof(FILE_SYSTEM_POSIX_INFO),
5110                                 persistent_fid, volatile_fid);
5111         if (rc)
5112                 return rc;
5113
5114         if (smb3_encryption_required(tcon))
5115                 flags |= CIFS_TRANSFORM_REQ;
5116
5117         memset(&rqst, 0, sizeof(struct smb_rqst));
5118         rqst.rq_iov = &iov;
5119         rqst.rq_nvec = 1;
5120
5121         rc = cifs_send_recv(xid, ses, server,
5122                             &rqst, &resp_buftype, flags, &rsp_iov);
5123         cifs_small_buf_release(iov.iov_base);
5124         if (rc) {
5125                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5126                 goto posix_qfsinf_exit;
5127         }
5128         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5129
5130         info = (FILE_SYSTEM_POSIX_INFO *)(
5131                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5132         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5133                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5134                                sizeof(FILE_SYSTEM_POSIX_INFO));
5135         if (!rc)
5136                 copy_posix_fs_info_to_kstatfs(info, fsdata);
5137
5138 posix_qfsinf_exit:
5139         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5140         return rc;
5141 }
5142
5143 int
5144 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5145               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5146 {
5147         struct smb_rqst rqst;
5148         struct smb2_query_info_rsp *rsp = NULL;
5149         struct kvec iov;
5150         struct kvec rsp_iov;
5151         int rc = 0;
5152         int resp_buftype;
5153         struct cifs_ses *ses = tcon->ses;
5154         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5155         struct smb2_fs_full_size_info *info = NULL;
5156         int flags = 0;
5157
5158         rc = build_qfs_info_req(&iov, tcon, server,
5159                                 FS_FULL_SIZE_INFORMATION,
5160                                 sizeof(struct smb2_fs_full_size_info),
5161                                 persistent_fid, volatile_fid);
5162         if (rc)
5163                 return rc;
5164
5165         if (smb3_encryption_required(tcon))
5166                 flags |= CIFS_TRANSFORM_REQ;
5167
5168         memset(&rqst, 0, sizeof(struct smb_rqst));
5169         rqst.rq_iov = &iov;
5170         rqst.rq_nvec = 1;
5171
5172         rc = cifs_send_recv(xid, ses, server,
5173                             &rqst, &resp_buftype, flags, &rsp_iov);
5174         cifs_small_buf_release(iov.iov_base);
5175         if (rc) {
5176                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5177                 goto qfsinf_exit;
5178         }
5179         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5180
5181         info = (struct smb2_fs_full_size_info *)(
5182                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5183         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5184                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5185                                sizeof(struct smb2_fs_full_size_info));
5186         if (!rc)
5187                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5188
5189 qfsinf_exit:
5190         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5191         return rc;
5192 }
5193
5194 int
5195 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5196               u64 persistent_fid, u64 volatile_fid, int level)
5197 {
5198         struct smb_rqst rqst;
5199         struct smb2_query_info_rsp *rsp = NULL;
5200         struct kvec iov;
5201         struct kvec rsp_iov;
5202         int rc = 0;
5203         int resp_buftype, max_len, min_len;
5204         struct cifs_ses *ses = tcon->ses;
5205         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5206         unsigned int rsp_len, offset;
5207         int flags = 0;
5208
5209         if (level == FS_DEVICE_INFORMATION) {
5210                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5211                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5212         } else if (level == FS_ATTRIBUTE_INFORMATION) {
5213                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5214                 min_len = MIN_FS_ATTR_INFO_SIZE;
5215         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5216                 max_len = sizeof(struct smb3_fs_ss_info);
5217                 min_len = sizeof(struct smb3_fs_ss_info);
5218         } else if (level == FS_VOLUME_INFORMATION) {
5219                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5220                 min_len = sizeof(struct smb3_fs_vol_info);
5221         } else {
5222                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5223                 return -EINVAL;
5224         }
5225
5226         rc = build_qfs_info_req(&iov, tcon, server,
5227                                 level, max_len,
5228                                 persistent_fid, volatile_fid);
5229         if (rc)
5230                 return rc;
5231
5232         if (smb3_encryption_required(tcon))
5233                 flags |= CIFS_TRANSFORM_REQ;
5234
5235         memset(&rqst, 0, sizeof(struct smb_rqst));
5236         rqst.rq_iov = &iov;
5237         rqst.rq_nvec = 1;
5238
5239         rc = cifs_send_recv(xid, ses, server,
5240                             &rqst, &resp_buftype, flags, &rsp_iov);
5241         cifs_small_buf_release(iov.iov_base);
5242         if (rc) {
5243                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5244                 goto qfsattr_exit;
5245         }
5246         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5247
5248         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5249         offset = le16_to_cpu(rsp->OutputBufferOffset);
5250         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5251         if (rc)
5252                 goto qfsattr_exit;
5253
5254         if (level == FS_ATTRIBUTE_INFORMATION)
5255                 memcpy(&tcon->fsAttrInfo, offset
5256                         + (char *)rsp, min_t(unsigned int,
5257                         rsp_len, max_len));
5258         else if (level == FS_DEVICE_INFORMATION)
5259                 memcpy(&tcon->fsDevInfo, offset
5260                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5261         else if (level == FS_SECTOR_SIZE_INFORMATION) {
5262                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5263                         (offset + (char *)rsp);
5264                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5265                 tcon->perf_sector_size =
5266                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5267         } else if (level == FS_VOLUME_INFORMATION) {
5268                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5269                         (offset + (char *)rsp);
5270                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5271                 tcon->vol_create_time = vol_info->VolumeCreationTime;
5272         }
5273
5274 qfsattr_exit:
5275         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5276         return rc;
5277 }
5278
5279 int
5280 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5281            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5282            const __u32 num_lock, struct smb2_lock_element *buf)
5283 {
5284         struct smb_rqst rqst;
5285         int rc = 0;
5286         struct smb2_lock_req *req = NULL;
5287         struct kvec iov[2];
5288         struct kvec rsp_iov;
5289         int resp_buf_type;
5290         unsigned int count;
5291         int flags = CIFS_NO_RSP_BUF;
5292         unsigned int total_len;
5293         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5294
5295         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
5296
5297         rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
5298                                  (void **) &req, &total_len);
5299         if (rc)
5300                 return rc;
5301
5302         if (smb3_encryption_required(tcon))
5303                 flags |= CIFS_TRANSFORM_REQ;
5304
5305         req->sync_hdr.ProcessId = cpu_to_le32(pid);
5306         req->LockCount = cpu_to_le16(num_lock);
5307
5308         req->PersistentFileId = persist_fid;
5309         req->VolatileFileId = volatile_fid;
5310
5311         count = num_lock * sizeof(struct smb2_lock_element);
5312
5313         iov[0].iov_base = (char *)req;
5314         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
5315         iov[1].iov_base = (char *)buf;
5316         iov[1].iov_len = count;
5317
5318         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
5319
5320         memset(&rqst, 0, sizeof(struct smb_rqst));
5321         rqst.rq_iov = iov;
5322         rqst.rq_nvec = 2;
5323
5324         rc = cifs_send_recv(xid, tcon->ses, server,
5325                             &rqst, &resp_buf_type, flags,
5326                             &rsp_iov);
5327         cifs_small_buf_release(req);
5328         if (rc) {
5329                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
5330                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
5331                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
5332                                     tcon->ses->Suid, rc);
5333         }
5334
5335         return rc;
5336 }
5337
5338 int
5339 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5340           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5341           const __u64 length, const __u64 offset, const __u32 lock_flags,
5342           const bool wait)
5343 {
5344         struct smb2_lock_element lock;
5345
5346         lock.Offset = cpu_to_le64(offset);
5347         lock.Length = cpu_to_le64(length);
5348         lock.Flags = cpu_to_le32(lock_flags);
5349         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5350                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5351
5352         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5353 }
5354
5355 int
5356 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5357                  __u8 *lease_key, const __le32 lease_state)
5358 {
5359         struct smb_rqst rqst;
5360         int rc;
5361         struct smb2_lease_ack *req = NULL;
5362         struct cifs_ses *ses = tcon->ses;
5363         int flags = CIFS_OBREAK_OP;
5364         unsigned int total_len;
5365         struct kvec iov[1];
5366         struct kvec rsp_iov;
5367         int resp_buf_type;
5368         __u64 *please_key_high;
5369         __u64 *please_key_low;
5370         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5371
5372         cifs_dbg(FYI, "SMB2_lease_break\n");
5373         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5374                                  (void **) &req, &total_len);
5375         if (rc)
5376                 return rc;
5377
5378         if (smb3_encryption_required(tcon))
5379                 flags |= CIFS_TRANSFORM_REQ;
5380
5381         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5382         req->StructureSize = cpu_to_le16(36);
5383         total_len += 12;
5384
5385         memcpy(req->LeaseKey, lease_key, 16);
5386         req->LeaseState = lease_state;
5387
5388         flags |= CIFS_NO_RSP_BUF;
5389
5390         iov[0].iov_base = (char *)req;
5391         iov[0].iov_len = total_len;
5392
5393         memset(&rqst, 0, sizeof(struct smb_rqst));
5394         rqst.rq_iov = iov;
5395         rqst.rq_nvec = 1;
5396
5397         rc = cifs_send_recv(xid, ses, server,
5398                             &rqst, &resp_buf_type, flags, &rsp_iov);
5399         cifs_small_buf_release(req);
5400
5401         please_key_low = (__u64 *)lease_key;
5402         please_key_high = (__u64 *)(lease_key+8);
5403         if (rc) {
5404                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5405                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5406                         ses->Suid, *please_key_low, *please_key_high, rc);
5407                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5408         } else
5409                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5410                         ses->Suid, *please_key_low, *please_key_high);
5411
5412         return rc;
5413 }