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         struct smb3_hdr_req *smb3_hdr;
  92
  93         shdr->ProtocolId = SMB2_PROTO_NUMBER;
  94         shdr->StructureSize = cpu_to_le16(64);
  95         shdr->Command = smb2_cmd;
  96
  97         if (server) {
  98                 /* After reconnect SMB3 must set ChannelSequence on subsequent reqs */
  99                 if (server->dialect >= SMB30_PROT_ID) {
 100                         smb3_hdr = (struct smb3_hdr_req *)shdr;
 101                         /*
 102                          * if primary channel is not set yet, use default
 103                          * channel for chan sequence num
 104                          */
 105                         if (SERVER_IS_CHAN(server))
 106                                 smb3_hdr->ChannelSequence =
 107                                         cpu_to_le16(server->primary_server->channel_sequence_num);
 108                         else
 109                                 smb3_hdr->ChannelSequence =
 110                                         cpu_to_le16(server->channel_sequence_num);
 111                 }
 112                 spin_lock(&server->req_lock);
 113                 /* Request up to 10 credits but don't go over the limit. */
 114                 if (server->credits >= server->max_credits)
 115                         shdr->CreditRequest = cpu_to_le16(0);
 116                 else
 117                         shdr->CreditRequest = cpu_to_le16(
 118                                 min_t(int, server->max_credits -
 119                                                 server->credits, 10));
 120                 spin_unlock(&server->req_lock);
 121         } else {
 122                 shdr->CreditRequest = cpu_to_le16(2);
 123         }
 124         shdr->Id.SyncId.ProcessId = cpu_to_le32((__u16)current->tgid);
 125
 126         if (!tcon)
 127                 goto out;
 128
 129         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 130         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 131         if (server && (server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 132                 shdr->CreditCharge = cpu_to_le16(1);
 133         /* else CreditCharge MBZ */
 134
 135         shdr->Id.SyncId.TreeId = cpu_to_le32(tcon->tid);
 136         /* Uid is not converted */
 137         if (tcon->ses)
 138                 shdr->SessionId = cpu_to_le64(tcon->ses->Suid);
 139
 140         /*
 141          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 142          * to pass the path on the Open SMB prefixed by \\server\share.
 143          * Not sure when we would need to do the augmented path (if ever) and
 144          * setting this flag breaks the SMB2 open operation since it is
 145          * illegal to send an empty path name (without \\server\share prefix)
 146          * when the DFS flag is set in the SMB open header. We could
 147          * consider setting the flag on all operations other than open
 148          * but it is safer to net set it for now.
 149          */
 150 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 151                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 152
 153         if (server && server->sign && !smb3_encryption_required(tcon))
 154                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 155 out:
 156         return;
 157 }
 158
 159 static int
 160 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
 161                struct TCP_Server_Info *server)
 162 {
 163         int rc = 0;
 164         struct nls_table *nls_codepage = NULL;
 165         struct cifs_ses *ses;
 166
 167         /*
 168          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 169          * check for tcp and smb session status done differently
 170          * for those three - in the calling routine.
 171          */
 172         if (tcon == NULL)
 173                 return 0;
 174
 175         /*
 176          * Need to also skip SMB2_IOCTL because it is used for checking nested dfs links in
 177          * cifs_tree_connect().
 178          */
 179         if (smb2_command == SMB2_TREE_CONNECT || smb2_command == SMB2_IOCTL)
 180                 return 0;
 181
 182         spin_lock(&tcon->tc_lock);
 183         if (tcon->status == TID_EXITING) {
 184                 /*
 185                  * only tree disconnect allowed when disconnecting ...
 186                  */
 187                 if (smb2_command != SMB2_TREE_DISCONNECT) {
 188                         spin_unlock(&tcon->tc_lock);
 189                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 190                                  smb2_command);
 191                         return -ENODEV;
 192                 }
 193         }
 194         spin_unlock(&tcon->tc_lock);
 195
 196         ses = tcon->ses;
 197         if (!ses)
 198                 return -EIO;
 199         spin_lock(&ses->ses_lock);
 200         if (ses->ses_status == SES_EXITING) {
 201                 spin_unlock(&ses->ses_lock);
 202                 return -EIO;
 203         }
 204         spin_unlock(&ses->ses_lock);
 205         if (!ses->server || !server)
 206                 return -EIO;
 207
 208         spin_lock(&server->srv_lock);
 209         if (server->tcpStatus == CifsNeedReconnect) {
 210                 /*
 211                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 212                  * here since they are implicitly done when session drops.
 213                  */
 214                 switch (smb2_command) {
 215                 /*
 216                  * BB Should we keep oplock break and add flush to exceptions?
 217                  */
 218                 case SMB2_TREE_DISCONNECT:
 219                 case SMB2_CANCEL:
 220                 case SMB2_CLOSE:
 221                 case SMB2_OPLOCK_BREAK:
 222                         spin_unlock(&server->srv_lock);
 223                         return -EAGAIN;
 224                 }
 225         }
 226         spin_unlock(&server->srv_lock);
 227
 228 again:
 229         rc = cifs_wait_for_server_reconnect(server, tcon->retry);
 230         if (rc)
 231                 return rc;
 232
 233         spin_lock(&ses->chan_lock);
 234         if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) {
 235                 spin_unlock(&ses->chan_lock);
 236                 return 0;
 237         }
 238         spin_unlock(&ses->chan_lock);
 239         cifs_dbg(FYI, "sess reconnect mask: 0x%lx, tcon reconnect: %d",
 240                  tcon->ses->chans_need_reconnect,
 241                  tcon->need_reconnect);
 242
 243         mutex_lock(&ses->session_mutex);
 244         /*
 245          * Recheck after acquire mutex. If another thread is negotiating
 246          * and the server never sends an answer the socket will be closed
 247          * and tcpStatus set to reconnect.
 248          */
 249         spin_lock(&server->srv_lock);
 250         if (server->tcpStatus == CifsNeedReconnect) {
 251                 spin_unlock(&server->srv_lock);
 252                 mutex_unlock(&ses->session_mutex);
 253
 254                 if (tcon->retry)
 255                         goto again;
 256
 257                 rc = -EHOSTDOWN;
 258                 goto out;
 259         }
 260         spin_unlock(&server->srv_lock);
 261
 262         nls_codepage = ses->local_nls;
 263
 264         /*
 265          * need to prevent multiple threads trying to simultaneously
 266          * reconnect the same SMB session
 267          */
 268         spin_lock(&ses->ses_lock);
 269         spin_lock(&ses->chan_lock);
 270         if (!cifs_chan_needs_reconnect(ses, server) &&
 271             ses->ses_status == SES_GOOD) {
 272                 spin_unlock(&ses->chan_lock);
 273                 spin_unlock(&ses->ses_lock);
 274                 /* this means that we only need to tree connect */
 275                 if (tcon->need_reconnect)
 276                         goto skip_sess_setup;
 277
 278                 mutex_unlock(&ses->session_mutex);
 279                 goto out;
 280         }
 281         spin_unlock(&ses->chan_lock);
 282         spin_unlock(&ses->ses_lock);
 283
 284         rc = cifs_negotiate_protocol(0, ses, server);
 285         if (!rc) {
 286                 rc = cifs_setup_session(0, ses, server, nls_codepage);
 287                 if ((rc == -EACCES) && !tcon->retry) {
 288                         mutex_unlock(&ses->session_mutex);
 289                         rc = -EHOSTDOWN;
 290                         goto failed;
 291                 } else if (rc) {
 292                         mutex_unlock(&ses->session_mutex);
 293                         goto out;
 294                 }
 295         } else {
 296                 mutex_unlock(&ses->session_mutex);
 297                 goto out;
 298         }
 299
 300 skip_sess_setup:
 301         if (!tcon->need_reconnect) {
 302                 mutex_unlock(&ses->session_mutex);
 303                 goto out;
 304         }
 305         cifs_mark_open_files_invalid(tcon);
 306         if (tcon->use_persistent)
 307                 tcon->need_reopen_files = true;
 308
 309         rc = cifs_tree_connect(0, tcon, nls_codepage);
 310         mutex_unlock(&ses->session_mutex);
 311
 312         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 313         if (rc) {
 314                 /* If sess reconnected but tcon didn't, something strange ... */
 315                 cifs_dbg(VFS, "reconnect tcon failed rc = %d\n", rc);
 316                 goto out;
 317         }
 318
 319         if (smb2_command != SMB2_INTERNAL_CMD)
 320                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
 321
 322         atomic_inc(&tconInfoReconnectCount);
 323 out:
 324         /*
 325          * Check if handle based operation so we know whether we can continue
 326          * or not without returning to caller to reset file handle.
 327          */
 328         /*
 329          * BB Is flush done by server on drop of tcp session? Should we special
 330          * case it and skip above?
 331          */
 332         switch (smb2_command) {
 333         case SMB2_FLUSH:
 334         case SMB2_READ:
 335         case SMB2_WRITE:
 336         case SMB2_LOCK:
 337         case SMB2_QUERY_DIRECTORY:
 338         case SMB2_CHANGE_NOTIFY:
 339         case SMB2_QUERY_INFO:
 340         case SMB2_SET_INFO:
 341                 rc = -EAGAIN;
 342         }
 343 failed:
 344         return rc;
 345 }
 346
 347 static void
 348 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon,
 349                struct TCP_Server_Info *server,
 350                void *buf,
 351                unsigned int *total_len)
 352 {
 353         struct smb2_pdu *spdu = buf;
 354         /* lookup word count ie StructureSize from table */
 355         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 356
 357         /*
 358          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 359          * largest operations (Create)
 360          */
 361         memset(buf, 0, 256);
 362
 363         smb2_hdr_assemble(&spdu->hdr, smb2_command, tcon, server);
 364         spdu->StructureSize2 = cpu_to_le16(parmsize);
 365
 366         *total_len = parmsize + sizeof(struct smb2_hdr);
 367 }
 368
 369 /*
 370  * Allocate and return pointer to an SMB request hdr, and set basic
 371  * SMB information in the SMB header. If the return code is zero, this
 372  * function must have filled in request_buf pointer.
 373  */
 374 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 375                                  struct TCP_Server_Info *server,
 376                                  void **request_buf, unsigned int *total_len)
 377 {
 378         /* BB eventually switch this to SMB2 specific small buf size */
 379         if (smb2_command == SMB2_SET_INFO)
 380                 *request_buf = cifs_buf_get();
 381         else
 382                 *request_buf = cifs_small_buf_get();
 383         if (*request_buf == NULL) {
 384                 /* BB should we add a retry in here if not a writepage? */
 385                 return -ENOMEM;
 386         }
 387
 388         fill_small_buf(smb2_command, tcon, server,
 389                        (struct smb2_hdr *)(*request_buf),
 390                        total_len);
 391
 392         if (tcon != NULL) {
 393                 uint16_t com_code = le16_to_cpu(smb2_command);
 394                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 395                 cifs_stats_inc(&tcon->num_smbs_sent);
 396         }
 397
 398         return 0;
 399 }
 400
 401 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 402                                struct TCP_Server_Info *server,
 403                                void **request_buf, unsigned int *total_len)
 404 {
 405         int rc;
 406
 407         rc = smb2_reconnect(smb2_command, tcon, server);
 408         if (rc)
 409                 return rc;
 410
 411         return __smb2_plain_req_init(smb2_command, tcon, server, request_buf,
 412                                      total_len);
 413 }
 414
 415 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 416                                struct TCP_Server_Info *server,
 417                                void **request_buf, unsigned int *total_len)
 418 {
 419         /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
 420         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
 421                 return __smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 422                                              request_buf, total_len);
 423         }
 424         return smb2_plain_req_init(SMB2_IOCTL, tcon, server,
 425                                    request_buf, total_len);
 426 }
 427
 428 /* For explanation of negotiate contexts see MS-SMB2 section 2.2.3.1 */
 429
 430 static void
 431 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 432 {
 433         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 434         pneg_ctxt->DataLength = cpu_to_le16(38);
 435         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 436         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
 437         get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
 438         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 439 }
 440
 441 static void
 442 build_compression_ctxt(struct smb2_compression_capabilities_context *pneg_ctxt)
 443 {
 444         pneg_ctxt->ContextType = SMB2_COMPRESSION_CAPABILITIES;
 445         pneg_ctxt->DataLength =
 446                 cpu_to_le16(sizeof(struct smb2_compression_capabilities_context)
 447                           - sizeof(struct smb2_neg_context));
 448         pneg_ctxt->CompressionAlgorithmCount = cpu_to_le16(3);
 449         pneg_ctxt->CompressionAlgorithms[0] = SMB3_COMPRESS_LZ77;
 450         pneg_ctxt->CompressionAlgorithms[1] = SMB3_COMPRESS_LZ77_HUFF;
 451         pneg_ctxt->CompressionAlgorithms[2] = SMB3_COMPRESS_LZNT1;
 452 }
 453
 454 static unsigned int
 455 build_signing_ctxt(struct smb2_signing_capabilities *pneg_ctxt)
 456 {
 457         unsigned int ctxt_len = sizeof(struct smb2_signing_capabilities);
 458         unsigned short num_algs = 1; /* number of signing algorithms sent */
 459
 460         pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES;
 461         /*
 462          * Context Data length must be rounded to multiple of 8 for some servers
 463          */
 464         pneg_ctxt->DataLength = cpu_to_le16(ALIGN(sizeof(struct smb2_signing_capabilities) -
 465                                             sizeof(struct smb2_neg_context) +
 466                                             (num_algs * sizeof(u16)), 8));
 467         pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(num_algs);
 468         pneg_ctxt->SigningAlgorithms[0] = cpu_to_le16(SIGNING_ALG_AES_CMAC);
 469
 470         ctxt_len += sizeof(__le16) * num_algs;
 471         ctxt_len = ALIGN(ctxt_len, 8);
 472         return ctxt_len;
 473         /* TBD add SIGNING_ALG_AES_GMAC and/or SIGNING_ALG_HMAC_SHA256 */
 474 }
 475
 476 static void
 477 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 478 {
 479         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 480         if (require_gcm_256) {
 481                 pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */
 482                 pneg_ctxt->CipherCount = cpu_to_le16(1);
 483                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM;
 484         } else if (enable_gcm_256) {
 485                 pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */
 486                 pneg_ctxt->CipherCount = cpu_to_le16(3);
 487                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 488                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM;
 489                 pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM;
 490         } else {
 491                 pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */
 492                 pneg_ctxt->CipherCount = cpu_to_le16(2);
 493                 pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;
 494                 pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES128_CCM;
 495         }
 496 }
 497
 498 static unsigned int
 499 build_netname_ctxt(struct smb2_netname_neg_context *pneg_ctxt, char *hostname)
 500 {
 501         struct nls_table *cp = load_nls_default();
 502
 503         pneg_ctxt->ContextType = SMB2_NETNAME_NEGOTIATE_CONTEXT_ID;
 504
 505         /* copy up to max of first 100 bytes of server name to NetName field */
 506         pneg_ctxt->DataLength = cpu_to_le16(2 * cifs_strtoUTF16(pneg_ctxt->NetName, hostname, 100, cp));
 507         /* context size is DataLength + minimal smb2_neg_context */
 508         return ALIGN(le16_to_cpu(pneg_ctxt->DataLength) + sizeof(struct smb2_neg_context), 8);
 509 }
 510
 511 static void
 512 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 513 {
 514         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 515         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 516         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 517         pneg_ctxt->Name[0] = 0x93;
 518         pneg_ctxt->Name[1] = 0xAD;
 519         pneg_ctxt->Name[2] = 0x25;
 520         pneg_ctxt->Name[3] = 0x50;
 521         pneg_ctxt->Name[4] = 0x9C;
 522         pneg_ctxt->Name[5] = 0xB4;
 523         pneg_ctxt->Name[6] = 0x11;
 524         pneg_ctxt->Name[7] = 0xE7;
 525         pneg_ctxt->Name[8] = 0xB4;
 526         pneg_ctxt->Name[9] = 0x23;
 527         pneg_ctxt->Name[10] = 0x83;
 528         pneg_ctxt->Name[11] = 0xDE;
 529         pneg_ctxt->Name[12] = 0x96;
 530         pneg_ctxt->Name[13] = 0x8B;
 531         pneg_ctxt->Name[14] = 0xCD;
 532         pneg_ctxt->Name[15] = 0x7C;
 533 }
 534
 535 static void
 536 assemble_neg_contexts(struct smb2_negotiate_req *req,
 537                       struct TCP_Server_Info *server, unsigned int *total_len)
 538 {
 539         unsigned int ctxt_len, neg_context_count;
 540         struct TCP_Server_Info *pserver;
 541         char *pneg_ctxt;
 542         char *hostname;
 543
 544         if (*total_len > 200) {
 545                 /* In case length corrupted don't want to overrun smb buffer */
 546                 cifs_server_dbg(VFS, "Bad frame length assembling neg contexts\n");
 547                 return;
 548         }
 549
 550         /*
 551          * round up total_len of fixed part of SMB3 negotiate request to 8
 552          * byte boundary before adding negotiate contexts
 553          */
 554         *total_len = ALIGN(*total_len, 8);
 555
 556         pneg_ctxt = (*total_len) + (char *)req;
 557         req->NegotiateContextOffset = cpu_to_le32(*total_len);
 558
 559         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 560         ctxt_len = ALIGN(sizeof(struct smb2_preauth_neg_context), 8);
 561         *total_len += ctxt_len;
 562         pneg_ctxt += ctxt_len;
 563
 564         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 565         ctxt_len = ALIGN(sizeof(struct smb2_encryption_neg_context), 8);
 566         *total_len += ctxt_len;
 567         pneg_ctxt += ctxt_len;
 568
 569         /*
 570          * secondary channels don't have the hostname field populated
 571          * use the hostname field in the primary channel instead
 572          */
 573         pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
 574         cifs_server_lock(pserver);
 575         hostname = pserver->hostname;
 576         if (hostname && (hostname[0] != 0)) {
 577                 ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
 578                                               hostname);
 579                 *total_len += ctxt_len;
 580                 pneg_ctxt += ctxt_len;
 581                 neg_context_count = 3;
 582         } else
 583                 neg_context_count = 2;
 584         cifs_server_unlock(pserver);
 585
 586         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 587         *total_len += sizeof(struct smb2_posix_neg_context);
 588         pneg_ctxt += sizeof(struct smb2_posix_neg_context);
 589         neg_context_count++;
 590
 591         if (server->compress_algorithm) {
 592                 build_compression_ctxt((struct smb2_compression_capabilities_context *)
 593                                 pneg_ctxt);
 594                 ctxt_len = ALIGN(sizeof(struct smb2_compression_capabilities_context), 8);
 595                 *total_len += ctxt_len;
 596                 pneg_ctxt += ctxt_len;
 597                 neg_context_count++;
 598         }
 599
 600         if (enable_negotiate_signing) {
 601                 ctxt_len = build_signing_ctxt((struct smb2_signing_capabilities *)
 602                                 pneg_ctxt);
 603                 *total_len += ctxt_len;
 604                 pneg_ctxt += ctxt_len;
 605                 neg_context_count++;
 606         }
 607
 608         /* check for and add transport_capabilities and signing capabilities */
 609         req->NegotiateContextCount = cpu_to_le16(neg_context_count);
 610
 611 }
 612
 613 /* If invalid preauth context warn but use what we requested, SHA-512 */
 614 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 615 {
 616         unsigned int len = le16_to_cpu(ctxt->DataLength);
 617
 618         /*
 619          * Caller checked that DataLength remains within SMB boundary. We still
 620          * need to confirm that one HashAlgorithms member is accounted for.
 621          */
 622         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 623                 pr_warn_once("server sent bad preauth context\n");
 624                 return;
 625         } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
 626                 pr_warn_once("server sent invalid SaltLength\n");
 627                 return;
 628         }
 629         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 630                 pr_warn_once("Invalid SMB3 hash algorithm count\n");
 631         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 632                 pr_warn_once("unknown SMB3 hash algorithm\n");
 633 }
 634
 635 static void decode_compress_ctx(struct TCP_Server_Info *server,
 636                          struct smb2_compression_capabilities_context *ctxt)
 637 {
 638         unsigned int len = le16_to_cpu(ctxt->DataLength);
 639
 640         /*
 641          * Caller checked that DataLength remains within SMB boundary. We still
 642          * need to confirm that one CompressionAlgorithms member is accounted
 643          * for.
 644          */
 645         if (len < 10) {
 646                 pr_warn_once("server sent bad compression cntxt\n");
 647                 return;
 648         }
 649         if (le16_to_cpu(ctxt->CompressionAlgorithmCount) != 1) {
 650                 pr_warn_once("Invalid SMB3 compress algorithm count\n");
 651                 return;
 652         }
 653         if (le16_to_cpu(ctxt->CompressionAlgorithms[0]) > 3) {
 654                 pr_warn_once("unknown compression algorithm\n");
 655                 return;
 656         }
 657         server->compress_algorithm = ctxt->CompressionAlgorithms[0];
 658 }
 659
 660 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 661                               struct smb2_encryption_neg_context *ctxt)
 662 {
 663         unsigned int len = le16_to_cpu(ctxt->DataLength);
 664
 665         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 666         /*
 667          * Caller checked that DataLength remains within SMB boundary. We still
 668          * need to confirm that one Cipher flexible array member is accounted
 669          * for.
 670          */
 671         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 672                 pr_warn_once("server sent bad crypto ctxt len\n");
 673                 return -EINVAL;
 674         }
 675
 676         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 677                 pr_warn_once("Invalid SMB3.11 cipher count\n");
 678                 return -EINVAL;
 679         }
 680         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 681         if (require_gcm_256) {
 682                 if (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM) {
 683                         cifs_dbg(VFS, "Server does not support requested encryption type (AES256 GCM)\n");
 684                         return -EOPNOTSUPP;
 685                 }
 686         } else if (ctxt->Ciphers[0] == 0) {
 687                 /*
 688                  * e.g. if server only supported AES256_CCM (very unlikely)
 689                  * or server supported no encryption types or had all disabled.
 690                  * Since GLOBAL_CAP_ENCRYPTION will be not set, in the case
 691                  * in which mount requested encryption ("seal") checks later
 692                  * on during tree connection will return proper rc, but if
 693                  * seal not requested by client, since server is allowed to
 694                  * return 0 to indicate no supported cipher, we can't fail here
 695                  */
 696                 server->cipher_type = 0;
 697                 server->capabilities &= ~SMB2_GLOBAL_CAP_ENCRYPTION;
 698                 pr_warn_once("Server does not support requested encryption types\n");
 699                 return 0;
 700         } else if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 701                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM) &&
 702                    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES256_GCM)) {
 703                 /* server returned a cipher we didn't ask for */
 704                 pr_warn_once("Invalid SMB3.11 cipher returned\n");
 705                 return -EINVAL;
 706         }
 707         server->cipher_type = ctxt->Ciphers[0];
 708         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 709         return 0;
 710 }
 711
 712 static void decode_signing_ctx(struct TCP_Server_Info *server,
 713                                struct smb2_signing_capabilities *pctxt)
 714 {
 715         unsigned int len = le16_to_cpu(pctxt->DataLength);
 716
 717         /*
 718          * Caller checked that DataLength remains within SMB boundary. We still
 719          * need to confirm that one SigningAlgorithms flexible array member is
 720          * accounted for.
 721          */
 722         if ((len < 4) || (len > 16)) {
 723                 pr_warn_once("server sent bad signing negcontext\n");
 724                 return;
 725         }
 726         if (le16_to_cpu(pctxt->SigningAlgorithmCount) != 1) {
 727                 pr_warn_once("Invalid signing algorithm count\n");
 728                 return;
 729         }
 730         if (le16_to_cpu(pctxt->SigningAlgorithms[0]) > 2) {
 731                 pr_warn_once("unknown signing algorithm\n");
 732                 return;
 733         }
 734
 735         server->signing_negotiated = true;
 736         server->signing_algorithm = le16_to_cpu(pctxt->SigningAlgorithms[0]);
 737         cifs_dbg(FYI, "signing algorithm %d chosen\n",
 738                      server->signing_algorithm);
 739 }
 740
 741
 742 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 743                                      struct TCP_Server_Info *server,
 744                                      unsigned int len_of_smb)
 745 {
 746         struct smb2_neg_context *pctx;
 747         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 748         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 749         unsigned int len_of_ctxts, i;
 750         int rc = 0;
 751
 752         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 753         if (len_of_smb <= offset) {
 754                 cifs_server_dbg(VFS, "Invalid response: negotiate context offset\n");
 755                 return -EINVAL;
 756         }
 757
 758         len_of_ctxts = len_of_smb - offset;
 759
 760         for (i = 0; i < ctxt_cnt; i++) {
 761                 int clen;
 762                 /* check that offset is not beyond end of SMB */
 763                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 764                         break;
 765
 766                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 767                 clen = sizeof(struct smb2_neg_context)
 768                         + le16_to_cpu(pctx->DataLength);
 769                 /*
 770                  * 2.2.4 SMB2 NEGOTIATE Response
 771                  * Subsequent negotiate contexts MUST appear at the first 8-byte
 772                  * aligned offset following the previous negotiate context.
 773                  */
 774                 if (i + 1 != ctxt_cnt)
 775                         clen = ALIGN(clen, 8);
 776                 if (clen > len_of_ctxts)
 777                         break;
 778
 779                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 780                         decode_preauth_context(
 781                                 (struct smb2_preauth_neg_context *)pctx);
 782                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 783                         rc = decode_encrypt_ctx(server,
 784                                 (struct smb2_encryption_neg_context *)pctx);
 785                 else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES)
 786                         decode_compress_ctx(server,
 787                                 (struct smb2_compression_capabilities_context *)pctx);
 788                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 789                         server->posix_ext_supported = true;
 790                 else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES)
 791                         decode_signing_ctx(server,
 792                                 (struct smb2_signing_capabilities *)pctx);
 793                 else
 794                         cifs_server_dbg(VFS, "unknown negcontext of type %d ignored\n",
 795                                 le16_to_cpu(pctx->ContextType));
 796                 if (rc)
 797                         break;
 798
 799                 offset += clen;
 800                 len_of_ctxts -= clen;
 801         }
 802         return rc;
 803 }
 804
 805 static struct create_posix *
 806 create_posix_buf(umode_t mode)
 807 {
 808         struct create_posix *buf;
 809
 810         buf = kzalloc(sizeof(struct create_posix),
 811                         GFP_KERNEL);
 812         if (!buf)
 813                 return NULL;
 814
 815         buf->ccontext.DataOffset =
 816                 cpu_to_le16(offsetof(struct create_posix, Mode));
 817         buf->ccontext.DataLength = cpu_to_le32(4);
 818         buf->ccontext.NameOffset =
 819                 cpu_to_le16(offsetof(struct create_posix, Name));
 820         buf->ccontext.NameLength = cpu_to_le16(16);
 821
 822         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 823         buf->Name[0] = 0x93;
 824         buf->Name[1] = 0xAD;
 825         buf->Name[2] = 0x25;
 826         buf->Name[3] = 0x50;
 827         buf->Name[4] = 0x9C;
 828         buf->Name[5] = 0xB4;
 829         buf->Name[6] = 0x11;
 830         buf->Name[7] = 0xE7;
 831         buf->Name[8] = 0xB4;
 832         buf->Name[9] = 0x23;
 833         buf->Name[10] = 0x83;
 834         buf->Name[11] = 0xDE;
 835         buf->Name[12] = 0x96;
 836         buf->Name[13] = 0x8B;
 837         buf->Name[14] = 0xCD;
 838         buf->Name[15] = 0x7C;
 839         buf->Mode = cpu_to_le32(mode);
 840         cifs_dbg(FYI, "mode on posix create 0%o\n", mode);
 841         return buf;
 842 }
 843
 844 static int
 845 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 846 {
 847         unsigned int num = *num_iovec;
 848
 849         iov[num].iov_base = create_posix_buf(mode);
 850         if (mode == ACL_NO_MODE)
 851                 cifs_dbg(FYI, "%s: no mode\n", __func__);
 852         if (iov[num].iov_base == NULL)
 853                 return -ENOMEM;
 854         iov[num].iov_len = sizeof(struct create_posix);
 855         *num_iovec = num + 1;
 856         return 0;
 857 }
 858
 859
 860 /*
 861  *
 862  *      SMB2 Worker functions follow:
 863  *
 864  *      The general structure of the worker functions is:
 865  *      1) Call smb2_init (assembles SMB2 header)
 866  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 867  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 868  *      4) Decode SMB2 command specific fields in the fixed length area
 869  *      5) Decode variable length data area (if any for this SMB2 command type)
 870  *      6) Call free smb buffer
 871  *      7) return
 872  *
 873  */
 874
 875 int
 876 SMB2_negotiate(const unsigned int xid,
 877                struct cifs_ses *ses,
 878                struct TCP_Server_Info *server)
 879 {
 880         struct smb_rqst rqst;
 881         struct smb2_negotiate_req *req;
 882         struct smb2_negotiate_rsp *rsp;
 883         struct kvec iov[1];
 884         struct kvec rsp_iov;
 885         int rc;
 886         int resp_buftype;
 887         int blob_offset, blob_length;
 888         char *security_blob;
 889         int flags = CIFS_NEG_OP;
 890         unsigned int total_len;
 891
 892         cifs_dbg(FYI, "Negotiate protocol\n");
 893
 894         if (!server) {
 895                 WARN(1, "%s: server is NULL!\n", __func__);
 896                 return -EIO;
 897         }
 898
 899         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, server,
 900                                  (void **) &req, &total_len);
 901         if (rc)
 902                 return rc;
 903
 904         req->hdr.SessionId = 0;
 905
 906         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 907         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 908
 909         if (strcmp(server->vals->version_string,
 910                    SMB3ANY_VERSION_STRING) == 0) {
 911                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 912                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 913                 req->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
 914                 req->DialectCount = cpu_to_le16(3);
 915                 total_len += 6;
 916         } else if (strcmp(server->vals->version_string,
 917                    SMBDEFAULT_VERSION_STRING) == 0) {
 918                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 919                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 920                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 921                 req->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
 922                 req->DialectCount = cpu_to_le16(4);
 923                 total_len += 8;
 924         } else {
 925                 /* otherwise send specific dialect */
 926                 req->Dialects[0] = cpu_to_le16(server->vals->protocol_id);
 927                 req->DialectCount = cpu_to_le16(1);
 928                 total_len += 2;
 929         }
 930
 931         /* only one of SMB2 signing flags may be set in SMB2 request */
 932         if (ses->sign)
 933                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 934         else if (global_secflags & CIFSSEC_MAY_SIGN)
 935                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 936         else
 937                 req->SecurityMode = 0;
 938
 939         req->Capabilities = cpu_to_le32(server->vals->req_capabilities);
 940         if (ses->chan_max > 1)
 941                 req->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
 942
 943         /* ClientGUID must be zero for SMB2.02 dialect */
 944         if (server->vals->protocol_id == SMB20_PROT_ID)
 945                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 946         else {
 947                 memcpy(req->ClientGUID, server->client_guid,
 948                         SMB2_CLIENT_GUID_SIZE);
 949                 if ((server->vals->protocol_id == SMB311_PROT_ID) ||
 950                     (strcmp(server->vals->version_string,
 951                      SMB3ANY_VERSION_STRING) == 0) ||
 952                     (strcmp(server->vals->version_string,
 953                      SMBDEFAULT_VERSION_STRING) == 0))
 954                         assemble_neg_contexts(req, server, &total_len);
 955         }
 956         iov[0].iov_base = (char *)req;
 957         iov[0].iov_len = total_len;
 958
 959         memset(&rqst, 0, sizeof(struct smb_rqst));
 960         rqst.rq_iov = iov;
 961         rqst.rq_nvec = 1;
 962
 963         rc = cifs_send_recv(xid, ses, server,
 964                             &rqst, &resp_buftype, flags, &rsp_iov);
 965         cifs_small_buf_release(req);
 966         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 967         /*
 968          * No tcon so can't do
 969          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 970          */
 971         if (rc == -EOPNOTSUPP) {
 972                 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");
 973                 goto neg_exit;
 974         } else if (rc != 0)
 975                 goto neg_exit;
 976
 977         rc = -EIO;
 978         if (strcmp(server->vals->version_string,
 979                    SMB3ANY_VERSION_STRING) == 0) {
 980                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 981                         cifs_server_dbg(VFS,
 982                                 "SMB2 dialect returned but not requested\n");
 983                         goto neg_exit;
 984                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 985                         cifs_server_dbg(VFS,
 986                                 "SMB2.1 dialect returned but not requested\n");
 987                         goto neg_exit;
 988                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 989                         /* ops set to 3.0 by default for default so update */
 990                         server->ops = &smb311_operations;
 991                         server->vals = &smb311_values;
 992                 }
 993         } else if (strcmp(server->vals->version_string,
 994                    SMBDEFAULT_VERSION_STRING) == 0) {
 995                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 996                         cifs_server_dbg(VFS,
 997                                 "SMB2 dialect returned but not requested\n");
 998                         goto neg_exit;
 999                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
1000                         /* ops set to 3.0 by default for default so update */
1001                         server->ops = &smb21_operations;
1002                         server->vals = &smb21_values;
1003                 } else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1004                         server->ops = &smb311_operations;
1005                         server->vals = &smb311_values;
1006                 }
1007         } else if (le16_to_cpu(rsp->DialectRevision) !=
1008                                 server->vals->protocol_id) {
1009                 /* if requested single dialect ensure returned dialect matched */
1010                 cifs_server_dbg(VFS, "Invalid 0x%x dialect returned: not requested\n",
1011                                 le16_to_cpu(rsp->DialectRevision));
1012                 goto neg_exit;
1013         }
1014
1015         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
1016
1017         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
1018                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
1019         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
1020                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
1021         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
1022                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
1023         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
1024                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
1025         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
1026                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
1027         else {
1028                 cifs_server_dbg(VFS, "Invalid dialect returned by server 0x%x\n",
1029                                 le16_to_cpu(rsp->DialectRevision));
1030                 goto neg_exit;
1031         }
1032
1033         rc = 0;
1034         server->dialect = le16_to_cpu(rsp->DialectRevision);
1035
1036         /*
1037          * Keep a copy of the hash after negprot. This hash will be
1038          * the starting hash value for all sessions made from this
1039          * server.
1040          */
1041         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
1042                SMB2_PREAUTH_HASH_SIZE);
1043
1044         /* SMB2 only has an extended negflavor */
1045         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
1046         /* set it to the maximum buffer size value we can send with 1 credit */
1047         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
1048                                SMB2_MAX_BUFFER_SIZE);
1049         server->max_read = le32_to_cpu(rsp->MaxReadSize);
1050         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
1051         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
1052         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
1053                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
1054                                 server->sec_mode);
1055         server->capabilities = le32_to_cpu(rsp->Capabilities);
1056         /* Internal types */
1057         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
1058
1059         /*
1060          * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context
1061          * Set the cipher type manually.
1062          */
1063         if (server->dialect == SMB30_PROT_ID && (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1064                 server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
1065
1066         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
1067                                                (struct smb2_hdr *)rsp);
1068         /*
1069          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
1070          * for us will be
1071          *      ses->sectype = RawNTLMSSP;
1072          * but for time being this is our only auth choice so doesn't matter.
1073          * We just found a server which sets blob length to zero expecting raw.
1074          */
1075         if (blob_length == 0) {
1076                 cifs_dbg(FYI, "missing security blob on negprot\n");
1077                 server->sec_ntlmssp = true;
1078         }
1079
1080         rc = cifs_enable_signing(server, ses->sign);
1081         if (rc)
1082                 goto neg_exit;
1083         if (blob_length) {
1084                 rc = decode_negTokenInit(security_blob, blob_length, server);
1085                 if (rc == 1)
1086                         rc = 0;
1087                 else if (rc == 0)
1088                         rc = -EIO;
1089         }
1090
1091         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
1092                 if (rsp->NegotiateContextCount)
1093                         rc = smb311_decode_neg_context(rsp, server,
1094                                                        rsp_iov.iov_len);
1095                 else
1096                         cifs_server_dbg(VFS, "Missing expected negotiate contexts\n");
1097         }
1098 neg_exit:
1099         free_rsp_buf(resp_buftype, rsp);
1100         return rc;
1101 }
1102
1103 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
1104 {
1105         int rc;
1106         struct validate_negotiate_info_req *pneg_inbuf;
1107         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
1108         u32 rsplen;
1109         u32 inbuflen; /* max of 4 dialects */
1110         struct TCP_Server_Info *server = tcon->ses->server;
1111
1112         cifs_dbg(FYI, "validate negotiate\n");
1113
1114         /* In SMB3.11 preauth integrity supersedes validate negotiate */
1115         if (server->dialect == SMB311_PROT_ID)
1116                 return 0;
1117
1118         /*
1119          * validation ioctl must be signed, so no point sending this if we
1120          * can not sign it (ie are not known user).  Even if signing is not
1121          * required (enabled but not negotiated), in those cases we selectively
1122          * sign just this, the first and only signed request on a connection.
1123          * Having validation of negotiate info  helps reduce attack vectors.
1124          */
1125         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
1126                 return 0; /* validation requires signing */
1127
1128         if (tcon->ses->user_name == NULL) {
1129                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
1130                 return 0; /* validation requires signing */
1131         }
1132
1133         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
1134                 cifs_tcon_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
1135
1136         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
1137         if (!pneg_inbuf)
1138                 return -ENOMEM;
1139
1140         pneg_inbuf->Capabilities =
1141                         cpu_to_le32(server->vals->req_capabilities);
1142         if (tcon->ses->chan_max > 1)
1143                 pneg_inbuf->Capabilities |= cpu_to_le32(SMB2_GLOBAL_CAP_MULTI_CHANNEL);
1144
1145         memcpy(pneg_inbuf->Guid, server->client_guid,
1146                                         SMB2_CLIENT_GUID_SIZE);
1147
1148         if (tcon->ses->sign)
1149                 pneg_inbuf->SecurityMode =
1150                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
1151         else if (global_secflags & CIFSSEC_MAY_SIGN)
1152                 pneg_inbuf->SecurityMode =
1153                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
1154         else
1155                 pneg_inbuf->SecurityMode = 0;
1156
1157
1158         if (strcmp(server->vals->version_string,
1159                 SMB3ANY_VERSION_STRING) == 0) {
1160                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
1161                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
1162                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB311_PROT_ID);
1163                 pneg_inbuf->DialectCount = cpu_to_le16(3);
1164                 /* SMB 2.1 not included so subtract one dialect from len */
1165                 inbuflen = sizeof(*pneg_inbuf) -
1166                                 (sizeof(pneg_inbuf->Dialects[0]));
1167         } else if (strcmp(server->vals->version_string,
1168                 SMBDEFAULT_VERSION_STRING) == 0) {
1169                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
1170                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
1171                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
1172                 pneg_inbuf->Dialects[3] = cpu_to_le16(SMB311_PROT_ID);
1173                 pneg_inbuf->DialectCount = cpu_to_le16(4);
1174                 /* structure is big enough for 4 dialects */
1175                 inbuflen = sizeof(*pneg_inbuf);
1176         } else {
1177                 /* otherwise specific dialect was requested */
1178                 pneg_inbuf->Dialects[0] =
1179                         cpu_to_le16(server->vals->protocol_id);
1180                 pneg_inbuf->DialectCount = cpu_to_le16(1);
1181                 /* structure is big enough for 4 dialects, sending only 1 */
1182                 inbuflen = sizeof(*pneg_inbuf) -
1183                                 sizeof(pneg_inbuf->Dialects[0]) * 3;
1184         }
1185
1186         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
1187                 FSCTL_VALIDATE_NEGOTIATE_INFO,
1188                 (char *)pneg_inbuf, inbuflen, CIFSMaxBufSize,
1189                 (char **)&pneg_rsp, &rsplen);
1190         if (rc == -EOPNOTSUPP) {
1191                 /*
1192                  * Old Windows versions or Netapp SMB server can return
1193                  * not supported error. Client should accept it.
1194                  */
1195                 cifs_tcon_dbg(VFS, "Server does not support validate negotiate\n");
1196                 rc = 0;
1197                 goto out_free_inbuf;
1198         } else if (rc != 0) {
1199                 cifs_tcon_dbg(VFS, "validate protocol negotiate failed: %d\n",
1200                               rc);
1201                 rc = -EIO;
1202                 goto out_free_inbuf;
1203         }
1204
1205         rc = -EIO;
1206         if (rsplen != sizeof(*pneg_rsp)) {
1207                 cifs_tcon_dbg(VFS, "Invalid protocol negotiate response size: %d\n",
1208                               rsplen);
1209
1210                 /* relax check since Mac returns max bufsize allowed on ioctl */
1211                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
1212                         goto out_free_rsp;
1213         }
1214
1215         /* check validate negotiate info response matches what we got earlier */
1216         if (pneg_rsp->Dialect != cpu_to_le16(server->dialect))
1217                 goto vneg_out;
1218
1219         if (pneg_rsp->SecurityMode != cpu_to_le16(server->sec_mode))
1220                 goto vneg_out;
1221
1222         /* do not validate server guid because not saved at negprot time yet */
1223
1224         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
1225               SMB2_LARGE_FILES) != server->capabilities)
1226                 goto vneg_out;
1227
1228         /* validate negotiate successful */
1229         rc = 0;
1230         cifs_dbg(FYI, "validate negotiate info successful\n");
1231         goto out_free_rsp;
1232
1233 vneg_out:
1234         cifs_tcon_dbg(VFS, "protocol revalidation - security settings mismatch\n");
1235 out_free_rsp:
1236         kfree(pneg_rsp);
1237 out_free_inbuf:
1238         kfree(pneg_inbuf);
1239         return rc;
1240 }
1241
1242 enum securityEnum
1243 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
1244 {
1245         switch (requested) {
1246         case Kerberos:
1247         case RawNTLMSSP:
1248                 return requested;
1249         case NTLMv2:
1250                 return RawNTLMSSP;
1251         case Unspecified:
1252                 if (server->sec_ntlmssp &&
1253                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
1254                         return RawNTLMSSP;
1255                 if ((server->sec_kerberos || server->sec_mskerberos) &&
1256                         (global_secflags & CIFSSEC_MAY_KRB5))
1257                         return Kerberos;
1258                 fallthrough;
1259         default:
1260                 return Unspecified;
1261         }
1262 }
1263
1264 struct SMB2_sess_data {
1265         unsigned int xid;
1266         struct cifs_ses *ses;
1267         struct TCP_Server_Info *server;
1268         struct nls_table *nls_cp;
1269         void (*func)(struct SMB2_sess_data *);
1270         int result;
1271         u64 previous_session;
1272
1273         /* we will send the SMB in three pieces:
1274          * a fixed length beginning part, an optional
1275          * SPNEGO blob (which can be zero length), and a
1276          * last part which will include the strings
1277          * and rest of bcc area. This allows us to avoid
1278          * a large buffer 17K allocation
1279          */
1280         int buf0_type;
1281         struct kvec iov[2];
1282 };
1283
1284 static int
1285 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1286 {
1287         int rc;
1288         struct cifs_ses *ses = sess_data->ses;
1289         struct TCP_Server_Info *server = sess_data->server;
1290         struct smb2_sess_setup_req *req;
1291         unsigned int total_len;
1292         bool is_binding = false;
1293
1294         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, server,
1295                                  (void **) &req,
1296                                  &total_len);
1297         if (rc)
1298                 return rc;
1299
1300         spin_lock(&ses->ses_lock);
1301         is_binding = (ses->ses_status == SES_GOOD);
1302         spin_unlock(&ses->ses_lock);
1303
1304         if (is_binding) {
1305                 req->hdr.SessionId = cpu_to_le64(ses->Suid);
1306                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1307                 req->PreviousSessionId = 0;
1308                 req->Flags = SMB2_SESSION_REQ_FLAG_BINDING;
1309                 cifs_dbg(FYI, "Binding to sess id: %llx\n", ses->Suid);
1310         } else {
1311                 /* First session, not a reauthenticate */
1312                 req->hdr.SessionId = 0;
1313                 /*
1314                  * if reconnect, we need to send previous sess id
1315                  * otherwise it is 0
1316                  */
1317                 req->PreviousSessionId = cpu_to_le64(sess_data->previous_session);
1318                 req->Flags = 0; /* MBZ */
1319                 cifs_dbg(FYI, "Fresh session. Previous: %llx\n",
1320                          sess_data->previous_session);
1321         }
1322
1323         /* enough to enable echos and oplocks and one max size write */
1324         if (server->credits >= server->max_credits)
1325                 req->hdr.CreditRequest = cpu_to_le16(0);
1326         else
1327                 req->hdr.CreditRequest = cpu_to_le16(
1328                         min_t(int, server->max_credits -
1329                               server->credits, 130));
1330
1331         /* only one of SMB2 signing flags may be set in SMB2 request */
1332         if (server->sign)
1333                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1334         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1335                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1336         else
1337                 req->SecurityMode = 0;
1338
1339 #ifdef CONFIG_CIFS_DFS_UPCALL
1340         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1341 #else
1342         req->Capabilities = 0;
1343 #endif /* DFS_UPCALL */
1344
1345         req->Channel = 0; /* MBZ */
1346
1347         sess_data->iov[0].iov_base = (char *)req;
1348         /* 1 for pad */
1349         sess_data->iov[0].iov_len = total_len - 1;
1350         /*
1351          * This variable will be used to clear the buffer
1352          * allocated above in case of any error in the calling function.
1353          */
1354         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1355
1356         return 0;
1357 }
1358
1359 static void
1360 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1361 {
1362         struct kvec *iov = sess_data->iov;
1363
1364         /* iov[1] is already freed by caller */
1365         if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
1366                 memzero_explicit(iov[0].iov_base, iov[0].iov_len);
1367
1368         free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
1369         sess_data->buf0_type = CIFS_NO_BUFFER;
1370 }
1371
1372 static int
1373 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1374 {
1375         int rc;
1376         struct smb_rqst rqst;
1377         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1378         struct kvec rsp_iov = { NULL, 0 };
1379
1380         /* Testing shows that buffer offset must be at location of Buffer[0] */
1381         req->SecurityBufferOffset =
1382                 cpu_to_le16(sizeof(struct smb2_sess_setup_req));
1383         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1384
1385         memset(&rqst, 0, sizeof(struct smb_rqst));
1386         rqst.rq_iov = sess_data->iov;
1387         rqst.rq_nvec = 2;
1388
1389         /* BB add code to build os and lm fields */
1390         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1391                             sess_data->server,
1392                             &rqst,
1393                             &sess_data->buf0_type,
1394                             CIFS_LOG_ERROR | CIFS_SESS_OP, &rsp_iov);
1395         cifs_small_buf_release(sess_data->iov[0].iov_base);
1396         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1397
1398         return rc;
1399 }
1400
1401 static int
1402 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1403 {
1404         int rc = 0;
1405         struct cifs_ses *ses = sess_data->ses;
1406         struct TCP_Server_Info *server = sess_data->server;
1407
1408         cifs_server_lock(server);
1409         if (server->ops->generate_signingkey) {
1410                 rc = server->ops->generate_signingkey(ses, server);
1411                 if (rc) {
1412                         cifs_dbg(FYI,
1413                                 "SMB3 session key generation failed\n");
1414                         cifs_server_unlock(server);
1415                         return rc;
1416                 }
1417         }
1418         if (!server->session_estab) {
1419                 server->sequence_number = 0x2;
1420                 server->session_estab = true;
1421         }
1422         cifs_server_unlock(server);
1423
1424         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1425         return rc;
1426 }
1427
1428 #ifdef CONFIG_CIFS_UPCALL
1429 static void
1430 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1431 {
1432         int rc;
1433         struct cifs_ses *ses = sess_data->ses;
1434         struct TCP_Server_Info *server = sess_data->server;
1435         struct cifs_spnego_msg *msg;
1436         struct key *spnego_key = NULL;
1437         struct smb2_sess_setup_rsp *rsp = NULL;
1438         bool is_binding = false;
1439
1440         rc = SMB2_sess_alloc_buffer(sess_data);
1441         if (rc)
1442                 goto out;
1443
1444         spnego_key = cifs_get_spnego_key(ses, server);
1445         if (IS_ERR(spnego_key)) {
1446                 rc = PTR_ERR(spnego_key);
1447                 if (rc == -ENOKEY)
1448                         cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1449                 spnego_key = NULL;
1450                 goto out;
1451         }
1452
1453         msg = spnego_key->payload.data[0];
1454         /*
1455          * check version field to make sure that cifs.upcall is
1456          * sending us a response in an expected form
1457          */
1458         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1459                 cifs_dbg(VFS, "bad cifs.upcall version. Expected %d got %d\n",
1460                          CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1461                 rc = -EKEYREJECTED;
1462                 goto out_put_spnego_key;
1463         }
1464
1465         spin_lock(&ses->ses_lock);
1466         is_binding = (ses->ses_status == SES_GOOD);
1467         spin_unlock(&ses->ses_lock);
1468
1469         /* keep session key if binding */
1470         if (!is_binding) {
1471                 kfree_sensitive(ses->auth_key.response);
1472                 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1473                                                  GFP_KERNEL);
1474                 if (!ses->auth_key.response) {
1475                         cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
1476                                  msg->sesskey_len);
1477                         rc = -ENOMEM;
1478                         goto out_put_spnego_key;
1479                 }
1480                 ses->auth_key.len = msg->sesskey_len;
1481         }
1482
1483         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1484         sess_data->iov[1].iov_len = msg->secblob_len;
1485
1486         rc = SMB2_sess_sendreceive(sess_data);
1487         if (rc)
1488                 goto out_put_spnego_key;
1489
1490         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1491         /* keep session id and flags if binding */
1492         if (!is_binding) {
1493                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1494                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1495         }
1496
1497         rc = SMB2_sess_establish_session(sess_data);
1498 out_put_spnego_key:
1499         key_invalidate(spnego_key);
1500         key_put(spnego_key);
1501         if (rc) {
1502                 kfree_sensitive(ses->auth_key.response);
1503                 ses->auth_key.response = NULL;
1504                 ses->auth_key.len = 0;
1505         }
1506 out:
1507         sess_data->result = rc;
1508         sess_data->func = NULL;
1509         SMB2_sess_free_buffer(sess_data);
1510 }
1511 #else
1512 static void
1513 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1514 {
1515         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1516         sess_data->result = -EOPNOTSUPP;
1517         sess_data->func = NULL;
1518 }
1519 #endif
1520
1521 static void
1522 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1523
1524 static void
1525 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1526 {
1527         int rc;
1528         struct cifs_ses *ses = sess_data->ses;
1529         struct TCP_Server_Info *server = sess_data->server;
1530         struct smb2_sess_setup_rsp *rsp = NULL;
1531         unsigned char *ntlmssp_blob = NULL;
1532         bool use_spnego = false; /* else use raw ntlmssp */
1533         u16 blob_length = 0;
1534         bool is_binding = false;
1535
1536         /*
1537          * If memory allocation is successful, caller of this function
1538          * frees it.
1539          */
1540         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1541         if (!ses->ntlmssp) {
1542                 rc = -ENOMEM;
1543                 goto out_err;
1544         }
1545         ses->ntlmssp->sesskey_per_smbsess = true;
1546
1547         rc = SMB2_sess_alloc_buffer(sess_data);
1548         if (rc)
1549                 goto out_err;
1550
1551         rc = build_ntlmssp_smb3_negotiate_blob(&ntlmssp_blob,
1552                                           &blob_length, ses, server,
1553                                           sess_data->nls_cp);
1554         if (rc)
1555                 goto out;
1556
1557         if (use_spnego) {
1558                 /* BB eventually need to add this */
1559                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1560                 rc = -EOPNOTSUPP;
1561                 goto out;
1562         }
1563         sess_data->iov[1].iov_base = ntlmssp_blob;
1564         sess_data->iov[1].iov_len = blob_length;
1565
1566         rc = SMB2_sess_sendreceive(sess_data);
1567         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1568
1569         /* If true, rc here is expected and not an error */
1570         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1571                 rsp->hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1572                 rc = 0;
1573
1574         if (rc)
1575                 goto out;
1576
1577         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1578                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1579                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1580                         le16_to_cpu(rsp->SecurityBufferOffset));
1581                 rc = -EIO;
1582                 goto out;
1583         }
1584         rc = decode_ntlmssp_challenge(rsp->Buffer,
1585                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1586         if (rc)
1587                 goto out;
1588
1589         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1590
1591         spin_lock(&ses->ses_lock);
1592         is_binding = (ses->ses_status == SES_GOOD);
1593         spin_unlock(&ses->ses_lock);
1594
1595         /* keep existing ses id and flags if binding */
1596         if (!is_binding) {
1597                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1598                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1599         }
1600
1601 out:
1602         kfree_sensitive(ntlmssp_blob);
1603         SMB2_sess_free_buffer(sess_data);
1604         if (!rc) {
1605                 sess_data->result = 0;
1606                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1607                 return;
1608         }
1609 out_err:
1610         kfree_sensitive(ses->ntlmssp);
1611         ses->ntlmssp = NULL;
1612         sess_data->result = rc;
1613         sess_data->func = NULL;
1614 }
1615
1616 static void
1617 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1618 {
1619         int rc;
1620         struct cifs_ses *ses = sess_data->ses;
1621         struct TCP_Server_Info *server = sess_data->server;
1622         struct smb2_sess_setup_req *req;
1623         struct smb2_sess_setup_rsp *rsp = NULL;
1624         unsigned char *ntlmssp_blob = NULL;
1625         bool use_spnego = false; /* else use raw ntlmssp */
1626         u16 blob_length = 0;
1627         bool is_binding = false;
1628
1629         rc = SMB2_sess_alloc_buffer(sess_data);
1630         if (rc)
1631                 goto out;
1632
1633         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1634         req->hdr.SessionId = cpu_to_le64(ses->Suid);
1635
1636         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length,
1637                                      ses, server,
1638                                      sess_data->nls_cp);
1639         if (rc) {
1640                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1641                 goto out;
1642         }
1643
1644         if (use_spnego) {
1645                 /* BB eventually need to add this */
1646                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1647                 rc = -EOPNOTSUPP;
1648                 goto out;
1649         }
1650         sess_data->iov[1].iov_base = ntlmssp_blob;
1651         sess_data->iov[1].iov_len = blob_length;
1652
1653         rc = SMB2_sess_sendreceive(sess_data);
1654         if (rc)
1655                 goto out;
1656
1657         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1658
1659         spin_lock(&ses->ses_lock);
1660         is_binding = (ses->ses_status == SES_GOOD);
1661         spin_unlock(&ses->ses_lock);
1662
1663         /* keep existing ses id and flags if binding */
1664         if (!is_binding) {
1665                 ses->Suid = le64_to_cpu(rsp->hdr.SessionId);
1666                 ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1667         }
1668
1669         rc = SMB2_sess_establish_session(sess_data);
1670 #ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
1671         if (ses->server->dialect < SMB30_PROT_ID) {
1672                 cifs_dbg(VFS, "%s: dumping generated SMB2 session keys\n", __func__);
1673                 /*
1674                  * The session id is opaque in terms of endianness, so we can't
1675                  * print it as a long long. we dump it as we got it on the wire
1676                  */
1677                 cifs_dbg(VFS, "Session Id    %*ph\n", (int)sizeof(ses->Suid),
1678                          &ses->Suid);
1679                 cifs_dbg(VFS, "Session Key   %*ph\n",
1680                          SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
1681                 cifs_dbg(VFS, "Signing Key   %*ph\n",
1682                          SMB3_SIGN_KEY_SIZE, ses->auth_key.response);
1683         }
1684 #endif
1685 out:
1686         kfree_sensitive(ntlmssp_blob);
1687         SMB2_sess_free_buffer(sess_data);
1688         kfree_sensitive(ses->ntlmssp);
1689         ses->ntlmssp = NULL;
1690         sess_data->result = rc;
1691         sess_data->func = NULL;
1692 }
1693
1694 static int
1695 SMB2_select_sec(struct SMB2_sess_data *sess_data)
1696 {
1697         int type;
1698         struct cifs_ses *ses = sess_data->ses;
1699         struct TCP_Server_Info *server = sess_data->server;
1700
1701         type = smb2_select_sectype(server, ses->sectype);
1702         cifs_dbg(FYI, "sess setup type %d\n", type);
1703         if (type == Unspecified) {
1704                 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
1705                 return -EINVAL;
1706         }
1707
1708         switch (type) {
1709         case Kerberos:
1710                 sess_data->func = SMB2_auth_kerberos;
1711                 break;
1712         case RawNTLMSSP:
1713                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1714                 break;
1715         default:
1716                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1717                 return -EOPNOTSUPP;
1718         }
1719
1720         return 0;
1721 }
1722
1723 int
1724 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1725                 struct TCP_Server_Info *server,
1726                 const struct nls_table *nls_cp)
1727 {
1728         int rc = 0;
1729         struct SMB2_sess_data *sess_data;
1730
1731         cifs_dbg(FYI, "Session Setup\n");
1732
1733         if (!server) {
1734                 WARN(1, "%s: server is NULL!\n", __func__);
1735                 return -EIO;
1736         }
1737
1738         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1739         if (!sess_data)
1740                 return -ENOMEM;
1741
1742         sess_data->xid = xid;
1743         sess_data->ses = ses;
1744         sess_data->server = server;
1745         sess_data->buf0_type = CIFS_NO_BUFFER;
1746         sess_data->nls_cp = (struct nls_table *) nls_cp;
1747         sess_data->previous_session = ses->Suid;
1748
1749         rc = SMB2_select_sec(sess_data);
1750         if (rc)
1751                 goto out;
1752
1753         /*
1754          * Initialize the session hash with the server one.
1755          */
1756         memcpy(ses->preauth_sha_hash, server->preauth_sha_hash,
1757                SMB2_PREAUTH_HASH_SIZE);
1758
1759         while (sess_data->func)
1760                 sess_data->func(sess_data);
1761
1762         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1763                 cifs_server_dbg(VFS, "signing requested but authenticated as guest\n");
1764         rc = sess_data->result;
1765 out:
1766         kfree_sensitive(sess_data);
1767         return rc;
1768 }
1769
1770 int
1771 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1772 {
1773         struct smb_rqst rqst;
1774         struct smb2_logoff_req *req; /* response is also trivial struct */
1775         int rc = 0;
1776         struct TCP_Server_Info *server;
1777         int flags = 0;
1778         unsigned int total_len;
1779         struct kvec iov[1];
1780         struct kvec rsp_iov;
1781         int resp_buf_type;
1782
1783         cifs_dbg(FYI, "disconnect session %p\n", ses);
1784
1785         if (ses && (ses->server))
1786                 server = ses->server;
1787         else
1788                 return -EIO;
1789
1790         /* no need to send SMB logoff if uid already closed due to reconnect */
1791         spin_lock(&ses->chan_lock);
1792         if (CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
1793                 spin_unlock(&ses->chan_lock);
1794                 goto smb2_session_already_dead;
1795         }
1796         spin_unlock(&ses->chan_lock);
1797
1798         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, ses->server,
1799                                  (void **) &req, &total_len);
1800         if (rc)
1801                 return rc;
1802
1803          /* since no tcon, smb2_init can not do this, so do here */
1804         req->hdr.SessionId = cpu_to_le64(ses->Suid);
1805
1806         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1807                 flags |= CIFS_TRANSFORM_REQ;
1808         else if (server->sign)
1809                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1810
1811         flags |= CIFS_NO_RSP_BUF;
1812
1813         iov[0].iov_base = (char *)req;
1814         iov[0].iov_len = total_len;
1815
1816         memset(&rqst, 0, sizeof(struct smb_rqst));
1817         rqst.rq_iov = iov;
1818         rqst.rq_nvec = 1;
1819
1820         rc = cifs_send_recv(xid, ses, ses->server,
1821                             &rqst, &resp_buf_type, flags, &rsp_iov);
1822         cifs_small_buf_release(req);
1823         /*
1824          * No tcon so can't do
1825          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1826          */
1827
1828 smb2_session_already_dead:
1829         return rc;
1830 }
1831
1832 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1833 {
1834         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1835 }
1836
1837 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1838
1839 /* These are similar values to what Windows uses */
1840 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1841 {
1842         tcon->max_chunks = 256;
1843         tcon->max_bytes_chunk = 1048576;
1844         tcon->max_bytes_copy = 16777216;
1845 }
1846
1847 int
1848 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1849           struct cifs_tcon *tcon, const struct nls_table *cp)
1850 {
1851         struct smb_rqst rqst;
1852         struct smb2_tree_connect_req *req;
1853         struct smb2_tree_connect_rsp *rsp = NULL;
1854         struct kvec iov[2];
1855         struct kvec rsp_iov = { NULL, 0 };
1856         int rc = 0;
1857         int resp_buftype;
1858         int unc_path_len;
1859         __le16 *unc_path = NULL;
1860         int flags = 0;
1861         unsigned int total_len;
1862         struct TCP_Server_Info *server;
1863
1864         /* always use master channel */
1865         server = ses->server;
1866
1867         cifs_dbg(FYI, "TCON\n");
1868
1869         if (!server || !tree)
1870                 return -EIO;
1871
1872         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1873         if (unc_path == NULL)
1874                 return -ENOMEM;
1875
1876         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp);
1877         if (unc_path_len <= 0) {
1878                 kfree(unc_path);
1879                 return -EINVAL;
1880         }
1881         unc_path_len *= 2;
1882
1883         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1884         tcon->tid = 0;
1885         atomic_set(&tcon->num_remote_opens, 0);
1886         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, server,
1887                                  (void **) &req, &total_len);
1888         if (rc) {
1889                 kfree(unc_path);
1890                 return rc;
1891         }
1892
1893         if (smb3_encryption_required(tcon))
1894                 flags |= CIFS_TRANSFORM_REQ;
1895
1896         iov[0].iov_base = (char *)req;
1897         /* 1 for pad */
1898         iov[0].iov_len = total_len - 1;
1899
1900         /* Testing shows that buffer offset must be at location of Buffer[0] */
1901         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req));
1902         req->PathLength = cpu_to_le16(unc_path_len);
1903         iov[1].iov_base = unc_path;
1904         iov[1].iov_len = unc_path_len;
1905
1906         /*
1907          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1908          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1909          * (Samba servers don't always set the flag so also check if null user)
1910          */
1911         if ((server->dialect == SMB311_PROT_ID) &&
1912             !smb3_encryption_required(tcon) &&
1913             !(ses->session_flags &
1914                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1915             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1916                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
1917
1918         memset(&rqst, 0, sizeof(struct smb_rqst));
1919         rqst.rq_iov = iov;
1920         rqst.rq_nvec = 2;
1921
1922         /* Need 64 for max size write so ask for more in case not there yet */
1923         if (server->credits >= server->max_credits)
1924                 req->hdr.CreditRequest = cpu_to_le16(0);
1925         else
1926                 req->hdr.CreditRequest = cpu_to_le16(
1927                         min_t(int, server->max_credits -
1928                               server->credits, 64));
1929
1930         rc = cifs_send_recv(xid, ses, server,
1931                             &rqst, &resp_buftype, flags, &rsp_iov);
1932         cifs_small_buf_release(req);
1933         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1934         trace_smb3_tcon(xid, tcon->tid, ses->Suid, tree, rc);
1935         if ((rc != 0) || (rsp == NULL)) {
1936                 cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1937                 tcon->need_reconnect = true;
1938                 goto tcon_error_exit;
1939         }
1940
1941         switch (rsp->ShareType) {
1942         case SMB2_SHARE_TYPE_DISK:
1943                 cifs_dbg(FYI, "connection to disk share\n");
1944                 break;
1945         case SMB2_SHARE_TYPE_PIPE:
1946                 tcon->pipe = true;
1947                 cifs_dbg(FYI, "connection to pipe share\n");
1948                 break;
1949         case SMB2_SHARE_TYPE_PRINT:
1950                 tcon->print = true;
1951                 cifs_dbg(FYI, "connection to printer\n");
1952                 break;
1953         default:
1954                 cifs_server_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1955                 rc = -EOPNOTSUPP;
1956                 goto tcon_error_exit;
1957         }
1958
1959         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1960         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1961         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1962         tcon->tid = le32_to_cpu(rsp->hdr.Id.SyncId.TreeId);
1963         strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));
1964
1965         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1966             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1967                 cifs_tcon_dbg(VFS, "DFS capability contradicts DFS flag\n");
1968
1969         if (tcon->seal &&
1970             !(server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1971                 cifs_tcon_dbg(VFS, "Encryption is requested but not supported\n");
1972
1973         init_copy_chunk_defaults(tcon);
1974         if (server->ops->validate_negotiate)
1975                 rc = server->ops->validate_negotiate(xid, tcon);
1976         if (rc == 0) /* See MS-SMB2 2.2.10 and 3.2.5.5 */
1977                 if (tcon->share_flags & SMB2_SHAREFLAG_ISOLATED_TRANSPORT)
1978                         server->nosharesock = true;
1979 tcon_exit:
1980
1981         free_rsp_buf(resp_buftype, rsp);
1982         kfree(unc_path);
1983         return rc;
1984
1985 tcon_error_exit:
1986         if (rsp && rsp->hdr.Status == STATUS_BAD_NETWORK_NAME)
1987                 cifs_tcon_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1988         goto tcon_exit;
1989 }
1990
1991 int
1992 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1993 {
1994         struct smb_rqst rqst;
1995         struct smb2_tree_disconnect_req *req; /* response is trivial */
1996         int rc = 0;
1997         struct cifs_ses *ses = tcon->ses;
1998         int flags = 0;
1999         unsigned int total_len;
2000         struct kvec iov[1];
2001         struct kvec rsp_iov;
2002         int resp_buf_type;
2003
2004         cifs_dbg(FYI, "Tree Disconnect\n");
2005
2006         if (!ses || !(ses->server))
2007                 return -EIO;
2008
2009         trace_smb3_tdis_enter(xid, tcon->tid, ses->Suid, tcon->tree_name);
2010         spin_lock(&ses->chan_lock);
2011         if ((tcon->need_reconnect) ||
2012             (CIFS_ALL_CHANS_NEED_RECONNECT(tcon->ses))) {
2013                 spin_unlock(&ses->chan_lock);
2014                 return 0;
2015         }
2016         spin_unlock(&ses->chan_lock);
2017
2018         invalidate_all_cached_dirs(tcon);
2019
2020         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, ses->server,
2021                                  (void **) &req,
2022                                  &total_len);
2023         if (rc)
2024                 return rc;
2025
2026         if (smb3_encryption_required(tcon))
2027                 flags |= CIFS_TRANSFORM_REQ;
2028
2029         flags |= CIFS_NO_RSP_BUF;
2030
2031         iov[0].iov_base = (char *)req;
2032         iov[0].iov_len = total_len;
2033
2034         memset(&rqst, 0, sizeof(struct smb_rqst));
2035         rqst.rq_iov = iov;
2036         rqst.rq_nvec = 1;
2037
2038         rc = cifs_send_recv(xid, ses, ses->server,
2039                             &rqst, &resp_buf_type, flags, &rsp_iov);
2040         cifs_small_buf_release(req);
2041         if (rc) {
2042                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
2043                 trace_smb3_tdis_err(xid, tcon->tid, ses->Suid, rc);
2044         }
2045         trace_smb3_tdis_done(xid, tcon->tid, ses->Suid);
2046
2047         return rc;
2048 }
2049
2050
2051 static struct create_durable *
2052 create_durable_buf(void)
2053 {
2054         struct create_durable *buf;
2055
2056         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2057         if (!buf)
2058                 return NULL;
2059
2060         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2061                                         (struct create_durable, Data));
2062         buf->ccontext.DataLength = cpu_to_le32(16);
2063         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2064                                 (struct create_durable, Name));
2065         buf->ccontext.NameLength = cpu_to_le16(4);
2066         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
2067         buf->Name[0] = 'D';
2068         buf->Name[1] = 'H';
2069         buf->Name[2] = 'n';
2070         buf->Name[3] = 'Q';
2071         return buf;
2072 }
2073
2074 static struct create_durable *
2075 create_reconnect_durable_buf(struct cifs_fid *fid)
2076 {
2077         struct create_durable *buf;
2078
2079         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
2080         if (!buf)
2081                 return NULL;
2082
2083         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2084                                         (struct create_durable, Data));
2085         buf->ccontext.DataLength = cpu_to_le32(16);
2086         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2087                                 (struct create_durable, Name));
2088         buf->ccontext.NameLength = cpu_to_le16(4);
2089         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
2090         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
2091         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
2092         buf->Name[0] = 'D';
2093         buf->Name[1] = 'H';
2094         buf->Name[2] = 'n';
2095         buf->Name[3] = 'C';
2096         return buf;
2097 }
2098
2099 static void
2100 parse_query_id_ctxt(struct create_context *cc, struct smb2_file_all_info *buf)
2101 {
2102         struct create_disk_id_rsp *pdisk_id = (struct create_disk_id_rsp *)cc;
2103
2104         cifs_dbg(FYI, "parse query id context 0x%llx 0x%llx\n",
2105                 pdisk_id->DiskFileId, pdisk_id->VolumeId);
2106         buf->IndexNumber = pdisk_id->DiskFileId;
2107 }
2108
2109 static void
2110 parse_posix_ctxt(struct create_context *cc, struct smb2_file_all_info *info,
2111                  struct create_posix_rsp *posix)
2112 {
2113         int sid_len;
2114         u8 *beg = (u8 *)cc + le16_to_cpu(cc->DataOffset);
2115         u8 *end = beg + le32_to_cpu(cc->DataLength);
2116         u8 *sid;
2117
2118         memset(posix, 0, sizeof(*posix));
2119
2120         posix->nlink = le32_to_cpu(*(__le32 *)(beg + 0));
2121         posix->reparse_tag = le32_to_cpu(*(__le32 *)(beg + 4));
2122         posix->mode = le32_to_cpu(*(__le32 *)(beg + 8));
2123
2124         sid = beg + 12;
2125         sid_len = posix_info_sid_size(sid, end);
2126         if (sid_len < 0) {
2127                 cifs_dbg(VFS, "bad owner sid in posix create response\n");
2128                 return;
2129         }
2130         memcpy(&posix->owner, sid, sid_len);
2131
2132         sid = sid + sid_len;
2133         sid_len = posix_info_sid_size(sid, end);
2134         if (sid_len < 0) {
2135                 cifs_dbg(VFS, "bad group sid in posix create response\n");
2136                 return;
2137         }
2138         memcpy(&posix->group, sid, sid_len);
2139
2140         cifs_dbg(FYI, "nlink=%d mode=%o reparse_tag=%x\n",
2141                  posix->nlink, posix->mode, posix->reparse_tag);
2142 }
2143
2144 void
2145 smb2_parse_contexts(struct TCP_Server_Info *server,
2146                     struct smb2_create_rsp *rsp,
2147                     unsigned int *epoch, char *lease_key, __u8 *oplock,
2148                     struct smb2_file_all_info *buf,
2149                     struct create_posix_rsp *posix)
2150 {
2151         char *data_offset;
2152         struct create_context *cc;
2153         unsigned int next;
2154         unsigned int remaining;
2155         char *name;
2156         static const char smb3_create_tag_posix[] = {
2157                 0x93, 0xAD, 0x25, 0x50, 0x9C,
2158                 0xB4, 0x11, 0xE7, 0xB4, 0x23, 0x83,
2159                 0xDE, 0x96, 0x8B, 0xCD, 0x7C
2160         };
2161
2162         *oplock = 0;
2163         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
2164         remaining = le32_to_cpu(rsp->CreateContextsLength);
2165         cc = (struct create_context *)data_offset;
2166
2167         /* Initialize inode number to 0 in case no valid data in qfid context */
2168         if (buf)
2169                 buf->IndexNumber = 0;
2170
2171         while (remaining >= sizeof(struct create_context)) {
2172                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
2173                 if (le16_to_cpu(cc->NameLength) == 4 &&
2174                     strncmp(name, SMB2_CREATE_REQUEST_LEASE, 4) == 0)
2175                         *oplock = server->ops->parse_lease_buf(cc, epoch,
2176                                                            lease_key);
2177                 else if (buf && (le16_to_cpu(cc->NameLength) == 4) &&
2178                     strncmp(name, SMB2_CREATE_QUERY_ON_DISK_ID, 4) == 0)
2179                         parse_query_id_ctxt(cc, buf);
2180                 else if ((le16_to_cpu(cc->NameLength) == 16)) {
2181                         if (posix &&
2182                             memcmp(name, smb3_create_tag_posix, 16) == 0)
2183                                 parse_posix_ctxt(cc, buf, posix);
2184                 }
2185                 /* else {
2186                         cifs_dbg(FYI, "Context not matched with len %d\n",
2187                                 le16_to_cpu(cc->NameLength));
2188                         cifs_dump_mem("Cctxt name: ", name, 4);
2189                 } */
2190
2191                 next = le32_to_cpu(cc->Next);
2192                 if (!next)
2193                         break;
2194                 remaining -= next;
2195                 cc = (struct create_context *)((char *)cc + next);
2196         }
2197
2198         if (rsp->OplockLevel != SMB2_OPLOCK_LEVEL_LEASE)
2199                 *oplock = rsp->OplockLevel;
2200
2201         return;
2202 }
2203
2204 static int
2205 add_lease_context(struct TCP_Server_Info *server,
2206                   struct smb2_create_req *req,
2207                   struct kvec *iov,
2208                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
2209 {
2210         unsigned int num = *num_iovec;
2211
2212         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
2213         if (iov[num].iov_base == NULL)
2214                 return -ENOMEM;
2215         iov[num].iov_len = server->vals->create_lease_size;
2216         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
2217         *num_iovec = num + 1;
2218         return 0;
2219 }
2220
2221 static struct create_durable_v2 *
2222 create_durable_v2_buf(struct cifs_open_parms *oparms)
2223 {
2224         struct cifs_fid *pfid = oparms->fid;
2225         struct create_durable_v2 *buf;
2226
2227         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
2228         if (!buf)
2229                 return NULL;
2230
2231         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2232                                         (struct create_durable_v2, dcontext));
2233         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
2234         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2235                                 (struct create_durable_v2, Name));
2236         buf->ccontext.NameLength = cpu_to_le16(4);
2237
2238         /*
2239          * NB: Handle timeout defaults to 0, which allows server to choose
2240          * (most servers default to 120 seconds) and most clients default to 0.
2241          * This can be overridden at mount ("handletimeout=") if the user wants
2242          * a different persistent (or resilient) handle timeout for all opens
2243          * on a particular SMB3 mount.
2244          */
2245         buf->dcontext.Timeout = cpu_to_le32(oparms->tcon->handle_timeout);
2246         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2247         generate_random_uuid(buf->dcontext.CreateGuid);
2248         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
2249
2250         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
2251         buf->Name[0] = 'D';
2252         buf->Name[1] = 'H';
2253         buf->Name[2] = '2';
2254         buf->Name[3] = 'Q';
2255         return buf;
2256 }
2257
2258 static struct create_durable_handle_reconnect_v2 *
2259 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
2260 {
2261         struct create_durable_handle_reconnect_v2 *buf;
2262
2263         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
2264                         GFP_KERNEL);
2265         if (!buf)
2266                 return NULL;
2267
2268         buf->ccontext.DataOffset =
2269                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2270                                      dcontext));
2271         buf->ccontext.DataLength =
2272                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
2273         buf->ccontext.NameOffset =
2274                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
2275                             Name));
2276         buf->ccontext.NameLength = cpu_to_le16(4);
2277
2278         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
2279         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
2280         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
2281         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
2282
2283         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
2284         buf->Name[0] = 'D';
2285         buf->Name[1] = 'H';
2286         buf->Name[2] = '2';
2287         buf->Name[3] = 'C';
2288         return buf;
2289 }
2290
2291 static int
2292 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
2293                     struct cifs_open_parms *oparms)
2294 {
2295         unsigned int num = *num_iovec;
2296
2297         iov[num].iov_base = create_durable_v2_buf(oparms);
2298         if (iov[num].iov_base == NULL)
2299                 return -ENOMEM;
2300         iov[num].iov_len = sizeof(struct create_durable_v2);
2301         *num_iovec = num + 1;
2302         return 0;
2303 }
2304
2305 static int
2306 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
2307                     struct cifs_open_parms *oparms)
2308 {
2309         unsigned int num = *num_iovec;
2310
2311         /* indicate that we don't need to relock the file */
2312         oparms->reconnect = false;
2313
2314         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
2315         if (iov[num].iov_base == NULL)
2316                 return -ENOMEM;
2317         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
2318         *num_iovec = num + 1;
2319         return 0;
2320 }
2321
2322 static int
2323 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
2324                     struct cifs_open_parms *oparms, bool use_persistent)
2325 {
2326         unsigned int num = *num_iovec;
2327
2328         if (use_persistent) {
2329                 if (oparms->reconnect)
2330                         return add_durable_reconnect_v2_context(iov, num_iovec,
2331                                                                 oparms);
2332                 else
2333                         return add_durable_v2_context(iov, num_iovec, oparms);
2334         }
2335
2336         if (oparms->reconnect) {
2337                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
2338                 /* indicate that we don't need to relock the file */
2339                 oparms->reconnect = false;
2340         } else
2341                 iov[num].iov_base = create_durable_buf();
2342         if (iov[num].iov_base == NULL)
2343                 return -ENOMEM;
2344         iov[num].iov_len = sizeof(struct create_durable);
2345         *num_iovec = num + 1;
2346         return 0;
2347 }
2348
2349 /* See MS-SMB2 2.2.13.2.7 */
2350 static struct crt_twarp_ctxt *
2351 create_twarp_buf(__u64 timewarp)
2352 {
2353         struct crt_twarp_ctxt *buf;
2354
2355         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
2356         if (!buf)
2357                 return NULL;
2358
2359         buf->ccontext.DataOffset = cpu_to_le16(offsetof
2360                                         (struct crt_twarp_ctxt, Timestamp));
2361         buf->ccontext.DataLength = cpu_to_le32(8);
2362         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2363                                 (struct crt_twarp_ctxt, Name));
2364         buf->ccontext.NameLength = cpu_to_le16(4);
2365         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
2366         buf->Name[0] = 'T';
2367         buf->Name[1] = 'W';
2368         buf->Name[2] = 'r';
2369         buf->Name[3] = 'p';
2370         buf->Timestamp = cpu_to_le64(timewarp);
2371         return buf;
2372 }
2373
2374 /* See MS-SMB2 2.2.13.2.7 */
2375 static int
2376 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
2377 {
2378         unsigned int num = *num_iovec;
2379
2380         iov[num].iov_base = create_twarp_buf(timewarp);
2381         if (iov[num].iov_base == NULL)
2382                 return -ENOMEM;
2383         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
2384         *num_iovec = num + 1;
2385         return 0;
2386 }
2387
2388 /* See http://technet.microsoft.com/en-us/library/hh509017(v=ws.10).aspx */
2389 static void setup_owner_group_sids(char *buf)
2390 {
2391         struct owner_group_sids *sids = (struct owner_group_sids *)buf;
2392
2393         /* Populate the user ownership fields S-1-5-88-1 */
2394         sids->owner.Revision = 1;
2395         sids->owner.NumAuth = 3;
2396         sids->owner.Authority[5] = 5;
2397         sids->owner.SubAuthorities[0] = cpu_to_le32(88);
2398         sids->owner.SubAuthorities[1] = cpu_to_le32(1);
2399         sids->owner.SubAuthorities[2] = cpu_to_le32(current_fsuid().val);
2400
2401         /* Populate the group ownership fields S-1-5-88-2 */
2402         sids->group.Revision = 1;
2403         sids->group.NumAuth = 3;
2404         sids->group.Authority[5] = 5;
2405         sids->group.SubAuthorities[0] = cpu_to_le32(88);
2406         sids->group.SubAuthorities[1] = cpu_to_le32(2);
2407         sids->group.SubAuthorities[2] = cpu_to_le32(current_fsgid().val);
2408
2409         cifs_dbg(FYI, "owner S-1-5-88-1-%d, group S-1-5-88-2-%d\n", current_fsuid().val, current_fsgid().val);
2410 }
2411
2412 /* See MS-SMB2 2.2.13.2.2 and MS-DTYP 2.4.6 */
2413 static struct crt_sd_ctxt *
2414 create_sd_buf(umode_t mode, bool set_owner, unsigned int *len)
2415 {
2416         struct crt_sd_ctxt *buf;
2417         __u8 *ptr, *aclptr;
2418         unsigned int acelen, acl_size, ace_count;
2419         unsigned int owner_offset = 0;
2420         unsigned int group_offset = 0;
2421         struct smb3_acl acl = {};
2422
2423         *len = round_up(sizeof(struct crt_sd_ctxt) + (sizeof(struct cifs_ace) * 4), 8);
2424
2425         if (set_owner) {
2426                 /* sizeof(struct owner_group_sids) is already multiple of 8 so no need to round */
2427                 *len += sizeof(struct owner_group_sids);
2428         }
2429
2430         buf = kzalloc(*len, GFP_KERNEL);
2431         if (buf == NULL)
2432                 return buf;
2433
2434         ptr = (__u8 *)&buf[1];
2435         if (set_owner) {
2436                 /* offset fields are from beginning of security descriptor not of create context */
2437                 owner_offset = ptr - (__u8 *)&buf->sd;
2438                 buf->sd.OffsetOwner = cpu_to_le32(owner_offset);
2439                 group_offset = owner_offset + offsetof(struct owner_group_sids, group);
2440                 buf->sd.OffsetGroup = cpu_to_le32(group_offset);
2441
2442                 setup_owner_group_sids(ptr);
2443                 ptr += sizeof(struct owner_group_sids);
2444         } else {
2445                 buf->sd.OffsetOwner = 0;
2446                 buf->sd.OffsetGroup = 0;
2447         }
2448
2449         buf->ccontext.DataOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, sd));
2450         buf->ccontext.NameOffset = cpu_to_le16(offsetof(struct crt_sd_ctxt, Name));
2451         buf->ccontext.NameLength = cpu_to_le16(4);
2452         /* SMB2_CREATE_SD_BUFFER_TOKEN is "SecD" */
2453         buf->Name[0] = 'S';
2454         buf->Name[1] = 'e';
2455         buf->Name[2] = 'c';
2456         buf->Name[3] = 'D';
2457         buf->sd.Revision = 1;  /* Must be one see MS-DTYP 2.4.6 */
2458
2459         /*
2460          * ACL is "self relative" ie ACL is stored in contiguous block of memory
2461          * and "DP" ie the DACL is present
2462          */
2463         buf->sd.Control = cpu_to_le16(ACL_CONTROL_SR | ACL_CONTROL_DP);
2464
2465         /* offset owner, group and Sbz1 and SACL are all zero */
2466         buf->sd.OffsetDacl = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2467         /* Ship the ACL for now. we will copy it into buf later. */
2468         aclptr = ptr;
2469         ptr += sizeof(struct smb3_acl);
2470
2471         /* create one ACE to hold the mode embedded in reserved special SID */
2472         acelen = setup_special_mode_ACE((struct cifs_ace *)ptr, (__u64)mode);
2473         ptr += acelen;
2474         acl_size = acelen + sizeof(struct smb3_acl);
2475         ace_count = 1;
2476
2477         if (set_owner) {
2478                 /* we do not need to reallocate buffer to add the two more ACEs. plenty of space */
2479                 acelen = setup_special_user_owner_ACE((struct cifs_ace *)ptr);
2480                 ptr += acelen;
2481                 acl_size += acelen;
2482                 ace_count += 1;
2483         }
2484
2485         /* and one more ACE to allow access for authenticated users */
2486         acelen = setup_authusers_ACE((struct cifs_ace *)ptr);
2487         ptr += acelen;
2488         acl_size += acelen;
2489         ace_count += 1;
2490
2491         acl.AclRevision = ACL_REVISION; /* See 2.4.4.1 of MS-DTYP */
2492         acl.AclSize = cpu_to_le16(acl_size);
2493         acl.AceCount = cpu_to_le16(ace_count);
2494         /* acl.Sbz1 and Sbz2 MBZ so are not set here, but initialized above */
2495         memcpy(aclptr, &acl, sizeof(struct smb3_acl));
2496
2497         buf->ccontext.DataLength = cpu_to_le32(ptr - (__u8 *)&buf->sd);
2498         *len = round_up((unsigned int)(ptr - (__u8 *)buf), 8);
2499
2500         return buf;
2501 }
2502
2503 static int
2504 add_sd_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode, bool set_owner)
2505 {
2506         unsigned int num = *num_iovec;
2507         unsigned int len = 0;
2508
2509         iov[num].iov_base = create_sd_buf(mode, set_owner, &len);
2510         if (iov[num].iov_base == NULL)
2511                 return -ENOMEM;
2512         iov[num].iov_len = len;
2513         *num_iovec = num + 1;
2514         return 0;
2515 }
2516
2517 static struct crt_query_id_ctxt *
2518 create_query_id_buf(void)
2519 {
2520         struct crt_query_id_ctxt *buf;
2521
2522         buf = kzalloc(sizeof(struct crt_query_id_ctxt), GFP_KERNEL);
2523         if (!buf)
2524                 return NULL;
2525
2526         buf->ccontext.DataOffset = cpu_to_le16(0);
2527         buf->ccontext.DataLength = cpu_to_le32(0);
2528         buf->ccontext.NameOffset = cpu_to_le16(offsetof
2529                                 (struct crt_query_id_ctxt, Name));
2530         buf->ccontext.NameLength = cpu_to_le16(4);
2531         /* SMB2_CREATE_QUERY_ON_DISK_ID is "QFid" */
2532         buf->Name[0] = 'Q';
2533         buf->Name[1] = 'F';
2534         buf->Name[2] = 'i';
2535         buf->Name[3] = 'd';
2536         return buf;
2537 }
2538
2539 /* See MS-SMB2 2.2.13.2.9 */
2540 static int
2541 add_query_id_context(struct kvec *iov, unsigned int *num_iovec)
2542 {
2543         unsigned int num = *num_iovec;
2544
2545         iov[num].iov_base = create_query_id_buf();
2546         if (iov[num].iov_base == NULL)
2547                 return -ENOMEM;
2548         iov[num].iov_len = sizeof(struct crt_query_id_ctxt);
2549         *num_iovec = num + 1;
2550         return 0;
2551 }
2552
2553 static int
2554 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
2555                             const char *treename, const __le16 *path)
2556 {
2557         int treename_len, path_len;
2558         struct nls_table *cp;
2559         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
2560
2561         /*
2562          * skip leading "\\"
2563          */
2564         treename_len = strlen(treename);
2565         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
2566                 return -EINVAL;
2567
2568         treename += 2;
2569         treename_len -= 2;
2570
2571         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
2572
2573         /* make room for one path separator only if @path isn't empty */
2574         *out_len = treename_len + (path[0] ? 1 : 0) + path_len;
2575
2576         /*
2577          * final path needs to be 8-byte aligned as specified in
2578          * MS-SMB2 2.2.13 SMB2 CREATE Request.
2579          */
2580         *out_size = round_up(*out_len * sizeof(__le16), 8);
2581         *out_path = kzalloc(*out_size + sizeof(__le16) /* null */, GFP_KERNEL);
2582         if (!*out_path)
2583                 return -ENOMEM;
2584
2585         cp = load_nls_default();
2586         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2587
2588         /* Do not append the separator if the path is empty */
2589         if (path[0] != cpu_to_le16(0x0000)) {
2590                 UniStrcat((wchar_t *)*out_path, (wchar_t *)sep);
2591                 UniStrcat((wchar_t *)*out_path, (wchar_t *)path);
2592         }
2593
2594         unload_nls(cp);
2595
2596         return 0;
2597 }
2598
2599 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2600                                umode_t mode, struct cifs_tcon *tcon,
2601                                const char *full_path,
2602                                struct cifs_sb_info *cifs_sb)
2603 {
2604         struct smb_rqst rqst;
2605         struct smb2_create_req *req;
2606         struct smb2_create_rsp *rsp = NULL;
2607         struct cifs_ses *ses = tcon->ses;
2608         struct kvec iov[3]; /* make sure at least one for each open context */
2609         struct kvec rsp_iov = {NULL, 0};
2610         int resp_buftype;
2611         int uni_path_len;
2612         __le16 *copy_path = NULL;
2613         int copy_size;
2614         int rc = 0;
2615         unsigned int n_iov = 2;
2616         __u32 file_attributes = 0;
2617         char *pc_buf = NULL;
2618         int flags = 0;
2619         unsigned int total_len;
2620         __le16 *utf16_path = NULL;
2621         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2622
2623         cifs_dbg(FYI, "mkdir\n");
2624
2625         /* resource #1: path allocation */
2626         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2627         if (!utf16_path)
2628                 return -ENOMEM;
2629
2630         if (!ses || !server) {
2631                 rc = -EIO;
2632                 goto err_free_path;
2633         }
2634
2635         /* resource #2: request */
2636         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2637                                  (void **) &req, &total_len);
2638         if (rc)
2639                 goto err_free_path;
2640
2641
2642         if (smb3_encryption_required(tcon))
2643                 flags |= CIFS_TRANSFORM_REQ;
2644
2645         req->ImpersonationLevel = IL_IMPERSONATION;
2646         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2647         /* File attributes ignored on open (used in create though) */
2648         req->FileAttributes = cpu_to_le32(file_attributes);
2649         req->ShareAccess = FILE_SHARE_ALL_LE;
2650         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2651         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2652
2653         iov[0].iov_base = (char *)req;
2654         /* -1 since last byte is buf[0] which is sent below (path) */
2655         iov[0].iov_len = total_len - 1;
2656
2657         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2658
2659         /* [MS-SMB2] 2.2.13 NameOffset:
2660          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2661          * the SMB2 header, the file name includes a prefix that will
2662          * be processed during DFS name normalization as specified in
2663          * section 3.3.5.9. Otherwise, the file name is relative to
2664          * the share that is identified by the TreeId in the SMB2
2665          * header.
2666          */
2667         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2668                 int name_len;
2669
2670                 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2671                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2672                                                  &name_len,
2673                                                  tcon->tree_name, utf16_path);
2674                 if (rc)
2675                         goto err_free_req;
2676
2677                 req->NameLength = cpu_to_le16(name_len * 2);
2678                 uni_path_len = copy_size;
2679                 /* free before overwriting resource */
2680                 kfree(utf16_path);
2681                 utf16_path = copy_path;
2682         } else {
2683                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2684                 /* MUST set path len (NameLength) to 0 opening root of share */
2685                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2686                 if (uni_path_len % 8 != 0) {
2687                         copy_size = roundup(uni_path_len, 8);
2688                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2689                         if (!copy_path) {
2690                                 rc = -ENOMEM;
2691                                 goto err_free_req;
2692                         }
2693                         memcpy((char *)copy_path, (const char *)utf16_path,
2694                                uni_path_len);
2695                         uni_path_len = copy_size;
2696                         /* free before overwriting resource */
2697                         kfree(utf16_path);
2698                         utf16_path = copy_path;
2699                 }
2700         }
2701
2702         iov[1].iov_len = uni_path_len;
2703         iov[1].iov_base = utf16_path;
2704         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2705
2706         if (tcon->posix_extensions) {
2707                 /* resource #3: posix buf */
2708                 rc = add_posix_context(iov, &n_iov, mode);
2709                 if (rc)
2710                         goto err_free_req;
2711                 req->CreateContextsOffset = cpu_to_le32(
2712                         sizeof(struct smb2_create_req) +
2713                         iov[1].iov_len);
2714                 pc_buf = iov[n_iov-1].iov_base;
2715         }
2716
2717
2718         memset(&rqst, 0, sizeof(struct smb_rqst));
2719         rqst.rq_iov = iov;
2720         rqst.rq_nvec = n_iov;
2721
2722         /* no need to inc num_remote_opens because we close it just below */
2723         trace_smb3_posix_mkdir_enter(xid, tcon->tid, ses->Suid, full_path, CREATE_NOT_FILE,
2724                                     FILE_WRITE_ATTRIBUTES);
2725         /* resource #4: response buffer */
2726         rc = cifs_send_recv(xid, ses, server,
2727                             &rqst, &resp_buftype, flags, &rsp_iov);
2728         if (rc) {
2729                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2730                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2731                                            CREATE_NOT_FILE,
2732                                            FILE_WRITE_ATTRIBUTES, rc);
2733                 goto err_free_rsp_buf;
2734         }
2735
2736         /*
2737          * Although unlikely to be possible for rsp to be null and rc not set,
2738          * adding check below is slightly safer long term (and quiets Coverity
2739          * warning)
2740          */
2741         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2742         if (rsp == NULL) {
2743                 rc = -EIO;
2744                 kfree(pc_buf);
2745                 goto err_free_req;
2746         }
2747
2748         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
2749                                     CREATE_NOT_FILE, FILE_WRITE_ATTRIBUTES);
2750
2751         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2752
2753         /* Eventually save off posix specific response info and timestaps */
2754
2755 err_free_rsp_buf:
2756         free_rsp_buf(resp_buftype, rsp);
2757         kfree(pc_buf);
2758 err_free_req:
2759         cifs_small_buf_release(req);
2760 err_free_path:
2761         kfree(utf16_path);
2762         return rc;
2763 }
2764
2765 int
2766 SMB2_open_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
2767                struct smb_rqst *rqst, __u8 *oplock,
2768                struct cifs_open_parms *oparms, __le16 *path)
2769 {
2770         struct smb2_create_req *req;
2771         unsigned int n_iov = 2;
2772         __u32 file_attributes = 0;
2773         int copy_size;
2774         int uni_path_len;
2775         unsigned int total_len;
2776         struct kvec *iov = rqst->rq_iov;
2777         __le16 *copy_path;
2778         int rc;
2779
2780         rc = smb2_plain_req_init(SMB2_CREATE, tcon, server,
2781                                  (void **) &req, &total_len);
2782         if (rc)
2783                 return rc;
2784
2785         iov[0].iov_base = (char *)req;
2786         /* -1 since last byte is buf[0] which is sent below (path) */
2787         iov[0].iov_len = total_len - 1;
2788
2789         if (oparms->create_options & CREATE_OPTION_READONLY)
2790                 file_attributes |= ATTR_READONLY;
2791         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2792                 file_attributes |= ATTR_SYSTEM;
2793
2794         req->ImpersonationLevel = IL_IMPERSONATION;
2795         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2796         /* File attributes ignored on open (used in create though) */
2797         req->FileAttributes = cpu_to_le32(file_attributes);
2798         req->ShareAccess = FILE_SHARE_ALL_LE;
2799
2800         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2801         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2802         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2803
2804         /* [MS-SMB2] 2.2.13 NameOffset:
2805          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2806          * the SMB2 header, the file name includes a prefix that will
2807          * be processed during DFS name normalization as specified in
2808          * section 3.3.5.9. Otherwise, the file name is relative to
2809          * the share that is identified by the TreeId in the SMB2
2810          * header.
2811          */
2812         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2813                 int name_len;
2814
2815                 req->hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2816                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2817                                                  &name_len,
2818                                                  tcon->tree_name, path);
2819                 if (rc)
2820                         return rc;
2821                 req->NameLength = cpu_to_le16(name_len * 2);
2822                 uni_path_len = copy_size;
2823                 path = copy_path;
2824         } else {
2825                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2826                 /* MUST set path len (NameLength) to 0 opening root of share */
2827                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2828                 copy_size = round_up(uni_path_len, 8);
2829                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2830                 if (!copy_path)
2831                         return -ENOMEM;
2832                 memcpy((char *)copy_path, (const char *)path,
2833                        uni_path_len);
2834                 uni_path_len = copy_size;
2835                 path = copy_path;
2836         }
2837
2838         iov[1].iov_len = uni_path_len;
2839         iov[1].iov_base = path;
2840
2841         if ((!server->oplocks) || (tcon->no_lease))
2842                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2843
2844         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2845             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2846                 req->RequestedOplockLevel = *oplock;
2847         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2848                   (oparms->create_options & CREATE_NOT_FILE))
2849                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2850         else {
2851                 rc = add_lease_context(server, req, iov, &n_iov,
2852                                        oparms->fid->lease_key, oplock);
2853                 if (rc)
2854                         return rc;
2855         }
2856
2857         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2858                 rc = add_durable_context(iov, &n_iov, oparms,
2859                                         tcon->use_persistent);
2860                 if (rc)
2861                         return rc;
2862         }
2863
2864         if (tcon->posix_extensions) {
2865                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2866                 if (rc)
2867                         return rc;
2868         }
2869
2870         if (tcon->snapshot_time) {
2871                 cifs_dbg(FYI, "adding snapshot context\n");
2872                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2873                 if (rc)
2874                         return rc;
2875         }
2876
2877         if ((oparms->disposition != FILE_OPEN) && (oparms->cifs_sb)) {
2878                 bool set_mode;
2879                 bool set_owner;
2880
2881                 if ((oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MODE_FROM_SID) &&
2882                     (oparms->mode != ACL_NO_MODE))
2883                         set_mode = true;
2884                 else {
2885                         set_mode = false;
2886                         oparms->mode = ACL_NO_MODE;
2887                 }
2888
2889                 if (oparms->cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
2890                         set_owner = true;
2891                 else
2892                         set_owner = false;
2893
2894                 if (set_owner | set_mode) {
2895                         cifs_dbg(FYI, "add sd with mode 0x%x\n", oparms->mode);
2896                         rc = add_sd_context(iov, &n_iov, oparms->mode, set_owner);
2897                         if (rc)
2898                                 return rc;
2899                 }
2900         }
2901
2902         add_query_id_context(iov, &n_iov);
2903
2904         if (n_iov > 2) {
2905                 /*
2906                  * We have create contexts behind iov[1] (the file
2907                  * name), point at them from the main create request
2908                  */
2909                 req->CreateContextsOffset = cpu_to_le32(
2910                         sizeof(struct smb2_create_req) +
2911                         iov[1].iov_len);
2912                 req->CreateContextsLength = 0;
2913
2914                 for (unsigned int i = 2; i < (n_iov-1); i++) {
2915                         struct kvec *v = &iov[i];
2916                         size_t len = v->iov_len;
2917                         struct create_context *cctx =
2918                                 (struct create_context *)v->iov_base;
2919
2920                         cctx->Next = cpu_to_le32(len);
2921                         le32_add_cpu(&req->CreateContextsLength, len);
2922                 }
2923                 le32_add_cpu(&req->CreateContextsLength,
2924                              iov[n_iov-1].iov_len);
2925         }
2926
2927         rqst->rq_nvec = n_iov;
2928         return 0;
2929 }
2930
2931 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2932  * All other vectors are freed by kfree().
2933  */
2934 void
2935 SMB2_open_free(struct smb_rqst *rqst)
2936 {
2937         int i;
2938
2939         if (rqst && rqst->rq_iov) {
2940                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2941                 for (i = 1; i < rqst->rq_nvec; i++)
2942                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2943                                 kfree(rqst->rq_iov[i].iov_base);
2944         }
2945 }
2946
2947 int
2948 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2949           __u8 *oplock, struct smb2_file_all_info *buf,
2950           struct create_posix_rsp *posix,
2951           struct kvec *err_iov, int *buftype)
2952 {
2953         struct smb_rqst rqst;
2954         struct smb2_create_rsp *rsp = NULL;
2955         struct cifs_tcon *tcon = oparms->tcon;
2956         struct cifs_ses *ses = tcon->ses;
2957         struct TCP_Server_Info *server = cifs_pick_channel(ses);
2958         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2959         struct kvec rsp_iov = {NULL, 0};
2960         int resp_buftype = CIFS_NO_BUFFER;
2961         int rc = 0;
2962         int flags = 0;
2963
2964         cifs_dbg(FYI, "create/open\n");
2965         if (!ses || !server)
2966                 return -EIO;
2967
2968         if (smb3_encryption_required(tcon))
2969                 flags |= CIFS_TRANSFORM_REQ;
2970
2971         memset(&rqst, 0, sizeof(struct smb_rqst));
2972         memset(&iov, 0, sizeof(iov));
2973         rqst.rq_iov = iov;
2974         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2975
2976         rc = SMB2_open_init(tcon, server,
2977                             &rqst, oplock, oparms, path);
2978         if (rc)
2979                 goto creat_exit;
2980
2981         trace_smb3_open_enter(xid, tcon->tid, tcon->ses->Suid, oparms->path,
2982                 oparms->create_options, oparms->desired_access);
2983
2984         rc = cifs_send_recv(xid, ses, server,
2985                             &rqst, &resp_buftype, flags,
2986                             &rsp_iov);
2987         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2988
2989         if (rc != 0) {
2990                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2991                 if (err_iov && rsp) {
2992                         *err_iov = rsp_iov;
2993                         *buftype = resp_buftype;
2994                         resp_buftype = CIFS_NO_BUFFER;
2995                         rsp = NULL;
2996                 }
2997                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2998                                     oparms->create_options, oparms->desired_access, rc);
2999                 if (rc == -EREMCHG) {
3000                         pr_warn_once("server share %s deleted\n",
3001                                      tcon->tree_name);
3002                         tcon->need_reconnect = true;
3003                 }
3004                 goto creat_exit;
3005         } else if (rsp == NULL) /* unlikely to happen, but safer to check */
3006                 goto creat_exit;
3007         else
3008                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid, ses->Suid,
3009                                      oparms->create_options, oparms->desired_access);
3010
3011         atomic_inc(&tcon->num_remote_opens);
3012         oparms->fid->persistent_fid = rsp->PersistentFileId;
3013         oparms->fid->volatile_fid = rsp->VolatileFileId;
3014         oparms->fid->access = oparms->desired_access;
3015 #ifdef CONFIG_CIFS_DEBUG2
3016         oparms->fid->mid = le64_to_cpu(rsp->hdr.MessageId);
3017 #endif /* CIFS_DEBUG2 */
3018
3019         if (buf) {
3020                 buf->CreationTime = rsp->CreationTime;
3021                 buf->LastAccessTime = rsp->LastAccessTime;
3022                 buf->LastWriteTime = rsp->LastWriteTime;
3023                 buf->ChangeTime = rsp->ChangeTime;
3024                 buf->AllocationSize = rsp->AllocationSize;
3025                 buf->EndOfFile = rsp->EndofFile;
3026                 buf->Attributes = rsp->FileAttributes;
3027                 buf->NumberOfLinks = cpu_to_le32(1);
3028                 buf->DeletePending = 0;
3029         }
3030
3031
3032         smb2_parse_contexts(server, rsp, &oparms->fid->epoch,
3033                             oparms->fid->lease_key, oplock, buf, posix);
3034 creat_exit:
3035         SMB2_open_free(&rqst);
3036         free_rsp_buf(resp_buftype, rsp);
3037         return rc;
3038 }
3039
3040 int
3041 SMB2_ioctl_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3042                 struct smb_rqst *rqst,
3043                 u64 persistent_fid, u64 volatile_fid, u32 opcode,
3044                 char *in_data, u32 indatalen,
3045                 __u32 max_response_size)
3046 {
3047         struct smb2_ioctl_req *req;
3048         struct kvec *iov = rqst->rq_iov;
3049         unsigned int total_len;
3050         int rc;
3051         char *in_data_buf;
3052
3053         rc = smb2_ioctl_req_init(opcode, tcon, server,
3054                                  (void **) &req, &total_len);
3055         if (rc)
3056                 return rc;
3057
3058         if (indatalen) {
3059                 /*
3060                  * indatalen is usually small at a couple of bytes max, so
3061                  * just allocate through generic pool
3062                  */
3063                 in_data_buf = kmemdup(in_data, indatalen, GFP_NOFS);
3064                 if (!in_data_buf) {
3065                         cifs_small_buf_release(req);
3066                         return -ENOMEM;
3067                 }
3068         }
3069
3070         req->CtlCode = cpu_to_le32(opcode);
3071         req->PersistentFileId = persistent_fid;
3072         req->VolatileFileId = volatile_fid;
3073
3074         iov[0].iov_base = (char *)req;
3075         /*
3076          * If no input data, the size of ioctl struct in
3077          * protocol spec still includes a 1 byte data buffer,
3078          * but if input data passed to ioctl, we do not
3079          * want to double count this, so we do not send
3080          * the dummy one byte of data in iovec[0] if sending
3081          * input data (in iovec[1]).
3082          */
3083         if (indatalen) {
3084                 req->InputCount = cpu_to_le32(indatalen);
3085                 /* do not set InputOffset if no input data */
3086                 req->InputOffset =
3087                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
3088                 rqst->rq_nvec = 2;
3089                 iov[0].iov_len = total_len - 1;
3090                 iov[1].iov_base = in_data_buf;
3091                 iov[1].iov_len = indatalen;
3092         } else {
3093                 rqst->rq_nvec = 1;
3094                 iov[0].iov_len = total_len;
3095         }
3096
3097         req->OutputOffset = 0;
3098         req->OutputCount = 0; /* MBZ */
3099
3100         /*
3101          * In most cases max_response_size is set to 16K (CIFSMaxBufSize)
3102          * We Could increase default MaxOutputResponse, but that could require
3103          * more credits. Windows typically sets this smaller, but for some
3104          * ioctls it may be useful to allow server to send more. No point
3105          * limiting what the server can send as long as fits in one credit
3106          * We can not handle more than CIFS_MAX_BUF_SIZE yet but may want
3107          * to increase this limit up in the future.
3108          * Note that for snapshot queries that servers like Azure expect that
3109          * the first query be minimal size (and just used to get the number/size
3110          * of previous versions) so response size must be specified as EXACTLY
3111          * sizeof(struct snapshot_array) which is 16 when rounded up to multiple
3112          * of eight bytes.  Currently that is the only case where we set max
3113          * response size smaller.
3114          */
3115         req->MaxOutputResponse = cpu_to_le32(max_response_size);
3116         req->hdr.CreditCharge =
3117                 cpu_to_le16(DIV_ROUND_UP(max(indatalen, max_response_size),
3118                                          SMB2_MAX_BUFFER_SIZE));
3119         /* always an FSCTL (for now) */
3120         req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
3121
3122         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
3123         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
3124                 req->hdr.Flags |= SMB2_FLAGS_SIGNED;
3125
3126         return 0;
3127 }
3128
3129 void
3130 SMB2_ioctl_free(struct smb_rqst *rqst)
3131 {
3132         int i;
3133
3134         if (rqst && rqst->rq_iov) {
3135                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3136                 for (i = 1; i < rqst->rq_nvec; i++)
3137                         if (rqst->rq_iov[i].iov_base != smb2_padding)
3138                                 kfree(rqst->rq_iov[i].iov_base);
3139         }
3140 }
3141
3142
3143 /*
3144  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
3145  */
3146 int
3147 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3148            u64 volatile_fid, u32 opcode, char *in_data, u32 indatalen,
3149            u32 max_out_data_len, char **out_data,
3150            u32 *plen /* returned data len */)
3151 {
3152         struct smb_rqst rqst;
3153         struct smb2_ioctl_rsp *rsp = NULL;
3154         struct cifs_ses *ses;
3155         struct TCP_Server_Info *server;
3156         struct kvec iov[SMB2_IOCTL_IOV_SIZE];
3157         struct kvec rsp_iov = {NULL, 0};
3158         int resp_buftype = CIFS_NO_BUFFER;
3159         int rc = 0;
3160         int flags = 0;
3161
3162         cifs_dbg(FYI, "SMB2 IOCTL\n");
3163
3164         if (out_data != NULL)
3165                 *out_data = NULL;
3166
3167         /* zero out returned data len, in case of error */
3168         if (plen)
3169                 *plen = 0;
3170
3171         if (!tcon)
3172                 return -EIO;
3173
3174         ses = tcon->ses;
3175         if (!ses)
3176                 return -EIO;
3177
3178         server = cifs_pick_channel(ses);
3179         if (!server)
3180                 return -EIO;
3181
3182         if (smb3_encryption_required(tcon))
3183                 flags |= CIFS_TRANSFORM_REQ;
3184
3185         memset(&rqst, 0, sizeof(struct smb_rqst));
3186         memset(&iov, 0, sizeof(iov));
3187         rqst.rq_iov = iov;
3188         rqst.rq_nvec = SMB2_IOCTL_IOV_SIZE;
3189
3190         rc = SMB2_ioctl_init(tcon, server,
3191                              &rqst, persistent_fid, volatile_fid, opcode,
3192                              in_data, indatalen, max_out_data_len);
3193         if (rc)
3194                 goto ioctl_exit;
3195
3196         rc = cifs_send_recv(xid, ses, server,
3197                             &rqst, &resp_buftype, flags,
3198                             &rsp_iov);
3199         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
3200
3201         if (rc != 0)
3202                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
3203                                 ses->Suid, 0, opcode, rc);
3204
3205         if ((rc != 0) && (rc != -EINVAL) && (rc != -E2BIG)) {
3206                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3207                 goto ioctl_exit;
3208         } else if (rc == -EINVAL) {
3209                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
3210                     (opcode != FSCTL_SRV_COPYCHUNK)) {
3211                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3212                         goto ioctl_exit;
3213                 }
3214         } else if (rc == -E2BIG) {
3215                 if (opcode != FSCTL_QUERY_ALLOCATED_RANGES) {
3216                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
3217                         goto ioctl_exit;
3218                 }
3219         }
3220
3221         /* check if caller wants to look at return data or just return rc */
3222         if ((plen == NULL) || (out_data == NULL))
3223                 goto ioctl_exit;
3224
3225         /*
3226          * Although unlikely to be possible for rsp to be null and rc not set,
3227          * adding check below is slightly safer long term (and quiets Coverity
3228          * warning)
3229          */
3230         if (rsp == NULL) {
3231                 rc = -EIO;
3232                 goto ioctl_exit;
3233         }
3234
3235         *plen = le32_to_cpu(rsp->OutputCount);
3236
3237         /* We check for obvious errors in the output buffer length and offset */
3238         if (*plen == 0)
3239                 goto ioctl_exit; /* server returned no data */
3240         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
3241                 cifs_tcon_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
3242                 *plen = 0;
3243                 rc = -EIO;
3244                 goto ioctl_exit;
3245         }
3246
3247         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
3248                 cifs_tcon_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
3249                         le32_to_cpu(rsp->OutputOffset));
3250                 *plen = 0;
3251                 rc = -EIO;
3252                 goto ioctl_exit;
3253         }
3254
3255         *out_data = kmemdup((char *)rsp + le32_to_cpu(rsp->OutputOffset),
3256                             *plen, GFP_KERNEL);
3257         if (*out_data == NULL) {
3258                 rc = -ENOMEM;
3259                 goto ioctl_exit;
3260         }
3261
3262 ioctl_exit:
3263         SMB2_ioctl_free(&rqst);
3264         free_rsp_buf(resp_buftype, rsp);
3265         return rc;
3266 }
3267
3268 /*
3269  *   Individual callers to ioctl worker function follow
3270  */
3271
3272 int
3273 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
3274                      u64 persistent_fid, u64 volatile_fid)
3275 {
3276         int rc;
3277         struct  compress_ioctl fsctl_input;
3278         char *ret_data = NULL;
3279
3280         fsctl_input.CompressionState =
3281                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
3282
3283         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
3284                         FSCTL_SET_COMPRESSION,
3285                         (char *)&fsctl_input /* data input */,
3286                         2 /* in data len */, CIFSMaxBufSize /* max out data */,
3287                         &ret_data /* out data */, NULL);
3288
3289         cifs_dbg(FYI, "set compression rc %d\n", rc);
3290
3291         return rc;
3292 }
3293
3294 int
3295 SMB2_close_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3296                 struct smb_rqst *rqst,
3297                 u64 persistent_fid, u64 volatile_fid, bool query_attrs)
3298 {
3299         struct smb2_close_req *req;
3300         struct kvec *iov = rqst->rq_iov;
3301         unsigned int total_len;
3302         int rc;
3303
3304         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, server,
3305                                  (void **) &req, &total_len);
3306         if (rc)
3307                 return rc;
3308
3309         req->PersistentFileId = persistent_fid;
3310         req->VolatileFileId = volatile_fid;
3311         if (query_attrs)
3312                 req->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
3313         else
3314                 req->Flags = 0;
3315         iov[0].iov_base = (char *)req;
3316         iov[0].iov_len = total_len;
3317
3318         return 0;
3319 }
3320
3321 void
3322 SMB2_close_free(struct smb_rqst *rqst)
3323 {
3324         if (rqst && rqst->rq_iov)
3325                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3326 }
3327
3328 int
3329 __SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3330              u64 persistent_fid, u64 volatile_fid,
3331              struct smb2_file_network_open_info *pbuf)
3332 {
3333         struct smb_rqst rqst;
3334         struct smb2_close_rsp *rsp = NULL;
3335         struct cifs_ses *ses = tcon->ses;
3336         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3337         struct kvec iov[1];
3338         struct kvec rsp_iov;
3339         int resp_buftype = CIFS_NO_BUFFER;
3340         int rc = 0;
3341         int flags = 0;
3342         bool query_attrs = false;
3343
3344         cifs_dbg(FYI, "Close\n");
3345
3346         if (!ses || !server)
3347                 return -EIO;
3348
3349         if (smb3_encryption_required(tcon))
3350                 flags |= CIFS_TRANSFORM_REQ;
3351
3352         memset(&rqst, 0, sizeof(struct smb_rqst));
3353         memset(&iov, 0, sizeof(iov));
3354         rqst.rq_iov = iov;
3355         rqst.rq_nvec = 1;
3356
3357         /* check if need to ask server to return timestamps in close response */
3358         if (pbuf)
3359                 query_attrs = true;
3360
3361         trace_smb3_close_enter(xid, persistent_fid, tcon->tid, ses->Suid);
3362         rc = SMB2_close_init(tcon, server,
3363                              &rqst, persistent_fid, volatile_fid,
3364                              query_attrs);
3365         if (rc)
3366                 goto close_exit;
3367
3368         rc = cifs_send_recv(xid, ses, server,
3369                             &rqst, &resp_buftype, flags, &rsp_iov);
3370         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
3371
3372         if (rc != 0) {
3373                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
3374                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
3375                                      rc);
3376                 goto close_exit;
3377         } else {
3378                 trace_smb3_close_done(xid, persistent_fid, tcon->tid,
3379                                       ses->Suid);
3380                 /*
3381                  * Note that have to subtract 4 since struct network_open_info
3382                  * has a final 4 byte pad that close response does not have
3383                  */
3384                 if (pbuf)
3385                         memcpy(pbuf, (char *)&rsp->CreationTime, sizeof(*pbuf) - 4);
3386         }
3387
3388         atomic_dec(&tcon->num_remote_opens);
3389 close_exit:
3390         SMB2_close_free(&rqst);
3391         free_rsp_buf(resp_buftype, rsp);
3392
3393         /* retry close in a worker thread if this one is interrupted */
3394         if (is_interrupt_error(rc)) {
3395                 int tmp_rc;
3396
3397                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
3398                                                      volatile_fid);
3399                 if (tmp_rc)
3400                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
3401                                  persistent_fid, tmp_rc);
3402         }
3403         return rc;
3404 }
3405
3406 int
3407 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
3408                 u64 persistent_fid, u64 volatile_fid)
3409 {
3410         return __SMB2_close(xid, tcon, persistent_fid, volatile_fid, NULL);
3411 }
3412
3413 int
3414 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
3415                   struct kvec *iov, unsigned int min_buf_size)
3416 {
3417         unsigned int smb_len = iov->iov_len;
3418         char *end_of_smb = smb_len + (char *)iov->iov_base;
3419         char *begin_of_buf = offset + (char *)iov->iov_base;
3420         char *end_of_buf = begin_of_buf + buffer_length;
3421
3422
3423         if (buffer_length < min_buf_size) {
3424                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
3425                          buffer_length, min_buf_size);
3426                 return -EINVAL;
3427         }
3428
3429         /* check if beyond RFC1001 maximum length */
3430         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
3431                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
3432                          buffer_length, smb_len);
3433                 return -EINVAL;
3434         }
3435
3436         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
3437                 cifs_dbg(VFS, "Invalid server response, bad offset to data\n");
3438                 return -EINVAL;
3439         }
3440
3441         return 0;
3442 }
3443
3444 /*
3445  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
3446  * Caller must free buffer.
3447  */
3448 int
3449 smb2_validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
3450                            struct kvec *iov, unsigned int minbufsize,
3451                            char *data)
3452 {
3453         char *begin_of_buf = offset + (char *)iov->iov_base;
3454         int rc;
3455
3456         if (!data)
3457                 return -EINVAL;
3458
3459         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
3460         if (rc)
3461                 return rc;
3462
3463         memcpy(data, begin_of_buf, minbufsize);
3464
3465         return 0;
3466 }
3467
3468 int
3469 SMB2_query_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3470                      struct smb_rqst *rqst,
3471                      u64 persistent_fid, u64 volatile_fid,
3472                      u8 info_class, u8 info_type, u32 additional_info,
3473                      size_t output_len, size_t input_len, void *input)
3474 {
3475         struct smb2_query_info_req *req;
3476         struct kvec *iov = rqst->rq_iov;
3477         unsigned int total_len;
3478         int rc;
3479
3480         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
3481                                  (void **) &req, &total_len);
3482         if (rc)
3483                 return rc;
3484
3485         req->InfoType = info_type;
3486         req->FileInfoClass = info_class;
3487         req->PersistentFileId = persistent_fid;
3488         req->VolatileFileId = volatile_fid;
3489         req->AdditionalInformation = cpu_to_le32(additional_info);
3490
3491         req->OutputBufferLength = cpu_to_le32(output_len);
3492         if (input_len) {
3493                 req->InputBufferLength = cpu_to_le32(input_len);
3494                 /* total_len for smb query request never close to le16 max */
3495                 req->InputBufferOffset = cpu_to_le16(total_len - 1);
3496                 memcpy(req->Buffer, input, input_len);
3497         }
3498
3499         iov[0].iov_base = (char *)req;
3500         /* 1 for Buffer */
3501         iov[0].iov_len = total_len - 1 + input_len;
3502         return 0;
3503 }
3504
3505 void
3506 SMB2_query_info_free(struct smb_rqst *rqst)
3507 {
3508         if (rqst && rqst->rq_iov)
3509                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3510 }
3511
3512 static int
3513 query_info(const unsigned int xid, struct cifs_tcon *tcon,
3514            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
3515            u32 additional_info, size_t output_len, size_t min_len, void **data,
3516                 u32 *dlen)
3517 {
3518         struct smb_rqst rqst;
3519         struct smb2_query_info_rsp *rsp = NULL;
3520         struct kvec iov[1];
3521         struct kvec rsp_iov;
3522         int rc = 0;
3523         int resp_buftype = CIFS_NO_BUFFER;
3524         struct cifs_ses *ses = tcon->ses;
3525         struct TCP_Server_Info *server;
3526         int flags = 0;
3527         bool allocated = false;
3528
3529         cifs_dbg(FYI, "Query Info\n");
3530
3531         if (!ses)
3532                 return -EIO;
3533         server = cifs_pick_channel(ses);
3534         if (!server)
3535                 return -EIO;
3536
3537         if (smb3_encryption_required(tcon))
3538                 flags |= CIFS_TRANSFORM_REQ;
3539
3540         memset(&rqst, 0, sizeof(struct smb_rqst));
3541         memset(&iov, 0, sizeof(iov));
3542         rqst.rq_iov = iov;
3543         rqst.rq_nvec = 1;
3544
3545         rc = SMB2_query_info_init(tcon, server,
3546                                   &rqst, persistent_fid, volatile_fid,
3547                                   info_class, info_type, additional_info,
3548                                   output_len, 0, NULL);
3549         if (rc)
3550                 goto qinf_exit;
3551
3552         trace_smb3_query_info_enter(xid, persistent_fid, tcon->tid,
3553                                     ses->Suid, info_class, (__u32)info_type);
3554
3555         rc = cifs_send_recv(xid, ses, server,
3556                             &rqst, &resp_buftype, flags, &rsp_iov);
3557         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
3558
3559         if (rc) {
3560                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
3561                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
3562                                 ses->Suid, info_class, (__u32)info_type, rc);
3563                 goto qinf_exit;
3564         }
3565
3566         trace_smb3_query_info_done(xid, persistent_fid, tcon->tid,
3567                                 ses->Suid, info_class, (__u32)info_type);
3568
3569         if (dlen) {
3570                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
3571                 if (!*data) {
3572                         *data = kmalloc(*dlen, GFP_KERNEL);
3573                         if (!*data) {
3574                                 cifs_tcon_dbg(VFS,
3575                                         "Error %d allocating memory for acl\n",
3576                                         rc);
3577                                 *dlen = 0;
3578                                 rc = -ENOMEM;
3579                                 goto qinf_exit;
3580                         }
3581                         allocated = true;
3582                 }
3583         }
3584
3585         rc = smb2_validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
3586                                         le32_to_cpu(rsp->OutputBufferLength),
3587                                         &rsp_iov, dlen ? *dlen : min_len, *data);
3588         if (rc && allocated) {
3589                 kfree(*data);
3590                 *data = NULL;
3591                 *dlen = 0;
3592         }
3593
3594 qinf_exit:
3595         SMB2_query_info_free(&rqst);
3596         free_rsp_buf(resp_buftype, rsp);
3597         return rc;
3598 }
3599
3600 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3601         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
3602 {
3603         return query_info(xid, tcon, persistent_fid, volatile_fid,
3604                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
3605                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
3606                           sizeof(struct smb2_file_all_info), (void **)&data,
3607                           NULL);
3608 }
3609
3610 #if 0
3611 /* currently unused, as now we are doing compounding instead (see smb311_posix_query_path_info) */
3612 int
3613 SMB311_posix_query_info(const unsigned int xid, struct cifs_tcon *tcon,
3614                 u64 persistent_fid, u64 volatile_fid, struct smb311_posix_qinfo *data, u32 *plen)
3615 {
3616         size_t output_len = sizeof(struct smb311_posix_qinfo *) +
3617                         (sizeof(struct cifs_sid) * 2) + (PATH_MAX * 2);
3618         *plen = 0;
3619
3620         return query_info(xid, tcon, persistent_fid, volatile_fid,
3621                           SMB_FIND_FILE_POSIX_INFO, SMB2_O_INFO_FILE, 0,
3622                           output_len, sizeof(struct smb311_posix_qinfo), (void **)&data, plen);
3623         /* Note caller must free "data" (passed in above). It may be allocated in query_info call */
3624 }
3625 #endif
3626
3627 int
3628 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
3629                u64 persistent_fid, u64 volatile_fid,
3630                void **data, u32 *plen, u32 extra_info)
3631 {
3632         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO |
3633                                 extra_info;
3634         *plen = 0;
3635
3636         return query_info(xid, tcon, persistent_fid, volatile_fid,
3637                           0, SMB2_O_INFO_SECURITY, additional_info,
3638                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
3639 }
3640
3641 int
3642 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
3643                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
3644 {
3645         return query_info(xid, tcon, persistent_fid, volatile_fid,
3646                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
3647                           sizeof(struct smb2_file_internal_info),
3648                           sizeof(struct smb2_file_internal_info),
3649                           (void **)&uniqueid, NULL);
3650 }
3651
3652 /*
3653  * CHANGE_NOTIFY Request is sent to get notifications on changes to a directory
3654  * See MS-SMB2 2.2.35 and 2.2.36
3655  */
3656
3657 static int
3658 SMB2_notify_init(const unsigned int xid, struct smb_rqst *rqst,
3659                  struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3660                  u64 persistent_fid, u64 volatile_fid,
3661                  u32 completion_filter, bool watch_tree)
3662 {
3663         struct smb2_change_notify_req *req;
3664         struct kvec *iov = rqst->rq_iov;
3665         unsigned int total_len;
3666         int rc;
3667
3668         rc = smb2_plain_req_init(SMB2_CHANGE_NOTIFY, tcon, server,
3669                                  (void **) &req, &total_len);
3670         if (rc)
3671                 return rc;
3672
3673         req->PersistentFileId = persistent_fid;
3674         req->VolatileFileId = volatile_fid;
3675         /* See note 354 of MS-SMB2, 64K max */
3676         req->OutputBufferLength =
3677                 cpu_to_le32(SMB2_MAX_BUFFER_SIZE - MAX_SMB2_HDR_SIZE);
3678         req->CompletionFilter = cpu_to_le32(completion_filter);
3679         if (watch_tree)
3680                 req->Flags = cpu_to_le16(SMB2_WATCH_TREE);
3681         else
3682                 req->Flags = 0;
3683
3684         iov[0].iov_base = (char *)req;
3685         iov[0].iov_len = total_len;
3686
3687         return 0;
3688 }
3689
3690 int
3691 SMB2_change_notify(const unsigned int xid, struct cifs_tcon *tcon,
3692                 u64 persistent_fid, u64 volatile_fid, bool watch_tree,
3693                 u32 completion_filter, u32 max_out_data_len, char **out_data,
3694                 u32 *plen /* returned data len */)
3695 {
3696         struct cifs_ses *ses = tcon->ses;
3697         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3698         struct smb_rqst rqst;
3699         struct smb2_change_notify_rsp *smb_rsp;
3700         struct kvec iov[1];
3701         struct kvec rsp_iov = {NULL, 0};
3702         int resp_buftype = CIFS_NO_BUFFER;
3703         int flags = 0;
3704         int rc = 0;
3705
3706         cifs_dbg(FYI, "change notify\n");
3707         if (!ses || !server)
3708                 return -EIO;
3709
3710         if (smb3_encryption_required(tcon))
3711                 flags |= CIFS_TRANSFORM_REQ;
3712
3713         memset(&rqst, 0, sizeof(struct smb_rqst));
3714         memset(&iov, 0, sizeof(iov));
3715         if (plen)
3716                 *plen = 0;
3717
3718         rqst.rq_iov = iov;
3719         rqst.rq_nvec = 1;
3720
3721         rc = SMB2_notify_init(xid, &rqst, tcon, server,
3722                               persistent_fid, volatile_fid,
3723                               completion_filter, watch_tree);
3724         if (rc)
3725                 goto cnotify_exit;
3726
3727         trace_smb3_notify_enter(xid, persistent_fid, tcon->tid, ses->Suid,
3728                                 (u8)watch_tree, completion_filter);
3729         rc = cifs_send_recv(xid, ses, server,
3730                             &rqst, &resp_buftype, flags, &rsp_iov);
3731
3732         if (rc != 0) {
3733                 cifs_stats_fail_inc(tcon, SMB2_CHANGE_NOTIFY_HE);
3734                 trace_smb3_notify_err(xid, persistent_fid, tcon->tid, ses->Suid,
3735                                 (u8)watch_tree, completion_filter, rc);
3736         } else {
3737                 trace_smb3_notify_done(xid, persistent_fid, tcon->tid,
3738                         ses->Suid, (u8)watch_tree, completion_filter);
3739                 /* validate that notify information is plausible */
3740                 if ((rsp_iov.iov_base == NULL) ||
3741                     (rsp_iov.iov_len < sizeof(struct smb2_change_notify_rsp) + 1))
3742                         goto cnotify_exit;
3743
3744                 smb_rsp = (struct smb2_change_notify_rsp *)rsp_iov.iov_base;
3745
3746                 smb2_validate_iov(le16_to_cpu(smb_rsp->OutputBufferOffset),
3747                                 le32_to_cpu(smb_rsp->OutputBufferLength), &rsp_iov,
3748                                 sizeof(struct file_notify_information));
3749
3750                 *out_data = kmemdup((char *)smb_rsp + le16_to_cpu(smb_rsp->OutputBufferOffset),
3751                                 le32_to_cpu(smb_rsp->OutputBufferLength), GFP_KERNEL);
3752                 if (*out_data == NULL) {
3753                         rc = -ENOMEM;
3754                         goto cnotify_exit;
3755                 } else if (plen)
3756                         *plen = le32_to_cpu(smb_rsp->OutputBufferLength);
3757         }
3758
3759  cnotify_exit:
3760         if (rqst.rq_iov)
3761                 cifs_small_buf_release(rqst.rq_iov[0].iov_base); /* request */
3762         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3763         return rc;
3764 }
3765
3766
3767
3768 /*
3769  * This is a no-op for now. We're not really interested in the reply, but
3770  * rather in the fact that the server sent one and that server->lstrp
3771  * gets updated.
3772  *
3773  * FIXME: maybe we should consider checking that the reply matches request?
3774  */
3775 static void
3776 smb2_echo_callback(struct mid_q_entry *mid)
3777 {
3778         struct TCP_Server_Info *server = mid->callback_data;
3779         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
3780         struct cifs_credits credits = { .value = 0, .instance = 0 };
3781
3782         if (mid->mid_state == MID_RESPONSE_RECEIVED
3783             || mid->mid_state == MID_RESPONSE_MALFORMED) {
3784                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
3785                 credits.instance = server->reconnect_instance;
3786         }
3787
3788         release_mid(mid);
3789         add_credits(server, &credits, CIFS_ECHO_OP);
3790 }
3791
3792 void smb2_reconnect_server(struct work_struct *work)
3793 {
3794         struct TCP_Server_Info *server = container_of(work,
3795                                         struct TCP_Server_Info, reconnect.work);
3796         struct TCP_Server_Info *pserver;
3797         struct cifs_ses *ses, *ses2;
3798         struct cifs_tcon *tcon, *tcon2;
3799         struct list_head tmp_list, tmp_ses_list;
3800         bool tcon_exist = false, ses_exist = false;
3801         bool tcon_selected = false;
3802         int rc;
3803         bool resched = false;
3804
3805         /* If server is a channel, select the primary channel */
3806         pserver = SERVER_IS_CHAN(server) ? server->primary_server : server;
3807
3808         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
3809         mutex_lock(&pserver->reconnect_mutex);
3810
3811         INIT_LIST_HEAD(&tmp_list);
3812         INIT_LIST_HEAD(&tmp_ses_list);
3813         cifs_dbg(FYI, "Reconnecting tcons and channels\n");
3814
3815         spin_lock(&cifs_tcp_ses_lock);
3816         list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
3817                 spin_lock(&ses->ses_lock);
3818                 if (ses->ses_status == SES_EXITING) {
3819                         spin_unlock(&ses->ses_lock);
3820                         continue;
3821                 }
3822                 spin_unlock(&ses->ses_lock);
3823
3824                 tcon_selected = false;
3825
3826                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
3827                         if (tcon->need_reconnect || tcon->need_reopen_files) {
3828                                 tcon->tc_count++;
3829                                 list_add_tail(&tcon->rlist, &tmp_list);
3830                                 tcon_selected = tcon_exist = true;
3831                         }
3832                 }
3833                 /*
3834                  * IPC has the same lifetime as its session and uses its
3835                  * refcount.
3836                  */
3837                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
3838                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
3839                         tcon_selected = tcon_exist = true;
3840                         cifs_smb_ses_inc_refcount(ses);
3841                 }
3842                 /*
3843                  * handle the case where channel needs to reconnect
3844                  * binding session, but tcon is healthy (some other channel
3845                  * is active)
3846                  */
3847                 spin_lock(&ses->chan_lock);
3848                 if (!tcon_selected && cifs_chan_needs_reconnect(ses, server)) {
3849                         list_add_tail(&ses->rlist, &tmp_ses_list);
3850                         ses_exist = true;
3851                         cifs_smb_ses_inc_refcount(ses);
3852                 }
3853                 spin_unlock(&ses->chan_lock);
3854         }
3855         /*
3856          * Get the reference to server struct to be sure that the last call of
3857          * cifs_put_tcon() in the loop below won't release the server pointer.
3858          */
3859         if (tcon_exist || ses_exist)
3860                 server->srv_count++;
3861
3862         spin_unlock(&cifs_tcp_ses_lock);
3863
3864         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
3865                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3866                 if (!rc)
3867                         cifs_reopen_persistent_handles(tcon);
3868                 else
3869                         resched = true;
3870                 list_del_init(&tcon->rlist);
3871                 if (tcon->ipc)
3872                         cifs_put_smb_ses(tcon->ses);
3873                 else
3874                         cifs_put_tcon(tcon);
3875         }
3876
3877         if (!ses_exist)
3878                 goto done;
3879
3880         /* allocate a dummy tcon struct used for reconnect */
3881         tcon = tcon_info_alloc(false);
3882         if (!tcon) {
3883                 resched = true;
3884                 list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
3885                         list_del_init(&ses->rlist);
3886                         cifs_put_smb_ses(ses);
3887                 }
3888                 goto done;
3889         }
3890
3891         tcon->status = TID_GOOD;
3892         tcon->retry = false;
3893         tcon->need_reconnect = false;
3894
3895         /* now reconnect sessions for necessary channels */
3896         list_for_each_entry_safe(ses, ses2, &tmp_ses_list, rlist) {
3897                 tcon->ses = ses;
3898                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server);
3899                 if (rc)
3900                         resched = true;
3901                 list_del_init(&ses->rlist);
3902                 cifs_put_smb_ses(ses);
3903         }
3904         tconInfoFree(tcon);
3905
3906 done:
3907         cifs_dbg(FYI, "Reconnecting tcons and channels finished\n");
3908         if (resched)
3909                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
3910         mutex_unlock(&pserver->reconnect_mutex);
3911
3912         /* now we can safely release srv struct */
3913         if (tcon_exist || ses_exist)
3914                 cifs_put_tcp_session(server, 1);
3915 }
3916
3917 int
3918 SMB2_echo(struct TCP_Server_Info *server)
3919 {
3920         struct smb2_echo_req *req;
3921         int rc = 0;
3922         struct kvec iov[1];
3923         struct smb_rqst rqst = { .rq_iov = iov,
3924                                  .rq_nvec = 1 };
3925         unsigned int total_len;
3926
3927         cifs_dbg(FYI, "In echo request for conn_id %lld\n", server->conn_id);
3928
3929         spin_lock(&server->srv_lock);
3930         if (server->ops->need_neg &&
3931             server->ops->need_neg(server)) {
3932                 spin_unlock(&server->srv_lock);
3933                 /* No need to send echo on newly established connections */
3934                 mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
3935                 return rc;
3936         }
3937         spin_unlock(&server->srv_lock);
3938
3939         rc = smb2_plain_req_init(SMB2_ECHO, NULL, server,
3940                                  (void **)&req, &total_len);
3941         if (rc)
3942                 return rc;
3943
3944         req->hdr.CreditRequest = cpu_to_le16(1);
3945
3946         iov[0].iov_len = total_len;
3947         iov[0].iov_base = (char *)req;
3948
3949         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
3950                              server, CIFS_ECHO_OP, NULL);
3951         if (rc)
3952                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
3953
3954         cifs_small_buf_release(req);
3955         return rc;
3956 }
3957
3958 void
3959 SMB2_flush_free(struct smb_rqst *rqst)
3960 {
3961         if (rqst && rqst->rq_iov)
3962                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
3963 }
3964
3965 int
3966 SMB2_flush_init(const unsigned int xid, struct smb_rqst *rqst,
3967                 struct cifs_tcon *tcon, struct TCP_Server_Info *server,
3968                 u64 persistent_fid, u64 volatile_fid)
3969 {
3970         struct smb2_flush_req *req;
3971         struct kvec *iov = rqst->rq_iov;
3972         unsigned int total_len;
3973         int rc;
3974
3975         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, server,
3976                                  (void **) &req, &total_len);
3977         if (rc)
3978                 return rc;
3979
3980         req->PersistentFileId = persistent_fid;
3981         req->VolatileFileId = volatile_fid;
3982
3983         iov[0].iov_base = (char *)req;
3984         iov[0].iov_len = total_len;
3985
3986         return 0;
3987 }
3988
3989 int
3990 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3991            u64 volatile_fid)
3992 {
3993         struct cifs_ses *ses = tcon->ses;
3994         struct smb_rqst rqst;
3995         struct kvec iov[1];
3996         struct kvec rsp_iov = {NULL, 0};
3997         struct TCP_Server_Info *server = cifs_pick_channel(ses);
3998         int resp_buftype = CIFS_NO_BUFFER;
3999         int flags = 0;
4000         int rc = 0;
4001
4002         cifs_dbg(FYI, "flush\n");
4003         if (!ses || !(ses->server))
4004                 return -EIO;
4005
4006         if (smb3_encryption_required(tcon))
4007                 flags |= CIFS_TRANSFORM_REQ;
4008
4009         memset(&rqst, 0, sizeof(struct smb_rqst));
4010         memset(&iov, 0, sizeof(iov));
4011         rqst.rq_iov = iov;
4012         rqst.rq_nvec = 1;
4013
4014         rc = SMB2_flush_init(xid, &rqst, tcon, server,
4015                              persistent_fid, volatile_fid);
4016         if (rc)
4017                 goto flush_exit;
4018
4019         trace_smb3_flush_enter(xid, persistent_fid, tcon->tid, ses->Suid);
4020         rc = cifs_send_recv(xid, ses, server,
4021                             &rqst, &resp_buftype, flags, &rsp_iov);
4022
4023         if (rc != 0) {
4024                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
4025                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
4026                                      rc);
4027         } else
4028                 trace_smb3_flush_done(xid, persistent_fid, tcon->tid,
4029                                       ses->Suid);
4030
4031  flush_exit:
4032         SMB2_flush_free(&rqst);
4033         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4034         return rc;
4035 }
4036
4037 #ifdef CONFIG_CIFS_SMB_DIRECT
4038 static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms)
4039 {
4040         struct TCP_Server_Info *server = io_parms->server;
4041         struct cifs_tcon *tcon = io_parms->tcon;
4042
4043         /* we can only offload if we're connected */
4044         if (!server || !tcon)
4045                 return false;
4046
4047         /* we can only offload on an rdma connection */
4048         if (!server->rdma || !server->smbd_conn)
4049                 return false;
4050
4051         /* we don't support signed offload yet */
4052         if (server->sign)
4053                 return false;
4054
4055         /* we don't support encrypted offload yet */
4056         if (smb3_encryption_required(tcon))
4057                 return false;
4058
4059         /* offload also has its overhead, so only do it if desired */
4060         if (io_parms->length < server->smbd_conn->rdma_readwrite_threshold)
4061                 return false;
4062
4063         return true;
4064 }
4065 #endif /* CONFIG_CIFS_SMB_DIRECT */
4066
4067 /*
4068  * To form a chain of read requests, any read requests after the first should
4069  * have the end_of_chain boolean set to true.
4070  */
4071 static int
4072 smb2_new_read_req(void **buf, unsigned int *total_len,
4073         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
4074         unsigned int remaining_bytes, int request_type)
4075 {
4076         int rc = -EACCES;
4077         struct smb2_read_req *req = NULL;
4078         struct smb2_hdr *shdr;
4079         struct TCP_Server_Info *server = io_parms->server;
4080
4081         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, server,
4082                                  (void **) &req, total_len);
4083         if (rc)
4084                 return rc;
4085
4086         if (server == NULL)
4087                 return -ECONNABORTED;
4088
4089         shdr = &req->hdr;
4090         shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4091
4092         req->PersistentFileId = io_parms->persistent_fid;
4093         req->VolatileFileId = io_parms->volatile_fid;
4094         req->ReadChannelInfoOffset = 0; /* reserved */
4095         req->ReadChannelInfoLength = 0; /* reserved */
4096         req->Channel = 0; /* reserved */
4097         req->MinimumCount = 0;
4098         req->Length = cpu_to_le32(io_parms->length);
4099         req->Offset = cpu_to_le64(io_parms->offset);
4100
4101         trace_smb3_read_enter(0 /* xid */,
4102                         io_parms->persistent_fid,
4103                         io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4104                         io_parms->offset, io_parms->length);
4105 #ifdef CONFIG_CIFS_SMB_DIRECT
4106         /*
4107          * If we want to do a RDMA write, fill in and append
4108          * smbd_buffer_descriptor_v1 to the end of read request
4109          */
4110         if (smb3_use_rdma_offload(io_parms)) {
4111                 struct smbd_buffer_descriptor_v1 *v1;
4112                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4113
4114                 rdata->mr = smbd_register_mr(server->smbd_conn, &rdata->iter,
4115                                              true, need_invalidate);
4116                 if (!rdata->mr)
4117                         return -EAGAIN;
4118
4119                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4120                 if (need_invalidate)
4121                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4122                 req->ReadChannelInfoOffset =
4123                         cpu_to_le16(offsetof(struct smb2_read_req, Buffer));
4124                 req->ReadChannelInfoLength =
4125                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4126                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4127                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
4128                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
4129                 v1->length = cpu_to_le32(rdata->mr->mr->length);
4130
4131                 *total_len += sizeof(*v1) - 1;
4132         }
4133 #endif
4134         if (request_type & CHAINED_REQUEST) {
4135                 if (!(request_type & END_OF_CHAIN)) {
4136                         /* next 8-byte aligned request */
4137                         *total_len = ALIGN(*total_len, 8);
4138                         shdr->NextCommand = cpu_to_le32(*total_len);
4139                 } else /* END_OF_CHAIN */
4140                         shdr->NextCommand = 0;
4141                 if (request_type & RELATED_REQUEST) {
4142                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
4143                         /*
4144                          * Related requests use info from previous read request
4145                          * in chain.
4146                          */
4147                         shdr->SessionId = cpu_to_le64(0xFFFFFFFFFFFFFFFF);
4148                         shdr->Id.SyncId.TreeId = cpu_to_le32(0xFFFFFFFF);
4149                         req->PersistentFileId = (u64)-1;
4150                         req->VolatileFileId = (u64)-1;
4151                 }
4152         }
4153         if (remaining_bytes > io_parms->length)
4154                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
4155         else
4156                 req->RemainingBytes = 0;
4157
4158         *buf = req;
4159         return rc;
4160 }
4161
4162 static void
4163 smb2_readv_callback(struct mid_q_entry *mid)
4164 {
4165         struct cifs_readdata *rdata = mid->callback_data;
4166         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4167         struct TCP_Server_Info *server = rdata->server;
4168         struct smb2_hdr *shdr =
4169                                 (struct smb2_hdr *)rdata->iov[0].iov_base;
4170         struct cifs_credits credits = { .value = 0, .instance = 0 };
4171         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1], .rq_nvec = 1 };
4172
4173         if (rdata->got_bytes) {
4174                 rqst.rq_iter      = rdata->iter;
4175                 rqst.rq_iter_size = iov_iter_count(&rdata->iter);
4176         }
4177
4178         WARN_ONCE(rdata->server != mid->server,
4179                   "rdata server %p != mid server %p",
4180                   rdata->server, mid->server);
4181
4182         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
4183                  __func__, mid->mid, mid->mid_state, rdata->result,
4184                  rdata->bytes);
4185
4186         switch (mid->mid_state) {
4187         case MID_RESPONSE_RECEIVED:
4188                 credits.value = le16_to_cpu(shdr->CreditRequest);
4189                 credits.instance = server->reconnect_instance;
4190                 /* result already set, check signature */
4191                 if (server->sign && !mid->decrypted) {
4192                         int rc;
4193
4194                         iov_iter_revert(&rqst.rq_iter, rdata->got_bytes);
4195                         iov_iter_truncate(&rqst.rq_iter, rdata->got_bytes);
4196                         rc = smb2_verify_signature(&rqst, server);
4197                         if (rc)
4198                                 cifs_tcon_dbg(VFS, "SMB signature verification returned error = %d\n",
4199                                          rc);
4200                 }
4201                 /* FIXME: should this be counted toward the initiating task? */
4202                 task_io_account_read(rdata->got_bytes);
4203                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4204                 break;
4205         case MID_REQUEST_SUBMITTED:
4206         case MID_RETRY_NEEDED:
4207                 rdata->result = -EAGAIN;
4208                 if (server->sign && rdata->got_bytes)
4209                         /* reset bytes number since we can not check a sign */
4210                         rdata->got_bytes = 0;
4211                 /* FIXME: should this be counted toward the initiating task? */
4212                 task_io_account_read(rdata->got_bytes);
4213                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
4214                 break;
4215         case MID_RESPONSE_MALFORMED:
4216                 credits.value = le16_to_cpu(shdr->CreditRequest);
4217                 credits.instance = server->reconnect_instance;
4218                 fallthrough;
4219         default:
4220                 rdata->result = -EIO;
4221         }
4222 #ifdef CONFIG_CIFS_SMB_DIRECT
4223         /*
4224          * If this rdata has a memmory registered, the MR can be freed
4225          * MR needs to be freed as soon as I/O finishes to prevent deadlock
4226          * because they have limited number and are used for future I/Os
4227          */
4228         if (rdata->mr) {
4229                 smbd_deregister_mr(rdata->mr);
4230                 rdata->mr = NULL;
4231         }
4232 #endif
4233         if (rdata->result && rdata->result != -ENODATA) {
4234                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
4235                 trace_smb3_read_err(0 /* xid */,
4236                                     rdata->cfile->fid.persistent_fid,
4237                                     tcon->tid, tcon->ses->Suid, rdata->offset,
4238                                     rdata->bytes, rdata->result);
4239         } else
4240                 trace_smb3_read_done(0 /* xid */,
4241                                      rdata->cfile->fid.persistent_fid,
4242                                      tcon->tid, tcon->ses->Suid,
4243                                      rdata->offset, rdata->got_bytes);
4244
4245         queue_work(cifsiod_wq, &rdata->work);
4246         release_mid(mid);
4247         add_credits(server, &credits, 0);
4248 }
4249
4250 /* smb2_async_readv - send an async read, and set up mid to handle result */
4251 int
4252 smb2_async_readv(struct cifs_readdata *rdata)
4253 {
4254         int rc, flags = 0;
4255         char *buf;
4256         struct smb2_hdr *shdr;
4257         struct cifs_io_parms io_parms;
4258         struct smb_rqst rqst = { .rq_iov = rdata->iov,
4259                                  .rq_nvec = 1 };
4260         struct TCP_Server_Info *server;
4261         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
4262         unsigned int total_len;
4263         int credit_request;
4264
4265         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
4266                  __func__, rdata->offset, rdata->bytes);
4267
4268         if (!rdata->server)
4269                 rdata->server = cifs_pick_channel(tcon->ses);
4270
4271         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
4272         io_parms.server = server = rdata->server;
4273         io_parms.offset = rdata->offset;
4274         io_parms.length = rdata->bytes;
4275         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
4276         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
4277         io_parms.pid = rdata->pid;
4278
4279         rc = smb2_new_read_req(
4280                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
4281         if (rc)
4282                 return rc;
4283
4284         if (smb3_encryption_required(io_parms.tcon))
4285                 flags |= CIFS_TRANSFORM_REQ;
4286
4287         rdata->iov[0].iov_base = buf;
4288         rdata->iov[0].iov_len = total_len;
4289
4290         shdr = (struct smb2_hdr *)buf;
4291
4292         if (rdata->credits.value > 0) {
4293                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
4294                                                 SMB2_MAX_BUFFER_SIZE));
4295                 credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
4296                 if (server->credits >= server->max_credits)
4297                         shdr->CreditRequest = cpu_to_le16(0);
4298                 else
4299                         shdr->CreditRequest = cpu_to_le16(
4300                                 min_t(int, server->max_credits -
4301                                                 server->credits, credit_request));
4302
4303                 rc = adjust_credits(server, &rdata->credits, rdata->bytes);
4304                 if (rc)
4305                         goto async_readv_out;
4306
4307                 flags |= CIFS_HAS_CREDITS;
4308         }
4309
4310         kref_get(&rdata->refcount);
4311         rc = cifs_call_async(server, &rqst,
4312                              cifs_readv_receive, smb2_readv_callback,
4313                              smb3_handle_read_data, rdata, flags,
4314                              &rdata->credits);
4315         if (rc) {
4316                 kref_put(&rdata->refcount, cifs_readdata_release);
4317                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
4318                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
4319                                     io_parms.tcon->tid,
4320                                     io_parms.tcon->ses->Suid,
4321                                     io_parms.offset, io_parms.length, rc);
4322         }
4323
4324 async_readv_out:
4325         cifs_small_buf_release(buf);
4326         return rc;
4327 }
4328
4329 int
4330 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
4331           unsigned int *nbytes, char **buf, int *buf_type)
4332 {
4333         struct smb_rqst rqst;
4334         int resp_buftype, rc;
4335         struct smb2_read_req *req = NULL;
4336         struct smb2_read_rsp *rsp = NULL;
4337         struct kvec iov[1];
4338         struct kvec rsp_iov;
4339         unsigned int total_len;
4340         int flags = CIFS_LOG_ERROR;
4341         struct cifs_ses *ses = io_parms->tcon->ses;
4342
4343         if (!io_parms->server)
4344                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4345
4346         *nbytes = 0;
4347         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
4348         if (rc)
4349                 return rc;
4350
4351         if (smb3_encryption_required(io_parms->tcon))
4352                 flags |= CIFS_TRANSFORM_REQ;
4353
4354         iov[0].iov_base = (char *)req;
4355         iov[0].iov_len = total_len;
4356
4357         memset(&rqst, 0, sizeof(struct smb_rqst));
4358         rqst.rq_iov = iov;
4359         rqst.rq_nvec = 1;
4360
4361         rc = cifs_send_recv(xid, ses, io_parms->server,
4362                             &rqst, &resp_buftype, flags, &rsp_iov);
4363         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
4364
4365         if (rc) {
4366                 if (rc != -ENODATA) {
4367                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
4368                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
4369                         trace_smb3_read_err(xid,
4370                                             req->PersistentFileId,
4371                                             io_parms->tcon->tid, ses->Suid,
4372                                             io_parms->offset, io_parms->length,
4373                                             rc);
4374                 } else
4375                         trace_smb3_read_done(xid, req->PersistentFileId, io_parms->tcon->tid,
4376                                              ses->Suid, io_parms->offset, 0);
4377                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4378                 cifs_small_buf_release(req);
4379                 return rc == -ENODATA ? 0 : rc;
4380         } else
4381                 trace_smb3_read_done(xid,
4382                                     req->PersistentFileId,
4383                                     io_parms->tcon->tid, ses->Suid,
4384                                     io_parms->offset, io_parms->length);
4385
4386         cifs_small_buf_release(req);
4387
4388         *nbytes = le32_to_cpu(rsp->DataLength);
4389         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
4390             (*nbytes > io_parms->length)) {
4391                 cifs_dbg(FYI, "bad length %d for count %d\n",
4392                          *nbytes, io_parms->length);
4393                 rc = -EIO;
4394                 *nbytes = 0;
4395         }
4396
4397         if (*buf) {
4398                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
4399                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4400         } else if (resp_buftype != CIFS_NO_BUFFER) {
4401                 *buf = rsp_iov.iov_base;
4402                 if (resp_buftype == CIFS_SMALL_BUFFER)
4403                         *buf_type = CIFS_SMALL_BUFFER;
4404                 else if (resp_buftype == CIFS_LARGE_BUFFER)
4405                         *buf_type = CIFS_LARGE_BUFFER;
4406         }
4407         return rc;
4408 }
4409
4410 /*
4411  * Check the mid_state and signature on received buffer (if any), and queue the
4412  * workqueue completion task.
4413  */
4414 static void
4415 smb2_writev_callback(struct mid_q_entry *mid)
4416 {
4417         struct cifs_writedata *wdata = mid->callback_data;
4418         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4419         struct TCP_Server_Info *server = wdata->server;
4420         unsigned int written;
4421         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
4422         struct cifs_credits credits = { .value = 0, .instance = 0 };
4423
4424         WARN_ONCE(wdata->server != mid->server,
4425                   "wdata server %p != mid server %p",
4426                   wdata->server, mid->server);
4427
4428         switch (mid->mid_state) {
4429         case MID_RESPONSE_RECEIVED:
4430                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4431                 credits.instance = server->reconnect_instance;
4432                 wdata->result = smb2_check_receive(mid, server, 0);
4433                 if (wdata->result != 0)
4434                         break;
4435
4436                 written = le32_to_cpu(rsp->DataLength);
4437                 /*
4438                  * Mask off high 16 bits when bytes written as returned
4439                  * by the server is greater than bytes requested by the
4440                  * client. OS/2 servers are known to set incorrect
4441                  * CountHigh values.
4442                  */
4443                 if (written > wdata->bytes)
4444                         written &= 0xFFFF;
4445
4446                 if (written < wdata->bytes)
4447                         wdata->result = -ENOSPC;
4448                 else
4449                         wdata->bytes = written;
4450                 break;
4451         case MID_REQUEST_SUBMITTED:
4452         case MID_RETRY_NEEDED:
4453                 wdata->result = -EAGAIN;
4454                 break;
4455         case MID_RESPONSE_MALFORMED:
4456                 credits.value = le16_to_cpu(rsp->hdr.CreditRequest);
4457                 credits.instance = server->reconnect_instance;
4458                 fallthrough;
4459         default:
4460                 wdata->result = -EIO;
4461                 break;
4462         }
4463 #ifdef CONFIG_CIFS_SMB_DIRECT
4464         /*
4465          * If this wdata has a memory registered, the MR can be freed
4466          * The number of MRs available is limited, it's important to recover
4467          * used MR as soon as I/O is finished. Hold MR longer in the later
4468          * I/O process can possibly result in I/O deadlock due to lack of MR
4469          * to send request on I/O retry
4470          */
4471         if (wdata->mr) {
4472                 smbd_deregister_mr(wdata->mr);
4473                 wdata->mr = NULL;
4474         }
4475 #endif
4476         if (wdata->result) {
4477                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4478                 trace_smb3_write_err(0 /* no xid */,
4479                                      wdata->cfile->fid.persistent_fid,
4480                                      tcon->tid, tcon->ses->Suid, wdata->offset,
4481                                      wdata->bytes, wdata->result);
4482                 if (wdata->result == -ENOSPC)
4483                         pr_warn_once("Out of space writing to %s\n",
4484                                      tcon->tree_name);
4485         } else
4486                 trace_smb3_write_done(0 /* no xid */,
4487                                       wdata->cfile->fid.persistent_fid,
4488                                       tcon->tid, tcon->ses->Suid,
4489                                       wdata->offset, wdata->bytes);
4490
4491         queue_work(cifsiod_wq, &wdata->work);
4492         release_mid(mid);
4493         add_credits(server, &credits, 0);
4494 }
4495
4496 /* smb2_async_writev - send an async write, and set up mid to handle result */
4497 int
4498 smb2_async_writev(struct cifs_writedata *wdata,
4499                   void (*release)(struct kref *kref))
4500 {
4501         int rc = -EACCES, flags = 0;
4502         struct smb2_write_req *req = NULL;
4503         struct smb2_hdr *shdr;
4504         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
4505         struct TCP_Server_Info *server = wdata->server;
4506         struct kvec iov[1];
4507         struct smb_rqst rqst = { };
4508         unsigned int total_len;
4509         struct cifs_io_parms _io_parms;
4510         struct cifs_io_parms *io_parms = NULL;
4511         int credit_request;
4512
4513         if (!wdata->server)
4514                 server = wdata->server = cifs_pick_channel(tcon->ses);
4515
4516         /*
4517          * in future we may get cifs_io_parms passed in from the caller,
4518          * but for now we construct it here...
4519          */
4520         _io_parms = (struct cifs_io_parms) {
4521                 .tcon = tcon,
4522                 .server = server,
4523                 .offset = wdata->offset,
4524                 .length = wdata->bytes,
4525                 .persistent_fid = wdata->cfile->fid.persistent_fid,
4526                 .volatile_fid = wdata->cfile->fid.volatile_fid,
4527                 .pid = wdata->pid,
4528         };
4529         io_parms = &_io_parms;
4530
4531         rc = smb2_plain_req_init(SMB2_WRITE, tcon, server,
4532                                  (void **) &req, &total_len);
4533         if (rc)
4534                 return rc;
4535
4536         if (smb3_encryption_required(tcon))
4537                 flags |= CIFS_TRANSFORM_REQ;
4538
4539         shdr = (struct smb2_hdr *)req;
4540         shdr->Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4541
4542         req->PersistentFileId = io_parms->persistent_fid;
4543         req->VolatileFileId = io_parms->volatile_fid;
4544         req->WriteChannelInfoOffset = 0;
4545         req->WriteChannelInfoLength = 0;
4546         req->Channel = SMB2_CHANNEL_NONE;
4547         req->Offset = cpu_to_le64(io_parms->offset);
4548         req->DataOffset = cpu_to_le16(
4549                                 offsetof(struct smb2_write_req, Buffer));
4550         req->RemainingBytes = 0;
4551
4552         trace_smb3_write_enter(0 /* xid */,
4553                                io_parms->persistent_fid,
4554                                io_parms->tcon->tid,
4555                                io_parms->tcon->ses->Suid,
4556                                io_parms->offset,
4557                                io_parms->length);
4558
4559 #ifdef CONFIG_CIFS_SMB_DIRECT
4560         /*
4561          * If we want to do a server RDMA read, fill in and append
4562          * smbd_buffer_descriptor_v1 to the end of write request
4563          */
4564         if (smb3_use_rdma_offload(io_parms)) {
4565                 struct smbd_buffer_descriptor_v1 *v1;
4566                 size_t data_size = iov_iter_count(&wdata->iter);
4567                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
4568
4569                 wdata->mr = smbd_register_mr(server->smbd_conn, &wdata->iter,
4570                                              false, need_invalidate);
4571                 if (!wdata->mr) {
4572                         rc = -EAGAIN;
4573                         goto async_writev_out;
4574                 }
4575                 req->Length = 0;
4576                 req->DataOffset = 0;
4577                 req->RemainingBytes = cpu_to_le32(data_size);
4578                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
4579                 if (need_invalidate)
4580                         req->Channel = SMB2_CHANNEL_RDMA_V1;
4581                 req->WriteChannelInfoOffset =
4582                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
4583                 req->WriteChannelInfoLength =
4584                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
4585                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
4586                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
4587                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
4588                 v1->length = cpu_to_le32(wdata->mr->mr->length);
4589         }
4590 #endif
4591         iov[0].iov_len = total_len - 1;
4592         iov[0].iov_base = (char *)req;
4593
4594         rqst.rq_iov = iov;
4595         rqst.rq_nvec = 1;
4596         rqst.rq_iter = wdata->iter;
4597         rqst.rq_iter_size = iov_iter_count(&rqst.rq_iter);
4598 #ifdef CONFIG_CIFS_SMB_DIRECT
4599         if (wdata->mr)
4600                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
4601 #endif
4602         cifs_dbg(FYI, "async write at %llu %u bytes iter=%zx\n",
4603                  io_parms->offset, io_parms->length, iov_iter_count(&rqst.rq_iter));
4604
4605 #ifdef CONFIG_CIFS_SMB_DIRECT
4606         /* For RDMA read, I/O size is in RemainingBytes not in Length */
4607         if (!wdata->mr)
4608                 req->Length = cpu_to_le32(io_parms->length);
4609 #else
4610         req->Length = cpu_to_le32(io_parms->length);
4611 #endif
4612
4613         if (wdata->credits.value > 0) {
4614                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
4615                                                     SMB2_MAX_BUFFER_SIZE));
4616                 credit_request = le16_to_cpu(shdr->CreditCharge) + 8;
4617                 if (server->credits >= server->max_credits)
4618                         shdr->CreditRequest = cpu_to_le16(0);
4619                 else
4620                         shdr->CreditRequest = cpu_to_le16(
4621                                 min_t(int, server->max_credits -
4622                                                 server->credits, credit_request));
4623
4624                 rc = adjust_credits(server, &wdata->credits, io_parms->length);
4625                 if (rc)
4626                         goto async_writev_out;
4627
4628                 flags |= CIFS_HAS_CREDITS;
4629         }
4630
4631         kref_get(&wdata->refcount);
4632         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
4633                              wdata, flags, &wdata->credits);
4634
4635         if (rc) {
4636                 trace_smb3_write_err(0 /* no xid */,
4637                                      io_parms->persistent_fid,
4638                                      io_parms->tcon->tid,
4639                                      io_parms->tcon->ses->Suid,
4640                                      io_parms->offset,
4641                                      io_parms->length,
4642                                      rc);
4643                 kref_put(&wdata->refcount, release);
4644                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
4645         }
4646
4647 async_writev_out:
4648         cifs_small_buf_release(req);
4649         return rc;
4650 }
4651
4652 /*
4653  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
4654  * The length field from io_parms must be at least 1 and indicates a number of
4655  * elements with data to write that begins with position 1 in iov array. All
4656  * data length is specified by count.
4657  */
4658 int
4659 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
4660            unsigned int *nbytes, struct kvec *iov, int n_vec)
4661 {
4662         struct smb_rqst rqst;
4663         int rc = 0;
4664         struct smb2_write_req *req = NULL;
4665         struct smb2_write_rsp *rsp = NULL;
4666         int resp_buftype;
4667         struct kvec rsp_iov;
4668         int flags = 0;
4669         unsigned int total_len;
4670         struct TCP_Server_Info *server;
4671
4672         *nbytes = 0;
4673
4674         if (n_vec < 1)
4675                 return rc;
4676
4677         if (!io_parms->server)
4678                 io_parms->server = cifs_pick_channel(io_parms->tcon->ses);
4679         server = io_parms->server;
4680         if (server == NULL)
4681                 return -ECONNABORTED;
4682
4683         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, server,
4684                                  (void **) &req, &total_len);
4685         if (rc)
4686                 return rc;
4687
4688         if (smb3_encryption_required(io_parms->tcon))
4689                 flags |= CIFS_TRANSFORM_REQ;
4690
4691         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(io_parms->pid);
4692
4693         req->PersistentFileId = io_parms->persistent_fid;
4694         req->VolatileFileId = io_parms->volatile_fid;
4695         req->WriteChannelInfoOffset = 0;
4696         req->WriteChannelInfoLength = 0;
4697         req->Channel = 0;
4698         req->Length = cpu_to_le32(io_parms->length);
4699         req->Offset = cpu_to_le64(io_parms->offset);
4700         req->DataOffset = cpu_to_le16(
4701                                 offsetof(struct smb2_write_req, Buffer));
4702         req->RemainingBytes = 0;
4703
4704         trace_smb3_write_enter(xid, io_parms->persistent_fid,
4705                 io_parms->tcon->tid, io_parms->tcon->ses->Suid,
4706                 io_parms->offset, io_parms->length);
4707
4708         iov[0].iov_base = (char *)req;
4709         /* 1 for Buffer */
4710         iov[0].iov_len = total_len - 1;
4711
4712         memset(&rqst, 0, sizeof(struct smb_rqst));
4713         rqst.rq_iov = iov;
4714         rqst.rq_nvec = n_vec + 1;
4715
4716         rc = cifs_send_recv(xid, io_parms->tcon->ses, server,
4717                             &rqst,
4718                             &resp_buftype, flags, &rsp_iov);
4719         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
4720
4721         if (rc) {
4722                 trace_smb3_write_err(xid,
4723                                      req->PersistentFileId,
4724                                      io_parms->tcon->tid,
4725                                      io_parms->tcon->ses->Suid,
4726                                      io_parms->offset, io_parms->length, rc);
4727                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
4728                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
4729         } else {
4730                 *nbytes = le32_to_cpu(rsp->DataLength);
4731                 trace_smb3_write_done(xid,
4732                                       req->PersistentFileId,
4733                                       io_parms->tcon->tid,
4734                                       io_parms->tcon->ses->Suid,
4735                                       io_parms->offset, *nbytes);
4736         }
4737
4738         cifs_small_buf_release(req);
4739         free_rsp_buf(resp_buftype, rsp);
4740         return rc;
4741 }
4742
4743 int posix_info_sid_size(const void *beg, const void *end)
4744 {
4745         size_t subauth;
4746         int total;
4747
4748         if (beg + 1 > end)
4749                 return -1;
4750
4751         subauth = *(u8 *)(beg+1);
4752         if (subauth < 1 || subauth > 15)
4753                 return -1;
4754
4755         total = 1 + 1 + 6 + 4*subauth;
4756         if (beg + total > end)
4757                 return -1;
4758
4759         return total;
4760 }
4761
4762 int posix_info_parse(const void *beg, const void *end,
4763                      struct smb2_posix_info_parsed *out)
4764
4765 {
4766         int total_len = 0;
4767         int owner_len, group_len;
4768         int name_len;
4769         const void *owner_sid;
4770         const void *group_sid;
4771         const void *name;
4772
4773         /* if no end bound given, assume payload to be correct */
4774         if (!end) {
4775                 const struct smb2_posix_info *p = beg;
4776
4777                 end = beg + le32_to_cpu(p->NextEntryOffset);
4778                 /* last element will have a 0 offset, pick a sensible bound */
4779                 if (end == beg)
4780                         end += 0xFFFF;
4781         }
4782
4783         /* check base buf */
4784         if (beg + sizeof(struct smb2_posix_info) > end)
4785                 return -1;
4786         total_len = sizeof(struct smb2_posix_info);
4787
4788         /* check owner sid */
4789         owner_sid = beg + total_len;
4790         owner_len = posix_info_sid_size(owner_sid, end);
4791         if (owner_len < 0)
4792                 return -1;
4793         total_len += owner_len;
4794
4795         /* check group sid */
4796         group_sid = beg + total_len;
4797         group_len = posix_info_sid_size(group_sid, end);
4798         if (group_len < 0)
4799                 return -1;
4800         total_len += group_len;
4801
4802         /* check name len */
4803         if (beg + total_len + 4 > end)
4804                 return -1;
4805         name_len = le32_to_cpu(*(__le32 *)(beg + total_len));
4806         if (name_len < 1 || name_len > 0xFFFF)
4807                 return -1;
4808         total_len += 4;
4809
4810         /* check name */
4811         name = beg + total_len;
4812         if (name + name_len > end)
4813                 return -1;
4814         total_len += name_len;
4815
4816         if (out) {
4817                 out->base = beg;
4818                 out->size = total_len;
4819                 out->name_len = name_len;
4820                 out->name = name;
4821                 memcpy(&out->owner, owner_sid, owner_len);
4822                 memcpy(&out->group, group_sid, group_len);
4823         }
4824         return total_len;
4825 }
4826
4827 static int posix_info_extra_size(const void *beg, const void *end)
4828 {
4829         int len = posix_info_parse(beg, end, NULL);
4830
4831         if (len < 0)
4832                 return -1;
4833         return len - sizeof(struct smb2_posix_info);
4834 }
4835
4836 static unsigned int
4837 num_entries(int infotype, char *bufstart, char *end_of_buf, char **lastentry,
4838             size_t size)
4839 {
4840         int len;
4841         unsigned int entrycount = 0;
4842         unsigned int next_offset = 0;
4843         char *entryptr;
4844         FILE_DIRECTORY_INFO *dir_info;
4845
4846         if (bufstart == NULL)
4847                 return 0;
4848
4849         entryptr = bufstart;
4850
4851         while (1) {
4852                 if (entryptr + next_offset < entryptr ||
4853                     entryptr + next_offset > end_of_buf ||
4854                     entryptr + next_offset + size > end_of_buf) {
4855                         cifs_dbg(VFS, "malformed search entry would overflow\n");
4856                         break;
4857                 }
4858
4859                 entryptr = entryptr + next_offset;
4860                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
4861
4862                 if (infotype == SMB_FIND_FILE_POSIX_INFO)
4863                         len = posix_info_extra_size(entryptr, end_of_buf);
4864                 else
4865                         len = le32_to_cpu(dir_info->FileNameLength);
4866
4867                 if (len < 0 ||
4868                     entryptr + len < entryptr ||
4869                     entryptr + len > end_of_buf ||
4870                     entryptr + len + size > end_of_buf) {
4871                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
4872                                  end_of_buf);
4873                         break;
4874                 }
4875
4876                 *lastentry = entryptr;
4877                 entrycount++;
4878
4879                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
4880                 if (!next_offset)
4881                         break;
4882         }
4883
4884         return entrycount;
4885 }
4886
4887 /*
4888  * Readdir/FindFirst
4889  */
4890 int SMB2_query_directory_init(const unsigned int xid,
4891                               struct cifs_tcon *tcon,
4892                               struct TCP_Server_Info *server,
4893                               struct smb_rqst *rqst,
4894                               u64 persistent_fid, u64 volatile_fid,
4895                               int index, int info_level)
4896 {
4897         struct smb2_query_directory_req *req;
4898         unsigned char *bufptr;
4899         __le16 asteriks = cpu_to_le16('*');
4900         unsigned int output_size = CIFSMaxBufSize -
4901                 MAX_SMB2_CREATE_RESPONSE_SIZE -
4902                 MAX_SMB2_CLOSE_RESPONSE_SIZE;
4903         unsigned int total_len;
4904         struct kvec *iov = rqst->rq_iov;
4905         int len, rc;
4906
4907         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, server,
4908                                  (void **) &req, &total_len);
4909         if (rc)
4910                 return rc;
4911
4912         switch (info_level) {
4913         case SMB_FIND_FILE_DIRECTORY_INFO:
4914                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
4915                 break;
4916         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4917                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
4918                 break;
4919         case SMB_FIND_FILE_POSIX_INFO:
4920                 req->FileInformationClass = SMB_FIND_FILE_POSIX_INFO;
4921                 break;
4922         default:
4923                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4924                         info_level);
4925                 return -EINVAL;
4926         }
4927
4928         req->FileIndex = cpu_to_le32(index);
4929         req->PersistentFileId = persistent_fid;
4930         req->VolatileFileId = volatile_fid;
4931
4932         len = 0x2;
4933         bufptr = req->Buffer;
4934         memcpy(bufptr, &asteriks, len);
4935
4936         req->FileNameOffset =
4937                 cpu_to_le16(sizeof(struct smb2_query_directory_req));
4938         req->FileNameLength = cpu_to_le16(len);
4939         /*
4940          * BB could be 30 bytes or so longer if we used SMB2 specific
4941          * buffer lengths, but this is safe and close enough.
4942          */
4943         output_size = min_t(unsigned int, output_size, server->maxBuf);
4944         output_size = min_t(unsigned int, output_size, 2 << 15);
4945         req->OutputBufferLength = cpu_to_le32(output_size);
4946
4947         iov[0].iov_base = (char *)req;
4948         /* 1 for Buffer */
4949         iov[0].iov_len = total_len - 1;
4950
4951         iov[1].iov_base = (char *)(req->Buffer);
4952         iov[1].iov_len = len;
4953
4954         trace_smb3_query_dir_enter(xid, persistent_fid, tcon->tid,
4955                         tcon->ses->Suid, index, output_size);
4956
4957         return 0;
4958 }
4959
4960 void SMB2_query_directory_free(struct smb_rqst *rqst)
4961 {
4962         if (rqst && rqst->rq_iov) {
4963                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
4964         }
4965 }
4966
4967 int
4968 smb2_parse_query_directory(struct cifs_tcon *tcon,
4969                            struct kvec *rsp_iov,
4970                            int resp_buftype,
4971                            struct cifs_search_info *srch_inf)
4972 {
4973         struct smb2_query_directory_rsp *rsp;
4974         size_t info_buf_size;
4975         char *end_of_smb;
4976         int rc;
4977
4978         rsp = (struct smb2_query_directory_rsp *)rsp_iov->iov_base;
4979
4980         switch (srch_inf->info_level) {
4981         case SMB_FIND_FILE_DIRECTORY_INFO:
4982                 info_buf_size = sizeof(FILE_DIRECTORY_INFO);
4983                 break;
4984         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
4985                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO);
4986                 break;
4987         case SMB_FIND_FILE_POSIX_INFO:
4988                 /* note that posix payload are variable size */
4989                 info_buf_size = sizeof(struct smb2_posix_info);
4990                 break;
4991         default:
4992                 cifs_tcon_dbg(VFS, "info level %u isn't supported\n",
4993                          srch_inf->info_level);
4994                 return -EINVAL;
4995         }
4996
4997         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4998                                le32_to_cpu(rsp->OutputBufferLength), rsp_iov,
4999                                info_buf_size);
5000         if (rc) {
5001                 cifs_tcon_dbg(VFS, "bad info payload");
5002                 return rc;
5003         }
5004
5005         srch_inf->unicode = true;
5006
5007         if (srch_inf->ntwrk_buf_start) {
5008                 if (srch_inf->smallBuf)
5009                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
5010                 else
5011                         cifs_buf_release(srch_inf->ntwrk_buf_start);
5012         }
5013         srch_inf->ntwrk_buf_start = (char *)rsp;
5014         srch_inf->srch_entries_start = srch_inf->last_entry =
5015                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
5016         end_of_smb = rsp_iov->iov_len + (char *)rsp;
5017
5018         srch_inf->entries_in_buffer = num_entries(
5019                 srch_inf->info_level,
5020                 srch_inf->srch_entries_start,
5021                 end_of_smb,
5022                 &srch_inf->last_entry,
5023                 info_buf_size);
5024
5025         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
5026         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
5027                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
5028                  srch_inf->srch_entries_start, srch_inf->last_entry);
5029         if (resp_buftype == CIFS_LARGE_BUFFER)
5030                 srch_inf->smallBuf = false;
5031         else if (resp_buftype == CIFS_SMALL_BUFFER)
5032                 srch_inf->smallBuf = true;
5033         else
5034                 cifs_tcon_dbg(VFS, "Invalid search buffer type\n");
5035
5036         return 0;
5037 }
5038
5039 int
5040 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
5041                      u64 persistent_fid, u64 volatile_fid, int index,
5042                      struct cifs_search_info *srch_inf)
5043 {
5044         struct smb_rqst rqst;
5045         struct kvec iov[SMB2_QUERY_DIRECTORY_IOV_SIZE];
5046         struct smb2_query_directory_rsp *rsp = NULL;
5047         int resp_buftype = CIFS_NO_BUFFER;
5048         struct kvec rsp_iov;
5049         int rc = 0;
5050         struct cifs_ses *ses = tcon->ses;
5051         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5052         int flags = 0;
5053
5054         if (!ses || !(ses->server))
5055                 return -EIO;
5056
5057         if (smb3_encryption_required(tcon))
5058                 flags |= CIFS_TRANSFORM_REQ;
5059
5060         memset(&rqst, 0, sizeof(struct smb_rqst));
5061         memset(&iov, 0, sizeof(iov));
5062         rqst.rq_iov = iov;
5063         rqst.rq_nvec = SMB2_QUERY_DIRECTORY_IOV_SIZE;
5064
5065         rc = SMB2_query_directory_init(xid, tcon, server,
5066                                        &rqst, persistent_fid,
5067                                        volatile_fid, index,
5068                                        srch_inf->info_level);
5069         if (rc)
5070                 goto qdir_exit;
5071
5072         rc = cifs_send_recv(xid, ses, server,
5073                             &rqst, &resp_buftype, flags, &rsp_iov);
5074         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
5075
5076         if (rc) {
5077                 if (rc == -ENODATA &&
5078                     rsp->hdr.Status == STATUS_NO_MORE_FILES) {
5079                         trace_smb3_query_dir_done(xid, persistent_fid,
5080                                 tcon->tid, tcon->ses->Suid, index, 0);
5081                         srch_inf->endOfSearch = true;
5082                         rc = 0;
5083                 } else {
5084                         trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5085                                 tcon->ses->Suid, index, 0, rc);
5086                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
5087                 }
5088                 goto qdir_exit;
5089         }
5090
5091         rc = smb2_parse_query_directory(tcon, &rsp_iov, resp_buftype,
5092                                         srch_inf);
5093         if (rc) {
5094                 trace_smb3_query_dir_err(xid, persistent_fid, tcon->tid,
5095                         tcon->ses->Suid, index, 0, rc);
5096                 goto qdir_exit;
5097         }
5098         resp_buftype = CIFS_NO_BUFFER;
5099
5100         trace_smb3_query_dir_done(xid, persistent_fid, tcon->tid,
5101                         tcon->ses->Suid, index, srch_inf->entries_in_buffer);
5102
5103 qdir_exit:
5104         SMB2_query_directory_free(&rqst);
5105         free_rsp_buf(resp_buftype, rsp);
5106         return rc;
5107 }
5108
5109 int
5110 SMB2_set_info_init(struct cifs_tcon *tcon, struct TCP_Server_Info *server,
5111                    struct smb_rqst *rqst,
5112                    u64 persistent_fid, u64 volatile_fid, u32 pid,
5113                    u8 info_class, u8 info_type, u32 additional_info,
5114                    void **data, unsigned int *size)
5115 {
5116         struct smb2_set_info_req *req;
5117         struct kvec *iov = rqst->rq_iov;
5118         unsigned int i, total_len;
5119         int rc;
5120
5121         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, server,
5122                                  (void **) &req, &total_len);
5123         if (rc)
5124                 return rc;
5125
5126         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
5127         req->InfoType = info_type;
5128         req->FileInfoClass = info_class;
5129         req->PersistentFileId = persistent_fid;
5130         req->VolatileFileId = volatile_fid;
5131         req->AdditionalInformation = cpu_to_le32(additional_info);
5132
5133         req->BufferOffset = cpu_to_le16(sizeof(struct smb2_set_info_req));
5134         req->BufferLength = cpu_to_le32(*size);
5135
5136         memcpy(req->Buffer, *data, *size);
5137         total_len += *size;
5138
5139         iov[0].iov_base = (char *)req;
5140         /* 1 for Buffer */
5141         iov[0].iov_len = total_len - 1;
5142
5143         for (i = 1; i < rqst->rq_nvec; i++) {
5144                 le32_add_cpu(&req->BufferLength, size[i]);
5145                 iov[i].iov_base = (char *)data[i];
5146                 iov[i].iov_len = size[i];
5147         }
5148
5149         return 0;
5150 }
5151
5152 void
5153 SMB2_set_info_free(struct smb_rqst *rqst)
5154 {
5155         if (rqst && rqst->rq_iov)
5156                 cifs_buf_release(rqst->rq_iov[0].iov_base); /* request */
5157 }
5158
5159 static int
5160 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
5161                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
5162                u8 info_type, u32 additional_info, unsigned int num,
5163                 void **data, unsigned int *size)
5164 {
5165         struct smb_rqst rqst;
5166         struct smb2_set_info_rsp *rsp = NULL;
5167         struct kvec *iov;
5168         struct kvec rsp_iov;
5169         int rc = 0;
5170         int resp_buftype;
5171         struct cifs_ses *ses = tcon->ses;
5172         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5173         int flags = 0;
5174
5175         if (!ses || !server)
5176                 return -EIO;
5177
5178         if (!num)
5179                 return -EINVAL;
5180
5181         if (smb3_encryption_required(tcon))
5182                 flags |= CIFS_TRANSFORM_REQ;
5183
5184         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
5185         if (!iov)
5186                 return -ENOMEM;
5187
5188         memset(&rqst, 0, sizeof(struct smb_rqst));
5189         rqst.rq_iov = iov;
5190         rqst.rq_nvec = num;
5191
5192         rc = SMB2_set_info_init(tcon, server,
5193                                 &rqst, persistent_fid, volatile_fid, pid,
5194                                 info_class, info_type, additional_info,
5195                                 data, size);
5196         if (rc) {
5197                 kfree(iov);
5198                 return rc;
5199         }
5200
5201
5202         rc = cifs_send_recv(xid, ses, server,
5203                             &rqst, &resp_buftype, flags,
5204                             &rsp_iov);
5205         SMB2_set_info_free(&rqst);
5206         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
5207
5208         if (rc != 0) {
5209                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
5210                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
5211                                 ses->Suid, info_class, (__u32)info_type, rc);
5212         }
5213
5214         free_rsp_buf(resp_buftype, rsp);
5215         kfree(iov);
5216         return rc;
5217 }
5218
5219 int
5220 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
5221              u64 volatile_fid, u32 pid, __le64 *eof)
5222 {
5223         struct smb2_file_eof_info info;
5224         void *data;
5225         unsigned int size;
5226
5227         info.EndOfFile = *eof;
5228
5229         data = &info;
5230         size = sizeof(struct smb2_file_eof_info);
5231
5232         trace_smb3_set_eof(xid, persistent_fid, tcon->tid, tcon->ses->Suid, le64_to_cpu(*eof));
5233
5234         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5235                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
5236                         0, 1, &data, &size);
5237 }
5238
5239 int
5240 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
5241                 u64 persistent_fid, u64 volatile_fid,
5242                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
5243 {
5244         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5245                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
5246                         1, (void **)&pnntsd, &pacllen);
5247 }
5248
5249 int
5250 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
5251             u64 persistent_fid, u64 volatile_fid,
5252             struct smb2_file_full_ea_info *buf, int len)
5253 {
5254         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
5255                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
5256                 0, 1, (void **)&buf, &len);
5257 }
5258
5259 int
5260 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
5261                   const u64 persistent_fid, const u64 volatile_fid,
5262                   __u8 oplock_level)
5263 {
5264         struct smb_rqst rqst;
5265         int rc;
5266         struct smb2_oplock_break *req = NULL;
5267         struct cifs_ses *ses = tcon->ses;
5268         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5269         int flags = CIFS_OBREAK_OP;
5270         unsigned int total_len;
5271         struct kvec iov[1];
5272         struct kvec rsp_iov;
5273         int resp_buf_type;
5274
5275         cifs_dbg(FYI, "SMB2_oplock_break\n");
5276         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5277                                  (void **) &req, &total_len);
5278         if (rc)
5279                 return rc;
5280
5281         if (smb3_encryption_required(tcon))
5282                 flags |= CIFS_TRANSFORM_REQ;
5283
5284         req->VolatileFid = volatile_fid;
5285         req->PersistentFid = persistent_fid;
5286         req->OplockLevel = oplock_level;
5287         req->hdr.CreditRequest = cpu_to_le16(1);
5288
5289         flags |= CIFS_NO_RSP_BUF;
5290
5291         iov[0].iov_base = (char *)req;
5292         iov[0].iov_len = total_len;
5293
5294         memset(&rqst, 0, sizeof(struct smb_rqst));
5295         rqst.rq_iov = iov;
5296         rqst.rq_nvec = 1;
5297
5298         rc = cifs_send_recv(xid, ses, server,
5299                             &rqst, &resp_buf_type, flags, &rsp_iov);
5300         cifs_small_buf_release(req);
5301
5302         if (rc) {
5303                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5304                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
5305         }
5306
5307         return rc;
5308 }
5309
5310 void
5311 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
5312                              struct kstatfs *kst)
5313 {
5314         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
5315                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
5316         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
5317         kst->f_bfree  = kst->f_bavail =
5318                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
5319         return;
5320 }
5321
5322 static void
5323 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
5324                         struct kstatfs *kst)
5325 {
5326         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
5327         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
5328         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
5329         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
5330                 kst->f_bavail = kst->f_bfree;
5331         else
5332                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
5333         if (response_data->TotalFileNodes != cpu_to_le64(-1))
5334                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
5335         if (response_data->FreeFileNodes != cpu_to_le64(-1))
5336                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
5337
5338         return;
5339 }
5340
5341 static int
5342 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon,
5343                    struct TCP_Server_Info *server,
5344                    int level, int outbuf_len, u64 persistent_fid,
5345                    u64 volatile_fid)
5346 {
5347         int rc;
5348         struct smb2_query_info_req *req;
5349         unsigned int total_len;
5350
5351         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
5352
5353         if ((tcon->ses == NULL) || server == NULL)
5354                 return -EIO;
5355
5356         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, server,
5357                                  (void **) &req, &total_len);
5358         if (rc)
5359                 return rc;
5360
5361         req->InfoType = SMB2_O_INFO_FILESYSTEM;
5362         req->FileInfoClass = level;
5363         req->PersistentFileId = persistent_fid;
5364         req->VolatileFileId = volatile_fid;
5365         /* 1 for pad */
5366         req->InputBufferOffset =
5367                         cpu_to_le16(sizeof(struct smb2_query_info_req));
5368         req->OutputBufferLength = cpu_to_le32(
5369                 outbuf_len + sizeof(struct smb2_query_info_rsp));
5370
5371         iov->iov_base = (char *)req;
5372         iov->iov_len = total_len;
5373         return 0;
5374 }
5375
5376 int
5377 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
5378               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5379 {
5380         struct smb_rqst rqst;
5381         struct smb2_query_info_rsp *rsp = NULL;
5382         struct kvec iov;
5383         struct kvec rsp_iov;
5384         int rc = 0;
5385         int resp_buftype;
5386         struct cifs_ses *ses = tcon->ses;
5387         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5388         FILE_SYSTEM_POSIX_INFO *info = NULL;
5389         int flags = 0;
5390
5391         rc = build_qfs_info_req(&iov, tcon, server,
5392                                 FS_POSIX_INFORMATION,
5393                                 sizeof(FILE_SYSTEM_POSIX_INFO),
5394                                 persistent_fid, volatile_fid);
5395         if (rc)
5396                 return rc;
5397
5398         if (smb3_encryption_required(tcon))
5399                 flags |= CIFS_TRANSFORM_REQ;
5400
5401         memset(&rqst, 0, sizeof(struct smb_rqst));
5402         rqst.rq_iov = &iov;
5403         rqst.rq_nvec = 1;
5404
5405         rc = cifs_send_recv(xid, ses, server,
5406                             &rqst, &resp_buftype, flags, &rsp_iov);
5407         cifs_small_buf_release(iov.iov_base);
5408         if (rc) {
5409                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5410                 goto posix_qfsinf_exit;
5411         }
5412         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5413
5414         info = (FILE_SYSTEM_POSIX_INFO *)(
5415                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5416         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5417                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5418                                sizeof(FILE_SYSTEM_POSIX_INFO));
5419         if (!rc)
5420                 copy_posix_fs_info_to_kstatfs(info, fsdata);
5421
5422 posix_qfsinf_exit:
5423         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5424         return rc;
5425 }
5426
5427 int
5428 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
5429               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
5430 {
5431         struct smb_rqst rqst;
5432         struct smb2_query_info_rsp *rsp = NULL;
5433         struct kvec iov;
5434         struct kvec rsp_iov;
5435         int rc = 0;
5436         int resp_buftype;
5437         struct cifs_ses *ses = tcon->ses;
5438         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5439         struct smb2_fs_full_size_info *info = NULL;
5440         int flags = 0;
5441
5442         rc = build_qfs_info_req(&iov, tcon, server,
5443                                 FS_FULL_SIZE_INFORMATION,
5444                                 sizeof(struct smb2_fs_full_size_info),
5445                                 persistent_fid, volatile_fid);
5446         if (rc)
5447                 return rc;
5448
5449         if (smb3_encryption_required(tcon))
5450                 flags |= CIFS_TRANSFORM_REQ;
5451
5452         memset(&rqst, 0, sizeof(struct smb_rqst));
5453         rqst.rq_iov = &iov;
5454         rqst.rq_nvec = 1;
5455
5456         rc = cifs_send_recv(xid, ses, server,
5457                             &rqst, &resp_buftype, flags, &rsp_iov);
5458         cifs_small_buf_release(iov.iov_base);
5459         if (rc) {
5460                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5461                 goto qfsinf_exit;
5462         }
5463         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5464
5465         info = (struct smb2_fs_full_size_info *)(
5466                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
5467         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
5468                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
5469                                sizeof(struct smb2_fs_full_size_info));
5470         if (!rc)
5471                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
5472
5473 qfsinf_exit:
5474         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5475         return rc;
5476 }
5477
5478 int
5479 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
5480               u64 persistent_fid, u64 volatile_fid, int level)
5481 {
5482         struct smb_rqst rqst;
5483         struct smb2_query_info_rsp *rsp = NULL;
5484         struct kvec iov;
5485         struct kvec rsp_iov;
5486         int rc = 0;
5487         int resp_buftype, max_len, min_len;
5488         struct cifs_ses *ses = tcon->ses;
5489         struct TCP_Server_Info *server = cifs_pick_channel(ses);
5490         unsigned int rsp_len, offset;
5491         int flags = 0;
5492
5493         if (level == FS_DEVICE_INFORMATION) {
5494                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5495                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
5496         } else if (level == FS_ATTRIBUTE_INFORMATION) {
5497                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
5498                 min_len = MIN_FS_ATTR_INFO_SIZE;
5499         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
5500                 max_len = sizeof(struct smb3_fs_ss_info);
5501                 min_len = sizeof(struct smb3_fs_ss_info);
5502         } else if (level == FS_VOLUME_INFORMATION) {
5503                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
5504                 min_len = sizeof(struct smb3_fs_vol_info);
5505         } else {
5506                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
5507                 return -EINVAL;
5508         }
5509
5510         rc = build_qfs_info_req(&iov, tcon, server,
5511                                 level, max_len,
5512                                 persistent_fid, volatile_fid);
5513         if (rc)
5514                 return rc;
5515
5516         if (smb3_encryption_required(tcon))
5517                 flags |= CIFS_TRANSFORM_REQ;
5518
5519         memset(&rqst, 0, sizeof(struct smb_rqst));
5520         rqst.rq_iov = &iov;
5521         rqst.rq_nvec = 1;
5522
5523         rc = cifs_send_recv(xid, ses, server,
5524                             &rqst, &resp_buftype, flags, &rsp_iov);
5525         cifs_small_buf_release(iov.iov_base);
5526         if (rc) {
5527                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
5528                 goto qfsattr_exit;
5529         }
5530         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
5531
5532         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
5533         offset = le16_to_cpu(rsp->OutputBufferOffset);
5534         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
5535         if (rc)
5536                 goto qfsattr_exit;
5537
5538         if (level == FS_ATTRIBUTE_INFORMATION)
5539                 memcpy(&tcon->fsAttrInfo, offset
5540                         + (char *)rsp, min_t(unsigned int,
5541                         rsp_len, max_len));
5542         else if (level == FS_DEVICE_INFORMATION)
5543                 memcpy(&tcon->fsDevInfo, offset
5544                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
5545         else if (level == FS_SECTOR_SIZE_INFORMATION) {
5546                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
5547                         (offset + (char *)rsp);
5548                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
5549                 tcon->perf_sector_size =
5550                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
5551         } else if (level == FS_VOLUME_INFORMATION) {
5552                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
5553                         (offset + (char *)rsp);
5554                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
5555                 tcon->vol_create_time = vol_info->VolumeCreationTime;
5556         }
5557
5558 qfsattr_exit:
5559         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
5560         return rc;
5561 }
5562
5563 int
5564 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
5565            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5566            const __u32 num_lock, struct smb2_lock_element *buf)
5567 {
5568         struct smb_rqst rqst;
5569         int rc = 0;
5570         struct smb2_lock_req *req = NULL;
5571         struct kvec iov[2];
5572         struct kvec rsp_iov;
5573         int resp_buf_type;
5574         unsigned int count;
5575         int flags = CIFS_NO_RSP_BUF;
5576         unsigned int total_len;
5577         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5578
5579         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
5580
5581         rc = smb2_plain_req_init(SMB2_LOCK, tcon, server,
5582                                  (void **) &req, &total_len);
5583         if (rc)
5584                 return rc;
5585
5586         if (smb3_encryption_required(tcon))
5587                 flags |= CIFS_TRANSFORM_REQ;
5588
5589         req->hdr.Id.SyncId.ProcessId = cpu_to_le32(pid);
5590         req->LockCount = cpu_to_le16(num_lock);
5591
5592         req->PersistentFileId = persist_fid;
5593         req->VolatileFileId = volatile_fid;
5594
5595         count = num_lock * sizeof(struct smb2_lock_element);
5596
5597         iov[0].iov_base = (char *)req;
5598         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
5599         iov[1].iov_base = (char *)buf;
5600         iov[1].iov_len = count;
5601
5602         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
5603
5604         memset(&rqst, 0, sizeof(struct smb_rqst));
5605         rqst.rq_iov = iov;
5606         rqst.rq_nvec = 2;
5607
5608         rc = cifs_send_recv(xid, tcon->ses, server,
5609                             &rqst, &resp_buf_type, flags,
5610                             &rsp_iov);
5611         cifs_small_buf_release(req);
5612         if (rc) {
5613                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
5614                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
5615                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
5616                                     tcon->ses->Suid, rc);
5617         }
5618
5619         return rc;
5620 }
5621
5622 int
5623 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
5624           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
5625           const __u64 length, const __u64 offset, const __u32 lock_flags,
5626           const bool wait)
5627 {
5628         struct smb2_lock_element lock;
5629
5630         lock.Offset = cpu_to_le64(offset);
5631         lock.Length = cpu_to_le64(length);
5632         lock.Flags = cpu_to_le32(lock_flags);
5633         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
5634                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
5635
5636         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
5637 }
5638
5639 int
5640 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
5641                  __u8 *lease_key, const __le32 lease_state)
5642 {
5643         struct smb_rqst rqst;
5644         int rc;
5645         struct smb2_lease_ack *req = NULL;
5646         struct cifs_ses *ses = tcon->ses;
5647         int flags = CIFS_OBREAK_OP;
5648         unsigned int total_len;
5649         struct kvec iov[1];
5650         struct kvec rsp_iov;
5651         int resp_buf_type;
5652         __u64 *please_key_high;
5653         __u64 *please_key_low;
5654         struct TCP_Server_Info *server = cifs_pick_channel(tcon->ses);
5655
5656         cifs_dbg(FYI, "SMB2_lease_break\n");
5657         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, server,
5658                                  (void **) &req, &total_len);
5659         if (rc)
5660                 return rc;
5661
5662         if (smb3_encryption_required(tcon))
5663                 flags |= CIFS_TRANSFORM_REQ;
5664
5665         req->hdr.CreditRequest = cpu_to_le16(1);
5666         req->StructureSize = cpu_to_le16(36);
5667         total_len += 12;
5668
5669         memcpy(req->LeaseKey, lease_key, 16);
5670         req->LeaseState = lease_state;
5671
5672         flags |= CIFS_NO_RSP_BUF;
5673
5674         iov[0].iov_base = (char *)req;
5675         iov[0].iov_len = total_len;
5676
5677         memset(&rqst, 0, sizeof(struct smb_rqst));
5678         rqst.rq_iov = iov;
5679         rqst.rq_nvec = 1;
5680
5681         rc = cifs_send_recv(xid, ses, server,
5682                             &rqst, &resp_buf_type, flags, &rsp_iov);
5683         cifs_small_buf_release(req);
5684
5685         please_key_low = (__u64 *)lease_key;
5686         please_key_high = (__u64 *)(lease_key+8);
5687         if (rc) {
5688                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
5689                 trace_smb3_lease_err(le32_to_cpu(lease_state), tcon->tid,
5690                         ses->Suid, *please_key_low, *please_key_high, rc);
5691                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
5692         } else
5693                 trace_smb3_lease_done(le32_to_cpu(lease_state), tcon->tid,
5694                         ses->Suid, *please_key_low, *please_key_high);
5695
5696         return rc;
5697 }