fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/uuid.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/xattr.h>
  39 #include "smb2pdu.h"
  40 #include "cifsglob.h"
  41 #include "cifsacl.h"
  42 #include "cifsproto.h"
  43 #include "smb2proto.h"
  44 #include "cifs_unicode.h"
  45 #include "cifs_debug.h"
  46 #include "ntlmssp.h"
  47 #include "smb2status.h"
  48 #include "smb2glob.h"
  49 #include "cifspdu.h"
  50 #include "cifs_spnego.h"
  51 #include "smbdirect.h"
  52 #include "trace.h"
  53 #ifdef CONFIG_CIFS_DFS_UPCALL
  54 #include "dfs_cache.h"
  55 #endif
  56
  57 /*
  58  *  The following table defines the expected "StructureSize" of SMB2 requests
  59  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  60  *
  61  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  62  *  indexed by command in host byte order.
  63  */
  64 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  65         /* SMB2_NEGOTIATE */ 36,
  66         /* SMB2_SESSION_SETUP */ 25,
  67         /* SMB2_LOGOFF */ 4,
  68         /* SMB2_TREE_CONNECT */ 9,
  69         /* SMB2_TREE_DISCONNECT */ 4,
  70         /* SMB2_CREATE */ 57,
  71         /* SMB2_CLOSE */ 24,
  72         /* SMB2_FLUSH */ 24,
  73         /* SMB2_READ */ 49,
  74         /* SMB2_WRITE */ 49,
  75         /* SMB2_LOCK */ 48,
  76         /* SMB2_IOCTL */ 57,
  77         /* SMB2_CANCEL */ 4,
  78         /* SMB2_ECHO */ 4,
  79         /* SMB2_QUERY_DIRECTORY */ 33,
  80         /* SMB2_CHANGE_NOTIFY */ 32,
  81         /* SMB2_QUERY_INFO */ 41,
  82         /* SMB2_SET_INFO */ 33,
  83         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  84 };
  85
  86 int smb3_encryption_required(const struct cifs_tcon *tcon)
  87 {
  88         if (!tcon || !tcon->ses)
  89                 return 0;
  90         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  91             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  92                 return 1;
  93         if (tcon->seal &&
  94             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  95                 return 1;
  96         return 0;
  97 }
  98
  99 static void
 100 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
 101                   const struct cifs_tcon *tcon,
 102                   struct TCP_Server_Info *server)
 103 {
 104         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 105         shdr->StructureSize = cpu_to_le16(64);
 106         shdr->Command = smb2_cmd;
 107         if (server) {
 108                 spin_lock(&server->req_lock);
 109                 /* Request up to 10 credits but don't go over the limit. */
 110                 if (server->credits >= server->max_credits)
 111                         shdr->CreditRequest = cpu_to_le16(0);
 112                 else
 113                         shdr->CreditRequest = cpu_to_le16(
 114                                 min_t(int, server->max_credits -
 115                                                 server->credits, 10));
 116                 spin_unlock(&server->req_lock);
 117         } else {
 118                 shdr->CreditRequest = cpu_to_le16(2);
 119         }
 120         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 121
 122         if (!tcon)
 123                 goto out;
 124
 125         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 126         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 127         if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 128                 shdr->CreditCharge = cpu_to_le16(1);
 129         /* else CreditCharge MBZ */
 130
 131         shdr->TreeId = tcon->tid;
 132         /* Uid is not converted */
 133         if (tcon->ses)
 134                 shdr->SessionId = tcon->ses->Suid;
 135
 136         /*
 137          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 138          * to pass the path on the Open SMB prefixed by \\server\share.
 139          * Not sure when we would need to do the augmented path (if ever) and
 140          * setting this flag breaks the SMB2 open operation since it is
 141          * illegal to send an empty path name (without \\server\share prefix)
 142          * when the DFS flag is set in the SMB open header. We could
 143          * consider setting the flag on all operations other than open
 144          * but it is safer to net set it for now.
 145          */
 146 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 147                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 148
 149         if (server && server->sign && !smb3_encryption_required(tcon))
 150                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 151 out:
 152         return;
 153 }
 154
 155 static int
 156 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
 157                struct TCP_Server_Info *server)
 158 {
 159         int rc;
 160         struct nls_table *nls_codepage;
 161         struct cifs_ses *ses;
 162         int retries;
 163
 164         /*
 165          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 166          * check for tcp and smb session status done differently
 167          * for those three - in the calling routine.
 168          */
 169         if (tcon == NULL)
 170                 return 0;
 171
 172         if (smb2_command == SMB2_TREE_CONNECT)
 173                 return 0;
 174
 175         if (tcon->tidStatus == CifsExiting) {
 176                 /*
 177                  * only tree disconnect, open, and write,
 178                  * (and ulogoff which does not have tcon)
 179                  * are allowed as we start force umount.
 180                  */
 181                 if ((smb2_command != SMB2_WRITE) &&
 182                    (smb2_command != SMB2_CREATE) &&
 183                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 184                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 185                                  smb2_command);
 186                         return -ENODEV;
 187                 }
 188         }
 189         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 190             (!tcon->ses->server) || !server)
 191                 return -EIO;
 192
 193         ses = tcon->ses;
 194         retries = server->nr_targets;
 195
 196         /*
 197          * Give demultiplex thread up to 10 seconds to each target available for
 198          * reconnect -- should be greater than cifs socket timeout which is 7
 199          * seconds.
 200          */
 201         while (server->tcpStatus == CifsNeedReconnect) {
 202                 /*
 203                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 204                  * here since they are implicitly done when session drops.
 205                  */
 206                 switch (smb2_command) {
 207                 /*
 208                  * BB Should we keep oplock break and add flush to exceptions?
 209                  */
 210                 case SMB2_TREE_DISCONNECT:
 211                 case SMB2_CANCEL:
 212                 case SMB2_CLOSE:
 213                 case SMB2_OPLOCK_BREAK:
 214                         return -EAGAIN;
 215                 }
 216
 217                 rc = wait_event_interruptible_timeout(server->response_q,
 218                                                       (server->tcpStatus != CifsNeedReconnect),
 219                                                       10 * HZ);
 220                 if (rc < 0) {
 221                         cifs_dbg(FYI, "%s: aborting reconnect due to a received signal by the process\n",
 222                                  __func__);
 223                         return -ERESTARTSYS;
 224                 }
 225
 226                 /* are we still trying to reconnect? */
 227                 if (server->tcpStatus != CifsNeedReconnect)
 228                         break;
 229
 230                 if (retries && --retries)
 231                         continue;
 232
 233                 /*
 234                  * on "soft" mounts we wait once. Hard mounts keep
 235                  * retrying until process is killed or server comes
 236                  * back on-line
 237                  */
 238                 if (!tcon->retry) {
 239                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 240                         return -EHOSTDOWN;
 241                 }
 242                 retries = server->nr_targets;
 243         }
 244
 245         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 246                 return 0;
 247
 248         nls_codepage = load_nls_default();
 249
 250         /*
 251          * need to prevent multiple threads trying to simultaneously reconnect
 252          * the same SMB session
 253          */
 254         mutex_lock(&tcon->ses->session_mutex);
 255
 256         /*
 257          * Recheck after acquire mutex. If another thread is negotiating
 258          * and the server never sends an answer the socket will be closed
 259          * and tcpStatus set to reconnect.
 260          */
 261         if (server->tcpStatus == CifsNeedReconnect) {
 262                 rc = -EHOSTDOWN;
 263                 mutex_unlock(&tcon->ses->session_mutex);
 264                 goto out;
 265         }
 266
 267         /*
 268          * If we are reconnecting an extra channel, bind
 269          */
 270         if (server->is_channel) {
 271                 ses->binding = true;
 272                 ses->binding_chan = cifs_ses_find_chan(ses, server);
 273         }
 274
 275         rc = cifs_negotiate_protocol(0, tcon->ses);
 276         if (!rc && tcon->ses->need_reconnect) {
 277                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 278                 if ((rc == -EACCES) && !tcon->retry) {
 279                         rc = -EHOSTDOWN;
 280                         ses->binding = false;
 281                         ses->binding_chan = NULL;
 282                         mutex_unlock(&tcon->ses->session_mutex);
 283                         goto failed;
 284                 }
 285         }
 286         /*
 287          * End of channel binding
 288          */
 289         ses->binding = false;
 290         ses->binding_chan = NULL;
 291
 292         if (rc || !tcon->need_reconnect) {
 293                 mutex_unlock(&tcon->ses->session_mutex);
 294                 goto out;
 295         }
 296
 297         cifs_mark_open_files_invalid(tcon);
 298         if (tcon->use_persistent)
 299                 tcon->need_reopen_files = true;
 300
 301         rc = cifs_tree_connect(0, tcon, nls_codepage);
 302         mutex_unlock(&tcon->ses->session_mutex);
 303
 304         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 305         if (rc) {
 306                 /* If sess reconnected but tcon didn't, something strange ... */
 307                 pr_warn_once("reconnect tcon failed rc = %d\n", rc);
 308                 goto out;
 309         }
 310
 311         if (smb2_command != SMB2_INTERNAL_CMD)
 312                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
 313
 314         atomic_inc(&tconInfoReconnectCount);
 315 out:
 316         /*
 317          * Check if handle based operation so we know whether we can continue
 318          * or not without returning to caller to reset file handle.
 319          */
 320         /*
 321          * BB Is flush done by server on drop of tcp session? Should we special
 322          * case it and skip above?
 323          */
 324         switch (smb2_command) {
 325         case SMB2_FLUSH:
 326         case SMB2_READ:
 327         case SMB2_WRITE:
 328         case SMB2_LOCK:
 329         case SMB2_IOCTL:
 330         case SMB2_QUERY_DIRECTORY:
 331         case SMB2_CHANGE_NOTIFY:
 332         case SMB2_QUERY_INFO:
 333         case SMB2_SET_INFO:
 334                 rc = -EAGAIN;
 335         }
 336 failed:
 337         unload_nls(nls_codepage);
 338         return rc;
 339 }
 340
 341 static void
 342 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
 343                struct TCP_Server_Info *server,
 344                void *buf,
 345                unsigned int *total_len)
 346 {
 347         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 348         /* lookup word count ie StructureSize from table */
 349         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 350
 351         /*
 352          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 353          * largest operations (Create)
 354          */
 355         memset(buf, 0, 256);
 356
 357         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon, server);
 358         spdu->StructureSize2 = cpu_to_le16(parmsize);
 359
 360         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 361 }
 362
 363 /*
 364  * Allocate and return pointer to an SMB request hdr, and set basic
 365  * SMB information in the SMB header. If the return code is zero, this
 366  * function must have filled in request_buf pointer.
 367  */
 368 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 369                                  struct TCP_Server_Info *server,
 370                                  void **request_buf, unsigned int *total_len)
 371 {
 372         /* BB eventually switch this to SMB2 specific small buf size */
 373         if (smb2_command == SMB2_SET_INFO)
 374                 *request_buf = cifs_buf_get();
 375         else
 376                 *request_buf = cifs_small_buf_get();
 377         if (*request_buf == NULL) {
 378                 /* BB should we add a retry in here if not a writepage? */
 379                 return -ENOMEM;
 380         }
 381
 382         fill_small_buf(smb2_command, tcon, server,
 383                        (struct smb2_sync_hdr *)(*request_buf),
 384                        total_len);
 385
 386         if (tcon != NULL) {
 387                 uint16_t com_code = le16_to_cpu(smb2_command);
 388                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 389                 cifs_stats_inc(&tcon->num_smbs_sent);
 390         }
 391
 392         return 0;
 393 }
 394
 395 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 396                                struct TCP_Server_Info *server,
 397                                void **request_buf, unsigned int *total_len)
 398 {
 399         int rc;
 400
 401         rc = smb2_reconnect(smb2_command, tcon, server);
 402         if (rc)
 403                 return rc;
 404
 405         return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
 406                                      total_len);
 407 }
 408
 409 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 410                                struct TCP_Server_Info *server,
 411                                void **request_buf, unsigned int *total_len)
 412 {
 413         /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
 414         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
 415                 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 416                                              request_buf, total_len);
 417         }
 418         return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 419                                    request_buf, total_len);
 420 }
 421
 422 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 423
 424 static void
 425 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 426 {
 427         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 428         pneg_ctxt->DataLength = cpu_to_le16(38);
 429         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 430         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_LINUX_CLIENT_SALT_SIZE);
 431         get_random_bytes(pneg_ctxt->Salt, SMB311_LINUX_CLIENT_SALT_SIZE);
 432         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 433 }
 434
 435 static void
 436 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 437 {
 438         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 439         pneg_ctxt->DataLength =
 440                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 441                           - sizeof(struct smb2_neg_context));
 442         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 443         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 444         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 445         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 446 }
 447
 448 static void
 449 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 450 {
 451         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 452         if (require_gcm_256) {
 453                 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
 454                 pneg_ctxt->CipherCount = cpu_to_le16(1);
 455                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
 456         } else if (enable_gcm_256) {
 457                 pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
 458                 pneg_ctxt->CipherCount = cpu_to_le16(3);
 459                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 460                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
 461                 pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
 462         } else {
 463                 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
 464                 pneg_ctxt->CipherCount = cpu_to_le16(2);
 465                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 466                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 467         }
 468 }
 469
 470 static unsigned int
 471 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 472 {
 473         struct nls_table *cp = load_nls_default();
 474
 475         pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 476
 477         /* copy up to max of first 100 bytes of server name to NetName field */
 478         pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 479         /* context size is DataLength + minimal smb2_neg_context */
 480         return DIV_ROUND_UP(le16_to_cpu(pneg_ctxt->DataLength) +
 481                         sizeof(struct smb2_neg_context), 8) * 8;
 482 }
 483
 484 static void
 485 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 486 {
 487         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 488         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 489         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 490         pneg_ctxt->Name[0] = 0x93;
 491         pneg_ctxt->Name[1] = 0xAD;
 492         pneg_ctxt->Name[2] = 0x25;
 493         pneg_ctxt->Name[3] = 0x50;
 494         pneg_ctxt->Name[4] = 0x9C;
 495         pneg_ctxt->Name[5] = 0xB4;
 496         pneg_ctxt->Name[6] = 0x11;
 497         pneg_ctxt->Name[7] = 0xE7;
 498         pneg_ctxt->Name[8] = 0xB4;
 499         pneg_ctxt->Name[9] = 0x23;
 500         pneg_ctxt->Name[10] = 0x83;
 501         pneg_ctxt->Name[11] = 0xDE;
 502         pneg_ctxt->Name[12] = 0x96;
 503         pneg_ctxt->Name[13] = 0x8B;
 504         pneg_ctxt->Name[14] = 0xCD;
 505         pneg_ctxt->Name[15] = 0x7C;
 506 }
 507
 508 static void
 509 assemble_neg_contexts(struct smb2_negotiate_req *req,
 510                       struct TCP_Server_Info *server, unsigned int *total_len)
 511 {
 512         char *pneg_ctxt;
 513         unsigned int ctxt_len;
 514
 515         if (*total_len > 200) {
 516                 /* In case length corrupted don't want to overrun smb buffer */
 517                 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 518                 return;
 519         }
 520
 521         /*
 522          * round up total_len of fixed part of SMB3 negotiate request to 8
 523          * byte boundary before adding negotiate contexts
 524          */
 525         *total_len = roundup(*total_len, 8);
 526
 527         pneg_ctxt = (*total_len) + (char *)req;
 528         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 529
 530         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 531         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 532         *total_len += ctxt_len;
 533         pneg_ctxt += ctxt_len;
 534
 535         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 536         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 537         *total_len += ctxt_len;
 538         pneg_ctxt += ctxt_len;
 539
 540         if (server->compress_algorithm) {
 541                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 542                                 pneg_ctxt);
 543                 ctxt_len = DIV_ROUND_UP(
 544                         sizeof(struct smb2_compression_capabilities_context),
 545                                 8) * 8;
 546                 *total_len += ctxt_len;
 547                 pneg_ctxt += ctxt_len;
 548                 req->NegotiateContextCount = cpu_to_le16(5);
 549         } else
 550                 req->NegotiateContextCount = cpu_to_le16(4);
 551
 552         ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 553                                         server->hostname);
 554         *total_len += ctxt_len;
 555         pneg_ctxt += ctxt_len;
 556
 557         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 558         *total_len += sizeof(struct smb2_posix_neg_context);
 559 }
 560
 561 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 562 {
 563         unsigned int len = le16_to_cpu(ctxt->DataLength);
 564
 565         /* If invalid preauth context warn but use what we requested, SHA-512 */
 566         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 567                 pr_warn_once("server sent bad preauth context\n");
 568                 return;
 569         } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
 570                 pr_warn_once("server sent invalid SaltLength\n");
 571                 return;
 572         }
 573         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 574                 pr_warn_once("Invalid SMB3 hash algorithm count\n");
 575         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 576                 pr_warn_once("unknown SMB3 hash algorithm\n");
 577 }
 578
 579 static void decode_compress_ctx(struct TCP_Server_Info *server,
 580                          struct smb2_compression_capabilities_context *ctxt)
 581 {
 582         unsigned int len = le16_to_cpu(ctxt->DataLength);
 583
 584         /* sizeof compress context is a one element compression capbility struct */
 585         if (len < 10) {
 586                 pr_warn_once("server sent bad compression cntxt\n");
 587                 return;
 588         }
 589         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 590                 pr_warn_once("Invalid SMB3 compress algorithm count\n");
 591                 return;
 592         }
 593         if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 594                 pr_warn_once("unknown compression algorithm\n");
 595                 return;
 596         }
 597         server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 598 }
 599
 600 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 601                               struct smb2_encryption_neg_context *ctxt)
 602 {
 603         unsigned int len = le16_to_cpu(ctxt->DataLength);
 604
 605         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 606         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 607                 pr_warn_once("server sent bad crypto ctxt len\n");
 608                 return -EINVAL;
 609         }
 610
 611         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 612                 pr_warn_once("Invalid SMB3.11 cipher count\n");
 613                 return -EINVAL;
 614         }
 615         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 616         if (require_gcm_256) {
 617                 if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
 618                         cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
 619                         return -EOPNOTSUPP;
 620                 }
 621         } else if (ctxt->Ciphers[0] == 0) {
 622                 /*
 623                  * e.g. if server only supported AES256_CCM (very unlikely)
 624                  * or server supported no encryption types or had all disabled.
 625                  * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
 626                  * in which mount requested encryption ("seal") checks later
 627                  * on during tree connection will return proper rc, but if
 628                  * seal not requested by client, since server is allowed to
 629                  * return 0 to indicate no supported cipher, we can't fail here
 630                  */
 631                 server->cipher_type = 0;
 632                 server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
 633                 pr_warn_once("Server does not support requested encryption types\n");
 634                 return 0;
 635         } else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 636                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
 637                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
 638                 /* server returned a cipher we didn't ask for */
 639                 pr_warn_once("Invalid SMB3.11 cipher returned\n");
 640                 return -EINVAL;
 641         }
 642         server->cipher_type = ctxt->Ciphers[0];
 643         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 644         return 0;
 645 }
 646
 647 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 648                                      struct TCP_Server_Info *server,
 649                                      unsigned int len_of_smb)
 650 {
 651         struct smb2_neg_context *pctx;
 652         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 653         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 654         unsigned int len_of_ctxts, i;
 655         int rc = 0;
 656
 657         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 658         if (len_of_smb <= offset) {
 659                 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 660                 return -EINVAL;
 661         }
 662
 663         len_of_ctxts = len_of_smb - offset;
 664
 665         for (i = 0; i < ctxt_cnt; i++) {
 666                 int clen;
 667                 /* check that offset is not beyond end of SMB */
 668                 if (len_of_ctxts == 0)
 669                         break;
 670
 671                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 672                         break;
 673
 674                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 675                 clen = le16_to_cpu(pctx->DataLength);
 676                 if (clen > len_of_ctxts)
 677                         break;
 678
 679                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 680                         decode_preauth_context(
 681                                 (struct smb2_preauth_neg_context *)pctx);
 682                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 683                         rc = decode_encrypt_ctx(server,
 684                                 (struct smb2_encryption_neg_context *)pctx);
 685                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 686                         decode_compress_ctx(server,
 687                                 (struct smb2_compression_capabilities_context *)pctx);
 688                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 689                         server->posix_ext_supported = true;
 690                 else
 691                         cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 692                                 le16_to_cpu(pctx->ContextType));
 693
 694                 if (rc)
 695                         break;
 696                 /* offsets must be 8 byte aligned */
 697                 clen = (clen + 7) & ~0x7;
 698                 offset += clen + sizeof(struct smb2_neg_context);
 699                 len_of_ctxts -= clen;
 700         }
 701         return rc;
 702 }
 703
 704 static struct create_posix *
 705 create_posix_buf(umode_t mode)
 706 {
 707         struct create_posix *buf;
 708
 709         buf = kzalloc(sizeof(struct create_posix),
 710                         GFP_KERNEL);
 711         if (!buf)
 712                 return NULL;
 713
 714         buf->ccontext.DataOffset =
 715                 cpu_to_le16(offsetof(struct create_posix, Mode));
 716         buf->ccontext.DataLength = cpu_to_le32(4);
 717         buf->ccontext.NameOffset =
 718                 cpu_to_le16(offsetof(struct create_posix, Name));
 719         buf->ccontext.NameLength = cpu_to_le16(16);
 720
 721         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 722         buf->Name[0] = 0x93;
 723         buf->Name[1] = 0xAD;
 724         buf->Name[2] = 0x25;
 725         buf->Name[3] = 0x50;
 726         buf->Name[4] = 0x9C;
 727         buf->Name[5] = 0xB4;
 728         buf->Name[6] = 0x11;
 729         buf->Name[7] = 0xE7;
 730         buf->Name[8] = 0xB4;
 731         buf->Name[9] = 0x23;
 732         buf->Name[10] = 0x83;
 733         buf->Name[11] = 0xDE;
 734         buf->Name[12] = 0x96;
 735         buf->Name[13] = 0x8B;
 736         buf->Name[14] = 0xCD;
 737         buf->Name[15] = 0x7C;
 738         buf->Mode = cpu_to_le32(mode);
 739         cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
 740         return buf;
 741 }
 742
 743 static int
 744 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 745 {
 746         struct smb2_create_req *req = iov[0].iov_base;
 747         unsigned int num = *num_iovec;
 748
 749         iov[num].iov_base = create_posix_buf(mode);
 750         if (mode == ACL_NO_MODE)
 751                 cifs_dbg(FYI, "Invalid mode\n");
 752         if (iov[num].iov_base == NULL)
 753                 return -ENOMEM;
 754         iov[num].iov_len = sizeof(struct create_posix);
 755         if (!req->CreateContextsOffset)
 756                 req->CreateContextsOffset = cpu_to_le32(
 757                                 sizeof(struct smb2_create_req) +
 758                                 iov[num - 1].iov_len);
 759         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 760         *num_iovec = num + 1;
 761         return 0;
 762 }
 763
 764
 765 /*
 766  *
 767  *      SMB2 Worker functions follow:
 768  *
 769  *      The general structure of the worker functions is:
 770  *      1) Call smb2_init (assembles SMB2 header)
 771  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 772  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 773  *      4) Decode SMB2 command specific fields in the fixed length area
 774  *      5) Decode variable length data area (if any for this SMB2 command type)
 775  *      6) Call free smb buffer
 776  *      7) return
 777  *
 778  */
 779
 780 int
 781 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 782 {
 783         struct smb_rqst rqst;
 784         struct smb2_negotiate_req *req;
 785         struct smb2_negotiate_rsp *rsp;
 786         struct kvec iov[1];
 787         struct kvec rsp_iov;
 788         int rc = 0;
 789         int resp_buftype;
 790         struct TCP_Server_Info *server = cifs_ses_server(ses);
 791         int blob_offset, blob_length;
 792         char *security_blob;
 793         int flags = CIFS_NEG_OP;
 794         unsigned int total_len;
 795
 796         cifs_dbg(FYI, "Negotiate protocol\n");
 797
 798         if (!server) {
 799                 WARN(1, "%s: server is NULL!\n", __func__);
 800                 return -EIO;
 801         }
 802
 803         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
 804                                  (void **) &req, &total_len);
 805         if (rc)
 806                 return rc;
 807
 808         req->sync_hdr.SessionId = 0;
 809
 810         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 811         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 812
 813         if (strcmp(server->vals->version_string,
 814                    SMB3ANY_VERSION_STRING) == 0) {
 815                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 816                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 817                 req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
 818                 req->DialectCount = cpu_to_le16(3);
 819                 total_len += 6;
 820         } else if (strcmp(server->vals->version_string,
 821                    SMBDEFAULT_VERSION_STRING) == 0) {
 822                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 823                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 824                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 825                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 826                 req->DialectCount = cpu_to_le16(4);
 827                 total_len += 8;
 828         } else {
 829                 /* otherwise send specific dialect */
 830                 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
 831                 req->DialectCount = cpu_to_le16(1);
 832                 total_len += 2;
 833         }
 834
 835         /* only one of SMB2 signing flags may be set in SMB2 request */
 836         if (ses->sign)
 837                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 838         else if (global_secflags & CIFSSEC_MAY_SIGN)
 839                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 840         else
 841                 req->SecurityMode = 0;
 842
 843         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
 844         if (ses->chan_max > 1)
 845                 req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
 846
 847         /* ClientGUID must be zero for SMB2.02 dialect */
 848         if (server->vals->protocol_id == SMB20_PROT_ID)
 849                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 850         else {
 851                 memcpy(req->ClientGUID, server->client_guid,
 852                         SMB2_CLIENT_GUID_SIZE);
 853                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
 854                     (strcmp(server->vals->version_string,
 855                      SMB3ANY_VERSION_STRING) == 0) ||
 856                     (strcmp(server->vals->version_string,
 857                      SMBDEFAULT_VERSION_STRING) == 0))
 858                         assemble_neg_contexts(req, server, &total_len);
 859         }
 860         iov[0].iov_base = (char *)req;
 861         iov[0].iov_len = total_len;
 862
 863         memset(&rqst, 0, sizeof(struct smb_rqst));
 864         rqst.rq_iov = iov;
 865         rqst.rq_nvec = 1;
 866
 867         rc = cifs_send_recv(xid, ses, server,
 868                             &rqst, &resp_buftype, flags, &rsp_iov);
 869         cifs_small_buf_release(req);
 870         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 871         /*
 872          * No tcon so can't do
 873          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 874          */
 875         if (rc == -EOPNOTSUPP) {
 876                 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");
 877                 goto neg_exit;
 878         } else if (rc != 0)
 879                 goto neg_exit;
 880
 881         if (strcmp(server->vals->version_string,
 882                    SMB3ANY_VERSION_STRING) == 0) {
 883                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 884                         cifs_server_dbg(VFS,
 885                                 "SMB2 dialect returned but not requested\n");
 886                         return -EIO;
 887                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 888                         cifs_server_dbg(VFS,
 889                                 "SMB2.1 dialect returned but not requested\n");
 890                         return -EIO;
 891                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 892                         /* ops set to 3.0 by default for default so update */
 893                         server->ops = &smb311_operations;
 894                         server->vals = &smb311_values;
 895                 }
 896         } else if (strcmp(server->vals->version_string,
 897                    SMBDEFAULT_VERSION_STRING) == 0) {
 898                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 899                         cifs_server_dbg(VFS,
 900                                 "SMB2 dialect returned but not requested\n");
 901                         return -EIO;
 902                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 903                         /* ops set to 3.0 by default for default so update */
 904                         server->ops = &smb21_operations;
 905                         server->vals = &smb21_values;
 906                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 907                         server->ops = &smb311_operations;
 908                         server->vals = &smb311_values;
 909                 }
 910         } else if (le16_to_cpu(rsp->DialectRevision) !=
 911                                 server->vals->protocol_id) {
 912                 /* if requested single dialect ensure returned dialect matched */
 913                 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
 914                                 le16_to_cpu(rsp->DialectRevision));
 915                 return -EIO;
 916         }
 917
 918         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 919
 920         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 921                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 922         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 923                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 924         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 925                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 926         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 927                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 928         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 929                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 930         else {
 931                 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
 932                                 le16_to_cpu(rsp->DialectRevision));
 933                 rc = -EIO;
 934                 goto neg_exit;
 935         }
 936         server->dialect = le16_to_cpu(rsp->DialectRevision);
 937
 938         /*
 939          * Keep a copy of the hash after negprot. This hash will be
 940          * the starting hash value for all sessions made from this
 941          * server.
 942          */
 943         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 944                SMB2_PREAUTH_HASH_SIZE);
 945
 946         /* SMB2 only has an extended negflavor */
 947         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 948         /* set it to the maximum buffer size value we can send with 1 credit */
 949         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 950                                SMB2_MAX_BUFFER_SIZE);
 951         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 952         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 953         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 954         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 955                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 956                                 server->sec_mode);
 957         server->capabilities = le32_to_cpu(rsp->Capabilities);
 958         /* Internal types */
 959         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 960
 961         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 962                                                (struct smb2_sync_hdr *)rsp);
 963         /*
 964          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 965          * for us will be
 966          *      ses->sectype = RawNTLMSSP;
 967          * but for time being this is our only auth choice so doesn't matter.
 968          * We just found a server which sets blob length to zero expecting raw.
 969          */
 970         if (blob_length == 0) {
 971                 cifs_dbg(FYI, "missing security blob on negprot\n");
 972                 server->sec_ntlmssp = true;
 973         }
 974
 975         rc = cifs_enable_signing(server, ses->sign);
 976         if (rc)
 977                 goto neg_exit;
 978         if (blob_length) {
 979                 rc = decode_negTokenInit(security_blob, blob_length, server);
 980                 if (rc == 1)
 981                         rc = 0;
 982                 else if (rc == 0)
 983                         rc = -EIO;
 984         }
 985
 986         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 987                 if (rsp->NegotiateContextCount)
 988                         rc = smb311_decode_neg_context(rsp, server,
 989                                                        rsp_iov.iov_len);
 990                 else
 991                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
 992         }
 993 neg_exit:
 994         free_rsp_buf(resp_buftype, rsp);
 995         return rc;
 996 }
 997
 998 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 999 {
1000         int rc;
1001         struct validate_negotiate_info_req *pneg_inbuf;
1002         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1003         u32 rsplen;
1004         u32 inbuflen; /* max of 4 dialects */
1005         struct TCP_Server_Info *server = tcon->ses->server;
1006
1007         cifs_dbg(FYI, "validate negotiate\n");
1008
1009         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1010         if (server->dialect == SMB311_PROT_ID)
1011                 return 0;
1012
1013         /*
1014          * validation ioctl must be signed, so no point sending this if we
1015          * can not sign it (ie are not known user).  Even if signing is not
1016          * required (enabled but not negotiated), in those cases we selectively
1017          * sign just this, the first and only signed request on a connection.
1018          * Having validation of negotiate info  helps reduce attack vectors.
1019          */
1020         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1021                 return 0; /* validation requires signing */
1022
1023         if (tcon->ses->user_name == NULL) {
1024                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1025                 return 0; /* validation requires signing */
1026         }
1027
1028         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1029                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1030
1031         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1032         if (!pneg_inbuf)
1033                 return -ENOMEM;
1034
1035         pneg_inbuf->Capabilities =
1036                         cpu_to_le32(server->vals->req_capabilities);
1037         if (tcon->ses->chan_max > 1)
1038                 pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1039
1040         memcpy(pneg_inbuf->Guid, server->client_guid,
1041                                         SMB2_CLIENT_GUID_SIZE);
1042
1043         if (tcon->ses->sign)
1044                 pneg_inbuf->SecurityMode =
1045                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1046         else if (global_secflags & CIFSSEC_MAY_SIGN)
1047                 pneg_inbuf->SecurityMode =
1048                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1049         else
1050                 pneg_inbuf->SecurityMode = 0;
1051
1052
1053         if (strcmp(server->vals->version_string,
1054                 SMB3ANY_VERSION_STRING) == 0) {
1055                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1056                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1057                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1058                 pneg_inbuf->DialectCount = cpu_to_le16(3);
1059                 /* SMB 2.1 not included so subtract one dialect from len */
1060                 inbuflen = sizeof(*pneg_inbuf) -
1061                                 (sizeof(pneg_inbuf->Dialects[0]));
1062         } else if (strcmp(server->vals->version_string,
1063                 SMBDEFAULT_VERSION_STRING) == 0) {
1064                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1065                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1066                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1067                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1068                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1069                 /* structure is big enough for 4 dialects */
1070                 inbuflen = sizeof(*pneg_inbuf);
1071         } else {
1072                 /* otherwise specific dialect was requested */
1073                 pneg_inbuf->Dialects[0] =
1074                         cpu_to_le16(server->vals->protocol_id);
1075                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1076                 /* structure is big enough for 3 dialects, sending only 1 */
1077                 inbuflen = sizeof(*pneg_inbuf) -
1078                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
1079         }
1080
1081         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1082                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
1083                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1084                 (char **)&pneg_rsp, &rsplen);
1085         if (rc == -EOPNOTSUPP) {
1086                 /*
1087                  * Old Windows versions or Netapp SMB server can return
1088                  * not supported error. Client should accept it.
1089                  */
1090                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1091                 rc = 0;
1092                 goto out_free_inbuf;
1093         } else if (rc != 0) {
1094                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1095                               rc);
1096                 rc = -EIO;
1097                 goto out_free_inbuf;
1098         }
1099
1100         rc = -EIO;
1101         if (rsplen != sizeof(*pneg_rsp)) {
1102                 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1103                               rsplen);
1104
1105                 /* relax check since Mac returns max bufsize allowed on ioctl */
1106                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1107                         goto out_free_rsp;
1108         }
1109
1110         /* check validate negotiate info response matches what we got earlier */
1111         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1112                 goto vneg_out;
1113
1114         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1115                 goto vneg_out;
1116
1117         /* do not validate server guid because not saved at negprot time yet */
1118
1119         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1120               SMB2_LARGE_FILES) != server->capabilities)
1121                 goto vneg_out;
1122
1123         /* validate negotiate successful */
1124         rc = 0;
1125         cifs_dbg(FYI, "validate negotiate info successful\n");
1126         goto out_free_rsp;
1127
1128 vneg_out:
1129         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1130 out_free_rsp:
1131         kfree(pneg_rsp);
1132 out_free_inbuf:
1133         kfree(pneg_inbuf);
1134         return rc;
1135 }
1136
1137 enum securityEnum
1138 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1139 {
1140         switch (requested) {
1141         case Kerberos:
1142         case RawNTLMSSP:
1143                 return requested;
1144         case NTLMv2:
1145                 return RawNTLMSSP;
1146         case Unspecified:
1147                 if (server->sec_ntlmssp &&
1148                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1149                         return RawNTLMSSP;
1150                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1151                         (global_secflags & CIFSSEC_MAY_KRB5))
1152                         return Kerberos;
1153                 fallthrough;
1154         default:
1155                 return Unspecified;
1156         }
1157 }
1158
1159 struct SMB2_sess_data {
1160         unsigned int xid;
1161         struct cifs_ses *ses;
1162         struct nls_table *nls_cp;
1163         void (*func)(struct SMB2_sess_data *);
1164         int result;
1165         u64 previous_session;
1166
1167         /* we will send the SMB in three pieces:
1168          * a fixed length beginning part, an optional
1169          * SPNEGO blob (which can be zero length), and a
1170          * last part which will include the strings
1171          * and rest of bcc area. This allows us to avoid
1172          * a large buffer 17K allocation
1173          */
1174         int buf0_type;
1175         struct kvec iov[2];
1176 };
1177
1178 static int
1179 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1180 {
1181         int rc;
1182         struct cifs_ses *ses = sess_data->ses;
1183         struct smb2_sess_setup_req *req;
1184         struct TCP_Server_Info *server = cifs_ses_server(ses);
1185         unsigned int total_len;
1186
1187         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1188                                  (void **) &req,
1189                                  &total_len);
1190         if (rc)
1191                 return rc;
1192
1193         if (sess_data->ses->binding) {
1194                 req->sync_hdr.SessionId = sess_data->ses->Suid;
1195                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1196                 req->PreviousSessionId = 0;
1197                 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1198         } else {
1199                 /* First session, not a reauthenticate */
1200                 req->sync_hdr.SessionId = 0;
1201                 /*
1202                  * if reconnect, we need to send previous sess id
1203                  * otherwise it is 0
1204                  */
1205                 req->PreviousSessionId = sess_data->previous_session;
1206                 req->Flags = 0; /* MBZ */
1207         }
1208
1209         /* enough to enable echos and oplocks and one max size write */
1210         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1211
1212         /* only one of SMB2 signing flags may be set in SMB2 request */
1213         if (server->sign)
1214                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1215         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1216                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1217         else
1218                 req->SecurityMode = 0;
1219
1220 #ifdef CONFIG_CIFS_DFS_UPCALL
1221         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1222 #else
1223         req->Capabilities = 0;
1224 #endif /* DFS_UPCALL */
1225
1226         req->Channel = 0; /* MBZ */
1227
1228         sess_data->iov[0].iov_base = (char *)req;
1229         /* 1 for pad */
1230         sess_data->iov[0].iov_len = total_len - 1;
1231         /*
1232          * This variable will be used to clear the buffer
1233          * allocated above in case of any error in the calling function.
1234          */
1235         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1236
1237         return 0;
1238 }
1239
1240 static void
1241 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1242 {
1243         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1244         sess_data->buf0_type = CIFS_NO_BUFFER;
1245 }
1246
1247 static int
1248 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1249 {
1250         int rc;
1251         struct smb_rqst rqst;
1252         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1253         struct kvec rsp_iov = { NULL, 0 };
1254
1255         /* Testing shows that buffer offset must be at location of Buffer[0] */
1256         req->SecurityBufferOffset =
1257                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1258         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1259
1260         memset(&rqst, 0, sizeof(struct smb_rqst));
1261         rqst.rq_iov = sess_data->iov;
1262         rqst.rq_nvec = 2;
1263
1264         /* BB add code to build os and lm fields */
1265         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1266                             cifs_ses_server(sess_data->ses),
1267                             &rqst,
1268                             &sess_data->buf0_type,
1269                             CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);
1270         cifs_small_buf_release(sess_data->iov[0].iov_base);
1271         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1272
1273         return rc;
1274 }
1275
1276 static int
1277 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1278 {
1279         int rc = 0;
1280         struct cifs_ses *ses = sess_data->ses;
1281         struct TCP_Server_Info *server = cifs_ses_server(ses);
1282
1283         mutex_lock(&server->srv_mutex);
1284         if (server->ops->generate_signingkey) {
1285                 rc = server->ops->generate_signingkey(ses);
1286                 if (rc) {
1287                         cifs_dbg(FYI,
1288                                 "SMB3 session key generation failed\n");
1289                         mutex_unlock(&server->srv_mutex);
1290                         return rc;
1291                 }
1292         }
1293         if (!server->session_estab) {
1294                 server->sequence_number = 0x2;
1295                 server->session_estab = true;
1296         }
1297         mutex_unlock(&server->srv_mutex);
1298
1299         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1300         /* keep existing ses state if binding */
1301         if (!ses->binding) {
1302                 spin_lock(&GlobalMid_Lock);
1303                 ses->status = CifsGood;
1304                 ses->need_reconnect = false;
1305                 spin_unlock(&GlobalMid_Lock);
1306         }
1307
1308         return rc;
1309 }
1310
1311 #ifdef CONFIG_CIFS_UPCALL
1312 static void
1313 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1314 {
1315         int rc;
1316         struct cifs_ses *ses = sess_data->ses;
1317         struct cifs_spnego_msg *msg;
1318         struct key *spnego_key = NULL;
1319         struct smb2_sess_setup_rsp *rsp = NULL;
1320
1321         rc = SMB2_sess_alloc_buffer(sess_data);
1322         if (rc)
1323                 goto out;
1324
1325         spnego_key = cifs_get_spnego_key(ses);
1326         if (IS_ERR(spnego_key)) {
1327                 rc = PTR_ERR(spnego_key);
1328                 if (rc == -ENOKEY)
1329                         cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1330                 spnego_key = NULL;
1331                 goto out;
1332         }
1333
1334         msg = spnego_key->payload.data[0];
1335         /*
1336          * check version field to make sure that cifs.upcall is
1337          * sending us a response in an expected form
1338          */
1339         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1340                 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1341                          CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1342                 rc = -EKEYREJECTED;
1343                 goto out_put_spnego_key;
1344         }
1345
1346         /* keep session key if binding */
1347         if (!ses->binding) {
1348                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1349                                                  GFP_KERNEL);
1350                 if (!ses->auth_key.response) {
1351                         cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1352                                  msg->sesskey_len);
1353                         rc = -ENOMEM;
1354                         goto out_put_spnego_key;
1355                 }
1356                 ses->auth_key.len = msg->sesskey_len;
1357         }
1358
1359         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1360         sess_data->iov[1].iov_len = msg->secblob_len;
1361
1362         rc = SMB2_sess_sendreceive(sess_data);
1363         if (rc)
1364                 goto out_put_spnego_key;
1365
1366         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1367         /* keep session id and flags if binding */
1368         if (!ses->binding) {
1369                 ses->Suid = rsp->sync_hdr.SessionId;
1370                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1371         }
1372
1373         rc = SMB2_sess_establish_session(sess_data);
1374 out_put_spnego_key:
1375         key_invalidate(spnego_key);
1376         key_put(spnego_key);
1377 out:
1378         sess_data->result = rc;
1379         sess_data->func = NULL;
1380         SMB2_sess_free_buffer(sess_data);
1381 }
1382 #else
1383 static void
1384 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1385 {
1386         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1387         sess_data->result = -EOPNOTSUPP;
1388         sess_data->func = NULL;
1389 }
1390 #endif
1391
1392 static void
1393 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1394
1395 static void
1396 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1397 {
1398         int rc;
1399         struct cifs_ses *ses = sess_data->ses;
1400         struct smb2_sess_setup_rsp *rsp = NULL;
1401         char *ntlmssp_blob = NULL;
1402         bool use_spnego = false; /* else use raw ntlmssp */
1403         u16 blob_length = 0;
1404
1405         /*
1406          * If memory allocation is successful, caller of this function
1407          * frees it.
1408          */
1409         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1410         if (!ses->ntlmssp) {
1411                 rc = -ENOMEM;
1412                 goto out_err;
1413         }
1414         ses->ntlmssp->sesskey_per_smbsess = true;
1415
1416         rc = SMB2_sess_alloc_buffer(sess_data);
1417         if (rc)
1418                 goto out_err;
1419
1420         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1421                                GFP_KERNEL);
1422         if (ntlmssp_blob == NULL) {
1423                 rc = -ENOMEM;
1424                 goto out;
1425         }
1426
1427         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1428         if (use_spnego) {
1429                 /* BB eventually need to add this */
1430                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1431                 rc = -EOPNOTSUPP;
1432                 goto out;
1433         } else {
1434                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1435                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1436         }
1437         sess_data->iov[1].iov_base = ntlmssp_blob;
1438         sess_data->iov[1].iov_len = blob_length;
1439
1440         rc = SMB2_sess_sendreceive(sess_data);
1441         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1442
1443         /* If true, rc here is expected and not an error */
1444         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1445                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1446                 rc = 0;
1447
1448         if (rc)
1449                 goto out;
1450
1451         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1452                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1453                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1454                         le16_to_cpu(rsp->SecurityBufferOffset));
1455                 rc = -EIO;
1456                 goto out;
1457         }
1458         rc = decode_ntlmssp_challenge(rsp->Buffer,
1459                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1460         if (rc)
1461                 goto out;
1462
1463         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1464
1465         /* keep existing ses id and flags if binding */
1466         if (!ses->binding) {
1467                 ses->Suid = rsp->sync_hdr.SessionId;
1468                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1469         }
1470
1471 out:
1472         kfree(ntlmssp_blob);
1473         SMB2_sess_free_buffer(sess_data);
1474         if (!rc) {
1475                 sess_data->result = 0;
1476                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1477                 return;
1478         }
1479 out_err:
1480         kfree(ses->ntlmssp);
1481         ses->ntlmssp = NULL;
1482         sess_data->result = rc;
1483         sess_data->func = NULL;
1484 }
1485
1486 static void
1487 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1488 {
1489         int rc;
1490         struct cifs_ses *ses = sess_data->ses;
1491         struct smb2_sess_setup_req *req;
1492         struct smb2_sess_setup_rsp *rsp = NULL;
1493         unsigned char *ntlmssp_blob = NULL;
1494         bool use_spnego = false; /* else use raw ntlmssp */
1495         u16 blob_length = 0;
1496
1497         rc = SMB2_sess_alloc_buffer(sess_data);
1498         if (rc)
1499                 goto out;
1500
1501         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1502         req->sync_hdr.SessionId = ses->Suid;
1503
1504         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1505                                         sess_data->nls_cp);
1506         if (rc) {
1507                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1508                 goto out;
1509         }
1510
1511         if (use_spnego) {
1512                 /* BB eventually need to add this */
1513                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1514                 rc = -EOPNOTSUPP;
1515                 goto out;
1516         }
1517         sess_data->iov[1].iov_base = ntlmssp_blob;
1518         sess_data->iov[1].iov_len = blob_length;
1519
1520         rc = SMB2_sess_sendreceive(sess_data);
1521         if (rc)
1522                 goto out;
1523
1524         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1525
1526         /* keep existing ses id and flags if binding */
1527         if (!ses->binding) {
1528                 ses->Suid = rsp->sync_hdr.SessionId;
1529                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1530         }
1531
1532         rc = SMB2_sess_establish_session(sess_data);
1533 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1534         if (ses->server->dialect < SMB30_PROT_ID) {
1535                 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1536                 /*
1537                  * The session id is opaque in terms of endianness, so we can't
1538                  * print it as a long long. we dump it as we got it on the wire
1539                  */
1540                 cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1541                          &ses->Suid);
1542                 cifs_dbg(VFS, "Session Key   %*ph\n",
1543                          SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1544                 cifs_dbg(VFS, "Signing Key   %*ph\n",
1545                          SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1546         }
1547 #endif
1548 out:
1549         kfree(ntlmssp_blob);
1550         SMB2_sess_free_buffer(sess_data);
1551         kfree(ses->ntlmssp);
1552         ses->ntlmssp = NULL;
1553         sess_data->result = rc;
1554         sess_data->func = NULL;
1555 }
1556
1557 static int
1558 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1559 {
1560         int type;
1561
1562         type = smb2_select_sectype(cifs_ses_server(ses), ses->sectype);
1563         cifs_dbg(FYI, "sess setup type %d\n", type);
1564         if (type == Unspecified) {
1565                 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1566                 return -EINVAL;
1567         }
1568
1569         switch (type) {
1570         case Kerberos:
1571                 sess_data->func = SMB2_auth_kerberos;
1572                 break;
1573         case RawNTLMSSP:
1574                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1575                 break;
1576         default:
1577                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1578                 return -EOPNOTSUPP;
1579         }
1580
1581         return 0;
1582 }
1583
1584 int
1585 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1586                 const struct nls_table *nls_cp)
1587 {
1588         int rc = 0;
1589         struct TCP_Server_Info *server = cifs_ses_server(ses);
1590         struct SMB2_sess_data *sess_data;
1591
1592         cifs_dbg(FYI, "Session Setup\n");
1593
1594         if (!server) {
1595                 WARN(1, "%s: server is NULL!\n", __func__);
1596                 return -EIO;
1597         }
1598
1599         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1600         if (!sess_data)
1601                 return -ENOMEM;
1602
1603         rc = SMB2_select_sec(ses, sess_data);
1604         if (rc)
1605                 goto out;
1606         sess_data->xid = xid;
1607         sess_data->ses = ses;
1608         sess_data->buf0_type = CIFS_NO_BUFFER;
1609         sess_data->nls_cp = (struct nls_table *) nls_cp;
1610         sess_data->previous_session = ses->Suid;
1611
1612         /*
1613          * Initialize the session hash with the server one.
1614          */
1615         memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1616                SMB2_PREAUTH_HASH_SIZE);
1617
1618         while (sess_data->func)
1619                 sess_data->func(sess_data);
1620
1621         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1622                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1623         rc = sess_data->result;
1624 out:
1625         kfree(sess_data);
1626         return rc;
1627 }
1628
1629 int
1630 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1631 {
1632         struct smb_rqst rqst;
1633         struct smb2_logoff_req *req; /* response is also trivial struct */
1634         int rc = 0;
1635         struct TCP_Server_Info *server;
1636         int flags = 0;
1637         unsigned int total_len;
1638         struct kvec iov[1];
1639         struct kvec rsp_iov;
1640         int resp_buf_type;
1641
1642         cifs_dbg(FYI, "disconnect session %p\n", ses);
1643
1644         if (ses && (ses->server))
1645                 server = ses->server;
1646         else
1647                 return -EIO;
1648
1649         /* no need to send SMB logoff if uid already closed due to reconnect */
1650         if (ses->need_reconnect)
1651                 goto smb2_session_already_dead;
1652
1653         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1654                                  (void **) &req, &total_len);
1655         if (rc)
1656                 return rc;
1657
1658          /* since no tcon, smb2_init can not do this, so do here */
1659         req->sync_hdr.SessionId = ses->Suid;
1660
1661         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1662                 flags |= CIFS_TRANSFORM_REQ;
1663         else if (server->sign)
1664                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1665
1666         flags |= CIFS_NO_RSP_BUF;
1667
1668         iov[0].iov_base = (char *)req;
1669         iov[0].iov_len = total_len;
1670
1671         memset(&rqst, 0, sizeof(struct smb_rqst));
1672         rqst.rq_iov = iov;
1673         rqst.rq_nvec = 1;
1674
1675         rc = cifs_send_recv(xid, ses, ses->server,
1676                             &rqst, &resp_buf_type, flags, &rsp_iov);
1677         cifs_small_buf_release(req);
1678         /*
1679          * No tcon so can't do
1680          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1681          */
1682
1683 smb2_session_already_dead:
1684         return rc;
1685 }
1686
1687 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1688 {
1689         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1690 }
1691
1692 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1693
1694 /* These are similar values to what Windows uses */
1695 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1696 {
1697         tcon->max_chunks = 256;
1698         tcon->max_bytes_chunk = 1048576;
1699         tcon->max_bytes_copy = 16777216;
1700 }
1701
1702 int
1703 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1704           struct cifs_tcon *tcon, const struct nls_table *cp)
1705 {
1706         struct smb_rqst rqst;
1707         struct smb2_tree_connect_req *req;
1708         struct smb2_tree_connect_rsp *rsp = NULL;
1709         struct kvec iov[2];
1710         struct kvec rsp_iov = { NULL, 0 };
1711         int rc = 0;
1712         int resp_buftype;
1713         int unc_path_len;
1714         __le16 *unc_path = NULL;
1715         int flags = 0;
1716         unsigned int total_len;
1717         struct TCP_Server_Info *server;
1718
1719         /* always use master channel */
1720         server = ses->server;
1721
1722         cifs_dbg(FYI, "TCON\n");
1723
1724         if (!server || !tree)
1725                 return -EIO;
1726
1727         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1728         if (unc_path == NULL)
1729                 return -ENOMEM;
1730
1731         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1732         unc_path_len *= 2;
1733         if (unc_path_len < 2) {
1734                 kfree(unc_path);
1735                 return -EINVAL;
1736         }
1737
1738         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1739         tcon->tid = 0;
1740         atomic_set(&tcon->num_remote_opens, 0);
1741         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
1742                                  (void **) &req, &total_len);
1743         if (rc) {
1744                 kfree(unc_path);
1745                 return rc;
1746         }
1747
1748         if (smb3_encryption_required(tcon))
1749                 flags |= CIFS_TRANSFORM_REQ;
1750
1751         iov[0].iov_base = (char *)req;
1752         /* 1 for pad */
1753         iov[0].iov_len = total_len - 1;
1754
1755         /* Testing shows that buffer offset must be at location of Buffer[0] */
1756         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1757                         - 1 /* pad */);
1758         req->PathLength = cpu_to_le16(unc_path_len - 2);
1759         iov[1].iov_base = unc_path;
1760         iov[1].iov_len = unc_path_len;
1761
1762         /*
1763          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1764          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1765          * (Samba servers don't always set the flag so also check if null user)
1766          */
1767         if ((server->dialect == SMB311_PROT_ID) &&
1768             !smb3_encryption_required(tcon) &&
1769             !(ses->session_flags &
1770                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1771             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1772                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1773
1774         memset(&rqst, 0, sizeof(struct smb_rqst));
1775         rqst.rq_iov = iov;
1776         rqst.rq_nvec = 2;
1777
1778         /* Need 64 for max size write so ask for more in case not there yet */
1779         req->sync_hdr.CreditRequest = cpu_to_le16(64);
1780
1781         rc = cifs_send_recv(xid, ses, server,
1782                             &rqst, &resp_buftype, flags, &rsp_iov);
1783         cifs_small_buf_release(req);
1784         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1785         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1786         if (rc != 0) {
1787                 if (tcon) {
1788                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1789                         tcon->need_reconnect = true;
1790                 }
1791                 goto tcon_error_exit;
1792         }
1793
1794         switch (rsp->ShareType) {
1795         case SMB2_SHARE_TYPE_DISK:
1796                 cifs_dbg(FYI, "connection to disk share\n");
1797                 break;
1798         case SMB2_SHARE_TYPE_PIPE:
1799                 tcon->pipe = true;
1800                 cifs_dbg(FYI, "connection to pipe share\n");
1801                 break;
1802         case SMB2_SHARE_TYPE_PRINT:
1803                 tcon->print = true;
1804                 cifs_dbg(FYI, "connection to printer\n");
1805                 break;
1806         default:
1807                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1808                 rc = -EOPNOTSUPP;
1809                 goto tcon_error_exit;
1810         }
1811
1812         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1813         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1814         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1815         tcon->tidStatus = CifsGood;
1816         tcon->need_reconnect = false;
1817         tcon->tid = rsp->sync_hdr.TreeId;
1818         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1819
1820         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1821             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1822                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1823
1824         if (tcon->seal &&
1825             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1826                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1827
1828         init_copy_chunk_defaults(tcon);
1829         if (server->ops->validate_negotiate)
1830                 rc = server->ops->validate_negotiate(xid, tcon);
1831 tcon_exit:
1832
1833         free_rsp_buf(resp_buftype, rsp);
1834         kfree(unc_path);
1835         return rc;
1836
1837 tcon_error_exit:
1838         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1839                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1840         }
1841         goto tcon_exit;
1842 }
1843
1844 int
1845 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1846 {
1847         struct smb_rqst rqst;
1848         struct smb2_tree_disconnect_req *req; /* response is trivial */
1849         int rc = 0;
1850         struct cifs_ses *ses = tcon->ses;
1851         int flags = 0;
1852         unsigned int total_len;
1853         struct kvec iov[1];
1854         struct kvec rsp_iov;
1855         int resp_buf_type;
1856
1857         cifs_dbg(FYI, "Tree Disconnect\n");
1858
1859         if (!ses || !(ses->server))
1860                 return -EIO;
1861
1862         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1863                 return 0;
1864
1865         close_cached_dir_lease(&tcon->crfid);
1866
1867         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
1868                                  (void **) &req,
1869                                  &total_len);
1870         if (rc)
1871                 return rc;
1872
1873         if (smb3_encryption_required(tcon))
1874                 flags |= CIFS_TRANSFORM_REQ;
1875
1876         flags |= CIFS_NO_RSP_BUF;
1877
1878         iov[0].iov_base = (char *)req;
1879         iov[0].iov_len = total_len;
1880
1881         memset(&rqst, 0, sizeof(struct smb_rqst));
1882         rqst.rq_iov = iov;
1883         rqst.rq_nvec = 1;
1884
1885         rc = cifs_send_recv(xid, ses, ses->server,
1886                             &rqst, &resp_buf_type, flags, &rsp_iov);
1887         cifs_small_buf_release(req);
1888         if (rc)
1889                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1890
1891         return rc;
1892 }
1893
1894
1895 static struct create_durable *
1896 create_durable_buf(void)
1897 {
1898         struct create_durable *buf;
1899
1900         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1901         if (!buf)
1902                 return NULL;
1903
1904         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1905                                         (struct create_durable, Data));
1906         buf->ccontext.DataLength = cpu_to_le32(16);
1907         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1908                                 (struct create_durable, Name));
1909         buf->ccontext.NameLength = cpu_to_le16(4);
1910         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1911         buf->Name[0] = 'D';
1912         buf->Name[1] = 'H';
1913         buf->Name[2] = 'n';
1914         buf->Name[3] = 'Q';
1915         return buf;
1916 }
1917
1918 static struct create_durable *
1919 create_reconnect_durable_buf(struct cifs_fid *fid)
1920 {
1921         struct create_durable *buf;
1922
1923         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1924         if (!buf)
1925                 return NULL;
1926
1927         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1928                                         (struct create_durable, Data));
1929         buf->ccontext.DataLength = cpu_to_le32(16);
1930         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1931                                 (struct create_durable, Name));
1932         buf->ccontext.NameLength = cpu_to_le16(4);
1933         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1934         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1935         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1936         buf->Name[0] = 'D';
1937         buf->Name[1] = 'H';
1938         buf->Name[2] = 'n';
1939         buf->Name[3] = 'C';
1940         return buf;
1941 }
1942
1943 static void
1944 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
1945 {
1946         struct create_on_disk_id *pdisk_id = (struct create_on_disk_id *)cc;
1947
1948         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
1949                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
1950         buf->IndexNumber = pdisk_id->DiskFileId;
1951 }
1952
1953 static void
1954 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
1955                  struct create_posix_rsp *posix)
1956 {
1957         int sid_len;
1958         u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
1959         u8 *end = beg + le32_to_cpu(cc->DataLength);
1960         u8 *sid;
1961
1962         memset(posix, 0, sizeof(*posix));
1963
1964         posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
1965         posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
1966         posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
1967
1968         sid = beg + 12;
1969         sid_len = posix_info_sid_size(sid, end);
1970         if (sid_len < 0) {
1971                 cifs_dbg(VFS, "bad owner sid in posix create response\n");
1972                 return;
1973         }
1974         memcpy(&posix->owner, sid, sid_len);
1975
1976         sid = sid + sid_len;
1977         sid_len = posix_info_sid_size(sid, end);
1978         if (sid_len < 0) {
1979                 cifs_dbg(VFS, "bad group sid in posix create response\n");
1980                 return;
1981         }
1982         memcpy(&posix->group, sid, sid_len);
1983
1984         cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
1985                  posix->nlink, posix->mode, posix->reparse_tag);
1986 }
1987
1988 void
1989 smb2_parse_contexts(struct TCP_Server_Info *server,
1990                     struct smb2_create_rsp *rsp,
1991                     unsigned int *epoch, char *lease_key, __u8 *oplock,
1992                     struct smb2_file_all_info *buf,
1993                     struct create_posix_rsp *posix)
1994 {
1995         char *data_offset;
1996         struct create_context *cc;
1997         unsigned int next;
1998         unsigned int remaining;
1999         char *name;
2000         static const char smb3_create_tag_posix[] = {
2001                 0x93, 0xAD, 0x25, 0x50, 0x9C,
2002                 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2003                 0xDE, 0x96, 0x8B, 0xCD, 0x7C
2004         };
2005
2006         *oplock = 0;
2007         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
2008         remaining = le32_to_cpu(rsp->CreateContextsLength);
2009         cc = (struct create_context *)data_offset;
2010
2011         /* Initialize inode number to 0 in case no valid data in qfid context */
2012         if (buf)
2013                 buf->IndexNumber = 0;
2014
2015         while (remaining >= sizeof(struct create_context)) {
2016                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
2017                 if (le16_to_cpu(cc->NameLength) == 4 &&
2018                     strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
2019                         *oplock = server->ops->parse_lease_buf(cc, epoch,
2020                                                            lease_key);
2021                 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
2022                     strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
2023                         parse_query_id_ctxt(cc, buf);
2024                 else if ((le16_to_cpu(cc->NameLength) == 16)) {
2025                         if (posix &&
2026                             memcmp(name, smb3_create_tag_posix, 16) == 0)
2027                                 parse_posix_ctxt(cc, buf, posix);
2028                 }
2029                 /* else {
2030                         cifs_dbg(FYI, "Context not matched with len %d\n",
2031                                 le16_to_cpu(cc->NameLength));
2032                         cifs_dump_mem("Cctxt name: ", name, 4);
2033                 } */
2034
2035                 next = le32_to_cpu(cc->Next);
2036                 if (!next)
2037                         break;
2038                 remaining -= next;
2039                 cc = (struct create_context *)((char *)cc + next);
2040         }
2041
2042         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2043                 *oplock = rsp->OplockLevel;
2044
2045         return;
2046 }
2047
2048 static int
2049 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
2050                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2051 {
2052         struct smb2_create_req *req = iov[0].iov_base;
2053         unsigned int num = *num_iovec;
2054
2055         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2056         if (iov[num].iov_base == NULL)
2057                 return -ENOMEM;
2058         iov[num].iov_len = server->vals->create_lease_size;
2059         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2060         if (!req->CreateContextsOffset)
2061                 req->CreateContextsOffset = cpu_to_le32(
2062                                 sizeof(struct smb2_create_req) +
2063                                 iov[num - 1].iov_len);
2064         le32_add_cpu(&req->CreateContextsLength,
2065                      server->vals->create_lease_size);
2066         *num_iovec = num + 1;
2067         return 0;
2068 }
2069
2070 static struct create_durable_v2 *
2071 create_durable_v2_buf(struct cifs_open_parms *oparms)
2072 {
2073         struct cifs_fid *pfid = oparms->fid;
2074         struct create_durable_v2 *buf;
2075
2076         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2077         if (!buf)
2078                 return NULL;
2079
2080         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2081                                         (struct create_durable_v2, dcontext));
2082         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2083         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2084                                 (struct create_durable_v2, Name));
2085         buf->ccontext.NameLength = cpu_to_le16(4);
2086
2087         /*
2088          * NB: Handle timeout defaults to 0, which allows server to choose
2089          * (most servers default to 120 seconds) and most clients default to 0.
2090          * This can be overridden at mount ("handletimeout=") if the user wants
2091          * a different persistent (or resilient) handle timeout for all opens
2092          * opens on a particular SMB3 mount.
2093          */
2094         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2095         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2096         generate_random_uuid(buf->dcontext.CreateGuid);
2097         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2098
2099         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2100         buf->Name[0] = 'D';
2101         buf->Name[1] = 'H';
2102         buf->Name[2] = '2';
2103         buf->Name[3] = 'Q';
2104         return buf;
2105 }
2106
2107 static struct create_durable_handle_reconnect_v2 *
2108 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2109 {
2110         struct create_durable_handle_reconnect_v2 *buf;
2111
2112         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2113                         GFP_KERNEL);
2114         if (!buf)
2115                 return NULL;
2116
2117         buf->ccontext.DataOffset =
2118                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2119                                      dcontext));
2120         buf->ccontext.DataLength =
2121                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2122         buf->ccontext.NameOffset =
2123                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2124                             Name));
2125         buf->ccontext.NameLength = cpu_to_le16(4);
2126
2127         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2128         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2129         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2130         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2131
2132         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2133         buf->Name[0] = 'D';
2134         buf->Name[1] = 'H';
2135         buf->Name[2] = '2';
2136         buf->Name[3] = 'C';
2137         return buf;
2138 }
2139
2140 static int
2141 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2142                     struct cifs_open_parms *oparms)
2143 {
2144         struct smb2_create_req *req = iov[0].iov_base;
2145         unsigned int num = *num_iovec;
2146
2147         iov[num].iov_base = create_durable_v2_buf(oparms);
2148         if (iov[num].iov_base == NULL)
2149                 return -ENOMEM;
2150         iov[num].iov_len = sizeof(struct create_durable_v2);
2151         if (!req->CreateContextsOffset)
2152                 req->CreateContextsOffset =
2153                         cpu_to_le32(sizeof(struct smb2_create_req) +
2154                                                                 iov[1].iov_len);
2155         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
2156         *num_iovec = num + 1;
2157         return 0;
2158 }
2159
2160 static int
2161 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2162                     struct cifs_open_parms *oparms)
2163 {
2164         struct smb2_create_req *req = iov[0].iov_base;
2165         unsigned int num = *num_iovec;
2166
2167         /* indicate that we don't need to relock the file */
2168         oparms->reconnect = false;
2169
2170         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2171         if (iov[num].iov_base == NULL)
2172                 return -ENOMEM;
2173         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2174         if (!req->CreateContextsOffset)
2175                 req->CreateContextsOffset =
2176                         cpu_to_le32(sizeof(struct smb2_create_req) +
2177                                                                 iov[1].iov_len);
2178         le32_add_cpu(&req->CreateContextsLength,
2179                         sizeof(struct create_durable_handle_reconnect_v2));
2180         *num_iovec = num + 1;
2181         return 0;
2182 }
2183
2184 static int
2185 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2186                     struct cifs_open_parms *oparms, bool use_persistent)
2187 {
2188         struct smb2_create_req *req = iov[0].iov_base;
2189         unsigned int num = *num_iovec;
2190
2191         if (use_persistent) {
2192                 if (oparms->reconnect)
2193                         return add_durable_reconnect_v2_context(iov, num_iovec,
2194                                                                 oparms);
2195                 else
2196                         return add_durable_v2_context(iov, num_iovec, oparms);
2197         }
2198
2199         if (oparms->reconnect) {
2200                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2201                 /* indicate that we don't need to relock the file */
2202                 oparms->reconnect = false;
2203         } else
2204                 iov[num].iov_base = create_durable_buf();
2205         if (iov[num].iov_base == NULL)
2206                 return -ENOMEM;
2207         iov[num].iov_len = sizeof(struct create_durable);
2208         if (!req->CreateContextsOffset)
2209                 req->CreateContextsOffset =
2210                         cpu_to_le32(sizeof(struct smb2_create_req) +
2211                                                                 iov[1].iov_len);
2212         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
2213         *num_iovec = num + 1;
2214         return 0;
2215 }
2216
2217 /* See MS-SMB2 2.2.13.2.7 */
2218 static struct crt_twarp_ctxt *
2219 create_twarp_buf(__u64 timewarp)
2220 {
2221         struct crt_twarp_ctxt *buf;
2222
2223         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2224         if (!buf)
2225                 return NULL;
2226
2227         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2228                                         (struct crt_twarp_ctxt, Timestamp));
2229         buf->ccontext.DataLength = cpu_to_le32(8);
2230         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2231                                 (struct crt_twarp_ctxt, Name));
2232         buf->ccontext.NameLength = cpu_to_le16(4);
2233         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2234         buf->Name[0] = 'T';
2235         buf->Name[1] = 'W';
2236         buf->Name[2] = 'r';
2237         buf->Name[3] = 'p';
2238         buf->Timestamp = cpu_to_le64(timewarp);
2239         return buf;
2240 }
2241
2242 /* See MS-SMB2 2.2.13.2.7 */
2243 static int
2244 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2245 {
2246         struct smb2_create_req *req = iov[0].iov_base;
2247         unsigned int num = *num_iovec;
2248
2249         iov[num].iov_base = create_twarp_buf(timewarp);
2250         if (iov[num].iov_base == NULL)
2251                 return -ENOMEM;
2252         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2253         if (!req->CreateContextsOffset)
2254                 req->CreateContextsOffset = cpu_to_le32(
2255                                 sizeof(struct smb2_create_req) +
2256                                 iov[num - 1].iov_len);
2257         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
2258         *num_iovec = num + 1;
2259         return 0;
2260 }
2261
2262 /* See See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2263 static void setup_owner_group_sids(char *buf)
2264 {
2265         struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2266
2267         /* Populate the user ownership fields S-1-5-88-1 */
2268         sids->owner.Revision = 1;
2269         sids->owner.NumAuth = 3;
2270         sids->owner.Authority[5] = 5;
2271         sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2272         sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2273         sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2274
2275         /* Populate the group ownership fields S-1-5-88-2 */
2276         sids->group.Revision = 1;
2277         sids->group.NumAuth = 3;
2278         sids->group.Authority[5] = 5;
2279         sids->group.SubAuthorities[0] = cpu_to_le32(88);
2280         sids->group.SubAuthorities[1] = cpu_to_le32(2);
2281         sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2282
2283         cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2284 }
2285
2286 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2287 static struct crt_sd_ctxt *
2288 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2289 {
2290         struct crt_sd_ctxt *buf;
2291         __u8 *ptr, *aclptr;
2292         unsigned int acelen, acl_size, ace_count;
2293         unsigned int owner_offset = 0;
2294         unsigned int group_offset = 0;
2295         struct smb3_acl acl;
2296
2297         *len = roundup(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
2298
2299         if (set_owner) {
2300                 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2301                 *len += sizeof(struct owner_group_sids);
2302         }
2303
2304         buf = kzalloc(*len, GFP_KERNEL);
2305         if (buf == NULL)
2306                 return buf;
2307
2308         ptr = (__u8 *)&buf[1];
2309         if (set_owner) {
2310                 /* offset fields are from beginning of security descriptor not of create context */
2311                 owner_offset = ptr - (__u8 *)&buf->sd;
2312                 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2313                 group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2314                 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2315
2316                 setup_owner_group_sids(ptr);
2317                 ptr += sizeof(struct owner_group_sids);
2318         } else {
2319                 buf->sd.OffsetOwner = 0;
2320                 buf->sd.OffsetGroup = 0;
2321         }
2322
2323         buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2324         buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2325         buf->ccontext.NameLength = cpu_to_le16(4);
2326         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2327         buf->Name[0] = 'S';
2328         buf->Name[1] = 'e';
2329         buf->Name[2] = 'c';
2330         buf->Name[3] = 'D';
2331         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2332
2333         /*
2334          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2335          * and "DP" ie the DACL is present
2336          */
2337         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2338
2339         /* offset owner, group and Sbz1 and SACL are all zero */
2340         buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2341         /* Ship the ACL for now. we will copy it into buf later. */
2342         aclptr = ptr;
2343         ptr += sizeof(struct cifs_acl);
2344
2345         /* create one ACE to hold the mode embedded in reserved special SID */
2346         acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode);
2347         ptr += acelen;
2348         acl_size = acelen + sizeof(struct smb3_acl);
2349         ace_count = 1;
2350
2351         if (set_owner) {
2352                 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2353                 acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr);
2354                 ptr += acelen;
2355                 acl_size += acelen;
2356                 ace_count += 1;
2357         }
2358
2359         /* and one more ACE to allow access for authenticated users */
2360         acelen = setup_authusers_ACE((struct cifs_ace *)ptr);
2361         ptr += acelen;
2362         acl_size += acelen;
2363         ace_count += 1;
2364
2365         acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2366         acl.AclSize = cpu_to_le16(acl_size);
2367         acl.AceCount = cpu_to_le16(ace_count);
2368         memcpy(aclptr, &acl, sizeof(struct cifs_acl));
2369
2370         buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2371         *len = ptr - (__u8 *)buf;
2372
2373         return buf;
2374 }
2375
2376 static int
2377 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2378 {
2379         struct smb2_create_req *req = iov[0].iov_base;
2380         unsigned int num = *num_iovec;
2381         unsigned int len = 0;
2382
2383         iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2384         if (iov[num].iov_base == NULL)
2385                 return -ENOMEM;
2386         iov[num].iov_len = len;
2387         if (!req->CreateContextsOffset)
2388                 req->CreateContextsOffset = cpu_to_le32(
2389                                 sizeof(struct smb2_create_req) +
2390                                 iov[num - 1].iov_len);
2391         le32_add_cpu(&req->CreateContextsLength, len);
2392         *num_iovec = num + 1;
2393         return 0;
2394 }
2395
2396 static struct crt_query_id_ctxt *
2397 create_query_id_buf(void)
2398 {
2399         struct crt_query_id_ctxt *buf;
2400
2401         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2402         if (!buf)
2403                 return NULL;
2404
2405         buf->ccontext.DataOffset = cpu_to_le16(0);
2406         buf->ccontext.DataLength = cpu_to_le32(0);
2407         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2408                                 (struct crt_query_id_ctxt, Name));
2409         buf->ccontext.NameLength = cpu_to_le16(4);
2410         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2411         buf->Name[0] = 'Q';
2412         buf->Name[1] = 'F';
2413         buf->Name[2] = 'i';
2414         buf->Name[3] = 'd';
2415         return buf;
2416 }
2417
2418 /* See MS-SMB2 2.2.13.2.9 */
2419 static int
2420 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2421 {
2422         struct smb2_create_req *req = iov[0].iov_base;
2423         unsigned int num = *num_iovec;
2424
2425         iov[num].iov_base = create_query_id_buf();
2426         if (iov[num].iov_base == NULL)
2427                 return -ENOMEM;
2428         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2429         if (!req->CreateContextsOffset)
2430                 req->CreateContextsOffset = cpu_to_le32(
2431                                 sizeof(struct smb2_create_req) +
2432                                 iov[num - 1].iov_len);
2433         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_query_id_ctxt));
2434         *num_iovec = num + 1;
2435         return 0;
2436 }
2437
2438 static int
2439 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2440                             const char *treename, const __le16 *path)
2441 {
2442         int treename_len, path_len;
2443         struct nls_table *cp;
2444         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2445
2446         /*
2447          * skip leading "\\"
2448          */
2449         treename_len = strlen(treename);
2450         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2451                 return -EINVAL;
2452
2453         treename += 2;
2454         treename_len -= 2;
2455
2456         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2457
2458         /*
2459          * make room for one path separator between the treename and
2460          * path
2461          */
2462         *out_len = treename_len + 1 + path_len;
2463
2464         /*
2465          * final path needs to be null-terminated UTF16 with a
2466          * size aligned to 8
2467          */
2468
2469         *out_size = roundup((*out_len+1)*2, 8);
2470         *out_path = kzalloc(*out_size, GFP_KERNEL);
2471         if (!*out_path)
2472                 return -ENOMEM;
2473
2474         cp = load_nls_default();
2475         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2476         UniStrcat(*out_path, sep);
2477         UniStrcat(*out_path, path);
2478         unload_nls(cp);
2479
2480         return 0;
2481 }
2482
2483 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2484                                umode_t mode, struct cifs_tcon *tcon,
2485                                const char *full_path,
2486                                struct cifs_sb_info *cifs_sb)
2487 {
2488         struct smb_rqst rqst;
2489         struct smb2_create_req *req;
2490         struct smb2_create_rsp *rsp = NULL;
2491         struct cifs_ses *ses = tcon->ses;
2492         struct kvec iov[3]; /* make sure at least one for each open context */
2493         struct kvec rsp_iov = {NULL, 0};
2494         int resp_buftype;
2495         int uni_path_len;
2496         __le16 *copy_path = NULL;
2497         int copy_size;
2498         int rc = 0;
2499         unsigned int n_iov = 2;
2500         __u32 file_attributes = 0;
2501         char *pc_buf = NULL;
2502         int flags = 0;
2503         unsigned int total_len;
2504         __le16 *utf16_path = NULL;
2505         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2506
2507         cifs_dbg(FYI, "mkdir\n");
2508
2509         /* resource #1: path allocation */
2510         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2511         if (!utf16_path)
2512                 return -ENOMEM;
2513
2514         if (!ses || !server) {
2515                 rc = -EIO;
2516                 goto err_free_path;
2517         }
2518
2519         /* resource #2: request */
2520         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2521                                  (void **) &req, &total_len);
2522         if (rc)
2523                 goto err_free_path;
2524
2525
2526         if (smb3_encryption_required(tcon))
2527                 flags |= CIFS_TRANSFORM_REQ;
2528
2529         req->ImpersonationLevel = IL_IMPERSONATION;
2530         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2531         /* File attributes ignored on open (used in create though) */
2532         req->FileAttributes = cpu_to_le32(file_attributes);
2533         req->ShareAccess = FILE_SHARE_ALL_LE;
2534         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2535         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2536
2537         iov[0].iov_base = (char *)req;
2538         /* -1 since last byte is buf[0] which is sent below (path) */
2539         iov[0].iov_len = total_len - 1;
2540
2541         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2542
2543         /* [MS-SMB2] 2.2.13 NameOffset:
2544          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2545          * the SMB2 header, the file name includes a prefix that will
2546          * be processed during DFS name normalization as specified in
2547          * section 3.3.5.9. Otherwise, the file name is relative to
2548          * the share that is identified by the TreeId in the SMB2
2549          * header.
2550          */
2551         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2552                 int name_len;
2553
2554                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2555                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2556                                                  &name_len,
2557                                                  tcon->treeName, utf16_path);
2558                 if (rc)
2559                         goto err_free_req;
2560
2561                 req->NameLength = cpu_to_le16(name_len * 2);
2562                 uni_path_len = copy_size;
2563                 /* free before overwriting resource */
2564                 kfree(utf16_path);
2565                 utf16_path = copy_path;
2566         } else {
2567                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2568                 /* MUST set path len (NameLength) to 0 opening root of share */
2569                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2570                 if (uni_path_len % 8 != 0) {
2571                         copy_size = roundup(uni_path_len, 8);
2572                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2573                         if (!copy_path) {
2574                                 rc = -ENOMEM;
2575                                 goto err_free_req;
2576                         }
2577                         memcpy((char *)copy_path, (const char *)utf16_path,
2578                                uni_path_len);
2579                         uni_path_len = copy_size;
2580                         /* free before overwriting resource */
2581                         kfree(utf16_path);
2582                         utf16_path = copy_path;
2583                 }
2584         }
2585
2586         iov[1].iov_len = uni_path_len;
2587         iov[1].iov_base = utf16_path;
2588         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2589
2590         if (tcon->posix_extensions) {
2591                 /* resource #3: posix buf */
2592                 rc = add_posix_context(iov, &n_iov, mode);
2593                 if (rc)
2594                         goto err_free_req;
2595                 pc_buf = iov[n_iov-1].iov_base;
2596         }
2597
2598
2599         memset(&rqst, 0, sizeof(struct smb_rqst));
2600         rqst.rq_iov = iov;
2601         rqst.rq_nvec = n_iov;
2602
2603         /* no need to inc num_remote_opens because we close it just below */
2604         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, CREATE_NOT_FILE,
2605                                     FILE_WRITE_ATTRIBUTES);
2606         /* resource #4: response buffer */
2607         rc = cifs_send_recv(xid, ses, server,
2608                             &rqst, &resp_buftype, flags, &rsp_iov);
2609         if (rc) {
2610                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2611                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2612                                            CREATE_NOT_FILE,
2613                                            FILE_WRITE_ATTRIBUTES, rc);
2614                 goto err_free_rsp_buf;
2615         }
2616
2617         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2618         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2619                                     ses->Suid, CREATE_NOT_FILE,
2620                                     FILE_WRITE_ATTRIBUTES);
2621
2622         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2623
2624         /* Eventually save off posix specific response info and timestaps */
2625
2626 err_free_rsp_buf:
2627         free_rsp_buf(resp_buftype, rsp);
2628         kfree(pc_buf);
2629 err_free_req:
2630         cifs_small_buf_release(req);
2631 err_free_path:
2632         kfree(utf16_path);
2633         return rc;
2634 }
2635
2636 int
2637 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2638                struct smb_rqst *rqst, __u8 *oplock,
2639                struct cifs_open_parms *oparms, __le16 *path)
2640 {
2641         struct smb2_create_req *req;
2642         unsigned int n_iov = 2;
2643         __u32 file_attributes = 0;
2644         int copy_size;
2645         int uni_path_len;
2646         unsigned int total_len;
2647         struct kvec *iov = rqst->rq_iov;
2648         __le16 *copy_path;
2649         int rc;
2650
2651         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2652                                  (void **) &req, &total_len);
2653         if (rc)
2654                 return rc;
2655
2656         iov[0].iov_base = (char *)req;
2657         /* -1 since last byte is buf[0] which is sent below (path) */
2658         iov[0].iov_len = total_len - 1;
2659
2660         if (oparms->create_options & CREATE_OPTION_READONLY)
2661                 file_attributes |= ATTR_READONLY;
2662         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2663                 file_attributes |= ATTR_SYSTEM;
2664
2665         req->ImpersonationLevel = IL_IMPERSONATION;
2666         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2667         /* File attributes ignored on open (used in create though) */
2668         req->FileAttributes = cpu_to_le32(file_attributes);
2669         req->ShareAccess = FILE_SHARE_ALL_LE;
2670
2671         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2672         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2673         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2674
2675         /* [MS-SMB2] 2.2.13 NameOffset:
2676          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2677          * the SMB2 header, the file name includes a prefix that will
2678          * be processed during DFS name normalization as specified in
2679          * section 3.3.5.9. Otherwise, the file name is relative to
2680          * the share that is identified by the TreeId in the SMB2
2681          * header.
2682          */
2683         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2684                 int name_len;
2685
2686                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2687                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2688                                                  &name_len,
2689                                                  tcon->treeName, path);
2690                 if (rc)
2691                         return rc;
2692                 req->NameLength = cpu_to_le16(name_len * 2);
2693                 uni_path_len = copy_size;
2694                 path = copy_path;
2695         } else {
2696                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2697                 /* MUST set path len (NameLength) to 0 opening root of share */
2698                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2699                 copy_size = uni_path_len;
2700                 if (copy_size % 8 != 0)
2701                         copy_size = roundup(copy_size, 8);
2702                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2703                 if (!copy_path)
2704                         return -ENOMEM;
2705                 memcpy((char *)copy_path, (const char *)path,
2706                        uni_path_len);
2707                 uni_path_len = copy_size;
2708                 path = copy_path;
2709         }
2710
2711         iov[1].iov_len = uni_path_len;
2712         iov[1].iov_base = path;
2713
2714         if ((!server->oplocks) || (tcon->no_lease))
2715                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2716
2717         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2718             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2719                 req->RequestedOplockLevel = *oplock;
2720         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2721                   (oparms->create_options & CREATE_NOT_FILE))
2722                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2723         else {
2724                 rc = add_lease_context(server, iov, &n_iov,
2725                                        oparms->fid->lease_key, oplock);
2726                 if (rc)
2727                         return rc;
2728         }
2729
2730         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2731                 /* need to set Next field of lease context if we request it */
2732                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2733                         struct create_context *ccontext =
2734                             (struct create_context *)iov[n_iov-1].iov_base;
2735                         ccontext->Next =
2736                                 cpu_to_le32(server->vals->create_lease_size);
2737                 }
2738
2739                 rc = add_durable_context(iov, &n_iov, oparms,
2740                                         tcon->use_persistent);
2741                 if (rc)
2742                         return rc;
2743         }
2744
2745         if (tcon->posix_extensions) {
2746                 if (n_iov > 2) {
2747                         struct create_context *ccontext =
2748                             (struct create_context *)iov[n_iov-1].iov_base;
2749                         ccontext->Next =
2750                                 cpu_to_le32(iov[n_iov-1].iov_len);
2751                 }
2752
2753                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2754                 if (rc)
2755                         return rc;
2756         }
2757
2758         if (tcon->snapshot_time) {
2759                 cifs_dbg(FYI, "adding snapshot context\n");
2760                 if (n_iov > 2) {
2761                         struct create_context *ccontext =
2762                             (struct create_context *)iov[n_iov-1].iov_base;
2763                         ccontext->Next =
2764                                 cpu_to_le32(iov[n_iov-1].iov_len);
2765                 }
2766
2767                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2768                 if (rc)
2769                         return rc;
2770         }
2771
2772         if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
2773                 bool set_mode;
2774                 bool set_owner;
2775
2776                 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2777                     (oparms->mode != ACL_NO_MODE))
2778                         set_mode = true;
2779                 else {
2780                         set_mode = false;
2781                         oparms->mode = ACL_NO_MODE;
2782                 }
2783
2784                 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
2785                         set_owner = true;
2786                 else
2787                         set_owner = false;
2788
2789                 if (set_owner | set_mode) {
2790                         if (n_iov > 2) {
2791                                 struct create_context *ccontext =
2792                                     (struct create_context *)iov[n_iov-1].iov_base;
2793                                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2794                         }
2795
2796                         cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2797                         rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
2798                         if (rc)
2799                                 return rc;
2800                 }
2801         }
2802
2803         if (n_iov > 2) {
2804                 struct create_context *ccontext =
2805                         (struct create_context *)iov[n_iov-1].iov_base;
2806                 ccontext->Next = cpu_to_le32(iov[n_iov-1].iov_len);
2807         }
2808         add_query_id_context(iov, &n_iov);
2809
2810         rqst->rq_nvec = n_iov;
2811         return 0;
2812 }
2813
2814 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2815  * All other vectors are freed by kfree().
2816  */
2817 void
2818 SMB2_open_free(struct smb_rqst *rqst)
2819 {
2820         int i;
2821
2822         if (rqst && rqst->rq_iov) {
2823                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2824                 for (i = 1; i < rqst->rq_nvec; i++)
2825                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2826                                 kfree(rqst->rq_iov[i].iov_base);
2827         }
2828 }
2829
2830 int
2831 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2832           __u8 *oplock, struct smb2_file_all_info *buf,
2833           struct create_posix_rsp *posix,
2834           struct kvec *err_iov, int *buftype)
2835 {
2836         struct smb_rqst rqst;
2837         struct smb2_create_rsp *rsp = NULL;
2838         struct cifs_tcon *tcon = oparms->tcon;
2839         struct cifs_ses *ses = tcon->ses;
2840         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2841         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2842         struct kvec rsp_iov = {NULL, 0};
2843         int resp_buftype = CIFS_NO_BUFFER;
2844         int rc = 0;
2845         int flags = 0;
2846
2847         cifs_dbg(FYI, "create/open\n");
2848         if (!ses || !server)
2849                 return -EIO;
2850
2851         if (smb3_encryption_required(tcon))
2852                 flags |= CIFS_TRANSFORM_REQ;
2853
2854         memset(&rqst, 0, sizeof(struct smb_rqst));
2855         memset(&iov, 0, sizeof(iov));
2856         rqst.rq_iov = iov;
2857         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2858
2859         rc = SMB2_open_init(tcon, server,
2860                             &rqst, oplock, oparms, path);
2861         if (rc)
2862                 goto creat_exit;
2863
2864         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid,
2865                 oparms->create_options, oparms->desired_access);
2866
2867         rc = cifs_send_recv(xid, ses, server,
2868                             &rqst, &resp_buftype, flags,
2869                             &rsp_iov);
2870         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2871
2872         if (rc != 0) {
2873                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2874                 if (err_iov && rsp) {
2875                         *err_iov = rsp_iov;
2876                         *buftype = resp_buftype;
2877                         resp_buftype = CIFS_NO_BUFFER;
2878                         rsp = NULL;
2879                 }
2880                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2881                                     oparms->create_options, oparms->desired_access, rc);
2882                 if (rc == -EREMCHG) {
2883                         pr_warn_once("server share %s deleted\n",
2884                                      tcon->treeName);
2885                         tcon->need_reconnect = true;
2886                 }
2887                 goto creat_exit;
2888         } else
2889                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2890                                      ses->Suid, oparms->create_options,
2891                                      oparms->desired_access);
2892
2893         atomic_inc(&tcon->num_remote_opens);
2894         oparms->fid->persistent_fid = rsp->PersistentFileId;
2895         oparms->fid->volatile_fid = rsp->VolatileFileId;
2896         oparms->fid->access = oparms->desired_access;
2897 #ifdef CONFIG_CIFS_DEBUG2
2898         oparms->fid->mid = le64_to_cpu(rsp->sync_hdr.MessageId);
2899 #endif /* CIFS_DEBUG2 */
2900
2901         if (buf) {
2902                 memcpy(buf, &rsp->CreationTime, 32);
2903                 buf->AllocationSize = rsp->AllocationSize;
2904                 buf->EndOfFile = rsp->EndofFile;
2905                 buf->Attributes = rsp->FileAttributes;
2906                 buf->NumberOfLinks = cpu_to_le32(1);
2907                 buf->DeletePending = 0;
2908         }
2909
2910
2911         smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
2912                             oparms->fid->lease_key, oplock, buf, posix);
2913 creat_exit:
2914         SMB2_open_free(&rqst);
2915         free_rsp_buf(resp_buftype, rsp);
2916         return rc;
2917 }
2918
2919 int
2920 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2921                 struct smb_rqst *rqst,
2922                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
2923                 bool is_fsctl, char *in_data, u32 indatalen,
2924                 __u32 max_response_size)
2925 {
2926         struct smb2_ioctl_req *req;
2927         struct kvec *iov = rqst->rq_iov;
2928         unsigned int total_len;
2929         int rc;
2930         char *in_data_buf;
2931
2932         rc = smb2_ioctl_req_init(opcode, tcon, server,
2933                                  (void **) &req, &total_len);
2934         if (rc)
2935                 return rc;
2936
2937         if (indatalen) {
2938                 /*
2939                  * indatalen is usually small at a couple of bytes max, so
2940                  * just allocate through generic pool
2941                  */
2942                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
2943                 if (!in_data_buf) {
2944                         cifs_small_buf_release(req);
2945                         return -ENOMEM;
2946                 }
2947         }
2948
2949         req->CtlCode = cpu_to_le32(opcode);
2950         req->PersistentFileId = persistent_fid;
2951         req->VolatileFileId = volatile_fid;
2952
2953         iov[0].iov_base = (char *)req;
2954         /*
2955          * If no input data, the size of ioctl struct in
2956          * protocol spec still includes a 1 byte data buffer,
2957          * but if input data passed to ioctl, we do not
2958          * want to double count this, so we do not send
2959          * the dummy one byte of data in iovec[0] if sending
2960          * input data (in iovec[1]).
2961          */
2962         if (indatalen) {
2963                 req->InputCount = cpu_to_le32(indatalen);
2964                 /* do not set InputOffset if no input data */
2965                 req->InputOffset =
2966                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2967                 rqst->rq_nvec = 2;
2968                 iov[0].iov_len = total_len - 1;
2969                 iov[1].iov_base = in_data_buf;
2970                 iov[1].iov_len = indatalen;
2971         } else {
2972                 rqst->rq_nvec = 1;
2973                 iov[0].iov_len = total_len;
2974         }
2975
2976         req->OutputOffset = 0;
2977         req->OutputCount = 0; /* MBZ */
2978
2979         /*
2980          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
2981          * We Could increase default MaxOutputResponse, but that could require
2982          * more credits. Windows typically sets this smaller, but for some
2983          * ioctls it may be useful to allow server to send more. No point
2984          * limiting what the server can send as long as fits in one credit
2985          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
2986          * to increase this limit up in the future.
2987          * Note that for snapshot queries that servers like Azure expect that
2988          * the first query be minimal size (and just used to get the number/size
2989          * of previous versions) so response size must be specified as EXACTLY
2990          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
2991          * of eight bytes.  Currently that is the only case where we set max
2992          * response size smaller.
2993          */
2994         req->MaxOutputResponse = cpu_to_le32(max_response_size);
2995         req->sync_hdr.CreditCharge =
2996                 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
2997                                          SMB2_MAX_BUFFER_SIZE));
2998         if (is_fsctl)
2999                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
3000         else
3001                 req->Flags = 0;
3002
3003         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3004         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3005                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
3006
3007         return 0;
3008 }
3009
3010 void
3011 SMB2_ioctl_free(struct smb_rqst *rqst)
3012 {
3013         int i;
3014         if (rqst && rqst->rq_iov) {
3015                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3016                 for (i = 1; i < rqst->rq_nvec; i++)
3017                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3018                                 kfree(rqst->rq_iov[i].iov_base);
3019         }
3020 }
3021
3022
3023 /*
3024  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
3025  */
3026 int
3027 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3028            u64 volatile_fid, u32 opcode, bool is_fsctl,
3029            char *in_data, u32 indatalen, u32 max_out_data_len,
3030            char **out_data, u32 *plen /* returned data len */)
3031 {
3032         struct smb_rqst rqst;
3033         struct smb2_ioctl_rsp *rsp = NULL;
3034         struct cifs_ses *ses;
3035         struct TCP_Server_Info *server;
3036         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3037         struct kvec rsp_iov = {NULL, 0};
3038         int resp_buftype = CIFS_NO_BUFFER;
3039         int rc = 0;
3040         int flags = 0;
3041
3042         cifs_dbg(FYI, "SMB2 IOCTL\n");
3043
3044         if (out_data != NULL)
3045                 *out_data = NULL;
3046
3047         /* zero out returned data len, in case of error */
3048         if (plen)
3049                 *plen = 0;
3050
3051         if (!tcon)
3052                 return -EIO;
3053
3054         ses = tcon->ses;
3055         if (!ses)
3056                 return -EIO;
3057
3058         server = cifs_pick_channel(ses);
3059         if (!server)
3060                 return -EIO;
3061
3062         if (smb3_encryption_required(tcon))
3063                 flags |= CIFS_TRANSFORM_REQ;
3064
3065         memset(&rqst, 0, sizeof(struct smb_rqst));
3066         memset(&iov, 0, sizeof(iov));
3067         rqst.rq_iov = iov;
3068         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3069
3070         rc = SMB2_ioctl_init(tcon, server,
3071                              &rqst, persistent_fid, volatile_fid, opcode,
3072                              is_fsctl, in_data, indatalen, max_out_data_len);
3073         if (rc)
3074                 goto ioctl_exit;
3075
3076         rc = cifs_send_recv(xid, ses, server,
3077                             &rqst, &resp_buftype, flags,
3078                             &rsp_iov);
3079         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3080
3081         if (rc != 0)
3082                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3083                                 ses->Suid, 0, opcode, rc);
3084
3085         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3086                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3087                 goto ioctl_exit;
3088         } else if (rc == -EINVAL) {
3089                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3090                     (opcode != FSCTL_SRV_COPYCHUNK)) {
3091                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3092                         goto ioctl_exit;
3093                 }
3094         } else if (rc == -E2BIG) {
3095                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3096                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3097                         goto ioctl_exit;
3098                 }
3099         }
3100
3101         /* check if caller wants to look at return data or just return rc */
3102         if ((plen == NULL) || (out_data == NULL))
3103                 goto ioctl_exit;
3104
3105         *plen = le32_to_cpu(rsp->OutputCount);
3106
3107         /* We check for obvious errors in the output buffer length and offset */
3108         if (*plen == 0)
3109                 goto ioctl_exit; /* server returned no data */
3110         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3111                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3112                 *plen = 0;
3113                 rc = -EIO;
3114                 goto ioctl_exit;
3115         }
3116
3117         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3118                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3119                         le32_to_cpu(rsp->OutputOffset));
3120                 *plen = 0;
3121                 rc = -EIO;
3122                 goto ioctl_exit;
3123         }
3124
3125         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3126                             *plen, GFP_KERNEL);
3127         if (*out_data == NULL) {
3128                 rc = -ENOMEM;
3129                 goto ioctl_exit;
3130         }
3131
3132 ioctl_exit:
3133         SMB2_ioctl_free(&rqst);
3134         free_rsp_buf(resp_buftype, rsp);
3135         return rc;
3136 }
3137
3138 /*
3139  *   Individual callers to ioctl worker function follow
3140  */
3141
3142 int
3143 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3144                      u64 persistent_fid, u64 volatile_fid)
3145 {
3146         int rc;
3147         struct  compress_ioctl fsctl_input;
3148         char *ret_data = NULL;
3149
3150         fsctl_input.CompressionState =
3151                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3152
3153         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3154                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
3155                         (char *)&fsctl_input /* data input */,
3156                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3157                         &ret_data /* out data */, NULL);
3158
3159         cifs_dbg(FYI, "set compression rc %d\n", rc);
3160
3161         return rc;
3162 }
3163
3164 int
3165 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3166                 struct smb_rqst *rqst,
3167                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3168 {
3169         struct smb2_close_req *req;
3170         struct kvec *iov = rqst->rq_iov;
3171         unsigned int total_len;
3172         int rc;
3173
3174         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3175                                  (void **) &req, &total_len);
3176         if (rc)
3177                 return rc;
3178
3179         req->PersistentFileId = persistent_fid;
3180         req->VolatileFileId = volatile_fid;
3181         if (query_attrs)
3182                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3183         else
3184                 req->Flags = 0;
3185         iov[0].iov_base = (char *)req;
3186         iov[0].iov_len = total_len;
3187
3188         return 0;
3189 }
3190
3191 void
3192 SMB2_close_free(struct smb_rqst *rqst)
3193 {
3194         if (rqst && rqst->rq_iov)
3195                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3196 }
3197
3198 int
3199 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3200              u64 persistent_fid, u64 volatile_fid,
3201              struct smb2_file_network_open_info *pbuf)
3202 {
3203         struct smb_rqst rqst;
3204         struct smb2_close_rsp *rsp = NULL;
3205         struct cifs_ses *ses = tcon->ses;
3206         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3207         struct kvec iov[1];
3208         struct kvec rsp_iov;
3209         int resp_buftype = CIFS_NO_BUFFER;
3210         int rc = 0;
3211         int flags = 0;
3212         bool query_attrs = false;
3213
3214         cifs_dbg(FYI, "Close\n");
3215
3216         if (!ses || !server)
3217                 return -EIO;
3218
3219         if (smb3_encryption_required(tcon))
3220                 flags |= CIFS_TRANSFORM_REQ;
3221
3222         memset(&rqst, 0, sizeof(struct smb_rqst));
3223         memset(&iov, 0, sizeof(iov));
3224         rqst.rq_iov = iov;
3225         rqst.rq_nvec = 1;
3226
3227         /* check if need to ask server to return timestamps in close response */
3228         if (pbuf)
3229                 query_attrs = true;
3230
3231         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3232         rc = SMB2_close_init(tcon, server,
3233                              &rqst, persistent_fid, volatile_fid,
3234                              query_attrs);
3235         if (rc)
3236                 goto close_exit;
3237
3238         rc = cifs_send_recv(xid, ses, server,
3239                             &rqst, &resp_buftype, flags, &rsp_iov);
3240         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3241
3242         if (rc != 0) {
3243                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3244                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3245                                      rc);
3246                 goto close_exit;
3247         } else {
3248                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3249                                       ses->Suid);
3250                 /*
3251                  * Note that have to subtract 4 since struct network_open_info
3252                  * has a final 4 byte pad that close response does not have
3253                  */
3254                 if (pbuf)
3255                         memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3256         }
3257
3258         atomic_dec(&tcon->num_remote_opens);
3259 close_exit:
3260         SMB2_close_free(&rqst);
3261         free_rsp_buf(resp_buftype, rsp);
3262
3263         /* retry close in a worker thread if this one is interrupted */
3264         if (is_interrupt_error(rc)) {
3265                 int tmp_rc;
3266
3267                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3268                                                      volatile_fid);
3269                 if (tmp_rc)
3270                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3271                                  persistent_fid, tmp_rc);
3272         }
3273         return rc;
3274 }
3275
3276 int
3277 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3278                 u64 persistent_fid, u64 volatile_fid)
3279 {
3280         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3281 }
3282
3283 int
3284 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3285                   struct kvec *iov, unsigned int min_buf_size)
3286 {
3287         unsigned int smb_len = iov->iov_len;
3288         char *end_of_smb = smb_len + (char *)iov->iov_base;
3289         char *begin_of_buf = offset + (char *)iov->iov_base;
3290         char *end_of_buf = begin_of_buf + buffer_length;
3291
3292
3293         if (buffer_length < min_buf_size) {
3294                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3295                          buffer_length, min_buf_size);
3296                 return -EINVAL;
3297         }
3298
3299         /* check if beyond RFC1001 maximum length */
3300         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3301                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3302                          buffer_length, smb_len);
3303                 return -EINVAL;
3304         }
3305
3306         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3307                 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3308                 return -EINVAL;
3309         }
3310
3311         return 0;
3312 }
3313
3314 /*
3315  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3316  * Caller must free buffer.
3317  */
3318 int
3319 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3320                            struct kvec *iov, unsigned int minbufsize,
3321                            char *data)
3322 {
3323         char *begin_of_buf = offset + (char *)iov->iov_base;
3324         int rc;
3325
3326         if (!data)
3327                 return -EINVAL;
3328
3329         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3330         if (rc)
3331                 return rc;
3332
3333         memcpy(data, begin_of_buf, buffer_length);
3334
3335         return 0;
3336 }
3337
3338 int
3339 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3340                      struct smb_rqst *rqst,
3341                      u64 persistent_fid, u64 volatile_fid,
3342                      u8 info_class, u8 info_type, u32 additional_info,
3343                      size_t output_len, size_t input_len, void *input)
3344 {
3345         struct smb2_query_info_req *req;
3346         struct kvec *iov = rqst->rq_iov;
3347         unsigned int total_len;
3348         int rc;
3349
3350         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3351                                  (void **) &req, &total_len);
3352         if (rc)
3353                 return rc;
3354
3355         req->InfoType = info_type;
3356         req->FileInfoClass = info_class;
3357         req->PersistentFileId = persistent_fid;
3358         req->VolatileFileId = volatile_fid;
3359         req->AdditionalInformation = cpu_to_le32(additional_info);
3360
3361         req->OutputBufferLength = cpu_to_le32(output_len);
3362         if (input_len) {
3363                 req->InputBufferLength = cpu_to_le32(input_len);
3364                 /* total_len for smb query request never close to le16 max */
3365                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3366                 memcpy(req->Buffer, input, input_len);
3367         }
3368
3369         iov[0].iov_base = (char *)req;
3370         /* 1 for Buffer */
3371         iov[0].iov_len = total_len - 1 + input_len;
3372         return 0;
3373 }
3374
3375 void
3376 SMB2_query_info_free(struct smb_rqst *rqst)
3377 {
3378         if (rqst && rqst->rq_iov)
3379                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3380 }
3381
3382 static int
3383 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3384            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3385            u32 additional_info, size_t output_len, size_t min_len, void **data,
3386                 u32 *dlen)
3387 {
3388         struct smb_rqst rqst;
3389         struct smb2_query_info_rsp *rsp = NULL;
3390         struct kvec iov[1];
3391         struct kvec rsp_iov;
3392         int rc = 0;
3393         int resp_buftype = CIFS_NO_BUFFER;
3394         struct cifs_ses *ses = tcon->ses;
3395         struct TCP_Server_Info *server;
3396         int flags = 0;
3397         bool allocated = false;
3398
3399         cifs_dbg(FYI, "Query Info\n");
3400
3401         if (!ses)
3402                 return -EIO;
3403         server = cifs_pick_channel(ses);
3404         if (!server)
3405                 return -EIO;
3406
3407         if (smb3_encryption_required(tcon))
3408                 flags |= CIFS_TRANSFORM_REQ;
3409
3410         memset(&rqst, 0, sizeof(struct smb_rqst));
3411         memset(&iov, 0, sizeof(iov));
3412         rqst.rq_iov = iov;
3413         rqst.rq_nvec = 1;
3414
3415         rc = SMB2_query_info_init(tcon, server,
3416                                   &rqst, persistent_fid, volatile_fid,
3417                                   info_class, info_type, additional_info,
3418                                   output_len, 0, NULL);
3419         if (rc)
3420                 goto qinf_exit;
3421
3422         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3423                                     ses->Suid, info_class, (__u32)info_type);
3424
3425         rc = cifs_send_recv(xid, ses, server,
3426                             &rqst, &resp_buftype, flags, &rsp_iov);
3427         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3428
3429         if (rc) {
3430                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3431                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3432                                 ses->Suid, info_class, (__u32)info_type, rc);
3433                 goto qinf_exit;
3434         }
3435
3436         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3437                                 ses->Suid, info_class, (__u32)info_type);
3438
3439         if (dlen) {
3440                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3441                 if (!*data) {
3442                         *data = kmalloc(*dlen, GFP_KERNEL);
3443                         if (!*data) {
3444                                 cifs_tcon_dbg(VFS,
3445                                         "Error %d allocating memory for acl\n",
3446                                         rc);
3447                                 *dlen = 0;
3448                                 rc = -ENOMEM;
3449                                 goto qinf_exit;
3450                         }
3451                         allocated = true;
3452                 }
3453         }
3454
3455         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3456                                         le32_to_cpu(rsp->OutputBufferLength),
3457                                         &rsp_iov, min_len, *data);
3458         if (rc && allocated) {
3459                 kfree(*data);
3460                 *data = NULL;
3461                 *dlen = 0;
3462         }
3463
3464 qinf_exit:
3465         SMB2_query_info_free(&rqst);
3466         free_rsp_buf(resp_buftype, rsp);
3467         return rc;
3468 }
3469
3470 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3471         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3472 {
3473         return query_info(xid, tcon, persistent_fid, volatile_fid,
3474                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3475                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3476                           sizeof(struct smb2_file_all_info), (void **)&data,
3477                           NULL);
3478 }
3479
3480 int
3481 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3482                 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3483 {
3484         size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3485                         (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3486         *plen = 0;
3487
3488         return query_info(xid, tcon, persistent_fid, volatile_fid,
3489                           SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3490                           output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3491 }
3492
3493 int
3494 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3495                u64 persistent_fid, u64 volatile_fid,
3496                void **data, u32 *plen, u32 extra_info)
3497 {
3498         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO |
3499                                 extra_info;
3500         *plen = 0;
3501
3502         return query_info(xid, tcon, persistent_fid, volatile_fid,
3503                           0, SMB2_O_INFO_SECURITY, additional_info,
3504                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3505 }
3506
3507 int
3508 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3509                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3510 {
3511         return query_info(xid, tcon, persistent_fid, volatile_fid,
3512                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3513                           sizeof(struct smb2_file_internal_info),
3514                           sizeof(struct smb2_file_internal_info),
3515                           (void **)&uniqueid, NULL);
3516 }
3517
3518 /*
3519  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3520  * See MS-SMB2 2.2.35 and 2.2.36
3521  */
3522
3523 static int
3524 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3525                  struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3526                  u64 persistent_fid, u64 volatile_fid,
3527                  u32 completion_filter, bool watch_tree)
3528 {
3529         struct smb2_change_notify_req *req;
3530         struct kvec *iov = rqst->rq_iov;
3531         unsigned int total_len;
3532         int rc;
3533
3534         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3535                                  (void **) &req, &total_len);
3536         if (rc)
3537                 return rc;
3538
3539         req->PersistentFileId = persistent_fid;
3540         req->VolatileFileId = volatile_fid;
3541         /* See note 354 of MS-SMB2, 64K max */
3542         req->OutputBufferLength =
3543                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3544         req->CompletionFilter = cpu_to_le32(completion_filter);
3545         if (watch_tree)
3546                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3547         else
3548                 req->Flags = 0;
3549
3550         iov[0].iov_base = (char *)req;
3551         iov[0].iov_len = total_len;
3552
3553         return 0;
3554 }
3555
3556 int
3557 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3558                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3559                 u32 completion_filter)
3560 {
3561         struct cifs_ses *ses = tcon->ses;
3562         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3563         struct smb_rqst rqst;
3564         struct kvec iov[1];
3565         struct kvec rsp_iov = {NULL, 0};
3566         int resp_buftype = CIFS_NO_BUFFER;
3567         int flags = 0;
3568         int rc = 0;
3569
3570         cifs_dbg(FYI, "change notify\n");
3571         if (!ses || !server)
3572                 return -EIO;
3573
3574         if (smb3_encryption_required(tcon))
3575                 flags |= CIFS_TRANSFORM_REQ;
3576
3577         memset(&rqst, 0, sizeof(struct smb_rqst));
3578         memset(&iov, 0, sizeof(iov));
3579         rqst.rq_iov = iov;
3580         rqst.rq_nvec = 1;
3581
3582         rc = SMB2_notify_init(xid, &rqst, tcon, server,
3583                               persistent_fid, volatile_fid,
3584                               completion_filter, watch_tree);
3585         if (rc)
3586                 goto cnotify_exit;
3587
3588         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3589                                 (u8)watch_tree, completion_filter);
3590         rc = cifs_send_recv(xid, ses, server,
3591                             &rqst, &resp_buftype, flags, &rsp_iov);
3592
3593         if (rc != 0) {
3594                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3595                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3596                                 (u8)watch_tree, completion_filter, rc);
3597         } else
3598                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3599                                 ses->Suid, (u8)watch_tree, completion_filter);
3600
3601  cnotify_exit:
3602         if (rqst.rq_iov)
3603                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3604         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3605         return rc;
3606 }
3607
3608
3609
3610 /*
3611  * This is a no-op for now. We're not really interested in the reply, but
3612  * rather in the fact that the server sent one and that server->lstrp
3613  * gets updated.
3614  *
3615  * FIXME: maybe we should consider checking that the reply matches request?
3616  */
3617 static void
3618 smb2_echo_callback(struct mid_q_entry *mid)
3619 {
3620         struct TCP_Server_Info *server = mid->callback_data;
3621         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3622         struct cifs_credits credits = { .value = 0, .instance = 0 };
3623
3624         if (mid->mid_state == MID_RESPONSE_RECEIVED
3625             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3626                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3627                 credits.instance = server->reconnect_instance;
3628         }
3629
3630         DeleteMidQEntry(mid);
3631         add_credits(server, &credits, CIFS_ECHO_OP);
3632 }
3633
3634 void smb2_reconnect_server(struct work_struct *work)
3635 {
3636         struct TCP_Server_Info *server = container_of(work,
3637                                         struct TCP_Server_Info, reconnect.work);
3638         struct cifs_ses *ses;
3639         struct cifs_tcon *tcon, *tcon2;
3640         struct list_head tmp_list;
3641         int tcon_exist = false;
3642         int rc;
3643         int resched = false;
3644
3645
3646         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3647         mutex_lock(&server->reconnect_mutex);
3648
3649         INIT_LIST_HEAD(&tmp_list);
3650         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
3651
3652         spin_lock(&cifs_tcp_ses_lock);
3653         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
3654                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3655                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3656                                 tcon->tc_count++;
3657                                 list_add_tail(&tcon->rlist, &tmp_list);
3658                                 tcon_exist = true;
3659                         }
3660                 }
3661                 /*
3662                  * IPC has the same lifetime as its session and uses its
3663                  * refcount.
3664                  */
3665                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3666                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3667                         tcon_exist = true;
3668                         ses->ses_count++;
3669                 }
3670         }
3671         /*
3672          * Get the reference to server struct to be sure that the last call of
3673          * cifs_put_tcon() in the loop below won't release the server pointer.
3674          */
3675         if (tcon_exist)
3676                 server->srv_count++;
3677
3678         spin_unlock(&cifs_tcp_ses_lock);
3679
3680         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3681                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3682                 if (!rc)
3683                         cifs_reopen_persistent_handles(tcon);
3684                 else
3685                         resched = true;
3686                 list_del_init(&tcon->rlist);
3687                 if (tcon->ipc)
3688                         cifs_put_smb_ses(tcon->ses);
3689                 else
3690                         cifs_put_tcon(tcon);
3691         }
3692
3693         cifs_dbg(FYI, "Reconnecting tcons finished\n");
3694         if (resched)
3695                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3696         mutex_unlock(&server->reconnect_mutex);
3697
3698         /* now we can safely release srv struct */
3699         if (tcon_exist)
3700                 cifs_put_tcp_session(server, 1);
3701 }
3702
3703 int
3704 SMB2_echo(struct TCP_Server_Info *server)
3705 {
3706         struct smb2_echo_req *req;
3707         int rc = 0;
3708         struct kvec iov[1];
3709         struct smb_rqst rqst = { .rq_iov = iov,
3710                                  .rq_nvec = 1 };
3711         unsigned int total_len;
3712
3713         cifs_dbg(FYI, "In echo request\n");
3714
3715         if (server->tcpStatus == CifsNeedNegotiate) {
3716                 /* No need to send echo on newly established connections */
3717                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
3718                 return rc;
3719         }
3720
3721         rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
3722                                  (void **)&req, &total_len);
3723         if (rc)
3724                 return rc;
3725
3726         req->sync_hdr.CreditRequest = cpu_to_le16(1);
3727
3728         iov[0].iov_len = total_len;
3729         iov[0].iov_base = (char *)req;
3730
3731         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3732                              server, CIFS_ECHO_OP, NULL);
3733         if (rc)
3734                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3735
3736         cifs_small_buf_release(req);
3737         return rc;
3738 }
3739
3740 void
3741 SMB2_flush_free(struct smb_rqst *rqst)
3742 {
3743         if (rqst && rqst->rq_iov)
3744                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3745 }
3746
3747 int
3748 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3749                 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3750                 u64 persistent_fid, u64 volatile_fid)
3751 {
3752         struct smb2_flush_req *req;
3753         struct kvec *iov = rqst->rq_iov;
3754         unsigned int total_len;
3755         int rc;
3756
3757         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
3758                                  (void **) &req, &total_len);
3759         if (rc)
3760                 return rc;
3761
3762         req->PersistentFileId = persistent_fid;
3763         req->VolatileFileId = volatile_fid;
3764
3765         iov[0].iov_base = (char *)req;
3766         iov[0].iov_len = total_len;
3767
3768         return 0;
3769 }
3770
3771 int
3772 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3773            u64 volatile_fid)
3774 {
3775         struct cifs_ses *ses = tcon->ses;
3776         struct smb_rqst rqst;
3777         struct kvec iov[1];
3778         struct kvec rsp_iov = {NULL, 0};
3779         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3780         int resp_buftype = CIFS_NO_BUFFER;
3781         int flags = 0;
3782         int rc = 0;
3783
3784         cifs_dbg(FYI, "flush\n");
3785         if (!ses || !(ses->server))
3786                 return -EIO;
3787
3788         if (smb3_encryption_required(tcon))
3789                 flags |= CIFS_TRANSFORM_REQ;
3790
3791         memset(&rqst, 0, sizeof(struct smb_rqst));
3792         memset(&iov, 0, sizeof(iov));
3793         rqst.rq_iov = iov;
3794         rqst.rq_nvec = 1;
3795
3796         rc = SMB2_flush_init(xid, &rqst, tcon, server,
3797                              persistent_fid, volatile_fid);
3798         if (rc)
3799                 goto flush_exit;
3800
3801         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3802         rc = cifs_send_recv(xid, ses, server,
3803                             &rqst, &resp_buftype, flags, &rsp_iov);
3804
3805         if (rc != 0) {
3806                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3807                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3808                                      rc);
3809         } else
3810                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
3811                                       ses->Suid);
3812
3813  flush_exit:
3814         SMB2_flush_free(&rqst);
3815         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3816         return rc;
3817 }
3818
3819 /*
3820  * To form a chain of read requests, any read requests after the first should
3821  * have the end_of_chain boolean set to true.
3822  */
3823 static int
3824 smb2_new_read_req(void **buf, unsigned int *total_len,
3825         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3826         unsigned int remaining_bytes, int request_type)
3827 {
3828         int rc = -EACCES;
3829         struct smb2_read_plain_req *req = NULL;
3830         struct smb2_sync_hdr *shdr;
3831         struct TCP_Server_Info *server = io_parms->server;
3832
3833         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
3834                                  (void **) &req, total_len);
3835         if (rc)
3836                 return rc;
3837
3838         if (server == NULL)
3839                 return -ECONNABORTED;
3840
3841         shdr = &req->sync_hdr;
3842         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3843
3844         req->PersistentFileId = io_parms->persistent_fid;
3845         req->VolatileFileId = io_parms->volatile_fid;
3846         req->ReadChannelInfoOffset = 0; /* reserved */
3847         req->ReadChannelInfoLength = 0; /* reserved */
3848         req->Channel = 0; /* reserved */
3849         req->MinimumCount = 0;
3850         req->Length = cpu_to_le32(io_parms->length);
3851         req->Offset = cpu_to_le64(io_parms->offset);
3852
3853         trace_smb3_read_enter(0 /* xid */,
3854                         io_parms->persistent_fid,
3855                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
3856                         io_parms->offset, io_parms->length);
3857 #ifdef CONFIG_CIFS_SMB_DIRECT
3858         /*
3859          * If we want to do a RDMA write, fill in and append
3860          * smbd_buffer_descriptor_v1 to the end of read request
3861          */
3862         if (server->rdma && rdata && !server->sign &&
3863                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3864
3865                 struct smbd_buffer_descriptor_v1 *v1;
3866                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3867
3868                 rdata->mr = smbd_register_mr(
3869                                 server->smbd_conn, rdata->pages,
3870                                 rdata->nr_pages, rdata->page_offset,
3871                                 rdata->tailsz, true, need_invalidate);
3872                 if (!rdata->mr)
3873                         return -EAGAIN;
3874
3875                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3876                 if (need_invalidate)
3877                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3878                 req->ReadChannelInfoOffset =
3879                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3880                 req->ReadChannelInfoLength =
3881                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3882                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3883                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3884                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3885                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3886
3887                 *total_len += sizeof(*v1) - 1;
3888         }
3889 #endif
3890         if (request_type & CHAINED_REQUEST) {
3891                 if (!(request_type & END_OF_CHAIN)) {
3892                         /* next 8-byte aligned request */
3893                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3894                         shdr->NextCommand = cpu_to_le32(*total_len);
3895                 } else /* END_OF_CHAIN */
3896                         shdr->NextCommand = 0;
3897                 if (request_type & RELATED_REQUEST) {
3898                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3899                         /*
3900                          * Related requests use info from previous read request
3901                          * in chain.
3902                          */
3903                         shdr->SessionId = 0xFFFFFFFF;
3904                         shdr->TreeId = 0xFFFFFFFF;
3905                         req->PersistentFileId = 0xFFFFFFFF;
3906                         req->VolatileFileId = 0xFFFFFFFF;
3907                 }
3908         }
3909         if (remaining_bytes > io_parms->length)
3910                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3911         else
3912                 req->RemainingBytes = 0;
3913
3914         *buf = req;
3915         return rc;
3916 }
3917
3918 static void
3919 smb2_readv_callback(struct mid_q_entry *mid)
3920 {
3921         struct cifs_readdata *rdata = mid->callback_data;
3922         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3923         struct TCP_Server_Info *server = rdata->server;
3924         struct smb2_sync_hdr *shdr =
3925                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3926         struct cifs_credits credits = { .value = 0, .instance = 0 };
3927         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
3928                                  .rq_nvec = 1,
3929                                  .rq_pages = rdata->pages,
3930                                  .rq_offset = rdata->page_offset,
3931                                  .rq_npages = rdata->nr_pages,
3932                                  .rq_pagesz = rdata->pagesz,
3933                                  .rq_tailsz = rdata->tailsz };
3934
3935         WARN_ONCE(rdata->server != mid->server,
3936                   "rdata server %p != mid server %p",
3937                   rdata->server, mid->server);
3938
3939         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3940                  __func__, mid->mid, mid->mid_state, rdata->result,
3941                  rdata->bytes);
3942
3943         switch (mid->mid_state) {
3944         case MID_RESPONSE_RECEIVED:
3945                 credits.value = le16_to_cpu(shdr->CreditRequest);
3946                 credits.instance = server->reconnect_instance;
3947                 /* result already set, check signature */
3948                 if (server->sign && !mid->decrypted) {
3949                         int rc;
3950
3951                         rc = smb2_verify_signature(&rqst, server);
3952                         if (rc)
3953                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
3954                                          rc);
3955                 }
3956                 /* FIXME: should this be counted toward the initiating task? */
3957                 task_io_account_read(rdata->got_bytes);
3958                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3959                 break;
3960         case MID_REQUEST_SUBMITTED:
3961         case MID_RETRY_NEEDED:
3962                 rdata->result = -EAGAIN;
3963                 if (server->sign && rdata->got_bytes)
3964                         /* reset bytes number since we can not check a sign */
3965                         rdata->got_bytes = 0;
3966                 /* FIXME: should this be counted toward the initiating task? */
3967                 task_io_account_read(rdata->got_bytes);
3968                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3969                 break;
3970         case MID_RESPONSE_MALFORMED:
3971                 credits.value = le16_to_cpu(shdr->CreditRequest);
3972                 credits.instance = server->reconnect_instance;
3973                 fallthrough;
3974         default:
3975                 rdata->result = -EIO;
3976         }
3977 #ifdef CONFIG_CIFS_SMB_DIRECT
3978         /*
3979          * If this rdata has a memmory registered, the MR can be freed
3980          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3981          * because they have limited number and are used for future I/Os
3982          */
3983         if (rdata->mr) {
3984                 smbd_deregister_mr(rdata->mr);
3985                 rdata->mr = NULL;
3986         }
3987 #endif
3988         if (rdata->result && rdata->result != -ENODATA) {
3989                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3990                 trace_smb3_read_err(0 /* xid */,
3991                                     rdata->cfile->fid.persistent_fid,
3992                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3993                                     rdata->bytes, rdata->result);
3994         } else
3995                 trace_smb3_read_done(0 /* xid */,
3996                                      rdata->cfile->fid.persistent_fid,
3997                                      tcon->tid, tcon->ses->Suid,
3998                                      rdata->offset, rdata->got_bytes);
3999
4000         queue_work(cifsiod_wq, &rdata->work);
4001         DeleteMidQEntry(mid);
4002         add_credits(server, &credits, 0);
4003 }
4004
4005 /* smb2_async_readv - send an async read, and set up mid to handle result */
4006 int
4007 smb2_async_readv(struct cifs_readdata *rdata)
4008 {
4009         int rc, flags = 0;
4010         char *buf;
4011         struct smb2_sync_hdr *shdr;
4012         struct cifs_io_parms io_parms;
4013         struct smb_rqst rqst = { .rq_iov = rdata->iov,
4014                                  .rq_nvec = 1 };
4015         struct TCP_Server_Info *server;
4016         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4017         unsigned int total_len;
4018
4019         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
4020                  __func__, rdata->offset, rdata->bytes);
4021
4022         if (!rdata->server)
4023                 rdata->server = cifs_pick_channel(tcon->ses);
4024
4025         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
4026         io_parms.server = server = rdata->server;
4027         io_parms.offset = rdata->offset;
4028         io_parms.length = rdata->bytes;
4029         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
4030         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
4031         io_parms.pid = rdata->pid;
4032
4033         rc = smb2_new_read_req(
4034                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4035         if (rc)
4036                 return rc;
4037
4038         if (smb3_encryption_required(io_parms.tcon))
4039                 flags |= CIFS_TRANSFORM_REQ;
4040
4041         rdata->iov[0].iov_base = buf;
4042         rdata->iov[0].iov_len = total_len;
4043
4044         shdr = (struct smb2_sync_hdr *)buf;
4045
4046         if (rdata->credits.value > 0) {
4047                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
4048                                                 SMB2_MAX_BUFFER_SIZE));
4049                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4050
4051                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
4052                 if (rc)
4053                         goto async_readv_out;
4054
4055                 flags |= CIFS_HAS_CREDITS;
4056         }
4057
4058         kref_get(&rdata->refcount);
4059         rc = cifs_call_async(server, &rqst,
4060                              cifs_readv_receive, smb2_readv_callback,
4061                              smb3_handle_read_data, rdata, flags,
4062                              &rdata->credits);
4063         if (rc) {
4064                 kref_put(&rdata->refcount, cifs_readdata_release);
4065                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4066                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4067                                     io_parms.tcon->tid,
4068                                     io_parms.tcon->ses->Suid,
4069                                     io_parms.offset, io_parms.length, rc);
4070         }
4071
4072 async_readv_out:
4073         cifs_small_buf_release(buf);
4074         return rc;
4075 }
4076
4077 int
4078 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4079           unsigned int *nbytes, char **buf, int *buf_type)
4080 {
4081         struct smb_rqst rqst;
4082         int resp_buftype, rc;
4083         struct smb2_read_plain_req *req = NULL;
4084         struct smb2_read_rsp *rsp = NULL;
4085         struct kvec iov[1];
4086         struct kvec rsp_iov;
4087         unsigned int total_len;
4088         int flags = CIFS_LOG_ERROR;
4089         struct cifs_ses *ses = io_parms->tcon->ses;
4090
4091         if (!io_parms->server)
4092                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4093
4094         *nbytes = 0;
4095         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4096         if (rc)
4097                 return rc;
4098
4099         if (smb3_encryption_required(io_parms->tcon))
4100                 flags |= CIFS_TRANSFORM_REQ;
4101
4102         iov[0].iov_base = (char *)req;
4103         iov[0].iov_len = total_len;
4104
4105         memset(&rqst, 0, sizeof(struct smb_rqst));
4106         rqst.rq_iov = iov;
4107         rqst.rq_nvec = 1;
4108
4109         rc = cifs_send_recv(xid, ses, io_parms->server,
4110                             &rqst, &resp_buftype, flags, &rsp_iov);
4111         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4112
4113         if (rc) {
4114                 if (rc != -ENODATA) {
4115                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4116                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
4117                         trace_smb3_read_err(xid, req->PersistentFileId,
4118                                             io_parms->tcon->tid, ses->Suid,
4119                                             io_parms->offset, io_parms->length,
4120                                             rc);
4121                 } else
4122                         trace_smb3_read_done(xid, req->PersistentFileId,
4123                                     io_parms->tcon->tid, ses->Suid,
4124                                     io_parms->offset, 0);
4125                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4126                 cifs_small_buf_release(req);
4127                 return rc == -ENODATA ? 0 : rc;
4128         } else
4129                 trace_smb3_read_done(xid, req->PersistentFileId,
4130                                     io_parms->tcon->tid, ses->Suid,
4131                                     io_parms->offset, io_parms->length);
4132
4133         cifs_small_buf_release(req);
4134
4135         *nbytes = le32_to_cpu(rsp->DataLength);
4136         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4137             (*nbytes > io_parms->length)) {
4138                 cifs_dbg(FYI, "bad length %d for count %d\n",
4139                          *nbytes, io_parms->length);
4140                 rc = -EIO;
4141                 *nbytes = 0;
4142         }
4143
4144         if (*buf) {
4145                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4146                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4147         } else if (resp_buftype != CIFS_NO_BUFFER) {
4148                 *buf = rsp_iov.iov_base;
4149                 if (resp_buftype == CIFS_SMALL_BUFFER)
4150                         *buf_type = CIFS_SMALL_BUFFER;
4151                 else if (resp_buftype == CIFS_LARGE_BUFFER)
4152                         *buf_type = CIFS_LARGE_BUFFER;
4153         }
4154         return rc;
4155 }
4156
4157 /*
4158  * Check the mid_state and signature on received buffer (if any), and queue the
4159  * workqueue completion task.
4160  */
4161 static void
4162 smb2_writev_callback(struct mid_q_entry *mid)
4163 {
4164         struct cifs_writedata *wdata = mid->callback_data;
4165         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4166         struct TCP_Server_Info *server = wdata->server;
4167         unsigned int written;
4168         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4169         struct cifs_credits credits = { .value = 0, .instance = 0 };
4170
4171         WARN_ONCE(wdata->server != mid->server,
4172                   "wdata server %p != mid server %p",
4173                   wdata->server, mid->server);
4174
4175         switch (mid->mid_state) {
4176         case MID_RESPONSE_RECEIVED:
4177                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4178                 credits.instance = server->reconnect_instance;
4179                 wdata->result = smb2_check_receive(mid, server, 0);
4180                 if (wdata->result != 0)
4181                         break;
4182
4183                 written = le32_to_cpu(rsp->DataLength);
4184                 /*
4185                  * Mask off high 16 bits when bytes written as returned
4186                  * by the server is greater than bytes requested by the
4187                  * client. OS/2 servers are known to set incorrect
4188                  * CountHigh values.
4189                  */
4190                 if (written > wdata->bytes)
4191                         written &= 0xFFFF;
4192
4193                 if (written < wdata->bytes)
4194                         wdata->result = -ENOSPC;
4195                 else
4196                         wdata->bytes = written;
4197                 break;
4198         case MID_REQUEST_SUBMITTED:
4199         case MID_RETRY_NEEDED:
4200                 wdata->result = -EAGAIN;
4201                 break;
4202         case MID_RESPONSE_MALFORMED:
4203                 credits.value = le16_to_cpu(rsp->sync_hdr.CreditRequest);
4204                 credits.instance = server->reconnect_instance;
4205                 fallthrough;
4206         default:
4207                 wdata->result = -EIO;
4208                 break;
4209         }
4210 #ifdef CONFIG_CIFS_SMB_DIRECT
4211         /*
4212          * If this wdata has a memory registered, the MR can be freed
4213          * The number of MRs available is limited, it's important to recover
4214          * used MR as soon as I/O is finished. Hold MR longer in the later
4215          * I/O process can possibly result in I/O deadlock due to lack of MR
4216          * to send request on I/O retry
4217          */
4218         if (wdata->mr) {
4219                 smbd_deregister_mr(wdata->mr);
4220                 wdata->mr = NULL;
4221         }
4222 #endif
4223         if (wdata->result) {
4224                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4225                 trace_smb3_write_err(0 /* no xid */,
4226                                      wdata->cfile->fid.persistent_fid,
4227                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4228                                      wdata->bytes, wdata->result);
4229                 if (wdata->result == -ENOSPC)
4230                         pr_warn_once("Out of space writing to %s\n",
4231                                      tcon->treeName);
4232         } else
4233                 trace_smb3_write_done(0 /* no xid */,
4234                                       wdata->cfile->fid.persistent_fid,
4235                                       tcon->tid, tcon->ses->Suid,
4236                                       wdata->offset, wdata->bytes);
4237
4238         queue_work(cifsiod_wq, &wdata->work);
4239         DeleteMidQEntry(mid);
4240         add_credits(server, &credits, 0);
4241 }
4242
4243 /* smb2_async_writev - send an async write, and set up mid to handle result */
4244 int
4245 smb2_async_writev(struct cifs_writedata *wdata,
4246                   void (*release)(struct kref *kref))
4247 {
4248         int rc = -EACCES, flags = 0;
4249         struct smb2_write_req *req = NULL;
4250         struct smb2_sync_hdr *shdr;
4251         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4252         struct TCP_Server_Info *server = wdata->server;
4253         struct kvec iov[1];
4254         struct smb_rqst rqst = { };
4255         unsigned int total_len;
4256
4257         if (!wdata->server)
4258                 server = wdata->server = cifs_pick_channel(tcon->ses);
4259
4260         rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4261                                  (void **) &req, &total_len);
4262         if (rc)
4263                 return rc;
4264
4265         if (smb3_encryption_required(tcon))
4266                 flags |= CIFS_TRANSFORM_REQ;
4267
4268         shdr = (struct smb2_sync_hdr *)req;
4269         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
4270
4271         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
4272         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
4273         req->WriteChannelInfoOffset = 0;
4274         req->WriteChannelInfoLength = 0;
4275         req->Channel = 0;
4276         req->Offset = cpu_to_le64(wdata->offset);
4277         req->DataOffset = cpu_to_le16(
4278                                 offsetof(struct smb2_write_req, Buffer));
4279         req->RemainingBytes = 0;
4280
4281         trace_smb3_write_enter(0 /* xid */, wdata->cfile->fid.persistent_fid,
4282                 tcon->tid, tcon->ses->Suid, wdata->offset, wdata->bytes);
4283 #ifdef CONFIG_CIFS_SMB_DIRECT
4284         /*
4285          * If we want to do a server RDMA read, fill in and append
4286          * smbd_buffer_descriptor_v1 to the end of write request
4287          */
4288         if (server->rdma && !server->sign && wdata->bytes >=
4289                 server->smbd_conn->rdma_readwrite_threshold) {
4290
4291                 struct smbd_buffer_descriptor_v1 *v1;
4292                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4293
4294                 wdata->mr = smbd_register_mr(
4295                                 server->smbd_conn, wdata->pages,
4296                                 wdata->nr_pages, wdata->page_offset,
4297                                 wdata->tailsz, false, need_invalidate);
4298                 if (!wdata->mr) {
4299                         rc = -EAGAIN;
4300                         goto async_writev_out;
4301                 }
4302                 req->Length = 0;
4303                 req->DataOffset = 0;
4304                 if (wdata->nr_pages > 1)
4305                         req->RemainingBytes =
4306                                 cpu_to_le32(
4307                                         (wdata->nr_pages - 1) * wdata->pagesz -
4308                                         wdata->page_offset + wdata->tailsz
4309                                 );
4310                 else
4311                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
4312                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4313                 if (need_invalidate)
4314                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4315                 req->WriteChannelInfoOffset =
4316                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4317                 req->WriteChannelInfoLength =
4318                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4319                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4320                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4321                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4322                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4323         }
4324 #endif
4325         iov[0].iov_len = total_len - 1;
4326         iov[0].iov_base = (char *)req;
4327
4328         rqst.rq_iov = iov;
4329         rqst.rq_nvec = 1;
4330         rqst.rq_pages = wdata->pages;
4331         rqst.rq_offset = wdata->page_offset;
4332         rqst.rq_npages = wdata->nr_pages;
4333         rqst.rq_pagesz = wdata->pagesz;
4334         rqst.rq_tailsz = wdata->tailsz;
4335 #ifdef CONFIG_CIFS_SMB_DIRECT
4336         if (wdata->mr) {
4337                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4338                 rqst.rq_npages = 0;
4339         }
4340 #endif
4341         cifs_dbg(FYI, "async write at %llu %u bytes\n",
4342                  wdata->offset, wdata->bytes);
4343
4344 #ifdef CONFIG_CIFS_SMB_DIRECT
4345         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4346         if (!wdata->mr)
4347                 req->Length = cpu_to_le32(wdata->bytes);
4348 #else
4349         req->Length = cpu_to_le32(wdata->bytes);
4350 #endif
4351
4352         if (wdata->credits.value > 0) {
4353                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4354                                                     SMB2_MAX_BUFFER_SIZE));
4355                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4356
4357                 rc = adjust_credits(server, &wdata->credits, wdata->bytes);
4358                 if (rc)
4359                         goto async_writev_out;
4360
4361                 flags |= CIFS_HAS_CREDITS;
4362         }
4363
4364         kref_get(&wdata->refcount);
4365         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4366                              wdata, flags, &wdata->credits);
4367
4368         if (rc) {
4369                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
4370                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4371                                      wdata->bytes, rc);
4372                 kref_put(&wdata->refcount, release);
4373                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4374         }
4375
4376 async_writev_out:
4377         cifs_small_buf_release(req);
4378         return rc;
4379 }
4380
4381 /*
4382  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4383  * The length field from io_parms must be at least 1 and indicates a number of
4384  * elements with data to write that begins with position 1 in iov array. All
4385  * data length is specified by count.
4386  */
4387 int
4388 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4389            unsigned int *nbytes, struct kvec *iov, int n_vec)
4390 {
4391         struct smb_rqst rqst;
4392         int rc = 0;
4393         struct smb2_write_req *req = NULL;
4394         struct smb2_write_rsp *rsp = NULL;
4395         int resp_buftype;
4396         struct kvec rsp_iov;
4397         int flags = 0;
4398         unsigned int total_len;
4399         struct TCP_Server_Info *server;
4400
4401         *nbytes = 0;
4402
4403         if (n_vec < 1)
4404                 return rc;
4405
4406         if (!io_parms->server)
4407                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4408         server = io_parms->server;
4409         if (server == NULL)
4410                 return -ECONNABORTED;
4411
4412         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
4413                                  (void **) &req, &total_len);
4414         if (rc)
4415                 return rc;
4416
4417         if (smb3_encryption_required(io_parms->tcon))
4418                 flags |= CIFS_TRANSFORM_REQ;
4419
4420         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
4421
4422         req->PersistentFileId = io_parms->persistent_fid;
4423         req->VolatileFileId = io_parms->volatile_fid;
4424         req->WriteChannelInfoOffset = 0;
4425         req->WriteChannelInfoLength = 0;
4426         req->Channel = 0;
4427         req->Length = cpu_to_le32(io_parms->length);
4428         req->Offset = cpu_to_le64(io_parms->offset);
4429         req->DataOffset = cpu_to_le16(
4430                                 offsetof(struct smb2_write_req, Buffer));
4431         req->RemainingBytes = 0;
4432
4433         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4434                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4435                 io_parms->offset, io_parms->length);
4436
4437         iov[0].iov_base = (char *)req;
4438         /* 1 for Buffer */
4439         iov[0].iov_len = total_len - 1;
4440
4441         memset(&rqst, 0, sizeof(struct smb_rqst));
4442         rqst.rq_iov = iov;
4443         rqst.rq_nvec = n_vec + 1;
4444
4445         rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
4446                             &rqst,
4447                             &resp_buftype, flags, &rsp_iov);
4448         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4449
4450         if (rc) {
4451                 trace_smb3_write_err(xid, req->PersistentFileId,
4452                                      io_parms->tcon->tid,
4453                                      io_parms->tcon->ses->Suid,
4454                                      io_parms->offset, io_parms->length, rc);
4455                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4456                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4457         } else {
4458                 *nbytes = le32_to_cpu(rsp->DataLength);
4459                 trace_smb3_write_done(xid, req->PersistentFileId,
4460                                      io_parms->tcon->tid,
4461                                      io_parms->tcon->ses->Suid,
4462                                      io_parms->offset, *nbytes);
4463         }
4464
4465         cifs_small_buf_release(req);
4466         free_rsp_buf(resp_buftype, rsp);
4467         return rc;
4468 }
4469
4470 int posix_info_sid_size(const void *beg, const void *end)
4471 {
4472         size_t subauth;
4473         int total;
4474
4475         if (beg + 1 > end)
4476                 return -1;
4477
4478         subauth = *(u8 *)(beg+1);
4479         if (subauth < 1 || subauth > 15)
4480                 return -1;
4481
4482         total = 1 + 1 + 6 + 4*subauth;
4483         if (beg + total > end)
4484                 return -1;
4485
4486         return total;
4487 }
4488
4489 int posix_info_parse(const void *beg, const void *end,
4490                      struct smb2_posix_info_parsed *out)
4491
4492 {
4493         int total_len = 0;
4494         int sid_len;
4495         int name_len;
4496         const void *owner_sid;
4497         const void *group_sid;
4498         const void *name;
4499
4500         /* if no end bound given, assume payload to be correct */
4501         if (!end) {
4502                 const struct smb2_posix_info *p = beg;
4503
4504                 end = beg + le32_to_cpu(p->NextEntryOffset);
4505                 /* last element will have a 0 offset, pick a sensible bound */
4506                 if (end == beg)
4507                         end += 0xFFFF;
4508         }
4509
4510         /* check base buf */
4511         if (beg + sizeof(struct smb2_posix_info) > end)
4512                 return -1;
4513         total_len = sizeof(struct smb2_posix_info);
4514
4515         /* check owner sid */
4516         owner_sid = beg + total_len;
4517         sid_len = posix_info_sid_size(owner_sid, end);
4518         if (sid_len < 0)
4519                 return -1;
4520         total_len += sid_len;
4521
4522         /* check group sid */
4523         group_sid = beg + total_len;
4524         sid_len = posix_info_sid_size(group_sid, end);
4525         if (sid_len < 0)
4526                 return -1;
4527         total_len += sid_len;
4528
4529         /* check name len */
4530         if (beg + total_len + 4 > end)
4531                 return -1;
4532         name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
4533         if (name_len < 1 || name_len > 0xFFFF)
4534                 return -1;
4535         total_len += 4;
4536
4537         /* check name */
4538         name = beg + total_len;
4539         if (name + name_len > end)
4540                 return -1;
4541         total_len += name_len;
4542
4543         if (out) {
4544                 out->base = beg;
4545                 out->size = total_len;
4546                 out->name_len = name_len;
4547                 out->name = name;
4548                 memcpy(&out->owner, owner_sid,
4549                        posix_info_sid_size(owner_sid, end));
4550                 memcpy(&out->group, group_sid,
4551                        posix_info_sid_size(group_sid, end));
4552         }
4553         return total_len;
4554 }
4555
4556 static int posix_info_extra_size(const void *beg, const void *end)
4557 {
4558         int len = posix_info_parse(beg, end, NULL);
4559
4560         if (len < 0)
4561                 return -1;
4562         return len - sizeof(struct smb2_posix_info);
4563 }
4564
4565 static unsigned int
4566 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
4567             size_t size)
4568 {
4569         int len;
4570         unsigned int entrycount = 0;
4571         unsigned int next_offset = 0;
4572         char *entryptr;
4573         FILE_DIRECTORY_INFO *dir_info;
4574
4575         if (bufstart == NULL)
4576                 return 0;
4577
4578         entryptr = bufstart;
4579
4580         while (1) {
4581                 if (entryptr + next_offset < entryptr ||
4582                     entryptr + next_offset > end_of_buf ||
4583                     entryptr + next_offset + size > end_of_buf) {
4584                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4585                         break;
4586                 }
4587
4588                 entryptr = entryptr + next_offset;
4589                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4590
4591                 if (infotype == SMB_FIND_FILE_POSIX_INFO)
4592                         len = posix_info_extra_size(entryptr, end_of_buf);
4593                 else
4594                         len = le32_to_cpu(dir_info->FileNameLength);
4595
4596                 if (len < 0 ||
4597                     entryptr + len < entryptr ||
4598                     entryptr + len > end_of_buf ||
4599                     entryptr + len + size > end_of_buf) {
4600                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4601                                  end_of_buf);
4602                         break;
4603                 }
4604
4605                 *lastentry = entryptr;
4606                 entrycount++;
4607
4608                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4609                 if (!next_offset)
4610                         break;
4611         }
4612
4613         return entrycount;
4614 }
4615
4616 /*
4617  * Readdir/FindFirst
4618  */
4619 int SMB2_query_directory_init(const unsigned int xid,
4620                               struct cifs_tcon *tcon,
4621                               struct TCP_Server_Info *server,
4622                               struct smb_rqst *rqst,
4623                               u64 persistent_fid, u64 volatile_fid,
4624                               int index, int info_level)
4625 {
4626         struct smb2_query_directory_req *req;
4627         unsigned char *bufptr;
4628         __le16 asteriks = cpu_to_le16('*');
4629         unsigned int output_size = CIFSMaxBufSize -
4630                 MAX_SMB2_CREATE_RESPONSE_SIZE -
4631                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
4632         unsigned int total_len;
4633         struct kvec *iov = rqst->rq_iov;
4634         int len, rc;
4635
4636         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
4637                                  (void **) &req, &total_len);
4638         if (rc)
4639                 return rc;
4640
4641         switch (info_level) {
4642         case SMB_FIND_FILE_DIRECTORY_INFO:
4643                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4644                 break;
4645         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4646                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4647                 break;
4648         case SMB_FIND_FILE_POSIX_INFO:
4649                 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
4650                 break;
4651         default:
4652                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4653                         info_level);
4654                 return -EINVAL;
4655         }
4656
4657         req->FileIndex = cpu_to_le32(index);
4658         req->PersistentFileId = persistent_fid;
4659         req->VolatileFileId = volatile_fid;
4660
4661         len = 0x2;
4662         bufptr = req->Buffer;
4663         memcpy(bufptr, &asteriks, len);
4664
4665         req->FileNameOffset =
4666                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
4667         req->FileNameLength = cpu_to_le16(len);
4668         /*
4669          * BB could be 30 bytes or so longer if we used SMB2 specific
4670          * buffer lengths, but this is safe and close enough.
4671          */
4672         output_size = min_t(unsigned int, output_size, server->maxBuf);
4673         output_size = min_t(unsigned int, output_size, 2 << 15);
4674         req->OutputBufferLength = cpu_to_le32(output_size);
4675
4676         iov[0].iov_base = (char *)req;
4677         /* 1 for Buffer */
4678         iov[0].iov_len = total_len - 1;
4679
4680         iov[1].iov_base = (char *)(req->Buffer);
4681         iov[1].iov_len = len;
4682
4683         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4684                         tcon->ses->Suid, index, output_size);
4685
4686         return 0;
4687 }
4688
4689 void SMB2_query_directory_free(struct smb_rqst *rqst)
4690 {
4691         if (rqst && rqst->rq_iov) {
4692                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4693         }
4694 }
4695
4696 int
4697 smb2_parse_query_directory(struct cifs_tcon *tcon,
4698                            struct kvec *rsp_iov,
4699                            int resp_buftype,
4700                            struct cifs_search_info *srch_inf)
4701 {
4702         struct smb2_query_directory_rsp *rsp;
4703         size_t info_buf_size;
4704         char *end_of_smb;
4705         int rc;
4706
4707         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4708
4709         switch (srch_inf->info_level) {
4710         case SMB_FIND_FILE_DIRECTORY_INFO:
4711                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
4712                 break;
4713         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4714                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
4715                 break;
4716         case SMB_FIND_FILE_POSIX_INFO:
4717                 /* note that posix payload are variable size */
4718                 info_buf_size = sizeof(struct smb2_posix_info);
4719                 break;
4720         default:
4721                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4722                          srch_inf->info_level);
4723                 return -EINVAL;
4724         }
4725
4726         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4727                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4728                                info_buf_size);
4729         if (rc) {
4730                 cifs_tcon_dbg(VFS, "bad info payload");
4731                 return rc;
4732         }
4733
4734         srch_inf->unicode = true;
4735
4736         if (srch_inf->ntwrk_buf_start) {
4737                 if (srch_inf->smallBuf)
4738                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4739                 else
4740                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4741         }
4742         srch_inf->ntwrk_buf_start = (char *)rsp;
4743         srch_inf->srch_entries_start = srch_inf->last_entry =
4744                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4745         end_of_smb = rsp_iov->iov_len + (char *)rsp;
4746
4747         srch_inf->entries_in_buffer = num_entries(
4748                 srch_inf->info_level,
4749                 srch_inf->srch_entries_start,
4750                 end_of_smb,
4751                 &srch_inf->last_entry,
4752                 info_buf_size);
4753
4754         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4755         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4756                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4757                  srch_inf->srch_entries_start, srch_inf->last_entry);
4758         if (resp_buftype == CIFS_LARGE_BUFFER)
4759                 srch_inf->smallBuf = false;
4760         else if (resp_buftype == CIFS_SMALL_BUFFER)
4761                 srch_inf->smallBuf = true;
4762         else
4763                 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
4764
4765         return 0;
4766 }
4767
4768 int
4769 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4770                      u64 persistent_fid, u64 volatile_fid, int index,
4771                      struct cifs_search_info *srch_inf)
4772 {
4773         struct smb_rqst rqst;
4774         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
4775         struct smb2_query_directory_rsp *rsp = NULL;
4776         int resp_buftype = CIFS_NO_BUFFER;
4777         struct kvec rsp_iov;
4778         int rc = 0;
4779         struct cifs_ses *ses = tcon->ses;
4780         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4781         int flags = 0;
4782
4783         if (!ses || !(ses->server))
4784                 return -EIO;
4785
4786         if (smb3_encryption_required(tcon))
4787                 flags |= CIFS_TRANSFORM_REQ;
4788
4789         memset(&rqst, 0, sizeof(struct smb_rqst));
4790         memset(&iov, 0, sizeof(iov));
4791         rqst.rq_iov = iov;
4792         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
4793
4794         rc = SMB2_query_directory_init(xid, tcon, server,
4795                                        &rqst, persistent_fid,
4796                                        volatile_fid, index,
4797                                        srch_inf->info_level);
4798         if (rc)
4799                 goto qdir_exit;
4800
4801         rc = cifs_send_recv(xid, ses, server,
4802                             &rqst, &resp_buftype, flags, &rsp_iov);
4803         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
4804
4805         if (rc) {
4806                 if (rc == -ENODATA &&
4807                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
4808                         trace_smb3_query_dir_done(xid, persistent_fid,
4809                                 tcon->tid, tcon->ses->Suid, index, 0);
4810                         srch_inf->endOfSearch = true;
4811                         rc = 0;
4812                 } else {
4813                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4814                                 tcon->ses->Suid, index, 0, rc);
4815                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
4816                 }
4817                 goto qdir_exit;
4818         }
4819
4820         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
4821                                         srch_inf);
4822         if (rc) {
4823                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
4824                         tcon->ses->Suid, index, 0, rc);
4825                 goto qdir_exit;
4826         }
4827         resp_buftype = CIFS_NO_BUFFER;
4828
4829         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
4830                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
4831
4832 qdir_exit:
4833         SMB2_query_directory_free(&rqst);
4834         free_rsp_buf(resp_buftype, rsp);
4835         return rc;
4836 }
4837
4838 int
4839 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
4840                    struct smb_rqst *rqst,
4841                    u64 persistent_fid, u64 volatile_fid, u32 pid,
4842                    u8 info_class, u8 info_type, u32 additional_info,
4843                    void **data, unsigned int *size)
4844 {
4845         struct smb2_set_info_req *req;
4846         struct kvec *iov = rqst->rq_iov;
4847         unsigned int i, total_len;
4848         int rc;
4849
4850         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
4851                                  (void **) &req, &total_len);
4852         if (rc)
4853                 return rc;
4854
4855         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4856         req->InfoType = info_type;
4857         req->FileInfoClass = info_class;
4858         req->PersistentFileId = persistent_fid;
4859         req->VolatileFileId = volatile_fid;
4860         req->AdditionalInformation = cpu_to_le32(additional_info);
4861
4862         req->BufferOffset =
4863                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
4864         req->BufferLength = cpu_to_le32(*size);
4865
4866         memcpy(req->Buffer, *data, *size);
4867         total_len += *size;
4868
4869         iov[0].iov_base = (char *)req;
4870         /* 1 for Buffer */
4871         iov[0].iov_len = total_len - 1;
4872
4873         for (i = 1; i < rqst->rq_nvec; i++) {
4874                 le32_add_cpu(&req->BufferLength, size[i]);
4875                 iov[i].iov_base = (char *)data[i];
4876                 iov[i].iov_len = size[i];
4877         }
4878
4879         return 0;
4880 }
4881
4882 void
4883 SMB2_set_info_free(struct smb_rqst *rqst)
4884 {
4885         if (rqst && rqst->rq_iov)
4886                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
4887 }
4888
4889 static int
4890 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4891                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
4892                u8 info_type, u32 additional_info, unsigned int num,
4893                 void **data, unsigned int *size)
4894 {
4895         struct smb_rqst rqst;
4896         struct smb2_set_info_rsp *rsp = NULL;
4897         struct kvec *iov;
4898         struct kvec rsp_iov;
4899         int rc = 0;
4900         int resp_buftype;
4901         struct cifs_ses *ses = tcon->ses;
4902         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4903         int flags = 0;
4904
4905         if (!ses || !server)
4906                 return -EIO;
4907
4908         if (!num)
4909                 return -EINVAL;
4910
4911         if (smb3_encryption_required(tcon))
4912                 flags |= CIFS_TRANSFORM_REQ;
4913
4914         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
4915         if (!iov)
4916                 return -ENOMEM;
4917
4918         memset(&rqst, 0, sizeof(struct smb_rqst));
4919         rqst.rq_iov = iov;
4920         rqst.rq_nvec = num;
4921
4922         rc = SMB2_set_info_init(tcon, server,
4923                                 &rqst, persistent_fid, volatile_fid, pid,
4924                                 info_class, info_type, additional_info,
4925                                 data, size);
4926         if (rc) {
4927                 kfree(iov);
4928                 return rc;
4929         }
4930
4931
4932         rc = cifs_send_recv(xid, ses, server,
4933                             &rqst, &resp_buftype, flags,
4934                             &rsp_iov);
4935         SMB2_set_info_free(&rqst);
4936         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
4937
4938         if (rc != 0) {
4939                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
4940                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
4941                                 ses->Suid, info_class, (__u32)info_type, rc);
4942         }
4943
4944         free_rsp_buf(resp_buftype, rsp);
4945         kfree(iov);
4946         return rc;
4947 }
4948
4949 int
4950 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4951              u64 volatile_fid, u32 pid, __le64 *eof)
4952 {
4953         struct smb2_file_eof_info info;
4954         void *data;
4955         unsigned int size;
4956
4957         info.EndOfFile = *eof;
4958
4959         data = &info;
4960         size = sizeof(struct smb2_file_eof_info);
4961
4962         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4963                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4964                         0, 1, &data, &size);
4965 }
4966
4967 int
4968 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4969                 u64 persistent_fid, u64 volatile_fid,
4970                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4971 {
4972         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4973                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4974                         1, (void **)&pnntsd, &pacllen);
4975 }
4976
4977 int
4978 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4979             u64 persistent_fid, u64 volatile_fid,
4980             struct smb2_file_full_ea_info *buf, int len)
4981 {
4982         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4983                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4984                 0, 1, (void **)&buf, &len);
4985 }
4986
4987 int
4988 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4989                   const u64 persistent_fid, const u64 volatile_fid,
4990                   __u8 oplock_level)
4991 {
4992         struct smb_rqst rqst;
4993         int rc;
4994         struct smb2_oplock_break *req = NULL;
4995         struct cifs_ses *ses = tcon->ses;
4996         struct TCP_Server_Info *server = cifs_pick_channel(ses);
4997         int flags = CIFS_OBREAK_OP;
4998         unsigned int total_len;
4999         struct kvec iov[1];
5000         struct kvec rsp_iov;
5001         int resp_buf_type;
5002
5003         cifs_dbg(FYI, "SMB2_oplock_break\n");
5004         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5005                                  (void **) &req, &total_len);
5006         if (rc)
5007                 return rc;
5008
5009         if (smb3_encryption_required(tcon))
5010                 flags |= CIFS_TRANSFORM_REQ;
5011
5012         req->VolatileFid = volatile_fid;
5013         req->PersistentFid = persistent_fid;
5014         req->OplockLevel = oplock_level;
5015         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5016
5017         flags |= CIFS_NO_RSP_BUF;
5018
5019         iov[0].iov_base = (char *)req;
5020         iov[0].iov_len = total_len;
5021
5022         memset(&rqst, 0, sizeof(struct smb_rqst));
5023         rqst.rq_iov = iov;
5024         rqst.rq_nvec = 1;
5025
5026         rc = cifs_send_recv(xid, ses, server,
5027                             &rqst, &resp_buf_type, flags, &rsp_iov);
5028         cifs_small_buf_release(req);
5029
5030         if (rc) {
5031                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5032                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5033         }
5034
5035         return rc;
5036 }
5037
5038 void
5039 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5040                              struct kstatfs *kst)
5041 {
5042         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5043                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5044         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5045         kst->f_bfree  = kst->f_bavail =
5046                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5047         return;
5048 }
5049
5050 static void
5051 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5052                         struct kstatfs *kst)
5053 {
5054         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5055         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5056         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5057         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5058                 kst->f_bavail = kst->f_bfree;
5059         else
5060                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5061         if (response_data->TotalFileNodes != cpu_to_le64(-1))
5062                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5063         if (response_data->FreeFileNodes != cpu_to_le64(-1))
5064                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5065
5066         return;
5067 }
5068
5069 static int
5070 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5071                    struct TCP_Server_Info *server,
5072                    int level, int outbuf_len, u64 persistent_fid,
5073                    u64 volatile_fid)
5074 {
5075         int rc;
5076         struct smb2_query_info_req *req;
5077         unsigned int total_len;
5078
5079         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5080
5081         if ((tcon->ses == NULL) || server == NULL)
5082                 return -EIO;
5083
5084         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5085                                  (void **) &req, &total_len);
5086         if (rc)
5087                 return rc;
5088
5089         req->InfoType = SMB2_O_INFO_FILESYSTEM;
5090         req->FileInfoClass = level;
5091         req->PersistentFileId = persistent_fid;
5092         req->VolatileFileId = volatile_fid;
5093         /* 1 for pad */
5094         req->InputBufferOffset =
5095                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
5096         req->OutputBufferLength = cpu_to_le32(
5097                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
5098
5099         iov->iov_base = (char *)req;
5100         iov->iov_len = total_len;
5101         return 0;
5102 }
5103
5104 int
5105 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5106               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5107 {
5108         struct smb_rqst rqst;
5109         struct smb2_query_info_rsp *rsp = NULL;
5110         struct kvec iov;
5111         struct kvec rsp_iov;
5112         int rc = 0;
5113         int resp_buftype;
5114         struct cifs_ses *ses = tcon->ses;
5115         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5116         FILE_SYSTEM_POSIX_INFO *info = NULL;
5117         int flags = 0;
5118
5119         rc = build_qfs_info_req(&iov, tcon, server,
5120                                 FS_POSIX_INFORMATION,
5121                                 sizeof(FILE_SYSTEM_POSIX_INFO),
5122                                 persistent_fid, volatile_fid);
5123         if (rc)
5124                 return rc;
5125
5126         if (smb3_encryption_required(tcon))
5127                 flags |= CIFS_TRANSFORM_REQ;
5128
5129         memset(&rqst, 0, sizeof(struct smb_rqst));
5130         rqst.rq_iov = &iov;
5131         rqst.rq_nvec = 1;
5132
5133         rc = cifs_send_recv(xid, ses, server,
5134                             &rqst, &resp_buftype, flags, &rsp_iov);
5135         cifs_small_buf_release(iov.iov_base);
5136         if (rc) {
5137                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5138                 goto posix_qfsinf_exit;
5139         }
5140         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5141
5142         info = (FILE_SYSTEM_POSIX_INFO *)(
5143                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5144         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5145                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5146                                sizeof(FILE_SYSTEM_POSIX_INFO));
5147         if (!rc)
5148                 copy_posix_fs_info_to_kstatfs(info, fsdata);
5149
5150 posix_qfsinf_exit:
5151         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5152         return rc;
5153 }
5154
5155 int
5156 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5157               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5158 {
5159         struct smb_rqst rqst;
5160         struct smb2_query_info_rsp *rsp = NULL;
5161         struct kvec iov;
5162         struct kvec rsp_iov;
5163         int rc = 0;
5164         int resp_buftype;
5165         struct cifs_ses *ses = tcon->ses;
5166         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5167         struct smb2_fs_full_size_info *info = NULL;
5168         int flags = 0;
5169
5170         rc = build_qfs_info_req(&iov, tcon, server,
5171                                 FS_FULL_SIZE_INFORMATION,
5172                                 sizeof(struct smb2_fs_full_size_info),
5173                                 persistent_fid, volatile_fid);
5174         if (rc)
5175                 return rc;
5176
5177         if (smb3_encryption_required(tcon))
5178                 flags |= CIFS_TRANSFORM_REQ;
5179
5180         memset(&rqst, 0, sizeof(struct smb_rqst));
5181         rqst.rq_iov = &iov;
5182         rqst.rq_nvec = 1;
5183
5184         rc = cifs_send_recv(xid, ses, server,
5185                             &rqst, &resp_buftype, flags, &rsp_iov);
5186         cifs_small_buf_release(iov.iov_base);
5187         if (rc) {
5188                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5189                 goto qfsinf_exit;
5190         }
5191         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5192
5193         info = (struct smb2_fs_full_size_info *)(
5194                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5195         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5196                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5197                                sizeof(struct smb2_fs_full_size_info));
5198         if (!rc)
5199                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5200
5201 qfsinf_exit:
5202         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5203         return rc;
5204 }
5205
5206 int
5207 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5208               u64 persistent_fid, u64 volatile_fid, int level)
5209 {
5210         struct smb_rqst rqst;
5211         struct smb2_query_info_rsp *rsp = NULL;
5212         struct kvec iov;
5213         struct kvec rsp_iov;
5214         int rc = 0;
5215         int resp_buftype, max_len, min_len;
5216         struct cifs_ses *ses = tcon->ses;
5217         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5218         unsigned int rsp_len, offset;
5219         int flags = 0;
5220
5221         if (level == FS_DEVICE_INFORMATION) {
5222                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5223                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5224         } else if (level == FS_ATTRIBUTE_INFORMATION) {
5225                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5226                 min_len = MIN_FS_ATTR_INFO_SIZE;
5227         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5228                 max_len = sizeof(struct smb3_fs_ss_info);
5229                 min_len = sizeof(struct smb3_fs_ss_info);
5230         } else if (level == FS_VOLUME_INFORMATION) {
5231                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5232                 min_len = sizeof(struct smb3_fs_vol_info);
5233         } else {
5234                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5235                 return -EINVAL;
5236         }
5237
5238         rc = build_qfs_info_req(&iov, tcon, server,
5239                                 level, max_len,
5240                                 persistent_fid, volatile_fid);
5241         if (rc)
5242                 return rc;
5243
5244         if (smb3_encryption_required(tcon))
5245                 flags |= CIFS_TRANSFORM_REQ;
5246
5247         memset(&rqst, 0, sizeof(struct smb_rqst));
5248         rqst.rq_iov = &iov;
5249         rqst.rq_nvec = 1;
5250
5251         rc = cifs_send_recv(xid, ses, server,
5252                             &rqst, &resp_buftype, flags, &rsp_iov);
5253         cifs_small_buf_release(iov.iov_base);
5254         if (rc) {
5255                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5256                 goto qfsattr_exit;
5257         }
5258         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5259
5260         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5261         offset = le16_to_cpu(rsp->OutputBufferOffset);
5262         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5263         if (rc)
5264                 goto qfsattr_exit;
5265
5266         if (level == FS_ATTRIBUTE_INFORMATION)
5267                 memcpy(&tcon->fsAttrInfo, offset
5268                         + (char *)rsp, min_t(unsigned int,
5269                         rsp_len, max_len));
5270         else if (level == FS_DEVICE_INFORMATION)
5271                 memcpy(&tcon->fsDevInfo, offset
5272                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5273         else if (level == FS_SECTOR_SIZE_INFORMATION) {
5274                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5275                         (offset + (char *)rsp);
5276                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5277                 tcon->perf_sector_size =
5278                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5279         } else if (level == FS_VOLUME_INFORMATION) {
5280                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5281                         (offset + (char *)rsp);
5282                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5283                 tcon->vol_create_time = vol_info->VolumeCreationTime;
5284         }
5285
5286 qfsattr_exit:
5287         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5288         return rc;
5289 }
5290
5291 int
5292 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5293            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5294            const __u32 num_lock, struct smb2_lock_element *buf)
5295 {
5296         struct smb_rqst rqst;
5297         int rc = 0;
5298         struct smb2_lock_req *req = NULL;
5299         struct kvec iov[2];
5300         struct kvec rsp_iov;
5301         int resp_buf_type;
5302         unsigned int count;
5303         int flags = CIFS_NO_RSP_BUF;
5304         unsigned int total_len;
5305         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5306
5307         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
5308
5309         rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
5310                                  (void **) &req, &total_len);
5311         if (rc)
5312                 return rc;
5313
5314         if (smb3_encryption_required(tcon))
5315                 flags |= CIFS_TRANSFORM_REQ;
5316
5317         req->sync_hdr.ProcessId = cpu_to_le32(pid);
5318         req->LockCount = cpu_to_le16(num_lock);
5319
5320         req->PersistentFileId = persist_fid;
5321         req->VolatileFileId = volatile_fid;
5322
5323         count = num_lock * sizeof(struct smb2_lock_element);
5324
5325         iov[0].iov_base = (char *)req;
5326         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
5327         iov[1].iov_base = (char *)buf;
5328         iov[1].iov_len = count;
5329
5330         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
5331
5332         memset(&rqst, 0, sizeof(struct smb_rqst));
5333         rqst.rq_iov = iov;
5334         rqst.rq_nvec = 2;
5335
5336         rc = cifs_send_recv(xid, tcon->ses, server,
5337                             &rqst, &resp_buf_type, flags,
5338                             &rsp_iov);
5339         cifs_small_buf_release(req);
5340         if (rc) {
5341                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
5342                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
5343                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
5344                                     tcon->ses->Suid, rc);
5345         }
5346
5347         return rc;
5348 }
5349
5350 int
5351 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5352           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5353           const __u64 length, const __u64 offset, const __u32 lock_flags,
5354           const bool wait)
5355 {
5356         struct smb2_lock_element lock;
5357
5358         lock.Offset = cpu_to_le64(offset);
5359         lock.Length = cpu_to_le64(length);
5360         lock.Flags = cpu_to_le32(lock_flags);
5361         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5362                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5363
5364         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5365 }
5366
5367 int
5368 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5369                  __u8 *lease_key, const __le32 lease_state)
5370 {
5371         struct smb_rqst rqst;
5372         int rc;
5373         struct smb2_lease_ack *req = NULL;
5374         struct cifs_ses *ses = tcon->ses;
5375         int flags = CIFS_OBREAK_OP;
5376         unsigned int total_len;
5377         struct kvec iov[1];
5378         struct kvec rsp_iov;
5379         int resp_buf_type;
5380         __u64 *please_key_high;
5381         __u64 *please_key_low;
5382         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5383
5384         cifs_dbg(FYI, "SMB2_lease_break\n");
5385         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5386                                  (void **) &req, &total_len);
5387         if (rc)
5388                 return rc;
5389
5390         if (smb3_encryption_required(tcon))
5391                 flags |= CIFS_TRANSFORM_REQ;
5392
5393         req->sync_hdr.CreditRequest = cpu_to_le16(1);
5394         req->StructureSize = cpu_to_le16(36);
5395         total_len += 12;
5396
5397         memcpy(req->LeaseKey, lease_key, 16);
5398         req->LeaseState = lease_state;
5399
5400         flags |= CIFS_NO_RSP_BUF;
5401
5402         iov[0].iov_base = (char *)req;
5403         iov[0].iov_len = total_len;
5404
5405         memset(&rqst, 0, sizeof(struct smb_rqst));
5406         rqst.rq_iov = iov;
5407         rqst.rq_nvec = 1;
5408
5409         rc = cifs_send_recv(xid, ses, server,
5410                             &rqst, &resp_buf_type, flags, &rsp_iov);
5411         cifs_small_buf_release(req);
5412
5413         please_key_low = (__u64 *)lease_key;
5414         please_key_high = (__u64 *)(lease_key+8);
5415         if (rc) {
5416                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5417                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5418                         ses->Suid, *please_key_low, *please_key_high, rc);
5419                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5420         } else
5421                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5422                         ses->Suid, *please_key_low, *please_key_high);
5423
5424         return rc;
5425 }