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                 } else if (rc) {
 285                         mutex_unlock(&ses->session_mutex);
 286                         goto out;
 287                 }
 288         }
 289         /*
 290          * End of channel binding
 291          */
 292         ses->binding = false;
 293         ses->binding_chan = NULL;
 294
 295         if (rc || !tcon->need_reconnect) {
 296                 mutex_unlock(&tcon->ses->session_mutex);
 297                 goto out;
 298         }
 299
 300         cifs_mark_open_files_invalid(tcon);
 301         if (tcon->use_persistent)
 302                 tcon->need_reopen_files = true;
 303
 304         rc = cifs_tree_connect(0, tcon, nls_codepage);
 305         mutex_unlock(&tcon->ses->session_mutex);
 306
 307         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 308         if (rc) {
 309                 /* If sess reconnected but tcon didn't, something strange ... */
 310                 pr_warn_once("reconnect tcon failed rc = %d\n", rc);
 311                 goto out;
 312         }
 313
 314         if (smb2_command != SMB2_INTERNAL_CMD)
 315                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
 316
 317         atomic_inc(&tconInfoReconnectCount);
 318 out:
 319         /*
 320          * Check if handle based operation so we know whether we can continue
 321          * or not without returning to caller to reset file handle.
 322          */
 323         /*
 324          * BB Is flush done by server on drop of tcp session? Should we special
 325          * case it and skip above?
 326          */
 327         switch (smb2_command) {
 328         case SMB2_FLUSH:
 329         case SMB2_READ:
 330         case SMB2_WRITE:
 331         case SMB2_LOCK:
 332         case SMB2_IOCTL:
 333         case SMB2_QUERY_DIRECTORY:
 334         case SMB2_CHANGE_NOTIFY:
 335         case SMB2_QUERY_INFO:
 336         case SMB2_SET_INFO:
 337                 rc = -EAGAIN;
 338         }
 339 failed:
 340         unload_nls(nls_codepage);
 341         return rc;
 342 }
 343
 344 static void
 345 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
 346                struct TCP_Server_Info *server,
 347                void *buf,
 348                unsigned int *total_len)
 349 {
 350         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 351         /* lookup word count ie StructureSize from table */
 352         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 353
 354         /*
 355          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 356          * largest operations (Create)
 357          */
 358         memset(buf, 0, 256);
 359
 360         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon, server);
 361         spdu->StructureSize2 = cpu_to_le16(parmsize);
 362
 363         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 364 }
 365
 366 /*
 367  * Allocate and return pointer to an SMB request hdr, and set basic
 368  * SMB information in the SMB header. If the return code is zero, this
 369  * function must have filled in request_buf pointer.
 370  */
 371 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 372                                  struct TCP_Server_Info *server,
 373                                  void **request_buf, unsigned int *total_len)
 374 {
 375         /* BB eventually switch this to SMB2 specific small buf size */
 376         switch (smb2_command) {
 377         case SMB2_SET_INFO:
 378         case SMB2_QUERY_INFO:
 379                 *request_buf = cifs_buf_get();
 380                 break;
 381         default:
 382                 *request_buf = cifs_small_buf_get();
 383                 break;
 384         }
 385         if (*request_buf == NULL) {
 386                 /* BB should we add a retry in here if not a writepage? */
 387                 return -ENOMEM;
 388         }
 389
 390         fill_small_buf(smb2_command, tcon, server,
 391                        (struct smb2_sync_hdr *)(*request_buf),
 392                        total_len);
 393
 394         if (tcon != NULL) {
 395                 uint16_t com_code = le16_to_cpu(smb2_command);
 396                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 397                 cifs_stats_inc(&tcon->num_smbs_sent);
 398         }
 399
 400         return 0;
 401 }
 402
 403 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 404                                struct TCP_Server_Info *server,
 405                                void **request_buf, unsigned int *total_len)
 406 {
 407         int rc;
 408
 409         rc = smb2_reconnect(smb2_command, tcon, server);
 410         if (rc)
 411                 return rc;
 412
 413         return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
 414                                      total_len);
 415 }
 416
 417 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 418                                struct TCP_Server_Info *server,
 419                                void **request_buf, unsigned int *total_len)
 420 {
 421         /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
 422         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
 423                 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 424                                              request_buf, total_len);
 425         }
 426         return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 427                                    request_buf, total_len);
 428 }
 429
 430 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 431
 432 static void
 433 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 434 {
 435         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 436         pneg_ctxt->DataLength = cpu_to_le16(38);
 437         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 438         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_LINUX_CLIENT_SALT_SIZE);
 439         get_random_bytes(pneg_ctxt->Salt, SMB311_LINUX_CLIENT_SALT_SIZE);
 440         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 441 }
 442
 443 static void
 444 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 445 {
 446         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 447         pneg_ctxt->DataLength =
 448                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 449                           - sizeof(struct smb2_neg_context));
 450         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 451         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 452         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 453         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 454 }
 455
 456 static void
 457 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 458 {
 459         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 460         if (require_gcm_256) {
 461                 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
 462                 pneg_ctxt->CipherCount = cpu_to_le16(1);
 463                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
 464         } else if (enable_gcm_256) {
 465                 pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
 466                 pneg_ctxt->CipherCount = cpu_to_le16(3);
 467                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 468                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
 469                 pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
 470         } else {
 471                 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
 472                 pneg_ctxt->CipherCount = cpu_to_le16(2);
 473                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 474                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 475         }
 476 }
 477
 478 static unsigned int
 479 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 480 {
 481         struct nls_table *cp = load_nls_default();
 482
 483         pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 484
 485         /* copy up to max of first 100 bytes of server name to NetName field */
 486         pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 487         /* context size is DataLength + minimal smb2_neg_context */
 488         return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
 489                         sizeof(struct smb2_neg_context), 8) * 8;
 490 }
 491
 492 static void
 493 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 494 {
 495         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 496         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 497         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 498         pneg_ctxt->Name[0] = 0x93;
 499         pneg_ctxt->Name[1] = 0xAD;
 500         pneg_ctxt->Name[2] = 0x25;
 501         pneg_ctxt->Name[3] = 0x50;
 502         pneg_ctxt->Name[4] = 0x9C;
 503         pneg_ctxt->Name[5] = 0xB4;
 504         pneg_ctxt->Name[6] = 0x11;
 505         pneg_ctxt->Name[7] = 0xE7;
 506         pneg_ctxt->Name[8] = 0xB4;
 507         pneg_ctxt->Name[9] = 0x23;
 508         pneg_ctxt->Name[10] = 0x83;
 509         pneg_ctxt->Name[11] = 0xDE;
 510         pneg_ctxt->Name[12] = 0x96;
 511         pneg_ctxt->Name[13] = 0x8B;
 512         pneg_ctxt->Name[14] = 0xCD;
 513         pneg_ctxt->Name[15] = 0x7C;
 514 }
 515
 516 static void
 517 assemble_neg_contexts(struct smb2_negotiate_req *req,
 518                       struct TCP_Server_Info *server, unsigned int *total_len)
 519 {
 520         char *pneg_ctxt;
 521         unsigned int ctxt_len;
 522
 523         if (*total_len > 200) {
 524                 /* In case length corrupted don't want to overrun smb buffer */
 525                 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 526                 return;
 527         }
 528
 529         /*
 530          * round up total_len of fixed part of SMB3 negotiate request to 8
 531          * byte boundary before adding negotiate contexts
 532          */
 533         *total_len = roundup(*total_len, 8);
 534
 535         pneg_ctxt = (*total_len) + (char *)req;
 536         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 537
 538         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 539         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 540         *total_len += ctxt_len;
 541         pneg_ctxt += ctxt_len;
 542
 543         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 544         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 545         *total_len += ctxt_len;
 546         pneg_ctxt += ctxt_len;
 547
 548         if (server->compress_algorithm) {
 549                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 550                                 pneg_ctxt);
 551                 ctxt_len = DIV_ROUND_UP(
 552                         sizeof(struct smb2_compression_capabilities_context),
 553                                 8) * 8;
 554                 *total_len += ctxt_len;
 555                 pneg_ctxt += ctxt_len;
 556                 req->NegotiateContextCount = cpu_to_le16(5);
 557         } else
 558                 req->NegotiateContextCount = cpu_to_le16(4);
 559
 560         ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 561                                         server->hostname);
 562         *total_len += ctxt_len;
 563         pneg_ctxt += ctxt_len;
 564
 565         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 566         *total_len += sizeof(struct smb2_posix_neg_context);
 567 }
 568
 569 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 570 {
 571         unsigned int len = le16_to_cpu(ctxt->DataLength);
 572
 573         /* If invalid preauth context warn but use what we requested, SHA-512 */
 574         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 575                 pr_warn_once("server sent bad preauth context\n");
 576                 return;
 577         } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
 578                 pr_warn_once("server sent invalid SaltLength\n");
 579                 return;
 580         }
 581         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 582                 pr_warn_once("Invalid SMB3 hash algorithm count\n");
 583         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 584                 pr_warn_once("unknown SMB3 hash algorithm\n");
 585 }
 586
 587 static void decode_compress_ctx(struct TCP_Server_Info *server,
 588                          struct smb2_compression_capabilities_context *ctxt)
 589 {
 590         unsigned int len = le16_to_cpu(ctxt->DataLength);
 591
 592         /* sizeof compress context is a one element compression capbility struct */
 593         if (len < 10) {
 594                 pr_warn_once("server sent bad compression cntxt\n");
 595                 return;
 596         }
 597         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 598                 pr_warn_once("Invalid SMB3 compress algorithm count\n");
 599                 return;
 600         }
 601         if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 602                 pr_warn_once("unknown compression algorithm\n");
 603                 return;
 604         }
 605         server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 606 }
 607
 608 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 609                               struct smb2_encryption_neg_context *ctxt)
 610 {
 611         unsigned int len = le16_to_cpu(ctxt->DataLength);
 612
 613         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 614         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 615                 pr_warn_once("server sent bad crypto ctxt len\n");
 616                 return -EINVAL;
 617         }
 618
 619         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 620                 pr_warn_once("Invalid SMB3.11 cipher count\n");
 621                 return -EINVAL;
 622         }
 623         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 624         if (require_gcm_256) {
 625                 if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
 626                         cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
 627                         return -EOPNOTSUPP;
 628                 }
 629         } else if (ctxt->Ciphers[0] == 0) {
 630                 /*
 631                  * e.g. if server only supported AES256_CCM (very unlikely)
 632                  * or server supported no encryption types or had all disabled.
 633                  * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
 634                  * in which mount requested encryption ("seal") checks later
 635                  * on during tree connection will return proper rc, but if
 636                  * seal not requested by client, since server is allowed to
 637                  * return 0 to indicate no supported cipher, we can't fail here
 638                  */
 639                 server->cipher_type = 0;
 640                 server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
 641                 pr_warn_once("Server does not support requested encryption types\n");
 642                 return 0;
 643         } else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 644                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
 645                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
 646                 /* server returned a cipher we didn't ask for */
 647                 pr_warn_once("Invalid SMB3.11 cipher returned\n");
 648                 return -EINVAL;
 649         }
 650         server->cipher_type = ctxt->Ciphers[0];
 651         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 652         return 0;
 653 }
 654
 655 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 656                                      struct TCP_Server_Info *server,
 657                                      unsigned int len_of_smb)
 658 {
 659         struct smb2_neg_context *pctx;
 660         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 661         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 662         unsigned int len_of_ctxts, i;
 663         int rc = 0;
 664
 665         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 666         if (len_of_smb <= offset) {
 667                 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 668                 return -EINVAL;
 669         }
 670
 671         len_of_ctxts = len_of_smb - offset;
 672
 673         for (i = 0; i < ctxt_cnt; i++) {
 674                 int clen;
 675                 /* check that offset is not beyond end of SMB */
 676                 if (len_of_ctxts == 0)
 677                         break;
 678
 679                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 680                         break;
 681
 682                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 683                 clen = le16_to_cpu(pctx->DataLength);
 684                 if (clen > len_of_ctxts)
 685                         break;
 686
 687                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 688                         decode_preauth_context(
 689                                 (struct smb2_preauth_neg_context *)pctx);
 690                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 691                         rc = decode_encrypt_ctx(server,
 692                                 (struct smb2_encryption_neg_context *)pctx);
 693                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 694                         decode_compress_ctx(server,
 695                                 (struct smb2_compression_capabilities_context *)pctx);
 696                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 697                         server->posix_ext_supported = true;
 698                 else
 699                         cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 700                                 le16_to_cpu(pctx->ContextType));
 701
 702                 if (rc)
 703                         break;
 704                 /* offsets must be 8 byte aligned */
 705                 clen = (clen + 7) & ~0x7;
 706                 offset += clen + sizeof(struct smb2_neg_context);
 707                 len_of_ctxts -= clen;
 708         }
 709         return rc;
 710 }
 711
 712 static struct create_posix *
 713 create_posix_buf(umode_t mode)
 714 {
 715         struct create_posix *buf;
 716
 717         buf = kzalloc(sizeof(struct create_posix),
 718                         GFP_KERNEL);
 719         if (!buf)
 720                 return NULL;
 721
 722         buf->ccontext.DataOffset =
 723                 cpu_to_le16(offsetof(struct create_posix, Mode));
 724         buf->ccontext.DataLength = cpu_to_le32(4);
 725         buf->ccontext.NameOffset =
 726                 cpu_to_le16(offsetof(struct create_posix, Name));
 727         buf->ccontext.NameLength = cpu_to_le16(16);
 728
 729         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 730         buf->Name[0] = 0x93;
 731         buf->Name[1] = 0xAD;
 732         buf->Name[2] = 0x25;
 733         buf->Name[3] = 0x50;
 734         buf->Name[4] = 0x9C;
 735         buf->Name[5] = 0xB4;
 736         buf->Name[6] = 0x11;
 737         buf->Name[7] = 0xE7;
 738         buf->Name[8] = 0xB4;
 739         buf->Name[9] = 0x23;
 740         buf->Name[10] = 0x83;
 741         buf->Name[11] = 0xDE;
 742         buf->Name[12] = 0x96;
 743         buf->Name[13] = 0x8B;
 744         buf->Name[14] = 0xCD;
 745         buf->Name[15] = 0x7C;
 746         buf->Mode = cpu_to_le32(mode);
 747         cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
 748         return buf;
 749 }
 750
 751 static int
 752 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 753 {
 754         struct smb2_create_req *req = iov[0].iov_base;
 755         unsigned int num = *num_iovec;
 756
 757         iov[num].iov_base = create_posix_buf(mode);
 758         if (mode == ACL_NO_MODE)
 759                 cifs_dbg(FYI, "Invalid mode\n");
 760         if (iov[num].iov_base == NULL)
 761                 return -ENOMEM;
 762         iov[num].iov_len = sizeof(struct create_posix);
 763         if (!req->CreateContextsOffset)
 764                 req->CreateContextsOffset = cpu_to_le32(
 765                                 sizeof(struct smb2_create_req) +
 766                                 iov[num - 1].iov_len);
 767         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 768         *num_iovec = num + 1;
 769         return 0;
 770 }
 771
 772
 773 /*
 774  *
 775  *      SMB2 Worker functions follow:
 776  *
 777  *      The general structure of the worker functions is:
 778  *      1) Call smb2_init (assembles SMB2 header)
 779  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 780  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 781  *      4) Decode SMB2 command specific fields in the fixed length area
 782  *      5) Decode variable length data area (if any for this SMB2 command type)
 783  *      6) Call free smb buffer
 784  *      7) return
 785  *
 786  */
 787
 788 int
 789 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 790 {
 791         struct smb_rqst rqst;
 792         struct smb2_negotiate_req *req;
 793         struct smb2_negotiate_rsp *rsp;
 794         struct kvec iov[1];
 795         struct kvec rsp_iov;
 796         int rc = 0;
 797         int resp_buftype;
 798         struct TCP_Server_Info *server = cifs_ses_server(ses);
 799         int blob_offset, blob_length;
 800         char *security_blob;
 801         int flags = CIFS_NEG_OP;
 802         unsigned int total_len;
 803
 804         cifs_dbg(FYI, "Negotiate protocol\n");
 805
 806         if (!server) {
 807                 WARN(1, "%s: server is NULL!\n", __func__);
 808                 return -EIO;
 809         }
 810
 811         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
 812                                  (void **) &req, &total_len);
 813         if (rc)
 814                 return rc;
 815
 816         req->sync_hdr.SessionId = 0;
 817
 818         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 819         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 820
 821         if (strcmp(server->vals->version_string,
 822                    SMB3ANY_VERSION_STRING) == 0) {
 823                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 824                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 825                 req->DialectCount = cpu_to_le16(2);
 826                 total_len += 4;
 827         } else if (strcmp(server->vals->version_string,
 828                    SMBDEFAULT_VERSION_STRING) == 0) {
 829                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 830                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 831                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 832                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 833                 req->DialectCount = cpu_to_le16(4);
 834                 total_len += 8;
 835         } else {
 836                 /* otherwise send specific dialect */
 837                 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
 838                 req->DialectCount = cpu_to_le16(1);
 839                 total_len += 2;
 840         }
 841
 842         /* only one of SMB2 signing flags may be set in SMB2 request */
 843         if (ses->sign)
 844                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 845         else if (global_secflags & CIFSSEC_MAY_SIGN)
 846                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 847         else
 848                 req->SecurityMode = 0;
 849
 850         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
 851         if (ses->chan_max > 1)
 852                 req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
 853
 854         /* ClientGUID must be zero for SMB2.02 dialect */
 855         if (server->vals->protocol_id == SMB20_PROT_ID)
 856                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 857         else {
 858                 memcpy(req->ClientGUID, server->client_guid,
 859                         SMB2_CLIENT_GUID_SIZE);
 860                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
 861                     (strcmp(server->vals->version_string,
 862                      SMBDEFAULT_VERSION_STRING) == 0))
 863                         assemble_neg_contexts(req, server, &total_len);
 864         }
 865         iov[0].iov_base = (char *)req;
 866         iov[0].iov_len = total_len;
 867
 868         memset(&rqst, 0, sizeof(struct smb_rqst));
 869         rqst.rq_iov = iov;
 870         rqst.rq_nvec = 1;
 871
 872         rc = cifs_send_recv(xid, ses, server,
 873                             &rqst, &resp_buftype, flags, &rsp_iov);
 874         cifs_small_buf_release(req);
 875         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 876         /*
 877          * No tcon so can't do
 878          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 879          */
 880         if (rc == -EOPNOTSUPP) {
 881                 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");
 882                 goto neg_exit;
 883         } else if (rc != 0)
 884                 goto neg_exit;
 885
 886         if (strcmp(server->vals->version_string,
 887                    SMB3ANY_VERSION_STRING) == 0) {
 888                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 889                         cifs_server_dbg(VFS,
 890                                 "SMB2 dialect returned but not requested\n");
 891                         return -EIO;
 892                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 893                         cifs_server_dbg(VFS,
 894                                 "SMB2.1 dialect returned but not requested\n");
 895                         return -EIO;
 896                 }
 897         } else if (strcmp(server->vals->version_string,
 898                    SMBDEFAULT_VERSION_STRING) == 0) {
 899                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 900                         cifs_server_dbg(VFS,
 901                                 "SMB2 dialect returned but not requested\n");
 902                         return -EIO;
 903                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 904                         /* ops set to 3.0 by default for default so update */
 905                         server->ops = &smb21_operations;
 906                         server->vals = &smb21_values;
 907                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 908                         server->ops = &smb311_operations;
 909                         server->vals = &smb311_values;
 910                 }
 911         } else if (le16_to_cpu(rsp->DialectRevision) !=
 912                                 server->vals->protocol_id) {
 913                 /* if requested single dialect ensure returned dialect matched */
 914                 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
 915                                 le16_to_cpu(rsp->DialectRevision));
 916                 return -EIO;
 917         }
 918
 919         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 920
 921         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 922                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 923         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 924                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 925         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 926                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 927         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 928                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 929         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 930                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 931         else {
 932                 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
 933                                 le16_to_cpu(rsp->DialectRevision));
 934                 rc = -EIO;
 935                 goto neg_exit;
 936         }
 937         server->dialect = le16_to_cpu(rsp->DialectRevision);
 938
 939         /*
 940          * Keep a copy of the hash after negprot. This hash will be
 941          * the starting hash value for all sessions made from this
 942          * server.
 943          */
 944         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 945                SMB2_PREAUTH_HASH_SIZE);
 946
 947         /* SMB2 only has an extended negflavor */
 948         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 949         /* set it to the maximum buffer size value we can send with 1 credit */
 950         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 951                                SMB2_MAX_BUFFER_SIZE);
 952         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 953         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 954         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 955         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 956                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 957                                 server->sec_mode);
 958         server->capabilities = le32_to_cpu(rsp->Capabilities);
 959         /* Internal types */
 960         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 961
 962         /*
 963          * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context
 964          * Set the cipher type manually.
 965          */
 966         if (server->dialect == SMB30_PROT_ID && (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
 967                 server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
 968
 969         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 970                                                (struct smb2_sync_hdr *)rsp);
 971         /*
 972          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 973          * for us will be
 974          *      ses->sectype = RawNTLMSSP;
 975          * but for time being this is our only auth choice so doesn't matter.
 976          * We just found a server which sets blob length to zero expecting raw.
 977          */
 978         if (blob_length == 0) {
 979                 cifs_dbg(FYI, "missing security blob on negprot\n");
 980                 server->sec_ntlmssp = true;
 981         }
 982
 983         rc = cifs_enable_signing(server, ses->sign);
 984         if (rc)
 985                 goto neg_exit;
 986         if (blob_length) {
 987                 rc = decode_negTokenInit(security_blob, blob_length, server);
 988                 if (rc == 1)
 989                         rc = 0;
 990                 else if (rc == 0)
 991                         rc = -EIO;
 992         }
 993
 994         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 995                 if (rsp->NegotiateContextCount)
 996                         rc = smb311_decode_neg_context(rsp, server,
 997                                                        rsp_iov.iov_len);
 998                 else
 999                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
1000         }
1001 neg_exit:
1002         free_rsp_buf(resp_buftype, rsp);
1003         return rc;
1004 }
1005
1006 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1007 {
1008         int rc;
1009         struct validate_negotiate_info_req *pneg_inbuf;
1010         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1011         u32 rsplen;
1012         u32 inbuflen; /* max of 4 dialects */
1013         struct TCP_Server_Info *server = tcon->ses->server;
1014
1015         cifs_dbg(FYI, "validate negotiate\n");
1016
1017         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1018         if (server->dialect == SMB311_PROT_ID)
1019                 return 0;
1020
1021         /*
1022          * validation ioctl must be signed, so no point sending this if we
1023          * can not sign it (ie are not known user).  Even if signing is not
1024          * required (enabled but not negotiated), in those cases we selectively
1025          * sign just this, the first and only signed request on a connection.
1026          * Having validation of negotiate info  helps reduce attack vectors.
1027          */
1028         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1029                 return 0; /* validation requires signing */
1030
1031         if (tcon->ses->user_name == NULL) {
1032                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1033                 return 0; /* validation requires signing */
1034         }
1035
1036         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1037                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1038
1039         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1040         if (!pneg_inbuf)
1041                 return -ENOMEM;
1042
1043         pneg_inbuf->Capabilities =
1044                         cpu_to_le32(server->vals->req_capabilities);
1045         if (tcon->ses->chan_max > 1)
1046                 pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1047
1048         memcpy(pneg_inbuf->Guid, server->client_guid,
1049                                         SMB2_CLIENT_GUID_SIZE);
1050
1051         if (tcon->ses->sign)
1052                 pneg_inbuf->SecurityMode =
1053                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1054         else if (global_secflags & CIFSSEC_MAY_SIGN)
1055                 pneg_inbuf->SecurityMode =
1056                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1057         else
1058                 pneg_inbuf->SecurityMode = 0;
1059
1060
1061         if (strcmp(server->vals->version_string,
1062                 SMB3ANY_VERSION_STRING) == 0) {
1063                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1064                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1065                 pneg_inbuf->DialectCount = cpu_to_le16(2);
1066                 /* structure is big enough for 3 dialects, sending only 2 */
1067                 inbuflen = sizeof(*pneg_inbuf) -
1068                                 (2 * sizeof(pneg_inbuf->Dialects[0]));
1069         } else if (strcmp(server->vals->version_string,
1070                 SMBDEFAULT_VERSION_STRING) == 0) {
1071                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1072                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1073                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1074                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1075                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1076                 /* structure is big enough for 3 dialects */
1077                 inbuflen = sizeof(*pneg_inbuf);
1078         } else {
1079                 /* otherwise specific dialect was requested */
1080                 pneg_inbuf->Dialects[0] =
1081                         cpu_to_le16(server->vals->protocol_id);
1082                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1083                 /* structure is big enough for 4 dialects, sending only 1 */
1084                 inbuflen = sizeof(*pneg_inbuf) -
1085                                 sizeof(pneg_inbuf->Dialects[0]) * 3;
1086         }
1087
1088         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1089                 FSCTL_VALIDATE_NEGOTIATE_INFO,
1090                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1091                 (char **)&pneg_rsp, &rsplen);
1092         if (rc == -EOPNOTSUPP) {
1093                 /*
1094                  * Old Windows versions or Netapp SMB server can return
1095                  * not supported error. Client should accept it.
1096                  */
1097                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1098                 rc = 0;
1099                 goto out_free_inbuf;
1100         } else if (rc != 0) {
1101                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1102                               rc);
1103                 rc = -EIO;
1104                 goto out_free_inbuf;
1105         }
1106
1107         rc = -EIO;
1108         if (rsplen != sizeof(*pneg_rsp)) {
1109                 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1110                               rsplen);
1111
1112                 /* relax check since Mac returns max bufsize allowed on ioctl */
1113                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1114                         goto out_free_rsp;
1115         }
1116
1117         /* check validate negotiate info response matches what we got earlier */
1118         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1119                 goto vneg_out;
1120
1121         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1122                 goto vneg_out;
1123
1124         /* do not validate server guid because not saved at negprot time yet */
1125
1126         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1127               SMB2_LARGE_FILES) != server->capabilities)
1128                 goto vneg_out;
1129
1130         /* validate negotiate successful */
1131         rc = 0;
1132         cifs_dbg(FYI, "validate negotiate info successful\n");
1133         goto out_free_rsp;
1134
1135 vneg_out:
1136         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1137 out_free_rsp:
1138         kfree(pneg_rsp);
1139 out_free_inbuf:
1140         kfree(pneg_inbuf);
1141         return rc;
1142 }
1143
1144 enum securityEnum
1145 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1146 {
1147         switch (requested) {
1148         case Kerberos:
1149         case RawNTLMSSP:
1150                 return requested;
1151         case NTLMv2:
1152                 return RawNTLMSSP;
1153         case Unspecified:
1154                 if (server->sec_ntlmssp &&
1155                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1156                         return RawNTLMSSP;
1157                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1158                         (global_secflags & CIFSSEC_MAY_KRB5))
1159                         return Kerberos;
1160                 fallthrough;
1161         default:
1162                 return Unspecified;
1163         }
1164 }
1165
1166 struct SMB2_sess_data {
1167         unsigned int xid;
1168         struct cifs_ses *ses;
1169         struct nls_table *nls_cp;
1170         void (*func)(struct SMB2_sess_data *);
1171         int result;
1172         u64 previous_session;
1173
1174         /* we will send the SMB in three pieces:
1175          * a fixed length beginning part, an optional
1176          * SPNEGO blob (which can be zero length), and a
1177          * last part which will include the strings
1178          * and rest of bcc area. This allows us to avoid
1179          * a large buffer 17K allocation
1180          */
1181         int buf0_type;
1182         struct kvec iov[2];
1183 };
1184
1185 static int
1186 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1187 {
1188         int rc;
1189         struct cifs_ses *ses = sess_data->ses;
1190         struct smb2_sess_setup_req *req;
1191         struct TCP_Server_Info *server = cifs_ses_server(ses);
1192         unsigned int total_len;
1193
1194         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1195                                  (void **) &req,
1196                                  &total_len);
1197         if (rc)
1198                 return rc;
1199
1200         if (sess_data->ses->binding) {
1201                 req->sync_hdr.SessionId = sess_data->ses->Suid;
1202                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1203                 req->PreviousSessionId = 0;
1204                 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1205         } else {
1206                 /* First session, not a reauthenticate */
1207                 req->sync_hdr.SessionId = 0;
1208                 /*
1209                  * if reconnect, we need to send previous sess id
1210                  * otherwise it is 0
1211                  */
1212                 req->PreviousSessionId = sess_data->previous_session;
1213                 req->Flags = 0; /* MBZ */
1214         }
1215
1216         /* enough to enable echos and oplocks and one max size write */
1217         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1218
1219         /* only one of SMB2 signing flags may be set in SMB2 request */
1220         if (server->sign)
1221                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1222         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1223                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1224         else
1225                 req->SecurityMode = 0;
1226
1227 #ifdef CONFIG_CIFS_DFS_UPCALL
1228         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1229 #else
1230         req->Capabilities = 0;
1231 #endif /* DFS_UPCALL */
1232
1233         req->Channel = 0; /* MBZ */
1234
1235         sess_data->iov[0].iov_base = (char *)req;
1236         /* 1 for pad */
1237         sess_data->iov[0].iov_len = total_len - 1;
1238         /*
1239          * This variable will be used to clear the buffer
1240          * allocated above in case of any error in the calling function.
1241          */
1242         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1243
1244         return 0;
1245 }
1246
1247 static void
1248 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1249 {
1250         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1251         sess_data->buf0_type = CIFS_NO_BUFFER;
1252 }
1253
1254 static int
1255 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1256 {
1257         int rc;
1258         struct smb_rqst rqst;
1259         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1260         struct kvec rsp_iov = { NULL, 0 };
1261
1262         /* Testing shows that buffer offset must be at location of Buffer[0] */
1263         req->SecurityBufferOffset =
1264                 cpu_to_le16(sizeof(struct smb2_sess_setup_req));
1265         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1266
1267         memset(&rqst, 0, sizeof(struct smb_rqst));
1268         rqst.rq_iov = sess_data->iov;
1269         rqst.rq_nvec = 2;
1270
1271         /* BB add code to build os and lm fields */
1272         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1273                             cifs_ses_server(sess_data->ses),
1274                             &rqst,
1275                             &sess_data->buf0_type,
1276                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1277         cifs_small_buf_release(sess_data->iov[0].iov_base);
1278         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1279
1280         return rc;
1281 }
1282
1283 static int
1284 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1285 {
1286         int rc = 0;
1287         struct cifs_ses *ses = sess_data->ses;
1288         struct TCP_Server_Info *server = cifs_ses_server(ses);
1289
1290         mutex_lock(&server->srv_mutex);
1291         if (server->ops->generate_signingkey) {
1292                 rc = server->ops->generate_signingkey(ses);
1293                 if (rc) {
1294                         cifs_dbg(FYI,
1295                                 "SMB3 session key generation failed\n");
1296                         mutex_unlock(&server->srv_mutex);
1297                         return rc;
1298                 }
1299         }
1300         if (!server->session_estab) {
1301                 server->sequence_number = 0x2;
1302                 server->session_estab = true;
1303         }
1304         mutex_unlock(&server->srv_mutex);
1305
1306         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1307         /* keep existing ses state if binding */
1308         if (!ses->binding) {
1309                 spin_lock(&GlobalMid_Lock);
1310                 ses->status = CifsGood;
1311                 ses->need_reconnect = false;
1312                 spin_unlock(&GlobalMid_Lock);
1313         }
1314
1315         return rc;
1316 }
1317
1318 #ifdef CONFIG_CIFS_UPCALL
1319 static void
1320 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1321 {
1322         int rc;
1323         struct cifs_ses *ses = sess_data->ses;
1324         struct cifs_spnego_msg *msg;
1325         struct key *spnego_key = NULL;
1326         struct smb2_sess_setup_rsp *rsp = NULL;
1327
1328         rc = SMB2_sess_alloc_buffer(sess_data);
1329         if (rc)
1330                 goto out;
1331
1332         spnego_key = cifs_get_spnego_key(ses);
1333         if (IS_ERR(spnego_key)) {
1334                 rc = PTR_ERR(spnego_key);
1335                 if (rc == -ENOKEY)
1336                         cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1337                 spnego_key = NULL;
1338                 goto out;
1339         }
1340
1341         msg = spnego_key->payload.data[0];
1342         /*
1343          * check version field to make sure that cifs.upcall is
1344          * sending us a response in an expected form
1345          */
1346         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1347                 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1348                          CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1349                 rc = -EKEYREJECTED;
1350                 goto out_put_spnego_key;
1351         }
1352
1353         /* keep session key if binding */
1354         if (!ses->binding) {
1355                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1356                                                  GFP_KERNEL);
1357                 if (!ses->auth_key.response) {
1358                         cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1359                                  msg->sesskey_len);
1360                         rc = -ENOMEM;
1361                         goto out_put_spnego_key;
1362                 }
1363                 ses->auth_key.len = msg->sesskey_len;
1364         }
1365
1366         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1367         sess_data->iov[1].iov_len = msg->secblob_len;
1368
1369         rc = SMB2_sess_sendreceive(sess_data);
1370         if (rc)
1371                 goto out_put_spnego_key;
1372
1373         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1374         /* keep session id and flags if binding */
1375         if (!ses->binding) {
1376                 ses->Suid = rsp->sync_hdr.SessionId;
1377                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1378         }
1379
1380         rc = SMB2_sess_establish_session(sess_data);
1381 out_put_spnego_key:
1382         key_invalidate(spnego_key);
1383         key_put(spnego_key);
1384 out:
1385         sess_data->result = rc;
1386         sess_data->func = NULL;
1387         SMB2_sess_free_buffer(sess_data);
1388 }
1389 #else
1390 static void
1391 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1392 {
1393         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1394         sess_data->result = -EOPNOTSUPP;
1395         sess_data->func = NULL;
1396 }
1397 #endif
1398
1399 static void
1400 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1401
1402 static void
1403 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1404 {
1405         int rc;
1406         struct cifs_ses *ses = sess_data->ses;
1407         struct smb2_sess_setup_rsp *rsp = NULL;
1408         char *ntlmssp_blob = NULL;
1409         bool use_spnego = false; /* else use raw ntlmssp */
1410         u16 blob_length = 0;
1411
1412         /*
1413          * If memory allocation is successful, caller of this function
1414          * frees it.
1415          */
1416         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1417         if (!ses->ntlmssp) {
1418                 rc = -ENOMEM;
1419                 goto out_err;
1420         }
1421         ses->ntlmssp->sesskey_per_smbsess = true;
1422
1423         rc = SMB2_sess_alloc_buffer(sess_data);
1424         if (rc)
1425                 goto out_err;
1426
1427         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1428                                GFP_KERNEL);
1429         if (ntlmssp_blob == NULL) {
1430                 rc = -ENOMEM;
1431                 goto out;
1432         }
1433
1434         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1435         if (use_spnego) {
1436                 /* BB eventually need to add this */
1437                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1438                 rc = -EOPNOTSUPP;
1439                 goto out;
1440         } else {
1441                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1442                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1443         }
1444         sess_data->iov[1].iov_base = ntlmssp_blob;
1445         sess_data->iov[1].iov_len = blob_length;
1446
1447         rc = SMB2_sess_sendreceive(sess_data);
1448         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1449
1450         /* If true, rc here is expected and not an error */
1451         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1452                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1453                 rc = 0;
1454
1455         if (rc)
1456                 goto out;
1457
1458         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1459                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1460                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1461                         le16_to_cpu(rsp->SecurityBufferOffset));
1462                 rc = -EIO;
1463                 goto out;
1464         }
1465         rc = decode_ntlmssp_challenge(rsp->Buffer,
1466                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1467         if (rc)
1468                 goto out;
1469
1470         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1471
1472         /* keep existing ses id and flags if binding */
1473         if (!ses->binding) {
1474                 ses->Suid = rsp->sync_hdr.SessionId;
1475                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1476         }
1477
1478 out:
1479         kfree(ntlmssp_blob);
1480         SMB2_sess_free_buffer(sess_data);
1481         if (!rc) {
1482                 sess_data->result = 0;
1483                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1484                 return;
1485         }
1486 out_err:
1487         kfree(ses->ntlmssp);
1488         ses->ntlmssp = NULL;
1489         sess_data->result = rc;
1490         sess_data->func = NULL;
1491 }
1492
1493 static void
1494 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1495 {
1496         int rc;
1497         struct cifs_ses *ses = sess_data->ses;
1498         struct smb2_sess_setup_req *req;
1499         struct smb2_sess_setup_rsp *rsp = NULL;
1500         unsigned char *ntlmssp_blob = NULL;
1501         bool use_spnego = false; /* else use raw ntlmssp */
1502         u16 blob_length = 0;
1503
1504         rc = SMB2_sess_alloc_buffer(sess_data);
1505         if (rc)
1506                 goto out;
1507
1508         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1509         req->sync_hdr.SessionId = ses->Suid;
1510
1511         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1512                                         sess_data->nls_cp);
1513         if (rc) {
1514                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1515                 goto out;
1516         }
1517
1518         if (use_spnego) {
1519                 /* BB eventually need to add this */
1520                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1521                 rc = -EOPNOTSUPP;
1522                 goto out;
1523         }
1524         sess_data->iov[1].iov_base = ntlmssp_blob;
1525         sess_data->iov[1].iov_len = blob_length;
1526
1527         rc = SMB2_sess_sendreceive(sess_data);
1528         if (rc)
1529                 goto out;
1530
1531         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1532
1533         /* keep existing ses id and flags if binding */
1534         if (!ses->binding) {
1535                 ses->Suid = rsp->sync_hdr.SessionId;
1536                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1537         }
1538
1539         rc = SMB2_sess_establish_session(sess_data);
1540 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1541         if (ses->server->dialect < SMB30_PROT_ID) {
1542                 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1543                 /*
1544                  * The session id is opaque in terms of endianness, so we can't
1545                  * print it as a long long. we dump it as we got it on the wire
1546                  */
1547                 cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1548                          &ses->Suid);
1549                 cifs_dbg(VFS, "Session Key   %*ph\n",
1550                          SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1551                 cifs_dbg(VFS, "Signing Key   %*ph\n",
1552                          SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1553         }
1554 #endif
1555 out:
1556         kfree(ntlmssp_blob);
1557         SMB2_sess_free_buffer(sess_data);
1558         kfree(ses->ntlmssp);
1559         ses->ntlmssp = NULL;
1560         sess_data->result = rc;
1561         sess_data->func = NULL;
1562 }
1563
1564 static int
1565 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1566 {
1567         int type;
1568
1569         type = smb2_select_sectype(cifs_ses_server(ses), ses->sectype);
1570         cifs_dbg(FYI, "sess setup type %d\n", type);
1571         if (type == Unspecified) {
1572                 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1573                 return -EINVAL;
1574         }
1575
1576         switch (type) {
1577         case Kerberos:
1578                 sess_data->func = SMB2_auth_kerberos;
1579                 break;
1580         case RawNTLMSSP:
1581                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1582                 break;
1583         default:
1584                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1585                 return -EOPNOTSUPP;
1586         }
1587
1588         return 0;
1589 }
1590
1591 int
1592 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1593                 const struct nls_table *nls_cp)
1594 {
1595         int rc = 0;
1596         struct TCP_Server_Info *server = cifs_ses_server(ses);
1597         struct SMB2_sess_data *sess_data;
1598
1599         cifs_dbg(FYI, "Session Setup\n");
1600
1601         if (!server) {
1602                 WARN(1, "%s: server is NULL!\n", __func__);
1603                 return -EIO;
1604         }
1605
1606         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1607         if (!sess_data)
1608                 return -ENOMEM;
1609
1610         rc = SMB2_select_sec(ses, sess_data);
1611         if (rc)
1612                 goto out;
1613         sess_data->xid = xid;
1614         sess_data->ses = ses;
1615         sess_data->buf0_type = CIFS_NO_BUFFER;
1616         sess_data->nls_cp = (struct nls_table *) nls_cp;
1617         sess_data->previous_session = ses->Suid;
1618
1619         /*
1620          * Initialize the session hash with the server one.
1621          */
1622         memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1623                SMB2_PREAUTH_HASH_SIZE);
1624
1625         while (sess_data->func)
1626                 sess_data->func(sess_data);
1627
1628         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1629                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1630         rc = sess_data->result;
1631 out:
1632         kfree(sess_data);
1633         return rc;
1634 }
1635
1636 int
1637 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1638 {
1639         struct smb_rqst rqst;
1640         struct smb2_logoff_req *req; /* response is also trivial struct */
1641         int rc = 0;
1642         struct TCP_Server_Info *server;
1643         int flags = 0;
1644         unsigned int total_len;
1645         struct kvec iov[1];
1646         struct kvec rsp_iov;
1647         int resp_buf_type;
1648
1649         cifs_dbg(FYI, "disconnect session %p\n", ses);
1650
1651         if (ses && (ses->server))
1652                 server = ses->server;
1653         else
1654                 return -EIO;
1655
1656         /* no need to send SMB logoff if uid already closed due to reconnect */
1657         if (ses->need_reconnect)
1658                 goto smb2_session_already_dead;
1659
1660         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1661                                  (void **) &req, &total_len);
1662         if (rc)
1663                 return rc;
1664
1665          /* since no tcon, smb2_init can not do this, so do here */
1666         req->sync_hdr.SessionId = ses->Suid;
1667
1668         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1669                 flags |= CIFS_TRANSFORM_REQ;
1670         else if (server->sign)
1671                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1672
1673         flags |= CIFS_NO_RSP_BUF;
1674
1675         iov[0].iov_base = (char *)req;
1676         iov[0].iov_len = total_len;
1677
1678         memset(&rqst, 0, sizeof(struct smb_rqst));
1679         rqst.rq_iov = iov;
1680         rqst.rq_nvec = 1;
1681
1682         rc = cifs_send_recv(xid, ses, ses->server,
1683                             &rqst, &resp_buf_type, flags, &rsp_iov);
1684         cifs_small_buf_release(req);
1685         /*
1686          * No tcon so can't do
1687          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1688          */
1689
1690 smb2_session_already_dead:
1691         return rc;
1692 }
1693
1694 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1695 {
1696         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1697 }
1698
1699 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1700
1701 /* These are similar values to what Windows uses */
1702 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1703 {
1704         tcon->max_chunks = 256;
1705         tcon->max_bytes_chunk = 1048576;
1706         tcon->max_bytes_copy = 16777216;
1707 }
1708
1709 int
1710 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1711           struct cifs_tcon *tcon, const struct nls_table *cp)
1712 {
1713         struct smb_rqst rqst;
1714         struct smb2_tree_connect_req *req;
1715         struct smb2_tree_connect_rsp *rsp = NULL;
1716         struct kvec iov[2];
1717         struct kvec rsp_iov = { NULL, 0 };
1718         int rc = 0;
1719         int resp_buftype;
1720         int unc_path_len;
1721         __le16 *unc_path = NULL;
1722         int flags = 0;
1723         unsigned int total_len;
1724         struct TCP_Server_Info *server;
1725
1726         /* always use master channel */
1727         server = ses->server;
1728
1729         cifs_dbg(FYI, "TCON\n");
1730
1731         if (!server || !tree)
1732                 return -EIO;
1733
1734         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1735         if (unc_path == NULL)
1736                 return -ENOMEM;
1737
1738         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1739         unc_path_len *= 2;
1740         if (unc_path_len < 2) {
1741                 kfree(unc_path);
1742                 return -EINVAL;
1743         }
1744
1745         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1746         tcon->tid = 0;
1747         atomic_set(&tcon->num_remote_opens, 0);
1748         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
1749                                  (void **) &req, &total_len);
1750         if (rc) {
1751                 kfree(unc_path);
1752                 return rc;
1753         }
1754
1755         if (smb3_encryption_required(tcon))
1756                 flags |= CIFS_TRANSFORM_REQ;
1757
1758         iov[0].iov_base = (char *)req;
1759         /* 1 for pad */
1760         iov[0].iov_len = total_len - 1;
1761
1762         /* Testing shows that buffer offset must be at location of Buffer[0] */
1763         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req));
1764         req->PathLength = cpu_to_le16(unc_path_len - 2);
1765         iov[1].iov_base = unc_path;
1766         iov[1].iov_len = unc_path_len;
1767
1768         /*
1769          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1770          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1771          * (Samba servers don't always set the flag so also check if null user)
1772          */
1773         if ((server->dialect == SMB311_PROT_ID) &&
1774             !smb3_encryption_required(tcon) &&
1775             !(ses->session_flags &
1776                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1777             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1778                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1779
1780         memset(&rqst, 0, sizeof(struct smb_rqst));
1781         rqst.rq_iov = iov;
1782         rqst.rq_nvec = 2;
1783
1784         /* Need 64 for max size write so ask for more in case not there yet */
1785         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1786
1787         rc = cifs_send_recv(xid, ses, server,
1788                             &rqst, &resp_buftype, flags, &rsp_iov);
1789         cifs_small_buf_release(req);
1790         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1791         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1792         if (rc != 0) {
1793                 if (tcon) {
1794                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1795                         tcon->need_reconnect = true;
1796                 }
1797                 goto tcon_error_exit;
1798         }
1799
1800         switch (rsp->ShareType) {
1801         case SMB2_SHARE_TYPE_DISK:
1802                 cifs_dbg(FYI, "connection to disk share\n");
1803                 break;
1804         case SMB2_SHARE_TYPE_PIPE:
1805                 tcon->pipe = true;
1806                 cifs_dbg(FYI, "connection to pipe share\n");
1807                 break;
1808         case SMB2_SHARE_TYPE_PRINT:
1809                 tcon->print = true;
1810                 cifs_dbg(FYI, "connection to printer\n");
1811                 break;
1812         default:
1813                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1814                 rc = -EOPNOTSUPP;
1815                 goto tcon_error_exit;
1816         }
1817
1818         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1819         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1820         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1821         tcon->tidStatus = CifsGood;
1822         tcon->need_reconnect = false;
1823         tcon->tid = rsp->sync_hdr.TreeId;
1824         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1825
1826         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1827             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1828                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1829
1830         if (tcon->seal &&
1831             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1832                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1833
1834         init_copy_chunk_defaults(tcon);
1835         if (server->ops->validate_negotiate)
1836                 rc = server->ops->validate_negotiate(xid, tcon);
1837 tcon_exit:
1838
1839         free_rsp_buf(resp_buftype, rsp);
1840         kfree(unc_path);
1841         return rc;
1842
1843 tcon_error_exit:
1844         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1845                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1846         }
1847         goto tcon_exit;
1848 }
1849
1850 int
1851 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1852 {
1853         struct smb_rqst rqst;
1854         struct smb2_tree_disconnect_req *req; /* response is trivial */
1855         int rc = 0;
1856         struct cifs_ses *ses = tcon->ses;
1857         int flags = 0;
1858         unsigned int total_len;
1859         struct kvec iov[1];
1860         struct kvec rsp_iov;
1861         int resp_buf_type;
1862
1863         cifs_dbg(FYI, "Tree Disconnect\n");
1864
1865         if (!ses || !(ses->server))
1866                 return -EIO;
1867
1868         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1869                 return 0;
1870
1871         close_shroot_lease(&tcon->crfid);
1872
1873         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
1874                                  (void **) &req,
1875                                  &total_len);
1876         if (rc)
1877                 return rc;
1878
1879         if (smb3_encryption_required(tcon))
1880                 flags |= CIFS_TRANSFORM_REQ;
1881
1882         flags |= CIFS_NO_RSP_BUF;
1883
1884         iov[0].iov_base = (char *)req;
1885         iov[0].iov_len = total_len;
1886
1887         memset(&rqst, 0, sizeof(struct smb_rqst));
1888         rqst.rq_iov = iov;
1889         rqst.rq_nvec = 1;
1890
1891         rc = cifs_send_recv(xid, ses, ses->server,
1892                             &rqst, &resp_buf_type, flags, &rsp_iov);
1893         cifs_small_buf_release(req);
1894         if (rc)
1895                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1896
1897         return rc;
1898 }
1899
1900
1901 static struct create_durable *
1902 create_durable_buf(void)
1903 {
1904         struct create_durable *buf;
1905
1906         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1907         if (!buf)
1908                 return NULL;
1909
1910         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1911                                         (struct create_durable, Data));
1912         buf->ccontext.DataLength = cpu_to_le32(16);
1913         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1914                                 (struct create_durable, Name));
1915         buf->ccontext.NameLength = cpu_to_le16(4);
1916         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1917         buf->Name[0] = 'D';
1918         buf->Name[1] = 'H';
1919         buf->Name[2] = 'n';
1920         buf->Name[3] = 'Q';
1921         return buf;
1922 }
1923
1924 static struct create_durable *
1925 create_reconnect_durable_buf(struct cifs_fid *fid)
1926 {
1927         struct create_durable *buf;
1928
1929         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1930         if (!buf)
1931                 return NULL;
1932
1933         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1934                                         (struct create_durable, Data));
1935         buf->ccontext.DataLength = cpu_to_le32(16);
1936         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1937                                 (struct create_durable, Name));
1938         buf->ccontext.NameLength = cpu_to_le16(4);
1939         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1940         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1941         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1942         buf->Name[0] = 'D';
1943         buf->Name[1] = 'H';
1944         buf->Name[2] = 'n';
1945         buf->Name[3] = 'C';
1946         return buf;
1947 }
1948
1949 static void
1950 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
1951 {
1952         struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
1953
1954         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
1955                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
1956         buf->IndexNumber = pdisk_id->DiskFileId;
1957 }
1958
1959 static void
1960 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
1961                  struct create_posix_rsp *posix)
1962 {
1963         int sid_len;
1964         u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
1965         u8 *end = beg + le32_to_cpu(cc->DataLength);
1966         u8 *sid;
1967
1968         memset(posix, 0, sizeof(*posix));
1969
1970         posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
1971         posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
1972         posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
1973
1974         sid = beg + 12;
1975         sid_len = posix_info_sid_size(sid, end);
1976         if (sid_len < 0) {
1977                 cifs_dbg(VFS, "bad owner sid in posix create response\n");
1978                 return;
1979         }
1980         memcpy(&posix->owner, sid, sid_len);
1981
1982         sid = sid + sid_len;
1983         sid_len = posix_info_sid_size(sid, end);
1984         if (sid_len < 0) {
1985                 cifs_dbg(VFS, "bad group sid in posix create response\n");
1986                 return;
1987         }
1988         memcpy(&posix->group, sid, sid_len);
1989
1990         cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
1991                  posix->nlink, posix->mode, posix->reparse_tag);
1992 }
1993
1994 int smb2_parse_contexts(struct TCP_Server_Info *server,
1995                         struct kvec *rsp_iov,
1996                         unsigned int *epoch,
1997                         char *lease_key, __u8 *oplock,
1998                         struct smb2_file_all_info *buf,
1999                         struct create_posix_rsp *posix)
2000 {
2001         struct smb2_create_rsp *rsp = rsp_iov->iov_base;
2002         struct create_context *cc;
2003         size_t rem, off, len;
2004         size_t doff, dlen;
2005         size_t noff, nlen;
2006         char *name;
2007         static const char smb3_create_tag_posix[] = {
2008                 0x93, 0xAD, 0x25, 0x50, 0x9C,
2009                 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2010                 0xDE, 0x96, 0x8B, 0xCD, 0x7C
2011         };
2012
2013         *oplock = 0;
2014
2015         off = le32_to_cpu(rsp->CreateContextsOffset);
2016         rem = le32_to_cpu(rsp->CreateContextsLength);
2017         if (check_add_overflow(off, rem, &len) || len > rsp_iov->iov_len)
2018                 return -EINVAL;
2019         cc = (struct create_context *)((u8 *)rsp + off);
2020
2021         /* Initialize inode number to 0 in case no valid data in qfid context */
2022         if (buf)
2023                 buf->IndexNumber = 0;
2024
2025         while (rem >= sizeof(*cc)) {
2026                 doff = le16_to_cpu(cc->DataOffset);
2027                 dlen = le32_to_cpu(cc->DataLength);
2028                 if (check_add_overflow(doff, dlen, &len) || len > rem)
2029                         return -EINVAL;
2030
2031                 noff = le16_to_cpu(cc->NameOffset);
2032                 nlen = le16_to_cpu(cc->NameLength);
2033                 if (noff + nlen > doff)
2034                         return -EINVAL;
2035
2036                 name = (char *)cc + noff;
2037                 switch (nlen) {
2038                 case 4:
2039                         if (!strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4)) {
2040                                 *oplock = server->ops->parse_lease_buf(cc, epoch,
2041                                                                        lease_key);
2042                         } else if (buf &&
2043                                    !strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4)) {
2044                                 parse_query_id_ctxt(cc, buf);
2045                         }
2046                         break;
2047                 case 16:
2048                         if (posix && !memcmp(name, smb3_create_tag_posix, 16))
2049                                 parse_posix_ctxt(cc, buf, posix);
2050                         break;
2051                 default:
2052                         cifs_dbg(FYI, "%s: unhandled context (nlen=%zu dlen=%zu)\n",
2053                                  __func__, nlen, dlen);
2054                         if (IS_ENABLED(CONFIG_CIFS_DEBUG2))
2055                                 cifs_dump_mem("context data: ", cc, dlen);
2056                         break;
2057                 }
2058
2059                 off = le32_to_cpu(cc->Next);
2060                 if (!off)
2061                         break;
2062                 if (check_sub_overflow(rem, off, &rem))
2063                         return -EINVAL;
2064                 cc = (struct create_context *)((u8 *)cc + off);
2065         }
2066
2067         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2068                 *oplock = rsp->OplockLevel;
2069
2070         return 0;
2071 }
2072
2073 static int
2074 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
2075                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2076 {
2077         struct smb2_create_req *req = iov[0].iov_base;
2078         unsigned int num = *num_iovec;
2079
2080         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2081         if (iov[num].iov_base == NULL)
2082                 return -ENOMEM;
2083         iov[num].iov_len = server->vals->create_lease_size;
2084         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2085         if (!req->CreateContextsOffset)
2086                 req->CreateContextsOffset = cpu_to_le32(
2087                                 sizeof(struct smb2_create_req) +
2088                                 iov[num - 1].iov_len);
2089         le32_add_cpu(&req->CreateContextsLength,
2090                      server->vals->create_lease_size);
2091         *num_iovec = num + 1;
2092         return 0;
2093 }
2094
2095 static struct create_durable_v2 *
2096 create_durable_v2_buf(struct cifs_open_parms *oparms)
2097 {
2098         struct cifs_fid *pfid = oparms->fid;
2099         struct create_durable_v2 *buf;
2100
2101         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2102         if (!buf)
2103                 return NULL;
2104
2105         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2106                                         (struct create_durable_v2, dcontext));
2107         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2108         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2109                                 (struct create_durable_v2, Name));
2110         buf->ccontext.NameLength = cpu_to_le16(4);
2111
2112         /*
2113          * NB: Handle timeout defaults to 0, which allows server to choose
2114          * (most servers default to 120 seconds) and most clients default to 0.
2115          * This can be overridden at mount ("handletimeout=") if the user wants
2116          * a different persistent (or resilient) handle timeout for all opens
2117          * opens on a particular SMB3 mount.
2118          */
2119         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2120         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2121         generate_random_uuid(buf->dcontext.CreateGuid);
2122         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2123
2124         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2125         buf->Name[0] = 'D';
2126         buf->Name[1] = 'H';
2127         buf->Name[2] = '2';
2128         buf->Name[3] = 'Q';
2129         return buf;
2130 }
2131
2132 static struct create_durable_handle_reconnect_v2 *
2133 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2134 {
2135         struct create_durable_handle_reconnect_v2 *buf;
2136
2137         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2138                         GFP_KERNEL);
2139         if (!buf)
2140                 return NULL;
2141
2142         buf->ccontext.DataOffset =
2143                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2144                                      dcontext));
2145         buf->ccontext.DataLength =
2146                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2147         buf->ccontext.NameOffset =
2148                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2149                             Name));
2150         buf->ccontext.NameLength = cpu_to_le16(4);
2151
2152         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2153         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2154         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2155         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2156
2157         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2158         buf->Name[0] = 'D';
2159         buf->Name[1] = 'H';
2160         buf->Name[2] = '2';
2161         buf->Name[3] = 'C';
2162         return buf;
2163 }
2164
2165 static int
2166 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2167                     struct cifs_open_parms *oparms)
2168 {
2169         struct smb2_create_req *req = iov[0].iov_base;
2170         unsigned int num = *num_iovec;
2171
2172         iov[num].iov_base = create_durable_v2_buf(oparms);
2173         if (iov[num].iov_base == NULL)
2174                 return -ENOMEM;
2175         iov[num].iov_len = sizeof(struct create_durable_v2);
2176         if (!req->CreateContextsOffset)
2177                 req->CreateContextsOffset =
2178                         cpu_to_le32(sizeof(struct smb2_create_req) +
2179                                                                 iov[1].iov_len);
2180         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2181         *num_iovec = num + 1;
2182         return 0;
2183 }
2184
2185 static int
2186 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2187                     struct cifs_open_parms *oparms)
2188 {
2189         struct smb2_create_req *req = iov[0].iov_base;
2190         unsigned int num = *num_iovec;
2191
2192         /* indicate that we don't need to relock the file */
2193         oparms->reconnect = false;
2194
2195         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2196         if (iov[num].iov_base == NULL)
2197                 return -ENOMEM;
2198         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2199         if (!req->CreateContextsOffset)
2200                 req->CreateContextsOffset =
2201                         cpu_to_le32(sizeof(struct smb2_create_req) +
2202                                                                 iov[1].iov_len);
2203         le32_add_cpu(&req->CreateContextsLength,
2204                         sizeof(struct create_durable_handle_reconnect_v2));
2205         *num_iovec = num + 1;
2206         return 0;
2207 }
2208
2209 static int
2210 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2211                     struct cifs_open_parms *oparms, bool use_persistent)
2212 {
2213         struct smb2_create_req *req = iov[0].iov_base;
2214         unsigned int num = *num_iovec;
2215
2216         if (use_persistent) {
2217                 if (oparms->reconnect)
2218                         return add_durable_reconnect_v2_context(iov, num_iovec,
2219                                                                 oparms);
2220                 else
2221                         return add_durable_v2_context(iov, num_iovec, oparms);
2222         }
2223
2224         if (oparms->reconnect) {
2225                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2226                 /* indicate that we don't need to relock the file */
2227                 oparms->reconnect = false;
2228         } else
2229                 iov[num].iov_base = create_durable_buf();
2230         if (iov[num].iov_base == NULL)
2231                 return -ENOMEM;
2232         iov[num].iov_len = sizeof(struct create_durable);
2233         if (!req->CreateContextsOffset)
2234                 req->CreateContextsOffset =
2235                         cpu_to_le32(sizeof(struct smb2_create_req) +
2236                                                                 iov[1].iov_len);
2237         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2238         *num_iovec = num + 1;
2239         return 0;
2240 }
2241
2242 /* See MS-SMB2 2.2.13.2.7 */
2243 static struct crt_twarp_ctxt *
2244 create_twarp_buf(__u64 timewarp)
2245 {
2246         struct crt_twarp_ctxt *buf;
2247
2248         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2249         if (!buf)
2250                 return NULL;
2251
2252         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2253                                         (struct crt_twarp_ctxt, Timestamp));
2254         buf->ccontext.DataLength = cpu_to_le32(8);
2255         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2256                                 (struct crt_twarp_ctxt, Name));
2257         buf->ccontext.NameLength = cpu_to_le16(4);
2258         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2259         buf->Name[0] = 'T';
2260         buf->Name[1] = 'W';
2261         buf->Name[2] = 'r';
2262         buf->Name[3] = 'p';
2263         buf->Timestamp = cpu_to_le64(timewarp);
2264         return buf;
2265 }
2266
2267 /* See MS-SMB2 2.2.13.2.7 */
2268 static int
2269 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2270 {
2271         struct smb2_create_req *req = iov[0].iov_base;
2272         unsigned int num = *num_iovec;
2273
2274         iov[num].iov_base = create_twarp_buf(timewarp);
2275         if (iov[num].iov_base == NULL)
2276                 return -ENOMEM;
2277         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2278         if (!req->CreateContextsOffset)
2279                 req->CreateContextsOffset = cpu_to_le32(
2280                                 sizeof(struct smb2_create_req) +
2281                                 iov[num - 1].iov_len);
2282         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2283         *num_iovec = num + 1;
2284         return 0;
2285 }
2286
2287 /* See See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2288 static void setup_owner_group_sids(char *buf)
2289 {
2290         struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2291
2292         /* Populate the user ownership fields S-1-5-88-1 */
2293         sids->owner.Revision = 1;
2294         sids->owner.NumAuth = 3;
2295         sids->owner.Authority[5] = 5;
2296         sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2297         sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2298         sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2299
2300         /* Populate the group ownership fields S-1-5-88-2 */
2301         sids->group.Revision = 1;
2302         sids->group.NumAuth = 3;
2303         sids->group.Authority[5] = 5;
2304         sids->group.SubAuthorities[0] = cpu_to_le32(88);
2305         sids->group.SubAuthorities[1] = cpu_to_le32(2);
2306         sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2307
2308         cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2309 }
2310
2311 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2312 static struct crt_sd_ctxt *
2313 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2314 {
2315         struct crt_sd_ctxt *buf;
2316         __u8 *ptr, *aclptr;
2317         unsigned int acelen, acl_size, ace_count;
2318         unsigned int owner_offset = 0;
2319         unsigned int group_offset = 0;
2320         struct smb3_acl acl = {};
2321
2322         *len = roundup(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
2323
2324         if (set_owner) {
2325                 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2326                 *len += sizeof(struct owner_group_sids);
2327         }
2328
2329         buf = kzalloc(*len, GFP_KERNEL);
2330         if (buf == NULL)
2331                 return buf;
2332
2333         ptr = (__u8 *)&buf[1];
2334         if (set_owner) {
2335                 /* offset fields are from beginning of security descriptor not of create context */
2336                 owner_offset = ptr - (__u8 *)&buf->sd;
2337                 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2338                 group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2339                 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2340
2341                 setup_owner_group_sids(ptr);
2342                 ptr += sizeof(struct owner_group_sids);
2343         } else {
2344                 buf->sd.OffsetOwner = 0;
2345                 buf->sd.OffsetGroup = 0;
2346         }
2347
2348         buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2349         buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2350         buf->ccontext.NameLength = cpu_to_le16(4);
2351         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2352         buf->Name[0] = 'S';
2353         buf->Name[1] = 'e';
2354         buf->Name[2] = 'c';
2355         buf->Name[3] = 'D';
2356         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2357
2358         /*
2359          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2360          * and "DP" ie the DACL is present
2361          */
2362         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2363
2364         /* offset owner, group and Sbz1 and SACL are all zero */
2365         buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2366         /* Ship the ACL for now. we will copy it into buf later. */
2367         aclptr = ptr;
2368         ptr += sizeof(struct smb3_acl);
2369
2370         /* create one ACE to hold the mode embedded in reserved special SID */
2371         acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode);
2372         ptr += acelen;
2373         acl_size = acelen + sizeof(struct smb3_acl);
2374         ace_count = 1;
2375
2376         if (set_owner) {
2377                 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2378                 acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr);
2379                 ptr += acelen;
2380                 acl_size += acelen;
2381                 ace_count += 1;
2382         }
2383
2384         /* and one more ACE to allow access for authenticated users */
2385         acelen = setup_authusers_ACE((struct cifs_ace *)ptr);
2386         ptr += acelen;
2387         acl_size += acelen;
2388         ace_count += 1;
2389
2390         acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2391         acl.AclSize = cpu_to_le16(acl_size);
2392         acl.AceCount = cpu_to_le16(ace_count);
2393         /* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */
2394         memcpy(aclptr, &acl, sizeof(struct smb3_acl));
2395
2396         buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2397         *len = roundup(ptr - (__u8 *)buf, 8);
2398
2399         return buf;
2400 }
2401
2402 static int
2403 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2404 {
2405         struct smb2_create_req *req = iov[0].iov_base;
2406         unsigned int num = *num_iovec;
2407         unsigned int len = 0;
2408
2409         iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2410         if (iov[num].iov_base == NULL)
2411                 return -ENOMEM;
2412         iov[num].iov_len = len;
2413         if (!req->CreateContextsOffset)
2414                 req->CreateContextsOffset = cpu_to_le32(
2415                                 sizeof(struct smb2_create_req) +
2416                                 iov[num - 1].iov_len);
2417         le32_add_cpu(&req->CreateContextsLength, len);
2418         *num_iovec = num + 1;
2419         return 0;
2420 }
2421
2422 static struct crt_query_id_ctxt *
2423 create_query_id_buf(void)
2424 {
2425         struct crt_query_id_ctxt *buf;
2426
2427         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2428         if (!buf)
2429                 return NULL;
2430
2431         buf->ccontext.DataOffset = cpu_to_le16(0);
2432         buf->ccontext.DataLength = cpu_to_le32(0);
2433         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2434                                 (struct crt_query_id_ctxt, Name));
2435         buf->ccontext.NameLength = cpu_to_le16(4);
2436         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2437         buf->Name[0] = 'Q';
2438         buf->Name[1] = 'F';
2439         buf->Name[2] = 'i';
2440         buf->Name[3] = 'd';
2441         return buf;
2442 }
2443
2444 /* See MS-SMB2 2.2.13.2.9 */
2445 static int
2446 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2447 {
2448         struct smb2_create_req *req = iov[0].iov_base;
2449         unsigned int num = *num_iovec;
2450
2451         iov[num].iov_base = create_query_id_buf();
2452         if (iov[num].iov_base == NULL)
2453                 return -ENOMEM;
2454         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2455         if (!req->CreateContextsOffset)
2456                 req->CreateContextsOffset = cpu_to_le32(
2457                                 sizeof(struct smb2_create_req) +
2458                                 iov[num - 1].iov_len);
2459         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2460         *num_iovec = num + 1;
2461         return 0;
2462 }
2463
2464 static int
2465 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2466                             const char *treename, const __le16 *path)
2467 {
2468         int treename_len, path_len;
2469         struct nls_table *cp;
2470         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2471
2472         /*
2473          * skip leading "\\"
2474          */
2475         treename_len = strlen(treename);
2476         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2477                 return -EINVAL;
2478
2479         treename += 2;
2480         treename_len -= 2;
2481
2482         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2483
2484         /*
2485          * make room for one path separator between the treename and
2486          * path
2487          */
2488         *out_len = treename_len + 1 + path_len;
2489
2490         /*
2491          * final path needs to be null-terminated UTF16 with a
2492          * size aligned to 8
2493          */
2494
2495         *out_size = roundup((*out_len+1)*2, 8);
2496         *out_path = kzalloc(*out_size, GFP_KERNEL);
2497         if (!*out_path)
2498                 return -ENOMEM;
2499
2500         cp = load_nls_default();
2501         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2502         UniStrcat(*out_path, sep);
2503         UniStrcat(*out_path, path);
2504         unload_nls(cp);
2505
2506         return 0;
2507 }
2508
2509 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2510                                umode_t mode, struct cifs_tcon *tcon,
2511                                const char *full_path,
2512                                struct cifs_sb_info *cifs_sb)
2513 {
2514         struct smb_rqst rqst;
2515         struct smb2_create_req *req;
2516         struct smb2_create_rsp *rsp = NULL;
2517         struct cifs_ses *ses = tcon->ses;
2518         struct kvec iov[3]; /* make sure at least one for each open context */
2519         struct kvec rsp_iov = {NULL, 0};
2520         int resp_buftype;
2521         int uni_path_len;
2522         __le16 *copy_path = NULL;
2523         int copy_size;
2524         int rc = 0;
2525         unsigned int n_iov = 2;
2526         __u32 file_attributes = 0;
2527         char *pc_buf = NULL;
2528         int flags = 0;
2529         unsigned int total_len;
2530         __le16 *utf16_path = NULL;
2531         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2532
2533         cifs_dbg(FYI, "mkdir\n");
2534
2535         /* resource #1: path allocation */
2536         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2537         if (!utf16_path)
2538                 return -ENOMEM;
2539
2540         if (!ses || !server) {
2541                 rc = -EIO;
2542                 goto err_free_path;
2543         }
2544
2545         /* resource #2: request */
2546         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2547                                  (void **) &req, &total_len);
2548         if (rc)
2549                 goto err_free_path;
2550
2551
2552         if (smb3_encryption_required(tcon))
2553                 flags |= CIFS_TRANSFORM_REQ;
2554
2555         req->ImpersonationLevel = IL_IMPERSONATION;
2556         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2557         /* File attributes ignored on open (used in create though) */
2558         req->FileAttributes = cpu_to_le32(file_attributes);
2559         req->ShareAccess = FILE_SHARE_ALL_LE;
2560         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2561         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2562
2563         iov[0].iov_base = (char *)req;
2564         /* -1 since last byte is buf[0] which is sent below (path) */
2565         iov[0].iov_len = total_len - 1;
2566
2567         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2568
2569         /* [MS-SMB2] 2.2.13 NameOffset:
2570          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2571          * the SMB2 header, the file name includes a prefix that will
2572          * be processed during DFS name normalization as specified in
2573          * section 3.3.5.9. Otherwise, the file name is relative to
2574          * the share that is identified by the TreeId in the SMB2
2575          * header.
2576          */
2577         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2578                 int name_len;
2579
2580                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2581                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2582                                                  &name_len,
2583                                                  tcon->treeName, utf16_path);
2584                 if (rc)
2585                         goto err_free_req;
2586
2587                 req->NameLength = cpu_to_le16(name_len * 2);
2588                 uni_path_len = copy_size;
2589                 /* free before overwriting resource */
2590                 kfree(utf16_path);
2591                 utf16_path = copy_path;
2592         } else {
2593                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2594                 /* MUST set path len (NameLength) to 0 opening root of share */
2595                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2596                 if (uni_path_len % 8 != 0) {
2597                         copy_size = roundup(uni_path_len, 8);
2598                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2599                         if (!copy_path) {
2600                                 rc = -ENOMEM;
2601                                 goto err_free_req;
2602                         }
2603                         memcpy((char *)copy_path, (const char *)utf16_path,
2604                                uni_path_len);
2605                         uni_path_len = copy_size;
2606                         /* free before overwriting resource */
2607                         kfree(utf16_path);
2608                         utf16_path = copy_path;
2609                 }
2610         }
2611
2612         iov[1].iov_len = uni_path_len;
2613         iov[1].iov_base = utf16_path;
2614         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2615
2616         if (tcon->posix_extensions) {
2617                 /* resource #3: posix buf */
2618                 rc = add_posix_context(iov, &n_iov, mode);
2619                 if (rc)
2620                         goto err_free_req;
2621                 pc_buf = iov[n_iov-1].iov_base;
2622         }
2623
2624
2625         memset(&rqst, 0, sizeof(struct smb_rqst));
2626         rqst.rq_iov = iov;
2627         rqst.rq_nvec = n_iov;
2628
2629         /* no need to inc num_remote_opens because we close it just below */
2630         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2631                                     FILE_WRITE_ATTRIBUTES);
2632         /* resource #4: response buffer */
2633         rc = cifs_send_recv(xid, ses, server,
2634                             &rqst, &resp_buftype, flags, &rsp_iov);
2635         if (rc) {
2636                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2637                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2638                                            CREATE_NOT_FILE,
2639                                            FILE_WRITE_ATTRIBUTES, rc);
2640                 goto err_free_rsp_buf;
2641         }
2642
2643         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2644         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2645                                     ses->Suid, CREATE_NOT_FILE,
2646                                     FILE_WRITE_ATTRIBUTES);
2647
2648         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2649
2650         /* Eventually save off posix specific response info and timestaps */
2651
2652 err_free_rsp_buf:
2653         free_rsp_buf(resp_buftype, rsp);
2654         kfree(pc_buf);
2655 err_free_req:
2656         cifs_small_buf_release(req);
2657 err_free_path:
2658         kfree(utf16_path);
2659         return rc;
2660 }
2661
2662 int
2663 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2664                struct smb_rqst *rqst, __u8 *oplock,
2665                struct cifs_open_parms *oparms, __le16 *path)
2666 {
2667         struct smb2_create_req *req;
2668         unsigned int n_iov = 2;
2669         __u32 file_attributes = 0;
2670         int copy_size;
2671         int uni_path_len;
2672         unsigned int total_len;
2673         struct kvec *iov = rqst->rq_iov;
2674         __le16 *copy_path;
2675         int rc;
2676
2677         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2678                                  (void **) &req, &total_len);
2679         if (rc)
2680                 return rc;
2681
2682         iov[0].iov_base = (char *)req;
2683         /* -1 since last byte is buf[0] which is sent below (path) */
2684         iov[0].iov_len = total_len - 1;
2685
2686         if (oparms->create_options & CREATE_OPTION_READONLY)
2687                 file_attributes |= ATTR_READONLY;
2688         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2689                 file_attributes |= ATTR_SYSTEM;
2690
2691         req->ImpersonationLevel = IL_IMPERSONATION;
2692         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2693         /* File attributes ignored on open (used in create though) */
2694         req->FileAttributes = cpu_to_le32(file_attributes);
2695         req->ShareAccess = FILE_SHARE_ALL_LE;
2696
2697         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2698         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2699         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2700
2701         /* [MS-SMB2] 2.2.13 NameOffset:
2702          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2703          * the SMB2 header, the file name includes a prefix that will
2704          * be processed during DFS name normalization as specified in
2705          * section 3.3.5.9. Otherwise, the file name is relative to
2706          * the share that is identified by the TreeId in the SMB2
2707          * header.
2708          */
2709         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2710                 int name_len;
2711
2712                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2713                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2714                                                  &name_len,
2715                                                  tcon->treeName, path);
2716                 if (rc)
2717                         return rc;
2718                 req->NameLength = cpu_to_le16(name_len * 2);
2719                 uni_path_len = copy_size;
2720                 path = copy_path;
2721         } else {
2722                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2723                 /* MUST set path len (NameLength) to 0 opening root of share */
2724                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2725                 copy_size = uni_path_len;
2726                 if (copy_size % 8 != 0)
2727                         copy_size = roundup(copy_size, 8);
2728                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2729                 if (!copy_path)
2730                         return -ENOMEM;
2731                 memcpy((char *)copy_path, (const char *)path,
2732                        uni_path_len);
2733                 uni_path_len = copy_size;
2734                 path = copy_path;
2735         }
2736
2737         iov[1].iov_len = uni_path_len;
2738         iov[1].iov_base = path;
2739
2740         if ((!server->oplocks) || (tcon->no_lease))
2741                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2742
2743         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2744             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2745                 req->RequestedOplockLevel = *oplock;
2746         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2747                   (oparms->create_options & CREATE_NOT_FILE))
2748                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2749         else {
2750                 rc = add_lease_context(server, iov, &n_iov,
2751                                        oparms->fid->lease_key, oplock);
2752                 if (rc)
2753                         return rc;
2754         }
2755
2756         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2757                 /* need to set Next field of lease context if we request it */
2758                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2759                         struct create_context *ccontext =
2760                             (struct create_context *)iov[n_iov-1].iov_base;
2761                         ccontext->Next =
2762                                 cpu_to_le32(server->vals->create_lease_size);
2763                 }
2764
2765                 rc = add_durable_context(iov, &n_iov, oparms,
2766                                         tcon->use_persistent);
2767                 if (rc)
2768                         return rc;
2769         }
2770
2771         if (tcon->posix_extensions) {
2772                 if (n_iov > 2) {
2773                         struct create_context *ccontext =
2774                             (struct create_context *)iov[n_iov-1].iov_base;
2775                         ccontext->Next =
2776                                 cpu_to_le32(iov[n_iov-1].iov_len);
2777                 }
2778
2779                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2780                 if (rc)
2781                         return rc;
2782         }
2783
2784         if (tcon->snapshot_time) {
2785                 cifs_dbg(FYI, "adding snapshot context\n");
2786                 if (n_iov > 2) {
2787                         struct create_context *ccontext =
2788                             (struct create_context *)iov[n_iov-1].iov_base;
2789                         ccontext->Next =
2790                                 cpu_to_le32(iov[n_iov-1].iov_len);
2791                 }
2792
2793                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2794                 if (rc)
2795                         return rc;
2796         }
2797
2798         if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
2799                 bool set_mode;
2800                 bool set_owner;
2801
2802                 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2803                     (oparms->mode != ACL_NO_MODE))
2804                         set_mode = true;
2805                 else {
2806                         set_mode = false;
2807                         oparms->mode = ACL_NO_MODE;
2808                 }
2809
2810                 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
2811                         set_owner = true;
2812                 else
2813                         set_owner = false;
2814
2815                 if (set_owner | set_mode) {
2816                         if (n_iov > 2) {
2817                                 struct create_context *ccontext =
2818                                     (struct create_context *)iov[n_iov-1].iov_base;
2819                                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2820                         }
2821
2822                         cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2823                         rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
2824                         if (rc)
2825                                 return rc;
2826                 }
2827         }
2828
2829         if (n_iov > 2) {
2830                 struct create_context *ccontext =
2831                         (struct create_context *)iov[n_iov-1].iov_base;
2832                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2833         }
2834         add_query_id_context(iov, &n_iov);
2835
2836         rqst->rq_nvec = n_iov;
2837         return 0;
2838 }
2839
2840 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2841  * All other vectors are freed by kfree().
2842  */
2843 void
2844 SMB2_open_free(struct smb_rqst *rqst)
2845 {
2846         int i;
2847
2848         if (rqst && rqst->rq_iov) {
2849                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2850                 for (i = 1; i < rqst->rq_nvec; i++)
2851                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2852                                 kfree(rqst->rq_iov[i].iov_base);
2853         }
2854 }
2855
2856 int
2857 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2858           __u8 *oplock, struct smb2_file_all_info *buf,
2859           struct create_posix_rsp *posix,
2860           struct kvec *err_iov, int *buftype)
2861 {
2862         struct smb_rqst rqst;
2863         struct smb2_create_rsp *rsp = NULL;
2864         struct cifs_tcon *tcon = oparms->tcon;
2865         struct cifs_ses *ses = tcon->ses;
2866         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2867         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2868         struct kvec rsp_iov = {NULL, 0};
2869         int resp_buftype = CIFS_NO_BUFFER;
2870         int rc = 0;
2871         int flags = 0;
2872
2873         cifs_dbg(FYI, "create/open\n");
2874         if (!ses || !server)
2875                 return -EIO;
2876
2877         if (smb3_encryption_required(tcon))
2878                 flags |= CIFS_TRANSFORM_REQ;
2879
2880         memset(&rqst, 0, sizeof(struct smb_rqst));
2881         memset(&iov, 0, sizeof(iov));
2882         rqst.rq_iov = iov;
2883         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2884
2885         rc = SMB2_open_init(tcon, server,
2886                             &rqst, oplock, oparms, path);
2887         if (rc)
2888                 goto creat_exit;
2889
2890         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2891                 oparms->create_options, oparms->desired_access);
2892
2893         rc = cifs_send_recv(xid, ses, server,
2894                             &rqst, &resp_buftype, flags,
2895                             &rsp_iov);
2896         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2897
2898         if (rc != 0) {
2899                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2900                 if (err_iov && rsp) {
2901                         *err_iov = rsp_iov;
2902                         *buftype = resp_buftype;
2903                         resp_buftype = CIFS_NO_BUFFER;
2904                         rsp = NULL;
2905                 }
2906                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2907                                     oparms->create_options, oparms->desired_access, rc);
2908                 if (rc == -EREMCHG) {
2909                         pr_warn_once("server share %s deleted\n",
2910                                      tcon->treeName);
2911                         tcon->need_reconnect = true;
2912                 }
2913                 goto creat_exit;
2914         } else
2915                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2916                                      ses->Suid, oparms->create_options,
2917                                      oparms->desired_access);
2918
2919         atomic_inc(&tcon->num_remote_opens);
2920         oparms->fid->persistent_fid = rsp->PersistentFileId;
2921         oparms->fid->volatile_fid = rsp->VolatileFileId;
2922         oparms->fid->access = oparms->desired_access;
2923 #ifdef CONFIG_CIFS_DEBUG2
2924         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2925 #endif /* CIFS_DEBUG2 */
2926
2927         if (buf) {
2928                 memcpy(buf, &rsp->CreationTime, 32);
2929                 buf->AllocationSize = rsp->AllocationSize;
2930                 buf->EndOfFile = rsp->EndofFile;
2931                 buf->Attributes = rsp->FileAttributes;
2932                 buf->NumberOfLinks = cpu_to_le32(1);
2933                 buf->DeletePending = 0;
2934         }
2935
2936
2937         rc = smb2_parse_contexts(server, &rsp_iov, &oparms->fid->epoch,
2938                                  oparms->fid->lease_key, oplock, buf, posix);
2939 creat_exit:
2940         SMB2_open_free(&rqst);
2941         free_rsp_buf(resp_buftype, rsp);
2942         return rc;
2943 }
2944
2945 int
2946 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2947                 struct smb_rqst *rqst,
2948                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2949                 char *in_data, u32 indatalen,
2950                 __u32 max_response_size)
2951 {
2952         struct smb2_ioctl_req *req;
2953         struct kvec *iov = rqst->rq_iov;
2954         unsigned int total_len;
2955         int rc;
2956         char *in_data_buf;
2957
2958         rc = smb2_ioctl_req_init(opcode, tcon, server,
2959                                  (void **) &req, &total_len);
2960         if (rc)
2961                 return rc;
2962
2963         if (indatalen) {
2964                 /*
2965                  * indatalen is usually small at a couple of bytes max, so
2966                  * just allocate through generic pool
2967                  */
2968                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
2969                 if (!in_data_buf) {
2970                         cifs_small_buf_release(req);
2971                         return -ENOMEM;
2972                 }
2973         }
2974
2975         req->CtlCode = cpu_to_le32(opcode);
2976         req->PersistentFileId = persistent_fid;
2977         req->VolatileFileId = volatile_fid;
2978
2979         iov[0].iov_base = (char *)req;
2980         /*
2981          * If no input data, the size of ioctl struct in
2982          * protocol spec still includes a 1 byte data buffer,
2983          * but if input data passed to ioctl, we do not
2984          * want to double count this, so we do not send
2985          * the dummy one byte of data in iovec[0] if sending
2986          * input data (in iovec[1]).
2987          */
2988         if (indatalen) {
2989                 req->InputCount = cpu_to_le32(indatalen);
2990                 /* do not set InputOffset if no input data */
2991                 req->InputOffset =
2992                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2993                 rqst->rq_nvec = 2;
2994                 iov[0].iov_len = total_len - 1;
2995                 iov[1].iov_base = in_data_buf;
2996                 iov[1].iov_len = indatalen;
2997         } else {
2998                 rqst->rq_nvec = 1;
2999                 iov[0].iov_len = total_len;
3000         }
3001
3002         req->OutputOffset = 0;
3003         req->OutputCount = 0; /* MBZ */
3004
3005         /*
3006          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
3007          * We Could increase default MaxOutputResponse, but that could require
3008          * more credits. Windows typically sets this smaller, but for some
3009          * ioctls it may be useful to allow server to send more. No point
3010          * limiting what the server can send as long as fits in one credit
3011          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
3012          * to increase this limit up in the future.
3013          * Note that for snapshot queries that servers like Azure expect that
3014          * the first query be minimal size (and just used to get the number/size
3015          * of previous versions) so response size must be specified as EXACTLY
3016          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
3017          * of eight bytes.  Currently that is the only case where we set max
3018          * response size smaller.
3019          */
3020         req->MaxOutputResponse = cpu_to_le32(max_response_size);
3021         req->sync_hdr.CreditCharge =
3022                 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
3023                                          SMB2_MAX_BUFFER_SIZE));
3024         /* always an FSCTL (for now) */
3025         req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
3026
3027         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3028         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3029                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
3030
3031         return 0;
3032 }
3033
3034 void
3035 SMB2_ioctl_free(struct smb_rqst *rqst)
3036 {
3037         int i;
3038         if (rqst && rqst->rq_iov) {
3039                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3040                 for (i = 1; i < rqst->rq_nvec; i++)
3041                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3042                                 kfree(rqst->rq_iov[i].iov_base);
3043         }
3044 }
3045
3046
3047 /*
3048  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
3049  */
3050 int
3051 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3052            u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen,
3053            u32 max_out_data_len, char **out_data,
3054            u32 *plen /* returned data len */)
3055 {
3056         struct smb_rqst rqst;
3057         struct smb2_ioctl_rsp *rsp = NULL;
3058         struct cifs_ses *ses;
3059         struct TCP_Server_Info *server;
3060         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3061         struct kvec rsp_iov = {NULL, 0};
3062         int resp_buftype = CIFS_NO_BUFFER;
3063         int rc = 0;
3064         int flags = 0;
3065
3066         cifs_dbg(FYI, "SMB2 IOCTL\n");
3067
3068         if (out_data != NULL)
3069                 *out_data = NULL;
3070
3071         /* zero out returned data len, in case of error */
3072         if (plen)
3073                 *plen = 0;
3074
3075         if (!tcon)
3076                 return -EIO;
3077
3078         ses = tcon->ses;
3079         if (!ses)
3080                 return -EIO;
3081
3082         server = cifs_pick_channel(ses);
3083         if (!server)
3084                 return -EIO;
3085
3086         if (smb3_encryption_required(tcon))
3087                 flags |= CIFS_TRANSFORM_REQ;
3088
3089         memset(&rqst, 0, sizeof(struct smb_rqst));
3090         memset(&iov, 0, sizeof(iov));
3091         rqst.rq_iov = iov;
3092         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3093
3094         rc = SMB2_ioctl_init(tcon, server,
3095                              &rqst, persistent_fid, volatile_fid, opcode,
3096                              in_data, indatalen, max_out_data_len);
3097         if (rc)
3098                 goto ioctl_exit;
3099
3100         rc = cifs_send_recv(xid, ses, server,
3101                             &rqst, &resp_buftype, flags,
3102                             &rsp_iov);
3103         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3104
3105         if (rc != 0)
3106                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3107                                 ses->Suid, 0, opcode, rc);
3108
3109         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3110                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3111                 goto ioctl_exit;
3112         } else if (rc == -EINVAL) {
3113                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3114                     (opcode != FSCTL_SRV_COPYCHUNK)) {
3115                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3116                         goto ioctl_exit;
3117                 }
3118         } else if (rc == -E2BIG) {
3119                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3120                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3121                         goto ioctl_exit;
3122                 }
3123         }
3124
3125         /* check if caller wants to look at return data or just return rc */
3126         if ((plen == NULL) || (out_data == NULL))
3127                 goto ioctl_exit;
3128
3129         *plen = le32_to_cpu(rsp->OutputCount);
3130
3131         /* We check for obvious errors in the output buffer length and offset */
3132         if (*plen == 0)
3133                 goto ioctl_exit; /* server returned no data */
3134         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3135                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3136                 *plen = 0;
3137                 rc = -EIO;
3138                 goto ioctl_exit;
3139         }
3140
3141         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3142                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3143                         le32_to_cpu(rsp->OutputOffset));
3144                 *plen = 0;
3145                 rc = -EIO;
3146                 goto ioctl_exit;
3147         }
3148
3149         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3150                             *plen, GFP_KERNEL);
3151         if (*out_data == NULL) {
3152                 rc = -ENOMEM;
3153                 goto ioctl_exit;
3154         }
3155
3156 ioctl_exit:
3157         SMB2_ioctl_free(&rqst);
3158         free_rsp_buf(resp_buftype, rsp);
3159         return rc;
3160 }
3161
3162 /*
3163  *   Individual callers to ioctl worker function follow
3164  */
3165
3166 int
3167 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3168                      u64 persistent_fid, u64 volatile_fid)
3169 {
3170         int rc;
3171         struct  compress_ioctl fsctl_input;
3172         char *ret_data = NULL;
3173
3174         fsctl_input.CompressionState =
3175                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3176
3177         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3178                         FSCTL_SET_COMPRESSION,
3179                         (char *)&fsctl_input /* data input */,
3180                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3181                         &ret_data /* out data */, NULL);
3182
3183         cifs_dbg(FYI, "set compression rc %d\n", rc);
3184
3185         return rc;
3186 }
3187
3188 int
3189 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3190                 struct smb_rqst *rqst,
3191                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3192 {
3193         struct smb2_close_req *req;
3194         struct kvec *iov = rqst->rq_iov;
3195         unsigned int total_len;
3196         int rc;
3197
3198         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3199                                  (void **) &req, &total_len);
3200         if (rc)
3201                 return rc;
3202
3203         req->PersistentFileId = persistent_fid;
3204         req->VolatileFileId = volatile_fid;
3205         if (query_attrs)
3206                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3207         else
3208                 req->Flags = 0;
3209         iov[0].iov_base = (char *)req;
3210         iov[0].iov_len = total_len;
3211
3212         return 0;
3213 }
3214
3215 void
3216 SMB2_close_free(struct smb_rqst *rqst)
3217 {
3218         if (rqst && rqst->rq_iov)
3219                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3220 }
3221
3222 int
3223 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3224              u64 persistent_fid, u64 volatile_fid,
3225              struct smb2_file_network_open_info *pbuf)
3226 {
3227         struct smb_rqst rqst;
3228         struct smb2_close_rsp *rsp = NULL;
3229         struct cifs_ses *ses = tcon->ses;
3230         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3231         struct kvec iov[1];
3232         struct kvec rsp_iov;
3233         int resp_buftype = CIFS_NO_BUFFER;
3234         int rc = 0;
3235         int flags = 0;
3236         bool query_attrs = false;
3237
3238         cifs_dbg(FYI, "Close\n");
3239
3240         if (!ses || !server)
3241                 return -EIO;
3242
3243         if (smb3_encryption_required(tcon))
3244                 flags |= CIFS_TRANSFORM_REQ;
3245
3246         memset(&rqst, 0, sizeof(struct smb_rqst));
3247         memset(&iov, 0, sizeof(iov));
3248         rqst.rq_iov = iov;
3249         rqst.rq_nvec = 1;
3250
3251         /* check if need to ask server to return timestamps in close response */
3252         if (pbuf)
3253                 query_attrs = true;
3254
3255         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3256         rc = SMB2_close_init(tcon, server,
3257                              &rqst, persistent_fid, volatile_fid,
3258                              query_attrs);
3259         if (rc)
3260                 goto close_exit;
3261
3262         rc = cifs_send_recv(xid, ses, server,
3263                             &rqst, &resp_buftype, flags, &rsp_iov);
3264         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3265
3266         if (rc != 0) {
3267                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3268                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3269                                      rc);
3270                 goto close_exit;
3271         } else {
3272                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3273                                       ses->Suid);
3274                 /*
3275                  * Note that have to subtract 4 since struct network_open_info
3276                  * has a final 4 byte pad that close response does not have
3277                  */
3278                 if (pbuf)
3279                         memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3280         }
3281
3282         atomic_dec(&tcon->num_remote_opens);
3283 close_exit:
3284         SMB2_close_free(&rqst);
3285         free_rsp_buf(resp_buftype, rsp);
3286
3287         /* retry close in a worker thread if this one is interrupted */
3288         if (is_interrupt_error(rc)) {
3289                 int tmp_rc;
3290
3291                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3292                                                      volatile_fid);
3293                 if (tmp_rc)
3294                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3295                                  persistent_fid, tmp_rc);
3296         }
3297         return rc;
3298 }
3299
3300 int
3301 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3302                 u64 persistent_fid, u64 volatile_fid)
3303 {
3304         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3305 }
3306
3307 int
3308 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3309                   struct kvec *iov, unsigned int min_buf_size)
3310 {
3311         unsigned int smb_len = iov->iov_len;
3312         char *end_of_smb = smb_len + (char *)iov->iov_base;
3313         char *begin_of_buf = offset + (char *)iov->iov_base;
3314         char *end_of_buf = begin_of_buf + buffer_length;
3315
3316
3317         if (buffer_length < min_buf_size) {
3318                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3319                          buffer_length, min_buf_size);
3320                 return -EINVAL;
3321         }
3322
3323         /* check if beyond RFC1001 maximum length */
3324         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3325                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3326                          buffer_length, smb_len);
3327                 return -EINVAL;
3328         }
3329
3330         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3331                 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3332                 return -EINVAL;
3333         }
3334
3335         return 0;
3336 }
3337
3338 /*
3339  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3340  * Caller must free buffer.
3341  */
3342 int
3343 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3344                            struct kvec *iov, unsigned int minbufsize,
3345                            char *data)
3346 {
3347         char *begin_of_buf = offset + (char *)iov->iov_base;
3348         int rc;
3349
3350         if (!data)
3351                 return -EINVAL;
3352
3353         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3354         if (rc)
3355                 return rc;
3356
3357         memcpy(data, begin_of_buf, buffer_length);
3358
3359         return 0;
3360 }
3361
3362 int
3363 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3364                      struct smb_rqst *rqst,
3365                      u64 persistent_fid, u64 volatile_fid,
3366                      u8 info_class, u8 info_type, u32 additional_info,
3367                      size_t output_len, size_t input_len, void *input)
3368 {
3369         struct smb2_query_info_req *req;
3370         struct kvec *iov = rqst->rq_iov;
3371         unsigned int total_len;
3372         size_t len;
3373         int rc;
3374
3375         if (unlikely(check_add_overflow(input_len, sizeof(*req), &len) ||
3376                      len > CIFSMaxBufSize))
3377                 return -EINVAL;
3378
3379         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3380                                  (void **) &req, &total_len);
3381         if (rc)
3382                 return rc;
3383
3384         req->InfoType = info_type;
3385         req->FileInfoClass = info_class;
3386         req->PersistentFileId = persistent_fid;
3387         req->VolatileFileId = volatile_fid;
3388         req->AdditionalInformation = cpu_to_le32(additional_info);
3389
3390         req->OutputBufferLength = cpu_to_le32(output_len);
3391         if (input_len) {
3392                 req->InputBufferLength = cpu_to_le32(input_len);
3393                 /* total_len for smb query request never close to le16 max */
3394                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3395                 memcpy(req->Buffer, input, input_len);
3396         }
3397
3398         iov[0].iov_base = (char *)req;
3399         /* 1 for Buffer */
3400         iov[0].iov_len = len;
3401         return 0;
3402 }
3403
3404 void
3405 SMB2_query_info_free(struct smb_rqst *rqst)
3406 {
3407         if (rqst && rqst->rq_iov)
3408                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
3409 }
3410
3411 static int
3412 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3413            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3414            u32 additional_info, size_t output_len, size_t min_len, void **data,
3415                 u32 *dlen)
3416 {
3417         struct smb_rqst rqst;
3418         struct smb2_query_info_rsp *rsp = NULL;
3419         struct kvec iov[1];
3420         struct kvec rsp_iov;
3421         int rc = 0;
3422         int resp_buftype = CIFS_NO_BUFFER;
3423         struct cifs_ses *ses = tcon->ses;
3424         struct TCP_Server_Info *server;
3425         int flags = 0;
3426         bool allocated = false;
3427
3428         cifs_dbg(FYI, "Query Info\n");
3429
3430         if (!ses)
3431                 return -EIO;
3432         server = cifs_pick_channel(ses);
3433         if (!server)
3434                 return -EIO;
3435
3436         if (smb3_encryption_required(tcon))
3437                 flags |= CIFS_TRANSFORM_REQ;
3438
3439         memset(&rqst, 0, sizeof(struct smb_rqst));
3440         memset(&iov, 0, sizeof(iov));
3441         rqst.rq_iov = iov;
3442         rqst.rq_nvec = 1;
3443
3444         rc = SMB2_query_info_init(tcon, server,
3445                                   &rqst, persistent_fid, volatile_fid,
3446                                   info_class, info_type, additional_info,
3447                                   output_len, 0, NULL);
3448         if (rc)
3449                 goto qinf_exit;
3450
3451         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3452                                     ses->Suid, info_class, (__u32)info_type);
3453
3454         rc = cifs_send_recv(xid, ses, server,
3455                             &rqst, &resp_buftype, flags, &rsp_iov);
3456         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3457
3458         if (rc) {
3459                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3460                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3461                                 ses->Suid, info_class, (__u32)info_type, rc);
3462                 goto qinf_exit;
3463         }
3464
3465         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3466                                 ses->Suid, info_class, (__u32)info_type);
3467
3468         if (dlen) {
3469                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3470                 if (!*data) {
3471                         *data = kmalloc(*dlen, GFP_KERNEL);
3472                         if (!*data) {
3473                                 cifs_tcon_dbg(VFS,
3474                                         "Error %d allocating memory for acl\n",
3475                                         rc);
3476                                 *dlen = 0;
3477                                 rc = -ENOMEM;
3478                                 goto qinf_exit;
3479                         }
3480                         allocated = true;
3481                 }
3482         }
3483
3484         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3485                                         le32_to_cpu(rsp->OutputBufferLength),
3486                                         &rsp_iov, min_len, *data);
3487         if (rc && allocated) {
3488                 kfree(*data);
3489                 *data = NULL;
3490                 *dlen = 0;
3491         }
3492
3493 qinf_exit:
3494         SMB2_query_info_free(&rqst);
3495         free_rsp_buf(resp_buftype, rsp);
3496         return rc;
3497 }
3498
3499 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3500         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3501 {
3502         return query_info(xid, tcon, persistent_fid, volatile_fid,
3503                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3504                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3505                           sizeof(struct smb2_file_all_info), (void **)&data,
3506                           NULL);
3507 }
3508
3509 int
3510 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3511                 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3512 {
3513         size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3514                         (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3515         *plen = 0;
3516
3517         return query_info(xid, tcon, persistent_fid, volatile_fid,
3518                           SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3519                           output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3520 }
3521
3522 int
3523 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3524                 u64 persistent_fid, u64 volatile_fid,
3525                 void **data, u32 *plen)
3526 {
3527         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
3528         *plen = 0;
3529
3530         return query_info(xid, tcon, persistent_fid, volatile_fid,
3531                           0, SMB2_O_INFO_SECURITY, additional_info,
3532                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3533 }
3534
3535 int
3536 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3537                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3538 {
3539         return query_info(xid, tcon, persistent_fid, volatile_fid,
3540                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3541                           sizeof(struct smb2_file_internal_info),
3542                           sizeof(struct smb2_file_internal_info),
3543                           (void **)&uniqueid, NULL);
3544 }
3545
3546 /*
3547  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3548  * See MS-SMB2 2.2.35 and 2.2.36
3549  */
3550
3551 static int
3552 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3553                  struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3554                  u64 persistent_fid, u64 volatile_fid,
3555                  u32 completion_filter, bool watch_tree)
3556 {
3557         struct smb2_change_notify_req *req;
3558         struct kvec *iov = rqst->rq_iov;
3559         unsigned int total_len;
3560         int rc;
3561
3562         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3563                                  (void **) &req, &total_len);
3564         if (rc)
3565                 return rc;
3566
3567         req->PersistentFileId = persistent_fid;
3568         req->VolatileFileId = volatile_fid;
3569         /* See note 354 of MS-SMB2, 64K max */
3570         req->OutputBufferLength =
3571                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3572         req->CompletionFilter = cpu_to_le32(completion_filter);
3573         if (watch_tree)
3574                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3575         else
3576                 req->Flags = 0;
3577
3578         iov[0].iov_base = (char *)req;
3579         iov[0].iov_len = total_len;
3580
3581         return 0;
3582 }
3583
3584 int
3585 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3586                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3587                 u32 completion_filter)
3588 {
3589         struct cifs_ses *ses = tcon->ses;
3590         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3591         struct smb_rqst rqst;
3592         struct kvec iov[1];
3593         struct kvec rsp_iov = {NULL, 0};
3594         int resp_buftype = CIFS_NO_BUFFER;
3595         int flags = 0;
3596         int rc = 0;
3597
3598         cifs_dbg(FYI, "change notify\n");
3599         if (!ses || !server)
3600                 return -EIO;
3601
3602         if (smb3_encryption_required(tcon))
3603                 flags |= CIFS_TRANSFORM_REQ;
3604
3605         memset(&rqst, 0, sizeof(struct smb_rqst));
3606         memset(&iov, 0, sizeof(iov));
3607         rqst.rq_iov = iov;
3608         rqst.rq_nvec = 1;
3609
3610         rc = SMB2_notify_init(xid, &rqst, tcon, server,
3611                               persistent_fid, volatile_fid,
3612                               completion_filter, watch_tree);
3613         if (rc)
3614                 goto cnotify_exit;
3615
3616         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3617                                 (u8)watch_tree, completion_filter);
3618         rc = cifs_send_recv(xid, ses, server,
3619                             &rqst, &resp_buftype, flags, &rsp_iov);
3620
3621         if (rc != 0) {
3622                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3623                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3624                                 (u8)watch_tree, completion_filter, rc);
3625         } else
3626                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3627                                 ses->Suid, (u8)watch_tree, completion_filter);
3628
3629  cnotify_exit:
3630         if (rqst.rq_iov)
3631                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3632         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3633         return rc;
3634 }
3635
3636
3637
3638 /*
3639  * This is a no-op for now. We're not really interested in the reply, but
3640  * rather in the fact that the server sent one and that server->lstrp
3641  * gets updated.
3642  *
3643  * FIXME: maybe we should consider checking that the reply matches request?
3644  */
3645 static void
3646 smb2_echo_callback(struct mid_q_entry *mid)
3647 {
3648         struct TCP_Server_Info *server = mid->callback_data;
3649         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3650         struct cifs_credits credits = { .value = 0, .instance = 0 };
3651
3652         if (mid->mid_state == MID_RESPONSE_RECEIVED
3653             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3654                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3655                 credits.instance = server->reconnect_instance;
3656         }
3657
3658         DeleteMidQEntry(mid);
3659         add_credits(server, &credits, CIFS_ECHO_OP);
3660 }
3661
3662 void smb2_reconnect_server(struct work_struct *work)
3663 {
3664         struct TCP_Server_Info *server = container_of(work,
3665                                         struct TCP_Server_Info, reconnect.work);
3666         struct cifs_ses *ses;
3667         struct cifs_tcon *tcon, *tcon2;
3668         struct list_head tmp_list;
3669         int tcon_exist = false;
3670         int rc;
3671         int resched = false;
3672
3673
3674         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3675         mutex_lock(&server->reconnect_mutex);
3676
3677         INIT_LIST_HEAD(&tmp_list);
3678         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3679
3680         spin_lock(&cifs_tcp_ses_lock);
3681         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3682                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3683                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3684                                 tcon->tc_count++;
3685                                 list_add_tail(&tcon->rlist, &tmp_list);
3686                                 tcon_exist = true;
3687                         }
3688                 }
3689                 /*
3690                  * IPC has the same lifetime as its session and uses its
3691                  * refcount.
3692                  */
3693                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3694                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3695                         tcon_exist = true;
3696                         ses->ses_count++;
3697                 }
3698         }
3699         /*
3700          * Get the reference to server struct to be sure that the last call of
3701          * cifs_put_tcon() in the loop below won't release the server pointer.
3702          */
3703         if (tcon_exist)
3704                 server->srv_count++;
3705
3706         spin_unlock(&cifs_tcp_ses_lock);
3707
3708         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3709                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3710                 if (!rc)
3711                         cifs_reopen_persistent_handles(tcon);
3712                 else
3713                         resched = true;
3714                 list_del_init(&tcon->rlist);
3715                 if (tcon->ipc)
3716                         cifs_put_smb_ses(tcon->ses);
3717                 else
3718                         cifs_put_tcon(tcon);
3719         }
3720
3721         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3722         if (resched)
3723                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3724         mutex_unlock(&server->reconnect_mutex);
3725
3726         /* now we can safely release srv struct */
3727         if (tcon_exist)
3728                 cifs_put_tcp_session(server, 1);
3729 }
3730
3731 int
3732 SMB2_echo(struct TCP_Server_Info *server)
3733 {
3734         struct smb2_echo_req *req;
3735         int rc = 0;
3736         struct kvec iov[1];
3737         struct smb_rqst rqst = { .rq_iov = iov,
3738                                  .rq_nvec = 1 };
3739         unsigned int total_len;
3740
3741         cifs_dbg(FYI, "In echo request\n");
3742
3743         if (server->tcpStatus == CifsNeedNegotiate) {
3744                 /* No need to send echo on newly established connections */
3745                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
3746                 return rc;
3747         }
3748
3749         rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
3750                                  (void **)&req, &total_len);
3751         if (rc)
3752                 return rc;
3753
3754         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3755
3756         iov[0].iov_len = total_len;
3757         iov[0].iov_base = (char *)req;
3758
3759         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3760                              server, CIFS_ECHO_OP, NULL);
3761         if (rc)
3762                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3763
3764         cifs_small_buf_release(req);
3765         return rc;
3766 }
3767
3768 void
3769 SMB2_flush_free(struct smb_rqst *rqst)
3770 {
3771         if (rqst && rqst->rq_iov)
3772                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3773 }
3774
3775 int
3776 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3777                 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3778                 u64 persistent_fid, u64 volatile_fid)
3779 {
3780         struct smb2_flush_req *req;
3781         struct kvec *iov = rqst->rq_iov;
3782         unsigned int total_len;
3783         int rc;
3784
3785         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
3786                                  (void **) &req, &total_len);
3787         if (rc)
3788                 return rc;
3789
3790         req->PersistentFileId = persistent_fid;
3791         req->VolatileFileId = volatile_fid;
3792
3793         iov[0].iov_base = (char *)req;
3794         iov[0].iov_len = total_len;
3795
3796         return 0;
3797 }
3798
3799 int
3800 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3801            u64 volatile_fid)
3802 {
3803         struct cifs_ses *ses = tcon->ses;
3804         struct smb_rqst rqst;
3805         struct kvec iov[1];
3806         struct kvec rsp_iov = {NULL, 0};
3807         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3808         int resp_buftype = CIFS_NO_BUFFER;
3809         int flags = 0;
3810         int rc = 0;
3811
3812         cifs_dbg(FYI, "flush\n");
3813         if (!ses || !(ses->server))
3814                 return -EIO;
3815
3816         if (smb3_encryption_required(tcon))
3817                 flags |= CIFS_TRANSFORM_REQ;
3818
3819         memset(&rqst, 0, sizeof(struct smb_rqst));
3820         memset(&iov, 0, sizeof(iov));
3821         rqst.rq_iov = iov;
3822         rqst.rq_nvec = 1;
3823
3824         rc = SMB2_flush_init(xid, &rqst, tcon, server,
3825                              persistent_fid, volatile_fid);
3826         if (rc)
3827                 goto flush_exit;
3828
3829         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3830         rc = cifs_send_recv(xid, ses, server,
3831                             &rqst, &resp_buftype, flags, &rsp_iov);
3832
3833         if (rc != 0) {
3834                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3835                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3836                                      rc);
3837         } else
3838                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
3839                                       ses->Suid);
3840
3841  flush_exit:
3842         SMB2_flush_free(&rqst);
3843         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3844         return rc;
3845 }
3846
3847 /*
3848  * To form a chain of read requests, any read requests after the first should
3849  * have the end_of_chain boolean set to true.
3850  */
3851 static int
3852 smb2_new_read_req(void **buf, unsigned int *total_len,
3853         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3854         unsigned int remaining_bytes, int request_type)
3855 {
3856         int rc = -EACCES;
3857         struct smb2_read_plain_req *req = NULL;
3858         struct smb2_sync_hdr *shdr;
3859         struct TCP_Server_Info *server = io_parms->server;
3860
3861         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
3862                                  (void **) &req, total_len);
3863         if (rc)
3864                 return rc;
3865
3866         if (server == NULL)
3867                 return -ECONNABORTED;
3868
3869         shdr = &req->sync_hdr;
3870         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3871
3872         req->PersistentFileId = io_parms->persistent_fid;
3873         req->VolatileFileId = io_parms->volatile_fid;
3874         req->ReadChannelInfoOffset = 0; /* reserved */
3875         req->ReadChannelInfoLength = 0; /* reserved */
3876         req->Channel = 0; /* reserved */
3877         req->MinimumCount = 0;
3878         req->Length = cpu_to_le32(io_parms->length);
3879         req->Offset = cpu_to_le64(io_parms->offset);
3880
3881         trace_smb3_read_enter(0 /* xid */,
3882                         io_parms->persistent_fid,
3883                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3884                         io_parms->offset, io_parms->length);
3885 #ifdef CONFIG_CIFS_SMB_DIRECT
3886         /*
3887          * If we want to do a RDMA write, fill in and append
3888          * smbd_buffer_descriptor_v1 to the end of read request
3889          */
3890         if (server->rdma && rdata && !server->sign &&
3891                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3892
3893                 struct smbd_buffer_descriptor_v1 *v1;
3894                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3895
3896                 rdata->mr = smbd_register_mr(
3897                                 server->smbd_conn, rdata->pages,
3898                                 rdata->nr_pages, rdata->page_offset,
3899                                 rdata->tailsz, true, need_invalidate);
3900                 if (!rdata->mr)
3901                         return -EAGAIN;
3902
3903                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3904                 if (need_invalidate)
3905                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3906                 req->ReadChannelInfoOffset =
3907                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3908                 req->ReadChannelInfoLength =
3909                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3910                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3911                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3912                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3913                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3914
3915                 *total_len += sizeof(*v1) - 1;
3916         }
3917 #endif
3918         if (request_type & CHAINED_REQUEST) {
3919                 if (!(request_type & END_OF_CHAIN)) {
3920                         /* next 8-byte aligned request */
3921                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3922                         shdr->NextCommand = cpu_to_le32(*total_len);
3923                 } else /* END_OF_CHAIN */
3924                         shdr->NextCommand = 0;
3925                 if (request_type & RELATED_REQUEST) {
3926                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3927                         /*
3928                          * Related requests use info from previous read request
3929                          * in chain.
3930                          */
3931                         shdr->SessionId = 0xFFFFFFFFFFFFFFFF;
3932                         shdr->TreeId = 0xFFFFFFFF;
3933                         req->PersistentFileId = 0xFFFFFFFFFFFFFFFF;
3934                         req->VolatileFileId = 0xFFFFFFFFFFFFFFFF;
3935                 }
3936         }
3937         if (remaining_bytes > io_parms->length)
3938                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3939         else
3940                 req->RemainingBytes = 0;
3941
3942         *buf = req;
3943         return rc;
3944 }
3945
3946 static void
3947 smb2_readv_callback(struct mid_q_entry *mid)
3948 {
3949         struct cifs_readdata *rdata = mid->callback_data;
3950         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3951         struct TCP_Server_Info *server = rdata->server;
3952         struct smb2_sync_hdr *shdr =
3953                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3954         struct cifs_credits credits = { .value = 0, .instance = 0 };
3955         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
3956                                  .rq_nvec = 1, };
3957
3958         if (rdata->got_bytes) {
3959                 rqst.rq_pages = rdata->pages;
3960                 rqst.rq_offset = rdata->page_offset;
3961                 rqst.rq_npages = rdata->nr_pages;
3962                 rqst.rq_pagesz = rdata->pagesz;
3963                 rqst.rq_tailsz = rdata->tailsz;
3964         }
3965
3966         WARN_ONCE(rdata->server != mid->server,
3967                   "rdata server %p != mid server %p",
3968                   rdata->server, mid->server);
3969
3970         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3971                  __func__, mid->mid, mid->mid_state, rdata->result,
3972                  rdata->bytes);
3973
3974         switch (mid->mid_state) {
3975         case MID_RESPONSE_RECEIVED:
3976                 credits.value = le16_to_cpu(shdr->CreditRequest);
3977                 credits.instance = server->reconnect_instance;
3978                 /* result already set, check signature */
3979                 if (server->sign && !mid->decrypted) {
3980                         int rc;
3981
3982                         rc = smb2_verify_signature(&rqst, server);
3983                         if (rc)
3984                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
3985                                          rc);
3986                 }
3987                 /* FIXME: should this be counted toward the initiating task? */
3988                 task_io_account_read(rdata->got_bytes);
3989                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3990                 break;
3991         case MID_REQUEST_SUBMITTED:
3992         case MID_RETRY_NEEDED:
3993                 rdata->result = -EAGAIN;
3994                 if (server->sign && rdata->got_bytes)
3995                         /* reset bytes number since we can not check a sign */
3996                         rdata->got_bytes = 0;
3997                 /* FIXME: should this be counted toward the initiating task? */
3998                 task_io_account_read(rdata->got_bytes);
3999                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4000                 break;
4001         case MID_RESPONSE_MALFORMED:
4002                 credits.value = le16_to_cpu(shdr->CreditRequest);
4003                 credits.instance = server->reconnect_instance;
4004                 fallthrough;
4005         default:
4006                 rdata->result = -EIO;
4007         }
4008 #ifdef CONFIG_CIFS_SMB_DIRECT
4009         /*
4010          * If this rdata has a memmory registered, the MR can be freed
4011          * MR needs to be freed as soon as I/O finishes to prevent deadlock
4012          * because they have limited number and are used for future I/Os
4013          */
4014         if (rdata->mr) {
4015                 smbd_deregister_mr(rdata->mr);
4016                 rdata->mr = NULL;
4017         }
4018 #endif
4019         if (rdata->result && rdata->result != -ENODATA) {
4020                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
4021                 trace_smb3_read_err(0 /* xid */,
4022                                     rdata->cfile->fid.persistent_fid,
4023                                     tcon->tid, tcon->ses->Suid, rdata->offset,
4024                                     rdata->bytes, rdata->result);
4025         } else
4026                 trace_smb3_read_done(0 /* xid */,
4027                                      rdata->cfile->fid.persistent_fid,
4028                                      tcon->tid, tcon->ses->Suid,
4029                                      rdata->offset, rdata->got_bytes);
4030
4031         queue_work(cifsiod_wq, &rdata->work);
4032         DeleteMidQEntry(mid);
4033         add_credits(server, &credits, 0);
4034 }
4035
4036 /* smb2_async_readv - send an async read, and set up mid to handle result */
4037 int
4038 smb2_async_readv(struct cifs_readdata *rdata)
4039 {
4040         int rc, flags = 0;
4041         char *buf;
4042         struct smb2_sync_hdr *shdr;
4043         struct cifs_io_parms io_parms;
4044         struct smb_rqst rqst = { .rq_iov = rdata->iov,
4045                                  .rq_nvec = 1 };
4046         struct TCP_Server_Info *server;
4047         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4048         unsigned int total_len;
4049
4050         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
4051                  __func__, rdata->offset, rdata->bytes);
4052
4053         if (!rdata->server)
4054                 rdata->server = cifs_pick_channel(tcon->ses);
4055
4056         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
4057         io_parms.server = server = rdata->server;
4058         io_parms.offset = rdata->offset;
4059         io_parms.length = rdata->bytes;
4060         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
4061         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
4062         io_parms.pid = rdata->pid;
4063
4064         rc = smb2_new_read_req(
4065                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4066         if (rc)
4067                 return rc;
4068
4069         if (smb3_encryption_required(io_parms.tcon))
4070                 flags |= CIFS_TRANSFORM_REQ;
4071
4072         rdata->iov[0].iov_base = buf;
4073         rdata->iov[0].iov_len = total_len;
4074
4075         shdr = (struct smb2_sync_hdr *)buf;
4076
4077         if (rdata->credits.value > 0) {
4078                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
4079                                                 SMB2_MAX_BUFFER_SIZE));
4080                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4081
4082                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
4083                 if (rc)
4084                         goto async_readv_out;
4085
4086                 flags |= CIFS_HAS_CREDITS;
4087         }
4088
4089         kref_get(&rdata->refcount);
4090         rc = cifs_call_async(server, &rqst,
4091                              cifs_readv_receive, smb2_readv_callback,
4092                              smb3_handle_read_data, rdata, flags,
4093                              &rdata->credits);
4094         if (rc) {
4095                 kref_put(&rdata->refcount, cifs_readdata_release);
4096                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4097                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4098                                     io_parms.tcon->tid,
4099                                     io_parms.tcon->ses->Suid,
4100                                     io_parms.offset, io_parms.length, rc);
4101         }
4102
4103 async_readv_out:
4104         cifs_small_buf_release(buf);
4105         return rc;
4106 }
4107
4108 int
4109 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4110           unsigned int *nbytes, char **buf, int *buf_type)
4111 {
4112         struct smb_rqst rqst;
4113         int resp_buftype, rc;
4114         struct smb2_read_plain_req *req = NULL;
4115         struct smb2_read_rsp *rsp = NULL;
4116         struct kvec iov[1];
4117         struct kvec rsp_iov;
4118         unsigned int total_len;
4119         int flags = CIFS_LOG_ERROR;
4120         struct cifs_ses *ses = io_parms->tcon->ses;
4121
4122         if (!io_parms->server)
4123                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4124
4125         *nbytes = 0;
4126         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4127         if (rc)
4128                 return rc;
4129
4130         if (smb3_encryption_required(io_parms->tcon))
4131                 flags |= CIFS_TRANSFORM_REQ;
4132
4133         iov[0].iov_base = (char *)req;
4134         iov[0].iov_len = total_len;
4135
4136         memset(&rqst, 0, sizeof(struct smb_rqst));
4137         rqst.rq_iov = iov;
4138         rqst.rq_nvec = 1;
4139
4140         rc = cifs_send_recv(xid, ses, io_parms->server,
4141                             &rqst, &resp_buftype, flags, &rsp_iov);
4142         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4143
4144         if (rc) {
4145                 if (rc != -ENODATA) {
4146                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4147                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
4148                         trace_smb3_read_err(xid, req->PersistentFileId,
4149                                             io_parms->tcon->tid, ses->Suid,
4150                                             io_parms->offset, io_parms->length,
4151                                             rc);
4152                 } else
4153                         trace_smb3_read_done(xid, req->PersistentFileId,
4154                                     io_parms->tcon->tid, ses->Suid,
4155                                     io_parms->offset, 0);
4156                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4157                 cifs_small_buf_release(req);
4158                 return rc == -ENODATA ? 0 : rc;
4159         } else
4160                 trace_smb3_read_done(xid, req->PersistentFileId,
4161                                     io_parms->tcon->tid, ses->Suid,
4162                                     io_parms->offset, io_parms->length);
4163
4164         cifs_small_buf_release(req);
4165
4166         *nbytes = le32_to_cpu(rsp->DataLength);
4167         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4168             (*nbytes > io_parms->length)) {
4169                 cifs_dbg(FYI, "bad length %d for count %d\n",
4170                          *nbytes, io_parms->length);
4171                 rc = -EIO;
4172                 *nbytes = 0;
4173         }
4174
4175         if (*buf) {
4176                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4177                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4178         } else if (resp_buftype != CIFS_NO_BUFFER) {
4179                 *buf = rsp_iov.iov_base;
4180                 if (resp_buftype == CIFS_SMALL_BUFFER)
4181                         *buf_type = CIFS_SMALL_BUFFER;
4182                 else if (resp_buftype == CIFS_LARGE_BUFFER)
4183                         *buf_type = CIFS_LARGE_BUFFER;
4184         }
4185         return rc;
4186 }
4187
4188 /*
4189  * Check the mid_state and signature on received buffer (if any), and queue the
4190  * workqueue completion task.
4191  */
4192 static void
4193 smb2_writev_callback(struct mid_q_entry *mid)
4194 {
4195         struct cifs_writedata *wdata = mid->callback_data;
4196         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4197         struct TCP_Server_Info *server = wdata->server;
4198         unsigned int written;
4199         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4200         struct cifs_credits credits = { .value = 0, .instance = 0 };
4201
4202         WARN_ONCE(wdata->server != mid->server,
4203                   "wdata server %p != mid server %p",
4204                   wdata->server, mid->server);
4205
4206         switch (mid->mid_state) {
4207         case MID_RESPONSE_RECEIVED:
4208                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4209                 credits.instance = server->reconnect_instance;
4210                 wdata->result = smb2_check_receive(mid, server, 0);
4211                 if (wdata->result != 0)
4212                         break;
4213
4214                 written = le32_to_cpu(rsp->DataLength);
4215                 /*
4216                  * Mask off high 16 bits when bytes written as returned
4217                  * by the server is greater than bytes requested by the
4218                  * client. OS/2 servers are known to set incorrect
4219                  * CountHigh values.
4220                  */
4221                 if (written > wdata->bytes)
4222                         written &= 0xFFFF;
4223
4224                 if (written < wdata->bytes)
4225                         wdata->result = -ENOSPC;
4226                 else
4227                         wdata->bytes = written;
4228                 break;
4229         case MID_REQUEST_SUBMITTED:
4230         case MID_RETRY_NEEDED:
4231                 wdata->result = -EAGAIN;
4232                 break;
4233         case MID_RESPONSE_MALFORMED:
4234                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4235                 credits.instance = server->reconnect_instance;
4236                 fallthrough;
4237         default:
4238                 wdata->result = -EIO;
4239                 break;
4240         }
4241 #ifdef CONFIG_CIFS_SMB_DIRECT
4242         /*
4243          * If this wdata has a memory registered, the MR can be freed
4244          * The number of MRs available is limited, it's important to recover
4245          * used MR as soon as I/O is finished. Hold MR longer in the later
4246          * I/O process can possibly result in I/O deadlock due to lack of MR
4247          * to send request on I/O retry
4248          */
4249         if (wdata->mr) {
4250                 smbd_deregister_mr(wdata->mr);
4251                 wdata->mr = NULL;
4252         }
4253 #endif
4254         if (wdata->result) {
4255                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4256                 trace_smb3_write_err(0 /* no xid */,
4257                                      wdata->cfile->fid.persistent_fid,
4258                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4259                                      wdata->bytes, wdata->result);
4260                 if (wdata->result == -ENOSPC)
4261                         pr_warn_once("Out of space writing to %s\n",
4262                                      tcon->treeName);
4263         } else
4264                 trace_smb3_write_done(0 /* no xid */,
4265                                       wdata->cfile->fid.persistent_fid,
4266                                       tcon->tid, tcon->ses->Suid,
4267                                       wdata->offset, wdata->bytes);
4268
4269         queue_work(cifsiod_wq, &wdata->work);
4270         DeleteMidQEntry(mid);
4271         add_credits(server, &credits, 0);
4272 }
4273
4274 /* smb2_async_writev - send an async write, and set up mid to handle result */
4275 int
4276 smb2_async_writev(struct cifs_writedata *wdata,
4277                   void (*release)(struct kref *kref))
4278 {
4279         int rc = -EACCES, flags = 0;
4280         struct smb2_write_req *req = NULL;
4281         struct smb2_sync_hdr *shdr;
4282         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4283         struct TCP_Server_Info *server = wdata->server;
4284         struct kvec iov[1];
4285         struct smb_rqst rqst = { };
4286         unsigned int total_len;
4287
4288         if (!wdata->server)
4289                 server = wdata->server = cifs_pick_channel(tcon->ses);
4290
4291         rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4292                                  (void **) &req, &total_len);
4293         if (rc)
4294                 return rc;
4295
4296         if (smb3_encryption_required(tcon))
4297                 flags |= CIFS_TRANSFORM_REQ;
4298
4299         shdr = (struct smb2_sync_hdr *)req;
4300         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
4301
4302         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
4303         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
4304         req->WriteChannelInfoOffset = 0;
4305         req->WriteChannelInfoLength = 0;
4306         req->Channel = 0;
4307         req->Offset = cpu_to_le64(wdata->offset);
4308         req->DataOffset = cpu_to_le16(
4309                                 offsetof(struct smb2_write_req, Buffer));
4310         req->RemainingBytes = 0;
4311
4312         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
4313                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
4314 #ifdef CONFIG_CIFS_SMB_DIRECT
4315         /*
4316          * If we want to do a server RDMA read, fill in and append
4317          * smbd_buffer_descriptor_v1 to the end of write request
4318          */
4319         if (server->rdma && !server->sign && wdata->bytes >=
4320                 server->smbd_conn->rdma_readwrite_threshold) {
4321
4322                 struct smbd_buffer_descriptor_v1 *v1;
4323                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4324
4325                 wdata->mr = smbd_register_mr(
4326                                 server->smbd_conn, wdata->pages,
4327                                 wdata->nr_pages, wdata->page_offset,
4328                                 wdata->tailsz, false, need_invalidate);
4329                 if (!wdata->mr) {
4330                         rc = -EAGAIN;
4331                         goto async_writev_out;
4332                 }
4333                 req->Length = 0;
4334                 req->DataOffset = 0;
4335                 if (wdata->nr_pages > 1)
4336                         req->RemainingBytes =
4337                                 cpu_to_le32(
4338                                         (wdata->nr_pages - 1) * wdata->pagesz -
4339                                         wdata->page_offset + wdata->tailsz
4340                                 );
4341                 else
4342                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
4343                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4344                 if (need_invalidate)
4345                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4346                 req->WriteChannelInfoOffset =
4347                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4348                 req->WriteChannelInfoLength =
4349                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4350                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4351                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4352                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4353                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4354         }
4355 #endif
4356         iov[0].iov_len = total_len - 1;
4357         iov[0].iov_base = (char *)req;
4358
4359         rqst.rq_iov = iov;
4360         rqst.rq_nvec = 1;
4361         rqst.rq_pages = wdata->pages;
4362         rqst.rq_offset = wdata->page_offset;
4363         rqst.rq_npages = wdata->nr_pages;
4364         rqst.rq_pagesz = wdata->pagesz;
4365         rqst.rq_tailsz = wdata->tailsz;
4366 #ifdef CONFIG_CIFS_SMB_DIRECT
4367         if (wdata->mr) {
4368                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4369                 rqst.rq_npages = 0;
4370         }
4371 #endif
4372         cifs_dbg(FYI, "async write at %llu %u bytes\n",
4373                  wdata->offset, wdata->bytes);
4374
4375 #ifdef CONFIG_CIFS_SMB_DIRECT
4376         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4377         if (!wdata->mr)
4378                 req->Length = cpu_to_le32(wdata->bytes);
4379 #else
4380         req->Length = cpu_to_le32(wdata->bytes);
4381 #endif
4382
4383         if (wdata->credits.value > 0) {
4384                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4385                                                     SMB2_MAX_BUFFER_SIZE));
4386                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4387
4388                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4389                 if (rc)
4390                         goto async_writev_out;
4391
4392                 flags |= CIFS_HAS_CREDITS;
4393         }
4394
4395         kref_get(&wdata->refcount);
4396         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4397                              wdata, flags, &wdata->credits);
4398
4399         if (rc) {
4400                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
4401                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4402                                      wdata->bytes, rc);
4403                 kref_put(&wdata->refcount, release);
4404                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4405         }
4406
4407 async_writev_out:
4408         cifs_small_buf_release(req);
4409         return rc;
4410 }
4411
4412 /*
4413  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4414  * The length field from io_parms must be at least 1 and indicates a number of
4415  * elements with data to write that begins with position 1 in iov array. All
4416  * data length is specified by count.
4417  */
4418 int
4419 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4420            unsigned int *nbytes, struct kvec *iov, int n_vec)
4421 {
4422         struct smb_rqst rqst;
4423         int rc = 0;
4424         struct smb2_write_req *req = NULL;
4425         struct smb2_write_rsp *rsp = NULL;
4426         int resp_buftype;
4427         struct kvec rsp_iov;
4428         int flags = 0;
4429         unsigned int total_len;
4430         struct TCP_Server_Info *server;
4431
4432         *nbytes = 0;
4433
4434         if (n_vec < 1)
4435                 return rc;
4436
4437         if (!io_parms->server)
4438                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4439         server = io_parms->server;
4440         if (server == NULL)
4441                 return -ECONNABORTED;
4442
4443         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
4444                                  (void **) &req, &total_len);
4445         if (rc)
4446                 return rc;
4447
4448         if (smb3_encryption_required(io_parms->tcon))
4449                 flags |= CIFS_TRANSFORM_REQ;
4450
4451         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
4452
4453         req->PersistentFileId = io_parms->persistent_fid;
4454         req->VolatileFileId = io_parms->volatile_fid;
4455         req->WriteChannelInfoOffset = 0;
4456         req->WriteChannelInfoLength = 0;
4457         req->Channel = 0;
4458         req->Length = cpu_to_le32(io_parms->length);
4459         req->Offset = cpu_to_le64(io_parms->offset);
4460         req->DataOffset = cpu_to_le16(
4461                                 offsetof(struct smb2_write_req, Buffer));
4462         req->RemainingBytes = 0;
4463
4464         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4465                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4466                 io_parms->offset, io_parms->length);
4467
4468         iov[0].iov_base = (char *)req;
4469         /* 1 for Buffer */
4470         iov[0].iov_len = total_len - 1;
4471
4472         memset(&rqst, 0, sizeof(struct smb_rqst));
4473         rqst.rq_iov = iov;
4474         rqst.rq_nvec = n_vec + 1;
4475
4476         rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
4477                             &rqst,
4478                             &resp_buftype, flags, &rsp_iov);
4479         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4480
4481         if (rc) {
4482                 trace_smb3_write_err(xid, req->PersistentFileId,
4483                                      io_parms->tcon->tid,
4484                                      io_parms->tcon->ses->Suid,
4485                                      io_parms->offset, io_parms->length, rc);
4486                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4487                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4488         } else {
4489                 *nbytes = le32_to_cpu(rsp->DataLength);
4490                 trace_smb3_write_done(xid, req->PersistentFileId,
4491                                      io_parms->tcon->tid,
4492                                      io_parms->tcon->ses->Suid,
4493                                      io_parms->offset, *nbytes);
4494         }
4495
4496         cifs_small_buf_release(req);
4497         free_rsp_buf(resp_buftype, rsp);
4498         return rc;
4499 }
4500
4501 int posix_info_sid_size(const void *beg, const void *end)
4502 {
4503         size_t subauth;
4504         int total;
4505
4506         if (beg + 1 > end)
4507                 return -1;
4508
4509         subauth = *(u8 *)(beg+1);
4510         if (subauth < 1 || subauth > 15)
4511                 return -1;
4512
4513         total = 1 + 1 + 6 + 4*subauth;
4514         if (beg + total > end)
4515                 return -1;
4516
4517         return total;
4518 }
4519
4520 int posix_info_parse(const void *beg, const void *end,
4521                      struct smb2_posix_info_parsed *out)
4522
4523 {
4524         int total_len = 0;
4525         int sid_len;
4526         int name_len;
4527         const void *owner_sid;
4528         const void *group_sid;
4529         const void *name;
4530
4531         /* if no end bound given, assume payload to be correct */
4532         if (!end) {
4533                 const struct smb2_posix_info *p = beg;
4534
4535                 end = beg + le32_to_cpu(p->NextEntryOffset);
4536                 /* last element will have a 0 offset, pick a sensible bound */
4537                 if (end == beg)
4538                         end += 0xFFFF;
4539         }
4540
4541         /* check base buf */
4542         if (beg + sizeof(struct smb2_posix_info) > end)
4543                 return -1;
4544         total_len = sizeof(struct smb2_posix_info);
4545
4546         /* check owner sid */
4547         owner_sid = beg + total_len;
4548         sid_len = posix_info_sid_size(owner_sid, end);
4549         if (sid_len < 0)
4550                 return -1;
4551         total_len += sid_len;
4552
4553         /* check group sid */
4554         group_sid = beg + total_len;
4555         sid_len = posix_info_sid_size(group_sid, end);
4556         if (sid_len < 0)
4557                 return -1;
4558         total_len += sid_len;
4559
4560         /* check name len */
4561         if (beg + total_len + 4 > end)
4562                 return -1;
4563         name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
4564         if (name_len < 1 || name_len > 0xFFFF)
4565                 return -1;
4566         total_len += 4;
4567
4568         /* check name */
4569         name = beg + total_len;
4570         if (name + name_len > end)
4571                 return -1;
4572         total_len += name_len;
4573
4574         if (out) {
4575                 out->base = beg;
4576                 out->size = total_len;
4577                 out->name_len = name_len;
4578                 out->name = name;
4579                 memcpy(&out->owner, owner_sid,
4580                        posix_info_sid_size(owner_sid, end));
4581                 memcpy(&out->group, group_sid,
4582                        posix_info_sid_size(group_sid, end));
4583         }
4584         return total_len;
4585 }
4586
4587 static int posix_info_extra_size(const void *beg, const void *end)
4588 {
4589         int len = posix_info_parse(beg, end, NULL);
4590
4591         if (len < 0)
4592                 return -1;
4593         return len - sizeof(struct smb2_posix_info);
4594 }
4595
4596 static unsigned int
4597 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
4598             size_t size)
4599 {
4600         int len;
4601         unsigned int entrycount = 0;
4602         unsigned int next_offset = 0;
4603         char *entryptr;
4604         FILE_DIRECTORY_INFO *dir_info;
4605
4606         if (bufstart == NULL)
4607                 return 0;
4608
4609         entryptr = bufstart;
4610
4611         while (1) {
4612                 if (entryptr + next_offset < entryptr ||
4613                     entryptr + next_offset > end_of_buf ||
4614                     entryptr + next_offset + size > end_of_buf) {
4615                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4616                         break;
4617                 }
4618
4619                 entryptr = entryptr + next_offset;
4620                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4621
4622                 if (infotype == SMB_FIND_FILE_POSIX_INFO)
4623                         len = posix_info_extra_size(entryptr, end_of_buf);
4624                 else
4625                         len = le32_to_cpu(dir_info->FileNameLength);
4626
4627                 if (len < 0 ||
4628                     entryptr + len < entryptr ||
4629                     entryptr + len > end_of_buf ||
4630                     entryptr + len + size > end_of_buf) {
4631                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4632                                  end_of_buf);
4633                         break;
4634                 }
4635
4636                 *lastentry = entryptr;
4637                 entrycount++;
4638
4639                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4640                 if (!next_offset)
4641                         break;
4642         }
4643
4644         return entrycount;
4645 }
4646
4647 /*
4648  * Readdir/FindFirst
4649  */
4650 int SMB2_query_directory_init(const unsigned int xid,
4651                               struct cifs_tcon *tcon,
4652                               struct TCP_Server_Info *server,
4653                               struct smb_rqst *rqst,
4654                               u64 persistent_fid, u64 volatile_fid,
4655                               int index, int info_level)
4656 {
4657         struct smb2_query_directory_req *req;
4658         unsigned char *bufptr;
4659         __le16 asteriks = cpu_to_le16('*');
4660         unsigned int output_size = CIFSMaxBufSize -
4661                 MAX_SMB2_CREATE_RESPONSE_SIZE -
4662                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
4663         unsigned int total_len;
4664         struct kvec *iov = rqst->rq_iov;
4665         int len, rc;
4666
4667         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
4668                                  (void **) &req, &total_len);
4669         if (rc)
4670                 return rc;
4671
4672         switch (info_level) {
4673         case SMB_FIND_FILE_DIRECTORY_INFO:
4674                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4675                 break;
4676         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4677                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4678                 break;
4679         case SMB_FIND_FILE_POSIX_INFO:
4680                 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
4681                 break;
4682         default:
4683                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4684                         info_level);
4685                 return -EINVAL;
4686         }
4687
4688         req->FileIndex = cpu_to_le32(index);
4689         req->PersistentFileId = persistent_fid;
4690         req->VolatileFileId = volatile_fid;
4691
4692         len = 0x2;
4693         bufptr = req->Buffer;
4694         memcpy(bufptr, &asteriks, len);
4695
4696         req->FileNameOffset =
4697                 cpu_to_le16(sizeof(struct smb2_query_directory_req));
4698         req->FileNameLength = cpu_to_le16(len);
4699         /*
4700          * BB could be 30 bytes or so longer if we used SMB2 specific
4701          * buffer lengths, but this is safe and close enough.
4702          */
4703         output_size = min_t(unsigned int, output_size, server->maxBuf);
4704         output_size = min_t(unsigned int, output_size, 2 << 15);
4705         req->OutputBufferLength = cpu_to_le32(output_size);
4706
4707         iov[0].iov_base = (char *)req;
4708         /* 1 for Buffer */
4709         iov[0].iov_len = total_len - 1;
4710
4711         iov[1].iov_base = (char *)(req->Buffer);
4712         iov[1].iov_len = len;
4713
4714         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4715                         tcon->ses->Suid, index, output_size);
4716
4717         return 0;
4718 }
4719
4720 void SMB2_query_directory_free(struct smb_rqst *rqst)
4721 {
4722         if (rqst && rqst->rq_iov) {
4723                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4724         }
4725 }
4726
4727 int
4728 smb2_parse_query_directory(struct cifs_tcon *tcon,
4729                            struct kvec *rsp_iov,
4730                            int resp_buftype,
4731                            struct cifs_search_info *srch_inf)
4732 {
4733         struct smb2_query_directory_rsp *rsp;
4734         size_t info_buf_size;
4735         char *end_of_smb;
4736         int rc;
4737
4738         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4739
4740         switch (srch_inf->info_level) {
4741         case SMB_FIND_FILE_DIRECTORY_INFO:
4742                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4743                 break;
4744         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4745                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4746                 break;
4747         case SMB_FIND_FILE_POSIX_INFO:
4748                 /* note that posix payload are variable size */
4749                 info_buf_size = sizeof(struct smb2_posix_info);
4750                 break;
4751         default:
4752                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4753                          srch_inf->info_level);
4754                 return -EINVAL;
4755         }
4756
4757         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4758                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4759                                info_buf_size);
4760         if (rc) {
4761                 cifs_tcon_dbg(VFS, "bad info payload");
4762                 return rc;
4763         }
4764
4765         srch_inf->unicode = true;
4766
4767         if (srch_inf->ntwrk_buf_start) {
4768                 if (srch_inf->smallBuf)
4769                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4770                 else
4771                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4772         }
4773         srch_inf->ntwrk_buf_start = (char *)rsp;
4774         srch_inf->srch_entries_start = srch_inf->last_entry =
4775                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4776         end_of_smb = rsp_iov->iov_len + (char *)rsp;
4777
4778         srch_inf->entries_in_buffer = num_entries(
4779                 srch_inf->info_level,
4780                 srch_inf->srch_entries_start,
4781                 end_of_smb,
4782                 &srch_inf->last_entry,
4783                 info_buf_size);
4784
4785         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4786         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4787                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4788                  srch_inf->srch_entries_start, srch_inf->last_entry);
4789         if (resp_buftype == CIFS_LARGE_BUFFER)
4790                 srch_inf->smallBuf = false;
4791         else if (resp_buftype == CIFS_SMALL_BUFFER)
4792                 srch_inf->smallBuf = true;
4793         else
4794                 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
4795
4796         return 0;
4797 }
4798
4799 int
4800 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4801                      u64 persistent_fid, u64 volatile_fid, int index,
4802                      struct cifs_search_info *srch_inf)
4803 {
4804         struct smb_rqst rqst;
4805         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
4806         struct smb2_query_directory_rsp *rsp = NULL;
4807         int resp_buftype = CIFS_NO_BUFFER;
4808         struct kvec rsp_iov;
4809         int rc = 0;
4810         struct cifs_ses *ses = tcon->ses;
4811         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4812         int flags = 0;
4813
4814         if (!ses || !(ses->server))
4815                 return -EIO;
4816
4817         if (smb3_encryption_required(tcon))
4818                 flags |= CIFS_TRANSFORM_REQ;
4819
4820         memset(&rqst, 0, sizeof(struct smb_rqst));
4821         memset(&iov, 0, sizeof(iov));
4822         rqst.rq_iov = iov;
4823         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
4824
4825         rc = SMB2_query_directory_init(xid, tcon, server,
4826                                        &rqst, persistent_fid,
4827                                        volatile_fid, index,
4828                                        srch_inf->info_level);
4829         if (rc)
4830                 goto qdir_exit;
4831
4832         rc = cifs_send_recv(xid, ses, server,
4833                             &rqst, &resp_buftype, flags, &rsp_iov);
4834         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4835
4836         if (rc) {
4837                 if (rc == -ENODATA &&
4838                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4839                         trace_smb3_query_dir_done(xid, persistent_fid,
4840                                 tcon->tid, tcon->ses->Suid, index, 0);
4841                         srch_inf->endOfSearch = true;
4842                         rc = 0;
4843                 } else {
4844                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4845                                 tcon->ses->Suid, index, 0, rc);
4846                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4847                 }
4848                 goto qdir_exit;
4849         }
4850
4851         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
4852                                         srch_inf);
4853         if (rc) {
4854                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4855                         tcon->ses->Suid, index, 0, rc);
4856                 goto qdir_exit;
4857         }
4858         resp_buftype = CIFS_NO_BUFFER;
4859
4860         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4861                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4862
4863 qdir_exit:
4864         SMB2_query_directory_free(&rqst);
4865         free_rsp_buf(resp_buftype, rsp);
4866         return rc;
4867 }
4868
4869 int
4870 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4871                    struct smb_rqst *rqst,
4872                    u64 persistent_fid, u64 volatile_fid, u32 pid,
4873                    u8 info_class, u8 info_type, u32 additional_info,
4874                    void **data, unsigned int *size)
4875 {
4876         struct smb2_set_info_req *req;
4877         struct kvec *iov = rqst->rq_iov;
4878         unsigned int i, total_len;
4879         int rc;
4880
4881         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
4882                                  (void **) &req, &total_len);
4883         if (rc)
4884                 return rc;
4885
4886         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4887         req->InfoType = info_type;
4888         req->FileInfoClass = info_class;
4889         req->PersistentFileId = persistent_fid;
4890         req->VolatileFileId = volatile_fid;
4891         req->AdditionalInformation = cpu_to_le32(additional_info);
4892
4893         req->BufferOffset =
4894                         cpu_to_le16(sizeof(struct smb2_set_info_req));
4895         req->BufferLength = cpu_to_le32(*size);
4896
4897         memcpy(req->Buffer, *data, *size);
4898         total_len += *size;
4899
4900         iov[0].iov_base = (char *)req;
4901         /* 1 for Buffer */
4902         iov[0].iov_len = total_len - 1;
4903
4904         for (i = 1; i < rqst->rq_nvec; i++) {
4905                 le32_add_cpu(&req->BufferLength, size[i]);
4906                 iov[i].iov_base = (char *)data[i];
4907                 iov[i].iov_len = size[i];
4908         }
4909
4910         return 0;
4911 }
4912
4913 void
4914 SMB2_set_info_free(struct smb_rqst *rqst)
4915 {
4916         if (rqst && rqst->rq_iov)
4917                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4918 }
4919
4920 static int
4921 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4922                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4923                u8 info_type, u32 additional_info, unsigned int num,
4924                 void **data, unsigned int *size)
4925 {
4926         struct smb_rqst rqst;
4927         struct smb2_set_info_rsp *rsp = NULL;
4928         struct kvec *iov;
4929         struct kvec rsp_iov;
4930         int rc = 0;
4931         int resp_buftype;
4932         struct cifs_ses *ses = tcon->ses;
4933         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4934         int flags = 0;
4935
4936         if (!ses || !server)
4937                 return -EIO;
4938
4939         if (!num)
4940                 return -EINVAL;
4941
4942         if (smb3_encryption_required(tcon))
4943                 flags |= CIFS_TRANSFORM_REQ;
4944
4945         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4946         if (!iov)
4947                 return -ENOMEM;
4948
4949         memset(&rqst, 0, sizeof(struct smb_rqst));
4950         rqst.rq_iov = iov;
4951         rqst.rq_nvec = num;
4952
4953         rc = SMB2_set_info_init(tcon, server,
4954                                 &rqst, persistent_fid, volatile_fid, pid,
4955                                 info_class, info_type, additional_info,
4956                                 data, size);
4957         if (rc) {
4958                 kfree(iov);
4959                 return rc;
4960         }
4961
4962
4963         rc = cifs_send_recv(xid, ses, server,
4964                             &rqst, &resp_buftype, flags,
4965                             &rsp_iov);
4966         SMB2_set_info_free(&rqst);
4967         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4968
4969         if (rc != 0) {
4970                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4971                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4972                                 ses->Suid, info_class, (__u32)info_type, rc);
4973         }
4974
4975         free_rsp_buf(resp_buftype, rsp);
4976         kfree(iov);
4977         return rc;
4978 }
4979
4980 int
4981 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4982              u64 volatile_fid, u32 pid, __le64 *eof)
4983 {
4984         struct smb2_file_eof_info info;
4985         void *data;
4986         unsigned int size;
4987
4988         info.EndOfFile = *eof;
4989
4990         data = &info;
4991         size = sizeof(struct smb2_file_eof_info);
4992
4993         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4994                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4995                         0, 1, &data, &size);
4996 }
4997
4998 int
4999 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
5000                 u64 persistent_fid, u64 volatile_fid,
5001                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
5002 {
5003         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5004                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
5005                         1, (void **)&pnntsd, &pacllen);
5006 }
5007
5008 int
5009 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
5010             u64 persistent_fid, u64 volatile_fid,
5011             struct smb2_file_full_ea_info *buf, int len)
5012 {
5013         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5014                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
5015                 0, 1, (void **)&buf, &len);
5016 }
5017
5018 int
5019 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
5020                   const u64 persistent_fid, const u64 volatile_fid,
5021                   __u8 oplock_level)
5022 {
5023         struct smb_rqst rqst;
5024         int rc;
5025         struct smb2_oplock_break *req = NULL;
5026         struct cifs_ses *ses = tcon->ses;
5027         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5028         int flags = CIFS_OBREAK_OP;
5029         unsigned int total_len;
5030         struct kvec iov[1];
5031         struct kvec rsp_iov;
5032         int resp_buf_type;
5033
5034         cifs_dbg(FYI, "SMB2_oplock_break\n");
5035         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5036                                  (void **) &req, &total_len);
5037         if (rc)
5038                 return rc;
5039
5040         if (smb3_encryption_required(tcon))
5041                 flags |= CIFS_TRANSFORM_REQ;
5042
5043         req->VolatileFid = volatile_fid;
5044         req->PersistentFid = persistent_fid;
5045         req->OplockLevel = oplock_level;
5046         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5047
5048         flags |= CIFS_NO_RSP_BUF;
5049
5050         iov[0].iov_base = (char *)req;
5051         iov[0].iov_len = total_len;
5052
5053         memset(&rqst, 0, sizeof(struct smb_rqst));
5054         rqst.rq_iov = iov;
5055         rqst.rq_nvec = 1;
5056
5057         rc = cifs_send_recv(xid, ses, server,
5058                             &rqst, &resp_buf_type, flags, &rsp_iov);
5059         cifs_small_buf_release(req);
5060
5061         if (rc) {
5062                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5063                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5064         }
5065
5066         return rc;
5067 }
5068
5069 void
5070 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5071                              struct kstatfs *kst)
5072 {
5073         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5074                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5075         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5076         kst->f_bfree  = kst->f_bavail =
5077                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5078         return;
5079 }
5080
5081 static void
5082 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5083                         struct kstatfs *kst)
5084 {
5085         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5086         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5087         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5088         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5089                 kst->f_bavail = kst->f_bfree;
5090         else
5091                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5092         if (response_data->TotalFileNodes != cpu_to_le64(-1))
5093                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5094         if (response_data->FreeFileNodes != cpu_to_le64(-1))
5095                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5096
5097         return;
5098 }
5099
5100 static int
5101 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5102                    struct TCP_Server_Info *server,
5103                    int level, int outbuf_len, u64 persistent_fid,
5104                    u64 volatile_fid)
5105 {
5106         int rc;
5107         struct smb2_query_info_req *req;
5108         unsigned int total_len;
5109
5110         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5111
5112         if ((tcon->ses == NULL) || server == NULL)
5113                 return -EIO;
5114
5115         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5116                                  (void **) &req, &total_len);
5117         if (rc)
5118                 return rc;
5119
5120         req->InfoType = SMB2_O_INFO_FILESYSTEM;
5121         req->FileInfoClass = level;
5122         req->PersistentFileId = persistent_fid;
5123         req->VolatileFileId = volatile_fid;
5124         /* 1 for pad */
5125         req->InputBufferOffset =
5126                         cpu_to_le16(sizeof(struct smb2_query_info_req));
5127         req->OutputBufferLength = cpu_to_le32(
5128                 outbuf_len + sizeof(struct smb2_query_info_rsp));
5129
5130         iov->iov_base = (char *)req;
5131         iov->iov_len = total_len;
5132         return 0;
5133 }
5134
5135 static inline void free_qfs_info_req(struct kvec *iov)
5136 {
5137         cifs_buf_release(iov->iov_base);
5138 }
5139
5140 int
5141 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5142               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5143 {
5144         struct smb_rqst rqst;
5145         struct smb2_query_info_rsp *rsp = NULL;
5146         struct kvec iov;
5147         struct kvec rsp_iov;
5148         int rc = 0;
5149         int resp_buftype;
5150         struct cifs_ses *ses = tcon->ses;
5151         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5152         FILE_SYSTEM_POSIX_INFO *info = NULL;
5153         int flags = 0;
5154
5155         rc = build_qfs_info_req(&iov, tcon, server,
5156                                 FS_POSIX_INFORMATION,
5157                                 sizeof(FILE_SYSTEM_POSIX_INFO),
5158                                 persistent_fid, volatile_fid);
5159         if (rc)
5160                 return rc;
5161
5162         if (smb3_encryption_required(tcon))
5163                 flags |= CIFS_TRANSFORM_REQ;
5164
5165         memset(&rqst, 0, sizeof(struct smb_rqst));
5166         rqst.rq_iov = &iov;
5167         rqst.rq_nvec = 1;
5168
5169         rc = cifs_send_recv(xid, ses, server,
5170                             &rqst, &resp_buftype, flags, &rsp_iov);
5171         free_qfs_info_req(&iov);
5172         if (rc) {
5173                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5174                 goto posix_qfsinf_exit;
5175         }
5176         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5177
5178         info = (FILE_SYSTEM_POSIX_INFO *)(
5179                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5180         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5181                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5182                                sizeof(FILE_SYSTEM_POSIX_INFO));
5183         if (!rc)
5184                 copy_posix_fs_info_to_kstatfs(info, fsdata);
5185
5186 posix_qfsinf_exit:
5187         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5188         return rc;
5189 }
5190
5191 int
5192 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5193               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5194 {
5195         struct smb_rqst rqst;
5196         struct smb2_query_info_rsp *rsp = NULL;
5197         struct kvec iov;
5198         struct kvec rsp_iov;
5199         int rc = 0;
5200         int resp_buftype;
5201         struct cifs_ses *ses = tcon->ses;
5202         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5203         struct smb2_fs_full_size_info *info = NULL;
5204         int flags = 0;
5205
5206         rc = build_qfs_info_req(&iov, tcon, server,
5207                                 FS_FULL_SIZE_INFORMATION,
5208                                 sizeof(struct smb2_fs_full_size_info),
5209                                 persistent_fid, volatile_fid);
5210         if (rc)
5211                 return rc;
5212
5213         if (smb3_encryption_required(tcon))
5214                 flags |= CIFS_TRANSFORM_REQ;
5215
5216         memset(&rqst, 0, sizeof(struct smb_rqst));
5217         rqst.rq_iov = &iov;
5218         rqst.rq_nvec = 1;
5219
5220         rc = cifs_send_recv(xid, ses, server,
5221                             &rqst, &resp_buftype, flags, &rsp_iov);
5222         free_qfs_info_req(&iov);
5223         if (rc) {
5224                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5225                 goto qfsinf_exit;
5226         }
5227         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5228
5229         info = (struct smb2_fs_full_size_info *)(
5230                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5231         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5232                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5233                                sizeof(struct smb2_fs_full_size_info));
5234         if (!rc)
5235                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5236
5237 qfsinf_exit:
5238         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5239         return rc;
5240 }
5241
5242 int
5243 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5244               u64 persistent_fid, u64 volatile_fid, int level)
5245 {
5246         struct smb_rqst rqst;
5247         struct smb2_query_info_rsp *rsp = NULL;
5248         struct kvec iov;
5249         struct kvec rsp_iov;
5250         int rc = 0;
5251         int resp_buftype, max_len, min_len;
5252         struct cifs_ses *ses = tcon->ses;
5253         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5254         unsigned int rsp_len, offset;
5255         int flags = 0;
5256
5257         if (level == FS_DEVICE_INFORMATION) {
5258                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5259                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5260         } else if (level == FS_ATTRIBUTE_INFORMATION) {
5261                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5262                 min_len = MIN_FS_ATTR_INFO_SIZE;
5263         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5264                 max_len = sizeof(struct smb3_fs_ss_info);
5265                 min_len = sizeof(struct smb3_fs_ss_info);
5266         } else if (level == FS_VOLUME_INFORMATION) {
5267                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5268                 min_len = sizeof(struct smb3_fs_vol_info);
5269         } else {
5270                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5271                 return -EINVAL;
5272         }
5273
5274         rc = build_qfs_info_req(&iov, tcon, server,
5275                                 level, max_len,
5276                                 persistent_fid, volatile_fid);
5277         if (rc)
5278                 return rc;
5279
5280         if (smb3_encryption_required(tcon))
5281                 flags |= CIFS_TRANSFORM_REQ;
5282
5283         memset(&rqst, 0, sizeof(struct smb_rqst));
5284         rqst.rq_iov = &iov;
5285         rqst.rq_nvec = 1;
5286
5287         rc = cifs_send_recv(xid, ses, server,
5288                             &rqst, &resp_buftype, flags, &rsp_iov);
5289         free_qfs_info_req(&iov);
5290         if (rc) {
5291                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5292                 goto qfsattr_exit;
5293         }
5294         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5295
5296         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5297         offset = le16_to_cpu(rsp->OutputBufferOffset);
5298         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5299         if (rc)
5300                 goto qfsattr_exit;
5301
5302         if (level == FS_ATTRIBUTE_INFORMATION)
5303                 memcpy(&tcon->fsAttrInfo, offset
5304                         + (char *)rsp, min_t(unsigned int,
5305                         rsp_len, max_len));
5306         else if (level == FS_DEVICE_INFORMATION)
5307                 memcpy(&tcon->fsDevInfo, offset
5308                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5309         else if (level == FS_SECTOR_SIZE_INFORMATION) {
5310                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5311                         (offset + (char *)rsp);
5312                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5313                 tcon->perf_sector_size =
5314                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5315         } else if (level == FS_VOLUME_INFORMATION) {
5316                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5317                         (offset + (char *)rsp);
5318                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5319                 tcon->vol_create_time = vol_info->VolumeCreationTime;
5320         }
5321
5322 qfsattr_exit:
5323         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5324         return rc;
5325 }
5326
5327 int
5328 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5329            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5330            const __u32 num_lock, struct smb2_lock_element *buf)
5331 {
5332         struct smb_rqst rqst;
5333         int rc = 0;
5334         struct smb2_lock_req *req = NULL;
5335         struct kvec iov[2];
5336         struct kvec rsp_iov;
5337         int resp_buf_type;
5338         unsigned int count;
5339         int flags = CIFS_NO_RSP_BUF;
5340         unsigned int total_len;
5341         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5342
5343         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
5344
5345         rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
5346                                  (void **) &req, &total_len);
5347         if (rc)
5348                 return rc;
5349
5350         if (smb3_encryption_required(tcon))
5351                 flags |= CIFS_TRANSFORM_REQ;
5352
5353         req->sync_hdr.ProcessId = cpu_to_le32(pid);
5354         req->LockCount = cpu_to_le16(num_lock);
5355
5356         req->PersistentFileId = persist_fid;
5357         req->VolatileFileId = volatile_fid;
5358
5359         count = num_lock * sizeof(struct smb2_lock_element);
5360
5361         iov[0].iov_base = (char *)req;
5362         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
5363         iov[1].iov_base = (char *)buf;
5364         iov[1].iov_len = count;
5365
5366         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
5367
5368         memset(&rqst, 0, sizeof(struct smb_rqst));
5369         rqst.rq_iov = iov;
5370         rqst.rq_nvec = 2;
5371
5372         rc = cifs_send_recv(xid, tcon->ses, server,
5373                             &rqst, &resp_buf_type, flags,
5374                             &rsp_iov);
5375         cifs_small_buf_release(req);
5376         if (rc) {
5377                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
5378                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
5379                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
5380                                     tcon->ses->Suid, rc);
5381         }
5382
5383         return rc;
5384 }
5385
5386 int
5387 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5388           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5389           const __u64 length, const __u64 offset, const __u32 lock_flags,
5390           const bool wait)
5391 {
5392         struct smb2_lock_element lock;
5393
5394         lock.Offset = cpu_to_le64(offset);
5395         lock.Length = cpu_to_le64(length);
5396         lock.Flags = cpu_to_le32(lock_flags);
5397         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5398                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5399
5400         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5401 }
5402
5403 int
5404 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5405                  __u8 *lease_key, const __le32 lease_state)
5406 {
5407         struct smb_rqst rqst;
5408         int rc;
5409         struct smb2_lease_ack *req = NULL;
5410         struct cifs_ses *ses = tcon->ses;
5411         int flags = CIFS_OBREAK_OP;
5412         unsigned int total_len;
5413         struct kvec iov[1];
5414         struct kvec rsp_iov;
5415         int resp_buf_type;
5416         __u64 *please_key_high;
5417         __u64 *please_key_low;
5418         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5419
5420         cifs_dbg(FYI, "SMB2_lease_break\n");
5421         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5422                                  (void **) &req, &total_len);
5423         if (rc)
5424                 return rc;
5425
5426         if (smb3_encryption_required(tcon))
5427                 flags |= CIFS_TRANSFORM_REQ;
5428
5429         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5430         req->StructureSize = cpu_to_le16(36);
5431         total_len += 12;
5432
5433         memcpy(req->LeaseKey, lease_key, 16);
5434         req->LeaseState = lease_state;
5435
5436         flags |= CIFS_NO_RSP_BUF;
5437
5438         iov[0].iov_base = (char *)req;
5439         iov[0].iov_len = total_len;
5440
5441         memset(&rqst, 0, sizeof(struct smb_rqst));
5442         rqst.rq_iov = iov;
5443         rqst.rq_nvec = 1;
5444
5445         rc = cifs_send_recv(xid, ses, server,
5446                             &rqst, &resp_buf_type, flags, &rsp_iov);
5447         cifs_small_buf_release(req);
5448
5449         please_key_low = (__u64 *)lease_key;
5450         please_key_high = (__u64 *)(lease_key+8);
5451         if (rc) {
5452                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5453                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5454                         ses->Suid, *please_key_low, *please_key_high, rc);
5455                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5456         } else
5457                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5458                         ses->Suid, *please_key_low, *please_key_high);
5459
5460         return rc;
5461 }