fs/smb/client/smb2pdu.c

   1 // SPDX-License-Identifier: LGPL-2.1
   2 /*
   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  */
  12
  13  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  14  /* Note that there are handle based routines which must be                   */
  15  /* treated slightly differently for reconnection purposes since we never     */
  16  /* want to reuse a stale file handle and only the caller knows the file info */
  17
  18 #include <linux/fs.h>
  19 #include <linux/kernel.h>
  20 #include <linux/vfs.h>
  21 #include <linux/task_io_accounting_ops.h>
  22 #include <linux/uaccess.h>
  23 #include <linux/uuid.h>
  24 #include <linux/pagemap.h>
  25 #include <linux/xattr.h>
  26 #include "cifsglob.h"
  27 #include "cifsacl.h"
  28 #include "cifsproto.h"
  29 #include "smb2proto.h"
  30 #include "cifs_unicode.h"
  31 #include "cifs_debug.h"
  32 #include "ntlmssp.h"
  33 #include "smb2status.h"
  34 #include "smb2glob.h"
  35 #include "cifspdu.h"
  36 #include "cifs_spnego.h"
  37 #include "smbdirect.h"
  38 #include "trace.h"
  39 #ifdef CONFIG_CIFS_DFS_UPCALL
  40 #include "dfs_cache.h"
  41 #endif
  42 #include "cached_dir.h"
  43
  44 /*
  45  *  The following table defines the expected "StructureSize" of SMB2 requests
  46  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  47  *
  48  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  49  *  indexed by command in host byte order.
  50  */
  51 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  52         /* SMB2_NEGOTIATE */ 36,
  53         /* SMB2_SESSION_SETUP */ 25,
  54         /* SMB2_LOGOFF */ 4,
  55         /* SMB2_TREE_CONNECT */ 9,
  56         /* SMB2_TREE_DISCONNECT */ 4,
  57         /* SMB2_CREATE */ 57,
  58         /* SMB2_CLOSE */ 24,
  59         /* SMB2_FLUSH */ 24,
  60         /* SMB2_READ */ 49,
  61         /* SMB2_WRITE */ 49,
  62         /* SMB2_LOCK */ 48,
  63         /* SMB2_IOCTL */ 57,
  64         /* SMB2_CANCEL */ 4,
  65         /* SMB2_ECHO */ 4,
  66         /* SMB2_QUERY_DIRECTORY */ 33,
  67         /* SMB2_CHANGE_NOTIFY */ 32,
  68         /* SMB2_QUERY_INFO */ 41,
  69         /* SMB2_SET_INFO */ 33,
  70         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  71 };
  72
  73 int smb3_encryption_required(const struct cifs_tcon *tcon)
  74 {
  75         if (!tcon || !tcon->ses)
  76                 return 0;
  77         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  78             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  79                 return 1;
  80         if (tcon->seal &&
  81             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  82                 return 1;
  83         return 0;
  84 }
  85
  86 static void
  87 smb2_hdr_assemble(struct smb2_hdr *shdr, __le16 smb2_cmd,
  88                   const struct cifs_tcon *tcon,
  89                   struct TCP_Server_Info *server)
  90 {
  91         shdr->ProtocolId = SMB2_PROTO_NUMBER;
  92         shdr->StructureSize = cpu_to_le16(64);
  93         shdr->Command = smb2_cmd;
  94         if (server) {
  95                 spin_lock(&server->req_lock);
  96                 /* Request up to 10 credits but don't go over the limit. */
  97                 if (server->credits >= server->max_credits)
  98                         shdr->CreditRequest = cpu_to_le16(0);
  99                 else
 100                         shdr->CreditRequest = cpu_to_le16(
 101                                 min_t(int, server->max_credits -
 102                                                 server->credits, 10));
 103                 spin_unlock(&server->req_lock);
 104         } else {
 105                 shdr->CreditRequest = cpu_to_le16(2);
 106         }
 107         shdr->Id.SyncId.ProcessId = cpu_to_le32((__u16)current->tgid);
 108
 109         if (!tcon)
 110                 goto out;
 111
 112         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 113         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 114         if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 115                 shdr->CreditCharge = cpu_to_le16(1);
 116         /* else CreditCharge MBZ */
 117
 118         shdr->Id.SyncId.TreeId = cpu_to_le32(tcon->tid);
 119         /* Uid is not converted */
 120         if (tcon->ses)
 121                 shdr->SessionId = cpu_to_le64(tcon->ses->Suid);
 122
 123         /*
 124          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 125          * to pass the path on the Open SMB prefixed by \\server\share.
 126          * Not sure when we would need to do the augmented path (if ever) and
 127          * setting this flag breaks the SMB2 open operation since it is
 128          * illegal to send an empty path name (without \\server\share prefix)
 129          * when the DFS flag is set in the SMB open header. We could
 130          * consider setting the flag on all operations other than open
 131          * but it is safer to net set it for now.
 132          */
 133 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 134                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 135
 136         if (server && server->sign && !smb3_encryption_required(tcon))
 137                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 138 out:
 139         return;
 140 }
 141
 142 static int
 143 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
 144                struct TCP_Server_Info *server)
 145 {
 146         int rc = 0;
 147         struct nls_table *nls_codepage = NULL;
 148         struct cifs_ses *ses;
 149
 150         /*
 151          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 152          * check for tcp and smb session status done differently
 153          * for those three - in the calling routine.
 154          */
 155         if (tcon == NULL)
 156                 return 0;
 157
 158         /*
 159          * Need to also skip SMB2_IOCTL because it is used for checking nested dfs links in
 160          * cifs_tree_connect().
 161          */
 162         if (smb2_command == SMB2_TREE_CONNECT || smb2_command == SMB2_IOCTL)
 163                 return 0;
 164
 165         spin_lock(&tcon->tc_lock);
 166         if (tcon->status == TID_EXITING) {
 167                 /*
 168                  * only tree disconnect allowed when disconnecting ...
 169                  */
 170                 if (smb2_command != SMB2_TREE_DISCONNECT) {
 171                         spin_unlock(&tcon->tc_lock);
 172                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 173                                  smb2_command);
 174                         return -ENODEV;
 175                 }
 176         }
 177         spin_unlock(&tcon->tc_lock);
 178
 179         ses = tcon->ses;
 180         if (!ses)
 181                 return -EIO;
 182         spin_lock(&ses->ses_lock);
 183         if (ses->ses_status == SES_EXITING) {
 184                 spin_unlock(&ses->ses_lock);
 185                 return -EIO;
 186         }
 187         spin_unlock(&ses->ses_lock);
 188         if (!ses->server || !server)
 189                 return -EIO;
 190
 191         spin_lock(&server->srv_lock);
 192         if (server->tcpStatus == CifsNeedReconnect) {
 193                 /*
 194                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 195                  * here since they are implicitly done when session drops.
 196                  */
 197                 switch (smb2_command) {
 198                 /*
 199                  * BB Should we keep oplock break and add flush to exceptions?
 200                  */
 201                 case SMB2_TREE_DISCONNECT:
 202                 case SMB2_CANCEL:
 203                 case SMB2_CLOSE:
 204                 case SMB2_OPLOCK_BREAK:
 205                         spin_unlock(&server->srv_lock);
 206                         return -EAGAIN;
 207                 }
 208         }
 209         spin_unlock(&server->srv_lock);
 210
 211 again:
 212         rc = cifs_wait_for_server_reconnect(server, tcon->retry);
 213         if (rc)
 214                 return rc;
 215
 216         spin_lock(&ses->chan_lock);
 217         if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) {
 218                 spin_unlock(&ses->chan_lock);
 219                 return 0;
 220         }
 221         spin_unlock(&ses->chan_lock);
 222         cifs_dbg(FYI, "sess reconnect mask: 0x%lx, tcon reconnect: %d",
 223                  tcon->ses->chans_need_reconnect,
 224                  tcon->need_reconnect);
 225
 226         mutex_lock(&ses->session_mutex);
 227         /*
 228          * Recheck after acquire mutex. If another thread is negotiating
 229          * and the server never sends an answer the socket will be closed
 230          * and tcpStatus set to reconnect.
 231          */
 232         spin_lock(&server->srv_lock);
 233         if (server->tcpStatus == CifsNeedReconnect) {
 234                 spin_unlock(&server->srv_lock);
 235                 mutex_unlock(&ses->session_mutex);
 236
 237                 if (tcon->retry)
 238                         goto again;
 239
 240                 rc = -EHOSTDOWN;
 241                 goto out;
 242         }
 243         spin_unlock(&server->srv_lock);
 244
 245         nls_codepage = load_nls_default();
 246
 247         /*
 248          * need to prevent multiple threads trying to simultaneously
 249          * reconnect the same SMB session
 250          */
 251         spin_lock(&ses->ses_lock);
 252         spin_lock(&ses->chan_lock);
 253         if (!cifs_chan_needs_reconnect(ses, server) &&
 254             ses->ses_status == SES_GOOD) {
 255                 spin_unlock(&ses->chan_lock);
 256                 spin_unlock(&ses->ses_lock);
 257                 /* this means that we only need to tree connect */
 258                 if (tcon->need_reconnect)
 259                         goto skip_sess_setup;
 260
 261                 mutex_unlock(&ses->session_mutex);
 262                 goto out;
 263         }
 264         spin_unlock(&ses->chan_lock);
 265         spin_unlock(&ses->ses_lock);
 266
 267         rc = cifs_negotiate_protocol(0, ses, server);
 268         if (!rc) {
 269                 rc = cifs_setup_session(0, ses, server, nls_codepage);
 270                 if ((rc == -EACCES) && !tcon->retry) {
 271                         mutex_unlock(&ses->session_mutex);
 272                         rc = -EHOSTDOWN;
 273                         goto failed;
 274                 } else if (rc) {
 275                         mutex_unlock(&ses->session_mutex);
 276                         goto out;
 277                 }
 278         } else {
 279                 mutex_unlock(&ses->session_mutex);
 280                 goto out;
 281         }
 282
 283 skip_sess_setup:
 284         if (!tcon->need_reconnect) {
 285                 mutex_unlock(&ses->session_mutex);
 286                 goto out;
 287         }
 288         cifs_mark_open_files_invalid(tcon);
 289         if (tcon->use_persistent)
 290                 tcon->need_reopen_files = true;
 291
 292         rc = cifs_tree_connect(0, tcon, nls_codepage);
 293         mutex_unlock(&ses->session_mutex);
 294
 295         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 296         if (rc) {
 297                 /* If sess reconnected but tcon didn't, something strange ... */
 298                 cifs_dbg(VFS, "reconnect tcon failed rc = %d\n", rc);
 299                 goto out;
 300         }
 301
 302         if (smb2_command != SMB2_INTERNAL_CMD)
 303                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
 304
 305         atomic_inc(&tconInfoReconnectCount);
 306 out:
 307         /*
 308          * Check if handle based operation so we know whether we can continue
 309          * or not without returning to caller to reset file handle.
 310          */
 311         /*
 312          * BB Is flush done by server on drop of tcp session? Should we special
 313          * case it and skip above?
 314          */
 315         switch (smb2_command) {
 316         case SMB2_FLUSH:
 317         case SMB2_READ:
 318         case SMB2_WRITE:
 319         case SMB2_LOCK:
 320         case SMB2_QUERY_DIRECTORY:
 321         case SMB2_CHANGE_NOTIFY:
 322         case SMB2_QUERY_INFO:
 323         case SMB2_SET_INFO:
 324                 rc = -EAGAIN;
 325         }
 326 failed:
 327         unload_nls(nls_codepage);
 328         return rc;
 329 }
 330
 331 static void
 332 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
 333                struct TCP_Server_Info *server,
 334                void *buf,
 335                unsigned int *total_len)
 336 {
 337         struct smb2_pdu *spdu = buf;
 338         /* lookup word count ie StructureSize from table */
 339         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 340
 341         /*
 342          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 343          * largest operations (Create)
 344          */
 345         memset(buf, 0, 256);
 346
 347         smb2_hdr_assemble(&spdu->hdr, smb2_command, tcon, server);
 348         spdu->StructureSize2 = cpu_to_le16(parmsize);
 349
 350         *total_len = parmsize + sizeof(struct smb2_hdr);
 351 }
 352
 353 /*
 354  * Allocate and return pointer to an SMB request hdr, and set basic
 355  * SMB information in the SMB header. If the return code is zero, this
 356  * function must have filled in request_buf pointer.
 357  */
 358 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 359                                  struct TCP_Server_Info *server,
 360                                  void **request_buf, unsigned int *total_len)
 361 {
 362         /* BB eventually switch this to SMB2 specific small buf size */
 363         if (smb2_command == SMB2_SET_INFO)
 364                 *request_buf = cifs_buf_get();
 365         else
 366                 *request_buf = cifs_small_buf_get();
 367         if (*request_buf == NULL) {
 368                 /* BB should we add a retry in here if not a writepage? */
 369                 return -ENOMEM;
 370         }
 371
 372         fill_small_buf(smb2_command, tcon, server,
 373                        (struct smb2_hdr *)(*request_buf),
 374                        total_len);
 375
 376         if (tcon != NULL) {
 377                 uint16_t com_code = le16_to_cpu(smb2_command);
 378                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 379                 cifs_stats_inc(&tcon->num_smbs_sent);
 380         }
 381
 382         return 0;
 383 }
 384
 385 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 386                                struct TCP_Server_Info *server,
 387                                void **request_buf, unsigned int *total_len)
 388 {
 389         int rc;
 390
 391         rc = smb2_reconnect(smb2_command, tcon, server);
 392         if (rc)
 393                 return rc;
 394
 395         return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
 396                                      total_len);
 397 }
 398
 399 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 400                                struct TCP_Server_Info *server,
 401                                void **request_buf, unsigned int *total_len)
 402 {
 403         /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
 404         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
 405                 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 406                                              request_buf, total_len);
 407         }
 408         return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 409                                    request_buf, total_len);
 410 }
 411
 412 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 413
 414 static void
 415 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 416 {
 417         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 418         pneg_ctxt->DataLength = cpu_to_le16(38);
 419         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 420         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 421         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 422         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 423 }
 424
 425 static void
 426 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 427 {
 428         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 429         pneg_ctxt->DataLength =
 430                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 431                           - sizeof(struct smb2_neg_context));
 432         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 433         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 434         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 435         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 436 }
 437
 438 static unsigned int
 439 build_signing_ctxt(struct smb2_signing_capabilities *pneg_ctxt)
 440 {
 441         unsigned int ctxt_len = sizeof(struct smb2_signing_capabilities);
 442         unsigned short num_algs = 1; /* number of signing algorithms sent */
 443
 444         pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES;
 445         /*
 446          * Context Data length must be rounded to multiple of 8 for some servers
 447          */
 448         pneg_ctxt->DataLength = cpu_to_le16(ALIGN(sizeof(struct smb2_signing_capabilities) -
 449                                             sizeof(struct smb2_neg_context) +
 450                                             (num_algs * sizeof(u16)), 8));
 451         pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(num_algs);
 452         pneg_ctxt->SigningAlgorithms[0] = cpu_to_le16(SIGNING_ALG_AES_CMAC);
 453
 454         ctxt_len += sizeof(__le16) * num_algs;
 455         ctxt_len = ALIGN(ctxt_len, 8);
 456         return ctxt_len;
 457         /* TBD add SIGNING_ALG_AES_GMAC and/or SIGNING_ALG_HMAC_SHA256 */
 458 }
 459
 460 static void
 461 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 462 {
 463         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 464         if (require_gcm_256) {
 465                 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
 466                 pneg_ctxt->CipherCount = cpu_to_le16(1);
 467                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
 468         } else if (enable_gcm_256) {
 469                 pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
 470                 pneg_ctxt->CipherCount = cpu_to_le16(3);
 471                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 472                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
 473                 pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
 474         } else {
 475                 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
 476                 pneg_ctxt->CipherCount = cpu_to_le16(2);
 477                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 478                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 479         }
 480 }
 481
 482 static unsigned int
 483 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 484 {
 485         struct nls_table *cp = load_nls_default();
 486
 487         pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 488
 489         /* copy up to max of first 100 bytes of server name to NetName field */
 490         pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 491         /* context size is DataLength + minimal smb2_neg_context */
 492         return ALIGN(le16_to_cpu(pneg_ctxt->DataLength) + sizeof(struct smb2_neg_context), 8);
 493 }
 494
 495 static void
 496 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 497 {
 498         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 499         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 500         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 501         pneg_ctxt->Name[0] = 0x93;
 502         pneg_ctxt->Name[1] = 0xAD;
 503         pneg_ctxt->Name[2] = 0x25;
 504         pneg_ctxt->Name[3] = 0x50;
 505         pneg_ctxt->Name[4] = 0x9C;
 506         pneg_ctxt->Name[5] = 0xB4;
 507         pneg_ctxt->Name[6] = 0x11;
 508         pneg_ctxt->Name[7] = 0xE7;
 509         pneg_ctxt->Name[8] = 0xB4;
 510         pneg_ctxt->Name[9] = 0x23;
 511         pneg_ctxt->Name[10] = 0x83;
 512         pneg_ctxt->Name[11] = 0xDE;
 513         pneg_ctxt->Name[12] = 0x96;
 514         pneg_ctxt->Name[13] = 0x8B;
 515         pneg_ctxt->Name[14] = 0xCD;
 516         pneg_ctxt->Name[15] = 0x7C;
 517 }
 518
 519 static void
 520 assemble_neg_contexts(struct smb2_negotiate_req *req,
 521                       struct TCP_Server_Info *server, unsigned int *total_len)
 522 {
 523         unsigned int ctxt_len, neg_context_count;
 524         struct TCP_Server_Info *pserver;
 525         char *pneg_ctxt;
 526         char *hostname;
 527
 528         if (*total_len > 200) {
 529                 /* In case length corrupted don't want to overrun smb buffer */
 530                 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 531                 return;
 532         }
 533
 534         /*
 535          * round up total_len of fixed part of SMB3 negotiate request to 8
 536          * byte boundary before adding negotiate contexts
 537          */
 538         *total_len = ALIGN(*total_len, 8);
 539
 540         pneg_ctxt = (*total_len) + (char *)req;
 541         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 542
 543         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 544         ctxt_len = ALIGN(sizeof(struct smb2_preauth_neg_context), 8);
 545         *total_len += ctxt_len;
 546         pneg_ctxt += ctxt_len;
 547
 548         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 549         ctxt_len = ALIGN(sizeof(struct smb2_encryption_neg_context), 8);
 550         *total_len += ctxt_len;
 551         pneg_ctxt += ctxt_len;
 552
 553         /*
 554          * secondary channels don't have the hostname field populated
 555          * use the hostname field in the primary channel instead
 556          */
 557         pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
 558         cifs_server_lock(pserver);
 559         hostname = pserver->hostname;
 560         if (hostname && (hostname[0] != 0)) {
 561                 ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 562                                               hostname);
 563                 *total_len += ctxt_len;
 564                 pneg_ctxt += ctxt_len;
 565                 neg_context_count = 3;
 566         } else
 567                 neg_context_count = 2;
 568         cifs_server_unlock(pserver);
 569
 570         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 571         *total_len += sizeof(struct smb2_posix_neg_context);
 572         pneg_ctxt += sizeof(struct smb2_posix_neg_context);
 573         neg_context_count++;
 574
 575         if (server->compress_algorithm) {
 576                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 577                                 pneg_ctxt);
 578                 ctxt_len = ALIGN(sizeof(struct smb2_compression_capabilities_context), 8);
 579                 *total_len += ctxt_len;
 580                 pneg_ctxt += ctxt_len;
 581                 neg_context_count++;
 582         }
 583
 584         if (enable_negotiate_signing) {
 585                 ctxt_len = build_signing_ctxt((struct smb2_signing_capabilities *)
 586                                 pneg_ctxt);
 587                 *total_len += ctxt_len;
 588                 pneg_ctxt += ctxt_len;
 589                 neg_context_count++;
 590         }
 591
 592         /* check for and add transport_capabilities and signing capabilities */
 593         req->NegotiateContextCount = cpu_to_le16(neg_context_count);
 594
 595 }
 596
 597 /* If invalid preauth context warn but use what we requested, SHA-512 */
 598 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 599 {
 600         unsigned int len = le16_to_cpu(ctxt->DataLength);
 601
 602         /*
 603          * Caller checked that DataLength remains within SMB boundary. We still
 604          * need to confirm that one HashAlgorithms member is accounted for.
 605          */
 606         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 607                 pr_warn_once("server sent bad preauth context\n");
 608                 return;
 609         } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
 610                 pr_warn_once("server sent invalid SaltLength\n");
 611                 return;
 612         }
 613         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 614                 pr_warn_once("Invalid SMB3 hash algorithm count\n");
 615         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 616                 pr_warn_once("unknown SMB3 hash algorithm\n");
 617 }
 618
 619 static void decode_compress_ctx(struct TCP_Server_Info *server,
 620                          struct smb2_compression_capabilities_context *ctxt)
 621 {
 622         unsigned int len = le16_to_cpu(ctxt->DataLength);
 623
 624         /*
 625          * Caller checked that DataLength remains within SMB boundary. We still
 626          * need to confirm that one CompressionAlgorithms member is accounted
 627          * for.
 628          */
 629         if (len < 10) {
 630                 pr_warn_once("server sent bad compression cntxt\n");
 631                 return;
 632         }
 633         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 634                 pr_warn_once("Invalid SMB3 compress algorithm count\n");
 635                 return;
 636         }
 637         if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 638                 pr_warn_once("unknown compression algorithm\n");
 639                 return;
 640         }
 641         server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 642 }
 643
 644 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 645                               struct smb2_encryption_neg_context *ctxt)
 646 {
 647         unsigned int len = le16_to_cpu(ctxt->DataLength);
 648
 649         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 650         /*
 651          * Caller checked that DataLength remains within SMB boundary. We still
 652          * need to confirm that one Cipher flexible array member is accounted
 653          * for.
 654          */
 655         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 656                 pr_warn_once("server sent bad crypto ctxt len\n");
 657                 return -EINVAL;
 658         }
 659
 660         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 661                 pr_warn_once("Invalid SMB3.11 cipher count\n");
 662                 return -EINVAL;
 663         }
 664         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 665         if (require_gcm_256) {
 666                 if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
 667                         cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
 668                         return -EOPNOTSUPP;
 669                 }
 670         } else if (ctxt->Ciphers[0] == 0) {
 671                 /*
 672                  * e.g. if server only supported AES256_CCM (very unlikely)
 673                  * or server supported no encryption types or had all disabled.
 674                  * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
 675                  * in which mount requested encryption ("seal") checks later
 676                  * on during tree connection will return proper rc, but if
 677                  * seal not requested by client, since server is allowed to
 678                  * return 0 to indicate no supported cipher, we can't fail here
 679                  */
 680                 server->cipher_type = 0;
 681                 server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
 682                 pr_warn_once("Server does not support requested encryption types\n");
 683                 return 0;
 684         } else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 685                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
 686                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
 687                 /* server returned a cipher we didn't ask for */
 688                 pr_warn_once("Invalid SMB3.11 cipher returned\n");
 689                 return -EINVAL;
 690         }
 691         server->cipher_type = ctxt->Ciphers[0];
 692         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 693         return 0;
 694 }
 695
 696 static void decode_signing_ctx(struct TCP_Server_Info *server,
 697                                struct smb2_signing_capabilities *pctxt)
 698 {
 699         unsigned int len = le16_to_cpu(pctxt->DataLength);
 700
 701         /*
 702          * Caller checked that DataLength remains within SMB boundary. We still
 703          * need to confirm that one SigningAlgorithms flexible array member is
 704          * accounted for.
 705          */
 706         if ((len < 4) || (len > 16)) {
 707                 pr_warn_once("server sent bad signing negcontext\n");
 708                 return;
 709         }
 710         if (le16_to_cpu(pctxt->SigningAlgorithmCount) != 1) {
 711                 pr_warn_once("Invalid signing algorithm count\n");
 712                 return;
 713         }
 714         if (le16_to_cpu(pctxt->SigningAlgorithms[0]) > 2) {
 715                 pr_warn_once("unknown signing algorithm\n");
 716                 return;
 717         }
 718
 719         server->signing_negotiated = true;
 720         server->signing_algorithm = le16_to_cpu(pctxt->SigningAlgorithms[0]);
 721         cifs_dbg(FYI, "signing algorithm %d chosen\n",
 722                      server->signing_algorithm);
 723 }
 724
 725
 726 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 727                                      struct TCP_Server_Info *server,
 728                                      unsigned int len_of_smb)
 729 {
 730         struct smb2_neg_context *pctx;
 731         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 732         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 733         unsigned int len_of_ctxts, i;
 734         int rc = 0;
 735
 736         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 737         if (len_of_smb <= offset) {
 738                 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 739                 return -EINVAL;
 740         }
 741
 742         len_of_ctxts = len_of_smb - offset;
 743
 744         for (i = 0; i < ctxt_cnt; i++) {
 745                 int clen;
 746                 /* check that offset is not beyond end of SMB */
 747                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 748                         break;
 749
 750                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 751                 clen = sizeof(struct smb2_neg_context)
 752                         + le16_to_cpu(pctx->DataLength);
 753                 /*
 754                  * 2.2.4 SMB2 NEGOTIATE Response
 755                  * Subsequent negotiate contexts MUST appear at the first 8-byte
 756                  * aligned offset following the previous negotiate context.
 757                  */
 758                 if (i + 1 != ctxt_cnt)
 759                         clen = ALIGN(clen, 8);
 760                 if (clen > len_of_ctxts)
 761                         break;
 762
 763                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 764                         decode_preauth_context(
 765                                 (struct smb2_preauth_neg_context *)pctx);
 766                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 767                         rc = decode_encrypt_ctx(server,
 768                                 (struct smb2_encryption_neg_context *)pctx);
 769                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 770                         decode_compress_ctx(server,
 771                                 (struct smb2_compression_capabilities_context *)pctx);
 772                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 773                         server->posix_ext_supported = true;
 774                 else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES)
 775                         decode_signing_ctx(server,
 776                                 (struct smb2_signing_capabilities *)pctx);
 777                 else
 778                         cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 779                                 le16_to_cpu(pctx->ContextType));
 780                 if (rc)
 781                         break;
 782
 783                 offset += clen;
 784                 len_of_ctxts -= clen;
 785         }
 786         return rc;
 787 }
 788
 789 static struct create_posix *
 790 create_posix_buf(umode_t mode)
 791 {
 792         struct create_posix *buf;
 793
 794         buf = kzalloc(sizeof(struct create_posix),
 795                         GFP_KERNEL);
 796         if (!buf)
 797                 return NULL;
 798
 799         buf->ccontext.DataOffset =
 800                 cpu_to_le16(offsetof(struct create_posix, Mode));
 801         buf->ccontext.DataLength = cpu_to_le32(4);
 802         buf->ccontext.NameOffset =
 803                 cpu_to_le16(offsetof(struct create_posix, Name));
 804         buf->ccontext.NameLength = cpu_to_le16(16);
 805
 806         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 807         buf->Name[0] = 0x93;
 808         buf->Name[1] = 0xAD;
 809         buf->Name[2] = 0x25;
 810         buf->Name[3] = 0x50;
 811         buf->Name[4] = 0x9C;
 812         buf->Name[5] = 0xB4;
 813         buf->Name[6] = 0x11;
 814         buf->Name[7] = 0xE7;
 815         buf->Name[8] = 0xB4;
 816         buf->Name[9] = 0x23;
 817         buf->Name[10] = 0x83;
 818         buf->Name[11] = 0xDE;
 819         buf->Name[12] = 0x96;
 820         buf->Name[13] = 0x8B;
 821         buf->Name[14] = 0xCD;
 822         buf->Name[15] = 0x7C;
 823         buf->Mode = cpu_to_le32(mode);
 824         cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
 825         return buf;
 826 }
 827
 828 static int
 829 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 830 {
 831         unsigned int num = *num_iovec;
 832
 833         iov[num].iov_base = create_posix_buf(mode);
 834         if (mode == ACL_NO_MODE)
 835                 cifs_dbg(FYI, "Invalid mode\n");
 836         if (iov[num].iov_base == NULL)
 837                 return -ENOMEM;
 838         iov[num].iov_len = sizeof(struct create_posix);
 839         *num_iovec = num + 1;
 840         return 0;
 841 }
 842
 843
 844 /*
 845  *
 846  *      SMB2 Worker functions follow:
 847  *
 848  *      The general structure of the worker functions is:
 849  *      1) Call smb2_init (assembles SMB2 header)
 850  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 851  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 852  *      4) Decode SMB2 command specific fields in the fixed length area
 853  *      5) Decode variable length data area (if any for this SMB2 command type)
 854  *      6) Call free smb buffer
 855  *      7) return
 856  *
 857  */
 858
 859 int
 860 SMB2_negotiate(const unsigned int xid,
 861                struct cifs_ses *ses,
 862                struct TCP_Server_Info *server)
 863 {
 864         struct smb_rqst rqst;
 865         struct smb2_negotiate_req *req;
 866         struct smb2_negotiate_rsp *rsp;
 867         struct kvec iov[1];
 868         struct kvec rsp_iov;
 869         int rc;
 870         int resp_buftype;
 871         int blob_offset, blob_length;
 872         char *security_blob;
 873         int flags = CIFS_NEG_OP;
 874         unsigned int total_len;
 875
 876         cifs_dbg(FYI, "Negotiate protocol\n");
 877
 878         if (!server) {
 879                 WARN(1, "%s: server is NULL!\n", __func__);
 880                 return -EIO;
 881         }
 882
 883         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
 884                                  (void **) &req, &total_len);
 885         if (rc)
 886                 return rc;
 887
 888         req->hdr.SessionId = 0;
 889
 890         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 891         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 892
 893         if (strcmp(server->vals->version_string,
 894                    SMB3ANY_VERSION_STRING) == 0) {
 895                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 896                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 897                 req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
 898                 req->DialectCount = cpu_to_le16(3);
 899                 total_len += 6;
 900         } else if (strcmp(server->vals->version_string,
 901                    SMBDEFAULT_VERSION_STRING) == 0) {
 902                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 903                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 904                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 905                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 906                 req->DialectCount = cpu_to_le16(4);
 907                 total_len += 8;
 908         } else {
 909                 /* otherwise send specific dialect */
 910                 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
 911                 req->DialectCount = cpu_to_le16(1);
 912                 total_len += 2;
 913         }
 914
 915         /* only one of SMB2 signing flags may be set in SMB2 request */
 916         if (ses->sign)
 917                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 918         else if (global_secflags & CIFSSEC_MAY_SIGN)
 919                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 920         else
 921                 req->SecurityMode = 0;
 922
 923         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
 924         if (ses->chan_max > 1)
 925                 req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
 926
 927         /* ClientGUID must be zero for SMB2.02 dialect */
 928         if (server->vals->protocol_id == SMB20_PROT_ID)
 929                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 930         else {
 931                 memcpy(req->ClientGUID, server->client_guid,
 932                         SMB2_CLIENT_GUID_SIZE);
 933                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
 934                     (strcmp(server->vals->version_string,
 935                      SMB3ANY_VERSION_STRING) == 0) ||
 936                     (strcmp(server->vals->version_string,
 937                      SMBDEFAULT_VERSION_STRING) == 0))
 938                         assemble_neg_contexts(req, server, &total_len);
 939         }
 940         iov[0].iov_base = (char *)req;
 941         iov[0].iov_len = total_len;
 942
 943         memset(&rqst, 0, sizeof(struct smb_rqst));
 944         rqst.rq_iov = iov;
 945         rqst.rq_nvec = 1;
 946
 947         rc = cifs_send_recv(xid, ses, server,
 948                             &rqst, &resp_buftype, flags, &rsp_iov);
 949         cifs_small_buf_release(req);
 950         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 951         /*
 952          * No tcon so can't do
 953          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 954          */
 955         if (rc == -EOPNOTSUPP) {
 956                 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");
 957                 goto neg_exit;
 958         } else if (rc != 0)
 959                 goto neg_exit;
 960
 961         rc = -EIO;
 962         if (strcmp(server->vals->version_string,
 963                    SMB3ANY_VERSION_STRING) == 0) {
 964                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 965                         cifs_server_dbg(VFS,
 966                                 "SMB2 dialect returned but not requested\n");
 967                         goto neg_exit;
 968                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 969                         cifs_server_dbg(VFS,
 970                                 "SMB2.1 dialect returned but not requested\n");
 971                         goto neg_exit;
 972                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 973                         /* ops set to 3.0 by default for default so update */
 974                         server->ops = &smb311_operations;
 975                         server->vals = &smb311_values;
 976                 }
 977         } else if (strcmp(server->vals->version_string,
 978                    SMBDEFAULT_VERSION_STRING) == 0) {
 979                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 980                         cifs_server_dbg(VFS,
 981                                 "SMB2 dialect returned but not requested\n");
 982                         goto neg_exit;
 983                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 984                         /* ops set to 3.0 by default for default so update */
 985                         server->ops = &smb21_operations;
 986                         server->vals = &smb21_values;
 987                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 988                         server->ops = &smb311_operations;
 989                         server->vals = &smb311_values;
 990                 }
 991         } else if (le16_to_cpu(rsp->DialectRevision) !=
 992                                 server->vals->protocol_id) {
 993                 /* if requested single dialect ensure returned dialect matched */
 994                 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
 995                                 le16_to_cpu(rsp->DialectRevision));
 996                 goto neg_exit;
 997         }
 998
 999         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
1000
1001         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
1002                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
1003         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
1004                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
1005         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
1006                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
1007         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
1008                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
1009         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
1010                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
1011         else {
1012                 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
1013                                 le16_to_cpu(rsp->DialectRevision));
1014                 goto neg_exit;
1015         }
1016
1017         rc = 0;
1018         server->dialect = le16_to_cpu(rsp->DialectRevision);
1019
1020         /*
1021          * Keep a copy of the hash after negprot. This hash will be
1022          * the starting hash value for all sessions made from this
1023          * server.
1024          */
1025         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
1026                SMB2_PREAUTH_HASH_SIZE);
1027
1028         /* SMB2 only has an extended negflavor */
1029         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
1030         /* set it to the maximum buffer size value we can send with 1 credit */
1031         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
1032                                SMB2_MAX_BUFFER_SIZE);
1033         server->max_read = le32_to_cpu(rsp->MaxReadSize);
1034         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
1035         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
1036         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
1037                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
1038                                 server->sec_mode);
1039         server->capabilities = le32_to_cpu(rsp->Capabilities);
1040         /* Internal types */
1041         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
1042
1043         /*
1044          * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context
1045          * Set the cipher type manually.
1046          */
1047         if (server->dialect == SMB30_PROT_ID && (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1048                 server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
1049
1050         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
1051                                                (struct smb2_hdr *)rsp);
1052         /*
1053          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
1054          * for us will be
1055          *      ses->sectype = RawNTLMSSP;
1056          * but for time being this is our only auth choice so doesn't matter.
1057          * We just found a server which sets blob length to zero expecting raw.
1058          */
1059         if (blob_length == 0) {
1060                 cifs_dbg(FYI, "missing security blob on negprot\n");
1061                 server->sec_ntlmssp = true;
1062         }
1063
1064         rc = cifs_enable_signing(server, ses->sign);
1065         if (rc)
1066                 goto neg_exit;
1067         if (blob_length) {
1068                 rc = decode_negTokenInit(security_blob, blob_length, server);
1069                 if (rc == 1)
1070                         rc = 0;
1071                 else if (rc == 0)
1072                         rc = -EIO;
1073         }
1074
1075         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1076                 if (rsp->NegotiateContextCount)
1077                         rc = smb311_decode_neg_context(rsp, server,
1078                                                        rsp_iov.iov_len);
1079                 else
1080                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
1081         }
1082 neg_exit:
1083         free_rsp_buf(resp_buftype, rsp);
1084         return rc;
1085 }
1086
1087 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1088 {
1089         int rc;
1090         struct validate_negotiate_info_req *pneg_inbuf;
1091         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1092         u32 rsplen;
1093         u32 inbuflen; /* max of 4 dialects */
1094         struct TCP_Server_Info *server = tcon->ses->server;
1095
1096         cifs_dbg(FYI, "validate negotiate\n");
1097
1098         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1099         if (server->dialect == SMB311_PROT_ID)
1100                 return 0;
1101
1102         /*
1103          * validation ioctl must be signed, so no point sending this if we
1104          * can not sign it (ie are not known user).  Even if signing is not
1105          * required (enabled but not negotiated), in those cases we selectively
1106          * sign just this, the first and only signed request on a connection.
1107          * Having validation of negotiate info  helps reduce attack vectors.
1108          */
1109         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1110                 return 0; /* validation requires signing */
1111
1112         if (tcon->ses->user_name == NULL) {
1113                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1114                 return 0; /* validation requires signing */
1115         }
1116
1117         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1118                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1119
1120         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1121         if (!pneg_inbuf)
1122                 return -ENOMEM;
1123
1124         pneg_inbuf->Capabilities =
1125                         cpu_to_le32(server->vals->req_capabilities);
1126         if (tcon->ses->chan_max > 1)
1127                 pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1128
1129         memcpy(pneg_inbuf->Guid, server->client_guid,
1130                                         SMB2_CLIENT_GUID_SIZE);
1131
1132         if (tcon->ses->sign)
1133                 pneg_inbuf->SecurityMode =
1134                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1135         else if (global_secflags & CIFSSEC_MAY_SIGN)
1136                 pneg_inbuf->SecurityMode =
1137                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1138         else
1139                 pneg_inbuf->SecurityMode = 0;
1140
1141
1142         if (strcmp(server->vals->version_string,
1143                 SMB3ANY_VERSION_STRING) == 0) {
1144                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1145                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1146                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1147                 pneg_inbuf->DialectCount = cpu_to_le16(3);
1148                 /* SMB 2.1 not included so subtract one dialect from len */
1149                 inbuflen = sizeof(*pneg_inbuf) -
1150                                 (sizeof(pneg_inbuf->Dialects[0]));
1151         } else if (strcmp(server->vals->version_string,
1152                 SMBDEFAULT_VERSION_STRING) == 0) {
1153                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1154                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1155                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1156                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1157                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1158                 /* structure is big enough for 4 dialects */
1159                 inbuflen = sizeof(*pneg_inbuf);
1160         } else {
1161                 /* otherwise specific dialect was requested */
1162                 pneg_inbuf->Dialects[0] =
1163                         cpu_to_le16(server->vals->protocol_id);
1164                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1165                 /* structure is big enough for 4 dialects, sending only 1 */
1166                 inbuflen = sizeof(*pneg_inbuf) -
1167                                 sizeof(pneg_inbuf->Dialects[0]) * 3;
1168         }
1169
1170         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1171                 FSCTL_VALIDATE_NEGOTIATE_INFO,
1172                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1173                 (char **)&pneg_rsp, &rsplen);
1174         if (rc == -EOPNOTSUPP) {
1175                 /*
1176                  * Old Windows versions or Netapp SMB server can return
1177                  * not supported error. Client should accept it.
1178                  */
1179                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1180                 rc = 0;
1181                 goto out_free_inbuf;
1182         } else if (rc != 0) {
1183                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1184                               rc);
1185                 rc = -EIO;
1186                 goto out_free_inbuf;
1187         }
1188
1189         rc = -EIO;
1190         if (rsplen != sizeof(*pneg_rsp)) {
1191                 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1192                               rsplen);
1193
1194                 /* relax check since Mac returns max bufsize allowed on ioctl */
1195                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1196                         goto out_free_rsp;
1197         }
1198
1199         /* check validate negotiate info response matches what we got earlier */
1200         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1201                 goto vneg_out;
1202
1203         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1204                 goto vneg_out;
1205
1206         /* do not validate server guid because not saved at negprot time yet */
1207
1208         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1209               SMB2_LARGE_FILES) != server->capabilities)
1210                 goto vneg_out;
1211
1212         /* validate negotiate successful */
1213         rc = 0;
1214         cifs_dbg(FYI, "validate negotiate info successful\n");
1215         goto out_free_rsp;
1216
1217 vneg_out:
1218         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1219 out_free_rsp:
1220         kfree(pneg_rsp);
1221 out_free_inbuf:
1222         kfree(pneg_inbuf);
1223         return rc;
1224 }
1225
1226 enum securityEnum
1227 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1228 {
1229         switch (requested) {
1230         case Kerberos:
1231         case RawNTLMSSP:
1232                 return requested;
1233         case NTLMv2:
1234                 return RawNTLMSSP;
1235         case Unspecified:
1236                 if (server->sec_ntlmssp &&
1237                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1238                         return RawNTLMSSP;
1239                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1240                         (global_secflags & CIFSSEC_MAY_KRB5))
1241                         return Kerberos;
1242                 fallthrough;
1243         default:
1244                 return Unspecified;
1245         }
1246 }
1247
1248 struct SMB2_sess_data {
1249         unsigned int xid;
1250         struct cifs_ses *ses;
1251         struct TCP_Server_Info *server;
1252         struct nls_table *nls_cp;
1253         void (*func)(struct SMB2_sess_data *);
1254         int result;
1255         u64 previous_session;
1256
1257         /* we will send the SMB in three pieces:
1258          * a fixed length beginning part, an optional
1259          * SPNEGO blob (which can be zero length), and a
1260          * last part which will include the strings
1261          * and rest of bcc area. This allows us to avoid
1262          * a large buffer 17K allocation
1263          */
1264         int buf0_type;
1265         struct kvec iov[2];
1266 };
1267
1268 static int
1269 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1270 {
1271         int rc;
1272         struct cifs_ses *ses = sess_data->ses;
1273         struct TCP_Server_Info *server = sess_data->server;
1274         struct smb2_sess_setup_req *req;
1275         unsigned int total_len;
1276         bool is_binding = false;
1277
1278         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1279                                  (void **) &req,
1280                                  &total_len);
1281         if (rc)
1282                 return rc;
1283
1284         spin_lock(&ses->ses_lock);
1285         is_binding = (ses->ses_status == SES_GOOD);
1286         spin_unlock(&ses->ses_lock);
1287
1288         if (is_binding) {
1289                 req->hdr.SessionId = cpu_to_le64(ses->Suid);
1290                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1291                 req->PreviousSessionId = 0;
1292                 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1293                 cifs_dbg(FYI, "Binding to sess id: %llx\n", ses->Suid);
1294         } else {
1295                 /* First session, not a reauthenticate */
1296                 req->hdr.SessionId = 0;
1297                 /*
1298                  * if reconnect, we need to send previous sess id
1299                  * otherwise it is 0
1300                  */
1301                 req->PreviousSessionId = cpu_to_le64(sess_data->previous_session);
1302                 req->Flags = 0; /* MBZ */
1303                 cifs_dbg(FYI, "Fresh session. Previous: %llx\n",
1304                          sess_data->previous_session);
1305         }
1306
1307         /* enough to enable echos and oplocks and one max size write */
1308         req->hdr.CreditRequest = cpu_to_le16(130);
1309
1310         /* only one of SMB2 signing flags may be set in SMB2 request */
1311         if (server->sign)
1312                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1313         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1314                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1315         else
1316                 req->SecurityMode = 0;
1317
1318 #ifdef CONFIG_CIFS_DFS_UPCALL
1319         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1320 #else
1321         req->Capabilities = 0;
1322 #endif /* DFS_UPCALL */
1323
1324         req->Channel = 0; /* MBZ */
1325
1326         sess_data->iov[0].iov_base = (char *)req;
1327         /* 1 for pad */
1328         sess_data->iov[0].iov_len = total_len - 1;
1329         /*
1330          * This variable will be used to clear the buffer
1331          * allocated above in case of any error in the calling function.
1332          */
1333         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1334
1335         return 0;
1336 }
1337
1338 static void
1339 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1340 {
1341         struct kvec *iov = sess_data->iov;
1342
1343         /* iov[1] is already freed by caller */
1344         if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
1345                 memzero_explicit(iov[0].iov_base, iov[0].iov_len);
1346
1347         free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
1348         sess_data->buf0_type = CIFS_NO_BUFFER;
1349 }
1350
1351 static int
1352 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1353 {
1354         int rc;
1355         struct smb_rqst rqst;
1356         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1357         struct kvec rsp_iov = { NULL, 0 };
1358
1359         /* Testing shows that buffer offset must be at location of Buffer[0] */
1360         req->SecurityBufferOffset =
1361                 cpu_to_le16(sizeof(struct smb2_sess_setup_req));
1362         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1363
1364         memset(&rqst, 0, sizeof(struct smb_rqst));
1365         rqst.rq_iov = sess_data->iov;
1366         rqst.rq_nvec = 2;
1367
1368         /* BB add code to build os and lm fields */
1369         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1370                             sess_data->server,
1371                             &rqst,
1372                             &sess_data->buf0_type,
1373                             CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);
1374         cifs_small_buf_release(sess_data->iov[0].iov_base);
1375         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1376
1377         return rc;
1378 }
1379
1380 static int
1381 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1382 {
1383         int rc = 0;
1384         struct cifs_ses *ses = sess_data->ses;
1385         struct TCP_Server_Info *server = sess_data->server;
1386
1387         cifs_server_lock(server);
1388         if (server->ops->generate_signingkey) {
1389                 rc = server->ops->generate_signingkey(ses, server);
1390                 if (rc) {
1391                         cifs_dbg(FYI,
1392                                 "SMB3 session key generation failed\n");
1393                         cifs_server_unlock(server);
1394                         return rc;
1395                 }
1396         }
1397         if (!server->session_estab) {
1398                 server->sequence_number = 0x2;
1399                 server->session_estab = true;
1400         }
1401         cifs_server_unlock(server);
1402
1403         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1404         return rc;
1405 }
1406
1407 #ifdef CONFIG_CIFS_UPCALL
1408 static void
1409 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1410 {
1411         int rc;
1412         struct cifs_ses *ses = sess_data->ses;
1413         struct TCP_Server_Info *server = sess_data->server;
1414         struct cifs_spnego_msg *msg;
1415         struct key *spnego_key = NULL;
1416         struct smb2_sess_setup_rsp *rsp = NULL;
1417         bool is_binding = false;
1418
1419         rc = SMB2_sess_alloc_buffer(sess_data);
1420         if (rc)
1421                 goto out;
1422
1423         spnego_key = cifs_get_spnego_key(ses, server);
1424         if (IS_ERR(spnego_key)) {
1425                 rc = PTR_ERR(spnego_key);
1426                 if (rc == -ENOKEY)
1427                         cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1428                 spnego_key = NULL;
1429                 goto out;
1430         }
1431
1432         msg = spnego_key->payload.data[0];
1433         /*
1434          * check version field to make sure that cifs.upcall is
1435          * sending us a response in an expected form
1436          */
1437         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1438                 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1439                          CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1440                 rc = -EKEYREJECTED;
1441                 goto out_put_spnego_key;
1442         }
1443
1444         spin_lock(&ses->ses_lock);
1445         is_binding = (ses->ses_status == SES_GOOD);
1446         spin_unlock(&ses->ses_lock);
1447
1448         /* keep session key if binding */
1449         if (!is_binding) {
1450                 kfree_sensitive(ses->auth_key.response);
1451                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1452                                                  GFP_KERNEL);
1453                 if (!ses->auth_key.response) {
1454                         cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1455                                  msg->sesskey_len);
1456                         rc = -ENOMEM;
1457                         goto out_put_spnego_key;
1458                 }
1459                 ses->auth_key.len = msg->sesskey_len;
1460         }
1461
1462         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1463         sess_data->iov[1].iov_len = msg->secblob_len;
1464
1465         rc = SMB2_sess_sendreceive(sess_data);
1466         if (rc)
1467                 goto out_put_spnego_key;
1468
1469         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1470         /* keep session id and flags if binding */
1471         if (!is_binding) {
1472                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1473                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1474         }
1475
1476         rc = SMB2_sess_establish_session(sess_data);
1477 out_put_spnego_key:
1478         key_invalidate(spnego_key);
1479         key_put(spnego_key);
1480         if (rc) {
1481                 kfree_sensitive(ses->auth_key.response);
1482                 ses->auth_key.response = NULL;
1483                 ses->auth_key.len = 0;
1484         }
1485 out:
1486         sess_data->result = rc;
1487         sess_data->func = NULL;
1488         SMB2_sess_free_buffer(sess_data);
1489 }
1490 #else
1491 static void
1492 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1493 {
1494         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1495         sess_data->result = -EOPNOTSUPP;
1496         sess_data->func = NULL;
1497 }
1498 #endif
1499
1500 static void
1501 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1502
1503 static void
1504 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1505 {
1506         int rc;
1507         struct cifs_ses *ses = sess_data->ses;
1508         struct TCP_Server_Info *server = sess_data->server;
1509         struct smb2_sess_setup_rsp *rsp = NULL;
1510         unsigned char *ntlmssp_blob = NULL;
1511         bool use_spnego = false; /* else use raw ntlmssp */
1512         u16 blob_length = 0;
1513         bool is_binding = false;
1514
1515         /*
1516          * If memory allocation is successful, caller of this function
1517          * frees it.
1518          */
1519         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1520         if (!ses->ntlmssp) {
1521                 rc = -ENOMEM;
1522                 goto out_err;
1523         }
1524         ses->ntlmssp->sesskey_per_smbsess = true;
1525
1526         rc = SMB2_sess_alloc_buffer(sess_data);
1527         if (rc)
1528                 goto out_err;
1529
1530         rc = build_ntlmssp_smb3_negotiate_blob(&ntlmssp_blob,
1531                                           &blob_length, ses, server,
1532                                           sess_data->nls_cp);
1533         if (rc)
1534                 goto out;
1535
1536         if (use_spnego) {
1537                 /* BB eventually need to add this */
1538                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1539                 rc = -EOPNOTSUPP;
1540                 goto out;
1541         }
1542         sess_data->iov[1].iov_base = ntlmssp_blob;
1543         sess_data->iov[1].iov_len = blob_length;
1544
1545         rc = SMB2_sess_sendreceive(sess_data);
1546         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1547
1548         /* If true, rc here is expected and not an error */
1549         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1550                 rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1551                 rc = 0;
1552
1553         if (rc)
1554                 goto out;
1555
1556         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1557                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1558                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1559                         le16_to_cpu(rsp->SecurityBufferOffset));
1560                 rc = -EIO;
1561                 goto out;
1562         }
1563         rc = decode_ntlmssp_challenge(rsp->Buffer,
1564                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1565         if (rc)
1566                 goto out;
1567
1568         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1569
1570         spin_lock(&ses->ses_lock);
1571         is_binding = (ses->ses_status == SES_GOOD);
1572         spin_unlock(&ses->ses_lock);
1573
1574         /* keep existing ses id and flags if binding */
1575         if (!is_binding) {
1576                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1577                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1578         }
1579
1580 out:
1581         kfree_sensitive(ntlmssp_blob);
1582         SMB2_sess_free_buffer(sess_data);
1583         if (!rc) {
1584                 sess_data->result = 0;
1585                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1586                 return;
1587         }
1588 out_err:
1589         kfree_sensitive(ses->ntlmssp);
1590         ses->ntlmssp = NULL;
1591         sess_data->result = rc;
1592         sess_data->func = NULL;
1593 }
1594
1595 static void
1596 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1597 {
1598         int rc;
1599         struct cifs_ses *ses = sess_data->ses;
1600         struct TCP_Server_Info *server = sess_data->server;
1601         struct smb2_sess_setup_req *req;
1602         struct smb2_sess_setup_rsp *rsp = NULL;
1603         unsigned char *ntlmssp_blob = NULL;
1604         bool use_spnego = false; /* else use raw ntlmssp */
1605         u16 blob_length = 0;
1606         bool is_binding = false;
1607
1608         rc = SMB2_sess_alloc_buffer(sess_data);
1609         if (rc)
1610                 goto out;
1611
1612         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1613         req->hdr.SessionId = cpu_to_le64(ses->Suid);
1614
1615         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length,
1616                                      ses, server,
1617                                      sess_data->nls_cp);
1618         if (rc) {
1619                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1620                 goto out;
1621         }
1622
1623         if (use_spnego) {
1624                 /* BB eventually need to add this */
1625                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1626                 rc = -EOPNOTSUPP;
1627                 goto out;
1628         }
1629         sess_data->iov[1].iov_base = ntlmssp_blob;
1630         sess_data->iov[1].iov_len = blob_length;
1631
1632         rc = SMB2_sess_sendreceive(sess_data);
1633         if (rc)
1634                 goto out;
1635
1636         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1637
1638         spin_lock(&ses->ses_lock);
1639         is_binding = (ses->ses_status == SES_GOOD);
1640         spin_unlock(&ses->ses_lock);
1641
1642         /* keep existing ses id and flags if binding */
1643         if (!is_binding) {
1644                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1645                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1646         }
1647
1648         rc = SMB2_sess_establish_session(sess_data);
1649 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1650         if (ses->server->dialect < SMB30_PROT_ID) {
1651                 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1652                 /*
1653                  * The session id is opaque in terms of endianness, so we can't
1654                  * print it as a long long. we dump it as we got it on the wire
1655                  */
1656                 cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1657                          &ses->Suid);
1658                 cifs_dbg(VFS, "Session Key   %*ph\n",
1659                          SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1660                 cifs_dbg(VFS, "Signing Key   %*ph\n",
1661                          SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1662         }
1663 #endif
1664 out:
1665         kfree_sensitive(ntlmssp_blob);
1666         SMB2_sess_free_buffer(sess_data);
1667         kfree_sensitive(ses->ntlmssp);
1668         ses->ntlmssp = NULL;
1669         sess_data->result = rc;
1670         sess_data->func = NULL;
1671 }
1672
1673 static int
1674 SMB2_select_sec(struct SMB2_sess_data *sess_data)
1675 {
1676         int type;
1677         struct cifs_ses *ses = sess_data->ses;
1678         struct TCP_Server_Info *server = sess_data->server;
1679
1680         type = smb2_select_sectype(server, ses->sectype);
1681         cifs_dbg(FYI, "sess setup type %d\n", type);
1682         if (type == Unspecified) {
1683                 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1684                 return -EINVAL;
1685         }
1686
1687         switch (type) {
1688         case Kerberos:
1689                 sess_data->func = SMB2_auth_kerberos;
1690                 break;
1691         case RawNTLMSSP:
1692                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1693                 break;
1694         default:
1695                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1696                 return -EOPNOTSUPP;
1697         }
1698
1699         return 0;
1700 }
1701
1702 int
1703 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1704                 struct TCP_Server_Info *server,
1705                 const struct nls_table *nls_cp)
1706 {
1707         int rc = 0;
1708         struct SMB2_sess_data *sess_data;
1709
1710         cifs_dbg(FYI, "Session Setup\n");
1711
1712         if (!server) {
1713                 WARN(1, "%s: server is NULL!\n", __func__);
1714                 return -EIO;
1715         }
1716
1717         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1718         if (!sess_data)
1719                 return -ENOMEM;
1720
1721         sess_data->xid = xid;
1722         sess_data->ses = ses;
1723         sess_data->server = server;
1724         sess_data->buf0_type = CIFS_NO_BUFFER;
1725         sess_data->nls_cp = (struct nls_table *) nls_cp;
1726         sess_data->previous_session = ses->Suid;
1727
1728         rc = SMB2_select_sec(sess_data);
1729         if (rc)
1730                 goto out;
1731
1732         /*
1733          * Initialize the session hash with the server one.
1734          */
1735         memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1736                SMB2_PREAUTH_HASH_SIZE);
1737
1738         while (sess_data->func)
1739                 sess_data->func(sess_data);
1740
1741         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1742                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1743         rc = sess_data->result;
1744 out:
1745         kfree_sensitive(sess_data);
1746         return rc;
1747 }
1748
1749 int
1750 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1751 {
1752         struct smb_rqst rqst;
1753         struct smb2_logoff_req *req; /* response is also trivial struct */
1754         int rc = 0;
1755         struct TCP_Server_Info *server;
1756         int flags = 0;
1757         unsigned int total_len;
1758         struct kvec iov[1];
1759         struct kvec rsp_iov;
1760         int resp_buf_type;
1761
1762         cifs_dbg(FYI, "disconnect session %p\n", ses);
1763
1764         if (ses && (ses->server))
1765                 server = ses->server;
1766         else
1767                 return -EIO;
1768
1769         /* no need to send SMB logoff if uid already closed due to reconnect */
1770         spin_lock(&ses->chan_lock);
1771         if (CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
1772                 spin_unlock(&ses->chan_lock);
1773                 goto smb2_session_already_dead;
1774         }
1775         spin_unlock(&ses->chan_lock);
1776
1777         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1778                                  (void **) &req, &total_len);
1779         if (rc)
1780                 return rc;
1781
1782          /* since no tcon, smb2_init can not do this, so do here */
1783         req->hdr.SessionId = cpu_to_le64(ses->Suid);
1784
1785         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1786                 flags |= CIFS_TRANSFORM_REQ;
1787         else if (server->sign)
1788                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1789
1790         flags |= CIFS_NO_RSP_BUF;
1791
1792         iov[0].iov_base = (char *)req;
1793         iov[0].iov_len = total_len;
1794
1795         memset(&rqst, 0, sizeof(struct smb_rqst));
1796         rqst.rq_iov = iov;
1797         rqst.rq_nvec = 1;
1798
1799         rc = cifs_send_recv(xid, ses, ses->server,
1800                             &rqst, &resp_buf_type, flags, &rsp_iov);
1801         cifs_small_buf_release(req);
1802         /*
1803          * No tcon so can't do
1804          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1805          */
1806
1807 smb2_session_already_dead:
1808         return rc;
1809 }
1810
1811 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1812 {
1813         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1814 }
1815
1816 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1817
1818 /* These are similar values to what Windows uses */
1819 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1820 {
1821         tcon->max_chunks = 256;
1822         tcon->max_bytes_chunk = 1048576;
1823         tcon->max_bytes_copy = 16777216;
1824 }
1825
1826 int
1827 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1828           struct cifs_tcon *tcon, const struct nls_table *cp)
1829 {
1830         struct smb_rqst rqst;
1831         struct smb2_tree_connect_req *req;
1832         struct smb2_tree_connect_rsp *rsp = NULL;
1833         struct kvec iov[2];
1834         struct kvec rsp_iov = { NULL, 0 };
1835         int rc = 0;
1836         int resp_buftype;
1837         int unc_path_len;
1838         __le16 *unc_path = NULL;
1839         int flags = 0;
1840         unsigned int total_len;
1841         struct TCP_Server_Info *server;
1842
1843         /* always use master channel */
1844         server = ses->server;
1845
1846         cifs_dbg(FYI, "TCON\n");
1847
1848         if (!server || !tree)
1849                 return -EIO;
1850
1851         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1852         if (unc_path == NULL)
1853                 return -ENOMEM;
1854
1855         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp);
1856         if (unc_path_len <= 0) {
1857                 kfree(unc_path);
1858                 return -EINVAL;
1859         }
1860         unc_path_len *= 2;
1861
1862         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1863         tcon->tid = 0;
1864         atomic_set(&tcon->num_remote_opens, 0);
1865         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
1866                                  (void **) &req, &total_len);
1867         if (rc) {
1868                 kfree(unc_path);
1869                 return rc;
1870         }
1871
1872         if (smb3_encryption_required(tcon))
1873                 flags |= CIFS_TRANSFORM_REQ;
1874
1875         iov[0].iov_base = (char *)req;
1876         /* 1 for pad */
1877         iov[0].iov_len = total_len - 1;
1878
1879         /* Testing shows that buffer offset must be at location of Buffer[0] */
1880         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req));
1881         req->PathLength = cpu_to_le16(unc_path_len);
1882         iov[1].iov_base = unc_path;
1883         iov[1].iov_len = unc_path_len;
1884
1885         /*
1886          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1887          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1888          * (Samba servers don't always set the flag so also check if null user)
1889          */
1890         if ((server->dialect == SMB311_PROT_ID) &&
1891             !smb3_encryption_required(tcon) &&
1892             !(ses->session_flags &
1893                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1894             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1895                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1896
1897         memset(&rqst, 0, sizeof(struct smb_rqst));
1898         rqst.rq_iov = iov;
1899         rqst.rq_nvec = 2;
1900
1901         /* Need 64 for max size write so ask for more in case not there yet */
1902         req->hdr.CreditRequest = cpu_to_le16(64);
1903
1904         rc = cifs_send_recv(xid, ses, server,
1905                             &rqst, &resp_buftype, flags, &rsp_iov);
1906         cifs_small_buf_release(req);
1907         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1908         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1909         if ((rc != 0) || (rsp == NULL)) {
1910                 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1911                 tcon->need_reconnect = true;
1912                 goto tcon_error_exit;
1913         }
1914
1915         switch (rsp->ShareType) {
1916         case SMB2_SHARE_TYPE_DISK:
1917                 cifs_dbg(FYI, "connection to disk share\n");
1918                 break;
1919         case SMB2_SHARE_TYPE_PIPE:
1920                 tcon->pipe = true;
1921                 cifs_dbg(FYI, "connection to pipe share\n");
1922                 break;
1923         case SMB2_SHARE_TYPE_PRINT:
1924                 tcon->print = true;
1925                 cifs_dbg(FYI, "connection to printer\n");
1926                 break;
1927         default:
1928                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1929                 rc = -EOPNOTSUPP;
1930                 goto tcon_error_exit;
1931         }
1932
1933         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1934         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1935         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1936         tcon->tid = le32_to_cpu(rsp->hdr.Id.SyncId.TreeId);
1937         strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));
1938
1939         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1940             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1941                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1942
1943         if (tcon->seal &&
1944             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1945                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1946
1947         init_copy_chunk_defaults(tcon);
1948         if (server->ops->validate_negotiate)
1949                 rc = server->ops->validate_negotiate(xid, tcon);
1950         if (rc == 0) /* See MS-SMB2 2.2.10 and 3.2.5.5 */
1951                 if (tcon->share_flags & SMB2_SHAREFLAG_ISOLATED_TRANSPORT)
1952                         server->nosharesock = true;
1953 tcon_exit:
1954
1955         free_rsp_buf(resp_buftype, rsp);
1956         kfree(unc_path);
1957         return rc;
1958
1959 tcon_error_exit:
1960         if (rsp && rsp->hdr.Status == STATUS_BAD_NETWORK_NAME)
1961                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1962         goto tcon_exit;
1963 }
1964
1965 int
1966 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1967 {
1968         struct smb_rqst rqst;
1969         struct smb2_tree_disconnect_req *req; /* response is trivial */
1970         int rc = 0;
1971         struct cifs_ses *ses = tcon->ses;
1972         int flags = 0;
1973         unsigned int total_len;
1974         struct kvec iov[1];
1975         struct kvec rsp_iov;
1976         int resp_buf_type;
1977
1978         cifs_dbg(FYI, "Tree Disconnect\n");
1979
1980         if (!ses || !(ses->server))
1981                 return -EIO;
1982
1983         trace_smb3_tdis_enter(xid, tcon->tid, ses->Suid, tcon->tree_name);
1984         spin_lock(&ses->chan_lock);
1985         if ((tcon->need_reconnect) ||
1986             (CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses))) {
1987                 spin_unlock(&ses->chan_lock);
1988                 return 0;
1989         }
1990         spin_unlock(&ses->chan_lock);
1991
1992         invalidate_all_cached_dirs(tcon);
1993
1994         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
1995                                  (void **) &req,
1996                                  &total_len);
1997         if (rc)
1998                 return rc;
1999
2000         if (smb3_encryption_required(tcon))
2001                 flags |= CIFS_TRANSFORM_REQ;
2002
2003         flags |= CIFS_NO_RSP_BUF;
2004
2005         iov[0].iov_base = (char *)req;
2006         iov[0].iov_len = total_len;
2007
2008         memset(&rqst, 0, sizeof(struct smb_rqst));
2009         rqst.rq_iov = iov;
2010         rqst.rq_nvec = 1;
2011
2012         rc = cifs_send_recv(xid, ses, ses->server,
2013                             &rqst, &resp_buf_type, flags, &rsp_iov);
2014         cifs_small_buf_release(req);
2015         if (rc) {
2016                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
2017                 trace_smb3_tdis_err(xid, tcon->tid, ses->Suid, rc);
2018         }
2019         trace_smb3_tdis_done(xid, tcon->tid, ses->Suid);
2020
2021         return rc;
2022 }
2023
2024
2025 static struct create_durable *
2026 create_durable_buf(void)
2027 {
2028         struct create_durable *buf;
2029
2030         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2031         if (!buf)
2032                 return NULL;
2033
2034         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2035                                         (struct create_durable, Data));
2036         buf->ccontext.DataLength = cpu_to_le32(16);
2037         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2038                                 (struct create_durable, Name));
2039         buf->ccontext.NameLength = cpu_to_le16(4);
2040         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
2041         buf->Name[0] = 'D';
2042         buf->Name[1] = 'H';
2043         buf->Name[2] = 'n';
2044         buf->Name[3] = 'Q';
2045         return buf;
2046 }
2047
2048 static struct create_durable *
2049 create_reconnect_durable_buf(struct cifs_fid *fid)
2050 {
2051         struct create_durable *buf;
2052
2053         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2054         if (!buf)
2055                 return NULL;
2056
2057         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2058                                         (struct create_durable, Data));
2059         buf->ccontext.DataLength = cpu_to_le32(16);
2060         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2061                                 (struct create_durable, Name));
2062         buf->ccontext.NameLength = cpu_to_le16(4);
2063         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
2064         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
2065         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
2066         buf->Name[0] = 'D';
2067         buf->Name[1] = 'H';
2068         buf->Name[2] = 'n';
2069         buf->Name[3] = 'C';
2070         return buf;
2071 }
2072
2073 static void
2074 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
2075 {
2076         struct create_disk_id_rsp *pdisk_id = (struct create_disk_id_rsp *)cc;
2077
2078         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
2079                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
2080         buf->IndexNumber = pdisk_id->DiskFileId;
2081 }
2082
2083 static void
2084 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
2085                  struct create_posix_rsp *posix)
2086 {
2087         int sid_len;
2088         u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
2089         u8 *end = beg + le32_to_cpu(cc->DataLength);
2090         u8 *sid;
2091
2092         memset(posix, 0, sizeof(*posix));
2093
2094         posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
2095         posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
2096         posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
2097
2098         sid = beg + 12;
2099         sid_len = posix_info_sid_size(sid, end);
2100         if (sid_len < 0) {
2101                 cifs_dbg(VFS, "bad owner sid in posix create response\n");
2102                 return;
2103         }
2104         memcpy(&posix->owner, sid, sid_len);
2105
2106         sid = sid + sid_len;
2107         sid_len = posix_info_sid_size(sid, end);
2108         if (sid_len < 0) {
2109                 cifs_dbg(VFS, "bad group sid in posix create response\n");
2110                 return;
2111         }
2112         memcpy(&posix->group, sid, sid_len);
2113
2114         cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
2115                  posix->nlink, posix->mode, posix->reparse_tag);
2116 }
2117
2118 void
2119 smb2_parse_contexts(struct TCP_Server_Info *server,
2120                     struct smb2_create_rsp *rsp,
2121                     unsigned int *epoch, char *lease_key, __u8 *oplock,
2122                     struct smb2_file_all_info *buf,
2123                     struct create_posix_rsp *posix)
2124 {
2125         char *data_offset;
2126         struct create_context *cc;
2127         unsigned int next;
2128         unsigned int remaining;
2129         char *name;
2130         static const char smb3_create_tag_posix[] = {
2131                 0x93, 0xAD, 0x25, 0x50, 0x9C,
2132                 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2133                 0xDE, 0x96, 0x8B, 0xCD, 0x7C
2134         };
2135
2136         *oplock = 0;
2137         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
2138         remaining = le32_to_cpu(rsp->CreateContextsLength);
2139         cc = (struct create_context *)data_offset;
2140
2141         /* Initialize inode number to 0 in case no valid data in qfid context */
2142         if (buf)
2143                 buf->IndexNumber = 0;
2144
2145         while (remaining >= sizeof(struct create_context)) {
2146                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
2147                 if (le16_to_cpu(cc->NameLength) == 4 &&
2148                     strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
2149                         *oplock = server->ops->parse_lease_buf(cc, epoch,
2150                                                            lease_key);
2151                 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
2152                     strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
2153                         parse_query_id_ctxt(cc, buf);
2154                 else if ((le16_to_cpu(cc->NameLength) == 16)) {
2155                         if (posix &&
2156                             memcmp(name, smb3_create_tag_posix, 16) == 0)
2157                                 parse_posix_ctxt(cc, buf, posix);
2158                 }
2159                 /* else {
2160                         cifs_dbg(FYI, "Context not matched with len %d\n",
2161                                 le16_to_cpu(cc->NameLength));
2162                         cifs_dump_mem("Cctxt name: ", name, 4);
2163                 } */
2164
2165                 next = le32_to_cpu(cc->Next);
2166                 if (!next)
2167                         break;
2168                 remaining -= next;
2169                 cc = (struct create_context *)((char *)cc + next);
2170         }
2171
2172         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2173                 *oplock = rsp->OplockLevel;
2174
2175         return;
2176 }
2177
2178 static int
2179 add_lease_context(struct TCP_Server_Info *server,
2180                   struct smb2_create_req *req,
2181                   struct kvec *iov,
2182                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2183 {
2184         unsigned int num = *num_iovec;
2185
2186         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2187         if (iov[num].iov_base == NULL)
2188                 return -ENOMEM;
2189         iov[num].iov_len = server->vals->create_lease_size;
2190         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2191         *num_iovec = num + 1;
2192         return 0;
2193 }
2194
2195 static struct create_durable_v2 *
2196 create_durable_v2_buf(struct cifs_open_parms *oparms)
2197 {
2198         struct cifs_fid *pfid = oparms->fid;
2199         struct create_durable_v2 *buf;
2200
2201         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2202         if (!buf)
2203                 return NULL;
2204
2205         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2206                                         (struct create_durable_v2, dcontext));
2207         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2208         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2209                                 (struct create_durable_v2, Name));
2210         buf->ccontext.NameLength = cpu_to_le16(4);
2211
2212         /*
2213          * NB: Handle timeout defaults to 0, which allows server to choose
2214          * (most servers default to 120 seconds) and most clients default to 0.
2215          * This can be overridden at mount ("handletimeout=") if the user wants
2216          * a different persistent (or resilient) handle timeout for all opens
2217          * opens on a particular SMB3 mount.
2218          */
2219         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2220         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2221         generate_random_uuid(buf->dcontext.CreateGuid);
2222         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2223
2224         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2225         buf->Name[0] = 'D';
2226         buf->Name[1] = 'H';
2227         buf->Name[2] = '2';
2228         buf->Name[3] = 'Q';
2229         return buf;
2230 }
2231
2232 static struct create_durable_handle_reconnect_v2 *
2233 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2234 {
2235         struct create_durable_handle_reconnect_v2 *buf;
2236
2237         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2238                         GFP_KERNEL);
2239         if (!buf)
2240                 return NULL;
2241
2242         buf->ccontext.DataOffset =
2243                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2244                                      dcontext));
2245         buf->ccontext.DataLength =
2246                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2247         buf->ccontext.NameOffset =
2248                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2249                             Name));
2250         buf->ccontext.NameLength = cpu_to_le16(4);
2251
2252         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2253         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2254         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2255         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2256
2257         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2258         buf->Name[0] = 'D';
2259         buf->Name[1] = 'H';
2260         buf->Name[2] = '2';
2261         buf->Name[3] = 'C';
2262         return buf;
2263 }
2264
2265 static int
2266 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2267                     struct cifs_open_parms *oparms)
2268 {
2269         unsigned int num = *num_iovec;
2270
2271         iov[num].iov_base = create_durable_v2_buf(oparms);
2272         if (iov[num].iov_base == NULL)
2273                 return -ENOMEM;
2274         iov[num].iov_len = sizeof(struct create_durable_v2);
2275         *num_iovec = num + 1;
2276         return 0;
2277 }
2278
2279 static int
2280 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2281                     struct cifs_open_parms *oparms)
2282 {
2283         unsigned int num = *num_iovec;
2284
2285         /* indicate that we don't need to relock the file */
2286         oparms->reconnect = false;
2287
2288         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2289         if (iov[num].iov_base == NULL)
2290                 return -ENOMEM;
2291         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2292         *num_iovec = num + 1;
2293         return 0;
2294 }
2295
2296 static int
2297 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2298                     struct cifs_open_parms *oparms, bool use_persistent)
2299 {
2300         unsigned int num = *num_iovec;
2301
2302         if (use_persistent) {
2303                 if (oparms->reconnect)
2304                         return add_durable_reconnect_v2_context(iov, num_iovec,
2305                                                                 oparms);
2306                 else
2307                         return add_durable_v2_context(iov, num_iovec, oparms);
2308         }
2309
2310         if (oparms->reconnect) {
2311                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2312                 /* indicate that we don't need to relock the file */
2313                 oparms->reconnect = false;
2314         } else
2315                 iov[num].iov_base = create_durable_buf();
2316         if (iov[num].iov_base == NULL)
2317                 return -ENOMEM;
2318         iov[num].iov_len = sizeof(struct create_durable);
2319         *num_iovec = num + 1;
2320         return 0;
2321 }
2322
2323 /* See MS-SMB2 2.2.13.2.7 */
2324 static struct crt_twarp_ctxt *
2325 create_twarp_buf(__u64 timewarp)
2326 {
2327         struct crt_twarp_ctxt *buf;
2328
2329         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2330         if (!buf)
2331                 return NULL;
2332
2333         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2334                                         (struct crt_twarp_ctxt, Timestamp));
2335         buf->ccontext.DataLength = cpu_to_le32(8);
2336         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2337                                 (struct crt_twarp_ctxt, Name));
2338         buf->ccontext.NameLength = cpu_to_le16(4);
2339         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2340         buf->Name[0] = 'T';
2341         buf->Name[1] = 'W';
2342         buf->Name[2] = 'r';
2343         buf->Name[3] = 'p';
2344         buf->Timestamp = cpu_to_le64(timewarp);
2345         return buf;
2346 }
2347
2348 /* See MS-SMB2 2.2.13.2.7 */
2349 static int
2350 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2351 {
2352         unsigned int num = *num_iovec;
2353
2354         iov[num].iov_base = create_twarp_buf(timewarp);
2355         if (iov[num].iov_base == NULL)
2356                 return -ENOMEM;
2357         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2358         *num_iovec = num + 1;
2359         return 0;
2360 }
2361
2362 /* See See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2363 static void setup_owner_group_sids(char *buf)
2364 {
2365         struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2366
2367         /* Populate the user ownership fields S-1-5-88-1 */
2368         sids->owner.Revision = 1;
2369         sids->owner.NumAuth = 3;
2370         sids->owner.Authority[5] = 5;
2371         sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2372         sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2373         sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2374
2375         /* Populate the group ownership fields S-1-5-88-2 */
2376         sids->group.Revision = 1;
2377         sids->group.NumAuth = 3;
2378         sids->group.Authority[5] = 5;
2379         sids->group.SubAuthorities[0] = cpu_to_le32(88);
2380         sids->group.SubAuthorities[1] = cpu_to_le32(2);
2381         sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2382
2383         cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2384 }
2385
2386 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2387 static struct crt_sd_ctxt *
2388 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2389 {
2390         struct crt_sd_ctxt *buf;
2391         __u8 *ptr, *aclptr;
2392         unsigned int acelen, acl_size, ace_count;
2393         unsigned int owner_offset = 0;
2394         unsigned int group_offset = 0;
2395         struct smb3_acl acl = {};
2396
2397         *len = round_up(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
2398
2399         if (set_owner) {
2400                 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2401                 *len += sizeof(struct owner_group_sids);
2402         }
2403
2404         buf = kzalloc(*len, GFP_KERNEL);
2405         if (buf == NULL)
2406                 return buf;
2407
2408         ptr = (__u8 *)&buf[1];
2409         if (set_owner) {
2410                 /* offset fields are from beginning of security descriptor not of create context */
2411                 owner_offset = ptr - (__u8 *)&buf->sd;
2412                 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2413                 group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2414                 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2415
2416                 setup_owner_group_sids(ptr);
2417                 ptr += sizeof(struct owner_group_sids);
2418         } else {
2419                 buf->sd.OffsetOwner = 0;
2420                 buf->sd.OffsetGroup = 0;
2421         }
2422
2423         buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2424         buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2425         buf->ccontext.NameLength = cpu_to_le16(4);
2426         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2427         buf->Name[0] = 'S';
2428         buf->Name[1] = 'e';
2429         buf->Name[2] = 'c';
2430         buf->Name[3] = 'D';
2431         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2432
2433         /*
2434          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2435          * and "DP" ie the DACL is present
2436          */
2437         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2438
2439         /* offset owner, group and Sbz1 and SACL are all zero */
2440         buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2441         /* Ship the ACL for now. we will copy it into buf later. */
2442         aclptr = ptr;
2443         ptr += sizeof(struct smb3_acl);
2444
2445         /* create one ACE to hold the mode embedded in reserved special SID */
2446         acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode);
2447         ptr += acelen;
2448         acl_size = acelen + sizeof(struct smb3_acl);
2449         ace_count = 1;
2450
2451         if (set_owner) {
2452                 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2453                 acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr);
2454                 ptr += acelen;
2455                 acl_size += acelen;
2456                 ace_count += 1;
2457         }
2458
2459         /* and one more ACE to allow access for authenticated users */
2460         acelen = setup_authusers_ACE((struct cifs_ace *)ptr);
2461         ptr += acelen;
2462         acl_size += acelen;
2463         ace_count += 1;
2464
2465         acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2466         acl.AclSize = cpu_to_le16(acl_size);
2467         acl.AceCount = cpu_to_le16(ace_count);
2468         /* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */
2469         memcpy(aclptr, &acl, sizeof(struct smb3_acl));
2470
2471         buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2472         *len = round_up((unsigned int)(ptr - (__u8 *)buf), 8);
2473
2474         return buf;
2475 }
2476
2477 static int
2478 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2479 {
2480         unsigned int num = *num_iovec;
2481         unsigned int len = 0;
2482
2483         iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2484         if (iov[num].iov_base == NULL)
2485                 return -ENOMEM;
2486         iov[num].iov_len = len;
2487         *num_iovec = num + 1;
2488         return 0;
2489 }
2490
2491 static struct crt_query_id_ctxt *
2492 create_query_id_buf(void)
2493 {
2494         struct crt_query_id_ctxt *buf;
2495
2496         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2497         if (!buf)
2498                 return NULL;
2499
2500         buf->ccontext.DataOffset = cpu_to_le16(0);
2501         buf->ccontext.DataLength = cpu_to_le32(0);
2502         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2503                                 (struct crt_query_id_ctxt, Name));
2504         buf->ccontext.NameLength = cpu_to_le16(4);
2505         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2506         buf->Name[0] = 'Q';
2507         buf->Name[1] = 'F';
2508         buf->Name[2] = 'i';
2509         buf->Name[3] = 'd';
2510         return buf;
2511 }
2512
2513 /* See MS-SMB2 2.2.13.2.9 */
2514 static int
2515 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2516 {
2517         unsigned int num = *num_iovec;
2518
2519         iov[num].iov_base = create_query_id_buf();
2520         if (iov[num].iov_base == NULL)
2521                 return -ENOMEM;
2522         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2523         *num_iovec = num + 1;
2524         return 0;
2525 }
2526
2527 static int
2528 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2529                             const char *treename, const __le16 *path)
2530 {
2531         int treename_len, path_len;
2532         struct nls_table *cp;
2533         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2534
2535         /*
2536          * skip leading "\\"
2537          */
2538         treename_len = strlen(treename);
2539         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2540                 return -EINVAL;
2541
2542         treename += 2;
2543         treename_len -= 2;
2544
2545         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2546
2547         /* make room for one path separator only if @path isn't empty */
2548         *out_len = treename_len + (path[0] ? 1 : 0) + path_len;
2549
2550         /*
2551          * final path needs to be 8-byte aligned as specified in
2552          * MS-SMB2 2.2.13 SMB2 CREATE Request.
2553          */
2554         *out_size = round_up(*out_len * sizeof(__le16), 8);
2555         *out_path = kzalloc(*out_size + sizeof(__le16) /* null */, GFP_KERNEL);
2556         if (!*out_path)
2557                 return -ENOMEM;
2558
2559         cp = load_nls_default();
2560         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2561
2562         /* Do not append the separator if the path is empty */
2563         if (path[0] != cpu_to_le16(0x0000)) {
2564                 UniStrcat(*out_path, sep);
2565                 UniStrcat(*out_path, path);
2566         }
2567
2568         unload_nls(cp);
2569
2570         return 0;
2571 }
2572
2573 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2574                                umode_t mode, struct cifs_tcon *tcon,
2575                                const char *full_path,
2576                                struct cifs_sb_info *cifs_sb)
2577 {
2578         struct smb_rqst rqst;
2579         struct smb2_create_req *req;
2580         struct smb2_create_rsp *rsp = NULL;
2581         struct cifs_ses *ses = tcon->ses;
2582         struct kvec iov[3]; /* make sure at least one for each open context */
2583         struct kvec rsp_iov = {NULL, 0};
2584         int resp_buftype;
2585         int uni_path_len;
2586         __le16 *copy_path = NULL;
2587         int copy_size;
2588         int rc = 0;
2589         unsigned int n_iov = 2;
2590         __u32 file_attributes = 0;
2591         char *pc_buf = NULL;
2592         int flags = 0;
2593         unsigned int total_len;
2594         __le16 *utf16_path = NULL;
2595         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2596
2597         cifs_dbg(FYI, "mkdir\n");
2598
2599         /* resource #1: path allocation */
2600         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2601         if (!utf16_path)
2602                 return -ENOMEM;
2603
2604         if (!ses || !server) {
2605                 rc = -EIO;
2606                 goto err_free_path;
2607         }
2608
2609         /* resource #2: request */
2610         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2611                                  (void **) &req, &total_len);
2612         if (rc)
2613                 goto err_free_path;
2614
2615
2616         if (smb3_encryption_required(tcon))
2617                 flags |= CIFS_TRANSFORM_REQ;
2618
2619         req->ImpersonationLevel = IL_IMPERSONATION;
2620         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2621         /* File attributes ignored on open (used in create though) */
2622         req->FileAttributes = cpu_to_le32(file_attributes);
2623         req->ShareAccess = FILE_SHARE_ALL_LE;
2624         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2625         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2626
2627         iov[0].iov_base = (char *)req;
2628         /* -1 since last byte is buf[0] which is sent below (path) */
2629         iov[0].iov_len = total_len - 1;
2630
2631         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2632
2633         /* [MS-SMB2] 2.2.13 NameOffset:
2634          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2635          * the SMB2 header, the file name includes a prefix that will
2636          * be processed during DFS name normalization as specified in
2637          * section 3.3.5.9. Otherwise, the file name is relative to
2638          * the share that is identified by the TreeId in the SMB2
2639          * header.
2640          */
2641         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2642                 int name_len;
2643
2644                 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2645                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2646                                                  &name_len,
2647                                                  tcon->tree_name, utf16_path);
2648                 if (rc)
2649                         goto err_free_req;
2650
2651                 req->NameLength = cpu_to_le16(name_len * 2);
2652                 uni_path_len = copy_size;
2653                 /* free before overwriting resource */
2654                 kfree(utf16_path);
2655                 utf16_path = copy_path;
2656         } else {
2657                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2658                 /* MUST set path len (NameLength) to 0 opening root of share */
2659                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2660                 if (uni_path_len % 8 != 0) {
2661                         copy_size = roundup(uni_path_len, 8);
2662                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2663                         if (!copy_path) {
2664                                 rc = -ENOMEM;
2665                                 goto err_free_req;
2666                         }
2667                         memcpy((char *)copy_path, (const char *)utf16_path,
2668                                uni_path_len);
2669                         uni_path_len = copy_size;
2670                         /* free before overwriting resource */
2671                         kfree(utf16_path);
2672                         utf16_path = copy_path;
2673                 }
2674         }
2675
2676         iov[1].iov_len = uni_path_len;
2677         iov[1].iov_base = utf16_path;
2678         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2679
2680         if (tcon->posix_extensions) {
2681                 /* resource #3: posix buf */
2682                 rc = add_posix_context(iov, &n_iov, mode);
2683                 if (rc)
2684                         goto err_free_req;
2685                 req->CreateContextsOffset = cpu_to_le32(
2686                         sizeof(struct smb2_create_req) +
2687                         iov[1].iov_len);
2688                 pc_buf = iov[n_iov-1].iov_base;
2689         }
2690
2691
2692         memset(&rqst, 0, sizeof(struct smb_rqst));
2693         rqst.rq_iov = iov;
2694         rqst.rq_nvec = n_iov;
2695
2696         /* no need to inc num_remote_opens because we close it just below */
2697         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, full_path, CREATE_NOT_FILE,
2698                                     FILE_WRITE_ATTRIBUTES);
2699         /* resource #4: response buffer */
2700         rc = cifs_send_recv(xid, ses, server,
2701                             &rqst, &resp_buftype, flags, &rsp_iov);
2702         if (rc) {
2703                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2704                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2705                                            CREATE_NOT_FILE,
2706                                            FILE_WRITE_ATTRIBUTES, rc);
2707                 goto err_free_rsp_buf;
2708         }
2709
2710         /*
2711          * Although unlikely to be possible for rsp to be null and rc not set,
2712          * adding check below is slightly safer long term (and quiets Coverity
2713          * warning)
2714          */
2715         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2716         if (rsp == NULL) {
2717                 rc = -EIO;
2718                 kfree(pc_buf);
2719                 goto err_free_req;
2720         }
2721
2722         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
2723                                     CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES);
2724
2725         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2726
2727         /* Eventually save off posix specific response info and timestaps */
2728
2729 err_free_rsp_buf:
2730         free_rsp_buf(resp_buftype, rsp);
2731         kfree(pc_buf);
2732 err_free_req:
2733         cifs_small_buf_release(req);
2734 err_free_path:
2735         kfree(utf16_path);
2736         return rc;
2737 }
2738
2739 int
2740 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2741                struct smb_rqst *rqst, __u8 *oplock,
2742                struct cifs_open_parms *oparms, __le16 *path)
2743 {
2744         struct smb2_create_req *req;
2745         unsigned int n_iov = 2;
2746         __u32 file_attributes = 0;
2747         int copy_size;
2748         int uni_path_len;
2749         unsigned int total_len;
2750         struct kvec *iov = rqst->rq_iov;
2751         __le16 *copy_path;
2752         int rc;
2753
2754         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2755                                  (void **) &req, &total_len);
2756         if (rc)
2757                 return rc;
2758
2759         iov[0].iov_base = (char *)req;
2760         /* -1 since last byte is buf[0] which is sent below (path) */
2761         iov[0].iov_len = total_len - 1;
2762
2763         if (oparms->create_options & CREATE_OPTION_READONLY)
2764                 file_attributes |= ATTR_READONLY;
2765         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2766                 file_attributes |= ATTR_SYSTEM;
2767
2768         req->ImpersonationLevel = IL_IMPERSONATION;
2769         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2770         /* File attributes ignored on open (used in create though) */
2771         req->FileAttributes = cpu_to_le32(file_attributes);
2772         req->ShareAccess = FILE_SHARE_ALL_LE;
2773
2774         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2775         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2776         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2777
2778         /* [MS-SMB2] 2.2.13 NameOffset:
2779          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2780          * the SMB2 header, the file name includes a prefix that will
2781          * be processed during DFS name normalization as specified in
2782          * section 3.3.5.9. Otherwise, the file name is relative to
2783          * the share that is identified by the TreeId in the SMB2
2784          * header.
2785          */
2786         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2787                 int name_len;
2788
2789                 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2790                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2791                                                  &name_len,
2792                                                  tcon->tree_name, path);
2793                 if (rc)
2794                         return rc;
2795                 req->NameLength = cpu_to_le16(name_len * 2);
2796                 uni_path_len = copy_size;
2797                 path = copy_path;
2798         } else {
2799                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2800                 /* MUST set path len (NameLength) to 0 opening root of share */
2801                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2802                 copy_size = round_up(uni_path_len, 8);
2803                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2804                 if (!copy_path)
2805                         return -ENOMEM;
2806                 memcpy((char *)copy_path, (const char *)path,
2807                        uni_path_len);
2808                 uni_path_len = copy_size;
2809                 path = copy_path;
2810         }
2811
2812         iov[1].iov_len = uni_path_len;
2813         iov[1].iov_base = path;
2814
2815         if ((!server->oplocks) || (tcon->no_lease))
2816                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2817
2818         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2819             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2820                 req->RequestedOplockLevel = *oplock;
2821         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2822                   (oparms->create_options & CREATE_NOT_FILE))
2823                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2824         else {
2825                 rc = add_lease_context(server, req, iov, &n_iov,
2826                                        oparms->fid->lease_key, oplock);
2827                 if (rc)
2828                         return rc;
2829         }
2830
2831         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2832                 rc = add_durable_context(iov, &n_iov, oparms,
2833                                         tcon->use_persistent);
2834                 if (rc)
2835                         return rc;
2836         }
2837
2838         if (tcon->posix_extensions) {
2839                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2840                 if (rc)
2841                         return rc;
2842         }
2843
2844         if (tcon->snapshot_time) {
2845                 cifs_dbg(FYI, "adding snapshot context\n");
2846                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2847                 if (rc)
2848                         return rc;
2849         }
2850
2851         if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
2852                 bool set_mode;
2853                 bool set_owner;
2854
2855                 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2856                     (oparms->mode != ACL_NO_MODE))
2857                         set_mode = true;
2858                 else {
2859                         set_mode = false;
2860                         oparms->mode = ACL_NO_MODE;
2861                 }
2862
2863                 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
2864                         set_owner = true;
2865                 else
2866                         set_owner = false;
2867
2868                 if (set_owner | set_mode) {
2869                         cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2870                         rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
2871                         if (rc)
2872                                 return rc;
2873                 }
2874         }
2875
2876         add_query_id_context(iov, &n_iov);
2877
2878         if (n_iov > 2) {
2879                 /*
2880                  * We have create contexts behind iov[1] (the file
2881                  * name), point at them from the main create request
2882                  */
2883                 req->CreateContextsOffset = cpu_to_le32(
2884                         sizeof(struct smb2_create_req) +
2885                         iov[1].iov_len);
2886                 req->CreateContextsLength = 0;
2887
2888                 for (unsigned int i = 2; i < (n_iov-1); i++) {
2889                         struct kvec *v = &iov[i];
2890                         size_t len = v->iov_len;
2891                         struct create_context *cctx =
2892                                 (struct create_context *)v->iov_base;
2893
2894                         cctx->Next = cpu_to_le32(len);
2895                         le32_add_cpu(&req->CreateContextsLength, len);
2896                 }
2897                 le32_add_cpu(&req->CreateContextsLength,
2898                              iov[n_iov-1].iov_len);
2899         }
2900
2901         rqst->rq_nvec = n_iov;
2902         return 0;
2903 }
2904
2905 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2906  * All other vectors are freed by kfree().
2907  */
2908 void
2909 SMB2_open_free(struct smb_rqst *rqst)
2910 {
2911         int i;
2912
2913         if (rqst && rqst->rq_iov) {
2914                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2915                 for (i = 1; i < rqst->rq_nvec; i++)
2916                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2917                                 kfree(rqst->rq_iov[i].iov_base);
2918         }
2919 }
2920
2921 int
2922 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2923           __u8 *oplock, struct smb2_file_all_info *buf,
2924           struct create_posix_rsp *posix,
2925           struct kvec *err_iov, int *buftype)
2926 {
2927         struct smb_rqst rqst;
2928         struct smb2_create_rsp *rsp = NULL;
2929         struct cifs_tcon *tcon = oparms->tcon;
2930         struct cifs_ses *ses = tcon->ses;
2931         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2932         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2933         struct kvec rsp_iov = {NULL, 0};
2934         int resp_buftype = CIFS_NO_BUFFER;
2935         int rc = 0;
2936         int flags = 0;
2937
2938         cifs_dbg(FYI, "create/open\n");
2939         if (!ses || !server)
2940                 return -EIO;
2941
2942         if (smb3_encryption_required(tcon))
2943                 flags |= CIFS_TRANSFORM_REQ;
2944
2945         memset(&rqst, 0, sizeof(struct smb_rqst));
2946         memset(&iov, 0, sizeof(iov));
2947         rqst.rq_iov = iov;
2948         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2949
2950         rc = SMB2_open_init(tcon, server,
2951                             &rqst, oplock, oparms, path);
2952         if (rc)
2953                 goto creat_exit;
2954
2955         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid, oparms->path,
2956                 oparms->create_options, oparms->desired_access);
2957
2958         rc = cifs_send_recv(xid, ses, server,
2959                             &rqst, &resp_buftype, flags,
2960                             &rsp_iov);
2961         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2962
2963         if (rc != 0) {
2964                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2965                 if (err_iov && rsp) {
2966                         *err_iov = rsp_iov;
2967                         *buftype = resp_buftype;
2968                         resp_buftype = CIFS_NO_BUFFER;
2969                         rsp = NULL;
2970                 }
2971                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2972                                     oparms->create_options, oparms->desired_access, rc);
2973                 if (rc == -EREMCHG) {
2974                         pr_warn_once("server share %s deleted\n",
2975                                      tcon->tree_name);
2976                         tcon->need_reconnect = true;
2977                 }
2978                 goto creat_exit;
2979         } else if (rsp == NULL) /* unlikely to happen, but safer to check */
2980                 goto creat_exit;
2981         else
2982                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
2983                                      oparms->create_options, oparms->desired_access);
2984
2985         atomic_inc(&tcon->num_remote_opens);
2986         oparms->fid->persistent_fid = rsp->PersistentFileId;
2987         oparms->fid->volatile_fid = rsp->VolatileFileId;
2988         oparms->fid->access = oparms->desired_access;
2989 #ifdef CONFIG_CIFS_DEBUG2
2990         oparms->fid->mid = le64_to_cpu(rsp->hdr.MessageId);
2991 #endif /* CIFS_DEBUG2 */
2992
2993         if (buf) {
2994                 buf->CreationTime = rsp->CreationTime;
2995                 buf->LastAccessTime = rsp->LastAccessTime;
2996                 buf->LastWriteTime = rsp->LastWriteTime;
2997                 buf->ChangeTime = rsp->ChangeTime;
2998                 buf->AllocationSize = rsp->AllocationSize;
2999                 buf->EndOfFile = rsp->EndofFile;
3000                 buf->Attributes = rsp->FileAttributes;
3001                 buf->NumberOfLinks = cpu_to_le32(1);
3002                 buf->DeletePending = 0;
3003         }
3004
3005
3006         smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
3007                             oparms->fid->lease_key, oplock, buf, posix);
3008 creat_exit:
3009         SMB2_open_free(&rqst);
3010         free_rsp_buf(resp_buftype, rsp);
3011         return rc;
3012 }
3013
3014 int
3015 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3016                 struct smb_rqst *rqst,
3017                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
3018                 char *in_data, u32 indatalen,
3019                 __u32 max_response_size)
3020 {
3021         struct smb2_ioctl_req *req;
3022         struct kvec *iov = rqst->rq_iov;
3023         unsigned int total_len;
3024         int rc;
3025         char *in_data_buf;
3026
3027         rc = smb2_ioctl_req_init(opcode, tcon, server,
3028                                  (void **) &req, &total_len);
3029         if (rc)
3030                 return rc;
3031
3032         if (indatalen) {
3033                 /*
3034                  * indatalen is usually small at a couple of bytes max, so
3035                  * just allocate through generic pool
3036                  */
3037                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
3038                 if (!in_data_buf) {
3039                         cifs_small_buf_release(req);
3040                         return -ENOMEM;
3041                 }
3042         }
3043
3044         req->CtlCode = cpu_to_le32(opcode);
3045         req->PersistentFileId = persistent_fid;
3046         req->VolatileFileId = volatile_fid;
3047
3048         iov[0].iov_base = (char *)req;
3049         /*
3050          * If no input data, the size of ioctl struct in
3051          * protocol spec still includes a 1 byte data buffer,
3052          * but if input data passed to ioctl, we do not
3053          * want to double count this, so we do not send
3054          * the dummy one byte of data in iovec[0] if sending
3055          * input data (in iovec[1]).
3056          */
3057         if (indatalen) {
3058                 req->InputCount = cpu_to_le32(indatalen);
3059                 /* do not set InputOffset if no input data */
3060                 req->InputOffset =
3061                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
3062                 rqst->rq_nvec = 2;
3063                 iov[0].iov_len = total_len - 1;
3064                 iov[1].iov_base = in_data_buf;
3065                 iov[1].iov_len = indatalen;
3066         } else {
3067                 rqst->rq_nvec = 1;
3068                 iov[0].iov_len = total_len;
3069         }
3070
3071         req->OutputOffset = 0;
3072         req->OutputCount = 0; /* MBZ */
3073
3074         /*
3075          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
3076          * We Could increase default MaxOutputResponse, but that could require
3077          * more credits. Windows typically sets this smaller, but for some
3078          * ioctls it may be useful to allow server to send more. No point
3079          * limiting what the server can send as long as fits in one credit
3080          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
3081          * to increase this limit up in the future.
3082          * Note that for snapshot queries that servers like Azure expect that
3083          * the first query be minimal size (and just used to get the number/size
3084          * of previous versions) so response size must be specified as EXACTLY
3085          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
3086          * of eight bytes.  Currently that is the only case where we set max
3087          * response size smaller.
3088          */
3089         req->MaxOutputResponse = cpu_to_le32(max_response_size);
3090         req->hdr.CreditCharge =
3091                 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
3092                                          SMB2_MAX_BUFFER_SIZE));
3093         /* always an FSCTL (for now) */
3094         req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
3095
3096         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3097         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3098                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
3099
3100         return 0;
3101 }
3102
3103 void
3104 SMB2_ioctl_free(struct smb_rqst *rqst)
3105 {
3106         int i;
3107         if (rqst && rqst->rq_iov) {
3108                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3109                 for (i = 1; i < rqst->rq_nvec; i++)
3110                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3111                                 kfree(rqst->rq_iov[i].iov_base);
3112         }
3113 }
3114
3115
3116 /*
3117  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
3118  */
3119 int
3120 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3121            u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen,
3122            u32 max_out_data_len, char **out_data,
3123            u32 *plen /* returned data len */)
3124 {
3125         struct smb_rqst rqst;
3126         struct smb2_ioctl_rsp *rsp = NULL;
3127         struct cifs_ses *ses;
3128         struct TCP_Server_Info *server;
3129         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3130         struct kvec rsp_iov = {NULL, 0};
3131         int resp_buftype = CIFS_NO_BUFFER;
3132         int rc = 0;
3133         int flags = 0;
3134
3135         cifs_dbg(FYI, "SMB2 IOCTL\n");
3136
3137         if (out_data != NULL)
3138                 *out_data = NULL;
3139
3140         /* zero out returned data len, in case of error */
3141         if (plen)
3142                 *plen = 0;
3143
3144         if (!tcon)
3145                 return -EIO;
3146
3147         ses = tcon->ses;
3148         if (!ses)
3149                 return -EIO;
3150
3151         server = cifs_pick_channel(ses);
3152         if (!server)
3153                 return -EIO;
3154
3155         if (smb3_encryption_required(tcon))
3156                 flags |= CIFS_TRANSFORM_REQ;
3157
3158         memset(&rqst, 0, sizeof(struct smb_rqst));
3159         memset(&iov, 0, sizeof(iov));
3160         rqst.rq_iov = iov;
3161         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3162
3163         rc = SMB2_ioctl_init(tcon, server,
3164                              &rqst, persistent_fid, volatile_fid, opcode,
3165                              in_data, indatalen, max_out_data_len);
3166         if (rc)
3167                 goto ioctl_exit;
3168
3169         rc = cifs_send_recv(xid, ses, server,
3170                             &rqst, &resp_buftype, flags,
3171                             &rsp_iov);
3172         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3173
3174         if (rc != 0)
3175                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3176                                 ses->Suid, 0, opcode, rc);
3177
3178         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3179                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3180                 goto ioctl_exit;
3181         } else if (rc == -EINVAL) {
3182                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3183                     (opcode != FSCTL_SRV_COPYCHUNK)) {
3184                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3185                         goto ioctl_exit;
3186                 }
3187         } else if (rc == -E2BIG) {
3188                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3189                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3190                         goto ioctl_exit;
3191                 }
3192         }
3193
3194         /* check if caller wants to look at return data or just return rc */
3195         if ((plen == NULL) || (out_data == NULL))
3196                 goto ioctl_exit;
3197
3198         /*
3199          * Although unlikely to be possible for rsp to be null and rc not set,
3200          * adding check below is slightly safer long term (and quiets Coverity
3201          * warning)
3202          */
3203         if (rsp == NULL) {
3204                 rc = -EIO;
3205                 goto ioctl_exit;
3206         }
3207
3208         *plen = le32_to_cpu(rsp->OutputCount);
3209
3210         /* We check for obvious errors in the output buffer length and offset */
3211         if (*plen == 0)
3212                 goto ioctl_exit; /* server returned no data */
3213         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3214                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3215                 *plen = 0;
3216                 rc = -EIO;
3217                 goto ioctl_exit;
3218         }
3219
3220         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3221                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3222                         le32_to_cpu(rsp->OutputOffset));
3223                 *plen = 0;
3224                 rc = -EIO;
3225                 goto ioctl_exit;
3226         }
3227
3228         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3229                             *plen, GFP_KERNEL);
3230         if (*out_data == NULL) {
3231                 rc = -ENOMEM;
3232                 goto ioctl_exit;
3233         }
3234
3235 ioctl_exit:
3236         SMB2_ioctl_free(&rqst);
3237         free_rsp_buf(resp_buftype, rsp);
3238         return rc;
3239 }
3240
3241 /*
3242  *   Individual callers to ioctl worker function follow
3243  */
3244
3245 int
3246 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3247                      u64 persistent_fid, u64 volatile_fid)
3248 {
3249         int rc;
3250         struct  compress_ioctl fsctl_input;
3251         char *ret_data = NULL;
3252
3253         fsctl_input.CompressionState =
3254                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3255
3256         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3257                         FSCTL_SET_COMPRESSION,
3258                         (char *)&fsctl_input /* data input */,
3259                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3260                         &ret_data /* out data */, NULL);
3261
3262         cifs_dbg(FYI, "set compression rc %d\n", rc);
3263
3264         return rc;
3265 }
3266
3267 int
3268 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3269                 struct smb_rqst *rqst,
3270                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3271 {
3272         struct smb2_close_req *req;
3273         struct kvec *iov = rqst->rq_iov;
3274         unsigned int total_len;
3275         int rc;
3276
3277         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3278                                  (void **) &req, &total_len);
3279         if (rc)
3280                 return rc;
3281
3282         req->PersistentFileId = persistent_fid;
3283         req->VolatileFileId = volatile_fid;
3284         if (query_attrs)
3285                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3286         else
3287                 req->Flags = 0;
3288         iov[0].iov_base = (char *)req;
3289         iov[0].iov_len = total_len;
3290
3291         return 0;
3292 }
3293
3294 void
3295 SMB2_close_free(struct smb_rqst *rqst)
3296 {
3297         if (rqst && rqst->rq_iov)
3298                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3299 }
3300
3301 int
3302 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3303              u64 persistent_fid, u64 volatile_fid,
3304              struct smb2_file_network_open_info *pbuf)
3305 {
3306         struct smb_rqst rqst;
3307         struct smb2_close_rsp *rsp = NULL;
3308         struct cifs_ses *ses = tcon->ses;
3309         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3310         struct kvec iov[1];
3311         struct kvec rsp_iov;
3312         int resp_buftype = CIFS_NO_BUFFER;
3313         int rc = 0;
3314         int flags = 0;
3315         bool query_attrs = false;
3316
3317         cifs_dbg(FYI, "Close\n");
3318
3319         if (!ses || !server)
3320                 return -EIO;
3321
3322         if (smb3_encryption_required(tcon))
3323                 flags |= CIFS_TRANSFORM_REQ;
3324
3325         memset(&rqst, 0, sizeof(struct smb_rqst));
3326         memset(&iov, 0, sizeof(iov));
3327         rqst.rq_iov = iov;
3328         rqst.rq_nvec = 1;
3329
3330         /* check if need to ask server to return timestamps in close response */
3331         if (pbuf)
3332                 query_attrs = true;
3333
3334         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3335         rc = SMB2_close_init(tcon, server,
3336                              &rqst, persistent_fid, volatile_fid,
3337                              query_attrs);
3338         if (rc)
3339                 goto close_exit;
3340
3341         rc = cifs_send_recv(xid, ses, server,
3342                             &rqst, &resp_buftype, flags, &rsp_iov);
3343         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3344
3345         if (rc != 0) {
3346                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3347                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3348                                      rc);
3349                 goto close_exit;
3350         } else {
3351                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3352                                       ses->Suid);
3353                 /*
3354                  * Note that have to subtract 4 since struct network_open_info
3355                  * has a final 4 byte pad that close response does not have
3356                  */
3357                 if (pbuf)
3358                         memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3359         }
3360
3361         atomic_dec(&tcon->num_remote_opens);
3362 close_exit:
3363         SMB2_close_free(&rqst);
3364         free_rsp_buf(resp_buftype, rsp);
3365
3366         /* retry close in a worker thread if this one is interrupted */
3367         if (is_interrupt_error(rc)) {
3368                 int tmp_rc;
3369
3370                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3371                                                      volatile_fid);
3372                 if (tmp_rc)
3373                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3374                                  persistent_fid, tmp_rc);
3375         }
3376         return rc;
3377 }
3378
3379 int
3380 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3381                 u64 persistent_fid, u64 volatile_fid)
3382 {
3383         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3384 }
3385
3386 int
3387 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3388                   struct kvec *iov, unsigned int min_buf_size)
3389 {
3390         unsigned int smb_len = iov->iov_len;
3391         char *end_of_smb = smb_len + (char *)iov->iov_base;
3392         char *begin_of_buf = offset + (char *)iov->iov_base;
3393         char *end_of_buf = begin_of_buf + buffer_length;
3394
3395
3396         if (buffer_length < min_buf_size) {
3397                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3398                          buffer_length, min_buf_size);
3399                 return -EINVAL;
3400         }
3401
3402         /* check if beyond RFC1001 maximum length */
3403         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3404                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3405                          buffer_length, smb_len);
3406                 return -EINVAL;
3407         }
3408
3409         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3410                 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3411                 return -EINVAL;
3412         }
3413
3414         return 0;
3415 }
3416
3417 /*
3418  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3419  * Caller must free buffer.
3420  */
3421 int
3422 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3423                            struct kvec *iov, unsigned int minbufsize,
3424                            char *data)
3425 {
3426         char *begin_of_buf = offset + (char *)iov->iov_base;
3427         int rc;
3428
3429         if (!data)
3430                 return -EINVAL;
3431
3432         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3433         if (rc)
3434                 return rc;
3435
3436         memcpy(data, begin_of_buf, minbufsize);
3437
3438         return 0;
3439 }
3440
3441 int
3442 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3443                      struct smb_rqst *rqst,
3444                      u64 persistent_fid, u64 volatile_fid,
3445                      u8 info_class, u8 info_type, u32 additional_info,
3446                      size_t output_len, size_t input_len, void *input)
3447 {
3448         struct smb2_query_info_req *req;
3449         struct kvec *iov = rqst->rq_iov;
3450         unsigned int total_len;
3451         int rc;
3452
3453         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3454                                  (void **) &req, &total_len);
3455         if (rc)
3456                 return rc;
3457
3458         req->InfoType = info_type;
3459         req->FileInfoClass = info_class;
3460         req->PersistentFileId = persistent_fid;
3461         req->VolatileFileId = volatile_fid;
3462         req->AdditionalInformation = cpu_to_le32(additional_info);
3463
3464         req->OutputBufferLength = cpu_to_le32(output_len);
3465         if (input_len) {
3466                 req->InputBufferLength = cpu_to_le32(input_len);
3467                 /* total_len for smb query request never close to le16 max */
3468                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3469                 memcpy(req->Buffer, input, input_len);
3470         }
3471
3472         iov[0].iov_base = (char *)req;
3473         /* 1 for Buffer */
3474         iov[0].iov_len = total_len - 1 + input_len;
3475         return 0;
3476 }
3477
3478 void
3479 SMB2_query_info_free(struct smb_rqst *rqst)
3480 {
3481         if (rqst && rqst->rq_iov)
3482                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3483 }
3484
3485 static int
3486 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3487            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3488            u32 additional_info, size_t output_len, size_t min_len, void **data,
3489                 u32 *dlen)
3490 {
3491         struct smb_rqst rqst;
3492         struct smb2_query_info_rsp *rsp = NULL;
3493         struct kvec iov[1];
3494         struct kvec rsp_iov;
3495         int rc = 0;
3496         int resp_buftype = CIFS_NO_BUFFER;
3497         struct cifs_ses *ses = tcon->ses;
3498         struct TCP_Server_Info *server;
3499         int flags = 0;
3500         bool allocated = false;
3501
3502         cifs_dbg(FYI, "Query Info\n");
3503
3504         if (!ses)
3505                 return -EIO;
3506         server = cifs_pick_channel(ses);
3507         if (!server)
3508                 return -EIO;
3509
3510         if (smb3_encryption_required(tcon))
3511                 flags |= CIFS_TRANSFORM_REQ;
3512
3513         memset(&rqst, 0, sizeof(struct smb_rqst));
3514         memset(&iov, 0, sizeof(iov));
3515         rqst.rq_iov = iov;
3516         rqst.rq_nvec = 1;
3517
3518         rc = SMB2_query_info_init(tcon, server,
3519                                   &rqst, persistent_fid, volatile_fid,
3520                                   info_class, info_type, additional_info,
3521                                   output_len, 0, NULL);
3522         if (rc)
3523                 goto qinf_exit;
3524
3525         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3526                                     ses->Suid, info_class, (__u32)info_type);
3527
3528         rc = cifs_send_recv(xid, ses, server,
3529                             &rqst, &resp_buftype, flags, &rsp_iov);
3530         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3531
3532         if (rc) {
3533                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3534                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3535                                 ses->Suid, info_class, (__u32)info_type, rc);
3536                 goto qinf_exit;
3537         }
3538
3539         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3540                                 ses->Suid, info_class, (__u32)info_type);
3541
3542         if (dlen) {
3543                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3544                 if (!*data) {
3545                         *data = kmalloc(*dlen, GFP_KERNEL);
3546                         if (!*data) {
3547                                 cifs_tcon_dbg(VFS,
3548                                         "Error %d allocating memory for acl\n",
3549                                         rc);
3550                                 *dlen = 0;
3551                                 rc = -ENOMEM;
3552                                 goto qinf_exit;
3553                         }
3554                         allocated = true;
3555                 }
3556         }
3557
3558         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3559                                         le32_to_cpu(rsp->OutputBufferLength),
3560                                         &rsp_iov, dlen ? *dlen : min_len, *data);
3561         if (rc && allocated) {
3562                 kfree(*data);
3563                 *data = NULL;
3564                 *dlen = 0;
3565         }
3566
3567 qinf_exit:
3568         SMB2_query_info_free(&rqst);
3569         free_rsp_buf(resp_buftype, rsp);
3570         return rc;
3571 }
3572
3573 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3574         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3575 {
3576         return query_info(xid, tcon, persistent_fid, volatile_fid,
3577                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3578                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3579                           sizeof(struct smb2_file_all_info), (void **)&data,
3580                           NULL);
3581 }
3582
3583 #if 0
3584 /* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */
3585 int
3586 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3587                 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3588 {
3589         size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3590                         (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3591         *plen = 0;
3592
3593         return query_info(xid, tcon, persistent_fid, volatile_fid,
3594                           SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3595                           output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3596         /* Note caller must free "data" (passed in above). It may be allocated in query_info call */
3597 }
3598 #endif
3599
3600 int
3601 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3602                u64 persistent_fid, u64 volatile_fid,
3603                void **data, u32 *plen, u32 extra_info)
3604 {
3605         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO |
3606                                 extra_info;
3607         *plen = 0;
3608
3609         return query_info(xid, tcon, persistent_fid, volatile_fid,
3610                           0, SMB2_O_INFO_SECURITY, additional_info,
3611                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3612 }
3613
3614 int
3615 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3616                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3617 {
3618         return query_info(xid, tcon, persistent_fid, volatile_fid,
3619                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3620                           sizeof(struct smb2_file_internal_info),
3621                           sizeof(struct smb2_file_internal_info),
3622                           (void **)&uniqueid, NULL);
3623 }
3624
3625 /*
3626  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3627  * See MS-SMB2 2.2.35 and 2.2.36
3628  */
3629
3630 static int
3631 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3632                  struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3633                  u64 persistent_fid, u64 volatile_fid,
3634                  u32 completion_filter, bool watch_tree)
3635 {
3636         struct smb2_change_notify_req *req;
3637         struct kvec *iov = rqst->rq_iov;
3638         unsigned int total_len;
3639         int rc;
3640
3641         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3642                                  (void **) &req, &total_len);
3643         if (rc)
3644                 return rc;
3645
3646         req->PersistentFileId = persistent_fid;
3647         req->VolatileFileId = volatile_fid;
3648         /* See note 354 of MS-SMB2, 64K max */
3649         req->OutputBufferLength =
3650                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3651         req->CompletionFilter = cpu_to_le32(completion_filter);
3652         if (watch_tree)
3653                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3654         else
3655                 req->Flags = 0;
3656
3657         iov[0].iov_base = (char *)req;
3658         iov[0].iov_len = total_len;
3659
3660         return 0;
3661 }
3662
3663 int
3664 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3665                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3666                 u32 completion_filter, u32 max_out_data_len, char **out_data,
3667                 u32 *plen /* returned data len */)
3668 {
3669         struct cifs_ses *ses = tcon->ses;
3670         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3671         struct smb_rqst rqst;
3672         struct smb2_change_notify_rsp *smb_rsp;
3673         struct kvec iov[1];
3674         struct kvec rsp_iov = {NULL, 0};
3675         int resp_buftype = CIFS_NO_BUFFER;
3676         int flags = 0;
3677         int rc = 0;
3678
3679         cifs_dbg(FYI, "change notify\n");
3680         if (!ses || !server)
3681                 return -EIO;
3682
3683         if (smb3_encryption_required(tcon))
3684                 flags |= CIFS_TRANSFORM_REQ;
3685
3686         memset(&rqst, 0, sizeof(struct smb_rqst));
3687         memset(&iov, 0, sizeof(iov));
3688         if (plen)
3689                 *plen = 0;
3690
3691         rqst.rq_iov = iov;
3692         rqst.rq_nvec = 1;
3693
3694         rc = SMB2_notify_init(xid, &rqst, tcon, server,
3695                               persistent_fid, volatile_fid,
3696                               completion_filter, watch_tree);
3697         if (rc)
3698                 goto cnotify_exit;
3699
3700         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3701                                 (u8)watch_tree, completion_filter);
3702         rc = cifs_send_recv(xid, ses, server,
3703                             &rqst, &resp_buftype, flags, &rsp_iov);
3704
3705         if (rc != 0) {
3706                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3707                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3708                                 (u8)watch_tree, completion_filter, rc);
3709         } else {
3710                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3711                         ses->Suid, (u8)watch_tree, completion_filter);
3712                 /* validate that notify information is plausible */
3713                 if ((rsp_iov.iov_base == NULL) ||
3714                     (rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp) + 1))
3715                         goto cnotify_exit;
3716
3717                 smb_rsp = (struct smb2_change_notify_rsp *)rsp_iov.iov_base;
3718
3719                 smb2_validate_iov(le16_to_cpu(smb_rsp->OutputBufferOffset),
3720                                 le32_to_cpu(smb_rsp->OutputBufferLength), &rsp_iov,
3721                                 sizeof(struct file_notify_information));
3722
3723                 *out_data = kmemdup((char *)smb_rsp + le16_to_cpu(smb_rsp->OutputBufferOffset),
3724                                 le32_to_cpu(smb_rsp->OutputBufferLength), GFP_KERNEL);
3725                 if (*out_data == NULL) {
3726                         rc = -ENOMEM;
3727                         goto cnotify_exit;
3728                 } else
3729                         *plen = le32_to_cpu(smb_rsp->OutputBufferLength);
3730         }
3731
3732  cnotify_exit:
3733         if (rqst.rq_iov)
3734                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3735         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3736         return rc;
3737 }
3738
3739
3740
3741 /*
3742  * This is a no-op for now. We're not really interested in the reply, but
3743  * rather in the fact that the server sent one and that server->lstrp
3744  * gets updated.
3745  *
3746  * FIXME: maybe we should consider checking that the reply matches request?
3747  */
3748 static void
3749 smb2_echo_callback(struct mid_q_entry *mid)
3750 {
3751         struct TCP_Server_Info *server = mid->callback_data;
3752         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3753         struct cifs_credits credits = { .value = 0, .instance = 0 };
3754
3755         if (mid->mid_state == MID_RESPONSE_RECEIVED
3756             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3757                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
3758                 credits.instance = server->reconnect_instance;
3759         }
3760
3761         release_mid(mid);
3762         add_credits(server, &credits, CIFS_ECHO_OP);
3763 }
3764
3765 void smb2_reconnect_server(struct work_struct *work)
3766 {
3767         struct TCP_Server_Info *server = container_of(work,
3768                                         struct TCP_Server_Info, reconnect.work);
3769         struct TCP_Server_Info *pserver;
3770         struct cifs_ses *ses, *ses2;
3771         struct cifs_tcon *tcon, *tcon2;
3772         struct list_head tmp_list, tmp_ses_list;
3773         bool tcon_exist = false, ses_exist = false;
3774         bool tcon_selected = false;
3775         int rc;
3776         bool resched = false;
3777
3778         /* If server is a channel, select the primary channel */
3779         pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
3780
3781         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3782         mutex_lock(&pserver->reconnect_mutex);
3783
3784         INIT_LIST_HEAD(&tmp_list);
3785         INIT_LIST_HEAD(&tmp_ses_list);
3786         cifs_dbg(FYI, "Reconnecting tcons and channels\n");
3787
3788         spin_lock(&cifs_tcp_ses_lock);
3789         list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
3790
3791                 tcon_selected = false;
3792
3793                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3794                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3795                                 tcon->tc_count++;
3796                                 list_add_tail(&tcon->rlist, &tmp_list);
3797                                 tcon_selected = tcon_exist = true;
3798                         }
3799                 }
3800                 /*
3801                  * IPC has the same lifetime as its session and uses its
3802                  * refcount.
3803                  */
3804                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3805                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3806                         tcon_selected = tcon_exist = true;
3807                         cifs_smb_ses_inc_refcount(ses);
3808                 }
3809                 /*
3810                  * handle the case where channel needs to reconnect
3811                  * binding session, but tcon is healthy (some other channel
3812                  * is active)
3813                  */
3814                 spin_lock(&ses->chan_lock);
3815                 if (!tcon_selected && cifs_chan_needs_reconnect(ses, server)) {
3816                         list_add_tail(&ses->rlist, &tmp_ses_list);
3817                         ses_exist = true;
3818                         cifs_smb_ses_inc_refcount(ses);
3819                 }
3820                 spin_unlock(&ses->chan_lock);
3821         }
3822         /*
3823          * Get the reference to server struct to be sure that the last call of
3824          * cifs_put_tcon() in the loop below won't release the server pointer.
3825          */
3826         if (tcon_exist || ses_exist)
3827                 server->srv_count++;
3828
3829         spin_unlock(&cifs_tcp_ses_lock);
3830
3831         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3832                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3833                 if (!rc)
3834                         cifs_reopen_persistent_handles(tcon);
3835                 else
3836                         resched = true;
3837                 list_del_init(&tcon->rlist);
3838                 if (tcon->ipc)
3839                         cifs_put_smb_ses(tcon->ses);
3840                 else
3841                         cifs_put_tcon(tcon);
3842         }
3843
3844         if (!ses_exist)
3845                 goto done;
3846
3847         /* allocate a dummy tcon struct used for reconnect */
3848         tcon = tconInfoAlloc();
3849         if (!tcon) {
3850                 resched = true;
3851                 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
3852                         list_del_init(&ses->rlist);
3853                         cifs_put_smb_ses(ses);
3854                 }
3855                 goto done;
3856         }
3857
3858         tcon->status = TID_GOOD;
3859         tcon->retry = false;
3860         tcon->need_reconnect = false;
3861
3862         /* now reconnect sessions for necessary channels */
3863         list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
3864                 tcon->ses = ses;
3865                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3866                 if (rc)
3867                         resched = true;
3868                 list_del_init(&ses->rlist);
3869                 cifs_put_smb_ses(ses);
3870         }
3871         tconInfoFree(tcon);
3872
3873 done:
3874         cifs_dbg(FYI, "Reconnecting tcons and channels finished\n");
3875         if (resched)
3876                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3877         mutex_unlock(&pserver->reconnect_mutex);
3878
3879         /* now we can safely release srv struct */
3880         if (tcon_exist || ses_exist)
3881                 cifs_put_tcp_session(server, 1);
3882 }
3883
3884 int
3885 SMB2_echo(struct TCP_Server_Info *server)
3886 {
3887         struct smb2_echo_req *req;
3888         int rc = 0;
3889         struct kvec iov[1];
3890         struct smb_rqst rqst = { .rq_iov = iov,
3891                                  .rq_nvec = 1 };
3892         unsigned int total_len;
3893
3894         cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id);
3895
3896         spin_lock(&server->srv_lock);
3897         if (server->ops->need_neg &&
3898             server->ops->need_neg(server)) {
3899                 spin_unlock(&server->srv_lock);
3900                 /* No need to send echo on newly established connections */
3901                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
3902                 return rc;
3903         }
3904         spin_unlock(&server->srv_lock);
3905
3906         rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
3907                                  (void **)&req, &total_len);
3908         if (rc)
3909                 return rc;
3910
3911         req->hdr.CreditRequest = cpu_to_le16(1);
3912
3913         iov[0].iov_len = total_len;
3914         iov[0].iov_base = (char *)req;
3915
3916         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3917                              server, CIFS_ECHO_OP, NULL);
3918         if (rc)
3919                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3920
3921         cifs_small_buf_release(req);
3922         return rc;
3923 }
3924
3925 void
3926 SMB2_flush_free(struct smb_rqst *rqst)
3927 {
3928         if (rqst && rqst->rq_iov)
3929                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3930 }
3931
3932 int
3933 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3934                 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3935                 u64 persistent_fid, u64 volatile_fid)
3936 {
3937         struct smb2_flush_req *req;
3938         struct kvec *iov = rqst->rq_iov;
3939         unsigned int total_len;
3940         int rc;
3941
3942         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
3943                                  (void **) &req, &total_len);
3944         if (rc)
3945                 return rc;
3946
3947         req->PersistentFileId = persistent_fid;
3948         req->VolatileFileId = volatile_fid;
3949
3950         iov[0].iov_base = (char *)req;
3951         iov[0].iov_len = total_len;
3952
3953         return 0;
3954 }
3955
3956 int
3957 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3958            u64 volatile_fid)
3959 {
3960         struct cifs_ses *ses = tcon->ses;
3961         struct smb_rqst rqst;
3962         struct kvec iov[1];
3963         struct kvec rsp_iov = {NULL, 0};
3964         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3965         int resp_buftype = CIFS_NO_BUFFER;
3966         int flags = 0;
3967         int rc = 0;
3968
3969         cifs_dbg(FYI, "flush\n");
3970         if (!ses || !(ses->server))
3971                 return -EIO;
3972
3973         if (smb3_encryption_required(tcon))
3974                 flags |= CIFS_TRANSFORM_REQ;
3975
3976         memset(&rqst, 0, sizeof(struct smb_rqst));
3977         memset(&iov, 0, sizeof(iov));
3978         rqst.rq_iov = iov;
3979         rqst.rq_nvec = 1;
3980
3981         rc = SMB2_flush_init(xid, &rqst, tcon, server,
3982                              persistent_fid, volatile_fid);
3983         if (rc)
3984                 goto flush_exit;
3985
3986         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3987         rc = cifs_send_recv(xid, ses, server,
3988                             &rqst, &resp_buftype, flags, &rsp_iov);
3989
3990         if (rc != 0) {
3991                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3992                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3993                                      rc);
3994         } else
3995                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
3996                                       ses->Suid);
3997
3998  flush_exit:
3999         SMB2_flush_free(&rqst);
4000         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4001         return rc;
4002 }
4003
4004 #ifdef CONFIG_CIFS_SMB_DIRECT
4005 static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms)
4006 {
4007         struct TCP_Server_Info *server = io_parms->server;
4008         struct cifs_tcon *tcon = io_parms->tcon;
4009
4010         /* we can only offload if we're connected */
4011         if (!server || !tcon)
4012                 return false;
4013
4014         /* we can only offload on an rdma connection */
4015         if (!server->rdma || !server->smbd_conn)
4016                 return false;
4017
4018         /* we don't support signed offload yet */
4019         if (server->sign)
4020                 return false;
4021
4022         /* we don't support encrypted offload yet */
4023         if (smb3_encryption_required(tcon))
4024                 return false;
4025
4026         /* offload also has its overhead, so only do it if desired */
4027         if (io_parms->length < server->smbd_conn->rdma_readwrite_threshold)
4028                 return false;
4029
4030         return true;
4031 }
4032 #endif /* CONFIG_CIFS_SMB_DIRECT */
4033
4034 /*
4035  * To form a chain of read requests, any read requests after the first should
4036  * have the end_of_chain boolean set to true.
4037  */
4038 static int
4039 smb2_new_read_req(void **buf, unsigned int *total_len,
4040         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
4041         unsigned int remaining_bytes, int request_type)
4042 {
4043         int rc = -EACCES;
4044         struct smb2_read_req *req = NULL;
4045         struct smb2_hdr *shdr;
4046         struct TCP_Server_Info *server = io_parms->server;
4047
4048         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
4049                                  (void **) &req, total_len);
4050         if (rc)
4051                 return rc;
4052
4053         if (server == NULL)
4054                 return -ECONNABORTED;
4055
4056         shdr = &req->hdr;
4057         shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4058
4059         req->PersistentFileId = io_parms->persistent_fid;
4060         req->VolatileFileId = io_parms->volatile_fid;
4061         req->ReadChannelInfoOffset = 0; /* reserved */
4062         req->ReadChannelInfoLength = 0; /* reserved */
4063         req->Channel = 0; /* reserved */
4064         req->MinimumCount = 0;
4065         req->Length = cpu_to_le32(io_parms->length);
4066         req->Offset = cpu_to_le64(io_parms->offset);
4067
4068         trace_smb3_read_enter(0 /* xid */,
4069                         io_parms->persistent_fid,
4070                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4071                         io_parms->offset, io_parms->length);
4072 #ifdef CONFIG_CIFS_SMB_DIRECT
4073         /*
4074          * If we want to do a RDMA write, fill in and append
4075          * smbd_buffer_descriptor_v1 to the end of read request
4076          */
4077         if (smb3_use_rdma_offload(io_parms)) {
4078                 struct smbd_buffer_descriptor_v1 *v1;
4079                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4080
4081                 rdata->mr = smbd_register_mr(server->smbd_conn, &rdata->iter,
4082                                              true, need_invalidate);
4083                 if (!rdata->mr)
4084                         return -EAGAIN;
4085
4086                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4087                 if (need_invalidate)
4088                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4089                 req->ReadChannelInfoOffset =
4090                         cpu_to_le16(offsetof(struct smb2_read_req, Buffer));
4091                 req->ReadChannelInfoLength =
4092                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4093                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4094                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
4095                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
4096                 v1->length = cpu_to_le32(rdata->mr->mr->length);
4097
4098                 *total_len += sizeof(*v1) - 1;
4099         }
4100 #endif
4101         if (request_type & CHAINED_REQUEST) {
4102                 if (!(request_type & END_OF_CHAIN)) {
4103                         /* next 8-byte aligned request */
4104                         *total_len = ALIGN(*total_len, 8);
4105                         shdr->NextCommand = cpu_to_le32(*total_len);
4106                 } else /* END_OF_CHAIN */
4107                         shdr->NextCommand = 0;
4108                 if (request_type & RELATED_REQUEST) {
4109                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
4110                         /*
4111                          * Related requests use info from previous read request
4112                          * in chain.
4113                          */
4114                         shdr->SessionId = cpu_to_le64(0xFFFFFFFFFFFFFFFF);
4115                         shdr->Id.SyncId.TreeId = cpu_to_le32(0xFFFFFFFF);
4116                         req->PersistentFileId = (u64)-1;
4117                         req->VolatileFileId = (u64)-1;
4118                 }
4119         }
4120         if (remaining_bytes > io_parms->length)
4121                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
4122         else
4123                 req->RemainingBytes = 0;
4124
4125         *buf = req;
4126         return rc;
4127 }
4128
4129 static void
4130 smb2_readv_callback(struct mid_q_entry *mid)
4131 {
4132         struct cifs_readdata *rdata = mid->callback_data;
4133         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4134         struct TCP_Server_Info *server = rdata->server;
4135         struct smb2_hdr *shdr =
4136                                 (struct smb2_hdr *)rdata->iov[0].iov_base;
4137         struct cifs_credits credits = { .value = 0, .instance = 0 };
4138         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1], .rq_nvec = 1 };
4139
4140         if (rdata->got_bytes) {
4141                 rqst.rq_iter      = rdata->iter;
4142                 rqst.rq_iter_size = iov_iter_count(&rdata->iter);
4143         }
4144
4145         WARN_ONCE(rdata->server != mid->server,
4146                   "rdata server %p != mid server %p",
4147                   rdata->server, mid->server);
4148
4149         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
4150                  __func__, mid->mid, mid->mid_state, rdata->result,
4151                  rdata->bytes);
4152
4153         switch (mid->mid_state) {
4154         case MID_RESPONSE_RECEIVED:
4155                 credits.value = le16_to_cpu(shdr->CreditRequest);
4156                 credits.instance = server->reconnect_instance;
4157                 /* result already set, check signature */
4158                 if (server->sign && !mid->decrypted) {
4159                         int rc;
4160
4161                         iov_iter_revert(&rqst.rq_iter, rdata->got_bytes);
4162                         iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes);
4163                         rc = smb2_verify_signature(&rqst, server);
4164                         if (rc)
4165                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
4166                                          rc);
4167                 }
4168                 /* FIXME: should this be counted toward the initiating task? */
4169                 task_io_account_read(rdata->got_bytes);
4170                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4171                 break;
4172         case MID_REQUEST_SUBMITTED:
4173         case MID_RETRY_NEEDED:
4174                 rdata->result = -EAGAIN;
4175                 if (server->sign && rdata->got_bytes)
4176                         /* reset bytes number since we can not check a sign */
4177                         rdata->got_bytes = 0;
4178                 /* FIXME: should this be counted toward the initiating task? */
4179                 task_io_account_read(rdata->got_bytes);
4180                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4181                 break;
4182         case MID_RESPONSE_MALFORMED:
4183                 credits.value = le16_to_cpu(shdr->CreditRequest);
4184                 credits.instance = server->reconnect_instance;
4185                 fallthrough;
4186         default:
4187                 rdata->result = -EIO;
4188         }
4189 #ifdef CONFIG_CIFS_SMB_DIRECT
4190         /*
4191          * If this rdata has a memmory registered, the MR can be freed
4192          * MR needs to be freed as soon as I/O finishes to prevent deadlock
4193          * because they have limited number and are used for future I/Os
4194          */
4195         if (rdata->mr) {
4196                 smbd_deregister_mr(rdata->mr);
4197                 rdata->mr = NULL;
4198         }
4199 #endif
4200         if (rdata->result && rdata->result != -ENODATA) {
4201                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
4202                 trace_smb3_read_err(0 /* xid */,
4203                                     rdata->cfile->fid.persistent_fid,
4204                                     tcon->tid, tcon->ses->Suid, rdata->offset,
4205                                     rdata->bytes, rdata->result);
4206         } else
4207                 trace_smb3_read_done(0 /* xid */,
4208                                      rdata->cfile->fid.persistent_fid,
4209                                      tcon->tid, tcon->ses->Suid,
4210                                      rdata->offset, rdata->got_bytes);
4211
4212         queue_work(cifsiod_wq, &rdata->work);
4213         release_mid(mid);
4214         add_credits(server, &credits, 0);
4215 }
4216
4217 /* smb2_async_readv - send an async read, and set up mid to handle result */
4218 int
4219 smb2_async_readv(struct cifs_readdata *rdata)
4220 {
4221         int rc, flags = 0;
4222         char *buf;
4223         struct smb2_hdr *shdr;
4224         struct cifs_io_parms io_parms;
4225         struct smb_rqst rqst = { .rq_iov = rdata->iov,
4226                                  .rq_nvec = 1 };
4227         struct TCP_Server_Info *server;
4228         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4229         unsigned int total_len;
4230
4231         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
4232                  __func__, rdata->offset, rdata->bytes);
4233
4234         if (!rdata->server)
4235                 rdata->server = cifs_pick_channel(tcon->ses);
4236
4237         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
4238         io_parms.server = server = rdata->server;
4239         io_parms.offset = rdata->offset;
4240         io_parms.length = rdata->bytes;
4241         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
4242         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
4243         io_parms.pid = rdata->pid;
4244
4245         rc = smb2_new_read_req(
4246                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4247         if (rc)
4248                 return rc;
4249
4250         if (smb3_encryption_required(io_parms.tcon))
4251                 flags |= CIFS_TRANSFORM_REQ;
4252
4253         rdata->iov[0].iov_base = buf;
4254         rdata->iov[0].iov_len = total_len;
4255
4256         shdr = (struct smb2_hdr *)buf;
4257
4258         if (rdata->credits.value > 0) {
4259                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
4260                                                 SMB2_MAX_BUFFER_SIZE));
4261                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4262
4263                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
4264                 if (rc)
4265                         goto async_readv_out;
4266
4267                 flags |= CIFS_HAS_CREDITS;
4268         }
4269
4270         kref_get(&rdata->refcount);
4271         rc = cifs_call_async(server, &rqst,
4272                              cifs_readv_receive, smb2_readv_callback,
4273                              smb3_handle_read_data, rdata, flags,
4274                              &rdata->credits);
4275         if (rc) {
4276                 kref_put(&rdata->refcount, cifs_readdata_release);
4277                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4278                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4279                                     io_parms.tcon->tid,
4280                                     io_parms.tcon->ses->Suid,
4281                                     io_parms.offset, io_parms.length, rc);
4282         }
4283
4284 async_readv_out:
4285         cifs_small_buf_release(buf);
4286         return rc;
4287 }
4288
4289 int
4290 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4291           unsigned int *nbytes, char **buf, int *buf_type)
4292 {
4293         struct smb_rqst rqst;
4294         int resp_buftype, rc;
4295         struct smb2_read_req *req = NULL;
4296         struct smb2_read_rsp *rsp = NULL;
4297         struct kvec iov[1];
4298         struct kvec rsp_iov;
4299         unsigned int total_len;
4300         int flags = CIFS_LOG_ERROR;
4301         struct cifs_ses *ses = io_parms->tcon->ses;
4302
4303         if (!io_parms->server)
4304                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4305
4306         *nbytes = 0;
4307         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4308         if (rc)
4309                 return rc;
4310
4311         if (smb3_encryption_required(io_parms->tcon))
4312                 flags |= CIFS_TRANSFORM_REQ;
4313
4314         iov[0].iov_base = (char *)req;
4315         iov[0].iov_len = total_len;
4316
4317         memset(&rqst, 0, sizeof(struct smb_rqst));
4318         rqst.rq_iov = iov;
4319         rqst.rq_nvec = 1;
4320
4321         rc = cifs_send_recv(xid, ses, io_parms->server,
4322                             &rqst, &resp_buftype, flags, &rsp_iov);
4323         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4324
4325         if (rc) {
4326                 if (rc != -ENODATA) {
4327                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4328                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
4329                         trace_smb3_read_err(xid,
4330                                             req->PersistentFileId,
4331                                             io_parms->tcon->tid, ses->Suid,
4332                                             io_parms->offset, io_parms->length,
4333                                             rc);
4334                 } else
4335                         trace_smb3_read_done(xid, req->PersistentFileId, io_parms->tcon->tid,
4336                                              ses->Suid, io_parms->offset, 0);
4337                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4338                 cifs_small_buf_release(req);
4339                 return rc == -ENODATA ? 0 : rc;
4340         } else
4341                 trace_smb3_read_done(xid,
4342                                     req->PersistentFileId,
4343                                     io_parms->tcon->tid, ses->Suid,
4344                                     io_parms->offset, io_parms->length);
4345
4346         cifs_small_buf_release(req);
4347
4348         *nbytes = le32_to_cpu(rsp->DataLength);
4349         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4350             (*nbytes > io_parms->length)) {
4351                 cifs_dbg(FYI, "bad length %d for count %d\n",
4352                          *nbytes, io_parms->length);
4353                 rc = -EIO;
4354                 *nbytes = 0;
4355         }
4356
4357         if (*buf) {
4358                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4359                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4360         } else if (resp_buftype != CIFS_NO_BUFFER) {
4361                 *buf = rsp_iov.iov_base;
4362                 if (resp_buftype == CIFS_SMALL_BUFFER)
4363                         *buf_type = CIFS_SMALL_BUFFER;
4364                 else if (resp_buftype == CIFS_LARGE_BUFFER)
4365                         *buf_type = CIFS_LARGE_BUFFER;
4366         }
4367         return rc;
4368 }
4369
4370 /*
4371  * Check the mid_state and signature on received buffer (if any), and queue the
4372  * workqueue completion task.
4373  */
4374 static void
4375 smb2_writev_callback(struct mid_q_entry *mid)
4376 {
4377         struct cifs_writedata *wdata = mid->callback_data;
4378         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4379         struct TCP_Server_Info *server = wdata->server;
4380         unsigned int written;
4381         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4382         struct cifs_credits credits = { .value = 0, .instance = 0 };
4383
4384         WARN_ONCE(wdata->server != mid->server,
4385                   "wdata server %p != mid server %p",
4386                   wdata->server, mid->server);
4387
4388         switch (mid->mid_state) {
4389         case MID_RESPONSE_RECEIVED:
4390                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4391                 credits.instance = server->reconnect_instance;
4392                 wdata->result = smb2_check_receive(mid, server, 0);
4393                 if (wdata->result != 0)
4394                         break;
4395
4396                 written = le32_to_cpu(rsp->DataLength);
4397                 /*
4398                  * Mask off high 16 bits when bytes written as returned
4399                  * by the server is greater than bytes requested by the
4400                  * client. OS/2 servers are known to set incorrect
4401                  * CountHigh values.
4402                  */
4403                 if (written > wdata->bytes)
4404                         written &= 0xFFFF;
4405
4406                 if (written < wdata->bytes)
4407                         wdata->result = -ENOSPC;
4408                 else
4409                         wdata->bytes = written;
4410                 break;
4411         case MID_REQUEST_SUBMITTED:
4412         case MID_RETRY_NEEDED:
4413                 wdata->result = -EAGAIN;
4414                 break;
4415         case MID_RESPONSE_MALFORMED:
4416                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4417                 credits.instance = server->reconnect_instance;
4418                 fallthrough;
4419         default:
4420                 wdata->result = -EIO;
4421                 break;
4422         }
4423 #ifdef CONFIG_CIFS_SMB_DIRECT
4424         /*
4425          * If this wdata has a memory registered, the MR can be freed
4426          * The number of MRs available is limited, it's important to recover
4427          * used MR as soon as I/O is finished. Hold MR longer in the later
4428          * I/O process can possibly result in I/O deadlock due to lack of MR
4429          * to send request on I/O retry
4430          */
4431         if (wdata->mr) {
4432                 smbd_deregister_mr(wdata->mr);
4433                 wdata->mr = NULL;
4434         }
4435 #endif
4436         if (wdata->result) {
4437                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4438                 trace_smb3_write_err(0 /* no xid */,
4439                                      wdata->cfile->fid.persistent_fid,
4440                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4441                                      wdata->bytes, wdata->result);
4442                 if (wdata->result == -ENOSPC)
4443                         pr_warn_once("Out of space writing to %s\n",
4444                                      tcon->tree_name);
4445         } else
4446                 trace_smb3_write_done(0 /* no xid */,
4447                                       wdata->cfile->fid.persistent_fid,
4448                                       tcon->tid, tcon->ses->Suid,
4449                                       wdata->offset, wdata->bytes);
4450
4451         queue_work(cifsiod_wq, &wdata->work);
4452         release_mid(mid);
4453         add_credits(server, &credits, 0);
4454 }
4455
4456 /* smb2_async_writev - send an async write, and set up mid to handle result */
4457 int
4458 smb2_async_writev(struct cifs_writedata *wdata,
4459                   void (*release)(struct kref *kref))
4460 {
4461         int rc = -EACCES, flags = 0;
4462         struct smb2_write_req *req = NULL;
4463         struct smb2_hdr *shdr;
4464         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4465         struct TCP_Server_Info *server = wdata->server;
4466         struct kvec iov[1];
4467         struct smb_rqst rqst = { };
4468         unsigned int total_len;
4469         struct cifs_io_parms _io_parms;
4470         struct cifs_io_parms *io_parms = NULL;
4471
4472         if (!wdata->server)
4473                 server = wdata->server = cifs_pick_channel(tcon->ses);
4474
4475         /*
4476          * in future we may get cifs_io_parms passed in from the caller,
4477          * but for now we construct it here...
4478          */
4479         _io_parms = (struct cifs_io_parms) {
4480                 .tcon = tcon,
4481                 .server = server,
4482                 .offset = wdata->offset,
4483                 .length = wdata->bytes,
4484                 .persistent_fid = wdata->cfile->fid.persistent_fid,
4485                 .volatile_fid = wdata->cfile->fid.volatile_fid,
4486                 .pid = wdata->pid,
4487         };
4488         io_parms = &_io_parms;
4489
4490         rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4491                                  (void **) &req, &total_len);
4492         if (rc)
4493                 return rc;
4494
4495         if (smb3_encryption_required(tcon))
4496                 flags |= CIFS_TRANSFORM_REQ;
4497
4498         shdr = (struct smb2_hdr *)req;
4499         shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4500
4501         req->PersistentFileId = io_parms->persistent_fid;
4502         req->VolatileFileId = io_parms->volatile_fid;
4503         req->WriteChannelInfoOffset = 0;
4504         req->WriteChannelInfoLength = 0;
4505         req->Channel = SMB2_CHANNEL_NONE;
4506         req->Offset = cpu_to_le64(io_parms->offset);
4507         req->DataOffset = cpu_to_le16(
4508                                 offsetof(struct smb2_write_req, Buffer));
4509         req->RemainingBytes = 0;
4510
4511         trace_smb3_write_enter(0 /* xid */,
4512                                io_parms->persistent_fid,
4513                                io_parms->tcon->tid,
4514                                io_parms->tcon->ses->Suid,
4515                                io_parms->offset,
4516                                io_parms->length);
4517
4518 #ifdef CONFIG_CIFS_SMB_DIRECT
4519         /*
4520          * If we want to do a server RDMA read, fill in and append
4521          * smbd_buffer_descriptor_v1 to the end of write request
4522          */
4523         if (smb3_use_rdma_offload(io_parms)) {
4524                 struct smbd_buffer_descriptor_v1 *v1;
4525                 size_t data_size = iov_iter_count(&wdata->iter);
4526                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4527
4528                 wdata->mr = smbd_register_mr(server->smbd_conn, &wdata->iter,
4529                                              false, need_invalidate);
4530                 if (!wdata->mr) {
4531                         rc = -EAGAIN;
4532                         goto async_writev_out;
4533                 }
4534                 req->Length = 0;
4535                 req->DataOffset = 0;
4536                 req->RemainingBytes = cpu_to_le32(data_size);
4537                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4538                 if (need_invalidate)
4539                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4540                 req->WriteChannelInfoOffset =
4541                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4542                 req->WriteChannelInfoLength =
4543                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4544                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4545                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4546                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4547                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4548         }
4549 #endif
4550         iov[0].iov_len = total_len - 1;
4551         iov[0].iov_base = (char *)req;
4552
4553         rqst.rq_iov = iov;
4554         rqst.rq_nvec = 1;
4555         rqst.rq_iter = wdata->iter;
4556         rqst.rq_iter_size = iov_iter_count(&rqst.rq_iter);
4557 #ifdef CONFIG_CIFS_SMB_DIRECT
4558         if (wdata->mr)
4559                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4560 #endif
4561         cifs_dbg(FYI, "async write at %llu %u bytes iter=%zx\n",
4562                  io_parms->offset, io_parms->length, iov_iter_count(&rqst.rq_iter));
4563
4564 #ifdef CONFIG_CIFS_SMB_DIRECT
4565         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4566         if (!wdata->mr)
4567                 req->Length = cpu_to_le32(io_parms->length);
4568 #else
4569         req->Length = cpu_to_le32(io_parms->length);
4570 #endif
4571
4572         if (wdata->credits.value > 0) {
4573                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4574                                                     SMB2_MAX_BUFFER_SIZE));
4575                 shdr->CreditRequest = cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 8);
4576
4577                 rc = adjust_credits(server, &wdata->credits, io_parms->length);
4578                 if (rc)
4579                         goto async_writev_out;
4580
4581                 flags |= CIFS_HAS_CREDITS;
4582         }
4583
4584         kref_get(&wdata->refcount);
4585         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4586                              wdata, flags, &wdata->credits);
4587
4588         if (rc) {
4589                 trace_smb3_write_err(0 /* no xid */,
4590                                      io_parms->persistent_fid,
4591                                      io_parms->tcon->tid,
4592                                      io_parms->tcon->ses->Suid,
4593                                      io_parms->offset,
4594                                      io_parms->length,
4595                                      rc);
4596                 kref_put(&wdata->refcount, release);
4597                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4598         }
4599
4600 async_writev_out:
4601         cifs_small_buf_release(req);
4602         return rc;
4603 }
4604
4605 /*
4606  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4607  * The length field from io_parms must be at least 1 and indicates a number of
4608  * elements with data to write that begins with position 1 in iov array. All
4609  * data length is specified by count.
4610  */
4611 int
4612 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4613            unsigned int *nbytes, struct kvec *iov, int n_vec)
4614 {
4615         struct smb_rqst rqst;
4616         int rc = 0;
4617         struct smb2_write_req *req = NULL;
4618         struct smb2_write_rsp *rsp = NULL;
4619         int resp_buftype;
4620         struct kvec rsp_iov;
4621         int flags = 0;
4622         unsigned int total_len;
4623         struct TCP_Server_Info *server;
4624
4625         *nbytes = 0;
4626
4627         if (n_vec < 1)
4628                 return rc;
4629
4630         if (!io_parms->server)
4631                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4632         server = io_parms->server;
4633         if (server == NULL)
4634                 return -ECONNABORTED;
4635
4636         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
4637                                  (void **) &req, &total_len);
4638         if (rc)
4639                 return rc;
4640
4641         if (smb3_encryption_required(io_parms->tcon))
4642                 flags |= CIFS_TRANSFORM_REQ;
4643
4644         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4645
4646         req->PersistentFileId = io_parms->persistent_fid;
4647         req->VolatileFileId = io_parms->volatile_fid;
4648         req->WriteChannelInfoOffset = 0;
4649         req->WriteChannelInfoLength = 0;
4650         req->Channel = 0;
4651         req->Length = cpu_to_le32(io_parms->length);
4652         req->Offset = cpu_to_le64(io_parms->offset);
4653         req->DataOffset = cpu_to_le16(
4654                                 offsetof(struct smb2_write_req, Buffer));
4655         req->RemainingBytes = 0;
4656
4657         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4658                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4659                 io_parms->offset, io_parms->length);
4660
4661         iov[0].iov_base = (char *)req;
4662         /* 1 for Buffer */
4663         iov[0].iov_len = total_len - 1;
4664
4665         memset(&rqst, 0, sizeof(struct smb_rqst));
4666         rqst.rq_iov = iov;
4667         rqst.rq_nvec = n_vec + 1;
4668
4669         rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
4670                             &rqst,
4671                             &resp_buftype, flags, &rsp_iov);
4672         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4673
4674         if (rc) {
4675                 trace_smb3_write_err(xid,
4676                                      req->PersistentFileId,
4677                                      io_parms->tcon->tid,
4678                                      io_parms->tcon->ses->Suid,
4679                                      io_parms->offset, io_parms->length, rc);
4680                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4681                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4682         } else {
4683                 *nbytes = le32_to_cpu(rsp->DataLength);
4684                 trace_smb3_write_done(xid,
4685                                       req->PersistentFileId,
4686                                       io_parms->tcon->tid,
4687                                       io_parms->tcon->ses->Suid,
4688                                       io_parms->offset, *nbytes);
4689         }
4690
4691         cifs_small_buf_release(req);
4692         free_rsp_buf(resp_buftype, rsp);
4693         return rc;
4694 }
4695
4696 int posix_info_sid_size(const void *beg, const void *end)
4697 {
4698         size_t subauth;
4699         int total;
4700
4701         if (beg + 1 > end)
4702                 return -1;
4703
4704         subauth = *(u8 *)(beg+1);
4705         if (subauth < 1 || subauth > 15)
4706                 return -1;
4707
4708         total = 1 + 1 + 6 + 4*subauth;
4709         if (beg + total > end)
4710                 return -1;
4711
4712         return total;
4713 }
4714
4715 int posix_info_parse(const void *beg, const void *end,
4716                      struct smb2_posix_info_parsed *out)
4717
4718 {
4719         int total_len = 0;
4720         int owner_len, group_len;
4721         int name_len;
4722         const void *owner_sid;
4723         const void *group_sid;
4724         const void *name;
4725
4726         /* if no end bound given, assume payload to be correct */
4727         if (!end) {
4728                 const struct smb2_posix_info *p = beg;
4729
4730                 end = beg + le32_to_cpu(p->NextEntryOffset);
4731                 /* last element will have a 0 offset, pick a sensible bound */
4732                 if (end == beg)
4733                         end += 0xFFFF;
4734         }
4735
4736         /* check base buf */
4737         if (beg + sizeof(struct smb2_posix_info) > end)
4738                 return -1;
4739         total_len = sizeof(struct smb2_posix_info);
4740
4741         /* check owner sid */
4742         owner_sid = beg + total_len;
4743         owner_len = posix_info_sid_size(owner_sid, end);
4744         if (owner_len < 0)
4745                 return -1;
4746         total_len += owner_len;
4747
4748         /* check group sid */
4749         group_sid = beg + total_len;
4750         group_len = posix_info_sid_size(group_sid, end);
4751         if (group_len < 0)
4752                 return -1;
4753         total_len += group_len;
4754
4755         /* check name len */
4756         if (beg + total_len + 4 > end)
4757                 return -1;
4758         name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
4759         if (name_len < 1 || name_len > 0xFFFF)
4760                 return -1;
4761         total_len += 4;
4762
4763         /* check name */
4764         name = beg + total_len;
4765         if (name + name_len > end)
4766                 return -1;
4767         total_len += name_len;
4768
4769         if (out) {
4770                 out->base = beg;
4771                 out->size = total_len;
4772                 out->name_len = name_len;
4773                 out->name = name;
4774                 memcpy(&out->owner, owner_sid, owner_len);
4775                 memcpy(&out->group, group_sid, group_len);
4776         }
4777         return total_len;
4778 }
4779
4780 static int posix_info_extra_size(const void *beg, const void *end)
4781 {
4782         int len = posix_info_parse(beg, end, NULL);
4783
4784         if (len < 0)
4785                 return -1;
4786         return len - sizeof(struct smb2_posix_info);
4787 }
4788
4789 static unsigned int
4790 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
4791             size_t size)
4792 {
4793         int len;
4794         unsigned int entrycount = 0;
4795         unsigned int next_offset = 0;
4796         char *entryptr;
4797         FILE_DIRECTORY_INFO *dir_info;
4798
4799         if (bufstart == NULL)
4800                 return 0;
4801
4802         entryptr = bufstart;
4803
4804         while (1) {
4805                 if (entryptr + next_offset < entryptr ||
4806                     entryptr + next_offset > end_of_buf ||
4807                     entryptr + next_offset + size > end_of_buf) {
4808                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4809                         break;
4810                 }
4811
4812                 entryptr = entryptr + next_offset;
4813                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4814
4815                 if (infotype == SMB_FIND_FILE_POSIX_INFO)
4816                         len = posix_info_extra_size(entryptr, end_of_buf);
4817                 else
4818                         len = le32_to_cpu(dir_info->FileNameLength);
4819
4820                 if (len < 0 ||
4821                     entryptr + len < entryptr ||
4822                     entryptr + len > end_of_buf ||
4823                     entryptr + len + size > end_of_buf) {
4824                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4825                                  end_of_buf);
4826                         break;
4827                 }
4828
4829                 *lastentry = entryptr;
4830                 entrycount++;
4831
4832                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4833                 if (!next_offset)
4834                         break;
4835         }
4836
4837         return entrycount;
4838 }
4839
4840 /*
4841  * Readdir/FindFirst
4842  */
4843 int SMB2_query_directory_init(const unsigned int xid,
4844                               struct cifs_tcon *tcon,
4845                               struct TCP_Server_Info *server,
4846                               struct smb_rqst *rqst,
4847                               u64 persistent_fid, u64 volatile_fid,
4848                               int index, int info_level)
4849 {
4850         struct smb2_query_directory_req *req;
4851         unsigned char *bufptr;
4852         __le16 asteriks = cpu_to_le16('*');
4853         unsigned int output_size = CIFSMaxBufSize -
4854                 MAX_SMB2_CREATE_RESPONSE_SIZE -
4855                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
4856         unsigned int total_len;
4857         struct kvec *iov = rqst->rq_iov;
4858         int len, rc;
4859
4860         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
4861                                  (void **) &req, &total_len);
4862         if (rc)
4863                 return rc;
4864
4865         switch (info_level) {
4866         case SMB_FIND_FILE_DIRECTORY_INFO:
4867                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4868                 break;
4869         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4870                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4871                 break;
4872         case SMB_FIND_FILE_POSIX_INFO:
4873                 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
4874                 break;
4875         default:
4876                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4877                         info_level);
4878                 return -EINVAL;
4879         }
4880
4881         req->FileIndex = cpu_to_le32(index);
4882         req->PersistentFileId = persistent_fid;
4883         req->VolatileFileId = volatile_fid;
4884
4885         len = 0x2;
4886         bufptr = req->Buffer;
4887         memcpy(bufptr, &asteriks, len);
4888
4889         req->FileNameOffset =
4890                 cpu_to_le16(sizeof(struct smb2_query_directory_req));
4891         req->FileNameLength = cpu_to_le16(len);
4892         /*
4893          * BB could be 30 bytes or so longer if we used SMB2 specific
4894          * buffer lengths, but this is safe and close enough.
4895          */
4896         output_size = min_t(unsigned int, output_size, server->maxBuf);
4897         output_size = min_t(unsigned int, output_size, 2 << 15);
4898         req->OutputBufferLength = cpu_to_le32(output_size);
4899
4900         iov[0].iov_base = (char *)req;
4901         /* 1 for Buffer */
4902         iov[0].iov_len = total_len - 1;
4903
4904         iov[1].iov_base = (char *)(req->Buffer);
4905         iov[1].iov_len = len;
4906
4907         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4908                         tcon->ses->Suid, index, output_size);
4909
4910         return 0;
4911 }
4912
4913 void SMB2_query_directory_free(struct smb_rqst *rqst)
4914 {
4915         if (rqst && rqst->rq_iov) {
4916                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4917         }
4918 }
4919
4920 int
4921 smb2_parse_query_directory(struct cifs_tcon *tcon,
4922                            struct kvec *rsp_iov,
4923                            int resp_buftype,
4924                            struct cifs_search_info *srch_inf)
4925 {
4926         struct smb2_query_directory_rsp *rsp;
4927         size_t info_buf_size;
4928         char *end_of_smb;
4929         int rc;
4930
4931         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4932
4933         switch (srch_inf->info_level) {
4934         case SMB_FIND_FILE_DIRECTORY_INFO:
4935                 info_buf_size = sizeof(FILE_DIRECTORY_INFO);
4936                 break;
4937         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4938                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO);
4939                 break;
4940         case SMB_FIND_FILE_POSIX_INFO:
4941                 /* note that posix payload are variable size */
4942                 info_buf_size = sizeof(struct smb2_posix_info);
4943                 break;
4944         default:
4945                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4946                          srch_inf->info_level);
4947                 return -EINVAL;
4948         }
4949
4950         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4951                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4952                                info_buf_size);
4953         if (rc) {
4954                 cifs_tcon_dbg(VFS, "bad info payload");
4955                 return rc;
4956         }
4957
4958         srch_inf->unicode = true;
4959
4960         if (srch_inf->ntwrk_buf_start) {
4961                 if (srch_inf->smallBuf)
4962                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
4963                 else
4964                         cifs_buf_release(srch_inf->ntwrk_buf_start);
4965         }
4966         srch_inf->ntwrk_buf_start = (char *)rsp;
4967         srch_inf->srch_entries_start = srch_inf->last_entry =
4968                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
4969         end_of_smb = rsp_iov->iov_len + (char *)rsp;
4970
4971         srch_inf->entries_in_buffer = num_entries(
4972                 srch_inf->info_level,
4973                 srch_inf->srch_entries_start,
4974                 end_of_smb,
4975                 &srch_inf->last_entry,
4976                 info_buf_size);
4977
4978         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
4979         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
4980                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
4981                  srch_inf->srch_entries_start, srch_inf->last_entry);
4982         if (resp_buftype == CIFS_LARGE_BUFFER)
4983                 srch_inf->smallBuf = false;
4984         else if (resp_buftype == CIFS_SMALL_BUFFER)
4985                 srch_inf->smallBuf = true;
4986         else
4987                 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
4988
4989         return 0;
4990 }
4991
4992 int
4993 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
4994                      u64 persistent_fid, u64 volatile_fid, int index,
4995                      struct cifs_search_info *srch_inf)
4996 {
4997         struct smb_rqst rqst;
4998         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
4999         struct smb2_query_directory_rsp *rsp = NULL;
5000         int resp_buftype = CIFS_NO_BUFFER;
5001         struct kvec rsp_iov;
5002         int rc = 0;
5003         struct cifs_ses *ses = tcon->ses;
5004         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5005         int flags = 0;
5006
5007         if (!ses || !(ses->server))
5008                 return -EIO;
5009
5010         if (smb3_encryption_required(tcon))
5011                 flags |= CIFS_TRANSFORM_REQ;
5012
5013         memset(&rqst, 0, sizeof(struct smb_rqst));
5014         memset(&iov, 0, sizeof(iov));
5015         rqst.rq_iov = iov;
5016         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
5017
5018         rc = SMB2_query_directory_init(xid, tcon, server,
5019                                        &rqst, persistent_fid,
5020                                        volatile_fid, index,
5021                                        srch_inf->info_level);
5022         if (rc)
5023                 goto qdir_exit;
5024
5025         rc = cifs_send_recv(xid, ses, server,
5026                             &rqst, &resp_buftype, flags, &rsp_iov);
5027         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
5028
5029         if (rc) {
5030                 if (rc == -ENODATA &&
5031                     rsp->hdr.Status == STATUS_NO_MORE_FILES) {
5032                         trace_smb3_query_dir_done(xid, persistent_fid,
5033                                 tcon->tid, tcon->ses->Suid, index, 0);
5034                         srch_inf->endOfSearch = true;
5035                         rc = 0;
5036                 } else {
5037                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5038                                 tcon->ses->Suid, index, 0, rc);
5039                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
5040                 }
5041                 goto qdir_exit;
5042         }
5043
5044         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
5045                                         srch_inf);
5046         if (rc) {
5047                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5048                         tcon->ses->Suid, index, 0, rc);
5049                 goto qdir_exit;
5050         }
5051         resp_buftype = CIFS_NO_BUFFER;
5052
5053         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
5054                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
5055
5056 qdir_exit:
5057         SMB2_query_directory_free(&rqst);
5058         free_rsp_buf(resp_buftype, rsp);
5059         return rc;
5060 }
5061
5062 int
5063 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
5064                    struct smb_rqst *rqst,
5065                    u64 persistent_fid, u64 volatile_fid, u32 pid,
5066                    u8 info_class, u8 info_type, u32 additional_info,
5067                    void **data, unsigned int *size)
5068 {
5069         struct smb2_set_info_req *req;
5070         struct kvec *iov = rqst->rq_iov;
5071         unsigned int i, total_len;
5072         int rc;
5073
5074         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
5075                                  (void **) &req, &total_len);
5076         if (rc)
5077                 return rc;
5078
5079         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
5080         req->InfoType = info_type;
5081         req->FileInfoClass = info_class;
5082         req->PersistentFileId = persistent_fid;
5083         req->VolatileFileId = volatile_fid;
5084         req->AdditionalInformation = cpu_to_le32(additional_info);
5085
5086         req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req));
5087         req->BufferLength = cpu_to_le32(*size);
5088
5089         memcpy(req->Buffer, *data, *size);
5090         total_len += *size;
5091
5092         iov[0].iov_base = (char *)req;
5093         /* 1 for Buffer */
5094         iov[0].iov_len = total_len - 1;
5095
5096         for (i = 1; i < rqst->rq_nvec; i++) {
5097                 le32_add_cpu(&req->BufferLength, size[i]);
5098                 iov[i].iov_base = (char *)data[i];
5099                 iov[i].iov_len = size[i];
5100         }
5101
5102         return 0;
5103 }
5104
5105 void
5106 SMB2_set_info_free(struct smb_rqst *rqst)
5107 {
5108         if (rqst && rqst->rq_iov)
5109                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
5110 }
5111
5112 static int
5113 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
5114                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
5115                u8 info_type, u32 additional_info, unsigned int num,
5116                 void **data, unsigned int *size)
5117 {
5118         struct smb_rqst rqst;
5119         struct smb2_set_info_rsp *rsp = NULL;
5120         struct kvec *iov;
5121         struct kvec rsp_iov;
5122         int rc = 0;
5123         int resp_buftype;
5124         struct cifs_ses *ses = tcon->ses;
5125         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5126         int flags = 0;
5127
5128         if (!ses || !server)
5129                 return -EIO;
5130
5131         if (!num)
5132                 return -EINVAL;
5133
5134         if (smb3_encryption_required(tcon))
5135                 flags |= CIFS_TRANSFORM_REQ;
5136
5137         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
5138         if (!iov)
5139                 return -ENOMEM;
5140
5141         memset(&rqst, 0, sizeof(struct smb_rqst));
5142         rqst.rq_iov = iov;
5143         rqst.rq_nvec = num;
5144
5145         rc = SMB2_set_info_init(tcon, server,
5146                                 &rqst, persistent_fid, volatile_fid, pid,
5147                                 info_class, info_type, additional_info,
5148                                 data, size);
5149         if (rc) {
5150                 kfree(iov);
5151                 return rc;
5152         }
5153
5154
5155         rc = cifs_send_recv(xid, ses, server,
5156                             &rqst, &resp_buftype, flags,
5157                             &rsp_iov);
5158         SMB2_set_info_free(&rqst);
5159         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
5160
5161         if (rc != 0) {
5162                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
5163                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
5164                                 ses->Suid, info_class, (__u32)info_type, rc);
5165         }
5166
5167         free_rsp_buf(resp_buftype, rsp);
5168         kfree(iov);
5169         return rc;
5170 }
5171
5172 int
5173 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
5174              u64 volatile_fid, u32 pid, __le64 *eof)
5175 {
5176         struct smb2_file_eof_info info;
5177         void *data;
5178         unsigned int size;
5179
5180         info.EndOfFile = *eof;
5181
5182         data = &info;
5183         size = sizeof(struct smb2_file_eof_info);
5184
5185         trace_smb3_set_eof(xid, persistent_fid, tcon->tid, tcon->ses->Suid, le64_to_cpu(*eof));
5186
5187         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5188                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
5189                         0, 1, &data, &size);
5190 }
5191
5192 int
5193 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
5194                 u64 persistent_fid, u64 volatile_fid,
5195                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
5196 {
5197         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5198                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
5199                         1, (void **)&pnntsd, &pacllen);
5200 }
5201
5202 int
5203 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
5204             u64 persistent_fid, u64 volatile_fid,
5205             struct smb2_file_full_ea_info *buf, int len)
5206 {
5207         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5208                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
5209                 0, 1, (void **)&buf, &len);
5210 }
5211
5212 int
5213 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
5214                   const u64 persistent_fid, const u64 volatile_fid,
5215                   __u8 oplock_level)
5216 {
5217         struct smb_rqst rqst;
5218         int rc;
5219         struct smb2_oplock_break *req = NULL;
5220         struct cifs_ses *ses = tcon->ses;
5221         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5222         int flags = CIFS_OBREAK_OP;
5223         unsigned int total_len;
5224         struct kvec iov[1];
5225         struct kvec rsp_iov;
5226         int resp_buf_type;
5227
5228         cifs_dbg(FYI, "SMB2_oplock_break\n");
5229         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5230                                  (void **) &req, &total_len);
5231         if (rc)
5232                 return rc;
5233
5234         if (smb3_encryption_required(tcon))
5235                 flags |= CIFS_TRANSFORM_REQ;
5236
5237         req->VolatileFid = volatile_fid;
5238         req->PersistentFid = persistent_fid;
5239         req->OplockLevel = oplock_level;
5240         req->hdr.CreditRequest = cpu_to_le16(1);
5241
5242         flags |= CIFS_NO_RSP_BUF;
5243
5244         iov[0].iov_base = (char *)req;
5245         iov[0].iov_len = total_len;
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_buf_type, flags, &rsp_iov);
5253         cifs_small_buf_release(req);
5254
5255         if (rc) {
5256                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5257                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5258         }
5259
5260         return rc;
5261 }
5262
5263 void
5264 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5265                              struct kstatfs *kst)
5266 {
5267         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5268                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5269         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5270         kst->f_bfree  = kst->f_bavail =
5271                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5272         return;
5273 }
5274
5275 static void
5276 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5277                         struct kstatfs *kst)
5278 {
5279         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5280         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5281         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5282         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5283                 kst->f_bavail = kst->f_bfree;
5284         else
5285                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5286         if (response_data->TotalFileNodes != cpu_to_le64(-1))
5287                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5288         if (response_data->FreeFileNodes != cpu_to_le64(-1))
5289                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5290
5291         return;
5292 }
5293
5294 static int
5295 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5296                    struct TCP_Server_Info *server,
5297                    int level, int outbuf_len, u64 persistent_fid,
5298                    u64 volatile_fid)
5299 {
5300         int rc;
5301         struct smb2_query_info_req *req;
5302         unsigned int total_len;
5303
5304         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5305
5306         if ((tcon->ses == NULL) || server == NULL)
5307                 return -EIO;
5308
5309         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5310                                  (void **) &req, &total_len);
5311         if (rc)
5312                 return rc;
5313
5314         req->InfoType = SMB2_O_INFO_FILESYSTEM;
5315         req->FileInfoClass = level;
5316         req->PersistentFileId = persistent_fid;
5317         req->VolatileFileId = volatile_fid;
5318         /* 1 for pad */
5319         req->InputBufferOffset =
5320                         cpu_to_le16(sizeof(struct smb2_query_info_req));
5321         req->OutputBufferLength = cpu_to_le32(
5322                 outbuf_len + sizeof(struct smb2_query_info_rsp));
5323
5324         iov->iov_base = (char *)req;
5325         iov->iov_len = total_len;
5326         return 0;
5327 }
5328
5329 int
5330 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5331               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5332 {
5333         struct smb_rqst rqst;
5334         struct smb2_query_info_rsp *rsp = NULL;
5335         struct kvec iov;
5336         struct kvec rsp_iov;
5337         int rc = 0;
5338         int resp_buftype;
5339         struct cifs_ses *ses = tcon->ses;
5340         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5341         FILE_SYSTEM_POSIX_INFO *info = NULL;
5342         int flags = 0;
5343
5344         rc = build_qfs_info_req(&iov, tcon, server,
5345                                 FS_POSIX_INFORMATION,
5346                                 sizeof(FILE_SYSTEM_POSIX_INFO),
5347                                 persistent_fid, volatile_fid);
5348         if (rc)
5349                 return rc;
5350
5351         if (smb3_encryption_required(tcon))
5352                 flags |= CIFS_TRANSFORM_REQ;
5353
5354         memset(&rqst, 0, sizeof(struct smb_rqst));
5355         rqst.rq_iov = &iov;
5356         rqst.rq_nvec = 1;
5357
5358         rc = cifs_send_recv(xid, ses, server,
5359                             &rqst, &resp_buftype, flags, &rsp_iov);
5360         cifs_small_buf_release(iov.iov_base);
5361         if (rc) {
5362                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5363                 goto posix_qfsinf_exit;
5364         }
5365         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5366
5367         info = (FILE_SYSTEM_POSIX_INFO *)(
5368                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5369         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5370                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5371                                sizeof(FILE_SYSTEM_POSIX_INFO));
5372         if (!rc)
5373                 copy_posix_fs_info_to_kstatfs(info, fsdata);
5374
5375 posix_qfsinf_exit:
5376         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5377         return rc;
5378 }
5379
5380 int
5381 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5382               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5383 {
5384         struct smb_rqst rqst;
5385         struct smb2_query_info_rsp *rsp = NULL;
5386         struct kvec iov;
5387         struct kvec rsp_iov;
5388         int rc = 0;
5389         int resp_buftype;
5390         struct cifs_ses *ses = tcon->ses;
5391         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5392         struct smb2_fs_full_size_info *info = NULL;
5393         int flags = 0;
5394
5395         rc = build_qfs_info_req(&iov, tcon, server,
5396                                 FS_FULL_SIZE_INFORMATION,
5397                                 sizeof(struct smb2_fs_full_size_info),
5398                                 persistent_fid, volatile_fid);
5399         if (rc)
5400                 return rc;
5401
5402         if (smb3_encryption_required(tcon))
5403                 flags |= CIFS_TRANSFORM_REQ;
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_buftype, flags, &rsp_iov);
5411         cifs_small_buf_release(iov.iov_base);
5412         if (rc) {
5413                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5414                 goto qfsinf_exit;
5415         }
5416         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5417
5418         info = (struct smb2_fs_full_size_info *)(
5419                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5420         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5421                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5422                                sizeof(struct smb2_fs_full_size_info));
5423         if (!rc)
5424                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5425
5426 qfsinf_exit:
5427         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5428         return rc;
5429 }
5430
5431 int
5432 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5433               u64 persistent_fid, u64 volatile_fid, int level)
5434 {
5435         struct smb_rqst rqst;
5436         struct smb2_query_info_rsp *rsp = NULL;
5437         struct kvec iov;
5438         struct kvec rsp_iov;
5439         int rc = 0;
5440         int resp_buftype, max_len, min_len;
5441         struct cifs_ses *ses = tcon->ses;
5442         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5443         unsigned int rsp_len, offset;
5444         int flags = 0;
5445
5446         if (level == FS_DEVICE_INFORMATION) {
5447                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5448                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5449         } else if (level == FS_ATTRIBUTE_INFORMATION) {
5450                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5451                 min_len = MIN_FS_ATTR_INFO_SIZE;
5452         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5453                 max_len = sizeof(struct smb3_fs_ss_info);
5454                 min_len = sizeof(struct smb3_fs_ss_info);
5455         } else if (level == FS_VOLUME_INFORMATION) {
5456                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5457                 min_len = sizeof(struct smb3_fs_vol_info);
5458         } else {
5459                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5460                 return -EINVAL;
5461         }
5462
5463         rc = build_qfs_info_req(&iov, tcon, server,
5464                                 level, max_len,
5465                                 persistent_fid, volatile_fid);
5466         if (rc)
5467                 return rc;
5468
5469         if (smb3_encryption_required(tcon))
5470                 flags |= CIFS_TRANSFORM_REQ;
5471
5472         memset(&rqst, 0, sizeof(struct smb_rqst));
5473         rqst.rq_iov = &iov;
5474         rqst.rq_nvec = 1;
5475
5476         rc = cifs_send_recv(xid, ses, server,
5477                             &rqst, &resp_buftype, flags, &rsp_iov);
5478         cifs_small_buf_release(iov.iov_base);
5479         if (rc) {
5480                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5481                 goto qfsattr_exit;
5482         }
5483         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5484
5485         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5486         offset = le16_to_cpu(rsp->OutputBufferOffset);
5487         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5488         if (rc)
5489                 goto qfsattr_exit;
5490
5491         if (level == FS_ATTRIBUTE_INFORMATION)
5492                 memcpy(&tcon->fsAttrInfo, offset
5493                         + (char *)rsp, min_t(unsigned int,
5494                         rsp_len, max_len));
5495         else if (level == FS_DEVICE_INFORMATION)
5496                 memcpy(&tcon->fsDevInfo, offset
5497                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5498         else if (level == FS_SECTOR_SIZE_INFORMATION) {
5499                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5500                         (offset + (char *)rsp);
5501                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5502                 tcon->perf_sector_size =
5503                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5504         } else if (level == FS_VOLUME_INFORMATION) {
5505                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5506                         (offset + (char *)rsp);
5507                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5508                 tcon->vol_create_time = vol_info->VolumeCreationTime;
5509         }
5510
5511 qfsattr_exit:
5512         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5513         return rc;
5514 }
5515
5516 int
5517 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5518            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5519            const __u32 num_lock, struct smb2_lock_element *buf)
5520 {
5521         struct smb_rqst rqst;
5522         int rc = 0;
5523         struct smb2_lock_req *req = NULL;
5524         struct kvec iov[2];
5525         struct kvec rsp_iov;
5526         int resp_buf_type;
5527         unsigned int count;
5528         int flags = CIFS_NO_RSP_BUF;
5529         unsigned int total_len;
5530         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5531
5532         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
5533
5534         rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
5535                                  (void **) &req, &total_len);
5536         if (rc)
5537                 return rc;
5538
5539         if (smb3_encryption_required(tcon))
5540                 flags |= CIFS_TRANSFORM_REQ;
5541
5542         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
5543         req->LockCount = cpu_to_le16(num_lock);
5544
5545         req->PersistentFileId = persist_fid;
5546         req->VolatileFileId = volatile_fid;
5547
5548         count = num_lock * sizeof(struct smb2_lock_element);
5549
5550         iov[0].iov_base = (char *)req;
5551         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
5552         iov[1].iov_base = (char *)buf;
5553         iov[1].iov_len = count;
5554
5555         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
5556
5557         memset(&rqst, 0, sizeof(struct smb_rqst));
5558         rqst.rq_iov = iov;
5559         rqst.rq_nvec = 2;
5560
5561         rc = cifs_send_recv(xid, tcon->ses, server,
5562                             &rqst, &resp_buf_type, flags,
5563                             &rsp_iov);
5564         cifs_small_buf_release(req);
5565         if (rc) {
5566                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
5567                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
5568                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
5569                                     tcon->ses->Suid, rc);
5570         }
5571
5572         return rc;
5573 }
5574
5575 int
5576 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5577           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5578           const __u64 length, const __u64 offset, const __u32 lock_flags,
5579           const bool wait)
5580 {
5581         struct smb2_lock_element lock;
5582
5583         lock.Offset = cpu_to_le64(offset);
5584         lock.Length = cpu_to_le64(length);
5585         lock.Flags = cpu_to_le32(lock_flags);
5586         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5587                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5588
5589         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5590 }
5591
5592 int
5593 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5594                  __u8 *lease_key, const __le32 lease_state)
5595 {
5596         struct smb_rqst rqst;
5597         int rc;
5598         struct smb2_lease_ack *req = NULL;
5599         struct cifs_ses *ses = tcon->ses;
5600         int flags = CIFS_OBREAK_OP;
5601         unsigned int total_len;
5602         struct kvec iov[1];
5603         struct kvec rsp_iov;
5604         int resp_buf_type;
5605         __u64 *please_key_high;
5606         __u64 *please_key_low;
5607         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5608
5609         cifs_dbg(FYI, "SMB2_lease_break\n");
5610         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5611                                  (void **) &req, &total_len);
5612         if (rc)
5613                 return rc;
5614
5615         if (smb3_encryption_required(tcon))
5616                 flags |= CIFS_TRANSFORM_REQ;
5617
5618         req->hdr.CreditRequest = cpu_to_le16(1);
5619         req->StructureSize = cpu_to_le16(36);
5620         total_len += 12;
5621
5622         memcpy(req->LeaseKey, lease_key, 16);
5623         req->LeaseState = lease_state;
5624
5625         flags |= CIFS_NO_RSP_BUF;
5626
5627         iov[0].iov_base = (char *)req;
5628         iov[0].iov_len = total_len;
5629
5630         memset(&rqst, 0, sizeof(struct smb_rqst));
5631         rqst.rq_iov = iov;
5632         rqst.rq_nvec = 1;
5633
5634         rc = cifs_send_recv(xid, ses, server,
5635                             &rqst, &resp_buf_type, flags, &rsp_iov);
5636         cifs_small_buf_release(req);
5637
5638         please_key_low = (__u64 *)lease_key;
5639         please_key_high = (__u64 *)(lease_key+8);
5640         if (rc) {
5641                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5642                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5643                         ses->Suid, *please_key_low, *please_key_high, rc);
5644                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5645         } else
5646                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5647                         ses->Suid, *please_key_low, *please_key_high);
5648
5649         return rc;
5650 }