fs/cifs/smb2pdu.c

   1 /*
   2  *   fs/cifs/smb2pdu.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2009, 2013
   5  *                 Etersoft, 2012
   6  *   Author(s): Steve French (sfrench@us.ibm.com)
   7  *              Pavel Shilovsky (pshilovsky@samba.org) 2012
   8  *
   9  *   Contains the routines for constructing the SMB2 PDUs themselves
  10  *
  11  *   This library is free software; you can redistribute it and/or modify
  12  *   it under the terms of the GNU Lesser General Public License as published
  13  *   by the Free Software Foundation; either version 2.1 of the License, or
  14  *   (at your option) any later version.
  15  *
  16  *   This library is distributed in the hope that it will be useful,
  17  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  19  *   the GNU Lesser General Public License for more details.
  20  *
  21  *   You should have received a copy of the GNU Lesser General Public License
  22  *   along with this library; if not, write to the Free Software
  23  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  24  */
  25
  26  /* SMB2 PDU handling routines here - except for leftovers (eg session setup) */
  27  /* Note that there are handle based routines which must be                   */
  28  /* treated slightly differently for reconnection purposes since we never     */
  29  /* want to reuse a stale file handle and only the caller knows the file info */
  30
  31 #include <linux/fs.h>
  32 #include <linux/kernel.h>
  33 #include <linux/vfs.h>
  34 #include <linux/task_io_accounting_ops.h>
  35 #include <linux/uaccess.h>
  36 #include <linux/uuid.h>
  37 #include <linux/pagemap.h>
  38 #include <linux/xattr.h>
  39 #include "smb2pdu.h"
  40 #include "cifsglob.h"
  41 #include "cifsacl.h"
  42 #include "cifsproto.h"
  43 #include "smb2proto.h"
  44 #include "cifs_unicode.h"
  45 #include "cifs_debug.h"
  46 #include "ntlmssp.h"
  47 #include "smb2status.h"
  48 #include "smb2glob.h"
  49 #include "cifspdu.h"
  50 #include "cifs_spnego.h"
  51 #include "smbdirect.h"
  52 #include "trace.h"
  53
  54 /*
  55  *  The following table defines the expected "StructureSize" of SMB2 requests
  56  *  in order by SMB2 command.  This is similar to "wct" in SMB/CIFS requests.
  57  *
  58  *  Note that commands are defined in smb2pdu.h in le16 but the array below is
  59  *  indexed by command in host byte order.
  60  */
  61 static const int smb2_req_struct_sizes[NUMBER_OF_SMB2_COMMANDS] = {
  62         /* SMB2_NEGOTIATE */ 36,
  63         /* SMB2_SESSION_SETUP */ 25,
  64         /* SMB2_LOGOFF */ 4,
  65         /* SMB2_TREE_CONNECT */ 9,
  66         /* SMB2_TREE_DISCONNECT */ 4,
  67         /* SMB2_CREATE */ 57,
  68         /* SMB2_CLOSE */ 24,
  69         /* SMB2_FLUSH */ 24,
  70         /* SMB2_READ */ 49,
  71         /* SMB2_WRITE */ 49,
  72         /* SMB2_LOCK */ 48,
  73         /* SMB2_IOCTL */ 57,
  74         /* SMB2_CANCEL */ 4,
  75         /* SMB2_ECHO */ 4,
  76         /* SMB2_QUERY_DIRECTORY */ 33,
  77         /* SMB2_CHANGE_NOTIFY */ 32,
  78         /* SMB2_QUERY_INFO */ 41,
  79         /* SMB2_SET_INFO */ 33,
  80         /* SMB2_OPLOCK_BREAK */ 24 /* BB this is 36 for LEASE_BREAK variant */
  81 };
  82
  83 int smb3_encryption_required(const struct cifs_tcon *tcon)
  84 {
  85         if (!tcon)
  86                 return 0;
  87         if ((tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
  88             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
  89                 return 1;
  90         if (tcon->seal &&
  91             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
  92                 return 1;
  93         return 0;
  94 }
  95
  96 static void
  97 smb2_hdr_assemble(struct smb2_sync_hdr *shdr, __le16 smb2_cmd,
  98                   const struct cifs_tcon *tcon)
  99 {
 100         shdr->ProtocolId = SMB2_PROTO_NUMBER;
 101         shdr->StructureSize = cpu_to_le16(64);
 102         shdr->Command = smb2_cmd;
 103         if (tcon && tcon->ses && tcon->ses->server) {
 104                 struct TCP_Server_Info *server = tcon->ses->server;
 105
 106                 spin_lock(&server->req_lock);
 107                 /* Request up to 2 credits but don't go over the limit. */
 108                 if (server->credits >= server->max_credits)
 109                         shdr->CreditRequest = cpu_to_le16(0);
 110                 else
 111                         shdr->CreditRequest = cpu_to_le16(
 112                                 min_t(int, server->max_credits -
 113                                                 server->credits, 2));
 114                 spin_unlock(&server->req_lock);
 115         } else {
 116                 shdr->CreditRequest = cpu_to_le16(2);
 117         }
 118         shdr->ProcessId = cpu_to_le32((__u16)current->tgid);
 119
 120         if (!tcon)
 121                 goto out;
 122
 123         /* GLOBAL_CAP_LARGE_MTU will only be set if dialect > SMB2.02 */
 124         /* See sections 2.2.4 and 3.2.4.1.5 of MS-SMB2 */
 125         if ((tcon->ses) && (tcon->ses->server) &&
 126             (tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
 127                 shdr->CreditCharge = cpu_to_le16(1);
 128         /* else CreditCharge MBZ */
 129
 130         shdr->TreeId = tcon->tid;
 131         /* Uid is not converted */
 132         if (tcon->ses)
 133                 shdr->SessionId = tcon->ses->Suid;
 134
 135         /*
 136          * If we would set SMB2_FLAGS_DFS_OPERATIONS on open we also would have
 137          * to pass the path on the Open SMB prefixed by \\server\share.
 138          * Not sure when we would need to do the augmented path (if ever) and
 139          * setting this flag breaks the SMB2 open operation since it is
 140          * illegal to send an empty path name (without \\server\share prefix)
 141          * when the DFS flag is set in the SMB open header. We could
 142          * consider setting the flag on all operations other than open
 143          * but it is safer to net set it for now.
 144          */
 145 /*      if (tcon->share_flags & SHI1005_FLAGS_DFS)
 146                 shdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
 147
 148         if (tcon->ses && tcon->ses->server && tcon->ses->server->sign &&
 149             !smb3_encryption_required(tcon))
 150                 shdr->Flags |= SMB2_FLAGS_SIGNED;
 151 out:
 152         return;
 153 }
 154
 155 static int
 156 smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon)
 157 {
 158         int rc;
 159         struct nls_table *nls_codepage;
 160         struct cifs_ses *ses;
 161         struct TCP_Server_Info *server;
 162
 163         /*
 164          * SMB2s NegProt, SessSetup, Logoff do not have tcon yet so
 165          * check for tcp and smb session status done differently
 166          * for those three - in the calling routine.
 167          */
 168         if (tcon == NULL)
 169                 return 0;
 170
 171         if (smb2_command == SMB2_TREE_CONNECT)
 172                 return 0;
 173
 174         if (tcon->tidStatus == CifsExiting) {
 175                 /*
 176                  * only tree disconnect, open, and write,
 177                  * (and ulogoff which does not have tcon)
 178                  * are allowed as we start force umount.
 179                  */
 180                 if ((smb2_command != SMB2_WRITE) &&
 181                    (smb2_command != SMB2_CREATE) &&
 182                    (smb2_command != SMB2_TREE_DISCONNECT)) {
 183                         cifs_dbg(FYI, "can not send cmd %d while umounting\n",
 184                                  smb2_command);
 185                         return -ENODEV;
 186                 }
 187         }
 188         if ((!tcon->ses) || (tcon->ses->status == CifsExiting) ||
 189             (!tcon->ses->server))
 190                 return -EIO;
 191
 192         ses = tcon->ses;
 193         server = ses->server;
 194
 195         /*
 196          * Give demultiplex thread up to 10 seconds to reconnect, should be
 197          * greater than cifs socket timeout which is 7 seconds
 198          */
 199         while (server->tcpStatus == CifsNeedReconnect) {
 200                 /*
 201                  * Return to caller for TREE_DISCONNECT and LOGOFF and CLOSE
 202                  * here since they are implicitly done when session drops.
 203                  */
 204                 switch (smb2_command) {
 205                 /*
 206                  * BB Should we keep oplock break and add flush to exceptions?
 207                  */
 208                 case SMB2_TREE_DISCONNECT:
 209                 case SMB2_CANCEL:
 210                 case SMB2_CLOSE:
 211                 case SMB2_OPLOCK_BREAK:
 212                         return -EAGAIN;
 213                 }
 214
 215                 rc = wait_event_interruptible_timeout(server->response_q,
 216                                                       (server->tcpStatus != CifsNeedReconnect),
 217                                                       10 * HZ);
 218                 if (rc < 0) {
 219                         cifs_dbg(FYI, "%s: aborting reconnect due to a received"
 220                                  " signal by the process\n", __func__);
 221                         return -ERESTARTSYS;
 222                 }
 223
 224                 /* are we still trying to reconnect? */
 225                 if (server->tcpStatus != CifsNeedReconnect)
 226                         break;
 227
 228                 /*
 229                  * on "soft" mounts we wait once. Hard mounts keep
 230                  * retrying until process is killed or server comes
 231                  * back on-line
 232                  */
 233                 if (!tcon->retry) {
 234                         cifs_dbg(FYI, "gave up waiting on reconnect in smb_init\n");
 235                         return -EHOSTDOWN;
 236                 }
 237         }
 238
 239         if (!tcon->ses->need_reconnect && !tcon->need_reconnect)
 240                 return 0;
 241
 242         nls_codepage = load_nls_default();
 243
 244         /*
 245          * need to prevent multiple threads trying to simultaneously reconnect
 246          * the same SMB session
 247          */
 248         mutex_lock(&tcon->ses->session_mutex);
 249
 250         /*
 251          * Recheck after acquire mutex. If another thread is negotiating
 252          * and the server never sends an answer the socket will be closed
 253          * and tcpStatus set to reconnect.
 254          */
 255         if (server->tcpStatus == CifsNeedReconnect) {
 256                 rc = -EHOSTDOWN;
 257                 mutex_unlock(&tcon->ses->session_mutex);
 258                 goto out;
 259         }
 260
 261         rc = cifs_negotiate_protocol(0, tcon->ses);
 262         if (!rc && tcon->ses->need_reconnect) {
 263                 rc = cifs_setup_session(0, tcon->ses, nls_codepage);
 264                 if ((rc == -EACCES) && !tcon->retry) {
 265                         rc = -EHOSTDOWN;
 266                         mutex_unlock(&tcon->ses->session_mutex);
 267                         goto failed;
 268                 } else if (rc) {
 269                         mutex_unlock(&ses->session_mutex);
 270                         goto out;
 271                 }
 272         }
 273         if (rc || !tcon->need_reconnect) {
 274                 mutex_unlock(&tcon->ses->session_mutex);
 275                 goto out;
 276         }
 277
 278         cifs_mark_open_files_invalid(tcon);
 279         if (tcon->use_persistent)
 280                 tcon->need_reopen_files = true;
 281
 282         rc = SMB2_tcon(0, tcon->ses, tcon->treeName, tcon, nls_codepage);
 283         mutex_unlock(&tcon->ses->session_mutex);
 284
 285         cifs_dbg(FYI, "reconnect tcon rc = %d\n", rc);
 286         if (rc) {
 287                 /* If sess reconnected but tcon didn't, something strange ... */
 288                 printk_once(KERN_WARNING "reconnect tcon failed rc = %d\n", rc);
 289                 goto out;
 290         }
 291
 292         if (smb2_command != SMB2_INTERNAL_CMD)
 293                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
 294
 295         atomic_inc(&tconInfoReconnectCount);
 296 out:
 297         /*
 298          * Check if handle based operation so we know whether we can continue
 299          * or not without returning to caller to reset file handle.
 300          */
 301         /*
 302          * BB Is flush done by server on drop of tcp session? Should we special
 303          * case it and skip above?
 304          */
 305         switch (smb2_command) {
 306         case SMB2_FLUSH:
 307         case SMB2_READ:
 308         case SMB2_WRITE:
 309         case SMB2_LOCK:
 310         case SMB2_IOCTL:
 311         case SMB2_QUERY_DIRECTORY:
 312         case SMB2_CHANGE_NOTIFY:
 313         case SMB2_QUERY_INFO:
 314         case SMB2_SET_INFO:
 315                 rc = -EAGAIN;
 316         }
 317 failed:
 318         unload_nls(nls_codepage);
 319         return rc;
 320 }
 321
 322 static void
 323 fill_small_buf(__le16 smb2_command, struct cifs_tcon *tcon, void *buf,
 324                unsigned int *total_len)
 325 {
 326         struct smb2_sync_pdu *spdu = (struct smb2_sync_pdu *)buf;
 327         /* lookup word count ie StructureSize from table */
 328         __u16 parmsize = smb2_req_struct_sizes[le16_to_cpu(smb2_command)];
 329
 330         /*
 331          * smaller than SMALL_BUFFER_SIZE but bigger than fixed area of
 332          * largest operations (Create)
 333          */
 334         memset(buf, 0, 256);
 335
 336         smb2_hdr_assemble(&spdu->sync_hdr, smb2_command, tcon);
 337         spdu->StructureSize2 = cpu_to_le16(parmsize);
 338
 339         *total_len = parmsize + sizeof(struct smb2_sync_hdr);
 340 }
 341
 342 /*
 343  * Allocate and return pointer to an SMB request hdr, and set basic
 344  * SMB information in the SMB header. If the return code is zero, this
 345  * function must have filled in request_buf pointer.
 346  */
 347 static int __smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 348                                   void **request_buf, unsigned int *total_len)
 349 {
 350         /* BB eventually switch this to SMB2 specific small buf size */
 351         if (smb2_command == SMB2_SET_INFO)
 352                 *request_buf = cifs_buf_get();
 353         else
 354                 *request_buf = cifs_small_buf_get();
 355         if (*request_buf == NULL) {
 356                 /* BB should we add a retry in here if not a writepage? */
 357                 return -ENOMEM;
 358         }
 359
 360         fill_small_buf(smb2_command, tcon,
 361                        (struct smb2_sync_hdr *)(*request_buf),
 362                        total_len);
 363
 364         if (tcon != NULL) {
 365                 uint16_t com_code = le16_to_cpu(smb2_command);
 366                 cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_sent[com_code]);
 367                 cifs_stats_inc(&tcon->num_smbs_sent);
 368         }
 369
 370         return 0;
 371 }
 372
 373 static int smb2_plain_req_init(__le16 smb2_command, struct cifs_tcon *tcon,
 374                                void **request_buf, unsigned int *total_len)
 375 {
 376         int rc;
 377
 378         rc = smb2_reconnect(smb2_command, tcon);
 379         if (rc)
 380                 return rc;
 381
 382         return __smb2_plain_req_init(smb2_command, tcon, request_buf,
 383                                      total_len);
 384 }
 385
 386 static int smb2_ioctl_req_init(u32 opcode, struct cifs_tcon *tcon,
 387                                void **request_buf, unsigned int *total_len)
 388 {
 389         /* Skip reconnect only for FSCTL_VALIDATE_NEGOTIATE_INFO IOCTLs */
 390         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO) {
 391                 return __smb2_plain_req_init(SMB2_IOCTL, tcon, request_buf,
 392                                              total_len);
 393         }
 394         return smb2_plain_req_init(SMB2_IOCTL, tcon, request_buf, total_len);
 395 }
 396
 397
 398 /* offset is sizeof smb2_negotiate_req but rounded up to 8 bytes */
 399 #define OFFSET_OF_NEG_CONTEXT 0x68  /* sizeof(struct smb2_negotiate_req) */
 400
 401
 402 #define SMB2_PREAUTH_INTEGRITY_CAPABILITIES     cpu_to_le16(1)
 403 #define SMB2_ENCRYPTION_CAPABILITIES            cpu_to_le16(2)
 404 #define SMB2_POSIX_EXTENSIONS_AVAILABLE         cpu_to_le16(0x100)
 405
 406 static void
 407 build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt)
 408 {
 409         pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
 410         pneg_ctxt->DataLength = cpu_to_le16(38);
 411         pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
 412         pneg_ctxt->SaltLength = cpu_to_le16(SMB311_LINUX_CLIENT_SALT_SIZE);
 413         get_random_bytes(pneg_ctxt->Salt, SMB311_LINUX_CLIENT_SALT_SIZE);
 414         pneg_ctxt->HashAlgorithms = SMB2_PREAUTH_INTEGRITY_SHA512;
 415 }
 416
 417 static void
 418 build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt)
 419 {
 420         pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
 421         pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + le16 cipher */
 422         pneg_ctxt->CipherCount = cpu_to_le16(1);
 423 /* pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM;*/ /* not supported yet */
 424         pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_CCM;
 425 }
 426
 427 static void
 428 build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
 429 {
 430         pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
 431         pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
 432 }
 433
 434 static void
 435 assemble_neg_contexts(struct smb2_negotiate_req *req,
 436                       unsigned int *total_len)
 437 {
 438         char *pneg_ctxt = (char *)req + OFFSET_OF_NEG_CONTEXT;
 439         unsigned int ctxt_len;
 440
 441         *total_len += 2; /* Add 2 due to round to 8 byte boundary for 1st ctxt */
 442         build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt);
 443         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_preauth_neg_context), 8) * 8;
 444         *total_len += ctxt_len;
 445         pneg_ctxt += ctxt_len;
 446
 447         build_encrypt_ctxt((struct smb2_encryption_neg_context *)pneg_ctxt);
 448         ctxt_len = DIV_ROUND_UP(sizeof(struct smb2_encryption_neg_context), 8) * 8;
 449         *total_len += ctxt_len;
 450         pneg_ctxt += ctxt_len;
 451
 452         build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
 453         *total_len += sizeof(struct smb2_posix_neg_context);
 454
 455         req->NegotiateContextOffset = cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
 456         req->NegotiateContextCount = cpu_to_le16(3);
 457 }
 458
 459 static void decode_preauth_context(struct smb2_preauth_neg_context *ctxt)
 460 {
 461         unsigned int len = le16_to_cpu(ctxt->DataLength);
 462
 463         /* If invalid preauth context warn but use what we requested, SHA-512 */
 464         if (len < MIN_PREAUTH_CTXT_DATA_LEN) {
 465                 printk_once(KERN_WARNING "server sent bad preauth context\n");
 466                 return;
 467         } else if (len < MIN_PREAUTH_CTXT_DATA_LEN + le16_to_cpu(ctxt->SaltLength)) {
 468                 pr_warn_once("server sent invalid SaltLength\n");
 469                 return;
 470         }
 471         if (le16_to_cpu(ctxt->HashAlgorithmCount) != 1)
 472                 printk_once(KERN_WARNING "illegal SMB3 hash algorithm count\n");
 473         if (ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
 474                 printk_once(KERN_WARNING "unknown SMB3 hash algorithm\n");
 475 }
 476
 477 static int decode_encrypt_ctx(struct TCP_Server_Info *server,
 478                               struct smb2_encryption_neg_context *ctxt)
 479 {
 480         unsigned int len = le16_to_cpu(ctxt->DataLength);
 481
 482         cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
 483         if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
 484                 printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
 485                 return -EINVAL;
 486         }
 487
 488         if (le16_to_cpu(ctxt->CipherCount) != 1) {
 489                 printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
 490                 return -EINVAL;
 491         }
 492         cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
 493         if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
 494             (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
 495                 printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
 496                 return -EINVAL;
 497         }
 498         server->cipher_type = ctxt->Ciphers[0];
 499         server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
 500         return 0;
 501 }
 502
 503 static int smb311_decode_neg_context(struct smb2_negotiate_rsp *rsp,
 504                                      struct TCP_Server_Info *server,
 505                                      unsigned int len_of_smb)
 506 {
 507         struct smb2_neg_context *pctx;
 508         unsigned int offset = le32_to_cpu(rsp->NegotiateContextOffset);
 509         unsigned int ctxt_cnt = le16_to_cpu(rsp->NegotiateContextCount);
 510         unsigned int len_of_ctxts, i;
 511         int rc = 0;
 512
 513         cifs_dbg(FYI, "decoding %d negotiate contexts\n", ctxt_cnt);
 514         if (len_of_smb <= offset) {
 515                 cifs_dbg(VFS, "Invalid response: negotiate context offset\n");
 516                 return -EINVAL;
 517         }
 518
 519         len_of_ctxts = len_of_smb - offset;
 520
 521         for (i = 0; i < ctxt_cnt; i++) {
 522                 int clen;
 523                 /* check that offset is not beyond end of SMB */
 524                 if (len_of_ctxts == 0)
 525                         break;
 526
 527                 if (len_of_ctxts < sizeof(struct smb2_neg_context))
 528                         break;
 529
 530                 pctx = (struct smb2_neg_context *)(offset + (char *)rsp);
 531                 clen = le16_to_cpu(pctx->DataLength);
 532                 if (clen > len_of_ctxts)
 533                         break;
 534
 535                 if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES)
 536                         decode_preauth_context(
 537                                 (struct smb2_preauth_neg_context *)pctx);
 538                 else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES)
 539                         rc = decode_encrypt_ctx(server,
 540                                 (struct smb2_encryption_neg_context *)pctx);
 541                 else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE)
 542                         server->posix_ext_supported = true;
 543                 else
 544                         cifs_dbg(VFS, "unknown negcontext of type %d ignored\n",
 545                                 le16_to_cpu(pctx->ContextType));
 546
 547                 if (rc)
 548                         break;
 549                 /* offsets must be 8 byte aligned */
 550                 clen = (clen + 7) & ~0x7;
 551                 offset += clen + sizeof(struct smb2_neg_context);
 552                 len_of_ctxts -= clen;
 553         }
 554         return rc;
 555 }
 556
 557 static struct create_posix *
 558 create_posix_buf(umode_t mode)
 559 {
 560         struct create_posix *buf;
 561
 562         buf = kzalloc(sizeof(struct create_posix),
 563                         GFP_KERNEL);
 564         if (!buf)
 565                 return NULL;
 566
 567         buf->ccontext.DataOffset =
 568                 cpu_to_le16(offsetof(struct create_posix, Mode));
 569         buf->ccontext.DataLength = cpu_to_le32(4);
 570         buf->ccontext.NameOffset =
 571                 cpu_to_le16(offsetof(struct create_posix, Name));
 572         buf->ccontext.NameLength = cpu_to_le16(16);
 573
 574         /* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
 575         buf->Name[0] = 0x93;
 576         buf->Name[1] = 0xAD;
 577         buf->Name[2] = 0x25;
 578         buf->Name[3] = 0x50;
 579         buf->Name[4] = 0x9C;
 580         buf->Name[5] = 0xB4;
 581         buf->Name[6] = 0x11;
 582         buf->Name[7] = 0xE7;
 583         buf->Name[8] = 0xB4;
 584         buf->Name[9] = 0x23;
 585         buf->Name[10] = 0x83;
 586         buf->Name[11] = 0xDE;
 587         buf->Name[12] = 0x96;
 588         buf->Name[13] = 0x8B;
 589         buf->Name[14] = 0xCD;
 590         buf->Name[15] = 0x7C;
 591         buf->Mode = cpu_to_le32(mode);
 592         cifs_dbg(FYI, "mode on posix create 0%o", mode);
 593         return buf;
 594 }
 595
 596 static int
 597 add_posix_context(struct kvec *iov, unsigned int *num_iovec, umode_t mode)
 598 {
 599         struct smb2_create_req *req = iov[0].iov_base;
 600         unsigned int num = *num_iovec;
 601
 602         iov[num].iov_base = create_posix_buf(mode);
 603         if (iov[num].iov_base == NULL)
 604                 return -ENOMEM;
 605         iov[num].iov_len = sizeof(struct create_posix);
 606         if (!req->CreateContextsOffset)
 607                 req->CreateContextsOffset = cpu_to_le32(
 608                                 sizeof(struct smb2_create_req) +
 609                                 iov[num - 1].iov_len);
 610         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_posix));
 611         *num_iovec = num + 1;
 612         return 0;
 613 }
 614
 615
 616 /*
 617  *
 618  *      SMB2 Worker functions follow:
 619  *
 620  *      The general structure of the worker functions is:
 621  *      1) Call smb2_init (assembles SMB2 header)
 622  *      2) Initialize SMB2 command specific fields in fixed length area of SMB
 623  *      3) Call smb_sendrcv2 (sends request on socket and waits for response)
 624  *      4) Decode SMB2 command specific fields in the fixed length area
 625  *      5) Decode variable length data area (if any for this SMB2 command type)
 626  *      6) Call free smb buffer
 627  *      7) return
 628  *
 629  */
 630
 631 int
 632 SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 633 {
 634         struct smb_rqst rqst;
 635         struct smb2_negotiate_req *req;
 636         struct smb2_negotiate_rsp *rsp;
 637         struct kvec iov[1];
 638         struct kvec rsp_iov;
 639         int rc = 0;
 640         int resp_buftype;
 641         struct TCP_Server_Info *server = ses->server;
 642         int blob_offset, blob_length;
 643         char *security_blob;
 644         int flags = CIFS_NEG_OP;
 645         unsigned int total_len;
 646
 647         cifs_dbg(FYI, "Negotiate protocol\n");
 648
 649         if (!server) {
 650                 WARN(1, "%s: server is NULL!\n", __func__);
 651                 return -EIO;
 652         }
 653
 654         rc = smb2_plain_req_init(SMB2_NEGOTIATE, NULL, (void **) &req, &total_len);
 655         if (rc)
 656                 return rc;
 657
 658         req->sync_hdr.SessionId = 0;
 659
 660         memset(server->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 661         memset(ses->preauth_sha_hash, 0, SMB2_PREAUTH_HASH_SIZE);
 662
 663         if (strcmp(ses->server->vals->version_string,
 664                    SMB3ANY_VERSION_STRING) == 0) {
 665                 req->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 666                 req->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 667                 req->DialectCount = cpu_to_le16(2);
 668                 total_len += 4;
 669         } else if (strcmp(ses->server->vals->version_string,
 670                    SMBDEFAULT_VERSION_STRING) == 0) {
 671                 req->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 672                 req->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 673                 req->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 674                 req->DialectCount = cpu_to_le16(3);
 675                 total_len += 6;
 676         } else {
 677                 /* otherwise send specific dialect */
 678                 req->Dialects[0] = cpu_to_le16(ses->server->vals->protocol_id);
 679                 req->DialectCount = cpu_to_le16(1);
 680                 total_len += 2;
 681         }
 682
 683         /* only one of SMB2 signing flags may be set in SMB2 request */
 684         if (ses->sign)
 685                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 686         else if (global_secflags & CIFSSEC_MAY_SIGN)
 687                 req->SecurityMode = cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 688         else
 689                 req->SecurityMode = 0;
 690
 691         req->Capabilities = cpu_to_le32(ses->server->vals->req_capabilities);
 692
 693         /* ClientGUID must be zero for SMB2.02 dialect */
 694         if (ses->server->vals->protocol_id == SMB20_PROT_ID)
 695                 memset(req->ClientGUID, 0, SMB2_CLIENT_GUID_SIZE);
 696         else {
 697                 memcpy(req->ClientGUID, server->client_guid,
 698                         SMB2_CLIENT_GUID_SIZE);
 699                 if (ses->server->vals->protocol_id == SMB311_PROT_ID)
 700                         assemble_neg_contexts(req, &total_len);
 701         }
 702         iov[0].iov_base = (char *)req;
 703         iov[0].iov_len = total_len;
 704
 705         memset(&rqst, 0, sizeof(struct smb_rqst));
 706         rqst.rq_iov = iov;
 707         rqst.rq_nvec = 1;
 708
 709         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
 710         cifs_small_buf_release(req);
 711         rsp = (struct smb2_negotiate_rsp *)rsp_iov.iov_base;
 712         /*
 713          * No tcon so can't do
 714          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
 715          */
 716         if (rc == -EOPNOTSUPP) {
 717                 cifs_dbg(VFS, "Dialect not supported by server. Consider "
 718                         "specifying vers=1.0 or vers=2.0 on mount for accessing"
 719                         " older servers\n");
 720                 goto neg_exit;
 721         } else if (rc != 0)
 722                 goto neg_exit;
 723
 724         if (strcmp(ses->server->vals->version_string,
 725                    SMB3ANY_VERSION_STRING) == 0) {
 726                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 727                         cifs_dbg(VFS,
 728                                 "SMB2 dialect returned but not requested\n");
 729                         return -EIO;
 730                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 731                         cifs_dbg(VFS,
 732                                 "SMB2.1 dialect returned but not requested\n");
 733                         return -EIO;
 734                 }
 735         } else if (strcmp(ses->server->vals->version_string,
 736                    SMBDEFAULT_VERSION_STRING) == 0) {
 737                 if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID)) {
 738                         cifs_dbg(VFS,
 739                                 "SMB2 dialect returned but not requested\n");
 740                         return -EIO;
 741                 } else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID)) {
 742                         /* ops set to 3.0 by default for default so update */
 743                         ses->server->ops = &smb21_operations;
 744                         ses->server->vals = &smb21_values;
 745                 }
 746         } else if (le16_to_cpu(rsp->DialectRevision) !=
 747                                 ses->server->vals->protocol_id) {
 748                 /* if requested single dialect ensure returned dialect matched */
 749                 cifs_dbg(VFS, "Illegal 0x%x dialect returned: not requested\n",
 750                         le16_to_cpu(rsp->DialectRevision));
 751                 return -EIO;
 752         }
 753
 754         cifs_dbg(FYI, "mode 0x%x\n", rsp->SecurityMode);
 755
 756         if (rsp->DialectRevision == cpu_to_le16(SMB20_PROT_ID))
 757                 cifs_dbg(FYI, "negotiated smb2.0 dialect\n");
 758         else if (rsp->DialectRevision == cpu_to_le16(SMB21_PROT_ID))
 759                 cifs_dbg(FYI, "negotiated smb2.1 dialect\n");
 760         else if (rsp->DialectRevision == cpu_to_le16(SMB30_PROT_ID))
 761                 cifs_dbg(FYI, "negotiated smb3.0 dialect\n");
 762         else if (rsp->DialectRevision == cpu_to_le16(SMB302_PROT_ID))
 763                 cifs_dbg(FYI, "negotiated smb3.02 dialect\n");
 764         else if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID))
 765                 cifs_dbg(FYI, "negotiated smb3.1.1 dialect\n");
 766         else {
 767                 cifs_dbg(VFS, "Illegal dialect returned by server 0x%x\n",
 768                          le16_to_cpu(rsp->DialectRevision));
 769                 rc = -EIO;
 770                 goto neg_exit;
 771         }
 772         server->dialect = le16_to_cpu(rsp->DialectRevision);
 773
 774         /*
 775          * Keep a copy of the hash after negprot. This hash will be
 776          * the starting hash value for all sessions made from this
 777          * server.
 778          */
 779         memcpy(server->preauth_sha_hash, ses->preauth_sha_hash,
 780                SMB2_PREAUTH_HASH_SIZE);
 781
 782         /* SMB2 only has an extended negflavor */
 783         server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
 784         /* set it to the maximum buffer size value we can send with 1 credit */
 785         server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
 786                                SMB2_MAX_BUFFER_SIZE);
 787         server->max_read = le32_to_cpu(rsp->MaxReadSize);
 788         server->max_write = le32_to_cpu(rsp->MaxWriteSize);
 789         server->sec_mode = le16_to_cpu(rsp->SecurityMode);
 790         if ((server->sec_mode & SMB2_SEC_MODE_FLAGS_ALL) != server->sec_mode)
 791                 cifs_dbg(FYI, "Server returned unexpected security mode 0x%x\n",
 792                                 server->sec_mode);
 793         server->capabilities = le32_to_cpu(rsp->Capabilities);
 794         /* Internal types */
 795         server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES;
 796
 797         /*
 798          * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context
 799          * Set the cipher type manually.
 800          */
 801         if (server->dialect == SMB30_PROT_ID && (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
 802                 server->cipher_type = SMB2_ENCRYPTION_AES128_CCM;
 803
 804         security_blob = smb2_get_data_area_len(&blob_offset, &blob_length,
 805                                                (struct smb2_sync_hdr *)rsp);
 806         /*
 807          * See MS-SMB2 section 2.2.4: if no blob, client picks default which
 808          * for us will be
 809          *      ses->sectype = RawNTLMSSP;
 810          * but for time being this is our only auth choice so doesn't matter.
 811          * We just found a server which sets blob length to zero expecting raw.
 812          */
 813         if (blob_length == 0) {
 814                 cifs_dbg(FYI, "missing security blob on negprot\n");
 815                 server->sec_ntlmssp = true;
 816         }
 817
 818         rc = cifs_enable_signing(server, ses->sign);
 819         if (rc)
 820                 goto neg_exit;
 821         if (blob_length) {
 822                 rc = decode_negTokenInit(security_blob, blob_length, server);
 823                 if (rc == 1)
 824                         rc = 0;
 825                 else if (rc == 0)
 826                         rc = -EIO;
 827         }
 828
 829         if (rsp->DialectRevision == cpu_to_le16(SMB311_PROT_ID)) {
 830                 if (rsp->NegotiateContextCount)
 831                         rc = smb311_decode_neg_context(rsp, server,
 832                                                        rsp_iov.iov_len);
 833                 else
 834                         cifs_dbg(VFS, "Missing expected negotiate contexts\n");
 835         }
 836 neg_exit:
 837         free_rsp_buf(resp_buftype, rsp);
 838         return rc;
 839 }
 840
 841 int smb3_validate_negotiate(const unsigned int xid, struct cifs_tcon *tcon)
 842 {
 843         int rc;
 844         struct validate_negotiate_info_req *pneg_inbuf;
 845         struct validate_negotiate_info_rsp *pneg_rsp = NULL;
 846         u32 rsplen;
 847         u32 inbuflen; /* max of 4 dialects */
 848
 849         cifs_dbg(FYI, "validate negotiate\n");
 850
 851         /* In SMB3.11 preauth integrity supersedes validate negotiate */
 852         if (tcon->ses->server->dialect == SMB311_PROT_ID)
 853                 return 0;
 854
 855         /*
 856          * validation ioctl must be signed, so no point sending this if we
 857          * can not sign it (ie are not known user).  Even if signing is not
 858          * required (enabled but not negotiated), in those cases we selectively
 859          * sign just this, the first and only signed request on a connection.
 860          * Having validation of negotiate info  helps reduce attack vectors.
 861          */
 862         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
 863                 return 0; /* validation requires signing */
 864
 865         if (tcon->ses->user_name == NULL) {
 866                 cifs_dbg(FYI, "Can't validate negotiate: null user mount\n");
 867                 return 0; /* validation requires signing */
 868         }
 869
 870         if (tcon->ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
 871                 cifs_dbg(VFS, "Unexpected null user (anonymous) auth flag sent by server\n");
 872
 873         pneg_inbuf = kmalloc(sizeof(*pneg_inbuf), GFP_NOFS);
 874         if (!pneg_inbuf)
 875                 return -ENOMEM;
 876
 877         pneg_inbuf->Capabilities =
 878                         cpu_to_le32(tcon->ses->server->vals->req_capabilities);
 879         memcpy(pneg_inbuf->Guid, tcon->ses->server->client_guid,
 880                                         SMB2_CLIENT_GUID_SIZE);
 881
 882         if (tcon->ses->sign)
 883                 pneg_inbuf->SecurityMode =
 884                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_REQUIRED);
 885         else if (global_secflags & CIFSSEC_MAY_SIGN)
 886                 pneg_inbuf->SecurityMode =
 887                         cpu_to_le16(SMB2_NEGOTIATE_SIGNING_ENABLED);
 888         else
 889                 pneg_inbuf->SecurityMode = 0;
 890
 891
 892         if (strcmp(tcon->ses->server->vals->version_string,
 893                 SMB3ANY_VERSION_STRING) == 0) {
 894                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB30_PROT_ID);
 895                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB302_PROT_ID);
 896                 pneg_inbuf->DialectCount = cpu_to_le16(2);
 897                 /* structure is big enough for 3 dialects, sending only 2 */
 898                 inbuflen = sizeof(*pneg_inbuf) -
 899                                 sizeof(pneg_inbuf->Dialects[0]);
 900         } else if (strcmp(tcon->ses->server->vals->version_string,
 901                 SMBDEFAULT_VERSION_STRING) == 0) {
 902                 pneg_inbuf->Dialects[0] = cpu_to_le16(SMB21_PROT_ID);
 903                 pneg_inbuf->Dialects[1] = cpu_to_le16(SMB30_PROT_ID);
 904                 pneg_inbuf->Dialects[2] = cpu_to_le16(SMB302_PROT_ID);
 905                 pneg_inbuf->DialectCount = cpu_to_le16(3);
 906                 /* structure is big enough for 3 dialects */
 907                 inbuflen = sizeof(*pneg_inbuf);
 908         } else {
 909                 /* otherwise specific dialect was requested */
 910                 pneg_inbuf->Dialects[0] =
 911                         cpu_to_le16(tcon->ses->server->vals->protocol_id);
 912                 pneg_inbuf->DialectCount = cpu_to_le16(1);
 913                 /* structure is big enough for 3 dialects, sending only 1 */
 914                 inbuflen = sizeof(*pneg_inbuf) -
 915                                 sizeof(pneg_inbuf->Dialects[0]) * 2;
 916         }
 917
 918         rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
 919                 FSCTL_VALIDATE_NEGOTIATE_INFO, true /* is_fsctl */,
 920                 (char *)pneg_inbuf, inbuflen, (char **)&pneg_rsp, &rsplen);
 921         if (rc == -EOPNOTSUPP) {
 922                 /*
 923                  * Old Windows versions or Netapp SMB server can return
 924                  * not supported error. Client should accept it.
 925                  */
 926                 cifs_dbg(VFS, "Server does not support validate negotiate\n");
 927                 rc = 0;
 928                 goto out_free_inbuf;
 929         } else if (rc != 0) {
 930                 cifs_dbg(VFS, "validate protocol negotiate failed: %d\n", rc);
 931                 rc = -EIO;
 932                 goto out_free_inbuf;
 933         }
 934
 935         rc = -EIO;
 936         if (rsplen != sizeof(*pneg_rsp)) {
 937                 cifs_dbg(VFS, "invalid protocol negotiate response size: %d\n",
 938                          rsplen);
 939
 940                 /* relax check since Mac returns max bufsize allowed on ioctl */
 941                 if (rsplen > CIFSMaxBufSize || rsplen < sizeof(*pneg_rsp))
 942                         goto out_free_rsp;
 943         }
 944
 945         /* check validate negotiate info response matches what we got earlier */
 946         if (pneg_rsp->Dialect != cpu_to_le16(tcon->ses->server->dialect))
 947                 goto vneg_out;
 948
 949         if (pneg_rsp->SecurityMode != cpu_to_le16(tcon->ses->server->sec_mode))
 950                 goto vneg_out;
 951
 952         /* do not validate server guid because not saved at negprot time yet */
 953
 954         if ((le32_to_cpu(pneg_rsp->Capabilities) | SMB2_NT_FIND |
 955               SMB2_LARGE_FILES) != tcon->ses->server->capabilities)
 956                 goto vneg_out;
 957
 958         /* validate negotiate successful */
 959         rc = 0;
 960         cifs_dbg(FYI, "validate negotiate info successful\n");
 961         goto out_free_rsp;
 962
 963 vneg_out:
 964         cifs_dbg(VFS, "protocol revalidation - security settings mismatch\n");
 965 out_free_rsp:
 966         kfree(pneg_rsp);
 967 out_free_inbuf:
 968         kfree(pneg_inbuf);
 969         return rc;
 970 }
 971
 972 enum securityEnum
 973 smb2_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
 974 {
 975         switch (requested) {
 976         case Kerberos:
 977         case RawNTLMSSP:
 978                 return requested;
 979         case NTLMv2:
 980                 return RawNTLMSSP;
 981         case Unspecified:
 982                 if (server->sec_ntlmssp &&
 983                         (global_secflags & CIFSSEC_MAY_NTLMSSP))
 984                         return RawNTLMSSP;
 985                 if ((server->sec_kerberos || server->sec_mskerberos) &&
 986                         (global_secflags & CIFSSEC_MAY_KRB5))
 987                         return Kerberos;
 988                 /* Fallthrough */
 989         default:
 990                 return Unspecified;
 991         }
 992 }
 993
 994 struct SMB2_sess_data {
 995         unsigned int xid;
 996         struct cifs_ses *ses;
 997         struct nls_table *nls_cp;
 998         void (*func)(struct SMB2_sess_data *);
 999         int result;
1000         u64 previous_session;
1001
1002         /* we will send the SMB in three pieces:
1003          * a fixed length beginning part, an optional
1004          * SPNEGO blob (which can be zero length), and a
1005          * last part which will include the strings
1006          * and rest of bcc area. This allows us to avoid
1007          * a large buffer 17K allocation
1008          */
1009         int buf0_type;
1010         struct kvec iov[2];
1011 };
1012
1013 static int
1014 SMB2_sess_alloc_buffer(struct SMB2_sess_data *sess_data)
1015 {
1016         int rc;
1017         struct cifs_ses *ses = sess_data->ses;
1018         struct smb2_sess_setup_req *req;
1019         struct TCP_Server_Info *server = ses->server;
1020         unsigned int total_len;
1021
1022         rc = smb2_plain_req_init(SMB2_SESSION_SETUP, NULL, (void **) &req,
1023                              &total_len);
1024         if (rc)
1025                 return rc;
1026
1027         /* First session, not a reauthenticate */
1028         req->sync_hdr.SessionId = 0;
1029
1030         /* if reconnect, we need to send previous sess id, otherwise it is 0 */
1031         req->PreviousSessionId = sess_data->previous_session;
1032
1033         req->Flags = 0; /* MBZ */
1034
1035         /* enough to enable echos and oplocks and one max size write */
1036         req->sync_hdr.CreditRequest = cpu_to_le16(130);
1037
1038         /* only one of SMB2 signing flags may be set in SMB2 request */
1039         if (server->sign)
1040                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_REQUIRED;
1041         else if (global_secflags & CIFSSEC_MAY_SIGN) /* one flag unlike MUST_ */
1042                 req->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED;
1043         else
1044                 req->SecurityMode = 0;
1045
1046 #ifdef CONFIG_CIFS_DFS_UPCALL
1047         req->Capabilities = cpu_to_le32(SMB2_GLOBAL_CAP_DFS);
1048 #else
1049         req->Capabilities = 0;
1050 #endif /* DFS_UPCALL */
1051
1052         req->Channel = 0; /* MBZ */
1053
1054         sess_data->iov[0].iov_base = (char *)req;
1055         /* 1 for pad */
1056         sess_data->iov[0].iov_len = total_len - 1;
1057         /*
1058          * This variable will be used to clear the buffer
1059          * allocated above in case of any error in the calling function.
1060          */
1061         sess_data->buf0_type = CIFS_SMALL_BUFFER;
1062
1063         return 0;
1064 }
1065
1066 static void
1067 SMB2_sess_free_buffer(struct SMB2_sess_data *sess_data)
1068 {
1069         free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base);
1070         sess_data->buf0_type = CIFS_NO_BUFFER;
1071 }
1072
1073 static int
1074 SMB2_sess_sendreceive(struct SMB2_sess_data *sess_data)
1075 {
1076         int rc;
1077         struct smb_rqst rqst;
1078         struct smb2_sess_setup_req *req = sess_data->iov[0].iov_base;
1079         struct kvec rsp_iov = { NULL, 0 };
1080
1081         /* Testing shows that buffer offset must be at location of Buffer[0] */
1082         req->SecurityBufferOffset =
1083                 cpu_to_le16(sizeof(struct smb2_sess_setup_req) - 1 /* pad */);
1084         req->SecurityBufferLength = cpu_to_le16(sess_data->iov[1].iov_len);
1085
1086         memset(&rqst, 0, sizeof(struct smb_rqst));
1087         rqst.rq_iov = sess_data->iov;
1088         rqst.rq_nvec = 2;
1089
1090         /* BB add code to build os and lm fields */
1091         rc = cifs_send_recv(sess_data->xid, sess_data->ses,
1092                             &rqst,
1093                             &sess_data->buf0_type,
1094                             CIFS_LOG_ERROR | CIFS_NEG_OP, &rsp_iov);
1095         cifs_small_buf_release(sess_data->iov[0].iov_base);
1096         memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
1097
1098         return rc;
1099 }
1100
1101 static int
1102 SMB2_sess_establish_session(struct SMB2_sess_data *sess_data)
1103 {
1104         int rc = 0;
1105         struct cifs_ses *ses = sess_data->ses;
1106
1107         mutex_lock(&ses->server->srv_mutex);
1108         if (ses->server->ops->generate_signingkey) {
1109                 rc = ses->server->ops->generate_signingkey(ses);
1110                 if (rc) {
1111                         cifs_dbg(FYI,
1112                                 "SMB3 session key generation failed\n");
1113                         mutex_unlock(&ses->server->srv_mutex);
1114                         return rc;
1115                 }
1116         }
1117         if (!ses->server->session_estab) {
1118                 ses->server->sequence_number = 0x2;
1119                 ses->server->session_estab = true;
1120         }
1121         mutex_unlock(&ses->server->srv_mutex);
1122
1123         cifs_dbg(FYI, "SMB2/3 session established successfully\n");
1124         spin_lock(&GlobalMid_Lock);
1125         ses->status = CifsGood;
1126         ses->need_reconnect = false;
1127         spin_unlock(&GlobalMid_Lock);
1128         return rc;
1129 }
1130
1131 #ifdef CONFIG_CIFS_UPCALL
1132 static void
1133 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1134 {
1135         int rc;
1136         struct cifs_ses *ses = sess_data->ses;
1137         struct cifs_spnego_msg *msg;
1138         struct key *spnego_key = NULL;
1139         struct smb2_sess_setup_rsp *rsp = NULL;
1140
1141         rc = SMB2_sess_alloc_buffer(sess_data);
1142         if (rc)
1143                 goto out;
1144
1145         spnego_key = cifs_get_spnego_key(ses);
1146         if (IS_ERR(spnego_key)) {
1147                 rc = PTR_ERR(spnego_key);
1148                 if (rc == -ENOKEY)
1149                         cifs_dbg(VFS, "Verify user has a krb5 ticket and keyutils is installed\n");
1150                 spnego_key = NULL;
1151                 goto out;
1152         }
1153
1154         msg = spnego_key->payload.data[0];
1155         /*
1156          * check version field to make sure that cifs.upcall is
1157          * sending us a response in an expected form
1158          */
1159         if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
1160                 cifs_dbg(VFS,
1161                           "bad cifs.upcall version. Expected %d got %d",
1162                           CIFS_SPNEGO_UPCALL_VERSION, msg->version);
1163                 rc = -EKEYREJECTED;
1164                 goto out_put_spnego_key;
1165         }
1166
1167         ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
1168                                          GFP_KERNEL);
1169         if (!ses->auth_key.response) {
1170                 cifs_dbg(VFS,
1171                         "Kerberos can't allocate (%u bytes) memory",
1172                         msg->sesskey_len);
1173                 rc = -ENOMEM;
1174                 goto out_put_spnego_key;
1175         }
1176         ses->auth_key.len = msg->sesskey_len;
1177
1178         sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
1179         sess_data->iov[1].iov_len = msg->secblob_len;
1180
1181         rc = SMB2_sess_sendreceive(sess_data);
1182         if (rc)
1183                 goto out_put_spnego_key;
1184
1185         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1186         ses->Suid = rsp->sync_hdr.SessionId;
1187
1188         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1189
1190         rc = SMB2_sess_establish_session(sess_data);
1191 out_put_spnego_key:
1192         key_invalidate(spnego_key);
1193         key_put(spnego_key);
1194 out:
1195         sess_data->result = rc;
1196         sess_data->func = NULL;
1197         SMB2_sess_free_buffer(sess_data);
1198 }
1199 #else
1200 static void
1201 SMB2_auth_kerberos(struct SMB2_sess_data *sess_data)
1202 {
1203         cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
1204         sess_data->result = -EOPNOTSUPP;
1205         sess_data->func = NULL;
1206 }
1207 #endif
1208
1209 static void
1210 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data);
1211
1212 static void
1213 SMB2_sess_auth_rawntlmssp_negotiate(struct SMB2_sess_data *sess_data)
1214 {
1215         int rc;
1216         struct cifs_ses *ses = sess_data->ses;
1217         struct smb2_sess_setup_rsp *rsp = NULL;
1218         char *ntlmssp_blob = NULL;
1219         bool use_spnego = false; /* else use raw ntlmssp */
1220         u16 blob_length = 0;
1221
1222         /*
1223          * If memory allocation is successful, caller of this function
1224          * frees it.
1225          */
1226         ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
1227         if (!ses->ntlmssp) {
1228                 rc = -ENOMEM;
1229                 goto out_err;
1230         }
1231         ses->ntlmssp->sesskey_per_smbsess = true;
1232
1233         rc = SMB2_sess_alloc_buffer(sess_data);
1234         if (rc)
1235                 goto out_err;
1236
1237         ntlmssp_blob = kmalloc(sizeof(struct _NEGOTIATE_MESSAGE),
1238                                GFP_KERNEL);
1239         if (ntlmssp_blob == NULL) {
1240                 rc = -ENOMEM;
1241                 goto out;
1242         }
1243
1244         build_ntlmssp_negotiate_blob(ntlmssp_blob, ses);
1245         if (use_spnego) {
1246                 /* BB eventually need to add this */
1247                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1248                 rc = -EOPNOTSUPP;
1249                 goto out;
1250         } else {
1251                 blob_length = sizeof(struct _NEGOTIATE_MESSAGE);
1252                 /* with raw NTLMSSP we don't encapsulate in SPNEGO */
1253         }
1254         sess_data->iov[1].iov_base = ntlmssp_blob;
1255         sess_data->iov[1].iov_len = blob_length;
1256
1257         rc = SMB2_sess_sendreceive(sess_data);
1258         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1259
1260         /* If true, rc here is expected and not an error */
1261         if (sess_data->buf0_type != CIFS_NO_BUFFER &&
1262                 rsp->sync_hdr.Status == STATUS_MORE_PROCESSING_REQUIRED)
1263                 rc = 0;
1264
1265         if (rc)
1266                 goto out;
1267
1268         if (offsetof(struct smb2_sess_setup_rsp, Buffer) !=
1269                         le16_to_cpu(rsp->SecurityBufferOffset)) {
1270                 cifs_dbg(VFS, "Invalid security buffer offset %d\n",
1271                         le16_to_cpu(rsp->SecurityBufferOffset));
1272                 rc = -EIO;
1273                 goto out;
1274         }
1275         rc = decode_ntlmssp_challenge(rsp->Buffer,
1276                         le16_to_cpu(rsp->SecurityBufferLength), ses);
1277         if (rc)
1278                 goto out;
1279
1280         cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
1281
1282
1283         ses->Suid = rsp->sync_hdr.SessionId;
1284         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1285
1286 out:
1287         kfree(ntlmssp_blob);
1288         SMB2_sess_free_buffer(sess_data);
1289         if (!rc) {
1290                 sess_data->result = 0;
1291                 sess_data->func = SMB2_sess_auth_rawntlmssp_authenticate;
1292                 return;
1293         }
1294 out_err:
1295         kfree(ses->ntlmssp);
1296         ses->ntlmssp = NULL;
1297         sess_data->result = rc;
1298         sess_data->func = NULL;
1299 }
1300
1301 static void
1302 SMB2_sess_auth_rawntlmssp_authenticate(struct SMB2_sess_data *sess_data)
1303 {
1304         int rc;
1305         struct cifs_ses *ses = sess_data->ses;
1306         struct smb2_sess_setup_req *req;
1307         struct smb2_sess_setup_rsp *rsp = NULL;
1308         unsigned char *ntlmssp_blob = NULL;
1309         bool use_spnego = false; /* else use raw ntlmssp */
1310         u16 blob_length = 0;
1311
1312         rc = SMB2_sess_alloc_buffer(sess_data);
1313         if (rc)
1314                 goto out;
1315
1316         req = (struct smb2_sess_setup_req *) sess_data->iov[0].iov_base;
1317         req->sync_hdr.SessionId = ses->Suid;
1318
1319         rc = build_ntlmssp_auth_blob(&ntlmssp_blob, &blob_length, ses,
1320                                         sess_data->nls_cp);
1321         if (rc) {
1322                 cifs_dbg(FYI, "build_ntlmssp_auth_blob failed %d\n", rc);
1323                 goto out;
1324         }
1325
1326         if (use_spnego) {
1327                 /* BB eventually need to add this */
1328                 cifs_dbg(VFS, "spnego not supported for SMB2 yet\n");
1329                 rc = -EOPNOTSUPP;
1330                 goto out;
1331         }
1332         sess_data->iov[1].iov_base = ntlmssp_blob;
1333         sess_data->iov[1].iov_len = blob_length;
1334
1335         rc = SMB2_sess_sendreceive(sess_data);
1336         if (rc)
1337                 goto out;
1338
1339         rsp = (struct smb2_sess_setup_rsp *)sess_data->iov[0].iov_base;
1340
1341         ses->Suid = rsp->sync_hdr.SessionId;
1342         ses->session_flags = le16_to_cpu(rsp->SessionFlags);
1343
1344         rc = SMB2_sess_establish_session(sess_data);
1345 out:
1346         kfree(ntlmssp_blob);
1347         SMB2_sess_free_buffer(sess_data);
1348         kfree(ses->ntlmssp);
1349         ses->ntlmssp = NULL;
1350         sess_data->result = rc;
1351         sess_data->func = NULL;
1352 }
1353
1354 static int
1355 SMB2_select_sec(struct cifs_ses *ses, struct SMB2_sess_data *sess_data)
1356 {
1357         int type;
1358
1359         type = smb2_select_sectype(ses->server, ses->sectype);
1360         cifs_dbg(FYI, "sess setup type %d\n", type);
1361         if (type == Unspecified) {
1362                 cifs_dbg(VFS,
1363                         "Unable to select appropriate authentication method!");
1364                 return -EINVAL;
1365         }
1366
1367         switch (type) {
1368         case Kerberos:
1369                 sess_data->func = SMB2_auth_kerberos;
1370                 break;
1371         case RawNTLMSSP:
1372                 sess_data->func = SMB2_sess_auth_rawntlmssp_negotiate;
1373                 break;
1374         default:
1375                 cifs_dbg(VFS, "secType %d not supported!\n", type);
1376                 return -EOPNOTSUPP;
1377         }
1378
1379         return 0;
1380 }
1381
1382 int
1383 SMB2_sess_setup(const unsigned int xid, struct cifs_ses *ses,
1384                 const struct nls_table *nls_cp)
1385 {
1386         int rc = 0;
1387         struct TCP_Server_Info *server = ses->server;
1388         struct SMB2_sess_data *sess_data;
1389
1390         cifs_dbg(FYI, "Session Setup\n");
1391
1392         if (!server) {
1393                 WARN(1, "%s: server is NULL!\n", __func__);
1394                 return -EIO;
1395         }
1396
1397         sess_data = kzalloc(sizeof(struct SMB2_sess_data), GFP_KERNEL);
1398         if (!sess_data)
1399                 return -ENOMEM;
1400
1401         rc = SMB2_select_sec(ses, sess_data);
1402         if (rc)
1403                 goto out;
1404         sess_data->xid = xid;
1405         sess_data->ses = ses;
1406         sess_data->buf0_type = CIFS_NO_BUFFER;
1407         sess_data->nls_cp = (struct nls_table *) nls_cp;
1408         sess_data->previous_session = ses->Suid;
1409
1410         /*
1411          * Initialize the session hash with the server one.
1412          */
1413         memcpy(ses->preauth_sha_hash, ses->server->preauth_sha_hash,
1414                SMB2_PREAUTH_HASH_SIZE);
1415
1416         while (sess_data->func)
1417                 sess_data->func(sess_data);
1418
1419         if ((ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST) && (ses->sign))
1420                 cifs_dbg(VFS, "signing requested but authenticated as guest\n");
1421         rc = sess_data->result;
1422 out:
1423         kfree(sess_data);
1424         return rc;
1425 }
1426
1427 int
1428 SMB2_logoff(const unsigned int xid, struct cifs_ses *ses)
1429 {
1430         struct smb_rqst rqst;
1431         struct smb2_logoff_req *req; /* response is also trivial struct */
1432         int rc = 0;
1433         struct TCP_Server_Info *server;
1434         int flags = 0;
1435         unsigned int total_len;
1436         struct kvec iov[1];
1437         struct kvec rsp_iov;
1438         int resp_buf_type;
1439
1440         cifs_dbg(FYI, "disconnect session %p\n", ses);
1441
1442         if (ses && (ses->server))
1443                 server = ses->server;
1444         else
1445                 return -EIO;
1446
1447         /* no need to send SMB logoff if uid already closed due to reconnect */
1448         if (ses->need_reconnect)
1449                 goto smb2_session_already_dead;
1450
1451         rc = smb2_plain_req_init(SMB2_LOGOFF, NULL, (void **) &req, &total_len);
1452         if (rc)
1453                 return rc;
1454
1455          /* since no tcon, smb2_init can not do this, so do here */
1456         req->sync_hdr.SessionId = ses->Suid;
1457
1458         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA)
1459                 flags |= CIFS_TRANSFORM_REQ;
1460         else if (server->sign)
1461                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1462
1463         flags |= CIFS_NO_RESP;
1464
1465         iov[0].iov_base = (char *)req;
1466         iov[0].iov_len = total_len;
1467
1468         memset(&rqst, 0, sizeof(struct smb_rqst));
1469         rqst.rq_iov = iov;
1470         rqst.rq_nvec = 1;
1471
1472         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1473         cifs_small_buf_release(req);
1474         /*
1475          * No tcon so can't do
1476          * cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[SMB2...]);
1477          */
1478
1479 smb2_session_already_dead:
1480         return rc;
1481 }
1482
1483 static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
1484 {
1485         cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_failed[code]);
1486 }
1487
1488 #define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
1489
1490 /* These are similar values to what Windows uses */
1491 static inline void init_copy_chunk_defaults(struct cifs_tcon *tcon)
1492 {
1493         tcon->max_chunks = 256;
1494         tcon->max_bytes_chunk = 1048576;
1495         tcon->max_bytes_copy = 16777216;
1496 }
1497
1498 int
1499 SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
1500           struct cifs_tcon *tcon, const struct nls_table *cp)
1501 {
1502         struct smb_rqst rqst;
1503         struct smb2_tree_connect_req *req;
1504         struct smb2_tree_connect_rsp *rsp = NULL;
1505         struct kvec iov[2];
1506         struct kvec rsp_iov = { NULL, 0 };
1507         int rc = 0;
1508         int resp_buftype;
1509         int unc_path_len;
1510         __le16 *unc_path = NULL;
1511         int flags = 0;
1512         unsigned int total_len;
1513
1514         cifs_dbg(FYI, "TCON\n");
1515
1516         if (!(ses->server) || !tree)
1517                 return -EIO;
1518
1519         unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
1520         if (unc_path == NULL)
1521                 return -ENOMEM;
1522
1523         unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
1524         unc_path_len *= 2;
1525         if (unc_path_len < 2) {
1526                 kfree(unc_path);
1527                 return -EINVAL;
1528         }
1529
1530         /* SMB2 TREE_CONNECT request must be called with TreeId == 0 */
1531         tcon->tid = 0;
1532
1533         rc = smb2_plain_req_init(SMB2_TREE_CONNECT, tcon, (void **) &req,
1534                              &total_len);
1535         if (rc) {
1536                 kfree(unc_path);
1537                 return rc;
1538         }
1539
1540         if (smb3_encryption_required(tcon))
1541                 flags |= CIFS_TRANSFORM_REQ;
1542
1543         iov[0].iov_base = (char *)req;
1544         /* 1 for pad */
1545         iov[0].iov_len = total_len - 1;
1546
1547         /* Testing shows that buffer offset must be at location of Buffer[0] */
1548         req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
1549                         - 1 /* pad */);
1550         req->PathLength = cpu_to_le16(unc_path_len - 2);
1551         iov[1].iov_base = unc_path;
1552         iov[1].iov_len = unc_path_len;
1553
1554         /*
1555          * 3.11 tcon req must be signed if not encrypted. See MS-SMB2 3.2.4.1.1
1556          * unless it is guest or anonymous user. See MS-SMB2 3.2.5.3.1
1557          * (Samba servers don't always set the flag so also check if null user)
1558          */
1559         if ((ses->server->dialect == SMB311_PROT_ID) &&
1560             !smb3_encryption_required(tcon) &&
1561             !(ses->session_flags &
1562                     (SMB2_SESSION_FLAG_IS_GUEST|SMB2_SESSION_FLAG_IS_NULL)) &&
1563             ((ses->user_name != NULL) || (ses->sectype == Kerberos)))
1564                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
1565
1566         memset(&rqst, 0, sizeof(struct smb_rqst));
1567         rqst.rq_iov = iov;
1568         rqst.rq_nvec = 2;
1569
1570         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
1571         cifs_small_buf_release(req);
1572         rsp = (struct smb2_tree_connect_rsp *)rsp_iov.iov_base;
1573
1574         if (rc != 0) {
1575                 if (tcon) {
1576                         cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
1577                         tcon->need_reconnect = true;
1578                 }
1579                 goto tcon_error_exit;
1580         }
1581
1582         switch (rsp->ShareType) {
1583         case SMB2_SHARE_TYPE_DISK:
1584                 cifs_dbg(FYI, "connection to disk share\n");
1585                 break;
1586         case SMB2_SHARE_TYPE_PIPE:
1587                 tcon->pipe = true;
1588                 cifs_dbg(FYI, "connection to pipe share\n");
1589                 break;
1590         case SMB2_SHARE_TYPE_PRINT:
1591                 tcon->print = true;
1592                 cifs_dbg(FYI, "connection to printer\n");
1593                 break;
1594         default:
1595                 cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
1596                 rc = -EOPNOTSUPP;
1597                 goto tcon_error_exit;
1598         }
1599
1600         tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
1601         tcon->capabilities = rsp->Capabilities; /* we keep caps little endian */
1602         tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
1603         tcon->tidStatus = CifsGood;
1604         tcon->need_reconnect = false;
1605         tcon->tid = rsp->sync_hdr.TreeId;
1606         strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
1607
1608         if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
1609             ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
1610                 cifs_dbg(VFS, "DFS capability contradicts DFS flag\n");
1611
1612         if (tcon->seal &&
1613             !(tcon->ses->server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION))
1614                 cifs_dbg(VFS, "Encryption is requested but not supported\n");
1615
1616         init_copy_chunk_defaults(tcon);
1617         if (tcon->ses->server->ops->validate_negotiate)
1618                 rc = tcon->ses->server->ops->validate_negotiate(xid, tcon);
1619 tcon_exit:
1620         free_rsp_buf(resp_buftype, rsp);
1621         kfree(unc_path);
1622         return rc;
1623
1624 tcon_error_exit:
1625         if (rsp && rsp->sync_hdr.Status == STATUS_BAD_NETWORK_NAME) {
1626                 cifs_dbg(VFS, "BAD_NETWORK_NAME: %s\n", tree);
1627         }
1628         goto tcon_exit;
1629 }
1630
1631 int
1632 SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
1633 {
1634         struct smb_rqst rqst;
1635         struct smb2_tree_disconnect_req *req; /* response is trivial */
1636         int rc = 0;
1637         struct cifs_ses *ses = tcon->ses;
1638         int flags = 0;
1639         unsigned int total_len;
1640         struct kvec iov[1];
1641         struct kvec rsp_iov;
1642         int resp_buf_type;
1643
1644         cifs_dbg(FYI, "Tree Disconnect\n");
1645
1646         if (!ses || !(ses->server))
1647                 return -EIO;
1648
1649         if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
1650                 return 0;
1651
1652         rc = smb2_plain_req_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req,
1653                              &total_len);
1654         if (rc)
1655                 return rc;
1656
1657         if (smb3_encryption_required(tcon))
1658                 flags |= CIFS_TRANSFORM_REQ;
1659
1660         flags |= CIFS_NO_RESP;
1661
1662         iov[0].iov_base = (char *)req;
1663         iov[0].iov_len = total_len;
1664
1665         memset(&rqst, 0, sizeof(struct smb_rqst));
1666         rqst.rq_iov = iov;
1667         rqst.rq_nvec = 1;
1668
1669         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
1670         cifs_small_buf_release(req);
1671         if (rc)
1672                 cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
1673
1674         return rc;
1675 }
1676
1677
1678 static struct create_durable *
1679 create_durable_buf(void)
1680 {
1681         struct create_durable *buf;
1682
1683         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1684         if (!buf)
1685                 return NULL;
1686
1687         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1688                                         (struct create_durable, Data));
1689         buf->ccontext.DataLength = cpu_to_le32(16);
1690         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1691                                 (struct create_durable, Name));
1692         buf->ccontext.NameLength = cpu_to_le16(4);
1693         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DHnQ" */
1694         buf->Name[0] = 'D';
1695         buf->Name[1] = 'H';
1696         buf->Name[2] = 'n';
1697         buf->Name[3] = 'Q';
1698         return buf;
1699 }
1700
1701 static struct create_durable *
1702 create_reconnect_durable_buf(struct cifs_fid *fid)
1703 {
1704         struct create_durable *buf;
1705
1706         buf = kzalloc(sizeof(struct create_durable), GFP_KERNEL);
1707         if (!buf)
1708                 return NULL;
1709
1710         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1711                                         (struct create_durable, Data));
1712         buf->ccontext.DataLength = cpu_to_le32(16);
1713         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1714                                 (struct create_durable, Name));
1715         buf->ccontext.NameLength = cpu_to_le16(4);
1716         buf->Data.Fid.PersistentFileId = fid->persistent_fid;
1717         buf->Data.Fid.VolatileFileId = fid->volatile_fid;
1718         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT is "DHnC" */
1719         buf->Name[0] = 'D';
1720         buf->Name[1] = 'H';
1721         buf->Name[2] = 'n';
1722         buf->Name[3] = 'C';
1723         return buf;
1724 }
1725
1726 static __u8
1727 parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
1728                   unsigned int *epoch, char *lease_key)
1729 {
1730         char *data_offset;
1731         struct create_context *cc;
1732         unsigned int next;
1733         unsigned int remaining;
1734         char *name;
1735
1736         data_offset = (char *)rsp + le32_to_cpu(rsp->CreateContextsOffset);
1737         remaining = le32_to_cpu(rsp->CreateContextsLength);
1738         cc = (struct create_context *)data_offset;
1739         while (remaining >= sizeof(struct create_context)) {
1740                 name = le16_to_cpu(cc->NameOffset) + (char *)cc;
1741                 if (le16_to_cpu(cc->NameLength) == 4 &&
1742                     strncmp(name, "RqLs", 4) == 0)
1743                         return server->ops->parse_lease_buf(cc, epoch,
1744                                                             lease_key);
1745
1746                 next = le32_to_cpu(cc->Next);
1747                 if (!next)
1748                         break;
1749                 remaining -= next;
1750                 cc = (struct create_context *)((char *)cc + next);
1751         }
1752
1753         return 0;
1754 }
1755
1756 static int
1757 add_lease_context(struct TCP_Server_Info *server, struct kvec *iov,
1758                   unsigned int *num_iovec, u8 *lease_key, __u8 *oplock)
1759 {
1760         struct smb2_create_req *req = iov[0].iov_base;
1761         unsigned int num = *num_iovec;
1762
1763         iov[num].iov_base = server->ops->create_lease_buf(lease_key, *oplock);
1764         if (iov[num].iov_base == NULL)
1765                 return -ENOMEM;
1766         iov[num].iov_len = server->vals->create_lease_size;
1767         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
1768         if (!req->CreateContextsOffset)
1769                 req->CreateContextsOffset = cpu_to_le32(
1770                                 sizeof(struct smb2_create_req) +
1771                                 iov[num - 1].iov_len);
1772         le32_add_cpu(&req->CreateContextsLength,
1773                      server->vals->create_lease_size);
1774         *num_iovec = num + 1;
1775         return 0;
1776 }
1777
1778 static struct create_durable_v2 *
1779 create_durable_v2_buf(struct cifs_fid *pfid)
1780 {
1781         struct create_durable_v2 *buf;
1782
1783         buf = kzalloc(sizeof(struct create_durable_v2), GFP_KERNEL);
1784         if (!buf)
1785                 return NULL;
1786
1787         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1788                                         (struct create_durable_v2, dcontext));
1789         buf->ccontext.DataLength = cpu_to_le32(sizeof(struct durable_context_v2));
1790         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1791                                 (struct create_durable_v2, Name));
1792         buf->ccontext.NameLength = cpu_to_le16(4);
1793
1794         buf->dcontext.Timeout = 0; /* Should this be configurable by workload */
1795         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1796         generate_random_uuid(buf->dcontext.CreateGuid);
1797         memcpy(pfid->create_guid, buf->dcontext.CreateGuid, 16);
1798
1799         /* SMB2_CREATE_DURABLE_HANDLE_REQUEST is "DH2Q" */
1800         buf->Name[0] = 'D';
1801         buf->Name[1] = 'H';
1802         buf->Name[2] = '2';
1803         buf->Name[3] = 'Q';
1804         return buf;
1805 }
1806
1807 static struct create_durable_handle_reconnect_v2 *
1808 create_reconnect_durable_v2_buf(struct cifs_fid *fid)
1809 {
1810         struct create_durable_handle_reconnect_v2 *buf;
1811
1812         buf = kzalloc(sizeof(struct create_durable_handle_reconnect_v2),
1813                         GFP_KERNEL);
1814         if (!buf)
1815                 return NULL;
1816
1817         buf->ccontext.DataOffset =
1818                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1819                                      dcontext));
1820         buf->ccontext.DataLength =
1821                 cpu_to_le32(sizeof(struct durable_reconnect_context_v2));
1822         buf->ccontext.NameOffset =
1823                 cpu_to_le16(offsetof(struct create_durable_handle_reconnect_v2,
1824                             Name));
1825         buf->ccontext.NameLength = cpu_to_le16(4);
1826
1827         buf->dcontext.Fid.PersistentFileId = fid->persistent_fid;
1828         buf->dcontext.Fid.VolatileFileId = fid->volatile_fid;
1829         buf->dcontext.Flags = cpu_to_le32(SMB2_DHANDLE_FLAG_PERSISTENT);
1830         memcpy(buf->dcontext.CreateGuid, fid->create_guid, 16);
1831
1832         /* SMB2_CREATE_DURABLE_HANDLE_RECONNECT_V2 is "DH2C" */
1833         buf->Name[0] = 'D';
1834         buf->Name[1] = 'H';
1835         buf->Name[2] = '2';
1836         buf->Name[3] = 'C';
1837         return buf;
1838 }
1839
1840 static int
1841 add_durable_v2_context(struct kvec *iov, unsigned int *num_iovec,
1842                     struct cifs_open_parms *oparms)
1843 {
1844         struct smb2_create_req *req = iov[0].iov_base;
1845         unsigned int num = *num_iovec;
1846
1847         iov[num].iov_base = create_durable_v2_buf(oparms->fid);
1848         if (iov[num].iov_base == NULL)
1849                 return -ENOMEM;
1850         iov[num].iov_len = sizeof(struct create_durable_v2);
1851         if (!req->CreateContextsOffset)
1852                 req->CreateContextsOffset =
1853                         cpu_to_le32(sizeof(struct smb2_create_req) +
1854                                                                 iov[1].iov_len);
1855         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable_v2));
1856         *num_iovec = num + 1;
1857         return 0;
1858 }
1859
1860 static int
1861 add_durable_reconnect_v2_context(struct kvec *iov, unsigned int *num_iovec,
1862                     struct cifs_open_parms *oparms)
1863 {
1864         struct smb2_create_req *req = iov[0].iov_base;
1865         unsigned int num = *num_iovec;
1866
1867         /* indicate that we don't need to relock the file */
1868         oparms->reconnect = false;
1869
1870         iov[num].iov_base = create_reconnect_durable_v2_buf(oparms->fid);
1871         if (iov[num].iov_base == NULL)
1872                 return -ENOMEM;
1873         iov[num].iov_len = sizeof(struct create_durable_handle_reconnect_v2);
1874         if (!req->CreateContextsOffset)
1875                 req->CreateContextsOffset =
1876                         cpu_to_le32(sizeof(struct smb2_create_req) +
1877                                                                 iov[1].iov_len);
1878         le32_add_cpu(&req->CreateContextsLength,
1879                         sizeof(struct create_durable_handle_reconnect_v2));
1880         *num_iovec = num + 1;
1881         return 0;
1882 }
1883
1884 static int
1885 add_durable_context(struct kvec *iov, unsigned int *num_iovec,
1886                     struct cifs_open_parms *oparms, bool use_persistent)
1887 {
1888         struct smb2_create_req *req = iov[0].iov_base;
1889         unsigned int num = *num_iovec;
1890
1891         if (use_persistent) {
1892                 if (oparms->reconnect)
1893                         return add_durable_reconnect_v2_context(iov, num_iovec,
1894                                                                 oparms);
1895                 else
1896                         return add_durable_v2_context(iov, num_iovec, oparms);
1897         }
1898
1899         if (oparms->reconnect) {
1900                 iov[num].iov_base = create_reconnect_durable_buf(oparms->fid);
1901                 /* indicate that we don't need to relock the file */
1902                 oparms->reconnect = false;
1903         } else
1904                 iov[num].iov_base = create_durable_buf();
1905         if (iov[num].iov_base == NULL)
1906                 return -ENOMEM;
1907         iov[num].iov_len = sizeof(struct create_durable);
1908         if (!req->CreateContextsOffset)
1909                 req->CreateContextsOffset =
1910                         cpu_to_le32(sizeof(struct smb2_create_req) +
1911                                                                 iov[1].iov_len);
1912         le32_add_cpu(&req->CreateContextsLength, sizeof(struct create_durable));
1913         *num_iovec = num + 1;
1914         return 0;
1915 }
1916
1917 /* See MS-SMB2 2.2.13.2.7 */
1918 static struct crt_twarp_ctxt *
1919 create_twarp_buf(__u64 timewarp)
1920 {
1921         struct crt_twarp_ctxt *buf;
1922
1923         buf = kzalloc(sizeof(struct crt_twarp_ctxt), GFP_KERNEL);
1924         if (!buf)
1925                 return NULL;
1926
1927         buf->ccontext.DataOffset = cpu_to_le16(offsetof
1928                                         (struct crt_twarp_ctxt, Timestamp));
1929         buf->ccontext.DataLength = cpu_to_le32(8);
1930         buf->ccontext.NameOffset = cpu_to_le16(offsetof
1931                                 (struct crt_twarp_ctxt, Name));
1932         buf->ccontext.NameLength = cpu_to_le16(4);
1933         /* SMB2_CREATE_TIMEWARP_TOKEN is "TWrp" */
1934         buf->Name[0] = 'T';
1935         buf->Name[1] = 'W';
1936         buf->Name[2] = 'r';
1937         buf->Name[3] = 'p';
1938         buf->Timestamp = cpu_to_le64(timewarp);
1939         return buf;
1940 }
1941
1942 /* See MS-SMB2 2.2.13.2.7 */
1943 static int
1944 add_twarp_context(struct kvec *iov, unsigned int *num_iovec, __u64 timewarp)
1945 {
1946         struct smb2_create_req *req = iov[0].iov_base;
1947         unsigned int num = *num_iovec;
1948
1949         iov[num].iov_base = create_twarp_buf(timewarp);
1950         if (iov[num].iov_base == NULL)
1951                 return -ENOMEM;
1952         iov[num].iov_len = sizeof(struct crt_twarp_ctxt);
1953         if (!req->CreateContextsOffset)
1954                 req->CreateContextsOffset = cpu_to_le32(
1955                                 sizeof(struct smb2_create_req) +
1956                                 iov[num - 1].iov_len);
1957         le32_add_cpu(&req->CreateContextsLength, sizeof(struct crt_twarp_ctxt));
1958         *num_iovec = num + 1;
1959         return 0;
1960 }
1961
1962 static int
1963 alloc_path_with_tree_prefix(__le16 **out_path, int *out_size, int *out_len,
1964                             const char *treename, const __le16 *path)
1965 {
1966         int treename_len, path_len;
1967         struct nls_table *cp;
1968         const __le16 sep[] = {cpu_to_le16('\\'), cpu_to_le16(0x0000)};
1969
1970         /*
1971          * skip leading "\\"
1972          */
1973         treename_len = strlen(treename);
1974         if (treename_len < 2 || !(treename[0] == '\\' && treename[1] == '\\'))
1975                 return -EINVAL;
1976
1977         treename += 2;
1978         treename_len -= 2;
1979
1980         path_len = UniStrnlen((wchar_t *)path, PATH_MAX);
1981
1982         /*
1983          * make room for one path separator between the treename and
1984          * path
1985          */
1986         *out_len = treename_len + 1 + path_len;
1987
1988         /*
1989          * final path needs to be null-terminated UTF16 with a
1990          * size aligned to 8
1991          */
1992
1993         *out_size = roundup((*out_len+1)*2, 8);
1994         *out_path = kzalloc(*out_size, GFP_KERNEL);
1995         if (!*out_path)
1996                 return -ENOMEM;
1997
1998         cp = load_nls_default();
1999         cifs_strtoUTF16(*out_path, treename, treename_len, cp);
2000         UniStrcat(*out_path, sep);
2001         UniStrcat(*out_path, path);
2002         unload_nls(cp);
2003
2004         return 0;
2005 }
2006
2007 int smb311_posix_mkdir(const unsigned int xid, struct inode *inode,
2008                                umode_t mode, struct cifs_tcon *tcon,
2009                                const char *full_path,
2010                                struct cifs_sb_info *cifs_sb)
2011 {
2012         struct smb_rqst rqst;
2013         struct smb2_create_req *req;
2014         struct smb2_create_rsp *rsp = NULL;
2015         struct TCP_Server_Info *server;
2016         struct cifs_ses *ses = tcon->ses;
2017         struct kvec iov[3]; /* make sure at least one for each open context */
2018         struct kvec rsp_iov = {NULL, 0};
2019         int resp_buftype;
2020         int uni_path_len;
2021         __le16 *copy_path = NULL;
2022         int copy_size;
2023         int rc = 0;
2024         unsigned int n_iov = 2;
2025         __u32 file_attributes = 0;
2026         char *pc_buf = NULL;
2027         int flags = 0;
2028         unsigned int total_len;
2029         __le16 *utf16_path = NULL;
2030
2031         cifs_dbg(FYI, "mkdir\n");
2032
2033         /* resource #1: path allocation */
2034         utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb);
2035         if (!utf16_path)
2036                 return -ENOMEM;
2037
2038         if (ses && (ses->server))
2039                 server = ses->server;
2040         else {
2041                 rc = -EIO;
2042                 goto err_free_path;
2043         }
2044
2045         /* resource #2: request */
2046         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2047         if (rc)
2048                 goto err_free_path;
2049
2050
2051         if (smb3_encryption_required(tcon))
2052                 flags |= CIFS_TRANSFORM_REQ;
2053
2054         req->ImpersonationLevel = IL_IMPERSONATION;
2055         req->DesiredAccess = cpu_to_le32(FILE_WRITE_ATTRIBUTES);
2056         /* File attributes ignored on open (used in create though) */
2057         req->FileAttributes = cpu_to_le32(file_attributes);
2058         req->ShareAccess = FILE_SHARE_ALL_LE;
2059         req->CreateDisposition = cpu_to_le32(FILE_CREATE);
2060         req->CreateOptions = cpu_to_le32(CREATE_NOT_FILE);
2061
2062         iov[0].iov_base = (char *)req;
2063         /* -1 since last byte is buf[0] which is sent below (path) */
2064         iov[0].iov_len = total_len - 1;
2065
2066         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2067
2068         /* [MS-SMB2] 2.2.13 NameOffset:
2069          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2070          * the SMB2 header, the file name includes a prefix that will
2071          * be processed during DFS name normalization as specified in
2072          * section 3.3.5.9. Otherwise, the file name is relative to
2073          * the share that is identified by the TreeId in the SMB2
2074          * header.
2075          */
2076         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2077                 int name_len;
2078
2079                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2080                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2081                                                  &name_len,
2082                                                  tcon->treeName, utf16_path);
2083                 if (rc)
2084                         goto err_free_req;
2085
2086                 req->NameLength = cpu_to_le16(name_len * 2);
2087                 uni_path_len = copy_size;
2088                 /* free before overwriting resource */
2089                 kfree(utf16_path);
2090                 utf16_path = copy_path;
2091         } else {
2092                 uni_path_len = (2 * UniStrnlen((wchar_t *)utf16_path, PATH_MAX)) + 2;
2093                 /* MUST set path len (NameLength) to 0 opening root of share */
2094                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2095                 if (uni_path_len % 8 != 0) {
2096                         copy_size = roundup(uni_path_len, 8);
2097                         copy_path = kzalloc(copy_size, GFP_KERNEL);
2098                         if (!copy_path) {
2099                                 rc = -ENOMEM;
2100                                 goto err_free_req;
2101                         }
2102                         memcpy((char *)copy_path, (const char *)utf16_path,
2103                                uni_path_len);
2104                         uni_path_len = copy_size;
2105                         /* free before overwriting resource */
2106                         kfree(utf16_path);
2107                         utf16_path = copy_path;
2108                 }
2109         }
2110
2111         iov[1].iov_len = uni_path_len;
2112         iov[1].iov_base = utf16_path;
2113         req->RequestedOplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2114
2115         if (tcon->posix_extensions) {
2116                 /* resource #3: posix buf */
2117                 rc = add_posix_context(iov, &n_iov, mode);
2118                 if (rc)
2119                         goto err_free_req;
2120                 pc_buf = iov[n_iov-1].iov_base;
2121         }
2122
2123
2124         memset(&rqst, 0, sizeof(struct smb_rqst));
2125         rqst.rq_iov = iov;
2126         rqst.rq_nvec = n_iov;
2127
2128         /* resource #4: response buffer */
2129         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2130         if (rc) {
2131                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2132                 trace_smb3_posix_mkdir_err(xid, tcon->tid, ses->Suid,
2133                                            CREATE_NOT_FILE,
2134                                            FILE_WRITE_ATTRIBUTES, rc);
2135                 goto err_free_rsp_buf;
2136         }
2137
2138         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2139         trace_smb3_posix_mkdir_done(xid, rsp->PersistentFileId, tcon->tid,
2140                                     ses->Suid, CREATE_NOT_FILE,
2141                                     FILE_WRITE_ATTRIBUTES);
2142
2143         SMB2_close(xid, tcon, rsp->PersistentFileId, rsp->VolatileFileId);
2144
2145         /* Eventually save off posix specific response info and timestaps */
2146
2147 err_free_rsp_buf:
2148         free_rsp_buf(resp_buftype, rsp);
2149         kfree(pc_buf);
2150 err_free_req:
2151         cifs_small_buf_release(req);
2152 err_free_path:
2153         kfree(utf16_path);
2154         return rc;
2155 }
2156
2157 int
2158 SMB2_open_init(struct cifs_tcon *tcon, struct smb_rqst *rqst, __u8 *oplock,
2159                struct cifs_open_parms *oparms, __le16 *path)
2160 {
2161         struct TCP_Server_Info *server = tcon->ses->server;
2162         struct smb2_create_req *req;
2163         unsigned int n_iov = 2;
2164         __u32 file_attributes = 0;
2165         int copy_size;
2166         int uni_path_len;
2167         unsigned int total_len;
2168         struct kvec *iov = rqst->rq_iov;
2169         __le16 *copy_path;
2170         int rc;
2171
2172         rc = smb2_plain_req_init(SMB2_CREATE, tcon, (void **) &req, &total_len);
2173         if (rc)
2174                 return rc;
2175
2176         iov[0].iov_base = (char *)req;
2177         /* -1 since last byte is buf[0] which is sent below (path) */
2178         iov[0].iov_len = total_len - 1;
2179
2180         if (oparms->create_options & CREATE_OPTION_READONLY)
2181                 file_attributes |= ATTR_READONLY;
2182         if (oparms->create_options & CREATE_OPTION_SPECIAL)
2183                 file_attributes |= ATTR_SYSTEM;
2184
2185         req->ImpersonationLevel = IL_IMPERSONATION;
2186         req->DesiredAccess = cpu_to_le32(oparms->desired_access);
2187         /* File attributes ignored on open (used in create though) */
2188         req->FileAttributes = cpu_to_le32(file_attributes);
2189         req->ShareAccess = FILE_SHARE_ALL_LE;
2190         req->CreateDisposition = cpu_to_le32(oparms->disposition);
2191         req->CreateOptions = cpu_to_le32(oparms->create_options & CREATE_OPTIONS_MASK);
2192         req->NameOffset = cpu_to_le16(sizeof(struct smb2_create_req));
2193
2194         /* [MS-SMB2] 2.2.13 NameOffset:
2195          * If SMB2_FLAGS_DFS_OPERATIONS is set in the Flags field of
2196          * the SMB2 header, the file name includes a prefix that will
2197          * be processed during DFS name normalization as specified in
2198          * section 3.3.5.9. Otherwise, the file name is relative to
2199          * the share that is identified by the TreeId in the SMB2
2200          * header.
2201          */
2202         if (tcon->share_flags & SHI1005_FLAGS_DFS) {
2203                 int name_len;
2204
2205                 req->sync_hdr.Flags |= SMB2_FLAGS_DFS_OPERATIONS;
2206                 rc = alloc_path_with_tree_prefix(&copy_path, &copy_size,
2207                                                  &name_len,
2208                                                  tcon->treeName, path);
2209                 if (rc)
2210                         return rc;
2211                 req->NameLength = cpu_to_le16(name_len * 2);
2212                 uni_path_len = copy_size;
2213                 path = copy_path;
2214         } else {
2215                 uni_path_len = (2 * UniStrnlen((wchar_t *)path, PATH_MAX)) + 2;
2216                 /* MUST set path len (NameLength) to 0 opening root of share */
2217                 req->NameLength = cpu_to_le16(uni_path_len - 2);
2218                 copy_size = uni_path_len;
2219                 if (copy_size % 8 != 0)
2220                         copy_size = roundup(copy_size, 8);
2221                 copy_path = kzalloc(copy_size, GFP_KERNEL);
2222                 if (!copy_path)
2223                         return -ENOMEM;
2224                 memcpy((char *)copy_path, (const char *)path,
2225                        uni_path_len);
2226                 uni_path_len = copy_size;
2227                 path = copy_path;
2228         }
2229
2230         iov[1].iov_len = uni_path_len;
2231         iov[1].iov_base = path;
2232
2233         if ((!server->oplocks) || (tcon->no_lease))
2234                 *oplock = SMB2_OPLOCK_LEVEL_NONE;
2235
2236         if (!(server->capabilities & SMB2_GLOBAL_CAP_LEASING) ||
2237             *oplock == SMB2_OPLOCK_LEVEL_NONE)
2238                 req->RequestedOplockLevel = *oplock;
2239         else if (!(server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) &&
2240                   (oparms->create_options & CREATE_NOT_FILE))
2241                 req->RequestedOplockLevel = *oplock; /* no srv lease support */
2242         else {
2243                 rc = add_lease_context(server, iov, &n_iov,
2244                                        oparms->fid->lease_key, oplock);
2245                 if (rc)
2246                         return rc;
2247         }
2248
2249         if (*oplock == SMB2_OPLOCK_LEVEL_BATCH) {
2250                 /* need to set Next field of lease context if we request it */
2251                 if (server->capabilities & SMB2_GLOBAL_CAP_LEASING) {
2252                         struct create_context *ccontext =
2253                             (struct create_context *)iov[n_iov-1].iov_base;
2254                         ccontext->Next =
2255                                 cpu_to_le32(server->vals->create_lease_size);
2256                 }
2257
2258                 rc = add_durable_context(iov, &n_iov, oparms,
2259                                         tcon->use_persistent);
2260                 if (rc)
2261                         return rc;
2262         }
2263
2264         if (tcon->posix_extensions) {
2265                 if (n_iov > 2) {
2266                         struct create_context *ccontext =
2267                             (struct create_context *)iov[n_iov-1].iov_base;
2268                         ccontext->Next =
2269                                 cpu_to_le32(iov[n_iov-1].iov_len);
2270                 }
2271
2272                 rc = add_posix_context(iov, &n_iov, oparms->mode);
2273                 if (rc)
2274                         return rc;
2275         }
2276
2277         if (tcon->snapshot_time) {
2278                 cifs_dbg(FYI, "adding snapshot context\n");
2279                 if (n_iov > 2) {
2280                         struct create_context *ccontext =
2281                             (struct create_context *)iov[n_iov-1].iov_base;
2282                         ccontext->Next =
2283                                 cpu_to_le32(iov[n_iov-1].iov_len);
2284                 }
2285
2286                 rc = add_twarp_context(iov, &n_iov, tcon->snapshot_time);
2287                 if (rc)
2288                         return rc;
2289         }
2290
2291
2292         rqst->rq_nvec = n_iov;
2293         return 0;
2294 }
2295
2296 /* rq_iov[0] is the request and is released by cifs_small_buf_release().
2297  * All other vectors are freed by kfree().
2298  */
2299 void
2300 SMB2_open_free(struct smb_rqst *rqst)
2301 {
2302         int i;
2303
2304         if (rqst && rqst->rq_iov) {
2305                 cifs_small_buf_release(rqst->rq_iov[0].iov_base);
2306                 for (i = 1; i < rqst->rq_nvec; i++)
2307                         if (rqst->rq_iov[i].iov_base != smb2_padding)
2308                                 kfree(rqst->rq_iov[i].iov_base);
2309         }
2310 }
2311
2312 int
2313 SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
2314           __u8 *oplock, struct smb2_file_all_info *buf,
2315           struct kvec *err_iov, int *buftype)
2316 {
2317         struct smb_rqst rqst;
2318         struct smb2_create_rsp *rsp = NULL;
2319         struct TCP_Server_Info *server;
2320         struct cifs_tcon *tcon = oparms->tcon;
2321         struct cifs_ses *ses = tcon->ses;
2322         struct kvec iov[SMB2_CREATE_IOV_SIZE];
2323         struct kvec rsp_iov = {NULL, 0};
2324         int resp_buftype = CIFS_NO_BUFFER;
2325         int rc = 0;
2326         int flags = 0;
2327
2328         cifs_dbg(FYI, "create/open\n");
2329         if (ses && (ses->server))
2330                 server = ses->server;
2331         else
2332                 return -EIO;
2333
2334         if (smb3_encryption_required(tcon))
2335                 flags |= CIFS_TRANSFORM_REQ;
2336
2337         memset(&rqst, 0, sizeof(struct smb_rqst));
2338         memset(&iov, 0, sizeof(iov));
2339         rqst.rq_iov = iov;
2340         rqst.rq_nvec = SMB2_CREATE_IOV_SIZE;
2341
2342         rc = SMB2_open_init(tcon, &rqst, oplock, oparms, path);
2343         if (rc)
2344                 goto creat_exit;
2345
2346         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2347                             &rsp_iov);
2348         rsp = (struct smb2_create_rsp *)rsp_iov.iov_base;
2349
2350         if (rc != 0) {
2351                 cifs_stats_fail_inc(tcon, SMB2_CREATE_HE);
2352                 if (err_iov && rsp) {
2353                         *err_iov = rsp_iov;
2354                         *buftype = resp_buftype;
2355                         resp_buftype = CIFS_NO_BUFFER;
2356                         rsp = NULL;
2357                 }
2358                 trace_smb3_open_err(xid, tcon->tid, ses->Suid,
2359                                     oparms->create_options, oparms->desired_access, rc);
2360                 goto creat_exit;
2361         } else
2362                 trace_smb3_open_done(xid, rsp->PersistentFileId, tcon->tid,
2363                                      ses->Suid, oparms->create_options,
2364                                      oparms->desired_access);
2365
2366         oparms->fid->persistent_fid = rsp->PersistentFileId;
2367         oparms->fid->volatile_fid = rsp->VolatileFileId;
2368
2369         if (buf) {
2370                 memcpy(buf, &rsp->CreationTime, 32);
2371                 buf->AllocationSize = rsp->AllocationSize;
2372                 buf->EndOfFile = rsp->EndofFile;
2373                 buf->Attributes = rsp->FileAttributes;
2374                 buf->NumberOfLinks = cpu_to_le32(1);
2375                 buf->DeletePending = 0;
2376         }
2377
2378         if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
2379                 *oplock = parse_lease_state(server, rsp, &oparms->fid->epoch,
2380                                             oparms->fid->lease_key);
2381         else
2382                 *oplock = rsp->OplockLevel;
2383 creat_exit:
2384         SMB2_open_free(&rqst);
2385         free_rsp_buf(resp_buftype, rsp);
2386         return rc;
2387 }
2388
2389 /*
2390  *      SMB2 IOCTL is used for both IOCTLs and FSCTLs
2391  */
2392 int
2393 SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
2394            u64 volatile_fid, u32 opcode, bool is_fsctl,
2395            char *in_data, u32 indatalen,
2396            char **out_data, u32 *plen /* returned data len */)
2397 {
2398         struct smb_rqst rqst;
2399         struct smb2_ioctl_req *req;
2400         struct smb2_ioctl_rsp *rsp;
2401         struct cifs_ses *ses;
2402         struct kvec iov[2];
2403         struct kvec rsp_iov;
2404         int resp_buftype;
2405         int n_iov;
2406         int rc = 0;
2407         int flags = 0;
2408         unsigned int total_len;
2409
2410         cifs_dbg(FYI, "SMB2 IOCTL\n");
2411
2412         if (out_data != NULL)
2413                 *out_data = NULL;
2414
2415         /* zero out returned data len, in case of error */
2416         if (plen)
2417                 *plen = 0;
2418
2419         if (tcon)
2420                 ses = tcon->ses;
2421         else
2422                 return -EIO;
2423
2424         if (!ses || !(ses->server))
2425                 return -EIO;
2426
2427         rc = smb2_ioctl_req_init(opcode, tcon, (void **) &req, &total_len);
2428         if (rc)
2429                 return rc;
2430
2431         if (smb3_encryption_required(tcon))
2432                 flags |= CIFS_TRANSFORM_REQ;
2433
2434         req->CtlCode = cpu_to_le32(opcode);
2435         req->PersistentFileId = persistent_fid;
2436         req->VolatileFileId = volatile_fid;
2437
2438         if (indatalen) {
2439                 req->InputCount = cpu_to_le32(indatalen);
2440                 /* do not set InputOffset if no input data */
2441                 req->InputOffset =
2442                        cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer));
2443                 iov[1].iov_base = in_data;
2444                 iov[1].iov_len = indatalen;
2445                 n_iov = 2;
2446         } else
2447                 n_iov = 1;
2448
2449         req->OutputOffset = 0;
2450         req->OutputCount = 0; /* MBZ */
2451
2452         /*
2453          * Could increase MaxOutputResponse, but that would require more
2454          * than one credit. Windows typically sets this smaller, but for some
2455          * ioctls it may be useful to allow server to send more. No point
2456          * limiting what the server can send as long as fits in one credit
2457          * Unfortunately - we can not handle more than CIFS_MAX_MSG_SIZE
2458          * (by default, note that it can be overridden to make max larger)
2459          * in responses (except for read responses which can be bigger.
2460          * We may want to bump this limit up
2461          */
2462         req->MaxOutputResponse = cpu_to_le32(CIFSMaxBufSize);
2463
2464         if (is_fsctl)
2465                 req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
2466         else
2467                 req->Flags = 0;
2468
2469         iov[0].iov_base = (char *)req;
2470
2471         /*
2472          * If no input data, the size of ioctl struct in
2473          * protocol spec still includes a 1 byte data buffer,
2474          * but if input data passed to ioctl, we do not
2475          * want to double count this, so we do not send
2476          * the dummy one byte of data in iovec[0] if sending
2477          * input data (in iovec[1]).
2478          */
2479
2480         if (indatalen) {
2481                 iov[0].iov_len = total_len - 1;
2482         } else
2483                 iov[0].iov_len = total_len;
2484
2485         /* validate negotiate request must be signed - see MS-SMB2 3.2.5.5 */
2486         if (opcode == FSCTL_VALIDATE_NEGOTIATE_INFO)
2487                 req->sync_hdr.Flags |= SMB2_FLAGS_SIGNED;
2488
2489         memset(&rqst, 0, sizeof(struct smb_rqst));
2490         rqst.rq_iov = iov;
2491         rqst.rq_nvec = n_iov;
2492
2493         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
2494                             &rsp_iov);
2495         cifs_small_buf_release(req);
2496         rsp = (struct smb2_ioctl_rsp *)rsp_iov.iov_base;
2497
2498         if (rc != 0)
2499                 trace_smb3_fsctl_err(xid, persistent_fid, tcon->tid,
2500                                 ses->Suid, 0, opcode, rc);
2501
2502         if ((rc != 0) && (rc != -EINVAL)) {
2503                 cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2504                 goto ioctl_exit;
2505         } else if (rc == -EINVAL) {
2506                 if ((opcode != FSCTL_SRV_COPYCHUNK_WRITE) &&
2507                     (opcode != FSCTL_SRV_COPYCHUNK)) {
2508                         cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
2509                         goto ioctl_exit;
2510                 }
2511         }
2512
2513         /* check if caller wants to look at return data or just return rc */
2514         if ((plen == NULL) || (out_data == NULL))
2515                 goto ioctl_exit;
2516
2517         *plen = le32_to_cpu(rsp->OutputCount);
2518
2519         /* We check for obvious errors in the output buffer length and offset */
2520         if (*plen == 0)
2521                 goto ioctl_exit; /* server returned no data */
2522         else if (*plen > rsp_iov.iov_len || *plen > 0xFF00) {
2523                 cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
2524                 *plen = 0;
2525                 rc = -EIO;
2526                 goto ioctl_exit;
2527         }
2528
2529         if (rsp_iov.iov_len - *plen < le32_to_cpu(rsp->OutputOffset)) {
2530                 cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
2531                         le32_to_cpu(rsp->OutputOffset));
2532                 *plen = 0;
2533                 rc = -EIO;
2534                 goto ioctl_exit;
2535         }
2536
2537         *out_data = kmalloc(*plen, GFP_KERNEL);
2538         if (*out_data == NULL) {
2539                 rc = -ENOMEM;
2540                 goto ioctl_exit;
2541         }
2542
2543         memcpy(*out_data, (char *)rsp + le32_to_cpu(rsp->OutputOffset), *plen);
2544 ioctl_exit:
2545         free_rsp_buf(resp_buftype, rsp);
2546         return rc;
2547 }
2548
2549 /*
2550  *   Individual callers to ioctl worker function follow
2551  */
2552
2553 int
2554 SMB2_set_compression(const unsigned int xid, struct cifs_tcon *tcon,
2555                      u64 persistent_fid, u64 volatile_fid)
2556 {
2557         int rc;
2558         struct  compress_ioctl fsctl_input;
2559         char *ret_data = NULL;
2560
2561         fsctl_input.CompressionState =
2562                         cpu_to_le16(COMPRESSION_FORMAT_DEFAULT);
2563
2564         rc = SMB2_ioctl(xid, tcon, persistent_fid, volatile_fid,
2565                         FSCTL_SET_COMPRESSION, true /* is_fsctl */,
2566                         (char *)&fsctl_input /* data input */,
2567                         2 /* in data len */, &ret_data /* out data */, NULL);
2568
2569         cifs_dbg(FYI, "set compression rc %d\n", rc);
2570
2571         return rc;
2572 }
2573
2574 int
2575 SMB2_close_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2576                 u64 persistent_fid, u64 volatile_fid)
2577 {
2578         struct smb2_close_req *req;
2579         struct kvec *iov = rqst->rq_iov;
2580         unsigned int total_len;
2581         int rc;
2582
2583         rc = smb2_plain_req_init(SMB2_CLOSE, tcon, (void **) &req, &total_len);
2584         if (rc)
2585                 return rc;
2586
2587         req->PersistentFileId = persistent_fid;
2588         req->VolatileFileId = volatile_fid;
2589         iov[0].iov_base = (char *)req;
2590         iov[0].iov_len = total_len;
2591
2592         return 0;
2593 }
2594
2595 void
2596 SMB2_close_free(struct smb_rqst *rqst)
2597 {
2598         if (rqst && rqst->rq_iov)
2599                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2600 }
2601
2602 int
2603 SMB2_close_flags(const unsigned int xid, struct cifs_tcon *tcon,
2604                  u64 persistent_fid, u64 volatile_fid, int flags)
2605 {
2606         struct smb_rqst rqst;
2607         struct smb2_close_rsp *rsp = NULL;
2608         struct cifs_ses *ses = tcon->ses;
2609         struct kvec iov[1];
2610         struct kvec rsp_iov;
2611         int resp_buftype = CIFS_NO_BUFFER;
2612         int rc = 0;
2613
2614         cifs_dbg(FYI, "Close\n");
2615
2616         if (!ses || !(ses->server))
2617                 return -EIO;
2618
2619         if (smb3_encryption_required(tcon))
2620                 flags |= CIFS_TRANSFORM_REQ;
2621
2622         memset(&rqst, 0, sizeof(struct smb_rqst));
2623         memset(&iov, 0, sizeof(iov));
2624         rqst.rq_iov = iov;
2625         rqst.rq_nvec = 1;
2626
2627         rc = SMB2_close_init(tcon, &rqst, persistent_fid, volatile_fid);
2628         if (rc)
2629                 goto close_exit;
2630
2631         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2632         rsp = (struct smb2_close_rsp *)rsp_iov.iov_base;
2633
2634         if (rc != 0) {
2635                 cifs_stats_fail_inc(tcon, SMB2_CLOSE_HE);
2636                 trace_smb3_close_err(xid, persistent_fid, tcon->tid, ses->Suid,
2637                                      rc);
2638                 goto close_exit;
2639         }
2640
2641         /* BB FIXME - decode close response, update inode for caching */
2642
2643 close_exit:
2644         SMB2_close_free(&rqst);
2645         free_rsp_buf(resp_buftype, rsp);
2646         return rc;
2647 }
2648
2649 int
2650 SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
2651            u64 persistent_fid, u64 volatile_fid)
2652 {
2653         int rc;
2654         int tmp_rc;
2655
2656         rc = SMB2_close_flags(xid, tcon, persistent_fid, volatile_fid, 0);
2657
2658         /* retry close in a worker thread if this one is interrupted */
2659         if (rc == -EINTR) {
2660                 tmp_rc = smb2_handle_cancelled_close(tcon, persistent_fid,
2661                                                      volatile_fid);
2662                 if (tmp_rc)
2663                         cifs_dbg(VFS, "handle cancelled close fid 0x%llx returned error %d\n",
2664                                  persistent_fid, tmp_rc);
2665         }
2666
2667         return rc;
2668 }
2669
2670 int
2671 smb2_validate_iov(unsigned int offset, unsigned int buffer_length,
2672                   struct kvec *iov, unsigned int min_buf_size)
2673 {
2674         unsigned int smb_len = iov->iov_len;
2675         char *end_of_smb = smb_len + (char *)iov->iov_base;
2676         char *begin_of_buf = offset + (char *)iov->iov_base;
2677         char *end_of_buf = begin_of_buf + buffer_length;
2678
2679
2680         if (buffer_length < min_buf_size) {
2681                 cifs_dbg(VFS, "buffer length %d smaller than minimum size %d\n",
2682                          buffer_length, min_buf_size);
2683                 return -EINVAL;
2684         }
2685
2686         /* check if beyond RFC1001 maximum length */
2687         if ((smb_len > 0x7FFFFF) || (buffer_length > 0x7FFFFF)) {
2688                 cifs_dbg(VFS, "buffer length %d or smb length %d too large\n",
2689                          buffer_length, smb_len);
2690                 return -EINVAL;
2691         }
2692
2693         if ((begin_of_buf > end_of_smb) || (end_of_buf > end_of_smb)) {
2694                 cifs_dbg(VFS, "illegal server response, bad offset to data\n");
2695                 return -EINVAL;
2696         }
2697
2698         return 0;
2699 }
2700
2701 /*
2702  * If SMB buffer fields are valid, copy into temporary buffer to hold result.
2703  * Caller must free buffer.
2704  */
2705 static int
2706 validate_and_copy_iov(unsigned int offset, unsigned int buffer_length,
2707                       struct kvec *iov, unsigned int minbufsize,
2708                       char *data)
2709 {
2710         char *begin_of_buf = offset + (char *)iov->iov_base;
2711         int rc;
2712
2713         if (!data)
2714                 return -EINVAL;
2715
2716         rc = smb2_validate_iov(offset, buffer_length, iov, minbufsize);
2717         if (rc)
2718                 return rc;
2719
2720         memcpy(data, begin_of_buf, buffer_length);
2721
2722         return 0;
2723 }
2724
2725 int
2726 SMB2_query_info_init(struct cifs_tcon *tcon, struct smb_rqst *rqst,
2727                      u64 persistent_fid, u64 volatile_fid,
2728                      u8 info_class, u8 info_type, u32 additional_info,
2729                      size_t output_len)
2730 {
2731         struct smb2_query_info_req *req;
2732         struct kvec *iov = rqst->rq_iov;
2733         unsigned int total_len;
2734         int rc;
2735
2736         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
2737                              &total_len);
2738         if (rc)
2739                 return rc;
2740
2741         req->InfoType = info_type;
2742         req->FileInfoClass = info_class;
2743         req->PersistentFileId = persistent_fid;
2744         req->VolatileFileId = volatile_fid;
2745         req->AdditionalInformation = cpu_to_le32(additional_info);
2746
2747         /*
2748          * We do not use the input buffer (do not send extra byte)
2749          */
2750         req->InputBufferOffset = 0;
2751
2752         req->OutputBufferLength = cpu_to_le32(output_len);
2753
2754         iov[0].iov_base = (char *)req;
2755         /* 1 for Buffer */
2756         iov[0].iov_len = total_len - 1;
2757         return 0;
2758 }
2759
2760 void
2761 SMB2_query_info_free(struct smb_rqst *rqst)
2762 {
2763         if (rqst && rqst->rq_iov)
2764                 cifs_small_buf_release(rqst->rq_iov[0].iov_base); /* request */
2765 }
2766
2767 static int
2768 query_info(const unsigned int xid, struct cifs_tcon *tcon,
2769            u64 persistent_fid, u64 volatile_fid, u8 info_class, u8 info_type,
2770            u32 additional_info, size_t output_len, size_t min_len, void **data,
2771                 u32 *dlen)
2772 {
2773         struct smb_rqst rqst;
2774         struct smb2_query_info_rsp *rsp = NULL;
2775         struct kvec iov[1];
2776         struct kvec rsp_iov;
2777         int rc = 0;
2778         int resp_buftype = CIFS_NO_BUFFER;
2779         struct cifs_ses *ses = tcon->ses;
2780         int flags = 0;
2781
2782         cifs_dbg(FYI, "Query Info\n");
2783
2784         if (!ses || !(ses->server))
2785                 return -EIO;
2786
2787         if (smb3_encryption_required(tcon))
2788                 flags |= CIFS_TRANSFORM_REQ;
2789
2790         memset(&rqst, 0, sizeof(struct smb_rqst));
2791         memset(&iov, 0, sizeof(iov));
2792         rqst.rq_iov = iov;
2793         rqst.rq_nvec = 1;
2794
2795         rc = SMB2_query_info_init(tcon, &rqst, persistent_fid, volatile_fid,
2796                                   info_class, info_type, additional_info,
2797                                   output_len);
2798         if (rc)
2799                 goto qinf_exit;
2800
2801         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
2802         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
2803
2804         if (rc) {
2805                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
2806                 trace_smb3_query_info_err(xid, persistent_fid, tcon->tid,
2807                                 ses->Suid, info_class, (__u32)info_type, rc);
2808                 goto qinf_exit;
2809         }
2810
2811         if (dlen) {
2812                 *dlen = le32_to_cpu(rsp->OutputBufferLength);
2813                 if (!*data) {
2814                         *data = kmalloc(*dlen, GFP_KERNEL);
2815                         if (!*data) {
2816                                 cifs_dbg(VFS,
2817                                         "Error %d allocating memory for acl\n",
2818                                         rc);
2819                                 *dlen = 0;
2820                                 goto qinf_exit;
2821                         }
2822                 }
2823         }
2824
2825         rc = validate_and_copy_iov(le16_to_cpu(rsp->OutputBufferOffset),
2826                                    le32_to_cpu(rsp->OutputBufferLength),
2827                                    &rsp_iov, min_len, *data);
2828
2829 qinf_exit:
2830         SMB2_query_info_free(&rqst);
2831         free_rsp_buf(resp_buftype, rsp);
2832         return rc;
2833 }
2834
2835 int SMB2_query_eas(const unsigned int xid, struct cifs_tcon *tcon,
2836                    u64 persistent_fid, u64 volatile_fid,
2837                    int ea_buf_size, struct smb2_file_full_ea_info *data)
2838 {
2839         return query_info(xid, tcon, persistent_fid, volatile_fid,
2840                           FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE, 0,
2841                           ea_buf_size,
2842                           sizeof(struct smb2_file_full_ea_info),
2843                           (void **)&data,
2844                           NULL);
2845 }
2846
2847 int SMB2_query_info(const unsigned int xid, struct cifs_tcon *tcon,
2848         u64 persistent_fid, u64 volatile_fid, struct smb2_file_all_info *data)
2849 {
2850         return query_info(xid, tcon, persistent_fid, volatile_fid,
2851                           FILE_ALL_INFORMATION, SMB2_O_INFO_FILE, 0,
2852                           sizeof(struct smb2_file_all_info) + PATH_MAX * 2,
2853                           sizeof(struct smb2_file_all_info), (void **)&data,
2854                           NULL);
2855 }
2856
2857 int
2858 SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon,
2859                 u64 persistent_fid, u64 volatile_fid,
2860                 void **data, u32 *plen)
2861 {
2862         __u32 additional_info = OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO;
2863         *plen = 0;
2864
2865         return query_info(xid, tcon, persistent_fid, volatile_fid,
2866                           0, SMB2_O_INFO_SECURITY, additional_info,
2867                           SMB2_MAX_BUFFER_SIZE, MIN_SEC_DESC_LEN, data, plen);
2868 }
2869
2870 int
2871 SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon,
2872                  u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid)
2873 {
2874         return query_info(xid, tcon, persistent_fid, volatile_fid,
2875                           FILE_INTERNAL_INFORMATION, SMB2_O_INFO_FILE, 0,
2876                           sizeof(struct smb2_file_internal_info),
2877                           sizeof(struct smb2_file_internal_info),
2878                           (void **)&uniqueid, NULL);
2879 }
2880
2881 /*
2882  * This is a no-op for now. We're not really interested in the reply, but
2883  * rather in the fact that the server sent one and that server->lstrp
2884  * gets updated.
2885  *
2886  * FIXME: maybe we should consider checking that the reply matches request?
2887  */
2888 static void
2889 smb2_echo_callback(struct mid_q_entry *mid)
2890 {
2891         struct TCP_Server_Info *server = mid->callback_data;
2892         struct smb2_echo_rsp *rsp = (struct smb2_echo_rsp *)mid->resp_buf;
2893         unsigned int credits_received = 0;
2894
2895         if (mid->mid_state == MID_RESPONSE_RECEIVED
2896             || mid->mid_state == MID_RESPONSE_MALFORMED)
2897                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
2898
2899         DeleteMidQEntry(mid);
2900         add_credits(server, credits_received, CIFS_ECHO_OP);
2901 }
2902
2903 void smb2_reconnect_server(struct work_struct *work)
2904 {
2905         struct TCP_Server_Info *server = container_of(work,
2906                                         struct TCP_Server_Info, reconnect.work);
2907         struct cifs_ses *ses;
2908         struct cifs_tcon *tcon, *tcon2;
2909         struct list_head tmp_list;
2910         int tcon_exist = false;
2911         int rc;
2912         int resched = false;
2913
2914
2915         /* Prevent simultaneous reconnects that can corrupt tcon->rlist list */
2916         mutex_lock(&server->reconnect_mutex);
2917
2918         INIT_LIST_HEAD(&tmp_list);
2919         cifs_dbg(FYI, "Need negotiate, reconnecting tcons\n");
2920
2921         spin_lock(&cifs_tcp_ses_lock);
2922         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
2923                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
2924                         if (tcon->need_reconnect || tcon->need_reopen_files) {
2925                                 tcon->tc_count++;
2926                                 list_add_tail(&tcon->rlist, &tmp_list);
2927                                 tcon_exist = true;
2928                         }
2929                 }
2930                 if (ses->tcon_ipc && ses->tcon_ipc->need_reconnect) {
2931                         list_add_tail(&ses->tcon_ipc->rlist, &tmp_list);
2932                         tcon_exist = true;
2933                 }
2934         }
2935         /*
2936          * Get the reference to server struct to be sure that the last call of
2937          * cifs_put_tcon() in the loop below won't release the server pointer.
2938          */
2939         if (tcon_exist)
2940                 server->srv_count++;
2941
2942         spin_unlock(&cifs_tcp_ses_lock);
2943
2944         list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) {
2945                 rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon);
2946                 if (!rc)
2947                         cifs_reopen_persistent_handles(tcon);
2948                 else
2949                         resched = true;
2950                 list_del_init(&tcon->rlist);
2951                 cifs_put_tcon(tcon);
2952         }
2953
2954         cifs_dbg(FYI, "Reconnecting tcons finished\n");
2955         if (resched)
2956                 queue_delayed_work(cifsiod_wq, &server->reconnect, 2 * HZ);
2957         mutex_unlock(&server->reconnect_mutex);
2958
2959         /* now we can safely release srv struct */
2960         if (tcon_exist)
2961                 cifs_put_tcp_session(server, 1);
2962 }
2963
2964 int
2965 SMB2_echo(struct TCP_Server_Info *server)
2966 {
2967         struct smb2_echo_req *req;
2968         int rc = 0;
2969         struct kvec iov[1];
2970         struct smb_rqst rqst = { .rq_iov = iov,
2971                                  .rq_nvec = 1 };
2972         unsigned int total_len;
2973
2974         cifs_dbg(FYI, "In echo request\n");
2975
2976         if (server->tcpStatus == CifsNeedNegotiate) {
2977                 /* No need to send echo on newly established connections */
2978                 queue_delayed_work(cifsiod_wq, &server->reconnect, 0);
2979                 return rc;
2980         }
2981
2982         rc = smb2_plain_req_init(SMB2_ECHO, NULL, (void **)&req, &total_len);
2983         if (rc)
2984                 return rc;
2985
2986         req->sync_hdr.CreditRequest = cpu_to_le16(1);
2987
2988         iov[0].iov_len = total_len;
2989         iov[0].iov_base = (char *)req;
2990
2991         rc = cifs_call_async(server, &rqst, NULL, smb2_echo_callback, NULL,
2992                              server, CIFS_ECHO_OP);
2993         if (rc)
2994                 cifs_dbg(FYI, "Echo request failed: %d\n", rc);
2995
2996         cifs_small_buf_release(req);
2997         return rc;
2998 }
2999
3000 int
3001 SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
3002            u64 volatile_fid)
3003 {
3004         struct smb_rqst rqst;
3005         struct smb2_flush_req *req;
3006         struct cifs_ses *ses = tcon->ses;
3007         struct kvec iov[1];
3008         struct kvec rsp_iov;
3009         int resp_buftype;
3010         int rc = 0;
3011         int flags = 0;
3012         unsigned int total_len;
3013
3014         cifs_dbg(FYI, "Flush\n");
3015
3016         if (!ses || !(ses->server))
3017                 return -EIO;
3018
3019         rc = smb2_plain_req_init(SMB2_FLUSH, tcon, (void **) &req, &total_len);
3020         if (rc)
3021                 return rc;
3022
3023         if (smb3_encryption_required(tcon))
3024                 flags |= CIFS_TRANSFORM_REQ;
3025
3026         req->PersistentFileId = persistent_fid;
3027         req->VolatileFileId = volatile_fid;
3028
3029         iov[0].iov_base = (char *)req;
3030         iov[0].iov_len = total_len;
3031
3032         memset(&rqst, 0, sizeof(struct smb_rqst));
3033         rqst.rq_iov = iov;
3034         rqst.rq_nvec = 1;
3035
3036         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3037         cifs_small_buf_release(req);
3038
3039         if (rc != 0) {
3040                 cifs_stats_fail_inc(tcon, SMB2_FLUSH_HE);
3041                 trace_smb3_flush_err(xid, persistent_fid, tcon->tid, ses->Suid,
3042                                      rc);
3043         }
3044
3045         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3046         return rc;
3047 }
3048
3049 /*
3050  * To form a chain of read requests, any read requests after the first should
3051  * have the end_of_chain boolean set to true.
3052  */
3053 static int
3054 smb2_new_read_req(void **buf, unsigned int *total_len,
3055         struct cifs_io_parms *io_parms, struct cifs_readdata *rdata,
3056         unsigned int remaining_bytes, int request_type)
3057 {
3058         int rc = -EACCES;
3059         struct smb2_read_plain_req *req = NULL;
3060         struct smb2_sync_hdr *shdr;
3061         struct TCP_Server_Info *server;
3062
3063         rc = smb2_plain_req_init(SMB2_READ, io_parms->tcon, (void **) &req,
3064                                  total_len);
3065         if (rc)
3066                 return rc;
3067
3068         server = io_parms->tcon->ses->server;
3069         if (server == NULL)
3070                 return -ECONNABORTED;
3071
3072         shdr = &req->sync_hdr;
3073         shdr->ProcessId = cpu_to_le32(io_parms->pid);
3074
3075         req->PersistentFileId = io_parms->persistent_fid;
3076         req->VolatileFileId = io_parms->volatile_fid;
3077         req->ReadChannelInfoOffset = 0; /* reserved */
3078         req->ReadChannelInfoLength = 0; /* reserved */
3079         req->Channel = 0; /* reserved */
3080         req->MinimumCount = 0;
3081         req->Length = cpu_to_le32(io_parms->length);
3082         req->Offset = cpu_to_le64(io_parms->offset);
3083 #ifdef CONFIG_CIFS_SMB_DIRECT
3084         /*
3085          * If we want to do a RDMA write, fill in and append
3086          * smbd_buffer_descriptor_v1 to the end of read request
3087          */
3088         if (server->rdma && rdata && !server->sign &&
3089                 rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
3090
3091                 struct smbd_buffer_descriptor_v1 *v1;
3092                 bool need_invalidate =
3093                         io_parms->tcon->ses->server->dialect == SMB30_PROT_ID;
3094
3095                 rdata->mr = smbd_register_mr(
3096                                 server->smbd_conn, rdata->pages,
3097                                 rdata->nr_pages, rdata->page_offset,
3098                                 rdata->tailsz, true, need_invalidate);
3099                 if (!rdata->mr)
3100                         return -ENOBUFS;
3101
3102                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3103                 if (need_invalidate)
3104                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3105                 req->ReadChannelInfoOffset =
3106                         cpu_to_le16(offsetof(struct smb2_read_plain_req, Buffer));
3107                 req->ReadChannelInfoLength =
3108                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3109                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3110                 v1->offset = cpu_to_le64(rdata->mr->mr->iova);
3111                 v1->token = cpu_to_le32(rdata->mr->mr->rkey);
3112                 v1->length = cpu_to_le32(rdata->mr->mr->length);
3113
3114                 *total_len += sizeof(*v1) - 1;
3115         }
3116 #endif
3117         if (request_type & CHAINED_REQUEST) {
3118                 if (!(request_type & END_OF_CHAIN)) {
3119                         /* next 8-byte aligned request */
3120                         *total_len = DIV_ROUND_UP(*total_len, 8) * 8;
3121                         shdr->NextCommand = cpu_to_le32(*total_len);
3122                 } else /* END_OF_CHAIN */
3123                         shdr->NextCommand = 0;
3124                 if (request_type & RELATED_REQUEST) {
3125                         shdr->Flags |= SMB2_FLAGS_RELATED_OPERATIONS;
3126                         /*
3127                          * Related requests use info from previous read request
3128                          * in chain.
3129                          */
3130                         shdr->SessionId = 0xFFFFFFFFFFFFFFFF;
3131                         shdr->TreeId = 0xFFFFFFFF;
3132                         req->PersistentFileId = 0xFFFFFFFFFFFFFFFF;
3133                         req->VolatileFileId = 0xFFFFFFFFFFFFFFFF;
3134                 }
3135         }
3136         if (remaining_bytes > io_parms->length)
3137                 req->RemainingBytes = cpu_to_le32(remaining_bytes);
3138         else
3139                 req->RemainingBytes = 0;
3140
3141         *buf = req;
3142         return rc;
3143 }
3144
3145 static void
3146 smb2_readv_callback(struct mid_q_entry *mid)
3147 {
3148         struct cifs_readdata *rdata = mid->callback_data;
3149         struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink);
3150         struct TCP_Server_Info *server = tcon->ses->server;
3151         struct smb2_sync_hdr *shdr =
3152                                 (struct smb2_sync_hdr *)rdata->iov[0].iov_base;
3153         unsigned int credits_received = 0;
3154         struct smb_rqst rqst = { .rq_iov = &rdata->iov[1],
3155                                  .rq_nvec = 1, };
3156
3157         if (rdata->got_bytes) {
3158                 rqst.rq_pages = rdata->pages;
3159                 rqst.rq_offset = rdata->page_offset;
3160                 rqst.rq_npages = rdata->nr_pages;
3161                 rqst.rq_pagesz = rdata->pagesz;
3162                 rqst.rq_tailsz = rdata->tailsz;
3163         }
3164
3165         cifs_dbg(FYI, "%s: mid=%llu state=%d result=%d bytes=%u\n",
3166                  __func__, mid->mid, mid->mid_state, rdata->result,
3167                  rdata->bytes);
3168
3169         switch (mid->mid_state) {
3170         case MID_RESPONSE_RECEIVED:
3171                 credits_received = le16_to_cpu(shdr->CreditRequest);
3172                 /* result already set, check signature */
3173                 if (server->sign && !mid->decrypted) {
3174                         int rc;
3175
3176                         rc = smb2_verify_signature(&rqst, server);
3177                         if (rc)
3178                                 cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
3179                                          rc);
3180                 }
3181                 /* FIXME: should this be counted toward the initiating task? */
3182                 task_io_account_read(rdata->got_bytes);
3183                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3184                 break;
3185         case MID_REQUEST_SUBMITTED:
3186         case MID_RETRY_NEEDED:
3187                 rdata->result = -EAGAIN;
3188                 if (server->sign && rdata->got_bytes)
3189                         /* reset bytes number since we can not check a sign */
3190                         rdata->got_bytes = 0;
3191                 /* FIXME: should this be counted toward the initiating task? */
3192                 task_io_account_read(rdata->got_bytes);
3193                 cifs_stats_bytes_read(tcon, rdata->got_bytes);
3194                 break;
3195         case MID_RESPONSE_MALFORMED:
3196                 credits_received = le16_to_cpu(shdr->CreditRequest);
3197                 /* fall through */
3198         default:
3199                 if (rdata->result != -ENODATA)
3200                         rdata->result = -EIO;
3201         }
3202 #ifdef CONFIG_CIFS_SMB_DIRECT
3203         /*
3204          * If this rdata has a memmory registered, the MR can be freed
3205          * MR needs to be freed as soon as I/O finishes to prevent deadlock
3206          * because they have limited number and are used for future I/Os
3207          */
3208         if (rdata->mr) {
3209                 smbd_deregister_mr(rdata->mr);
3210                 rdata->mr = NULL;
3211         }
3212 #endif
3213         if (rdata->result && rdata->result != -ENODATA) {
3214                 cifs_stats_fail_inc(tcon, SMB2_READ_HE);
3215                 trace_smb3_read_err(0 /* xid */,
3216                                     rdata->cfile->fid.persistent_fid,
3217                                     tcon->tid, tcon->ses->Suid, rdata->offset,
3218                                     rdata->bytes, rdata->result);
3219         } else
3220                 trace_smb3_read_done(0 /* xid */,
3221                                      rdata->cfile->fid.persistent_fid,
3222                                      tcon->tid, tcon->ses->Suid,
3223                                      rdata->offset, rdata->got_bytes);
3224
3225         queue_work(cifsiod_wq, &rdata->work);
3226         DeleteMidQEntry(mid);
3227         add_credits(server, credits_received, 0);
3228 }
3229
3230 /* smb2_async_readv - send an async read, and set up mid to handle result */
3231 int
3232 smb2_async_readv(struct cifs_readdata *rdata)
3233 {
3234         int rc, flags = 0;
3235         char *buf;
3236         struct smb2_sync_hdr *shdr;
3237         struct cifs_io_parms io_parms;
3238         struct smb_rqst rqst = { .rq_iov = rdata->iov,
3239                                  .rq_nvec = 1 };
3240         struct TCP_Server_Info *server;
3241         unsigned int total_len;
3242
3243         cifs_dbg(FYI, "%s: offset=%llu bytes=%u\n",
3244                  __func__, rdata->offset, rdata->bytes);
3245
3246         io_parms.tcon = tlink_tcon(rdata->cfile->tlink);
3247         io_parms.offset = rdata->offset;
3248         io_parms.length = rdata->bytes;
3249         io_parms.persistent_fid = rdata->cfile->fid.persistent_fid;
3250         io_parms.volatile_fid = rdata->cfile->fid.volatile_fid;
3251         io_parms.pid = rdata->pid;
3252
3253         server = io_parms.tcon->ses->server;
3254
3255         rc = smb2_new_read_req(
3256                 (void **) &buf, &total_len, &io_parms, rdata, 0, 0);
3257         if (rc) {
3258                 if (rc == -EAGAIN && rdata->credits) {
3259                         /* credits was reset by reconnect */
3260                         rdata->credits = 0;
3261                         /* reduce in_flight value since we won't send the req */
3262                         spin_lock(&server->req_lock);
3263                         server->in_flight--;
3264                         spin_unlock(&server->req_lock);
3265                 }
3266                 return rc;
3267         }
3268
3269         if (smb3_encryption_required(io_parms.tcon))
3270                 flags |= CIFS_TRANSFORM_REQ;
3271
3272         rdata->iov[0].iov_base = buf;
3273         rdata->iov[0].iov_len = total_len;
3274
3275         shdr = (struct smb2_sync_hdr *)buf;
3276
3277         if (rdata->credits) {
3278                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(rdata->bytes,
3279                                                 SMB2_MAX_BUFFER_SIZE));
3280                 shdr->CreditRequest =
3281                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3282                 spin_lock(&server->req_lock);
3283                 server->credits += rdata->credits -
3284                                                 le16_to_cpu(shdr->CreditCharge);
3285                 spin_unlock(&server->req_lock);
3286                 wake_up(&server->request_q);
3287                 rdata->credits = le16_to_cpu(shdr->CreditCharge);
3288                 flags |= CIFS_HAS_CREDITS;
3289         }
3290
3291         kref_get(&rdata->refcount);
3292         rc = cifs_call_async(io_parms.tcon->ses->server, &rqst,
3293                              cifs_readv_receive, smb2_readv_callback,
3294                              smb3_handle_read_data, rdata, flags);
3295         if (rc) {
3296                 kref_put(&rdata->refcount, cifs_readdata_release);
3297                 cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE);
3298                 trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid,
3299                                     io_parms.tcon->tid,
3300                                     io_parms.tcon->ses->Suid,
3301                                     io_parms.offset, io_parms.length, rc);
3302         }
3303
3304         cifs_small_buf_release(buf);
3305         return rc;
3306 }
3307
3308 int
3309 SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms,
3310           unsigned int *nbytes, char **buf, int *buf_type)
3311 {
3312         struct smb_rqst rqst;
3313         int resp_buftype, rc = -EACCES;
3314         struct smb2_read_plain_req *req = NULL;
3315         struct smb2_read_rsp *rsp = NULL;
3316         struct kvec iov[1];
3317         struct kvec rsp_iov;
3318         unsigned int total_len;
3319         int flags = CIFS_LOG_ERROR;
3320         struct cifs_ses *ses = io_parms->tcon->ses;
3321
3322         *nbytes = 0;
3323         rc = smb2_new_read_req((void **)&req, &total_len, io_parms, NULL, 0, 0);
3324         if (rc)
3325                 return rc;
3326
3327         if (smb3_encryption_required(io_parms->tcon))
3328                 flags |= CIFS_TRANSFORM_REQ;
3329
3330         iov[0].iov_base = (char *)req;
3331         iov[0].iov_len = total_len;
3332
3333         memset(&rqst, 0, sizeof(struct smb_rqst));
3334         rqst.rq_iov = iov;
3335         rqst.rq_nvec = 1;
3336
3337         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3338         rsp = (struct smb2_read_rsp *)rsp_iov.iov_base;
3339
3340         if (rc) {
3341                 if (rc != -ENODATA) {
3342                         cifs_stats_fail_inc(io_parms->tcon, SMB2_READ_HE);
3343                         cifs_dbg(VFS, "Send error in read = %d\n", rc);
3344                         trace_smb3_read_err(xid, req->PersistentFileId,
3345                                             io_parms->tcon->tid, ses->Suid,
3346                                             io_parms->offset, io_parms->length,
3347                                             rc);
3348                 }
3349                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3350                 cifs_small_buf_release(req);
3351                 return rc == -ENODATA ? 0 : rc;
3352         } else
3353                 trace_smb3_read_done(xid, req->PersistentFileId,
3354                                     io_parms->tcon->tid, ses->Suid,
3355                                     io_parms->offset, io_parms->length);
3356
3357         cifs_small_buf_release(req);
3358
3359         *nbytes = le32_to_cpu(rsp->DataLength);
3360         if ((*nbytes > CIFS_MAX_MSGSIZE) ||
3361             (*nbytes > io_parms->length)) {
3362                 cifs_dbg(FYI, "bad length %d for count %d\n",
3363                          *nbytes, io_parms->length);
3364                 rc = -EIO;
3365                 *nbytes = 0;
3366         }
3367
3368         if (*buf) {
3369                 memcpy(*buf, (char *)rsp + rsp->DataOffset, *nbytes);
3370                 free_rsp_buf(resp_buftype, rsp_iov.iov_base);
3371         } else if (resp_buftype != CIFS_NO_BUFFER) {
3372                 *buf = rsp_iov.iov_base;
3373                 if (resp_buftype == CIFS_SMALL_BUFFER)
3374                         *buf_type = CIFS_SMALL_BUFFER;
3375                 else if (resp_buftype == CIFS_LARGE_BUFFER)
3376                         *buf_type = CIFS_LARGE_BUFFER;
3377         }
3378         return rc;
3379 }
3380
3381 /*
3382  * Check the mid_state and signature on received buffer (if any), and queue the
3383  * workqueue completion task.
3384  */
3385 static void
3386 smb2_writev_callback(struct mid_q_entry *mid)
3387 {
3388         struct cifs_writedata *wdata = mid->callback_data;
3389         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3390         unsigned int written;
3391         struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
3392         unsigned int credits_received = 0;
3393
3394         switch (mid->mid_state) {
3395         case MID_RESPONSE_RECEIVED:
3396                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3397                 wdata->result = smb2_check_receive(mid, tcon->ses->server, 0);
3398                 if (wdata->result != 0)
3399                         break;
3400
3401                 written = le32_to_cpu(rsp->DataLength);
3402                 /*
3403                  * Mask off high 16 bits when bytes written as returned
3404                  * by the server is greater than bytes requested by the
3405                  * client. OS/2 servers are known to set incorrect
3406                  * CountHigh values.
3407                  */
3408                 if (written > wdata->bytes)
3409                         written &= 0xFFFF;
3410
3411                 if (written < wdata->bytes)
3412                         wdata->result = -ENOSPC;
3413                 else
3414                         wdata->bytes = written;
3415                 break;
3416         case MID_REQUEST_SUBMITTED:
3417         case MID_RETRY_NEEDED:
3418                 wdata->result = -EAGAIN;
3419                 break;
3420         case MID_RESPONSE_MALFORMED:
3421                 credits_received = le16_to_cpu(rsp->sync_hdr.CreditRequest);
3422                 /* fall through */
3423         default:
3424                 wdata->result = -EIO;
3425                 break;
3426         }
3427 #ifdef CONFIG_CIFS_SMB_DIRECT
3428         /*
3429          * If this wdata has a memory registered, the MR can be freed
3430          * The number of MRs available is limited, it's important to recover
3431          * used MR as soon as I/O is finished. Hold MR longer in the later
3432          * I/O process can possibly result in I/O deadlock due to lack of MR
3433          * to send request on I/O retry
3434          */
3435         if (wdata->mr) {
3436                 smbd_deregister_mr(wdata->mr);
3437                 wdata->mr = NULL;
3438         }
3439 #endif
3440         if (wdata->result) {
3441                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3442                 trace_smb3_write_err(0 /* no xid */,
3443                                      wdata->cfile->fid.persistent_fid,
3444                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3445                                      wdata->bytes, wdata->result);
3446                 if (wdata->result == -ENOSPC)
3447                         printk_once(KERN_WARNING "Out of space writing to %s\n",
3448                                     tcon->treeName);
3449         } else
3450                 trace_smb3_write_done(0 /* no xid */,
3451                                       wdata->cfile->fid.persistent_fid,
3452                                       tcon->tid, tcon->ses->Suid,
3453                                       wdata->offset, wdata->bytes);
3454
3455         queue_work(cifsiod_wq, &wdata->work);
3456         DeleteMidQEntry(mid);
3457         add_credits(tcon->ses->server, credits_received, 0);
3458 }
3459
3460 /* smb2_async_writev - send an async write, and set up mid to handle result */
3461 int
3462 smb2_async_writev(struct cifs_writedata *wdata,
3463                   void (*release)(struct kref *kref))
3464 {
3465         int rc = -EACCES, flags = 0;
3466         struct smb2_write_req *req = NULL;
3467         struct smb2_sync_hdr *shdr;
3468         struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
3469         struct TCP_Server_Info *server = tcon->ses->server;
3470         struct kvec iov[1];
3471         struct smb_rqst rqst = { };
3472         unsigned int total_len;
3473
3474         rc = smb2_plain_req_init(SMB2_WRITE, tcon, (void **) &req, &total_len);
3475         if (rc) {
3476                 if (rc == -EAGAIN && wdata->credits) {
3477                         /* credits was reset by reconnect */
3478                         wdata->credits = 0;
3479                         /* reduce in_flight value since we won't send the req */
3480                         spin_lock(&server->req_lock);
3481                         server->in_flight--;
3482                         spin_unlock(&server->req_lock);
3483                 }
3484                 goto async_writev_out;
3485         }
3486
3487         if (smb3_encryption_required(tcon))
3488                 flags |= CIFS_TRANSFORM_REQ;
3489
3490         shdr = (struct smb2_sync_hdr *)req;
3491         shdr->ProcessId = cpu_to_le32(wdata->cfile->pid);
3492
3493         req->PersistentFileId = wdata->cfile->fid.persistent_fid;
3494         req->VolatileFileId = wdata->cfile->fid.volatile_fid;
3495         req->WriteChannelInfoOffset = 0;
3496         req->WriteChannelInfoLength = 0;
3497         req->Channel = 0;
3498         req->Offset = cpu_to_le64(wdata->offset);
3499         req->DataOffset = cpu_to_le16(
3500                                 offsetof(struct smb2_write_req, Buffer));
3501         req->RemainingBytes = 0;
3502 #ifdef CONFIG_CIFS_SMB_DIRECT
3503         /*
3504          * If we want to do a server RDMA read, fill in and append
3505          * smbd_buffer_descriptor_v1 to the end of write request
3506          */
3507         if (server->rdma && !server->sign && wdata->bytes >=
3508                 server->smbd_conn->rdma_readwrite_threshold) {
3509
3510                 struct smbd_buffer_descriptor_v1 *v1;
3511                 bool need_invalidate = server->dialect == SMB30_PROT_ID;
3512
3513                 wdata->mr = smbd_register_mr(
3514                                 server->smbd_conn, wdata->pages,
3515                                 wdata->nr_pages, wdata->page_offset,
3516                                 wdata->tailsz, false, need_invalidate);
3517                 if (!wdata->mr) {
3518                         rc = -ENOBUFS;
3519                         goto async_writev_out;
3520                 }
3521                 req->Length = 0;
3522                 req->DataOffset = 0;
3523                 if (wdata->nr_pages > 1)
3524                         req->RemainingBytes =
3525                                 cpu_to_le32(
3526                                         (wdata->nr_pages - 1) * wdata->pagesz -
3527                                         wdata->page_offset + wdata->tailsz
3528                                 );
3529                 else
3530                         req->RemainingBytes = cpu_to_le32(wdata->tailsz);
3531                 req->Channel = SMB2_CHANNEL_RDMA_V1_INVALIDATE;
3532                 if (need_invalidate)
3533                         req->Channel = SMB2_CHANNEL_RDMA_V1;
3534                 req->WriteChannelInfoOffset =
3535                         cpu_to_le16(offsetof(struct smb2_write_req, Buffer));
3536                 req->WriteChannelInfoLength =
3537                         cpu_to_le16(sizeof(struct smbd_buffer_descriptor_v1));
3538                 v1 = (struct smbd_buffer_descriptor_v1 *) &req->Buffer[0];
3539                 v1->offset = cpu_to_le64(wdata->mr->mr->iova);
3540                 v1->token = cpu_to_le32(wdata->mr->mr->rkey);
3541                 v1->length = cpu_to_le32(wdata->mr->mr->length);
3542         }
3543 #endif
3544         iov[0].iov_len = total_len - 1;
3545         iov[0].iov_base = (char *)req;
3546
3547         rqst.rq_iov = iov;
3548         rqst.rq_nvec = 1;
3549         rqst.rq_pages = wdata->pages;
3550         rqst.rq_offset = wdata->page_offset;
3551         rqst.rq_npages = wdata->nr_pages;
3552         rqst.rq_pagesz = wdata->pagesz;
3553         rqst.rq_tailsz = wdata->tailsz;
3554 #ifdef CONFIG_CIFS_SMB_DIRECT
3555         if (wdata->mr) {
3556                 iov[0].iov_len += sizeof(struct smbd_buffer_descriptor_v1);
3557                 rqst.rq_npages = 0;
3558         }
3559 #endif
3560         cifs_dbg(FYI, "async write at %llu %u bytes\n",
3561                  wdata->offset, wdata->bytes);
3562
3563 #ifdef CONFIG_CIFS_SMB_DIRECT
3564         /* For RDMA read, I/O size is in RemainingBytes not in Length */
3565         if (!wdata->mr)
3566                 req->Length = cpu_to_le32(wdata->bytes);
3567 #else
3568         req->Length = cpu_to_le32(wdata->bytes);
3569 #endif
3570
3571         if (wdata->credits) {
3572                 shdr->CreditCharge = cpu_to_le16(DIV_ROUND_UP(wdata->bytes,
3573                                                     SMB2_MAX_BUFFER_SIZE));
3574                 shdr->CreditRequest =
3575                         cpu_to_le16(le16_to_cpu(shdr->CreditCharge) + 1);
3576                 spin_lock(&server->req_lock);
3577                 server->credits += wdata->credits -
3578                                                 le16_to_cpu(shdr->CreditCharge);
3579                 spin_unlock(&server->req_lock);
3580                 wake_up(&server->request_q);
3581                 wdata->credits = le16_to_cpu(shdr->CreditCharge);
3582                 flags |= CIFS_HAS_CREDITS;
3583         }
3584
3585         kref_get(&wdata->refcount);
3586         rc = cifs_call_async(server, &rqst, NULL, smb2_writev_callback, NULL,
3587                              wdata, flags);
3588
3589         if (rc) {
3590                 trace_smb3_write_err(0 /* no xid */, req->PersistentFileId,
3591                                      tcon->tid, tcon->ses->Suid, wdata->offset,
3592                                      wdata->bytes, rc);
3593                 kref_put(&wdata->refcount, release);
3594                 cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
3595         }
3596
3597 async_writev_out:
3598         cifs_small_buf_release(req);
3599         return rc;
3600 }
3601
3602 /*
3603  * SMB2_write function gets iov pointer to kvec array with n_vec as a length.
3604  * The length field from io_parms must be at least 1 and indicates a number of
3605  * elements with data to write that begins with position 1 in iov array. All
3606  * data length is specified by count.
3607  */
3608 int
3609 SMB2_write(const unsigned int xid, struct cifs_io_parms *io_parms,
3610            unsigned int *nbytes, struct kvec *iov, int n_vec)
3611 {
3612         struct smb_rqst rqst;
3613         int rc = 0;
3614         struct smb2_write_req *req = NULL;
3615         struct smb2_write_rsp *rsp = NULL;
3616         int resp_buftype;
3617         struct kvec rsp_iov;
3618         int flags = 0;
3619         unsigned int total_len;
3620
3621         *nbytes = 0;
3622
3623         if (n_vec < 1)
3624                 return rc;
3625
3626         rc = smb2_plain_req_init(SMB2_WRITE, io_parms->tcon, (void **) &req,
3627                              &total_len);
3628         if (rc)
3629                 return rc;
3630
3631         if (io_parms->tcon->ses->server == NULL)
3632                 return -ECONNABORTED;
3633
3634         if (smb3_encryption_required(io_parms->tcon))
3635                 flags |= CIFS_TRANSFORM_REQ;
3636
3637         req->sync_hdr.ProcessId = cpu_to_le32(io_parms->pid);
3638
3639         req->PersistentFileId = io_parms->persistent_fid;
3640         req->VolatileFileId = io_parms->volatile_fid;
3641         req->WriteChannelInfoOffset = 0;
3642         req->WriteChannelInfoLength = 0;
3643         req->Channel = 0;
3644         req->Length = cpu_to_le32(io_parms->length);
3645         req->Offset = cpu_to_le64(io_parms->offset);
3646         req->DataOffset = cpu_to_le16(
3647                                 offsetof(struct smb2_write_req, Buffer));
3648         req->RemainingBytes = 0;
3649
3650         iov[0].iov_base = (char *)req;
3651         /* 1 for Buffer */
3652         iov[0].iov_len = total_len - 1;
3653
3654         memset(&rqst, 0, sizeof(struct smb_rqst));
3655         rqst.rq_iov = iov;
3656         rqst.rq_nvec = n_vec + 1;
3657
3658         rc = cifs_send_recv(xid, io_parms->tcon->ses, &rqst,
3659                             &resp_buftype, flags, &rsp_iov);
3660         rsp = (struct smb2_write_rsp *)rsp_iov.iov_base;
3661
3662         if (rc) {
3663                 trace_smb3_write_err(xid, req->PersistentFileId,
3664                                      io_parms->tcon->tid,
3665                                      io_parms->tcon->ses->Suid,
3666                                      io_parms->offset, io_parms->length, rc);
3667                 cifs_stats_fail_inc(io_parms->tcon, SMB2_WRITE_HE);
3668                 cifs_dbg(VFS, "Send error in write = %d\n", rc);
3669         } else {
3670                 *nbytes = le32_to_cpu(rsp->DataLength);
3671                 trace_smb3_write_done(xid, req->PersistentFileId,
3672                                      io_parms->tcon->tid,
3673                                      io_parms->tcon->ses->Suid,
3674                                      io_parms->offset, *nbytes);
3675         }
3676
3677         cifs_small_buf_release(req);
3678         free_rsp_buf(resp_buftype, rsp);
3679         return rc;
3680 }
3681
3682 static unsigned int
3683 num_entries(char *bufstart, char *end_of_buf, char **lastentry, size_t size)
3684 {
3685         int len;
3686         unsigned int entrycount = 0;
3687         unsigned int next_offset = 0;
3688         char *entryptr;
3689         FILE_DIRECTORY_INFO *dir_info;
3690
3691         if (bufstart == NULL)
3692                 return 0;
3693
3694         entryptr = bufstart;
3695
3696         while (1) {
3697                 if (entryptr + next_offset < entryptr ||
3698                     entryptr + next_offset > end_of_buf ||
3699                     entryptr + next_offset + size > end_of_buf) {
3700                         cifs_dbg(VFS, "malformed search entry would overflow\n");
3701                         break;
3702                 }
3703
3704                 entryptr = entryptr + next_offset;
3705                 dir_info = (FILE_DIRECTORY_INFO *)entryptr;
3706
3707                 len = le32_to_cpu(dir_info->FileNameLength);
3708                 if (entryptr + len < entryptr ||
3709                     entryptr + len > end_of_buf ||
3710                     entryptr + len + size > end_of_buf) {
3711                         cifs_dbg(VFS, "directory entry name would overflow frame end of buf %p\n",
3712                                  end_of_buf);
3713                         break;
3714                 }
3715
3716                 *lastentry = entryptr;
3717                 entrycount++;
3718
3719                 next_offset = le32_to_cpu(dir_info->NextEntryOffset);
3720                 if (!next_offset)
3721                         break;
3722         }
3723
3724         return entrycount;
3725 }
3726
3727 /*
3728  * Readdir/FindFirst
3729  */
3730 int
3731 SMB2_query_directory(const unsigned int xid, struct cifs_tcon *tcon,
3732                      u64 persistent_fid, u64 volatile_fid, int index,
3733                      struct cifs_search_info *srch_inf)
3734 {
3735         struct smb_rqst rqst;
3736         struct smb2_query_directory_req *req;
3737         struct smb2_query_directory_rsp *rsp = NULL;
3738         struct kvec iov[2];
3739         struct kvec rsp_iov;
3740         int rc = 0;
3741         int len;
3742         int resp_buftype = CIFS_NO_BUFFER;
3743         unsigned char *bufptr;
3744         struct TCP_Server_Info *server;
3745         struct cifs_ses *ses = tcon->ses;
3746         __le16 asteriks = cpu_to_le16('*');
3747         char *end_of_smb;
3748         unsigned int output_size = CIFSMaxBufSize;
3749         size_t info_buf_size;
3750         int flags = 0;
3751         unsigned int total_len;
3752
3753         if (ses && (ses->server))
3754                 server = ses->server;
3755         else
3756                 return -EIO;
3757
3758         rc = smb2_plain_req_init(SMB2_QUERY_DIRECTORY, tcon, (void **) &req,
3759                              &total_len);
3760         if (rc)
3761                 return rc;
3762
3763         if (smb3_encryption_required(tcon))
3764                 flags |= CIFS_TRANSFORM_REQ;
3765
3766         switch (srch_inf->info_level) {
3767         case SMB_FIND_FILE_DIRECTORY_INFO:
3768                 req->FileInformationClass = FILE_DIRECTORY_INFORMATION;
3769                 info_buf_size = sizeof(FILE_DIRECTORY_INFO) - 1;
3770                 break;
3771         case SMB_FIND_FILE_ID_FULL_DIR_INFO:
3772                 req->FileInformationClass = FILEID_FULL_DIRECTORY_INFORMATION;
3773                 info_buf_size = sizeof(SEARCH_ID_FULL_DIR_INFO) - 1;
3774                 break;
3775         default:
3776                 cifs_dbg(VFS, "info level %u isn't supported\n",
3777                          srch_inf->info_level);
3778                 rc = -EINVAL;
3779                 goto qdir_exit;
3780         }
3781
3782         req->FileIndex = cpu_to_le32(index);
3783         req->PersistentFileId = persistent_fid;
3784         req->VolatileFileId = volatile_fid;
3785
3786         len = 0x2;
3787         bufptr = req->Buffer;
3788         memcpy(bufptr, &asteriks, len);
3789
3790         req->FileNameOffset =
3791                 cpu_to_le16(sizeof(struct smb2_query_directory_req) - 1);
3792         req->FileNameLength = cpu_to_le16(len);
3793         /*
3794          * BB could be 30 bytes or so longer if we used SMB2 specific
3795          * buffer lengths, but this is safe and close enough.
3796          */
3797         output_size = min_t(unsigned int, output_size, server->maxBuf);
3798         output_size = min_t(unsigned int, output_size, 2 << 15);
3799         req->OutputBufferLength = cpu_to_le32(output_size);
3800
3801         iov[0].iov_base = (char *)req;
3802         /* 1 for Buffer */
3803         iov[0].iov_len = total_len - 1;
3804
3805         iov[1].iov_base = (char *)(req->Buffer);
3806         iov[1].iov_len = len;
3807
3808         memset(&rqst, 0, sizeof(struct smb_rqst));
3809         rqst.rq_iov = iov;
3810         rqst.rq_nvec = 2;
3811
3812         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
3813         cifs_small_buf_release(req);
3814         rsp = (struct smb2_query_directory_rsp *)rsp_iov.iov_base;
3815
3816         if (rc) {
3817                 if (rc == -ENODATA &&
3818                     rsp->sync_hdr.Status == STATUS_NO_MORE_FILES) {
3819                         srch_inf->endOfSearch = true;
3820                         rc = 0;
3821                 } else
3822                         cifs_stats_fail_inc(tcon, SMB2_QUERY_DIRECTORY_HE);
3823                 goto qdir_exit;
3824         }
3825
3826         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
3827                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
3828                                info_buf_size);
3829         if (rc)
3830                 goto qdir_exit;
3831
3832         srch_inf->unicode = true;
3833
3834         if (srch_inf->ntwrk_buf_start) {
3835                 if (srch_inf->smallBuf)
3836                         cifs_small_buf_release(srch_inf->ntwrk_buf_start);
3837                 else
3838                         cifs_buf_release(srch_inf->ntwrk_buf_start);
3839         }
3840         srch_inf->ntwrk_buf_start = (char *)rsp;
3841         srch_inf->srch_entries_start = srch_inf->last_entry =
3842                 (char *)rsp + le16_to_cpu(rsp->OutputBufferOffset);
3843         end_of_smb = rsp_iov.iov_len + (char *)rsp;
3844         srch_inf->entries_in_buffer =
3845                         num_entries(srch_inf->srch_entries_start, end_of_smb,
3846                                     &srch_inf->last_entry, info_buf_size);
3847         srch_inf->index_of_last_entry += srch_inf->entries_in_buffer;
3848         cifs_dbg(FYI, "num entries %d last_index %lld srch start %p srch end %p\n",
3849                  srch_inf->entries_in_buffer, srch_inf->index_of_last_entry,
3850                  srch_inf->srch_entries_start, srch_inf->last_entry);
3851         if (resp_buftype == CIFS_LARGE_BUFFER)
3852                 srch_inf->smallBuf = false;
3853         else if (resp_buftype == CIFS_SMALL_BUFFER)
3854                 srch_inf->smallBuf = true;
3855         else
3856                 cifs_dbg(VFS, "illegal search buffer type\n");
3857
3858         return rc;
3859
3860 qdir_exit:
3861         free_rsp_buf(resp_buftype, rsp);
3862         return rc;
3863 }
3864
3865 static int
3866 send_set_info(const unsigned int xid, struct cifs_tcon *tcon,
3867                u64 persistent_fid, u64 volatile_fid, u32 pid, u8 info_class,
3868                u8 info_type, u32 additional_info, unsigned int num,
3869                 void **data, unsigned int *size)
3870 {
3871         struct smb_rqst rqst;
3872         struct smb2_set_info_req *req;
3873         struct smb2_set_info_rsp *rsp = NULL;
3874         struct kvec *iov;
3875         struct kvec rsp_iov;
3876         int rc = 0;
3877         int resp_buftype;
3878         unsigned int i;
3879         struct cifs_ses *ses = tcon->ses;
3880         int flags = 0;
3881         unsigned int total_len;
3882
3883         if (!ses || !(ses->server))
3884                 return -EIO;
3885
3886         if (!num)
3887                 return -EINVAL;
3888
3889         iov = kmalloc_array(num, sizeof(struct kvec), GFP_KERNEL);
3890         if (!iov)
3891                 return -ENOMEM;
3892
3893         rc = smb2_plain_req_init(SMB2_SET_INFO, tcon, (void **) &req, &total_len);
3894         if (rc) {
3895                 kfree(iov);
3896                 return rc;
3897         }
3898
3899         if (smb3_encryption_required(tcon))
3900                 flags |= CIFS_TRANSFORM_REQ;
3901
3902         req->sync_hdr.ProcessId = cpu_to_le32(pid);
3903
3904         req->InfoType = info_type;
3905         req->FileInfoClass = info_class;
3906         req->PersistentFileId = persistent_fid;
3907         req->VolatileFileId = volatile_fid;
3908         req->AdditionalInformation = cpu_to_le32(additional_info);
3909
3910         req->BufferOffset =
3911                         cpu_to_le16(sizeof(struct smb2_set_info_req) - 1);
3912         req->BufferLength = cpu_to_le32(*size);
3913
3914         memcpy(req->Buffer, *data, *size);
3915         total_len += *size;
3916
3917         iov[0].iov_base = (char *)req;
3918         /* 1 for Buffer */
3919         iov[0].iov_len = total_len - 1;
3920
3921         for (i = 1; i < num; i++) {
3922                 le32_add_cpu(&req->BufferLength, size[i]);
3923                 iov[i].iov_base = (char *)data[i];
3924                 iov[i].iov_len = size[i];
3925         }
3926
3927         memset(&rqst, 0, sizeof(struct smb_rqst));
3928         rqst.rq_iov = iov;
3929         rqst.rq_nvec = num;
3930
3931         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags,
3932                             &rsp_iov);
3933         cifs_buf_release(req);
3934         rsp = (struct smb2_set_info_rsp *)rsp_iov.iov_base;
3935
3936         if (rc != 0) {
3937                 cifs_stats_fail_inc(tcon, SMB2_SET_INFO_HE);
3938                 trace_smb3_set_info_err(xid, persistent_fid, tcon->tid,
3939                                 ses->Suid, info_class, (__u32)info_type, rc);
3940         }
3941
3942         free_rsp_buf(resp_buftype, rsp);
3943         kfree(iov);
3944         return rc;
3945 }
3946
3947 int
3948 SMB2_rename(const unsigned int xid, struct cifs_tcon *tcon,
3949             u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3950 {
3951         struct smb2_file_rename_info info;
3952         void **data;
3953         unsigned int size[2];
3954         int rc;
3955         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
3956
3957         data = kmalloc_array(2, sizeof(void *), GFP_KERNEL);
3958         if (!data)
3959                 return -ENOMEM;
3960
3961         info.ReplaceIfExists = 1; /* 1 = replace existing target with new */
3962                               /* 0 = fail if target already exists */
3963         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
3964         info.FileNameLength = cpu_to_le32(len);
3965
3966         data[0] = &info;
3967         size[0] = sizeof(struct smb2_file_rename_info);
3968
3969         data[1] = target_file;
3970         size[1] = len + 2 /* null */;
3971
3972         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
3973                 current->tgid, FILE_RENAME_INFORMATION, SMB2_O_INFO_FILE,
3974                 0, 2, data, size);
3975         kfree(data);
3976         return rc;
3977 }
3978
3979 int
3980 SMB2_rmdir(const unsigned int xid, struct cifs_tcon *tcon,
3981                   u64 persistent_fid, u64 volatile_fid)
3982 {
3983         __u8 delete_pending = 1;
3984         void *data;
3985         unsigned int size;
3986
3987         data = &delete_pending;
3988         size = 1; /* sizeof __u8 */
3989
3990         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
3991                 current->tgid, FILE_DISPOSITION_INFORMATION, SMB2_O_INFO_FILE,
3992                 0, 1, &data, &size);
3993 }
3994
3995 int
3996 SMB2_set_hardlink(const unsigned int xid, struct cifs_tcon *tcon,
3997                   u64 persistent_fid, u64 volatile_fid, __le16 *target_file)
3998 {
3999         struct smb2_file_link_info info;
4000         void **data;
4001         unsigned int size[2];
4002         int rc;
4003         int len = (2 * UniStrnlen((wchar_t *)target_file, PATH_MAX));
4004
4005         data = kmalloc_array(2, sizeof(void *), GFP_KERNEL);
4006         if (!data)
4007                 return -ENOMEM;
4008
4009         info.ReplaceIfExists = 0; /* 1 = replace existing link with new */
4010                               /* 0 = fail if link already exists */
4011         info.RootDirectory = 0;  /* MBZ for network ops (why does spec say?) */
4012         info.FileNameLength = cpu_to_le32(len);
4013
4014         data[0] = &info;
4015         size[0] = sizeof(struct smb2_file_link_info);
4016
4017         data[1] = target_file;
4018         size[1] = len + 2 /* null */;
4019
4020         rc = send_set_info(xid, tcon, persistent_fid, volatile_fid,
4021                         current->tgid, FILE_LINK_INFORMATION, SMB2_O_INFO_FILE,
4022                         0, 2, data, size);
4023         kfree(data);
4024         return rc;
4025 }
4026
4027 int
4028 SMB2_set_eof(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
4029              u64 volatile_fid, u32 pid, __le64 *eof, bool is_falloc)
4030 {
4031         struct smb2_file_eof_info info;
4032         void *data;
4033         unsigned int size;
4034
4035         info.EndOfFile = *eof;
4036
4037         data = &info;
4038         size = sizeof(struct smb2_file_eof_info);
4039
4040         if (is_falloc)
4041                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4042                         pid, FILE_ALLOCATION_INFORMATION, SMB2_O_INFO_FILE,
4043                         0, 1, &data, &size);
4044         else
4045                 return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4046                         pid, FILE_END_OF_FILE_INFORMATION, SMB2_O_INFO_FILE,
4047                         0, 1, &data, &size);
4048 }
4049
4050 int
4051 SMB2_set_info(const unsigned int xid, struct cifs_tcon *tcon,
4052               u64 persistent_fid, u64 volatile_fid, FILE_BASIC_INFO *buf)
4053 {
4054         unsigned int size;
4055         size = sizeof(FILE_BASIC_INFO);
4056         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4057                 current->tgid, FILE_BASIC_INFORMATION, SMB2_O_INFO_FILE,
4058                 0, 1, (void **)&buf, &size);
4059 }
4060
4061 int
4062 SMB2_set_acl(const unsigned int xid, struct cifs_tcon *tcon,
4063                 u64 persistent_fid, u64 volatile_fid,
4064                 struct cifs_ntsd *pnntsd, int pacllen, int aclflag)
4065 {
4066         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4067                         current->tgid, 0, SMB2_O_INFO_SECURITY, aclflag,
4068                         1, (void **)&pnntsd, &pacllen);
4069 }
4070
4071 int
4072 SMB2_set_ea(const unsigned int xid, struct cifs_tcon *tcon,
4073             u64 persistent_fid, u64 volatile_fid,
4074             struct smb2_file_full_ea_info *buf, int len)
4075 {
4076         return send_set_info(xid, tcon, persistent_fid, volatile_fid,
4077                 current->tgid, FILE_FULL_EA_INFORMATION, SMB2_O_INFO_FILE,
4078                 0, 1, (void **)&buf, &len);
4079 }
4080
4081 int
4082 SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
4083                   const u64 persistent_fid, const u64 volatile_fid,
4084                   __u8 oplock_level)
4085 {
4086         struct smb_rqst rqst;
4087         int rc;
4088         struct smb2_oplock_break *req = NULL;
4089         struct cifs_ses *ses = tcon->ses;
4090         int flags = CIFS_OBREAK_OP;
4091         unsigned int total_len;
4092         struct kvec iov[1];
4093         struct kvec rsp_iov;
4094         int resp_buf_type;
4095
4096         cifs_dbg(FYI, "SMB2_oplock_break\n");
4097         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4098                              &total_len);
4099         if (rc)
4100                 return rc;
4101
4102         if (smb3_encryption_required(tcon))
4103                 flags |= CIFS_TRANSFORM_REQ;
4104
4105         req->VolatileFid = volatile_fid;
4106         req->PersistentFid = persistent_fid;
4107         req->OplockLevel = oplock_level;
4108         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4109
4110         flags |= CIFS_NO_RESP;
4111
4112         iov[0].iov_base = (char *)req;
4113         iov[0].iov_len = total_len;
4114
4115         memset(&rqst, 0, sizeof(struct smb_rqst));
4116         rqst.rq_iov = iov;
4117         rqst.rq_nvec = 1;
4118
4119         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4120         cifs_small_buf_release(req);
4121
4122         if (rc) {
4123                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4124                 cifs_dbg(FYI, "Send error in Oplock Break = %d\n", rc);
4125         }
4126
4127         return rc;
4128 }
4129
4130 void
4131 smb2_copy_fs_info_to_kstatfs(struct smb2_fs_full_size_info *pfs_inf,
4132                              struct kstatfs *kst)
4133 {
4134         kst->f_bsize = le32_to_cpu(pfs_inf->BytesPerSector) *
4135                           le32_to_cpu(pfs_inf->SectorsPerAllocationUnit);
4136         kst->f_blocks = le64_to_cpu(pfs_inf->TotalAllocationUnits);
4137         kst->f_bfree  = kst->f_bavail =
4138                         le64_to_cpu(pfs_inf->CallerAvailableAllocationUnits);
4139         return;
4140 }
4141
4142 static void
4143 copy_posix_fs_info_to_kstatfs(FILE_SYSTEM_POSIX_INFO *response_data,
4144                         struct kstatfs *kst)
4145 {
4146         kst->f_bsize = le32_to_cpu(response_data->BlockSize);
4147         kst->f_blocks = le64_to_cpu(response_data->TotalBlocks);
4148         kst->f_bfree =  le64_to_cpu(response_data->BlocksAvail);
4149         if (response_data->UserBlocksAvail == cpu_to_le64(-1))
4150                 kst->f_bavail = kst->f_bfree;
4151         else
4152                 kst->f_bavail = le64_to_cpu(response_data->UserBlocksAvail);
4153         if (response_data->TotalFileNodes != cpu_to_le64(-1))
4154                 kst->f_files = le64_to_cpu(response_data->TotalFileNodes);
4155         if (response_data->FreeFileNodes != cpu_to_le64(-1))
4156                 kst->f_ffree = le64_to_cpu(response_data->FreeFileNodes);
4157
4158         return;
4159 }
4160
4161 static int
4162 build_qfs_info_req(struct kvec *iov, struct cifs_tcon *tcon, int level,
4163                    int outbuf_len, u64 persistent_fid, u64 volatile_fid)
4164 {
4165         struct TCP_Server_Info *server;
4166         int rc;
4167         struct smb2_query_info_req *req;
4168         unsigned int total_len;
4169
4170         cifs_dbg(FYI, "Query FSInfo level %d\n", level);
4171
4172         if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
4173                 return -EIO;
4174
4175         server = tcon->ses->server;
4176
4177         rc = smb2_plain_req_init(SMB2_QUERY_INFO, tcon, (void **) &req,
4178                              &total_len);
4179         if (rc)
4180                 return rc;
4181
4182         req->InfoType = SMB2_O_INFO_FILESYSTEM;
4183         req->FileInfoClass = level;
4184         req->PersistentFileId = persistent_fid;
4185         req->VolatileFileId = volatile_fid;
4186         /* 1 for pad */
4187         req->InputBufferOffset =
4188                         cpu_to_le16(sizeof(struct smb2_query_info_req) - 1);
4189         req->OutputBufferLength = cpu_to_le32(
4190                 outbuf_len + sizeof(struct smb2_query_info_rsp) - 1);
4191
4192         iov->iov_base = (char *)req;
4193         iov->iov_len = total_len;
4194         return 0;
4195 }
4196
4197 int
4198 SMB311_posix_qfs_info(const unsigned int xid, struct cifs_tcon *tcon,
4199               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4200 {
4201         struct smb_rqst rqst;
4202         struct smb2_query_info_rsp *rsp = NULL;
4203         struct kvec iov;
4204         struct kvec rsp_iov;
4205         int rc = 0;
4206         int resp_buftype;
4207         struct cifs_ses *ses = tcon->ses;
4208         FILE_SYSTEM_POSIX_INFO *info = NULL;
4209         int flags = 0;
4210
4211         rc = build_qfs_info_req(&iov, tcon, FS_POSIX_INFORMATION,
4212                                 sizeof(FILE_SYSTEM_POSIX_INFO),
4213                                 persistent_fid, volatile_fid);
4214         if (rc)
4215                 return rc;
4216
4217         if (smb3_encryption_required(tcon))
4218                 flags |= CIFS_TRANSFORM_REQ;
4219
4220         memset(&rqst, 0, sizeof(struct smb_rqst));
4221         rqst.rq_iov = &iov;
4222         rqst.rq_nvec = 1;
4223
4224         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4225         cifs_small_buf_release(iov.iov_base);
4226         if (rc) {
4227                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4228                 goto posix_qfsinf_exit;
4229         }
4230         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4231
4232         info = (FILE_SYSTEM_POSIX_INFO *)(
4233                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4234         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4235                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4236                                sizeof(FILE_SYSTEM_POSIX_INFO));
4237         if (!rc)
4238                 copy_posix_fs_info_to_kstatfs(info, fsdata);
4239
4240 posix_qfsinf_exit:
4241         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4242         return rc;
4243 }
4244
4245 int
4246 SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
4247               u64 persistent_fid, u64 volatile_fid, struct kstatfs *fsdata)
4248 {
4249         struct smb_rqst rqst;
4250         struct smb2_query_info_rsp *rsp = NULL;
4251         struct kvec iov;
4252         struct kvec rsp_iov;
4253         int rc = 0;
4254         int resp_buftype;
4255         struct cifs_ses *ses = tcon->ses;
4256         struct smb2_fs_full_size_info *info = NULL;
4257         int flags = 0;
4258
4259         rc = build_qfs_info_req(&iov, tcon, FS_FULL_SIZE_INFORMATION,
4260                                 sizeof(struct smb2_fs_full_size_info),
4261                                 persistent_fid, volatile_fid);
4262         if (rc)
4263                 return rc;
4264
4265         if (smb3_encryption_required(tcon))
4266                 flags |= CIFS_TRANSFORM_REQ;
4267
4268         memset(&rqst, 0, sizeof(struct smb_rqst));
4269         rqst.rq_iov = &iov;
4270         rqst.rq_nvec = 1;
4271
4272         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4273         cifs_small_buf_release(iov.iov_base);
4274         if (rc) {
4275                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4276                 goto qfsinf_exit;
4277         }
4278         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4279
4280         info = (struct smb2_fs_full_size_info *)(
4281                 le16_to_cpu(rsp->OutputBufferOffset) + (char *)rsp);
4282         rc = smb2_validate_iov(le16_to_cpu(rsp->OutputBufferOffset),
4283                                le32_to_cpu(rsp->OutputBufferLength), &rsp_iov,
4284                                sizeof(struct smb2_fs_full_size_info));
4285         if (!rc)
4286                 smb2_copy_fs_info_to_kstatfs(info, fsdata);
4287
4288 qfsinf_exit:
4289         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4290         return rc;
4291 }
4292
4293 int
4294 SMB2_QFS_attr(const unsigned int xid, struct cifs_tcon *tcon,
4295               u64 persistent_fid, u64 volatile_fid, int level)
4296 {
4297         struct smb_rqst rqst;
4298         struct smb2_query_info_rsp *rsp = NULL;
4299         struct kvec iov;
4300         struct kvec rsp_iov;
4301         int rc = 0;
4302         int resp_buftype, max_len, min_len;
4303         struct cifs_ses *ses = tcon->ses;
4304         unsigned int rsp_len, offset;
4305         int flags = 0;
4306
4307         if (level == FS_DEVICE_INFORMATION) {
4308                 max_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4309                 min_len = sizeof(FILE_SYSTEM_DEVICE_INFO);
4310         } else if (level == FS_ATTRIBUTE_INFORMATION) {
4311                 max_len = sizeof(FILE_SYSTEM_ATTRIBUTE_INFO);
4312                 min_len = MIN_FS_ATTR_INFO_SIZE;
4313         } else if (level == FS_SECTOR_SIZE_INFORMATION) {
4314                 max_len = sizeof(struct smb3_fs_ss_info);
4315                 min_len = sizeof(struct smb3_fs_ss_info);
4316         } else if (level == FS_VOLUME_INFORMATION) {
4317                 max_len = sizeof(struct smb3_fs_vol_info) + MAX_VOL_LABEL_LEN;
4318                 min_len = sizeof(struct smb3_fs_vol_info);
4319         } else {
4320                 cifs_dbg(FYI, "Invalid qfsinfo level %d\n", level);
4321                 return -EINVAL;
4322         }
4323
4324         rc = build_qfs_info_req(&iov, tcon, level, max_len,
4325                                 persistent_fid, volatile_fid);
4326         if (rc)
4327                 return rc;
4328
4329         if (smb3_encryption_required(tcon))
4330                 flags |= CIFS_TRANSFORM_REQ;
4331
4332         memset(&rqst, 0, sizeof(struct smb_rqst));
4333         rqst.rq_iov = &iov;
4334         rqst.rq_nvec = 1;
4335
4336         rc = cifs_send_recv(xid, ses, &rqst, &resp_buftype, flags, &rsp_iov);
4337         cifs_small_buf_release(iov.iov_base);
4338         if (rc) {
4339                 cifs_stats_fail_inc(tcon, SMB2_QUERY_INFO_HE);
4340                 goto qfsattr_exit;
4341         }
4342         rsp = (struct smb2_query_info_rsp *)rsp_iov.iov_base;
4343
4344         rsp_len = le32_to_cpu(rsp->OutputBufferLength);
4345         offset = le16_to_cpu(rsp->OutputBufferOffset);
4346         rc = smb2_validate_iov(offset, rsp_len, &rsp_iov, min_len);
4347         if (rc)
4348                 goto qfsattr_exit;
4349
4350         if (level == FS_ATTRIBUTE_INFORMATION)
4351                 memcpy(&tcon->fsAttrInfo, offset
4352                         + (char *)rsp, min_t(unsigned int,
4353                         rsp_len, max_len));
4354         else if (level == FS_DEVICE_INFORMATION)
4355                 memcpy(&tcon->fsDevInfo, offset
4356                         + (char *)rsp, sizeof(FILE_SYSTEM_DEVICE_INFO));
4357         else if (level == FS_SECTOR_SIZE_INFORMATION) {
4358                 struct smb3_fs_ss_info *ss_info = (struct smb3_fs_ss_info *)
4359                         (offset + (char *)rsp);
4360                 tcon->ss_flags = le32_to_cpu(ss_info->Flags);
4361                 tcon->perf_sector_size =
4362                         le32_to_cpu(ss_info->PhysicalBytesPerSectorForPerf);
4363         } else if (level == FS_VOLUME_INFORMATION) {
4364                 struct smb3_fs_vol_info *vol_info = (struct smb3_fs_vol_info *)
4365                         (offset + (char *)rsp);
4366                 tcon->vol_serial_number = vol_info->VolumeSerialNumber;
4367                 tcon->vol_create_time = vol_info->VolumeCreationTime;
4368         }
4369
4370 qfsattr_exit:
4371         free_rsp_buf(resp_buftype, rsp_iov.iov_base);
4372         return rc;
4373 }
4374
4375 int
4376 smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
4377            const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4378            const __u32 num_lock, struct smb2_lock_element *buf)
4379 {
4380         struct smb_rqst rqst;
4381         int rc = 0;
4382         struct smb2_lock_req *req = NULL;
4383         struct kvec iov[2];
4384         struct kvec rsp_iov;
4385         int resp_buf_type;
4386         unsigned int count;
4387         int flags = CIFS_NO_RESP;
4388         unsigned int total_len;
4389
4390         cifs_dbg(FYI, "smb2_lockv num lock %d\n", num_lock);
4391
4392         rc = smb2_plain_req_init(SMB2_LOCK, tcon, (void **) &req, &total_len);
4393         if (rc)
4394                 return rc;
4395
4396         if (smb3_encryption_required(tcon))
4397                 flags |= CIFS_TRANSFORM_REQ;
4398
4399         req->sync_hdr.ProcessId = cpu_to_le32(pid);
4400         req->LockCount = cpu_to_le16(num_lock);
4401
4402         req->PersistentFileId = persist_fid;
4403         req->VolatileFileId = volatile_fid;
4404
4405         count = num_lock * sizeof(struct smb2_lock_element);
4406
4407         iov[0].iov_base = (char *)req;
4408         iov[0].iov_len = total_len - sizeof(struct smb2_lock_element);
4409         iov[1].iov_base = (char *)buf;
4410         iov[1].iov_len = count;
4411
4412         cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
4413
4414         memset(&rqst, 0, sizeof(struct smb_rqst));
4415         rqst.rq_iov = iov;
4416         rqst.rq_nvec = 2;
4417
4418         rc = cifs_send_recv(xid, tcon->ses, &rqst, &resp_buf_type, flags,
4419                             &rsp_iov);
4420         cifs_small_buf_release(req);
4421         if (rc) {
4422                 cifs_dbg(FYI, "Send error in smb2_lockv = %d\n", rc);
4423                 cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
4424                 trace_smb3_lock_err(xid, persist_fid, tcon->tid,
4425                                     tcon->ses->Suid, rc);
4426         }
4427
4428         return rc;
4429 }
4430
4431 int
4432 SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
4433           const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
4434           const __u64 length, const __u64 offset, const __u32 lock_flags,
4435           const bool wait)
4436 {
4437         struct smb2_lock_element lock;
4438
4439         lock.Offset = cpu_to_le64(offset);
4440         lock.Length = cpu_to_le64(length);
4441         lock.Flags = cpu_to_le32(lock_flags);
4442         if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
4443                 lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
4444
4445         return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
4446 }
4447
4448 int
4449 SMB2_lease_break(const unsigned int xid, struct cifs_tcon *tcon,
4450                  __u8 *lease_key, const __le32 lease_state)
4451 {
4452         struct smb_rqst rqst;
4453         int rc;
4454         struct smb2_lease_ack *req = NULL;
4455         struct cifs_ses *ses = tcon->ses;
4456         int flags = CIFS_OBREAK_OP;
4457         unsigned int total_len;
4458         struct kvec iov[1];
4459         struct kvec rsp_iov;
4460         int resp_buf_type;
4461
4462         cifs_dbg(FYI, "SMB2_lease_break\n");
4463         rc = smb2_plain_req_init(SMB2_OPLOCK_BREAK, tcon, (void **) &req,
4464                              &total_len);
4465         if (rc)
4466                 return rc;
4467
4468         if (smb3_encryption_required(tcon))
4469                 flags |= CIFS_TRANSFORM_REQ;
4470
4471         req->sync_hdr.CreditRequest = cpu_to_le16(1);
4472         req->StructureSize = cpu_to_le16(36);
4473         total_len += 12;
4474
4475         memcpy(req->LeaseKey, lease_key, 16);
4476         req->LeaseState = lease_state;
4477
4478         flags |= CIFS_NO_RESP;
4479
4480         iov[0].iov_base = (char *)req;
4481         iov[0].iov_len = total_len;
4482
4483         memset(&rqst, 0, sizeof(struct smb_rqst));
4484         rqst.rq_iov = iov;
4485         rqst.rq_nvec = 1;
4486
4487         rc = cifs_send_recv(xid, ses, &rqst, &resp_buf_type, flags, &rsp_iov);
4488         cifs_small_buf_release(req);
4489
4490         if (rc) {
4491                 cifs_stats_fail_inc(tcon, SMB2_OPLOCK_BREAK_HE);
4492                 cifs_dbg(FYI, "Send error in Lease Break = %d\n", rc);
4493         }
4494
4495         return rc;
4496 }